1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
3 *
4 * Driver for Option High Speed Mobile Devices.
5 *
6 * Copyright (C) 2008 Option International
7 * Filip Aben <f.aben@option.com>
8 * Denis Joseph Barrow <d.barow@option.com>
9 * Jan Dumon <j.dumon@option.com>
10 * Copyright (C) 2007 Andrew Bird (Sphere Systems Ltd)
11 * <ajb@spheresystems.co.uk>
12 * Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
13 * Copyright (C) 2008 Novell, Inc.
14 *
15 *****************************************************************************/
16
17 /******************************************************************************
18 *
19 * Description of the device:
20 *
21 * Interface 0: Contains the IP network interface on the bulk end points.
22 * The multiplexed serial ports are using the interrupt and
23 * control endpoints.
24 * Interrupt contains a bitmap telling which multiplexed
25 * serialport needs servicing.
26 *
27 * Interface 1: Diagnostics port, uses bulk only, do not submit urbs until the
28 * port is opened, as this have a huge impact on the network port
29 * throughput.
30 *
31 * Interface 2: Standard modem interface - circuit switched interface, this
32 * can be used to make a standard ppp connection however it
33 * should not be used in conjunction with the IP network interface
34 * enabled for USB performance reasons i.e. if using this set
35 * ideally disable_net=1.
36 *
37 *****************************************************************************/
38
39 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
40
41 #include <linux/sched/signal.h>
42 #include <linux/slab.h>
43 #include <linux/init.h>
44 #include <linux/delay.h>
45 #include <linux/netdevice.h>
46 #include <linux/module.h>
47 #include <linux/ethtool.h>
48 #include <linux/usb.h>
49 #include <linux/tty.h>
50 #include <linux/tty_driver.h>
51 #include <linux/tty_flip.h>
52 #include <linux/kmod.h>
53 #include <linux/rfkill.h>
54 #include <linux/ip.h>
55 #include <linux/uaccess.h>
56 #include <linux/usb/cdc.h>
57 #include <net/arp.h>
58 #include <asm/byteorder.h>
59 #include <linux/serial_core.h>
60 #include <linux/serial.h>
61
62
63 #define MOD_AUTHOR "Option Wireless"
64 #define MOD_DESCRIPTION "USB High Speed Option driver"
65
66 #define HSO_MAX_NET_DEVICES 10
67 #define HSO__MAX_MTU 2048
68 #define DEFAULT_MTU 1500
69 #define DEFAULT_MRU 1500
70
71 #define CTRL_URB_RX_SIZE 1024
72 #define CTRL_URB_TX_SIZE 64
73
74 #define BULK_URB_RX_SIZE 4096
75 #define BULK_URB_TX_SIZE 8192
76
77 #define MUX_BULK_RX_BUF_SIZE HSO__MAX_MTU
78 #define MUX_BULK_TX_BUF_SIZE HSO__MAX_MTU
79 #define MUX_BULK_RX_BUF_COUNT 4
80 #define USB_TYPE_OPTION_VENDOR 0x20
81
82 /* These definitions are used with the struct hso_net flags element */
83 /* - use *_bit operations on it. (bit indices not values.) */
84 #define HSO_NET_RUNNING 0
85
86 #define HSO_NET_TX_TIMEOUT (HZ*10)
87
88 #define HSO_SERIAL_MAGIC 0x48534f31
89
90 /* Number of ttys to handle */
91 #define HSO_SERIAL_TTY_MINORS 256
92
93 #define MAX_RX_URBS 2
94
95 /*****************************************************************************/
96 /* Debugging functions */
97 /*****************************************************************************/
98 #define hso_dbg(lvl, fmt, ...) \
99 do { \
100 if ((lvl) & debug) \
101 pr_info("[%d:%s] " fmt, \
102 __LINE__, __func__, ##__VA_ARGS__); \
103 } while (0)
104
105 /*****************************************************************************/
106 /* Enumerators */
107 /*****************************************************************************/
108 enum pkt_parse_state {
109 WAIT_IP,
110 WAIT_DATA,
111 WAIT_SYNC
112 };
113
114 /*****************************************************************************/
115 /* Structs */
116 /*****************************************************************************/
117
118 struct hso_shared_int {
119 struct usb_endpoint_descriptor *intr_endp;
120 void *shared_intr_buf;
121 struct urb *shared_intr_urb;
122 struct usb_device *usb;
123 int use_count;
124 int ref_count;
125 struct mutex shared_int_lock;
126 };
127
128 struct hso_net {
129 struct hso_device *parent;
130 struct net_device *net;
131 struct rfkill *rfkill;
132 char name[24];
133
134 struct usb_endpoint_descriptor *in_endp;
135 struct usb_endpoint_descriptor *out_endp;
136
137 struct urb *mux_bulk_rx_urb_pool[MUX_BULK_RX_BUF_COUNT];
138 struct urb *mux_bulk_tx_urb;
139 void *mux_bulk_rx_buf_pool[MUX_BULK_RX_BUF_COUNT];
140 void *mux_bulk_tx_buf;
141
142 struct sk_buff *skb_rx_buf;
143 struct sk_buff *skb_tx_buf;
144
145 enum pkt_parse_state rx_parse_state;
146 spinlock_t net_lock;
147
148 unsigned short rx_buf_size;
149 unsigned short rx_buf_missing;
150 struct iphdr rx_ip_hdr;
151
152 unsigned long flags;
153 };
154
155 enum rx_ctrl_state{
156 RX_IDLE,
157 RX_SENT,
158 RX_PENDING
159 };
160
161 #define BM_REQUEST_TYPE (0xa1)
162 #define B_NOTIFICATION (0x20)
163 #define W_VALUE (0x0)
164 #define W_LENGTH (0x2)
165
166 #define B_OVERRUN (0x1<<6)
167 #define B_PARITY (0x1<<5)
168 #define B_FRAMING (0x1<<4)
169 #define B_RING_SIGNAL (0x1<<3)
170 #define B_BREAK (0x1<<2)
171 #define B_TX_CARRIER (0x1<<1)
172 #define B_RX_CARRIER (0x1<<0)
173
174 struct hso_serial_state_notification {
175 u8 bmRequestType;
176 u8 bNotification;
177 u16 wValue;
178 u16 wIndex;
179 u16 wLength;
180 u16 UART_state_bitmap;
181 } __packed;
182
183 struct hso_tiocmget {
184 struct mutex mutex;
185 wait_queue_head_t waitq;
186 int intr_completed;
187 struct usb_endpoint_descriptor *endp;
188 struct urb *urb;
189 struct hso_serial_state_notification *serial_state_notification;
190 u16 prev_UART_state_bitmap;
191 struct uart_icount icount;
192 };
193
194
195 struct hso_serial {
196 struct hso_device *parent;
197 int magic;
198 u8 minor;
199
200 struct hso_shared_int *shared_int;
201
202 /* rx/tx urb could be either a bulk urb or a control urb depending
203 on which serial port it is used on. */
204 struct urb *rx_urb[MAX_RX_URBS];
205 u8 num_rx_urbs;
206 u8 *rx_data[MAX_RX_URBS];
207 u16 rx_data_length; /* should contain allocated length */
208
209 struct urb *tx_urb;
210 u8 *tx_data;
211 u8 *tx_buffer;
212 u16 tx_data_length; /* should contain allocated length */
213 u16 tx_data_count;
214 u16 tx_buffer_count;
215 struct usb_ctrlrequest ctrl_req_tx;
216 struct usb_ctrlrequest ctrl_req_rx;
217
218 struct usb_endpoint_descriptor *in_endp;
219 struct usb_endpoint_descriptor *out_endp;
220
221 enum rx_ctrl_state rx_state;
222 u8 rts_state;
223 u8 dtr_state;
224 unsigned tx_urb_used:1;
225
226 struct tty_port port;
227 /* from usb_serial_port */
228 spinlock_t serial_lock;
229
230 int (*write_data) (struct hso_serial *serial);
231 struct hso_tiocmget *tiocmget;
232 /* Hacks required to get flow control
233 * working on the serial receive buffers
234 * so as not to drop characters on the floor.
235 */
236 int curr_rx_urb_idx;
237 u8 rx_urb_filled[MAX_RX_URBS];
238 struct tasklet_struct unthrottle_tasklet;
239 };
240
241 struct hso_device {
242 union {
243 struct hso_serial *dev_serial;
244 struct hso_net *dev_net;
245 } port_data;
246
247 u32 port_spec;
248
249 u8 is_active;
250 u8 usb_gone;
251 struct work_struct async_get_intf;
252 struct work_struct async_put_intf;
253
254 struct usb_device *usb;
255 struct usb_interface *interface;
256
257 struct device *dev;
258 struct kref ref;
259 struct mutex mutex;
260 };
261
262 /* Type of interface */
263 #define HSO_INTF_MASK 0xFF00
264 #define HSO_INTF_MUX 0x0100
265 #define HSO_INTF_BULK 0x0200
266
267 /* Type of port */
268 #define HSO_PORT_MASK 0xFF
269 #define HSO_PORT_NO_PORT 0x0
270 #define HSO_PORT_CONTROL 0x1
271 #define HSO_PORT_APP 0x2
272 #define HSO_PORT_GPS 0x3
273 #define HSO_PORT_PCSC 0x4
274 #define HSO_PORT_APP2 0x5
275 #define HSO_PORT_GPS_CONTROL 0x6
276 #define HSO_PORT_MSD 0x7
277 #define HSO_PORT_VOICE 0x8
278 #define HSO_PORT_DIAG2 0x9
279 #define HSO_PORT_DIAG 0x10
280 #define HSO_PORT_MODEM 0x11
281 #define HSO_PORT_NETWORK 0x12
282
283 /* Additional device info */
284 #define HSO_INFO_MASK 0xFF000000
285 #define HSO_INFO_CRC_BUG 0x01000000
286
287 /*****************************************************************************/
288 /* Prototypes */
289 /*****************************************************************************/
290 /* Serial driver functions */
291 static int hso_serial_tiocmset(struct tty_struct *tty,
292 unsigned int set, unsigned int clear);
293 static void ctrl_callback(struct urb *urb);
294 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial);
295 static void hso_kick_transmit(struct hso_serial *serial);
296 /* Helper functions */
297 static int hso_mux_submit_intr_urb(struct hso_shared_int *mux_int,
298 struct usb_device *usb, gfp_t gfp);
299 static void handle_usb_error(int status, const char *function,
300 struct hso_device *hso_dev);
301 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
302 int type, int dir);
303 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports);
304 static void hso_free_interface(struct usb_interface *intf);
305 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags);
306 static int hso_stop_serial_device(struct hso_device *hso_dev);
307 static int hso_start_net_device(struct hso_device *hso_dev);
308 static void hso_free_shared_int(struct hso_shared_int *shared_int);
309 static int hso_stop_net_device(struct hso_device *hso_dev);
310 static void hso_serial_ref_free(struct kref *ref);
311 static void hso_std_serial_read_bulk_callback(struct urb *urb);
312 static int hso_mux_serial_read(struct hso_serial *serial);
313 static void async_get_intf(struct work_struct *data);
314 static void async_put_intf(struct work_struct *data);
315 static int hso_put_activity(struct hso_device *hso_dev);
316 static int hso_get_activity(struct hso_device *hso_dev);
317 static void tiocmget_intr_callback(struct urb *urb);
318 /*****************************************************************************/
319 /* Helping functions */
320 /*****************************************************************************/
321
322 /* #define DEBUG */
323
dev2net(struct hso_device * hso_dev)324 static inline struct hso_net *dev2net(struct hso_device *hso_dev)
325 {
326 return hso_dev->port_data.dev_net;
327 }
328
dev2ser(struct hso_device * hso_dev)329 static inline struct hso_serial *dev2ser(struct hso_device *hso_dev)
330 {
331 return hso_dev->port_data.dev_serial;
332 }
333
334 /* Debugging functions */
335 #ifdef DEBUG
dbg_dump(int line_count,const char * func_name,unsigned char * buf,unsigned int len)336 static void dbg_dump(int line_count, const char *func_name, unsigned char *buf,
337 unsigned int len)
338 {
339 static char name[255];
340
341 sprintf(name, "hso[%d:%s]", line_count, func_name);
342 print_hex_dump_bytes(name, DUMP_PREFIX_NONE, buf, len);
343 }
344
345 #define DUMP(buf_, len_) \
346 dbg_dump(__LINE__, __func__, (unsigned char *)buf_, len_)
347
348 #define DUMP1(buf_, len_) \
349 do { \
350 if (0x01 & debug) \
351 DUMP(buf_, len_); \
352 } while (0)
353 #else
354 #define DUMP(buf_, len_)
355 #define DUMP1(buf_, len_)
356 #endif
357
358 /* module parameters */
359 static int debug;
360 static int tty_major;
361 static int disable_net;
362
363 /* driver info */
364 static const char driver_name[] = "hso";
365 static const char tty_filename[] = "ttyHS";
366 static const char *version = __FILE__ ": " MOD_AUTHOR;
367 /* the usb driver itself (registered in hso_init) */
368 static struct usb_driver hso_driver;
369 /* serial structures */
370 static struct tty_driver *tty_drv;
371 static struct hso_device *serial_table[HSO_SERIAL_TTY_MINORS];
372 static struct hso_device *network_table[HSO_MAX_NET_DEVICES];
373 static DEFINE_SPINLOCK(serial_table_lock);
374
375 static const s32 default_port_spec[] = {
376 HSO_INTF_MUX | HSO_PORT_NETWORK,
377 HSO_INTF_BULK | HSO_PORT_DIAG,
378 HSO_INTF_BULK | HSO_PORT_MODEM,
379 0
380 };
381
382 static const s32 icon321_port_spec[] = {
383 HSO_INTF_MUX | HSO_PORT_NETWORK,
384 HSO_INTF_BULK | HSO_PORT_DIAG2,
385 HSO_INTF_BULK | HSO_PORT_MODEM,
386 HSO_INTF_BULK | HSO_PORT_DIAG,
387 0
388 };
389
390 #define default_port_device(vendor, product) \
391 USB_DEVICE(vendor, product), \
392 .driver_info = (kernel_ulong_t)default_port_spec
393
394 #define icon321_port_device(vendor, product) \
395 USB_DEVICE(vendor, product), \
396 .driver_info = (kernel_ulong_t)icon321_port_spec
397
398 /* list of devices we support */
399 static const struct usb_device_id hso_ids[] = {
400 {default_port_device(0x0af0, 0x6711)},
401 {default_port_device(0x0af0, 0x6731)},
402 {default_port_device(0x0af0, 0x6751)},
403 {default_port_device(0x0af0, 0x6771)},
404 {default_port_device(0x0af0, 0x6791)},
405 {default_port_device(0x0af0, 0x6811)},
406 {default_port_device(0x0af0, 0x6911)},
407 {default_port_device(0x0af0, 0x6951)},
408 {default_port_device(0x0af0, 0x6971)},
409 {default_port_device(0x0af0, 0x7011)},
410 {default_port_device(0x0af0, 0x7031)},
411 {default_port_device(0x0af0, 0x7051)},
412 {default_port_device(0x0af0, 0x7071)},
413 {default_port_device(0x0af0, 0x7111)},
414 {default_port_device(0x0af0, 0x7211)},
415 {default_port_device(0x0af0, 0x7251)},
416 {default_port_device(0x0af0, 0x7271)},
417 {default_port_device(0x0af0, 0x7311)},
418 {default_port_device(0x0af0, 0xc031)}, /* Icon-Edge */
419 {icon321_port_device(0x0af0, 0xd013)}, /* Module HSxPA */
420 {icon321_port_device(0x0af0, 0xd031)}, /* Icon-321 */
421 {icon321_port_device(0x0af0, 0xd033)}, /* Icon-322 */
422 {USB_DEVICE(0x0af0, 0x7301)}, /* GE40x */
423 {USB_DEVICE(0x0af0, 0x7361)}, /* GE40x */
424 {USB_DEVICE(0x0af0, 0x7381)}, /* GE40x */
425 {USB_DEVICE(0x0af0, 0x7401)}, /* GI 0401 */
426 {USB_DEVICE(0x0af0, 0x7501)}, /* GTM 382 */
427 {USB_DEVICE(0x0af0, 0x7601)}, /* GE40x */
428 {USB_DEVICE(0x0af0, 0x7701)},
429 {USB_DEVICE(0x0af0, 0x7706)},
430 {USB_DEVICE(0x0af0, 0x7801)},
431 {USB_DEVICE(0x0af0, 0x7901)},
432 {USB_DEVICE(0x0af0, 0x7A01)},
433 {USB_DEVICE(0x0af0, 0x7A05)},
434 {USB_DEVICE(0x0af0, 0x8200)},
435 {USB_DEVICE(0x0af0, 0x8201)},
436 {USB_DEVICE(0x0af0, 0x8300)},
437 {USB_DEVICE(0x0af0, 0x8302)},
438 {USB_DEVICE(0x0af0, 0x8304)},
439 {USB_DEVICE(0x0af0, 0x8400)},
440 {USB_DEVICE(0x0af0, 0x8600)},
441 {USB_DEVICE(0x0af0, 0x8800)},
442 {USB_DEVICE(0x0af0, 0x8900)},
443 {USB_DEVICE(0x0af0, 0x9000)},
444 {USB_DEVICE(0x0af0, 0x9200)}, /* Option GTM671WFS */
445 {USB_DEVICE(0x0af0, 0xd035)},
446 {USB_DEVICE(0x0af0, 0xd055)},
447 {USB_DEVICE(0x0af0, 0xd155)},
448 {USB_DEVICE(0x0af0, 0xd255)},
449 {USB_DEVICE(0x0af0, 0xd057)},
450 {USB_DEVICE(0x0af0, 0xd157)},
451 {USB_DEVICE(0x0af0, 0xd257)},
452 {USB_DEVICE(0x0af0, 0xd357)},
453 {USB_DEVICE(0x0af0, 0xd058)},
454 {USB_DEVICE(0x0af0, 0xc100)},
455 {}
456 };
457 MODULE_DEVICE_TABLE(usb, hso_ids);
458
459 /* Sysfs attribute */
hsotype_show(struct device * dev,struct device_attribute * attr,char * buf)460 static ssize_t hsotype_show(struct device *dev,
461 struct device_attribute *attr, char *buf)
462 {
463 struct hso_device *hso_dev = dev_get_drvdata(dev);
464 char *port_name;
465
466 if (!hso_dev)
467 return 0;
468
469 switch (hso_dev->port_spec & HSO_PORT_MASK) {
470 case HSO_PORT_CONTROL:
471 port_name = "Control";
472 break;
473 case HSO_PORT_APP:
474 port_name = "Application";
475 break;
476 case HSO_PORT_APP2:
477 port_name = "Application2";
478 break;
479 case HSO_PORT_GPS:
480 port_name = "GPS";
481 break;
482 case HSO_PORT_GPS_CONTROL:
483 port_name = "GPS Control";
484 break;
485 case HSO_PORT_PCSC:
486 port_name = "PCSC";
487 break;
488 case HSO_PORT_DIAG:
489 port_name = "Diagnostic";
490 break;
491 case HSO_PORT_DIAG2:
492 port_name = "Diagnostic2";
493 break;
494 case HSO_PORT_MODEM:
495 port_name = "Modem";
496 break;
497 case HSO_PORT_NETWORK:
498 port_name = "Network";
499 break;
500 default:
501 port_name = "Unknown";
502 break;
503 }
504
505 return sprintf(buf, "%s\n", port_name);
506 }
507 static DEVICE_ATTR_RO(hsotype);
508
509 static struct attribute *hso_serial_dev_attrs[] = {
510 &dev_attr_hsotype.attr,
511 NULL
512 };
513
514 ATTRIBUTE_GROUPS(hso_serial_dev);
515
hso_urb_to_index(struct hso_serial * serial,struct urb * urb)516 static int hso_urb_to_index(struct hso_serial *serial, struct urb *urb)
517 {
518 int idx;
519
520 for (idx = 0; idx < serial->num_rx_urbs; idx++)
521 if (serial->rx_urb[idx] == urb)
522 return idx;
523 dev_err(serial->parent->dev, "hso_urb_to_index failed\n");
524 return -1;
525 }
526
527 /* converts mux value to a port spec value */
hso_mux_to_port(int mux)528 static u32 hso_mux_to_port(int mux)
529 {
530 u32 result;
531
532 switch (mux) {
533 case 0x1:
534 result = HSO_PORT_CONTROL;
535 break;
536 case 0x2:
537 result = HSO_PORT_APP;
538 break;
539 case 0x4:
540 result = HSO_PORT_PCSC;
541 break;
542 case 0x8:
543 result = HSO_PORT_GPS;
544 break;
545 case 0x10:
546 result = HSO_PORT_APP2;
547 break;
548 default:
549 result = HSO_PORT_NO_PORT;
550 }
551 return result;
552 }
553
554 /* converts port spec value to a mux value */
hso_port_to_mux(int port)555 static u32 hso_port_to_mux(int port)
556 {
557 u32 result;
558
559 switch (port & HSO_PORT_MASK) {
560 case HSO_PORT_CONTROL:
561 result = 0x0;
562 break;
563 case HSO_PORT_APP:
564 result = 0x1;
565 break;
566 case HSO_PORT_PCSC:
567 result = 0x2;
568 break;
569 case HSO_PORT_GPS:
570 result = 0x3;
571 break;
572 case HSO_PORT_APP2:
573 result = 0x4;
574 break;
575 default:
576 result = 0x0;
577 }
578 return result;
579 }
580
get_serial_by_shared_int_and_type(struct hso_shared_int * shared_int,int mux)581 static struct hso_serial *get_serial_by_shared_int_and_type(
582 struct hso_shared_int *shared_int,
583 int mux)
584 {
585 int i, port;
586
587 port = hso_mux_to_port(mux);
588
589 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
590 if (serial_table[i] &&
591 (dev2ser(serial_table[i])->shared_int == shared_int) &&
592 ((serial_table[i]->port_spec & HSO_PORT_MASK) == port)) {
593 return dev2ser(serial_table[i]);
594 }
595 }
596
597 return NULL;
598 }
599
get_serial_by_index(unsigned index)600 static struct hso_serial *get_serial_by_index(unsigned index)
601 {
602 struct hso_serial *serial = NULL;
603 unsigned long flags;
604
605 spin_lock_irqsave(&serial_table_lock, flags);
606 if (serial_table[index])
607 serial = dev2ser(serial_table[index]);
608 spin_unlock_irqrestore(&serial_table_lock, flags);
609
610 return serial;
611 }
612
obtain_minor(struct hso_serial * serial)613 static int obtain_minor(struct hso_serial *serial)
614 {
615 int index;
616 unsigned long flags;
617
618 spin_lock_irqsave(&serial_table_lock, flags);
619 for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) {
620 if (serial_table[index] == NULL) {
621 serial_table[index] = serial->parent;
622 serial->minor = index;
623 spin_unlock_irqrestore(&serial_table_lock, flags);
624 return 0;
625 }
626 }
627 spin_unlock_irqrestore(&serial_table_lock, flags);
628
629 pr_err("%s: no free serial devices in table\n", __func__);
630 return -1;
631 }
632
release_minor(struct hso_serial * serial)633 static void release_minor(struct hso_serial *serial)
634 {
635 unsigned long flags;
636
637 spin_lock_irqsave(&serial_table_lock, flags);
638 serial_table[serial->minor] = NULL;
639 spin_unlock_irqrestore(&serial_table_lock, flags);
640 }
641
handle_usb_error(int status,const char * function,struct hso_device * hso_dev)642 static void handle_usb_error(int status, const char *function,
643 struct hso_device *hso_dev)
644 {
645 char *explanation;
646
647 switch (status) {
648 case -ENODEV:
649 explanation = "no device";
650 break;
651 case -ENOENT:
652 explanation = "endpoint not enabled";
653 break;
654 case -EPIPE:
655 explanation = "endpoint stalled";
656 break;
657 case -ENOSPC:
658 explanation = "not enough bandwidth";
659 break;
660 case -ESHUTDOWN:
661 explanation = "device disabled";
662 break;
663 case -EHOSTUNREACH:
664 explanation = "device suspended";
665 break;
666 case -EINVAL:
667 case -EAGAIN:
668 case -EFBIG:
669 case -EMSGSIZE:
670 explanation = "internal error";
671 break;
672 case -EILSEQ:
673 case -EPROTO:
674 case -ETIME:
675 case -ETIMEDOUT:
676 explanation = "protocol error";
677 if (hso_dev)
678 usb_queue_reset_device(hso_dev->interface);
679 break;
680 default:
681 explanation = "unknown status";
682 break;
683 }
684
685 /* log a meaningful explanation of an USB status */
686 hso_dbg(0x1, "%s: received USB status - %s (%d)\n",
687 function, explanation, status);
688 }
689
690 /* Network interface functions */
691
692 /* called when net interface is brought up by ifconfig */
hso_net_open(struct net_device * net)693 static int hso_net_open(struct net_device *net)
694 {
695 struct hso_net *odev = netdev_priv(net);
696 unsigned long flags = 0;
697
698 if (!odev) {
699 dev_err(&net->dev, "No net device !\n");
700 return -ENODEV;
701 }
702
703 odev->skb_tx_buf = NULL;
704
705 /* setup environment */
706 spin_lock_irqsave(&odev->net_lock, flags);
707 odev->rx_parse_state = WAIT_IP;
708 odev->rx_buf_size = 0;
709 odev->rx_buf_missing = sizeof(struct iphdr);
710 spin_unlock_irqrestore(&odev->net_lock, flags);
711
712 /* We are up and running. */
713 set_bit(HSO_NET_RUNNING, &odev->flags);
714 hso_start_net_device(odev->parent);
715
716 /* Tell the kernel we are ready to start receiving from it */
717 netif_start_queue(net);
718
719 return 0;
720 }
721
722 /* called when interface is brought down by ifconfig */
hso_net_close(struct net_device * net)723 static int hso_net_close(struct net_device *net)
724 {
725 struct hso_net *odev = netdev_priv(net);
726
727 /* we don't need the queue anymore */
728 netif_stop_queue(net);
729 /* no longer running */
730 clear_bit(HSO_NET_RUNNING, &odev->flags);
731
732 hso_stop_net_device(odev->parent);
733
734 /* done */
735 return 0;
736 }
737
738 /* USB tells is xmit done, we should start the netqueue again */
write_bulk_callback(struct urb * urb)739 static void write_bulk_callback(struct urb *urb)
740 {
741 struct hso_net *odev = urb->context;
742 int status = urb->status;
743
744 /* Sanity check */
745 if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
746 dev_err(&urb->dev->dev, "%s: device not running\n", __func__);
747 return;
748 }
749
750 /* Do we still have a valid kernel network device? */
751 if (!netif_device_present(odev->net)) {
752 dev_err(&urb->dev->dev, "%s: net device not present\n",
753 __func__);
754 return;
755 }
756
757 /* log status, but don't act on it, we don't need to resubmit anything
758 * anyhow */
759 if (status)
760 handle_usb_error(status, __func__, odev->parent);
761
762 hso_put_activity(odev->parent);
763
764 /* Tell the network interface we are ready for another frame */
765 netif_wake_queue(odev->net);
766 }
767
768 /* called by kernel when we need to transmit a packet */
hso_net_start_xmit(struct sk_buff * skb,struct net_device * net)769 static netdev_tx_t hso_net_start_xmit(struct sk_buff *skb,
770 struct net_device *net)
771 {
772 struct hso_net *odev = netdev_priv(net);
773 int result;
774
775 /* Tell the kernel, "No more frames 'til we are done with this one." */
776 netif_stop_queue(net);
777 if (hso_get_activity(odev->parent) == -EAGAIN) {
778 odev->skb_tx_buf = skb;
779 return NETDEV_TX_OK;
780 }
781
782 /* log if asked */
783 DUMP1(skb->data, skb->len);
784 /* Copy it from kernel memory to OUR memory */
785 memcpy(odev->mux_bulk_tx_buf, skb->data, skb->len);
786 hso_dbg(0x1, "len: %d/%d\n", skb->len, MUX_BULK_TX_BUF_SIZE);
787
788 /* Fill in the URB for shipping it out. */
789 usb_fill_bulk_urb(odev->mux_bulk_tx_urb,
790 odev->parent->usb,
791 usb_sndbulkpipe(odev->parent->usb,
792 odev->out_endp->
793 bEndpointAddress & 0x7F),
794 odev->mux_bulk_tx_buf, skb->len, write_bulk_callback,
795 odev);
796
797 /* Deal with the Zero Length packet problem, I hope */
798 odev->mux_bulk_tx_urb->transfer_flags |= URB_ZERO_PACKET;
799
800 /* Send the URB on its merry way. */
801 result = usb_submit_urb(odev->mux_bulk_tx_urb, GFP_ATOMIC);
802 if (result) {
803 dev_warn(&odev->parent->interface->dev,
804 "failed mux_bulk_tx_urb %d\n", result);
805 net->stats.tx_errors++;
806 netif_start_queue(net);
807 } else {
808 net->stats.tx_packets++;
809 net->stats.tx_bytes += skb->len;
810 }
811 dev_kfree_skb(skb);
812 /* we're done */
813 return NETDEV_TX_OK;
814 }
815
816 static const struct ethtool_ops ops = {
817 .get_link = ethtool_op_get_link
818 };
819
820 /* called when a packet did not ack after watchdogtimeout */
hso_net_tx_timeout(struct net_device * net,unsigned int txqueue)821 static void hso_net_tx_timeout(struct net_device *net, unsigned int txqueue)
822 {
823 struct hso_net *odev = netdev_priv(net);
824
825 if (!odev)
826 return;
827
828 /* Tell syslog we are hosed. */
829 dev_warn(&net->dev, "Tx timed out.\n");
830
831 /* Tear the waiting frame off the list */
832 if (odev->mux_bulk_tx_urb)
833 usb_unlink_urb(odev->mux_bulk_tx_urb);
834
835 /* Update statistics */
836 net->stats.tx_errors++;
837 }
838
839 /* make a real packet from the received USB buffer */
packetizeRx(struct hso_net * odev,unsigned char * ip_pkt,unsigned int count,unsigned char is_eop)840 static void packetizeRx(struct hso_net *odev, unsigned char *ip_pkt,
841 unsigned int count, unsigned char is_eop)
842 {
843 unsigned short temp_bytes;
844 unsigned short buffer_offset = 0;
845 unsigned short frame_len;
846
847 /* log if needed */
848 hso_dbg(0x1, "Rx %d bytes\n", count);
849 DUMP(ip_pkt, min(128, (int)count));
850
851 while (count) {
852 switch (odev->rx_parse_state) {
853 case WAIT_IP:
854 /* waiting for IP header. */
855 /* wanted bytes - size of ip header */
856 temp_bytes =
857 (count <
858 odev->rx_buf_missing) ? count : odev->
859 rx_buf_missing;
860
861 memcpy(((unsigned char *)(&odev->rx_ip_hdr)) +
862 odev->rx_buf_size, ip_pkt + buffer_offset,
863 temp_bytes);
864
865 odev->rx_buf_size += temp_bytes;
866 buffer_offset += temp_bytes;
867 odev->rx_buf_missing -= temp_bytes;
868 count -= temp_bytes;
869
870 if (!odev->rx_buf_missing) {
871 /* header is complete allocate an sk_buffer and
872 * continue to WAIT_DATA */
873 frame_len = ntohs(odev->rx_ip_hdr.tot_len);
874
875 if ((frame_len > DEFAULT_MRU) ||
876 (frame_len < sizeof(struct iphdr))) {
877 dev_err(&odev->net->dev,
878 "Invalid frame (%d) length\n",
879 frame_len);
880 odev->rx_parse_state = WAIT_SYNC;
881 continue;
882 }
883 /* Allocate an sk_buff */
884 odev->skb_rx_buf = netdev_alloc_skb(odev->net,
885 frame_len);
886 if (!odev->skb_rx_buf) {
887 /* We got no receive buffer. */
888 hso_dbg(0x1, "could not allocate memory\n");
889 odev->rx_parse_state = WAIT_SYNC;
890 continue;
891 }
892
893 /* Copy what we got so far. make room for iphdr
894 * after tail. */
895 skb_put_data(odev->skb_rx_buf,
896 (char *)&(odev->rx_ip_hdr),
897 sizeof(struct iphdr));
898
899 /* ETH_HLEN */
900 odev->rx_buf_size = sizeof(struct iphdr);
901
902 /* Filip actually use .tot_len */
903 odev->rx_buf_missing =
904 frame_len - sizeof(struct iphdr);
905 odev->rx_parse_state = WAIT_DATA;
906 }
907 break;
908
909 case WAIT_DATA:
910 temp_bytes = (count < odev->rx_buf_missing)
911 ? count : odev->rx_buf_missing;
912
913 /* Copy the rest of the bytes that are left in the
914 * buffer into the waiting sk_buf. */
915 /* Make room for temp_bytes after tail. */
916 skb_put_data(odev->skb_rx_buf,
917 ip_pkt + buffer_offset,
918 temp_bytes);
919
920 odev->rx_buf_missing -= temp_bytes;
921 count -= temp_bytes;
922 buffer_offset += temp_bytes;
923 odev->rx_buf_size += temp_bytes;
924 if (!odev->rx_buf_missing) {
925 /* Packet is complete. Inject into stack. */
926 /* We have IP packet here */
927 odev->skb_rx_buf->protocol = cpu_to_be16(ETH_P_IP);
928 skb_reset_mac_header(odev->skb_rx_buf);
929
930 /* Ship it off to the kernel */
931 netif_rx(odev->skb_rx_buf);
932 /* No longer our buffer. */
933 odev->skb_rx_buf = NULL;
934
935 /* update out statistics */
936 odev->net->stats.rx_packets++;
937
938 odev->net->stats.rx_bytes += odev->rx_buf_size;
939
940 odev->rx_buf_size = 0;
941 odev->rx_buf_missing = sizeof(struct iphdr);
942 odev->rx_parse_state = WAIT_IP;
943 }
944 break;
945
946 case WAIT_SYNC:
947 hso_dbg(0x1, " W_S\n");
948 count = 0;
949 break;
950 default:
951 hso_dbg(0x1, "\n");
952 count--;
953 break;
954 }
955 }
956
957 /* Recovery mechanism for WAIT_SYNC state. */
958 if (is_eop) {
959 if (odev->rx_parse_state == WAIT_SYNC) {
960 odev->rx_parse_state = WAIT_IP;
961 odev->rx_buf_size = 0;
962 odev->rx_buf_missing = sizeof(struct iphdr);
963 }
964 }
965 }
966
fix_crc_bug(struct urb * urb,__le16 max_packet_size)967 static void fix_crc_bug(struct urb *urb, __le16 max_packet_size)
968 {
969 static const u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
970 u32 rest = urb->actual_length % le16_to_cpu(max_packet_size);
971
972 if (((rest == 5) || (rest == 6)) &&
973 !memcmp(((u8 *)urb->transfer_buffer) + urb->actual_length - 4,
974 crc_check, 4)) {
975 urb->actual_length -= 4;
976 }
977 }
978
979 /* Moving data from usb to kernel (in interrupt state) */
read_bulk_callback(struct urb * urb)980 static void read_bulk_callback(struct urb *urb)
981 {
982 struct hso_net *odev = urb->context;
983 struct net_device *net;
984 int result;
985 unsigned long flags;
986 int status = urb->status;
987
988 /* is al ok? (Filip: Who's Al ?) */
989 if (status) {
990 handle_usb_error(status, __func__, odev->parent);
991 return;
992 }
993
994 /* Sanity check */
995 if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
996 hso_dbg(0x1, "BULK IN callback but driver is not active!\n");
997 return;
998 }
999 usb_mark_last_busy(urb->dev);
1000
1001 net = odev->net;
1002
1003 if (!netif_device_present(net)) {
1004 /* Somebody killed our network interface... */
1005 return;
1006 }
1007
1008 if (odev->parent->port_spec & HSO_INFO_CRC_BUG)
1009 fix_crc_bug(urb, odev->in_endp->wMaxPacketSize);
1010
1011 /* do we even have a packet? */
1012 if (urb->actual_length) {
1013 /* Handle the IP stream, add header and push it onto network
1014 * stack if the packet is complete. */
1015 spin_lock_irqsave(&odev->net_lock, flags);
1016 packetizeRx(odev, urb->transfer_buffer, urb->actual_length,
1017 (urb->transfer_buffer_length >
1018 urb->actual_length) ? 1 : 0);
1019 spin_unlock_irqrestore(&odev->net_lock, flags);
1020 }
1021
1022 /* We are done with this URB, resubmit it. Prep the USB to wait for
1023 * another frame. Reuse same as received. */
1024 usb_fill_bulk_urb(urb,
1025 odev->parent->usb,
1026 usb_rcvbulkpipe(odev->parent->usb,
1027 odev->in_endp->
1028 bEndpointAddress & 0x7F),
1029 urb->transfer_buffer, MUX_BULK_RX_BUF_SIZE,
1030 read_bulk_callback, odev);
1031
1032 /* Give this to the USB subsystem so it can tell us when more data
1033 * arrives. */
1034 result = usb_submit_urb(urb, GFP_ATOMIC);
1035 if (result)
1036 dev_warn(&odev->parent->interface->dev,
1037 "%s failed submit mux_bulk_rx_urb %d\n", __func__,
1038 result);
1039 }
1040
1041 /* Serial driver functions */
1042
hso_init_termios(struct ktermios * termios)1043 static void hso_init_termios(struct ktermios *termios)
1044 {
1045 /*
1046 * The default requirements for this device are:
1047 */
1048 termios->c_iflag &=
1049 ~(IGNBRK /* disable ignore break */
1050 | BRKINT /* disable break causes interrupt */
1051 | PARMRK /* disable mark parity errors */
1052 | ISTRIP /* disable clear high bit of input characters */
1053 | INLCR /* disable translate NL to CR */
1054 | IGNCR /* disable ignore CR */
1055 | ICRNL /* disable translate CR to NL */
1056 | IXON); /* disable enable XON/XOFF flow control */
1057
1058 /* disable postprocess output characters */
1059 termios->c_oflag &= ~OPOST;
1060
1061 termios->c_lflag &=
1062 ~(ECHO /* disable echo input characters */
1063 | ECHONL /* disable echo new line */
1064 | ICANON /* disable erase, kill, werase, and rprnt
1065 special characters */
1066 | ISIG /* disable interrupt, quit, and suspend special
1067 characters */
1068 | IEXTEN); /* disable non-POSIX special characters */
1069
1070 termios->c_cflag &=
1071 ~(CSIZE /* no size */
1072 | PARENB /* disable parity bit */
1073 | CBAUD /* clear current baud rate */
1074 | CBAUDEX); /* clear current buad rate */
1075
1076 termios->c_cflag |= CS8; /* character size 8 bits */
1077
1078 /* baud rate 115200 */
1079 tty_termios_encode_baud_rate(termios, 115200, 115200);
1080 }
1081
_hso_serial_set_termios(struct tty_struct * tty)1082 static void _hso_serial_set_termios(struct tty_struct *tty)
1083 {
1084 struct hso_serial *serial = tty->driver_data;
1085
1086 if (!serial) {
1087 pr_err("%s: no tty structures", __func__);
1088 return;
1089 }
1090
1091 hso_dbg(0x8, "port %d\n", serial->minor);
1092
1093 /*
1094 * Fix up unsupported bits
1095 */
1096 tty->termios.c_iflag &= ~IXON; /* disable enable XON/XOFF flow control */
1097
1098 tty->termios.c_cflag &=
1099 ~(CSIZE /* no size */
1100 | PARENB /* disable parity bit */
1101 | CBAUD /* clear current baud rate */
1102 | CBAUDEX); /* clear current buad rate */
1103
1104 tty->termios.c_cflag |= CS8; /* character size 8 bits */
1105
1106 /* baud rate 115200 */
1107 tty_encode_baud_rate(tty, 115200, 115200);
1108 }
1109
hso_resubmit_rx_bulk_urb(struct hso_serial * serial,struct urb * urb)1110 static void hso_resubmit_rx_bulk_urb(struct hso_serial *serial, struct urb *urb)
1111 {
1112 int result;
1113 /* We are done with this URB, resubmit it. Prep the USB to wait for
1114 * another frame */
1115 usb_fill_bulk_urb(urb, serial->parent->usb,
1116 usb_rcvbulkpipe(serial->parent->usb,
1117 serial->in_endp->
1118 bEndpointAddress & 0x7F),
1119 urb->transfer_buffer, serial->rx_data_length,
1120 hso_std_serial_read_bulk_callback, serial);
1121 /* Give this to the USB subsystem so it can tell us when more data
1122 * arrives. */
1123 result = usb_submit_urb(urb, GFP_ATOMIC);
1124 if (result) {
1125 dev_err(&urb->dev->dev, "%s failed submit serial rx_urb %d\n",
1126 __func__, result);
1127 }
1128 }
1129
1130
1131
1132
put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial * serial)1133 static void put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial *serial)
1134 {
1135 int count;
1136 struct urb *curr_urb;
1137
1138 while (serial->rx_urb_filled[serial->curr_rx_urb_idx]) {
1139 curr_urb = serial->rx_urb[serial->curr_rx_urb_idx];
1140 count = put_rxbuf_data(curr_urb, serial);
1141 if (count == -1)
1142 return;
1143 if (count == 0) {
1144 serial->curr_rx_urb_idx++;
1145 if (serial->curr_rx_urb_idx >= serial->num_rx_urbs)
1146 serial->curr_rx_urb_idx = 0;
1147 hso_resubmit_rx_bulk_urb(serial, curr_urb);
1148 }
1149 }
1150 }
1151
put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial * serial)1152 static void put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial *serial)
1153 {
1154 int count = 0;
1155 struct urb *urb;
1156
1157 urb = serial->rx_urb[0];
1158 if (serial->port.count > 0) {
1159 count = put_rxbuf_data(urb, serial);
1160 if (count == -1)
1161 return;
1162 }
1163 /* Re issue a read as long as we receive data. */
1164
1165 if (count == 0 && ((urb->actual_length != 0) ||
1166 (serial->rx_state == RX_PENDING))) {
1167 serial->rx_state = RX_SENT;
1168 hso_mux_serial_read(serial);
1169 } else
1170 serial->rx_state = RX_IDLE;
1171 }
1172
1173
1174 /* read callback for Diag and CS port */
hso_std_serial_read_bulk_callback(struct urb * urb)1175 static void hso_std_serial_read_bulk_callback(struct urb *urb)
1176 {
1177 struct hso_serial *serial = urb->context;
1178 int status = urb->status;
1179 unsigned long flags;
1180
1181 hso_dbg(0x8, "--- Got serial_read_bulk callback %02x ---\n", status);
1182
1183 /* sanity check */
1184 if (!serial) {
1185 hso_dbg(0x1, "serial == NULL\n");
1186 return;
1187 }
1188 if (status) {
1189 handle_usb_error(status, __func__, serial->parent);
1190 return;
1191 }
1192
1193 hso_dbg(0x1, "Actual length = %d\n", urb->actual_length);
1194 DUMP1(urb->transfer_buffer, urb->actual_length);
1195
1196 /* Anyone listening? */
1197 if (serial->port.count == 0)
1198 return;
1199
1200 if (serial->parent->port_spec & HSO_INFO_CRC_BUG)
1201 fix_crc_bug(urb, serial->in_endp->wMaxPacketSize);
1202 /* Valid data, handle RX data */
1203 spin_lock_irqsave(&serial->serial_lock, flags);
1204 serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 1;
1205 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1206 spin_unlock_irqrestore(&serial->serial_lock, flags);
1207 }
1208
1209 /*
1210 * This needs to be a tasklet otherwise we will
1211 * end up recursively calling this function.
1212 */
hso_unthrottle_tasklet(struct tasklet_struct * t)1213 static void hso_unthrottle_tasklet(struct tasklet_struct *t)
1214 {
1215 struct hso_serial *serial = from_tasklet(serial, t,
1216 unthrottle_tasklet);
1217 unsigned long flags;
1218
1219 spin_lock_irqsave(&serial->serial_lock, flags);
1220 if ((serial->parent->port_spec & HSO_INTF_MUX))
1221 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1222 else
1223 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1224 spin_unlock_irqrestore(&serial->serial_lock, flags);
1225 }
1226
hso_unthrottle(struct tty_struct * tty)1227 static void hso_unthrottle(struct tty_struct *tty)
1228 {
1229 struct hso_serial *serial = tty->driver_data;
1230
1231 tasklet_hi_schedule(&serial->unthrottle_tasklet);
1232 }
1233
1234 /* open the requested serial port */
hso_serial_open(struct tty_struct * tty,struct file * filp)1235 static int hso_serial_open(struct tty_struct *tty, struct file *filp)
1236 {
1237 struct hso_serial *serial = get_serial_by_index(tty->index);
1238 int result;
1239
1240 /* sanity check */
1241 if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
1242 WARN_ON(1);
1243 tty->driver_data = NULL;
1244 hso_dbg(0x1, "Failed to open port\n");
1245 return -ENODEV;
1246 }
1247
1248 mutex_lock(&serial->parent->mutex);
1249 result = usb_autopm_get_interface(serial->parent->interface);
1250 if (result < 0)
1251 goto err_out;
1252
1253 hso_dbg(0x1, "Opening %d\n", serial->minor);
1254
1255 /* setup */
1256 tty->driver_data = serial;
1257 tty_port_tty_set(&serial->port, tty);
1258
1259 /* check for port already opened, if not set the termios */
1260 serial->port.count++;
1261 if (serial->port.count == 1) {
1262 serial->rx_state = RX_IDLE;
1263 /* Force default termio settings */
1264 _hso_serial_set_termios(tty);
1265 tasklet_setup(&serial->unthrottle_tasklet,
1266 hso_unthrottle_tasklet);
1267 result = hso_start_serial_device(serial->parent, GFP_KERNEL);
1268 if (result) {
1269 hso_stop_serial_device(serial->parent);
1270 serial->port.count--;
1271 } else {
1272 kref_get(&serial->parent->ref);
1273 }
1274 } else {
1275 hso_dbg(0x1, "Port was already open\n");
1276 }
1277
1278 usb_autopm_put_interface(serial->parent->interface);
1279
1280 /* done */
1281 if (result)
1282 hso_serial_tiocmset(tty, TIOCM_RTS | TIOCM_DTR, 0);
1283 err_out:
1284 mutex_unlock(&serial->parent->mutex);
1285 return result;
1286 }
1287
1288 /* close the requested serial port */
hso_serial_close(struct tty_struct * tty,struct file * filp)1289 static void hso_serial_close(struct tty_struct *tty, struct file *filp)
1290 {
1291 struct hso_serial *serial = tty->driver_data;
1292 u8 usb_gone;
1293
1294 hso_dbg(0x1, "Closing serial port\n");
1295
1296 /* Open failed, no close cleanup required */
1297 if (serial == NULL)
1298 return;
1299
1300 mutex_lock(&serial->parent->mutex);
1301 usb_gone = serial->parent->usb_gone;
1302
1303 if (!usb_gone)
1304 usb_autopm_get_interface(serial->parent->interface);
1305
1306 /* reset the rts and dtr */
1307 /* do the actual close */
1308 serial->port.count--;
1309
1310 if (serial->port.count <= 0) {
1311 serial->port.count = 0;
1312 tty_port_tty_set(&serial->port, NULL);
1313 if (!usb_gone)
1314 hso_stop_serial_device(serial->parent);
1315 tasklet_kill(&serial->unthrottle_tasklet);
1316 }
1317
1318 if (!usb_gone)
1319 usb_autopm_put_interface(serial->parent->interface);
1320
1321 mutex_unlock(&serial->parent->mutex);
1322 }
1323
1324 /* close the requested serial port */
hso_serial_write(struct tty_struct * tty,const u8 * buf,size_t count)1325 static ssize_t hso_serial_write(struct tty_struct *tty, const u8 *buf,
1326 size_t count)
1327 {
1328 struct hso_serial *serial = tty->driver_data;
1329 unsigned long flags;
1330
1331 /* sanity check */
1332 if (serial == NULL) {
1333 pr_err("%s: serial is NULL\n", __func__);
1334 return -ENODEV;
1335 }
1336
1337 spin_lock_irqsave(&serial->serial_lock, flags);
1338
1339 count = min_t(size_t, serial->tx_data_length - serial->tx_buffer_count,
1340 count);
1341 memcpy(serial->tx_buffer + serial->tx_buffer_count, buf, count);
1342 serial->tx_buffer_count += count;
1343
1344 spin_unlock_irqrestore(&serial->serial_lock, flags);
1345
1346 hso_kick_transmit(serial);
1347 /* done */
1348 return count;
1349 }
1350
1351 /* how much room is there for writing */
hso_serial_write_room(struct tty_struct * tty)1352 static unsigned int hso_serial_write_room(struct tty_struct *tty)
1353 {
1354 struct hso_serial *serial = tty->driver_data;
1355 unsigned int room;
1356 unsigned long flags;
1357
1358 spin_lock_irqsave(&serial->serial_lock, flags);
1359 room = serial->tx_data_length - serial->tx_buffer_count;
1360 spin_unlock_irqrestore(&serial->serial_lock, flags);
1361
1362 /* return free room */
1363 return room;
1364 }
1365
hso_serial_cleanup(struct tty_struct * tty)1366 static void hso_serial_cleanup(struct tty_struct *tty)
1367 {
1368 struct hso_serial *serial = tty->driver_data;
1369
1370 if (!serial)
1371 return;
1372
1373 kref_put(&serial->parent->ref, hso_serial_ref_free);
1374 }
1375
1376 /* setup the term */
hso_serial_set_termios(struct tty_struct * tty,const struct ktermios * old)1377 static void hso_serial_set_termios(struct tty_struct *tty,
1378 const struct ktermios *old)
1379 {
1380 struct hso_serial *serial = tty->driver_data;
1381 unsigned long flags;
1382
1383 if (old)
1384 hso_dbg(0x16, "Termios called with: cflags new[%u] - old[%u]\n",
1385 (unsigned int)tty->termios.c_cflag,
1386 (unsigned int)old->c_cflag);
1387
1388 /* the actual setup */
1389 spin_lock_irqsave(&serial->serial_lock, flags);
1390 if (serial->port.count)
1391 _hso_serial_set_termios(tty);
1392 else
1393 tty->termios = *old;
1394 spin_unlock_irqrestore(&serial->serial_lock, flags);
1395
1396 /* done */
1397 }
1398
1399 /* how many characters in the buffer */
hso_serial_chars_in_buffer(struct tty_struct * tty)1400 static unsigned int hso_serial_chars_in_buffer(struct tty_struct *tty)
1401 {
1402 struct hso_serial *serial = tty->driver_data;
1403 unsigned long flags;
1404 unsigned int chars;
1405
1406 /* sanity check */
1407 if (serial == NULL)
1408 return 0;
1409
1410 spin_lock_irqsave(&serial->serial_lock, flags);
1411 chars = serial->tx_buffer_count;
1412 spin_unlock_irqrestore(&serial->serial_lock, flags);
1413
1414 return chars;
1415 }
tiocmget_submit_urb(struct hso_serial * serial,struct hso_tiocmget * tiocmget,struct usb_device * usb)1416 static int tiocmget_submit_urb(struct hso_serial *serial,
1417 struct hso_tiocmget *tiocmget,
1418 struct usb_device *usb)
1419 {
1420 int result;
1421
1422 if (serial->parent->usb_gone)
1423 return -ENODEV;
1424 usb_fill_int_urb(tiocmget->urb, usb,
1425 usb_rcvintpipe(usb,
1426 tiocmget->endp->
1427 bEndpointAddress & 0x7F),
1428 tiocmget->serial_state_notification,
1429 sizeof(struct hso_serial_state_notification),
1430 tiocmget_intr_callback, serial,
1431 tiocmget->endp->bInterval);
1432 result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC);
1433 if (result) {
1434 dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__,
1435 result);
1436 }
1437 return result;
1438
1439 }
1440
tiocmget_intr_callback(struct urb * urb)1441 static void tiocmget_intr_callback(struct urb *urb)
1442 {
1443 struct hso_serial *serial = urb->context;
1444 struct hso_tiocmget *tiocmget;
1445 int status = urb->status;
1446 u16 UART_state_bitmap, prev_UART_state_bitmap;
1447 struct uart_icount *icount;
1448 struct hso_serial_state_notification *serial_state_notification;
1449 struct usb_device *usb;
1450 struct usb_interface *interface;
1451 int if_num;
1452
1453 /* Sanity checks */
1454 if (!serial)
1455 return;
1456 if (status) {
1457 handle_usb_error(status, __func__, serial->parent);
1458 return;
1459 }
1460
1461 /* tiocmget is only supported on HSO_PORT_MODEM */
1462 tiocmget = serial->tiocmget;
1463 if (!tiocmget)
1464 return;
1465 BUG_ON((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM);
1466
1467 usb = serial->parent->usb;
1468 interface = serial->parent->interface;
1469
1470 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1471
1472 /* wIndex should be the USB interface number of the port to which the
1473 * notification applies, which should always be the Modem port.
1474 */
1475 serial_state_notification = tiocmget->serial_state_notification;
1476 if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
1477 serial_state_notification->bNotification != B_NOTIFICATION ||
1478 le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
1479 le16_to_cpu(serial_state_notification->wIndex) != if_num ||
1480 le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
1481 dev_warn(&usb->dev,
1482 "hso received invalid serial state notification\n");
1483 DUMP(serial_state_notification,
1484 sizeof(struct hso_serial_state_notification));
1485 } else {
1486 unsigned long flags;
1487
1488 UART_state_bitmap = le16_to_cpu(serial_state_notification->
1489 UART_state_bitmap);
1490 prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap;
1491 icount = &tiocmget->icount;
1492 spin_lock_irqsave(&serial->serial_lock, flags);
1493 if ((UART_state_bitmap & B_OVERRUN) !=
1494 (prev_UART_state_bitmap & B_OVERRUN))
1495 icount->parity++;
1496 if ((UART_state_bitmap & B_PARITY) !=
1497 (prev_UART_state_bitmap & B_PARITY))
1498 icount->parity++;
1499 if ((UART_state_bitmap & B_FRAMING) !=
1500 (prev_UART_state_bitmap & B_FRAMING))
1501 icount->frame++;
1502 if ((UART_state_bitmap & B_RING_SIGNAL) &&
1503 !(prev_UART_state_bitmap & B_RING_SIGNAL))
1504 icount->rng++;
1505 if ((UART_state_bitmap & B_BREAK) !=
1506 (prev_UART_state_bitmap & B_BREAK))
1507 icount->brk++;
1508 if ((UART_state_bitmap & B_TX_CARRIER) !=
1509 (prev_UART_state_bitmap & B_TX_CARRIER))
1510 icount->dsr++;
1511 if ((UART_state_bitmap & B_RX_CARRIER) !=
1512 (prev_UART_state_bitmap & B_RX_CARRIER))
1513 icount->dcd++;
1514 tiocmget->prev_UART_state_bitmap = UART_state_bitmap;
1515 spin_unlock_irqrestore(&serial->serial_lock, flags);
1516 tiocmget->intr_completed = 1;
1517 wake_up_interruptible(&tiocmget->waitq);
1518 }
1519 memset(serial_state_notification, 0,
1520 sizeof(struct hso_serial_state_notification));
1521 tiocmget_submit_urb(serial,
1522 tiocmget,
1523 serial->parent->usb);
1524 }
1525
1526 /*
1527 * next few functions largely stolen from drivers/serial/serial_core.c
1528 */
1529 /* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1530 * - mask passed in arg for lines of interest
1531 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1532 * Caller should use TIOCGICOUNT to see which one it was
1533 */
1534 static int
hso_wait_modem_status(struct hso_serial * serial,unsigned long arg)1535 hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
1536 {
1537 DECLARE_WAITQUEUE(wait, current);
1538 struct uart_icount cprev, cnow;
1539 struct hso_tiocmget *tiocmget;
1540 int ret;
1541
1542 tiocmget = serial->tiocmget;
1543 if (!tiocmget)
1544 return -ENOENT;
1545 /*
1546 * note the counters on entry
1547 */
1548 spin_lock_irq(&serial->serial_lock);
1549 memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount));
1550 spin_unlock_irq(&serial->serial_lock);
1551 add_wait_queue(&tiocmget->waitq, &wait);
1552 for (;;) {
1553 spin_lock_irq(&serial->serial_lock);
1554 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1555 spin_unlock_irq(&serial->serial_lock);
1556 set_current_state(TASK_INTERRUPTIBLE);
1557 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1558 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1559 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd))) {
1560 ret = 0;
1561 break;
1562 }
1563 schedule();
1564 /* see if a signal did it */
1565 if (signal_pending(current)) {
1566 ret = -ERESTARTSYS;
1567 break;
1568 }
1569 cprev = cnow;
1570 }
1571 __set_current_state(TASK_RUNNING);
1572 remove_wait_queue(&tiocmget->waitq, &wait);
1573
1574 return ret;
1575 }
1576
1577 /*
1578 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1579 * Return: write counters to the user passed counter struct
1580 * NB: both 1->0 and 0->1 transitions are counted except for
1581 * RI where only 0->1 is counted.
1582 */
hso_get_count(struct tty_struct * tty,struct serial_icounter_struct * icount)1583 static int hso_get_count(struct tty_struct *tty,
1584 struct serial_icounter_struct *icount)
1585 {
1586 struct uart_icount cnow;
1587 struct hso_serial *serial = tty->driver_data;
1588 struct hso_tiocmget *tiocmget = serial->tiocmget;
1589
1590 memset(icount, 0, sizeof(struct serial_icounter_struct));
1591
1592 if (!tiocmget)
1593 return -ENOENT;
1594 spin_lock_irq(&serial->serial_lock);
1595 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1596 spin_unlock_irq(&serial->serial_lock);
1597
1598 icount->cts = cnow.cts;
1599 icount->dsr = cnow.dsr;
1600 icount->rng = cnow.rng;
1601 icount->dcd = cnow.dcd;
1602 icount->rx = cnow.rx;
1603 icount->tx = cnow.tx;
1604 icount->frame = cnow.frame;
1605 icount->overrun = cnow.overrun;
1606 icount->parity = cnow.parity;
1607 icount->brk = cnow.brk;
1608 icount->buf_overrun = cnow.buf_overrun;
1609
1610 return 0;
1611 }
1612
1613
hso_serial_tiocmget(struct tty_struct * tty)1614 static int hso_serial_tiocmget(struct tty_struct *tty)
1615 {
1616 int retval;
1617 struct hso_serial *serial = tty->driver_data;
1618 struct hso_tiocmget *tiocmget;
1619 u16 UART_state_bitmap;
1620
1621 /* sanity check */
1622 if (!serial) {
1623 hso_dbg(0x1, "no tty structures\n");
1624 return -EINVAL;
1625 }
1626 spin_lock_irq(&serial->serial_lock);
1627 retval = ((serial->rts_state) ? TIOCM_RTS : 0) |
1628 ((serial->dtr_state) ? TIOCM_DTR : 0);
1629 tiocmget = serial->tiocmget;
1630 if (tiocmget) {
1631
1632 UART_state_bitmap = le16_to_cpu(
1633 tiocmget->prev_UART_state_bitmap);
1634 if (UART_state_bitmap & B_RING_SIGNAL)
1635 retval |= TIOCM_RNG;
1636 if (UART_state_bitmap & B_RX_CARRIER)
1637 retval |= TIOCM_CD;
1638 if (UART_state_bitmap & B_TX_CARRIER)
1639 retval |= TIOCM_DSR;
1640 }
1641 spin_unlock_irq(&serial->serial_lock);
1642 return retval;
1643 }
1644
hso_serial_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1645 static int hso_serial_tiocmset(struct tty_struct *tty,
1646 unsigned int set, unsigned int clear)
1647 {
1648 int val = 0;
1649 unsigned long flags;
1650 int if_num;
1651 struct hso_serial *serial = tty->driver_data;
1652 struct usb_interface *interface;
1653
1654 /* sanity check */
1655 if (!serial) {
1656 hso_dbg(0x1, "no tty structures\n");
1657 return -EINVAL;
1658 }
1659
1660 if ((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM)
1661 return -EINVAL;
1662
1663 interface = serial->parent->interface;
1664 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1665
1666 spin_lock_irqsave(&serial->serial_lock, flags);
1667 if (set & TIOCM_RTS)
1668 serial->rts_state = 1;
1669 if (set & TIOCM_DTR)
1670 serial->dtr_state = 1;
1671
1672 if (clear & TIOCM_RTS)
1673 serial->rts_state = 0;
1674 if (clear & TIOCM_DTR)
1675 serial->dtr_state = 0;
1676
1677 if (serial->dtr_state)
1678 val |= 0x01;
1679 if (serial->rts_state)
1680 val |= 0x02;
1681
1682 spin_unlock_irqrestore(&serial->serial_lock, flags);
1683
1684 return usb_control_msg(serial->parent->usb,
1685 usb_sndctrlpipe(serial->parent->usb, 0), 0x22,
1686 0x21, val, if_num, NULL, 0,
1687 USB_CTRL_SET_TIMEOUT);
1688 }
1689
hso_serial_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)1690 static int hso_serial_ioctl(struct tty_struct *tty,
1691 unsigned int cmd, unsigned long arg)
1692 {
1693 struct hso_serial *serial = tty->driver_data;
1694 int ret = 0;
1695 hso_dbg(0x8, "IOCTL cmd: %d, arg: %ld\n", cmd, arg);
1696
1697 if (!serial)
1698 return -ENODEV;
1699 switch (cmd) {
1700 case TIOCMIWAIT:
1701 ret = hso_wait_modem_status(serial, arg);
1702 break;
1703 default:
1704 ret = -ENOIOCTLCMD;
1705 break;
1706 }
1707 return ret;
1708 }
1709
1710
1711 /* starts a transmit */
hso_kick_transmit(struct hso_serial * serial)1712 static void hso_kick_transmit(struct hso_serial *serial)
1713 {
1714 unsigned long flags;
1715 int res;
1716
1717 spin_lock_irqsave(&serial->serial_lock, flags);
1718 if (!serial->tx_buffer_count)
1719 goto out;
1720
1721 if (serial->tx_urb_used)
1722 goto out;
1723
1724 /* Wakeup USB interface if necessary */
1725 if (hso_get_activity(serial->parent) == -EAGAIN)
1726 goto out;
1727
1728 /* Switch pointers around to avoid memcpy */
1729 swap(serial->tx_buffer, serial->tx_data);
1730 serial->tx_data_count = serial->tx_buffer_count;
1731 serial->tx_buffer_count = 0;
1732
1733 /* If serial->tx_data is set, it means we switched buffers */
1734 if (serial->tx_data && serial->write_data) {
1735 res = serial->write_data(serial);
1736 if (res >= 0)
1737 serial->tx_urb_used = 1;
1738 }
1739 out:
1740 spin_unlock_irqrestore(&serial->serial_lock, flags);
1741 }
1742
1743 /* make a request (for reading and writing data to muxed serial port) */
mux_device_request(struct hso_serial * serial,u8 type,u16 port,struct urb * ctrl_urb,struct usb_ctrlrequest * ctrl_req,u8 * ctrl_urb_data,u32 size)1744 static int mux_device_request(struct hso_serial *serial, u8 type, u16 port,
1745 struct urb *ctrl_urb,
1746 struct usb_ctrlrequest *ctrl_req,
1747 u8 *ctrl_urb_data, u32 size)
1748 {
1749 int result;
1750 int pipe;
1751
1752 /* Sanity check */
1753 if (!serial || !ctrl_urb || !ctrl_req) {
1754 pr_err("%s: Wrong arguments\n", __func__);
1755 return -EINVAL;
1756 }
1757
1758 /* initialize */
1759 ctrl_req->wValue = 0;
1760 ctrl_req->wIndex = cpu_to_le16(hso_port_to_mux(port));
1761 ctrl_req->wLength = cpu_to_le16(size);
1762
1763 if (type == USB_CDC_GET_ENCAPSULATED_RESPONSE) {
1764 /* Reading command */
1765 ctrl_req->bRequestType = USB_DIR_IN |
1766 USB_TYPE_OPTION_VENDOR |
1767 USB_RECIP_INTERFACE;
1768 ctrl_req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
1769 pipe = usb_rcvctrlpipe(serial->parent->usb, 0);
1770 } else {
1771 /* Writing command */
1772 ctrl_req->bRequestType = USB_DIR_OUT |
1773 USB_TYPE_OPTION_VENDOR |
1774 USB_RECIP_INTERFACE;
1775 ctrl_req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
1776 pipe = usb_sndctrlpipe(serial->parent->usb, 0);
1777 }
1778 /* syslog */
1779 hso_dbg(0x2, "%s command (%02x) len: %d, port: %d\n",
1780 type == USB_CDC_GET_ENCAPSULATED_RESPONSE ? "Read" : "Write",
1781 ctrl_req->bRequestType, ctrl_req->wLength, port);
1782
1783 /* Load ctrl urb */
1784 ctrl_urb->transfer_flags = 0;
1785 usb_fill_control_urb(ctrl_urb,
1786 serial->parent->usb,
1787 pipe,
1788 (u8 *) ctrl_req,
1789 ctrl_urb_data, size, ctrl_callback, serial);
1790 /* Send it on merry way */
1791 result = usb_submit_urb(ctrl_urb, GFP_ATOMIC);
1792 if (result) {
1793 dev_err(&ctrl_urb->dev->dev,
1794 "%s failed submit ctrl_urb %d type %d\n", __func__,
1795 result, type);
1796 return result;
1797 }
1798
1799 /* done */
1800 return size;
1801 }
1802
1803 /* called by intr_callback when read occurs */
hso_mux_serial_read(struct hso_serial * serial)1804 static int hso_mux_serial_read(struct hso_serial *serial)
1805 {
1806 if (!serial)
1807 return -EINVAL;
1808
1809 /* clean data */
1810 memset(serial->rx_data[0], 0, CTRL_URB_RX_SIZE);
1811 /* make the request */
1812
1813 if (serial->num_rx_urbs != 1) {
1814 dev_err(&serial->parent->interface->dev,
1815 "ERROR: mux'd reads with multiple buffers "
1816 "not possible\n");
1817 return 0;
1818 }
1819 return mux_device_request(serial,
1820 USB_CDC_GET_ENCAPSULATED_RESPONSE,
1821 serial->parent->port_spec & HSO_PORT_MASK,
1822 serial->rx_urb[0],
1823 &serial->ctrl_req_rx,
1824 serial->rx_data[0], serial->rx_data_length);
1825 }
1826
1827 /* used for muxed serial port callback (muxed serial read) */
intr_callback(struct urb * urb)1828 static void intr_callback(struct urb *urb)
1829 {
1830 struct hso_shared_int *shared_int = urb->context;
1831 struct hso_serial *serial;
1832 unsigned char *port_req;
1833 int status = urb->status;
1834 unsigned long flags;
1835 int i;
1836
1837 usb_mark_last_busy(urb->dev);
1838
1839 /* sanity check */
1840 if (!shared_int)
1841 return;
1842
1843 /* status check */
1844 if (status) {
1845 handle_usb_error(status, __func__, NULL);
1846 return;
1847 }
1848 hso_dbg(0x8, "--- Got intr callback 0x%02X ---\n", status);
1849
1850 /* what request? */
1851 port_req = urb->transfer_buffer;
1852 hso_dbg(0x8, "port_req = 0x%.2X\n", *port_req);
1853 /* loop over all muxed ports to find the one sending this */
1854 for (i = 0; i < 8; i++) {
1855 /* max 8 channels on MUX */
1856 if (*port_req & (1 << i)) {
1857 serial = get_serial_by_shared_int_and_type(shared_int,
1858 (1 << i));
1859 if (serial != NULL) {
1860 hso_dbg(0x1, "Pending read interrupt on port %d\n",
1861 i);
1862 spin_lock_irqsave(&serial->serial_lock, flags);
1863 if (serial->rx_state == RX_IDLE &&
1864 serial->port.count > 0) {
1865 /* Setup and send a ctrl req read on
1866 * port i */
1867 if (!serial->rx_urb_filled[0]) {
1868 serial->rx_state = RX_SENT;
1869 hso_mux_serial_read(serial);
1870 } else
1871 serial->rx_state = RX_PENDING;
1872 } else {
1873 hso_dbg(0x1, "Already a read pending on port %d or port not open\n",
1874 i);
1875 }
1876 spin_unlock_irqrestore(&serial->serial_lock,
1877 flags);
1878 }
1879 }
1880 }
1881 /* Resubmit interrupt urb */
1882 hso_mux_submit_intr_urb(shared_int, urb->dev, GFP_ATOMIC);
1883 }
1884
1885 /* called for writing to muxed serial port */
hso_mux_serial_write_data(struct hso_serial * serial)1886 static int hso_mux_serial_write_data(struct hso_serial *serial)
1887 {
1888 if (NULL == serial)
1889 return -EINVAL;
1890
1891 return mux_device_request(serial,
1892 USB_CDC_SEND_ENCAPSULATED_COMMAND,
1893 serial->parent->port_spec & HSO_PORT_MASK,
1894 serial->tx_urb,
1895 &serial->ctrl_req_tx,
1896 serial->tx_data, serial->tx_data_count);
1897 }
1898
1899 /* write callback for Diag and CS port */
hso_std_serial_write_bulk_callback(struct urb * urb)1900 static void hso_std_serial_write_bulk_callback(struct urb *urb)
1901 {
1902 struct hso_serial *serial = urb->context;
1903 int status = urb->status;
1904 unsigned long flags;
1905
1906 /* sanity check */
1907 if (!serial) {
1908 hso_dbg(0x1, "serial == NULL\n");
1909 return;
1910 }
1911
1912 spin_lock_irqsave(&serial->serial_lock, flags);
1913 serial->tx_urb_used = 0;
1914 spin_unlock_irqrestore(&serial->serial_lock, flags);
1915 if (status) {
1916 handle_usb_error(status, __func__, serial->parent);
1917 return;
1918 }
1919 hso_put_activity(serial->parent);
1920 tty_port_tty_wakeup(&serial->port);
1921 hso_kick_transmit(serial);
1922
1923 hso_dbg(0x1, "\n");
1924 }
1925
1926 /* called for writing diag or CS serial port */
hso_std_serial_write_data(struct hso_serial * serial)1927 static int hso_std_serial_write_data(struct hso_serial *serial)
1928 {
1929 int count = serial->tx_data_count;
1930 int result;
1931
1932 usb_fill_bulk_urb(serial->tx_urb,
1933 serial->parent->usb,
1934 usb_sndbulkpipe(serial->parent->usb,
1935 serial->out_endp->
1936 bEndpointAddress & 0x7F),
1937 serial->tx_data, serial->tx_data_count,
1938 hso_std_serial_write_bulk_callback, serial);
1939
1940 result = usb_submit_urb(serial->tx_urb, GFP_ATOMIC);
1941 if (result) {
1942 dev_warn(&serial->parent->usb->dev,
1943 "Failed to submit urb - res %d\n", result);
1944 return result;
1945 }
1946
1947 return count;
1948 }
1949
1950 /* callback after read or write on muxed serial port */
ctrl_callback(struct urb * urb)1951 static void ctrl_callback(struct urb *urb)
1952 {
1953 struct hso_serial *serial = urb->context;
1954 struct usb_ctrlrequest *req;
1955 int status = urb->status;
1956 unsigned long flags;
1957
1958 /* sanity check */
1959 if (!serial)
1960 return;
1961
1962 spin_lock_irqsave(&serial->serial_lock, flags);
1963 serial->tx_urb_used = 0;
1964 spin_unlock_irqrestore(&serial->serial_lock, flags);
1965 if (status) {
1966 handle_usb_error(status, __func__, serial->parent);
1967 return;
1968 }
1969
1970 /* what request? */
1971 req = (struct usb_ctrlrequest *)(urb->setup_packet);
1972 hso_dbg(0x8, "--- Got muxed ctrl callback 0x%02X ---\n", status);
1973 hso_dbg(0x8, "Actual length of urb = %d\n", urb->actual_length);
1974 DUMP1(urb->transfer_buffer, urb->actual_length);
1975
1976 if (req->bRequestType ==
1977 (USB_DIR_IN | USB_TYPE_OPTION_VENDOR | USB_RECIP_INTERFACE)) {
1978 /* response to a read command */
1979 serial->rx_urb_filled[0] = 1;
1980 spin_lock_irqsave(&serial->serial_lock, flags);
1981 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1982 spin_unlock_irqrestore(&serial->serial_lock, flags);
1983 } else {
1984 hso_put_activity(serial->parent);
1985 tty_port_tty_wakeup(&serial->port);
1986 /* response to a write command */
1987 hso_kick_transmit(serial);
1988 }
1989 }
1990
1991 /* handle RX data for serial port */
put_rxbuf_data(struct urb * urb,struct hso_serial * serial)1992 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
1993 {
1994 struct tty_struct *tty;
1995 int count;
1996
1997 /* Sanity check */
1998 if (urb == NULL || serial == NULL) {
1999 hso_dbg(0x1, "serial = NULL\n");
2000 return -2;
2001 }
2002
2003 tty = tty_port_tty_get(&serial->port);
2004
2005 if (tty && tty_throttled(tty)) {
2006 tty_kref_put(tty);
2007 return -1;
2008 }
2009
2010 /* Push data to tty */
2011 hso_dbg(0x1, "data to push to tty\n");
2012 count = tty_buffer_request_room(&serial->port, urb->actual_length);
2013 if (count >= urb->actual_length) {
2014 tty_insert_flip_string(&serial->port, urb->transfer_buffer,
2015 urb->actual_length);
2016 tty_flip_buffer_push(&serial->port);
2017 } else {
2018 dev_warn(&serial->parent->usb->dev,
2019 "dropping data, %d bytes lost\n", urb->actual_length);
2020 }
2021
2022 tty_kref_put(tty);
2023
2024 serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0;
2025
2026 return 0;
2027 }
2028
2029
2030 /* Base driver functions */
2031
hso_log_port(struct hso_device * hso_dev)2032 static void hso_log_port(struct hso_device *hso_dev)
2033 {
2034 char *port_type;
2035 char port_dev[20];
2036
2037 switch (hso_dev->port_spec & HSO_PORT_MASK) {
2038 case HSO_PORT_CONTROL:
2039 port_type = "Control";
2040 break;
2041 case HSO_PORT_APP:
2042 port_type = "Application";
2043 break;
2044 case HSO_PORT_GPS:
2045 port_type = "GPS";
2046 break;
2047 case HSO_PORT_GPS_CONTROL:
2048 port_type = "GPS control";
2049 break;
2050 case HSO_PORT_APP2:
2051 port_type = "Application2";
2052 break;
2053 case HSO_PORT_PCSC:
2054 port_type = "PCSC";
2055 break;
2056 case HSO_PORT_DIAG:
2057 port_type = "Diagnostic";
2058 break;
2059 case HSO_PORT_DIAG2:
2060 port_type = "Diagnostic2";
2061 break;
2062 case HSO_PORT_MODEM:
2063 port_type = "Modem";
2064 break;
2065 case HSO_PORT_NETWORK:
2066 port_type = "Network";
2067 break;
2068 default:
2069 port_type = "Unknown";
2070 break;
2071 }
2072 if ((hso_dev->port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2073 sprintf(port_dev, "%s", dev2net(hso_dev)->net->name);
2074 } else
2075 sprintf(port_dev, "/dev/%s%d", tty_filename,
2076 dev2ser(hso_dev)->minor);
2077
2078 dev_dbg(&hso_dev->interface->dev, "HSO: Found %s port %s\n",
2079 port_type, port_dev);
2080 }
2081
hso_start_net_device(struct hso_device * hso_dev)2082 static int hso_start_net_device(struct hso_device *hso_dev)
2083 {
2084 int i, result = 0;
2085 struct hso_net *hso_net = dev2net(hso_dev);
2086
2087 if (!hso_net)
2088 return -ENODEV;
2089
2090 /* send URBs for all read buffers */
2091 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2092
2093 /* Prep a receive URB */
2094 usb_fill_bulk_urb(hso_net->mux_bulk_rx_urb_pool[i],
2095 hso_dev->usb,
2096 usb_rcvbulkpipe(hso_dev->usb,
2097 hso_net->in_endp->
2098 bEndpointAddress & 0x7F),
2099 hso_net->mux_bulk_rx_buf_pool[i],
2100 MUX_BULK_RX_BUF_SIZE, read_bulk_callback,
2101 hso_net);
2102
2103 /* Put it out there so the device can send us stuff */
2104 result = usb_submit_urb(hso_net->mux_bulk_rx_urb_pool[i],
2105 GFP_NOIO);
2106 if (result)
2107 dev_warn(&hso_dev->usb->dev,
2108 "%s failed mux_bulk_rx_urb[%d] %d\n", __func__,
2109 i, result);
2110 }
2111
2112 return result;
2113 }
2114
hso_stop_net_device(struct hso_device * hso_dev)2115 static int hso_stop_net_device(struct hso_device *hso_dev)
2116 {
2117 int i;
2118 struct hso_net *hso_net = dev2net(hso_dev);
2119
2120 if (!hso_net)
2121 return -ENODEV;
2122
2123 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2124 if (hso_net->mux_bulk_rx_urb_pool[i])
2125 usb_kill_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2126
2127 }
2128 if (hso_net->mux_bulk_tx_urb)
2129 usb_kill_urb(hso_net->mux_bulk_tx_urb);
2130
2131 return 0;
2132 }
2133
hso_start_serial_device(struct hso_device * hso_dev,gfp_t flags)2134 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags)
2135 {
2136 int i, result = 0;
2137 struct hso_serial *serial = dev2ser(hso_dev);
2138
2139 if (!serial)
2140 return -ENODEV;
2141
2142 /* If it is not the MUX port fill in and submit a bulk urb (already
2143 * allocated in hso_serial_start) */
2144 if (!(serial->parent->port_spec & HSO_INTF_MUX)) {
2145 for (i = 0; i < serial->num_rx_urbs; i++) {
2146 usb_fill_bulk_urb(serial->rx_urb[i],
2147 serial->parent->usb,
2148 usb_rcvbulkpipe(serial->parent->usb,
2149 serial->in_endp->
2150 bEndpointAddress &
2151 0x7F),
2152 serial->rx_data[i],
2153 serial->rx_data_length,
2154 hso_std_serial_read_bulk_callback,
2155 serial);
2156 result = usb_submit_urb(serial->rx_urb[i], flags);
2157 if (result) {
2158 dev_warn(&serial->parent->usb->dev,
2159 "Failed to submit urb - res %d\n",
2160 result);
2161 break;
2162 }
2163 }
2164 } else {
2165 mutex_lock(&serial->shared_int->shared_int_lock);
2166 if (!serial->shared_int->use_count) {
2167 result =
2168 hso_mux_submit_intr_urb(serial->shared_int,
2169 hso_dev->usb, flags);
2170 }
2171 serial->shared_int->use_count++;
2172 mutex_unlock(&serial->shared_int->shared_int_lock);
2173 }
2174 if (serial->tiocmget)
2175 tiocmget_submit_urb(serial,
2176 serial->tiocmget,
2177 serial->parent->usb);
2178 return result;
2179 }
2180
hso_stop_serial_device(struct hso_device * hso_dev)2181 static int hso_stop_serial_device(struct hso_device *hso_dev)
2182 {
2183 int i;
2184 struct hso_serial *serial = dev2ser(hso_dev);
2185 struct hso_tiocmget *tiocmget;
2186
2187 if (!serial)
2188 return -ENODEV;
2189
2190 for (i = 0; i < serial->num_rx_urbs; i++) {
2191 if (serial->rx_urb[i]) {
2192 usb_kill_urb(serial->rx_urb[i]);
2193 serial->rx_urb_filled[i] = 0;
2194 }
2195 }
2196 serial->curr_rx_urb_idx = 0;
2197
2198 if (serial->tx_urb)
2199 usb_kill_urb(serial->tx_urb);
2200
2201 if (serial->shared_int) {
2202 mutex_lock(&serial->shared_int->shared_int_lock);
2203 if (serial->shared_int->use_count &&
2204 (--serial->shared_int->use_count == 0)) {
2205 struct urb *urb;
2206
2207 urb = serial->shared_int->shared_intr_urb;
2208 if (urb)
2209 usb_kill_urb(urb);
2210 }
2211 mutex_unlock(&serial->shared_int->shared_int_lock);
2212 }
2213 tiocmget = serial->tiocmget;
2214 if (tiocmget) {
2215 wake_up_interruptible(&tiocmget->waitq);
2216 usb_kill_urb(tiocmget->urb);
2217 }
2218
2219 return 0;
2220 }
2221
hso_serial_tty_unregister(struct hso_serial * serial)2222 static void hso_serial_tty_unregister(struct hso_serial *serial)
2223 {
2224 tty_unregister_device(tty_drv, serial->minor);
2225 release_minor(serial);
2226 }
2227
hso_serial_common_free(struct hso_serial * serial)2228 static void hso_serial_common_free(struct hso_serial *serial)
2229 {
2230 int i;
2231
2232 for (i = 0; i < serial->num_rx_urbs; i++) {
2233 /* unlink and free RX URB */
2234 usb_free_urb(serial->rx_urb[i]);
2235 /* free the RX buffer */
2236 kfree(serial->rx_data[i]);
2237 }
2238
2239 /* unlink and free TX URB */
2240 usb_free_urb(serial->tx_urb);
2241 kfree(serial->tx_buffer);
2242 kfree(serial->tx_data);
2243 tty_port_destroy(&serial->port);
2244 }
2245
hso_serial_common_create(struct hso_serial * serial,int num_urbs,int rx_size,int tx_size)2246 static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
2247 int rx_size, int tx_size)
2248 {
2249 int i;
2250
2251 tty_port_init(&serial->port);
2252
2253 if (obtain_minor(serial))
2254 goto exit2;
2255
2256 /* register our minor number */
2257 serial->parent->dev = tty_port_register_device_attr(&serial->port,
2258 tty_drv, serial->minor, &serial->parent->interface->dev,
2259 serial->parent, hso_serial_dev_groups);
2260 if (IS_ERR(serial->parent->dev)) {
2261 release_minor(serial);
2262 goto exit2;
2263 }
2264
2265 serial->magic = HSO_SERIAL_MAGIC;
2266 spin_lock_init(&serial->serial_lock);
2267 serial->num_rx_urbs = num_urbs;
2268
2269 /* RX, allocate urb and initialize */
2270
2271 /* prepare our RX buffer */
2272 serial->rx_data_length = rx_size;
2273 for (i = 0; i < serial->num_rx_urbs; i++) {
2274 serial->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
2275 if (!serial->rx_urb[i])
2276 goto exit;
2277 serial->rx_urb[i]->transfer_buffer = NULL;
2278 serial->rx_urb[i]->transfer_buffer_length = 0;
2279 serial->rx_data[i] = kzalloc(serial->rx_data_length,
2280 GFP_KERNEL);
2281 if (!serial->rx_data[i])
2282 goto exit;
2283 }
2284
2285 /* TX, allocate urb and initialize */
2286 serial->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2287 if (!serial->tx_urb)
2288 goto exit;
2289 serial->tx_urb->transfer_buffer = NULL;
2290 serial->tx_urb->transfer_buffer_length = 0;
2291 /* prepare our TX buffer */
2292 serial->tx_data_count = 0;
2293 serial->tx_buffer_count = 0;
2294 serial->tx_data_length = tx_size;
2295 serial->tx_data = kzalloc(serial->tx_data_length, GFP_KERNEL);
2296 if (!serial->tx_data)
2297 goto exit;
2298
2299 serial->tx_buffer = kzalloc(serial->tx_data_length, GFP_KERNEL);
2300 if (!serial->tx_buffer)
2301 goto exit;
2302
2303 return 0;
2304 exit:
2305 hso_serial_tty_unregister(serial);
2306 exit2:
2307 hso_serial_common_free(serial);
2308 return -1;
2309 }
2310
2311 /* Creates a general hso device */
hso_create_device(struct usb_interface * intf,int port_spec)2312 static struct hso_device *hso_create_device(struct usb_interface *intf,
2313 int port_spec)
2314 {
2315 struct hso_device *hso_dev;
2316
2317 hso_dev = kzalloc(sizeof(*hso_dev), GFP_KERNEL);
2318 if (!hso_dev)
2319 return NULL;
2320
2321 hso_dev->port_spec = port_spec;
2322 hso_dev->usb = interface_to_usbdev(intf);
2323 hso_dev->interface = intf;
2324 kref_init(&hso_dev->ref);
2325 mutex_init(&hso_dev->mutex);
2326
2327 INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
2328 INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
2329
2330 return hso_dev;
2331 }
2332
2333 /* Removes a network device in the network device table */
remove_net_device(struct hso_device * hso_dev)2334 static int remove_net_device(struct hso_device *hso_dev)
2335 {
2336 int i;
2337
2338 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2339 if (network_table[i] == hso_dev) {
2340 network_table[i] = NULL;
2341 break;
2342 }
2343 }
2344 if (i == HSO_MAX_NET_DEVICES)
2345 return -1;
2346 return 0;
2347 }
2348
2349 /* Frees our network device */
hso_free_net_device(struct hso_device * hso_dev)2350 static void hso_free_net_device(struct hso_device *hso_dev)
2351 {
2352 int i;
2353 struct hso_net *hso_net = dev2net(hso_dev);
2354
2355 if (!hso_net)
2356 return;
2357
2358 remove_net_device(hso_net->parent);
2359
2360 if (hso_net->net)
2361 unregister_netdev(hso_net->net);
2362
2363 /* start freeing */
2364 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2365 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2366 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2367 hso_net->mux_bulk_rx_buf_pool[i] = NULL;
2368 }
2369 usb_free_urb(hso_net->mux_bulk_tx_urb);
2370 kfree(hso_net->mux_bulk_tx_buf);
2371 hso_net->mux_bulk_tx_buf = NULL;
2372
2373 if (hso_net->net)
2374 free_netdev(hso_net->net);
2375
2376 kfree(hso_dev);
2377 }
2378
2379 static const struct net_device_ops hso_netdev_ops = {
2380 .ndo_open = hso_net_open,
2381 .ndo_stop = hso_net_close,
2382 .ndo_start_xmit = hso_net_start_xmit,
2383 .ndo_tx_timeout = hso_net_tx_timeout,
2384 };
2385
2386 /* initialize the network interface */
hso_net_init(struct net_device * net)2387 static void hso_net_init(struct net_device *net)
2388 {
2389 struct hso_net *hso_net = netdev_priv(net);
2390
2391 hso_dbg(0x1, "sizeof hso_net is %zu\n", sizeof(*hso_net));
2392
2393 /* fill in the other fields */
2394 net->netdev_ops = &hso_netdev_ops;
2395 net->watchdog_timeo = HSO_NET_TX_TIMEOUT;
2396 net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2397 net->type = ARPHRD_NONE;
2398 net->mtu = DEFAULT_MTU - 14;
2399 net->tx_queue_len = 10;
2400 net->ethtool_ops = &ops;
2401
2402 /* and initialize the semaphore */
2403 spin_lock_init(&hso_net->net_lock);
2404 }
2405
2406 /* Adds a network device in the network device table */
add_net_device(struct hso_device * hso_dev)2407 static int add_net_device(struct hso_device *hso_dev)
2408 {
2409 int i;
2410
2411 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2412 if (network_table[i] == NULL) {
2413 network_table[i] = hso_dev;
2414 break;
2415 }
2416 }
2417 if (i == HSO_MAX_NET_DEVICES)
2418 return -1;
2419 return 0;
2420 }
2421
hso_rfkill_set_block(void * data,bool blocked)2422 static int hso_rfkill_set_block(void *data, bool blocked)
2423 {
2424 struct hso_device *hso_dev = data;
2425 int enabled = !blocked;
2426 int rv;
2427
2428 mutex_lock(&hso_dev->mutex);
2429 if (hso_dev->usb_gone)
2430 rv = 0;
2431 else
2432 rv = usb_control_msg(hso_dev->usb, usb_sndctrlpipe(hso_dev->usb, 0),
2433 enabled ? 0x82 : 0x81, 0x40, 0, 0, NULL, 0,
2434 USB_CTRL_SET_TIMEOUT);
2435 mutex_unlock(&hso_dev->mutex);
2436 return rv;
2437 }
2438
2439 static const struct rfkill_ops hso_rfkill_ops = {
2440 .set_block = hso_rfkill_set_block,
2441 };
2442
2443 /* Creates and sets up everything for rfkill */
hso_create_rfkill(struct hso_device * hso_dev,struct usb_interface * interface)2444 static void hso_create_rfkill(struct hso_device *hso_dev,
2445 struct usb_interface *interface)
2446 {
2447 struct hso_net *hso_net = dev2net(hso_dev);
2448 struct device *dev = &hso_net->net->dev;
2449 static u32 rfkill_counter;
2450
2451 snprintf(hso_net->name, sizeof(hso_net->name), "hso-%d",
2452 rfkill_counter++);
2453
2454 hso_net->rfkill = rfkill_alloc(hso_net->name,
2455 &interface_to_usbdev(interface)->dev,
2456 RFKILL_TYPE_WWAN,
2457 &hso_rfkill_ops, hso_dev);
2458 if (!hso_net->rfkill)
2459 return;
2460
2461 if (rfkill_register(hso_net->rfkill) < 0) {
2462 rfkill_destroy(hso_net->rfkill);
2463 hso_net->rfkill = NULL;
2464 dev_err(dev, "%s - Failed to register rfkill\n", __func__);
2465 return;
2466 }
2467 }
2468
2469 static struct device_type hso_type = {
2470 .name = "wwan",
2471 };
2472
2473 /* Creates our network device */
hso_create_net_device(struct usb_interface * interface,int port_spec)2474 static struct hso_device *hso_create_net_device(struct usb_interface *interface,
2475 int port_spec)
2476 {
2477 int result, i;
2478 struct net_device *net;
2479 struct hso_net *hso_net;
2480 struct hso_device *hso_dev;
2481
2482 hso_dev = hso_create_device(interface, port_spec);
2483 if (!hso_dev)
2484 return NULL;
2485
2486 /* allocate our network device, then we can put in our private data */
2487 /* call hso_net_init to do the basic initialization */
2488 net = alloc_netdev(sizeof(struct hso_net), "hso%d", NET_NAME_UNKNOWN,
2489 hso_net_init);
2490 if (!net) {
2491 dev_err(&interface->dev, "Unable to create ethernet device\n");
2492 goto err_hso_dev;
2493 }
2494
2495 hso_net = netdev_priv(net);
2496
2497 hso_dev->port_data.dev_net = hso_net;
2498 hso_net->net = net;
2499 hso_net->parent = hso_dev;
2500
2501 hso_net->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2502 USB_DIR_IN);
2503 if (!hso_net->in_endp) {
2504 dev_err(&interface->dev, "Can't find BULK IN endpoint\n");
2505 goto err_net;
2506 }
2507 hso_net->out_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2508 USB_DIR_OUT);
2509 if (!hso_net->out_endp) {
2510 dev_err(&interface->dev, "Can't find BULK OUT endpoint\n");
2511 goto err_net;
2512 }
2513 SET_NETDEV_DEV(net, &interface->dev);
2514 SET_NETDEV_DEVTYPE(net, &hso_type);
2515
2516 /* start allocating */
2517 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2518 hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
2519 if (!hso_net->mux_bulk_rx_urb_pool[i])
2520 goto err_mux_bulk_rx;
2521 hso_net->mux_bulk_rx_buf_pool[i] = kzalloc(MUX_BULK_RX_BUF_SIZE,
2522 GFP_KERNEL);
2523 if (!hso_net->mux_bulk_rx_buf_pool[i])
2524 goto err_mux_bulk_rx;
2525 }
2526 hso_net->mux_bulk_tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2527 if (!hso_net->mux_bulk_tx_urb)
2528 goto err_mux_bulk_rx;
2529 hso_net->mux_bulk_tx_buf = kzalloc(MUX_BULK_TX_BUF_SIZE, GFP_KERNEL);
2530 if (!hso_net->mux_bulk_tx_buf)
2531 goto err_free_tx_urb;
2532
2533 result = add_net_device(hso_dev);
2534 if (result) {
2535 dev_err(&interface->dev, "Failed to add net device\n");
2536 goto err_free_tx_buf;
2537 }
2538
2539 /* registering our net device */
2540 result = register_netdev(net);
2541 if (result) {
2542 dev_err(&interface->dev, "Failed to register device\n");
2543 goto err_rmv_ndev;
2544 }
2545
2546 hso_log_port(hso_dev);
2547
2548 hso_create_rfkill(hso_dev, interface);
2549
2550 return hso_dev;
2551
2552 err_rmv_ndev:
2553 remove_net_device(hso_dev);
2554 err_free_tx_buf:
2555 kfree(hso_net->mux_bulk_tx_buf);
2556 err_free_tx_urb:
2557 usb_free_urb(hso_net->mux_bulk_tx_urb);
2558 err_mux_bulk_rx:
2559 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2560 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2561 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2562 }
2563 err_net:
2564 free_netdev(net);
2565 err_hso_dev:
2566 kfree(hso_dev);
2567 return NULL;
2568 }
2569
hso_free_tiomget(struct hso_serial * serial)2570 static void hso_free_tiomget(struct hso_serial *serial)
2571 {
2572 struct hso_tiocmget *tiocmget;
2573 if (!serial)
2574 return;
2575 tiocmget = serial->tiocmget;
2576 if (tiocmget) {
2577 usb_free_urb(tiocmget->urb);
2578 tiocmget->urb = NULL;
2579 serial->tiocmget = NULL;
2580 kfree(tiocmget->serial_state_notification);
2581 tiocmget->serial_state_notification = NULL;
2582 kfree(tiocmget);
2583 }
2584 }
2585
2586 /* Frees an AT channel ( goes for both mux and non-mux ) */
hso_free_serial_device(struct hso_device * hso_dev)2587 static void hso_free_serial_device(struct hso_device *hso_dev)
2588 {
2589 struct hso_serial *serial = dev2ser(hso_dev);
2590
2591 if (!serial)
2592 return;
2593
2594 hso_serial_common_free(serial);
2595
2596 if (serial->shared_int) {
2597 mutex_lock(&serial->shared_int->shared_int_lock);
2598 if (--serial->shared_int->ref_count == 0)
2599 hso_free_shared_int(serial->shared_int);
2600 else
2601 mutex_unlock(&serial->shared_int->shared_int_lock);
2602 }
2603 hso_free_tiomget(serial);
2604 kfree(serial);
2605 kfree(hso_dev);
2606 }
2607
2608 /* Creates a bulk AT channel */
hso_create_bulk_serial_device(struct usb_interface * interface,int port)2609 static struct hso_device *hso_create_bulk_serial_device(
2610 struct usb_interface *interface, int port)
2611 {
2612 struct hso_device *hso_dev;
2613 struct hso_serial *serial;
2614 int num_urbs;
2615 struct hso_tiocmget *tiocmget;
2616
2617 hso_dev = hso_create_device(interface, port);
2618 if (!hso_dev)
2619 return NULL;
2620
2621 serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2622 if (!serial)
2623 goto exit;
2624
2625 serial->parent = hso_dev;
2626 hso_dev->port_data.dev_serial = serial;
2627
2628 if ((port & HSO_PORT_MASK) == HSO_PORT_MODEM) {
2629 num_urbs = 2;
2630 serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget),
2631 GFP_KERNEL);
2632 if (!serial->tiocmget)
2633 goto exit;
2634 serial->tiocmget->serial_state_notification
2635 = kzalloc(sizeof(struct hso_serial_state_notification),
2636 GFP_KERNEL);
2637 if (!serial->tiocmget->serial_state_notification)
2638 goto exit;
2639 tiocmget = serial->tiocmget;
2640 tiocmget->endp = hso_get_ep(interface,
2641 USB_ENDPOINT_XFER_INT,
2642 USB_DIR_IN);
2643 if (!tiocmget->endp) {
2644 dev_err(&interface->dev, "Failed to find INT IN ep\n");
2645 goto exit;
2646 }
2647
2648 tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
2649 if (!tiocmget->urb)
2650 goto exit;
2651
2652 mutex_init(&tiocmget->mutex);
2653 init_waitqueue_head(&tiocmget->waitq);
2654 } else {
2655 num_urbs = 1;
2656 }
2657
2658 if (hso_serial_common_create(serial, num_urbs, BULK_URB_RX_SIZE,
2659 BULK_URB_TX_SIZE))
2660 goto exit;
2661
2662 serial->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2663 USB_DIR_IN);
2664 if (!serial->in_endp) {
2665 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2666 goto exit2;
2667 }
2668
2669 if (!
2670 (serial->out_endp =
2671 hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT))) {
2672 dev_err(&interface->dev, "Failed to find BULK OUT ep\n");
2673 goto exit2;
2674 }
2675
2676 serial->write_data = hso_std_serial_write_data;
2677
2678 /* setup the proc dirs and files if needed */
2679 hso_log_port(hso_dev);
2680
2681 /* done, return it */
2682 return hso_dev;
2683
2684 exit2:
2685 hso_serial_tty_unregister(serial);
2686 hso_serial_common_free(serial);
2687 exit:
2688 hso_free_tiomget(serial);
2689 kfree(serial);
2690 kfree(hso_dev);
2691 return NULL;
2692 }
2693
2694 /* Creates a multiplexed AT channel */
2695 static
hso_create_mux_serial_device(struct usb_interface * interface,int port,struct hso_shared_int * mux)2696 struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface,
2697 int port,
2698 struct hso_shared_int *mux)
2699 {
2700 struct hso_device *hso_dev;
2701 struct hso_serial *serial;
2702 int port_spec;
2703
2704 port_spec = HSO_INTF_MUX;
2705 port_spec &= ~HSO_PORT_MASK;
2706
2707 port_spec |= hso_mux_to_port(port);
2708 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NO_PORT)
2709 return NULL;
2710
2711 hso_dev = hso_create_device(interface, port_spec);
2712 if (!hso_dev)
2713 return NULL;
2714
2715 serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2716 if (!serial)
2717 goto err_free_dev;
2718
2719 hso_dev->port_data.dev_serial = serial;
2720 serial->parent = hso_dev;
2721
2722 if (hso_serial_common_create
2723 (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE))
2724 goto err_free_serial;
2725
2726 serial->tx_data_length--;
2727 serial->write_data = hso_mux_serial_write_data;
2728
2729 serial->shared_int = mux;
2730 mutex_lock(&serial->shared_int->shared_int_lock);
2731 serial->shared_int->ref_count++;
2732 mutex_unlock(&serial->shared_int->shared_int_lock);
2733
2734 /* setup the proc dirs and files if needed */
2735 hso_log_port(hso_dev);
2736
2737 /* done, return it */
2738 return hso_dev;
2739
2740 err_free_serial:
2741 kfree(serial);
2742 err_free_dev:
2743 kfree(hso_dev);
2744 return NULL;
2745
2746 }
2747
hso_free_shared_int(struct hso_shared_int * mux)2748 static void hso_free_shared_int(struct hso_shared_int *mux)
2749 {
2750 usb_free_urb(mux->shared_intr_urb);
2751 kfree(mux->shared_intr_buf);
2752 mutex_unlock(&mux->shared_int_lock);
2753 kfree(mux);
2754 }
2755
2756 static
hso_create_shared_int(struct usb_interface * interface)2757 struct hso_shared_int *hso_create_shared_int(struct usb_interface *interface)
2758 {
2759 struct hso_shared_int *mux = kzalloc(sizeof(*mux), GFP_KERNEL);
2760
2761 if (!mux)
2762 return NULL;
2763
2764 mux->intr_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT,
2765 USB_DIR_IN);
2766 if (!mux->intr_endp) {
2767 dev_err(&interface->dev, "Can't find INT IN endpoint\n");
2768 goto exit;
2769 }
2770
2771 mux->shared_intr_urb = usb_alloc_urb(0, GFP_KERNEL);
2772 if (!mux->shared_intr_urb)
2773 goto exit;
2774 mux->shared_intr_buf =
2775 kzalloc(le16_to_cpu(mux->intr_endp->wMaxPacketSize),
2776 GFP_KERNEL);
2777 if (!mux->shared_intr_buf)
2778 goto exit;
2779
2780 mutex_init(&mux->shared_int_lock);
2781
2782 return mux;
2783
2784 exit:
2785 kfree(mux->shared_intr_buf);
2786 usb_free_urb(mux->shared_intr_urb);
2787 kfree(mux);
2788 return NULL;
2789 }
2790
2791 /* Gets the port spec for a certain interface */
hso_get_config_data(struct usb_interface * interface)2792 static int hso_get_config_data(struct usb_interface *interface)
2793 {
2794 struct usb_device *usbdev = interface_to_usbdev(interface);
2795 u8 *config_data = kmalloc(17, GFP_KERNEL);
2796 u32 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2797 s32 result;
2798
2799 if (!config_data)
2800 return -ENOMEM;
2801 if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
2802 0x86, 0xC0, 0, 0, config_data, 17,
2803 USB_CTRL_SET_TIMEOUT) != 0x11) {
2804 kfree(config_data);
2805 return -EIO;
2806 }
2807
2808 /* check if we have a valid interface */
2809 if (if_num > 16) {
2810 kfree(config_data);
2811 return -EINVAL;
2812 }
2813
2814 switch (config_data[if_num]) {
2815 case 0x0:
2816 result = 0;
2817 break;
2818 case 0x1:
2819 result = HSO_PORT_DIAG;
2820 break;
2821 case 0x2:
2822 result = HSO_PORT_GPS;
2823 break;
2824 case 0x3:
2825 result = HSO_PORT_GPS_CONTROL;
2826 break;
2827 case 0x4:
2828 result = HSO_PORT_APP;
2829 break;
2830 case 0x5:
2831 result = HSO_PORT_APP2;
2832 break;
2833 case 0x6:
2834 result = HSO_PORT_CONTROL;
2835 break;
2836 case 0x7:
2837 result = HSO_PORT_NETWORK;
2838 break;
2839 case 0x8:
2840 result = HSO_PORT_MODEM;
2841 break;
2842 case 0x9:
2843 result = HSO_PORT_MSD;
2844 break;
2845 case 0xa:
2846 result = HSO_PORT_PCSC;
2847 break;
2848 case 0xb:
2849 result = HSO_PORT_VOICE;
2850 break;
2851 default:
2852 result = 0;
2853 }
2854
2855 if (result)
2856 result |= HSO_INTF_BULK;
2857
2858 if (config_data[16] & 0x1)
2859 result |= HSO_INFO_CRC_BUG;
2860
2861 kfree(config_data);
2862 return result;
2863 }
2864
2865 /* called once for each interface upon device insertion */
hso_probe(struct usb_interface * interface,const struct usb_device_id * id)2866 static int hso_probe(struct usb_interface *interface,
2867 const struct usb_device_id *id)
2868 {
2869 int mux, i, if_num, port_spec;
2870 unsigned char port_mask;
2871 struct hso_device *hso_dev = NULL;
2872 struct hso_shared_int *shared_int;
2873 struct hso_device *tmp_dev = NULL;
2874
2875 if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
2876 dev_err(&interface->dev, "Not our interface\n");
2877 return -ENODEV;
2878 }
2879
2880 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2881
2882 /* Get the interface/port specification from either driver_info or from
2883 * the device itself */
2884 if (id->driver_info) {
2885 /* if_num is controlled by the device, driver_info is a 0 terminated
2886 * array. Make sure, the access is in bounds! */
2887 for (i = 0; i <= if_num; ++i)
2888 if (((u32 *)(id->driver_info))[i] == 0)
2889 goto exit;
2890 port_spec = ((u32 *)(id->driver_info))[if_num];
2891 } else {
2892 port_spec = hso_get_config_data(interface);
2893 if (port_spec < 0)
2894 goto exit;
2895 }
2896
2897 /* Check if we need to switch to alt interfaces prior to port
2898 * configuration */
2899 if (interface->num_altsetting > 1)
2900 usb_set_interface(interface_to_usbdev(interface), if_num, 1);
2901 interface->needs_remote_wakeup = 1;
2902
2903 /* Allocate new hso device(s) */
2904 switch (port_spec & HSO_INTF_MASK) {
2905 case HSO_INTF_MUX:
2906 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2907 /* Create the network device */
2908 if (!disable_net) {
2909 hso_dev = hso_create_net_device(interface,
2910 port_spec);
2911 if (!hso_dev)
2912 goto exit;
2913 tmp_dev = hso_dev;
2914 }
2915 }
2916
2917 if (hso_get_mux_ports(interface, &port_mask))
2918 /* TODO: de-allocate everything */
2919 goto exit;
2920
2921 shared_int = hso_create_shared_int(interface);
2922 if (!shared_int)
2923 goto exit;
2924
2925 for (i = 1, mux = 0; i < 0x100; i = i << 1, mux++) {
2926 if (port_mask & i) {
2927 hso_dev = hso_create_mux_serial_device(
2928 interface, i, shared_int);
2929 if (!hso_dev)
2930 goto exit;
2931 }
2932 }
2933
2934 if (tmp_dev)
2935 hso_dev = tmp_dev;
2936 break;
2937
2938 case HSO_INTF_BULK:
2939 /* It's a regular bulk interface */
2940 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2941 if (!disable_net)
2942 hso_dev =
2943 hso_create_net_device(interface, port_spec);
2944 } else {
2945 hso_dev =
2946 hso_create_bulk_serial_device(interface, port_spec);
2947 }
2948 if (!hso_dev)
2949 goto exit;
2950 break;
2951 default:
2952 goto exit;
2953 }
2954
2955 /* save our data pointer in this device */
2956 usb_set_intfdata(interface, hso_dev);
2957
2958 /* done */
2959 return 0;
2960 exit:
2961 hso_free_interface(interface);
2962 return -ENODEV;
2963 }
2964
2965 /* device removed, cleaning up */
hso_disconnect(struct usb_interface * interface)2966 static void hso_disconnect(struct usb_interface *interface)
2967 {
2968 hso_free_interface(interface);
2969
2970 /* remove reference of our private data */
2971 usb_set_intfdata(interface, NULL);
2972 }
2973
async_get_intf(struct work_struct * data)2974 static void async_get_intf(struct work_struct *data)
2975 {
2976 struct hso_device *hso_dev =
2977 container_of(data, struct hso_device, async_get_intf);
2978 usb_autopm_get_interface(hso_dev->interface);
2979 }
2980
async_put_intf(struct work_struct * data)2981 static void async_put_intf(struct work_struct *data)
2982 {
2983 struct hso_device *hso_dev =
2984 container_of(data, struct hso_device, async_put_intf);
2985 usb_autopm_put_interface(hso_dev->interface);
2986 }
2987
hso_get_activity(struct hso_device * hso_dev)2988 static int hso_get_activity(struct hso_device *hso_dev)
2989 {
2990 if (hso_dev->usb->state == USB_STATE_SUSPENDED) {
2991 if (!hso_dev->is_active) {
2992 hso_dev->is_active = 1;
2993 schedule_work(&hso_dev->async_get_intf);
2994 }
2995 }
2996
2997 if (hso_dev->usb->state != USB_STATE_CONFIGURED)
2998 return -EAGAIN;
2999
3000 usb_mark_last_busy(hso_dev->usb);
3001
3002 return 0;
3003 }
3004
hso_put_activity(struct hso_device * hso_dev)3005 static int hso_put_activity(struct hso_device *hso_dev)
3006 {
3007 if (hso_dev->usb->state != USB_STATE_SUSPENDED) {
3008 if (hso_dev->is_active) {
3009 hso_dev->is_active = 0;
3010 schedule_work(&hso_dev->async_put_intf);
3011 return -EAGAIN;
3012 }
3013 }
3014 hso_dev->is_active = 0;
3015 return 0;
3016 }
3017
3018 /* called by kernel when we need to suspend device */
hso_suspend(struct usb_interface * iface,pm_message_t message)3019 static int hso_suspend(struct usb_interface *iface, pm_message_t message)
3020 {
3021 int i, result;
3022
3023 /* Stop all serial ports */
3024 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3025 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3026 result = hso_stop_serial_device(serial_table[i]);
3027 if (result)
3028 goto out;
3029 }
3030 }
3031
3032 /* Stop all network ports */
3033 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3034 if (network_table[i] &&
3035 (network_table[i]->interface == iface)) {
3036 result = hso_stop_net_device(network_table[i]);
3037 if (result)
3038 goto out;
3039 }
3040 }
3041
3042 out:
3043 return 0;
3044 }
3045
3046 /* called by kernel when we need to resume device */
hso_resume(struct usb_interface * iface)3047 static int hso_resume(struct usb_interface *iface)
3048 {
3049 int i, result = 0;
3050 struct hso_net *hso_net;
3051
3052 /* Start all serial ports */
3053 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3054 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3055 if (dev2ser(serial_table[i])->port.count) {
3056 result =
3057 hso_start_serial_device(serial_table[i], GFP_NOIO);
3058 hso_kick_transmit(dev2ser(serial_table[i]));
3059 if (result)
3060 goto out;
3061 }
3062 }
3063 }
3064
3065 /* Start all network ports */
3066 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3067 if (network_table[i] &&
3068 (network_table[i]->interface == iface)) {
3069 hso_net = dev2net(network_table[i]);
3070 if (hso_net->flags & IFF_UP) {
3071 /* First transmit any lingering data,
3072 then restart the device. */
3073 if (hso_net->skb_tx_buf) {
3074 dev_dbg(&iface->dev,
3075 "Transmitting"
3076 " lingering data\n");
3077 hso_net_start_xmit(hso_net->skb_tx_buf,
3078 hso_net->net);
3079 hso_net->skb_tx_buf = NULL;
3080 }
3081 result = hso_start_net_device(network_table[i]);
3082 if (result)
3083 goto out;
3084 }
3085 }
3086 }
3087
3088 out:
3089 return result;
3090 }
3091
hso_serial_ref_free(struct kref * ref)3092 static void hso_serial_ref_free(struct kref *ref)
3093 {
3094 struct hso_device *hso_dev = container_of(ref, struct hso_device, ref);
3095
3096 hso_free_serial_device(hso_dev);
3097 }
3098
hso_free_interface(struct usb_interface * interface)3099 static void hso_free_interface(struct usb_interface *interface)
3100 {
3101 struct hso_serial *serial;
3102 int i;
3103
3104 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3105 if (serial_table[i] &&
3106 (serial_table[i]->interface == interface)) {
3107 serial = dev2ser(serial_table[i]);
3108 tty_port_tty_hangup(&serial->port, false);
3109 mutex_lock(&serial->parent->mutex);
3110 serial->parent->usb_gone = 1;
3111 mutex_unlock(&serial->parent->mutex);
3112 cancel_work_sync(&serial_table[i]->async_put_intf);
3113 cancel_work_sync(&serial_table[i]->async_get_intf);
3114 hso_serial_tty_unregister(serial);
3115 kref_put(&serial->parent->ref, hso_serial_ref_free);
3116 }
3117 }
3118
3119 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3120 if (network_table[i] &&
3121 (network_table[i]->interface == interface)) {
3122 struct rfkill *rfk = dev2net(network_table[i])->rfkill;
3123 /* hso_stop_net_device doesn't stop the net queue since
3124 * traffic needs to start it again when suspended */
3125 netif_stop_queue(dev2net(network_table[i])->net);
3126 hso_stop_net_device(network_table[i]);
3127 cancel_work_sync(&network_table[i]->async_put_intf);
3128 cancel_work_sync(&network_table[i]->async_get_intf);
3129 if (rfk) {
3130 rfkill_unregister(rfk);
3131 rfkill_destroy(rfk);
3132 }
3133 hso_free_net_device(network_table[i]);
3134 }
3135 }
3136 }
3137
3138 /* Helper functions */
3139
3140 /* Get the endpoint ! */
hso_get_ep(struct usb_interface * intf,int type,int dir)3141 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
3142 int type, int dir)
3143 {
3144 int i;
3145 struct usb_host_interface *iface = intf->cur_altsetting;
3146 struct usb_endpoint_descriptor *endp;
3147
3148 for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3149 endp = &iface->endpoint[i].desc;
3150 if (((endp->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == dir) &&
3151 (usb_endpoint_type(endp) == type))
3152 return endp;
3153 }
3154
3155 return NULL;
3156 }
3157
3158 /* Get the byte that describes which ports are enabled */
hso_get_mux_ports(struct usb_interface * intf,unsigned char * ports)3159 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports)
3160 {
3161 int i;
3162 struct usb_host_interface *iface = intf->cur_altsetting;
3163
3164 if (iface->extralen == 3) {
3165 *ports = iface->extra[2];
3166 return 0;
3167 }
3168
3169 for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3170 if (iface->endpoint[i].extralen == 3) {
3171 *ports = iface->endpoint[i].extra[2];
3172 return 0;
3173 }
3174 }
3175
3176 return -1;
3177 }
3178
3179 /* interrupt urb needs to be submitted, used for serial read of muxed port */
hso_mux_submit_intr_urb(struct hso_shared_int * shared_int,struct usb_device * usb,gfp_t gfp)3180 static int hso_mux_submit_intr_urb(struct hso_shared_int *shared_int,
3181 struct usb_device *usb, gfp_t gfp)
3182 {
3183 int result;
3184
3185 usb_fill_int_urb(shared_int->shared_intr_urb, usb,
3186 usb_rcvintpipe(usb,
3187 shared_int->intr_endp->bEndpointAddress & 0x7F),
3188 shared_int->shared_intr_buf,
3189 1,
3190 intr_callback, shared_int,
3191 shared_int->intr_endp->bInterval);
3192
3193 result = usb_submit_urb(shared_int->shared_intr_urb, gfp);
3194 if (result)
3195 dev_warn(&usb->dev, "%s failed mux_intr_urb %d\n", __func__,
3196 result);
3197
3198 return result;
3199 }
3200
3201 /* operations setup of the serial interface */
3202 static const struct tty_operations hso_serial_ops = {
3203 .open = hso_serial_open,
3204 .close = hso_serial_close,
3205 .write = hso_serial_write,
3206 .write_room = hso_serial_write_room,
3207 .cleanup = hso_serial_cleanup,
3208 .ioctl = hso_serial_ioctl,
3209 .set_termios = hso_serial_set_termios,
3210 .chars_in_buffer = hso_serial_chars_in_buffer,
3211 .tiocmget = hso_serial_tiocmget,
3212 .tiocmset = hso_serial_tiocmset,
3213 .get_icount = hso_get_count,
3214 .unthrottle = hso_unthrottle
3215 };
3216
3217 static struct usb_driver hso_driver = {
3218 .name = driver_name,
3219 .probe = hso_probe,
3220 .disconnect = hso_disconnect,
3221 .id_table = hso_ids,
3222 .suspend = hso_suspend,
3223 .resume = hso_resume,
3224 .reset_resume = hso_resume,
3225 .supports_autosuspend = 1,
3226 .disable_hub_initiated_lpm = 1,
3227 };
3228
hso_init(void)3229 static int __init hso_init(void)
3230 {
3231 int i;
3232 int result;
3233
3234 /* put it in the log */
3235 pr_info("%s\n", version);
3236
3237 /* Initialise the serial table semaphore and table */
3238 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++)
3239 serial_table[i] = NULL;
3240
3241 /* allocate our driver using the proper amount of supported minors */
3242 tty_drv = tty_alloc_driver(HSO_SERIAL_TTY_MINORS, TTY_DRIVER_REAL_RAW |
3243 TTY_DRIVER_DYNAMIC_DEV);
3244 if (IS_ERR(tty_drv))
3245 return PTR_ERR(tty_drv);
3246
3247 /* fill in all needed values */
3248 tty_drv->driver_name = driver_name;
3249 tty_drv->name = tty_filename;
3250
3251 /* if major number is provided as parameter, use that one */
3252 if (tty_major)
3253 tty_drv->major = tty_major;
3254
3255 tty_drv->minor_start = 0;
3256 tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
3257 tty_drv->subtype = SERIAL_TYPE_NORMAL;
3258 tty_drv->init_termios = tty_std_termios;
3259 hso_init_termios(&tty_drv->init_termios);
3260 tty_set_operations(tty_drv, &hso_serial_ops);
3261
3262 /* register the tty driver */
3263 result = tty_register_driver(tty_drv);
3264 if (result) {
3265 pr_err("%s - tty_register_driver failed(%d)\n",
3266 __func__, result);
3267 goto err_free_tty;
3268 }
3269
3270 /* register this module as an usb driver */
3271 result = usb_register(&hso_driver);
3272 if (result) {
3273 pr_err("Could not register hso driver - error: %d\n", result);
3274 goto err_unreg_tty;
3275 }
3276
3277 /* done */
3278 return 0;
3279 err_unreg_tty:
3280 tty_unregister_driver(tty_drv);
3281 err_free_tty:
3282 tty_driver_kref_put(tty_drv);
3283 return result;
3284 }
3285
hso_exit(void)3286 static void __exit hso_exit(void)
3287 {
3288 pr_info("unloaded\n");
3289
3290 tty_unregister_driver(tty_drv);
3291 /* deregister the usb driver */
3292 usb_deregister(&hso_driver);
3293 tty_driver_kref_put(tty_drv);
3294 }
3295
3296 /* Module definitions */
3297 module_init(hso_init);
3298 module_exit(hso_exit);
3299
3300 MODULE_AUTHOR(MOD_AUTHOR);
3301 MODULE_DESCRIPTION(MOD_DESCRIPTION);
3302 MODULE_LICENSE("GPL");
3303
3304 /* change the debug level (eg: insmod hso.ko debug=0x04) */
3305 MODULE_PARM_DESC(debug, "debug level mask [0x01 | 0x02 | 0x04 | 0x08 | 0x10]");
3306 module_param(debug, int, 0644);
3307
3308 /* set the major tty number (eg: insmod hso.ko tty_major=245) */
3309 MODULE_PARM_DESC(tty_major, "Set the major tty number");
3310 module_param(tty_major, int, 0644);
3311
3312 /* disable network interface (eg: insmod hso.ko disable_net=1) */
3313 MODULE_PARM_DESC(disable_net, "Disable the network interface");
3314 module_param(disable_net, int, 0644);
3315