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sched: Remove double_rq_lock() from __migrate_task()
[linux/fpc-iii.git] / drivers / media / rc / streamzap.c
blobbd5e4ff9e0ba08213ccfef975318b84ebdef19c9
1 /*
2 * Streamzap Remote Control driver
3 *
4 * Copyright (c) 2005 Christoph Bartelmus <lirc@bartelmus.de>
5 * Copyright (c) 2010 Jarod Wilson <jarod@wilsonet.com>
6 *
7 * This driver was based on the work of Greg Wickham and Adrian
8 * Dewhurst. It was substantially rewritten to support correct signal
9 * gaps and now maintains a delay buffer, which is used to present
10 * consistent timing behaviour to user space applications. Without the
11 * delay buffer an ugly hack would be required in lircd, which can
12 * cause sluggish signal decoding in certain situations.
13 *
14 * Ported to in-kernel ir-core interface by Jarod Wilson
15 *
16 * This driver is based on the USB skeleton driver packaged with the
17 * kernel; copyright (C) 2001-2003 Greg Kroah-Hartman (greg@kroah.com)
18 *
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
23 *
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 */
33
34 #include <linux/device.h>
35 #include <linux/module.h>
36 #include <linux/slab.h>
37 #include <linux/usb.h>
38 #include <linux/usb/input.h>
39 #include <media/rc-core.h>
40
41 #define DRIVER_VERSION "1.61"
42 #define DRIVER_NAME "streamzap"
43 #define DRIVER_DESC "Streamzap Remote Control driver"
44
45 #define USB_STREAMZAP_VENDOR_ID 0x0e9c
46 #define USB_STREAMZAP_PRODUCT_ID 0x0000
47
48 /* table of devices that work with this driver */
49 static struct usb_device_id streamzap_table[] = {
50 /* Streamzap Remote Control */
51 { USB_DEVICE(USB_STREAMZAP_VENDOR_ID, USB_STREAMZAP_PRODUCT_ID) },
52 /* Terminating entry */
53 { }
54 };
55
56 MODULE_DEVICE_TABLE(usb, streamzap_table);
57
58 #define SZ_PULSE_MASK 0xf0
59 #define SZ_SPACE_MASK 0x0f
60 #define SZ_TIMEOUT 0xff
61 #define SZ_RESOLUTION 256
62
63 /* number of samples buffered */
64 #define SZ_BUF_LEN 128
65
66 /* from ir-rc5-sz-decoder.c */
67 #ifdef CONFIG_IR_RC5_SZ_DECODER_MODULE
68 #define load_rc5_sz_decode() request_module("ir-rc5-sz-decoder")
69 #else
70 #define load_rc5_sz_decode() {}
71 #endif
72
73 enum StreamzapDecoderState {
74 PulseSpace,
75 FullPulse,
76 FullSpace,
77 IgnorePulse
78 };
79
80 /* structure to hold our device specific stuff */
81 struct streamzap_ir {
82 /* ir-core */
83 struct rc_dev *rdev;
84
85 /* core device info */
86 struct device *dev;
87
88 /* usb */
89 struct usb_device *usbdev;
90 struct usb_interface *interface;
91 struct usb_endpoint_descriptor *endpoint;
92 struct urb *urb_in;
93
94 /* buffer & dma */
95 unsigned char *buf_in;
96 dma_addr_t dma_in;
97 unsigned int buf_in_len;
98
99 /* track what state we're in */
100 enum StreamzapDecoderState decoder_state;
101 /* tracks whether we are currently receiving some signal */
102 bool idle;
103 /* sum of signal lengths received since signal start */
104 unsigned long sum;
105 /* start time of signal; necessary for gap tracking */
106 struct timeval signal_last;
107 struct timeval signal_start;
108 bool timeout_enabled;
109
110 char name[128];
111 char phys[64];
112 };
113
114
115 /* local function prototypes */
116 static int streamzap_probe(struct usb_interface *interface,
117 const struct usb_device_id *id);
118 static void streamzap_disconnect(struct usb_interface *interface);
119 static void streamzap_callback(struct urb *urb);
120 static int streamzap_suspend(struct usb_interface *intf, pm_message_t message);
121 static int streamzap_resume(struct usb_interface *intf);
122
123 /* usb specific object needed to register this driver with the usb subsystem */
124 static struct usb_driver streamzap_driver = {
125 .name = DRIVER_NAME,
126 .probe = streamzap_probe,
127 .disconnect = streamzap_disconnect,
128 .suspend = streamzap_suspend,
129 .resume = streamzap_resume,
130 .id_table = streamzap_table,
131 };
132
133 static void sz_push(struct streamzap_ir *sz, struct ir_raw_event rawir)
134 {
135 dev_dbg(sz->dev, "Storing %s with duration %u us\n",
136 (rawir.pulse ? "pulse" : "space"), rawir.duration);
137 ir_raw_event_store_with_filter(sz->rdev, &rawir);
138 }
139
140 static void sz_push_full_pulse(struct streamzap_ir *sz,
141 unsigned char value)
142 {
143 DEFINE_IR_RAW_EVENT(rawir);
144
145 if (sz->idle) {
146 long deltv;
147
148 sz->signal_last = sz->signal_start;
149 do_gettimeofday(&sz->signal_start);
150
151 deltv = sz->signal_start.tv_sec - sz->signal_last.tv_sec;
152 rawir.pulse = false;
153 if (deltv > 15) {
154 /* really long time */
155 rawir.duration = IR_MAX_DURATION;
156 } else {
157 rawir.duration = (int)(deltv * 1000000 +
158 sz->signal_start.tv_usec -
159 sz->signal_last.tv_usec);
160 rawir.duration -= sz->sum;
161 rawir.duration = US_TO_NS(rawir.duration);
162 rawir.duration &= IR_MAX_DURATION;
163 }
164 sz_push(sz, rawir);
165
166 sz->idle = false;
167 sz->sum = 0;
168 }
169
170 rawir.pulse = true;
171 rawir.duration = ((int) value) * SZ_RESOLUTION;
172 rawir.duration += SZ_RESOLUTION / 2;
173 sz->sum += rawir.duration;
174 rawir.duration = US_TO_NS(rawir.duration);
175 rawir.duration &= IR_MAX_DURATION;
176 sz_push(sz, rawir);
177 }
178
179 static void sz_push_half_pulse(struct streamzap_ir *sz,
180 unsigned char value)
181 {
182 sz_push_full_pulse(sz, (value & SZ_PULSE_MASK) >> 4);
183 }
184
185 static void sz_push_full_space(struct streamzap_ir *sz,
186 unsigned char value)
187 {
188 DEFINE_IR_RAW_EVENT(rawir);
189
190 rawir.pulse = false;
191 rawir.duration = ((int) value) * SZ_RESOLUTION;
192 rawir.duration += SZ_RESOLUTION / 2;
193 sz->sum += rawir.duration;
194 rawir.duration = US_TO_NS(rawir.duration);
195 sz_push(sz, rawir);
196 }
197
198 static void sz_push_half_space(struct streamzap_ir *sz,
199 unsigned long value)
200 {
201 sz_push_full_space(sz, value & SZ_SPACE_MASK);
202 }
203
204 /**
205 * streamzap_callback - usb IRQ handler callback
206 *
207 * This procedure is invoked on reception of data from
208 * the usb remote.
209 */
210 static void streamzap_callback(struct urb *urb)
211 {
212 struct streamzap_ir *sz;
213 unsigned int i;
214 int len;
215
216 if (!urb)
217 return;
218
219 sz = urb->context;
220 len = urb->actual_length;
221
222 switch (urb->status) {
223 case -ECONNRESET:
224 case -ENOENT:
225 case -ESHUTDOWN:
226 /*
227 * this urb is terminated, clean up.
228 * sz might already be invalid at this point
229 */
230 dev_err(sz->dev, "urb terminated, status: %d\n", urb->status);
231 return;
232 default:
233 break;
234 }
235
236 dev_dbg(sz->dev, "%s: received urb, len %d\n", __func__, len);
237 for (i = 0; i < len; i++) {
238 dev_dbg(sz->dev, "sz->buf_in[%d]: %x\n",
239 i, (unsigned char)sz->buf_in[i]);
240 switch (sz->decoder_state) {
241 case PulseSpace:
242 if ((sz->buf_in[i] & SZ_PULSE_MASK) ==
243 SZ_PULSE_MASK) {
244 sz->decoder_state = FullPulse;
245 continue;
246 } else if ((sz->buf_in[i] & SZ_SPACE_MASK)
247 == SZ_SPACE_MASK) {
248 sz_push_half_pulse(sz, sz->buf_in[i]);
249 sz->decoder_state = FullSpace;
250 continue;
251 } else {
252 sz_push_half_pulse(sz, sz->buf_in[i]);
253 sz_push_half_space(sz, sz->buf_in[i]);
254 }
255 break;
256 case FullPulse:
257 sz_push_full_pulse(sz, sz->buf_in[i]);
258 sz->decoder_state = IgnorePulse;
259 break;
260 case FullSpace:
261 if (sz->buf_in[i] == SZ_TIMEOUT) {
262 DEFINE_IR_RAW_EVENT(rawir);
263
264 rawir.pulse = false;
265 rawir.duration = sz->rdev->timeout;
266 sz->idle = true;
267 if (sz->timeout_enabled)
268 sz_push(sz, rawir);
269 ir_raw_event_handle(sz->rdev);
270 ir_raw_event_reset(sz->rdev);
271 } else {
272 sz_push_full_space(sz, sz->buf_in[i]);
273 }
274 sz->decoder_state = PulseSpace;
275 break;
276 case IgnorePulse:
277 if ((sz->buf_in[i] & SZ_SPACE_MASK) ==
278 SZ_SPACE_MASK) {
279 sz->decoder_state = FullSpace;
280 continue;
281 }
282 sz_push_half_space(sz, sz->buf_in[i]);
283 sz->decoder_state = PulseSpace;
284 break;
285 }
286 }
287
288 ir_raw_event_handle(sz->rdev);
289 usb_submit_urb(urb, GFP_ATOMIC);
290
291 return;
292 }
293
294 static struct rc_dev *streamzap_init_rc_dev(struct streamzap_ir *sz)
295 {
296 struct rc_dev *rdev;
297 struct device *dev = sz->dev;
298 int ret;
299
300 rdev = rc_allocate_device();
301 if (!rdev) {
302 dev_err(dev, "remote dev allocation failed\n");
303 goto out;
304 }
305
306 snprintf(sz->name, sizeof(sz->name), "Streamzap PC Remote Infrared "
307 "Receiver (%04x:%04x)",
308 le16_to_cpu(sz->usbdev->descriptor.idVendor),
309 le16_to_cpu(sz->usbdev->descriptor.idProduct));
310 usb_make_path(sz->usbdev, sz->phys, sizeof(sz->phys));
311 strlcat(sz->phys, "/input0", sizeof(sz->phys));
312
313 rdev->input_name = sz->name;
314 rdev->input_phys = sz->phys;
315 usb_to_input_id(sz->usbdev, &rdev->input_id);
316 rdev->dev.parent = dev;
317 rdev->priv = sz;
318 rdev->driver_type = RC_DRIVER_IR_RAW;
319 rc_set_allowed_protocols(rdev, RC_BIT_ALL);
320 rdev->driver_name = DRIVER_NAME;
321 rdev->map_name = RC_MAP_STREAMZAP;
322
323 ret = rc_register_device(rdev);
324 if (ret < 0) {
325 dev_err(dev, "remote input device register failed\n");
326 goto out;
327 }
328
329 return rdev;
330
331 out:
332 rc_free_device(rdev);
333 return NULL;
334 }
335
336 /**
337 * streamzap_probe
338 *
339 * Called by usb-core to associated with a candidate device
340 * On any failure the return value is the ERROR
341 * On success return 0
342 */
343 static int streamzap_probe(struct usb_interface *intf,
344 const struct usb_device_id *id)
345 {
346 struct usb_device *usbdev = interface_to_usbdev(intf);
347 struct usb_host_interface *iface_host;
348 struct streamzap_ir *sz = NULL;
349 char buf[63], name[128] = "";
350 int retval = -ENOMEM;
351 int pipe, maxp;
352
353 /* Allocate space for device driver specific data */
354 sz = kzalloc(sizeof(struct streamzap_ir), GFP_KERNEL);
355 if (!sz)
356 return -ENOMEM;
357
358 sz->usbdev = usbdev;
359 sz->interface = intf;
360
361 /* Check to ensure endpoint information matches requirements */
362 iface_host = intf->cur_altsetting;
363
364 if (iface_host->desc.bNumEndpoints != 1) {
365 dev_err(&intf->dev, "%s: Unexpected desc.bNumEndpoints (%d)\n",
366 __func__, iface_host->desc.bNumEndpoints);
367 retval = -ENODEV;
368 goto free_sz;
369 }
370
371 sz->endpoint = &(iface_host->endpoint[0].desc);
372 if ((sz->endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
373 != USB_DIR_IN) {
374 dev_err(&intf->dev, "%s: endpoint doesn't match input device "
375 "02%02x\n", __func__, sz->endpoint->bEndpointAddress);
376 retval = -ENODEV;
377 goto free_sz;
378 }
379
380 if ((sz->endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
381 != USB_ENDPOINT_XFER_INT) {
382 dev_err(&intf->dev, "%s: endpoint attributes don't match xfer "
383 "02%02x\n", __func__, sz->endpoint->bmAttributes);
384 retval = -ENODEV;
385 goto free_sz;
386 }
387
388 pipe = usb_rcvintpipe(usbdev, sz->endpoint->bEndpointAddress);
389 maxp = usb_maxpacket(usbdev, pipe, usb_pipeout(pipe));
390
391 if (maxp == 0) {
392 dev_err(&intf->dev, "%s: endpoint Max Packet Size is 0!?!\n",
393 __func__);
394 retval = -ENODEV;
395 goto free_sz;
396 }
397
398 /* Allocate the USB buffer and IRQ URB */
399 sz->buf_in = usb_alloc_coherent(usbdev, maxp, GFP_ATOMIC, &sz->dma_in);
400 if (!sz->buf_in)
401 goto free_sz;
402
403 sz->urb_in = usb_alloc_urb(0, GFP_KERNEL);
404 if (!sz->urb_in)
405 goto free_buf_in;
406
407 sz->dev = &intf->dev;
408 sz->buf_in_len = maxp;
409
410 if (usbdev->descriptor.iManufacturer
411 && usb_string(usbdev, usbdev->descriptor.iManufacturer,
412 buf, sizeof(buf)) > 0)
413 strlcpy(name, buf, sizeof(name));
414
415 if (usbdev->descriptor.iProduct
416 && usb_string(usbdev, usbdev->descriptor.iProduct,
417 buf, sizeof(buf)) > 0)
418 snprintf(name + strlen(name), sizeof(name) - strlen(name),
419 " %s", buf);
420
421 sz->rdev = streamzap_init_rc_dev(sz);
422 if (!sz->rdev)
423 goto rc_dev_fail;
424
425 sz->idle = true;
426 sz->decoder_state = PulseSpace;
427 /* FIXME: don't yet have a way to set this */
428 sz->timeout_enabled = true;
429 sz->rdev->timeout = ((US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION) &
430 IR_MAX_DURATION) | 0x03000000);
431 #if 0
432 /* not yet supported, depends on patches from maxim */
433 /* see also: LIRC_GET_REC_RESOLUTION and LIRC_SET_REC_TIMEOUT */
434 sz->min_timeout = US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION);
435 sz->max_timeout = US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION);
436 #endif
437
438 do_gettimeofday(&sz->signal_start);
439
440 /* Complete final initialisations */
441 usb_fill_int_urb(sz->urb_in, usbdev, pipe, sz->buf_in,
442 maxp, (usb_complete_t)streamzap_callback,
443 sz, sz->endpoint->bInterval);
444 sz->urb_in->transfer_dma = sz->dma_in;
445 sz->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
446
447 usb_set_intfdata(intf, sz);
448
449 if (usb_submit_urb(sz->urb_in, GFP_ATOMIC))
450 dev_err(sz->dev, "urb submit failed\n");
451
452 dev_info(sz->dev, "Registered %s on usb%d:%d\n", name,
453 usbdev->bus->busnum, usbdev->devnum);
454
455 /* Load the streamzap not-quite-rc5 decoder too */
456 load_rc5_sz_decode();
457
458 return 0;
459
460 rc_dev_fail:
461 usb_free_urb(sz->urb_in);
462 free_buf_in:
463 usb_free_coherent(usbdev, maxp, sz->buf_in, sz->dma_in);
464 free_sz:
465 kfree(sz);
466
467 return retval;
468 }
469
470 /**
471 * streamzap_disconnect
472 *
473 * Called by the usb core when the device is removed from the system.
474 *
475 * This routine guarantees that the driver will not submit any more urbs
476 * by clearing dev->usbdev. It is also supposed to terminate any currently
477 * active urbs. Unfortunately, usb_bulk_msg(), used in streamzap_read(),
478 * does not provide any way to do this.
479 */
480 static void streamzap_disconnect(struct usb_interface *interface)
481 {
482 struct streamzap_ir *sz = usb_get_intfdata(interface);
483 struct usb_device *usbdev = interface_to_usbdev(interface);
484
485 usb_set_intfdata(interface, NULL);
486
487 if (!sz)
488 return;
489
490 sz->usbdev = NULL;
491 rc_unregister_device(sz->rdev);
492 usb_kill_urb(sz->urb_in);
493 usb_free_urb(sz->urb_in);
494 usb_free_coherent(usbdev, sz->buf_in_len, sz->buf_in, sz->dma_in);
495
496 kfree(sz);
497 }
498
499 static int streamzap_suspend(struct usb_interface *intf, pm_message_t message)
500 {
501 struct streamzap_ir *sz = usb_get_intfdata(intf);
502
503 usb_kill_urb(sz->urb_in);
504
505 return 0;
506 }
507
508 static int streamzap_resume(struct usb_interface *intf)
509 {
510 struct streamzap_ir *sz = usb_get_intfdata(intf);
511
512 if (usb_submit_urb(sz->urb_in, GFP_ATOMIC)) {
513 dev_err(sz->dev, "Error sumbiting urb\n");
514 return -EIO;
515 }
516
517 return 0;
518 }
519
520 module_usb_driver(streamzap_driver);
521
522 MODULE_AUTHOR("Jarod Wilson <jarod@wilsonet.com>");
523 MODULE_DESCRIPTION(DRIVER_DESC);
524 MODULE_LICENSE("GPL");
Linux with added FPC-III support