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 | 27 | #ifdef CONFIG_USB_SERIAL_GENERIC |
b46d60fc | 28 | |
1da177e4 LT |
29 | static __u16 vendor = 0x05f9; |
30 | static __u16 product = 0xffff; | |
31 | ||
32 | module_param(vendor, ushort, 0); | |
33 | MODULE_PARM_DESC(vendor, "User specified USB idVendor"); | |
34 | ||
35 | module_param(product, ushort, 0); | |
36 | MODULE_PARM_DESC(product, "User specified USB idProduct"); | |
37 | ||
38 | static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */ | |
39 | ||
40 | /* All of the device info needed for the Generic Serial Converter */ | |
ea65370d | 41 | struct usb_serial_driver usb_serial_generic_device = { |
18fcac35 GKH |
42 | .driver = { |
43 | .owner = THIS_MODULE, | |
269bda1c | 44 | .name = "generic", |
18fcac35 | 45 | }, |
1da177e4 | 46 | .id_table = generic_device_ids, |
1da177e4 | 47 | .num_ports = 1, |
f9c99bb8 AS |
48 | .disconnect = usb_serial_generic_disconnect, |
49 | .release = usb_serial_generic_release, | |
253ca923 JR |
50 | .throttle = usb_serial_generic_throttle, |
51 | .unthrottle = usb_serial_generic_unthrottle, | |
ec22559e | 52 | .resume = usb_serial_generic_resume, |
1da177e4 LT |
53 | }; |
54 | ||
765e0ba6 AS |
55 | static struct usb_serial_driver * const serial_drivers[] = { |
56 | &usb_serial_generic_device, NULL | |
57 | }; | |
58 | ||
1da177e4 LT |
59 | #endif |
60 | ||
3033bc8d | 61 | int usb_serial_generic_register(void) |
1da177e4 LT |
62 | { |
63 | int retval = 0; | |
64 | ||
1da177e4 LT |
65 | #ifdef CONFIG_USB_SERIAL_GENERIC |
66 | generic_device_ids[0].idVendor = vendor; | |
67 | generic_device_ids[0].idProduct = product; | |
ae64387a AC |
68 | generic_device_ids[0].match_flags = |
69 | USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT; | |
1da177e4 LT |
70 | |
71 | /* register our generic driver with ourselves */ | |
0b84704a AS |
72 | retval = usb_serial_register_drivers(serial_drivers, |
73 | "usbserial_generic", generic_device_ids); | |
1da177e4 LT |
74 | #endif |
75 | return retval; | |
76 | } | |
77 | ||
ae64387a | 78 | void usb_serial_generic_deregister(void) |
1da177e4 LT |
79 | { |
80 | #ifdef CONFIG_USB_SERIAL_GENERIC | |
81 | /* remove our generic driver */ | |
68e24113 | 82 | usb_serial_deregister_drivers(serial_drivers); |
1da177e4 LT |
83 | #endif |
84 | } | |
85 | ||
a509a7e4 | 86 | int usb_serial_generic_open(struct tty_struct *tty, struct usb_serial_port *port) |
1da177e4 | 87 | { |
1da177e4 | 88 | int result = 0; |
253ca923 | 89 | unsigned long flags; |
1da177e4 | 90 | |
253ca923 JR |
91 | /* clear the throttle flags */ |
92 | spin_lock_irqsave(&port->lock, flags); | |
93 | port->throttled = 0; | |
94 | port->throttle_req = 0; | |
95 | spin_unlock_irqrestore(&port->lock, flags); | |
96 | ||
97 | /* if we have a bulk endpoint, start reading from it */ | |
41bd72f9 | 98 | if (port->bulk_in_size) |
d83b4053 | 99 | result = usb_serial_generic_submit_read_urbs(port, GFP_KERNEL); |
1da177e4 LT |
100 | |
101 | return result; | |
102 | } | |
815ddc99 | 103 | EXPORT_SYMBOL_GPL(usb_serial_generic_open); |
1da177e4 | 104 | |
95da310e | 105 | static void generic_cleanup(struct usb_serial_port *port) |
1da177e4 LT |
106 | { |
107 | struct usb_serial *serial = port->serial; | |
ec3ee508 | 108 | unsigned long flags; |
27c7acf2 | 109 | int i; |
1da177e4 | 110 | |
1da177e4 | 111 | if (serial->dev) { |
eb8878a8 | 112 | /* shutdown any bulk transfers that might be going on */ |
ec3ee508 | 113 | if (port->bulk_out_size) { |
27c7acf2 JH |
114 | for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) |
115 | usb_kill_urb(port->write_urbs[i]); | |
ec3ee508 JH |
116 | |
117 | spin_lock_irqsave(&port->lock, flags); | |
118 | kfifo_reset_out(&port->write_fifo); | |
119 | spin_unlock_irqrestore(&port->lock, flags); | |
120 | } | |
d83b4053 JH |
121 | if (port->bulk_in_size) { |
122 | for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) | |
123 | usb_kill_urb(port->read_urbs[i]); | |
124 | } | |
1da177e4 LT |
125 | } |
126 | } | |
127 | ||
335f8514 | 128 | void usb_serial_generic_close(struct usb_serial_port *port) |
1da177e4 | 129 | { |
ae64387a | 130 | generic_cleanup(port); |
1da177e4 | 131 | } |
f26788da | 132 | EXPORT_SYMBOL_GPL(usb_serial_generic_close); |
1da177e4 | 133 | |
eaa3bcb0 | 134 | int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port, |
c23e5fc1 | 135 | void *dest, size_t size) |
eaa3bcb0 | 136 | { |
c23e5fc1 | 137 | return kfifo_out_locked(&port->write_fifo, dest, size, &port->lock); |
715b1dc0 JW |
138 | } |
139 | ||
8e8dce06 DV |
140 | /** |
141 | * usb_serial_generic_write_start - kick off an URB write | |
142 | * @port: Pointer to the &struct usb_serial_port data | |
143 | * | |
27c7acf2 | 144 | * Returns zero on success, or a negative errno value |
8e8dce06 DV |
145 | */ |
146 | static int usb_serial_generic_write_start(struct usb_serial_port *port) | |
147 | { | |
27c7acf2 JH |
148 | struct urb *urb; |
149 | int count, result; | |
8e8dce06 | 150 | unsigned long flags; |
27c7acf2 | 151 | int i; |
8e8dce06 | 152 | |
27c7acf2 JH |
153 | if (test_and_set_bit_lock(USB_SERIAL_WRITE_BUSY, &port->flags)) |
154 | return 0; | |
155 | retry: | |
8e8dce06 | 156 | spin_lock_irqsave(&port->lock, flags); |
27c7acf2 JH |
157 | if (!port->write_urbs_free || !kfifo_len(&port->write_fifo)) { |
158 | clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags); | |
50a5f70c JH |
159 | spin_unlock_irqrestore(&port->lock, flags); |
160 | return 0; | |
8e8dce06 | 161 | } |
27c7acf2 JH |
162 | i = (int)find_first_bit(&port->write_urbs_free, |
163 | ARRAY_SIZE(port->write_urbs)); | |
8e8dce06 DV |
164 | spin_unlock_irqrestore(&port->lock, flags); |
165 | ||
27c7acf2 | 166 | urb = port->write_urbs[i]; |
eaa3bcb0 | 167 | count = port->serial->type->prepare_write_buffer(port, |
c23e5fc1 JH |
168 | urb->transfer_buffer, |
169 | port->bulk_out_size); | |
27c7acf2 | 170 | urb->transfer_buffer_length = count; |
59d33f2f | 171 | usb_serial_debug_data(&port->dev, __func__, count, urb->transfer_buffer); |
b58af406 JH |
172 | spin_lock_irqsave(&port->lock, flags); |
173 | port->tx_bytes += count; | |
174 | spin_unlock_irqrestore(&port->lock, flags); | |
175 | ||
176 | clear_bit(i, &port->write_urbs_free); | |
27c7acf2 | 177 | result = usb_submit_urb(urb, GFP_ATOMIC); |
8e8dce06 | 178 | if (result) { |
f1475a00 | 179 | dev_err_console(port, "%s - error submitting urb: %d\n", |
8e8dce06 | 180 | __func__, result); |
b58af406 JH |
181 | set_bit(i, &port->write_urbs_free); |
182 | spin_lock_irqsave(&port->lock, flags); | |
183 | port->tx_bytes -= count; | |
184 | spin_unlock_irqrestore(&port->lock, flags); | |
185 | ||
27c7acf2 | 186 | clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags); |
30af7fb5 JH |
187 | return result; |
188 | } | |
30af7fb5 | 189 | |
27c7acf2 JH |
190 | /* Try sending off another urb, unless in irq context (in which case |
191 | * there will be no free urb). */ | |
192 | if (!in_irq()) | |
193 | goto retry; | |
194 | ||
195 | clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags); | |
196 | ||
197 | return 0; | |
8e8dce06 DV |
198 | } |
199 | ||
200 | /** | |
201 | * usb_serial_generic_write - generic write function for serial USB devices | |
202 | * @tty: Pointer to &struct tty_struct for the device | |
203 | * @port: Pointer to the &usb_serial_port structure for the device | |
204 | * @buf: Pointer to the data to write | |
205 | * @count: Number of bytes to write | |
206 | * | |
207 | * Returns the number of characters actually written, which may be anything | |
208 | * from zero to @count. If an error occurs, it returns the negative errno | |
209 | * value. | |
210 | */ | |
95da310e AC |
211 | int usb_serial_generic_write(struct tty_struct *tty, |
212 | struct usb_serial_port *port, const unsigned char *buf, int count) | |
1da177e4 | 213 | { |
1da177e4 | 214 | int result; |
1da177e4 | 215 | |
eb8878a8 JH |
216 | /* only do something if we have a bulk out endpoint */ |
217 | if (!port->bulk_out_size) | |
218 | return -ENODEV; | |
219 | ||
1a1405e2 | 220 | if (!count) |
ae64387a | 221 | return 0; |
1da177e4 | 222 | |
119eecc8 | 223 | count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); |
8e8dce06 | 224 | result = usb_serial_generic_write_start(port); |
c23e5fc1 JH |
225 | if (result) |
226 | return result; | |
1da177e4 | 227 | |
c23e5fc1 | 228 | return count; |
1da177e4 | 229 | } |
98fcb5f7 | 230 | EXPORT_SYMBOL_GPL(usb_serial_generic_write); |
1da177e4 | 231 | |
ae64387a | 232 | int usb_serial_generic_write_room(struct tty_struct *tty) |
1da177e4 | 233 | { |
95da310e | 234 | struct usb_serial_port *port = tty->driver_data; |
715b1dc0 | 235 | unsigned long flags; |
25d514ca | 236 | int room; |
1da177e4 | 237 | |
eb8878a8 JH |
238 | if (!port->bulk_out_size) |
239 | return 0; | |
240 | ||
715b1dc0 | 241 | spin_lock_irqsave(&port->lock, flags); |
c23e5fc1 | 242 | room = kfifo_avail(&port->write_fifo); |
715b1dc0 | 243 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 244 | |
689c2781 | 245 | dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); |
a5b6f60c | 246 | return room; |
1da177e4 LT |
247 | } |
248 | ||
95da310e | 249 | int usb_serial_generic_chars_in_buffer(struct tty_struct *tty) |
1da177e4 | 250 | { |
95da310e | 251 | struct usb_serial_port *port = tty->driver_data; |
715b1dc0 | 252 | unsigned long flags; |
eb8878a8 | 253 | int chars; |
1da177e4 | 254 | |
eb8878a8 JH |
255 | if (!port->bulk_out_size) |
256 | return 0; | |
257 | ||
25719e6b | 258 | spin_lock_irqsave(&port->lock, flags); |
c23e5fc1 | 259 | chars = kfifo_len(&port->write_fifo) + port->tx_bytes; |
25719e6b | 260 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 261 | |
689c2781 | 262 | dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); |
95da310e | 263 | return chars; |
1da177e4 LT |
264 | } |
265 | ||
d83b4053 JH |
266 | static int usb_serial_generic_submit_read_urb(struct usb_serial_port *port, |
267 | int index, gfp_t mem_flags) | |
268 | { | |
269 | int res; | |
270 | ||
271 | if (!test_and_clear_bit(index, &port->read_urbs_free)) | |
272 | return 0; | |
273 | ||
689c2781 GKH |
274 | dev_dbg(&port->dev, "%s - port %d, urb %d\n", __func__, |
275 | port->number, index); | |
d83b4053 JH |
276 | |
277 | res = usb_submit_urb(port->read_urbs[index], mem_flags); | |
278 | if (res) { | |
279 | if (res != -EPERM) { | |
280 | dev_err(&port->dev, | |
281 | "%s - usb_submit_urb failed: %d\n", | |
282 | __func__, res); | |
283 | } | |
284 | set_bit(index, &port->read_urbs_free); | |
285 | return res; | |
286 | } | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | int usb_serial_generic_submit_read_urbs(struct usb_serial_port *port, | |
41bd72f9 | 292 | gfp_t mem_flags) |
1da177e4 | 293 | { |
d83b4053 JH |
294 | int res; |
295 | int i; | |
1da177e4 | 296 | |
d83b4053 JH |
297 | for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) { |
298 | res = usb_serial_generic_submit_read_urb(port, i, mem_flags); | |
299 | if (res) | |
300 | goto err; | |
0ae14743 | 301 | } |
d83b4053 JH |
302 | |
303 | return 0; | |
304 | err: | |
305 | for (; i >= 0; --i) | |
306 | usb_kill_urb(port->read_urbs[i]); | |
307 | ||
308 | return res; | |
1da177e4 | 309 | } |
d83b4053 | 310 | EXPORT_SYMBOL_GPL(usb_serial_generic_submit_read_urbs); |
253ca923 | 311 | |
23154320 | 312 | void usb_serial_generic_process_read_urb(struct urb *urb) |
1abdeeb1 | 313 | { |
0f3d5bae JH |
314 | struct usb_serial_port *port = urb->context; |
315 | struct tty_struct *tty; | |
98fcb5f7 JW |
316 | char *ch = (char *)urb->transfer_buffer; |
317 | int i; | |
318 | ||
56a1df46 JH |
319 | if (!urb->actual_length) |
320 | return; | |
321 | ||
0f3d5bae | 322 | tty = tty_port_tty_get(&port->port); |
98fcb5f7 | 323 | if (!tty) |
0f3d5bae | 324 | return; |
1abdeeb1 | 325 | |
4cd1de0a AC |
326 | /* The per character mucking around with sysrq path it too slow for |
327 | stuff like 3G modems, so shortcircuit it in the 99.9999999% of cases | |
328 | where the USB serial is not a console anyway */ | |
bd5afa9e | 329 | if (!port->port.console || !port->sysrq) |
4cd1de0a AC |
330 | tty_insert_flip_string(tty, ch, urb->actual_length); |
331 | else { | |
4cd1de0a | 332 | for (i = 0; i < urb->actual_length; i++, ch++) { |
6ee9f4b4 | 333 | if (!usb_serial_handle_sysrq_char(port, *ch)) |
4cd1de0a AC |
334 | tty_insert_flip_char(tty, *ch, TTY_NORMAL); |
335 | } | |
1abdeeb1 | 336 | } |
98fcb5f7 | 337 | tty_flip_buffer_push(tty); |
4a90f09b | 338 | tty_kref_put(tty); |
1abdeeb1 | 339 | } |
23154320 | 340 | EXPORT_SYMBOL_GPL(usb_serial_generic_process_read_urb); |
1abdeeb1 | 341 | |
95da310e | 342 | void usb_serial_generic_read_bulk_callback(struct urb *urb) |
253ca923 | 343 | { |
cdc97792 | 344 | struct usb_serial_port *port = urb->context; |
253ca923 | 345 | unsigned char *data = urb->transfer_buffer; |
bfaeafcf | 346 | unsigned long flags; |
d83b4053 | 347 | int i; |
253ca923 | 348 | |
d83b4053 JH |
349 | for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) { |
350 | if (urb == port->read_urbs[i]) | |
351 | break; | |
352 | } | |
353 | set_bit(i, &port->read_urbs_free); | |
253ca923 | 354 | |
689c2781 GKH |
355 | dev_dbg(&port->dev, "%s - port %d, urb %d, len %d\n", |
356 | __func__, port->number, i, urb->actual_length); | |
357 | ||
d83b4053 | 358 | if (urb->status) { |
689c2781 GKH |
359 | dev_dbg(&port->dev, "%s - non-zero urb status: %d\n", |
360 | __func__, urb->status); | |
253ca923 JR |
361 | return; |
362 | } | |
363 | ||
59d33f2f | 364 | usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); |
23154320 | 365 | port->serial->type->process_read_urb(urb); |
253ca923 JR |
366 | |
367 | /* Throttle the device if requested by tty */ | |
bfaeafcf | 368 | spin_lock_irqsave(&port->lock, flags); |
ae64387a AC |
369 | port->throttled = port->throttle_req; |
370 | if (!port->throttled) { | |
b507cc97 | 371 | spin_unlock_irqrestore(&port->lock, flags); |
d83b4053 | 372 | usb_serial_generic_submit_read_urb(port, i, GFP_ATOMIC); |
ae64387a | 373 | } else |
b507cc97 | 374 | spin_unlock_irqrestore(&port->lock, flags); |
253ca923 | 375 | } |
166ffccf | 376 | EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback); |
1da177e4 | 377 | |
95da310e | 378 | void usb_serial_generic_write_bulk_callback(struct urb *urb) |
1da177e4 | 379 | { |
715b1dc0 | 380 | unsigned long flags; |
cdc97792 | 381 | struct usb_serial_port *port = urb->context; |
fbd27225 | 382 | int status = urb->status; |
27c7acf2 | 383 | int i; |
1da177e4 | 384 | |
c23e5fc1 JH |
385 | for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) |
386 | if (port->write_urbs[i] == urb) | |
387 | break; | |
25915302 | 388 | |
c23e5fc1 JH |
389 | spin_lock_irqsave(&port->lock, flags); |
390 | port->tx_bytes -= urb->transfer_buffer_length; | |
391 | set_bit(i, &port->write_urbs_free); | |
392 | spin_unlock_irqrestore(&port->lock, flags); | |
393 | ||
394 | if (status) { | |
689c2781 GKH |
395 | dev_dbg(&port->dev, "%s - non-zero urb status: %d\n", |
396 | __func__, status); | |
27c7acf2 | 397 | |
30af7fb5 | 398 | spin_lock_irqsave(&port->lock, flags); |
c23e5fc1 | 399 | kfifo_reset_out(&port->write_fifo); |
30af7fb5 | 400 | spin_unlock_irqrestore(&port->lock, flags); |
c23e5fc1 JH |
401 | } else { |
402 | usb_serial_generic_write_start(port); | |
1da177e4 | 403 | } |
8e8dce06 | 404 | |
cf2c7481 | 405 | usb_serial_port_softint(port); |
1da177e4 | 406 | } |
bb833986 | 407 | EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback); |
1da177e4 | 408 | |
95da310e | 409 | void usb_serial_generic_throttle(struct tty_struct *tty) |
253ca923 | 410 | { |
95da310e | 411 | struct usb_serial_port *port = tty->driver_data; |
253ca923 JR |
412 | unsigned long flags; |
413 | ||
253ca923 JR |
414 | /* Set the throttle request flag. It will be picked up |
415 | * by usb_serial_generic_read_bulk_callback(). */ | |
416 | spin_lock_irqsave(&port->lock, flags); | |
417 | port->throttle_req = 1; | |
418 | spin_unlock_irqrestore(&port->lock, flags); | |
419 | } | |
f1e949ac | 420 | EXPORT_SYMBOL_GPL(usb_serial_generic_throttle); |
253ca923 | 421 | |
95da310e | 422 | void usb_serial_generic_unthrottle(struct tty_struct *tty) |
253ca923 | 423 | { |
95da310e | 424 | struct usb_serial_port *port = tty->driver_data; |
253ca923 | 425 | int was_throttled; |
253ca923 | 426 | |
253ca923 | 427 | /* Clear the throttle flags */ |
0f3d5bae | 428 | spin_lock_irq(&port->lock); |
253ca923 JR |
429 | was_throttled = port->throttled; |
430 | port->throttled = port->throttle_req = 0; | |
0f3d5bae | 431 | spin_unlock_irq(&port->lock); |
253ca923 | 432 | |
0f3d5bae | 433 | if (was_throttled) |
d83b4053 | 434 | usb_serial_generic_submit_read_urbs(port, GFP_KERNEL); |
253ca923 | 435 | } |
f1e949ac | 436 | EXPORT_SYMBOL_GPL(usb_serial_generic_unthrottle); |
253ca923 | 437 | |
7f0ae3a8 | 438 | #ifdef CONFIG_MAGIC_SYSRQ |
6ee9f4b4 | 439 | int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch) |
98fcb5f7 | 440 | { |
bd5afa9e | 441 | if (port->sysrq && port->port.console) { |
98fcb5f7 | 442 | if (ch && time_before(jiffies, port->sysrq)) { |
f335397d | 443 | handle_sysrq(ch); |
98fcb5f7 JW |
444 | port->sysrq = 0; |
445 | return 1; | |
446 | } | |
447 | port->sysrq = 0; | |
448 | } | |
449 | return 0; | |
450 | } | |
7f0ae3a8 | 451 | #else |
6ee9f4b4 | 452 | int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch) |
7f0ae3a8 RD |
453 | { |
454 | return 0; | |
455 | } | |
456 | #endif | |
98fcb5f7 JW |
457 | EXPORT_SYMBOL_GPL(usb_serial_handle_sysrq_char); |
458 | ||
459 | int usb_serial_handle_break(struct usb_serial_port *port) | |
460 | { | |
461 | if (!port->sysrq) { | |
462 | port->sysrq = jiffies + HZ*5; | |
463 | return 1; | |
464 | } | |
465 | port->sysrq = 0; | |
466 | return 0; | |
467 | } | |
468 | EXPORT_SYMBOL_GPL(usb_serial_handle_break); | |
469 | ||
d14fc1a7 LP |
470 | /** |
471 | * usb_serial_handle_dcd_change - handle a change of carrier detect state | |
472 | * @port: usb_serial_port structure for the open port | |
473 | * @tty: tty_struct structure for the port | |
474 | * @status: new carrier detect status, nonzero if active | |
475 | */ | |
476 | void usb_serial_handle_dcd_change(struct usb_serial_port *usb_port, | |
477 | struct tty_struct *tty, unsigned int status) | |
478 | { | |
479 | struct tty_port *port = &usb_port->port; | |
480 | ||
689c2781 GKH |
481 | dev_dbg(&usb_port->dev, "%s - port %d, status %d\n", __func__, |
482 | usb_port->number, status); | |
d14fc1a7 LP |
483 | |
484 | if (status) | |
485 | wake_up_interruptible(&port->open_wait); | |
486 | else if (tty && !C_CLOCAL(tty)) | |
487 | tty_hangup(tty); | |
488 | } | |
489 | EXPORT_SYMBOL_GPL(usb_serial_handle_dcd_change); | |
490 | ||
8e8dce06 DV |
491 | int usb_serial_generic_resume(struct usb_serial *serial) |
492 | { | |
493 | struct usb_serial_port *port; | |
494 | int i, c = 0, r; | |
495 | ||
496 | for (i = 0; i < serial->num_ports; i++) { | |
497 | port = serial->port[i]; | |
1f87158e | 498 | if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags)) |
8e8dce06 DV |
499 | continue; |
500 | ||
d83b4053 JH |
501 | if (port->bulk_in_size) { |
502 | r = usb_serial_generic_submit_read_urbs(port, | |
503 | GFP_NOIO); | |
8e8dce06 DV |
504 | if (r < 0) |
505 | c++; | |
506 | } | |
507 | ||
27c7acf2 | 508 | if (port->bulk_out_size) { |
8e8dce06 DV |
509 | r = usb_serial_generic_write_start(port); |
510 | if (r < 0) | |
511 | c++; | |
512 | } | |
513 | } | |
514 | ||
515 | return c ? -EIO : 0; | |
516 | } | |
517 | EXPORT_SYMBOL_GPL(usb_serial_generic_resume); | |
518 | ||
f9c99bb8 | 519 | void usb_serial_generic_disconnect(struct usb_serial *serial) |
1da177e4 LT |
520 | { |
521 | int i; | |
522 | ||
1da177e4 | 523 | /* stop reads and writes on all ports */ |
ae64387a | 524 | for (i = 0; i < serial->num_ports; ++i) |
1da177e4 | 525 | generic_cleanup(serial->port[i]); |
1da177e4 | 526 | } |
5c7efeb7 | 527 | EXPORT_SYMBOL_GPL(usb_serial_generic_disconnect); |
1da177e4 | 528 | |
f9c99bb8 AS |
529 | void usb_serial_generic_release(struct usb_serial *serial) |
530 | { | |
f9c99bb8 | 531 | } |