1 /******************************************************************************
2 *
3 * Driver for Option High Speed Mobile Devices.
4 *
5 * Copyright (C) 2008 Option International
6 * Filip Aben <f.aben@option.com>
7 * Denis Joseph Barrow <d.barow@option.com>
8 * Jan Dumon <j.dumon@option.com>
9 * Copyright (C) 2007 Andrew Bird (Sphere Systems Ltd)
10 * <ajb@spheresystems.co.uk>
11 * Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
12 * Copyright (C) 2008 Novell, Inc.
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
26 * USA
27 *
28 *
29 *****************************************************************************/
30
31 /******************************************************************************
32 *
33 * Description of the device:
34 *
35 * Interface 0: Contains the IP network interface on the bulk end points.
36 * The multiplexed serial ports are using the interrupt and
37 * control endpoints.
38 * Interrupt contains a bitmap telling which multiplexed
39 * serialport needs servicing.
40 *
41 * Interface 1: Diagnostics port, uses bulk only, do not submit urbs until the
42 * port is opened, as this have a huge impact on the network port
43 * throughput.
44 *
45 * Interface 2: Standard modem interface - circuit switched interface, this
46 * can be used to make a standard ppp connection however it
47 * should not be used in conjunction with the IP network interface
48 * enabled for USB performance reasons i.e. if using this set
49 * ideally disable_net=1.
50 *
51 *****************************************************************************/
52
53 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
54
55 #include <linux/sched/signal.h>
56 #include <linux/slab.h>
57 #include <linux/init.h>
58 #include <linux/delay.h>
59 #include <linux/netdevice.h>
60 #include <linux/module.h>
61 #include <linux/ethtool.h>
62 #include <linux/usb.h>
63 #include <linux/tty.h>
64 #include <linux/tty_driver.h>
65 #include <linux/tty_flip.h>
66 #include <linux/kmod.h>
67 #include <linux/rfkill.h>
68 #include <linux/ip.h>
69 #include <linux/uaccess.h>
70 #include <linux/usb/cdc.h>
71 #include <net/arp.h>
72 #include <asm/byteorder.h>
73 #include <linux/serial_core.h>
74 #include <linux/serial.h>
75
76
77 #define MOD_AUTHOR "Option Wireless"
78 #define MOD_DESCRIPTION "USB High Speed Option driver"
79
80 #define HSO_MAX_NET_DEVICES 10
81 #define HSO__MAX_MTU 2048
82 #define DEFAULT_MTU 1500
83 #define DEFAULT_MRU 1500
84
85 #define CTRL_URB_RX_SIZE 1024
86 #define CTRL_URB_TX_SIZE 64
87
88 #define BULK_URB_RX_SIZE 4096
89 #define BULK_URB_TX_SIZE 8192
90
91 #define MUX_BULK_RX_BUF_SIZE HSO__MAX_MTU
92 #define MUX_BULK_TX_BUF_SIZE HSO__MAX_MTU
93 #define MUX_BULK_RX_BUF_COUNT 4
94 #define USB_TYPE_OPTION_VENDOR 0x20
95
96 /* These definitions are used with the struct hso_net flags element */
97 /* - use *_bit operations on it. (bit indices not values.) */
98 #define HSO_NET_RUNNING 0
99
100 #define HSO_NET_TX_TIMEOUT (HZ*10)
101
102 #define HSO_SERIAL_MAGIC 0x48534f31
103
104 /* Number of ttys to handle */
105 #define HSO_SERIAL_TTY_MINORS 256
106
107 #define MAX_RX_URBS 2
108
109 /*****************************************************************************/
110 /* Debugging functions */
111 /*****************************************************************************/
112 #define hso_dbg(lvl, fmt, ...) \
113 do { \
114 if ((lvl) & debug) \
115 pr_info("[%d:%s] " fmt, \
116 __LINE__, __func__, ##__VA_ARGS__); \
117 } while (0)
118
119 /*****************************************************************************/
120 /* Enumerators */
121 /*****************************************************************************/
122 enum pkt_parse_state {
123 WAIT_IP,
124 WAIT_DATA,
125 WAIT_SYNC
126 };
127
128 /*****************************************************************************/
129 /* Structs */
130 /*****************************************************************************/
131
132 struct hso_shared_int {
133 struct usb_endpoint_descriptor *intr_endp;
134 void *shared_intr_buf;
135 struct urb *shared_intr_urb;
136 struct usb_device *usb;
137 int use_count;
138 int ref_count;
139 struct mutex shared_int_lock;
140 };
141
142 struct hso_net {
143 struct hso_device *parent;
144 struct net_device *net;
145 struct rfkill *rfkill;
146 char name[24];
147
148 struct usb_endpoint_descriptor *in_endp;
149 struct usb_endpoint_descriptor *out_endp;
150
151 struct urb *mux_bulk_rx_urb_pool[MUX_BULK_RX_BUF_COUNT];
152 struct urb *mux_bulk_tx_urb;
153 void *mux_bulk_rx_buf_pool[MUX_BULK_RX_BUF_COUNT];
154 void *mux_bulk_tx_buf;
155
156 struct sk_buff *skb_rx_buf;
157 struct sk_buff *skb_tx_buf;
158
159 enum pkt_parse_state rx_parse_state;
160 spinlock_t net_lock;
161
162 unsigned short rx_buf_size;
163 unsigned short rx_buf_missing;
164 struct iphdr rx_ip_hdr;
165
166 unsigned long flags;
167 };
168
169 enum rx_ctrl_state{
170 RX_IDLE,
171 RX_SENT,
172 RX_PENDING
173 };
174
175 #define BM_REQUEST_TYPE (0xa1)
176 #define B_NOTIFICATION (0x20)
177 #define W_VALUE (0x0)
178 #define W_LENGTH (0x2)
179
180 #define B_OVERRUN (0x1<<6)
181 #define B_PARITY (0x1<<5)
182 #define B_FRAMING (0x1<<4)
183 #define B_RING_SIGNAL (0x1<<3)
184 #define B_BREAK (0x1<<2)
185 #define B_TX_CARRIER (0x1<<1)
186 #define B_RX_CARRIER (0x1<<0)
187
188 struct hso_serial_state_notification {
189 u8 bmRequestType;
190 u8 bNotification;
191 u16 wValue;
192 u16 wIndex;
193 u16 wLength;
194 u16 UART_state_bitmap;
195 } __packed;
196
197 struct hso_tiocmget {
198 struct mutex mutex;
199 wait_queue_head_t waitq;
200 int intr_completed;
201 struct usb_endpoint_descriptor *endp;
202 struct urb *urb;
203 struct hso_serial_state_notification serial_state_notification;
204 u16 prev_UART_state_bitmap;
205 struct uart_icount icount;
206 };
207
208
209 struct hso_serial {
210 struct hso_device *parent;
211 int magic;
212 u8 minor;
213
214 struct hso_shared_int *shared_int;
215
216 /* rx/tx urb could be either a bulk urb or a control urb depending
217 on which serial port it is used on. */
218 struct urb *rx_urb[MAX_RX_URBS];
219 u8 num_rx_urbs;
220 u8 *rx_data[MAX_RX_URBS];
221 u16 rx_data_length; /* should contain allocated length */
222
223 struct urb *tx_urb;
224 u8 *tx_data;
225 u8 *tx_buffer;
226 u16 tx_data_length; /* should contain allocated length */
227 u16 tx_data_count;
228 u16 tx_buffer_count;
229 struct usb_ctrlrequest ctrl_req_tx;
230 struct usb_ctrlrequest ctrl_req_rx;
231
232 struct usb_endpoint_descriptor *in_endp;
233 struct usb_endpoint_descriptor *out_endp;
234
235 enum rx_ctrl_state rx_state;
236 u8 rts_state;
237 u8 dtr_state;
238 unsigned tx_urb_used:1;
239
240 struct tty_port port;
241 /* from usb_serial_port */
242 spinlock_t serial_lock;
243
244 int (*write_data) (struct hso_serial *serial);
245 struct hso_tiocmget *tiocmget;
246 /* Hacks required to get flow control
247 * working on the serial receive buffers
248 * so as not to drop characters on the floor.
249 */
250 int curr_rx_urb_idx;
251 u8 rx_urb_filled[MAX_RX_URBS];
252 struct tasklet_struct unthrottle_tasklet;
253 };
254
255 struct hso_device {
256 union {
257 struct hso_serial *dev_serial;
258 struct hso_net *dev_net;
259 } port_data;
260
261 u32 port_spec;
262
263 u8 is_active;
264 u8 usb_gone;
265 struct work_struct async_get_intf;
266 struct work_struct async_put_intf;
267
268 struct usb_device *usb;
269 struct usb_interface *interface;
270
271 struct device *dev;
272 struct kref ref;
273 struct mutex mutex;
274 };
275
276 /* Type of interface */
277 #define HSO_INTF_MASK 0xFF00
278 #define HSO_INTF_MUX 0x0100
279 #define HSO_INTF_BULK 0x0200
280
281 /* Type of port */
282 #define HSO_PORT_MASK 0xFF
283 #define HSO_PORT_NO_PORT 0x0
284 #define HSO_PORT_CONTROL 0x1
285 #define HSO_PORT_APP 0x2
286 #define HSO_PORT_GPS 0x3
287 #define HSO_PORT_PCSC 0x4
288 #define HSO_PORT_APP2 0x5
289 #define HSO_PORT_GPS_CONTROL 0x6
290 #define HSO_PORT_MSD 0x7
291 #define HSO_PORT_VOICE 0x8
292 #define HSO_PORT_DIAG2 0x9
293 #define HSO_PORT_DIAG 0x10
294 #define HSO_PORT_MODEM 0x11
295 #define HSO_PORT_NETWORK 0x12
296
297 /* Additional device info */
298 #define HSO_INFO_MASK 0xFF000000
299 #define HSO_INFO_CRC_BUG 0x01000000
300
301 /*****************************************************************************/
302 /* Prototypes */
303 /*****************************************************************************/
304 /* Serial driver functions */
305 static int hso_serial_tiocmset(struct tty_struct *tty,
306 unsigned int set, unsigned int clear);
307 static void ctrl_callback(struct urb *urb);
308 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial);
309 static void hso_kick_transmit(struct hso_serial *serial);
310 /* Helper functions */
311 static int hso_mux_submit_intr_urb(struct hso_shared_int *mux_int,
312 struct usb_device *usb, gfp_t gfp);
313 static void handle_usb_error(int status, const char *function,
314 struct hso_device *hso_dev);
315 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
316 int type, int dir);
317 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports);
318 static void hso_free_interface(struct usb_interface *intf);
319 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags);
320 static int hso_stop_serial_device(struct hso_device *hso_dev);
321 static int hso_start_net_device(struct hso_device *hso_dev);
322 static void hso_free_shared_int(struct hso_shared_int *shared_int);
323 static int hso_stop_net_device(struct hso_device *hso_dev);
324 static void hso_serial_ref_free(struct kref *ref);
325 static void hso_std_serial_read_bulk_callback(struct urb *urb);
326 static int hso_mux_serial_read(struct hso_serial *serial);
327 static void async_get_intf(struct work_struct *data);
328 static void async_put_intf(struct work_struct *data);
329 static int hso_put_activity(struct hso_device *hso_dev);
330 static int hso_get_activity(struct hso_device *hso_dev);
331 static void tiocmget_intr_callback(struct urb *urb);
332 /*****************************************************************************/
333 /* Helping functions */
334 /*****************************************************************************/
335
336 /* #define DEBUG */
337
dev2net(struct hso_device * hso_dev)338 static inline struct hso_net *dev2net(struct hso_device *hso_dev)
339 {
340 return hso_dev->port_data.dev_net;
341 }
342
dev2ser(struct hso_device * hso_dev)343 static inline struct hso_serial *dev2ser(struct hso_device *hso_dev)
344 {
345 return hso_dev->port_data.dev_serial;
346 }
347
348 /* Debugging functions */
349 #ifdef DEBUG
dbg_dump(int line_count,const char * func_name,unsigned char * buf,unsigned int len)350 static void dbg_dump(int line_count, const char *func_name, unsigned char *buf,
351 unsigned int len)
352 {
353 static char name[255];
354
355 sprintf(name, "hso[%d:%s]", line_count, func_name);
356 print_hex_dump_bytes(name, DUMP_PREFIX_NONE, buf, len);
357 }
358
359 #define DUMP(buf_, len_) \
360 dbg_dump(__LINE__, __func__, (unsigned char *)buf_, len_)
361
362 #define DUMP1(buf_, len_) \
363 do { \
364 if (0x01 & debug) \
365 DUMP(buf_, len_); \
366 } while (0)
367 #else
368 #define DUMP(buf_, len_)
369 #define DUMP1(buf_, len_)
370 #endif
371
372 /* module parameters */
373 static int debug;
374 static int tty_major;
375 static int disable_net;
376
377 /* driver info */
378 static const char driver_name[] = "hso";
379 static const char tty_filename[] = "ttyHS";
380 static const char *version = __FILE__ ": " MOD_AUTHOR;
381 /* the usb driver itself (registered in hso_init) */
382 static struct usb_driver hso_driver;
383 /* serial structures */
384 static struct tty_driver *tty_drv;
385 static struct hso_device *serial_table[HSO_SERIAL_TTY_MINORS];
386 static struct hso_device *network_table[HSO_MAX_NET_DEVICES];
387 static spinlock_t serial_table_lock;
388
389 static const s32 default_port_spec[] = {
390 HSO_INTF_MUX | HSO_PORT_NETWORK,
391 HSO_INTF_BULK | HSO_PORT_DIAG,
392 HSO_INTF_BULK | HSO_PORT_MODEM,
393 0
394 };
395
396 static const s32 icon321_port_spec[] = {
397 HSO_INTF_MUX | HSO_PORT_NETWORK,
398 HSO_INTF_BULK | HSO_PORT_DIAG2,
399 HSO_INTF_BULK | HSO_PORT_MODEM,
400 HSO_INTF_BULK | HSO_PORT_DIAG,
401 0
402 };
403
404 #define default_port_device(vendor, product) \
405 USB_DEVICE(vendor, product), \
406 .driver_info = (kernel_ulong_t)default_port_spec
407
408 #define icon321_port_device(vendor, product) \
409 USB_DEVICE(vendor, product), \
410 .driver_info = (kernel_ulong_t)icon321_port_spec
411
412 /* list of devices we support */
413 static const struct usb_device_id hso_ids[] = {
414 {default_port_device(0x0af0, 0x6711)},
415 {default_port_device(0x0af0, 0x6731)},
416 {default_port_device(0x0af0, 0x6751)},
417 {default_port_device(0x0af0, 0x6771)},
418 {default_port_device(0x0af0, 0x6791)},
419 {default_port_device(0x0af0, 0x6811)},
420 {default_port_device(0x0af0, 0x6911)},
421 {default_port_device(0x0af0, 0x6951)},
422 {default_port_device(0x0af0, 0x6971)},
423 {default_port_device(0x0af0, 0x7011)},
424 {default_port_device(0x0af0, 0x7031)},
425 {default_port_device(0x0af0, 0x7051)},
426 {default_port_device(0x0af0, 0x7071)},
427 {default_port_device(0x0af0, 0x7111)},
428 {default_port_device(0x0af0, 0x7211)},
429 {default_port_device(0x0af0, 0x7251)},
430 {default_port_device(0x0af0, 0x7271)},
431 {default_port_device(0x0af0, 0x7311)},
432 {default_port_device(0x0af0, 0xc031)}, /* Icon-Edge */
433 {icon321_port_device(0x0af0, 0xd013)}, /* Module HSxPA */
434 {icon321_port_device(0x0af0, 0xd031)}, /* Icon-321 */
435 {icon321_port_device(0x0af0, 0xd033)}, /* Icon-322 */
436 {USB_DEVICE(0x0af0, 0x7301)}, /* GE40x */
437 {USB_DEVICE(0x0af0, 0x7361)}, /* GE40x */
438 {USB_DEVICE(0x0af0, 0x7381)}, /* GE40x */
439 {USB_DEVICE(0x0af0, 0x7401)}, /* GI 0401 */
440 {USB_DEVICE(0x0af0, 0x7501)}, /* GTM 382 */
441 {USB_DEVICE(0x0af0, 0x7601)}, /* GE40x */
442 {USB_DEVICE(0x0af0, 0x7701)},
443 {USB_DEVICE(0x0af0, 0x7706)},
444 {USB_DEVICE(0x0af0, 0x7801)},
445 {USB_DEVICE(0x0af0, 0x7901)},
446 {USB_DEVICE(0x0af0, 0x7A01)},
447 {USB_DEVICE(0x0af0, 0x7A05)},
448 {USB_DEVICE(0x0af0, 0x8200)},
449 {USB_DEVICE(0x0af0, 0x8201)},
450 {USB_DEVICE(0x0af0, 0x8300)},
451 {USB_DEVICE(0x0af0, 0x8302)},
452 {USB_DEVICE(0x0af0, 0x8304)},
453 {USB_DEVICE(0x0af0, 0x8400)},
454 {USB_DEVICE(0x0af0, 0x8600)},
455 {USB_DEVICE(0x0af0, 0x8800)},
456 {USB_DEVICE(0x0af0, 0x8900)},
457 {USB_DEVICE(0x0af0, 0x9000)},
458 {USB_DEVICE(0x0af0, 0x9200)}, /* Option GTM671WFS */
459 {USB_DEVICE(0x0af0, 0xd035)},
460 {USB_DEVICE(0x0af0, 0xd055)},
461 {USB_DEVICE(0x0af0, 0xd155)},
462 {USB_DEVICE(0x0af0, 0xd255)},
463 {USB_DEVICE(0x0af0, 0xd057)},
464 {USB_DEVICE(0x0af0, 0xd157)},
465 {USB_DEVICE(0x0af0, 0xd257)},
466 {USB_DEVICE(0x0af0, 0xd357)},
467 {USB_DEVICE(0x0af0, 0xd058)},
468 {USB_DEVICE(0x0af0, 0xc100)},
469 {}
470 };
471 MODULE_DEVICE_TABLE(usb, hso_ids);
472
473 /* Sysfs attribute */
hso_sysfs_show_porttype(struct device * dev,struct device_attribute * attr,char * buf)474 static ssize_t hso_sysfs_show_porttype(struct device *dev,
475 struct device_attribute *attr,
476 char *buf)
477 {
478 struct hso_device *hso_dev = dev_get_drvdata(dev);
479 char *port_name;
480
481 if (!hso_dev)
482 return 0;
483
484 switch (hso_dev->port_spec & HSO_PORT_MASK) {
485 case HSO_PORT_CONTROL:
486 port_name = "Control";
487 break;
488 case HSO_PORT_APP:
489 port_name = "Application";
490 break;
491 case HSO_PORT_APP2:
492 port_name = "Application2";
493 break;
494 case HSO_PORT_GPS:
495 port_name = "GPS";
496 break;
497 case HSO_PORT_GPS_CONTROL:
498 port_name = "GPS Control";
499 break;
500 case HSO_PORT_PCSC:
501 port_name = "PCSC";
502 break;
503 case HSO_PORT_DIAG:
504 port_name = "Diagnostic";
505 break;
506 case HSO_PORT_DIAG2:
507 port_name = "Diagnostic2";
508 break;
509 case HSO_PORT_MODEM:
510 port_name = "Modem";
511 break;
512 case HSO_PORT_NETWORK:
513 port_name = "Network";
514 break;
515 default:
516 port_name = "Unknown";
517 break;
518 }
519
520 return sprintf(buf, "%s\n", port_name);
521 }
522 static DEVICE_ATTR(hsotype, 0444, hso_sysfs_show_porttype, NULL);
523
524 static struct attribute *hso_serial_dev_attrs[] = {
525 &dev_attr_hsotype.attr,
526 NULL
527 };
528
529 ATTRIBUTE_GROUPS(hso_serial_dev);
530
hso_urb_to_index(struct hso_serial * serial,struct urb * urb)531 static int hso_urb_to_index(struct hso_serial *serial, struct urb *urb)
532 {
533 int idx;
534
535 for (idx = 0; idx < serial->num_rx_urbs; idx++)
536 if (serial->rx_urb[idx] == urb)
537 return idx;
538 dev_err(serial->parent->dev, "hso_urb_to_index failed\n");
539 return -1;
540 }
541
542 /* converts mux value to a port spec value */
hso_mux_to_port(int mux)543 static u32 hso_mux_to_port(int mux)
544 {
545 u32 result;
546
547 switch (mux) {
548 case 0x1:
549 result = HSO_PORT_CONTROL;
550 break;
551 case 0x2:
552 result = HSO_PORT_APP;
553 break;
554 case 0x4:
555 result = HSO_PORT_PCSC;
556 break;
557 case 0x8:
558 result = HSO_PORT_GPS;
559 break;
560 case 0x10:
561 result = HSO_PORT_APP2;
562 break;
563 default:
564 result = HSO_PORT_NO_PORT;
565 }
566 return result;
567 }
568
569 /* converts port spec value to a mux value */
hso_port_to_mux(int port)570 static u32 hso_port_to_mux(int port)
571 {
572 u32 result;
573
574 switch (port & HSO_PORT_MASK) {
575 case HSO_PORT_CONTROL:
576 result = 0x0;
577 break;
578 case HSO_PORT_APP:
579 result = 0x1;
580 break;
581 case HSO_PORT_PCSC:
582 result = 0x2;
583 break;
584 case HSO_PORT_GPS:
585 result = 0x3;
586 break;
587 case HSO_PORT_APP2:
588 result = 0x4;
589 break;
590 default:
591 result = 0x0;
592 }
593 return result;
594 }
595
get_serial_by_shared_int_and_type(struct hso_shared_int * shared_int,int mux)596 static struct hso_serial *get_serial_by_shared_int_and_type(
597 struct hso_shared_int *shared_int,
598 int mux)
599 {
600 int i, port;
601
602 port = hso_mux_to_port(mux);
603
604 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
605 if (serial_table[i] &&
606 (dev2ser(serial_table[i])->shared_int == shared_int) &&
607 ((serial_table[i]->port_spec & HSO_PORT_MASK) == port)) {
608 return dev2ser(serial_table[i]);
609 }
610 }
611
612 return NULL;
613 }
614
get_serial_by_index(unsigned index)615 static struct hso_serial *get_serial_by_index(unsigned index)
616 {
617 struct hso_serial *serial = NULL;
618 unsigned long flags;
619
620 spin_lock_irqsave(&serial_table_lock, flags);
621 if (serial_table[index])
622 serial = dev2ser(serial_table[index]);
623 spin_unlock_irqrestore(&serial_table_lock, flags);
624
625 return serial;
626 }
627
get_free_serial_index(void)628 static int get_free_serial_index(void)
629 {
630 int index;
631 unsigned long flags;
632
633 spin_lock_irqsave(&serial_table_lock, flags);
634 for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) {
635 if (serial_table[index] == NULL) {
636 spin_unlock_irqrestore(&serial_table_lock, flags);
637 return index;
638 }
639 }
640 spin_unlock_irqrestore(&serial_table_lock, flags);
641
642 pr_err("%s: no free serial devices in table\n", __func__);
643 return -1;
644 }
645
set_serial_by_index(unsigned index,struct hso_serial * serial)646 static void set_serial_by_index(unsigned index, struct hso_serial *serial)
647 {
648 unsigned long flags;
649
650 spin_lock_irqsave(&serial_table_lock, flags);
651 if (serial)
652 serial_table[index] = serial->parent;
653 else
654 serial_table[index] = NULL;
655 spin_unlock_irqrestore(&serial_table_lock, flags);
656 }
657
handle_usb_error(int status,const char * function,struct hso_device * hso_dev)658 static void handle_usb_error(int status, const char *function,
659 struct hso_device *hso_dev)
660 {
661 char *explanation;
662
663 switch (status) {
664 case -ENODEV:
665 explanation = "no device";
666 break;
667 case -ENOENT:
668 explanation = "endpoint not enabled";
669 break;
670 case -EPIPE:
671 explanation = "endpoint stalled";
672 break;
673 case -ENOSPC:
674 explanation = "not enough bandwidth";
675 break;
676 case -ESHUTDOWN:
677 explanation = "device disabled";
678 break;
679 case -EHOSTUNREACH:
680 explanation = "device suspended";
681 break;
682 case -EINVAL:
683 case -EAGAIN:
684 case -EFBIG:
685 case -EMSGSIZE:
686 explanation = "internal error";
687 break;
688 case -EILSEQ:
689 case -EPROTO:
690 case -ETIME:
691 case -ETIMEDOUT:
692 explanation = "protocol error";
693 if (hso_dev)
694 usb_queue_reset_device(hso_dev->interface);
695 break;
696 default:
697 explanation = "unknown status";
698 break;
699 }
700
701 /* log a meaningful explanation of an USB status */
702 hso_dbg(0x1, "%s: received USB status - %s (%d)\n",
703 function, explanation, status);
704 }
705
706 /* Network interface functions */
707
708 /* called when net interface is brought up by ifconfig */
hso_net_open(struct net_device * net)709 static int hso_net_open(struct net_device *net)
710 {
711 struct hso_net *odev = netdev_priv(net);
712 unsigned long flags = 0;
713
714 if (!odev) {
715 dev_err(&net->dev, "No net device !\n");
716 return -ENODEV;
717 }
718
719 odev->skb_tx_buf = NULL;
720
721 /* setup environment */
722 spin_lock_irqsave(&odev->net_lock, flags);
723 odev->rx_parse_state = WAIT_IP;
724 odev->rx_buf_size = 0;
725 odev->rx_buf_missing = sizeof(struct iphdr);
726 spin_unlock_irqrestore(&odev->net_lock, flags);
727
728 /* We are up and running. */
729 set_bit(HSO_NET_RUNNING, &odev->flags);
730 hso_start_net_device(odev->parent);
731
732 /* Tell the kernel we are ready to start receiving from it */
733 netif_start_queue(net);
734
735 return 0;
736 }
737
738 /* called when interface is brought down by ifconfig */
hso_net_close(struct net_device * net)739 static int hso_net_close(struct net_device *net)
740 {
741 struct hso_net *odev = netdev_priv(net);
742
743 /* we don't need the queue anymore */
744 netif_stop_queue(net);
745 /* no longer running */
746 clear_bit(HSO_NET_RUNNING, &odev->flags);
747
748 hso_stop_net_device(odev->parent);
749
750 /* done */
751 return 0;
752 }
753
754 /* USB tells is xmit done, we should start the netqueue again */
write_bulk_callback(struct urb * urb)755 static void write_bulk_callback(struct urb *urb)
756 {
757 struct hso_net *odev = urb->context;
758 int status = urb->status;
759
760 /* Sanity check */
761 if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
762 dev_err(&urb->dev->dev, "%s: device not running\n", __func__);
763 return;
764 }
765
766 /* Do we still have a valid kernel network device? */
767 if (!netif_device_present(odev->net)) {
768 dev_err(&urb->dev->dev, "%s: net device not present\n",
769 __func__);
770 return;
771 }
772
773 /* log status, but don't act on it, we don't need to resubmit anything
774 * anyhow */
775 if (status)
776 handle_usb_error(status, __func__, odev->parent);
777
778 hso_put_activity(odev->parent);
779
780 /* Tell the network interface we are ready for another frame */
781 netif_wake_queue(odev->net);
782 }
783
784 /* called by kernel when we need to transmit a packet */
hso_net_start_xmit(struct sk_buff * skb,struct net_device * net)785 static netdev_tx_t hso_net_start_xmit(struct sk_buff *skb,
786 struct net_device *net)
787 {
788 struct hso_net *odev = netdev_priv(net);
789 int result;
790
791 /* Tell the kernel, "No more frames 'til we are done with this one." */
792 netif_stop_queue(net);
793 if (hso_get_activity(odev->parent) == -EAGAIN) {
794 odev->skb_tx_buf = skb;
795 return NETDEV_TX_OK;
796 }
797
798 /* log if asked */
799 DUMP1(skb->data, skb->len);
800 /* Copy it from kernel memory to OUR memory */
801 memcpy(odev->mux_bulk_tx_buf, skb->data, skb->len);
802 hso_dbg(0x1, "len: %d/%d\n", skb->len, MUX_BULK_TX_BUF_SIZE);
803
804 /* Fill in the URB for shipping it out. */
805 usb_fill_bulk_urb(odev->mux_bulk_tx_urb,
806 odev->parent->usb,
807 usb_sndbulkpipe(odev->parent->usb,
808 odev->out_endp->
809 bEndpointAddress & 0x7F),
810 odev->mux_bulk_tx_buf, skb->len, write_bulk_callback,
811 odev);
812
813 /* Deal with the Zero Length packet problem, I hope */
814 odev->mux_bulk_tx_urb->transfer_flags |= URB_ZERO_PACKET;
815
816 /* Send the URB on its merry way. */
817 result = usb_submit_urb(odev->mux_bulk_tx_urb, GFP_ATOMIC);
818 if (result) {
819 dev_warn(&odev->parent->interface->dev,
820 "failed mux_bulk_tx_urb %d\n", result);
821 net->stats.tx_errors++;
822 netif_start_queue(net);
823 } else {
824 net->stats.tx_packets++;
825 net->stats.tx_bytes += skb->len;
826 }
827 dev_kfree_skb(skb);
828 /* we're done */
829 return NETDEV_TX_OK;
830 }
831
832 static const struct ethtool_ops ops = {
833 .get_link = ethtool_op_get_link
834 };
835
836 /* called when a packet did not ack after watchdogtimeout */
hso_net_tx_timeout(struct net_device * net)837 static void hso_net_tx_timeout(struct net_device *net)
838 {
839 struct hso_net *odev = netdev_priv(net);
840
841 if (!odev)
842 return;
843
844 /* Tell syslog we are hosed. */
845 dev_warn(&net->dev, "Tx timed out.\n");
846
847 /* Tear the waiting frame off the list */
848 if (odev->mux_bulk_tx_urb &&
849 (odev->mux_bulk_tx_urb->status == -EINPROGRESS))
850 usb_unlink_urb(odev->mux_bulk_tx_urb);
851
852 /* Update statistics */
853 net->stats.tx_errors++;
854 }
855
856 /* 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)857 static void packetizeRx(struct hso_net *odev, unsigned char *ip_pkt,
858 unsigned int count, unsigned char is_eop)
859 {
860 unsigned short temp_bytes;
861 unsigned short buffer_offset = 0;
862 unsigned short frame_len;
863
864 /* log if needed */
865 hso_dbg(0x1, "Rx %d bytes\n", count);
866 DUMP(ip_pkt, min(128, (int)count));
867
868 while (count) {
869 switch (odev->rx_parse_state) {
870 case WAIT_IP:
871 /* waiting for IP header. */
872 /* wanted bytes - size of ip header */
873 temp_bytes =
874 (count <
875 odev->rx_buf_missing) ? count : odev->
876 rx_buf_missing;
877
878 memcpy(((unsigned char *)(&odev->rx_ip_hdr)) +
879 odev->rx_buf_size, ip_pkt + buffer_offset,
880 temp_bytes);
881
882 odev->rx_buf_size += temp_bytes;
883 buffer_offset += temp_bytes;
884 odev->rx_buf_missing -= temp_bytes;
885 count -= temp_bytes;
886
887 if (!odev->rx_buf_missing) {
888 /* header is complete allocate an sk_buffer and
889 * continue to WAIT_DATA */
890 frame_len = ntohs(odev->rx_ip_hdr.tot_len);
891
892 if ((frame_len > DEFAULT_MRU) ||
893 (frame_len < sizeof(struct iphdr))) {
894 dev_err(&odev->net->dev,
895 "Invalid frame (%d) length\n",
896 frame_len);
897 odev->rx_parse_state = WAIT_SYNC;
898 continue;
899 }
900 /* Allocate an sk_buff */
901 odev->skb_rx_buf = netdev_alloc_skb(odev->net,
902 frame_len);
903 if (!odev->skb_rx_buf) {
904 /* We got no receive buffer. */
905 hso_dbg(0x1, "could not allocate memory\n");
906 odev->rx_parse_state = WAIT_SYNC;
907 continue;
908 }
909
910 /* Copy what we got so far. make room for iphdr
911 * after tail. */
912 skb_put_data(odev->skb_rx_buf,
913 (char *)&(odev->rx_ip_hdr),
914 sizeof(struct iphdr));
915
916 /* ETH_HLEN */
917 odev->rx_buf_size = sizeof(struct iphdr);
918
919 /* Filip actually use .tot_len */
920 odev->rx_buf_missing =
921 frame_len - sizeof(struct iphdr);
922 odev->rx_parse_state = WAIT_DATA;
923 }
924 break;
925
926 case WAIT_DATA:
927 temp_bytes = (count < odev->rx_buf_missing)
928 ? count : odev->rx_buf_missing;
929
930 /* Copy the rest of the bytes that are left in the
931 * buffer into the waiting sk_buf. */
932 /* Make room for temp_bytes after tail. */
933 skb_put_data(odev->skb_rx_buf,
934 ip_pkt + buffer_offset,
935 temp_bytes);
936
937 odev->rx_buf_missing -= temp_bytes;
938 count -= temp_bytes;
939 buffer_offset += temp_bytes;
940 odev->rx_buf_size += temp_bytes;
941 if (!odev->rx_buf_missing) {
942 /* Packet is complete. Inject into stack. */
943 /* We have IP packet here */
944 odev->skb_rx_buf->protocol = cpu_to_be16(ETH_P_IP);
945 skb_reset_mac_header(odev->skb_rx_buf);
946
947 /* Ship it off to the kernel */
948 netif_rx(odev->skb_rx_buf);
949 /* No longer our buffer. */
950 odev->skb_rx_buf = NULL;
951
952 /* update out statistics */
953 odev->net->stats.rx_packets++;
954
955 odev->net->stats.rx_bytes += odev->rx_buf_size;
956
957 odev->rx_buf_size = 0;
958 odev->rx_buf_missing = sizeof(struct iphdr);
959 odev->rx_parse_state = WAIT_IP;
960 }
961 break;
962
963 case WAIT_SYNC:
964 hso_dbg(0x1, " W_S\n");
965 count = 0;
966 break;
967 default:
968 hso_dbg(0x1, "\n");
969 count--;
970 break;
971 }
972 }
973
974 /* Recovery mechanism for WAIT_SYNC state. */
975 if (is_eop) {
976 if (odev->rx_parse_state == WAIT_SYNC) {
977 odev->rx_parse_state = WAIT_IP;
978 odev->rx_buf_size = 0;
979 odev->rx_buf_missing = sizeof(struct iphdr);
980 }
981 }
982 }
983
fix_crc_bug(struct urb * urb,__le16 max_packet_size)984 static void fix_crc_bug(struct urb *urb, __le16 max_packet_size)
985 {
986 static const u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
987 u32 rest = urb->actual_length % le16_to_cpu(max_packet_size);
988
989 if (((rest == 5) || (rest == 6)) &&
990 !memcmp(((u8 *)urb->transfer_buffer) + urb->actual_length - 4,
991 crc_check, 4)) {
992 urb->actual_length -= 4;
993 }
994 }
995
996 /* Moving data from usb to kernel (in interrupt state) */
read_bulk_callback(struct urb * urb)997 static void read_bulk_callback(struct urb *urb)
998 {
999 struct hso_net *odev = urb->context;
1000 struct net_device *net;
1001 int result;
1002 unsigned long flags;
1003 int status = urb->status;
1004
1005 /* is al ok? (Filip: Who's Al ?) */
1006 if (status) {
1007 handle_usb_error(status, __func__, odev->parent);
1008 return;
1009 }
1010
1011 /* Sanity check */
1012 if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
1013 hso_dbg(0x1, "BULK IN callback but driver is not active!\n");
1014 return;
1015 }
1016 usb_mark_last_busy(urb->dev);
1017
1018 net = odev->net;
1019
1020 if (!netif_device_present(net)) {
1021 /* Somebody killed our network interface... */
1022 return;
1023 }
1024
1025 if (odev->parent->port_spec & HSO_INFO_CRC_BUG)
1026 fix_crc_bug(urb, odev->in_endp->wMaxPacketSize);
1027
1028 /* do we even have a packet? */
1029 if (urb->actual_length) {
1030 /* Handle the IP stream, add header and push it onto network
1031 * stack if the packet is complete. */
1032 spin_lock_irqsave(&odev->net_lock, flags);
1033 packetizeRx(odev, urb->transfer_buffer, urb->actual_length,
1034 (urb->transfer_buffer_length >
1035 urb->actual_length) ? 1 : 0);
1036 spin_unlock_irqrestore(&odev->net_lock, flags);
1037 }
1038
1039 /* We are done with this URB, resubmit it. Prep the USB to wait for
1040 * another frame. Reuse same as received. */
1041 usb_fill_bulk_urb(urb,
1042 odev->parent->usb,
1043 usb_rcvbulkpipe(odev->parent->usb,
1044 odev->in_endp->
1045 bEndpointAddress & 0x7F),
1046 urb->transfer_buffer, MUX_BULK_RX_BUF_SIZE,
1047 read_bulk_callback, odev);
1048
1049 /* Give this to the USB subsystem so it can tell us when more data
1050 * arrives. */
1051 result = usb_submit_urb(urb, GFP_ATOMIC);
1052 if (result)
1053 dev_warn(&odev->parent->interface->dev,
1054 "%s failed submit mux_bulk_rx_urb %d\n", __func__,
1055 result);
1056 }
1057
1058 /* Serial driver functions */
1059
hso_init_termios(struct ktermios * termios)1060 static void hso_init_termios(struct ktermios *termios)
1061 {
1062 /*
1063 * The default requirements for this device are:
1064 */
1065 termios->c_iflag &=
1066 ~(IGNBRK /* disable ignore break */
1067 | BRKINT /* disable break causes interrupt */
1068 | PARMRK /* disable mark parity errors */
1069 | ISTRIP /* disable clear high bit of input characters */
1070 | INLCR /* disable translate NL to CR */
1071 | IGNCR /* disable ignore CR */
1072 | ICRNL /* disable translate CR to NL */
1073 | IXON); /* disable enable XON/XOFF flow control */
1074
1075 /* disable postprocess output characters */
1076 termios->c_oflag &= ~OPOST;
1077
1078 termios->c_lflag &=
1079 ~(ECHO /* disable echo input characters */
1080 | ECHONL /* disable echo new line */
1081 | ICANON /* disable erase, kill, werase, and rprnt
1082 special characters */
1083 | ISIG /* disable interrupt, quit, and suspend special
1084 characters */
1085 | IEXTEN); /* disable non-POSIX special characters */
1086
1087 termios->c_cflag &=
1088 ~(CSIZE /* no size */
1089 | PARENB /* disable parity bit */
1090 | CBAUD /* clear current baud rate */
1091 | CBAUDEX); /* clear current buad rate */
1092
1093 termios->c_cflag |= CS8; /* character size 8 bits */
1094
1095 /* baud rate 115200 */
1096 tty_termios_encode_baud_rate(termios, 115200, 115200);
1097 }
1098
_hso_serial_set_termios(struct tty_struct * tty,struct ktermios * old)1099 static void _hso_serial_set_termios(struct tty_struct *tty,
1100 struct ktermios *old)
1101 {
1102 struct hso_serial *serial = tty->driver_data;
1103
1104 if (!serial) {
1105 pr_err("%s: no tty structures", __func__);
1106 return;
1107 }
1108
1109 hso_dbg(0x8, "port %d\n", serial->minor);
1110
1111 /*
1112 * Fix up unsupported bits
1113 */
1114 tty->termios.c_iflag &= ~IXON; /* disable enable XON/XOFF flow control */
1115
1116 tty->termios.c_cflag &=
1117 ~(CSIZE /* no size */
1118 | PARENB /* disable parity bit */
1119 | CBAUD /* clear current baud rate */
1120 | CBAUDEX); /* clear current buad rate */
1121
1122 tty->termios.c_cflag |= CS8; /* character size 8 bits */
1123
1124 /* baud rate 115200 */
1125 tty_encode_baud_rate(tty, 115200, 115200);
1126 }
1127
hso_resubmit_rx_bulk_urb(struct hso_serial * serial,struct urb * urb)1128 static void hso_resubmit_rx_bulk_urb(struct hso_serial *serial, struct urb *urb)
1129 {
1130 int result;
1131 /* We are done with this URB, resubmit it. Prep the USB to wait for
1132 * another frame */
1133 usb_fill_bulk_urb(urb, serial->parent->usb,
1134 usb_rcvbulkpipe(serial->parent->usb,
1135 serial->in_endp->
1136 bEndpointAddress & 0x7F),
1137 urb->transfer_buffer, serial->rx_data_length,
1138 hso_std_serial_read_bulk_callback, serial);
1139 /* Give this to the USB subsystem so it can tell us when more data
1140 * arrives. */
1141 result = usb_submit_urb(urb, GFP_ATOMIC);
1142 if (result) {
1143 dev_err(&urb->dev->dev, "%s failed submit serial rx_urb %d\n",
1144 __func__, result);
1145 }
1146 }
1147
1148
1149
1150
put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial * serial)1151 static void put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial *serial)
1152 {
1153 int count;
1154 struct urb *curr_urb;
1155
1156 while (serial->rx_urb_filled[serial->curr_rx_urb_idx]) {
1157 curr_urb = serial->rx_urb[serial->curr_rx_urb_idx];
1158 count = put_rxbuf_data(curr_urb, serial);
1159 if (count == -1)
1160 return;
1161 if (count == 0) {
1162 serial->curr_rx_urb_idx++;
1163 if (serial->curr_rx_urb_idx >= serial->num_rx_urbs)
1164 serial->curr_rx_urb_idx = 0;
1165 hso_resubmit_rx_bulk_urb(serial, curr_urb);
1166 }
1167 }
1168 }
1169
put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial * serial)1170 static void put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial *serial)
1171 {
1172 int count = 0;
1173 struct urb *urb;
1174
1175 urb = serial->rx_urb[0];
1176 if (serial->port.count > 0) {
1177 count = put_rxbuf_data(urb, serial);
1178 if (count == -1)
1179 return;
1180 }
1181 /* Re issue a read as long as we receive data. */
1182
1183 if (count == 0 && ((urb->actual_length != 0) ||
1184 (serial->rx_state == RX_PENDING))) {
1185 serial->rx_state = RX_SENT;
1186 hso_mux_serial_read(serial);
1187 } else
1188 serial->rx_state = RX_IDLE;
1189 }
1190
1191
1192 /* read callback for Diag and CS port */
hso_std_serial_read_bulk_callback(struct urb * urb)1193 static void hso_std_serial_read_bulk_callback(struct urb *urb)
1194 {
1195 struct hso_serial *serial = urb->context;
1196 int status = urb->status;
1197 unsigned long flags;
1198
1199 hso_dbg(0x8, "--- Got serial_read_bulk callback %02x ---\n", status);
1200
1201 /* sanity check */
1202 if (!serial) {
1203 hso_dbg(0x1, "serial == NULL\n");
1204 return;
1205 }
1206 if (status) {
1207 handle_usb_error(status, __func__, serial->parent);
1208 return;
1209 }
1210
1211 hso_dbg(0x1, "Actual length = %d\n", urb->actual_length);
1212 DUMP1(urb->transfer_buffer, urb->actual_length);
1213
1214 /* Anyone listening? */
1215 if (serial->port.count == 0)
1216 return;
1217
1218 if (serial->parent->port_spec & HSO_INFO_CRC_BUG)
1219 fix_crc_bug(urb, serial->in_endp->wMaxPacketSize);
1220 /* Valid data, handle RX data */
1221 spin_lock_irqsave(&serial->serial_lock, flags);
1222 serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 1;
1223 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1224 spin_unlock_irqrestore(&serial->serial_lock, flags);
1225 }
1226
1227 /*
1228 * This needs to be a tasklet otherwise we will
1229 * end up recursively calling this function.
1230 */
hso_unthrottle_tasklet(struct hso_serial * serial)1231 static void hso_unthrottle_tasklet(struct hso_serial *serial)
1232 {
1233 unsigned long flags;
1234
1235 spin_lock_irqsave(&serial->serial_lock, flags);
1236 if ((serial->parent->port_spec & HSO_INTF_MUX))
1237 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1238 else
1239 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1240 spin_unlock_irqrestore(&serial->serial_lock, flags);
1241 }
1242
hso_unthrottle(struct tty_struct * tty)1243 static void hso_unthrottle(struct tty_struct *tty)
1244 {
1245 struct hso_serial *serial = tty->driver_data;
1246
1247 tasklet_hi_schedule(&serial->unthrottle_tasklet);
1248 }
1249
1250 /* open the requested serial port */
hso_serial_open(struct tty_struct * tty,struct file * filp)1251 static int hso_serial_open(struct tty_struct *tty, struct file *filp)
1252 {
1253 struct hso_serial *serial = get_serial_by_index(tty->index);
1254 int result;
1255
1256 /* sanity check */
1257 if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
1258 WARN_ON(1);
1259 tty->driver_data = NULL;
1260 hso_dbg(0x1, "Failed to open port\n");
1261 return -ENODEV;
1262 }
1263
1264 mutex_lock(&serial->parent->mutex);
1265 result = usb_autopm_get_interface(serial->parent->interface);
1266 if (result < 0)
1267 goto err_out;
1268
1269 hso_dbg(0x1, "Opening %d\n", serial->minor);
1270
1271 /* setup */
1272 tty->driver_data = serial;
1273 tty_port_tty_set(&serial->port, tty);
1274
1275 /* check for port already opened, if not set the termios */
1276 serial->port.count++;
1277 if (serial->port.count == 1) {
1278 serial->rx_state = RX_IDLE;
1279 /* Force default termio settings */
1280 _hso_serial_set_termios(tty, NULL);
1281 tasklet_init(&serial->unthrottle_tasklet,
1282 (void (*)(unsigned long))hso_unthrottle_tasklet,
1283 (unsigned long)serial);
1284 result = hso_start_serial_device(serial->parent, GFP_KERNEL);
1285 if (result) {
1286 hso_stop_serial_device(serial->parent);
1287 serial->port.count--;
1288 } else {
1289 kref_get(&serial->parent->ref);
1290 }
1291 } else {
1292 hso_dbg(0x1, "Port was already open\n");
1293 }
1294
1295 usb_autopm_put_interface(serial->parent->interface);
1296
1297 /* done */
1298 if (result)
1299 hso_serial_tiocmset(tty, TIOCM_RTS | TIOCM_DTR, 0);
1300 err_out:
1301 mutex_unlock(&serial->parent->mutex);
1302 return result;
1303 }
1304
1305 /* close the requested serial port */
hso_serial_close(struct tty_struct * tty,struct file * filp)1306 static void hso_serial_close(struct tty_struct *tty, struct file *filp)
1307 {
1308 struct hso_serial *serial = tty->driver_data;
1309 u8 usb_gone;
1310
1311 hso_dbg(0x1, "Closing serial port\n");
1312
1313 /* Open failed, no close cleanup required */
1314 if (serial == NULL)
1315 return;
1316
1317 mutex_lock(&serial->parent->mutex);
1318 usb_gone = serial->parent->usb_gone;
1319
1320 if (!usb_gone)
1321 usb_autopm_get_interface(serial->parent->interface);
1322
1323 /* reset the rts and dtr */
1324 /* do the actual close */
1325 serial->port.count--;
1326
1327 if (serial->port.count <= 0) {
1328 serial->port.count = 0;
1329 tty_port_tty_set(&serial->port, NULL);
1330 if (!usb_gone)
1331 hso_stop_serial_device(serial->parent);
1332 tasklet_kill(&serial->unthrottle_tasklet);
1333 }
1334
1335 if (!usb_gone)
1336 usb_autopm_put_interface(serial->parent->interface);
1337
1338 mutex_unlock(&serial->parent->mutex);
1339 }
1340
1341 /* close the requested serial port */
hso_serial_write(struct tty_struct * tty,const unsigned char * buf,int count)1342 static int hso_serial_write(struct tty_struct *tty, const unsigned char *buf,
1343 int count)
1344 {
1345 struct hso_serial *serial = tty->driver_data;
1346 int space, tx_bytes;
1347 unsigned long flags;
1348
1349 /* sanity check */
1350 if (serial == NULL) {
1351 pr_err("%s: serial is NULL\n", __func__);
1352 return -ENODEV;
1353 }
1354
1355 spin_lock_irqsave(&serial->serial_lock, flags);
1356
1357 space = serial->tx_data_length - serial->tx_buffer_count;
1358 tx_bytes = (count < space) ? count : space;
1359
1360 if (!tx_bytes)
1361 goto out;
1362
1363 memcpy(serial->tx_buffer + serial->tx_buffer_count, buf, tx_bytes);
1364 serial->tx_buffer_count += tx_bytes;
1365
1366 out:
1367 spin_unlock_irqrestore(&serial->serial_lock, flags);
1368
1369 hso_kick_transmit(serial);
1370 /* done */
1371 return tx_bytes;
1372 }
1373
1374 /* how much room is there for writing */
hso_serial_write_room(struct tty_struct * tty)1375 static int hso_serial_write_room(struct tty_struct *tty)
1376 {
1377 struct hso_serial *serial = tty->driver_data;
1378 int room;
1379 unsigned long flags;
1380
1381 spin_lock_irqsave(&serial->serial_lock, flags);
1382 room = serial->tx_data_length - serial->tx_buffer_count;
1383 spin_unlock_irqrestore(&serial->serial_lock, flags);
1384
1385 /* return free room */
1386 return room;
1387 }
1388
hso_serial_cleanup(struct tty_struct * tty)1389 static void hso_serial_cleanup(struct tty_struct *tty)
1390 {
1391 struct hso_serial *serial = tty->driver_data;
1392
1393 if (!serial)
1394 return;
1395
1396 kref_put(&serial->parent->ref, hso_serial_ref_free);
1397 }
1398
1399 /* setup the term */
hso_serial_set_termios(struct tty_struct * tty,struct ktermios * old)1400 static void hso_serial_set_termios(struct tty_struct *tty, struct ktermios *old)
1401 {
1402 struct hso_serial *serial = tty->driver_data;
1403 unsigned long flags;
1404
1405 if (old)
1406 hso_dbg(0x16, "Termios called with: cflags new[%d] - old[%d]\n",
1407 tty->termios.c_cflag, old->c_cflag);
1408
1409 /* the actual setup */
1410 spin_lock_irqsave(&serial->serial_lock, flags);
1411 if (serial->port.count)
1412 _hso_serial_set_termios(tty, old);
1413 else
1414 tty->termios = *old;
1415 spin_unlock_irqrestore(&serial->serial_lock, flags);
1416
1417 /* done */
1418 }
1419
1420 /* how many characters in the buffer */
hso_serial_chars_in_buffer(struct tty_struct * tty)1421 static int hso_serial_chars_in_buffer(struct tty_struct *tty)
1422 {
1423 struct hso_serial *serial = tty->driver_data;
1424 int chars;
1425 unsigned long flags;
1426
1427 /* sanity check */
1428 if (serial == NULL)
1429 return 0;
1430
1431 spin_lock_irqsave(&serial->serial_lock, flags);
1432 chars = serial->tx_buffer_count;
1433 spin_unlock_irqrestore(&serial->serial_lock, flags);
1434
1435 return chars;
1436 }
tiocmget_submit_urb(struct hso_serial * serial,struct hso_tiocmget * tiocmget,struct usb_device * usb)1437 static int tiocmget_submit_urb(struct hso_serial *serial,
1438 struct hso_tiocmget *tiocmget,
1439 struct usb_device *usb)
1440 {
1441 int result;
1442
1443 if (serial->parent->usb_gone)
1444 return -ENODEV;
1445 usb_fill_int_urb(tiocmget->urb, usb,
1446 usb_rcvintpipe(usb,
1447 tiocmget->endp->
1448 bEndpointAddress & 0x7F),
1449 &tiocmget->serial_state_notification,
1450 sizeof(struct hso_serial_state_notification),
1451 tiocmget_intr_callback, serial,
1452 tiocmget->endp->bInterval);
1453 result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC);
1454 if (result) {
1455 dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__,
1456 result);
1457 }
1458 return result;
1459
1460 }
1461
tiocmget_intr_callback(struct urb * urb)1462 static void tiocmget_intr_callback(struct urb *urb)
1463 {
1464 struct hso_serial *serial = urb->context;
1465 struct hso_tiocmget *tiocmget;
1466 int status = urb->status;
1467 u16 UART_state_bitmap, prev_UART_state_bitmap;
1468 struct uart_icount *icount;
1469 struct hso_serial_state_notification *serial_state_notification;
1470 struct usb_device *usb;
1471 struct usb_interface *interface;
1472 int if_num;
1473
1474 /* Sanity checks */
1475 if (!serial)
1476 return;
1477 if (status) {
1478 handle_usb_error(status, __func__, serial->parent);
1479 return;
1480 }
1481
1482 /* tiocmget is only supported on HSO_PORT_MODEM */
1483 tiocmget = serial->tiocmget;
1484 if (!tiocmget)
1485 return;
1486 BUG_ON((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM);
1487
1488 usb = serial->parent->usb;
1489 interface = serial->parent->interface;
1490
1491 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1492
1493 /* wIndex should be the USB interface number of the port to which the
1494 * notification applies, which should always be the Modem port.
1495 */
1496 serial_state_notification = &tiocmget->serial_state_notification;
1497 if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
1498 serial_state_notification->bNotification != B_NOTIFICATION ||
1499 le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
1500 le16_to_cpu(serial_state_notification->wIndex) != if_num ||
1501 le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
1502 dev_warn(&usb->dev,
1503 "hso received invalid serial state notification\n");
1504 DUMP(serial_state_notification,
1505 sizeof(struct hso_serial_state_notification));
1506 } else {
1507 unsigned long flags;
1508
1509 UART_state_bitmap = le16_to_cpu(serial_state_notification->
1510 UART_state_bitmap);
1511 prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap;
1512 icount = &tiocmget->icount;
1513 spin_lock_irqsave(&serial->serial_lock, flags);
1514 if ((UART_state_bitmap & B_OVERRUN) !=
1515 (prev_UART_state_bitmap & B_OVERRUN))
1516 icount->parity++;
1517 if ((UART_state_bitmap & B_PARITY) !=
1518 (prev_UART_state_bitmap & B_PARITY))
1519 icount->parity++;
1520 if ((UART_state_bitmap & B_FRAMING) !=
1521 (prev_UART_state_bitmap & B_FRAMING))
1522 icount->frame++;
1523 if ((UART_state_bitmap & B_RING_SIGNAL) &&
1524 !(prev_UART_state_bitmap & B_RING_SIGNAL))
1525 icount->rng++;
1526 if ((UART_state_bitmap & B_BREAK) !=
1527 (prev_UART_state_bitmap & B_BREAK))
1528 icount->brk++;
1529 if ((UART_state_bitmap & B_TX_CARRIER) !=
1530 (prev_UART_state_bitmap & B_TX_CARRIER))
1531 icount->dsr++;
1532 if ((UART_state_bitmap & B_RX_CARRIER) !=
1533 (prev_UART_state_bitmap & B_RX_CARRIER))
1534 icount->dcd++;
1535 tiocmget->prev_UART_state_bitmap = UART_state_bitmap;
1536 spin_unlock_irqrestore(&serial->serial_lock, flags);
1537 tiocmget->intr_completed = 1;
1538 wake_up_interruptible(&tiocmget->waitq);
1539 }
1540 memset(serial_state_notification, 0,
1541 sizeof(struct hso_serial_state_notification));
1542 tiocmget_submit_urb(serial,
1543 tiocmget,
1544 serial->parent->usb);
1545 }
1546
1547 /*
1548 * next few functions largely stolen from drivers/serial/serial_core.c
1549 */
1550 /* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1551 * - mask passed in arg for lines of interest
1552 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1553 * Caller should use TIOCGICOUNT to see which one it was
1554 */
1555 static int
hso_wait_modem_status(struct hso_serial * serial,unsigned long arg)1556 hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
1557 {
1558 DECLARE_WAITQUEUE(wait, current);
1559 struct uart_icount cprev, cnow;
1560 struct hso_tiocmget *tiocmget;
1561 int ret;
1562
1563 tiocmget = serial->tiocmget;
1564 if (!tiocmget)
1565 return -ENOENT;
1566 /*
1567 * note the counters on entry
1568 */
1569 spin_lock_irq(&serial->serial_lock);
1570 memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount));
1571 spin_unlock_irq(&serial->serial_lock);
1572 add_wait_queue(&tiocmget->waitq, &wait);
1573 for (;;) {
1574 spin_lock_irq(&serial->serial_lock);
1575 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1576 spin_unlock_irq(&serial->serial_lock);
1577 set_current_state(TASK_INTERRUPTIBLE);
1578 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1579 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1580 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd))) {
1581 ret = 0;
1582 break;
1583 }
1584 schedule();
1585 /* see if a signal did it */
1586 if (signal_pending(current)) {
1587 ret = -ERESTARTSYS;
1588 break;
1589 }
1590 cprev = cnow;
1591 }
1592 __set_current_state(TASK_RUNNING);
1593 remove_wait_queue(&tiocmget->waitq, &wait);
1594
1595 return ret;
1596 }
1597
1598 /*
1599 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1600 * Return: write counters to the user passed counter struct
1601 * NB: both 1->0 and 0->1 transitions are counted except for
1602 * RI where only 0->1 is counted.
1603 */
hso_get_count(struct tty_struct * tty,struct serial_icounter_struct * icount)1604 static int hso_get_count(struct tty_struct *tty,
1605 struct serial_icounter_struct *icount)
1606 {
1607 struct uart_icount cnow;
1608 struct hso_serial *serial = tty->driver_data;
1609 struct hso_tiocmget *tiocmget = serial->tiocmget;
1610
1611 memset(icount, 0, sizeof(struct serial_icounter_struct));
1612
1613 if (!tiocmget)
1614 return -ENOENT;
1615 spin_lock_irq(&serial->serial_lock);
1616 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1617 spin_unlock_irq(&serial->serial_lock);
1618
1619 icount->cts = cnow.cts;
1620 icount->dsr = cnow.dsr;
1621 icount->rng = cnow.rng;
1622 icount->dcd = cnow.dcd;
1623 icount->rx = cnow.rx;
1624 icount->tx = cnow.tx;
1625 icount->frame = cnow.frame;
1626 icount->overrun = cnow.overrun;
1627 icount->parity = cnow.parity;
1628 icount->brk = cnow.brk;
1629 icount->buf_overrun = cnow.buf_overrun;
1630
1631 return 0;
1632 }
1633
1634
hso_serial_tiocmget(struct tty_struct * tty)1635 static int hso_serial_tiocmget(struct tty_struct *tty)
1636 {
1637 int retval;
1638 struct hso_serial *serial = tty->driver_data;
1639 struct hso_tiocmget *tiocmget;
1640 u16 UART_state_bitmap;
1641
1642 /* sanity check */
1643 if (!serial) {
1644 hso_dbg(0x1, "no tty structures\n");
1645 return -EINVAL;
1646 }
1647 spin_lock_irq(&serial->serial_lock);
1648 retval = ((serial->rts_state) ? TIOCM_RTS : 0) |
1649 ((serial->dtr_state) ? TIOCM_DTR : 0);
1650 tiocmget = serial->tiocmget;
1651 if (tiocmget) {
1652
1653 UART_state_bitmap = le16_to_cpu(
1654 tiocmget->prev_UART_state_bitmap);
1655 if (UART_state_bitmap & B_RING_SIGNAL)
1656 retval |= TIOCM_RNG;
1657 if (UART_state_bitmap & B_RX_CARRIER)
1658 retval |= TIOCM_CD;
1659 if (UART_state_bitmap & B_TX_CARRIER)
1660 retval |= TIOCM_DSR;
1661 }
1662 spin_unlock_irq(&serial->serial_lock);
1663 return retval;
1664 }
1665
hso_serial_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1666 static int hso_serial_tiocmset(struct tty_struct *tty,
1667 unsigned int set, unsigned int clear)
1668 {
1669 int val = 0;
1670 unsigned long flags;
1671 int if_num;
1672 struct hso_serial *serial = tty->driver_data;
1673 struct usb_interface *interface;
1674
1675 /* sanity check */
1676 if (!serial) {
1677 hso_dbg(0x1, "no tty structures\n");
1678 return -EINVAL;
1679 }
1680
1681 if ((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM)
1682 return -EINVAL;
1683
1684 interface = serial->parent->interface;
1685 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1686
1687 spin_lock_irqsave(&serial->serial_lock, flags);
1688 if (set & TIOCM_RTS)
1689 serial->rts_state = 1;
1690 if (set & TIOCM_DTR)
1691 serial->dtr_state = 1;
1692
1693 if (clear & TIOCM_RTS)
1694 serial->rts_state = 0;
1695 if (clear & TIOCM_DTR)
1696 serial->dtr_state = 0;
1697
1698 if (serial->dtr_state)
1699 val |= 0x01;
1700 if (serial->rts_state)
1701 val |= 0x02;
1702
1703 spin_unlock_irqrestore(&serial->serial_lock, flags);
1704
1705 return usb_control_msg(serial->parent->usb,
1706 usb_rcvctrlpipe(serial->parent->usb, 0), 0x22,
1707 0x21, val, if_num, NULL, 0,
1708 USB_CTRL_SET_TIMEOUT);
1709 }
1710
hso_serial_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)1711 static int hso_serial_ioctl(struct tty_struct *tty,
1712 unsigned int cmd, unsigned long arg)
1713 {
1714 struct hso_serial *serial = tty->driver_data;
1715 int ret = 0;
1716 hso_dbg(0x8, "IOCTL cmd: %d, arg: %ld\n", cmd, arg);
1717
1718 if (!serial)
1719 return -ENODEV;
1720 switch (cmd) {
1721 case TIOCMIWAIT:
1722 ret = hso_wait_modem_status(serial, arg);
1723 break;
1724 default:
1725 ret = -ENOIOCTLCMD;
1726 break;
1727 }
1728 return ret;
1729 }
1730
1731
1732 /* starts a transmit */
hso_kick_transmit(struct hso_serial * serial)1733 static void hso_kick_transmit(struct hso_serial *serial)
1734 {
1735 unsigned long flags;
1736 int res;
1737
1738 spin_lock_irqsave(&serial->serial_lock, flags);
1739 if (!serial->tx_buffer_count)
1740 goto out;
1741
1742 if (serial->tx_urb_used)
1743 goto out;
1744
1745 /* Wakeup USB interface if necessary */
1746 if (hso_get_activity(serial->parent) == -EAGAIN)
1747 goto out;
1748
1749 /* Switch pointers around to avoid memcpy */
1750 swap(serial->tx_buffer, serial->tx_data);
1751 serial->tx_data_count = serial->tx_buffer_count;
1752 serial->tx_buffer_count = 0;
1753
1754 /* If serial->tx_data is set, it means we switched buffers */
1755 if (serial->tx_data && serial->write_data) {
1756 res = serial->write_data(serial);
1757 if (res >= 0)
1758 serial->tx_urb_used = 1;
1759 }
1760 out:
1761 spin_unlock_irqrestore(&serial->serial_lock, flags);
1762 }
1763
1764 /* 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)1765 static int mux_device_request(struct hso_serial *serial, u8 type, u16 port,
1766 struct urb *ctrl_urb,
1767 struct usb_ctrlrequest *ctrl_req,
1768 u8 *ctrl_urb_data, u32 size)
1769 {
1770 int result;
1771 int pipe;
1772
1773 /* Sanity check */
1774 if (!serial || !ctrl_urb || !ctrl_req) {
1775 pr_err("%s: Wrong arguments\n", __func__);
1776 return -EINVAL;
1777 }
1778
1779 /* initialize */
1780 ctrl_req->wValue = 0;
1781 ctrl_req->wIndex = cpu_to_le16(hso_port_to_mux(port));
1782 ctrl_req->wLength = cpu_to_le16(size);
1783
1784 if (type == USB_CDC_GET_ENCAPSULATED_RESPONSE) {
1785 /* Reading command */
1786 ctrl_req->bRequestType = USB_DIR_IN |
1787 USB_TYPE_OPTION_VENDOR |
1788 USB_RECIP_INTERFACE;
1789 ctrl_req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
1790 pipe = usb_rcvctrlpipe(serial->parent->usb, 0);
1791 } else {
1792 /* Writing command */
1793 ctrl_req->bRequestType = USB_DIR_OUT |
1794 USB_TYPE_OPTION_VENDOR |
1795 USB_RECIP_INTERFACE;
1796 ctrl_req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
1797 pipe = usb_sndctrlpipe(serial->parent->usb, 0);
1798 }
1799 /* syslog */
1800 hso_dbg(0x2, "%s command (%02x) len: %d, port: %d\n",
1801 type == USB_CDC_GET_ENCAPSULATED_RESPONSE ? "Read" : "Write",
1802 ctrl_req->bRequestType, ctrl_req->wLength, port);
1803
1804 /* Load ctrl urb */
1805 ctrl_urb->transfer_flags = 0;
1806 usb_fill_control_urb(ctrl_urb,
1807 serial->parent->usb,
1808 pipe,
1809 (u8 *) ctrl_req,
1810 ctrl_urb_data, size, ctrl_callback, serial);
1811 /* Send it on merry way */
1812 result = usb_submit_urb(ctrl_urb, GFP_ATOMIC);
1813 if (result) {
1814 dev_err(&ctrl_urb->dev->dev,
1815 "%s failed submit ctrl_urb %d type %d\n", __func__,
1816 result, type);
1817 return result;
1818 }
1819
1820 /* done */
1821 return size;
1822 }
1823
1824 /* called by intr_callback when read occurs */
hso_mux_serial_read(struct hso_serial * serial)1825 static int hso_mux_serial_read(struct hso_serial *serial)
1826 {
1827 if (!serial)
1828 return -EINVAL;
1829
1830 /* clean data */
1831 memset(serial->rx_data[0], 0, CTRL_URB_RX_SIZE);
1832 /* make the request */
1833
1834 if (serial->num_rx_urbs != 1) {
1835 dev_err(&serial->parent->interface->dev,
1836 "ERROR: mux'd reads with multiple buffers "
1837 "not possible\n");
1838 return 0;
1839 }
1840 return mux_device_request(serial,
1841 USB_CDC_GET_ENCAPSULATED_RESPONSE,
1842 serial->parent->port_spec & HSO_PORT_MASK,
1843 serial->rx_urb[0],
1844 &serial->ctrl_req_rx,
1845 serial->rx_data[0], serial->rx_data_length);
1846 }
1847
1848 /* used for muxed serial port callback (muxed serial read) */
intr_callback(struct urb * urb)1849 static void intr_callback(struct urb *urb)
1850 {
1851 struct hso_shared_int *shared_int = urb->context;
1852 struct hso_serial *serial;
1853 unsigned char *port_req;
1854 int status = urb->status;
1855 unsigned long flags;
1856 int i;
1857
1858 usb_mark_last_busy(urb->dev);
1859
1860 /* sanity check */
1861 if (!shared_int)
1862 return;
1863
1864 /* status check */
1865 if (status) {
1866 handle_usb_error(status, __func__, NULL);
1867 return;
1868 }
1869 hso_dbg(0x8, "--- Got intr callback 0x%02X ---\n", status);
1870
1871 /* what request? */
1872 port_req = urb->transfer_buffer;
1873 hso_dbg(0x8, "port_req = 0x%.2X\n", *port_req);
1874 /* loop over all muxed ports to find the one sending this */
1875 for (i = 0; i < 8; i++) {
1876 /* max 8 channels on MUX */
1877 if (*port_req & (1 << i)) {
1878 serial = get_serial_by_shared_int_and_type(shared_int,
1879 (1 << i));
1880 if (serial != NULL) {
1881 hso_dbg(0x1, "Pending read interrupt on port %d\n",
1882 i);
1883 spin_lock_irqsave(&serial->serial_lock, flags);
1884 if (serial->rx_state == RX_IDLE &&
1885 serial->port.count > 0) {
1886 /* Setup and send a ctrl req read on
1887 * port i */
1888 if (!serial->rx_urb_filled[0]) {
1889 serial->rx_state = RX_SENT;
1890 hso_mux_serial_read(serial);
1891 } else
1892 serial->rx_state = RX_PENDING;
1893 } else {
1894 hso_dbg(0x1, "Already a read pending on port %d or port not open\n",
1895 i);
1896 }
1897 spin_unlock_irqrestore(&serial->serial_lock,
1898 flags);
1899 }
1900 }
1901 }
1902 /* Resubmit interrupt urb */
1903 hso_mux_submit_intr_urb(shared_int, urb->dev, GFP_ATOMIC);
1904 }
1905
1906 /* called for writing to muxed serial port */
hso_mux_serial_write_data(struct hso_serial * serial)1907 static int hso_mux_serial_write_data(struct hso_serial *serial)
1908 {
1909 if (NULL == serial)
1910 return -EINVAL;
1911
1912 return mux_device_request(serial,
1913 USB_CDC_SEND_ENCAPSULATED_COMMAND,
1914 serial->parent->port_spec & HSO_PORT_MASK,
1915 serial->tx_urb,
1916 &serial->ctrl_req_tx,
1917 serial->tx_data, serial->tx_data_count);
1918 }
1919
1920 /* write callback for Diag and CS port */
hso_std_serial_write_bulk_callback(struct urb * urb)1921 static void hso_std_serial_write_bulk_callback(struct urb *urb)
1922 {
1923 struct hso_serial *serial = urb->context;
1924 int status = urb->status;
1925 unsigned long flags;
1926
1927 /* sanity check */
1928 if (!serial) {
1929 hso_dbg(0x1, "serial == NULL\n");
1930 return;
1931 }
1932
1933 spin_lock_irqsave(&serial->serial_lock, flags);
1934 serial->tx_urb_used = 0;
1935 spin_unlock_irqrestore(&serial->serial_lock, flags);
1936 if (status) {
1937 handle_usb_error(status, __func__, serial->parent);
1938 return;
1939 }
1940 hso_put_activity(serial->parent);
1941 tty_port_tty_wakeup(&serial->port);
1942 hso_kick_transmit(serial);
1943
1944 hso_dbg(0x1, "\n");
1945 }
1946
1947 /* called for writing diag or CS serial port */
hso_std_serial_write_data(struct hso_serial * serial)1948 static int hso_std_serial_write_data(struct hso_serial *serial)
1949 {
1950 int count = serial->tx_data_count;
1951 int result;
1952
1953 usb_fill_bulk_urb(serial->tx_urb,
1954 serial->parent->usb,
1955 usb_sndbulkpipe(serial->parent->usb,
1956 serial->out_endp->
1957 bEndpointAddress & 0x7F),
1958 serial->tx_data, serial->tx_data_count,
1959 hso_std_serial_write_bulk_callback, serial);
1960
1961 result = usb_submit_urb(serial->tx_urb, GFP_ATOMIC);
1962 if (result) {
1963 dev_warn(&serial->parent->usb->dev,
1964 "Failed to submit urb - res %d\n", result);
1965 return result;
1966 }
1967
1968 return count;
1969 }
1970
1971 /* callback after read or write on muxed serial port */
ctrl_callback(struct urb * urb)1972 static void ctrl_callback(struct urb *urb)
1973 {
1974 struct hso_serial *serial = urb->context;
1975 struct usb_ctrlrequest *req;
1976 int status = urb->status;
1977 unsigned long flags;
1978
1979 /* sanity check */
1980 if (!serial)
1981 return;
1982
1983 spin_lock_irqsave(&serial->serial_lock, flags);
1984 serial->tx_urb_used = 0;
1985 spin_unlock_irqrestore(&serial->serial_lock, flags);
1986 if (status) {
1987 handle_usb_error(status, __func__, serial->parent);
1988 return;
1989 }
1990
1991 /* what request? */
1992 req = (struct usb_ctrlrequest *)(urb->setup_packet);
1993 hso_dbg(0x8, "--- Got muxed ctrl callback 0x%02X ---\n", status);
1994 hso_dbg(0x8, "Actual length of urb = %d\n", urb->actual_length);
1995 DUMP1(urb->transfer_buffer, urb->actual_length);
1996
1997 if (req->bRequestType ==
1998 (USB_DIR_IN | USB_TYPE_OPTION_VENDOR | USB_RECIP_INTERFACE)) {
1999 /* response to a read command */
2000 serial->rx_urb_filled[0] = 1;
2001 spin_lock_irqsave(&serial->serial_lock, flags);
2002 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
2003 spin_unlock_irqrestore(&serial->serial_lock, flags);
2004 } else {
2005 hso_put_activity(serial->parent);
2006 tty_port_tty_wakeup(&serial->port);
2007 /* response to a write command */
2008 hso_kick_transmit(serial);
2009 }
2010 }
2011
2012 /* handle RX data for serial port */
put_rxbuf_data(struct urb * urb,struct hso_serial * serial)2013 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
2014 {
2015 struct tty_struct *tty;
2016 int count;
2017
2018 /* Sanity check */
2019 if (urb == NULL || serial == NULL) {
2020 hso_dbg(0x1, "serial = NULL\n");
2021 return -2;
2022 }
2023
2024 tty = tty_port_tty_get(&serial->port);
2025
2026 if (tty && tty_throttled(tty)) {
2027 tty_kref_put(tty);
2028 return -1;
2029 }
2030
2031 /* Push data to tty */
2032 hso_dbg(0x1, "data to push to tty\n");
2033 count = tty_buffer_request_room(&serial->port, urb->actual_length);
2034 if (count >= urb->actual_length) {
2035 tty_insert_flip_string(&serial->port, urb->transfer_buffer,
2036 urb->actual_length);
2037 tty_flip_buffer_push(&serial->port);
2038 } else {
2039 dev_warn(&serial->parent->usb->dev,
2040 "dropping data, %d bytes lost\n", urb->actual_length);
2041 }
2042
2043 tty_kref_put(tty);
2044
2045 serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0;
2046
2047 return 0;
2048 }
2049
2050
2051 /* Base driver functions */
2052
hso_log_port(struct hso_device * hso_dev)2053 static void hso_log_port(struct hso_device *hso_dev)
2054 {
2055 char *port_type;
2056 char port_dev[20];
2057
2058 switch (hso_dev->port_spec & HSO_PORT_MASK) {
2059 case HSO_PORT_CONTROL:
2060 port_type = "Control";
2061 break;
2062 case HSO_PORT_APP:
2063 port_type = "Application";
2064 break;
2065 case HSO_PORT_GPS:
2066 port_type = "GPS";
2067 break;
2068 case HSO_PORT_GPS_CONTROL:
2069 port_type = "GPS control";
2070 break;
2071 case HSO_PORT_APP2:
2072 port_type = "Application2";
2073 break;
2074 case HSO_PORT_PCSC:
2075 port_type = "PCSC";
2076 break;
2077 case HSO_PORT_DIAG:
2078 port_type = "Diagnostic";
2079 break;
2080 case HSO_PORT_DIAG2:
2081 port_type = "Diagnostic2";
2082 break;
2083 case HSO_PORT_MODEM:
2084 port_type = "Modem";
2085 break;
2086 case HSO_PORT_NETWORK:
2087 port_type = "Network";
2088 break;
2089 default:
2090 port_type = "Unknown";
2091 break;
2092 }
2093 if ((hso_dev->port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2094 sprintf(port_dev, "%s", dev2net(hso_dev)->net->name);
2095 } else
2096 sprintf(port_dev, "/dev/%s%d", tty_filename,
2097 dev2ser(hso_dev)->minor);
2098
2099 dev_dbg(&hso_dev->interface->dev, "HSO: Found %s port %s\n",
2100 port_type, port_dev);
2101 }
2102
hso_start_net_device(struct hso_device * hso_dev)2103 static int hso_start_net_device(struct hso_device *hso_dev)
2104 {
2105 int i, result = 0;
2106 struct hso_net *hso_net = dev2net(hso_dev);
2107
2108 if (!hso_net)
2109 return -ENODEV;
2110
2111 /* send URBs for all read buffers */
2112 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2113
2114 /* Prep a receive URB */
2115 usb_fill_bulk_urb(hso_net->mux_bulk_rx_urb_pool[i],
2116 hso_dev->usb,
2117 usb_rcvbulkpipe(hso_dev->usb,
2118 hso_net->in_endp->
2119 bEndpointAddress & 0x7F),
2120 hso_net->mux_bulk_rx_buf_pool[i],
2121 MUX_BULK_RX_BUF_SIZE, read_bulk_callback,
2122 hso_net);
2123
2124 /* Put it out there so the device can send us stuff */
2125 result = usb_submit_urb(hso_net->mux_bulk_rx_urb_pool[i],
2126 GFP_NOIO);
2127 if (result)
2128 dev_warn(&hso_dev->usb->dev,
2129 "%s failed mux_bulk_rx_urb[%d] %d\n", __func__,
2130 i, result);
2131 }
2132
2133 return result;
2134 }
2135
hso_stop_net_device(struct hso_device * hso_dev)2136 static int hso_stop_net_device(struct hso_device *hso_dev)
2137 {
2138 int i;
2139 struct hso_net *hso_net = dev2net(hso_dev);
2140
2141 if (!hso_net)
2142 return -ENODEV;
2143
2144 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2145 if (hso_net->mux_bulk_rx_urb_pool[i])
2146 usb_kill_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2147
2148 }
2149 if (hso_net->mux_bulk_tx_urb)
2150 usb_kill_urb(hso_net->mux_bulk_tx_urb);
2151
2152 return 0;
2153 }
2154
hso_start_serial_device(struct hso_device * hso_dev,gfp_t flags)2155 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags)
2156 {
2157 int i, result = 0;
2158 struct hso_serial *serial = dev2ser(hso_dev);
2159
2160 if (!serial)
2161 return -ENODEV;
2162
2163 /* If it is not the MUX port fill in and submit a bulk urb (already
2164 * allocated in hso_serial_start) */
2165 if (!(serial->parent->port_spec & HSO_INTF_MUX)) {
2166 for (i = 0; i < serial->num_rx_urbs; i++) {
2167 usb_fill_bulk_urb(serial->rx_urb[i],
2168 serial->parent->usb,
2169 usb_rcvbulkpipe(serial->parent->usb,
2170 serial->in_endp->
2171 bEndpointAddress &
2172 0x7F),
2173 serial->rx_data[i],
2174 serial->rx_data_length,
2175 hso_std_serial_read_bulk_callback,
2176 serial);
2177 result = usb_submit_urb(serial->rx_urb[i], flags);
2178 if (result) {
2179 dev_warn(&serial->parent->usb->dev,
2180 "Failed to submit urb - res %d\n",
2181 result);
2182 break;
2183 }
2184 }
2185 } else {
2186 mutex_lock(&serial->shared_int->shared_int_lock);
2187 if (!serial->shared_int->use_count) {
2188 result =
2189 hso_mux_submit_intr_urb(serial->shared_int,
2190 hso_dev->usb, flags);
2191 }
2192 serial->shared_int->use_count++;
2193 mutex_unlock(&serial->shared_int->shared_int_lock);
2194 }
2195 if (serial->tiocmget)
2196 tiocmget_submit_urb(serial,
2197 serial->tiocmget,
2198 serial->parent->usb);
2199 return result;
2200 }
2201
hso_stop_serial_device(struct hso_device * hso_dev)2202 static int hso_stop_serial_device(struct hso_device *hso_dev)
2203 {
2204 int i;
2205 struct hso_serial *serial = dev2ser(hso_dev);
2206 struct hso_tiocmget *tiocmget;
2207
2208 if (!serial)
2209 return -ENODEV;
2210
2211 for (i = 0; i < serial->num_rx_urbs; i++) {
2212 if (serial->rx_urb[i]) {
2213 usb_kill_urb(serial->rx_urb[i]);
2214 serial->rx_urb_filled[i] = 0;
2215 }
2216 }
2217 serial->curr_rx_urb_idx = 0;
2218
2219 if (serial->tx_urb)
2220 usb_kill_urb(serial->tx_urb);
2221
2222 if (serial->shared_int) {
2223 mutex_lock(&serial->shared_int->shared_int_lock);
2224 if (serial->shared_int->use_count &&
2225 (--serial->shared_int->use_count == 0)) {
2226 struct urb *urb;
2227
2228 urb = serial->shared_int->shared_intr_urb;
2229 if (urb)
2230 usb_kill_urb(urb);
2231 }
2232 mutex_unlock(&serial->shared_int->shared_int_lock);
2233 }
2234 tiocmget = serial->tiocmget;
2235 if (tiocmget) {
2236 wake_up_interruptible(&tiocmget->waitq);
2237 usb_kill_urb(tiocmget->urb);
2238 }
2239
2240 return 0;
2241 }
2242
hso_serial_tty_unregister(struct hso_serial * serial)2243 static void hso_serial_tty_unregister(struct hso_serial *serial)
2244 {
2245 tty_unregister_device(tty_drv, serial->minor);
2246 }
2247
hso_serial_common_free(struct hso_serial * serial)2248 static void hso_serial_common_free(struct hso_serial *serial)
2249 {
2250 int i;
2251
2252 for (i = 0; i < serial->num_rx_urbs; i++) {
2253 /* unlink and free RX URB */
2254 usb_free_urb(serial->rx_urb[i]);
2255 /* free the RX buffer */
2256 kfree(serial->rx_data[i]);
2257 }
2258
2259 /* unlink and free TX URB */
2260 usb_free_urb(serial->tx_urb);
2261 kfree(serial->tx_buffer);
2262 kfree(serial->tx_data);
2263 tty_port_destroy(&serial->port);
2264 }
2265
hso_serial_common_create(struct hso_serial * serial,int num_urbs,int rx_size,int tx_size)2266 static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
2267 int rx_size, int tx_size)
2268 {
2269 int minor;
2270 int i;
2271
2272 tty_port_init(&serial->port);
2273
2274 minor = get_free_serial_index();
2275 if (minor < 0)
2276 goto exit;
2277
2278 /* register our minor number */
2279 serial->parent->dev = tty_port_register_device_attr(&serial->port,
2280 tty_drv, minor, &serial->parent->interface->dev,
2281 serial->parent, hso_serial_dev_groups);
2282
2283 /* fill in specific data for later use */
2284 serial->minor = minor;
2285 serial->magic = HSO_SERIAL_MAGIC;
2286 spin_lock_init(&serial->serial_lock);
2287 serial->num_rx_urbs = num_urbs;
2288
2289 /* RX, allocate urb and initialize */
2290
2291 /* prepare our RX buffer */
2292 serial->rx_data_length = rx_size;
2293 for (i = 0; i < serial->num_rx_urbs; i++) {
2294 serial->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
2295 if (!serial->rx_urb[i])
2296 goto exit;
2297 serial->rx_urb[i]->transfer_buffer = NULL;
2298 serial->rx_urb[i]->transfer_buffer_length = 0;
2299 serial->rx_data[i] = kzalloc(serial->rx_data_length,
2300 GFP_KERNEL);
2301 if (!serial->rx_data[i])
2302 goto exit;
2303 }
2304
2305 /* TX, allocate urb and initialize */
2306 serial->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2307 if (!serial->tx_urb)
2308 goto exit;
2309 serial->tx_urb->transfer_buffer = NULL;
2310 serial->tx_urb->transfer_buffer_length = 0;
2311 /* prepare our TX buffer */
2312 serial->tx_data_count = 0;
2313 serial->tx_buffer_count = 0;
2314 serial->tx_data_length = tx_size;
2315 serial->tx_data = kzalloc(serial->tx_data_length, GFP_KERNEL);
2316 if (!serial->tx_data)
2317 goto exit;
2318
2319 serial->tx_buffer = kzalloc(serial->tx_data_length, GFP_KERNEL);
2320 if (!serial->tx_buffer)
2321 goto exit;
2322
2323 return 0;
2324 exit:
2325 hso_serial_tty_unregister(serial);
2326 hso_serial_common_free(serial);
2327 return -1;
2328 }
2329
2330 /* Creates a general hso device */
hso_create_device(struct usb_interface * intf,int port_spec)2331 static struct hso_device *hso_create_device(struct usb_interface *intf,
2332 int port_spec)
2333 {
2334 struct hso_device *hso_dev;
2335
2336 hso_dev = kzalloc(sizeof(*hso_dev), GFP_ATOMIC);
2337 if (!hso_dev)
2338 return NULL;
2339
2340 hso_dev->port_spec = port_spec;
2341 hso_dev->usb = interface_to_usbdev(intf);
2342 hso_dev->interface = intf;
2343 kref_init(&hso_dev->ref);
2344 mutex_init(&hso_dev->mutex);
2345
2346 INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
2347 INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
2348
2349 return hso_dev;
2350 }
2351
2352 /* Removes a network device in the network device table */
remove_net_device(struct hso_device * hso_dev)2353 static int remove_net_device(struct hso_device *hso_dev)
2354 {
2355 int i;
2356
2357 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2358 if (network_table[i] == hso_dev) {
2359 network_table[i] = NULL;
2360 break;
2361 }
2362 }
2363 if (i == HSO_MAX_NET_DEVICES)
2364 return -1;
2365 return 0;
2366 }
2367
2368 /* Frees our network device */
hso_free_net_device(struct hso_device * hso_dev)2369 static void hso_free_net_device(struct hso_device *hso_dev)
2370 {
2371 int i;
2372 struct hso_net *hso_net = dev2net(hso_dev);
2373
2374 if (!hso_net)
2375 return;
2376
2377 remove_net_device(hso_net->parent);
2378
2379 if (hso_net->net)
2380 unregister_netdev(hso_net->net);
2381
2382 /* start freeing */
2383 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2384 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2385 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2386 hso_net->mux_bulk_rx_buf_pool[i] = NULL;
2387 }
2388 usb_free_urb(hso_net->mux_bulk_tx_urb);
2389 kfree(hso_net->mux_bulk_tx_buf);
2390 hso_net->mux_bulk_tx_buf = NULL;
2391
2392 if (hso_net->net)
2393 free_netdev(hso_net->net);
2394
2395 kfree(hso_dev);
2396 }
2397
2398 static const struct net_device_ops hso_netdev_ops = {
2399 .ndo_open = hso_net_open,
2400 .ndo_stop = hso_net_close,
2401 .ndo_start_xmit = hso_net_start_xmit,
2402 .ndo_tx_timeout = hso_net_tx_timeout,
2403 };
2404
2405 /* initialize the network interface */
hso_net_init(struct net_device * net)2406 static void hso_net_init(struct net_device *net)
2407 {
2408 struct hso_net *hso_net = netdev_priv(net);
2409
2410 hso_dbg(0x1, "sizeof hso_net is %zu\n", sizeof(*hso_net));
2411
2412 /* fill in the other fields */
2413 net->netdev_ops = &hso_netdev_ops;
2414 net->watchdog_timeo = HSO_NET_TX_TIMEOUT;
2415 net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2416 net->type = ARPHRD_NONE;
2417 net->mtu = DEFAULT_MTU - 14;
2418 net->tx_queue_len = 10;
2419 net->ethtool_ops = &ops;
2420
2421 /* and initialize the semaphore */
2422 spin_lock_init(&hso_net->net_lock);
2423 }
2424
2425 /* Adds a network device in the network device table */
add_net_device(struct hso_device * hso_dev)2426 static int add_net_device(struct hso_device *hso_dev)
2427 {
2428 int i;
2429
2430 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2431 if (network_table[i] == NULL) {
2432 network_table[i] = hso_dev;
2433 break;
2434 }
2435 }
2436 if (i == HSO_MAX_NET_DEVICES)
2437 return -1;
2438 return 0;
2439 }
2440
hso_rfkill_set_block(void * data,bool blocked)2441 static int hso_rfkill_set_block(void *data, bool blocked)
2442 {
2443 struct hso_device *hso_dev = data;
2444 int enabled = !blocked;
2445 int rv;
2446
2447 mutex_lock(&hso_dev->mutex);
2448 if (hso_dev->usb_gone)
2449 rv = 0;
2450 else
2451 rv = usb_control_msg(hso_dev->usb, usb_rcvctrlpipe(hso_dev->usb, 0),
2452 enabled ? 0x82 : 0x81, 0x40, 0, 0, NULL, 0,
2453 USB_CTRL_SET_TIMEOUT);
2454 mutex_unlock(&hso_dev->mutex);
2455 return rv;
2456 }
2457
2458 static const struct rfkill_ops hso_rfkill_ops = {
2459 .set_block = hso_rfkill_set_block,
2460 };
2461
2462 /* Creates and sets up everything for rfkill */
hso_create_rfkill(struct hso_device * hso_dev,struct usb_interface * interface)2463 static void hso_create_rfkill(struct hso_device *hso_dev,
2464 struct usb_interface *interface)
2465 {
2466 struct hso_net *hso_net = dev2net(hso_dev);
2467 struct device *dev = &hso_net->net->dev;
2468 static u32 rfkill_counter;
2469
2470 snprintf(hso_net->name, sizeof(hso_net->name), "hso-%d",
2471 rfkill_counter++);
2472
2473 hso_net->rfkill = rfkill_alloc(hso_net->name,
2474 &interface_to_usbdev(interface)->dev,
2475 RFKILL_TYPE_WWAN,
2476 &hso_rfkill_ops, hso_dev);
2477 if (!hso_net->rfkill) {
2478 dev_err(dev, "%s - Out of memory\n", __func__);
2479 return;
2480 }
2481 if (rfkill_register(hso_net->rfkill) < 0) {
2482 rfkill_destroy(hso_net->rfkill);
2483 hso_net->rfkill = NULL;
2484 dev_err(dev, "%s - Failed to register rfkill\n", __func__);
2485 return;
2486 }
2487 }
2488
2489 static struct device_type hso_type = {
2490 .name = "wwan",
2491 };
2492
2493 /* Creates our network device */
hso_create_net_device(struct usb_interface * interface,int port_spec)2494 static struct hso_device *hso_create_net_device(struct usb_interface *interface,
2495 int port_spec)
2496 {
2497 int result, i;
2498 struct net_device *net;
2499 struct hso_net *hso_net;
2500 struct hso_device *hso_dev;
2501
2502 hso_dev = hso_create_device(interface, port_spec);
2503 if (!hso_dev)
2504 return NULL;
2505
2506 /* allocate our network device, then we can put in our private data */
2507 /* call hso_net_init to do the basic initialization */
2508 net = alloc_netdev(sizeof(struct hso_net), "hso%d", NET_NAME_UNKNOWN,
2509 hso_net_init);
2510 if (!net) {
2511 dev_err(&interface->dev, "Unable to create ethernet device\n");
2512 goto exit;
2513 }
2514
2515 hso_net = netdev_priv(net);
2516
2517 hso_dev->port_data.dev_net = hso_net;
2518 hso_net->net = net;
2519 hso_net->parent = hso_dev;
2520
2521 hso_net->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2522 USB_DIR_IN);
2523 if (!hso_net->in_endp) {
2524 dev_err(&interface->dev, "Can't find BULK IN endpoint\n");
2525 goto exit;
2526 }
2527 hso_net->out_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2528 USB_DIR_OUT);
2529 if (!hso_net->out_endp) {
2530 dev_err(&interface->dev, "Can't find BULK OUT endpoint\n");
2531 goto exit;
2532 }
2533 SET_NETDEV_DEV(net, &interface->dev);
2534 SET_NETDEV_DEVTYPE(net, &hso_type);
2535
2536 /* start allocating */
2537 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2538 hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
2539 if (!hso_net->mux_bulk_rx_urb_pool[i])
2540 goto exit;
2541 hso_net->mux_bulk_rx_buf_pool[i] = kzalloc(MUX_BULK_RX_BUF_SIZE,
2542 GFP_KERNEL);
2543 if (!hso_net->mux_bulk_rx_buf_pool[i])
2544 goto exit;
2545 }
2546 hso_net->mux_bulk_tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2547 if (!hso_net->mux_bulk_tx_urb)
2548 goto exit;
2549 hso_net->mux_bulk_tx_buf = kzalloc(MUX_BULK_TX_BUF_SIZE, GFP_KERNEL);
2550 if (!hso_net->mux_bulk_tx_buf)
2551 goto exit;
2552
2553 add_net_device(hso_dev);
2554
2555 /* registering our net device */
2556 result = register_netdev(net);
2557 if (result) {
2558 dev_err(&interface->dev, "Failed to register device\n");
2559 goto exit;
2560 }
2561
2562 hso_log_port(hso_dev);
2563
2564 hso_create_rfkill(hso_dev, interface);
2565
2566 return hso_dev;
2567 exit:
2568 hso_free_net_device(hso_dev);
2569 return NULL;
2570 }
2571
hso_free_tiomget(struct hso_serial * serial)2572 static void hso_free_tiomget(struct hso_serial *serial)
2573 {
2574 struct hso_tiocmget *tiocmget;
2575 if (!serial)
2576 return;
2577 tiocmget = serial->tiocmget;
2578 if (tiocmget) {
2579 usb_free_urb(tiocmget->urb);
2580 tiocmget->urb = NULL;
2581 serial->tiocmget = 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 /* it isn't going to break our heart if serial->tiocmget
2633 * allocation fails don't bother checking this.
2634 */
2635 if (serial->tiocmget) {
2636 tiocmget = serial->tiocmget;
2637 tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
2638 if (tiocmget->urb) {
2639 mutex_init(&tiocmget->mutex);
2640 init_waitqueue_head(&tiocmget->waitq);
2641 tiocmget->endp = hso_get_ep(
2642 interface,
2643 USB_ENDPOINT_XFER_INT,
2644 USB_DIR_IN);
2645 } else
2646 hso_free_tiomget(serial);
2647 }
2648 }
2649 else
2650 num_urbs = 1;
2651
2652 if (hso_serial_common_create(serial, num_urbs, BULK_URB_RX_SIZE,
2653 BULK_URB_TX_SIZE))
2654 goto exit;
2655
2656 serial->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2657 USB_DIR_IN);
2658 if (!serial->in_endp) {
2659 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2660 goto exit2;
2661 }
2662
2663 if (!
2664 (serial->out_endp =
2665 hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT))) {
2666 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2667 goto exit2;
2668 }
2669
2670 serial->write_data = hso_std_serial_write_data;
2671
2672 /* and record this serial */
2673 set_serial_by_index(serial->minor, serial);
2674
2675 /* setup the proc dirs and files if needed */
2676 hso_log_port(hso_dev);
2677
2678 /* done, return it */
2679 return hso_dev;
2680
2681 exit2:
2682 hso_serial_tty_unregister(serial);
2683 hso_serial_common_free(serial);
2684 exit:
2685 hso_free_tiomget(serial);
2686 kfree(serial);
2687 kfree(hso_dev);
2688 return NULL;
2689 }
2690
2691 /* Creates a multiplexed AT channel */
2692 static
hso_create_mux_serial_device(struct usb_interface * interface,int port,struct hso_shared_int * mux)2693 struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface,
2694 int port,
2695 struct hso_shared_int *mux)
2696 {
2697 struct hso_device *hso_dev;
2698 struct hso_serial *serial;
2699 int port_spec;
2700
2701 port_spec = HSO_INTF_MUX;
2702 port_spec &= ~HSO_PORT_MASK;
2703
2704 port_spec |= hso_mux_to_port(port);
2705 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NO_PORT)
2706 return NULL;
2707
2708 hso_dev = hso_create_device(interface, port_spec);
2709 if (!hso_dev)
2710 return NULL;
2711
2712 serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2713 if (!serial)
2714 goto exit;
2715
2716 hso_dev->port_data.dev_serial = serial;
2717 serial->parent = hso_dev;
2718
2719 if (hso_serial_common_create
2720 (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE))
2721 goto exit;
2722
2723 serial->tx_data_length--;
2724 serial->write_data = hso_mux_serial_write_data;
2725
2726 serial->shared_int = mux;
2727 mutex_lock(&serial->shared_int->shared_int_lock);
2728 serial->shared_int->ref_count++;
2729 mutex_unlock(&serial->shared_int->shared_int_lock);
2730
2731 /* and record this serial */
2732 set_serial_by_index(serial->minor, serial);
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 exit:
2741 if (serial) {
2742 tty_unregister_device(tty_drv, serial->minor);
2743 kfree(serial);
2744 }
2745 kfree(hso_dev);
2746 return NULL;
2747
2748 }
2749
hso_free_shared_int(struct hso_shared_int * mux)2750 static void hso_free_shared_int(struct hso_shared_int *mux)
2751 {
2752 usb_free_urb(mux->shared_intr_urb);
2753 kfree(mux->shared_intr_buf);
2754 mutex_unlock(&mux->shared_int_lock);
2755 kfree(mux);
2756 }
2757
2758 static
hso_create_shared_int(struct usb_interface * interface)2759 struct hso_shared_int *hso_create_shared_int(struct usb_interface *interface)
2760 {
2761 struct hso_shared_int *mux = kzalloc(sizeof(*mux), GFP_KERNEL);
2762
2763 if (!mux)
2764 return NULL;
2765
2766 mux->intr_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT,
2767 USB_DIR_IN);
2768 if (!mux->intr_endp) {
2769 dev_err(&interface->dev, "Can't find INT IN endpoint\n");
2770 goto exit;
2771 }
2772
2773 mux->shared_intr_urb = usb_alloc_urb(0, GFP_KERNEL);
2774 if (!mux->shared_intr_urb)
2775 goto exit;
2776 mux->shared_intr_buf =
2777 kzalloc(le16_to_cpu(mux->intr_endp->wMaxPacketSize),
2778 GFP_KERNEL);
2779 if (!mux->shared_intr_buf)
2780 goto exit;
2781
2782 mutex_init(&mux->shared_int_lock);
2783
2784 return mux;
2785
2786 exit:
2787 kfree(mux->shared_intr_buf);
2788 usb_free_urb(mux->shared_intr_urb);
2789 kfree(mux);
2790 return NULL;
2791 }
2792
2793 /* Gets the port spec for a certain interface */
hso_get_config_data(struct usb_interface * interface)2794 static int hso_get_config_data(struct usb_interface *interface)
2795 {
2796 struct usb_device *usbdev = interface_to_usbdev(interface);
2797 u8 *config_data = kmalloc(17, GFP_KERNEL);
2798 u32 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2799 s32 result;
2800
2801 if (!config_data)
2802 return -ENOMEM;
2803 if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
2804 0x86, 0xC0, 0, 0, config_data, 17,
2805 USB_CTRL_SET_TIMEOUT) != 0x11) {
2806 kfree(config_data);
2807 return -EIO;
2808 }
2809
2810 switch (config_data[if_num]) {
2811 case 0x0:
2812 result = 0;
2813 break;
2814 case 0x1:
2815 result = HSO_PORT_DIAG;
2816 break;
2817 case 0x2:
2818 result = HSO_PORT_GPS;
2819 break;
2820 case 0x3:
2821 result = HSO_PORT_GPS_CONTROL;
2822 break;
2823 case 0x4:
2824 result = HSO_PORT_APP;
2825 break;
2826 case 0x5:
2827 result = HSO_PORT_APP2;
2828 break;
2829 case 0x6:
2830 result = HSO_PORT_CONTROL;
2831 break;
2832 case 0x7:
2833 result = HSO_PORT_NETWORK;
2834 break;
2835 case 0x8:
2836 result = HSO_PORT_MODEM;
2837 break;
2838 case 0x9:
2839 result = HSO_PORT_MSD;
2840 break;
2841 case 0xa:
2842 result = HSO_PORT_PCSC;
2843 break;
2844 case 0xb:
2845 result = HSO_PORT_VOICE;
2846 break;
2847 default:
2848 result = 0;
2849 }
2850
2851 if (result)
2852 result |= HSO_INTF_BULK;
2853
2854 if (config_data[16] & 0x1)
2855 result |= HSO_INFO_CRC_BUG;
2856
2857 kfree(config_data);
2858 return result;
2859 }
2860
2861 /* called once for each interface upon device insertion */
hso_probe(struct usb_interface * interface,const struct usb_device_id * id)2862 static int hso_probe(struct usb_interface *interface,
2863 const struct usb_device_id *id)
2864 {
2865 int mux, i, if_num, port_spec;
2866 unsigned char port_mask;
2867 struct hso_device *hso_dev = NULL;
2868 struct hso_shared_int *shared_int;
2869 struct hso_device *tmp_dev = NULL;
2870
2871 if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
2872 dev_err(&interface->dev, "Not our interface\n");
2873 return -ENODEV;
2874 }
2875
2876 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2877
2878 /* Get the interface/port specification from either driver_info or from
2879 * the device itself */
2880 if (id->driver_info)
2881 port_spec = ((u32 *)(id->driver_info))[if_num];
2882 else
2883 port_spec = hso_get_config_data(interface);
2884
2885 /* Check if we need to switch to alt interfaces prior to port
2886 * configuration */
2887 if (interface->num_altsetting > 1)
2888 usb_set_interface(interface_to_usbdev(interface), if_num, 1);
2889 interface->needs_remote_wakeup = 1;
2890
2891 /* Allocate new hso device(s) */
2892 switch (port_spec & HSO_INTF_MASK) {
2893 case HSO_INTF_MUX:
2894 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2895 /* Create the network device */
2896 if (!disable_net) {
2897 hso_dev = hso_create_net_device(interface,
2898 port_spec);
2899 if (!hso_dev)
2900 goto exit;
2901 tmp_dev = hso_dev;
2902 }
2903 }
2904
2905 if (hso_get_mux_ports(interface, &port_mask))
2906 /* TODO: de-allocate everything */
2907 goto exit;
2908
2909 shared_int = hso_create_shared_int(interface);
2910 if (!shared_int)
2911 goto exit;
2912
2913 for (i = 1, mux = 0; i < 0x100; i = i << 1, mux++) {
2914 if (port_mask & i) {
2915 hso_dev = hso_create_mux_serial_device(
2916 interface, i, shared_int);
2917 if (!hso_dev)
2918 goto exit;
2919 }
2920 }
2921
2922 if (tmp_dev)
2923 hso_dev = tmp_dev;
2924 break;
2925
2926 case HSO_INTF_BULK:
2927 /* It's a regular bulk interface */
2928 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2929 if (!disable_net)
2930 hso_dev =
2931 hso_create_net_device(interface, port_spec);
2932 } else {
2933 hso_dev =
2934 hso_create_bulk_serial_device(interface, port_spec);
2935 }
2936 if (!hso_dev)
2937 goto exit;
2938 break;
2939 default:
2940 goto exit;
2941 }
2942
2943 /* save our data pointer in this device */
2944 usb_set_intfdata(interface, hso_dev);
2945
2946 /* done */
2947 return 0;
2948 exit:
2949 hso_free_interface(interface);
2950 return -ENODEV;
2951 }
2952
2953 /* device removed, cleaning up */
hso_disconnect(struct usb_interface * interface)2954 static void hso_disconnect(struct usb_interface *interface)
2955 {
2956 hso_free_interface(interface);
2957
2958 /* remove reference of our private data */
2959 usb_set_intfdata(interface, NULL);
2960 }
2961
async_get_intf(struct work_struct * data)2962 static void async_get_intf(struct work_struct *data)
2963 {
2964 struct hso_device *hso_dev =
2965 container_of(data, struct hso_device, async_get_intf);
2966 usb_autopm_get_interface(hso_dev->interface);
2967 }
2968
async_put_intf(struct work_struct * data)2969 static void async_put_intf(struct work_struct *data)
2970 {
2971 struct hso_device *hso_dev =
2972 container_of(data, struct hso_device, async_put_intf);
2973 usb_autopm_put_interface(hso_dev->interface);
2974 }
2975
hso_get_activity(struct hso_device * hso_dev)2976 static int hso_get_activity(struct hso_device *hso_dev)
2977 {
2978 if (hso_dev->usb->state == USB_STATE_SUSPENDED) {
2979 if (!hso_dev->is_active) {
2980 hso_dev->is_active = 1;
2981 schedule_work(&hso_dev->async_get_intf);
2982 }
2983 }
2984
2985 if (hso_dev->usb->state != USB_STATE_CONFIGURED)
2986 return -EAGAIN;
2987
2988 usb_mark_last_busy(hso_dev->usb);
2989
2990 return 0;
2991 }
2992
hso_put_activity(struct hso_device * hso_dev)2993 static int hso_put_activity(struct hso_device *hso_dev)
2994 {
2995 if (hso_dev->usb->state != USB_STATE_SUSPENDED) {
2996 if (hso_dev->is_active) {
2997 hso_dev->is_active = 0;
2998 schedule_work(&hso_dev->async_put_intf);
2999 return -EAGAIN;
3000 }
3001 }
3002 hso_dev->is_active = 0;
3003 return 0;
3004 }
3005
3006 /* called by kernel when we need to suspend device */
hso_suspend(struct usb_interface * iface,pm_message_t message)3007 static int hso_suspend(struct usb_interface *iface, pm_message_t message)
3008 {
3009 int i, result;
3010
3011 /* Stop all serial ports */
3012 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3013 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3014 result = hso_stop_serial_device(serial_table[i]);
3015 if (result)
3016 goto out;
3017 }
3018 }
3019
3020 /* Stop all network ports */
3021 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3022 if (network_table[i] &&
3023 (network_table[i]->interface == iface)) {
3024 result = hso_stop_net_device(network_table[i]);
3025 if (result)
3026 goto out;
3027 }
3028 }
3029
3030 out:
3031 return 0;
3032 }
3033
3034 /* called by kernel when we need to resume device */
hso_resume(struct usb_interface * iface)3035 static int hso_resume(struct usb_interface *iface)
3036 {
3037 int i, result = 0;
3038 struct hso_net *hso_net;
3039
3040 /* Start all serial ports */
3041 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3042 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3043 if (dev2ser(serial_table[i])->port.count) {
3044 result =
3045 hso_start_serial_device(serial_table[i], GFP_NOIO);
3046 hso_kick_transmit(dev2ser(serial_table[i]));
3047 if (result)
3048 goto out;
3049 }
3050 }
3051 }
3052
3053 /* Start all network ports */
3054 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3055 if (network_table[i] &&
3056 (network_table[i]->interface == iface)) {
3057 hso_net = dev2net(network_table[i]);
3058 if (hso_net->flags & IFF_UP) {
3059 /* First transmit any lingering data,
3060 then restart the device. */
3061 if (hso_net->skb_tx_buf) {
3062 dev_dbg(&iface->dev,
3063 "Transmitting"
3064 " lingering data\n");
3065 hso_net_start_xmit(hso_net->skb_tx_buf,
3066 hso_net->net);
3067 hso_net->skb_tx_buf = NULL;
3068 }
3069 result = hso_start_net_device(network_table[i]);
3070 if (result)
3071 goto out;
3072 }
3073 }
3074 }
3075
3076 out:
3077 return result;
3078 }
3079
hso_serial_ref_free(struct kref * ref)3080 static void hso_serial_ref_free(struct kref *ref)
3081 {
3082 struct hso_device *hso_dev = container_of(ref, struct hso_device, ref);
3083
3084 hso_free_serial_device(hso_dev);
3085 }
3086
hso_free_interface(struct usb_interface * interface)3087 static void hso_free_interface(struct usb_interface *interface)
3088 {
3089 struct hso_serial *serial;
3090 int i;
3091
3092 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3093 if (serial_table[i] &&
3094 (serial_table[i]->interface == interface)) {
3095 serial = dev2ser(serial_table[i]);
3096 tty_port_tty_hangup(&serial->port, false);
3097 mutex_lock(&serial->parent->mutex);
3098 serial->parent->usb_gone = 1;
3099 mutex_unlock(&serial->parent->mutex);
3100 cancel_work_sync(&serial_table[i]->async_put_intf);
3101 cancel_work_sync(&serial_table[i]->async_get_intf);
3102 hso_serial_tty_unregister(serial);
3103 kref_put(&serial_table[i]->ref, hso_serial_ref_free);
3104 set_serial_by_index(i, NULL);
3105 }
3106 }
3107
3108 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3109 if (network_table[i] &&
3110 (network_table[i]->interface == interface)) {
3111 struct rfkill *rfk = dev2net(network_table[i])->rfkill;
3112 /* hso_stop_net_device doesn't stop the net queue since
3113 * traffic needs to start it again when suspended */
3114 netif_stop_queue(dev2net(network_table[i])->net);
3115 hso_stop_net_device(network_table[i]);
3116 cancel_work_sync(&network_table[i]->async_put_intf);
3117 cancel_work_sync(&network_table[i]->async_get_intf);
3118 if (rfk) {
3119 rfkill_unregister(rfk);
3120 rfkill_destroy(rfk);
3121 }
3122 hso_free_net_device(network_table[i]);
3123 }
3124 }
3125 }
3126
3127 /* Helper functions */
3128
3129 /* Get the endpoint ! */
hso_get_ep(struct usb_interface * intf,int type,int dir)3130 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
3131 int type, int dir)
3132 {
3133 int i;
3134 struct usb_host_interface *iface = intf->cur_altsetting;
3135 struct usb_endpoint_descriptor *endp;
3136
3137 for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3138 endp = &iface->endpoint[i].desc;
3139 if (((endp->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == dir) &&
3140 (usb_endpoint_type(endp) == type))
3141 return endp;
3142 }
3143
3144 return NULL;
3145 }
3146
3147 /* Get the byte that describes which ports are enabled */
hso_get_mux_ports(struct usb_interface * intf,unsigned char * ports)3148 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports)
3149 {
3150 int i;
3151 struct usb_host_interface *iface = intf->cur_altsetting;
3152
3153 if (iface->extralen == 3) {
3154 *ports = iface->extra[2];
3155 return 0;
3156 }
3157
3158 for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3159 if (iface->endpoint[i].extralen == 3) {
3160 *ports = iface->endpoint[i].extra[2];
3161 return 0;
3162 }
3163 }
3164
3165 return -1;
3166 }
3167
3168 /* 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)3169 static int hso_mux_submit_intr_urb(struct hso_shared_int *shared_int,
3170 struct usb_device *usb, gfp_t gfp)
3171 {
3172 int result;
3173
3174 usb_fill_int_urb(shared_int->shared_intr_urb, usb,
3175 usb_rcvintpipe(usb,
3176 shared_int->intr_endp->bEndpointAddress & 0x7F),
3177 shared_int->shared_intr_buf,
3178 1,
3179 intr_callback, shared_int,
3180 shared_int->intr_endp->bInterval);
3181
3182 result = usb_submit_urb(shared_int->shared_intr_urb, gfp);
3183 if (result)
3184 dev_warn(&usb->dev, "%s failed mux_intr_urb %d\n", __func__,
3185 result);
3186
3187 return result;
3188 }
3189
3190 /* operations setup of the serial interface */
3191 static const struct tty_operations hso_serial_ops = {
3192 .open = hso_serial_open,
3193 .close = hso_serial_close,
3194 .write = hso_serial_write,
3195 .write_room = hso_serial_write_room,
3196 .cleanup = hso_serial_cleanup,
3197 .ioctl = hso_serial_ioctl,
3198 .set_termios = hso_serial_set_termios,
3199 .chars_in_buffer = hso_serial_chars_in_buffer,
3200 .tiocmget = hso_serial_tiocmget,
3201 .tiocmset = hso_serial_tiocmset,
3202 .get_icount = hso_get_count,
3203 .unthrottle = hso_unthrottle
3204 };
3205
3206 static struct usb_driver hso_driver = {
3207 .name = driver_name,
3208 .probe = hso_probe,
3209 .disconnect = hso_disconnect,
3210 .id_table = hso_ids,
3211 .suspend = hso_suspend,
3212 .resume = hso_resume,
3213 .reset_resume = hso_resume,
3214 .supports_autosuspend = 1,
3215 .disable_hub_initiated_lpm = 1,
3216 };
3217
hso_init(void)3218 static int __init hso_init(void)
3219 {
3220 int i;
3221 int result;
3222
3223 /* put it in the log */
3224 pr_info("%s\n", version);
3225
3226 /* Initialise the serial table semaphore and table */
3227 spin_lock_init(&serial_table_lock);
3228 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++)
3229 serial_table[i] = NULL;
3230
3231 /* allocate our driver using the proper amount of supported minors */
3232 tty_drv = alloc_tty_driver(HSO_SERIAL_TTY_MINORS);
3233 if (!tty_drv)
3234 return -ENOMEM;
3235
3236 /* fill in all needed values */
3237 tty_drv->driver_name = driver_name;
3238 tty_drv->name = tty_filename;
3239
3240 /* if major number is provided as parameter, use that one */
3241 if (tty_major)
3242 tty_drv->major = tty_major;
3243
3244 tty_drv->minor_start = 0;
3245 tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
3246 tty_drv->subtype = SERIAL_TYPE_NORMAL;
3247 tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3248 tty_drv->init_termios = tty_std_termios;
3249 hso_init_termios(&tty_drv->init_termios);
3250 tty_set_operations(tty_drv, &hso_serial_ops);
3251
3252 /* register the tty driver */
3253 result = tty_register_driver(tty_drv);
3254 if (result) {
3255 pr_err("%s - tty_register_driver failed(%d)\n",
3256 __func__, result);
3257 goto err_free_tty;
3258 }
3259
3260 /* register this module as an usb driver */
3261 result = usb_register(&hso_driver);
3262 if (result) {
3263 pr_err("Could not register hso driver - error: %d\n", result);
3264 goto err_unreg_tty;
3265 }
3266
3267 /* done */
3268 return 0;
3269 err_unreg_tty:
3270 tty_unregister_driver(tty_drv);
3271 err_free_tty:
3272 put_tty_driver(tty_drv);
3273 return result;
3274 }
3275
hso_exit(void)3276 static void __exit hso_exit(void)
3277 {
3278 pr_info("unloaded\n");
3279
3280 tty_unregister_driver(tty_drv);
3281 /* deregister the usb driver */
3282 usb_deregister(&hso_driver);
3283 put_tty_driver(tty_drv);
3284 }
3285
3286 /* Module definitions */
3287 module_init(hso_init);
3288 module_exit(hso_exit);
3289
3290 MODULE_AUTHOR(MOD_AUTHOR);
3291 MODULE_DESCRIPTION(MOD_DESCRIPTION);
3292 MODULE_LICENSE("GPL");
3293
3294 /* change the debug level (eg: insmod hso.ko debug=0x04) */
3295 MODULE_PARM_DESC(debug, "debug level mask [0x01 | 0x02 | 0x04 | 0x08 | 0x10]");
3296 module_param(debug, int, 0644);
3297
3298 /* set the major tty number (eg: insmod hso.ko tty_major=245) */
3299 MODULE_PARM_DESC(tty_major, "Set the major tty number");
3300 module_param(tty_major, int, 0644);
3301
3302 /* disable network interface (eg: insmod hso.ko disable_net=1) */
3303 MODULE_PARM_DESC(disable_net, "Disable the network interface");
3304 module_param(disable_net, int, 0644);
3305
