xref: /openbmc/linux/drivers/usb/typec/tcpm/tcpm.c (revision d967f6ae)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright 2015-2017 Google, Inc
4  *
5  * USB Power Delivery protocol stack.
6  */
7 
8 #include <linux/completion.h>
9 #include <linux/debugfs.h>
10 #include <linux/device.h>
11 #include <linux/hrtimer.h>
12 #include <linux/jiffies.h>
13 #include <linux/kernel.h>
14 #include <linux/kthread.h>
15 #include <linux/module.h>
16 #include <linux/mutex.h>
17 #include <linux/power_supply.h>
18 #include <linux/proc_fs.h>
19 #include <linux/property.h>
20 #include <linux/sched/clock.h>
21 #include <linux/seq_file.h>
22 #include <linux/slab.h>
23 #include <linux/spinlock.h>
24 #include <linux/usb.h>
25 #include <linux/usb/pd.h>
26 #include <linux/usb/pd_ado.h>
27 #include <linux/usb/pd_bdo.h>
28 #include <linux/usb/pd_ext_sdb.h>
29 #include <linux/usb/pd_vdo.h>
30 #include <linux/usb/role.h>
31 #include <linux/usb/tcpm.h>
32 #include <linux/usb/typec_altmode.h>
33 
34 #include <uapi/linux/sched/types.h>
35 
36 #define FOREACH_STATE(S)			\
37 	S(INVALID_STATE),			\
38 	S(TOGGLING),			\
39 	S(CHECK_CONTAMINANT),			\
40 	S(SRC_UNATTACHED),			\
41 	S(SRC_ATTACH_WAIT),			\
42 	S(SRC_ATTACHED),			\
43 	S(SRC_STARTUP),				\
44 	S(SRC_SEND_CAPABILITIES),		\
45 	S(SRC_SEND_CAPABILITIES_TIMEOUT),	\
46 	S(SRC_NEGOTIATE_CAPABILITIES),		\
47 	S(SRC_TRANSITION_SUPPLY),		\
48 	S(SRC_READY),				\
49 	S(SRC_WAIT_NEW_CAPABILITIES),		\
50 						\
51 	S(SNK_UNATTACHED),			\
52 	S(SNK_ATTACH_WAIT),			\
53 	S(SNK_DEBOUNCED),			\
54 	S(SNK_ATTACHED),			\
55 	S(SNK_STARTUP),				\
56 	S(SNK_DISCOVERY),			\
57 	S(SNK_DISCOVERY_DEBOUNCE),		\
58 	S(SNK_DISCOVERY_DEBOUNCE_DONE),		\
59 	S(SNK_WAIT_CAPABILITIES),		\
60 	S(SNK_NEGOTIATE_CAPABILITIES),		\
61 	S(SNK_NEGOTIATE_PPS_CAPABILITIES),	\
62 	S(SNK_TRANSITION_SINK),			\
63 	S(SNK_TRANSITION_SINK_VBUS),		\
64 	S(SNK_READY),				\
65 						\
66 	S(ACC_UNATTACHED),			\
67 	S(DEBUG_ACC_ATTACHED),			\
68 	S(AUDIO_ACC_ATTACHED),			\
69 	S(AUDIO_ACC_DEBOUNCE),			\
70 						\
71 	S(HARD_RESET_SEND),			\
72 	S(HARD_RESET_START),			\
73 	S(SRC_HARD_RESET_VBUS_OFF),		\
74 	S(SRC_HARD_RESET_VBUS_ON),		\
75 	S(SNK_HARD_RESET_SINK_OFF),		\
76 	S(SNK_HARD_RESET_WAIT_VBUS),		\
77 	S(SNK_HARD_RESET_SINK_ON),		\
78 						\
79 	S(SOFT_RESET),				\
80 	S(SRC_SOFT_RESET_WAIT_SNK_TX),		\
81 	S(SNK_SOFT_RESET),			\
82 	S(SOFT_RESET_SEND),			\
83 						\
84 	S(DR_SWAP_ACCEPT),			\
85 	S(DR_SWAP_SEND),			\
86 	S(DR_SWAP_SEND_TIMEOUT),		\
87 	S(DR_SWAP_CANCEL),			\
88 	S(DR_SWAP_CHANGE_DR),			\
89 						\
90 	S(PR_SWAP_ACCEPT),			\
91 	S(PR_SWAP_SEND),			\
92 	S(PR_SWAP_SEND_TIMEOUT),		\
93 	S(PR_SWAP_CANCEL),			\
94 	S(PR_SWAP_START),			\
95 	S(PR_SWAP_SRC_SNK_TRANSITION_OFF),	\
96 	S(PR_SWAP_SRC_SNK_SOURCE_OFF),		\
97 	S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
98 	S(PR_SWAP_SRC_SNK_SINK_ON),		\
99 	S(PR_SWAP_SNK_SRC_SINK_OFF),		\
100 	S(PR_SWAP_SNK_SRC_SOURCE_ON),		\
101 	S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP),    \
102 						\
103 	S(VCONN_SWAP_ACCEPT),			\
104 	S(VCONN_SWAP_SEND),			\
105 	S(VCONN_SWAP_SEND_TIMEOUT),		\
106 	S(VCONN_SWAP_CANCEL),			\
107 	S(VCONN_SWAP_START),			\
108 	S(VCONN_SWAP_WAIT_FOR_VCONN),		\
109 	S(VCONN_SWAP_TURN_ON_VCONN),		\
110 	S(VCONN_SWAP_TURN_OFF_VCONN),		\
111 						\
112 	S(FR_SWAP_SEND),			\
113 	S(FR_SWAP_SEND_TIMEOUT),		\
114 	S(FR_SWAP_SNK_SRC_TRANSITION_TO_OFF),			\
115 	S(FR_SWAP_SNK_SRC_NEW_SINK_READY),		\
116 	S(FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED),	\
117 	S(FR_SWAP_CANCEL),			\
118 						\
119 	S(SNK_TRY),				\
120 	S(SNK_TRY_WAIT),			\
121 	S(SNK_TRY_WAIT_DEBOUNCE),               \
122 	S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS),    \
123 	S(SRC_TRYWAIT),				\
124 	S(SRC_TRYWAIT_DEBOUNCE),		\
125 	S(SRC_TRYWAIT_UNATTACHED),		\
126 						\
127 	S(SRC_TRY),				\
128 	S(SRC_TRY_WAIT),                        \
129 	S(SRC_TRY_DEBOUNCE),			\
130 	S(SNK_TRYWAIT),				\
131 	S(SNK_TRYWAIT_DEBOUNCE),		\
132 	S(SNK_TRYWAIT_VBUS),			\
133 	S(BIST_RX),				\
134 						\
135 	S(GET_STATUS_SEND),			\
136 	S(GET_STATUS_SEND_TIMEOUT),		\
137 	S(GET_PPS_STATUS_SEND),			\
138 	S(GET_PPS_STATUS_SEND_TIMEOUT),		\
139 						\
140 	S(GET_SINK_CAP),			\
141 	S(GET_SINK_CAP_TIMEOUT),		\
142 						\
143 	S(ERROR_RECOVERY),			\
144 	S(PORT_RESET),				\
145 	S(PORT_RESET_WAIT_OFF),			\
146 						\
147 	S(AMS_START),				\
148 	S(CHUNK_NOT_SUPP)
149 
150 #define FOREACH_AMS(S)				\
151 	S(NONE_AMS),				\
152 	S(POWER_NEGOTIATION),			\
153 	S(GOTOMIN),				\
154 	S(SOFT_RESET_AMS),			\
155 	S(HARD_RESET),				\
156 	S(CABLE_RESET),				\
157 	S(GET_SOURCE_CAPABILITIES),		\
158 	S(GET_SINK_CAPABILITIES),		\
159 	S(POWER_ROLE_SWAP),			\
160 	S(FAST_ROLE_SWAP),			\
161 	S(DATA_ROLE_SWAP),			\
162 	S(VCONN_SWAP),				\
163 	S(SOURCE_ALERT),			\
164 	S(GETTING_SOURCE_EXTENDED_CAPABILITIES),\
165 	S(GETTING_SOURCE_SINK_STATUS),		\
166 	S(GETTING_BATTERY_CAPABILITIES),	\
167 	S(GETTING_BATTERY_STATUS),		\
168 	S(GETTING_MANUFACTURER_INFORMATION),	\
169 	S(SECURITY),				\
170 	S(FIRMWARE_UPDATE),			\
171 	S(DISCOVER_IDENTITY),			\
172 	S(SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY),	\
173 	S(DISCOVER_SVIDS),			\
174 	S(DISCOVER_MODES),			\
175 	S(DFP_TO_UFP_ENTER_MODE),		\
176 	S(DFP_TO_UFP_EXIT_MODE),		\
177 	S(DFP_TO_CABLE_PLUG_ENTER_MODE),	\
178 	S(DFP_TO_CABLE_PLUG_EXIT_MODE),		\
179 	S(ATTENTION),				\
180 	S(BIST),				\
181 	S(UNSTRUCTURED_VDMS),			\
182 	S(STRUCTURED_VDMS),			\
183 	S(COUNTRY_INFO),			\
184 	S(COUNTRY_CODES)
185 
186 #define GENERATE_ENUM(e)	e
187 #define GENERATE_STRING(s)	#s
188 
189 enum tcpm_state {
190 	FOREACH_STATE(GENERATE_ENUM)
191 };
192 
193 static const char * const tcpm_states[] = {
194 	FOREACH_STATE(GENERATE_STRING)
195 };
196 
197 enum tcpm_ams {
198 	FOREACH_AMS(GENERATE_ENUM)
199 };
200 
201 static const char * const tcpm_ams_str[] = {
202 	FOREACH_AMS(GENERATE_STRING)
203 };
204 
205 enum vdm_states {
206 	VDM_STATE_ERR_BUSY = -3,
207 	VDM_STATE_ERR_SEND = -2,
208 	VDM_STATE_ERR_TMOUT = -1,
209 	VDM_STATE_DONE = 0,
210 	/* Anything >0 represents an active state */
211 	VDM_STATE_READY = 1,
212 	VDM_STATE_BUSY = 2,
213 	VDM_STATE_WAIT_RSP_BUSY = 3,
214 	VDM_STATE_SEND_MESSAGE = 4,
215 };
216 
217 enum pd_msg_request {
218 	PD_MSG_NONE = 0,
219 	PD_MSG_CTRL_REJECT,
220 	PD_MSG_CTRL_WAIT,
221 	PD_MSG_CTRL_NOT_SUPP,
222 	PD_MSG_DATA_SINK_CAP,
223 	PD_MSG_DATA_SOURCE_CAP,
224 };
225 
226 enum adev_actions {
227 	ADEV_NONE = 0,
228 	ADEV_NOTIFY_USB_AND_QUEUE_VDM,
229 	ADEV_QUEUE_VDM,
230 	ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL,
231 	ADEV_ATTENTION,
232 };
233 
234 /*
235  * Initial current capability of the new source when vSafe5V is applied during PD3.0 Fast Role Swap.
236  * Based on "Table 6-14 Fixed Supply PDO - Sink" of "USB Power Delivery Specification Revision 3.0,
237  * Version 1.2"
238  */
239 enum frs_typec_current {
240 	FRS_NOT_SUPPORTED,
241 	FRS_DEFAULT_POWER,
242 	FRS_5V_1P5A,
243 	FRS_5V_3A,
244 };
245 
246 /* Events from low level driver */
247 
248 #define TCPM_CC_EVENT		BIT(0)
249 #define TCPM_VBUS_EVENT		BIT(1)
250 #define TCPM_RESET_EVENT	BIT(2)
251 #define TCPM_FRS_EVENT		BIT(3)
252 #define TCPM_SOURCING_VBUS	BIT(4)
253 #define TCPM_PORT_CLEAN		BIT(5)
254 
255 #define LOG_BUFFER_ENTRIES	1024
256 #define LOG_BUFFER_ENTRY_SIZE	128
257 
258 /* Alternate mode support */
259 
260 #define SVID_DISCOVERY_MAX	16
261 #define ALTMODE_DISCOVERY_MAX	(SVID_DISCOVERY_MAX * MODE_DISCOVERY_MAX)
262 
263 #define GET_SINK_CAP_RETRY_MS	100
264 #define SEND_DISCOVER_RETRY_MS	100
265 
266 struct pd_mode_data {
267 	int svid_index;		/* current SVID index		*/
268 	int nsvids;
269 	u16 svids[SVID_DISCOVERY_MAX];
270 	int altmodes;		/* number of alternate modes	*/
271 	struct typec_altmode_desc altmode_desc[ALTMODE_DISCOVERY_MAX];
272 };
273 
274 /*
275  * @min_volt: Actual min voltage at the local port
276  * @req_min_volt: Requested min voltage to the port partner
277  * @max_volt: Actual max voltage at the local port
278  * @req_max_volt: Requested max voltage to the port partner
279  * @max_curr: Actual max current at the local port
280  * @req_max_curr: Requested max current of the port partner
281  * @req_out_volt: Requested output voltage to the port partner
282  * @req_op_curr: Requested operating current to the port partner
283  * @supported: Parter has at least one APDO hence supports PPS
284  * @active: PPS mode is active
285  */
286 struct pd_pps_data {
287 	u32 min_volt;
288 	u32 req_min_volt;
289 	u32 max_volt;
290 	u32 req_max_volt;
291 	u32 max_curr;
292 	u32 req_max_curr;
293 	u32 req_out_volt;
294 	u32 req_op_curr;
295 	bool supported;
296 	bool active;
297 };
298 
299 struct tcpm_port {
300 	struct device *dev;
301 
302 	struct mutex lock;		/* tcpm state machine lock */
303 	struct kthread_worker *wq;
304 
305 	struct typec_capability typec_caps;
306 	struct typec_port *typec_port;
307 
308 	struct tcpc_dev	*tcpc;
309 	struct usb_role_switch *role_sw;
310 
311 	enum typec_role vconn_role;
312 	enum typec_role pwr_role;
313 	enum typec_data_role data_role;
314 	enum typec_pwr_opmode pwr_opmode;
315 
316 	struct usb_pd_identity partner_ident;
317 	struct typec_partner_desc partner_desc;
318 	struct typec_partner *partner;
319 
320 	enum typec_cc_status cc_req;
321 	enum typec_cc_status src_rp;	/* work only if pd_supported == false */
322 
323 	enum typec_cc_status cc1;
324 	enum typec_cc_status cc2;
325 	enum typec_cc_polarity polarity;
326 
327 	bool attached;
328 	bool connected;
329 	bool registered;
330 	bool pd_supported;
331 	enum typec_port_type port_type;
332 
333 	/*
334 	 * Set to true when vbus is greater than VSAFE5V min.
335 	 * Set to false when vbus falls below vSinkDisconnect max threshold.
336 	 */
337 	bool vbus_present;
338 
339 	/*
340 	 * Set to true when vbus is less than VSAFE0V max.
341 	 * Set to false when vbus is greater than VSAFE0V max.
342 	 */
343 	bool vbus_vsafe0v;
344 
345 	bool vbus_never_low;
346 	bool vbus_source;
347 	bool vbus_charge;
348 
349 	/* Set to true when Discover_Identity Command is expected to be sent in Ready states. */
350 	bool send_discover;
351 	bool op_vsafe5v;
352 
353 	int try_role;
354 	int try_snk_count;
355 	int try_src_count;
356 
357 	enum pd_msg_request queued_message;
358 
359 	enum tcpm_state enter_state;
360 	enum tcpm_state prev_state;
361 	enum tcpm_state state;
362 	enum tcpm_state delayed_state;
363 	ktime_t delayed_runtime;
364 	unsigned long delay_ms;
365 
366 	spinlock_t pd_event_lock;
367 	u32 pd_events;
368 
369 	struct kthread_work event_work;
370 	struct hrtimer state_machine_timer;
371 	struct kthread_work state_machine;
372 	struct hrtimer vdm_state_machine_timer;
373 	struct kthread_work vdm_state_machine;
374 	struct hrtimer enable_frs_timer;
375 	struct kthread_work enable_frs;
376 	struct hrtimer send_discover_timer;
377 	struct kthread_work send_discover_work;
378 	bool state_machine_running;
379 	/* Set to true when VDM State Machine has following actions. */
380 	bool vdm_sm_running;
381 
382 	struct completion tx_complete;
383 	enum tcpm_transmit_status tx_status;
384 
385 	struct mutex swap_lock;		/* swap command lock */
386 	bool swap_pending;
387 	bool non_pd_role_swap;
388 	struct completion swap_complete;
389 	int swap_status;
390 
391 	unsigned int negotiated_rev;
392 	unsigned int message_id;
393 	unsigned int caps_count;
394 	unsigned int hard_reset_count;
395 	bool pd_capable;
396 	bool explicit_contract;
397 	unsigned int rx_msgid;
398 
399 	/* USB PD objects */
400 	struct usb_power_delivery *pd;
401 	struct usb_power_delivery_capabilities *port_source_caps;
402 	struct usb_power_delivery_capabilities *port_sink_caps;
403 	struct usb_power_delivery *partner_pd;
404 	struct usb_power_delivery_capabilities *partner_source_caps;
405 	struct usb_power_delivery_capabilities *partner_sink_caps;
406 
407 	/* Partner capabilities/requests */
408 	u32 sink_request;
409 	u32 source_caps[PDO_MAX_OBJECTS];
410 	unsigned int nr_source_caps;
411 	u32 sink_caps[PDO_MAX_OBJECTS];
412 	unsigned int nr_sink_caps;
413 
414 	/* Local capabilities */
415 	u32 src_pdo[PDO_MAX_OBJECTS];
416 	unsigned int nr_src_pdo;
417 	u32 snk_pdo[PDO_MAX_OBJECTS];
418 	unsigned int nr_snk_pdo;
419 	u32 snk_vdo_v1[VDO_MAX_OBJECTS];
420 	unsigned int nr_snk_vdo_v1;
421 	u32 snk_vdo[VDO_MAX_OBJECTS];
422 	unsigned int nr_snk_vdo;
423 
424 	unsigned int operating_snk_mw;
425 	bool update_sink_caps;
426 
427 	/* Requested current / voltage to the port partner */
428 	u32 req_current_limit;
429 	u32 req_supply_voltage;
430 	/* Actual current / voltage limit of the local port */
431 	u32 current_limit;
432 	u32 supply_voltage;
433 
434 	/* Used to export TA voltage and current */
435 	struct power_supply *psy;
436 	struct power_supply_desc psy_desc;
437 	enum power_supply_usb_type usb_type;
438 
439 	u32 bist_request;
440 
441 	/* PD state for Vendor Defined Messages */
442 	enum vdm_states vdm_state;
443 	u32 vdm_retries;
444 	/* next Vendor Defined Message to send */
445 	u32 vdo_data[VDO_MAX_SIZE];
446 	u8 vdo_count;
447 	/* VDO to retry if UFP responder replied busy */
448 	u32 vdo_retry;
449 
450 	/* PPS */
451 	struct pd_pps_data pps_data;
452 	struct completion pps_complete;
453 	bool pps_pending;
454 	int pps_status;
455 
456 	/* Alternate mode data */
457 	struct pd_mode_data mode_data;
458 	struct typec_altmode *partner_altmode[ALTMODE_DISCOVERY_MAX];
459 	struct typec_altmode *port_altmode[ALTMODE_DISCOVERY_MAX];
460 
461 	/* Deadline in jiffies to exit src_try_wait state */
462 	unsigned long max_wait;
463 
464 	/* port belongs to a self powered device */
465 	bool self_powered;
466 
467 	/* Sink FRS */
468 	enum frs_typec_current new_source_frs_current;
469 
470 	/* Sink caps have been queried */
471 	bool sink_cap_done;
472 
473 	/* Collision Avoidance and Atomic Message Sequence */
474 	enum tcpm_state upcoming_state;
475 	enum tcpm_ams ams;
476 	enum tcpm_ams next_ams;
477 	bool in_ams;
478 
479 	/* Auto vbus discharge status */
480 	bool auto_vbus_discharge_enabled;
481 
482 	/*
483 	 * When set, port requests PD_P_SNK_STDBY_MW upon entering SNK_DISCOVERY and
484 	 * the actual current limit after RX of PD_CTRL_PSRDY for PD link,
485 	 * SNK_READY for non-pd link.
486 	 */
487 	bool slow_charger_loop;
488 
489 	/*
490 	 * When true indicates that the lower level drivers indicate potential presence
491 	 * of contaminant in the connector pins based on the tcpm state machine
492 	 * transitions.
493 	 */
494 	bool potential_contaminant;
495 #ifdef CONFIG_DEBUG_FS
496 	struct dentry *dentry;
497 	struct mutex logbuffer_lock;	/* log buffer access lock */
498 	int logbuffer_head;
499 	int logbuffer_tail;
500 	u8 *logbuffer[LOG_BUFFER_ENTRIES];
501 #endif
502 };
503 
504 struct pd_rx_event {
505 	struct kthread_work work;
506 	struct tcpm_port *port;
507 	struct pd_message msg;
508 };
509 
510 static const char * const pd_rev[] = {
511 	[PD_REV10]		= "rev1",
512 	[PD_REV20]		= "rev2",
513 	[PD_REV30]		= "rev3",
514 };
515 
516 #define tcpm_cc_is_sink(cc) \
517 	((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
518 	 (cc) == TYPEC_CC_RP_3_0)
519 
520 #define tcpm_port_is_sink(port) \
521 	((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
522 	 (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
523 
524 #define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
525 #define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
526 #define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
527 
528 #define tcpm_port_is_source(port) \
529 	((tcpm_cc_is_source((port)->cc1) && \
530 	 !tcpm_cc_is_source((port)->cc2)) || \
531 	 (tcpm_cc_is_source((port)->cc2) && \
532 	  !tcpm_cc_is_source((port)->cc1)))
533 
534 #define tcpm_port_is_debug(port) \
535 	(tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
536 
537 #define tcpm_port_is_audio(port) \
538 	(tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
539 
540 #define tcpm_port_is_audio_detached(port) \
541 	((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
542 	 (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
543 
544 #define tcpm_try_snk(port) \
545 	((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \
546 	(port)->port_type == TYPEC_PORT_DRP)
547 
548 #define tcpm_try_src(port) \
549 	((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \
550 	(port)->port_type == TYPEC_PORT_DRP)
551 
552 #define tcpm_data_role_for_source(port) \
553 	((port)->typec_caps.data == TYPEC_PORT_UFP ? \
554 	TYPEC_DEVICE : TYPEC_HOST)
555 
556 #define tcpm_data_role_for_sink(port) \
557 	((port)->typec_caps.data == TYPEC_PORT_DFP ? \
558 	TYPEC_HOST : TYPEC_DEVICE)
559 
560 #define tcpm_sink_tx_ok(port) \
561 	(tcpm_port_is_sink(port) && \
562 	((port)->cc1 == TYPEC_CC_RP_3_0 || (port)->cc2 == TYPEC_CC_RP_3_0))
563 
564 #define tcpm_wait_for_discharge(port) \
565 	(((port)->auto_vbus_discharge_enabled && !(port)->vbus_vsafe0v) ? PD_T_SAFE_0V : 0)
566 
tcpm_default_state(struct tcpm_port * port)567 static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
568 {
569 	if (port->port_type == TYPEC_PORT_DRP) {
570 		if (port->try_role == TYPEC_SINK)
571 			return SNK_UNATTACHED;
572 		else if (port->try_role == TYPEC_SOURCE)
573 			return SRC_UNATTACHED;
574 		/* Fall through to return SRC_UNATTACHED */
575 	} else if (port->port_type == TYPEC_PORT_SNK) {
576 		return SNK_UNATTACHED;
577 	}
578 	return SRC_UNATTACHED;
579 }
580 
tcpm_port_is_disconnected(struct tcpm_port * port)581 static bool tcpm_port_is_disconnected(struct tcpm_port *port)
582 {
583 	return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
584 		port->cc2 == TYPEC_CC_OPEN) ||
585 	       (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
586 				    port->cc1 == TYPEC_CC_OPEN) ||
587 				   (port->polarity == TYPEC_POLARITY_CC2 &&
588 				    port->cc2 == TYPEC_CC_OPEN)));
589 }
590 
591 /*
592  * Logging
593  */
594 
595 #ifdef CONFIG_DEBUG_FS
596 
tcpm_log_full(struct tcpm_port * port)597 static bool tcpm_log_full(struct tcpm_port *port)
598 {
599 	return port->logbuffer_tail ==
600 		(port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
601 }
602 
603 __printf(2, 0)
_tcpm_log(struct tcpm_port * port,const char * fmt,va_list args)604 static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
605 {
606 	char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
607 	u64 ts_nsec = local_clock();
608 	unsigned long rem_nsec;
609 
610 	mutex_lock(&port->logbuffer_lock);
611 	if (!port->logbuffer[port->logbuffer_head]) {
612 		port->logbuffer[port->logbuffer_head] =
613 				kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
614 		if (!port->logbuffer[port->logbuffer_head]) {
615 			mutex_unlock(&port->logbuffer_lock);
616 			return;
617 		}
618 	}
619 
620 	vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
621 
622 	if (tcpm_log_full(port)) {
623 		port->logbuffer_head = max(port->logbuffer_head - 1, 0);
624 		strcpy(tmpbuffer, "overflow");
625 	}
626 
627 	if (port->logbuffer_head < 0 ||
628 	    port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
629 		dev_warn(port->dev,
630 			 "Bad log buffer index %d\n", port->logbuffer_head);
631 		goto abort;
632 	}
633 
634 	if (!port->logbuffer[port->logbuffer_head]) {
635 		dev_warn(port->dev,
636 			 "Log buffer index %d is NULL\n", port->logbuffer_head);
637 		goto abort;
638 	}
639 
640 	rem_nsec = do_div(ts_nsec, 1000000000);
641 	scnprintf(port->logbuffer[port->logbuffer_head],
642 		  LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
643 		  (unsigned long)ts_nsec, rem_nsec / 1000,
644 		  tmpbuffer);
645 	port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
646 
647 abort:
648 	mutex_unlock(&port->logbuffer_lock);
649 }
650 
651 __printf(2, 3)
tcpm_log(struct tcpm_port * port,const char * fmt,...)652 static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
653 {
654 	va_list args;
655 
656 	/* Do not log while disconnected and unattached */
657 	if (tcpm_port_is_disconnected(port) &&
658 	    (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
659 	     port->state == TOGGLING || port->state == CHECK_CONTAMINANT))
660 		return;
661 
662 	va_start(args, fmt);
663 	_tcpm_log(port, fmt, args);
664 	va_end(args);
665 }
666 
667 __printf(2, 3)
tcpm_log_force(struct tcpm_port * port,const char * fmt,...)668 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
669 {
670 	va_list args;
671 
672 	va_start(args, fmt);
673 	_tcpm_log(port, fmt, args);
674 	va_end(args);
675 }
676 
tcpm_log_source_caps(struct tcpm_port * port)677 static void tcpm_log_source_caps(struct tcpm_port *port)
678 {
679 	int i;
680 
681 	for (i = 0; i < port->nr_source_caps; i++) {
682 		u32 pdo = port->source_caps[i];
683 		enum pd_pdo_type type = pdo_type(pdo);
684 		char msg[64];
685 
686 		switch (type) {
687 		case PDO_TYPE_FIXED:
688 			scnprintf(msg, sizeof(msg),
689 				  "%u mV, %u mA [%s%s%s%s%s%s]",
690 				  pdo_fixed_voltage(pdo),
691 				  pdo_max_current(pdo),
692 				  (pdo & PDO_FIXED_DUAL_ROLE) ?
693 							"R" : "",
694 				  (pdo & PDO_FIXED_SUSPEND) ?
695 							"S" : "",
696 				  (pdo & PDO_FIXED_HIGHER_CAP) ?
697 							"H" : "",
698 				  (pdo & PDO_FIXED_USB_COMM) ?
699 							"U" : "",
700 				  (pdo & PDO_FIXED_DATA_SWAP) ?
701 							"D" : "",
702 				  (pdo & PDO_FIXED_EXTPOWER) ?
703 							"E" : "");
704 			break;
705 		case PDO_TYPE_VAR:
706 			scnprintf(msg, sizeof(msg),
707 				  "%u-%u mV, %u mA",
708 				  pdo_min_voltage(pdo),
709 				  pdo_max_voltage(pdo),
710 				  pdo_max_current(pdo));
711 			break;
712 		case PDO_TYPE_BATT:
713 			scnprintf(msg, sizeof(msg),
714 				  "%u-%u mV, %u mW",
715 				  pdo_min_voltage(pdo),
716 				  pdo_max_voltage(pdo),
717 				  pdo_max_power(pdo));
718 			break;
719 		case PDO_TYPE_APDO:
720 			if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
721 				scnprintf(msg, sizeof(msg),
722 					  "%u-%u mV, %u mA",
723 					  pdo_pps_apdo_min_voltage(pdo),
724 					  pdo_pps_apdo_max_voltage(pdo),
725 					  pdo_pps_apdo_max_current(pdo));
726 			else
727 				strcpy(msg, "undefined APDO");
728 			break;
729 		default:
730 			strcpy(msg, "undefined");
731 			break;
732 		}
733 		tcpm_log(port, " PDO %d: type %d, %s",
734 			 i, type, msg);
735 	}
736 }
737 
tcpm_debug_show(struct seq_file * s,void * v)738 static int tcpm_debug_show(struct seq_file *s, void *v)
739 {
740 	struct tcpm_port *port = s->private;
741 	int tail;
742 
743 	mutex_lock(&port->logbuffer_lock);
744 	tail = port->logbuffer_tail;
745 	while (tail != port->logbuffer_head) {
746 		seq_printf(s, "%s\n", port->logbuffer[tail]);
747 		tail = (tail + 1) % LOG_BUFFER_ENTRIES;
748 	}
749 	if (!seq_has_overflowed(s))
750 		port->logbuffer_tail = tail;
751 	mutex_unlock(&port->logbuffer_lock);
752 
753 	return 0;
754 }
755 DEFINE_SHOW_ATTRIBUTE(tcpm_debug);
756 
tcpm_debugfs_init(struct tcpm_port * port)757 static void tcpm_debugfs_init(struct tcpm_port *port)
758 {
759 	char name[NAME_MAX];
760 
761 	mutex_init(&port->logbuffer_lock);
762 	snprintf(name, NAME_MAX, "tcpm-%s", dev_name(port->dev));
763 	port->dentry = debugfs_create_dir(name, usb_debug_root);
764 	debugfs_create_file("log", S_IFREG | 0444, port->dentry, port,
765 			    &tcpm_debug_fops);
766 }
767 
tcpm_debugfs_exit(struct tcpm_port * port)768 static void tcpm_debugfs_exit(struct tcpm_port *port)
769 {
770 	int i;
771 
772 	mutex_lock(&port->logbuffer_lock);
773 	for (i = 0; i < LOG_BUFFER_ENTRIES; i++) {
774 		kfree(port->logbuffer[i]);
775 		port->logbuffer[i] = NULL;
776 	}
777 	mutex_unlock(&port->logbuffer_lock);
778 
779 	debugfs_remove(port->dentry);
780 }
781 
782 #else
783 
784 __printf(2, 3)
tcpm_log(const struct tcpm_port * port,const char * fmt,...)785 static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
786 __printf(2, 3)
tcpm_log_force(struct tcpm_port * port,const char * fmt,...)787 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
tcpm_log_source_caps(struct tcpm_port * port)788 static void tcpm_log_source_caps(struct tcpm_port *port) { }
tcpm_debugfs_init(const struct tcpm_port * port)789 static void tcpm_debugfs_init(const struct tcpm_port *port) { }
tcpm_debugfs_exit(const struct tcpm_port * port)790 static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
791 
792 #endif
793 
tcpm_set_cc(struct tcpm_port * port,enum typec_cc_status cc)794 static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
795 {
796 	tcpm_log(port, "cc:=%d", cc);
797 	port->cc_req = cc;
798 	port->tcpc->set_cc(port->tcpc, cc);
799 }
800 
tcpm_enable_auto_vbus_discharge(struct tcpm_port * port,bool enable)801 static int tcpm_enable_auto_vbus_discharge(struct tcpm_port *port, bool enable)
802 {
803 	int ret = 0;
804 
805 	if (port->tcpc->enable_auto_vbus_discharge) {
806 		ret = port->tcpc->enable_auto_vbus_discharge(port->tcpc, enable);
807 		tcpm_log_force(port, "%s vbus discharge ret:%d", enable ? "enable" : "disable",
808 			       ret);
809 		if (!ret)
810 			port->auto_vbus_discharge_enabled = enable;
811 	}
812 
813 	return ret;
814 }
815 
tcpm_apply_rc(struct tcpm_port * port)816 static void tcpm_apply_rc(struct tcpm_port *port)
817 {
818 	/*
819 	 * TCPCI: Move to APPLY_RC state to prevent disconnect during PR_SWAP
820 	 * when Vbus auto discharge on disconnect is enabled.
821 	 */
822 	if (port->tcpc->enable_auto_vbus_discharge && port->tcpc->apply_rc) {
823 		tcpm_log(port, "Apply_RC");
824 		port->tcpc->apply_rc(port->tcpc, port->cc_req, port->polarity);
825 		tcpm_enable_auto_vbus_discharge(port, false);
826 	}
827 }
828 
829 /*
830  * Determine RP value to set based on maximum current supported
831  * by a port if configured as source.
832  * Returns CC value to report to link partner.
833  */
tcpm_rp_cc(struct tcpm_port * port)834 static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
835 {
836 	const u32 *src_pdo = port->src_pdo;
837 	int nr_pdo = port->nr_src_pdo;
838 	int i;
839 
840 	if (!port->pd_supported)
841 		return port->src_rp;
842 
843 	/*
844 	 * Search for first entry with matching voltage.
845 	 * It should report the maximum supported current.
846 	 */
847 	for (i = 0; i < nr_pdo; i++) {
848 		const u32 pdo = src_pdo[i];
849 
850 		if (pdo_type(pdo) == PDO_TYPE_FIXED &&
851 		    pdo_fixed_voltage(pdo) == 5000) {
852 			unsigned int curr = pdo_max_current(pdo);
853 
854 			if (curr >= 3000)
855 				return TYPEC_CC_RP_3_0;
856 			else if (curr >= 1500)
857 				return TYPEC_CC_RP_1_5;
858 			return TYPEC_CC_RP_DEF;
859 		}
860 	}
861 
862 	return TYPEC_CC_RP_DEF;
863 }
864 
tcpm_ams_finish(struct tcpm_port * port)865 static void tcpm_ams_finish(struct tcpm_port *port)
866 {
867 	tcpm_log(port, "AMS %s finished", tcpm_ams_str[port->ams]);
868 
869 	if (port->pd_capable && port->pwr_role == TYPEC_SOURCE) {
870 		if (port->negotiated_rev >= PD_REV30)
871 			tcpm_set_cc(port, SINK_TX_OK);
872 		else
873 			tcpm_set_cc(port, SINK_TX_NG);
874 	} else if (port->pwr_role == TYPEC_SOURCE) {
875 		tcpm_set_cc(port, tcpm_rp_cc(port));
876 	}
877 
878 	port->in_ams = false;
879 	port->ams = NONE_AMS;
880 }
881 
tcpm_pd_transmit(struct tcpm_port * port,enum tcpm_transmit_type type,const struct pd_message * msg)882 static int tcpm_pd_transmit(struct tcpm_port *port,
883 			    enum tcpm_transmit_type type,
884 			    const struct pd_message *msg)
885 {
886 	unsigned long timeout;
887 	int ret;
888 
889 	if (msg)
890 		tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
891 	else
892 		tcpm_log(port, "PD TX, type: %#x", type);
893 
894 	reinit_completion(&port->tx_complete);
895 	ret = port->tcpc->pd_transmit(port->tcpc, type, msg, port->negotiated_rev);
896 	if (ret < 0)
897 		return ret;
898 
899 	mutex_unlock(&port->lock);
900 	timeout = wait_for_completion_timeout(&port->tx_complete,
901 				msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
902 	mutex_lock(&port->lock);
903 	if (!timeout)
904 		return -ETIMEDOUT;
905 
906 	switch (port->tx_status) {
907 	case TCPC_TX_SUCCESS:
908 		port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
909 		/*
910 		 * USB PD rev 2.0, 8.3.2.2.1:
911 		 * USB PD rev 3.0, 8.3.2.1.3:
912 		 * "... Note that every AMS is Interruptible until the first
913 		 * Message in the sequence has been successfully sent (GoodCRC
914 		 * Message received)."
915 		 */
916 		if (port->ams != NONE_AMS)
917 			port->in_ams = true;
918 		break;
919 	case TCPC_TX_DISCARDED:
920 		ret = -EAGAIN;
921 		break;
922 	case TCPC_TX_FAILED:
923 	default:
924 		ret = -EIO;
925 		break;
926 	}
927 
928 	/* Some AMS don't expect responses. Finish them here. */
929 	if (port->ams == ATTENTION || port->ams == SOURCE_ALERT)
930 		tcpm_ams_finish(port);
931 
932 	return ret;
933 }
934 
tcpm_pd_transmit_complete(struct tcpm_port * port,enum tcpm_transmit_status status)935 void tcpm_pd_transmit_complete(struct tcpm_port *port,
936 			       enum tcpm_transmit_status status)
937 {
938 	tcpm_log(port, "PD TX complete, status: %u", status);
939 	port->tx_status = status;
940 	complete(&port->tx_complete);
941 }
942 EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
943 
tcpm_mux_set(struct tcpm_port * port,int state,enum usb_role usb_role,enum typec_orientation orientation)944 static int tcpm_mux_set(struct tcpm_port *port, int state,
945 			enum usb_role usb_role,
946 			enum typec_orientation orientation)
947 {
948 	int ret;
949 
950 	tcpm_log(port, "Requesting mux state %d, usb-role %d, orientation %d",
951 		 state, usb_role, orientation);
952 
953 	ret = typec_set_orientation(port->typec_port, orientation);
954 	if (ret)
955 		return ret;
956 
957 	if (port->role_sw) {
958 		ret = usb_role_switch_set_role(port->role_sw, usb_role);
959 		if (ret)
960 			return ret;
961 	}
962 
963 	return typec_set_mode(port->typec_port, state);
964 }
965 
tcpm_set_polarity(struct tcpm_port * port,enum typec_cc_polarity polarity)966 static int tcpm_set_polarity(struct tcpm_port *port,
967 			     enum typec_cc_polarity polarity)
968 {
969 	int ret;
970 
971 	tcpm_log(port, "polarity %d", polarity);
972 
973 	ret = port->tcpc->set_polarity(port->tcpc, polarity);
974 	if (ret < 0)
975 		return ret;
976 
977 	port->polarity = polarity;
978 
979 	return 0;
980 }
981 
tcpm_set_vconn(struct tcpm_port * port,bool enable)982 static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
983 {
984 	int ret;
985 
986 	tcpm_log(port, "vconn:=%d", enable);
987 
988 	ret = port->tcpc->set_vconn(port->tcpc, enable);
989 	if (!ret) {
990 		port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
991 		typec_set_vconn_role(port->typec_port, port->vconn_role);
992 	}
993 
994 	return ret;
995 }
996 
tcpm_get_current_limit(struct tcpm_port * port)997 static u32 tcpm_get_current_limit(struct tcpm_port *port)
998 {
999 	enum typec_cc_status cc;
1000 	u32 limit;
1001 
1002 	cc = port->polarity ? port->cc2 : port->cc1;
1003 	switch (cc) {
1004 	case TYPEC_CC_RP_1_5:
1005 		limit = 1500;
1006 		break;
1007 	case TYPEC_CC_RP_3_0:
1008 		limit = 3000;
1009 		break;
1010 	case TYPEC_CC_RP_DEF:
1011 	default:
1012 		if (port->tcpc->get_current_limit)
1013 			limit = port->tcpc->get_current_limit(port->tcpc);
1014 		else
1015 			limit = 0;
1016 		break;
1017 	}
1018 
1019 	return limit;
1020 }
1021 
tcpm_set_current_limit(struct tcpm_port * port,u32 max_ma,u32 mv)1022 static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
1023 {
1024 	int ret = -EOPNOTSUPP;
1025 
1026 	tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
1027 
1028 	port->supply_voltage = mv;
1029 	port->current_limit = max_ma;
1030 	power_supply_changed(port->psy);
1031 
1032 	if (port->tcpc->set_current_limit)
1033 		ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
1034 
1035 	return ret;
1036 }
1037 
tcpm_set_attached_state(struct tcpm_port * port,bool attached)1038 static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
1039 {
1040 	return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
1041 				     port->data_role);
1042 }
1043 
tcpm_set_roles(struct tcpm_port * port,bool attached,enum typec_role role,enum typec_data_role data)1044 static int tcpm_set_roles(struct tcpm_port *port, bool attached,
1045 			  enum typec_role role, enum typec_data_role data)
1046 {
1047 	enum typec_orientation orientation;
1048 	enum usb_role usb_role;
1049 	int ret;
1050 
1051 	if (port->polarity == TYPEC_POLARITY_CC1)
1052 		orientation = TYPEC_ORIENTATION_NORMAL;
1053 	else
1054 		orientation = TYPEC_ORIENTATION_REVERSE;
1055 
1056 	if (port->typec_caps.data == TYPEC_PORT_DRD) {
1057 		if (data == TYPEC_HOST)
1058 			usb_role = USB_ROLE_HOST;
1059 		else
1060 			usb_role = USB_ROLE_DEVICE;
1061 	} else if (port->typec_caps.data == TYPEC_PORT_DFP) {
1062 		if (data == TYPEC_HOST) {
1063 			if (role == TYPEC_SOURCE)
1064 				usb_role = USB_ROLE_HOST;
1065 			else
1066 				usb_role = USB_ROLE_NONE;
1067 		} else {
1068 			return -ENOTSUPP;
1069 		}
1070 	} else {
1071 		if (data == TYPEC_DEVICE) {
1072 			if (role == TYPEC_SINK)
1073 				usb_role = USB_ROLE_DEVICE;
1074 			else
1075 				usb_role = USB_ROLE_NONE;
1076 		} else {
1077 			return -ENOTSUPP;
1078 		}
1079 	}
1080 
1081 	ret = tcpm_mux_set(port, TYPEC_STATE_USB, usb_role, orientation);
1082 	if (ret < 0)
1083 		return ret;
1084 
1085 	ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
1086 	if (ret < 0)
1087 		return ret;
1088 
1089 	port->pwr_role = role;
1090 	port->data_role = data;
1091 	typec_set_data_role(port->typec_port, data);
1092 	typec_set_pwr_role(port->typec_port, role);
1093 
1094 	return 0;
1095 }
1096 
tcpm_set_pwr_role(struct tcpm_port * port,enum typec_role role)1097 static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
1098 {
1099 	int ret;
1100 
1101 	ret = port->tcpc->set_roles(port->tcpc, true, role,
1102 				    port->data_role);
1103 	if (ret < 0)
1104 		return ret;
1105 
1106 	port->pwr_role = role;
1107 	typec_set_pwr_role(port->typec_port, role);
1108 
1109 	return 0;
1110 }
1111 
1112 /*
1113  * Transform the PDO to be compliant to PD rev2.0.
1114  * Return 0 if the PDO type is not defined in PD rev2.0.
1115  * Otherwise, return the converted PDO.
1116  */
tcpm_forge_legacy_pdo(struct tcpm_port * port,u32 pdo,enum typec_role role)1117 static u32 tcpm_forge_legacy_pdo(struct tcpm_port *port, u32 pdo, enum typec_role role)
1118 {
1119 	switch (pdo_type(pdo)) {
1120 	case PDO_TYPE_FIXED:
1121 		if (role == TYPEC_SINK)
1122 			return pdo & ~PDO_FIXED_FRS_CURR_MASK;
1123 		else
1124 			return pdo & ~PDO_FIXED_UNCHUNK_EXT;
1125 	case PDO_TYPE_VAR:
1126 	case PDO_TYPE_BATT:
1127 		return pdo;
1128 	case PDO_TYPE_APDO:
1129 	default:
1130 		return 0;
1131 	}
1132 }
1133 
tcpm_pd_send_source_caps(struct tcpm_port * port)1134 static int tcpm_pd_send_source_caps(struct tcpm_port *port)
1135 {
1136 	struct pd_message msg;
1137 	u32 pdo;
1138 	unsigned int i, nr_pdo = 0;
1139 
1140 	memset(&msg, 0, sizeof(msg));
1141 
1142 	for (i = 0; i < port->nr_src_pdo; i++) {
1143 		if (port->negotiated_rev >= PD_REV30) {
1144 			msg.payload[nr_pdo++] =	cpu_to_le32(port->src_pdo[i]);
1145 		} else {
1146 			pdo = tcpm_forge_legacy_pdo(port, port->src_pdo[i], TYPEC_SOURCE);
1147 			if (pdo)
1148 				msg.payload[nr_pdo++] = cpu_to_le32(pdo);
1149 		}
1150 	}
1151 
1152 	if (!nr_pdo) {
1153 		/* No source capabilities defined, sink only */
1154 		msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
1155 					  port->pwr_role,
1156 					  port->data_role,
1157 					  port->negotiated_rev,
1158 					  port->message_id, 0);
1159 	} else {
1160 		msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
1161 					  port->pwr_role,
1162 					  port->data_role,
1163 					  port->negotiated_rev,
1164 					  port->message_id,
1165 					  nr_pdo);
1166 	}
1167 
1168 	return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1169 }
1170 
tcpm_pd_send_sink_caps(struct tcpm_port * port)1171 static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
1172 {
1173 	struct pd_message msg;
1174 	u32 pdo;
1175 	unsigned int i, nr_pdo = 0;
1176 
1177 	memset(&msg, 0, sizeof(msg));
1178 
1179 	for (i = 0; i < port->nr_snk_pdo; i++) {
1180 		if (port->negotiated_rev >= PD_REV30) {
1181 			msg.payload[nr_pdo++] =	cpu_to_le32(port->snk_pdo[i]);
1182 		} else {
1183 			pdo = tcpm_forge_legacy_pdo(port, port->snk_pdo[i], TYPEC_SINK);
1184 			if (pdo)
1185 				msg.payload[nr_pdo++] = cpu_to_le32(pdo);
1186 		}
1187 	}
1188 
1189 	if (!nr_pdo) {
1190 		/* No sink capabilities defined, source only */
1191 		msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
1192 					  port->pwr_role,
1193 					  port->data_role,
1194 					  port->negotiated_rev,
1195 					  port->message_id, 0);
1196 	} else {
1197 		msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
1198 					  port->pwr_role,
1199 					  port->data_role,
1200 					  port->negotiated_rev,
1201 					  port->message_id,
1202 					  nr_pdo);
1203 	}
1204 
1205 	return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1206 }
1207 
mod_tcpm_delayed_work(struct tcpm_port * port,unsigned int delay_ms)1208 static void mod_tcpm_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1209 {
1210 	if (delay_ms) {
1211 		hrtimer_start(&port->state_machine_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1212 	} else {
1213 		hrtimer_cancel(&port->state_machine_timer);
1214 		kthread_queue_work(port->wq, &port->state_machine);
1215 	}
1216 }
1217 
mod_vdm_delayed_work(struct tcpm_port * port,unsigned int delay_ms)1218 static void mod_vdm_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1219 {
1220 	if (delay_ms) {
1221 		hrtimer_start(&port->vdm_state_machine_timer, ms_to_ktime(delay_ms),
1222 			      HRTIMER_MODE_REL);
1223 	} else {
1224 		hrtimer_cancel(&port->vdm_state_machine_timer);
1225 		kthread_queue_work(port->wq, &port->vdm_state_machine);
1226 	}
1227 }
1228 
mod_enable_frs_delayed_work(struct tcpm_port * port,unsigned int delay_ms)1229 static void mod_enable_frs_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1230 {
1231 	if (delay_ms) {
1232 		hrtimer_start(&port->enable_frs_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1233 	} else {
1234 		hrtimer_cancel(&port->enable_frs_timer);
1235 		kthread_queue_work(port->wq, &port->enable_frs);
1236 	}
1237 }
1238 
mod_send_discover_delayed_work(struct tcpm_port * port,unsigned int delay_ms)1239 static void mod_send_discover_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1240 {
1241 	if (delay_ms) {
1242 		hrtimer_start(&port->send_discover_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1243 	} else {
1244 		hrtimer_cancel(&port->send_discover_timer);
1245 		kthread_queue_work(port->wq, &port->send_discover_work);
1246 	}
1247 }
1248 
tcpm_set_state(struct tcpm_port * port,enum tcpm_state state,unsigned int delay_ms)1249 static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
1250 			   unsigned int delay_ms)
1251 {
1252 	if (delay_ms) {
1253 		tcpm_log(port, "pending state change %s -> %s @ %u ms [%s %s]",
1254 			 tcpm_states[port->state], tcpm_states[state], delay_ms,
1255 			 pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1256 		port->delayed_state = state;
1257 		mod_tcpm_delayed_work(port, delay_ms);
1258 		port->delayed_runtime = ktime_add(ktime_get(), ms_to_ktime(delay_ms));
1259 		port->delay_ms = delay_ms;
1260 	} else {
1261 		tcpm_log(port, "state change %s -> %s [%s %s]",
1262 			 tcpm_states[port->state], tcpm_states[state],
1263 			 pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1264 		port->delayed_state = INVALID_STATE;
1265 		port->prev_state = port->state;
1266 		port->state = state;
1267 		/*
1268 		 * Don't re-queue the state machine work item if we're currently
1269 		 * in the state machine and we're immediately changing states.
1270 		 * tcpm_state_machine_work() will continue running the state
1271 		 * machine.
1272 		 */
1273 		if (!port->state_machine_running)
1274 			mod_tcpm_delayed_work(port, 0);
1275 	}
1276 }
1277 
tcpm_set_state_cond(struct tcpm_port * port,enum tcpm_state state,unsigned int delay_ms)1278 static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
1279 				unsigned int delay_ms)
1280 {
1281 	if (port->enter_state == port->state)
1282 		tcpm_set_state(port, state, delay_ms);
1283 	else
1284 		tcpm_log(port,
1285 			 "skipped %sstate change %s -> %s [%u ms], context state %s [%s %s]",
1286 			 delay_ms ? "delayed " : "",
1287 			 tcpm_states[port->state], tcpm_states[state],
1288 			 delay_ms, tcpm_states[port->enter_state],
1289 			 pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1290 }
1291 
tcpm_queue_message(struct tcpm_port * port,enum pd_msg_request message)1292 static void tcpm_queue_message(struct tcpm_port *port,
1293 			       enum pd_msg_request message)
1294 {
1295 	port->queued_message = message;
1296 	mod_tcpm_delayed_work(port, 0);
1297 }
1298 
tcpm_vdm_ams(struct tcpm_port * port)1299 static bool tcpm_vdm_ams(struct tcpm_port *port)
1300 {
1301 	switch (port->ams) {
1302 	case DISCOVER_IDENTITY:
1303 	case SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY:
1304 	case DISCOVER_SVIDS:
1305 	case DISCOVER_MODES:
1306 	case DFP_TO_UFP_ENTER_MODE:
1307 	case DFP_TO_UFP_EXIT_MODE:
1308 	case DFP_TO_CABLE_PLUG_ENTER_MODE:
1309 	case DFP_TO_CABLE_PLUG_EXIT_MODE:
1310 	case ATTENTION:
1311 	case UNSTRUCTURED_VDMS:
1312 	case STRUCTURED_VDMS:
1313 		break;
1314 	default:
1315 		return false;
1316 	}
1317 
1318 	return true;
1319 }
1320 
tcpm_ams_interruptible(struct tcpm_port * port)1321 static bool tcpm_ams_interruptible(struct tcpm_port *port)
1322 {
1323 	switch (port->ams) {
1324 	/* Interruptible AMS */
1325 	case NONE_AMS:
1326 	case SECURITY:
1327 	case FIRMWARE_UPDATE:
1328 	case DISCOVER_IDENTITY:
1329 	case SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY:
1330 	case DISCOVER_SVIDS:
1331 	case DISCOVER_MODES:
1332 	case DFP_TO_UFP_ENTER_MODE:
1333 	case DFP_TO_UFP_EXIT_MODE:
1334 	case DFP_TO_CABLE_PLUG_ENTER_MODE:
1335 	case DFP_TO_CABLE_PLUG_EXIT_MODE:
1336 	case UNSTRUCTURED_VDMS:
1337 	case STRUCTURED_VDMS:
1338 	case COUNTRY_INFO:
1339 	case COUNTRY_CODES:
1340 		break;
1341 	/* Non-Interruptible AMS */
1342 	default:
1343 		if (port->in_ams)
1344 			return false;
1345 		break;
1346 	}
1347 
1348 	return true;
1349 }
1350 
tcpm_ams_start(struct tcpm_port * port,enum tcpm_ams ams)1351 static int tcpm_ams_start(struct tcpm_port *port, enum tcpm_ams ams)
1352 {
1353 	int ret = 0;
1354 
1355 	tcpm_log(port, "AMS %s start", tcpm_ams_str[ams]);
1356 
1357 	if (!tcpm_ams_interruptible(port) &&
1358 	    !(ams == HARD_RESET || ams == SOFT_RESET_AMS)) {
1359 		port->upcoming_state = INVALID_STATE;
1360 		tcpm_log(port, "AMS %s not interruptible, aborting",
1361 			 tcpm_ams_str[port->ams]);
1362 		return -EAGAIN;
1363 	}
1364 
1365 	if (port->pwr_role == TYPEC_SOURCE) {
1366 		enum typec_cc_status cc_req = port->cc_req;
1367 
1368 		port->ams = ams;
1369 
1370 		if (ams == HARD_RESET) {
1371 			tcpm_set_cc(port, tcpm_rp_cc(port));
1372 			tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
1373 			tcpm_set_state(port, HARD_RESET_START, 0);
1374 			return ret;
1375 		} else if (ams == SOFT_RESET_AMS) {
1376 			if (!port->explicit_contract)
1377 				tcpm_set_cc(port, tcpm_rp_cc(port));
1378 			tcpm_set_state(port, SOFT_RESET_SEND, 0);
1379 			return ret;
1380 		} else if (tcpm_vdm_ams(port)) {
1381 			/* tSinkTx is enforced in vdm_run_state_machine */
1382 			if (port->negotiated_rev >= PD_REV30)
1383 				tcpm_set_cc(port, SINK_TX_NG);
1384 			return ret;
1385 		}
1386 
1387 		if (port->negotiated_rev >= PD_REV30)
1388 			tcpm_set_cc(port, SINK_TX_NG);
1389 
1390 		switch (port->state) {
1391 		case SRC_READY:
1392 		case SRC_STARTUP:
1393 		case SRC_SOFT_RESET_WAIT_SNK_TX:
1394 		case SOFT_RESET:
1395 		case SOFT_RESET_SEND:
1396 			if (port->negotiated_rev >= PD_REV30)
1397 				tcpm_set_state(port, AMS_START,
1398 					       cc_req == SINK_TX_OK ?
1399 					       PD_T_SINK_TX : 0);
1400 			else
1401 				tcpm_set_state(port, AMS_START, 0);
1402 			break;
1403 		default:
1404 			if (port->negotiated_rev >= PD_REV30)
1405 				tcpm_set_state(port, SRC_READY,
1406 					       cc_req == SINK_TX_OK ?
1407 					       PD_T_SINK_TX : 0);
1408 			else
1409 				tcpm_set_state(port, SRC_READY, 0);
1410 			break;
1411 		}
1412 	} else {
1413 		if (port->negotiated_rev >= PD_REV30 &&
1414 		    !tcpm_sink_tx_ok(port) &&
1415 		    ams != SOFT_RESET_AMS &&
1416 		    ams != HARD_RESET) {
1417 			port->upcoming_state = INVALID_STATE;
1418 			tcpm_log(port, "Sink TX No Go");
1419 			return -EAGAIN;
1420 		}
1421 
1422 		port->ams = ams;
1423 
1424 		if (ams == HARD_RESET) {
1425 			tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
1426 			tcpm_set_state(port, HARD_RESET_START, 0);
1427 			return ret;
1428 		} else if (tcpm_vdm_ams(port)) {
1429 			return ret;
1430 		}
1431 
1432 		if (port->state == SNK_READY ||
1433 		    port->state == SNK_SOFT_RESET)
1434 			tcpm_set_state(port, AMS_START, 0);
1435 		else
1436 			tcpm_set_state(port, SNK_READY, 0);
1437 	}
1438 
1439 	return ret;
1440 }
1441 
1442 /*
1443  * VDM/VDO handling functions
1444  */
tcpm_queue_vdm(struct tcpm_port * port,const u32 header,const u32 * data,int cnt)1445 static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
1446 			   const u32 *data, int cnt)
1447 {
1448 	u32 vdo_hdr = port->vdo_data[0];
1449 
1450 	WARN_ON(!mutex_is_locked(&port->lock));
1451 
1452 	/* If is sending discover_identity, handle received message first */
1453 	if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMD(vdo_hdr) == CMD_DISCOVER_IDENT) {
1454 		port->send_discover = true;
1455 		mod_send_discover_delayed_work(port, SEND_DISCOVER_RETRY_MS);
1456 	} else {
1457 		/* Make sure we are not still processing a previous VDM packet */
1458 		WARN_ON(port->vdm_state > VDM_STATE_DONE);
1459 	}
1460 
1461 	port->vdo_count = cnt + 1;
1462 	port->vdo_data[0] = header;
1463 	memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
1464 	/* Set ready, vdm state machine will actually send */
1465 	port->vdm_retries = 0;
1466 	port->vdm_state = VDM_STATE_READY;
1467 	port->vdm_sm_running = true;
1468 
1469 	mod_vdm_delayed_work(port, 0);
1470 }
1471 
tcpm_queue_vdm_unlocked(struct tcpm_port * port,const u32 header,const u32 * data,int cnt)1472 static void tcpm_queue_vdm_unlocked(struct tcpm_port *port, const u32 header,
1473 				    const u32 *data, int cnt)
1474 {
1475 	mutex_lock(&port->lock);
1476 	tcpm_queue_vdm(port, header, data, cnt);
1477 	mutex_unlock(&port->lock);
1478 }
1479 
svdm_consume_identity(struct tcpm_port * port,const u32 * p,int cnt)1480 static void svdm_consume_identity(struct tcpm_port *port, const u32 *p, int cnt)
1481 {
1482 	u32 vdo = p[VDO_INDEX_IDH];
1483 	u32 product = p[VDO_INDEX_PRODUCT];
1484 
1485 	memset(&port->mode_data, 0, sizeof(port->mode_data));
1486 
1487 	port->partner_ident.id_header = vdo;
1488 	port->partner_ident.cert_stat = p[VDO_INDEX_CSTAT];
1489 	port->partner_ident.product = product;
1490 
1491 	if (port->partner)
1492 		typec_partner_set_identity(port->partner);
1493 
1494 	tcpm_log(port, "Identity: %04x:%04x.%04x",
1495 		 PD_IDH_VID(vdo),
1496 		 PD_PRODUCT_PID(product), product & 0xffff);
1497 }
1498 
svdm_consume_svids(struct tcpm_port * port,const u32 * p,int cnt)1499 static bool svdm_consume_svids(struct tcpm_port *port, const u32 *p, int cnt)
1500 {
1501 	struct pd_mode_data *pmdata = &port->mode_data;
1502 	int i;
1503 
1504 	for (i = 1; i < cnt; i++) {
1505 		u16 svid;
1506 
1507 		svid = (p[i] >> 16) & 0xffff;
1508 		if (!svid)
1509 			return false;
1510 
1511 		if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1512 			goto abort;
1513 
1514 		pmdata->svids[pmdata->nsvids++] = svid;
1515 		tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1516 
1517 		svid = p[i] & 0xffff;
1518 		if (!svid)
1519 			return false;
1520 
1521 		if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1522 			goto abort;
1523 
1524 		pmdata->svids[pmdata->nsvids++] = svid;
1525 		tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1526 	}
1527 
1528 	/*
1529 	 * PD3.0 Spec 6.4.4.3.2: The SVIDs are returned 2 per VDO (see Table
1530 	 * 6-43), and can be returned maximum 6 VDOs per response (see Figure
1531 	 * 6-19). If the Respondersupports 12 or more SVID then the Discover
1532 	 * SVIDs Command Shall be executed multiple times until a Discover
1533 	 * SVIDs VDO is returned ending either with a SVID value of 0x0000 in
1534 	 * the last part of the last VDO or with a VDO containing two SVIDs
1535 	 * with values of 0x0000.
1536 	 *
1537 	 * However, some odd dockers support SVIDs less than 12 but without
1538 	 * 0x0000 in the last VDO, so we need to break the Discover SVIDs
1539 	 * request and return false here.
1540 	 */
1541 	return cnt == 7;
1542 abort:
1543 	tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
1544 	return false;
1545 }
1546 
svdm_consume_modes(struct tcpm_port * port,const u32 * p,int cnt)1547 static void svdm_consume_modes(struct tcpm_port *port, const u32 *p, int cnt)
1548 {
1549 	struct pd_mode_data *pmdata = &port->mode_data;
1550 	struct typec_altmode_desc *paltmode;
1551 	int i;
1552 
1553 	if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
1554 		/* Already logged in svdm_consume_svids() */
1555 		return;
1556 	}
1557 
1558 	for (i = 1; i < cnt; i++) {
1559 		paltmode = &pmdata->altmode_desc[pmdata->altmodes];
1560 		memset(paltmode, 0, sizeof(*paltmode));
1561 
1562 		paltmode->svid = pmdata->svids[pmdata->svid_index];
1563 		paltmode->mode = i;
1564 		paltmode->vdo = p[i];
1565 
1566 		tcpm_log(port, " Alternate mode %d: SVID 0x%04x, VDO %d: 0x%08x",
1567 			 pmdata->altmodes, paltmode->svid,
1568 			 paltmode->mode, paltmode->vdo);
1569 
1570 		pmdata->altmodes++;
1571 	}
1572 }
1573 
tcpm_register_partner_altmodes(struct tcpm_port * port)1574 static void tcpm_register_partner_altmodes(struct tcpm_port *port)
1575 {
1576 	struct pd_mode_data *modep = &port->mode_data;
1577 	struct typec_altmode *altmode;
1578 	int i;
1579 
1580 	if (!port->partner)
1581 		return;
1582 
1583 	for (i = 0; i < modep->altmodes; i++) {
1584 		altmode = typec_partner_register_altmode(port->partner,
1585 						&modep->altmode_desc[i]);
1586 		if (IS_ERR(altmode)) {
1587 			tcpm_log(port, "Failed to register partner SVID 0x%04x",
1588 				 modep->altmode_desc[i].svid);
1589 			altmode = NULL;
1590 		}
1591 		port->partner_altmode[i] = altmode;
1592 	}
1593 }
1594 
1595 #define supports_modal(port)	PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
1596 
tcpm_pd_svdm(struct tcpm_port * port,struct typec_altmode * adev,const u32 * p,int cnt,u32 * response,enum adev_actions * adev_action)1597 static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
1598 			const u32 *p, int cnt, u32 *response,
1599 			enum adev_actions *adev_action)
1600 {
1601 	struct typec_port *typec = port->typec_port;
1602 	struct typec_altmode *pdev;
1603 	struct pd_mode_data *modep;
1604 	int svdm_version;
1605 	int rlen = 0;
1606 	int cmd_type;
1607 	int cmd;
1608 	int i;
1609 
1610 	cmd_type = PD_VDO_CMDT(p[0]);
1611 	cmd = PD_VDO_CMD(p[0]);
1612 
1613 	tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
1614 		 p[0], cmd_type, cmd, cnt);
1615 
1616 	modep = &port->mode_data;
1617 
1618 	pdev = typec_match_altmode(port->partner_altmode, ALTMODE_DISCOVERY_MAX,
1619 				   PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1620 
1621 	svdm_version = typec_get_negotiated_svdm_version(typec);
1622 	if (svdm_version < 0)
1623 		return 0;
1624 
1625 	switch (cmd_type) {
1626 	case CMDT_INIT:
1627 		switch (cmd) {
1628 		case CMD_DISCOVER_IDENT:
1629 			if (PD_VDO_VID(p[0]) != USB_SID_PD)
1630 				break;
1631 
1632 			if (IS_ERR_OR_NULL(port->partner))
1633 				break;
1634 
1635 			if (PD_VDO_SVDM_VER(p[0]) < svdm_version) {
1636 				typec_partner_set_svdm_version(port->partner,
1637 							       PD_VDO_SVDM_VER(p[0]));
1638 				svdm_version = PD_VDO_SVDM_VER(p[0]);
1639 			}
1640 
1641 			port->ams = DISCOVER_IDENTITY;
1642 			/*
1643 			 * PD2.0 Spec 6.10.3: respond with NAK as DFP (data host)
1644 			 * PD3.1 Spec 6.4.4.2.5.1: respond with NAK if "invalid field" or
1645 			 * "wrong configuation" or "Unrecognized"
1646 			 */
1647 			if ((port->data_role == TYPEC_DEVICE || svdm_version >= SVDM_VER_2_0) &&
1648 			    port->nr_snk_vdo) {
1649 				if (svdm_version < SVDM_VER_2_0) {
1650 					for (i = 0; i < port->nr_snk_vdo_v1; i++)
1651 						response[i + 1] = port->snk_vdo_v1[i];
1652 					rlen = port->nr_snk_vdo_v1 + 1;
1653 
1654 				} else {
1655 					for (i = 0; i < port->nr_snk_vdo; i++)
1656 						response[i + 1] = port->snk_vdo[i];
1657 					rlen = port->nr_snk_vdo + 1;
1658 				}
1659 			}
1660 			break;
1661 		case CMD_DISCOVER_SVID:
1662 			port->ams = DISCOVER_SVIDS;
1663 			break;
1664 		case CMD_DISCOVER_MODES:
1665 			port->ams = DISCOVER_MODES;
1666 			break;
1667 		case CMD_ENTER_MODE:
1668 			port->ams = DFP_TO_UFP_ENTER_MODE;
1669 			break;
1670 		case CMD_EXIT_MODE:
1671 			port->ams = DFP_TO_UFP_EXIT_MODE;
1672 			break;
1673 		case CMD_ATTENTION:
1674 			/* Attention command does not have response */
1675 			*adev_action = ADEV_ATTENTION;
1676 			return 0;
1677 		default:
1678 			break;
1679 		}
1680 		if (rlen >= 1) {
1681 			response[0] = p[0] | VDO_CMDT(CMDT_RSP_ACK);
1682 		} else if (rlen == 0) {
1683 			response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1684 			rlen = 1;
1685 		} else {
1686 			response[0] = p[0] | VDO_CMDT(CMDT_RSP_BUSY);
1687 			rlen = 1;
1688 		}
1689 		response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1690 			      (VDO_SVDM_VERS(typec_get_negotiated_svdm_version(typec)));
1691 		break;
1692 	case CMDT_RSP_ACK:
1693 		/* silently drop message if we are not connected */
1694 		if (IS_ERR_OR_NULL(port->partner))
1695 			break;
1696 
1697 		tcpm_ams_finish(port);
1698 
1699 		switch (cmd) {
1700 		case CMD_DISCOVER_IDENT:
1701 			if (PD_VDO_SVDM_VER(p[0]) < svdm_version)
1702 				typec_partner_set_svdm_version(port->partner,
1703 							       PD_VDO_SVDM_VER(p[0]));
1704 			/* 6.4.4.3.1 */
1705 			svdm_consume_identity(port, p, cnt);
1706 			response[0] = VDO(USB_SID_PD, 1, typec_get_negotiated_svdm_version(typec),
1707 					  CMD_DISCOVER_SVID);
1708 			rlen = 1;
1709 			break;
1710 		case CMD_DISCOVER_SVID:
1711 			/* 6.4.4.3.2 */
1712 			if (svdm_consume_svids(port, p, cnt)) {
1713 				response[0] = VDO(USB_SID_PD, 1, svdm_version, CMD_DISCOVER_SVID);
1714 				rlen = 1;
1715 			} else if (modep->nsvids && supports_modal(port)) {
1716 				response[0] = VDO(modep->svids[0], 1, svdm_version,
1717 						  CMD_DISCOVER_MODES);
1718 				rlen = 1;
1719 			}
1720 			break;
1721 		case CMD_DISCOVER_MODES:
1722 			/* 6.4.4.3.3 */
1723 			svdm_consume_modes(port, p, cnt);
1724 			modep->svid_index++;
1725 			if (modep->svid_index < modep->nsvids) {
1726 				u16 svid = modep->svids[modep->svid_index];
1727 				response[0] = VDO(svid, 1, svdm_version, CMD_DISCOVER_MODES);
1728 				rlen = 1;
1729 			} else {
1730 				tcpm_register_partner_altmodes(port);
1731 			}
1732 			break;
1733 		case CMD_ENTER_MODE:
1734 			if (adev && pdev)
1735 				*adev_action = ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL;
1736 			return 0;
1737 		case CMD_EXIT_MODE:
1738 			if (adev && pdev) {
1739 				/* Back to USB Operation */
1740 				*adev_action = ADEV_NOTIFY_USB_AND_QUEUE_VDM;
1741 				return 0;
1742 			}
1743 			break;
1744 		case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1745 			break;
1746 		default:
1747 			/* Unrecognized SVDM */
1748 			response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1749 			rlen = 1;
1750 			response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1751 				      (VDO_SVDM_VERS(svdm_version));
1752 			break;
1753 		}
1754 		break;
1755 	case CMDT_RSP_NAK:
1756 		tcpm_ams_finish(port);
1757 		switch (cmd) {
1758 		case CMD_DISCOVER_IDENT:
1759 		case CMD_DISCOVER_SVID:
1760 		case CMD_DISCOVER_MODES:
1761 		case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1762 			break;
1763 		case CMD_ENTER_MODE:
1764 			/* Back to USB Operation */
1765 			*adev_action = ADEV_NOTIFY_USB_AND_QUEUE_VDM;
1766 			return 0;
1767 		default:
1768 			/* Unrecognized SVDM */
1769 			response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1770 			rlen = 1;
1771 			response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1772 				      (VDO_SVDM_VERS(svdm_version));
1773 			break;
1774 		}
1775 		break;
1776 	default:
1777 		response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1778 		rlen = 1;
1779 		response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1780 			      (VDO_SVDM_VERS(svdm_version));
1781 		break;
1782 	}
1783 
1784 	/* Informing the alternate mode drivers about everything */
1785 	*adev_action = ADEV_QUEUE_VDM;
1786 	return rlen;
1787 }
1788 
1789 static void tcpm_pd_handle_msg(struct tcpm_port *port,
1790 			       enum pd_msg_request message,
1791 			       enum tcpm_ams ams);
1792 
tcpm_handle_vdm_request(struct tcpm_port * port,const __le32 * payload,int cnt)1793 static void tcpm_handle_vdm_request(struct tcpm_port *port,
1794 				    const __le32 *payload, int cnt)
1795 {
1796 	enum adev_actions adev_action = ADEV_NONE;
1797 	struct typec_altmode *adev;
1798 	u32 p[PD_MAX_PAYLOAD];
1799 	u32 response[8] = { };
1800 	int i, rlen = 0;
1801 
1802 	for (i = 0; i < cnt; i++)
1803 		p[i] = le32_to_cpu(payload[i]);
1804 
1805 	adev = typec_match_altmode(port->port_altmode, ALTMODE_DISCOVERY_MAX,
1806 				   PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1807 
1808 	if (port->vdm_state == VDM_STATE_BUSY) {
1809 		/* If UFP responded busy retry after timeout */
1810 		if (PD_VDO_CMDT(p[0]) == CMDT_RSP_BUSY) {
1811 			port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1812 			port->vdo_retry = (p[0] & ~VDO_CMDT_MASK) |
1813 				CMDT_INIT;
1814 			mod_vdm_delayed_work(port, PD_T_VDM_BUSY);
1815 			return;
1816 		}
1817 		port->vdm_state = VDM_STATE_DONE;
1818 	}
1819 
1820 	if (PD_VDO_SVDM(p[0]) && (adev || tcpm_vdm_ams(port) || port->nr_snk_vdo)) {
1821 		/*
1822 		 * Here a SVDM is received (INIT or RSP or unknown). Set the vdm_sm_running in
1823 		 * advance because we are dropping the lock but may send VDMs soon.
1824 		 * For the cases of INIT received:
1825 		 *  - If no response to send, it will be cleared later in this function.
1826 		 *  - If there are responses to send, it will be cleared in the state machine.
1827 		 * For the cases of RSP received:
1828 		 *  - If no further INIT to send, it will be cleared later in this function.
1829 		 *  - Otherwise, it will be cleared in the state machine if timeout or it will go
1830 		 *    back here until no further INIT to send.
1831 		 * For the cases of unknown type received:
1832 		 *  - We will send NAK and the flag will be cleared in the state machine.
1833 		 */
1834 		port->vdm_sm_running = true;
1835 		rlen = tcpm_pd_svdm(port, adev, p, cnt, response, &adev_action);
1836 	} else {
1837 		if (port->negotiated_rev >= PD_REV30)
1838 			tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
1839 	}
1840 
1841 	/*
1842 	 * We are done with any state stored in the port struct now, except
1843 	 * for any port struct changes done by the tcpm_queue_vdm() call
1844 	 * below, which is a separate operation.
1845 	 *
1846 	 * So we can safely release the lock here; and we MUST release the
1847 	 * lock here to avoid an AB BA lock inversion:
1848 	 *
1849 	 * If we keep the lock here then the lock ordering in this path is:
1850 	 * 1. tcpm_pd_rx_handler take the tcpm port lock
1851 	 * 2. One of the typec_altmode_* calls below takes the alt-mode's lock
1852 	 *
1853 	 * And we also have this ordering:
1854 	 * 1. alt-mode driver takes the alt-mode's lock
1855 	 * 2. alt-mode driver calls tcpm_altmode_enter which takes the
1856 	 *    tcpm port lock
1857 	 *
1858 	 * Dropping our lock here avoids this.
1859 	 */
1860 	mutex_unlock(&port->lock);
1861 
1862 	if (adev) {
1863 		switch (adev_action) {
1864 		case ADEV_NONE:
1865 			break;
1866 		case ADEV_NOTIFY_USB_AND_QUEUE_VDM:
1867 			WARN_ON(typec_altmode_notify(adev, TYPEC_STATE_USB, NULL));
1868 			typec_altmode_vdm(adev, p[0], &p[1], cnt);
1869 			break;
1870 		case ADEV_QUEUE_VDM:
1871 			typec_altmode_vdm(adev, p[0], &p[1], cnt);
1872 			break;
1873 		case ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL:
1874 			if (typec_altmode_vdm(adev, p[0], &p[1], cnt)) {
1875 				int svdm_version = typec_get_negotiated_svdm_version(
1876 									port->typec_port);
1877 				if (svdm_version < 0)
1878 					break;
1879 
1880 				response[0] = VDO(adev->svid, 1, svdm_version,
1881 						  CMD_EXIT_MODE);
1882 				response[0] |= VDO_OPOS(adev->mode);
1883 				rlen = 1;
1884 			}
1885 			break;
1886 		case ADEV_ATTENTION:
1887 			if (typec_altmode_attention(adev, p[1]))
1888 				tcpm_log(port, "typec_altmode_attention no port partner altmode");
1889 			break;
1890 		}
1891 	}
1892 
1893 	/*
1894 	 * We must re-take the lock here to balance the unlock in
1895 	 * tcpm_pd_rx_handler, note that no changes, other then the
1896 	 * tcpm_queue_vdm call, are made while the lock is held again.
1897 	 * All that is done after the call is unwinding the call stack until
1898 	 * we return to tcpm_pd_rx_handler and do the unlock there.
1899 	 */
1900 	mutex_lock(&port->lock);
1901 
1902 	if (rlen > 0)
1903 		tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1904 	else
1905 		port->vdm_sm_running = false;
1906 }
1907 
tcpm_send_vdm(struct tcpm_port * port,u32 vid,int cmd,const u32 * data,int count)1908 static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1909 			  const u32 *data, int count)
1910 {
1911 	int svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
1912 	u32 header;
1913 
1914 	if (svdm_version < 0)
1915 		return;
1916 
1917 	if (WARN_ON(count > VDO_MAX_SIZE - 1))
1918 		count = VDO_MAX_SIZE - 1;
1919 
1920 	/* set VDM header with VID & CMD */
1921 	header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1922 			1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION),
1923 			svdm_version, cmd);
1924 	tcpm_queue_vdm(port, header, data, count);
1925 }
1926 
vdm_ready_timeout(u32 vdm_hdr)1927 static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1928 {
1929 	unsigned int timeout;
1930 	int cmd = PD_VDO_CMD(vdm_hdr);
1931 
1932 	/* its not a structured VDM command */
1933 	if (!PD_VDO_SVDM(vdm_hdr))
1934 		return PD_T_VDM_UNSTRUCTURED;
1935 
1936 	switch (PD_VDO_CMDT(vdm_hdr)) {
1937 	case CMDT_INIT:
1938 		if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1939 			timeout = PD_T_VDM_WAIT_MODE_E;
1940 		else
1941 			timeout = PD_T_VDM_SNDR_RSP;
1942 		break;
1943 	default:
1944 		if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1945 			timeout = PD_T_VDM_E_MODE;
1946 		else
1947 			timeout = PD_T_VDM_RCVR_RSP;
1948 		break;
1949 	}
1950 	return timeout;
1951 }
1952 
vdm_run_state_machine(struct tcpm_port * port)1953 static void vdm_run_state_machine(struct tcpm_port *port)
1954 {
1955 	struct pd_message msg;
1956 	int i, res = 0;
1957 	u32 vdo_hdr = port->vdo_data[0];
1958 
1959 	switch (port->vdm_state) {
1960 	case VDM_STATE_READY:
1961 		/* Only transmit VDM if attached */
1962 		if (!port->attached) {
1963 			port->vdm_state = VDM_STATE_ERR_BUSY;
1964 			break;
1965 		}
1966 
1967 		/*
1968 		 * if there's traffic or we're not in PDO ready state don't send
1969 		 * a VDM.
1970 		 */
1971 		if (port->state != SRC_READY && port->state != SNK_READY) {
1972 			port->vdm_sm_running = false;
1973 			break;
1974 		}
1975 
1976 		/* TODO: AMS operation for Unstructured VDM */
1977 		if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) {
1978 			switch (PD_VDO_CMD(vdo_hdr)) {
1979 			case CMD_DISCOVER_IDENT:
1980 				res = tcpm_ams_start(port, DISCOVER_IDENTITY);
1981 				if (res == 0) {
1982 					port->send_discover = false;
1983 				} else if (res == -EAGAIN) {
1984 					port->vdo_data[0] = 0;
1985 					mod_send_discover_delayed_work(port,
1986 								       SEND_DISCOVER_RETRY_MS);
1987 				}
1988 				break;
1989 			case CMD_DISCOVER_SVID:
1990 				res = tcpm_ams_start(port, DISCOVER_SVIDS);
1991 				break;
1992 			case CMD_DISCOVER_MODES:
1993 				res = tcpm_ams_start(port, DISCOVER_MODES);
1994 				break;
1995 			case CMD_ENTER_MODE:
1996 				res = tcpm_ams_start(port, DFP_TO_UFP_ENTER_MODE);
1997 				break;
1998 			case CMD_EXIT_MODE:
1999 				res = tcpm_ams_start(port, DFP_TO_UFP_EXIT_MODE);
2000 				break;
2001 			case CMD_ATTENTION:
2002 				res = tcpm_ams_start(port, ATTENTION);
2003 				break;
2004 			case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
2005 				res = tcpm_ams_start(port, STRUCTURED_VDMS);
2006 				break;
2007 			default:
2008 				res = -EOPNOTSUPP;
2009 				break;
2010 			}
2011 
2012 			if (res < 0) {
2013 				port->vdm_state = VDM_STATE_ERR_BUSY;
2014 				return;
2015 			}
2016 		}
2017 
2018 		port->vdm_state = VDM_STATE_SEND_MESSAGE;
2019 		mod_vdm_delayed_work(port, (port->negotiated_rev >= PD_REV30 &&
2020 					    port->pwr_role == TYPEC_SOURCE &&
2021 					    PD_VDO_SVDM(vdo_hdr) &&
2022 					    PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) ?
2023 					   PD_T_SINK_TX : 0);
2024 		break;
2025 	case VDM_STATE_WAIT_RSP_BUSY:
2026 		port->vdo_data[0] = port->vdo_retry;
2027 		port->vdo_count = 1;
2028 		port->vdm_state = VDM_STATE_READY;
2029 		tcpm_ams_finish(port);
2030 		break;
2031 	case VDM_STATE_BUSY:
2032 		port->vdm_state = VDM_STATE_ERR_TMOUT;
2033 		if (port->ams != NONE_AMS)
2034 			tcpm_ams_finish(port);
2035 		break;
2036 	case VDM_STATE_ERR_SEND:
2037 		/*
2038 		 * A partner which does not support USB PD will not reply,
2039 		 * so this is not a fatal error. At the same time, some
2040 		 * devices may not return GoodCRC under some circumstances,
2041 		 * so we need to retry.
2042 		 */
2043 		if (port->vdm_retries < 3) {
2044 			tcpm_log(port, "VDM Tx error, retry");
2045 			port->vdm_retries++;
2046 			port->vdm_state = VDM_STATE_READY;
2047 			if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMDT(vdo_hdr) == CMDT_INIT)
2048 				tcpm_ams_finish(port);
2049 		} else {
2050 			tcpm_ams_finish(port);
2051 		}
2052 		break;
2053 	case VDM_STATE_SEND_MESSAGE:
2054 		/* Prepare and send VDM */
2055 		memset(&msg, 0, sizeof(msg));
2056 		msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
2057 					  port->pwr_role,
2058 					  port->data_role,
2059 					  port->negotiated_rev,
2060 					  port->message_id, port->vdo_count);
2061 		for (i = 0; i < port->vdo_count; i++)
2062 			msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
2063 		res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2064 		if (res < 0) {
2065 			port->vdm_state = VDM_STATE_ERR_SEND;
2066 		} else {
2067 			unsigned long timeout;
2068 
2069 			port->vdm_retries = 0;
2070 			port->vdo_data[0] = 0;
2071 			port->vdm_state = VDM_STATE_BUSY;
2072 			timeout = vdm_ready_timeout(vdo_hdr);
2073 			mod_vdm_delayed_work(port, timeout);
2074 		}
2075 		break;
2076 	default:
2077 		break;
2078 	}
2079 }
2080 
vdm_state_machine_work(struct kthread_work * work)2081 static void vdm_state_machine_work(struct kthread_work *work)
2082 {
2083 	struct tcpm_port *port = container_of(work, struct tcpm_port, vdm_state_machine);
2084 	enum vdm_states prev_state;
2085 
2086 	mutex_lock(&port->lock);
2087 
2088 	/*
2089 	 * Continue running as long as the port is not busy and there was
2090 	 * a state change.
2091 	 */
2092 	do {
2093 		prev_state = port->vdm_state;
2094 		vdm_run_state_machine(port);
2095 	} while (port->vdm_state != prev_state &&
2096 		 port->vdm_state != VDM_STATE_BUSY &&
2097 		 port->vdm_state != VDM_STATE_SEND_MESSAGE);
2098 
2099 	if (port->vdm_state < VDM_STATE_READY)
2100 		port->vdm_sm_running = false;
2101 
2102 	mutex_unlock(&port->lock);
2103 }
2104 
2105 enum pdo_err {
2106 	PDO_NO_ERR,
2107 	PDO_ERR_NO_VSAFE5V,
2108 	PDO_ERR_VSAFE5V_NOT_FIRST,
2109 	PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
2110 	PDO_ERR_FIXED_NOT_SORTED,
2111 	PDO_ERR_VARIABLE_BATT_NOT_SORTED,
2112 	PDO_ERR_DUPE_PDO,
2113 	PDO_ERR_PPS_APDO_NOT_SORTED,
2114 	PDO_ERR_DUPE_PPS_APDO,
2115 };
2116 
2117 static const char * const pdo_err_msg[] = {
2118 	[PDO_ERR_NO_VSAFE5V] =
2119 	" err: source/sink caps should at least have vSafe5V",
2120 	[PDO_ERR_VSAFE5V_NOT_FIRST] =
2121 	" err: vSafe5V Fixed Supply Object Shall always be the first object",
2122 	[PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
2123 	" err: PDOs should be in the following order: Fixed; Battery; Variable",
2124 	[PDO_ERR_FIXED_NOT_SORTED] =
2125 	" err: Fixed supply pdos should be in increasing order of their fixed voltage",
2126 	[PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
2127 	" err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
2128 	[PDO_ERR_DUPE_PDO] =
2129 	" err: Variable/Batt supply pdos cannot have same min/max voltage",
2130 	[PDO_ERR_PPS_APDO_NOT_SORTED] =
2131 	" err: Programmable power supply apdos should be in increasing order of their maximum voltage",
2132 	[PDO_ERR_DUPE_PPS_APDO] =
2133 	" err: Programmable power supply apdos cannot have same min/max voltage and max current",
2134 };
2135 
tcpm_caps_err(struct tcpm_port * port,const u32 * pdo,unsigned int nr_pdo)2136 static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
2137 				  unsigned int nr_pdo)
2138 {
2139 	unsigned int i;
2140 
2141 	/* Should at least contain vSafe5v */
2142 	if (nr_pdo < 1)
2143 		return PDO_ERR_NO_VSAFE5V;
2144 
2145 	/* The vSafe5V Fixed Supply Object Shall always be the first object */
2146 	if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
2147 	    pdo_fixed_voltage(pdo[0]) != VSAFE5V)
2148 		return PDO_ERR_VSAFE5V_NOT_FIRST;
2149 
2150 	for (i = 1; i < nr_pdo; i++) {
2151 		if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
2152 			return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
2153 		} else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
2154 			enum pd_pdo_type type = pdo_type(pdo[i]);
2155 
2156 			switch (type) {
2157 			/*
2158 			 * The remaining Fixed Supply Objects, if
2159 			 * present, shall be sent in voltage order;
2160 			 * lowest to highest.
2161 			 */
2162 			case PDO_TYPE_FIXED:
2163 				if (pdo_fixed_voltage(pdo[i]) <=
2164 				    pdo_fixed_voltage(pdo[i - 1]))
2165 					return PDO_ERR_FIXED_NOT_SORTED;
2166 				break;
2167 			/*
2168 			 * The Battery Supply Objects and Variable
2169 			 * supply, if present shall be sent in Minimum
2170 			 * Voltage order; lowest to highest.
2171 			 */
2172 			case PDO_TYPE_VAR:
2173 			case PDO_TYPE_BATT:
2174 				if (pdo_min_voltage(pdo[i]) <
2175 				    pdo_min_voltage(pdo[i - 1]))
2176 					return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
2177 				else if ((pdo_min_voltage(pdo[i]) ==
2178 					  pdo_min_voltage(pdo[i - 1])) &&
2179 					 (pdo_max_voltage(pdo[i]) ==
2180 					  pdo_max_voltage(pdo[i - 1])))
2181 					return PDO_ERR_DUPE_PDO;
2182 				break;
2183 			/*
2184 			 * The Programmable Power Supply APDOs, if present,
2185 			 * shall be sent in Maximum Voltage order;
2186 			 * lowest to highest.
2187 			 */
2188 			case PDO_TYPE_APDO:
2189 				if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
2190 					break;
2191 
2192 				if (pdo_pps_apdo_max_voltage(pdo[i]) <
2193 				    pdo_pps_apdo_max_voltage(pdo[i - 1]))
2194 					return PDO_ERR_PPS_APDO_NOT_SORTED;
2195 				else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
2196 					  pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
2197 					 pdo_pps_apdo_max_voltage(pdo[i]) ==
2198 					  pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
2199 					 pdo_pps_apdo_max_current(pdo[i]) ==
2200 					  pdo_pps_apdo_max_current(pdo[i - 1]))
2201 					return PDO_ERR_DUPE_PPS_APDO;
2202 				break;
2203 			default:
2204 				tcpm_log_force(port, " Unknown pdo type");
2205 			}
2206 		}
2207 	}
2208 
2209 	return PDO_NO_ERR;
2210 }
2211 
tcpm_validate_caps(struct tcpm_port * port,const u32 * pdo,unsigned int nr_pdo)2212 static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
2213 			      unsigned int nr_pdo)
2214 {
2215 	enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo);
2216 
2217 	if (err_index != PDO_NO_ERR) {
2218 		tcpm_log_force(port, " %s", pdo_err_msg[err_index]);
2219 		return -EINVAL;
2220 	}
2221 
2222 	return 0;
2223 }
2224 
tcpm_altmode_enter(struct typec_altmode * altmode,u32 * vdo)2225 static int tcpm_altmode_enter(struct typec_altmode *altmode, u32 *vdo)
2226 {
2227 	struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2228 	int svdm_version;
2229 	u32 header;
2230 
2231 	svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
2232 	if (svdm_version < 0)
2233 		return svdm_version;
2234 
2235 	header = VDO(altmode->svid, vdo ? 2 : 1, svdm_version, CMD_ENTER_MODE);
2236 	header |= VDO_OPOS(altmode->mode);
2237 
2238 	tcpm_queue_vdm_unlocked(port, header, vdo, vdo ? 1 : 0);
2239 	return 0;
2240 }
2241 
tcpm_altmode_exit(struct typec_altmode * altmode)2242 static int tcpm_altmode_exit(struct typec_altmode *altmode)
2243 {
2244 	struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2245 	int svdm_version;
2246 	u32 header;
2247 
2248 	svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
2249 	if (svdm_version < 0)
2250 		return svdm_version;
2251 
2252 	header = VDO(altmode->svid, 1, svdm_version, CMD_EXIT_MODE);
2253 	header |= VDO_OPOS(altmode->mode);
2254 
2255 	tcpm_queue_vdm_unlocked(port, header, NULL, 0);
2256 	return 0;
2257 }
2258 
tcpm_altmode_vdm(struct typec_altmode * altmode,u32 header,const u32 * data,int count)2259 static int tcpm_altmode_vdm(struct typec_altmode *altmode,
2260 			    u32 header, const u32 *data, int count)
2261 {
2262 	struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2263 
2264 	tcpm_queue_vdm_unlocked(port, header, data, count - 1);
2265 
2266 	return 0;
2267 }
2268 
2269 static const struct typec_altmode_ops tcpm_altmode_ops = {
2270 	.enter = tcpm_altmode_enter,
2271 	.exit = tcpm_altmode_exit,
2272 	.vdm = tcpm_altmode_vdm,
2273 };
2274 
2275 /*
2276  * PD (data, control) command handling functions
2277  */
ready_state(struct tcpm_port * port)2278 static inline enum tcpm_state ready_state(struct tcpm_port *port)
2279 {
2280 	if (port->pwr_role == TYPEC_SOURCE)
2281 		return SRC_READY;
2282 	else
2283 		return SNK_READY;
2284 }
2285 
2286 static int tcpm_pd_send_control(struct tcpm_port *port,
2287 				enum pd_ctrl_msg_type type);
2288 
tcpm_handle_alert(struct tcpm_port * port,const __le32 * payload,int cnt)2289 static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
2290 			      int cnt)
2291 {
2292 	u32 p0 = le32_to_cpu(payload[0]);
2293 	unsigned int type = usb_pd_ado_type(p0);
2294 
2295 	if (!type) {
2296 		tcpm_log(port, "Alert message received with no type");
2297 		tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
2298 		return;
2299 	}
2300 
2301 	/* Just handling non-battery alerts for now */
2302 	if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
2303 		if (port->pwr_role == TYPEC_SOURCE) {
2304 			port->upcoming_state = GET_STATUS_SEND;
2305 			tcpm_ams_start(port, GETTING_SOURCE_SINK_STATUS);
2306 		} else {
2307 			/*
2308 			 * Do not check SinkTxOk here in case the Source doesn't set its Rp to
2309 			 * SinkTxOk in time.
2310 			 */
2311 			port->ams = GETTING_SOURCE_SINK_STATUS;
2312 			tcpm_set_state(port, GET_STATUS_SEND, 0);
2313 		}
2314 	} else {
2315 		tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
2316 	}
2317 }
2318 
tcpm_set_auto_vbus_discharge_threshold(struct tcpm_port * port,enum typec_pwr_opmode mode,bool pps_active,u32 requested_vbus_voltage)2319 static int tcpm_set_auto_vbus_discharge_threshold(struct tcpm_port *port,
2320 						  enum typec_pwr_opmode mode, bool pps_active,
2321 						  u32 requested_vbus_voltage)
2322 {
2323 	int ret;
2324 
2325 	if (!port->tcpc->set_auto_vbus_discharge_threshold)
2326 		return 0;
2327 
2328 	ret = port->tcpc->set_auto_vbus_discharge_threshold(port->tcpc, mode, pps_active,
2329 							    requested_vbus_voltage);
2330 	tcpm_log_force(port,
2331 		       "set_auto_vbus_discharge_threshold mode:%d pps_active:%c vbus:%u ret:%d",
2332 		       mode, pps_active ? 'y' : 'n', requested_vbus_voltage, ret);
2333 
2334 	return ret;
2335 }
2336 
tcpm_pd_handle_state(struct tcpm_port * port,enum tcpm_state state,enum tcpm_ams ams,unsigned int delay_ms)2337 static void tcpm_pd_handle_state(struct tcpm_port *port,
2338 				 enum tcpm_state state,
2339 				 enum tcpm_ams ams,
2340 				 unsigned int delay_ms)
2341 {
2342 	switch (port->state) {
2343 	case SRC_READY:
2344 	case SNK_READY:
2345 		port->ams = ams;
2346 		tcpm_set_state(port, state, delay_ms);
2347 		break;
2348 	/* 8.3.3.4.1.1 and 6.8.1 power transitioning */
2349 	case SNK_TRANSITION_SINK:
2350 	case SNK_TRANSITION_SINK_VBUS:
2351 	case SRC_TRANSITION_SUPPLY:
2352 		tcpm_set_state(port, HARD_RESET_SEND, 0);
2353 		break;
2354 	default:
2355 		if (!tcpm_ams_interruptible(port)) {
2356 			tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
2357 				       SRC_SOFT_RESET_WAIT_SNK_TX :
2358 				       SNK_SOFT_RESET,
2359 				       0);
2360 		} else {
2361 			/* process the Message 6.8.1 */
2362 			port->upcoming_state = state;
2363 			port->next_ams = ams;
2364 			tcpm_set_state(port, ready_state(port), delay_ms);
2365 		}
2366 		break;
2367 	}
2368 }
2369 
tcpm_pd_handle_msg(struct tcpm_port * port,enum pd_msg_request message,enum tcpm_ams ams)2370 static void tcpm_pd_handle_msg(struct tcpm_port *port,
2371 			       enum pd_msg_request message,
2372 			       enum tcpm_ams ams)
2373 {
2374 	switch (port->state) {
2375 	case SRC_READY:
2376 	case SNK_READY:
2377 		port->ams = ams;
2378 		tcpm_queue_message(port, message);
2379 		break;
2380 	/* PD 3.0 Spec 8.3.3.4.1.1 and 6.8.1 */
2381 	case SNK_TRANSITION_SINK:
2382 	case SNK_TRANSITION_SINK_VBUS:
2383 	case SRC_TRANSITION_SUPPLY:
2384 		tcpm_set_state(port, HARD_RESET_SEND, 0);
2385 		break;
2386 	default:
2387 		if (!tcpm_ams_interruptible(port)) {
2388 			tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
2389 				       SRC_SOFT_RESET_WAIT_SNK_TX :
2390 				       SNK_SOFT_RESET,
2391 				       0);
2392 		} else {
2393 			port->next_ams = ams;
2394 			tcpm_set_state(port, ready_state(port), 0);
2395 			/* 6.8.1 process the Message */
2396 			tcpm_queue_message(port, message);
2397 		}
2398 		break;
2399 	}
2400 }
2401 
tcpm_register_source_caps(struct tcpm_port * port)2402 static int tcpm_register_source_caps(struct tcpm_port *port)
2403 {
2404 	struct usb_power_delivery_desc desc = { port->negotiated_rev };
2405 	struct usb_power_delivery_capabilities_desc caps = { };
2406 	struct usb_power_delivery_capabilities *cap = port->partner_source_caps;
2407 
2408 	if (!port->partner_pd)
2409 		port->partner_pd = usb_power_delivery_register(NULL, &desc);
2410 	if (IS_ERR(port->partner_pd))
2411 		return PTR_ERR(port->partner_pd);
2412 
2413 	memcpy(caps.pdo, port->source_caps, sizeof(u32) * port->nr_source_caps);
2414 	caps.role = TYPEC_SOURCE;
2415 
2416 	if (cap) {
2417 		usb_power_delivery_unregister_capabilities(cap);
2418 		port->partner_source_caps = NULL;
2419 	}
2420 
2421 	cap = usb_power_delivery_register_capabilities(port->partner_pd, &caps);
2422 	if (IS_ERR(cap))
2423 		return PTR_ERR(cap);
2424 
2425 	port->partner_source_caps = cap;
2426 
2427 	return 0;
2428 }
2429 
tcpm_register_sink_caps(struct tcpm_port * port)2430 static int tcpm_register_sink_caps(struct tcpm_port *port)
2431 {
2432 	struct usb_power_delivery_desc desc = { port->negotiated_rev };
2433 	struct usb_power_delivery_capabilities_desc caps = { };
2434 	struct usb_power_delivery_capabilities *cap;
2435 
2436 	if (!port->partner_pd)
2437 		port->partner_pd = usb_power_delivery_register(NULL, &desc);
2438 	if (IS_ERR(port->partner_pd))
2439 		return PTR_ERR(port->partner_pd);
2440 
2441 	memcpy(caps.pdo, port->sink_caps, sizeof(u32) * port->nr_sink_caps);
2442 	caps.role = TYPEC_SINK;
2443 
2444 	cap = usb_power_delivery_register_capabilities(port->partner_pd, &caps);
2445 	if (IS_ERR(cap))
2446 		return PTR_ERR(cap);
2447 
2448 	port->partner_sink_caps = cap;
2449 
2450 	return 0;
2451 }
2452 
tcpm_pd_data_request(struct tcpm_port * port,const struct pd_message * msg)2453 static void tcpm_pd_data_request(struct tcpm_port *port,
2454 				 const struct pd_message *msg)
2455 {
2456 	enum pd_data_msg_type type = pd_header_type_le(msg->header);
2457 	unsigned int cnt = pd_header_cnt_le(msg->header);
2458 	unsigned int rev = pd_header_rev_le(msg->header);
2459 	unsigned int i;
2460 	enum frs_typec_current partner_frs_current;
2461 	bool frs_enable;
2462 	int ret;
2463 
2464 	if (tcpm_vdm_ams(port) && type != PD_DATA_VENDOR_DEF) {
2465 		port->vdm_state = VDM_STATE_ERR_BUSY;
2466 		tcpm_ams_finish(port);
2467 		mod_vdm_delayed_work(port, 0);
2468 	}
2469 
2470 	switch (type) {
2471 	case PD_DATA_SOURCE_CAP:
2472 		for (i = 0; i < cnt; i++)
2473 			port->source_caps[i] = le32_to_cpu(msg->payload[i]);
2474 
2475 		port->nr_source_caps = cnt;
2476 
2477 		tcpm_log_source_caps(port);
2478 
2479 		tcpm_validate_caps(port, port->source_caps,
2480 				   port->nr_source_caps);
2481 
2482 		tcpm_register_source_caps(port);
2483 
2484 		/*
2485 		 * Adjust revision in subsequent message headers, as required,
2486 		 * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
2487 		 * support Rev 1.0 so just do nothing in that scenario.
2488 		 */
2489 		if (rev == PD_REV10) {
2490 			if (port->ams == GET_SOURCE_CAPABILITIES)
2491 				tcpm_ams_finish(port);
2492 			break;
2493 		}
2494 
2495 		if (rev < PD_MAX_REV)
2496 			port->negotiated_rev = rev;
2497 
2498 		if (port->pwr_role == TYPEC_SOURCE) {
2499 			if (port->ams == GET_SOURCE_CAPABILITIES)
2500 				tcpm_pd_handle_state(port, SRC_READY, NONE_AMS, 0);
2501 			/* Unexpected Source Capabilities */
2502 			else
2503 				tcpm_pd_handle_msg(port,
2504 						   port->negotiated_rev < PD_REV30 ?
2505 						   PD_MSG_CTRL_REJECT :
2506 						   PD_MSG_CTRL_NOT_SUPP,
2507 						   NONE_AMS);
2508 		} else if (port->state == SNK_WAIT_CAPABILITIES) {
2509 		/*
2510 		 * This message may be received even if VBUS is not
2511 		 * present. This is quite unexpected; see USB PD
2512 		 * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
2513 		 * However, at the same time, we must be ready to
2514 		 * receive this message and respond to it 15ms after
2515 		 * receiving PS_RDY during power swap operations, no matter
2516 		 * if VBUS is available or not (USB PD specification,
2517 		 * section 6.5.9.2).
2518 		 * So we need to accept the message either way,
2519 		 * but be prepared to keep waiting for VBUS after it was
2520 		 * handled.
2521 		 */
2522 			port->ams = POWER_NEGOTIATION;
2523 			port->in_ams = true;
2524 			tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
2525 		} else {
2526 			if (port->ams == GET_SOURCE_CAPABILITIES)
2527 				tcpm_ams_finish(port);
2528 			tcpm_pd_handle_state(port, SNK_NEGOTIATE_CAPABILITIES,
2529 					     POWER_NEGOTIATION, 0);
2530 		}
2531 		break;
2532 	case PD_DATA_REQUEST:
2533 		/*
2534 		 * Adjust revision in subsequent message headers, as required,
2535 		 * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
2536 		 * support Rev 1.0 so just reject in that scenario.
2537 		 */
2538 		if (rev == PD_REV10) {
2539 			tcpm_pd_handle_msg(port,
2540 					   port->negotiated_rev < PD_REV30 ?
2541 					   PD_MSG_CTRL_REJECT :
2542 					   PD_MSG_CTRL_NOT_SUPP,
2543 					   NONE_AMS);
2544 			break;
2545 		}
2546 
2547 		if (rev < PD_MAX_REV)
2548 			port->negotiated_rev = rev;
2549 
2550 		if (port->pwr_role != TYPEC_SOURCE || cnt != 1) {
2551 			tcpm_pd_handle_msg(port,
2552 					   port->negotiated_rev < PD_REV30 ?
2553 					   PD_MSG_CTRL_REJECT :
2554 					   PD_MSG_CTRL_NOT_SUPP,
2555 					   NONE_AMS);
2556 			break;
2557 		}
2558 
2559 		port->sink_request = le32_to_cpu(msg->payload[0]);
2560 
2561 		if (port->vdm_sm_running && port->explicit_contract) {
2562 			tcpm_pd_handle_msg(port, PD_MSG_CTRL_WAIT, port->ams);
2563 			break;
2564 		}
2565 
2566 		if (port->state == SRC_SEND_CAPABILITIES)
2567 			tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
2568 		else
2569 			tcpm_pd_handle_state(port, SRC_NEGOTIATE_CAPABILITIES,
2570 					     POWER_NEGOTIATION, 0);
2571 		break;
2572 	case PD_DATA_SINK_CAP:
2573 		/* We don't do anything with this at the moment... */
2574 		for (i = 0; i < cnt; i++)
2575 			port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
2576 
2577 		partner_frs_current = (port->sink_caps[0] & PDO_FIXED_FRS_CURR_MASK) >>
2578 			PDO_FIXED_FRS_CURR_SHIFT;
2579 		frs_enable = partner_frs_current && (partner_frs_current <=
2580 						     port->new_source_frs_current);
2581 		tcpm_log(port,
2582 			 "Port partner FRS capable partner_frs_current:%u port_frs_current:%u enable:%c",
2583 			 partner_frs_current, port->new_source_frs_current, frs_enable ? 'y' : 'n');
2584 		if (frs_enable) {
2585 			ret  = port->tcpc->enable_frs(port->tcpc, true);
2586 			tcpm_log(port, "Enable FRS %s, ret:%d\n", ret ? "fail" : "success", ret);
2587 		}
2588 
2589 		port->nr_sink_caps = cnt;
2590 		port->sink_cap_done = true;
2591 		tcpm_register_sink_caps(port);
2592 
2593 		if (port->ams == GET_SINK_CAPABILITIES)
2594 			tcpm_set_state(port, ready_state(port), 0);
2595 		/* Unexpected Sink Capabilities */
2596 		else
2597 			tcpm_pd_handle_msg(port,
2598 					   port->negotiated_rev < PD_REV30 ?
2599 					   PD_MSG_CTRL_REJECT :
2600 					   PD_MSG_CTRL_NOT_SUPP,
2601 					   NONE_AMS);
2602 		break;
2603 	case PD_DATA_VENDOR_DEF:
2604 		tcpm_handle_vdm_request(port, msg->payload, cnt);
2605 		break;
2606 	case PD_DATA_BIST:
2607 		port->bist_request = le32_to_cpu(msg->payload[0]);
2608 		tcpm_pd_handle_state(port, BIST_RX, BIST, 0);
2609 		break;
2610 	case PD_DATA_ALERT:
2611 		if (port->state != SRC_READY && port->state != SNK_READY)
2612 			tcpm_pd_handle_state(port, port->pwr_role == TYPEC_SOURCE ?
2613 					     SRC_SOFT_RESET_WAIT_SNK_TX : SNK_SOFT_RESET,
2614 					     NONE_AMS, 0);
2615 		else
2616 			tcpm_handle_alert(port, msg->payload, cnt);
2617 		break;
2618 	case PD_DATA_BATT_STATUS:
2619 	case PD_DATA_GET_COUNTRY_INFO:
2620 		/* Currently unsupported */
2621 		tcpm_pd_handle_msg(port, port->negotiated_rev < PD_REV30 ?
2622 				   PD_MSG_CTRL_REJECT :
2623 				   PD_MSG_CTRL_NOT_SUPP,
2624 				   NONE_AMS);
2625 		break;
2626 	default:
2627 		tcpm_pd_handle_msg(port, port->negotiated_rev < PD_REV30 ?
2628 				   PD_MSG_CTRL_REJECT :
2629 				   PD_MSG_CTRL_NOT_SUPP,
2630 				   NONE_AMS);
2631 		tcpm_log(port, "Unrecognized data message type %#x", type);
2632 		break;
2633 	}
2634 }
2635 
tcpm_pps_complete(struct tcpm_port * port,int result)2636 static void tcpm_pps_complete(struct tcpm_port *port, int result)
2637 {
2638 	if (port->pps_pending) {
2639 		port->pps_status = result;
2640 		port->pps_pending = false;
2641 		complete(&port->pps_complete);
2642 	}
2643 }
2644 
tcpm_pd_ctrl_request(struct tcpm_port * port,const struct pd_message * msg)2645 static void tcpm_pd_ctrl_request(struct tcpm_port *port,
2646 				 const struct pd_message *msg)
2647 {
2648 	enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
2649 	enum tcpm_state next_state;
2650 
2651 	/*
2652 	 * Stop VDM state machine if interrupted by other Messages while NOT_SUPP is allowed in
2653 	 * VDM AMS if waiting for VDM responses and will be handled later.
2654 	 */
2655 	if (tcpm_vdm_ams(port) && type != PD_CTRL_NOT_SUPP && type != PD_CTRL_GOOD_CRC) {
2656 		port->vdm_state = VDM_STATE_ERR_BUSY;
2657 		tcpm_ams_finish(port);
2658 		mod_vdm_delayed_work(port, 0);
2659 	}
2660 
2661 	switch (type) {
2662 	case PD_CTRL_GOOD_CRC:
2663 	case PD_CTRL_PING:
2664 		break;
2665 	case PD_CTRL_GET_SOURCE_CAP:
2666 		tcpm_pd_handle_msg(port, PD_MSG_DATA_SOURCE_CAP, GET_SOURCE_CAPABILITIES);
2667 		break;
2668 	case PD_CTRL_GET_SINK_CAP:
2669 		tcpm_pd_handle_msg(port, PD_MSG_DATA_SINK_CAP, GET_SINK_CAPABILITIES);
2670 		break;
2671 	case PD_CTRL_GOTO_MIN:
2672 		break;
2673 	case PD_CTRL_PS_RDY:
2674 		switch (port->state) {
2675 		case SNK_TRANSITION_SINK:
2676 			if (port->vbus_present) {
2677 				tcpm_set_current_limit(port,
2678 						       port->req_current_limit,
2679 						       port->req_supply_voltage);
2680 				port->explicit_contract = true;
2681 				tcpm_set_auto_vbus_discharge_threshold(port,
2682 								       TYPEC_PWR_MODE_PD,
2683 								       port->pps_data.active,
2684 								       port->supply_voltage);
2685 				tcpm_set_state(port, SNK_READY, 0);
2686 			} else {
2687 				/*
2688 				 * Seen after power swap. Keep waiting for VBUS
2689 				 * in a transitional state.
2690 				 */
2691 				tcpm_set_state(port,
2692 					       SNK_TRANSITION_SINK_VBUS, 0);
2693 			}
2694 			break;
2695 		case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
2696 			tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
2697 			break;
2698 		case PR_SWAP_SNK_SRC_SINK_OFF:
2699 			tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
2700 			break;
2701 		case VCONN_SWAP_WAIT_FOR_VCONN:
2702 			tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
2703 			break;
2704 		case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
2705 			tcpm_set_state(port, FR_SWAP_SNK_SRC_NEW_SINK_READY, 0);
2706 			break;
2707 		default:
2708 			tcpm_pd_handle_state(port,
2709 					     port->pwr_role == TYPEC_SOURCE ?
2710 					     SRC_SOFT_RESET_WAIT_SNK_TX :
2711 					     SNK_SOFT_RESET,
2712 					     NONE_AMS, 0);
2713 			break;
2714 		}
2715 		break;
2716 	case PD_CTRL_REJECT:
2717 	case PD_CTRL_WAIT:
2718 	case PD_CTRL_NOT_SUPP:
2719 		switch (port->state) {
2720 		case SNK_NEGOTIATE_CAPABILITIES:
2721 			/* USB PD specification, Figure 8-43 */
2722 			if (port->explicit_contract)
2723 				next_state = SNK_READY;
2724 			else
2725 				next_state = SNK_WAIT_CAPABILITIES;
2726 
2727 			/* Threshold was relaxed before sending Request. Restore it back. */
2728 			tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
2729 							       port->pps_data.active,
2730 							       port->supply_voltage);
2731 			tcpm_set_state(port, next_state, 0);
2732 			break;
2733 		case SNK_NEGOTIATE_PPS_CAPABILITIES:
2734 			/* Revert data back from any requested PPS updates */
2735 			port->pps_data.req_out_volt = port->supply_voltage;
2736 			port->pps_data.req_op_curr = port->current_limit;
2737 			port->pps_status = (type == PD_CTRL_WAIT ?
2738 					    -EAGAIN : -EOPNOTSUPP);
2739 
2740 			/* Threshold was relaxed before sending Request. Restore it back. */
2741 			tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
2742 							       port->pps_data.active,
2743 							       port->supply_voltage);
2744 
2745 			tcpm_set_state(port, SNK_READY, 0);
2746 			break;
2747 		case DR_SWAP_SEND:
2748 			port->swap_status = (type == PD_CTRL_WAIT ?
2749 					     -EAGAIN : -EOPNOTSUPP);
2750 			tcpm_set_state(port, DR_SWAP_CANCEL, 0);
2751 			break;
2752 		case PR_SWAP_SEND:
2753 			port->swap_status = (type == PD_CTRL_WAIT ?
2754 					     -EAGAIN : -EOPNOTSUPP);
2755 			tcpm_set_state(port, PR_SWAP_CANCEL, 0);
2756 			break;
2757 		case VCONN_SWAP_SEND:
2758 			port->swap_status = (type == PD_CTRL_WAIT ?
2759 					     -EAGAIN : -EOPNOTSUPP);
2760 			tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
2761 			break;
2762 		case FR_SWAP_SEND:
2763 			tcpm_set_state(port, FR_SWAP_CANCEL, 0);
2764 			break;
2765 		case GET_SINK_CAP:
2766 			port->sink_cap_done = true;
2767 			tcpm_set_state(port, ready_state(port), 0);
2768 			break;
2769 		/*
2770 		 * Some port partners do not support GET_STATUS, avoid soft reset the link to
2771 		 * prevent redundant power re-negotiation
2772 		 */
2773 		case GET_STATUS_SEND:
2774 			tcpm_set_state(port, ready_state(port), 0);
2775 			break;
2776 		case SRC_READY:
2777 		case SNK_READY:
2778 			if (port->vdm_state > VDM_STATE_READY) {
2779 				port->vdm_state = VDM_STATE_DONE;
2780 				if (tcpm_vdm_ams(port))
2781 					tcpm_ams_finish(port);
2782 				mod_vdm_delayed_work(port, 0);
2783 				break;
2784 			}
2785 			fallthrough;
2786 		default:
2787 			tcpm_pd_handle_state(port,
2788 					     port->pwr_role == TYPEC_SOURCE ?
2789 					     SRC_SOFT_RESET_WAIT_SNK_TX :
2790 					     SNK_SOFT_RESET,
2791 					     NONE_AMS, 0);
2792 			break;
2793 		}
2794 		break;
2795 	case PD_CTRL_ACCEPT:
2796 		switch (port->state) {
2797 		case SNK_NEGOTIATE_CAPABILITIES:
2798 			port->pps_data.active = false;
2799 			tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
2800 			break;
2801 		case SNK_NEGOTIATE_PPS_CAPABILITIES:
2802 			port->pps_data.active = true;
2803 			port->pps_data.min_volt = port->pps_data.req_min_volt;
2804 			port->pps_data.max_volt = port->pps_data.req_max_volt;
2805 			port->pps_data.max_curr = port->pps_data.req_max_curr;
2806 			port->req_supply_voltage = port->pps_data.req_out_volt;
2807 			port->req_current_limit = port->pps_data.req_op_curr;
2808 			power_supply_changed(port->psy);
2809 			tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
2810 			break;
2811 		case SOFT_RESET_SEND:
2812 			if (port->ams == SOFT_RESET_AMS)
2813 				tcpm_ams_finish(port);
2814 			if (port->pwr_role == TYPEC_SOURCE) {
2815 				port->upcoming_state = SRC_SEND_CAPABILITIES;
2816 				tcpm_ams_start(port, POWER_NEGOTIATION);
2817 			} else {
2818 				tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
2819 			}
2820 			break;
2821 		case DR_SWAP_SEND:
2822 			tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
2823 			break;
2824 		case PR_SWAP_SEND:
2825 			tcpm_set_state(port, PR_SWAP_START, 0);
2826 			break;
2827 		case VCONN_SWAP_SEND:
2828 			tcpm_set_state(port, VCONN_SWAP_START, 0);
2829 			break;
2830 		case FR_SWAP_SEND:
2831 			tcpm_set_state(port, FR_SWAP_SNK_SRC_TRANSITION_TO_OFF, 0);
2832 			break;
2833 		default:
2834 			tcpm_pd_handle_state(port,
2835 					     port->pwr_role == TYPEC_SOURCE ?
2836 					     SRC_SOFT_RESET_WAIT_SNK_TX :
2837 					     SNK_SOFT_RESET,
2838 					     NONE_AMS, 0);
2839 			break;
2840 		}
2841 		break;
2842 	case PD_CTRL_SOFT_RESET:
2843 		port->ams = SOFT_RESET_AMS;
2844 		tcpm_set_state(port, SOFT_RESET, 0);
2845 		break;
2846 	case PD_CTRL_DR_SWAP:
2847 		/*
2848 		 * XXX
2849 		 * 6.3.9: If an alternate mode is active, a request to swap
2850 		 * alternate modes shall trigger a port reset.
2851 		 */
2852 		if (port->typec_caps.data != TYPEC_PORT_DRD) {
2853 			tcpm_pd_handle_msg(port,
2854 					   port->negotiated_rev < PD_REV30 ?
2855 					   PD_MSG_CTRL_REJECT :
2856 					   PD_MSG_CTRL_NOT_SUPP,
2857 					   NONE_AMS);
2858 		} else {
2859 			if (port->send_discover) {
2860 				tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2861 				break;
2862 			}
2863 
2864 			tcpm_pd_handle_state(port, DR_SWAP_ACCEPT, DATA_ROLE_SWAP, 0);
2865 		}
2866 		break;
2867 	case PD_CTRL_PR_SWAP:
2868 		if (port->port_type != TYPEC_PORT_DRP) {
2869 			tcpm_pd_handle_msg(port,
2870 					   port->negotiated_rev < PD_REV30 ?
2871 					   PD_MSG_CTRL_REJECT :
2872 					   PD_MSG_CTRL_NOT_SUPP,
2873 					   NONE_AMS);
2874 		} else {
2875 			if (port->send_discover) {
2876 				tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2877 				break;
2878 			}
2879 
2880 			tcpm_pd_handle_state(port, PR_SWAP_ACCEPT, POWER_ROLE_SWAP, 0);
2881 		}
2882 		break;
2883 	case PD_CTRL_VCONN_SWAP:
2884 		if (port->send_discover) {
2885 			tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2886 			break;
2887 		}
2888 
2889 		tcpm_pd_handle_state(port, VCONN_SWAP_ACCEPT, VCONN_SWAP, 0);
2890 		break;
2891 	case PD_CTRL_GET_SOURCE_CAP_EXT:
2892 	case PD_CTRL_GET_STATUS:
2893 	case PD_CTRL_FR_SWAP:
2894 	case PD_CTRL_GET_PPS_STATUS:
2895 	case PD_CTRL_GET_COUNTRY_CODES:
2896 		/* Currently not supported */
2897 		tcpm_pd_handle_msg(port,
2898 				   port->negotiated_rev < PD_REV30 ?
2899 				   PD_MSG_CTRL_REJECT :
2900 				   PD_MSG_CTRL_NOT_SUPP,
2901 				   NONE_AMS);
2902 		break;
2903 	default:
2904 		tcpm_pd_handle_msg(port,
2905 				   port->negotiated_rev < PD_REV30 ?
2906 				   PD_MSG_CTRL_REJECT :
2907 				   PD_MSG_CTRL_NOT_SUPP,
2908 				   NONE_AMS);
2909 		tcpm_log(port, "Unrecognized ctrl message type %#x", type);
2910 		break;
2911 	}
2912 }
2913 
tcpm_pd_ext_msg_request(struct tcpm_port * port,const struct pd_message * msg)2914 static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
2915 				    const struct pd_message *msg)
2916 {
2917 	enum pd_ext_msg_type type = pd_header_type_le(msg->header);
2918 	unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
2919 
2920 	/* stopping VDM state machine if interrupted by other Messages */
2921 	if (tcpm_vdm_ams(port)) {
2922 		port->vdm_state = VDM_STATE_ERR_BUSY;
2923 		tcpm_ams_finish(port);
2924 		mod_vdm_delayed_work(port, 0);
2925 	}
2926 
2927 	if (!(le16_to_cpu(msg->ext_msg.header) & PD_EXT_HDR_CHUNKED)) {
2928 		tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2929 		tcpm_log(port, "Unchunked extended messages unsupported");
2930 		return;
2931 	}
2932 
2933 	if (data_size > PD_EXT_MAX_CHUNK_DATA) {
2934 		tcpm_pd_handle_state(port, CHUNK_NOT_SUPP, NONE_AMS, PD_T_CHUNK_NOT_SUPP);
2935 		tcpm_log(port, "Chunk handling not yet supported");
2936 		return;
2937 	}
2938 
2939 	switch (type) {
2940 	case PD_EXT_STATUS:
2941 	case PD_EXT_PPS_STATUS:
2942 		if (port->ams == GETTING_SOURCE_SINK_STATUS) {
2943 			tcpm_ams_finish(port);
2944 			tcpm_set_state(port, ready_state(port), 0);
2945 		} else {
2946 			/* unexpected Status or PPS_Status Message */
2947 			tcpm_pd_handle_state(port, port->pwr_role == TYPEC_SOURCE ?
2948 					     SRC_SOFT_RESET_WAIT_SNK_TX : SNK_SOFT_RESET,
2949 					     NONE_AMS, 0);
2950 		}
2951 		break;
2952 	case PD_EXT_SOURCE_CAP_EXT:
2953 	case PD_EXT_GET_BATT_CAP:
2954 	case PD_EXT_GET_BATT_STATUS:
2955 	case PD_EXT_BATT_CAP:
2956 	case PD_EXT_GET_MANUFACTURER_INFO:
2957 	case PD_EXT_MANUFACTURER_INFO:
2958 	case PD_EXT_SECURITY_REQUEST:
2959 	case PD_EXT_SECURITY_RESPONSE:
2960 	case PD_EXT_FW_UPDATE_REQUEST:
2961 	case PD_EXT_FW_UPDATE_RESPONSE:
2962 	case PD_EXT_COUNTRY_INFO:
2963 	case PD_EXT_COUNTRY_CODES:
2964 		tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2965 		break;
2966 	default:
2967 		tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2968 		tcpm_log(port, "Unrecognized extended message type %#x", type);
2969 		break;
2970 	}
2971 }
2972 
tcpm_pd_rx_handler(struct kthread_work * work)2973 static void tcpm_pd_rx_handler(struct kthread_work *work)
2974 {
2975 	struct pd_rx_event *event = container_of(work,
2976 						 struct pd_rx_event, work);
2977 	const struct pd_message *msg = &event->msg;
2978 	unsigned int cnt = pd_header_cnt_le(msg->header);
2979 	struct tcpm_port *port = event->port;
2980 
2981 	mutex_lock(&port->lock);
2982 
2983 	tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
2984 		 port->attached);
2985 
2986 	if (port->attached) {
2987 		enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
2988 		unsigned int msgid = pd_header_msgid_le(msg->header);
2989 
2990 		/*
2991 		 * USB PD standard, 6.6.1.2:
2992 		 * "... if MessageID value in a received Message is the
2993 		 * same as the stored value, the receiver shall return a
2994 		 * GoodCRC Message with that MessageID value and drop
2995 		 * the Message (this is a retry of an already received
2996 		 * Message). Note: this shall not apply to the Soft_Reset
2997 		 * Message which always has a MessageID value of zero."
2998 		 */
2999 		if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
3000 			goto done;
3001 		port->rx_msgid = msgid;
3002 
3003 		/*
3004 		 * If both ends believe to be DFP/host, we have a data role
3005 		 * mismatch.
3006 		 */
3007 		if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
3008 		    (port->data_role == TYPEC_HOST)) {
3009 			tcpm_log(port,
3010 				 "Data role mismatch, initiating error recovery");
3011 			tcpm_set_state(port, ERROR_RECOVERY, 0);
3012 		} else {
3013 			if (le16_to_cpu(msg->header) & PD_HEADER_EXT_HDR)
3014 				tcpm_pd_ext_msg_request(port, msg);
3015 			else if (cnt)
3016 				tcpm_pd_data_request(port, msg);
3017 			else
3018 				tcpm_pd_ctrl_request(port, msg);
3019 		}
3020 	}
3021 
3022 done:
3023 	mutex_unlock(&port->lock);
3024 	kfree(event);
3025 }
3026 
tcpm_pd_receive(struct tcpm_port * port,const struct pd_message * msg)3027 void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
3028 {
3029 	struct pd_rx_event *event;
3030 
3031 	event = kzalloc(sizeof(*event), GFP_ATOMIC);
3032 	if (!event)
3033 		return;
3034 
3035 	kthread_init_work(&event->work, tcpm_pd_rx_handler);
3036 	event->port = port;
3037 	memcpy(&event->msg, msg, sizeof(*msg));
3038 	kthread_queue_work(port->wq, &event->work);
3039 }
3040 EXPORT_SYMBOL_GPL(tcpm_pd_receive);
3041 
tcpm_pd_send_control(struct tcpm_port * port,enum pd_ctrl_msg_type type)3042 static int tcpm_pd_send_control(struct tcpm_port *port,
3043 				enum pd_ctrl_msg_type type)
3044 {
3045 	struct pd_message msg;
3046 
3047 	memset(&msg, 0, sizeof(msg));
3048 	msg.header = PD_HEADER_LE(type, port->pwr_role,
3049 				  port->data_role,
3050 				  port->negotiated_rev,
3051 				  port->message_id, 0);
3052 
3053 	return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3054 }
3055 
3056 /*
3057  * Send queued message without affecting state.
3058  * Return true if state machine should go back to sleep,
3059  * false otherwise.
3060  */
tcpm_send_queued_message(struct tcpm_port * port)3061 static bool tcpm_send_queued_message(struct tcpm_port *port)
3062 {
3063 	enum pd_msg_request queued_message;
3064 	int ret;
3065 
3066 	do {
3067 		queued_message = port->queued_message;
3068 		port->queued_message = PD_MSG_NONE;
3069 
3070 		switch (queued_message) {
3071 		case PD_MSG_CTRL_WAIT:
3072 			tcpm_pd_send_control(port, PD_CTRL_WAIT);
3073 			break;
3074 		case PD_MSG_CTRL_REJECT:
3075 			tcpm_pd_send_control(port, PD_CTRL_REJECT);
3076 			break;
3077 		case PD_MSG_CTRL_NOT_SUPP:
3078 			tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
3079 			break;
3080 		case PD_MSG_DATA_SINK_CAP:
3081 			ret = tcpm_pd_send_sink_caps(port);
3082 			if (ret < 0) {
3083 				tcpm_log(port, "Unable to send snk caps, ret=%d", ret);
3084 				tcpm_set_state(port, SNK_SOFT_RESET, 0);
3085 			}
3086 			tcpm_ams_finish(port);
3087 			break;
3088 		case PD_MSG_DATA_SOURCE_CAP:
3089 			ret = tcpm_pd_send_source_caps(port);
3090 			if (ret < 0) {
3091 				tcpm_log(port,
3092 					 "Unable to send src caps, ret=%d",
3093 					 ret);
3094 				tcpm_set_state(port, SOFT_RESET_SEND, 0);
3095 			} else if (port->pwr_role == TYPEC_SOURCE) {
3096 				tcpm_ams_finish(port);
3097 				tcpm_set_state(port, HARD_RESET_SEND,
3098 					       PD_T_SENDER_RESPONSE);
3099 			} else {
3100 				tcpm_ams_finish(port);
3101 			}
3102 			break;
3103 		default:
3104 			break;
3105 		}
3106 	} while (port->queued_message != PD_MSG_NONE);
3107 
3108 	if (port->delayed_state != INVALID_STATE) {
3109 		if (ktime_after(port->delayed_runtime, ktime_get())) {
3110 			mod_tcpm_delayed_work(port, ktime_to_ms(ktime_sub(port->delayed_runtime,
3111 									  ktime_get())));
3112 			return true;
3113 		}
3114 		port->delayed_state = INVALID_STATE;
3115 	}
3116 	return false;
3117 }
3118 
tcpm_pd_check_request(struct tcpm_port * port)3119 static int tcpm_pd_check_request(struct tcpm_port *port)
3120 {
3121 	u32 pdo, rdo = port->sink_request;
3122 	unsigned int max, op, pdo_max, index;
3123 	enum pd_pdo_type type;
3124 
3125 	index = rdo_index(rdo);
3126 	if (!index || index > port->nr_src_pdo)
3127 		return -EINVAL;
3128 
3129 	pdo = port->src_pdo[index - 1];
3130 	type = pdo_type(pdo);
3131 	switch (type) {
3132 	case PDO_TYPE_FIXED:
3133 	case PDO_TYPE_VAR:
3134 		max = rdo_max_current(rdo);
3135 		op = rdo_op_current(rdo);
3136 		pdo_max = pdo_max_current(pdo);
3137 
3138 		if (op > pdo_max)
3139 			return -EINVAL;
3140 		if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
3141 			return -EINVAL;
3142 
3143 		if (type == PDO_TYPE_FIXED)
3144 			tcpm_log(port,
3145 				 "Requested %u mV, %u mA for %u / %u mA",
3146 				 pdo_fixed_voltage(pdo), pdo_max, op, max);
3147 		else
3148 			tcpm_log(port,
3149 				 "Requested %u -> %u mV, %u mA for %u / %u mA",
3150 				 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
3151 				 pdo_max, op, max);
3152 		break;
3153 	case PDO_TYPE_BATT:
3154 		max = rdo_max_power(rdo);
3155 		op = rdo_op_power(rdo);
3156 		pdo_max = pdo_max_power(pdo);
3157 
3158 		if (op > pdo_max)
3159 			return -EINVAL;
3160 		if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
3161 			return -EINVAL;
3162 		tcpm_log(port,
3163 			 "Requested %u -> %u mV, %u mW for %u / %u mW",
3164 			 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
3165 			 pdo_max, op, max);
3166 		break;
3167 	default:
3168 		return -EINVAL;
3169 	}
3170 
3171 	port->op_vsafe5v = index == 1;
3172 
3173 	return 0;
3174 }
3175 
3176 #define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
3177 #define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
3178 
tcpm_pd_select_pdo(struct tcpm_port * port,int * sink_pdo,int * src_pdo)3179 static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
3180 			      int *src_pdo)
3181 {
3182 	unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
3183 		     max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
3184 		     min_snk_mv = 0;
3185 	int ret = -EINVAL;
3186 
3187 	port->pps_data.supported = false;
3188 	port->usb_type = POWER_SUPPLY_USB_TYPE_PD;
3189 	power_supply_changed(port->psy);
3190 
3191 	/*
3192 	 * Select the source PDO providing the most power which has a
3193 	 * matchig sink cap.
3194 	 */
3195 	for (i = 0; i < port->nr_source_caps; i++) {
3196 		u32 pdo = port->source_caps[i];
3197 		enum pd_pdo_type type = pdo_type(pdo);
3198 
3199 		switch (type) {
3200 		case PDO_TYPE_FIXED:
3201 			max_src_mv = pdo_fixed_voltage(pdo);
3202 			min_src_mv = max_src_mv;
3203 			break;
3204 		case PDO_TYPE_BATT:
3205 		case PDO_TYPE_VAR:
3206 			max_src_mv = pdo_max_voltage(pdo);
3207 			min_src_mv = pdo_min_voltage(pdo);
3208 			break;
3209 		case PDO_TYPE_APDO:
3210 			if (pdo_apdo_type(pdo) == APDO_TYPE_PPS) {
3211 				port->pps_data.supported = true;
3212 				port->usb_type =
3213 					POWER_SUPPLY_USB_TYPE_PD_PPS;
3214 				power_supply_changed(port->psy);
3215 			}
3216 			continue;
3217 		default:
3218 			tcpm_log(port, "Invalid source PDO type, ignoring");
3219 			continue;
3220 		}
3221 
3222 		switch (type) {
3223 		case PDO_TYPE_FIXED:
3224 		case PDO_TYPE_VAR:
3225 			src_ma = pdo_max_current(pdo);
3226 			src_mw = src_ma * min_src_mv / 1000;
3227 			break;
3228 		case PDO_TYPE_BATT:
3229 			src_mw = pdo_max_power(pdo);
3230 			break;
3231 		case PDO_TYPE_APDO:
3232 			continue;
3233 		default:
3234 			tcpm_log(port, "Invalid source PDO type, ignoring");
3235 			continue;
3236 		}
3237 
3238 		for (j = 0; j < port->nr_snk_pdo; j++) {
3239 			pdo = port->snk_pdo[j];
3240 
3241 			switch (pdo_type(pdo)) {
3242 			case PDO_TYPE_FIXED:
3243 				max_snk_mv = pdo_fixed_voltage(pdo);
3244 				min_snk_mv = max_snk_mv;
3245 				break;
3246 			case PDO_TYPE_BATT:
3247 			case PDO_TYPE_VAR:
3248 				max_snk_mv = pdo_max_voltage(pdo);
3249 				min_snk_mv = pdo_min_voltage(pdo);
3250 				break;
3251 			case PDO_TYPE_APDO:
3252 				continue;
3253 			default:
3254 				tcpm_log(port, "Invalid sink PDO type, ignoring");
3255 				continue;
3256 			}
3257 
3258 			if (max_src_mv <= max_snk_mv &&
3259 				min_src_mv >= min_snk_mv) {
3260 				/* Prefer higher voltages if available */
3261 				if ((src_mw == max_mw && min_src_mv > max_mv) ||
3262 							src_mw > max_mw) {
3263 					*src_pdo = i;
3264 					*sink_pdo = j;
3265 					max_mw = src_mw;
3266 					max_mv = min_src_mv;
3267 					ret = 0;
3268 				}
3269 			}
3270 		}
3271 	}
3272 
3273 	return ret;
3274 }
3275 
tcpm_pd_select_pps_apdo(struct tcpm_port * port)3276 static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
3277 {
3278 	unsigned int i, src_ma, max_temp_mw = 0, max_op_ma, op_mw;
3279 	unsigned int src_pdo = 0;
3280 	u32 pdo, src;
3281 
3282 	for (i = 1; i < port->nr_source_caps; ++i) {
3283 		pdo = port->source_caps[i];
3284 
3285 		switch (pdo_type(pdo)) {
3286 		case PDO_TYPE_APDO:
3287 			if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
3288 				tcpm_log(port, "Not PPS APDO (source), ignoring");
3289 				continue;
3290 			}
3291 
3292 			if (port->pps_data.req_out_volt > pdo_pps_apdo_max_voltage(pdo) ||
3293 			    port->pps_data.req_out_volt < pdo_pps_apdo_min_voltage(pdo))
3294 				continue;
3295 
3296 			src_ma = pdo_pps_apdo_max_current(pdo);
3297 			max_op_ma = min(src_ma, port->pps_data.req_op_curr);
3298 			op_mw = max_op_ma * port->pps_data.req_out_volt / 1000;
3299 			if (op_mw > max_temp_mw) {
3300 				src_pdo = i;
3301 				max_temp_mw = op_mw;
3302 			}
3303 			break;
3304 		default:
3305 			tcpm_log(port, "Not APDO type (source), ignoring");
3306 			continue;
3307 		}
3308 	}
3309 
3310 	if (src_pdo) {
3311 		src = port->source_caps[src_pdo];
3312 
3313 		port->pps_data.req_min_volt = pdo_pps_apdo_min_voltage(src);
3314 		port->pps_data.req_max_volt = pdo_pps_apdo_max_voltage(src);
3315 		port->pps_data.req_max_curr = pdo_pps_apdo_max_current(src);
3316 		port->pps_data.req_op_curr = min(port->pps_data.req_max_curr,
3317 						 port->pps_data.req_op_curr);
3318 	}
3319 
3320 	return src_pdo;
3321 }
3322 
tcpm_pd_build_request(struct tcpm_port * port,u32 * rdo)3323 static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
3324 {
3325 	unsigned int mv, ma, mw, flags;
3326 	unsigned int max_ma, max_mw;
3327 	enum pd_pdo_type type;
3328 	u32 pdo, matching_snk_pdo;
3329 	int src_pdo_index = 0;
3330 	int snk_pdo_index = 0;
3331 	int ret;
3332 
3333 	ret = tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index);
3334 	if (ret < 0)
3335 		return ret;
3336 
3337 	pdo = port->source_caps[src_pdo_index];
3338 	matching_snk_pdo = port->snk_pdo[snk_pdo_index];
3339 	type = pdo_type(pdo);
3340 
3341 	switch (type) {
3342 	case PDO_TYPE_FIXED:
3343 		mv = pdo_fixed_voltage(pdo);
3344 		break;
3345 	case PDO_TYPE_BATT:
3346 	case PDO_TYPE_VAR:
3347 		mv = pdo_min_voltage(pdo);
3348 		break;
3349 	default:
3350 		tcpm_log(port, "Invalid PDO selected!");
3351 		return -EINVAL;
3352 	}
3353 
3354 	/* Select maximum available current within the sink pdo's limit */
3355 	if (type == PDO_TYPE_BATT) {
3356 		mw = min_power(pdo, matching_snk_pdo);
3357 		ma = 1000 * mw / mv;
3358 	} else {
3359 		ma = min_current(pdo, matching_snk_pdo);
3360 		mw = ma * mv / 1000;
3361 	}
3362 
3363 	flags = RDO_USB_COMM | RDO_NO_SUSPEND;
3364 
3365 	/* Set mismatch bit if offered power is less than operating power */
3366 	max_ma = ma;
3367 	max_mw = mw;
3368 	if (mw < port->operating_snk_mw) {
3369 		flags |= RDO_CAP_MISMATCH;
3370 		if (type == PDO_TYPE_BATT &&
3371 		    (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
3372 			max_mw = pdo_max_power(matching_snk_pdo);
3373 		else if (pdo_max_current(matching_snk_pdo) >
3374 			 pdo_max_current(pdo))
3375 			max_ma = pdo_max_current(matching_snk_pdo);
3376 	}
3377 
3378 	tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
3379 		 port->cc_req, port->cc1, port->cc2, port->vbus_source,
3380 		 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
3381 		 port->polarity);
3382 
3383 	if (type == PDO_TYPE_BATT) {
3384 		*rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
3385 
3386 		tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
3387 			 src_pdo_index, mv, mw,
3388 			 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
3389 	} else {
3390 		*rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
3391 
3392 		tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
3393 			 src_pdo_index, mv, ma,
3394 			 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
3395 	}
3396 
3397 	port->req_current_limit = ma;
3398 	port->req_supply_voltage = mv;
3399 
3400 	return 0;
3401 }
3402 
tcpm_pd_send_request(struct tcpm_port * port)3403 static int tcpm_pd_send_request(struct tcpm_port *port)
3404 {
3405 	struct pd_message msg;
3406 	int ret;
3407 	u32 rdo;
3408 
3409 	ret = tcpm_pd_build_request(port, &rdo);
3410 	if (ret < 0)
3411 		return ret;
3412 
3413 	/*
3414 	 * Relax the threshold as voltage will be adjusted after Accept Message plus tSrcTransition.
3415 	 * It is safer to modify the threshold here.
3416 	 */
3417 	tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
3418 
3419 	memset(&msg, 0, sizeof(msg));
3420 	msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
3421 				  port->pwr_role,
3422 				  port->data_role,
3423 				  port->negotiated_rev,
3424 				  port->message_id, 1);
3425 	msg.payload[0] = cpu_to_le32(rdo);
3426 
3427 	return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3428 }
3429 
tcpm_pd_build_pps_request(struct tcpm_port * port,u32 * rdo)3430 static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
3431 {
3432 	unsigned int out_mv, op_ma, op_mw, max_mv, max_ma, flags;
3433 	unsigned int src_pdo_index;
3434 
3435 	src_pdo_index = tcpm_pd_select_pps_apdo(port);
3436 	if (!src_pdo_index)
3437 		return -EOPNOTSUPP;
3438 
3439 	max_mv = port->pps_data.req_max_volt;
3440 	max_ma = port->pps_data.req_max_curr;
3441 	out_mv = port->pps_data.req_out_volt;
3442 	op_ma = port->pps_data.req_op_curr;
3443 
3444 	flags = RDO_USB_COMM | RDO_NO_SUSPEND;
3445 
3446 	op_mw = (op_ma * out_mv) / 1000;
3447 	if (op_mw < port->operating_snk_mw) {
3448 		/*
3449 		 * Try raising current to meet power needs. If that's not enough
3450 		 * then try upping the voltage. If that's still not enough
3451 		 * then we've obviously chosen a PPS APDO which really isn't
3452 		 * suitable so abandon ship.
3453 		 */
3454 		op_ma = (port->operating_snk_mw * 1000) / out_mv;
3455 		if ((port->operating_snk_mw * 1000) % out_mv)
3456 			++op_ma;
3457 		op_ma += RDO_PROG_CURR_MA_STEP - (op_ma % RDO_PROG_CURR_MA_STEP);
3458 
3459 		if (op_ma > max_ma) {
3460 			op_ma = max_ma;
3461 			out_mv = (port->operating_snk_mw * 1000) / op_ma;
3462 			if ((port->operating_snk_mw * 1000) % op_ma)
3463 				++out_mv;
3464 			out_mv += RDO_PROG_VOLT_MV_STEP -
3465 				  (out_mv % RDO_PROG_VOLT_MV_STEP);
3466 
3467 			if (out_mv > max_mv) {
3468 				tcpm_log(port, "Invalid PPS APDO selected!");
3469 				return -EINVAL;
3470 			}
3471 		}
3472 	}
3473 
3474 	tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
3475 		 port->cc_req, port->cc1, port->cc2, port->vbus_source,
3476 		 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
3477 		 port->polarity);
3478 
3479 	*rdo = RDO_PROG(src_pdo_index + 1, out_mv, op_ma, flags);
3480 
3481 	tcpm_log(port, "Requesting APDO %d: %u mV, %u mA",
3482 		 src_pdo_index, out_mv, op_ma);
3483 
3484 	port->pps_data.req_op_curr = op_ma;
3485 	port->pps_data.req_out_volt = out_mv;
3486 
3487 	return 0;
3488 }
3489 
tcpm_pd_send_pps_request(struct tcpm_port * port)3490 static int tcpm_pd_send_pps_request(struct tcpm_port *port)
3491 {
3492 	struct pd_message msg;
3493 	int ret;
3494 	u32 rdo;
3495 
3496 	ret = tcpm_pd_build_pps_request(port, &rdo);
3497 	if (ret < 0)
3498 		return ret;
3499 
3500 	/* Relax the threshold as voltage will be adjusted right after Accept Message. */
3501 	tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
3502 
3503 	memset(&msg, 0, sizeof(msg));
3504 	msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
3505 				  port->pwr_role,
3506 				  port->data_role,
3507 				  port->negotiated_rev,
3508 				  port->message_id, 1);
3509 	msg.payload[0] = cpu_to_le32(rdo);
3510 
3511 	return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3512 }
3513 
tcpm_set_vbus(struct tcpm_port * port,bool enable)3514 static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
3515 {
3516 	int ret;
3517 
3518 	if (enable && port->vbus_charge)
3519 		return -EINVAL;
3520 
3521 	tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
3522 
3523 	ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
3524 	if (ret < 0)
3525 		return ret;
3526 
3527 	port->vbus_source = enable;
3528 	return 0;
3529 }
3530 
tcpm_set_charge(struct tcpm_port * port,bool charge)3531 static int tcpm_set_charge(struct tcpm_port *port, bool charge)
3532 {
3533 	int ret;
3534 
3535 	if (charge && port->vbus_source)
3536 		return -EINVAL;
3537 
3538 	if (charge != port->vbus_charge) {
3539 		tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
3540 		ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
3541 					   charge);
3542 		if (ret < 0)
3543 			return ret;
3544 	}
3545 	port->vbus_charge = charge;
3546 	power_supply_changed(port->psy);
3547 	return 0;
3548 }
3549 
tcpm_start_toggling(struct tcpm_port * port,enum typec_cc_status cc)3550 static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status cc)
3551 {
3552 	int ret;
3553 
3554 	if (!port->tcpc->start_toggling)
3555 		return false;
3556 
3557 	tcpm_log_force(port, "Start toggling");
3558 	ret = port->tcpc->start_toggling(port->tcpc, port->port_type, cc);
3559 	return ret == 0;
3560 }
3561 
tcpm_init_vbus(struct tcpm_port * port)3562 static int tcpm_init_vbus(struct tcpm_port *port)
3563 {
3564 	int ret;
3565 
3566 	ret = port->tcpc->set_vbus(port->tcpc, false, false);
3567 	port->vbus_source = false;
3568 	port->vbus_charge = false;
3569 	return ret;
3570 }
3571 
tcpm_init_vconn(struct tcpm_port * port)3572 static int tcpm_init_vconn(struct tcpm_port *port)
3573 {
3574 	int ret;
3575 
3576 	ret = port->tcpc->set_vconn(port->tcpc, false);
3577 	port->vconn_role = TYPEC_SINK;
3578 	return ret;
3579 }
3580 
tcpm_typec_connect(struct tcpm_port * port)3581 static void tcpm_typec_connect(struct tcpm_port *port)
3582 {
3583 	struct typec_partner *partner;
3584 
3585 	if (!port->connected) {
3586 		port->connected = true;
3587 		/* Make sure we don't report stale identity information */
3588 		memset(&port->partner_ident, 0, sizeof(port->partner_ident));
3589 		port->partner_desc.usb_pd = port->pd_capable;
3590 		if (tcpm_port_is_debug(port))
3591 			port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
3592 		else if (tcpm_port_is_audio(port))
3593 			port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
3594 		else
3595 			port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
3596 		partner = typec_register_partner(port->typec_port, &port->partner_desc);
3597 		if (IS_ERR(partner)) {
3598 			dev_err(port->dev, "Failed to register partner (%ld)\n", PTR_ERR(partner));
3599 			return;
3600 		}
3601 
3602 		port->partner = partner;
3603 		typec_partner_set_usb_power_delivery(port->partner, port->partner_pd);
3604 	}
3605 }
3606 
tcpm_src_attach(struct tcpm_port * port)3607 static int tcpm_src_attach(struct tcpm_port *port)
3608 {
3609 	enum typec_cc_polarity polarity =
3610 				port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
3611 							 : TYPEC_POLARITY_CC1;
3612 	int ret;
3613 
3614 	if (port->attached)
3615 		return 0;
3616 
3617 	ret = tcpm_set_polarity(port, polarity);
3618 	if (ret < 0)
3619 		return ret;
3620 
3621 	tcpm_enable_auto_vbus_discharge(port, true);
3622 
3623 	ret = tcpm_set_roles(port, true, TYPEC_SOURCE, tcpm_data_role_for_source(port));
3624 	if (ret < 0)
3625 		return ret;
3626 
3627 	if (port->pd_supported) {
3628 		ret = port->tcpc->set_pd_rx(port->tcpc, true);
3629 		if (ret < 0)
3630 			goto out_disable_mux;
3631 	}
3632 
3633 	/*
3634 	 * USB Type-C specification, version 1.2,
3635 	 * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
3636 	 * Enable VCONN only if the non-RD port is set to RA.
3637 	 */
3638 	if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
3639 	    (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
3640 		ret = tcpm_set_vconn(port, true);
3641 		if (ret < 0)
3642 			goto out_disable_pd;
3643 	}
3644 
3645 	ret = tcpm_set_vbus(port, true);
3646 	if (ret < 0)
3647 		goto out_disable_vconn;
3648 
3649 	port->pd_capable = false;
3650 
3651 	port->partner = NULL;
3652 
3653 	port->attached = true;
3654 	port->send_discover = true;
3655 
3656 	return 0;
3657 
3658 out_disable_vconn:
3659 	tcpm_set_vconn(port, false);
3660 out_disable_pd:
3661 	if (port->pd_supported)
3662 		port->tcpc->set_pd_rx(port->tcpc, false);
3663 out_disable_mux:
3664 	tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
3665 		     TYPEC_ORIENTATION_NONE);
3666 	return ret;
3667 }
3668 
tcpm_typec_disconnect(struct tcpm_port * port)3669 static void tcpm_typec_disconnect(struct tcpm_port *port)
3670 {
3671 	if (port->connected) {
3672 		if (port->partner) {
3673 			typec_partner_set_usb_power_delivery(port->partner, NULL);
3674 			typec_unregister_partner(port->partner);
3675 			port->partner = NULL;
3676 		}
3677 		port->connected = false;
3678 	}
3679 }
3680 
tcpm_unregister_altmodes(struct tcpm_port * port)3681 static void tcpm_unregister_altmodes(struct tcpm_port *port)
3682 {
3683 	struct pd_mode_data *modep = &port->mode_data;
3684 	int i;
3685 
3686 	for (i = 0; i < modep->altmodes; i++) {
3687 		typec_unregister_altmode(port->partner_altmode[i]);
3688 		port->partner_altmode[i] = NULL;
3689 	}
3690 
3691 	memset(modep, 0, sizeof(*modep));
3692 }
3693 
tcpm_set_partner_usb_comm_capable(struct tcpm_port * port,bool capable)3694 static void tcpm_set_partner_usb_comm_capable(struct tcpm_port *port, bool capable)
3695 {
3696 	tcpm_log(port, "Setting usb_comm capable %s", capable ? "true" : "false");
3697 
3698 	if (port->tcpc->set_partner_usb_comm_capable)
3699 		port->tcpc->set_partner_usb_comm_capable(port->tcpc, capable);
3700 }
3701 
tcpm_reset_port(struct tcpm_port * port)3702 static void tcpm_reset_port(struct tcpm_port *port)
3703 {
3704 	tcpm_enable_auto_vbus_discharge(port, false);
3705 	port->in_ams = false;
3706 	port->ams = NONE_AMS;
3707 	port->vdm_sm_running = false;
3708 	tcpm_unregister_altmodes(port);
3709 	tcpm_typec_disconnect(port);
3710 	port->attached = false;
3711 	port->pd_capable = false;
3712 	port->pps_data.supported = false;
3713 	tcpm_set_partner_usb_comm_capable(port, false);
3714 
3715 	/*
3716 	 * First Rx ID should be 0; set this to a sentinel of -1 so that
3717 	 * we can check tcpm_pd_rx_handler() if we had seen it before.
3718 	 */
3719 	port->rx_msgid = -1;
3720 
3721 	port->tcpc->set_pd_rx(port->tcpc, false);
3722 	tcpm_init_vbus(port);	/* also disables charging */
3723 	tcpm_init_vconn(port);
3724 	tcpm_set_current_limit(port, 0, 0);
3725 	tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
3726 	tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
3727 		     TYPEC_ORIENTATION_NONE);
3728 	tcpm_set_attached_state(port, false);
3729 	port->try_src_count = 0;
3730 	port->try_snk_count = 0;
3731 	port->usb_type = POWER_SUPPLY_USB_TYPE_C;
3732 	power_supply_changed(port->psy);
3733 	port->nr_sink_caps = 0;
3734 	port->sink_cap_done = false;
3735 	if (port->tcpc->enable_frs)
3736 		port->tcpc->enable_frs(port->tcpc, false);
3737 
3738 	usb_power_delivery_unregister_capabilities(port->partner_sink_caps);
3739 	port->partner_sink_caps = NULL;
3740 	usb_power_delivery_unregister_capabilities(port->partner_source_caps);
3741 	port->partner_source_caps = NULL;
3742 	usb_power_delivery_unregister(port->partner_pd);
3743 	port->partner_pd = NULL;
3744 }
3745 
tcpm_detach(struct tcpm_port * port)3746 static void tcpm_detach(struct tcpm_port *port)
3747 {
3748 	if (tcpm_port_is_disconnected(port))
3749 		port->hard_reset_count = 0;
3750 
3751 	if (!port->attached)
3752 		return;
3753 
3754 	if (port->tcpc->set_bist_data) {
3755 		tcpm_log(port, "disable BIST MODE TESTDATA");
3756 		port->tcpc->set_bist_data(port->tcpc, false);
3757 	}
3758 
3759 	tcpm_reset_port(port);
3760 }
3761 
tcpm_src_detach(struct tcpm_port * port)3762 static void tcpm_src_detach(struct tcpm_port *port)
3763 {
3764 	tcpm_detach(port);
3765 }
3766 
tcpm_snk_attach(struct tcpm_port * port)3767 static int tcpm_snk_attach(struct tcpm_port *port)
3768 {
3769 	int ret;
3770 
3771 	if (port->attached)
3772 		return 0;
3773 
3774 	ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
3775 				TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
3776 	if (ret < 0)
3777 		return ret;
3778 
3779 	tcpm_enable_auto_vbus_discharge(port, true);
3780 
3781 	ret = tcpm_set_roles(port, true, TYPEC_SINK, tcpm_data_role_for_sink(port));
3782 	if (ret < 0)
3783 		return ret;
3784 
3785 	port->pd_capable = false;
3786 
3787 	port->partner = NULL;
3788 
3789 	port->attached = true;
3790 	port->send_discover = true;
3791 
3792 	return 0;
3793 }
3794 
tcpm_snk_detach(struct tcpm_port * port)3795 static void tcpm_snk_detach(struct tcpm_port *port)
3796 {
3797 	tcpm_detach(port);
3798 }
3799 
tcpm_acc_attach(struct tcpm_port * port)3800 static int tcpm_acc_attach(struct tcpm_port *port)
3801 {
3802 	int ret;
3803 
3804 	if (port->attached)
3805 		return 0;
3806 
3807 	ret = tcpm_set_roles(port, true, TYPEC_SOURCE,
3808 			     tcpm_data_role_for_source(port));
3809 	if (ret < 0)
3810 		return ret;
3811 
3812 	port->partner = NULL;
3813 
3814 	tcpm_typec_connect(port);
3815 
3816 	port->attached = true;
3817 
3818 	return 0;
3819 }
3820 
tcpm_acc_detach(struct tcpm_port * port)3821 static void tcpm_acc_detach(struct tcpm_port *port)
3822 {
3823 	tcpm_detach(port);
3824 }
3825 
hard_reset_state(struct tcpm_port * port)3826 static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
3827 {
3828 	if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
3829 		return HARD_RESET_SEND;
3830 	if (port->pd_capable)
3831 		return ERROR_RECOVERY;
3832 	if (port->pwr_role == TYPEC_SOURCE)
3833 		return SRC_UNATTACHED;
3834 	if (port->state == SNK_WAIT_CAPABILITIES)
3835 		return SNK_READY;
3836 	return SNK_UNATTACHED;
3837 }
3838 
unattached_state(struct tcpm_port * port)3839 static inline enum tcpm_state unattached_state(struct tcpm_port *port)
3840 {
3841 	if (port->port_type == TYPEC_PORT_DRP) {
3842 		if (port->pwr_role == TYPEC_SOURCE)
3843 			return SRC_UNATTACHED;
3844 		else
3845 			return SNK_UNATTACHED;
3846 	} else if (port->port_type == TYPEC_PORT_SRC) {
3847 		return SRC_UNATTACHED;
3848 	}
3849 
3850 	return SNK_UNATTACHED;
3851 }
3852 
tcpm_swap_complete(struct tcpm_port * port,int result)3853 static void tcpm_swap_complete(struct tcpm_port *port, int result)
3854 {
3855 	if (port->swap_pending) {
3856 		port->swap_status = result;
3857 		port->swap_pending = false;
3858 		port->non_pd_role_swap = false;
3859 		complete(&port->swap_complete);
3860 	}
3861 }
3862 
tcpm_get_pwr_opmode(enum typec_cc_status cc)3863 static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
3864 {
3865 	switch (cc) {
3866 	case TYPEC_CC_RP_1_5:
3867 		return TYPEC_PWR_MODE_1_5A;
3868 	case TYPEC_CC_RP_3_0:
3869 		return TYPEC_PWR_MODE_3_0A;
3870 	case TYPEC_CC_RP_DEF:
3871 	default:
3872 		return TYPEC_PWR_MODE_USB;
3873 	}
3874 }
3875 
tcpm_pwr_opmode_to_rp(enum typec_pwr_opmode opmode)3876 static enum typec_cc_status tcpm_pwr_opmode_to_rp(enum typec_pwr_opmode opmode)
3877 {
3878 	switch (opmode) {
3879 	case TYPEC_PWR_MODE_USB:
3880 		return TYPEC_CC_RP_DEF;
3881 	case TYPEC_PWR_MODE_1_5A:
3882 		return TYPEC_CC_RP_1_5;
3883 	case TYPEC_PWR_MODE_3_0A:
3884 	case TYPEC_PWR_MODE_PD:
3885 	default:
3886 		return TYPEC_CC_RP_3_0;
3887 	}
3888 }
3889 
tcpm_set_initial_svdm_version(struct tcpm_port * port)3890 static void tcpm_set_initial_svdm_version(struct tcpm_port *port)
3891 {
3892 	if (!port->partner)
3893 		return;
3894 
3895 	switch (port->negotiated_rev) {
3896 	case PD_REV30:
3897 		break;
3898 	/*
3899 	 * 6.4.4.2.3 Structured VDM Version
3900 	 * 2.0 states "At this time, there is only one version (1.0) defined.
3901 	 * This field Shall be set to zero to indicate Version 1.0."
3902 	 * 3.0 states "This field Shall be set to 01b to indicate Version 2.0."
3903 	 * To ensure that we follow the Power Delivery revision we are currently
3904 	 * operating on, downgrade the SVDM version to the highest one supported
3905 	 * by the Power Delivery revision.
3906 	 */
3907 	case PD_REV20:
3908 		typec_partner_set_svdm_version(port->partner, SVDM_VER_1_0);
3909 		break;
3910 	default:
3911 		typec_partner_set_svdm_version(port->partner, SVDM_VER_1_0);
3912 		break;
3913 	}
3914 }
3915 
run_state_machine(struct tcpm_port * port)3916 static void run_state_machine(struct tcpm_port *port)
3917 {
3918 	int ret;
3919 	enum typec_pwr_opmode opmode;
3920 	unsigned int msecs;
3921 	enum tcpm_state upcoming_state;
3922 
3923 	if (port->tcpc->check_contaminant && port->state != CHECK_CONTAMINANT)
3924 		port->potential_contaminant = ((port->enter_state == SRC_ATTACH_WAIT &&
3925 						port->state == SRC_UNATTACHED) ||
3926 					       (port->enter_state == SNK_ATTACH_WAIT &&
3927 						port->state == SNK_UNATTACHED) ||
3928 					       (port->enter_state == SNK_DEBOUNCED &&
3929 						port->state == SNK_UNATTACHED));
3930 
3931 	port->enter_state = port->state;
3932 	switch (port->state) {
3933 	case TOGGLING:
3934 		break;
3935 	case CHECK_CONTAMINANT:
3936 		port->tcpc->check_contaminant(port->tcpc);
3937 		break;
3938 	/* SRC states */
3939 	case SRC_UNATTACHED:
3940 		if (!port->non_pd_role_swap)
3941 			tcpm_swap_complete(port, -ENOTCONN);
3942 		tcpm_src_detach(port);
3943 		if (port->potential_contaminant) {
3944 			tcpm_set_state(port, CHECK_CONTAMINANT, 0);
3945 			break;
3946 		}
3947 		if (tcpm_start_toggling(port, tcpm_rp_cc(port))) {
3948 			tcpm_set_state(port, TOGGLING, 0);
3949 			break;
3950 		}
3951 		tcpm_set_cc(port, tcpm_rp_cc(port));
3952 		if (port->port_type == TYPEC_PORT_DRP)
3953 			tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
3954 		break;
3955 	case SRC_ATTACH_WAIT:
3956 		if (tcpm_port_is_debug(port))
3957 			tcpm_set_state(port, DEBUG_ACC_ATTACHED,
3958 				       PD_T_CC_DEBOUNCE);
3959 		else if (tcpm_port_is_audio(port))
3960 			tcpm_set_state(port, AUDIO_ACC_ATTACHED,
3961 				       PD_T_CC_DEBOUNCE);
3962 		else if (tcpm_port_is_source(port) && port->vbus_vsafe0v)
3963 			tcpm_set_state(port,
3964 				       tcpm_try_snk(port) ? SNK_TRY
3965 							  : SRC_ATTACHED,
3966 				       PD_T_CC_DEBOUNCE);
3967 		break;
3968 
3969 	case SNK_TRY:
3970 		port->try_snk_count++;
3971 		/*
3972 		 * Requirements:
3973 		 * - Do not drive vconn or vbus
3974 		 * - Terminate CC pins (both) to Rd
3975 		 * Action:
3976 		 * - Wait for tDRPTry (PD_T_DRP_TRY).
3977 		 *   Until then, ignore any state changes.
3978 		 */
3979 		tcpm_set_cc(port, TYPEC_CC_RD);
3980 		tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
3981 		break;
3982 	case SNK_TRY_WAIT:
3983 		if (tcpm_port_is_sink(port)) {
3984 			tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
3985 		} else {
3986 			tcpm_set_state(port, SRC_TRYWAIT, 0);
3987 			port->max_wait = 0;
3988 		}
3989 		break;
3990 	case SNK_TRY_WAIT_DEBOUNCE:
3991 		tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
3992 			       PD_T_TRY_CC_DEBOUNCE);
3993 		break;
3994 	case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
3995 		if (port->vbus_present && tcpm_port_is_sink(port))
3996 			tcpm_set_state(port, SNK_ATTACHED, 0);
3997 		else
3998 			port->max_wait = 0;
3999 		break;
4000 	case SRC_TRYWAIT:
4001 		tcpm_set_cc(port, tcpm_rp_cc(port));
4002 		if (port->max_wait == 0) {
4003 			port->max_wait = jiffies +
4004 					 msecs_to_jiffies(PD_T_DRP_TRY);
4005 			tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
4006 				       PD_T_DRP_TRY);
4007 		} else {
4008 			if (time_is_after_jiffies(port->max_wait))
4009 				tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
4010 					       jiffies_to_msecs(port->max_wait -
4011 								jiffies));
4012 			else
4013 				tcpm_set_state(port, SNK_UNATTACHED, 0);
4014 		}
4015 		break;
4016 	case SRC_TRYWAIT_DEBOUNCE:
4017 		tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
4018 		break;
4019 	case SRC_TRYWAIT_UNATTACHED:
4020 		tcpm_set_state(port, SNK_UNATTACHED, 0);
4021 		break;
4022 
4023 	case SRC_ATTACHED:
4024 		ret = tcpm_src_attach(port);
4025 		tcpm_set_state(port, SRC_UNATTACHED,
4026 			       ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
4027 		break;
4028 	case SRC_STARTUP:
4029 		opmode =  tcpm_get_pwr_opmode(tcpm_rp_cc(port));
4030 		typec_set_pwr_opmode(port->typec_port, opmode);
4031 		port->pwr_opmode = TYPEC_PWR_MODE_USB;
4032 		port->caps_count = 0;
4033 		port->negotiated_rev = PD_MAX_REV;
4034 		port->message_id = 0;
4035 		port->rx_msgid = -1;
4036 		port->explicit_contract = false;
4037 		/* SNK -> SRC POWER/FAST_ROLE_SWAP finished */
4038 		if (port->ams == POWER_ROLE_SWAP ||
4039 		    port->ams == FAST_ROLE_SWAP)
4040 			tcpm_ams_finish(port);
4041 		if (!port->pd_supported) {
4042 			tcpm_set_state(port, SRC_READY, 0);
4043 			break;
4044 		}
4045 		port->upcoming_state = SRC_SEND_CAPABILITIES;
4046 		tcpm_ams_start(port, POWER_NEGOTIATION);
4047 		break;
4048 	case SRC_SEND_CAPABILITIES:
4049 		port->caps_count++;
4050 		if (port->caps_count > PD_N_CAPS_COUNT) {
4051 			tcpm_set_state(port, SRC_READY, 0);
4052 			break;
4053 		}
4054 		ret = tcpm_pd_send_source_caps(port);
4055 		if (ret < 0) {
4056 			tcpm_set_state(port, SRC_SEND_CAPABILITIES,
4057 				       PD_T_SEND_SOURCE_CAP);
4058 		} else {
4059 			/*
4060 			 * Per standard, we should clear the reset counter here.
4061 			 * However, that can result in state machine hang-ups.
4062 			 * Reset it only in READY state to improve stability.
4063 			 */
4064 			/* port->hard_reset_count = 0; */
4065 			port->caps_count = 0;
4066 			port->pd_capable = true;
4067 			tcpm_set_state_cond(port, SRC_SEND_CAPABILITIES_TIMEOUT,
4068 					    PD_T_SEND_SOURCE_CAP);
4069 		}
4070 		break;
4071 	case SRC_SEND_CAPABILITIES_TIMEOUT:
4072 		/*
4073 		 * Error recovery for a PD_DATA_SOURCE_CAP reply timeout.
4074 		 *
4075 		 * PD 2.0 sinks are supposed to accept src-capabilities with a
4076 		 * 3.0 header and simply ignore any src PDOs which the sink does
4077 		 * not understand such as PPS but some 2.0 sinks instead ignore
4078 		 * the entire PD_DATA_SOURCE_CAP message, causing contract
4079 		 * negotiation to fail.
4080 		 *
4081 		 * After PD_N_HARD_RESET_COUNT hard-reset attempts, we try
4082 		 * sending src-capabilities with a lower PD revision to
4083 		 * make these broken sinks work.
4084 		 */
4085 		if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) {
4086 			tcpm_set_state(port, HARD_RESET_SEND, 0);
4087 		} else if (port->negotiated_rev > PD_REV20) {
4088 			port->negotiated_rev--;
4089 			port->hard_reset_count = 0;
4090 			tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
4091 		} else {
4092 			tcpm_set_state(port, hard_reset_state(port), 0);
4093 		}
4094 		break;
4095 	case SRC_NEGOTIATE_CAPABILITIES:
4096 		ret = tcpm_pd_check_request(port);
4097 		if (ret < 0) {
4098 			tcpm_pd_send_control(port, PD_CTRL_REJECT);
4099 			if (!port->explicit_contract) {
4100 				tcpm_set_state(port,
4101 					       SRC_WAIT_NEW_CAPABILITIES, 0);
4102 			} else {
4103 				tcpm_set_state(port, SRC_READY, 0);
4104 			}
4105 		} else {
4106 			tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4107 			tcpm_set_partner_usb_comm_capable(port,
4108 							  !!(port->sink_request & RDO_USB_COMM));
4109 			tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
4110 				       PD_T_SRC_TRANSITION);
4111 		}
4112 		break;
4113 	case SRC_TRANSITION_SUPPLY:
4114 		/* XXX: regulator_set_voltage(vbus, ...) */
4115 		tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4116 		port->explicit_contract = true;
4117 		typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
4118 		port->pwr_opmode = TYPEC_PWR_MODE_PD;
4119 		tcpm_set_state_cond(port, SRC_READY, 0);
4120 		break;
4121 	case SRC_READY:
4122 #if 1
4123 		port->hard_reset_count = 0;
4124 #endif
4125 		port->try_src_count = 0;
4126 
4127 		tcpm_swap_complete(port, 0);
4128 		tcpm_typec_connect(port);
4129 
4130 		if (port->ams != NONE_AMS)
4131 			tcpm_ams_finish(port);
4132 		if (port->next_ams != NONE_AMS) {
4133 			port->ams = port->next_ams;
4134 			port->next_ams = NONE_AMS;
4135 		}
4136 
4137 		/*
4138 		 * If previous AMS is interrupted, switch to the upcoming
4139 		 * state.
4140 		 */
4141 		if (port->upcoming_state != INVALID_STATE) {
4142 			upcoming_state = port->upcoming_state;
4143 			port->upcoming_state = INVALID_STATE;
4144 			tcpm_set_state(port, upcoming_state, 0);
4145 			break;
4146 		}
4147 
4148 		/*
4149 		 * 6.4.4.3.1 Discover Identity
4150 		 * "The Discover Identity Command Shall only be sent to SOP when there is an
4151 		 * Explicit Contract."
4152 		 * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using
4153 		 * port->explicit_contract to decide whether to send the command.
4154 		 */
4155 		if (port->explicit_contract) {
4156 			tcpm_set_initial_svdm_version(port);
4157 			mod_send_discover_delayed_work(port, 0);
4158 		} else {
4159 			port->send_discover = false;
4160 		}
4161 
4162 		/*
4163 		 * 6.3.5
4164 		 * Sending ping messages is not necessary if
4165 		 * - the source operates at vSafe5V
4166 		 * or
4167 		 * - The system is not operating in PD mode
4168 		 * or
4169 		 * - Both partners are connected using a Type-C connector
4170 		 *
4171 		 * There is no actual need to send PD messages since the local
4172 		 * port type-c and the spec does not clearly say whether PD is
4173 		 * possible when type-c is connected to Type-A/B
4174 		 */
4175 		break;
4176 	case SRC_WAIT_NEW_CAPABILITIES:
4177 		/* Nothing to do... */
4178 		break;
4179 
4180 	/* SNK states */
4181 	case SNK_UNATTACHED:
4182 		if (!port->non_pd_role_swap)
4183 			tcpm_swap_complete(port, -ENOTCONN);
4184 		tcpm_pps_complete(port, -ENOTCONN);
4185 		tcpm_snk_detach(port);
4186 		if (port->potential_contaminant) {
4187 			tcpm_set_state(port, CHECK_CONTAMINANT, 0);
4188 			break;
4189 		}
4190 		if (tcpm_start_toggling(port, TYPEC_CC_RD)) {
4191 			tcpm_set_state(port, TOGGLING, 0);
4192 			break;
4193 		}
4194 		tcpm_set_cc(port, TYPEC_CC_RD);
4195 		if (port->port_type == TYPEC_PORT_DRP)
4196 			tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
4197 		break;
4198 	case SNK_ATTACH_WAIT:
4199 		if ((port->cc1 == TYPEC_CC_OPEN &&
4200 		     port->cc2 != TYPEC_CC_OPEN) ||
4201 		    (port->cc1 != TYPEC_CC_OPEN &&
4202 		     port->cc2 == TYPEC_CC_OPEN))
4203 			tcpm_set_state(port, SNK_DEBOUNCED,
4204 				       PD_T_CC_DEBOUNCE);
4205 		else if (tcpm_port_is_disconnected(port))
4206 			tcpm_set_state(port, SNK_UNATTACHED,
4207 				       PD_T_PD_DEBOUNCE);
4208 		break;
4209 	case SNK_DEBOUNCED:
4210 		if (tcpm_port_is_disconnected(port))
4211 			tcpm_set_state(port, SNK_UNATTACHED,
4212 				       PD_T_PD_DEBOUNCE);
4213 		else if (port->vbus_present)
4214 			tcpm_set_state(port,
4215 				       tcpm_try_src(port) ? SRC_TRY
4216 							  : SNK_ATTACHED,
4217 				       0);
4218 		break;
4219 	case SRC_TRY:
4220 		port->try_src_count++;
4221 		tcpm_set_cc(port, tcpm_rp_cc(port));
4222 		port->max_wait = 0;
4223 		tcpm_set_state(port, SRC_TRY_WAIT, 0);
4224 		break;
4225 	case SRC_TRY_WAIT:
4226 		if (port->max_wait == 0) {
4227 			port->max_wait = jiffies +
4228 					 msecs_to_jiffies(PD_T_DRP_TRY);
4229 			msecs = PD_T_DRP_TRY;
4230 		} else {
4231 			if (time_is_after_jiffies(port->max_wait))
4232 				msecs = jiffies_to_msecs(port->max_wait -
4233 							 jiffies);
4234 			else
4235 				msecs = 0;
4236 		}
4237 		tcpm_set_state(port, SNK_TRYWAIT, msecs);
4238 		break;
4239 	case SRC_TRY_DEBOUNCE:
4240 		tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
4241 		break;
4242 	case SNK_TRYWAIT:
4243 		tcpm_set_cc(port, TYPEC_CC_RD);
4244 		tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
4245 		break;
4246 	case SNK_TRYWAIT_VBUS:
4247 		/*
4248 		 * TCPM stays in this state indefinitely until VBUS
4249 		 * is detected as long as Rp is not detected for
4250 		 * more than a time period of tPDDebounce.
4251 		 */
4252 		if (port->vbus_present && tcpm_port_is_sink(port)) {
4253 			tcpm_set_state(port, SNK_ATTACHED, 0);
4254 			break;
4255 		}
4256 		if (!tcpm_port_is_sink(port))
4257 			tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
4258 		break;
4259 	case SNK_TRYWAIT_DEBOUNCE:
4260 		tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
4261 		break;
4262 	case SNK_ATTACHED:
4263 		ret = tcpm_snk_attach(port);
4264 		if (ret < 0)
4265 			tcpm_set_state(port, SNK_UNATTACHED, 0);
4266 		else
4267 			tcpm_set_state(port, SNK_STARTUP, 0);
4268 		break;
4269 	case SNK_STARTUP:
4270 		opmode =  tcpm_get_pwr_opmode(port->polarity ?
4271 					      port->cc2 : port->cc1);
4272 		typec_set_pwr_opmode(port->typec_port, opmode);
4273 		port->pwr_opmode = TYPEC_PWR_MODE_USB;
4274 		port->negotiated_rev = PD_MAX_REV;
4275 		port->message_id = 0;
4276 		port->rx_msgid = -1;
4277 		port->explicit_contract = false;
4278 
4279 		if (port->ams == POWER_ROLE_SWAP ||
4280 		    port->ams == FAST_ROLE_SWAP)
4281 			/* SRC -> SNK POWER/FAST_ROLE_SWAP finished */
4282 			tcpm_ams_finish(port);
4283 
4284 		tcpm_set_state(port, SNK_DISCOVERY, 0);
4285 		break;
4286 	case SNK_DISCOVERY:
4287 		if (port->vbus_present) {
4288 			u32 current_lim = tcpm_get_current_limit(port);
4289 
4290 			if (port->slow_charger_loop && (current_lim > PD_P_SNK_STDBY_MW / 5))
4291 				current_lim = PD_P_SNK_STDBY_MW / 5;
4292 			tcpm_set_current_limit(port, current_lim, 5000);
4293 			/* Not sink vbus if operational current is 0mA */
4294 			tcpm_set_charge(port, !port->pd_supported ||
4295 					pdo_max_current(port->snk_pdo[0]));
4296 
4297 			if (!port->pd_supported)
4298 				tcpm_set_state(port, SNK_READY, 0);
4299 			else
4300 				tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4301 			break;
4302 		}
4303 		/*
4304 		 * For DRP, timeouts differ. Also, handling is supposed to be
4305 		 * different and much more complex (dead battery detection;
4306 		 * see USB power delivery specification, section 8.3.3.6.1.5.1).
4307 		 */
4308 		tcpm_set_state(port, hard_reset_state(port),
4309 			       port->port_type == TYPEC_PORT_DRP ?
4310 					PD_T_DB_DETECT : PD_T_NO_RESPONSE);
4311 		break;
4312 	case SNK_DISCOVERY_DEBOUNCE:
4313 		tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
4314 			       PD_T_CC_DEBOUNCE);
4315 		break;
4316 	case SNK_DISCOVERY_DEBOUNCE_DONE:
4317 		if (!tcpm_port_is_disconnected(port) &&
4318 		    tcpm_port_is_sink(port) &&
4319 		    ktime_after(port->delayed_runtime, ktime_get())) {
4320 			tcpm_set_state(port, SNK_DISCOVERY,
4321 				       ktime_to_ms(ktime_sub(port->delayed_runtime, ktime_get())));
4322 			break;
4323 		}
4324 		tcpm_set_state(port, unattached_state(port), 0);
4325 		break;
4326 	case SNK_WAIT_CAPABILITIES:
4327 		ret = port->tcpc->set_pd_rx(port->tcpc, true);
4328 		if (ret < 0) {
4329 			tcpm_set_state(port, SNK_READY, 0);
4330 			break;
4331 		}
4332 		/*
4333 		 * If VBUS has never been low, and we time out waiting
4334 		 * for source cap, try a soft reset first, in case we
4335 		 * were already in a stable contract before this boot.
4336 		 * Do this only once.
4337 		 */
4338 		if (port->vbus_never_low) {
4339 			port->vbus_never_low = false;
4340 			tcpm_set_state(port, SNK_SOFT_RESET,
4341 				       PD_T_SINK_WAIT_CAP);
4342 		} else {
4343 			tcpm_set_state(port, hard_reset_state(port),
4344 				       PD_T_SINK_WAIT_CAP);
4345 		}
4346 		break;
4347 	case SNK_NEGOTIATE_CAPABILITIES:
4348 		port->pd_capable = true;
4349 		tcpm_set_partner_usb_comm_capable(port,
4350 						  !!(port->source_caps[0] & PDO_FIXED_USB_COMM));
4351 		port->hard_reset_count = 0;
4352 		ret = tcpm_pd_send_request(port);
4353 		if (ret < 0) {
4354 			/* Restore back to the original state */
4355 			tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
4356 							       port->pps_data.active,
4357 							       port->supply_voltage);
4358 			/* Let the Source send capabilities again. */
4359 			tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4360 		} else {
4361 			tcpm_set_state_cond(port, hard_reset_state(port),
4362 					    PD_T_SENDER_RESPONSE);
4363 		}
4364 		break;
4365 	case SNK_NEGOTIATE_PPS_CAPABILITIES:
4366 		ret = tcpm_pd_send_pps_request(port);
4367 		if (ret < 0) {
4368 			/* Restore back to the original state */
4369 			tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
4370 							       port->pps_data.active,
4371 							       port->supply_voltage);
4372 			port->pps_status = ret;
4373 			/*
4374 			 * If this was called due to updates to sink
4375 			 * capabilities, and pps is no longer valid, we should
4376 			 * safely fall back to a standard PDO.
4377 			 */
4378 			if (port->update_sink_caps)
4379 				tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
4380 			else
4381 				tcpm_set_state(port, SNK_READY, 0);
4382 		} else {
4383 			tcpm_set_state_cond(port, hard_reset_state(port),
4384 					    PD_T_SENDER_RESPONSE);
4385 		}
4386 		break;
4387 	case SNK_TRANSITION_SINK:
4388 		/* From the USB PD spec:
4389 		 * "The Sink Shall transition to Sink Standby before a positive or
4390 		 * negative voltage transition of VBUS. During Sink Standby
4391 		 * the Sink Shall reduce its power draw to pSnkStdby."
4392 		 *
4393 		 * This is not applicable to PPS though as the port can continue
4394 		 * to draw negotiated power without switching to standby.
4395 		 */
4396 		if (port->supply_voltage != port->req_supply_voltage && !port->pps_data.active &&
4397 		    port->current_limit * port->supply_voltage / 1000 > PD_P_SNK_STDBY_MW) {
4398 			u32 stdby_ma = PD_P_SNK_STDBY_MW * 1000 / port->supply_voltage;
4399 
4400 			tcpm_log(port, "Setting standby current %u mV @ %u mA",
4401 				 port->supply_voltage, stdby_ma);
4402 			tcpm_set_current_limit(port, stdby_ma, port->supply_voltage);
4403 		}
4404 		fallthrough;
4405 	case SNK_TRANSITION_SINK_VBUS:
4406 		tcpm_set_state(port, hard_reset_state(port),
4407 			       PD_T_PS_TRANSITION);
4408 		break;
4409 	case SNK_READY:
4410 		port->try_snk_count = 0;
4411 		port->update_sink_caps = false;
4412 		if (port->explicit_contract) {
4413 			typec_set_pwr_opmode(port->typec_port,
4414 					     TYPEC_PWR_MODE_PD);
4415 			port->pwr_opmode = TYPEC_PWR_MODE_PD;
4416 		}
4417 
4418 		if (!port->pd_capable && port->slow_charger_loop)
4419 			tcpm_set_current_limit(port, tcpm_get_current_limit(port), 5000);
4420 		tcpm_swap_complete(port, 0);
4421 		tcpm_typec_connect(port);
4422 		mod_enable_frs_delayed_work(port, 0);
4423 		tcpm_pps_complete(port, port->pps_status);
4424 
4425 		if (port->ams != NONE_AMS)
4426 			tcpm_ams_finish(port);
4427 		if (port->next_ams != NONE_AMS) {
4428 			port->ams = port->next_ams;
4429 			port->next_ams = NONE_AMS;
4430 		}
4431 
4432 		/*
4433 		 * If previous AMS is interrupted, switch to the upcoming
4434 		 * state.
4435 		 */
4436 		if (port->upcoming_state != INVALID_STATE) {
4437 			upcoming_state = port->upcoming_state;
4438 			port->upcoming_state = INVALID_STATE;
4439 			tcpm_set_state(port, upcoming_state, 0);
4440 			break;
4441 		}
4442 
4443 		/*
4444 		 * 6.4.4.3.1 Discover Identity
4445 		 * "The Discover Identity Command Shall only be sent to SOP when there is an
4446 		 * Explicit Contract."
4447 		 * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using
4448 		 * port->explicit_contract.
4449 		 */
4450 		if (port->explicit_contract) {
4451 			tcpm_set_initial_svdm_version(port);
4452 			mod_send_discover_delayed_work(port, 0);
4453 		} else {
4454 			port->send_discover = false;
4455 		}
4456 
4457 		power_supply_changed(port->psy);
4458 		break;
4459 
4460 	/* Accessory states */
4461 	case ACC_UNATTACHED:
4462 		tcpm_acc_detach(port);
4463 		tcpm_set_state(port, SRC_UNATTACHED, 0);
4464 		break;
4465 	case DEBUG_ACC_ATTACHED:
4466 	case AUDIO_ACC_ATTACHED:
4467 		ret = tcpm_acc_attach(port);
4468 		if (ret < 0)
4469 			tcpm_set_state(port, ACC_UNATTACHED, 0);
4470 		break;
4471 	case AUDIO_ACC_DEBOUNCE:
4472 		tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
4473 		break;
4474 
4475 	/* Hard_Reset states */
4476 	case HARD_RESET_SEND:
4477 		if (port->ams != NONE_AMS)
4478 			tcpm_ams_finish(port);
4479 		/*
4480 		 * State machine will be directed to HARD_RESET_START,
4481 		 * thus set upcoming_state to INVALID_STATE.
4482 		 */
4483 		port->upcoming_state = INVALID_STATE;
4484 		tcpm_ams_start(port, HARD_RESET);
4485 		break;
4486 	case HARD_RESET_START:
4487 		port->sink_cap_done = false;
4488 		if (port->tcpc->enable_frs)
4489 			port->tcpc->enable_frs(port->tcpc, false);
4490 		port->hard_reset_count++;
4491 		port->tcpc->set_pd_rx(port->tcpc, false);
4492 		tcpm_unregister_altmodes(port);
4493 		port->nr_sink_caps = 0;
4494 		port->send_discover = true;
4495 		if (port->pwr_role == TYPEC_SOURCE)
4496 			tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
4497 				       PD_T_PS_HARD_RESET);
4498 		else
4499 			tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
4500 		break;
4501 	case SRC_HARD_RESET_VBUS_OFF:
4502 		/*
4503 		 * 7.1.5 Response to Hard Resets
4504 		 * Hard Reset Signaling indicates a communication failure has occurred and the
4505 		 * Source Shall stop driving VCONN, Shall remove Rp from the VCONN pin and Shall
4506 		 * drive VBUS to vSafe0V as shown in Figure 7-9.
4507 		 */
4508 		tcpm_set_vconn(port, false);
4509 		tcpm_set_vbus(port, false);
4510 		tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
4511 			       tcpm_data_role_for_source(port));
4512 		/*
4513 		 * If tcpc fails to notify vbus off, TCPM will wait for PD_T_SAFE_0V +
4514 		 * PD_T_SRC_RECOVER before turning vbus back on.
4515 		 * From Table 7-12 Sequence Description for a Source Initiated Hard Reset:
4516 		 * 4. Policy Engine waits tPSHardReset after sending Hard Reset Signaling and then
4517 		 * tells the Device Policy Manager to instruct the power supply to perform a
4518 		 * Hard Reset. The transition to vSafe0V Shall occur within tSafe0V (t2).
4519 		 * 5. After tSrcRecover the Source applies power to VBUS in an attempt to
4520 		 * re-establish communication with the Sink and resume USB Default Operation.
4521 		 * The transition to vSafe5V Shall occur within tSrcTurnOn(t4).
4522 		 */
4523 		tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SAFE_0V + PD_T_SRC_RECOVER);
4524 		break;
4525 	case SRC_HARD_RESET_VBUS_ON:
4526 		tcpm_set_vconn(port, true);
4527 		tcpm_set_vbus(port, true);
4528 		if (port->ams == HARD_RESET)
4529 			tcpm_ams_finish(port);
4530 		if (port->pd_supported)
4531 			port->tcpc->set_pd_rx(port->tcpc, true);
4532 		tcpm_set_attached_state(port, true);
4533 		tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
4534 		break;
4535 	case SNK_HARD_RESET_SINK_OFF:
4536 		/* Do not discharge/disconnect during hard reseet */
4537 		tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
4538 		memset(&port->pps_data, 0, sizeof(port->pps_data));
4539 		tcpm_set_vconn(port, false);
4540 		if (port->pd_capable)
4541 			tcpm_set_charge(port, false);
4542 		tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
4543 			       tcpm_data_role_for_sink(port));
4544 		/*
4545 		 * VBUS may or may not toggle, depending on the adapter.
4546 		 * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
4547 		 * directly after timeout.
4548 		 */
4549 		tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
4550 		break;
4551 	case SNK_HARD_RESET_WAIT_VBUS:
4552 		if (port->ams == HARD_RESET)
4553 			tcpm_ams_finish(port);
4554 		/* Assume we're disconnected if VBUS doesn't come back. */
4555 		tcpm_set_state(port, SNK_UNATTACHED,
4556 			       PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
4557 		break;
4558 	case SNK_HARD_RESET_SINK_ON:
4559 		/* Note: There is no guarantee that VBUS is on in this state */
4560 		/*
4561 		 * XXX:
4562 		 * The specification suggests that dual mode ports in sink
4563 		 * mode should transition to state PE_SRC_Transition_to_default.
4564 		 * See USB power delivery specification chapter 8.3.3.6.1.3.
4565 		 * This would mean to
4566 		 * - turn off VCONN, reset power supply
4567 		 * - request hardware reset
4568 		 * - turn on VCONN
4569 		 * - Transition to state PE_Src_Startup
4570 		 * SNK only ports shall transition to state Snk_Startup
4571 		 * (see chapter 8.3.3.3.8).
4572 		 * Similar, dual-mode ports in source mode should transition
4573 		 * to PE_SNK_Transition_to_default.
4574 		 */
4575 		if (port->pd_capable) {
4576 			tcpm_set_current_limit(port,
4577 					       tcpm_get_current_limit(port),
4578 					       5000);
4579 			/* Not sink vbus if operational current is 0mA */
4580 			tcpm_set_charge(port, !!pdo_max_current(port->snk_pdo[0]));
4581 		}
4582 		if (port->ams == HARD_RESET)
4583 			tcpm_ams_finish(port);
4584 		tcpm_set_attached_state(port, true);
4585 		tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
4586 		tcpm_set_state(port, SNK_STARTUP, 0);
4587 		break;
4588 
4589 	/* Soft_Reset states */
4590 	case SOFT_RESET:
4591 		port->message_id = 0;
4592 		port->rx_msgid = -1;
4593 		/* remove existing capabilities */
4594 		usb_power_delivery_unregister_capabilities(port->partner_source_caps);
4595 		port->partner_source_caps = NULL;
4596 		tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4597 		tcpm_ams_finish(port);
4598 		if (port->pwr_role == TYPEC_SOURCE) {
4599 			port->upcoming_state = SRC_SEND_CAPABILITIES;
4600 			tcpm_ams_start(port, POWER_NEGOTIATION);
4601 		} else {
4602 			tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4603 		}
4604 		break;
4605 	case SRC_SOFT_RESET_WAIT_SNK_TX:
4606 	case SNK_SOFT_RESET:
4607 		if (port->ams != NONE_AMS)
4608 			tcpm_ams_finish(port);
4609 		port->upcoming_state = SOFT_RESET_SEND;
4610 		tcpm_ams_start(port, SOFT_RESET_AMS);
4611 		break;
4612 	case SOFT_RESET_SEND:
4613 		port->message_id = 0;
4614 		port->rx_msgid = -1;
4615 		/* remove existing capabilities */
4616 		usb_power_delivery_unregister_capabilities(port->partner_source_caps);
4617 		port->partner_source_caps = NULL;
4618 		if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
4619 			tcpm_set_state_cond(port, hard_reset_state(port), 0);
4620 		else
4621 			tcpm_set_state_cond(port, hard_reset_state(port),
4622 					    PD_T_SENDER_RESPONSE);
4623 		break;
4624 
4625 	/* DR_Swap states */
4626 	case DR_SWAP_SEND:
4627 		tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
4628 		if (port->data_role == TYPEC_DEVICE || port->negotiated_rev > PD_REV20)
4629 			port->send_discover = true;
4630 		tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
4631 				    PD_T_SENDER_RESPONSE);
4632 		break;
4633 	case DR_SWAP_ACCEPT:
4634 		tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4635 		if (port->data_role == TYPEC_DEVICE || port->negotiated_rev > PD_REV20)
4636 			port->send_discover = true;
4637 		tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
4638 		break;
4639 	case DR_SWAP_SEND_TIMEOUT:
4640 		tcpm_swap_complete(port, -ETIMEDOUT);
4641 		port->send_discover = false;
4642 		tcpm_ams_finish(port);
4643 		tcpm_set_state(port, ready_state(port), 0);
4644 		break;
4645 	case DR_SWAP_CHANGE_DR:
4646 		tcpm_unregister_altmodes(port);
4647 		if (port->data_role == TYPEC_HOST)
4648 			tcpm_set_roles(port, true, port->pwr_role,
4649 				       TYPEC_DEVICE);
4650 		else
4651 			tcpm_set_roles(port, true, port->pwr_role,
4652 				       TYPEC_HOST);
4653 		tcpm_ams_finish(port);
4654 		tcpm_set_state(port, ready_state(port), 0);
4655 		break;
4656 
4657 	case FR_SWAP_SEND:
4658 		if (tcpm_pd_send_control(port, PD_CTRL_FR_SWAP)) {
4659 			tcpm_set_state(port, ERROR_RECOVERY, 0);
4660 			break;
4661 		}
4662 		tcpm_set_state_cond(port, FR_SWAP_SEND_TIMEOUT, PD_T_SENDER_RESPONSE);
4663 		break;
4664 	case FR_SWAP_SEND_TIMEOUT:
4665 		tcpm_set_state(port, ERROR_RECOVERY, 0);
4666 		break;
4667 	case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
4668 		tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_OFF);
4669 		break;
4670 	case FR_SWAP_SNK_SRC_NEW_SINK_READY:
4671 		if (port->vbus_source)
4672 			tcpm_set_state(port, FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED, 0);
4673 		else
4674 			tcpm_set_state(port, ERROR_RECOVERY, PD_T_RECEIVER_RESPONSE);
4675 		break;
4676 	case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
4677 		tcpm_set_pwr_role(port, TYPEC_SOURCE);
4678 		if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
4679 			tcpm_set_state(port, ERROR_RECOVERY, 0);
4680 			break;
4681 		}
4682 		tcpm_set_cc(port, tcpm_rp_cc(port));
4683 		tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
4684 		break;
4685 
4686 	/* PR_Swap states */
4687 	case PR_SWAP_ACCEPT:
4688 		tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4689 		tcpm_set_state(port, PR_SWAP_START, 0);
4690 		break;
4691 	case PR_SWAP_SEND:
4692 		tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
4693 		tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
4694 				    PD_T_SENDER_RESPONSE);
4695 		break;
4696 	case PR_SWAP_SEND_TIMEOUT:
4697 		tcpm_swap_complete(port, -ETIMEDOUT);
4698 		tcpm_set_state(port, ready_state(port), 0);
4699 		break;
4700 	case PR_SWAP_START:
4701 		tcpm_apply_rc(port);
4702 		if (port->pwr_role == TYPEC_SOURCE)
4703 			tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
4704 				       PD_T_SRC_TRANSITION);
4705 		else
4706 			tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
4707 		break;
4708 	case PR_SWAP_SRC_SNK_TRANSITION_OFF:
4709 		/*
4710 		 * Prevent vbus discharge circuit from turning on during PR_SWAP
4711 		 * as this is not a disconnect.
4712 		 */
4713 		tcpm_set_vbus(port, false);
4714 		port->explicit_contract = false;
4715 		/* allow time for Vbus discharge, must be < tSrcSwapStdby */
4716 		tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
4717 			       PD_T_SRCSWAPSTDBY);
4718 		break;
4719 	case PR_SWAP_SRC_SNK_SOURCE_OFF:
4720 		tcpm_set_cc(port, TYPEC_CC_RD);
4721 		/* allow CC debounce */
4722 		tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
4723 			       PD_T_CC_DEBOUNCE);
4724 		break;
4725 	case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
4726 		/*
4727 		 * USB-PD standard, 6.2.1.4, Port Power Role:
4728 		 * "During the Power Role Swap Sequence, for the initial Source
4729 		 * Port, the Port Power Role field shall be set to Sink in the
4730 		 * PS_RDY Message indicating that the initial Source’s power
4731 		 * supply is turned off"
4732 		 */
4733 		tcpm_set_pwr_role(port, TYPEC_SINK);
4734 		if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
4735 			tcpm_set_state(port, ERROR_RECOVERY, 0);
4736 			break;
4737 		}
4738 		tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_ON_PRS);
4739 		break;
4740 	case PR_SWAP_SRC_SNK_SINK_ON:
4741 		tcpm_enable_auto_vbus_discharge(port, true);
4742 		/* Set the vbus disconnect threshold for implicit contract */
4743 		tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
4744 		tcpm_set_state(port, SNK_STARTUP, 0);
4745 		break;
4746 	case PR_SWAP_SNK_SRC_SINK_OFF:
4747 		/* will be source, remove existing capabilities */
4748 		usb_power_delivery_unregister_capabilities(port->partner_source_caps);
4749 		port->partner_source_caps = NULL;
4750 		/*
4751 		 * Prevent vbus discharge circuit from turning on during PR_SWAP
4752 		 * as this is not a disconnect.
4753 		 */
4754 		tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB,
4755 						       port->pps_data.active, 0);
4756 		tcpm_set_charge(port, false);
4757 		tcpm_set_state(port, hard_reset_state(port),
4758 			       PD_T_PS_SOURCE_OFF);
4759 		break;
4760 	case PR_SWAP_SNK_SRC_SOURCE_ON:
4761 		tcpm_enable_auto_vbus_discharge(port, true);
4762 		tcpm_set_cc(port, tcpm_rp_cc(port));
4763 		tcpm_set_vbus(port, true);
4764 		/*
4765 		 * allow time VBUS ramp-up, must be < tNewSrc
4766 		 * Also, this window overlaps with CC debounce as well.
4767 		 * So, Wait for the max of two which is PD_T_NEWSRC
4768 		 */
4769 		tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
4770 			       PD_T_NEWSRC);
4771 		break;
4772 	case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
4773 		/*
4774 		 * USB PD standard, 6.2.1.4:
4775 		 * "Subsequent Messages initiated by the Policy Engine,
4776 		 * such as the PS_RDY Message sent to indicate that Vbus
4777 		 * is ready, will have the Port Power Role field set to
4778 		 * Source."
4779 		 */
4780 		tcpm_set_pwr_role(port, TYPEC_SOURCE);
4781 		tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4782 		tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
4783 		break;
4784 
4785 	case VCONN_SWAP_ACCEPT:
4786 		tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4787 		tcpm_ams_finish(port);
4788 		tcpm_set_state(port, VCONN_SWAP_START, 0);
4789 		break;
4790 	case VCONN_SWAP_SEND:
4791 		tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
4792 		tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
4793 			       PD_T_SENDER_RESPONSE);
4794 		break;
4795 	case VCONN_SWAP_SEND_TIMEOUT:
4796 		tcpm_swap_complete(port, -ETIMEDOUT);
4797 		tcpm_set_state(port, ready_state(port), 0);
4798 		break;
4799 	case VCONN_SWAP_START:
4800 		if (port->vconn_role == TYPEC_SOURCE)
4801 			tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
4802 		else
4803 			tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
4804 		break;
4805 	case VCONN_SWAP_WAIT_FOR_VCONN:
4806 		tcpm_set_state(port, hard_reset_state(port),
4807 			       PD_T_VCONN_SOURCE_ON);
4808 		break;
4809 	case VCONN_SWAP_TURN_ON_VCONN:
4810 		tcpm_set_vconn(port, true);
4811 		tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4812 		tcpm_set_state(port, ready_state(port), 0);
4813 		break;
4814 	case VCONN_SWAP_TURN_OFF_VCONN:
4815 		tcpm_set_vconn(port, false);
4816 		tcpm_set_state(port, ready_state(port), 0);
4817 		break;
4818 
4819 	case DR_SWAP_CANCEL:
4820 	case PR_SWAP_CANCEL:
4821 	case VCONN_SWAP_CANCEL:
4822 		tcpm_swap_complete(port, port->swap_status);
4823 		if (port->pwr_role == TYPEC_SOURCE)
4824 			tcpm_set_state(port, SRC_READY, 0);
4825 		else
4826 			tcpm_set_state(port, SNK_READY, 0);
4827 		break;
4828 	case FR_SWAP_CANCEL:
4829 		if (port->pwr_role == TYPEC_SOURCE)
4830 			tcpm_set_state(port, SRC_READY, 0);
4831 		else
4832 			tcpm_set_state(port, SNK_READY, 0);
4833 		break;
4834 
4835 	case BIST_RX:
4836 		switch (BDO_MODE_MASK(port->bist_request)) {
4837 		case BDO_MODE_CARRIER2:
4838 			tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
4839 			tcpm_set_state(port, unattached_state(port),
4840 				       PD_T_BIST_CONT_MODE);
4841 			break;
4842 		case BDO_MODE_TESTDATA:
4843 			if (port->tcpc->set_bist_data) {
4844 				tcpm_log(port, "Enable BIST MODE TESTDATA");
4845 				port->tcpc->set_bist_data(port->tcpc, true);
4846 			}
4847 			break;
4848 		default:
4849 			break;
4850 		}
4851 		break;
4852 	case GET_STATUS_SEND:
4853 		tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
4854 		tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
4855 			       PD_T_SENDER_RESPONSE);
4856 		break;
4857 	case GET_STATUS_SEND_TIMEOUT:
4858 		tcpm_set_state(port, ready_state(port), 0);
4859 		break;
4860 	case GET_PPS_STATUS_SEND:
4861 		tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
4862 		tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
4863 			       PD_T_SENDER_RESPONSE);
4864 		break;
4865 	case GET_PPS_STATUS_SEND_TIMEOUT:
4866 		tcpm_set_state(port, ready_state(port), 0);
4867 		break;
4868 	case GET_SINK_CAP:
4869 		tcpm_pd_send_control(port, PD_CTRL_GET_SINK_CAP);
4870 		tcpm_set_state(port, GET_SINK_CAP_TIMEOUT, PD_T_SENDER_RESPONSE);
4871 		break;
4872 	case GET_SINK_CAP_TIMEOUT:
4873 		port->sink_cap_done = true;
4874 		tcpm_set_state(port, ready_state(port), 0);
4875 		break;
4876 	case ERROR_RECOVERY:
4877 		tcpm_swap_complete(port, -EPROTO);
4878 		tcpm_pps_complete(port, -EPROTO);
4879 		tcpm_set_state(port, PORT_RESET, 0);
4880 		break;
4881 	case PORT_RESET:
4882 		tcpm_reset_port(port);
4883 		if (port->self_powered)
4884 			tcpm_set_cc(port, TYPEC_CC_OPEN);
4885 		else
4886 			tcpm_set_cc(port, tcpm_default_state(port) == SNK_UNATTACHED ?
4887 				    TYPEC_CC_RD : tcpm_rp_cc(port));
4888 		tcpm_set_state(port, PORT_RESET_WAIT_OFF,
4889 			       PD_T_ERROR_RECOVERY);
4890 		break;
4891 	case PORT_RESET_WAIT_OFF:
4892 		tcpm_set_state(port,
4893 			       tcpm_default_state(port),
4894 			       port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
4895 		break;
4896 
4897 	/* AMS intermediate state */
4898 	case AMS_START:
4899 		if (port->upcoming_state == INVALID_STATE) {
4900 			tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
4901 				       SRC_READY : SNK_READY, 0);
4902 			break;
4903 		}
4904 
4905 		upcoming_state = port->upcoming_state;
4906 		port->upcoming_state = INVALID_STATE;
4907 		tcpm_set_state(port, upcoming_state, 0);
4908 		break;
4909 
4910 	/* Chunk state */
4911 	case CHUNK_NOT_SUPP:
4912 		tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
4913 		tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ? SRC_READY : SNK_READY, 0);
4914 		break;
4915 	default:
4916 		WARN(1, "Unexpected port state %d\n", port->state);
4917 		break;
4918 	}
4919 }
4920 
tcpm_state_machine_work(struct kthread_work * work)4921 static void tcpm_state_machine_work(struct kthread_work *work)
4922 {
4923 	struct tcpm_port *port = container_of(work, struct tcpm_port, state_machine);
4924 	enum tcpm_state prev_state;
4925 
4926 	mutex_lock(&port->lock);
4927 	port->state_machine_running = true;
4928 
4929 	if (port->queued_message && tcpm_send_queued_message(port))
4930 		goto done;
4931 
4932 	/* If we were queued due to a delayed state change, update it now */
4933 	if (port->delayed_state) {
4934 		tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
4935 			 tcpm_states[port->state],
4936 			 tcpm_states[port->delayed_state], port->delay_ms);
4937 		port->prev_state = port->state;
4938 		port->state = port->delayed_state;
4939 		port->delayed_state = INVALID_STATE;
4940 	}
4941 
4942 	/*
4943 	 * Continue running as long as we have (non-delayed) state changes
4944 	 * to make.
4945 	 */
4946 	do {
4947 		prev_state = port->state;
4948 		run_state_machine(port);
4949 		if (port->queued_message)
4950 			tcpm_send_queued_message(port);
4951 	} while (port->state != prev_state && !port->delayed_state);
4952 
4953 done:
4954 	port->state_machine_running = false;
4955 	mutex_unlock(&port->lock);
4956 }
4957 
_tcpm_cc_change(struct tcpm_port * port,enum typec_cc_status cc1,enum typec_cc_status cc2)4958 static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
4959 			    enum typec_cc_status cc2)
4960 {
4961 	enum typec_cc_status old_cc1, old_cc2;
4962 	enum tcpm_state new_state;
4963 
4964 	old_cc1 = port->cc1;
4965 	old_cc2 = port->cc2;
4966 	port->cc1 = cc1;
4967 	port->cc2 = cc2;
4968 
4969 	tcpm_log_force(port,
4970 		       "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
4971 		       old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
4972 		       port->polarity,
4973 		       tcpm_port_is_disconnected(port) ? "disconnected"
4974 						       : "connected");
4975 
4976 	switch (port->state) {
4977 	case TOGGLING:
4978 		if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
4979 		    tcpm_port_is_source(port))
4980 			tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4981 		else if (tcpm_port_is_sink(port))
4982 			tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
4983 		break;
4984 	case CHECK_CONTAMINANT:
4985 		/* Wait for Toggling to be resumed */
4986 		break;
4987 	case SRC_UNATTACHED:
4988 	case ACC_UNATTACHED:
4989 		if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
4990 		    tcpm_port_is_source(port))
4991 			tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4992 		break;
4993 	case SRC_ATTACH_WAIT:
4994 		if (tcpm_port_is_disconnected(port) ||
4995 		    tcpm_port_is_audio_detached(port))
4996 			tcpm_set_state(port, SRC_UNATTACHED, 0);
4997 		else if (cc1 != old_cc1 || cc2 != old_cc2)
4998 			tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4999 		break;
5000 	case SRC_ATTACHED:
5001 	case SRC_STARTUP:
5002 	case SRC_SEND_CAPABILITIES:
5003 	case SRC_READY:
5004 		if (tcpm_port_is_disconnected(port) ||
5005 		    !tcpm_port_is_source(port)) {
5006 			if (port->port_type == TYPEC_PORT_SRC)
5007 				tcpm_set_state(port, SRC_UNATTACHED, tcpm_wait_for_discharge(port));
5008 			else
5009 				tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
5010 		}
5011 		break;
5012 	case SNK_UNATTACHED:
5013 		if (tcpm_port_is_sink(port))
5014 			tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
5015 		break;
5016 	case SNK_ATTACH_WAIT:
5017 		if ((port->cc1 == TYPEC_CC_OPEN &&
5018 		     port->cc2 != TYPEC_CC_OPEN) ||
5019 		    (port->cc1 != TYPEC_CC_OPEN &&
5020 		     port->cc2 == TYPEC_CC_OPEN))
5021 			new_state = SNK_DEBOUNCED;
5022 		else if (tcpm_port_is_disconnected(port))
5023 			new_state = SNK_UNATTACHED;
5024 		else
5025 			break;
5026 		if (new_state != port->delayed_state)
5027 			tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
5028 		break;
5029 	case SNK_DEBOUNCED:
5030 		if (tcpm_port_is_disconnected(port))
5031 			new_state = SNK_UNATTACHED;
5032 		else if (port->vbus_present)
5033 			new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
5034 		else
5035 			new_state = SNK_UNATTACHED;
5036 		if (new_state != port->delayed_state)
5037 			tcpm_set_state(port, SNK_DEBOUNCED, 0);
5038 		break;
5039 	case SNK_READY:
5040 		/*
5041 		 * EXIT condition is based primarily on vbus disconnect and CC is secondary.
5042 		 * "A port that has entered into USB PD communications with the Source and
5043 		 * has seen the CC voltage exceed vRd-USB may monitor the CC pin to detect
5044 		 * cable disconnect in addition to monitoring VBUS.
5045 		 *
5046 		 * A port that is monitoring the CC voltage for disconnect (but is not in
5047 		 * the process of a USB PD PR_Swap or USB PD FR_Swap) shall transition to
5048 		 * Unattached.SNK within tSinkDisconnect after the CC voltage remains below
5049 		 * vRd-USB for tPDDebounce."
5050 		 *
5051 		 * When set_auto_vbus_discharge_threshold is enabled, CC pins go
5052 		 * away before vbus decays to disconnect threshold. Allow
5053 		 * disconnect to be driven by vbus disconnect when auto vbus
5054 		 * discharge is enabled.
5055 		 */
5056 		if (!port->auto_vbus_discharge_enabled && tcpm_port_is_disconnected(port))
5057 			tcpm_set_state(port, unattached_state(port), 0);
5058 		else if (!port->pd_capable &&
5059 			 (cc1 != old_cc1 || cc2 != old_cc2))
5060 			tcpm_set_current_limit(port,
5061 					       tcpm_get_current_limit(port),
5062 					       5000);
5063 		break;
5064 
5065 	case AUDIO_ACC_ATTACHED:
5066 		if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
5067 			tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
5068 		break;
5069 	case AUDIO_ACC_DEBOUNCE:
5070 		if (tcpm_port_is_audio(port))
5071 			tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
5072 		break;
5073 
5074 	case DEBUG_ACC_ATTACHED:
5075 		if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
5076 			tcpm_set_state(port, ACC_UNATTACHED, 0);
5077 		break;
5078 
5079 	case SNK_TRY:
5080 		/* Do nothing, waiting for timeout */
5081 		break;
5082 
5083 	case SNK_DISCOVERY:
5084 		/* CC line is unstable, wait for debounce */
5085 		if (tcpm_port_is_disconnected(port))
5086 			tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
5087 		break;
5088 	case SNK_DISCOVERY_DEBOUNCE:
5089 		break;
5090 
5091 	case SRC_TRYWAIT:
5092 		/* Hand over to state machine if needed */
5093 		if (!port->vbus_present && tcpm_port_is_source(port))
5094 			tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
5095 		break;
5096 	case SRC_TRYWAIT_DEBOUNCE:
5097 		if (port->vbus_present || !tcpm_port_is_source(port))
5098 			tcpm_set_state(port, SRC_TRYWAIT, 0);
5099 		break;
5100 	case SNK_TRY_WAIT_DEBOUNCE:
5101 		if (!tcpm_port_is_sink(port)) {
5102 			port->max_wait = 0;
5103 			tcpm_set_state(port, SRC_TRYWAIT, 0);
5104 		}
5105 		break;
5106 	case SRC_TRY_WAIT:
5107 		if (tcpm_port_is_source(port))
5108 			tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
5109 		break;
5110 	case SRC_TRY_DEBOUNCE:
5111 		tcpm_set_state(port, SRC_TRY_WAIT, 0);
5112 		break;
5113 	case SNK_TRYWAIT_DEBOUNCE:
5114 		if (tcpm_port_is_sink(port))
5115 			tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
5116 		break;
5117 	case SNK_TRYWAIT_VBUS:
5118 		if (!tcpm_port_is_sink(port))
5119 			tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
5120 		break;
5121 	case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
5122 		if (!tcpm_port_is_sink(port))
5123 			tcpm_set_state(port, SRC_TRYWAIT, PD_T_TRY_CC_DEBOUNCE);
5124 		else
5125 			tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS, 0);
5126 		break;
5127 	case SNK_TRYWAIT:
5128 		/* Do nothing, waiting for tCCDebounce */
5129 		break;
5130 	case PR_SWAP_SNK_SRC_SINK_OFF:
5131 	case PR_SWAP_SRC_SNK_TRANSITION_OFF:
5132 	case PR_SWAP_SRC_SNK_SOURCE_OFF:
5133 	case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
5134 	case PR_SWAP_SNK_SRC_SOURCE_ON:
5135 		/*
5136 		 * CC state change is expected in PR_SWAP
5137 		 * Ignore it.
5138 		 */
5139 		break;
5140 	case FR_SWAP_SEND:
5141 	case FR_SWAP_SEND_TIMEOUT:
5142 	case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5143 	case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5144 	case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5145 		/* Do nothing, CC change expected */
5146 		break;
5147 
5148 	case PORT_RESET:
5149 	case PORT_RESET_WAIT_OFF:
5150 		/*
5151 		 * State set back to default mode once the timer completes.
5152 		 * Ignore CC changes here.
5153 		 */
5154 		break;
5155 	default:
5156 		/*
5157 		 * While acting as sink and auto vbus discharge is enabled, Allow disconnect
5158 		 * to be driven by vbus disconnect.
5159 		 */
5160 		if (tcpm_port_is_disconnected(port) && !(port->pwr_role == TYPEC_SINK &&
5161 							 port->auto_vbus_discharge_enabled))
5162 			tcpm_set_state(port, unattached_state(port), 0);
5163 		break;
5164 	}
5165 }
5166 
_tcpm_pd_vbus_on(struct tcpm_port * port)5167 static void _tcpm_pd_vbus_on(struct tcpm_port *port)
5168 {
5169 	tcpm_log_force(port, "VBUS on");
5170 	port->vbus_present = true;
5171 	/*
5172 	 * When vbus_present is true i.e. Voltage at VBUS is greater than VSAFE5V implicitly
5173 	 * states that vbus is not at VSAFE0V, hence clear the vbus_vsafe0v flag here.
5174 	 */
5175 	port->vbus_vsafe0v = false;
5176 
5177 	switch (port->state) {
5178 	case SNK_TRANSITION_SINK_VBUS:
5179 		port->explicit_contract = true;
5180 		tcpm_set_state(port, SNK_READY, 0);
5181 		break;
5182 	case SNK_DISCOVERY:
5183 		tcpm_set_state(port, SNK_DISCOVERY, 0);
5184 		break;
5185 
5186 	case SNK_DEBOUNCED:
5187 		tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
5188 							: SNK_ATTACHED,
5189 				       0);
5190 		break;
5191 	case SNK_HARD_RESET_WAIT_VBUS:
5192 		tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
5193 		break;
5194 	case SRC_ATTACHED:
5195 		tcpm_set_state(port, SRC_STARTUP, 0);
5196 		break;
5197 	case SRC_HARD_RESET_VBUS_ON:
5198 		tcpm_set_state(port, SRC_STARTUP, 0);
5199 		break;
5200 
5201 	case SNK_TRY:
5202 		/* Do nothing, waiting for timeout */
5203 		break;
5204 	case SRC_TRYWAIT:
5205 		/* Do nothing, Waiting for Rd to be detected */
5206 		break;
5207 	case SRC_TRYWAIT_DEBOUNCE:
5208 		tcpm_set_state(port, SRC_TRYWAIT, 0);
5209 		break;
5210 	case SNK_TRY_WAIT_DEBOUNCE:
5211 		/* Do nothing, waiting for PD_DEBOUNCE to do be done */
5212 		break;
5213 	case SNK_TRYWAIT:
5214 		/* Do nothing, waiting for tCCDebounce */
5215 		break;
5216 	case SNK_TRYWAIT_VBUS:
5217 		if (tcpm_port_is_sink(port))
5218 			tcpm_set_state(port, SNK_ATTACHED, 0);
5219 		break;
5220 	case SNK_TRYWAIT_DEBOUNCE:
5221 		/* Do nothing, waiting for Rp */
5222 		break;
5223 	case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
5224 		if (port->vbus_present && tcpm_port_is_sink(port))
5225 			tcpm_set_state(port, SNK_ATTACHED, 0);
5226 		break;
5227 	case SRC_TRY_WAIT:
5228 	case SRC_TRY_DEBOUNCE:
5229 		/* Do nothing, waiting for sink detection */
5230 		break;
5231 	case FR_SWAP_SEND:
5232 	case FR_SWAP_SEND_TIMEOUT:
5233 	case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5234 	case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5235 		if (port->tcpc->frs_sourcing_vbus)
5236 			port->tcpc->frs_sourcing_vbus(port->tcpc);
5237 		break;
5238 	case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5239 		if (port->tcpc->frs_sourcing_vbus)
5240 			port->tcpc->frs_sourcing_vbus(port->tcpc);
5241 		tcpm_set_state(port, FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED, 0);
5242 		break;
5243 
5244 	case PORT_RESET:
5245 	case PORT_RESET_WAIT_OFF:
5246 		/*
5247 		 * State set back to default mode once the timer completes.
5248 		 * Ignore vbus changes here.
5249 		 */
5250 		break;
5251 
5252 	default:
5253 		break;
5254 	}
5255 }
5256 
_tcpm_pd_vbus_off(struct tcpm_port * port)5257 static void _tcpm_pd_vbus_off(struct tcpm_port *port)
5258 {
5259 	tcpm_log_force(port, "VBUS off");
5260 	port->vbus_present = false;
5261 	port->vbus_never_low = false;
5262 	switch (port->state) {
5263 	case SNK_HARD_RESET_SINK_OFF:
5264 		tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
5265 		break;
5266 	case HARD_RESET_SEND:
5267 		break;
5268 	case SNK_TRY:
5269 		/* Do nothing, waiting for timeout */
5270 		break;
5271 	case SRC_TRYWAIT:
5272 		/* Hand over to state machine if needed */
5273 		if (tcpm_port_is_source(port))
5274 			tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
5275 		break;
5276 	case SNK_TRY_WAIT_DEBOUNCE:
5277 		/* Do nothing, waiting for PD_DEBOUNCE to do be done */
5278 		break;
5279 	case SNK_TRYWAIT:
5280 	case SNK_TRYWAIT_VBUS:
5281 	case SNK_TRYWAIT_DEBOUNCE:
5282 		break;
5283 	case SNK_ATTACH_WAIT:
5284 	case SNK_DEBOUNCED:
5285 		/* Do nothing, as TCPM is still waiting for vbus to reaach VSAFE5V to connect */
5286 		break;
5287 
5288 	case SNK_NEGOTIATE_CAPABILITIES:
5289 		break;
5290 
5291 	case PR_SWAP_SRC_SNK_TRANSITION_OFF:
5292 		tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
5293 		break;
5294 
5295 	case PR_SWAP_SNK_SRC_SINK_OFF:
5296 		/* Do nothing, expected */
5297 		break;
5298 
5299 	case PR_SWAP_SNK_SRC_SOURCE_ON:
5300 		/*
5301 		 * Do nothing when vbus off notification is received.
5302 		 * TCPM can wait for PD_T_NEWSRC in PR_SWAP_SNK_SRC_SOURCE_ON
5303 		 * for the vbus source to ramp up.
5304 		 */
5305 		break;
5306 
5307 	case PORT_RESET_WAIT_OFF:
5308 		tcpm_set_state(port, tcpm_default_state(port), 0);
5309 		break;
5310 
5311 	case SRC_TRY_WAIT:
5312 	case SRC_TRY_DEBOUNCE:
5313 		/* Do nothing, waiting for sink detection */
5314 		break;
5315 
5316 	case SRC_STARTUP:
5317 	case SRC_SEND_CAPABILITIES:
5318 	case SRC_SEND_CAPABILITIES_TIMEOUT:
5319 	case SRC_NEGOTIATE_CAPABILITIES:
5320 	case SRC_TRANSITION_SUPPLY:
5321 	case SRC_READY:
5322 	case SRC_WAIT_NEW_CAPABILITIES:
5323 		/*
5324 		 * Force to unattached state to re-initiate connection.
5325 		 * DRP port should move to Unattached.SNK instead of Unattached.SRC if
5326 		 * sink removed. Although sink removal here is due to source's vbus collapse,
5327 		 * treat it the same way for consistency.
5328 		 */
5329 		if (port->port_type == TYPEC_PORT_SRC)
5330 			tcpm_set_state(port, SRC_UNATTACHED, tcpm_wait_for_discharge(port));
5331 		else
5332 			tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
5333 		break;
5334 
5335 	case PORT_RESET:
5336 		/*
5337 		 * State set back to default mode once the timer completes.
5338 		 * Ignore vbus changes here.
5339 		 */
5340 		break;
5341 
5342 	case FR_SWAP_SEND:
5343 	case FR_SWAP_SEND_TIMEOUT:
5344 	case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5345 	case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5346 	case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5347 		/* Do nothing, vbus drop expected */
5348 		break;
5349 
5350 	case SNK_HARD_RESET_WAIT_VBUS:
5351 		/* Do nothing, its OK to receive vbus off events */
5352 		break;
5353 
5354 	default:
5355 		if (port->pwr_role == TYPEC_SINK && port->attached)
5356 			tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
5357 		break;
5358 	}
5359 }
5360 
_tcpm_pd_vbus_vsafe0v(struct tcpm_port * port)5361 static void _tcpm_pd_vbus_vsafe0v(struct tcpm_port *port)
5362 {
5363 	tcpm_log_force(port, "VBUS VSAFE0V");
5364 	port->vbus_vsafe0v = true;
5365 	switch (port->state) {
5366 	case SRC_HARD_RESET_VBUS_OFF:
5367 		/*
5368 		 * After establishing the vSafe0V voltage condition on VBUS, the Source Shall wait
5369 		 * tSrcRecover before re-applying VCONN and restoring VBUS to vSafe5V.
5370 		 */
5371 		tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
5372 		break;
5373 	case SRC_ATTACH_WAIT:
5374 		if (tcpm_port_is_source(port))
5375 			tcpm_set_state(port, tcpm_try_snk(port) ? SNK_TRY : SRC_ATTACHED,
5376 				       PD_T_CC_DEBOUNCE);
5377 		break;
5378 	case SRC_STARTUP:
5379 	case SRC_SEND_CAPABILITIES:
5380 	case SRC_SEND_CAPABILITIES_TIMEOUT:
5381 	case SRC_NEGOTIATE_CAPABILITIES:
5382 	case SRC_TRANSITION_SUPPLY:
5383 	case SRC_READY:
5384 	case SRC_WAIT_NEW_CAPABILITIES:
5385 		if (port->auto_vbus_discharge_enabled) {
5386 			if (port->port_type == TYPEC_PORT_SRC)
5387 				tcpm_set_state(port, SRC_UNATTACHED, 0);
5388 			else
5389 				tcpm_set_state(port, SNK_UNATTACHED, 0);
5390 		}
5391 		break;
5392 	case PR_SWAP_SNK_SRC_SINK_OFF:
5393 	case PR_SWAP_SNK_SRC_SOURCE_ON:
5394 		/* Do nothing, vsafe0v is expected during transition */
5395 		break;
5396 	case SNK_ATTACH_WAIT:
5397 	case SNK_DEBOUNCED:
5398 		/*Do nothing, still waiting for VSAFE5V for connect */
5399 		break;
5400 	case SNK_HARD_RESET_WAIT_VBUS:
5401 		/* Do nothing, its OK to receive vbus off events */
5402 		break;
5403 	default:
5404 		if (port->pwr_role == TYPEC_SINK && port->auto_vbus_discharge_enabled)
5405 			tcpm_set_state(port, SNK_UNATTACHED, 0);
5406 		break;
5407 	}
5408 }
5409 
_tcpm_pd_hard_reset(struct tcpm_port * port)5410 static void _tcpm_pd_hard_reset(struct tcpm_port *port)
5411 {
5412 	tcpm_log_force(port, "Received hard reset");
5413 	if (port->bist_request == BDO_MODE_TESTDATA && port->tcpc->set_bist_data)
5414 		port->tcpc->set_bist_data(port->tcpc, false);
5415 
5416 	switch (port->state) {
5417 	case TOGGLING:
5418 	case ERROR_RECOVERY:
5419 	case PORT_RESET:
5420 	case PORT_RESET_WAIT_OFF:
5421 		return;
5422 	default:
5423 		break;
5424 	}
5425 
5426 	if (port->ams != NONE_AMS)
5427 		port->ams = NONE_AMS;
5428 	if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
5429 		port->ams = HARD_RESET;
5430 	/*
5431 	 * If we keep receiving hard reset requests, executing the hard reset
5432 	 * must have failed. Revert to error recovery if that happens.
5433 	 */
5434 	tcpm_set_state(port,
5435 		       port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
5436 				HARD_RESET_START : ERROR_RECOVERY,
5437 		       0);
5438 }
5439 
tcpm_pd_event_handler(struct kthread_work * work)5440 static void tcpm_pd_event_handler(struct kthread_work *work)
5441 {
5442 	struct tcpm_port *port = container_of(work, struct tcpm_port,
5443 					      event_work);
5444 	u32 events;
5445 
5446 	mutex_lock(&port->lock);
5447 
5448 	spin_lock(&port->pd_event_lock);
5449 	while (port->pd_events) {
5450 		events = port->pd_events;
5451 		port->pd_events = 0;
5452 		spin_unlock(&port->pd_event_lock);
5453 		if (events & TCPM_RESET_EVENT)
5454 			_tcpm_pd_hard_reset(port);
5455 		if (events & TCPM_VBUS_EVENT) {
5456 			bool vbus;
5457 
5458 			vbus = port->tcpc->get_vbus(port->tcpc);
5459 			if (vbus) {
5460 				_tcpm_pd_vbus_on(port);
5461 			} else {
5462 				_tcpm_pd_vbus_off(port);
5463 				/*
5464 				 * When TCPC does not support detecting vsafe0v voltage level,
5465 				 * treat vbus absent as vsafe0v. Else invoke is_vbus_vsafe0v
5466 				 * to see if vbus has discharge to VSAFE0V.
5467 				 */
5468 				if (!port->tcpc->is_vbus_vsafe0v ||
5469 				    port->tcpc->is_vbus_vsafe0v(port->tcpc))
5470 					_tcpm_pd_vbus_vsafe0v(port);
5471 			}
5472 		}
5473 		if (events & TCPM_CC_EVENT) {
5474 			enum typec_cc_status cc1, cc2;
5475 
5476 			if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
5477 				_tcpm_cc_change(port, cc1, cc2);
5478 		}
5479 		if (events & TCPM_FRS_EVENT) {
5480 			if (port->state == SNK_READY) {
5481 				int ret;
5482 
5483 				port->upcoming_state = FR_SWAP_SEND;
5484 				ret = tcpm_ams_start(port, FAST_ROLE_SWAP);
5485 				if (ret == -EAGAIN)
5486 					port->upcoming_state = INVALID_STATE;
5487 			} else {
5488 				tcpm_log(port, "Discarding FRS_SIGNAL! Not in sink ready");
5489 			}
5490 		}
5491 		if (events & TCPM_SOURCING_VBUS) {
5492 			tcpm_log(port, "sourcing vbus");
5493 			/*
5494 			 * In fast role swap case TCPC autonomously sources vbus. Set vbus_source
5495 			 * true as TCPM wouldn't have called tcpm_set_vbus.
5496 			 *
5497 			 * When vbus is sourced on the command on TCPM i.e. TCPM called
5498 			 * tcpm_set_vbus to source vbus, vbus_source would already be true.
5499 			 */
5500 			port->vbus_source = true;
5501 			_tcpm_pd_vbus_on(port);
5502 		}
5503 		if (events & TCPM_PORT_CLEAN) {
5504 			tcpm_log(port, "port clean");
5505 			if (port->state == CHECK_CONTAMINANT) {
5506 				if (tcpm_start_toggling(port, tcpm_rp_cc(port)))
5507 					tcpm_set_state(port, TOGGLING, 0);
5508 				else
5509 					tcpm_set_state(port, tcpm_default_state(port), 0);
5510 			}
5511 		}
5512 
5513 		spin_lock(&port->pd_event_lock);
5514 	}
5515 	spin_unlock(&port->pd_event_lock);
5516 	mutex_unlock(&port->lock);
5517 }
5518 
tcpm_cc_change(struct tcpm_port * port)5519 void tcpm_cc_change(struct tcpm_port *port)
5520 {
5521 	spin_lock(&port->pd_event_lock);
5522 	port->pd_events |= TCPM_CC_EVENT;
5523 	spin_unlock(&port->pd_event_lock);
5524 	kthread_queue_work(port->wq, &port->event_work);
5525 }
5526 EXPORT_SYMBOL_GPL(tcpm_cc_change);
5527 
tcpm_vbus_change(struct tcpm_port * port)5528 void tcpm_vbus_change(struct tcpm_port *port)
5529 {
5530 	spin_lock(&port->pd_event_lock);
5531 	port->pd_events |= TCPM_VBUS_EVENT;
5532 	spin_unlock(&port->pd_event_lock);
5533 	kthread_queue_work(port->wq, &port->event_work);
5534 }
5535 EXPORT_SYMBOL_GPL(tcpm_vbus_change);
5536 
tcpm_pd_hard_reset(struct tcpm_port * port)5537 void tcpm_pd_hard_reset(struct tcpm_port *port)
5538 {
5539 	spin_lock(&port->pd_event_lock);
5540 	port->pd_events = TCPM_RESET_EVENT;
5541 	spin_unlock(&port->pd_event_lock);
5542 	kthread_queue_work(port->wq, &port->event_work);
5543 }
5544 EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
5545 
tcpm_sink_frs(struct tcpm_port * port)5546 void tcpm_sink_frs(struct tcpm_port *port)
5547 {
5548 	spin_lock(&port->pd_event_lock);
5549 	port->pd_events |= TCPM_FRS_EVENT;
5550 	spin_unlock(&port->pd_event_lock);
5551 	kthread_queue_work(port->wq, &port->event_work);
5552 }
5553 EXPORT_SYMBOL_GPL(tcpm_sink_frs);
5554 
tcpm_sourcing_vbus(struct tcpm_port * port)5555 void tcpm_sourcing_vbus(struct tcpm_port *port)
5556 {
5557 	spin_lock(&port->pd_event_lock);
5558 	port->pd_events |= TCPM_SOURCING_VBUS;
5559 	spin_unlock(&port->pd_event_lock);
5560 	kthread_queue_work(port->wq, &port->event_work);
5561 }
5562 EXPORT_SYMBOL_GPL(tcpm_sourcing_vbus);
5563 
tcpm_port_clean(struct tcpm_port * port)5564 void tcpm_port_clean(struct tcpm_port *port)
5565 {
5566 	spin_lock(&port->pd_event_lock);
5567 	port->pd_events |= TCPM_PORT_CLEAN;
5568 	spin_unlock(&port->pd_event_lock);
5569 	kthread_queue_work(port->wq, &port->event_work);
5570 }
5571 EXPORT_SYMBOL_GPL(tcpm_port_clean);
5572 
tcpm_port_is_toggling(struct tcpm_port * port)5573 bool tcpm_port_is_toggling(struct tcpm_port *port)
5574 {
5575 	return port->port_type == TYPEC_PORT_DRP && port->state == TOGGLING;
5576 }
5577 EXPORT_SYMBOL_GPL(tcpm_port_is_toggling);
5578 
tcpm_enable_frs_work(struct kthread_work * work)5579 static void tcpm_enable_frs_work(struct kthread_work *work)
5580 {
5581 	struct tcpm_port *port = container_of(work, struct tcpm_port, enable_frs);
5582 	int ret;
5583 
5584 	mutex_lock(&port->lock);
5585 	/* Not FRS capable */
5586 	if (!port->connected || port->port_type != TYPEC_PORT_DRP ||
5587 	    port->pwr_opmode != TYPEC_PWR_MODE_PD ||
5588 	    !port->tcpc->enable_frs ||
5589 	    /* Sink caps queried */
5590 	    port->sink_cap_done || port->negotiated_rev < PD_REV30)
5591 		goto unlock;
5592 
5593 	/* Send when the state machine is idle */
5594 	if (port->state != SNK_READY || port->vdm_sm_running || port->send_discover)
5595 		goto resched;
5596 
5597 	port->upcoming_state = GET_SINK_CAP;
5598 	ret = tcpm_ams_start(port, GET_SINK_CAPABILITIES);
5599 	if (ret == -EAGAIN) {
5600 		port->upcoming_state = INVALID_STATE;
5601 	} else {
5602 		port->sink_cap_done = true;
5603 		goto unlock;
5604 	}
5605 resched:
5606 	mod_enable_frs_delayed_work(port, GET_SINK_CAP_RETRY_MS);
5607 unlock:
5608 	mutex_unlock(&port->lock);
5609 }
5610 
tcpm_send_discover_work(struct kthread_work * work)5611 static void tcpm_send_discover_work(struct kthread_work *work)
5612 {
5613 	struct tcpm_port *port = container_of(work, struct tcpm_port, send_discover_work);
5614 
5615 	mutex_lock(&port->lock);
5616 	/* No need to send DISCOVER_IDENTITY anymore */
5617 	if (!port->send_discover)
5618 		goto unlock;
5619 
5620 	if (port->data_role == TYPEC_DEVICE && port->negotiated_rev < PD_REV30) {
5621 		port->send_discover = false;
5622 		goto unlock;
5623 	}
5624 
5625 	/* Retry if the port is not idle */
5626 	if ((port->state != SRC_READY && port->state != SNK_READY) || port->vdm_sm_running) {
5627 		mod_send_discover_delayed_work(port, SEND_DISCOVER_RETRY_MS);
5628 		goto unlock;
5629 	}
5630 
5631 	tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
5632 
5633 unlock:
5634 	mutex_unlock(&port->lock);
5635 }
5636 
tcpm_dr_set(struct typec_port * p,enum typec_data_role data)5637 static int tcpm_dr_set(struct typec_port *p, enum typec_data_role data)
5638 {
5639 	struct tcpm_port *port = typec_get_drvdata(p);
5640 	int ret;
5641 
5642 	mutex_lock(&port->swap_lock);
5643 	mutex_lock(&port->lock);
5644 
5645 	if (port->typec_caps.data != TYPEC_PORT_DRD) {
5646 		ret = -EINVAL;
5647 		goto port_unlock;
5648 	}
5649 	if (port->state != SRC_READY && port->state != SNK_READY) {
5650 		ret = -EAGAIN;
5651 		goto port_unlock;
5652 	}
5653 
5654 	if (port->data_role == data) {
5655 		ret = 0;
5656 		goto port_unlock;
5657 	}
5658 
5659 	/*
5660 	 * XXX
5661 	 * 6.3.9: If an alternate mode is active, a request to swap
5662 	 * alternate modes shall trigger a port reset.
5663 	 * Reject data role swap request in this case.
5664 	 */
5665 
5666 	if (!port->pd_capable) {
5667 		/*
5668 		 * If the partner is not PD capable, reset the port to
5669 		 * trigger a role change. This can only work if a preferred
5670 		 * role is configured, and if it matches the requested role.
5671 		 */
5672 		if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
5673 		    port->try_role == port->pwr_role) {
5674 			ret = -EINVAL;
5675 			goto port_unlock;
5676 		}
5677 		port->non_pd_role_swap = true;
5678 		tcpm_set_state(port, PORT_RESET, 0);
5679 	} else {
5680 		port->upcoming_state = DR_SWAP_SEND;
5681 		ret = tcpm_ams_start(port, DATA_ROLE_SWAP);
5682 		if (ret == -EAGAIN) {
5683 			port->upcoming_state = INVALID_STATE;
5684 			goto port_unlock;
5685 		}
5686 	}
5687 
5688 	port->swap_status = 0;
5689 	port->swap_pending = true;
5690 	reinit_completion(&port->swap_complete);
5691 	mutex_unlock(&port->lock);
5692 
5693 	if (!wait_for_completion_timeout(&port->swap_complete,
5694 				msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5695 		ret = -ETIMEDOUT;
5696 	else
5697 		ret = port->swap_status;
5698 
5699 	port->non_pd_role_swap = false;
5700 	goto swap_unlock;
5701 
5702 port_unlock:
5703 	mutex_unlock(&port->lock);
5704 swap_unlock:
5705 	mutex_unlock(&port->swap_lock);
5706 	return ret;
5707 }
5708 
tcpm_pr_set(struct typec_port * p,enum typec_role role)5709 static int tcpm_pr_set(struct typec_port *p, enum typec_role role)
5710 {
5711 	struct tcpm_port *port = typec_get_drvdata(p);
5712 	int ret;
5713 
5714 	mutex_lock(&port->swap_lock);
5715 	mutex_lock(&port->lock);
5716 
5717 	if (port->port_type != TYPEC_PORT_DRP) {
5718 		ret = -EINVAL;
5719 		goto port_unlock;
5720 	}
5721 	if (port->state != SRC_READY && port->state != SNK_READY) {
5722 		ret = -EAGAIN;
5723 		goto port_unlock;
5724 	}
5725 
5726 	if (role == port->pwr_role) {
5727 		ret = 0;
5728 		goto port_unlock;
5729 	}
5730 
5731 	port->upcoming_state = PR_SWAP_SEND;
5732 	ret = tcpm_ams_start(port, POWER_ROLE_SWAP);
5733 	if (ret == -EAGAIN) {
5734 		port->upcoming_state = INVALID_STATE;
5735 		goto port_unlock;
5736 	}
5737 
5738 	port->swap_status = 0;
5739 	port->swap_pending = true;
5740 	reinit_completion(&port->swap_complete);
5741 	mutex_unlock(&port->lock);
5742 
5743 	if (!wait_for_completion_timeout(&port->swap_complete,
5744 				msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5745 		ret = -ETIMEDOUT;
5746 	else
5747 		ret = port->swap_status;
5748 
5749 	goto swap_unlock;
5750 
5751 port_unlock:
5752 	mutex_unlock(&port->lock);
5753 swap_unlock:
5754 	mutex_unlock(&port->swap_lock);
5755 	return ret;
5756 }
5757 
tcpm_vconn_set(struct typec_port * p,enum typec_role role)5758 static int tcpm_vconn_set(struct typec_port *p, enum typec_role role)
5759 {
5760 	struct tcpm_port *port = typec_get_drvdata(p);
5761 	int ret;
5762 
5763 	mutex_lock(&port->swap_lock);
5764 	mutex_lock(&port->lock);
5765 
5766 	if (port->state != SRC_READY && port->state != SNK_READY) {
5767 		ret = -EAGAIN;
5768 		goto port_unlock;
5769 	}
5770 
5771 	if (role == port->vconn_role) {
5772 		ret = 0;
5773 		goto port_unlock;
5774 	}
5775 
5776 	port->upcoming_state = VCONN_SWAP_SEND;
5777 	ret = tcpm_ams_start(port, VCONN_SWAP);
5778 	if (ret == -EAGAIN) {
5779 		port->upcoming_state = INVALID_STATE;
5780 		goto port_unlock;
5781 	}
5782 
5783 	port->swap_status = 0;
5784 	port->swap_pending = true;
5785 	reinit_completion(&port->swap_complete);
5786 	mutex_unlock(&port->lock);
5787 
5788 	if (!wait_for_completion_timeout(&port->swap_complete,
5789 				msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5790 		ret = -ETIMEDOUT;
5791 	else
5792 		ret = port->swap_status;
5793 
5794 	goto swap_unlock;
5795 
5796 port_unlock:
5797 	mutex_unlock(&port->lock);
5798 swap_unlock:
5799 	mutex_unlock(&port->swap_lock);
5800 	return ret;
5801 }
5802 
tcpm_try_role(struct typec_port * p,int role)5803 static int tcpm_try_role(struct typec_port *p, int role)
5804 {
5805 	struct tcpm_port *port = typec_get_drvdata(p);
5806 	struct tcpc_dev	*tcpc = port->tcpc;
5807 	int ret = 0;
5808 
5809 	mutex_lock(&port->lock);
5810 	if (tcpc->try_role)
5811 		ret = tcpc->try_role(tcpc, role);
5812 	if (!ret)
5813 		port->try_role = role;
5814 	port->try_src_count = 0;
5815 	port->try_snk_count = 0;
5816 	mutex_unlock(&port->lock);
5817 
5818 	return ret;
5819 }
5820 
tcpm_pps_set_op_curr(struct tcpm_port * port,u16 req_op_curr)5821 static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 req_op_curr)
5822 {
5823 	unsigned int target_mw;
5824 	int ret;
5825 
5826 	mutex_lock(&port->swap_lock);
5827 	mutex_lock(&port->lock);
5828 
5829 	if (!port->pps_data.active) {
5830 		ret = -EOPNOTSUPP;
5831 		goto port_unlock;
5832 	}
5833 
5834 	if (port->state != SNK_READY) {
5835 		ret = -EAGAIN;
5836 		goto port_unlock;
5837 	}
5838 
5839 	if (req_op_curr > port->pps_data.max_curr) {
5840 		ret = -EINVAL;
5841 		goto port_unlock;
5842 	}
5843 
5844 	target_mw = (req_op_curr * port->supply_voltage) / 1000;
5845 	if (target_mw < port->operating_snk_mw) {
5846 		ret = -EINVAL;
5847 		goto port_unlock;
5848 	}
5849 
5850 	port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5851 	ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5852 	if (ret == -EAGAIN) {
5853 		port->upcoming_state = INVALID_STATE;
5854 		goto port_unlock;
5855 	}
5856 
5857 	/* Round down operating current to align with PPS valid steps */
5858 	req_op_curr = req_op_curr - (req_op_curr % RDO_PROG_CURR_MA_STEP);
5859 
5860 	reinit_completion(&port->pps_complete);
5861 	port->pps_data.req_op_curr = req_op_curr;
5862 	port->pps_status = 0;
5863 	port->pps_pending = true;
5864 	mutex_unlock(&port->lock);
5865 
5866 	if (!wait_for_completion_timeout(&port->pps_complete,
5867 				msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5868 		ret = -ETIMEDOUT;
5869 	else
5870 		ret = port->pps_status;
5871 
5872 	goto swap_unlock;
5873 
5874 port_unlock:
5875 	mutex_unlock(&port->lock);
5876 swap_unlock:
5877 	mutex_unlock(&port->swap_lock);
5878 
5879 	return ret;
5880 }
5881 
tcpm_pps_set_out_volt(struct tcpm_port * port,u16 req_out_volt)5882 static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 req_out_volt)
5883 {
5884 	unsigned int target_mw;
5885 	int ret;
5886 
5887 	mutex_lock(&port->swap_lock);
5888 	mutex_lock(&port->lock);
5889 
5890 	if (!port->pps_data.active) {
5891 		ret = -EOPNOTSUPP;
5892 		goto port_unlock;
5893 	}
5894 
5895 	if (port->state != SNK_READY) {
5896 		ret = -EAGAIN;
5897 		goto port_unlock;
5898 	}
5899 
5900 	target_mw = (port->current_limit * req_out_volt) / 1000;
5901 	if (target_mw < port->operating_snk_mw) {
5902 		ret = -EINVAL;
5903 		goto port_unlock;
5904 	}
5905 
5906 	port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5907 	ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5908 	if (ret == -EAGAIN) {
5909 		port->upcoming_state = INVALID_STATE;
5910 		goto port_unlock;
5911 	}
5912 
5913 	/* Round down output voltage to align with PPS valid steps */
5914 	req_out_volt = req_out_volt - (req_out_volt % RDO_PROG_VOLT_MV_STEP);
5915 
5916 	reinit_completion(&port->pps_complete);
5917 	port->pps_data.req_out_volt = req_out_volt;
5918 	port->pps_status = 0;
5919 	port->pps_pending = true;
5920 	mutex_unlock(&port->lock);
5921 
5922 	if (!wait_for_completion_timeout(&port->pps_complete,
5923 				msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5924 		ret = -ETIMEDOUT;
5925 	else
5926 		ret = port->pps_status;
5927 
5928 	goto swap_unlock;
5929 
5930 port_unlock:
5931 	mutex_unlock(&port->lock);
5932 swap_unlock:
5933 	mutex_unlock(&port->swap_lock);
5934 
5935 	return ret;
5936 }
5937 
tcpm_pps_activate(struct tcpm_port * port,bool activate)5938 static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
5939 {
5940 	int ret = 0;
5941 
5942 	mutex_lock(&port->swap_lock);
5943 	mutex_lock(&port->lock);
5944 
5945 	if (!port->pps_data.supported) {
5946 		ret = -EOPNOTSUPP;
5947 		goto port_unlock;
5948 	}
5949 
5950 	/* Trying to deactivate PPS when already deactivated so just bail */
5951 	if (!port->pps_data.active && !activate)
5952 		goto port_unlock;
5953 
5954 	if (port->state != SNK_READY) {
5955 		ret = -EAGAIN;
5956 		goto port_unlock;
5957 	}
5958 
5959 	if (activate)
5960 		port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5961 	else
5962 		port->upcoming_state = SNK_NEGOTIATE_CAPABILITIES;
5963 	ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5964 	if (ret == -EAGAIN) {
5965 		port->upcoming_state = INVALID_STATE;
5966 		goto port_unlock;
5967 	}
5968 
5969 	reinit_completion(&port->pps_complete);
5970 	port->pps_status = 0;
5971 	port->pps_pending = true;
5972 
5973 	/* Trigger PPS request or move back to standard PDO contract */
5974 	if (activate) {
5975 		port->pps_data.req_out_volt = port->supply_voltage;
5976 		port->pps_data.req_op_curr = port->current_limit;
5977 	}
5978 	mutex_unlock(&port->lock);
5979 
5980 	if (!wait_for_completion_timeout(&port->pps_complete,
5981 				msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5982 		ret = -ETIMEDOUT;
5983 	else
5984 		ret = port->pps_status;
5985 
5986 	goto swap_unlock;
5987 
5988 port_unlock:
5989 	mutex_unlock(&port->lock);
5990 swap_unlock:
5991 	mutex_unlock(&port->swap_lock);
5992 
5993 	return ret;
5994 }
5995 
tcpm_init(struct tcpm_port * port)5996 static void tcpm_init(struct tcpm_port *port)
5997 {
5998 	enum typec_cc_status cc1, cc2;
5999 
6000 	port->tcpc->init(port->tcpc);
6001 
6002 	tcpm_reset_port(port);
6003 
6004 	/*
6005 	 * XXX
6006 	 * Should possibly wait for VBUS to settle if it was enabled locally
6007 	 * since tcpm_reset_port() will disable VBUS.
6008 	 */
6009 	port->vbus_present = port->tcpc->get_vbus(port->tcpc);
6010 	if (port->vbus_present)
6011 		port->vbus_never_low = true;
6012 
6013 	/*
6014 	 * 1. When vbus_present is true, voltage on VBUS is already at VSAFE5V.
6015 	 * So implicitly vbus_vsafe0v = false.
6016 	 *
6017 	 * 2. When vbus_present is false and TCPC does NOT support querying
6018 	 * vsafe0v status, then, it's best to assume vbus is at VSAFE0V i.e.
6019 	 * vbus_vsafe0v is true.
6020 	 *
6021 	 * 3. When vbus_present is false and TCPC does support querying vsafe0v,
6022 	 * then, query tcpc for vsafe0v status.
6023 	 */
6024 	if (port->vbus_present)
6025 		port->vbus_vsafe0v = false;
6026 	else if (!port->tcpc->is_vbus_vsafe0v)
6027 		port->vbus_vsafe0v = true;
6028 	else
6029 		port->vbus_vsafe0v = port->tcpc->is_vbus_vsafe0v(port->tcpc);
6030 
6031 	tcpm_set_state(port, tcpm_default_state(port), 0);
6032 
6033 	if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
6034 		_tcpm_cc_change(port, cc1, cc2);
6035 
6036 	/*
6037 	 * Some adapters need a clean slate at startup, and won't recover
6038 	 * otherwise. So do not try to be fancy and force a clean disconnect.
6039 	 */
6040 	tcpm_set_state(port, PORT_RESET, 0);
6041 }
6042 
tcpm_port_type_set(struct typec_port * p,enum typec_port_type type)6043 static int tcpm_port_type_set(struct typec_port *p, enum typec_port_type type)
6044 {
6045 	struct tcpm_port *port = typec_get_drvdata(p);
6046 
6047 	mutex_lock(&port->lock);
6048 	if (type == port->port_type)
6049 		goto port_unlock;
6050 
6051 	port->port_type = type;
6052 
6053 	if (!port->connected) {
6054 		tcpm_set_state(port, PORT_RESET, 0);
6055 	} else if (type == TYPEC_PORT_SNK) {
6056 		if (!(port->pwr_role == TYPEC_SINK &&
6057 		      port->data_role == TYPEC_DEVICE))
6058 			tcpm_set_state(port, PORT_RESET, 0);
6059 	} else if (type == TYPEC_PORT_SRC) {
6060 		if (!(port->pwr_role == TYPEC_SOURCE &&
6061 		      port->data_role == TYPEC_HOST))
6062 			tcpm_set_state(port, PORT_RESET, 0);
6063 	}
6064 
6065 port_unlock:
6066 	mutex_unlock(&port->lock);
6067 	return 0;
6068 }
6069 
6070 static const struct typec_operations tcpm_ops = {
6071 	.try_role = tcpm_try_role,
6072 	.dr_set = tcpm_dr_set,
6073 	.pr_set = tcpm_pr_set,
6074 	.vconn_set = tcpm_vconn_set,
6075 	.port_type_set = tcpm_port_type_set
6076 };
6077 
tcpm_tcpc_reset(struct tcpm_port * port)6078 void tcpm_tcpc_reset(struct tcpm_port *port)
6079 {
6080 	mutex_lock(&port->lock);
6081 	/* XXX: Maintain PD connection if possible? */
6082 	tcpm_init(port);
6083 	mutex_unlock(&port->lock);
6084 }
6085 EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
6086 
tcpm_port_unregister_pd(struct tcpm_port * port)6087 static void tcpm_port_unregister_pd(struct tcpm_port *port)
6088 {
6089 	usb_power_delivery_unregister_capabilities(port->port_sink_caps);
6090 	port->port_sink_caps = NULL;
6091 	usb_power_delivery_unregister_capabilities(port->port_source_caps);
6092 	port->port_source_caps = NULL;
6093 	usb_power_delivery_unregister(port->pd);
6094 	port->pd = NULL;
6095 }
6096 
tcpm_port_register_pd(struct tcpm_port * port)6097 static int tcpm_port_register_pd(struct tcpm_port *port)
6098 {
6099 	struct usb_power_delivery_desc desc = { port->typec_caps.pd_revision };
6100 	struct usb_power_delivery_capabilities_desc caps = { };
6101 	struct usb_power_delivery_capabilities *cap;
6102 	int ret;
6103 
6104 	if (!port->nr_src_pdo && !port->nr_snk_pdo)
6105 		return 0;
6106 
6107 	port->pd = usb_power_delivery_register(port->dev, &desc);
6108 	if (IS_ERR(port->pd)) {
6109 		ret = PTR_ERR(port->pd);
6110 		goto err_unregister;
6111 	}
6112 
6113 	if (port->nr_src_pdo) {
6114 		memcpy_and_pad(caps.pdo, sizeof(caps.pdo), port->src_pdo,
6115 			       port->nr_src_pdo * sizeof(u32), 0);
6116 		caps.role = TYPEC_SOURCE;
6117 
6118 		cap = usb_power_delivery_register_capabilities(port->pd, &caps);
6119 		if (IS_ERR(cap)) {
6120 			ret = PTR_ERR(cap);
6121 			goto err_unregister;
6122 		}
6123 
6124 		port->port_source_caps = cap;
6125 	}
6126 
6127 	if (port->nr_snk_pdo) {
6128 		memcpy_and_pad(caps.pdo, sizeof(caps.pdo), port->snk_pdo,
6129 			       port->nr_snk_pdo * sizeof(u32), 0);
6130 		caps.role = TYPEC_SINK;
6131 
6132 		cap = usb_power_delivery_register_capabilities(port->pd, &caps);
6133 		if (IS_ERR(cap)) {
6134 			ret = PTR_ERR(cap);
6135 			goto err_unregister;
6136 		}
6137 
6138 		port->port_sink_caps = cap;
6139 	}
6140 
6141 	return 0;
6142 
6143 err_unregister:
6144 	tcpm_port_unregister_pd(port);
6145 
6146 	return ret;
6147 }
6148 
tcpm_fw_get_caps(struct tcpm_port * port,struct fwnode_handle * fwnode)6149 static int tcpm_fw_get_caps(struct tcpm_port *port,
6150 			    struct fwnode_handle *fwnode)
6151 {
6152 	const char *opmode_str;
6153 	int ret;
6154 	u32 mw, frs_current;
6155 
6156 	if (!fwnode)
6157 		return -EINVAL;
6158 
6159 	/*
6160 	 * This fwnode has a "compatible" property, but is never populated as a
6161 	 * struct device. Instead we simply parse it to read the properties.
6162 	 * This it breaks fw_devlink=on. To maintain backward compatibility
6163 	 * with existing DT files, we work around this by deleting any
6164 	 * fwnode_links to/from this fwnode.
6165 	 */
6166 	fw_devlink_purge_absent_suppliers(fwnode);
6167 
6168 	ret = typec_get_fw_cap(&port->typec_caps, fwnode);
6169 	if (ret < 0)
6170 		return ret;
6171 
6172 	port->port_type = port->typec_caps.type;
6173 	port->pd_supported = !fwnode_property_read_bool(fwnode, "pd-disable");
6174 
6175 	port->slow_charger_loop = fwnode_property_read_bool(fwnode, "slow-charger-loop");
6176 	if (port->port_type == TYPEC_PORT_SNK)
6177 		goto sink;
6178 
6179 	/* Get Source PDOs for the PD port or Source Rp value for the non-PD port */
6180 	if (port->pd_supported) {
6181 		ret = fwnode_property_count_u32(fwnode, "source-pdos");
6182 		if (ret == 0)
6183 			return -EINVAL;
6184 		else if (ret < 0)
6185 			return ret;
6186 
6187 		port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
6188 		ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
6189 						     port->src_pdo, port->nr_src_pdo);
6190 		if (ret)
6191 			return ret;
6192 		ret = tcpm_validate_caps(port, port->src_pdo, port->nr_src_pdo);
6193 		if (ret)
6194 			return ret;
6195 	} else {
6196 		ret = fwnode_property_read_string(fwnode, "typec-power-opmode", &opmode_str);
6197 		if (ret)
6198 			return ret;
6199 		ret = typec_find_pwr_opmode(opmode_str);
6200 		if (ret < 0)
6201 			return ret;
6202 		port->src_rp = tcpm_pwr_opmode_to_rp(ret);
6203 	}
6204 
6205 	if (port->port_type == TYPEC_PORT_SRC)
6206 		return 0;
6207 
6208 sink:
6209 	port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
6210 
6211 	if (!port->pd_supported)
6212 		return 0;
6213 
6214 	/* Get sink pdos */
6215 	ret = fwnode_property_count_u32(fwnode, "sink-pdos");
6216 	if (ret <= 0)
6217 		return -EINVAL;
6218 
6219 	port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
6220 	ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
6221 					     port->snk_pdo, port->nr_snk_pdo);
6222 	if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo,
6223 					    port->nr_snk_pdo))
6224 		return -EINVAL;
6225 
6226 	if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0)
6227 		return -EINVAL;
6228 	port->operating_snk_mw = mw / 1000;
6229 
6230 	/* FRS can only be supported by DRP ports */
6231 	if (port->port_type == TYPEC_PORT_DRP) {
6232 		ret = fwnode_property_read_u32(fwnode, "new-source-frs-typec-current",
6233 					       &frs_current);
6234 		if (ret >= 0 && frs_current <= FRS_5V_3A)
6235 			port->new_source_frs_current = frs_current;
6236 	}
6237 
6238 	/* sink-vdos is optional */
6239 	ret = fwnode_property_count_u32(fwnode, "sink-vdos");
6240 	if (ret < 0)
6241 		ret = 0;
6242 
6243 	port->nr_snk_vdo = min(ret, VDO_MAX_OBJECTS);
6244 	if (port->nr_snk_vdo) {
6245 		ret = fwnode_property_read_u32_array(fwnode, "sink-vdos",
6246 						     port->snk_vdo,
6247 						     port->nr_snk_vdo);
6248 		if (ret < 0)
6249 			return ret;
6250 	}
6251 
6252 	/* If sink-vdos is found, sink-vdos-v1 is expected for backward compatibility. */
6253 	if (port->nr_snk_vdo) {
6254 		ret = fwnode_property_count_u32(fwnode, "sink-vdos-v1");
6255 		if (ret < 0)
6256 			return ret;
6257 		else if (ret == 0)
6258 			return -ENODATA;
6259 
6260 		port->nr_snk_vdo_v1 = min(ret, VDO_MAX_OBJECTS);
6261 		ret = fwnode_property_read_u32_array(fwnode, "sink-vdos-v1",
6262 						     port->snk_vdo_v1,
6263 						     port->nr_snk_vdo_v1);
6264 		if (ret < 0)
6265 			return ret;
6266 	}
6267 
6268 	return 0;
6269 }
6270 
6271 /* Power Supply access to expose source power information */
6272 enum tcpm_psy_online_states {
6273 	TCPM_PSY_OFFLINE = 0,
6274 	TCPM_PSY_FIXED_ONLINE,
6275 	TCPM_PSY_PROG_ONLINE,
6276 };
6277 
6278 static enum power_supply_property tcpm_psy_props[] = {
6279 	POWER_SUPPLY_PROP_USB_TYPE,
6280 	POWER_SUPPLY_PROP_ONLINE,
6281 	POWER_SUPPLY_PROP_VOLTAGE_MIN,
6282 	POWER_SUPPLY_PROP_VOLTAGE_MAX,
6283 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
6284 	POWER_SUPPLY_PROP_CURRENT_MAX,
6285 	POWER_SUPPLY_PROP_CURRENT_NOW,
6286 };
6287 
tcpm_psy_get_online(struct tcpm_port * port,union power_supply_propval * val)6288 static int tcpm_psy_get_online(struct tcpm_port *port,
6289 			       union power_supply_propval *val)
6290 {
6291 	if (port->vbus_charge) {
6292 		if (port->pps_data.active)
6293 			val->intval = TCPM_PSY_PROG_ONLINE;
6294 		else
6295 			val->intval = TCPM_PSY_FIXED_ONLINE;
6296 	} else {
6297 		val->intval = TCPM_PSY_OFFLINE;
6298 	}
6299 
6300 	return 0;
6301 }
6302 
tcpm_psy_get_voltage_min(struct tcpm_port * port,union power_supply_propval * val)6303 static int tcpm_psy_get_voltage_min(struct tcpm_port *port,
6304 				    union power_supply_propval *val)
6305 {
6306 	if (port->pps_data.active)
6307 		val->intval = port->pps_data.min_volt * 1000;
6308 	else
6309 		val->intval = port->supply_voltage * 1000;
6310 
6311 	return 0;
6312 }
6313 
tcpm_psy_get_voltage_max(struct tcpm_port * port,union power_supply_propval * val)6314 static int tcpm_psy_get_voltage_max(struct tcpm_port *port,
6315 				    union power_supply_propval *val)
6316 {
6317 	if (port->pps_data.active)
6318 		val->intval = port->pps_data.max_volt * 1000;
6319 	else
6320 		val->intval = port->supply_voltage * 1000;
6321 
6322 	return 0;
6323 }
6324 
tcpm_psy_get_voltage_now(struct tcpm_port * port,union power_supply_propval * val)6325 static int tcpm_psy_get_voltage_now(struct tcpm_port *port,
6326 				    union power_supply_propval *val)
6327 {
6328 	val->intval = port->supply_voltage * 1000;
6329 
6330 	return 0;
6331 }
6332 
tcpm_psy_get_current_max(struct tcpm_port * port,union power_supply_propval * val)6333 static int tcpm_psy_get_current_max(struct tcpm_port *port,
6334 				    union power_supply_propval *val)
6335 {
6336 	if (port->pps_data.active)
6337 		val->intval = port->pps_data.max_curr * 1000;
6338 	else
6339 		val->intval = port->current_limit * 1000;
6340 
6341 	return 0;
6342 }
6343 
tcpm_psy_get_current_now(struct tcpm_port * port,union power_supply_propval * val)6344 static int tcpm_psy_get_current_now(struct tcpm_port *port,
6345 				    union power_supply_propval *val)
6346 {
6347 	val->intval = port->current_limit * 1000;
6348 
6349 	return 0;
6350 }
6351 
tcpm_psy_get_input_power_limit(struct tcpm_port * port,union power_supply_propval * val)6352 static int tcpm_psy_get_input_power_limit(struct tcpm_port *port,
6353 					  union power_supply_propval *val)
6354 {
6355 	unsigned int src_mv, src_ma, max_src_uw = 0;
6356 	unsigned int i, tmp;
6357 
6358 	for (i = 0; i < port->nr_source_caps; i++) {
6359 		u32 pdo = port->source_caps[i];
6360 
6361 		if (pdo_type(pdo) == PDO_TYPE_FIXED) {
6362 			src_mv = pdo_fixed_voltage(pdo);
6363 			src_ma = pdo_max_current(pdo);
6364 			tmp = src_mv * src_ma;
6365 			max_src_uw = tmp > max_src_uw ? tmp : max_src_uw;
6366 		}
6367 	}
6368 
6369 	val->intval = max_src_uw;
6370 	return 0;
6371 }
6372 
tcpm_psy_get_prop(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)6373 static int tcpm_psy_get_prop(struct power_supply *psy,
6374 			     enum power_supply_property psp,
6375 			     union power_supply_propval *val)
6376 {
6377 	struct tcpm_port *port = power_supply_get_drvdata(psy);
6378 	int ret = 0;
6379 
6380 	switch (psp) {
6381 	case POWER_SUPPLY_PROP_USB_TYPE:
6382 		val->intval = port->usb_type;
6383 		break;
6384 	case POWER_SUPPLY_PROP_ONLINE:
6385 		ret = tcpm_psy_get_online(port, val);
6386 		break;
6387 	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
6388 		ret = tcpm_psy_get_voltage_min(port, val);
6389 		break;
6390 	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
6391 		ret = tcpm_psy_get_voltage_max(port, val);
6392 		break;
6393 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6394 		ret = tcpm_psy_get_voltage_now(port, val);
6395 		break;
6396 	case POWER_SUPPLY_PROP_CURRENT_MAX:
6397 		ret = tcpm_psy_get_current_max(port, val);
6398 		break;
6399 	case POWER_SUPPLY_PROP_CURRENT_NOW:
6400 		ret = tcpm_psy_get_current_now(port, val);
6401 		break;
6402 	case POWER_SUPPLY_PROP_INPUT_POWER_LIMIT:
6403 		tcpm_psy_get_input_power_limit(port, val);
6404 		break;
6405 	default:
6406 		ret = -EINVAL;
6407 		break;
6408 	}
6409 
6410 	return ret;
6411 }
6412 
tcpm_psy_set_online(struct tcpm_port * port,const union power_supply_propval * val)6413 static int tcpm_psy_set_online(struct tcpm_port *port,
6414 			       const union power_supply_propval *val)
6415 {
6416 	int ret;
6417 
6418 	switch (val->intval) {
6419 	case TCPM_PSY_FIXED_ONLINE:
6420 		ret = tcpm_pps_activate(port, false);
6421 		break;
6422 	case TCPM_PSY_PROG_ONLINE:
6423 		ret = tcpm_pps_activate(port, true);
6424 		break;
6425 	default:
6426 		ret = -EINVAL;
6427 		break;
6428 	}
6429 
6430 	return ret;
6431 }
6432 
tcpm_psy_set_prop(struct power_supply * psy,enum power_supply_property psp,const union power_supply_propval * val)6433 static int tcpm_psy_set_prop(struct power_supply *psy,
6434 			     enum power_supply_property psp,
6435 			     const union power_supply_propval *val)
6436 {
6437 	struct tcpm_port *port = power_supply_get_drvdata(psy);
6438 	int ret;
6439 
6440 	/*
6441 	 * All the properties below are related to USB PD. The check needs to be
6442 	 * property specific when a non-pd related property is added.
6443 	 */
6444 	if (!port->pd_supported)
6445 		return -EOPNOTSUPP;
6446 
6447 	switch (psp) {
6448 	case POWER_SUPPLY_PROP_ONLINE:
6449 		ret = tcpm_psy_set_online(port, val);
6450 		break;
6451 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6452 		ret = tcpm_pps_set_out_volt(port, val->intval / 1000);
6453 		break;
6454 	case POWER_SUPPLY_PROP_CURRENT_NOW:
6455 		if (val->intval > port->pps_data.max_curr * 1000)
6456 			ret = -EINVAL;
6457 		else
6458 			ret = tcpm_pps_set_op_curr(port, val->intval / 1000);
6459 		break;
6460 	default:
6461 		ret = -EINVAL;
6462 		break;
6463 	}
6464 	power_supply_changed(port->psy);
6465 	return ret;
6466 }
6467 
tcpm_psy_prop_writeable(struct power_supply * psy,enum power_supply_property psp)6468 static int tcpm_psy_prop_writeable(struct power_supply *psy,
6469 				   enum power_supply_property psp)
6470 {
6471 	switch (psp) {
6472 	case POWER_SUPPLY_PROP_ONLINE:
6473 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6474 	case POWER_SUPPLY_PROP_CURRENT_NOW:
6475 		return 1;
6476 	default:
6477 		return 0;
6478 	}
6479 }
6480 
6481 static enum power_supply_usb_type tcpm_psy_usb_types[] = {
6482 	POWER_SUPPLY_USB_TYPE_C,
6483 	POWER_SUPPLY_USB_TYPE_PD,
6484 	POWER_SUPPLY_USB_TYPE_PD_PPS,
6485 };
6486 
6487 static const char *tcpm_psy_name_prefix = "tcpm-source-psy-";
6488 
devm_tcpm_psy_register(struct tcpm_port * port)6489 static int devm_tcpm_psy_register(struct tcpm_port *port)
6490 {
6491 	struct power_supply_config psy_cfg = {};
6492 	const char *port_dev_name = dev_name(port->dev);
6493 	size_t psy_name_len = strlen(tcpm_psy_name_prefix) +
6494 				     strlen(port_dev_name) + 1;
6495 	char *psy_name;
6496 
6497 	psy_cfg.drv_data = port;
6498 	psy_cfg.fwnode = dev_fwnode(port->dev);
6499 	psy_name = devm_kzalloc(port->dev, psy_name_len, GFP_KERNEL);
6500 	if (!psy_name)
6501 		return -ENOMEM;
6502 
6503 	snprintf(psy_name, psy_name_len, "%s%s", tcpm_psy_name_prefix,
6504 		 port_dev_name);
6505 	port->psy_desc.name = psy_name;
6506 	port->psy_desc.type = POWER_SUPPLY_TYPE_USB;
6507 	port->psy_desc.usb_types = tcpm_psy_usb_types;
6508 	port->psy_desc.num_usb_types = ARRAY_SIZE(tcpm_psy_usb_types);
6509 	port->psy_desc.properties = tcpm_psy_props;
6510 	port->psy_desc.num_properties = ARRAY_SIZE(tcpm_psy_props);
6511 	port->psy_desc.get_property = tcpm_psy_get_prop;
6512 	port->psy_desc.set_property = tcpm_psy_set_prop;
6513 	port->psy_desc.property_is_writeable = tcpm_psy_prop_writeable;
6514 
6515 	port->usb_type = POWER_SUPPLY_USB_TYPE_C;
6516 
6517 	port->psy = devm_power_supply_register(port->dev, &port->psy_desc,
6518 					       &psy_cfg);
6519 
6520 	return PTR_ERR_OR_ZERO(port->psy);
6521 }
6522 
state_machine_timer_handler(struct hrtimer * timer)6523 static enum hrtimer_restart state_machine_timer_handler(struct hrtimer *timer)
6524 {
6525 	struct tcpm_port *port = container_of(timer, struct tcpm_port, state_machine_timer);
6526 
6527 	if (port->registered)
6528 		kthread_queue_work(port->wq, &port->state_machine);
6529 	return HRTIMER_NORESTART;
6530 }
6531 
vdm_state_machine_timer_handler(struct hrtimer * timer)6532 static enum hrtimer_restart vdm_state_machine_timer_handler(struct hrtimer *timer)
6533 {
6534 	struct tcpm_port *port = container_of(timer, struct tcpm_port, vdm_state_machine_timer);
6535 
6536 	if (port->registered)
6537 		kthread_queue_work(port->wq, &port->vdm_state_machine);
6538 	return HRTIMER_NORESTART;
6539 }
6540 
enable_frs_timer_handler(struct hrtimer * timer)6541 static enum hrtimer_restart enable_frs_timer_handler(struct hrtimer *timer)
6542 {
6543 	struct tcpm_port *port = container_of(timer, struct tcpm_port, enable_frs_timer);
6544 
6545 	if (port->registered)
6546 		kthread_queue_work(port->wq, &port->enable_frs);
6547 	return HRTIMER_NORESTART;
6548 }
6549 
send_discover_timer_handler(struct hrtimer * timer)6550 static enum hrtimer_restart send_discover_timer_handler(struct hrtimer *timer)
6551 {
6552 	struct tcpm_port *port = container_of(timer, struct tcpm_port, send_discover_timer);
6553 
6554 	if (port->registered)
6555 		kthread_queue_work(port->wq, &port->send_discover_work);
6556 	return HRTIMER_NORESTART;
6557 }
6558 
tcpm_register_port(struct device * dev,struct tcpc_dev * tcpc)6559 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
6560 {
6561 	struct tcpm_port *port;
6562 	int err;
6563 
6564 	if (!dev || !tcpc ||
6565 	    !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
6566 	    !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
6567 	    !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
6568 		return ERR_PTR(-EINVAL);
6569 
6570 	port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
6571 	if (!port)
6572 		return ERR_PTR(-ENOMEM);
6573 
6574 	port->dev = dev;
6575 	port->tcpc = tcpc;
6576 
6577 	mutex_init(&port->lock);
6578 	mutex_init(&port->swap_lock);
6579 
6580 	port->wq = kthread_create_worker(0, dev_name(dev));
6581 	if (IS_ERR(port->wq))
6582 		return ERR_CAST(port->wq);
6583 	sched_set_fifo(port->wq->task);
6584 
6585 	kthread_init_work(&port->state_machine, tcpm_state_machine_work);
6586 	kthread_init_work(&port->vdm_state_machine, vdm_state_machine_work);
6587 	kthread_init_work(&port->event_work, tcpm_pd_event_handler);
6588 	kthread_init_work(&port->enable_frs, tcpm_enable_frs_work);
6589 	kthread_init_work(&port->send_discover_work, tcpm_send_discover_work);
6590 	hrtimer_init(&port->state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6591 	port->state_machine_timer.function = state_machine_timer_handler;
6592 	hrtimer_init(&port->vdm_state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6593 	port->vdm_state_machine_timer.function = vdm_state_machine_timer_handler;
6594 	hrtimer_init(&port->enable_frs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6595 	port->enable_frs_timer.function = enable_frs_timer_handler;
6596 	hrtimer_init(&port->send_discover_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6597 	port->send_discover_timer.function = send_discover_timer_handler;
6598 
6599 	spin_lock_init(&port->pd_event_lock);
6600 
6601 	init_completion(&port->tx_complete);
6602 	init_completion(&port->swap_complete);
6603 	init_completion(&port->pps_complete);
6604 	tcpm_debugfs_init(port);
6605 
6606 	err = tcpm_fw_get_caps(port, tcpc->fwnode);
6607 	if (err < 0)
6608 		goto out_destroy_wq;
6609 
6610 	port->try_role = port->typec_caps.prefer_role;
6611 
6612 	port->typec_caps.fwnode = tcpc->fwnode;
6613 	port->typec_caps.revision = 0x0120;	/* Type-C spec release 1.2 */
6614 	port->typec_caps.pd_revision = 0x0300;	/* USB-PD spec release 3.0 */
6615 	port->typec_caps.svdm_version = SVDM_VER_2_0;
6616 	port->typec_caps.driver_data = port;
6617 	port->typec_caps.ops = &tcpm_ops;
6618 	port->typec_caps.orientation_aware = 1;
6619 
6620 	port->partner_desc.identity = &port->partner_ident;
6621 	port->port_type = port->typec_caps.type;
6622 
6623 	port->role_sw = usb_role_switch_get(port->dev);
6624 	if (!port->role_sw)
6625 		port->role_sw = fwnode_usb_role_switch_get(tcpc->fwnode);
6626 	if (IS_ERR(port->role_sw)) {
6627 		err = PTR_ERR(port->role_sw);
6628 		goto out_destroy_wq;
6629 	}
6630 
6631 	err = devm_tcpm_psy_register(port);
6632 	if (err)
6633 		goto out_role_sw_put;
6634 	power_supply_changed(port->psy);
6635 
6636 	err = tcpm_port_register_pd(port);
6637 	if (err)
6638 		goto out_role_sw_put;
6639 
6640 	port->typec_caps.pd = port->pd;
6641 
6642 	port->typec_port = typec_register_port(port->dev, &port->typec_caps);
6643 	if (IS_ERR(port->typec_port)) {
6644 		err = PTR_ERR(port->typec_port);
6645 		goto out_unregister_pd;
6646 	}
6647 
6648 	typec_port_register_altmodes(port->typec_port,
6649 				     &tcpm_altmode_ops, port,
6650 				     port->port_altmode, ALTMODE_DISCOVERY_MAX);
6651 	port->registered = true;
6652 
6653 	mutex_lock(&port->lock);
6654 	tcpm_init(port);
6655 	mutex_unlock(&port->lock);
6656 
6657 	tcpm_log(port, "%s: registered", dev_name(dev));
6658 	return port;
6659 
6660 out_unregister_pd:
6661 	tcpm_port_unregister_pd(port);
6662 out_role_sw_put:
6663 	usb_role_switch_put(port->role_sw);
6664 out_destroy_wq:
6665 	tcpm_debugfs_exit(port);
6666 	kthread_destroy_worker(port->wq);
6667 	return ERR_PTR(err);
6668 }
6669 EXPORT_SYMBOL_GPL(tcpm_register_port);
6670 
tcpm_unregister_port(struct tcpm_port * port)6671 void tcpm_unregister_port(struct tcpm_port *port)
6672 {
6673 	int i;
6674 
6675 	port->registered = false;
6676 	kthread_destroy_worker(port->wq);
6677 
6678 	hrtimer_cancel(&port->send_discover_timer);
6679 	hrtimer_cancel(&port->enable_frs_timer);
6680 	hrtimer_cancel(&port->vdm_state_machine_timer);
6681 	hrtimer_cancel(&port->state_machine_timer);
6682 
6683 	tcpm_reset_port(port);
6684 
6685 	tcpm_port_unregister_pd(port);
6686 
6687 	for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
6688 		typec_unregister_altmode(port->port_altmode[i]);
6689 	typec_unregister_port(port->typec_port);
6690 	usb_role_switch_put(port->role_sw);
6691 	tcpm_debugfs_exit(port);
6692 }
6693 EXPORT_SYMBOL_GPL(tcpm_unregister_port);
6694 
6695 MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>");
6696 MODULE_DESCRIPTION("USB Type-C Port Manager");
6697 MODULE_LICENSE("GPL");
6698