Commit | Line | Data |
---|---|---|
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 DB |
30 | |
31 | static int generic_probe(struct usb_interface *interface, | |
32 | const struct usb_device_id *id); | |
33 | ||
1da177e4 LT |
34 | static __u16 vendor = 0x05f9; |
35 | static __u16 product = 0xffff; | |
36 | ||
37 | module_param(vendor, ushort, 0); | |
38 | MODULE_PARM_DESC(vendor, "User specified USB idVendor"); | |
39 | ||
40 | module_param(product, ushort, 0); | |
41 | MODULE_PARM_DESC(product, "User specified USB idProduct"); | |
42 | ||
43 | static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */ | |
44 | ||
d9b1b787 JH |
45 | /* we want to look at all devices, as the vendor/product id can change |
46 | * depending on the command line argument */ | |
7d40d7e8 | 47 | static const struct usb_device_id generic_serial_ids[] = { |
d9b1b787 JH |
48 | {.driver_info = 42}, |
49 | {} | |
50 | }; | |
51 | ||
52 | static struct usb_driver generic_driver = { | |
53 | .name = "usbserial_generic", | |
54 | .probe = generic_probe, | |
55 | .disconnect = usb_serial_disconnect, | |
56 | .id_table = generic_serial_ids, | |
57 | .no_dynamic_id = 1, | |
58 | }; | |
59 | ||
1da177e4 | 60 | /* All of the device info needed for the Generic Serial Converter */ |
ea65370d | 61 | struct usb_serial_driver usb_serial_generic_device = { |
18fcac35 GKH |
62 | .driver = { |
63 | .owner = THIS_MODULE, | |
269bda1c | 64 | .name = "generic", |
18fcac35 | 65 | }, |
1da177e4 | 66 | .id_table = generic_device_ids, |
d9b1b787 | 67 | .usb_driver = &generic_driver, |
1da177e4 | 68 | .num_ports = 1, |
f9c99bb8 AS |
69 | .disconnect = usb_serial_generic_disconnect, |
70 | .release = usb_serial_generic_release, | |
253ca923 JR |
71 | .throttle = usb_serial_generic_throttle, |
72 | .unthrottle = usb_serial_generic_unthrottle, | |
ec22559e | 73 | .resume = usb_serial_generic_resume, |
1da177e4 LT |
74 | }; |
75 | ||
1da177e4 LT |
76 | static int generic_probe(struct usb_interface *interface, |
77 | const struct usb_device_id *id) | |
78 | { | |
79 | const struct usb_device_id *id_pattern; | |
80 | ||
81 | id_pattern = usb_match_id(interface, generic_device_ids); | |
82 | if (id_pattern != NULL) | |
83 | return usb_serial_probe(interface, id); | |
84 | return -ENODEV; | |
85 | } | |
1da177e4 LT |
86 | #endif |
87 | ||
ae64387a | 88 | int usb_serial_generic_register(int _debug) |
1da177e4 LT |
89 | { |
90 | int retval = 0; | |
91 | ||
92 | debug = _debug; | |
93 | #ifdef CONFIG_USB_SERIAL_GENERIC | |
94 | generic_device_ids[0].idVendor = vendor; | |
95 | generic_device_ids[0].idProduct = product; | |
ae64387a AC |
96 | generic_device_ids[0].match_flags = |
97 | USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT; | |
1da177e4 LT |
98 | |
99 | /* register our generic driver with ourselves */ | |
ae64387a | 100 | retval = usb_serial_register(&usb_serial_generic_device); |
1da177e4 LT |
101 | if (retval) |
102 | goto exit; | |
103 | retval = usb_register(&generic_driver); | |
104 | if (retval) | |
105 | usb_serial_deregister(&usb_serial_generic_device); | |
106 | exit: | |
107 | #endif | |
108 | return retval; | |
109 | } | |
110 | ||
ae64387a | 111 | void usb_serial_generic_deregister(void) |
1da177e4 LT |
112 | { |
113 | #ifdef CONFIG_USB_SERIAL_GENERIC | |
114 | /* remove our generic driver */ | |
115 | usb_deregister(&generic_driver); | |
ae64387a | 116 | usb_serial_deregister(&usb_serial_generic_device); |
1da177e4 LT |
117 | #endif |
118 | } | |
119 | ||
a509a7e4 | 120 | int usb_serial_generic_open(struct tty_struct *tty, struct usb_serial_port *port) |
1da177e4 | 121 | { |
1da177e4 | 122 | int result = 0; |
253ca923 | 123 | unsigned long flags; |
1da177e4 | 124 | |
441b62c1 | 125 | dbg("%s - port %d", __func__, port->number); |
1da177e4 | 126 | |
253ca923 JR |
127 | /* clear the throttle flags */ |
128 | spin_lock_irqsave(&port->lock, flags); | |
129 | port->throttled = 0; | |
130 | port->throttle_req = 0; | |
131 | spin_unlock_irqrestore(&port->lock, flags); | |
132 | ||
133 | /* if we have a bulk endpoint, start reading from it */ | |
41bd72f9 | 134 | if (port->bulk_in_size) |
d83b4053 | 135 | result = usb_serial_generic_submit_read_urbs(port, GFP_KERNEL); |
1da177e4 LT |
136 | |
137 | return result; | |
138 | } | |
815ddc99 | 139 | EXPORT_SYMBOL_GPL(usb_serial_generic_open); |
1da177e4 | 140 | |
95da310e | 141 | static void generic_cleanup(struct usb_serial_port *port) |
1da177e4 LT |
142 | { |
143 | struct usb_serial *serial = port->serial; | |
ec3ee508 | 144 | unsigned long flags; |
27c7acf2 | 145 | int i; |
1da177e4 | 146 | |
441b62c1 | 147 | dbg("%s - port %d", __func__, port->number); |
1da177e4 LT |
148 | |
149 | if (serial->dev) { | |
eb8878a8 | 150 | /* shutdown any bulk transfers that might be going on */ |
ec3ee508 | 151 | if (port->bulk_out_size) { |
1da177e4 | 152 | usb_kill_urb(port->write_urb); |
27c7acf2 JH |
153 | for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) |
154 | usb_kill_urb(port->write_urbs[i]); | |
ec3ee508 JH |
155 | |
156 | spin_lock_irqsave(&port->lock, flags); | |
157 | kfifo_reset_out(&port->write_fifo); | |
158 | spin_unlock_irqrestore(&port->lock, flags); | |
159 | } | |
d83b4053 JH |
160 | if (port->bulk_in_size) { |
161 | for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) | |
162 | usb_kill_urb(port->read_urbs[i]); | |
163 | } | |
1da177e4 LT |
164 | } |
165 | } | |
166 | ||
335f8514 | 167 | void usb_serial_generic_close(struct usb_serial_port *port) |
1da177e4 | 168 | { |
441b62c1 | 169 | dbg("%s - port %d", __func__, port->number); |
ae64387a | 170 | generic_cleanup(port); |
1da177e4 | 171 | } |
f26788da | 172 | EXPORT_SYMBOL_GPL(usb_serial_generic_close); |
1da177e4 | 173 | |
eaa3bcb0 | 174 | int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port, |
c23e5fc1 | 175 | void *dest, size_t size) |
eaa3bcb0 | 176 | { |
c23e5fc1 | 177 | return kfifo_out_locked(&port->write_fifo, dest, size, &port->lock); |
715b1dc0 JW |
178 | } |
179 | ||
8e8dce06 DV |
180 | /** |
181 | * usb_serial_generic_write_start - kick off an URB write | |
182 | * @port: Pointer to the &struct usb_serial_port data | |
183 | * | |
27c7acf2 | 184 | * Returns zero on success, or a negative errno value |
8e8dce06 DV |
185 | */ |
186 | static int usb_serial_generic_write_start(struct usb_serial_port *port) | |
187 | { | |
27c7acf2 JH |
188 | struct urb *urb; |
189 | int count, result; | |
8e8dce06 | 190 | unsigned long flags; |
27c7acf2 | 191 | int i; |
8e8dce06 | 192 | |
27c7acf2 JH |
193 | if (test_and_set_bit_lock(USB_SERIAL_WRITE_BUSY, &port->flags)) |
194 | return 0; | |
195 | retry: | |
8e8dce06 | 196 | spin_lock_irqsave(&port->lock, flags); |
27c7acf2 JH |
197 | if (!port->write_urbs_free || !kfifo_len(&port->write_fifo)) { |
198 | clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags); | |
50a5f70c JH |
199 | spin_unlock_irqrestore(&port->lock, flags); |
200 | return 0; | |
8e8dce06 | 201 | } |
27c7acf2 JH |
202 | i = (int)find_first_bit(&port->write_urbs_free, |
203 | ARRAY_SIZE(port->write_urbs)); | |
8e8dce06 DV |
204 | spin_unlock_irqrestore(&port->lock, flags); |
205 | ||
27c7acf2 | 206 | urb = port->write_urbs[i]; |
eaa3bcb0 | 207 | count = port->serial->type->prepare_write_buffer(port, |
c23e5fc1 JH |
208 | urb->transfer_buffer, |
209 | port->bulk_out_size); | |
27c7acf2 JH |
210 | urb->transfer_buffer_length = count; |
211 | usb_serial_debug_data(debug, &port->dev, __func__, count, | |
212 | urb->transfer_buffer); | |
b58af406 JH |
213 | spin_lock_irqsave(&port->lock, flags); |
214 | port->tx_bytes += count; | |
215 | spin_unlock_irqrestore(&port->lock, flags); | |
216 | ||
217 | clear_bit(i, &port->write_urbs_free); | |
27c7acf2 | 218 | result = usb_submit_urb(urb, GFP_ATOMIC); |
8e8dce06 | 219 | if (result) { |
1a1405e2 | 220 | dev_err(&port->dev, "%s - error submitting urb: %d\n", |
8e8dce06 | 221 | __func__, result); |
b58af406 JH |
222 | set_bit(i, &port->write_urbs_free); |
223 | spin_lock_irqsave(&port->lock, flags); | |
224 | port->tx_bytes -= count; | |
225 | spin_unlock_irqrestore(&port->lock, flags); | |
226 | ||
27c7acf2 | 227 | clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags); |
30af7fb5 JH |
228 | return result; |
229 | } | |
30af7fb5 | 230 | |
27c7acf2 JH |
231 | /* Try sending off another urb, unless in irq context (in which case |
232 | * there will be no free urb). */ | |
233 | if (!in_irq()) | |
234 | goto retry; | |
235 | ||
236 | clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags); | |
237 | ||
238 | return 0; | |
8e8dce06 DV |
239 | } |
240 | ||
241 | /** | |
242 | * usb_serial_generic_write - generic write function for serial USB devices | |
243 | * @tty: Pointer to &struct tty_struct for the device | |
244 | * @port: Pointer to the &usb_serial_port structure for the device | |
245 | * @buf: Pointer to the data to write | |
246 | * @count: Number of bytes to write | |
247 | * | |
248 | * Returns the number of characters actually written, which may be anything | |
249 | * from zero to @count. If an error occurs, it returns the negative errno | |
250 | * value. | |
251 | */ | |
95da310e AC |
252 | int usb_serial_generic_write(struct tty_struct *tty, |
253 | struct usb_serial_port *port, const unsigned char *buf, int count) | |
1da177e4 | 254 | { |
1da177e4 | 255 | int result; |
1da177e4 | 256 | |
441b62c1 | 257 | dbg("%s - port %d", __func__, port->number); |
1da177e4 | 258 | |
eb8878a8 JH |
259 | /* only do something if we have a bulk out endpoint */ |
260 | if (!port->bulk_out_size) | |
261 | return -ENODEV; | |
262 | ||
1a1405e2 | 263 | if (!count) |
ae64387a | 264 | return 0; |
1da177e4 | 265 | |
119eecc8 | 266 | count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); |
8e8dce06 | 267 | result = usb_serial_generic_write_start(port); |
c23e5fc1 JH |
268 | if (result) |
269 | return result; | |
1da177e4 | 270 | |
c23e5fc1 | 271 | return count; |
1da177e4 | 272 | } |
98fcb5f7 | 273 | EXPORT_SYMBOL_GPL(usb_serial_generic_write); |
1da177e4 | 274 | |
ae64387a | 275 | int usb_serial_generic_write_room(struct tty_struct *tty) |
1da177e4 | 276 | { |
95da310e | 277 | struct usb_serial_port *port = tty->driver_data; |
715b1dc0 | 278 | unsigned long flags; |
25d514ca | 279 | int room; |
1da177e4 | 280 | |
441b62c1 | 281 | dbg("%s - port %d", __func__, port->number); |
eb8878a8 JH |
282 | |
283 | if (!port->bulk_out_size) | |
284 | return 0; | |
285 | ||
715b1dc0 | 286 | spin_lock_irqsave(&port->lock, flags); |
c23e5fc1 | 287 | room = kfifo_avail(&port->write_fifo); |
715b1dc0 | 288 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 289 | |
441b62c1 | 290 | dbg("%s - returns %d", __func__, room); |
a5b6f60c | 291 | return room; |
1da177e4 LT |
292 | } |
293 | ||
95da310e | 294 | int usb_serial_generic_chars_in_buffer(struct tty_struct *tty) |
1da177e4 | 295 | { |
95da310e | 296 | struct usb_serial_port *port = tty->driver_data; |
715b1dc0 | 297 | unsigned long flags; |
eb8878a8 | 298 | int chars; |
1da177e4 | 299 | |
441b62c1 | 300 | dbg("%s - port %d", __func__, port->number); |
1da177e4 | 301 | |
eb8878a8 JH |
302 | if (!port->bulk_out_size) |
303 | return 0; | |
304 | ||
25719e6b | 305 | spin_lock_irqsave(&port->lock, flags); |
c23e5fc1 | 306 | chars = kfifo_len(&port->write_fifo) + port->tx_bytes; |
25719e6b | 307 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 308 | |
441b62c1 | 309 | dbg("%s - returns %d", __func__, chars); |
95da310e | 310 | return chars; |
1da177e4 LT |
311 | } |
312 | ||
d83b4053 JH |
313 | static int usb_serial_generic_submit_read_urb(struct usb_serial_port *port, |
314 | int index, gfp_t mem_flags) | |
315 | { | |
316 | int res; | |
317 | ||
318 | if (!test_and_clear_bit(index, &port->read_urbs_free)) | |
319 | return 0; | |
320 | ||
321 | dbg("%s - port %d, urb %d\n", __func__, port->number, index); | |
322 | ||
323 | res = usb_submit_urb(port->read_urbs[index], mem_flags); | |
324 | if (res) { | |
325 | if (res != -EPERM) { | |
326 | dev_err(&port->dev, | |
327 | "%s - usb_submit_urb failed: %d\n", | |
328 | __func__, res); | |
329 | } | |
330 | set_bit(index, &port->read_urbs_free); | |
331 | return res; | |
332 | } | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | int usb_serial_generic_submit_read_urbs(struct usb_serial_port *port, | |
41bd72f9 | 338 | gfp_t mem_flags) |
1da177e4 | 339 | { |
d83b4053 JH |
340 | int res; |
341 | int i; | |
1da177e4 | 342 | |
d83b4053 JH |
343 | dbg("%s - port %d", __func__, port->number); |
344 | ||
345 | for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) { | |
346 | res = usb_serial_generic_submit_read_urb(port, i, mem_flags); | |
347 | if (res) | |
348 | goto err; | |
0ae14743 | 349 | } |
d83b4053 JH |
350 | |
351 | return 0; | |
352 | err: | |
353 | for (; i >= 0; --i) | |
354 | usb_kill_urb(port->read_urbs[i]); | |
355 | ||
356 | return res; | |
1da177e4 | 357 | } |
d83b4053 | 358 | EXPORT_SYMBOL_GPL(usb_serial_generic_submit_read_urbs); |
253ca923 | 359 | |
23154320 | 360 | void usb_serial_generic_process_read_urb(struct urb *urb) |
1abdeeb1 | 361 | { |
0f3d5bae JH |
362 | struct usb_serial_port *port = urb->context; |
363 | struct tty_struct *tty; | |
98fcb5f7 JW |
364 | char *ch = (char *)urb->transfer_buffer; |
365 | int i; | |
366 | ||
56a1df46 JH |
367 | if (!urb->actual_length) |
368 | return; | |
369 | ||
0f3d5bae | 370 | tty = tty_port_tty_get(&port->port); |
98fcb5f7 | 371 | if (!tty) |
0f3d5bae | 372 | return; |
1abdeeb1 | 373 | |
4cd1de0a AC |
374 | /* The per character mucking around with sysrq path it too slow for |
375 | stuff like 3G modems, so shortcircuit it in the 99.9999999% of cases | |
376 | where the USB serial is not a console anyway */ | |
bd5afa9e | 377 | if (!port->port.console || !port->sysrq) |
4cd1de0a AC |
378 | tty_insert_flip_string(tty, ch, urb->actual_length); |
379 | else { | |
4cd1de0a | 380 | for (i = 0; i < urb->actual_length; i++, ch++) { |
6ee9f4b4 | 381 | if (!usb_serial_handle_sysrq_char(port, *ch)) |
4cd1de0a AC |
382 | tty_insert_flip_char(tty, *ch, TTY_NORMAL); |
383 | } | |
1abdeeb1 | 384 | } |
98fcb5f7 | 385 | tty_flip_buffer_push(tty); |
4a90f09b | 386 | tty_kref_put(tty); |
1abdeeb1 | 387 | } |
23154320 | 388 | EXPORT_SYMBOL_GPL(usb_serial_generic_process_read_urb); |
1abdeeb1 | 389 | |
95da310e | 390 | void usb_serial_generic_read_bulk_callback(struct urb *urb) |
253ca923 | 391 | { |
cdc97792 | 392 | struct usb_serial_port *port = urb->context; |
253ca923 | 393 | unsigned char *data = urb->transfer_buffer; |
bfaeafcf | 394 | unsigned long flags; |
d83b4053 | 395 | int i; |
253ca923 | 396 | |
d83b4053 JH |
397 | for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) { |
398 | if (urb == port->read_urbs[i]) | |
399 | break; | |
400 | } | |
401 | set_bit(i, &port->read_urbs_free); | |
253ca923 | 402 | |
d83b4053 JH |
403 | dbg("%s - port %d, urb %d, len %d\n", __func__, port->number, i, |
404 | urb->actual_length); | |
405 | if (urb->status) { | |
406 | dbg("%s - non-zero urb status: %d\n", __func__, urb->status); | |
253ca923 JR |
407 | return; |
408 | } | |
409 | ||
ae64387a AC |
410 | usb_serial_debug_data(debug, &port->dev, __func__, |
411 | urb->actual_length, data); | |
23154320 | 412 | port->serial->type->process_read_urb(urb); |
253ca923 JR |
413 | |
414 | /* Throttle the device if requested by tty */ | |
bfaeafcf | 415 | spin_lock_irqsave(&port->lock, flags); |
ae64387a AC |
416 | port->throttled = port->throttle_req; |
417 | if (!port->throttled) { | |
b507cc97 | 418 | spin_unlock_irqrestore(&port->lock, flags); |
d83b4053 | 419 | usb_serial_generic_submit_read_urb(port, i, GFP_ATOMIC); |
ae64387a | 420 | } else |
b507cc97 | 421 | spin_unlock_irqrestore(&port->lock, flags); |
253ca923 | 422 | } |
166ffccf | 423 | EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback); |
1da177e4 | 424 | |
95da310e | 425 | void usb_serial_generic_write_bulk_callback(struct urb *urb) |
1da177e4 | 426 | { |
715b1dc0 | 427 | unsigned long flags; |
cdc97792 | 428 | struct usb_serial_port *port = urb->context; |
fbd27225 | 429 | int status = urb->status; |
27c7acf2 | 430 | int i; |
1da177e4 | 431 | |
441b62c1 | 432 | dbg("%s - port %d", __func__, port->number); |
1da177e4 | 433 | |
c23e5fc1 JH |
434 | for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) |
435 | if (port->write_urbs[i] == urb) | |
436 | break; | |
25915302 | 437 | |
c23e5fc1 JH |
438 | spin_lock_irqsave(&port->lock, flags); |
439 | port->tx_bytes -= urb->transfer_buffer_length; | |
440 | set_bit(i, &port->write_urbs_free); | |
441 | spin_unlock_irqrestore(&port->lock, flags); | |
442 | ||
443 | if (status) { | |
444 | dbg("%s - non-zero urb status: %d", __func__, status); | |
27c7acf2 | 445 | |
30af7fb5 | 446 | spin_lock_irqsave(&port->lock, flags); |
c23e5fc1 | 447 | kfifo_reset_out(&port->write_fifo); |
30af7fb5 | 448 | spin_unlock_irqrestore(&port->lock, flags); |
c23e5fc1 JH |
449 | } else { |
450 | usb_serial_generic_write_start(port); | |
1da177e4 | 451 | } |
8e8dce06 | 452 | |
cf2c7481 | 453 | usb_serial_port_softint(port); |
1da177e4 | 454 | } |
bb833986 | 455 | EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback); |
1da177e4 | 456 | |
95da310e | 457 | void usb_serial_generic_throttle(struct tty_struct *tty) |
253ca923 | 458 | { |
95da310e | 459 | struct usb_serial_port *port = tty->driver_data; |
253ca923 JR |
460 | unsigned long flags; |
461 | ||
441b62c1 | 462 | dbg("%s - port %d", __func__, port->number); |
253ca923 JR |
463 | |
464 | /* Set the throttle request flag. It will be picked up | |
465 | * by usb_serial_generic_read_bulk_callback(). */ | |
466 | spin_lock_irqsave(&port->lock, flags); | |
467 | port->throttle_req = 1; | |
468 | spin_unlock_irqrestore(&port->lock, flags); | |
469 | } | |
f1e949ac | 470 | EXPORT_SYMBOL_GPL(usb_serial_generic_throttle); |
253ca923 | 471 | |
95da310e | 472 | void usb_serial_generic_unthrottle(struct tty_struct *tty) |
253ca923 | 473 | { |
95da310e | 474 | struct usb_serial_port *port = tty->driver_data; |
253ca923 | 475 | int was_throttled; |
253ca923 | 476 | |
441b62c1 | 477 | dbg("%s - port %d", __func__, port->number); |
253ca923 JR |
478 | |
479 | /* Clear the throttle flags */ | |
0f3d5bae | 480 | spin_lock_irq(&port->lock); |
253ca923 JR |
481 | was_throttled = port->throttled; |
482 | port->throttled = port->throttle_req = 0; | |
0f3d5bae | 483 | spin_unlock_irq(&port->lock); |
253ca923 | 484 | |
0f3d5bae | 485 | if (was_throttled) |
d83b4053 | 486 | usb_serial_generic_submit_read_urbs(port, GFP_KERNEL); |
253ca923 | 487 | } |
f1e949ac | 488 | EXPORT_SYMBOL_GPL(usb_serial_generic_unthrottle); |
253ca923 | 489 | |
7f0ae3a8 | 490 | #ifdef CONFIG_MAGIC_SYSRQ |
6ee9f4b4 | 491 | int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch) |
98fcb5f7 | 492 | { |
bd5afa9e | 493 | if (port->sysrq && port->port.console) { |
98fcb5f7 | 494 | if (ch && time_before(jiffies, port->sysrq)) { |
f335397d | 495 | handle_sysrq(ch); |
98fcb5f7 JW |
496 | port->sysrq = 0; |
497 | return 1; | |
498 | } | |
499 | port->sysrq = 0; | |
500 | } | |
501 | return 0; | |
502 | } | |
7f0ae3a8 | 503 | #else |
6ee9f4b4 | 504 | int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch) |
7f0ae3a8 RD |
505 | { |
506 | return 0; | |
507 | } | |
508 | #endif | |
98fcb5f7 JW |
509 | EXPORT_SYMBOL_GPL(usb_serial_handle_sysrq_char); |
510 | ||
511 | int usb_serial_handle_break(struct usb_serial_port *port) | |
512 | { | |
513 | if (!port->sysrq) { | |
514 | port->sysrq = jiffies + HZ*5; | |
515 | return 1; | |
516 | } | |
517 | port->sysrq = 0; | |
518 | return 0; | |
519 | } | |
520 | EXPORT_SYMBOL_GPL(usb_serial_handle_break); | |
521 | ||
d14fc1a7 LP |
522 | /** |
523 | * usb_serial_handle_dcd_change - handle a change of carrier detect state | |
524 | * @port: usb_serial_port structure for the open port | |
525 | * @tty: tty_struct structure for the port | |
526 | * @status: new carrier detect status, nonzero if active | |
527 | */ | |
528 | void usb_serial_handle_dcd_change(struct usb_serial_port *usb_port, | |
529 | struct tty_struct *tty, unsigned int status) | |
530 | { | |
531 | struct tty_port *port = &usb_port->port; | |
532 | ||
533 | dbg("%s - port %d, status %d", __func__, usb_port->number, status); | |
534 | ||
535 | if (status) | |
536 | wake_up_interruptible(&port->open_wait); | |
537 | else if (tty && !C_CLOCAL(tty)) | |
538 | tty_hangup(tty); | |
539 | } | |
540 | EXPORT_SYMBOL_GPL(usb_serial_handle_dcd_change); | |
541 | ||
8e8dce06 DV |
542 | int usb_serial_generic_resume(struct usb_serial *serial) |
543 | { | |
544 | struct usb_serial_port *port; | |
545 | int i, c = 0, r; | |
546 | ||
547 | for (i = 0; i < serial->num_ports; i++) { | |
548 | port = serial->port[i]; | |
1f87158e | 549 | if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags)) |
8e8dce06 DV |
550 | continue; |
551 | ||
d83b4053 JH |
552 | if (port->bulk_in_size) { |
553 | r = usb_serial_generic_submit_read_urbs(port, | |
554 | GFP_NOIO); | |
8e8dce06 DV |
555 | if (r < 0) |
556 | c++; | |
557 | } | |
558 | ||
27c7acf2 | 559 | if (port->bulk_out_size) { |
8e8dce06 DV |
560 | r = usb_serial_generic_write_start(port); |
561 | if (r < 0) | |
562 | c++; | |
563 | } | |
564 | } | |
565 | ||
566 | return c ? -EIO : 0; | |
567 | } | |
568 | EXPORT_SYMBOL_GPL(usb_serial_generic_resume); | |
569 | ||
f9c99bb8 | 570 | void usb_serial_generic_disconnect(struct usb_serial *serial) |
1da177e4 LT |
571 | { |
572 | int i; | |
573 | ||
441b62c1 | 574 | dbg("%s", __func__); |
1da177e4 LT |
575 | |
576 | /* stop reads and writes on all ports */ | |
ae64387a | 577 | for (i = 0; i < serial->num_ports; ++i) |
1da177e4 | 578 | generic_cleanup(serial->port[i]); |
1da177e4 | 579 | } |
5c7efeb7 | 580 | EXPORT_SYMBOL_GPL(usb_serial_generic_disconnect); |
1da177e4 | 581 | |
f9c99bb8 AS |
582 | void usb_serial_generic_release(struct usb_serial *serial) |
583 | { | |
584 | dbg("%s", __func__); | |
585 | } |