1 /*
2  * Copyright (C) ST-Ericsson SA 2012
3  *
4  * Charger driver for AB8500
5  *
6  * License Terms: GNU General Public License v2
7  * Author:
8  *	Johan Palsson <johan.palsson@stericsson.com>
9  *	Karl Komierowski <karl.komierowski@stericsson.com>
10  *	Arun R Murthy <arun.murthy@stericsson.com>
11  */
12 
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/device.h>
16 #include <linux/interrupt.h>
17 #include <linux/delay.h>
18 #include <linux/notifier.h>
19 #include <linux/slab.h>
20 #include <linux/platform_device.h>
21 #include <linux/power_supply.h>
22 #include <linux/completion.h>
23 #include <linux/regulator/consumer.h>
24 #include <linux/err.h>
25 #include <linux/workqueue.h>
26 #include <linux/kobject.h>
27 #include <linux/of.h>
28 #include <linux/mfd/core.h>
29 #include <linux/mfd/abx500/ab8500.h>
30 #include <linux/mfd/abx500.h>
31 #include <linux/mfd/abx500/ab8500-bm.h>
32 #include <linux/mfd/abx500/ab8500-gpadc.h>
33 #include <linux/mfd/abx500/ux500_chargalg.h>
34 #include <linux/usb/otg.h>
35 #include <linux/mutex.h>
36 
37 /* Charger constants */
38 #define NO_PW_CONN			0
39 #define AC_PW_CONN			1
40 #define USB_PW_CONN			2
41 
42 #define MAIN_WDOG_ENA			0x01
43 #define MAIN_WDOG_KICK			0x02
44 #define MAIN_WDOG_DIS			0x00
45 #define CHARG_WD_KICK			0x01
46 #define MAIN_CH_ENA			0x01
47 #define MAIN_CH_NO_OVERSHOOT_ENA_N	0x02
48 #define USB_CH_ENA			0x01
49 #define USB_CHG_NO_OVERSHOOT_ENA_N	0x02
50 #define MAIN_CH_DET			0x01
51 #define MAIN_CH_CV_ON			0x04
52 #define USB_CH_CV_ON			0x08
53 #define VBUS_DET_DBNC100		0x02
54 #define VBUS_DET_DBNC1			0x01
55 #define OTP_ENABLE_WD			0x01
56 #define DROP_COUNT_RESET		0x01
57 #define USB_CH_DET			0x01
58 
59 #define MAIN_CH_INPUT_CURR_SHIFT	4
60 #define VBUS_IN_CURR_LIM_SHIFT		4
61 #define AUTO_VBUS_IN_CURR_LIM_SHIFT	4
62 #define VBUS_IN_CURR_LIM_RETRY_SET_TIME	30 /* seconds */
63 
64 #define LED_INDICATOR_PWM_ENA		0x01
65 #define LED_INDICATOR_PWM_DIS		0x00
66 #define LED_IND_CUR_5MA			0x04
67 #define LED_INDICATOR_PWM_DUTY_252_256	0xBF
68 
69 /* HW failure constants */
70 #define MAIN_CH_TH_PROT			0x02
71 #define VBUS_CH_NOK			0x08
72 #define USB_CH_TH_PROT			0x02
73 #define VBUS_OVV_TH			0x01
74 #define MAIN_CH_NOK			0x01
75 #define VBUS_DET			0x80
76 
77 #define MAIN_CH_STATUS2_MAINCHGDROP		0x80
78 #define MAIN_CH_STATUS2_MAINCHARGERDETDBNC	0x40
79 #define USB_CH_VBUSDROP				0x40
80 #define USB_CH_VBUSDETDBNC			0x01
81 
82 /* UsbLineStatus register bit masks */
83 #define AB8500_USB_LINK_STATUS		0x78
84 #define AB8505_USB_LINK_STATUS		0xF8
85 #define AB8500_STD_HOST_SUSP		0x18
86 #define USB_LINK_STATUS_SHIFT		3
87 
88 /* Watchdog timeout constant */
89 #define WD_TIMER			0x30 /* 4min */
90 #define WD_KICK_INTERVAL		(60 * HZ)
91 
92 /* Lowest charger voltage is 3.39V -> 0x4E */
93 #define LOW_VOLT_REG			0x4E
94 
95 /* Step up/down delay in us */
96 #define STEP_UDELAY			1000
97 
98 #define CHARGER_STATUS_POLL 10 /* in ms */
99 
100 #define CHG_WD_INTERVAL			(60 * HZ)
101 
102 #define AB8500_SW_CONTROL_FALLBACK	0x03
103 /* Wait for enumeration before charing in us */
104 #define WAIT_ACA_RID_ENUMERATION	(5 * 1000)
105 /*External charger control*/
106 #define AB8500_SYS_CHARGER_CONTROL_REG		0x52
107 #define EXTERNAL_CHARGER_DISABLE_REG_VAL	0x03
108 #define EXTERNAL_CHARGER_ENABLE_REG_VAL		0x07
109 
110 /* UsbLineStatus register - usb types */
111 enum ab8500_charger_link_status {
112 	USB_STAT_NOT_CONFIGURED,
113 	USB_STAT_STD_HOST_NC,
114 	USB_STAT_STD_HOST_C_NS,
115 	USB_STAT_STD_HOST_C_S,
116 	USB_STAT_HOST_CHG_NM,
117 	USB_STAT_HOST_CHG_HS,
118 	USB_STAT_HOST_CHG_HS_CHIRP,
119 	USB_STAT_DEDICATED_CHG,
120 	USB_STAT_ACA_RID_A,
121 	USB_STAT_ACA_RID_B,
122 	USB_STAT_ACA_RID_C_NM,
123 	USB_STAT_ACA_RID_C_HS,
124 	USB_STAT_ACA_RID_C_HS_CHIRP,
125 	USB_STAT_HM_IDGND,
126 	USB_STAT_RESERVED,
127 	USB_STAT_NOT_VALID_LINK,
128 	USB_STAT_PHY_EN,
129 	USB_STAT_SUP_NO_IDGND_VBUS,
130 	USB_STAT_SUP_IDGND_VBUS,
131 	USB_STAT_CHARGER_LINE_1,
132 	USB_STAT_CARKIT_1,
133 	USB_STAT_CARKIT_2,
134 	USB_STAT_ACA_DOCK_CHARGER,
135 };
136 
137 enum ab8500_usb_state {
138 	AB8500_BM_USB_STATE_RESET_HS,	/* HighSpeed Reset */
139 	AB8500_BM_USB_STATE_RESET_FS,	/* FullSpeed/LowSpeed Reset */
140 	AB8500_BM_USB_STATE_CONFIGURED,
141 	AB8500_BM_USB_STATE_SUSPEND,
142 	AB8500_BM_USB_STATE_RESUME,
143 	AB8500_BM_USB_STATE_MAX,
144 };
145 
146 /* VBUS input current limits supported in AB8500 in mA */
147 #define USB_CH_IP_CUR_LVL_0P05		50
148 #define USB_CH_IP_CUR_LVL_0P09		98
149 #define USB_CH_IP_CUR_LVL_0P19		193
150 #define USB_CH_IP_CUR_LVL_0P29		290
151 #define USB_CH_IP_CUR_LVL_0P38		380
152 #define USB_CH_IP_CUR_LVL_0P45		450
153 #define USB_CH_IP_CUR_LVL_0P5		500
154 #define USB_CH_IP_CUR_LVL_0P6		600
155 #define USB_CH_IP_CUR_LVL_0P7		700
156 #define USB_CH_IP_CUR_LVL_0P8		800
157 #define USB_CH_IP_CUR_LVL_0P9		900
158 #define USB_CH_IP_CUR_LVL_1P0		1000
159 #define USB_CH_IP_CUR_LVL_1P1		1100
160 #define USB_CH_IP_CUR_LVL_1P3		1300
161 #define USB_CH_IP_CUR_LVL_1P4		1400
162 #define USB_CH_IP_CUR_LVL_1P5		1500
163 
164 #define VBAT_TRESH_IP_CUR_RED		3800
165 
166 #define to_ab8500_charger_usb_device_info(x) container_of((x), \
167 	struct ab8500_charger, usb_chg)
168 #define to_ab8500_charger_ac_device_info(x) container_of((x), \
169 	struct ab8500_charger, ac_chg)
170 
171 /**
172  * struct ab8500_charger_interrupts - ab8500 interupts
173  * @name:	name of the interrupt
174  * @isr		function pointer to the isr
175  */
176 struct ab8500_charger_interrupts {
177 	char *name;
178 	irqreturn_t (*isr)(int irq, void *data);
179 };
180 
181 struct ab8500_charger_info {
182 	int charger_connected;
183 	int charger_online;
184 	int charger_voltage;
185 	int cv_active;
186 	bool wd_expired;
187 	int charger_current;
188 };
189 
190 struct ab8500_charger_event_flags {
191 	bool mainextchnotok;
192 	bool main_thermal_prot;
193 	bool usb_thermal_prot;
194 	bool vbus_ovv;
195 	bool usbchargernotok;
196 	bool chgwdexp;
197 	bool vbus_collapse;
198 	bool vbus_drop_end;
199 };
200 
201 struct ab8500_charger_usb_state {
202 	int usb_current;
203 	int usb_current_tmp;
204 	enum ab8500_usb_state state;
205 	enum ab8500_usb_state state_tmp;
206 	spinlock_t usb_lock;
207 };
208 
209 struct ab8500_charger_max_usb_in_curr {
210 	int usb_type_max;
211 	int set_max;
212 	int calculated_max;
213 };
214 
215 /**
216  * struct ab8500_charger - ab8500 Charger device information
217  * @dev:		Pointer to the structure device
218  * @vbus_detected:	VBUS detected
219  * @vbus_detected_start:
220  *			VBUS detected during startup
221  * @ac_conn:		This will be true when the AC charger has been plugged
222  * @vddadc_en_ac:	Indicate if VDD ADC supply is enabled because AC
223  *			charger is enabled
224  * @vddadc_en_usb:	Indicate if VDD ADC supply is enabled because USB
225  *			charger is enabled
226  * @vbat		Battery voltage
227  * @old_vbat		Previously measured battery voltage
228  * @usb_device_is_unrecognised	USB device is unrecognised by the hardware
229  * @autopower		Indicate if we should have automatic pwron after pwrloss
230  * @autopower_cfg	platform specific power config support for "pwron after pwrloss"
231  * @invalid_charger_detect_state State when forcing AB to use invalid charger
232  * @is_aca_rid:		Incicate if accessory is ACA type
233  * @current_stepping_sessions:
234  *			Counter for current stepping sessions
235  * @parent:		Pointer to the struct ab8500
236  * @gpadc:		Pointer to the struct gpadc
237  * @bm:           	Platform specific battery management information
238  * @flags:		Structure for information about events triggered
239  * @usb_state:		Structure for usb stack information
240  * @max_usb_in_curr:	Max USB charger input current
241  * @ac_chg:		AC charger power supply
242  * @usb_chg:		USB charger power supply
243  * @ac:			Structure that holds the AC charger properties
244  * @usb:		Structure that holds the USB charger properties
245  * @regu:		Pointer to the struct regulator
246  * @charger_wq:		Work queue for the IRQs and checking HW state
247  * @usb_ipt_crnt_lock:	Lock to protect VBUS input current setting from mutuals
248  * @pm_lock:		Lock to prevent system to suspend
249  * @check_vbat_work	Work for checking vbat threshold to adjust vbus current
250  * @check_hw_failure_work:	Work for checking HW state
251  * @check_usbchgnotok_work:	Work for checking USB charger not ok status
252  * @kick_wd_work:		Work for kicking the charger watchdog in case
253  *				of ABB rev 1.* due to the watchog logic bug
254  * @ac_charger_attached_work:	Work for checking if AC charger is still
255  *				connected
256  * @usb_charger_attached_work:	Work for checking if USB charger is still
257  *				connected
258  * @ac_work:			Work for checking AC charger connection
259  * @detect_usb_type_work:	Work for detecting the USB type connected
260  * @usb_link_status_work:	Work for checking the new USB link status
261  * @usb_state_changed_work:	Work for checking USB state
262  * @attach_work:		Work for detecting USB type
263  * @vbus_drop_end_work:		Work for detecting VBUS drop end
264  * @check_main_thermal_prot_work:
265  *				Work for checking Main thermal status
266  * @check_usb_thermal_prot_work:
267  *				Work for checking USB thermal status
268  * @charger_attached_mutex:	For controlling the wakelock
269  */
270 struct ab8500_charger {
271 	struct device *dev;
272 	bool vbus_detected;
273 	bool vbus_detected_start;
274 	bool ac_conn;
275 	bool vddadc_en_ac;
276 	bool vddadc_en_usb;
277 	int vbat;
278 	int old_vbat;
279 	bool usb_device_is_unrecognised;
280 	bool autopower;
281 	bool autopower_cfg;
282 	int invalid_charger_detect_state;
283 	int is_aca_rid;
284 	atomic_t current_stepping_sessions;
285 	struct ab8500 *parent;
286 	struct ab8500_gpadc *gpadc;
287 	struct abx500_bm_data *bm;
288 	struct ab8500_charger_event_flags flags;
289 	struct ab8500_charger_usb_state usb_state;
290 	struct ab8500_charger_max_usb_in_curr max_usb_in_curr;
291 	struct ux500_charger ac_chg;
292 	struct ux500_charger usb_chg;
293 	struct ab8500_charger_info ac;
294 	struct ab8500_charger_info usb;
295 	struct regulator *regu;
296 	struct workqueue_struct *charger_wq;
297 	struct mutex usb_ipt_crnt_lock;
298 	struct delayed_work check_vbat_work;
299 	struct delayed_work check_hw_failure_work;
300 	struct delayed_work check_usbchgnotok_work;
301 	struct delayed_work kick_wd_work;
302 	struct delayed_work usb_state_changed_work;
303 	struct delayed_work attach_work;
304 	struct delayed_work ac_charger_attached_work;
305 	struct delayed_work usb_charger_attached_work;
306 	struct delayed_work vbus_drop_end_work;
307 	struct work_struct ac_work;
308 	struct work_struct detect_usb_type_work;
309 	struct work_struct usb_link_status_work;
310 	struct work_struct check_main_thermal_prot_work;
311 	struct work_struct check_usb_thermal_prot_work;
312 	struct usb_phy *usb_phy;
313 	struct notifier_block nb;
314 	struct mutex charger_attached_mutex;
315 };
316 
317 /* AC properties */
318 static enum power_supply_property ab8500_charger_ac_props[] = {
319 	POWER_SUPPLY_PROP_HEALTH,
320 	POWER_SUPPLY_PROP_PRESENT,
321 	POWER_SUPPLY_PROP_ONLINE,
322 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
323 	POWER_SUPPLY_PROP_VOLTAGE_AVG,
324 	POWER_SUPPLY_PROP_CURRENT_NOW,
325 };
326 
327 /* USB properties */
328 static enum power_supply_property ab8500_charger_usb_props[] = {
329 	POWER_SUPPLY_PROP_HEALTH,
330 	POWER_SUPPLY_PROP_CURRENT_AVG,
331 	POWER_SUPPLY_PROP_PRESENT,
332 	POWER_SUPPLY_PROP_ONLINE,
333 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
334 	POWER_SUPPLY_PROP_VOLTAGE_AVG,
335 	POWER_SUPPLY_PROP_CURRENT_NOW,
336 };
337 
338 /*
339  * Function for enabling and disabling sw fallback mode
340  * should always be disabled when no charger is connected.
341  */
342 static void ab8500_enable_disable_sw_fallback(struct ab8500_charger *di,
343 		bool fallback)
344 {
345 	u8 val;
346 	u8 reg;
347 	u8 bank;
348 	u8 bit;
349 	int ret;
350 
351 	dev_dbg(di->dev, "SW Fallback: %d\n", fallback);
352 
353 	if (is_ab8500(di->parent)) {
354 		bank = 0x15;
355 		reg = 0x0;
356 		bit = 3;
357 	} else {
358 		bank = AB8500_SYS_CTRL1_BLOCK;
359 		reg = AB8500_SW_CONTROL_FALLBACK;
360 		bit = 0;
361 	}
362 
363 	/* read the register containing fallback bit */
364 	ret = abx500_get_register_interruptible(di->dev, bank, reg, &val);
365 	if (ret < 0) {
366 		dev_err(di->dev, "%d read failed\n", __LINE__);
367 		return;
368 	}
369 
370 	if (is_ab8500(di->parent)) {
371 		/* enable the OPT emulation registers */
372 		ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x2);
373 		if (ret) {
374 			dev_err(di->dev, "%d write failed\n", __LINE__);
375 			goto disable_otp;
376 		}
377 	}
378 
379 	if (fallback)
380 		val |= (1 << bit);
381 	else
382 		val &= ~(1 << bit);
383 
384 	/* write back the changed fallback bit value to register */
385 	ret = abx500_set_register_interruptible(di->dev, bank, reg, val);
386 	if (ret) {
387 		dev_err(di->dev, "%d write failed\n", __LINE__);
388 	}
389 
390 disable_otp:
391 	if (is_ab8500(di->parent)) {
392 		/* disable the set OTP registers again */
393 		ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x0);
394 		if (ret) {
395 			dev_err(di->dev, "%d write failed\n", __LINE__);
396 		}
397 	}
398 }
399 
400 /**
401  * ab8500_power_supply_changed - a wrapper with local extentions for
402  * power_supply_changed
403  * @di:	  pointer to the ab8500_charger structure
404  * @psy:  pointer to power_supply_that have changed.
405  *
406  */
407 static void ab8500_power_supply_changed(struct ab8500_charger *di,
408 					struct power_supply *psy)
409 {
410 	if (di->autopower_cfg) {
411 		if (!di->usb.charger_connected &&
412 		    !di->ac.charger_connected &&
413 		    di->autopower) {
414 			di->autopower = false;
415 			ab8500_enable_disable_sw_fallback(di, false);
416 		} else if (!di->autopower &&
417 			   (di->ac.charger_connected ||
418 			    di->usb.charger_connected)) {
419 			di->autopower = true;
420 			ab8500_enable_disable_sw_fallback(di, true);
421 		}
422 	}
423 	power_supply_changed(psy);
424 }
425 
426 static void ab8500_charger_set_usb_connected(struct ab8500_charger *di,
427 	bool connected)
428 {
429 	if (connected != di->usb.charger_connected) {
430 		dev_dbg(di->dev, "USB connected:%i\n", connected);
431 		di->usb.charger_connected = connected;
432 
433 		if (!connected)
434 			di->flags.vbus_drop_end = false;
435 
436 		sysfs_notify(&di->usb_chg.psy->dev.kobj, NULL, "present");
437 
438 		if (connected) {
439 			mutex_lock(&di->charger_attached_mutex);
440 			mutex_unlock(&di->charger_attached_mutex);
441 
442 			if (is_ab8500(di->parent))
443 				queue_delayed_work(di->charger_wq,
444 					   &di->usb_charger_attached_work,
445 					   HZ);
446 		} else {
447 			cancel_delayed_work_sync(&di->usb_charger_attached_work);
448 			mutex_lock(&di->charger_attached_mutex);
449 			mutex_unlock(&di->charger_attached_mutex);
450 		}
451 	}
452 }
453 
454 /**
455  * ab8500_charger_get_ac_voltage() - get ac charger voltage
456  * @di:		pointer to the ab8500_charger structure
457  *
458  * Returns ac charger voltage (on success)
459  */
460 static int ab8500_charger_get_ac_voltage(struct ab8500_charger *di)
461 {
462 	int vch;
463 
464 	/* Only measure voltage if the charger is connected */
465 	if (di->ac.charger_connected) {
466 		vch = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_V);
467 		if (vch < 0)
468 			dev_err(di->dev, "%s gpadc conv failed,\n", __func__);
469 	} else {
470 		vch = 0;
471 	}
472 	return vch;
473 }
474 
475 /**
476  * ab8500_charger_ac_cv() - check if the main charger is in CV mode
477  * @di:		pointer to the ab8500_charger structure
478  *
479  * Returns ac charger CV mode (on success) else error code
480  */
481 static int ab8500_charger_ac_cv(struct ab8500_charger *di)
482 {
483 	u8 val;
484 	int ret = 0;
485 
486 	/* Only check CV mode if the charger is online */
487 	if (di->ac.charger_online) {
488 		ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
489 			AB8500_CH_STATUS1_REG, &val);
490 		if (ret < 0) {
491 			dev_err(di->dev, "%s ab8500 read failed\n", __func__);
492 			return 0;
493 		}
494 
495 		if (val & MAIN_CH_CV_ON)
496 			ret = 1;
497 		else
498 			ret = 0;
499 	}
500 
501 	return ret;
502 }
503 
504 /**
505  * ab8500_charger_get_vbus_voltage() - get vbus voltage
506  * @di:		pointer to the ab8500_charger structure
507  *
508  * This function returns the vbus voltage.
509  * Returns vbus voltage (on success)
510  */
511 static int ab8500_charger_get_vbus_voltage(struct ab8500_charger *di)
512 {
513 	int vch;
514 
515 	/* Only measure voltage if the charger is connected */
516 	if (di->usb.charger_connected) {
517 		vch = ab8500_gpadc_convert(di->gpadc, VBUS_V);
518 		if (vch < 0)
519 			dev_err(di->dev, "%s gpadc conv failed\n", __func__);
520 	} else {
521 		vch = 0;
522 	}
523 	return vch;
524 }
525 
526 /**
527  * ab8500_charger_get_usb_current() - get usb charger current
528  * @di:		pointer to the ab8500_charger structure
529  *
530  * This function returns the usb charger current.
531  * Returns usb current (on success) and error code on failure
532  */
533 static int ab8500_charger_get_usb_current(struct ab8500_charger *di)
534 {
535 	int ich;
536 
537 	/* Only measure current if the charger is online */
538 	if (di->usb.charger_online) {
539 		ich = ab8500_gpadc_convert(di->gpadc, USB_CHARGER_C);
540 		if (ich < 0)
541 			dev_err(di->dev, "%s gpadc conv failed\n", __func__);
542 	} else {
543 		ich = 0;
544 	}
545 	return ich;
546 }
547 
548 /**
549  * ab8500_charger_get_ac_current() - get ac charger current
550  * @di:		pointer to the ab8500_charger structure
551  *
552  * This function returns the ac charger current.
553  * Returns ac current (on success) and error code on failure.
554  */
555 static int ab8500_charger_get_ac_current(struct ab8500_charger *di)
556 {
557 	int ich;
558 
559 	/* Only measure current if the charger is online */
560 	if (di->ac.charger_online) {
561 		ich = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_C);
562 		if (ich < 0)
563 			dev_err(di->dev, "%s gpadc conv failed\n", __func__);
564 	} else {
565 		ich = 0;
566 	}
567 	return ich;
568 }
569 
570 /**
571  * ab8500_charger_usb_cv() - check if the usb charger is in CV mode
572  * @di:		pointer to the ab8500_charger structure
573  *
574  * Returns ac charger CV mode (on success) else error code
575  */
576 static int ab8500_charger_usb_cv(struct ab8500_charger *di)
577 {
578 	int ret;
579 	u8 val;
580 
581 	/* Only check CV mode if the charger is online */
582 	if (di->usb.charger_online) {
583 		ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
584 			AB8500_CH_USBCH_STAT1_REG, &val);
585 		if (ret < 0) {
586 			dev_err(di->dev, "%s ab8500 read failed\n", __func__);
587 			return 0;
588 		}
589 
590 		if (val & USB_CH_CV_ON)
591 			ret = 1;
592 		else
593 			ret = 0;
594 	} else {
595 		ret = 0;
596 	}
597 
598 	return ret;
599 }
600 
601 /**
602  * ab8500_charger_detect_chargers() - Detect the connected chargers
603  * @di:		pointer to the ab8500_charger structure
604  * @probe:	if probe, don't delay and wait for HW
605  *
606  * Returns the type of charger connected.
607  * For USB it will not mean we can actually charge from it
608  * but that there is a USB cable connected that we have to
609  * identify. This is used during startup when we don't get
610  * interrupts of the charger detection
611  *
612  * Returns an integer value, that means,
613  * NO_PW_CONN  no power supply is connected
614  * AC_PW_CONN  if the AC power supply is connected
615  * USB_PW_CONN  if the USB power supply is connected
616  * AC_PW_CONN + USB_PW_CONN if USB and AC power supplies are both connected
617  */
618 static int ab8500_charger_detect_chargers(struct ab8500_charger *di, bool probe)
619 {
620 	int result = NO_PW_CONN;
621 	int ret;
622 	u8 val;
623 
624 	/* Check for AC charger */
625 	ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
626 		AB8500_CH_STATUS1_REG, &val);
627 	if (ret < 0) {
628 		dev_err(di->dev, "%s ab8500 read failed\n", __func__);
629 		return ret;
630 	}
631 
632 	if (val & MAIN_CH_DET)
633 		result = AC_PW_CONN;
634 
635 	/* Check for USB charger */
636 
637 	if (!probe) {
638 		/*
639 		 * AB8500 says VBUS_DET_DBNC1 & VBUS_DET_DBNC100
640 		 * when disconnecting ACA even though no
641 		 * charger was connected. Try waiting a little
642 		 * longer than the 100 ms of VBUS_DET_DBNC100...
643 		 */
644 		msleep(110);
645 	}
646 	ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
647 		AB8500_CH_USBCH_STAT1_REG, &val);
648 	if (ret < 0) {
649 		dev_err(di->dev, "%s ab8500 read failed\n", __func__);
650 		return ret;
651 	}
652 	dev_dbg(di->dev,
653 		"%s AB8500_CH_USBCH_STAT1_REG %x\n", __func__,
654 		val);
655 	if ((val & VBUS_DET_DBNC1) && (val & VBUS_DET_DBNC100))
656 		result |= USB_PW_CONN;
657 
658 	return result;
659 }
660 
661 /**
662  * ab8500_charger_max_usb_curr() - get the max curr for the USB type
663  * @di:			pointer to the ab8500_charger structure
664  * @link_status:	the identified USB type
665  *
666  * Get the maximum current that is allowed to be drawn from the host
667  * based on the USB type.
668  * Returns error code in case of failure else 0 on success
669  */
670 static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
671 		enum ab8500_charger_link_status link_status)
672 {
673 	int ret = 0;
674 
675 	di->usb_device_is_unrecognised = false;
676 
677 	/*
678 	 * Platform only supports USB 2.0.
679 	 * This means that charging current from USB source
680 	 * is maximum 500 mA. Every occurence of USB_STAT_*_HOST_*
681 	 * should set USB_CH_IP_CUR_LVL_0P5.
682 	 */
683 
684 	switch (link_status) {
685 	case USB_STAT_STD_HOST_NC:
686 	case USB_STAT_STD_HOST_C_NS:
687 	case USB_STAT_STD_HOST_C_S:
688 		dev_dbg(di->dev, "USB Type - Standard host is "
689 			"detected through USB driver\n");
690 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
691 		di->is_aca_rid = 0;
692 		break;
693 	case USB_STAT_HOST_CHG_HS_CHIRP:
694 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
695 		di->is_aca_rid = 0;
696 		break;
697 	case USB_STAT_HOST_CHG_HS:
698 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
699 		di->is_aca_rid = 0;
700 		break;
701 	case USB_STAT_ACA_RID_C_HS:
702 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P9;
703 		di->is_aca_rid = 0;
704 		break;
705 	case USB_STAT_ACA_RID_A:
706 		/*
707 		 * Dedicated charger level minus maximum current accessory
708 		 * can consume (900mA). Closest level is 500mA
709 		 */
710 		dev_dbg(di->dev, "USB_STAT_ACA_RID_A detected\n");
711 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
712 		di->is_aca_rid = 1;
713 		break;
714 	case USB_STAT_ACA_RID_B:
715 		/*
716 		 * Dedicated charger level minus 120mA (20mA for ACA and
717 		 * 100mA for potential accessory). Closest level is 1300mA
718 		 */
719 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P3;
720 		dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
721 				di->max_usb_in_curr.usb_type_max);
722 		di->is_aca_rid = 1;
723 		break;
724 	case USB_STAT_HOST_CHG_NM:
725 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
726 		di->is_aca_rid = 0;
727 		break;
728 	case USB_STAT_DEDICATED_CHG:
729 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P5;
730 		di->is_aca_rid = 0;
731 		break;
732 	case USB_STAT_ACA_RID_C_HS_CHIRP:
733 	case USB_STAT_ACA_RID_C_NM:
734 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P5;
735 		di->is_aca_rid = 1;
736 		break;
737 	case USB_STAT_NOT_CONFIGURED:
738 		if (di->vbus_detected) {
739 			di->usb_device_is_unrecognised = true;
740 			dev_dbg(di->dev, "USB Type - Legacy charger.\n");
741 			di->max_usb_in_curr.usb_type_max =
742 						USB_CH_IP_CUR_LVL_1P5;
743 			break;
744 		}
745 	case USB_STAT_HM_IDGND:
746 		dev_err(di->dev, "USB Type - Charging not allowed\n");
747 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
748 		ret = -ENXIO;
749 		break;
750 	case USB_STAT_RESERVED:
751 		if (is_ab8500(di->parent)) {
752 			di->flags.vbus_collapse = true;
753 			dev_err(di->dev, "USB Type - USB_STAT_RESERVED "
754 						"VBUS has collapsed\n");
755 			ret = -ENXIO;
756 			break;
757 		} else {
758 			dev_dbg(di->dev, "USB Type - Charging not allowed\n");
759 			di->max_usb_in_curr.usb_type_max =
760 						USB_CH_IP_CUR_LVL_0P05;
761 			dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
762 				link_status,
763 				di->max_usb_in_curr.usb_type_max);
764 			ret = -ENXIO;
765 			break;
766 		}
767 	case USB_STAT_CARKIT_1:
768 	case USB_STAT_CARKIT_2:
769 	case USB_STAT_ACA_DOCK_CHARGER:
770 	case USB_STAT_CHARGER_LINE_1:
771 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
772 		dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
773 				di->max_usb_in_curr.usb_type_max);
774 		break;
775 	case USB_STAT_NOT_VALID_LINK:
776 		dev_err(di->dev, "USB Type invalid - try charging anyway\n");
777 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
778 		break;
779 
780 	default:
781 		dev_err(di->dev, "USB Type - Unknown\n");
782 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
783 		ret = -ENXIO;
784 		break;
785 	};
786 
787 	di->max_usb_in_curr.set_max = di->max_usb_in_curr.usb_type_max;
788 	dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
789 		link_status, di->max_usb_in_curr.set_max);
790 
791 	return ret;
792 }
793 
794 /**
795  * ab8500_charger_read_usb_type() - read the type of usb connected
796  * @di:		pointer to the ab8500_charger structure
797  *
798  * Detect the type of the plugged USB
799  * Returns error code in case of failure else 0 on success
800  */
801 static int ab8500_charger_read_usb_type(struct ab8500_charger *di)
802 {
803 	int ret;
804 	u8 val;
805 
806 	ret = abx500_get_register_interruptible(di->dev,
807 		AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG, &val);
808 	if (ret < 0) {
809 		dev_err(di->dev, "%s ab8500 read failed\n", __func__);
810 		return ret;
811 	}
812 	if (is_ab8500(di->parent))
813 		ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
814 			AB8500_USB_LINE_STAT_REG, &val);
815 	else
816 		ret = abx500_get_register_interruptible(di->dev,
817 			AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
818 	if (ret < 0) {
819 		dev_err(di->dev, "%s ab8500 read failed\n", __func__);
820 		return ret;
821 	}
822 
823 	/* get the USB type */
824 	if (is_ab8500(di->parent))
825 		val = (val & AB8500_USB_LINK_STATUS) >> USB_LINK_STATUS_SHIFT;
826 	else
827 		val = (val & AB8505_USB_LINK_STATUS) >> USB_LINK_STATUS_SHIFT;
828 	ret = ab8500_charger_max_usb_curr(di,
829 		(enum ab8500_charger_link_status) val);
830 
831 	return ret;
832 }
833 
834 /**
835  * ab8500_charger_detect_usb_type() - get the type of usb connected
836  * @di:		pointer to the ab8500_charger structure
837  *
838  * Detect the type of the plugged USB
839  * Returns error code in case of failure else 0 on success
840  */
841 static int ab8500_charger_detect_usb_type(struct ab8500_charger *di)
842 {
843 	int i, ret;
844 	u8 val;
845 
846 	/*
847 	 * On getting the VBUS rising edge detect interrupt there
848 	 * is a 250ms delay after which the register UsbLineStatus
849 	 * is filled with valid data.
850 	 */
851 	for (i = 0; i < 10; i++) {
852 		msleep(250);
853 		ret = abx500_get_register_interruptible(di->dev,
854 			AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG,
855 			&val);
856 		dev_dbg(di->dev, "%s AB8500_IT_SOURCE21_REG %x\n",
857 			__func__, val);
858 		if (ret < 0) {
859 			dev_err(di->dev, "%s ab8500 read failed\n", __func__);
860 			return ret;
861 		}
862 
863 		if (is_ab8500(di->parent))
864 			ret = abx500_get_register_interruptible(di->dev,
865 				AB8500_USB, AB8500_USB_LINE_STAT_REG, &val);
866 		else
867 			ret = abx500_get_register_interruptible(di->dev,
868 				AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
869 		if (ret < 0) {
870 			dev_err(di->dev, "%s ab8500 read failed\n", __func__);
871 			return ret;
872 		}
873 		dev_dbg(di->dev, "%s AB8500_USB_LINE_STAT_REG %x\n", __func__,
874 			val);
875 		/*
876 		 * Until the IT source register is read the UsbLineStatus
877 		 * register is not updated, hence doing the same
878 		 * Revisit this:
879 		 */
880 
881 		/* get the USB type */
882 		if (is_ab8500(di->parent))
883 			val = (val & AB8500_USB_LINK_STATUS) >>
884 							USB_LINK_STATUS_SHIFT;
885 		else
886 			val = (val & AB8505_USB_LINK_STATUS) >>
887 							USB_LINK_STATUS_SHIFT;
888 		if (val)
889 			break;
890 	}
891 	ret = ab8500_charger_max_usb_curr(di,
892 		(enum ab8500_charger_link_status) val);
893 
894 	return ret;
895 }
896 
897 /*
898  * This array maps the raw hex value to charger voltage used by the AB8500
899  * Values taken from the UM0836
900  */
901 static int ab8500_charger_voltage_map[] = {
902 	3500 ,
903 	3525 ,
904 	3550 ,
905 	3575 ,
906 	3600 ,
907 	3625 ,
908 	3650 ,
909 	3675 ,
910 	3700 ,
911 	3725 ,
912 	3750 ,
913 	3775 ,
914 	3800 ,
915 	3825 ,
916 	3850 ,
917 	3875 ,
918 	3900 ,
919 	3925 ,
920 	3950 ,
921 	3975 ,
922 	4000 ,
923 	4025 ,
924 	4050 ,
925 	4060 ,
926 	4070 ,
927 	4080 ,
928 	4090 ,
929 	4100 ,
930 	4110 ,
931 	4120 ,
932 	4130 ,
933 	4140 ,
934 	4150 ,
935 	4160 ,
936 	4170 ,
937 	4180 ,
938 	4190 ,
939 	4200 ,
940 	4210 ,
941 	4220 ,
942 	4230 ,
943 	4240 ,
944 	4250 ,
945 	4260 ,
946 	4270 ,
947 	4280 ,
948 	4290 ,
949 	4300 ,
950 	4310 ,
951 	4320 ,
952 	4330 ,
953 	4340 ,
954 	4350 ,
955 	4360 ,
956 	4370 ,
957 	4380 ,
958 	4390 ,
959 	4400 ,
960 	4410 ,
961 	4420 ,
962 	4430 ,
963 	4440 ,
964 	4450 ,
965 	4460 ,
966 	4470 ,
967 	4480 ,
968 	4490 ,
969 	4500 ,
970 	4510 ,
971 	4520 ,
972 	4530 ,
973 	4540 ,
974 	4550 ,
975 	4560 ,
976 	4570 ,
977 	4580 ,
978 	4590 ,
979 	4600 ,
980 };
981 
982 static int ab8500_voltage_to_regval(int voltage)
983 {
984 	int i;
985 
986 	/* Special case for voltage below 3.5V */
987 	if (voltage < ab8500_charger_voltage_map[0])
988 		return LOW_VOLT_REG;
989 
990 	for (i = 1; i < ARRAY_SIZE(ab8500_charger_voltage_map); i++) {
991 		if (voltage < ab8500_charger_voltage_map[i])
992 			return i - 1;
993 	}
994 
995 	/* If not last element, return error */
996 	i = ARRAY_SIZE(ab8500_charger_voltage_map) - 1;
997 	if (voltage == ab8500_charger_voltage_map[i])
998 		return i;
999 	else
1000 		return -1;
1001 }
1002 
1003 static int ab8500_current_to_regval(struct ab8500_charger *di, int curr)
1004 {
1005 	int i;
1006 
1007 	if (curr < di->bm->chg_output_curr[0])
1008 		return 0;
1009 
1010 	for (i = 0; i < di->bm->n_chg_out_curr; i++) {
1011 		if (curr < di->bm->chg_output_curr[i])
1012 			return i - 1;
1013 	}
1014 
1015 	/* If not last element, return error */
1016 	i = di->bm->n_chg_out_curr - 1;
1017 	if (curr == di->bm->chg_output_curr[i])
1018 		return i;
1019 	else
1020 		return -1;
1021 }
1022 
1023 static int ab8500_vbus_in_curr_to_regval(struct ab8500_charger *di, int curr)
1024 {
1025 	int i;
1026 
1027 	if (curr < di->bm->chg_input_curr[0])
1028 		return 0;
1029 
1030 	for (i = 0; i < di->bm->n_chg_in_curr; i++) {
1031 		if (curr < di->bm->chg_input_curr[i])
1032 			return i - 1;
1033 	}
1034 
1035 	/* If not last element, return error */
1036 	i = di->bm->n_chg_in_curr - 1;
1037 	if (curr == di->bm->chg_input_curr[i])
1038 		return i;
1039 	else
1040 		return -1;
1041 }
1042 
1043 /**
1044  * ab8500_charger_get_usb_cur() - get usb current
1045  * @di:		pointer to the ab8500_charger structre
1046  *
1047  * The usb stack provides the maximum current that can be drawn from
1048  * the standard usb host. This will be in mA.
1049  * This function converts current in mA to a value that can be written
1050  * to the register. Returns -1 if charging is not allowed
1051  */
1052 static int ab8500_charger_get_usb_cur(struct ab8500_charger *di)
1053 {
1054 	int ret = 0;
1055 	switch (di->usb_state.usb_current) {
1056 	case 100:
1057 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P09;
1058 		break;
1059 	case 200:
1060 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P19;
1061 		break;
1062 	case 300:
1063 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P29;
1064 		break;
1065 	case 400:
1066 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P38;
1067 		break;
1068 	case 500:
1069 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
1070 		break;
1071 	default:
1072 		di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
1073 		ret = -EPERM;
1074 		break;
1075 	};
1076 	di->max_usb_in_curr.set_max = di->max_usb_in_curr.usb_type_max;
1077 	return ret;
1078 }
1079 
1080 /**
1081  * ab8500_charger_check_continue_stepping() - Check to allow stepping
1082  * @di:		pointer to the ab8500_charger structure
1083  * @reg:	select what charger register to check
1084  *
1085  * Check if current stepping should be allowed to continue.
1086  * Checks if charger source has not collapsed. If it has, further stepping
1087  * is not allowed.
1088  */
1089 static bool ab8500_charger_check_continue_stepping(struct ab8500_charger *di,
1090 						   int reg)
1091 {
1092 	if (reg == AB8500_USBCH_IPT_CRNTLVL_REG)
1093 		return !di->flags.vbus_drop_end;
1094 	else
1095 		return true;
1096 }
1097 
1098 /**
1099  * ab8500_charger_set_current() - set charger current
1100  * @di:		pointer to the ab8500_charger structure
1101  * @ich:	charger current, in mA
1102  * @reg:	select what charger register to set
1103  *
1104  * Set charger current.
1105  * There is no state machine in the AB to step up/down the charger
1106  * current to avoid dips and spikes on MAIN, VBUS and VBAT when
1107  * charging is started. Instead we need to implement
1108  * this charger current step-up/down here.
1109  * Returns error code in case of failure else 0(on success)
1110  */
1111 static int ab8500_charger_set_current(struct ab8500_charger *di,
1112 	int ich, int reg)
1113 {
1114 	int ret = 0;
1115 	int curr_index, prev_curr_index, shift_value, i;
1116 	u8 reg_value;
1117 	u32 step_udelay;
1118 	bool no_stepping = false;
1119 
1120 	atomic_inc(&di->current_stepping_sessions);
1121 
1122 	ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1123 		reg, &reg_value);
1124 	if (ret < 0) {
1125 		dev_err(di->dev, "%s read failed\n", __func__);
1126 		goto exit_set_current;
1127 	}
1128 
1129 	switch (reg) {
1130 	case AB8500_MCH_IPT_CURLVL_REG:
1131 		shift_value = MAIN_CH_INPUT_CURR_SHIFT;
1132 		prev_curr_index = (reg_value >> shift_value);
1133 		curr_index = ab8500_current_to_regval(di, ich);
1134 		step_udelay = STEP_UDELAY;
1135 		if (!di->ac.charger_connected)
1136 			no_stepping = true;
1137 		break;
1138 	case AB8500_USBCH_IPT_CRNTLVL_REG:
1139 		shift_value = VBUS_IN_CURR_LIM_SHIFT;
1140 		prev_curr_index = (reg_value >> shift_value);
1141 		curr_index = ab8500_vbus_in_curr_to_regval(di, ich);
1142 		step_udelay = STEP_UDELAY * 100;
1143 
1144 		if (!di->usb.charger_connected)
1145 			no_stepping = true;
1146 		break;
1147 	case AB8500_CH_OPT_CRNTLVL_REG:
1148 		shift_value = 0;
1149 		prev_curr_index = (reg_value >> shift_value);
1150 		curr_index = ab8500_current_to_regval(di, ich);
1151 		step_udelay = STEP_UDELAY;
1152 		if (curr_index && (curr_index - prev_curr_index) > 1)
1153 			step_udelay *= 100;
1154 
1155 		if (!di->usb.charger_connected && !di->ac.charger_connected)
1156 			no_stepping = true;
1157 
1158 		break;
1159 	default:
1160 		dev_err(di->dev, "%s current register not valid\n", __func__);
1161 		ret = -ENXIO;
1162 		goto exit_set_current;
1163 	}
1164 
1165 	if (curr_index < 0) {
1166 		dev_err(di->dev, "requested current limit out-of-range\n");
1167 		ret = -ENXIO;
1168 		goto exit_set_current;
1169 	}
1170 
1171 	/* only update current if it's been changed */
1172 	if (prev_curr_index == curr_index) {
1173 		dev_dbg(di->dev, "%s current not changed for reg: 0x%02x\n",
1174 			__func__, reg);
1175 		ret = 0;
1176 		goto exit_set_current;
1177 	}
1178 
1179 	dev_dbg(di->dev, "%s set charger current: %d mA for reg: 0x%02x\n",
1180 		__func__, ich, reg);
1181 
1182 	if (no_stepping) {
1183 		ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1184 					reg, (u8)curr_index << shift_value);
1185 		if (ret)
1186 			dev_err(di->dev, "%s write failed\n", __func__);
1187 	} else if (prev_curr_index > curr_index) {
1188 		for (i = prev_curr_index - 1; i >= curr_index; i--) {
1189 			dev_dbg(di->dev, "curr change_1 to: %x for 0x%02x\n",
1190 				(u8) i << shift_value, reg);
1191 			ret = abx500_set_register_interruptible(di->dev,
1192 				AB8500_CHARGER, reg, (u8)i << shift_value);
1193 			if (ret) {
1194 				dev_err(di->dev, "%s write failed\n", __func__);
1195 				goto exit_set_current;
1196 			}
1197 			if (i != curr_index)
1198 				usleep_range(step_udelay, step_udelay * 2);
1199 		}
1200 	} else {
1201 		bool allow = true;
1202 		for (i = prev_curr_index + 1; i <= curr_index && allow; i++) {
1203 			dev_dbg(di->dev, "curr change_2 to: %x for 0x%02x\n",
1204 				(u8)i << shift_value, reg);
1205 			ret = abx500_set_register_interruptible(di->dev,
1206 				AB8500_CHARGER, reg, (u8)i << shift_value);
1207 			if (ret) {
1208 				dev_err(di->dev, "%s write failed\n", __func__);
1209 				goto exit_set_current;
1210 			}
1211 			if (i != curr_index)
1212 				usleep_range(step_udelay, step_udelay * 2);
1213 
1214 			allow = ab8500_charger_check_continue_stepping(di, reg);
1215 		}
1216 	}
1217 
1218 exit_set_current:
1219 	atomic_dec(&di->current_stepping_sessions);
1220 
1221 	return ret;
1222 }
1223 
1224 /**
1225  * ab8500_charger_set_vbus_in_curr() - set VBUS input current limit
1226  * @di:		pointer to the ab8500_charger structure
1227  * @ich_in:	charger input current limit
1228  *
1229  * Sets the current that can be drawn from the USB host
1230  * Returns error code in case of failure else 0(on success)
1231  */
1232 static int ab8500_charger_set_vbus_in_curr(struct ab8500_charger *di,
1233 		int ich_in)
1234 {
1235 	int min_value;
1236 	int ret;
1237 
1238 	/* We should always use to lowest current limit */
1239 	min_value = min(di->bm->chg_params->usb_curr_max, ich_in);
1240 	if (di->max_usb_in_curr.set_max > 0)
1241 		min_value = min(di->max_usb_in_curr.set_max, min_value);
1242 
1243 	if (di->usb_state.usb_current >= 0)
1244 		min_value = min(di->usb_state.usb_current, min_value);
1245 
1246 	switch (min_value) {
1247 	case 100:
1248 		if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1249 			min_value = USB_CH_IP_CUR_LVL_0P05;
1250 		break;
1251 	case 500:
1252 		if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1253 			min_value = USB_CH_IP_CUR_LVL_0P45;
1254 		break;
1255 	default:
1256 		break;
1257 	}
1258 
1259 	dev_info(di->dev, "VBUS input current limit set to %d mA\n", min_value);
1260 
1261 	mutex_lock(&di->usb_ipt_crnt_lock);
1262 	ret = ab8500_charger_set_current(di, min_value,
1263 		AB8500_USBCH_IPT_CRNTLVL_REG);
1264 	mutex_unlock(&di->usb_ipt_crnt_lock);
1265 
1266 	return ret;
1267 }
1268 
1269 /**
1270  * ab8500_charger_set_main_in_curr() - set main charger input current
1271  * @di:		pointer to the ab8500_charger structure
1272  * @ich_in:	input charger current, in mA
1273  *
1274  * Set main charger input current.
1275  * Returns error code in case of failure else 0(on success)
1276  */
1277 static int ab8500_charger_set_main_in_curr(struct ab8500_charger *di,
1278 	int ich_in)
1279 {
1280 	return ab8500_charger_set_current(di, ich_in,
1281 		AB8500_MCH_IPT_CURLVL_REG);
1282 }
1283 
1284 /**
1285  * ab8500_charger_set_output_curr() - set charger output current
1286  * @di:		pointer to the ab8500_charger structure
1287  * @ich_out:	output charger current, in mA
1288  *
1289  * Set charger output current.
1290  * Returns error code in case of failure else 0(on success)
1291  */
1292 static int ab8500_charger_set_output_curr(struct ab8500_charger *di,
1293 	int ich_out)
1294 {
1295 	return ab8500_charger_set_current(di, ich_out,
1296 		AB8500_CH_OPT_CRNTLVL_REG);
1297 }
1298 
1299 /**
1300  * ab8500_charger_led_en() - turn on/off chargign led
1301  * @di:		pointer to the ab8500_charger structure
1302  * @on:		flag to turn on/off the chargign led
1303  *
1304  * Power ON/OFF charging LED indication
1305  * Returns error code in case of failure else 0(on success)
1306  */
1307 static int ab8500_charger_led_en(struct ab8500_charger *di, int on)
1308 {
1309 	int ret;
1310 
1311 	if (on) {
1312 		/* Power ON charging LED indicator, set LED current to 5mA */
1313 		ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1314 			AB8500_LED_INDICATOR_PWM_CTRL,
1315 			(LED_IND_CUR_5MA | LED_INDICATOR_PWM_ENA));
1316 		if (ret) {
1317 			dev_err(di->dev, "Power ON LED failed\n");
1318 			return ret;
1319 		}
1320 		/* LED indicator PWM duty cycle 252/256 */
1321 		ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1322 			AB8500_LED_INDICATOR_PWM_DUTY,
1323 			LED_INDICATOR_PWM_DUTY_252_256);
1324 		if (ret) {
1325 			dev_err(di->dev, "Set LED PWM duty cycle failed\n");
1326 			return ret;
1327 		}
1328 	} else {
1329 		/* Power off charging LED indicator */
1330 		ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1331 			AB8500_LED_INDICATOR_PWM_CTRL,
1332 			LED_INDICATOR_PWM_DIS);
1333 		if (ret) {
1334 			dev_err(di->dev, "Power-off LED failed\n");
1335 			return ret;
1336 		}
1337 	}
1338 
1339 	return ret;
1340 }
1341 
1342 /**
1343  * ab8500_charger_ac_en() - enable or disable ac charging
1344  * @di:		pointer to the ab8500_charger structure
1345  * @enable:	enable/disable flag
1346  * @vset:	charging voltage
1347  * @iset:	charging current
1348  *
1349  * Enable/Disable AC/Mains charging and turns on/off the charging led
1350  * respectively.
1351  **/
1352 static int ab8500_charger_ac_en(struct ux500_charger *charger,
1353 	int enable, int vset, int iset)
1354 {
1355 	int ret;
1356 	int volt_index;
1357 	int curr_index;
1358 	int input_curr_index;
1359 	u8 overshoot = 0;
1360 
1361 	struct ab8500_charger *di = to_ab8500_charger_ac_device_info(charger);
1362 
1363 	if (enable) {
1364 		/* Check if AC is connected */
1365 		if (!di->ac.charger_connected) {
1366 			dev_err(di->dev, "AC charger not connected\n");
1367 			return -ENXIO;
1368 		}
1369 
1370 		/* Enable AC charging */
1371 		dev_dbg(di->dev, "Enable AC: %dmV %dmA\n", vset, iset);
1372 
1373 		/*
1374 		 * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1375 		 * will be triggered everytime we enable the VDD ADC supply.
1376 		 * This will turn off charging for a short while.
1377 		 * It can be avoided by having the supply on when
1378 		 * there is a charger enabled. Normally the VDD ADC supply
1379 		 * is enabled everytime a GPADC conversion is triggered. We will
1380 		 * force it to be enabled from this driver to have
1381 		 * the GPADC module independant of the AB8500 chargers
1382 		 */
1383 		if (!di->vddadc_en_ac) {
1384 			ret = regulator_enable(di->regu);
1385 			if (ret)
1386 				dev_warn(di->dev,
1387 					"Failed to enable regulator\n");
1388 			else
1389 				di->vddadc_en_ac = true;
1390 		}
1391 
1392 		/* Check if the requested voltage or current is valid */
1393 		volt_index = ab8500_voltage_to_regval(vset);
1394 		curr_index = ab8500_current_to_regval(di, iset);
1395 		input_curr_index = ab8500_current_to_regval(di,
1396 			di->bm->chg_params->ac_curr_max);
1397 		if (volt_index < 0 || curr_index < 0 || input_curr_index < 0) {
1398 			dev_err(di->dev,
1399 				"Charger voltage or current too high, "
1400 				"charging not started\n");
1401 			return -ENXIO;
1402 		}
1403 
1404 		/* ChVoltLevel: maximum battery charging voltage */
1405 		ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1406 			AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1407 		if (ret) {
1408 			dev_err(di->dev, "%s write failed\n", __func__);
1409 			return ret;
1410 		}
1411 		/* MainChInputCurr: current that can be drawn from the charger*/
1412 		ret = ab8500_charger_set_main_in_curr(di,
1413 			di->bm->chg_params->ac_curr_max);
1414 		if (ret) {
1415 			dev_err(di->dev, "%s Failed to set MainChInputCurr\n",
1416 				__func__);
1417 			return ret;
1418 		}
1419 		/* ChOutputCurentLevel: protected output current */
1420 		ret = ab8500_charger_set_output_curr(di, iset);
1421 		if (ret) {
1422 			dev_err(di->dev, "%s "
1423 				"Failed to set ChOutputCurentLevel\n",
1424 				__func__);
1425 			return ret;
1426 		}
1427 
1428 		/* Check if VBAT overshoot control should be enabled */
1429 		if (!di->bm->enable_overshoot)
1430 			overshoot = MAIN_CH_NO_OVERSHOOT_ENA_N;
1431 
1432 		/* Enable Main Charger */
1433 		ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1434 			AB8500_MCH_CTRL1, MAIN_CH_ENA | overshoot);
1435 		if (ret) {
1436 			dev_err(di->dev, "%s write failed\n", __func__);
1437 			return ret;
1438 		}
1439 
1440 		/* Power on charging LED indication */
1441 		ret = ab8500_charger_led_en(di, true);
1442 		if (ret < 0)
1443 			dev_err(di->dev, "failed to enable LED\n");
1444 
1445 		di->ac.charger_online = 1;
1446 	} else {
1447 		/* Disable AC charging */
1448 		if (is_ab8500_1p1_or_earlier(di->parent)) {
1449 			/*
1450 			 * For ABB revision 1.0 and 1.1 there is a bug in the
1451 			 * watchdog logic. That means we have to continously
1452 			 * kick the charger watchdog even when no charger is
1453 			 * connected. This is only valid once the AC charger
1454 			 * has been enabled. This is a bug that is not handled
1455 			 * by the algorithm and the watchdog have to be kicked
1456 			 * by the charger driver when the AC charger
1457 			 * is disabled
1458 			 */
1459 			if (di->ac_conn) {
1460 				queue_delayed_work(di->charger_wq,
1461 					&di->kick_wd_work,
1462 					round_jiffies(WD_KICK_INTERVAL));
1463 			}
1464 
1465 			/*
1466 			 * We can't turn off charging completely
1467 			 * due to a bug in AB8500 cut1.
1468 			 * If we do, charging will not start again.
1469 			 * That is why we set the lowest voltage
1470 			 * and current possible
1471 			 */
1472 			ret = abx500_set_register_interruptible(di->dev,
1473 				AB8500_CHARGER,
1474 				AB8500_CH_VOLT_LVL_REG, CH_VOL_LVL_3P5);
1475 			if (ret) {
1476 				dev_err(di->dev,
1477 					"%s write failed\n", __func__);
1478 				return ret;
1479 			}
1480 
1481 			ret = ab8500_charger_set_output_curr(di, 0);
1482 			if (ret) {
1483 				dev_err(di->dev, "%s "
1484 					"Failed to set ChOutputCurentLevel\n",
1485 					__func__);
1486 				return ret;
1487 			}
1488 		} else {
1489 			ret = abx500_set_register_interruptible(di->dev,
1490 				AB8500_CHARGER,
1491 				AB8500_MCH_CTRL1, 0);
1492 			if (ret) {
1493 				dev_err(di->dev,
1494 					"%s write failed\n", __func__);
1495 				return ret;
1496 			}
1497 		}
1498 
1499 		ret = ab8500_charger_led_en(di, false);
1500 		if (ret < 0)
1501 			dev_err(di->dev, "failed to disable LED\n");
1502 
1503 		di->ac.charger_online = 0;
1504 		di->ac.wd_expired = false;
1505 
1506 		/* Disable regulator if enabled */
1507 		if (di->vddadc_en_ac) {
1508 			regulator_disable(di->regu);
1509 			di->vddadc_en_ac = false;
1510 		}
1511 
1512 		dev_dbg(di->dev, "%s Disabled AC charging\n", __func__);
1513 	}
1514 	ab8500_power_supply_changed(di, di->ac_chg.psy);
1515 
1516 	return ret;
1517 }
1518 
1519 /**
1520  * ab8500_charger_usb_en() - enable usb charging
1521  * @di:		pointer to the ab8500_charger structure
1522  * @enable:	enable/disable flag
1523  * @vset:	charging voltage
1524  * @ich_out:	charger output current
1525  *
1526  * Enable/Disable USB charging and turns on/off the charging led respectively.
1527  * Returns error code in case of failure else 0(on success)
1528  */
1529 static int ab8500_charger_usb_en(struct ux500_charger *charger,
1530 	int enable, int vset, int ich_out)
1531 {
1532 	int ret;
1533 	int volt_index;
1534 	int curr_index;
1535 	u8 overshoot = 0;
1536 
1537 	struct ab8500_charger *di = to_ab8500_charger_usb_device_info(charger);
1538 
1539 	if (enable) {
1540 		/* Check if USB is connected */
1541 		if (!di->usb.charger_connected) {
1542 			dev_err(di->dev, "USB charger not connected\n");
1543 			return -ENXIO;
1544 		}
1545 
1546 		/*
1547 		 * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1548 		 * will be triggered everytime we enable the VDD ADC supply.
1549 		 * This will turn off charging for a short while.
1550 		 * It can be avoided by having the supply on when
1551 		 * there is a charger enabled. Normally the VDD ADC supply
1552 		 * is enabled everytime a GPADC conversion is triggered. We will
1553 		 * force it to be enabled from this driver to have
1554 		 * the GPADC module independant of the AB8500 chargers
1555 		 */
1556 		if (!di->vddadc_en_usb) {
1557 			ret = regulator_enable(di->regu);
1558 			if (ret)
1559 				dev_warn(di->dev,
1560 					"Failed to enable regulator\n");
1561 			else
1562 				di->vddadc_en_usb = true;
1563 		}
1564 
1565 		/* Enable USB charging */
1566 		dev_dbg(di->dev, "Enable USB: %dmV %dmA\n", vset, ich_out);
1567 
1568 		/* Check if the requested voltage or current is valid */
1569 		volt_index = ab8500_voltage_to_regval(vset);
1570 		curr_index = ab8500_current_to_regval(di, ich_out);
1571 		if (volt_index < 0 || curr_index < 0) {
1572 			dev_err(di->dev,
1573 				"Charger voltage or current too high, "
1574 				"charging not started\n");
1575 			return -ENXIO;
1576 		}
1577 
1578 		/* ChVoltLevel: max voltage upto which battery can be charged */
1579 		ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1580 			AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1581 		if (ret) {
1582 			dev_err(di->dev, "%s write failed\n", __func__);
1583 			return ret;
1584 		}
1585 		/* Check if VBAT overshoot control should be enabled */
1586 		if (!di->bm->enable_overshoot)
1587 			overshoot = USB_CHG_NO_OVERSHOOT_ENA_N;
1588 
1589 		/* Enable USB Charger */
1590 		dev_dbg(di->dev,
1591 			"Enabling USB with write to AB8500_USBCH_CTRL1_REG\n");
1592 		ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1593 			AB8500_USBCH_CTRL1_REG, USB_CH_ENA | overshoot);
1594 		if (ret) {
1595 			dev_err(di->dev, "%s write failed\n", __func__);
1596 			return ret;
1597 		}
1598 
1599 		/* If success power on charging LED indication */
1600 		ret = ab8500_charger_led_en(di, true);
1601 		if (ret < 0)
1602 			dev_err(di->dev, "failed to enable LED\n");
1603 
1604 		di->usb.charger_online = 1;
1605 
1606 		/* USBChInputCurr: current that can be drawn from the usb */
1607 		ret = ab8500_charger_set_vbus_in_curr(di,
1608 					di->max_usb_in_curr.usb_type_max);
1609 		if (ret) {
1610 			dev_err(di->dev, "setting USBChInputCurr failed\n");
1611 			return ret;
1612 		}
1613 
1614 		/* ChOutputCurentLevel: protected output current */
1615 		ret = ab8500_charger_set_output_curr(di, ich_out);
1616 		if (ret) {
1617 			dev_err(di->dev, "%s "
1618 				"Failed to set ChOutputCurentLevel\n",
1619 				__func__);
1620 			return ret;
1621 		}
1622 
1623 		queue_delayed_work(di->charger_wq, &di->check_vbat_work, HZ);
1624 
1625 	} else {
1626 		/* Disable USB charging */
1627 		dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
1628 		ret = abx500_set_register_interruptible(di->dev,
1629 			AB8500_CHARGER,
1630 			AB8500_USBCH_CTRL1_REG, 0);
1631 		if (ret) {
1632 			dev_err(di->dev,
1633 				"%s write failed\n", __func__);
1634 			return ret;
1635 		}
1636 
1637 		ret = ab8500_charger_led_en(di, false);
1638 		if (ret < 0)
1639 			dev_err(di->dev, "failed to disable LED\n");
1640 		/* USBChInputCurr: current that can be drawn from the usb */
1641 		ret = ab8500_charger_set_vbus_in_curr(di, 0);
1642 		if (ret) {
1643 			dev_err(di->dev, "setting USBChInputCurr failed\n");
1644 			return ret;
1645 		}
1646 
1647 		/* ChOutputCurentLevel: protected output current */
1648 		ret = ab8500_charger_set_output_curr(di, 0);
1649 		if (ret) {
1650 			dev_err(di->dev, "%s "
1651 				"Failed to reset ChOutputCurentLevel\n",
1652 				__func__);
1653 			return ret;
1654 		}
1655 		di->usb.charger_online = 0;
1656 		di->usb.wd_expired = false;
1657 
1658 		/* Disable regulator if enabled */
1659 		if (di->vddadc_en_usb) {
1660 			regulator_disable(di->regu);
1661 			di->vddadc_en_usb = false;
1662 		}
1663 
1664 		dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
1665 
1666 		/* Cancel any pending Vbat check work */
1667 		cancel_delayed_work(&di->check_vbat_work);
1668 
1669 	}
1670 	ab8500_power_supply_changed(di, di->usb_chg.psy);
1671 
1672 	return ret;
1673 }
1674 
1675 static int ab8500_external_charger_prepare(struct notifier_block *charger_nb,
1676 				unsigned long event, void *data)
1677 {
1678 	int ret;
1679 	struct device *dev = data;
1680 	/*Toggle External charger control pin*/
1681 	ret = abx500_set_register_interruptible(dev, AB8500_SYS_CTRL1_BLOCK,
1682 				  AB8500_SYS_CHARGER_CONTROL_REG,
1683 				  EXTERNAL_CHARGER_DISABLE_REG_VAL);
1684 	if (ret < 0) {
1685 		dev_err(dev, "write reg failed %d\n", ret);
1686 		goto out;
1687 	}
1688 	ret = abx500_set_register_interruptible(dev, AB8500_SYS_CTRL1_BLOCK,
1689 				  AB8500_SYS_CHARGER_CONTROL_REG,
1690 				  EXTERNAL_CHARGER_ENABLE_REG_VAL);
1691 	if (ret < 0)
1692 		dev_err(dev, "Write reg failed %d\n", ret);
1693 
1694 out:
1695 	return ret;
1696 }
1697 
1698 /**
1699  * ab8500_charger_usb_check_enable() - enable usb charging
1700  * @charger:	pointer to the ux500_charger structure
1701  * @vset:	charging voltage
1702  * @iset:	charger output current
1703  *
1704  * Check if the VBUS charger has been disconnected and reconnected without
1705  * AB8500 rising an interrupt. Returns 0 on success.
1706  */
1707 static int ab8500_charger_usb_check_enable(struct ux500_charger *charger,
1708 	int vset, int iset)
1709 {
1710 	u8 usbch_ctrl1 = 0;
1711 	int ret = 0;
1712 
1713 	struct ab8500_charger *di = to_ab8500_charger_usb_device_info(charger);
1714 
1715 	if (!di->usb.charger_connected)
1716 		return ret;
1717 
1718 	ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1719 				AB8500_USBCH_CTRL1_REG, &usbch_ctrl1);
1720 	if (ret < 0) {
1721 		dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
1722 		return ret;
1723 	}
1724 	dev_dbg(di->dev, "USB charger ctrl: 0x%02x\n", usbch_ctrl1);
1725 
1726 	if (!(usbch_ctrl1 & USB_CH_ENA)) {
1727 		dev_info(di->dev, "Charging has been disabled abnormally and will be re-enabled\n");
1728 
1729 		ret = abx500_mask_and_set_register_interruptible(di->dev,
1730 					AB8500_CHARGER, AB8500_CHARGER_CTRL,
1731 					DROP_COUNT_RESET, DROP_COUNT_RESET);
1732 		if (ret < 0) {
1733 			dev_err(di->dev, "ab8500 write failed %d\n", __LINE__);
1734 			return ret;
1735 		}
1736 
1737 		ret = ab8500_charger_usb_en(&di->usb_chg, true, vset, iset);
1738 		if (ret < 0) {
1739 			dev_err(di->dev, "Failed to enable VBUS charger %d\n",
1740 					__LINE__);
1741 			return ret;
1742 		}
1743 	}
1744 	return ret;
1745 }
1746 
1747 /**
1748  * ab8500_charger_ac_check_enable() - enable usb charging
1749  * @charger:	pointer to the ux500_charger structure
1750  * @vset:	charging voltage
1751  * @iset:	charger output current
1752  *
1753  * Check if the AC charger has been disconnected and reconnected without
1754  * AB8500 rising an interrupt. Returns 0 on success.
1755  */
1756 static int ab8500_charger_ac_check_enable(struct ux500_charger *charger,
1757 	int vset, int iset)
1758 {
1759 	u8 mainch_ctrl1 = 0;
1760 	int ret = 0;
1761 
1762 	struct ab8500_charger *di = to_ab8500_charger_ac_device_info(charger);
1763 
1764 	if (!di->ac.charger_connected)
1765 		return ret;
1766 
1767 	ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1768 				AB8500_MCH_CTRL1, &mainch_ctrl1);
1769 	if (ret < 0) {
1770 		dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
1771 		return ret;
1772 	}
1773 	dev_dbg(di->dev, "AC charger ctrl: 0x%02x\n", mainch_ctrl1);
1774 
1775 	if (!(mainch_ctrl1 & MAIN_CH_ENA)) {
1776 		dev_info(di->dev, "Charging has been disabled abnormally and will be re-enabled\n");
1777 
1778 		ret = abx500_mask_and_set_register_interruptible(di->dev,
1779 					AB8500_CHARGER, AB8500_CHARGER_CTRL,
1780 					DROP_COUNT_RESET, DROP_COUNT_RESET);
1781 
1782 		if (ret < 0) {
1783 			dev_err(di->dev, "ab8500 write failed %d\n", __LINE__);
1784 			return ret;
1785 		}
1786 
1787 		ret = ab8500_charger_ac_en(&di->usb_chg, true, vset, iset);
1788 		if (ret < 0) {
1789 			dev_err(di->dev, "failed to enable AC charger %d\n",
1790 				__LINE__);
1791 			return ret;
1792 		}
1793 	}
1794 	return ret;
1795 }
1796 
1797 /**
1798  * ab8500_charger_watchdog_kick() - kick charger watchdog
1799  * @di:		pointer to the ab8500_charger structure
1800  *
1801  * Kick charger watchdog
1802  * Returns error code in case of failure else 0(on success)
1803  */
1804 static int ab8500_charger_watchdog_kick(struct ux500_charger *charger)
1805 {
1806 	int ret;
1807 	struct ab8500_charger *di;
1808 
1809 	if (charger->psy->desc->type == POWER_SUPPLY_TYPE_MAINS)
1810 		di = to_ab8500_charger_ac_device_info(charger);
1811 	else if (charger->psy->desc->type == POWER_SUPPLY_TYPE_USB)
1812 		di = to_ab8500_charger_usb_device_info(charger);
1813 	else
1814 		return -ENXIO;
1815 
1816 	ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1817 		AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
1818 	if (ret)
1819 		dev_err(di->dev, "Failed to kick WD!\n");
1820 
1821 	return ret;
1822 }
1823 
1824 /**
1825  * ab8500_charger_update_charger_current() - update charger current
1826  * @di:		pointer to the ab8500_charger structure
1827  *
1828  * Update the charger output current for the specified charger
1829  * Returns error code in case of failure else 0(on success)
1830  */
1831 static int ab8500_charger_update_charger_current(struct ux500_charger *charger,
1832 		int ich_out)
1833 {
1834 	int ret;
1835 	struct ab8500_charger *di;
1836 
1837 	if (charger->psy->desc->type == POWER_SUPPLY_TYPE_MAINS)
1838 		di = to_ab8500_charger_ac_device_info(charger);
1839 	else if (charger->psy->desc->type == POWER_SUPPLY_TYPE_USB)
1840 		di = to_ab8500_charger_usb_device_info(charger);
1841 	else
1842 		return -ENXIO;
1843 
1844 	ret = ab8500_charger_set_output_curr(di, ich_out);
1845 	if (ret) {
1846 		dev_err(di->dev, "%s "
1847 			"Failed to set ChOutputCurentLevel\n",
1848 			__func__);
1849 		return ret;
1850 	}
1851 
1852 	/* Reset the main and usb drop input current measurement counter */
1853 	ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1854 				AB8500_CHARGER_CTRL, DROP_COUNT_RESET);
1855 	if (ret) {
1856 		dev_err(di->dev, "%s write failed\n", __func__);
1857 		return ret;
1858 	}
1859 
1860 	return ret;
1861 }
1862 
1863 static int ab8500_charger_get_ext_psy_data(struct device *dev, void *data)
1864 {
1865 	struct power_supply *psy;
1866 	struct power_supply *ext = dev_get_drvdata(dev);
1867 	const char **supplicants = (const char **)ext->supplied_to;
1868 	struct ab8500_charger *di;
1869 	union power_supply_propval ret;
1870 	int j;
1871 	struct ux500_charger *usb_chg;
1872 
1873 	usb_chg = (struct ux500_charger *)data;
1874 	psy = usb_chg->psy;
1875 
1876 	di = to_ab8500_charger_usb_device_info(usb_chg);
1877 
1878 	/* For all psy where the driver name appears in any supplied_to */
1879 	j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
1880 	if (j < 0)
1881 		return 0;
1882 
1883 	/* Go through all properties for the psy */
1884 	for (j = 0; j < ext->desc->num_properties; j++) {
1885 		enum power_supply_property prop;
1886 		prop = ext->desc->properties[j];
1887 
1888 		if (power_supply_get_property(ext, prop, &ret))
1889 			continue;
1890 
1891 		switch (prop) {
1892 		case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1893 			switch (ext->desc->type) {
1894 			case POWER_SUPPLY_TYPE_BATTERY:
1895 				di->vbat = ret.intval / 1000;
1896 				break;
1897 			default:
1898 				break;
1899 			}
1900 			break;
1901 		default:
1902 			break;
1903 		}
1904 	}
1905 	return 0;
1906 }
1907 
1908 /**
1909  * ab8500_charger_check_vbat_work() - keep vbus current within spec
1910  * @work	pointer to the work_struct structure
1911  *
1912  * Due to a asic bug it is necessary to lower the input current to the vbus
1913  * charger when charging with at some specific levels. This issue is only valid
1914  * for below a certain battery voltage. This function makes sure that the
1915  * the allowed current limit isn't exceeded.
1916  */
1917 static void ab8500_charger_check_vbat_work(struct work_struct *work)
1918 {
1919 	int t = 10;
1920 	struct ab8500_charger *di = container_of(work,
1921 		struct ab8500_charger, check_vbat_work.work);
1922 
1923 	class_for_each_device(power_supply_class, NULL,
1924 		di->usb_chg.psy, ab8500_charger_get_ext_psy_data);
1925 
1926 	/* First run old_vbat is 0. */
1927 	if (di->old_vbat == 0)
1928 		di->old_vbat = di->vbat;
1929 
1930 	if (!((di->old_vbat <= VBAT_TRESH_IP_CUR_RED &&
1931 		di->vbat <= VBAT_TRESH_IP_CUR_RED) ||
1932 		(di->old_vbat > VBAT_TRESH_IP_CUR_RED &&
1933 		di->vbat > VBAT_TRESH_IP_CUR_RED))) {
1934 
1935 		dev_dbg(di->dev, "Vbat did cross threshold, curr: %d, new: %d,"
1936 			" old: %d\n", di->max_usb_in_curr.usb_type_max,
1937 			di->vbat, di->old_vbat);
1938 		ab8500_charger_set_vbus_in_curr(di,
1939 					di->max_usb_in_curr.usb_type_max);
1940 		power_supply_changed(di->usb_chg.psy);
1941 	}
1942 
1943 	di->old_vbat = di->vbat;
1944 
1945 	/*
1946 	 * No need to check the battery voltage every second when not close to
1947 	 * the threshold.
1948 	 */
1949 	if (di->vbat < (VBAT_TRESH_IP_CUR_RED + 100) &&
1950 		(di->vbat > (VBAT_TRESH_IP_CUR_RED - 100)))
1951 			t = 1;
1952 
1953 	queue_delayed_work(di->charger_wq, &di->check_vbat_work, t * HZ);
1954 }
1955 
1956 /**
1957  * ab8500_charger_check_hw_failure_work() - check main charger failure
1958  * @work:	pointer to the work_struct structure
1959  *
1960  * Work queue function for checking the main charger status
1961  */
1962 static void ab8500_charger_check_hw_failure_work(struct work_struct *work)
1963 {
1964 	int ret;
1965 	u8 reg_value;
1966 
1967 	struct ab8500_charger *di = container_of(work,
1968 		struct ab8500_charger, check_hw_failure_work.work);
1969 
1970 	/* Check if the status bits for HW failure is still active */
1971 	if (di->flags.mainextchnotok) {
1972 		ret = abx500_get_register_interruptible(di->dev,
1973 			AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
1974 		if (ret < 0) {
1975 			dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1976 			return;
1977 		}
1978 		if (!(reg_value & MAIN_CH_NOK)) {
1979 			di->flags.mainextchnotok = false;
1980 			ab8500_power_supply_changed(di, di->ac_chg.psy);
1981 		}
1982 	}
1983 	if (di->flags.vbus_ovv) {
1984 		ret = abx500_get_register_interruptible(di->dev,
1985 			AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG,
1986 			&reg_value);
1987 		if (ret < 0) {
1988 			dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1989 			return;
1990 		}
1991 		if (!(reg_value & VBUS_OVV_TH)) {
1992 			di->flags.vbus_ovv = false;
1993 			ab8500_power_supply_changed(di, di->usb_chg.psy);
1994 		}
1995 	}
1996 	/* If we still have a failure, schedule a new check */
1997 	if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
1998 		queue_delayed_work(di->charger_wq,
1999 			&di->check_hw_failure_work, round_jiffies(HZ));
2000 	}
2001 }
2002 
2003 /**
2004  * ab8500_charger_kick_watchdog_work() - kick the watchdog
2005  * @work:	pointer to the work_struct structure
2006  *
2007  * Work queue function for kicking the charger watchdog.
2008  *
2009  * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
2010  * logic. That means we have to continously kick the charger
2011  * watchdog even when no charger is connected. This is only
2012  * valid once the AC charger has been enabled. This is
2013  * a bug that is not handled by the algorithm and the
2014  * watchdog have to be kicked by the charger driver
2015  * when the AC charger is disabled
2016  */
2017 static void ab8500_charger_kick_watchdog_work(struct work_struct *work)
2018 {
2019 	int ret;
2020 
2021 	struct ab8500_charger *di = container_of(work,
2022 		struct ab8500_charger, kick_wd_work.work);
2023 
2024 	ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
2025 		AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
2026 	if (ret)
2027 		dev_err(di->dev, "Failed to kick WD!\n");
2028 
2029 	/* Schedule a new watchdog kick */
2030 	queue_delayed_work(di->charger_wq,
2031 		&di->kick_wd_work, round_jiffies(WD_KICK_INTERVAL));
2032 }
2033 
2034 /**
2035  * ab8500_charger_ac_work() - work to get and set main charger status
2036  * @work:	pointer to the work_struct structure
2037  *
2038  * Work queue function for checking the main charger status
2039  */
2040 static void ab8500_charger_ac_work(struct work_struct *work)
2041 {
2042 	int ret;
2043 
2044 	struct ab8500_charger *di = container_of(work,
2045 		struct ab8500_charger, ac_work);
2046 
2047 	/*
2048 	 * Since we can't be sure that the events are received
2049 	 * synchronously, we have the check if the main charger is
2050 	 * connected by reading the status register
2051 	 */
2052 	ret = ab8500_charger_detect_chargers(di, false);
2053 	if (ret < 0)
2054 		return;
2055 
2056 	if (ret & AC_PW_CONN) {
2057 		di->ac.charger_connected = 1;
2058 		di->ac_conn = true;
2059 	} else {
2060 		di->ac.charger_connected = 0;
2061 	}
2062 
2063 	ab8500_power_supply_changed(di, di->ac_chg.psy);
2064 	sysfs_notify(&di->ac_chg.psy->dev.kobj, NULL, "present");
2065 }
2066 
2067 static void ab8500_charger_usb_attached_work(struct work_struct *work)
2068 {
2069 	struct ab8500_charger *di = container_of(work,
2070 						 struct ab8500_charger,
2071 						 usb_charger_attached_work.work);
2072 	int usbch = (USB_CH_VBUSDROP | USB_CH_VBUSDETDBNC);
2073 	int ret, i;
2074 	u8 statval;
2075 
2076 	for (i = 0; i < 10; i++) {
2077 		ret = abx500_get_register_interruptible(di->dev,
2078 							AB8500_CHARGER,
2079 							AB8500_CH_USBCH_STAT1_REG,
2080 							&statval);
2081 		if (ret < 0) {
2082 			dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
2083 			goto reschedule;
2084 		}
2085 		if ((statval & usbch) != usbch)
2086 			goto reschedule;
2087 
2088 		msleep(CHARGER_STATUS_POLL);
2089 	}
2090 
2091 	ab8500_charger_usb_en(&di->usb_chg, 0, 0, 0);
2092 
2093 	mutex_lock(&di->charger_attached_mutex);
2094 	mutex_unlock(&di->charger_attached_mutex);
2095 
2096 	return;
2097 
2098 reschedule:
2099 	queue_delayed_work(di->charger_wq,
2100 			   &di->usb_charger_attached_work,
2101 			   HZ);
2102 }
2103 
2104 static void ab8500_charger_ac_attached_work(struct work_struct *work)
2105 {
2106 
2107 	struct ab8500_charger *di = container_of(work,
2108 						 struct ab8500_charger,
2109 						 ac_charger_attached_work.work);
2110 	int mainch = (MAIN_CH_STATUS2_MAINCHGDROP |
2111 		      MAIN_CH_STATUS2_MAINCHARGERDETDBNC);
2112 	int ret, i;
2113 	u8 statval;
2114 
2115 	for (i = 0; i < 10; i++) {
2116 		ret = abx500_get_register_interruptible(di->dev,
2117 							AB8500_CHARGER,
2118 							AB8500_CH_STATUS2_REG,
2119 							&statval);
2120 		if (ret < 0) {
2121 			dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
2122 			goto reschedule;
2123 		}
2124 
2125 		if ((statval & mainch) != mainch)
2126 			goto reschedule;
2127 
2128 		msleep(CHARGER_STATUS_POLL);
2129 	}
2130 
2131 	ab8500_charger_ac_en(&di->ac_chg, 0, 0, 0);
2132 	queue_work(di->charger_wq, &di->ac_work);
2133 
2134 	mutex_lock(&di->charger_attached_mutex);
2135 	mutex_unlock(&di->charger_attached_mutex);
2136 
2137 	return;
2138 
2139 reschedule:
2140 	queue_delayed_work(di->charger_wq,
2141 			   &di->ac_charger_attached_work,
2142 			   HZ);
2143 }
2144 
2145 /**
2146  * ab8500_charger_detect_usb_type_work() - work to detect USB type
2147  * @work:	Pointer to the work_struct structure
2148  *
2149  * Detect the type of USB plugged
2150  */
2151 static void ab8500_charger_detect_usb_type_work(struct work_struct *work)
2152 {
2153 	int ret;
2154 
2155 	struct ab8500_charger *di = container_of(work,
2156 		struct ab8500_charger, detect_usb_type_work);
2157 
2158 	/*
2159 	 * Since we can't be sure that the events are received
2160 	 * synchronously, we have the check if is
2161 	 * connected by reading the status register
2162 	 */
2163 	ret = ab8500_charger_detect_chargers(di, false);
2164 	if (ret < 0)
2165 		return;
2166 
2167 	if (!(ret & USB_PW_CONN)) {
2168 		dev_dbg(di->dev, "%s di->vbus_detected = false\n", __func__);
2169 		di->vbus_detected = false;
2170 		ab8500_charger_set_usb_connected(di, false);
2171 		ab8500_power_supply_changed(di, di->usb_chg.psy);
2172 	} else {
2173 		dev_dbg(di->dev, "%s di->vbus_detected = true\n", __func__);
2174 		di->vbus_detected = true;
2175 
2176 		if (is_ab8500_1p1_or_earlier(di->parent)) {
2177 			ret = ab8500_charger_detect_usb_type(di);
2178 			if (!ret) {
2179 				ab8500_charger_set_usb_connected(di, true);
2180 				ab8500_power_supply_changed(di,
2181 							    di->usb_chg.psy);
2182 			}
2183 		} else {
2184 			/*
2185 			 * For ABB cut2.0 and onwards we have an IRQ,
2186 			 * USB_LINK_STATUS that will be triggered when the USB
2187 			 * link status changes. The exception is USB connected
2188 			 * during startup. Then we don't get a
2189 			 * USB_LINK_STATUS IRQ
2190 			 */
2191 			if (di->vbus_detected_start) {
2192 				di->vbus_detected_start = false;
2193 				ret = ab8500_charger_detect_usb_type(di);
2194 				if (!ret) {
2195 					ab8500_charger_set_usb_connected(di,
2196 						true);
2197 					ab8500_power_supply_changed(di,
2198 						di->usb_chg.psy);
2199 				}
2200 			}
2201 		}
2202 	}
2203 }
2204 
2205 /**
2206  * ab8500_charger_usb_link_attach_work() - work to detect USB type
2207  * @work:	pointer to the work_struct structure
2208  *
2209  * Detect the type of USB plugged
2210  */
2211 static void ab8500_charger_usb_link_attach_work(struct work_struct *work)
2212 {
2213 	struct ab8500_charger *di =
2214 		container_of(work, struct ab8500_charger, attach_work.work);
2215 	int ret;
2216 
2217 	/* Update maximum input current if USB enumeration is not detected */
2218 	if (!di->usb.charger_online) {
2219 		ret = ab8500_charger_set_vbus_in_curr(di,
2220 					di->max_usb_in_curr.usb_type_max);
2221 		if (ret)
2222 			return;
2223 	}
2224 
2225 	ab8500_charger_set_usb_connected(di, true);
2226 	ab8500_power_supply_changed(di, di->usb_chg.psy);
2227 }
2228 
2229 /**
2230  * ab8500_charger_usb_link_status_work() - work to detect USB type
2231  * @work:	pointer to the work_struct structure
2232  *
2233  * Detect the type of USB plugged
2234  */
2235 static void ab8500_charger_usb_link_status_work(struct work_struct *work)
2236 {
2237 	int detected_chargers;
2238 	int ret;
2239 	u8 val;
2240 	u8 link_status;
2241 
2242 	struct ab8500_charger *di = container_of(work,
2243 		struct ab8500_charger, usb_link_status_work);
2244 
2245 	/*
2246 	 * Since we can't be sure that the events are received
2247 	 * synchronously, we have the check if  is
2248 	 * connected by reading the status register
2249 	 */
2250 	detected_chargers = ab8500_charger_detect_chargers(di, false);
2251 	if (detected_chargers < 0)
2252 		return;
2253 
2254 	/*
2255 	 * Some chargers that breaks the USB spec is
2256 	 * identified as invalid by AB8500 and it refuse
2257 	 * to start the charging process. but by jumping
2258 	 * thru a few hoops it can be forced to start.
2259 	 */
2260 	if (is_ab8500(di->parent))
2261 		ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
2262 					AB8500_USB_LINE_STAT_REG, &val);
2263 	else
2264 		ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
2265 					AB8500_USB_LINK1_STAT_REG, &val);
2266 
2267 	if (ret >= 0)
2268 		dev_dbg(di->dev, "UsbLineStatus register = 0x%02x\n", val);
2269 	else
2270 		dev_dbg(di->dev, "Error reading USB link status\n");
2271 
2272 	if (is_ab8500(di->parent))
2273 		link_status = AB8500_USB_LINK_STATUS;
2274 	else
2275 		link_status = AB8505_USB_LINK_STATUS;
2276 
2277 	if (detected_chargers & USB_PW_CONN) {
2278 		if (((val & link_status) >> USB_LINK_STATUS_SHIFT) ==
2279 				USB_STAT_NOT_VALID_LINK &&
2280 				di->invalid_charger_detect_state == 0) {
2281 			dev_dbg(di->dev,
2282 					"Invalid charger detected, state= 0\n");
2283 			/*Enable charger*/
2284 			abx500_mask_and_set_register_interruptible(di->dev,
2285 					AB8500_CHARGER, AB8500_USBCH_CTRL1_REG,
2286 					USB_CH_ENA, USB_CH_ENA);
2287 			/*Enable charger detection*/
2288 			abx500_mask_and_set_register_interruptible(di->dev,
2289 					AB8500_USB, AB8500_USB_LINE_CTRL2_REG,
2290 					USB_CH_DET, USB_CH_DET);
2291 			di->invalid_charger_detect_state = 1;
2292 			/*exit and wait for new link status interrupt.*/
2293 			return;
2294 
2295 		}
2296 		if (di->invalid_charger_detect_state == 1) {
2297 			dev_dbg(di->dev,
2298 					"Invalid charger detected, state= 1\n");
2299 			/*Stop charger detection*/
2300 			abx500_mask_and_set_register_interruptible(di->dev,
2301 					AB8500_USB, AB8500_USB_LINE_CTRL2_REG,
2302 					USB_CH_DET, 0x00);
2303 			/*Check link status*/
2304 			if (is_ab8500(di->parent))
2305 				ret = abx500_get_register_interruptible(di->dev,
2306 					AB8500_USB, AB8500_USB_LINE_STAT_REG,
2307 					&val);
2308 			else
2309 				ret = abx500_get_register_interruptible(di->dev,
2310 					AB8500_USB, AB8500_USB_LINK1_STAT_REG,
2311 					&val);
2312 
2313 			dev_dbg(di->dev, "USB link status= 0x%02x\n",
2314 				(val & link_status) >> USB_LINK_STATUS_SHIFT);
2315 			di->invalid_charger_detect_state = 2;
2316 		}
2317 	} else {
2318 		di->invalid_charger_detect_state = 0;
2319 	}
2320 
2321 	if (!(detected_chargers & USB_PW_CONN)) {
2322 		di->vbus_detected = false;
2323 		ab8500_charger_set_usb_connected(di, false);
2324 		ab8500_power_supply_changed(di, di->usb_chg.psy);
2325 		return;
2326 	}
2327 
2328 	dev_dbg(di->dev,"%s di->vbus_detected = true\n",__func__);
2329 	di->vbus_detected = true;
2330 	ret = ab8500_charger_read_usb_type(di);
2331 	if (ret) {
2332 		if (ret == -ENXIO) {
2333 			/* No valid charger type detected */
2334 			ab8500_charger_set_usb_connected(di, false);
2335 			ab8500_power_supply_changed(di, di->usb_chg.psy);
2336 		}
2337 		return;
2338 	}
2339 
2340 	if (di->usb_device_is_unrecognised) {
2341 		dev_dbg(di->dev,
2342 			"Potential Legacy Charger device. "
2343 			"Delay work for %d msec for USB enum "
2344 			"to finish",
2345 			WAIT_ACA_RID_ENUMERATION);
2346 		queue_delayed_work(di->charger_wq,
2347 				   &di->attach_work,
2348 				   msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
2349 	} else if (di->is_aca_rid == 1) {
2350 		/* Only wait once */
2351 		di->is_aca_rid++;
2352 		dev_dbg(di->dev,
2353 			"%s Wait %d msec for USB enum to finish",
2354 			__func__, WAIT_ACA_RID_ENUMERATION);
2355 		queue_delayed_work(di->charger_wq,
2356 				   &di->attach_work,
2357 				   msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
2358 	} else {
2359 		queue_delayed_work(di->charger_wq,
2360 				   &di->attach_work,
2361 				   0);
2362 	}
2363 }
2364 
2365 static void ab8500_charger_usb_state_changed_work(struct work_struct *work)
2366 {
2367 	int ret;
2368 	unsigned long flags;
2369 
2370 	struct ab8500_charger *di = container_of(work,
2371 		struct ab8500_charger, usb_state_changed_work.work);
2372 
2373 	if (!di->vbus_detected)	{
2374 		dev_dbg(di->dev,
2375 			"%s !di->vbus_detected\n",
2376 			__func__);
2377 		return;
2378 	}
2379 
2380 	spin_lock_irqsave(&di->usb_state.usb_lock, flags);
2381 	di->usb_state.state = di->usb_state.state_tmp;
2382 	di->usb_state.usb_current = di->usb_state.usb_current_tmp;
2383 	spin_unlock_irqrestore(&di->usb_state.usb_lock, flags);
2384 
2385 	dev_dbg(di->dev, "%s USB state: 0x%02x mA: %d\n",
2386 		__func__, di->usb_state.state, di->usb_state.usb_current);
2387 
2388 	switch (di->usb_state.state) {
2389 	case AB8500_BM_USB_STATE_RESET_HS:
2390 	case AB8500_BM_USB_STATE_RESET_FS:
2391 	case AB8500_BM_USB_STATE_SUSPEND:
2392 	case AB8500_BM_USB_STATE_MAX:
2393 		ab8500_charger_set_usb_connected(di, false);
2394 		ab8500_power_supply_changed(di, di->usb_chg.psy);
2395 		break;
2396 
2397 	case AB8500_BM_USB_STATE_RESUME:
2398 		/*
2399 		 * when suspend->resume there should be delay
2400 		 * of 1sec for enabling charging
2401 		 */
2402 		msleep(1000);
2403 		/* Intentional fall through */
2404 	case AB8500_BM_USB_STATE_CONFIGURED:
2405 		/*
2406 		 * USB is configured, enable charging with the charging
2407 		 * input current obtained from USB driver
2408 		 */
2409 		if (!ab8500_charger_get_usb_cur(di)) {
2410 			/* Update maximum input current */
2411 			ret = ab8500_charger_set_vbus_in_curr(di,
2412 					di->max_usb_in_curr.usb_type_max);
2413 			if (ret)
2414 				return;
2415 
2416 			ab8500_charger_set_usb_connected(di, true);
2417 			ab8500_power_supply_changed(di, di->usb_chg.psy);
2418 		}
2419 		break;
2420 
2421 	default:
2422 		break;
2423 	};
2424 }
2425 
2426 /**
2427  * ab8500_charger_check_usbchargernotok_work() - check USB chg not ok status
2428  * @work:	pointer to the work_struct structure
2429  *
2430  * Work queue function for checking the USB charger Not OK status
2431  */
2432 static void ab8500_charger_check_usbchargernotok_work(struct work_struct *work)
2433 {
2434 	int ret;
2435 	u8 reg_value;
2436 	bool prev_status;
2437 
2438 	struct ab8500_charger *di = container_of(work,
2439 		struct ab8500_charger, check_usbchgnotok_work.work);
2440 
2441 	/* Check if the status bit for usbchargernotok is still active */
2442 	ret = abx500_get_register_interruptible(di->dev,
2443 		AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
2444 	if (ret < 0) {
2445 		dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2446 		return;
2447 	}
2448 	prev_status = di->flags.usbchargernotok;
2449 
2450 	if (reg_value & VBUS_CH_NOK) {
2451 		di->flags.usbchargernotok = true;
2452 		/* Check again in 1sec */
2453 		queue_delayed_work(di->charger_wq,
2454 			&di->check_usbchgnotok_work, HZ);
2455 	} else {
2456 		di->flags.usbchargernotok = false;
2457 		di->flags.vbus_collapse = false;
2458 	}
2459 
2460 	if (prev_status != di->flags.usbchargernotok)
2461 		ab8500_power_supply_changed(di, di->usb_chg.psy);
2462 }
2463 
2464 /**
2465  * ab8500_charger_check_main_thermal_prot_work() - check main thermal status
2466  * @work:	pointer to the work_struct structure
2467  *
2468  * Work queue function for checking the Main thermal prot status
2469  */
2470 static void ab8500_charger_check_main_thermal_prot_work(
2471 	struct work_struct *work)
2472 {
2473 	int ret;
2474 	u8 reg_value;
2475 
2476 	struct ab8500_charger *di = container_of(work,
2477 		struct ab8500_charger, check_main_thermal_prot_work);
2478 
2479 	/* Check if the status bit for main_thermal_prot is still active */
2480 	ret = abx500_get_register_interruptible(di->dev,
2481 		AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
2482 	if (ret < 0) {
2483 		dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2484 		return;
2485 	}
2486 	if (reg_value & MAIN_CH_TH_PROT)
2487 		di->flags.main_thermal_prot = true;
2488 	else
2489 		di->flags.main_thermal_prot = false;
2490 
2491 	ab8500_power_supply_changed(di, di->ac_chg.psy);
2492 }
2493 
2494 /**
2495  * ab8500_charger_check_usb_thermal_prot_work() - check usb thermal status
2496  * @work:	pointer to the work_struct structure
2497  *
2498  * Work queue function for checking the USB thermal prot status
2499  */
2500 static void ab8500_charger_check_usb_thermal_prot_work(
2501 	struct work_struct *work)
2502 {
2503 	int ret;
2504 	u8 reg_value;
2505 
2506 	struct ab8500_charger *di = container_of(work,
2507 		struct ab8500_charger, check_usb_thermal_prot_work);
2508 
2509 	/* Check if the status bit for usb_thermal_prot is still active */
2510 	ret = abx500_get_register_interruptible(di->dev,
2511 		AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
2512 	if (ret < 0) {
2513 		dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2514 		return;
2515 	}
2516 	if (reg_value & USB_CH_TH_PROT)
2517 		di->flags.usb_thermal_prot = true;
2518 	else
2519 		di->flags.usb_thermal_prot = false;
2520 
2521 	ab8500_power_supply_changed(di, di->usb_chg.psy);
2522 }
2523 
2524 /**
2525  * ab8500_charger_mainchunplugdet_handler() - main charger unplugged
2526  * @irq:       interrupt number
2527  * @_di:       pointer to the ab8500_charger structure
2528  *
2529  * Returns IRQ status(IRQ_HANDLED)
2530  */
2531 static irqreturn_t ab8500_charger_mainchunplugdet_handler(int irq, void *_di)
2532 {
2533 	struct ab8500_charger *di = _di;
2534 
2535 	dev_dbg(di->dev, "Main charger unplugged\n");
2536 	queue_work(di->charger_wq, &di->ac_work);
2537 
2538 	cancel_delayed_work_sync(&di->ac_charger_attached_work);
2539 	mutex_lock(&di->charger_attached_mutex);
2540 	mutex_unlock(&di->charger_attached_mutex);
2541 
2542 	return IRQ_HANDLED;
2543 }
2544 
2545 /**
2546  * ab8500_charger_mainchplugdet_handler() - main charger plugged
2547  * @irq:       interrupt number
2548  * @_di:       pointer to the ab8500_charger structure
2549  *
2550  * Returns IRQ status(IRQ_HANDLED)
2551  */
2552 static irqreturn_t ab8500_charger_mainchplugdet_handler(int irq, void *_di)
2553 {
2554 	struct ab8500_charger *di = _di;
2555 
2556 	dev_dbg(di->dev, "Main charger plugged\n");
2557 	queue_work(di->charger_wq, &di->ac_work);
2558 
2559 	mutex_lock(&di->charger_attached_mutex);
2560 	mutex_unlock(&di->charger_attached_mutex);
2561 
2562 	if (is_ab8500(di->parent))
2563 		queue_delayed_work(di->charger_wq,
2564 			   &di->ac_charger_attached_work,
2565 			   HZ);
2566 	return IRQ_HANDLED;
2567 }
2568 
2569 /**
2570  * ab8500_charger_mainextchnotok_handler() - main charger not ok
2571  * @irq:       interrupt number
2572  * @_di:       pointer to the ab8500_charger structure
2573  *
2574  * Returns IRQ status(IRQ_HANDLED)
2575  */
2576 static irqreturn_t ab8500_charger_mainextchnotok_handler(int irq, void *_di)
2577 {
2578 	struct ab8500_charger *di = _di;
2579 
2580 	dev_dbg(di->dev, "Main charger not ok\n");
2581 	di->flags.mainextchnotok = true;
2582 	ab8500_power_supply_changed(di, di->ac_chg.psy);
2583 
2584 	/* Schedule a new HW failure check */
2585 	queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2586 
2587 	return IRQ_HANDLED;
2588 }
2589 
2590 /**
2591  * ab8500_charger_mainchthprotr_handler() - Die temp is above main charger
2592  * thermal protection threshold
2593  * @irq:       interrupt number
2594  * @_di:       pointer to the ab8500_charger structure
2595  *
2596  * Returns IRQ status(IRQ_HANDLED)
2597  */
2598 static irqreturn_t ab8500_charger_mainchthprotr_handler(int irq, void *_di)
2599 {
2600 	struct ab8500_charger *di = _di;
2601 
2602 	dev_dbg(di->dev,
2603 		"Die temp above Main charger thermal protection threshold\n");
2604 	queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2605 
2606 	return IRQ_HANDLED;
2607 }
2608 
2609 /**
2610  * ab8500_charger_mainchthprotf_handler() - Die temp is below main charger
2611  * thermal protection threshold
2612  * @irq:       interrupt number
2613  * @_di:       pointer to the ab8500_charger structure
2614  *
2615  * Returns IRQ status(IRQ_HANDLED)
2616  */
2617 static irqreturn_t ab8500_charger_mainchthprotf_handler(int irq, void *_di)
2618 {
2619 	struct ab8500_charger *di = _di;
2620 
2621 	dev_dbg(di->dev,
2622 		"Die temp ok for Main charger thermal protection threshold\n");
2623 	queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2624 
2625 	return IRQ_HANDLED;
2626 }
2627 
2628 static void ab8500_charger_vbus_drop_end_work(struct work_struct *work)
2629 {
2630 	struct ab8500_charger *di = container_of(work,
2631 		struct ab8500_charger, vbus_drop_end_work.work);
2632 	int ret, curr;
2633 	u8 reg_value;
2634 
2635 	di->flags.vbus_drop_end = false;
2636 
2637 	/* Reset the drop counter */
2638 	abx500_set_register_interruptible(di->dev,
2639 				  AB8500_CHARGER, AB8500_CHARGER_CTRL, 0x01);
2640 
2641 	ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
2642 			AB8500_CH_USBCH_STAT2_REG, &reg_value);
2643 	if (ret < 0) {
2644 		dev_err(di->dev, "%s read failed\n", __func__);
2645 		return;
2646 	}
2647 
2648 	curr = di->bm->chg_input_curr[
2649 		reg_value >> AUTO_VBUS_IN_CURR_LIM_SHIFT];
2650 
2651 	if (di->max_usb_in_curr.calculated_max != curr) {
2652 		/* USB source is collapsing */
2653 		di->max_usb_in_curr.calculated_max = curr;
2654 		dev_dbg(di->dev,
2655 			 "VBUS input current limiting to %d mA\n",
2656 			 di->max_usb_in_curr.calculated_max);
2657 	} else {
2658 		/*
2659 		 * USB source can not give more than this amount.
2660 		 * Taking more will collapse the source.
2661 		 */
2662 		di->max_usb_in_curr.set_max =
2663 			di->max_usb_in_curr.calculated_max;
2664 		dev_dbg(di->dev,
2665 			 "VBUS input current limited to %d mA\n",
2666 			 di->max_usb_in_curr.set_max);
2667 	}
2668 
2669 	if (di->usb.charger_connected)
2670 		ab8500_charger_set_vbus_in_curr(di,
2671 					di->max_usb_in_curr.usb_type_max);
2672 }
2673 
2674 /**
2675  * ab8500_charger_vbusdetf_handler() - VBUS falling detected
2676  * @irq:       interrupt number
2677  * @_di:       pointer to the ab8500_charger structure
2678  *
2679  * Returns IRQ status(IRQ_HANDLED)
2680  */
2681 static irqreturn_t ab8500_charger_vbusdetf_handler(int irq, void *_di)
2682 {
2683 	struct ab8500_charger *di = _di;
2684 
2685 	di->vbus_detected = false;
2686 	dev_dbg(di->dev, "VBUS falling detected\n");
2687 	queue_work(di->charger_wq, &di->detect_usb_type_work);
2688 
2689 	return IRQ_HANDLED;
2690 }
2691 
2692 /**
2693  * ab8500_charger_vbusdetr_handler() - VBUS rising detected
2694  * @irq:       interrupt number
2695  * @_di:       pointer to the ab8500_charger structure
2696  *
2697  * Returns IRQ status(IRQ_HANDLED)
2698  */
2699 static irqreturn_t ab8500_charger_vbusdetr_handler(int irq, void *_di)
2700 {
2701 	struct ab8500_charger *di = _di;
2702 
2703 	di->vbus_detected = true;
2704 	dev_dbg(di->dev, "VBUS rising detected\n");
2705 
2706 	queue_work(di->charger_wq, &di->detect_usb_type_work);
2707 
2708 	return IRQ_HANDLED;
2709 }
2710 
2711 /**
2712  * ab8500_charger_usblinkstatus_handler() - USB link status has changed
2713  * @irq:       interrupt number
2714  * @_di:       pointer to the ab8500_charger structure
2715  *
2716  * Returns IRQ status(IRQ_HANDLED)
2717  */
2718 static irqreturn_t ab8500_charger_usblinkstatus_handler(int irq, void *_di)
2719 {
2720 	struct ab8500_charger *di = _di;
2721 
2722 	dev_dbg(di->dev, "USB link status changed\n");
2723 
2724 	queue_work(di->charger_wq, &di->usb_link_status_work);
2725 
2726 	return IRQ_HANDLED;
2727 }
2728 
2729 /**
2730  * ab8500_charger_usbchthprotr_handler() - Die temp is above usb charger
2731  * thermal protection threshold
2732  * @irq:       interrupt number
2733  * @_di:       pointer to the ab8500_charger structure
2734  *
2735  * Returns IRQ status(IRQ_HANDLED)
2736  */
2737 static irqreturn_t ab8500_charger_usbchthprotr_handler(int irq, void *_di)
2738 {
2739 	struct ab8500_charger *di = _di;
2740 
2741 	dev_dbg(di->dev,
2742 		"Die temp above USB charger thermal protection threshold\n");
2743 	queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2744 
2745 	return IRQ_HANDLED;
2746 }
2747 
2748 /**
2749  * ab8500_charger_usbchthprotf_handler() - Die temp is below usb charger
2750  * thermal protection threshold
2751  * @irq:       interrupt number
2752  * @_di:       pointer to the ab8500_charger structure
2753  *
2754  * Returns IRQ status(IRQ_HANDLED)
2755  */
2756 static irqreturn_t ab8500_charger_usbchthprotf_handler(int irq, void *_di)
2757 {
2758 	struct ab8500_charger *di = _di;
2759 
2760 	dev_dbg(di->dev,
2761 		"Die temp ok for USB charger thermal protection threshold\n");
2762 	queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2763 
2764 	return IRQ_HANDLED;
2765 }
2766 
2767 /**
2768  * ab8500_charger_usbchargernotokr_handler() - USB charger not ok detected
2769  * @irq:       interrupt number
2770  * @_di:       pointer to the ab8500_charger structure
2771  *
2772  * Returns IRQ status(IRQ_HANDLED)
2773  */
2774 static irqreturn_t ab8500_charger_usbchargernotokr_handler(int irq, void *_di)
2775 {
2776 	struct ab8500_charger *di = _di;
2777 
2778 	dev_dbg(di->dev, "Not allowed USB charger detected\n");
2779 	queue_delayed_work(di->charger_wq, &di->check_usbchgnotok_work, 0);
2780 
2781 	return IRQ_HANDLED;
2782 }
2783 
2784 /**
2785  * ab8500_charger_chwdexp_handler() - Charger watchdog expired
2786  * @irq:       interrupt number
2787  * @_di:       pointer to the ab8500_charger structure
2788  *
2789  * Returns IRQ status(IRQ_HANDLED)
2790  */
2791 static irqreturn_t ab8500_charger_chwdexp_handler(int irq, void *_di)
2792 {
2793 	struct ab8500_charger *di = _di;
2794 
2795 	dev_dbg(di->dev, "Charger watchdog expired\n");
2796 
2797 	/*
2798 	 * The charger that was online when the watchdog expired
2799 	 * needs to be restarted for charging to start again
2800 	 */
2801 	if (di->ac.charger_online) {
2802 		di->ac.wd_expired = true;
2803 		ab8500_power_supply_changed(di, di->ac_chg.psy);
2804 	}
2805 	if (di->usb.charger_online) {
2806 		di->usb.wd_expired = true;
2807 		ab8500_power_supply_changed(di, di->usb_chg.psy);
2808 	}
2809 
2810 	return IRQ_HANDLED;
2811 }
2812 
2813 /**
2814  * ab8500_charger_vbuschdropend_handler() - VBUS drop removed
2815  * @irq:       interrupt number
2816  * @_di:       pointer to the ab8500_charger structure
2817  *
2818  * Returns IRQ status(IRQ_HANDLED)
2819  */
2820 static irqreturn_t ab8500_charger_vbuschdropend_handler(int irq, void *_di)
2821 {
2822 	struct ab8500_charger *di = _di;
2823 
2824 	dev_dbg(di->dev, "VBUS charger drop ended\n");
2825 	di->flags.vbus_drop_end = true;
2826 
2827 	/*
2828 	 * VBUS might have dropped due to bad connection.
2829 	 * Schedule a new input limit set to the value SW requests.
2830 	 */
2831 	queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work,
2832 			   round_jiffies(VBUS_IN_CURR_LIM_RETRY_SET_TIME * HZ));
2833 
2834 	return IRQ_HANDLED;
2835 }
2836 
2837 /**
2838  * ab8500_charger_vbusovv_handler() - VBUS overvoltage detected
2839  * @irq:       interrupt number
2840  * @_di:       pointer to the ab8500_charger structure
2841  *
2842  * Returns IRQ status(IRQ_HANDLED)
2843  */
2844 static irqreturn_t ab8500_charger_vbusovv_handler(int irq, void *_di)
2845 {
2846 	struct ab8500_charger *di = _di;
2847 
2848 	dev_dbg(di->dev, "VBUS overvoltage detected\n");
2849 	di->flags.vbus_ovv = true;
2850 	ab8500_power_supply_changed(di, di->usb_chg.psy);
2851 
2852 	/* Schedule a new HW failure check */
2853 	queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2854 
2855 	return IRQ_HANDLED;
2856 }
2857 
2858 /**
2859  * ab8500_charger_ac_get_property() - get the ac/mains properties
2860  * @psy:       pointer to the power_supply structure
2861  * @psp:       pointer to the power_supply_property structure
2862  * @val:       pointer to the power_supply_propval union
2863  *
2864  * This function gets called when an application tries to get the ac/mains
2865  * properties by reading the sysfs files.
2866  * AC/Mains properties are online, present and voltage.
2867  * online:     ac/mains charging is in progress or not
2868  * present:    presence of the ac/mains
2869  * voltage:    AC/Mains voltage
2870  * Returns error code in case of failure else 0(on success)
2871  */
2872 static int ab8500_charger_ac_get_property(struct power_supply *psy,
2873 	enum power_supply_property psp,
2874 	union power_supply_propval *val)
2875 {
2876 	struct ab8500_charger *di;
2877 	int ret;
2878 
2879 	di = to_ab8500_charger_ac_device_info(psy_to_ux500_charger(psy));
2880 
2881 	switch (psp) {
2882 	case POWER_SUPPLY_PROP_HEALTH:
2883 		if (di->flags.mainextchnotok)
2884 			val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
2885 		else if (di->ac.wd_expired || di->usb.wd_expired)
2886 			val->intval = POWER_SUPPLY_HEALTH_DEAD;
2887 		else if (di->flags.main_thermal_prot)
2888 			val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
2889 		else
2890 			val->intval = POWER_SUPPLY_HEALTH_GOOD;
2891 		break;
2892 	case POWER_SUPPLY_PROP_ONLINE:
2893 		val->intval = di->ac.charger_online;
2894 		break;
2895 	case POWER_SUPPLY_PROP_PRESENT:
2896 		val->intval = di->ac.charger_connected;
2897 		break;
2898 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2899 		ret = ab8500_charger_get_ac_voltage(di);
2900 		if (ret >= 0)
2901 			di->ac.charger_voltage = ret;
2902 		/* On error, use previous value */
2903 		val->intval = di->ac.charger_voltage * 1000;
2904 		break;
2905 	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
2906 		/*
2907 		 * This property is used to indicate when CV mode is entered
2908 		 * for the AC charger
2909 		 */
2910 		di->ac.cv_active = ab8500_charger_ac_cv(di);
2911 		val->intval = di->ac.cv_active;
2912 		break;
2913 	case POWER_SUPPLY_PROP_CURRENT_NOW:
2914 		ret = ab8500_charger_get_ac_current(di);
2915 		if (ret >= 0)
2916 			di->ac.charger_current = ret;
2917 		val->intval = di->ac.charger_current * 1000;
2918 		break;
2919 	default:
2920 		return -EINVAL;
2921 	}
2922 	return 0;
2923 }
2924 
2925 /**
2926  * ab8500_charger_usb_get_property() - get the usb properties
2927  * @psy:        pointer to the power_supply structure
2928  * @psp:        pointer to the power_supply_property structure
2929  * @val:        pointer to the power_supply_propval union
2930  *
2931  * This function gets called when an application tries to get the usb
2932  * properties by reading the sysfs files.
2933  * USB properties are online, present and voltage.
2934  * online:     usb charging is in progress or not
2935  * present:    presence of the usb
2936  * voltage:    vbus voltage
2937  * Returns error code in case of failure else 0(on success)
2938  */
2939 static int ab8500_charger_usb_get_property(struct power_supply *psy,
2940 	enum power_supply_property psp,
2941 	union power_supply_propval *val)
2942 {
2943 	struct ab8500_charger *di;
2944 	int ret;
2945 
2946 	di = to_ab8500_charger_usb_device_info(psy_to_ux500_charger(psy));
2947 
2948 	switch (psp) {
2949 	case POWER_SUPPLY_PROP_HEALTH:
2950 		if (di->flags.usbchargernotok)
2951 			val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
2952 		else if (di->ac.wd_expired || di->usb.wd_expired)
2953 			val->intval = POWER_SUPPLY_HEALTH_DEAD;
2954 		else if (di->flags.usb_thermal_prot)
2955 			val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
2956 		else if (di->flags.vbus_ovv)
2957 			val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
2958 		else
2959 			val->intval = POWER_SUPPLY_HEALTH_GOOD;
2960 		break;
2961 	case POWER_SUPPLY_PROP_ONLINE:
2962 		val->intval = di->usb.charger_online;
2963 		break;
2964 	case POWER_SUPPLY_PROP_PRESENT:
2965 		val->intval = di->usb.charger_connected;
2966 		break;
2967 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2968 		ret = ab8500_charger_get_vbus_voltage(di);
2969 		if (ret >= 0)
2970 			di->usb.charger_voltage = ret;
2971 		val->intval = di->usb.charger_voltage * 1000;
2972 		break;
2973 	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
2974 		/*
2975 		 * This property is used to indicate when CV mode is entered
2976 		 * for the USB charger
2977 		 */
2978 		di->usb.cv_active = ab8500_charger_usb_cv(di);
2979 		val->intval = di->usb.cv_active;
2980 		break;
2981 	case POWER_SUPPLY_PROP_CURRENT_NOW:
2982 		ret = ab8500_charger_get_usb_current(di);
2983 		if (ret >= 0)
2984 			di->usb.charger_current = ret;
2985 		val->intval = di->usb.charger_current * 1000;
2986 		break;
2987 	case POWER_SUPPLY_PROP_CURRENT_AVG:
2988 		/*
2989 		 * This property is used to indicate when VBUS has collapsed
2990 		 * due to too high output current from the USB charger
2991 		 */
2992 		if (di->flags.vbus_collapse)
2993 			val->intval = 1;
2994 		else
2995 			val->intval = 0;
2996 		break;
2997 	default:
2998 		return -EINVAL;
2999 	}
3000 	return 0;
3001 }
3002 
3003 /**
3004  * ab8500_charger_init_hw_registers() - Set up charger related registers
3005  * @di:		pointer to the ab8500_charger structure
3006  *
3007  * Set up charger OVV, watchdog and maximum voltage registers as well as
3008  * charging of the backup battery
3009  */
3010 static int ab8500_charger_init_hw_registers(struct ab8500_charger *di)
3011 {
3012 	int ret = 0;
3013 	u8 bup_vch_range = 0, vbup33_vrtcn = 0;
3014 
3015 	/* Setup maximum charger current and voltage for ABB cut2.0 */
3016 	if (!is_ab8500_1p1_or_earlier(di->parent)) {
3017 		ret = abx500_set_register_interruptible(di->dev,
3018 			AB8500_CHARGER,
3019 			AB8500_CH_VOLT_LVL_MAX_REG, CH_VOL_LVL_4P6);
3020 		if (ret) {
3021 			dev_err(di->dev,
3022 				"failed to set CH_VOLT_LVL_MAX_REG\n");
3023 			goto out;
3024 		}
3025 
3026 		ret = abx500_set_register_interruptible(di->dev,
3027 			AB8500_CHARGER, AB8500_CH_OPT_CRNTLVL_MAX_REG,
3028 			CH_OP_CUR_LVL_1P6);
3029 		if (ret) {
3030 			dev_err(di->dev,
3031 				"failed to set CH_OPT_CRNTLVL_MAX_REG\n");
3032 			goto out;
3033 		}
3034 	}
3035 
3036 	if (is_ab8505_2p0(di->parent))
3037 		ret = abx500_mask_and_set_register_interruptible(di->dev,
3038 			AB8500_CHARGER,
3039 			AB8500_USBCH_CTRL2_REG,
3040 			VBUS_AUTO_IN_CURR_LIM_ENA,
3041 			VBUS_AUTO_IN_CURR_LIM_ENA);
3042 	else
3043 		/*
3044 		 * VBUS OVV set to 6.3V and enable automatic current limitation
3045 		 */
3046 		ret = abx500_set_register_interruptible(di->dev,
3047 			AB8500_CHARGER,
3048 			AB8500_USBCH_CTRL2_REG,
3049 			VBUS_OVV_SELECT_6P3V | VBUS_AUTO_IN_CURR_LIM_ENA);
3050 	if (ret) {
3051 		dev_err(di->dev,
3052 			"failed to set automatic current limitation\n");
3053 		goto out;
3054 	}
3055 
3056 	/* Enable main watchdog in OTP */
3057 	ret = abx500_set_register_interruptible(di->dev,
3058 		AB8500_OTP_EMUL, AB8500_OTP_CONF_15, OTP_ENABLE_WD);
3059 	if (ret) {
3060 		dev_err(di->dev, "failed to enable main WD in OTP\n");
3061 		goto out;
3062 	}
3063 
3064 	/* Enable main watchdog */
3065 	ret = abx500_set_register_interruptible(di->dev,
3066 		AB8500_SYS_CTRL2_BLOCK,
3067 		AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_ENA);
3068 	if (ret) {
3069 		dev_err(di->dev, "failed to enable main watchdog\n");
3070 		goto out;
3071 	}
3072 
3073 	/*
3074 	 * Due to internal synchronisation, Enable and Kick watchdog bits
3075 	 * cannot be enabled in a single write.
3076 	 * A minimum delay of 2*32 kHz period (62.5µs) must be inserted
3077 	 * between writing Enable then Kick bits.
3078 	 */
3079 	udelay(63);
3080 
3081 	/* Kick main watchdog */
3082 	ret = abx500_set_register_interruptible(di->dev,
3083 		AB8500_SYS_CTRL2_BLOCK,
3084 		AB8500_MAIN_WDOG_CTRL_REG,
3085 		(MAIN_WDOG_ENA | MAIN_WDOG_KICK));
3086 	if (ret) {
3087 		dev_err(di->dev, "failed to kick main watchdog\n");
3088 		goto out;
3089 	}
3090 
3091 	/* Disable main watchdog */
3092 	ret = abx500_set_register_interruptible(di->dev,
3093 		AB8500_SYS_CTRL2_BLOCK,
3094 		AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_DIS);
3095 	if (ret) {
3096 		dev_err(di->dev, "failed to disable main watchdog\n");
3097 		goto out;
3098 	}
3099 
3100 	/* Set watchdog timeout */
3101 	ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
3102 		AB8500_CH_WD_TIMER_REG, WD_TIMER);
3103 	if (ret) {
3104 		dev_err(di->dev, "failed to set charger watchdog timeout\n");
3105 		goto out;
3106 	}
3107 
3108 	ret = ab8500_charger_led_en(di, false);
3109 	if (ret < 0) {
3110 		dev_err(di->dev, "failed to disable LED\n");
3111 		goto out;
3112 	}
3113 
3114 	/* Backup battery voltage and current */
3115 	if (di->bm->bkup_bat_v > BUP_VCH_SEL_3P1V)
3116 		bup_vch_range = BUP_VCH_RANGE;
3117 	if (di->bm->bkup_bat_v == BUP_VCH_SEL_3P3V)
3118 		vbup33_vrtcn = VBUP33_VRTCN;
3119 
3120 	ret = abx500_set_register_interruptible(di->dev,
3121 		AB8500_RTC,
3122 		AB8500_RTC_BACKUP_CHG_REG,
3123 		(di->bm->bkup_bat_v & 0x3) | di->bm->bkup_bat_i);
3124 	if (ret) {
3125 		dev_err(di->dev, "failed to setup backup battery charging\n");
3126 		goto out;
3127 	}
3128 
3129 	/* Enable backup battery charging */
3130 	ret = abx500_mask_and_set_register_interruptible(di->dev,
3131 		AB8500_RTC, AB8500_RTC_CTRL_REG,
3132 		RTC_BUP_CH_ENA, RTC_BUP_CH_ENA);
3133 	if (ret < 0) {
3134 		dev_err(di->dev, "%s mask and set failed\n", __func__);
3135 		goto out;
3136 	}
3137 
3138 out:
3139 	return ret;
3140 }
3141 
3142 /*
3143  * ab8500 charger driver interrupts and their respective isr
3144  */
3145 static struct ab8500_charger_interrupts ab8500_charger_irq[] = {
3146 	{"MAIN_CH_UNPLUG_DET", ab8500_charger_mainchunplugdet_handler},
3147 	{"MAIN_CHARGE_PLUG_DET", ab8500_charger_mainchplugdet_handler},
3148 	{"MAIN_EXT_CH_NOT_OK", ab8500_charger_mainextchnotok_handler},
3149 	{"MAIN_CH_TH_PROT_R", ab8500_charger_mainchthprotr_handler},
3150 	{"MAIN_CH_TH_PROT_F", ab8500_charger_mainchthprotf_handler},
3151 	{"VBUS_DET_F", ab8500_charger_vbusdetf_handler},
3152 	{"VBUS_DET_R", ab8500_charger_vbusdetr_handler},
3153 	{"USB_LINK_STATUS", ab8500_charger_usblinkstatus_handler},
3154 	{"USB_CH_TH_PROT_R", ab8500_charger_usbchthprotr_handler},
3155 	{"USB_CH_TH_PROT_F", ab8500_charger_usbchthprotf_handler},
3156 	{"USB_CHARGER_NOT_OKR", ab8500_charger_usbchargernotokr_handler},
3157 	{"VBUS_OVV", ab8500_charger_vbusovv_handler},
3158 	{"CH_WD_EXP", ab8500_charger_chwdexp_handler},
3159 	{"VBUS_CH_DROP_END", ab8500_charger_vbuschdropend_handler},
3160 };
3161 
3162 static int ab8500_charger_usb_notifier_call(struct notifier_block *nb,
3163 		unsigned long event, void *power)
3164 {
3165 	struct ab8500_charger *di =
3166 		container_of(nb, struct ab8500_charger, nb);
3167 	enum ab8500_usb_state bm_usb_state;
3168 	unsigned mA = *((unsigned *)power);
3169 
3170 	if (!di)
3171 		return NOTIFY_DONE;
3172 
3173 	if (event != USB_EVENT_VBUS) {
3174 		dev_dbg(di->dev, "not a standard host, returning\n");
3175 		return NOTIFY_DONE;
3176 	}
3177 
3178 	/* TODO: State is fabricate  here. See if charger really needs USB
3179 	 * state or if mA is enough
3180 	 */
3181 	if ((di->usb_state.usb_current == 2) && (mA > 2))
3182 		bm_usb_state = AB8500_BM_USB_STATE_RESUME;
3183 	else if (mA == 0)
3184 		bm_usb_state = AB8500_BM_USB_STATE_RESET_HS;
3185 	else if (mA == 2)
3186 		bm_usb_state = AB8500_BM_USB_STATE_SUSPEND;
3187 	else if (mA >= 8) /* 8, 100, 500 */
3188 		bm_usb_state = AB8500_BM_USB_STATE_CONFIGURED;
3189 	else /* Should never occur */
3190 		bm_usb_state = AB8500_BM_USB_STATE_RESET_FS;
3191 
3192 	dev_dbg(di->dev, "%s usb_state: 0x%02x mA: %d\n",
3193 		__func__, bm_usb_state, mA);
3194 
3195 	spin_lock(&di->usb_state.usb_lock);
3196 	di->usb_state.state_tmp = bm_usb_state;
3197 	di->usb_state.usb_current_tmp = mA;
3198 	spin_unlock(&di->usb_state.usb_lock);
3199 
3200 	/*
3201 	 * wait for some time until you get updates from the usb stack
3202 	 * and negotiations are completed
3203 	 */
3204 	queue_delayed_work(di->charger_wq, &di->usb_state_changed_work, HZ/2);
3205 
3206 	return NOTIFY_OK;
3207 }
3208 
3209 #if defined(CONFIG_PM)
3210 static int ab8500_charger_resume(struct platform_device *pdev)
3211 {
3212 	int ret;
3213 	struct ab8500_charger *di = platform_get_drvdata(pdev);
3214 
3215 	/*
3216 	 * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
3217 	 * logic. That means we have to continously kick the charger
3218 	 * watchdog even when no charger is connected. This is only
3219 	 * valid once the AC charger has been enabled. This is
3220 	 * a bug that is not handled by the algorithm and the
3221 	 * watchdog have to be kicked by the charger driver
3222 	 * when the AC charger is disabled
3223 	 */
3224 	if (di->ac_conn && is_ab8500_1p1_or_earlier(di->parent)) {
3225 		ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
3226 			AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
3227 		if (ret)
3228 			dev_err(di->dev, "Failed to kick WD!\n");
3229 
3230 		/* If not already pending start a new timer */
3231 		queue_delayed_work(di->charger_wq, &di->kick_wd_work,
3232 				   round_jiffies(WD_KICK_INTERVAL));
3233 	}
3234 
3235 	/* If we still have a HW failure, schedule a new check */
3236 	if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
3237 		queue_delayed_work(di->charger_wq,
3238 			&di->check_hw_failure_work, 0);
3239 	}
3240 
3241 	if (di->flags.vbus_drop_end)
3242 		queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work, 0);
3243 
3244 	return 0;
3245 }
3246 
3247 static int ab8500_charger_suspend(struct platform_device *pdev,
3248 	pm_message_t state)
3249 {
3250 	struct ab8500_charger *di = platform_get_drvdata(pdev);
3251 
3252 	/* Cancel any pending jobs */
3253 	cancel_delayed_work(&di->check_hw_failure_work);
3254 	cancel_delayed_work(&di->vbus_drop_end_work);
3255 
3256 	flush_delayed_work(&di->attach_work);
3257 	flush_delayed_work(&di->usb_charger_attached_work);
3258 	flush_delayed_work(&di->ac_charger_attached_work);
3259 	flush_delayed_work(&di->check_usbchgnotok_work);
3260 	flush_delayed_work(&di->check_vbat_work);
3261 	flush_delayed_work(&di->kick_wd_work);
3262 
3263 	flush_work(&di->usb_link_status_work);
3264 	flush_work(&di->ac_work);
3265 	flush_work(&di->detect_usb_type_work);
3266 
3267 	if (atomic_read(&di->current_stepping_sessions))
3268 		return -EAGAIN;
3269 
3270 	return 0;
3271 }
3272 #else
3273 #define ab8500_charger_suspend      NULL
3274 #define ab8500_charger_resume       NULL
3275 #endif
3276 
3277 static struct notifier_block charger_nb = {
3278 	.notifier_call = ab8500_external_charger_prepare,
3279 };
3280 
3281 static int ab8500_charger_remove(struct platform_device *pdev)
3282 {
3283 	struct ab8500_charger *di = platform_get_drvdata(pdev);
3284 	int i, irq, ret;
3285 
3286 	/* Disable AC charging */
3287 	ab8500_charger_ac_en(&di->ac_chg, false, 0, 0);
3288 
3289 	/* Disable USB charging */
3290 	ab8500_charger_usb_en(&di->usb_chg, false, 0, 0);
3291 
3292 	/* Disable interrupts */
3293 	for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
3294 		irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3295 		free_irq(irq, di);
3296 	}
3297 
3298 	/* Backup battery voltage and current disable */
3299 	ret = abx500_mask_and_set_register_interruptible(di->dev,
3300 		AB8500_RTC, AB8500_RTC_CTRL_REG, RTC_BUP_CH_ENA, 0);
3301 	if (ret < 0)
3302 		dev_err(di->dev, "%s mask and set failed\n", __func__);
3303 
3304 	usb_unregister_notifier(di->usb_phy, &di->nb);
3305 	usb_put_phy(di->usb_phy);
3306 
3307 	/* Delete the work queue */
3308 	destroy_workqueue(di->charger_wq);
3309 
3310 	/* Unregister external charger enable notifier */
3311 	if (!di->ac_chg.enabled)
3312 		blocking_notifier_chain_unregister(
3313 			&charger_notifier_list, &charger_nb);
3314 
3315 	flush_scheduled_work();
3316 	if (di->usb_chg.enabled)
3317 		power_supply_unregister(di->usb_chg.psy);
3318 
3319 	if (di->ac_chg.enabled && !di->ac_chg.external)
3320 		power_supply_unregister(di->ac_chg.psy);
3321 
3322 	return 0;
3323 }
3324 
3325 static char *supply_interface[] = {
3326 	"ab8500_chargalg",
3327 	"ab8500_fg",
3328 	"ab8500_btemp",
3329 };
3330 
3331 static const struct power_supply_desc ab8500_ac_chg_desc = {
3332 	.name		= "ab8500_ac",
3333 	.type		= POWER_SUPPLY_TYPE_MAINS,
3334 	.properties	= ab8500_charger_ac_props,
3335 	.num_properties	= ARRAY_SIZE(ab8500_charger_ac_props),
3336 	.get_property	= ab8500_charger_ac_get_property,
3337 };
3338 
3339 static const struct power_supply_desc ab8500_usb_chg_desc = {
3340 	.name		= "ab8500_usb",
3341 	.type		= POWER_SUPPLY_TYPE_USB,
3342 	.properties	= ab8500_charger_usb_props,
3343 	.num_properties	= ARRAY_SIZE(ab8500_charger_usb_props),
3344 	.get_property	= ab8500_charger_usb_get_property,
3345 };
3346 
3347 static int ab8500_charger_probe(struct platform_device *pdev)
3348 {
3349 	struct device_node *np = pdev->dev.of_node;
3350 	struct abx500_bm_data *plat = pdev->dev.platform_data;
3351 	struct power_supply_config ac_psy_cfg = {}, usb_psy_cfg = {};
3352 	struct ab8500_charger *di;
3353 	int irq, i, charger_status, ret = 0, ch_stat;
3354 
3355 	di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
3356 	if (!di) {
3357 		dev_err(&pdev->dev, "%s no mem for ab8500_charger\n", __func__);
3358 		return -ENOMEM;
3359 	}
3360 
3361 	if (!plat) {
3362 		dev_err(&pdev->dev, "no battery management data supplied\n");
3363 		return -EINVAL;
3364 	}
3365 	di->bm = plat;
3366 
3367 	if (np) {
3368 		ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
3369 		if (ret) {
3370 			dev_err(&pdev->dev, "failed to get battery information\n");
3371 			return ret;
3372 		}
3373 		di->autopower_cfg = of_property_read_bool(np, "autopower_cfg");
3374 	} else
3375 		di->autopower_cfg = false;
3376 
3377 	/* get parent data */
3378 	di->dev = &pdev->dev;
3379 	di->parent = dev_get_drvdata(pdev->dev.parent);
3380 	di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
3381 
3382 	/* initialize lock */
3383 	spin_lock_init(&di->usb_state.usb_lock);
3384 	mutex_init(&di->usb_ipt_crnt_lock);
3385 
3386 	di->autopower = false;
3387 	di->invalid_charger_detect_state = 0;
3388 
3389 	/* AC and USB supply config */
3390 	ac_psy_cfg.supplied_to = supply_interface;
3391 	ac_psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
3392 	ac_psy_cfg.drv_data = &di->ac_chg;
3393 	usb_psy_cfg.supplied_to = supply_interface;
3394 	usb_psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
3395 	usb_psy_cfg.drv_data = &di->usb_chg;
3396 
3397 	/* AC supply */
3398 	/* ux500_charger sub-class */
3399 	di->ac_chg.ops.enable = &ab8500_charger_ac_en;
3400 	di->ac_chg.ops.check_enable = &ab8500_charger_ac_check_enable;
3401 	di->ac_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
3402 	di->ac_chg.ops.update_curr = &ab8500_charger_update_charger_current;
3403 	di->ac_chg.max_out_volt = ab8500_charger_voltage_map[
3404 		ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
3405 	di->ac_chg.max_out_curr =
3406 		di->bm->chg_output_curr[di->bm->n_chg_out_curr - 1];
3407 	di->ac_chg.wdt_refresh = CHG_WD_INTERVAL;
3408 	di->ac_chg.enabled = di->bm->ac_enabled;
3409 	di->ac_chg.external = false;
3410 
3411 	/*notifier for external charger enabling*/
3412 	if (!di->ac_chg.enabled)
3413 		blocking_notifier_chain_register(
3414 			&charger_notifier_list, &charger_nb);
3415 
3416 	/* USB supply */
3417 	/* ux500_charger sub-class */
3418 	di->usb_chg.ops.enable = &ab8500_charger_usb_en;
3419 	di->usb_chg.ops.check_enable = &ab8500_charger_usb_check_enable;
3420 	di->usb_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
3421 	di->usb_chg.ops.update_curr = &ab8500_charger_update_charger_current;
3422 	di->usb_chg.max_out_volt = ab8500_charger_voltage_map[
3423 		ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
3424 	di->usb_chg.max_out_curr =
3425 		di->bm->chg_output_curr[di->bm->n_chg_out_curr - 1];
3426 	di->usb_chg.wdt_refresh = CHG_WD_INTERVAL;
3427 	di->usb_chg.enabled = di->bm->usb_enabled;
3428 	di->usb_chg.external = false;
3429 	di->usb_state.usb_current = -1;
3430 
3431 	/* Create a work queue for the charger */
3432 	di->charger_wq = alloc_ordered_workqueue("ab8500_charger_wq",
3433 						 WQ_MEM_RECLAIM);
3434 	if (di->charger_wq == NULL) {
3435 		dev_err(di->dev, "failed to create work queue\n");
3436 		return -ENOMEM;
3437 	}
3438 
3439 	mutex_init(&di->charger_attached_mutex);
3440 
3441 	/* Init work for HW failure check */
3442 	INIT_DEFERRABLE_WORK(&di->check_hw_failure_work,
3443 		ab8500_charger_check_hw_failure_work);
3444 	INIT_DEFERRABLE_WORK(&di->check_usbchgnotok_work,
3445 		ab8500_charger_check_usbchargernotok_work);
3446 
3447 	INIT_DELAYED_WORK(&di->ac_charger_attached_work,
3448 			  ab8500_charger_ac_attached_work);
3449 	INIT_DELAYED_WORK(&di->usb_charger_attached_work,
3450 			  ab8500_charger_usb_attached_work);
3451 
3452 	/*
3453 	 * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
3454 	 * logic. That means we have to continously kick the charger
3455 	 * watchdog even when no charger is connected. This is only
3456 	 * valid once the AC charger has been enabled. This is
3457 	 * a bug that is not handled by the algorithm and the
3458 	 * watchdog have to be kicked by the charger driver
3459 	 * when the AC charger is disabled
3460 	 */
3461 	INIT_DEFERRABLE_WORK(&di->kick_wd_work,
3462 		ab8500_charger_kick_watchdog_work);
3463 
3464 	INIT_DEFERRABLE_WORK(&di->check_vbat_work,
3465 		ab8500_charger_check_vbat_work);
3466 
3467 	INIT_DELAYED_WORK(&di->attach_work,
3468 		ab8500_charger_usb_link_attach_work);
3469 
3470 	INIT_DELAYED_WORK(&di->usb_state_changed_work,
3471 		ab8500_charger_usb_state_changed_work);
3472 
3473 	INIT_DELAYED_WORK(&di->vbus_drop_end_work,
3474 		ab8500_charger_vbus_drop_end_work);
3475 
3476 	/* Init work for charger detection */
3477 	INIT_WORK(&di->usb_link_status_work,
3478 		ab8500_charger_usb_link_status_work);
3479 	INIT_WORK(&di->ac_work, ab8500_charger_ac_work);
3480 	INIT_WORK(&di->detect_usb_type_work,
3481 		ab8500_charger_detect_usb_type_work);
3482 
3483 	/* Init work for checking HW status */
3484 	INIT_WORK(&di->check_main_thermal_prot_work,
3485 		ab8500_charger_check_main_thermal_prot_work);
3486 	INIT_WORK(&di->check_usb_thermal_prot_work,
3487 		ab8500_charger_check_usb_thermal_prot_work);
3488 
3489 	/*
3490 	 * VDD ADC supply needs to be enabled from this driver when there
3491 	 * is a charger connected to avoid erroneous BTEMP_HIGH/LOW
3492 	 * interrupts during charging
3493 	 */
3494 	di->regu = devm_regulator_get(di->dev, "vddadc");
3495 	if (IS_ERR(di->regu)) {
3496 		ret = PTR_ERR(di->regu);
3497 		dev_err(di->dev, "failed to get vddadc regulator\n");
3498 		goto free_charger_wq;
3499 	}
3500 
3501 
3502 	/* Initialize OVV, and other registers */
3503 	ret = ab8500_charger_init_hw_registers(di);
3504 	if (ret) {
3505 		dev_err(di->dev, "failed to initialize ABB registers\n");
3506 		goto free_charger_wq;
3507 	}
3508 
3509 	/* Register AC charger class */
3510 	if (di->ac_chg.enabled) {
3511 		di->ac_chg.psy = power_supply_register(di->dev,
3512 						       &ab8500_ac_chg_desc,
3513 						       &ac_psy_cfg);
3514 		if (IS_ERR(di->ac_chg.psy)) {
3515 			dev_err(di->dev, "failed to register AC charger\n");
3516 			ret = PTR_ERR(di->ac_chg.psy);
3517 			goto free_charger_wq;
3518 		}
3519 	}
3520 
3521 	/* Register USB charger class */
3522 	if (di->usb_chg.enabled) {
3523 		di->usb_chg.psy = power_supply_register(di->dev,
3524 							&ab8500_usb_chg_desc,
3525 							&usb_psy_cfg);
3526 		if (IS_ERR(di->usb_chg.psy)) {
3527 			dev_err(di->dev, "failed to register USB charger\n");
3528 			ret = PTR_ERR(di->usb_chg.psy);
3529 			goto free_ac;
3530 		}
3531 	}
3532 
3533 	di->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
3534 	if (IS_ERR_OR_NULL(di->usb_phy)) {
3535 		dev_err(di->dev, "failed to get usb transceiver\n");
3536 		ret = -EINVAL;
3537 		goto free_usb;
3538 	}
3539 	di->nb.notifier_call = ab8500_charger_usb_notifier_call;
3540 	ret = usb_register_notifier(di->usb_phy, &di->nb);
3541 	if (ret) {
3542 		dev_err(di->dev, "failed to register usb notifier\n");
3543 		goto put_usb_phy;
3544 	}
3545 
3546 	/* Identify the connected charger types during startup */
3547 	charger_status = ab8500_charger_detect_chargers(di, true);
3548 	if (charger_status & AC_PW_CONN) {
3549 		di->ac.charger_connected = 1;
3550 		di->ac_conn = true;
3551 		ab8500_power_supply_changed(di, di->ac_chg.psy);
3552 		sysfs_notify(&di->ac_chg.psy->dev.kobj, NULL, "present");
3553 	}
3554 
3555 	if (charger_status & USB_PW_CONN) {
3556 		di->vbus_detected = true;
3557 		di->vbus_detected_start = true;
3558 		queue_work(di->charger_wq,
3559 			&di->detect_usb_type_work);
3560 	}
3561 
3562 	/* Register interrupts */
3563 	for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
3564 		irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3565 		ret = request_threaded_irq(irq, NULL, ab8500_charger_irq[i].isr,
3566 			IRQF_SHARED | IRQF_NO_SUSPEND,
3567 			ab8500_charger_irq[i].name, di);
3568 
3569 		if (ret != 0) {
3570 			dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
3571 				, ab8500_charger_irq[i].name, irq, ret);
3572 			goto free_irq;
3573 		}
3574 		dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
3575 			ab8500_charger_irq[i].name, irq, ret);
3576 	}
3577 
3578 	platform_set_drvdata(pdev, di);
3579 
3580 	mutex_lock(&di->charger_attached_mutex);
3581 
3582 	ch_stat = ab8500_charger_detect_chargers(di, false);
3583 
3584 	if ((ch_stat & AC_PW_CONN) == AC_PW_CONN) {
3585 		if (is_ab8500(di->parent))
3586 			queue_delayed_work(di->charger_wq,
3587 					   &di->ac_charger_attached_work,
3588 					   HZ);
3589 	}
3590 	if ((ch_stat & USB_PW_CONN) == USB_PW_CONN) {
3591 		if (is_ab8500(di->parent))
3592 			queue_delayed_work(di->charger_wq,
3593 					   &di->usb_charger_attached_work,
3594 					   HZ);
3595 	}
3596 
3597 	mutex_unlock(&di->charger_attached_mutex);
3598 
3599 	return ret;
3600 
3601 free_irq:
3602 	usb_unregister_notifier(di->usb_phy, &di->nb);
3603 
3604 	/* We also have to free all successfully registered irqs */
3605 	for (i = i - 1; i >= 0; i--) {
3606 		irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3607 		free_irq(irq, di);
3608 	}
3609 put_usb_phy:
3610 	usb_put_phy(di->usb_phy);
3611 free_usb:
3612 	if (di->usb_chg.enabled)
3613 		power_supply_unregister(di->usb_chg.psy);
3614 free_ac:
3615 	if (di->ac_chg.enabled)
3616 		power_supply_unregister(di->ac_chg.psy);
3617 free_charger_wq:
3618 	destroy_workqueue(di->charger_wq);
3619 	return ret;
3620 }
3621 
3622 static const struct of_device_id ab8500_charger_match[] = {
3623 	{ .compatible = "stericsson,ab8500-charger", },
3624 	{ },
3625 };
3626 
3627 static struct platform_driver ab8500_charger_driver = {
3628 	.probe = ab8500_charger_probe,
3629 	.remove = ab8500_charger_remove,
3630 	.suspend = ab8500_charger_suspend,
3631 	.resume = ab8500_charger_resume,
3632 	.driver = {
3633 		.name = "ab8500-charger",
3634 		.of_match_table = ab8500_charger_match,
3635 	},
3636 };
3637 
3638 static int __init ab8500_charger_init(void)
3639 {
3640 	return platform_driver_register(&ab8500_charger_driver);
3641 }
3642 
3643 static void __exit ab8500_charger_exit(void)
3644 {
3645 	platform_driver_unregister(&ab8500_charger_driver);
3646 }
3647 
3648 subsys_initcall_sync(ab8500_charger_init);
3649 module_exit(ab8500_charger_exit);
3650 
3651 MODULE_LICENSE("GPL v2");
3652 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
3653 MODULE_ALIAS("platform:ab8500-charger");
3654 MODULE_DESCRIPTION("AB8500 charger management driver");
3655