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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * USB Serial Converter Generic functions | |
3 | * | |
4 | * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License version | |
8 | * 2 as published by the Free Software Foundation. | |
9 | * | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/errno.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/tty.h> | |
16 | #include <linux/tty_flip.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/moduleparam.h> | |
19 | #include <linux/usb.h> | |
a969888c | 20 | #include <linux/usb/serial.h> |
ae64387a | 21 | #include <linux/uaccess.h> |
8e8dce06 | 22 | #include <linux/kfifo.h> |
d9b1b787 | 23 | |
1da177e4 LT |
24 | static int debug; |
25 | ||
26 | #ifdef CONFIG_USB_SERIAL_GENERIC | |
b46d60fc DB |
27 | |
28 | static int generic_probe(struct usb_interface *interface, | |
29 | const struct usb_device_id *id); | |
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 | ||
d9b1b787 JH |
42 | /* we want to look at all devices, as the vendor/product id can change |
43 | * depending on the command line argument */ | |
44 | static struct usb_device_id generic_serial_ids[] = { | |
45 | {.driver_info = 42}, | |
46 | {} | |
47 | }; | |
48 | ||
49 | static struct usb_driver generic_driver = { | |
50 | .name = "usbserial_generic", | |
51 | .probe = generic_probe, | |
52 | .disconnect = usb_serial_disconnect, | |
53 | .id_table = generic_serial_ids, | |
54 | .no_dynamic_id = 1, | |
55 | }; | |
56 | ||
1da177e4 | 57 | /* All of the device info needed for the Generic Serial Converter */ |
ea65370d | 58 | struct usb_serial_driver usb_serial_generic_device = { |
18fcac35 GKH |
59 | .driver = { |
60 | .owner = THIS_MODULE, | |
269bda1c | 61 | .name = "generic", |
18fcac35 | 62 | }, |
1da177e4 | 63 | .id_table = generic_device_ids, |
d9b1b787 | 64 | .usb_driver = &generic_driver, |
1da177e4 | 65 | .num_ports = 1, |
f9c99bb8 AS |
66 | .disconnect = usb_serial_generic_disconnect, |
67 | .release = usb_serial_generic_release, | |
253ca923 JR |
68 | .throttle = usb_serial_generic_throttle, |
69 | .unthrottle = usb_serial_generic_unthrottle, | |
ec22559e | 70 | .resume = usb_serial_generic_resume, |
1da177e4 LT |
71 | }; |
72 | ||
1da177e4 LT |
73 | static int generic_probe(struct usb_interface *interface, |
74 | const struct usb_device_id *id) | |
75 | { | |
76 | const struct usb_device_id *id_pattern; | |
77 | ||
78 | id_pattern = usb_match_id(interface, generic_device_ids); | |
79 | if (id_pattern != NULL) | |
80 | return usb_serial_probe(interface, id); | |
81 | return -ENODEV; | |
82 | } | |
1da177e4 LT |
83 | #endif |
84 | ||
ae64387a | 85 | int usb_serial_generic_register(int _debug) |
1da177e4 LT |
86 | { |
87 | int retval = 0; | |
88 | ||
89 | debug = _debug; | |
90 | #ifdef CONFIG_USB_SERIAL_GENERIC | |
91 | generic_device_ids[0].idVendor = vendor; | |
92 | generic_device_ids[0].idProduct = product; | |
ae64387a AC |
93 | generic_device_ids[0].match_flags = |
94 | USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT; | |
1da177e4 LT |
95 | |
96 | /* register our generic driver with ourselves */ | |
ae64387a | 97 | retval = usb_serial_register(&usb_serial_generic_device); |
1da177e4 LT |
98 | if (retval) |
99 | goto exit; | |
100 | retval = usb_register(&generic_driver); | |
101 | if (retval) | |
102 | usb_serial_deregister(&usb_serial_generic_device); | |
103 | exit: | |
104 | #endif | |
105 | return retval; | |
106 | } | |
107 | ||
ae64387a | 108 | void usb_serial_generic_deregister(void) |
1da177e4 LT |
109 | { |
110 | #ifdef CONFIG_USB_SERIAL_GENERIC | |
111 | /* remove our generic driver */ | |
112 | usb_deregister(&generic_driver); | |
ae64387a | 113 | usb_serial_deregister(&usb_serial_generic_device); |
1da177e4 LT |
114 | #endif |
115 | } | |
116 | ||
a509a7e4 | 117 | int usb_serial_generic_open(struct tty_struct *tty, struct usb_serial_port *port) |
1da177e4 LT |
118 | { |
119 | struct usb_serial *serial = port->serial; | |
120 | int result = 0; | |
253ca923 | 121 | unsigned long flags; |
1da177e4 | 122 | |
441b62c1 | 123 | dbg("%s - port %d", __func__, port->number); |
1da177e4 | 124 | |
253ca923 JR |
125 | /* clear the throttle flags */ |
126 | spin_lock_irqsave(&port->lock, flags); | |
127 | port->throttled = 0; | |
128 | port->throttle_req = 0; | |
129 | spin_unlock_irqrestore(&port->lock, flags); | |
130 | ||
131 | /* if we have a bulk endpoint, start reading from it */ | |
1da177e4 LT |
132 | if (serial->num_bulk_in) { |
133 | /* Start reading from the device */ | |
ae64387a AC |
134 | usb_fill_bulk_urb(port->read_urb, serial->dev, |
135 | usb_rcvbulkpipe(serial->dev, | |
136 | port->bulk_in_endpointAddress), | |
1da177e4 LT |
137 | port->read_urb->transfer_buffer, |
138 | port->read_urb->transfer_buffer_length, | |
139 | ((serial->type->read_bulk_callback) ? | |
140 | serial->type->read_bulk_callback : | |
141 | usb_serial_generic_read_bulk_callback), | |
142 | port); | |
143 | result = usb_submit_urb(port->read_urb, GFP_KERNEL); | |
144 | if (result) | |
ae64387a AC |
145 | dev_err(&port->dev, |
146 | "%s - failed resubmitting read urb, error %d\n", | |
147 | __func__, result); | |
1da177e4 LT |
148 | } |
149 | ||
150 | return result; | |
151 | } | |
815ddc99 | 152 | EXPORT_SYMBOL_GPL(usb_serial_generic_open); |
1da177e4 | 153 | |
95da310e | 154 | static void generic_cleanup(struct usb_serial_port *port) |
1da177e4 LT |
155 | { |
156 | struct usb_serial *serial = port->serial; | |
157 | ||
441b62c1 | 158 | dbg("%s - port %d", __func__, port->number); |
1da177e4 LT |
159 | |
160 | if (serial->dev) { | |
161 | /* shutdown any bulk reads that might be going on */ | |
162 | if (serial->num_bulk_out) | |
163 | usb_kill_urb(port->write_urb); | |
164 | if (serial->num_bulk_in) | |
165 | usb_kill_urb(port->read_urb); | |
166 | } | |
167 | } | |
168 | ||
335f8514 | 169 | void usb_serial_generic_close(struct usb_serial_port *port) |
1da177e4 | 170 | { |
441b62c1 | 171 | dbg("%s - port %d", __func__, port->number); |
ae64387a | 172 | generic_cleanup(port); |
1da177e4 LT |
173 | } |
174 | ||
715b1dc0 JW |
175 | static int usb_serial_multi_urb_write(struct tty_struct *tty, |
176 | struct usb_serial_port *port, const unsigned char *buf, int count) | |
177 | { | |
178 | unsigned long flags; | |
179 | struct urb *urb; | |
180 | unsigned char *buffer; | |
181 | int status; | |
182 | int towrite; | |
183 | int bwrite = 0; | |
184 | ||
185 | dbg("%s - port %d", __func__, port->number); | |
186 | ||
187 | if (count == 0) | |
188 | dbg("%s - write request of 0 bytes", __func__); | |
189 | ||
190 | while (count > 0) { | |
191 | towrite = (count > port->bulk_out_size) ? | |
192 | port->bulk_out_size : count; | |
193 | spin_lock_irqsave(&port->lock, flags); | |
194 | if (port->urbs_in_flight > | |
195 | port->serial->type->max_in_flight_urbs) { | |
196 | spin_unlock_irqrestore(&port->lock, flags); | |
197 | dbg("%s - write limit hit\n", __func__); | |
198 | return bwrite; | |
199 | } | |
200 | port->tx_bytes_flight += towrite; | |
201 | port->urbs_in_flight++; | |
202 | spin_unlock_irqrestore(&port->lock, flags); | |
203 | ||
204 | buffer = kmalloc(towrite, GFP_ATOMIC); | |
205 | if (!buffer) { | |
206 | dev_err(&port->dev, | |
207 | "%s ran out of kernel memory for urb ...\n", __func__); | |
208 | goto error_no_buffer; | |
209 | } | |
210 | ||
211 | urb = usb_alloc_urb(0, GFP_ATOMIC); | |
212 | if (!urb) { | |
213 | dev_err(&port->dev, "%s - no more free urbs\n", | |
214 | __func__); | |
215 | goto error_no_urb; | |
216 | } | |
217 | ||
218 | /* Copy data */ | |
219 | memcpy(buffer, buf + bwrite, towrite); | |
220 | usb_serial_debug_data(debug, &port->dev, __func__, | |
221 | towrite, buffer); | |
222 | /* fill the buffer and send it */ | |
223 | usb_fill_bulk_urb(urb, port->serial->dev, | |
224 | usb_sndbulkpipe(port->serial->dev, | |
225 | port->bulk_out_endpointAddress), | |
226 | buffer, towrite, | |
227 | usb_serial_generic_write_bulk_callback, port); | |
228 | ||
229 | status = usb_submit_urb(urb, GFP_ATOMIC); | |
230 | if (status) { | |
231 | dev_err(&port->dev, | |
232 | "%s - failed submitting write urb, error %d\n", | |
233 | __func__, status); | |
234 | goto error; | |
235 | } | |
236 | ||
237 | /* This urb is the responsibility of the host driver now */ | |
238 | usb_free_urb(urb); | |
239 | dbg("%s write: %d", __func__, towrite); | |
240 | count -= towrite; | |
241 | bwrite += towrite; | |
242 | } | |
243 | return bwrite; | |
244 | ||
245 | error: | |
246 | usb_free_urb(urb); | |
247 | error_no_urb: | |
248 | kfree(buffer); | |
249 | error_no_buffer: | |
250 | spin_lock_irqsave(&port->lock, flags); | |
251 | port->urbs_in_flight--; | |
252 | port->tx_bytes_flight -= towrite; | |
253 | spin_unlock_irqrestore(&port->lock, flags); | |
254 | return bwrite; | |
255 | } | |
256 | ||
8e8dce06 DV |
257 | /** |
258 | * usb_serial_generic_write_start - kick off an URB write | |
259 | * @port: Pointer to the &struct usb_serial_port data | |
260 | * | |
261 | * Returns the number of bytes queued on success. This will be zero if there | |
262 | * was nothing to send. Otherwise, it returns a negative errno value | |
263 | */ | |
264 | static int usb_serial_generic_write_start(struct usb_serial_port *port) | |
265 | { | |
266 | struct usb_serial *serial = port->serial; | |
267 | unsigned char *data; | |
268 | int result; | |
269 | int count; | |
270 | unsigned long flags; | |
271 | bool start_io; | |
272 | ||
273 | /* Atomically determine whether we can and need to start a USB | |
274 | * operation. */ | |
275 | spin_lock_irqsave(&port->lock, flags); | |
276 | if (port->write_urb_busy) | |
277 | start_io = false; | |
278 | else { | |
e64c026d | 279 | start_io = (kfifo_len(port->write_fifo) != 0); |
8e8dce06 DV |
280 | port->write_urb_busy = start_io; |
281 | } | |
282 | spin_unlock_irqrestore(&port->lock, flags); | |
283 | ||
284 | if (!start_io) | |
285 | return 0; | |
286 | ||
287 | data = port->write_urb->transfer_buffer; | |
7acd72eb | 288 | count = kfifo_out_locked(port->write_fifo, data, port->bulk_out_size, &port->lock); |
8e8dce06 DV |
289 | usb_serial_debug_data(debug, &port->dev, __func__, count, data); |
290 | ||
291 | /* set up our urb */ | |
292 | usb_fill_bulk_urb(port->write_urb, serial->dev, | |
293 | usb_sndbulkpipe(serial->dev, | |
294 | port->bulk_out_endpointAddress), | |
295 | port->write_urb->transfer_buffer, count, | |
296 | ((serial->type->write_bulk_callback) ? | |
297 | serial->type->write_bulk_callback : | |
298 | usb_serial_generic_write_bulk_callback), | |
299 | port); | |
300 | ||
301 | /* send the data out the bulk port */ | |
302 | result = usb_submit_urb(port->write_urb, GFP_ATOMIC); | |
303 | if (result) { | |
304 | dev_err(&port->dev, | |
305 | "%s - failed submitting write urb, error %d\n", | |
306 | __func__, result); | |
307 | /* don't have to grab the lock here, as we will | |
308 | retry if != 0 */ | |
309 | port->write_urb_busy = 0; | |
310 | } else | |
311 | result = count; | |
312 | ||
313 | return result; | |
314 | } | |
315 | ||
316 | /** | |
317 | * usb_serial_generic_write - generic write function for serial USB devices | |
318 | * @tty: Pointer to &struct tty_struct for the device | |
319 | * @port: Pointer to the &usb_serial_port structure for the device | |
320 | * @buf: Pointer to the data to write | |
321 | * @count: Number of bytes to write | |
322 | * | |
323 | * Returns the number of characters actually written, which may be anything | |
324 | * from zero to @count. If an error occurs, it returns the negative errno | |
325 | * value. | |
326 | */ | |
95da310e AC |
327 | int usb_serial_generic_write(struct tty_struct *tty, |
328 | struct usb_serial_port *port, const unsigned char *buf, int count) | |
1da177e4 LT |
329 | { |
330 | struct usb_serial *serial = port->serial; | |
331 | int result; | |
1da177e4 | 332 | |
441b62c1 | 333 | dbg("%s - port %d", __func__, port->number); |
1da177e4 LT |
334 | |
335 | if (count == 0) { | |
441b62c1 | 336 | dbg("%s - write request of 0 bytes", __func__); |
ae64387a | 337 | return 0; |
1da177e4 LT |
338 | } |
339 | ||
340 | /* only do something if we have a bulk out endpoint */ | |
8e8dce06 DV |
341 | if (!serial->num_bulk_out) |
342 | return 0; | |
1da177e4 | 343 | |
8e8dce06 DV |
344 | if (serial->type->max_in_flight_urbs) |
345 | return usb_serial_multi_urb_write(tty, port, | |
346 | buf, count); | |
1da177e4 | 347 | |
7acd72eb | 348 | count = kfifo_in_locked(port->write_fifo, buf, count, &port->lock); |
8e8dce06 | 349 | result = usb_serial_generic_write_start(port); |
1da177e4 | 350 | |
8e8dce06 DV |
351 | if (result >= 0) |
352 | result = count; | |
1da177e4 | 353 | |
8e8dce06 | 354 | return result; |
1da177e4 | 355 | } |
98fcb5f7 | 356 | EXPORT_SYMBOL_GPL(usb_serial_generic_write); |
1da177e4 | 357 | |
ae64387a | 358 | int usb_serial_generic_write_room(struct tty_struct *tty) |
1da177e4 | 359 | { |
95da310e | 360 | struct usb_serial_port *port = tty->driver_data; |
1da177e4 | 361 | struct usb_serial *serial = port->serial; |
715b1dc0 | 362 | unsigned long flags; |
1da177e4 LT |
363 | int room = 0; |
364 | ||
441b62c1 | 365 | dbg("%s - port %d", __func__, port->number); |
715b1dc0 JW |
366 | spin_lock_irqsave(&port->lock, flags); |
367 | if (serial->type->max_in_flight_urbs) { | |
368 | if (port->urbs_in_flight < serial->type->max_in_flight_urbs) | |
98fcb5f7 JW |
369 | room = port->bulk_out_size * |
370 | (serial->type->max_in_flight_urbs - | |
371 | port->urbs_in_flight); | |
8e8dce06 | 372 | } else if (serial->num_bulk_out) |
e64c026d | 373 | room = port->write_fifo->size - kfifo_len(port->write_fifo); |
715b1dc0 | 374 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 375 | |
441b62c1 | 376 | dbg("%s - returns %d", __func__, room); |
a5b6f60c | 377 | return room; |
1da177e4 LT |
378 | } |
379 | ||
95da310e | 380 | int usb_serial_generic_chars_in_buffer(struct tty_struct *tty) |
1da177e4 | 381 | { |
95da310e | 382 | struct usb_serial_port *port = tty->driver_data; |
1da177e4 LT |
383 | struct usb_serial *serial = port->serial; |
384 | int chars = 0; | |
715b1dc0 | 385 | unsigned long flags; |
1da177e4 | 386 | |
441b62c1 | 387 | dbg("%s - port %d", __func__, port->number); |
1da177e4 | 388 | |
715b1dc0 JW |
389 | if (serial->type->max_in_flight_urbs) { |
390 | spin_lock_irqsave(&port->lock, flags); | |
391 | chars = port->tx_bytes_flight; | |
392 | spin_unlock_irqrestore(&port->lock, flags); | |
8e8dce06 DV |
393 | } else if (serial->num_bulk_out) |
394 | chars = kfifo_len(port->write_fifo); | |
1da177e4 | 395 | |
441b62c1 | 396 | dbg("%s - returns %d", __func__, chars); |
95da310e | 397 | return chars; |
1da177e4 LT |
398 | } |
399 | ||
1abdeeb1 | 400 | |
98fcb5f7 JW |
401 | void usb_serial_generic_resubmit_read_urb(struct usb_serial_port *port, |
402 | gfp_t mem_flags) | |
1da177e4 | 403 | { |
253ca923 | 404 | struct urb *urb = port->read_urb; |
1abdeeb1 | 405 | struct usb_serial *serial = port->serial; |
1da177e4 LT |
406 | int result; |
407 | ||
253ca923 | 408 | /* Continue reading from device */ |
ae64387a AC |
409 | usb_fill_bulk_urb(urb, serial->dev, |
410 | usb_rcvbulkpipe(serial->dev, | |
411 | port->bulk_in_endpointAddress), | |
1abdeeb1 ON |
412 | urb->transfer_buffer, |
413 | urb->transfer_buffer_length, | |
ae64387a AC |
414 | ((serial->type->read_bulk_callback) ? |
415 | serial->type->read_bulk_callback : | |
1da177e4 | 416 | usb_serial_generic_read_bulk_callback), port); |
1abdeeb1 | 417 | result = usb_submit_urb(urb, mem_flags); |
1da177e4 | 418 | if (result) |
ae64387a AC |
419 | dev_err(&port->dev, |
420 | "%s - failed resubmitting read urb, error %d\n", | |
421 | __func__, result); | |
1da177e4 | 422 | } |
98fcb5f7 | 423 | EXPORT_SYMBOL_GPL(usb_serial_generic_resubmit_read_urb); |
253ca923 | 424 | |
1abdeeb1 | 425 | /* Push data to tty layer and resubmit the bulk read URB */ |
95da310e | 426 | static void flush_and_resubmit_read_urb(struct usb_serial_port *port) |
1abdeeb1 ON |
427 | { |
428 | struct urb *urb = port->read_urb; | |
4a90f09b | 429 | struct tty_struct *tty = tty_port_tty_get(&port->port); |
98fcb5f7 JW |
430 | char *ch = (char *)urb->transfer_buffer; |
431 | int i; | |
432 | ||
433 | if (!tty) | |
434 | goto done; | |
1abdeeb1 | 435 | |
4cd1de0a AC |
436 | /* The per character mucking around with sysrq path it too slow for |
437 | stuff like 3G modems, so shortcircuit it in the 99.9999999% of cases | |
438 | where the USB serial is not a console anyway */ | |
439 | if (!port->console || !port->sysrq) | |
440 | tty_insert_flip_string(tty, ch, urb->actual_length); | |
441 | else { | |
442 | /* Push data to tty */ | |
443 | for (i = 0; i < urb->actual_length; i++, ch++) { | |
24a15a62 | 444 | if (!usb_serial_handle_sysrq_char(tty, port, *ch)) |
4cd1de0a AC |
445 | tty_insert_flip_char(tty, *ch, TTY_NORMAL); |
446 | } | |
1abdeeb1 | 447 | } |
98fcb5f7 | 448 | tty_flip_buffer_push(tty); |
4a90f09b | 449 | tty_kref_put(tty); |
98fcb5f7 JW |
450 | done: |
451 | usb_serial_generic_resubmit_read_urb(port, GFP_ATOMIC); | |
1abdeeb1 ON |
452 | } |
453 | ||
95da310e | 454 | void usb_serial_generic_read_bulk_callback(struct urb *urb) |
253ca923 | 455 | { |
cdc97792 | 456 | struct usb_serial_port *port = urb->context; |
253ca923 | 457 | unsigned char *data = urb->transfer_buffer; |
fbd27225 | 458 | int status = urb->status; |
bfaeafcf | 459 | unsigned long flags; |
253ca923 | 460 | |
441b62c1 | 461 | dbg("%s - port %d", __func__, port->number); |
253ca923 | 462 | |
fbd27225 GKH |
463 | if (unlikely(status != 0)) { |
464 | dbg("%s - nonzero read bulk status received: %d", | |
441b62c1 | 465 | __func__, status); |
253ca923 JR |
466 | return; |
467 | } | |
468 | ||
ae64387a AC |
469 | usb_serial_debug_data(debug, &port->dev, __func__, |
470 | urb->actual_length, data); | |
253ca923 JR |
471 | |
472 | /* Throttle the device if requested by tty */ | |
bfaeafcf | 473 | spin_lock_irqsave(&port->lock, flags); |
ae64387a AC |
474 | port->throttled = port->throttle_req; |
475 | if (!port->throttled) { | |
b507cc97 | 476 | spin_unlock_irqrestore(&port->lock, flags); |
1abdeeb1 | 477 | flush_and_resubmit_read_urb(port); |
ae64387a | 478 | } else |
b507cc97 | 479 | spin_unlock_irqrestore(&port->lock, flags); |
253ca923 | 480 | } |
166ffccf | 481 | EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback); |
1da177e4 | 482 | |
95da310e | 483 | void usb_serial_generic_write_bulk_callback(struct urb *urb) |
1da177e4 | 484 | { |
715b1dc0 | 485 | unsigned long flags; |
cdc97792 | 486 | struct usb_serial_port *port = urb->context; |
fbd27225 | 487 | int status = urb->status; |
1da177e4 | 488 | |
441b62c1 | 489 | dbg("%s - port %d", __func__, port->number); |
1da177e4 | 490 | |
715b1dc0 JW |
491 | if (port->serial->type->max_in_flight_urbs) { |
492 | spin_lock_irqsave(&port->lock, flags); | |
493 | --port->urbs_in_flight; | |
494 | port->tx_bytes_flight -= urb->transfer_buffer_length; | |
495 | if (port->urbs_in_flight < 0) | |
496 | port->urbs_in_flight = 0; | |
497 | spin_unlock_irqrestore(&port->lock, flags); | |
8e8dce06 DV |
498 | |
499 | if (status) { | |
500 | dbg("%s - nonzero multi-urb write bulk status " | |
501 | "received: %d", __func__, status); | |
502 | return; | |
503 | } | |
715b1dc0 | 504 | } else { |
715b1dc0 | 505 | port->write_urb_busy = 0; |
715b1dc0 | 506 | |
8e8dce06 DV |
507 | if (status) { |
508 | dbg("%s - nonzero multi-urb write bulk status " | |
509 | "received: %d", __func__, status); | |
510 | kfifo_reset(port->write_fifo); | |
511 | } else | |
512 | usb_serial_generic_write_start(port); | |
1da177e4 | 513 | } |
8e8dce06 | 514 | |
cf2c7481 | 515 | usb_serial_port_softint(port); |
1da177e4 | 516 | } |
bb833986 | 517 | EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback); |
1da177e4 | 518 | |
95da310e | 519 | void usb_serial_generic_throttle(struct tty_struct *tty) |
253ca923 | 520 | { |
95da310e | 521 | struct usb_serial_port *port = tty->driver_data; |
253ca923 JR |
522 | unsigned long flags; |
523 | ||
441b62c1 | 524 | dbg("%s - port %d", __func__, port->number); |
253ca923 JR |
525 | |
526 | /* Set the throttle request flag. It will be picked up | |
527 | * by usb_serial_generic_read_bulk_callback(). */ | |
528 | spin_lock_irqsave(&port->lock, flags); | |
529 | port->throttle_req = 1; | |
530 | spin_unlock_irqrestore(&port->lock, flags); | |
531 | } | |
532 | ||
95da310e | 533 | void usb_serial_generic_unthrottle(struct tty_struct *tty) |
253ca923 | 534 | { |
95da310e | 535 | struct usb_serial_port *port = tty->driver_data; |
253ca923 JR |
536 | int was_throttled; |
537 | unsigned long flags; | |
538 | ||
441b62c1 | 539 | dbg("%s - port %d", __func__, port->number); |
253ca923 JR |
540 | |
541 | /* Clear the throttle flags */ | |
542 | spin_lock_irqsave(&port->lock, flags); | |
543 | was_throttled = port->throttled; | |
544 | port->throttled = port->throttle_req = 0; | |
545 | spin_unlock_irqrestore(&port->lock, flags); | |
546 | ||
547 | if (was_throttled) { | |
1abdeeb1 | 548 | /* Resume reading from device */ |
63a96095 | 549 | flush_and_resubmit_read_urb(port); |
253ca923 JR |
550 | } |
551 | } | |
552 | ||
24a15a62 AC |
553 | int usb_serial_handle_sysrq_char(struct tty_struct *tty, |
554 | struct usb_serial_port *port, unsigned int ch) | |
98fcb5f7 | 555 | { |
568d422e | 556 | if (port->sysrq && port->console) { |
98fcb5f7 | 557 | if (ch && time_before(jiffies, port->sysrq)) { |
24a15a62 | 558 | handle_sysrq(ch, tty); |
98fcb5f7 JW |
559 | port->sysrq = 0; |
560 | return 1; | |
561 | } | |
562 | port->sysrq = 0; | |
563 | } | |
564 | return 0; | |
565 | } | |
566 | EXPORT_SYMBOL_GPL(usb_serial_handle_sysrq_char); | |
567 | ||
568 | int usb_serial_handle_break(struct usb_serial_port *port) | |
569 | { | |
570 | if (!port->sysrq) { | |
571 | port->sysrq = jiffies + HZ*5; | |
572 | return 1; | |
573 | } | |
574 | port->sysrq = 0; | |
575 | return 0; | |
576 | } | |
577 | EXPORT_SYMBOL_GPL(usb_serial_handle_break); | |
578 | ||
8e8dce06 DV |
579 | int usb_serial_generic_resume(struct usb_serial *serial) |
580 | { | |
581 | struct usb_serial_port *port; | |
582 | int i, c = 0, r; | |
583 | ||
584 | for (i = 0; i < serial->num_ports; i++) { | |
585 | port = serial->port[i]; | |
586 | if (!port->port.count) | |
587 | continue; | |
588 | ||
589 | if (port->read_urb) { | |
590 | r = usb_submit_urb(port->read_urb, GFP_NOIO); | |
591 | if (r < 0) | |
592 | c++; | |
593 | } | |
594 | ||
595 | if (port->write_urb) { | |
596 | r = usb_serial_generic_write_start(port); | |
597 | if (r < 0) | |
598 | c++; | |
599 | } | |
600 | } | |
601 | ||
602 | return c ? -EIO : 0; | |
603 | } | |
604 | EXPORT_SYMBOL_GPL(usb_serial_generic_resume); | |
605 | ||
f9c99bb8 | 606 | void usb_serial_generic_disconnect(struct usb_serial *serial) |
1da177e4 LT |
607 | { |
608 | int i; | |
609 | ||
441b62c1 | 610 | dbg("%s", __func__); |
1da177e4 LT |
611 | |
612 | /* stop reads and writes on all ports */ | |
ae64387a | 613 | for (i = 0; i < serial->num_ports; ++i) |
1da177e4 | 614 | generic_cleanup(serial->port[i]); |
1da177e4 LT |
615 | } |
616 | ||
f9c99bb8 AS |
617 | void usb_serial_generic_release(struct usb_serial *serial) |
618 | { | |
619 | dbg("%s", __func__); | |
620 | } |