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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * USB Serial Converter Generic functions | |
3 | * | |
d83b4053 | 4 | * Copyright (C) 2010 - 2011 Johan Hovold (jhovold@gmail.com) |
1da177e4 LT |
5 | * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com) |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License version | |
9 | * 2 as published by the Free Software Foundation. | |
10 | * | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/kernel.h> |
14 | #include <linux/errno.h> | |
15 | #include <linux/slab.h> | |
7f0ae3a8 | 16 | #include <linux/sysrq.h> |
1da177e4 LT |
17 | #include <linux/tty.h> |
18 | #include <linux/tty_flip.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/moduleparam.h> | |
21 | #include <linux/usb.h> | |
a969888c | 22 | #include <linux/usb/serial.h> |
ae64387a | 23 | #include <linux/uaccess.h> |
8e8dce06 | 24 | #include <linux/kfifo.h> |
1f87158e | 25 | #include <linux/serial.h> |
d9b1b787 | 26 | |
1da177e4 LT |
27 | static int debug; |
28 | ||
29 | #ifdef CONFIG_USB_SERIAL_GENERIC | |
b46d60fc | 30 | |
1da177e4 LT |
31 | static __u16 vendor = 0x05f9; |
32 | static __u16 product = 0xffff; | |
33 | ||
34 | module_param(vendor, ushort, 0); | |
35 | MODULE_PARM_DESC(vendor, "User specified USB idVendor"); | |
36 | ||
37 | module_param(product, ushort, 0); | |
38 | MODULE_PARM_DESC(product, "User specified USB idProduct"); | |
39 | ||
40 | static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */ | |
41 | ||
42 | /* All of the device info needed for the Generic Serial Converter */ | |
ea65370d | 43 | struct usb_serial_driver usb_serial_generic_device = { |
18fcac35 GKH |
44 | .driver = { |
45 | .owner = THIS_MODULE, | |
269bda1c | 46 | .name = "generic", |
18fcac35 | 47 | }, |
1da177e4 | 48 | .id_table = generic_device_ids, |
1da177e4 | 49 | .num_ports = 1, |
f9c99bb8 AS |
50 | .disconnect = usb_serial_generic_disconnect, |
51 | .release = usb_serial_generic_release, | |
253ca923 JR |
52 | .throttle = usb_serial_generic_throttle, |
53 | .unthrottle = usb_serial_generic_unthrottle, | |
ec22559e | 54 | .resume = usb_serial_generic_resume, |
1da177e4 LT |
55 | }; |
56 | ||
765e0ba6 AS |
57 | static struct usb_serial_driver * const serial_drivers[] = { |
58 | &usb_serial_generic_device, NULL | |
59 | }; | |
60 | ||
1da177e4 LT |
61 | #endif |
62 | ||
ae64387a | 63 | int usb_serial_generic_register(int _debug) |
1da177e4 LT |
64 | { |
65 | int retval = 0; | |
66 | ||
67 | debug = _debug; | |
68 | #ifdef CONFIG_USB_SERIAL_GENERIC | |
69 | generic_device_ids[0].idVendor = vendor; | |
70 | generic_device_ids[0].idProduct = product; | |
ae64387a AC |
71 | generic_device_ids[0].match_flags = |
72 | USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT; | |
1da177e4 LT |
73 | |
74 | /* register our generic driver with ourselves */ | |
0b84704a AS |
75 | retval = usb_serial_register_drivers(serial_drivers, |
76 | "usbserial_generic", generic_device_ids); | |
1da177e4 LT |
77 | #endif |
78 | return retval; | |
79 | } | |
80 | ||
ae64387a | 81 | void usb_serial_generic_deregister(void) |
1da177e4 LT |
82 | { |
83 | #ifdef CONFIG_USB_SERIAL_GENERIC | |
84 | /* remove our generic driver */ | |
68e24113 | 85 | usb_serial_deregister_drivers(serial_drivers); |
1da177e4 LT |
86 | #endif |
87 | } | |
88 | ||
a509a7e4 | 89 | int usb_serial_generic_open(struct tty_struct *tty, struct usb_serial_port *port) |
1da177e4 | 90 | { |
1da177e4 | 91 | int result = 0; |
253ca923 | 92 | unsigned long flags; |
1da177e4 | 93 | |
253ca923 JR |
94 | /* clear the throttle flags */ |
95 | spin_lock_irqsave(&port->lock, flags); | |
96 | port->throttled = 0; | |
97 | port->throttle_req = 0; | |
98 | spin_unlock_irqrestore(&port->lock, flags); | |
99 | ||
100 | /* if we have a bulk endpoint, start reading from it */ | |
41bd72f9 | 101 | if (port->bulk_in_size) |
d83b4053 | 102 | result = usb_serial_generic_submit_read_urbs(port, GFP_KERNEL); |
1da177e4 LT |
103 | |
104 | return result; | |
105 | } | |
815ddc99 | 106 | EXPORT_SYMBOL_GPL(usb_serial_generic_open); |
1da177e4 | 107 | |
95da310e | 108 | static void generic_cleanup(struct usb_serial_port *port) |
1da177e4 LT |
109 | { |
110 | struct usb_serial *serial = port->serial; | |
ec3ee508 | 111 | unsigned long flags; |
27c7acf2 | 112 | int i; |
1da177e4 | 113 | |
1da177e4 | 114 | if (serial->dev) { |
eb8878a8 | 115 | /* shutdown any bulk transfers that might be going on */ |
ec3ee508 | 116 | if (port->bulk_out_size) { |
27c7acf2 JH |
117 | for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) |
118 | usb_kill_urb(port->write_urbs[i]); | |
ec3ee508 JH |
119 | |
120 | spin_lock_irqsave(&port->lock, flags); | |
121 | kfifo_reset_out(&port->write_fifo); | |
122 | spin_unlock_irqrestore(&port->lock, flags); | |
123 | } | |
d83b4053 JH |
124 | if (port->bulk_in_size) { |
125 | for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) | |
126 | usb_kill_urb(port->read_urbs[i]); | |
127 | } | |
1da177e4 LT |
128 | } |
129 | } | |
130 | ||
335f8514 | 131 | void usb_serial_generic_close(struct usb_serial_port *port) |
1da177e4 | 132 | { |
ae64387a | 133 | generic_cleanup(port); |
1da177e4 | 134 | } |
f26788da | 135 | EXPORT_SYMBOL_GPL(usb_serial_generic_close); |
1da177e4 | 136 | |
eaa3bcb0 | 137 | int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port, |
c23e5fc1 | 138 | void *dest, size_t size) |
eaa3bcb0 | 139 | { |
c23e5fc1 | 140 | return kfifo_out_locked(&port->write_fifo, dest, size, &port->lock); |
715b1dc0 JW |
141 | } |
142 | ||
8e8dce06 DV |
143 | /** |
144 | * usb_serial_generic_write_start - kick off an URB write | |
145 | * @port: Pointer to the &struct usb_serial_port data | |
146 | * | |
27c7acf2 | 147 | * Returns zero on success, or a negative errno value |
8e8dce06 DV |
148 | */ |
149 | static int usb_serial_generic_write_start(struct usb_serial_port *port) | |
150 | { | |
27c7acf2 JH |
151 | struct urb *urb; |
152 | int count, result; | |
8e8dce06 | 153 | unsigned long flags; |
27c7acf2 | 154 | int i; |
8e8dce06 | 155 | |
27c7acf2 JH |
156 | if (test_and_set_bit_lock(USB_SERIAL_WRITE_BUSY, &port->flags)) |
157 | return 0; | |
158 | retry: | |
8e8dce06 | 159 | spin_lock_irqsave(&port->lock, flags); |
27c7acf2 JH |
160 | if (!port->write_urbs_free || !kfifo_len(&port->write_fifo)) { |
161 | clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags); | |
50a5f70c JH |
162 | spin_unlock_irqrestore(&port->lock, flags); |
163 | return 0; | |
8e8dce06 | 164 | } |
27c7acf2 JH |
165 | i = (int)find_first_bit(&port->write_urbs_free, |
166 | ARRAY_SIZE(port->write_urbs)); | |
8e8dce06 DV |
167 | spin_unlock_irqrestore(&port->lock, flags); |
168 | ||
27c7acf2 | 169 | urb = port->write_urbs[i]; |
eaa3bcb0 | 170 | count = port->serial->type->prepare_write_buffer(port, |
c23e5fc1 JH |
171 | urb->transfer_buffer, |
172 | port->bulk_out_size); | |
27c7acf2 JH |
173 | urb->transfer_buffer_length = count; |
174 | usb_serial_debug_data(debug, &port->dev, __func__, count, | |
175 | urb->transfer_buffer); | |
b58af406 JH |
176 | spin_lock_irqsave(&port->lock, flags); |
177 | port->tx_bytes += count; | |
178 | spin_unlock_irqrestore(&port->lock, flags); | |
179 | ||
180 | clear_bit(i, &port->write_urbs_free); | |
27c7acf2 | 181 | result = usb_submit_urb(urb, GFP_ATOMIC); |
8e8dce06 | 182 | if (result) { |
f1475a00 | 183 | dev_err_console(port, "%s - error submitting urb: %d\n", |
8e8dce06 | 184 | __func__, result); |
b58af406 JH |
185 | set_bit(i, &port->write_urbs_free); |
186 | spin_lock_irqsave(&port->lock, flags); | |
187 | port->tx_bytes -= count; | |
188 | spin_unlock_irqrestore(&port->lock, flags); | |
189 | ||
27c7acf2 | 190 | clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags); |
30af7fb5 JH |
191 | return result; |
192 | } | |
30af7fb5 | 193 | |
27c7acf2 JH |
194 | /* Try sending off another urb, unless in irq context (in which case |
195 | * there will be no free urb). */ | |
196 | if (!in_irq()) | |
197 | goto retry; | |
198 | ||
199 | clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags); | |
200 | ||
201 | return 0; | |
8e8dce06 DV |
202 | } |
203 | ||
204 | /** | |
205 | * usb_serial_generic_write - generic write function for serial USB devices | |
206 | * @tty: Pointer to &struct tty_struct for the device | |
207 | * @port: Pointer to the &usb_serial_port structure for the device | |
208 | * @buf: Pointer to the data to write | |
209 | * @count: Number of bytes to write | |
210 | * | |
211 | * Returns the number of characters actually written, which may be anything | |
212 | * from zero to @count. If an error occurs, it returns the negative errno | |
213 | * value. | |
214 | */ | |
95da310e AC |
215 | int usb_serial_generic_write(struct tty_struct *tty, |
216 | struct usb_serial_port *port, const unsigned char *buf, int count) | |
1da177e4 | 217 | { |
1da177e4 | 218 | int result; |
1da177e4 | 219 | |
eb8878a8 JH |
220 | /* only do something if we have a bulk out endpoint */ |
221 | if (!port->bulk_out_size) | |
222 | return -ENODEV; | |
223 | ||
1a1405e2 | 224 | if (!count) |
ae64387a | 225 | return 0; |
1da177e4 | 226 | |
119eecc8 | 227 | count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); |
8e8dce06 | 228 | result = usb_serial_generic_write_start(port); |
c23e5fc1 JH |
229 | if (result) |
230 | return result; | |
1da177e4 | 231 | |
c23e5fc1 | 232 | return count; |
1da177e4 | 233 | } |
98fcb5f7 | 234 | EXPORT_SYMBOL_GPL(usb_serial_generic_write); |
1da177e4 | 235 | |
ae64387a | 236 | int usb_serial_generic_write_room(struct tty_struct *tty) |
1da177e4 | 237 | { |
95da310e | 238 | struct usb_serial_port *port = tty->driver_data; |
715b1dc0 | 239 | unsigned long flags; |
25d514ca | 240 | int room; |
1da177e4 | 241 | |
eb8878a8 JH |
242 | if (!port->bulk_out_size) |
243 | return 0; | |
244 | ||
715b1dc0 | 245 | spin_lock_irqsave(&port->lock, flags); |
c23e5fc1 | 246 | room = kfifo_avail(&port->write_fifo); |
715b1dc0 | 247 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 248 | |
689c2781 | 249 | dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); |
a5b6f60c | 250 | return room; |
1da177e4 LT |
251 | } |
252 | ||
95da310e | 253 | int usb_serial_generic_chars_in_buffer(struct tty_struct *tty) |
1da177e4 | 254 | { |
95da310e | 255 | struct usb_serial_port *port = tty->driver_data; |
715b1dc0 | 256 | unsigned long flags; |
eb8878a8 | 257 | int chars; |
1da177e4 | 258 | |
eb8878a8 JH |
259 | if (!port->bulk_out_size) |
260 | return 0; | |
261 | ||
25719e6b | 262 | spin_lock_irqsave(&port->lock, flags); |
c23e5fc1 | 263 | chars = kfifo_len(&port->write_fifo) + port->tx_bytes; |
25719e6b | 264 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 265 | |
689c2781 | 266 | dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); |
95da310e | 267 | return chars; |
1da177e4 LT |
268 | } |
269 | ||
d83b4053 JH |
270 | static int usb_serial_generic_submit_read_urb(struct usb_serial_port *port, |
271 | int index, gfp_t mem_flags) | |
272 | { | |
273 | int res; | |
274 | ||
275 | if (!test_and_clear_bit(index, &port->read_urbs_free)) | |
276 | return 0; | |
277 | ||
689c2781 GKH |
278 | dev_dbg(&port->dev, "%s - port %d, urb %d\n", __func__, |
279 | port->number, index); | |
d83b4053 JH |
280 | |
281 | res = usb_submit_urb(port->read_urbs[index], mem_flags); | |
282 | if (res) { | |
283 | if (res != -EPERM) { | |
284 | dev_err(&port->dev, | |
285 | "%s - usb_submit_urb failed: %d\n", | |
286 | __func__, res); | |
287 | } | |
288 | set_bit(index, &port->read_urbs_free); | |
289 | return res; | |
290 | } | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
295 | int usb_serial_generic_submit_read_urbs(struct usb_serial_port *port, | |
41bd72f9 | 296 | gfp_t mem_flags) |
1da177e4 | 297 | { |
d83b4053 JH |
298 | int res; |
299 | int i; | |
1da177e4 | 300 | |
d83b4053 JH |
301 | for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) { |
302 | res = usb_serial_generic_submit_read_urb(port, i, mem_flags); | |
303 | if (res) | |
304 | goto err; | |
0ae14743 | 305 | } |
d83b4053 JH |
306 | |
307 | return 0; | |
308 | err: | |
309 | for (; i >= 0; --i) | |
310 | usb_kill_urb(port->read_urbs[i]); | |
311 | ||
312 | return res; | |
1da177e4 | 313 | } |
d83b4053 | 314 | EXPORT_SYMBOL_GPL(usb_serial_generic_submit_read_urbs); |
253ca923 | 315 | |
23154320 | 316 | void usb_serial_generic_process_read_urb(struct urb *urb) |
1abdeeb1 | 317 | { |
0f3d5bae JH |
318 | struct usb_serial_port *port = urb->context; |
319 | struct tty_struct *tty; | |
98fcb5f7 JW |
320 | char *ch = (char *)urb->transfer_buffer; |
321 | int i; | |
322 | ||
56a1df46 JH |
323 | if (!urb->actual_length) |
324 | return; | |
325 | ||
0f3d5bae | 326 | tty = tty_port_tty_get(&port->port); |
98fcb5f7 | 327 | if (!tty) |
0f3d5bae | 328 | return; |
1abdeeb1 | 329 | |
4cd1de0a AC |
330 | /* The per character mucking around with sysrq path it too slow for |
331 | stuff like 3G modems, so shortcircuit it in the 99.9999999% of cases | |
332 | where the USB serial is not a console anyway */ | |
bd5afa9e | 333 | if (!port->port.console || !port->sysrq) |
4cd1de0a AC |
334 | tty_insert_flip_string(tty, ch, urb->actual_length); |
335 | else { | |
4cd1de0a | 336 | for (i = 0; i < urb->actual_length; i++, ch++) { |
6ee9f4b4 | 337 | if (!usb_serial_handle_sysrq_char(port, *ch)) |
4cd1de0a AC |
338 | tty_insert_flip_char(tty, *ch, TTY_NORMAL); |
339 | } | |
1abdeeb1 | 340 | } |
98fcb5f7 | 341 | tty_flip_buffer_push(tty); |
4a90f09b | 342 | tty_kref_put(tty); |
1abdeeb1 | 343 | } |
23154320 | 344 | EXPORT_SYMBOL_GPL(usb_serial_generic_process_read_urb); |
1abdeeb1 | 345 | |
95da310e | 346 | void usb_serial_generic_read_bulk_callback(struct urb *urb) |
253ca923 | 347 | { |
cdc97792 | 348 | struct usb_serial_port *port = urb->context; |
253ca923 | 349 | unsigned char *data = urb->transfer_buffer; |
bfaeafcf | 350 | unsigned long flags; |
d83b4053 | 351 | int i; |
253ca923 | 352 | |
d83b4053 JH |
353 | for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) { |
354 | if (urb == port->read_urbs[i]) | |
355 | break; | |
356 | } | |
357 | set_bit(i, &port->read_urbs_free); | |
253ca923 | 358 | |
689c2781 GKH |
359 | dev_dbg(&port->dev, "%s - port %d, urb %d, len %d\n", |
360 | __func__, port->number, i, urb->actual_length); | |
361 | ||
d83b4053 | 362 | if (urb->status) { |
689c2781 GKH |
363 | dev_dbg(&port->dev, "%s - non-zero urb status: %d\n", |
364 | __func__, urb->status); | |
253ca923 JR |
365 | return; |
366 | } | |
367 | ||
ae64387a AC |
368 | usb_serial_debug_data(debug, &port->dev, __func__, |
369 | urb->actual_length, data); | |
23154320 | 370 | port->serial->type->process_read_urb(urb); |
253ca923 JR |
371 | |
372 | /* Throttle the device if requested by tty */ | |
bfaeafcf | 373 | spin_lock_irqsave(&port->lock, flags); |
ae64387a AC |
374 | port->throttled = port->throttle_req; |
375 | if (!port->throttled) { | |
b507cc97 | 376 | spin_unlock_irqrestore(&port->lock, flags); |
d83b4053 | 377 | usb_serial_generic_submit_read_urb(port, i, GFP_ATOMIC); |
ae64387a | 378 | } else |
b507cc97 | 379 | spin_unlock_irqrestore(&port->lock, flags); |
253ca923 | 380 | } |
166ffccf | 381 | EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback); |
1da177e4 | 382 | |
95da310e | 383 | void usb_serial_generic_write_bulk_callback(struct urb *urb) |
1da177e4 | 384 | { |
715b1dc0 | 385 | unsigned long flags; |
cdc97792 | 386 | struct usb_serial_port *port = urb->context; |
fbd27225 | 387 | int status = urb->status; |
27c7acf2 | 388 | int i; |
1da177e4 | 389 | |
c23e5fc1 JH |
390 | for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) |
391 | if (port->write_urbs[i] == urb) | |
392 | break; | |
25915302 | 393 | |
c23e5fc1 JH |
394 | spin_lock_irqsave(&port->lock, flags); |
395 | port->tx_bytes -= urb->transfer_buffer_length; | |
396 | set_bit(i, &port->write_urbs_free); | |
397 | spin_unlock_irqrestore(&port->lock, flags); | |
398 | ||
399 | if (status) { | |
689c2781 GKH |
400 | dev_dbg(&port->dev, "%s - non-zero urb status: %d\n", |
401 | __func__, status); | |
27c7acf2 | 402 | |
30af7fb5 | 403 | spin_lock_irqsave(&port->lock, flags); |
c23e5fc1 | 404 | kfifo_reset_out(&port->write_fifo); |
30af7fb5 | 405 | spin_unlock_irqrestore(&port->lock, flags); |
c23e5fc1 JH |
406 | } else { |
407 | usb_serial_generic_write_start(port); | |
1da177e4 | 408 | } |
8e8dce06 | 409 | |
cf2c7481 | 410 | usb_serial_port_softint(port); |
1da177e4 | 411 | } |
bb833986 | 412 | EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback); |
1da177e4 | 413 | |
95da310e | 414 | void usb_serial_generic_throttle(struct tty_struct *tty) |
253ca923 | 415 | { |
95da310e | 416 | struct usb_serial_port *port = tty->driver_data; |
253ca923 JR |
417 | unsigned long flags; |
418 | ||
253ca923 JR |
419 | /* Set the throttle request flag. It will be picked up |
420 | * by usb_serial_generic_read_bulk_callback(). */ | |
421 | spin_lock_irqsave(&port->lock, flags); | |
422 | port->throttle_req = 1; | |
423 | spin_unlock_irqrestore(&port->lock, flags); | |
424 | } | |
f1e949ac | 425 | EXPORT_SYMBOL_GPL(usb_serial_generic_throttle); |
253ca923 | 426 | |
95da310e | 427 | void usb_serial_generic_unthrottle(struct tty_struct *tty) |
253ca923 | 428 | { |
95da310e | 429 | struct usb_serial_port *port = tty->driver_data; |
253ca923 | 430 | int was_throttled; |
253ca923 | 431 | |
253ca923 | 432 | /* Clear the throttle flags */ |
0f3d5bae | 433 | spin_lock_irq(&port->lock); |
253ca923 JR |
434 | was_throttled = port->throttled; |
435 | port->throttled = port->throttle_req = 0; | |
0f3d5bae | 436 | spin_unlock_irq(&port->lock); |
253ca923 | 437 | |
0f3d5bae | 438 | if (was_throttled) |
d83b4053 | 439 | usb_serial_generic_submit_read_urbs(port, GFP_KERNEL); |
253ca923 | 440 | } |
f1e949ac | 441 | EXPORT_SYMBOL_GPL(usb_serial_generic_unthrottle); |
253ca923 | 442 | |
7f0ae3a8 | 443 | #ifdef CONFIG_MAGIC_SYSRQ |
6ee9f4b4 | 444 | int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch) |
98fcb5f7 | 445 | { |
bd5afa9e | 446 | if (port->sysrq && port->port.console) { |
98fcb5f7 | 447 | if (ch && time_before(jiffies, port->sysrq)) { |
f335397d | 448 | handle_sysrq(ch); |
98fcb5f7 JW |
449 | port->sysrq = 0; |
450 | return 1; | |
451 | } | |
452 | port->sysrq = 0; | |
453 | } | |
454 | return 0; | |
455 | } | |
7f0ae3a8 | 456 | #else |
6ee9f4b4 | 457 | int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch) |
7f0ae3a8 RD |
458 | { |
459 | return 0; | |
460 | } | |
461 | #endif | |
98fcb5f7 JW |
462 | EXPORT_SYMBOL_GPL(usb_serial_handle_sysrq_char); |
463 | ||
464 | int usb_serial_handle_break(struct usb_serial_port *port) | |
465 | { | |
466 | if (!port->sysrq) { | |
467 | port->sysrq = jiffies + HZ*5; | |
468 | return 1; | |
469 | } | |
470 | port->sysrq = 0; | |
471 | return 0; | |
472 | } | |
473 | EXPORT_SYMBOL_GPL(usb_serial_handle_break); | |
474 | ||
d14fc1a7 LP |
475 | /** |
476 | * usb_serial_handle_dcd_change - handle a change of carrier detect state | |
477 | * @port: usb_serial_port structure for the open port | |
478 | * @tty: tty_struct structure for the port | |
479 | * @status: new carrier detect status, nonzero if active | |
480 | */ | |
481 | void usb_serial_handle_dcd_change(struct usb_serial_port *usb_port, | |
482 | struct tty_struct *tty, unsigned int status) | |
483 | { | |
484 | struct tty_port *port = &usb_port->port; | |
485 | ||
689c2781 GKH |
486 | dev_dbg(&usb_port->dev, "%s - port %d, status %d\n", __func__, |
487 | usb_port->number, status); | |
d14fc1a7 LP |
488 | |
489 | if (status) | |
490 | wake_up_interruptible(&port->open_wait); | |
491 | else if (tty && !C_CLOCAL(tty)) | |
492 | tty_hangup(tty); | |
493 | } | |
494 | EXPORT_SYMBOL_GPL(usb_serial_handle_dcd_change); | |
495 | ||
8e8dce06 DV |
496 | int usb_serial_generic_resume(struct usb_serial *serial) |
497 | { | |
498 | struct usb_serial_port *port; | |
499 | int i, c = 0, r; | |
500 | ||
501 | for (i = 0; i < serial->num_ports; i++) { | |
502 | port = serial->port[i]; | |
1f87158e | 503 | if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags)) |
8e8dce06 DV |
504 | continue; |
505 | ||
d83b4053 JH |
506 | if (port->bulk_in_size) { |
507 | r = usb_serial_generic_submit_read_urbs(port, | |
508 | GFP_NOIO); | |
8e8dce06 DV |
509 | if (r < 0) |
510 | c++; | |
511 | } | |
512 | ||
27c7acf2 | 513 | if (port->bulk_out_size) { |
8e8dce06 DV |
514 | r = usb_serial_generic_write_start(port); |
515 | if (r < 0) | |
516 | c++; | |
517 | } | |
518 | } | |
519 | ||
520 | return c ? -EIO : 0; | |
521 | } | |
522 | EXPORT_SYMBOL_GPL(usb_serial_generic_resume); | |
523 | ||
f9c99bb8 | 524 | void usb_serial_generic_disconnect(struct usb_serial *serial) |
1da177e4 LT |
525 | { |
526 | int i; | |
527 | ||
1da177e4 | 528 | /* stop reads and writes on all ports */ |
ae64387a | 529 | for (i = 0; i < serial->num_ports; ++i) |
1da177e4 | 530 | generic_cleanup(serial->port[i]); |
1da177e4 | 531 | } |
5c7efeb7 | 532 | EXPORT_SYMBOL_GPL(usb_serial_generic_disconnect); |
1da177e4 | 533 | |
f9c99bb8 AS |
534 | void usb_serial_generic_release(struct usb_serial *serial) |
535 | { | |
f9c99bb8 | 536 | } |