1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // em28xx-core.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
4 //
5 // Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
6 // Markus Rechberger <mrechberger@gmail.com>
7 // Mauro Carvalho Chehab <mchehab@kernel.org>
8 // Sascha Sommer <saschasommer@freenet.de>
9 // Copyright (C) 2012 Frank Schäfer <fschaefer.oss@googlemail.com>
10
11 #include "em28xx.h"
12
13 #include <linux/init.h>
14 #include <linux/jiffies.h>
15 #include <linux/list.h>
16 #include <linux/module.h>
17 #include <linux/slab.h>
18 #include <linux/usb.h>
19 #include <linux/vmalloc.h>
20 #include <sound/ac97_codec.h>
21 #include <media/v4l2-common.h>
22
23 #define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
24 "Markus Rechberger <mrechberger@gmail.com>, " \
25 "Mauro Carvalho Chehab <mchehab@kernel.org>, " \
26 "Sascha Sommer <saschasommer@freenet.de>"
27
28 MODULE_AUTHOR(DRIVER_AUTHOR);
29 MODULE_DESCRIPTION(DRIVER_DESC);
30 MODULE_LICENSE("GPL v2");
31 MODULE_VERSION(EM28XX_VERSION);
32
33 /* #define ENABLE_DEBUG_ISOC_FRAMES */
34
35 static unsigned int core_debug;
36 module_param(core_debug, int, 0644);
37 MODULE_PARM_DESC(core_debug, "enable debug messages [core and isoc]");
38
39 #define em28xx_coredbg(fmt, arg...) do { \
40 if (core_debug) \
41 dev_printk(KERN_DEBUG, &dev->intf->dev, \
42 "core: %s: " fmt, __func__, ## arg); \
43 } while (0)
44
45 static unsigned int reg_debug;
46 module_param(reg_debug, int, 0644);
47 MODULE_PARM_DESC(reg_debug, "enable debug messages [URB reg]");
48
49 #define em28xx_regdbg(fmt, arg...) do { \
50 if (reg_debug) \
51 dev_printk(KERN_DEBUG, &dev->intf->dev, \
52 "reg: %s: " fmt, __func__, ## arg); \
53 } while (0)
54
55 /* FIXME: don't abuse core_debug */
56 #define em28xx_isocdbg(fmt, arg...) do { \
57 if (core_debug) \
58 dev_printk(KERN_DEBUG, &dev->intf->dev, \
59 "core: %s: " fmt, __func__, ## arg); \
60 } while (0)
61
62 /*
63 * em28xx_read_reg_req()
64 * reads data from the usb device specifying bRequest
65 */
em28xx_read_reg_req_len(struct em28xx * dev,u8 req,u16 reg,char * buf,int len)66 int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
67 char *buf, int len)
68 {
69 int ret;
70 struct usb_device *udev = interface_to_usbdev(dev->intf);
71 int pipe = usb_rcvctrlpipe(udev, 0);
72
73 if (dev->disconnected)
74 return -ENODEV;
75
76 if (len > URB_MAX_CTRL_SIZE)
77 return -EINVAL;
78
79 mutex_lock(&dev->ctrl_urb_lock);
80 ret = usb_control_msg(udev, pipe, req,
81 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
82 0x0000, reg, dev->urb_buf, len, 1000);
83 if (ret < 0) {
84 em28xx_regdbg("(pipe 0x%08x): IN: %02x %02x %02x %02x %02x %02x %02x %02x failed with error %i\n",
85 pipe,
86 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
87 req, 0, 0,
88 reg & 0xff, reg >> 8,
89 len & 0xff, len >> 8, ret);
90 mutex_unlock(&dev->ctrl_urb_lock);
91 return usb_translate_errors(ret);
92 }
93
94 if (len)
95 memcpy(buf, dev->urb_buf, len);
96
97 mutex_unlock(&dev->ctrl_urb_lock);
98
99 em28xx_regdbg("(pipe 0x%08x): IN: %02x %02x %02x %02x %02x %02x %02x %02x <<< %*ph\n",
100 pipe, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
101 req, 0, 0,
102 reg & 0xff, reg >> 8,
103 len & 0xff, len >> 8, len, buf);
104
105 return ret;
106 }
107
108 /*
109 * em28xx_read_reg_req()
110 * reads data from the usb device specifying bRequest
111 */
em28xx_read_reg_req(struct em28xx * dev,u8 req,u16 reg)112 int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
113 {
114 int ret;
115 u8 val;
116
117 ret = em28xx_read_reg_req_len(dev, req, reg, &val, 1);
118 if (ret < 0)
119 return ret;
120
121 return val;
122 }
123
em28xx_read_reg(struct em28xx * dev,u16 reg)124 int em28xx_read_reg(struct em28xx *dev, u16 reg)
125 {
126 return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
127 }
128 EXPORT_SYMBOL_GPL(em28xx_read_reg);
129
130 /*
131 * em28xx_write_regs_req()
132 * sends data to the usb device, specifying bRequest
133 */
em28xx_write_regs_req(struct em28xx * dev,u8 req,u16 reg,char * buf,int len)134 int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
135 int len)
136 {
137 int ret;
138 struct usb_device *udev = interface_to_usbdev(dev->intf);
139 int pipe = usb_sndctrlpipe(udev, 0);
140
141 if (dev->disconnected)
142 return -ENODEV;
143
144 if (len < 1 || len > URB_MAX_CTRL_SIZE)
145 return -EINVAL;
146
147 mutex_lock(&dev->ctrl_urb_lock);
148 memcpy(dev->urb_buf, buf, len);
149 ret = usb_control_msg(udev, pipe, req,
150 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
151 0x0000, reg, dev->urb_buf, len, 1000);
152 mutex_unlock(&dev->ctrl_urb_lock);
153
154 if (ret < 0) {
155 em28xx_regdbg("(pipe 0x%08x): OUT: %02x %02x %02x %02x %02x %02x %02x %02x >>> %*ph failed with error %i\n",
156 pipe,
157 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
158 req, 0, 0,
159 reg & 0xff, reg >> 8,
160 len & 0xff, len >> 8, len, buf, ret);
161 return usb_translate_errors(ret);
162 }
163
164 em28xx_regdbg("(pipe 0x%08x): OUT: %02x %02x %02x %02x %02x %02x %02x %02x >>> %*ph\n",
165 pipe,
166 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
167 req, 0, 0,
168 reg & 0xff, reg >> 8,
169 len & 0xff, len >> 8, len, buf);
170
171 if (dev->wait_after_write)
172 msleep(dev->wait_after_write);
173
174 return ret;
175 }
176
em28xx_write_regs(struct em28xx * dev,u16 reg,char * buf,int len)177 int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
178 {
179 return em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
180 }
181 EXPORT_SYMBOL_GPL(em28xx_write_regs);
182
183 /* Write a single register */
em28xx_write_reg(struct em28xx * dev,u16 reg,u8 val)184 int em28xx_write_reg(struct em28xx *dev, u16 reg, u8 val)
185 {
186 return em28xx_write_regs(dev, reg, &val, 1);
187 }
188 EXPORT_SYMBOL_GPL(em28xx_write_reg);
189
190 /*
191 * em28xx_write_reg_bits()
192 * sets only some bits (specified by bitmask) of a register, by first reading
193 * the actual value
194 */
em28xx_write_reg_bits(struct em28xx * dev,u16 reg,u8 val,u8 bitmask)195 int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
196 u8 bitmask)
197 {
198 int oldval;
199 u8 newval;
200
201 oldval = em28xx_read_reg(dev, reg);
202 if (oldval < 0)
203 return oldval;
204
205 newval = (((u8)oldval) & ~bitmask) | (val & bitmask);
206
207 return em28xx_write_regs(dev, reg, &newval, 1);
208 }
209 EXPORT_SYMBOL_GPL(em28xx_write_reg_bits);
210
211 /*
212 * em28xx_toggle_reg_bits()
213 * toggles/inverts the bits (specified by bitmask) of a register
214 */
em28xx_toggle_reg_bits(struct em28xx * dev,u16 reg,u8 bitmask)215 int em28xx_toggle_reg_bits(struct em28xx *dev, u16 reg, u8 bitmask)
216 {
217 int oldval;
218 u8 newval;
219
220 oldval = em28xx_read_reg(dev, reg);
221 if (oldval < 0)
222 return oldval;
223
224 newval = (~oldval & bitmask) | (oldval & ~bitmask);
225
226 return em28xx_write_reg(dev, reg, newval);
227 }
228 EXPORT_SYMBOL_GPL(em28xx_toggle_reg_bits);
229
230 /*
231 * em28xx_is_ac97_ready()
232 * Checks if ac97 is ready
233 */
em28xx_is_ac97_ready(struct em28xx * dev)234 static int em28xx_is_ac97_ready(struct em28xx *dev)
235 {
236 unsigned long timeout = jiffies + msecs_to_jiffies(EM28XX_AC97_XFER_TIMEOUT);
237 int ret;
238
239 /* Wait up to 50 ms for AC97 command to complete */
240 while (time_is_after_jiffies(timeout)) {
241 ret = em28xx_read_reg(dev, EM28XX_R43_AC97BUSY);
242 if (ret < 0)
243 return ret;
244
245 if (!(ret & 0x01))
246 return 0;
247 msleep(5);
248 }
249
250 dev_warn(&dev->intf->dev,
251 "AC97 command still being executed: not handled properly!\n");
252 return -EBUSY;
253 }
254
255 /*
256 * em28xx_read_ac97()
257 * write a 16 bit value to the specified AC97 address (LSB first!)
258 */
em28xx_read_ac97(struct em28xx * dev,u8 reg)259 int em28xx_read_ac97(struct em28xx *dev, u8 reg)
260 {
261 int ret;
262 u8 addr = (reg & 0x7f) | 0x80;
263 __le16 val;
264
265 ret = em28xx_is_ac97_ready(dev);
266 if (ret < 0)
267 return ret;
268
269 ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
270 if (ret < 0)
271 return ret;
272
273 ret = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R40_AC97LSB,
274 (u8 *)&val, sizeof(val));
275
276 if (ret < 0)
277 return ret;
278 return le16_to_cpu(val);
279 }
280 EXPORT_SYMBOL_GPL(em28xx_read_ac97);
281
282 /*
283 * em28xx_write_ac97()
284 * write a 16 bit value to the specified AC97 address (LSB first!)
285 */
em28xx_write_ac97(struct em28xx * dev,u8 reg,u16 val)286 int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val)
287 {
288 int ret;
289 u8 addr = reg & 0x7f;
290 __le16 value;
291
292 value = cpu_to_le16(val);
293
294 ret = em28xx_is_ac97_ready(dev);
295 if (ret < 0)
296 return ret;
297
298 ret = em28xx_write_regs(dev, EM28XX_R40_AC97LSB, (u8 *)&value, 2);
299 if (ret < 0)
300 return ret;
301
302 ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
303 if (ret < 0)
304 return ret;
305
306 return 0;
307 }
308 EXPORT_SYMBOL_GPL(em28xx_write_ac97);
309
310 struct em28xx_vol_itable {
311 enum em28xx_amux mux;
312 u8 reg;
313 };
314
315 static struct em28xx_vol_itable inputs[] = {
316 { EM28XX_AMUX_VIDEO, AC97_VIDEO },
317 { EM28XX_AMUX_LINE_IN, AC97_LINE },
318 { EM28XX_AMUX_PHONE, AC97_PHONE },
319 { EM28XX_AMUX_MIC, AC97_MIC },
320 { EM28XX_AMUX_CD, AC97_CD },
321 { EM28XX_AMUX_AUX, AC97_AUX },
322 { EM28XX_AMUX_PCM_OUT, AC97_PCM },
323 };
324
set_ac97_input(struct em28xx * dev)325 static int set_ac97_input(struct em28xx *dev)
326 {
327 int ret, i;
328 enum em28xx_amux amux = dev->ctl_ainput;
329
330 /*
331 * EM28XX_AMUX_VIDEO2 is a special case used to indicate that
332 * em28xx should point to LINE IN, while AC97 should use VIDEO
333 */
334 if (amux == EM28XX_AMUX_VIDEO2)
335 amux = EM28XX_AMUX_VIDEO;
336
337 /* Mute all entres but the one that were selected */
338 for (i = 0; i < ARRAY_SIZE(inputs); i++) {
339 if (amux == inputs[i].mux)
340 ret = em28xx_write_ac97(dev, inputs[i].reg, 0x0808);
341 else
342 ret = em28xx_write_ac97(dev, inputs[i].reg, 0x8000);
343
344 if (ret < 0)
345 dev_warn(&dev->intf->dev,
346 "couldn't setup AC97 register %d\n",
347 inputs[i].reg);
348 }
349 return 0;
350 }
351
em28xx_set_audio_source(struct em28xx * dev)352 static int em28xx_set_audio_source(struct em28xx *dev)
353 {
354 int ret;
355 u8 input;
356
357 if (dev->board.is_em2800) {
358 if (dev->ctl_ainput == EM28XX_AMUX_VIDEO)
359 input = EM2800_AUDIO_SRC_TUNER;
360 else
361 input = EM2800_AUDIO_SRC_LINE;
362
363 ret = em28xx_write_regs(dev, EM2800_R08_AUDIOSRC, &input, 1);
364 if (ret < 0)
365 return ret;
366 }
367
368 if (dev->has_msp34xx) {
369 input = EM28XX_AUDIO_SRC_TUNER;
370 } else {
371 switch (dev->ctl_ainput) {
372 case EM28XX_AMUX_VIDEO:
373 input = EM28XX_AUDIO_SRC_TUNER;
374 break;
375 default:
376 input = EM28XX_AUDIO_SRC_LINE;
377 break;
378 }
379 }
380
381 if (dev->board.mute_gpio && dev->mute)
382 em28xx_gpio_set(dev, dev->board.mute_gpio);
383 else
384 em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
385
386 ret = em28xx_write_reg_bits(dev, EM28XX_R0E_AUDIOSRC, input, 0xc0);
387 if (ret < 0)
388 return ret;
389 usleep_range(10000, 11000);
390
391 switch (dev->audio_mode.ac97) {
392 case EM28XX_NO_AC97:
393 break;
394 default:
395 ret = set_ac97_input(dev);
396 }
397
398 return ret;
399 }
400
401 struct em28xx_vol_otable {
402 enum em28xx_aout mux;
403 u8 reg;
404 };
405
406 static const struct em28xx_vol_otable outputs[] = {
407 { EM28XX_AOUT_MASTER, AC97_MASTER },
408 { EM28XX_AOUT_LINE, AC97_HEADPHONE },
409 { EM28XX_AOUT_MONO, AC97_MASTER_MONO },
410 { EM28XX_AOUT_LFE, AC97_CENTER_LFE_MASTER },
411 { EM28XX_AOUT_SURR, AC97_SURROUND_MASTER },
412 };
413
em28xx_audio_analog_set(struct em28xx * dev)414 int em28xx_audio_analog_set(struct em28xx *dev)
415 {
416 int ret, i;
417 u8 xclk;
418
419 if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE)
420 return 0;
421
422 /*
423 * It is assumed that all devices use master volume for output.
424 * It would be possible to use also line output.
425 */
426 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
427 /* Mute all outputs */
428 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
429 ret = em28xx_write_ac97(dev, outputs[i].reg, 0x8000);
430 if (ret < 0)
431 dev_warn(&dev->intf->dev,
432 "couldn't setup AC97 register %d\n",
433 outputs[i].reg);
434 }
435 }
436
437 xclk = dev->board.xclk & 0x7f;
438 if (!dev->mute)
439 xclk |= EM28XX_XCLK_AUDIO_UNMUTE;
440
441 ret = em28xx_write_reg(dev, EM28XX_R0F_XCLK, xclk);
442 if (ret < 0)
443 return ret;
444 usleep_range(10000, 11000);
445
446 /* Selects the proper audio input */
447 ret = em28xx_set_audio_source(dev);
448
449 /* Sets volume */
450 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
451 int vol;
452
453 em28xx_write_ac97(dev, AC97_POWERDOWN, 0x4200);
454 em28xx_write_ac97(dev, AC97_EXTENDED_STATUS, 0x0031);
455 em28xx_write_ac97(dev, AC97_PCM_LR_ADC_RATE, 0xbb80);
456
457 /* LSB: left channel - both channels with the same level */
458 vol = (0x1f - dev->volume) | ((0x1f - dev->volume) << 8);
459
460 /* Mute device, if needed */
461 if (dev->mute)
462 vol |= 0x8000;
463
464 /* Sets volume */
465 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
466 if (dev->ctl_aoutput & outputs[i].mux)
467 ret = em28xx_write_ac97(dev, outputs[i].reg,
468 vol);
469 if (ret < 0)
470 dev_warn(&dev->intf->dev,
471 "couldn't setup AC97 register %d\n",
472 outputs[i].reg);
473 }
474
475 if (dev->ctl_aoutput & EM28XX_AOUT_PCM_IN) {
476 int sel = ac97_return_record_select(dev->ctl_aoutput);
477
478 /*
479 * Use the same input for both left and right
480 * channels
481 */
482 sel |= (sel << 8);
483
484 em28xx_write_ac97(dev, AC97_REC_SEL, sel);
485 }
486 }
487
488 return ret;
489 }
490 EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
491
em28xx_audio_setup(struct em28xx * dev)492 int em28xx_audio_setup(struct em28xx *dev)
493 {
494 int vid1, vid2, feat, cfg;
495 u32 vid = 0;
496 u8 i2s_samplerates;
497
498 if (dev->chip_id == CHIP_ID_EM2870 ||
499 dev->chip_id == CHIP_ID_EM2874 ||
500 dev->chip_id == CHIP_ID_EM28174 ||
501 dev->chip_id == CHIP_ID_EM28178) {
502 /* Digital only device - don't load any alsa module */
503 dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
504 dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
505 return 0;
506 }
507
508 /* See how this device is configured */
509 cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
510 dev_info(&dev->intf->dev, "Config register raw data: 0x%02x\n", cfg);
511 if (cfg < 0) { /* Register read error */
512 /* Be conservative */
513 dev->int_audio_type = EM28XX_INT_AUDIO_AC97;
514 } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) == 0x00) {
515 /* The device doesn't have vendor audio at all */
516 dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
517 dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
518 return 0;
519 } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) != EM28XX_CHIPCFG_AC97) {
520 dev->int_audio_type = EM28XX_INT_AUDIO_I2S;
521 if (dev->chip_id < CHIP_ID_EM2860 &&
522 (cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
523 EM2820_CHIPCFG_I2S_1_SAMPRATE)
524 i2s_samplerates = 1;
525 else if (dev->chip_id >= CHIP_ID_EM2860 &&
526 (cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
527 EM2860_CHIPCFG_I2S_5_SAMPRATES)
528 i2s_samplerates = 5;
529 else
530 i2s_samplerates = 3;
531 dev_info(&dev->intf->dev, "I2S Audio (%d sample rate(s))\n",
532 i2s_samplerates);
533 /* Skip the code that does AC97 vendor detection */
534 dev->audio_mode.ac97 = EM28XX_NO_AC97;
535 goto init_audio;
536 } else {
537 dev->int_audio_type = EM28XX_INT_AUDIO_AC97;
538 }
539
540 dev->audio_mode.ac97 = EM28XX_AC97_OTHER;
541
542 vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1);
543 if (vid1 < 0) {
544 /*
545 * Device likely doesn't support AC97
546 * Note: (some) em2800 devices without eeprom reports 0x91 on
547 * CHIPCFG register, even not having an AC97 chip
548 */
549 dev_warn(&dev->intf->dev,
550 "AC97 chip type couldn't be determined\n");
551 dev->audio_mode.ac97 = EM28XX_NO_AC97;
552 if (dev->usb_audio_type == EM28XX_USB_AUDIO_VENDOR)
553 dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
554 dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
555 goto init_audio;
556 }
557
558 vid2 = em28xx_read_ac97(dev, AC97_VENDOR_ID2);
559 if (vid2 < 0)
560 goto init_audio;
561
562 vid = vid1 << 16 | vid2;
563 dev_warn(&dev->intf->dev, "AC97 vendor ID = 0x%08x\n", vid);
564
565 feat = em28xx_read_ac97(dev, AC97_RESET);
566 if (feat < 0)
567 goto init_audio;
568
569 dev_warn(&dev->intf->dev, "AC97 features = 0x%04x\n", feat);
570
571 /* Try to identify what audio processor we have */
572 if ((vid == 0xffffffff || vid == 0x83847650) && feat == 0x6a90)
573 dev->audio_mode.ac97 = EM28XX_AC97_EM202;
574 else if ((vid >> 8) == 0x838476)
575 dev->audio_mode.ac97 = EM28XX_AC97_SIGMATEL;
576
577 init_audio:
578 /* Reports detected AC97 processor */
579 switch (dev->audio_mode.ac97) {
580 case EM28XX_NO_AC97:
581 dev_info(&dev->intf->dev, "No AC97 audio processor\n");
582 break;
583 case EM28XX_AC97_EM202:
584 dev_info(&dev->intf->dev,
585 "Empia 202 AC97 audio processor detected\n");
586 break;
587 case EM28XX_AC97_SIGMATEL:
588 dev_info(&dev->intf->dev,
589 "Sigmatel audio processor detected (stac 97%02x)\n",
590 vid & 0xff);
591 break;
592 case EM28XX_AC97_OTHER:
593 dev_warn(&dev->intf->dev,
594 "Unknown AC97 audio processor detected!\n");
595 break;
596 default:
597 break;
598 }
599
600 return em28xx_audio_analog_set(dev);
601 }
602 EXPORT_SYMBOL_GPL(em28xx_audio_setup);
603
em28xx_find_led(struct em28xx * dev,enum em28xx_led_role role)604 const struct em28xx_led *em28xx_find_led(struct em28xx *dev,
605 enum em28xx_led_role role)
606 {
607 if (dev->board.leds) {
608 u8 k = 0;
609
610 while (dev->board.leds[k].role >= 0 &&
611 dev->board.leds[k].role < EM28XX_NUM_LED_ROLES) {
612 if (dev->board.leds[k].role == role)
613 return &dev->board.leds[k];
614 k++;
615 }
616 }
617 return NULL;
618 }
619 EXPORT_SYMBOL_GPL(em28xx_find_led);
620
em28xx_capture_start(struct em28xx * dev,int start)621 int em28xx_capture_start(struct em28xx *dev, int start)
622 {
623 int rc;
624 const struct em28xx_led *led = NULL;
625
626 if (dev->chip_id == CHIP_ID_EM2874 ||
627 dev->chip_id == CHIP_ID_EM2884 ||
628 dev->chip_id == CHIP_ID_EM28174 ||
629 dev->chip_id == CHIP_ID_EM28178) {
630 /* The Transport Stream Enable Register moved in em2874 */
631 if (dev->dvb_xfer_bulk) {
632 /* Max Tx Size = 188 * 256 = 48128 - LCM(188,512) * 2 */
633 em28xx_write_reg(dev, (dev->ts == PRIMARY_TS) ?
634 EM2874_R5D_TS1_PKT_SIZE :
635 EM2874_R5E_TS2_PKT_SIZE,
636 0xff);
637 } else {
638 /* ISOC Maximum Transfer Size = 188 * 5 */
639 em28xx_write_reg(dev, (dev->ts == PRIMARY_TS) ?
640 EM2874_R5D_TS1_PKT_SIZE :
641 EM2874_R5E_TS2_PKT_SIZE,
642 dev->dvb_max_pkt_size_isoc / 188);
643 }
644 if (dev->ts == PRIMARY_TS)
645 rc = em28xx_write_reg_bits(dev,
646 EM2874_R5F_TS_ENABLE,
647 start ? EM2874_TS1_CAPTURE_ENABLE : 0x00,
648 EM2874_TS1_CAPTURE_ENABLE | EM2874_TS1_FILTER_ENABLE | EM2874_TS1_NULL_DISCARD);
649 else
650 rc = em28xx_write_reg_bits(dev,
651 EM2874_R5F_TS_ENABLE,
652 start ? EM2874_TS2_CAPTURE_ENABLE : 0x00,
653 EM2874_TS2_CAPTURE_ENABLE | EM2874_TS2_FILTER_ENABLE | EM2874_TS2_NULL_DISCARD);
654 } else {
655 /* FIXME: which is the best order? */
656 /* video registers are sampled by VREF */
657 rc = em28xx_write_reg_bits(dev, EM28XX_R0C_USBSUSP,
658 start ? 0x10 : 0x00, 0x10);
659 if (rc < 0)
660 return rc;
661
662 if (start) {
663 if (dev->is_webcam)
664 rc = em28xx_write_reg(dev, 0x13, 0x0c);
665
666 /* Enable video capture */
667 rc = em28xx_write_reg(dev, 0x48, 0x00);
668 if (rc < 0)
669 return rc;
670
671 if (dev->mode == EM28XX_ANALOG_MODE)
672 rc = em28xx_write_reg(dev,
673 EM28XX_R12_VINENABLE,
674 0x67);
675 else
676 rc = em28xx_write_reg(dev,
677 EM28XX_R12_VINENABLE,
678 0x37);
679 if (rc < 0)
680 return rc;
681
682 usleep_range(10000, 11000);
683 } else {
684 /* disable video capture */
685 rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x27);
686 }
687 }
688
689 if (dev->mode == EM28XX_ANALOG_MODE)
690 led = em28xx_find_led(dev, EM28XX_LED_ANALOG_CAPTURING);
691 else if (dev->ts == PRIMARY_TS)
692 led = em28xx_find_led(dev, EM28XX_LED_DIGITAL_CAPTURING);
693 else
694 led = em28xx_find_led(dev, EM28XX_LED_DIGITAL_CAPTURING_TS2);
695
696 if (led)
697 em28xx_write_reg_bits(dev, led->gpio_reg,
698 (!start ^ led->inverted) ?
699 ~led->gpio_mask : led->gpio_mask,
700 led->gpio_mask);
701
702 return rc;
703 }
704
em28xx_gpio_set(struct em28xx * dev,const struct em28xx_reg_seq * gpio)705 int em28xx_gpio_set(struct em28xx *dev, const struct em28xx_reg_seq *gpio)
706 {
707 int rc = 0;
708
709 if (!gpio)
710 return rc;
711
712 if (dev->mode != EM28XX_SUSPEND) {
713 em28xx_write_reg(dev, 0x48, 0x00);
714 if (dev->mode == EM28XX_ANALOG_MODE)
715 em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
716 else
717 em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
718 usleep_range(10000, 11000);
719 }
720
721 /* Send GPIO reset sequences specified at board entry */
722 while (gpio->sleep >= 0) {
723 if (gpio->reg >= 0) {
724 rc = em28xx_write_reg_bits(dev,
725 gpio->reg,
726 gpio->val,
727 gpio->mask);
728 if (rc < 0)
729 return rc;
730 }
731 if (gpio->sleep > 0)
732 msleep(gpio->sleep);
733
734 gpio++;
735 }
736 return rc;
737 }
738 EXPORT_SYMBOL_GPL(em28xx_gpio_set);
739
em28xx_set_mode(struct em28xx * dev,enum em28xx_mode set_mode)740 int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode)
741 {
742 if (dev->mode == set_mode)
743 return 0;
744
745 if (set_mode == EM28XX_SUSPEND) {
746 dev->mode = set_mode;
747
748 /* FIXME: add suspend support for ac97 */
749
750 return em28xx_gpio_set(dev, dev->board.suspend_gpio);
751 }
752
753 dev->mode = set_mode;
754
755 if (dev->mode == EM28XX_DIGITAL_MODE)
756 return em28xx_gpio_set(dev, dev->board.dvb_gpio);
757 else
758 return em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
759 }
760 EXPORT_SYMBOL_GPL(em28xx_set_mode);
761
762 /*
763 *URB control
764 */
765
766 /*
767 * URB completion handler for isoc/bulk transfers
768 */
em28xx_irq_callback(struct urb * urb)769 static void em28xx_irq_callback(struct urb *urb)
770 {
771 struct em28xx *dev = urb->context;
772 unsigned long flags;
773 int i;
774
775 switch (urb->status) {
776 case 0: /* success */
777 case -ETIMEDOUT: /* NAK */
778 break;
779 case -ECONNRESET: /* kill */
780 case -ENOENT:
781 case -ESHUTDOWN:
782 return;
783 default: /* error */
784 em28xx_isocdbg("urb completion error %d.\n", urb->status);
785 break;
786 }
787
788 /* Copy data from URB */
789 spin_lock_irqsave(&dev->slock, flags);
790 dev->usb_ctl.urb_data_copy(dev, urb);
791 spin_unlock_irqrestore(&dev->slock, flags);
792
793 /* Reset urb buffers */
794 for (i = 0; i < urb->number_of_packets; i++) {
795 /* isoc only (bulk: number_of_packets = 0) */
796 urb->iso_frame_desc[i].status = 0;
797 urb->iso_frame_desc[i].actual_length = 0;
798 }
799 urb->status = 0;
800
801 urb->status = usb_submit_urb(urb, GFP_ATOMIC);
802 if (urb->status) {
803 em28xx_isocdbg("urb resubmit failed (error=%i)\n",
804 urb->status);
805 }
806 }
807
808 /*
809 * Stop and Deallocate URBs
810 */
em28xx_uninit_usb_xfer(struct em28xx * dev,enum em28xx_mode mode)811 void em28xx_uninit_usb_xfer(struct em28xx *dev, enum em28xx_mode mode)
812 {
813 struct urb *urb;
814 struct em28xx_usb_bufs *usb_bufs;
815 int i;
816
817 em28xx_isocdbg("called %s in mode %d\n", __func__, mode);
818
819 if (mode == EM28XX_DIGITAL_MODE)
820 usb_bufs = &dev->usb_ctl.digital_bufs;
821 else
822 usb_bufs = &dev->usb_ctl.analog_bufs;
823
824 for (i = 0; i < usb_bufs->num_bufs; i++) {
825 urb = usb_bufs->urb[i];
826 if (urb) {
827 if (!irqs_disabled())
828 usb_kill_urb(urb);
829 else
830 usb_unlink_urb(urb);
831
832 usb_free_urb(urb);
833 usb_bufs->urb[i] = NULL;
834 }
835 }
836
837 kfree(usb_bufs->urb);
838 kfree(usb_bufs->buf);
839
840 usb_bufs->urb = NULL;
841 usb_bufs->buf = NULL;
842 usb_bufs->num_bufs = 0;
843
844 em28xx_capture_start(dev, 0);
845 }
846 EXPORT_SYMBOL_GPL(em28xx_uninit_usb_xfer);
847
848 /*
849 * Stop URBs
850 */
em28xx_stop_urbs(struct em28xx * dev)851 void em28xx_stop_urbs(struct em28xx *dev)
852 {
853 int i;
854 struct urb *urb;
855 struct em28xx_usb_bufs *isoc_bufs = &dev->usb_ctl.digital_bufs;
856
857 em28xx_isocdbg("called %s\n", __func__);
858
859 for (i = 0; i < isoc_bufs->num_bufs; i++) {
860 urb = isoc_bufs->urb[i];
861 if (urb) {
862 if (!irqs_disabled())
863 usb_kill_urb(urb);
864 else
865 usb_unlink_urb(urb);
866 }
867 }
868
869 em28xx_capture_start(dev, 0);
870 }
871 EXPORT_SYMBOL_GPL(em28xx_stop_urbs);
872
873 /*
874 * Allocate URBs
875 */
em28xx_alloc_urbs(struct em28xx * dev,enum em28xx_mode mode,int xfer_bulk,int num_bufs,int max_pkt_size,int packet_multiplier)876 int em28xx_alloc_urbs(struct em28xx *dev, enum em28xx_mode mode, int xfer_bulk,
877 int num_bufs, int max_pkt_size, int packet_multiplier)
878 {
879 struct em28xx_usb_bufs *usb_bufs;
880 struct urb *urb;
881 struct usb_device *udev = interface_to_usbdev(dev->intf);
882 int i;
883 int sb_size, pipe;
884 int j, k;
885
886 em28xx_isocdbg("em28xx: called %s in mode %d\n", __func__, mode);
887
888 /*
889 * Check mode and if we have an endpoint for the selected
890 * transfer type, select buffer
891 */
892 if (mode == EM28XX_DIGITAL_MODE) {
893 if ((xfer_bulk && !dev->dvb_ep_bulk) ||
894 (!xfer_bulk && !dev->dvb_ep_isoc)) {
895 dev_err(&dev->intf->dev,
896 "no endpoint for DVB mode and transfer type %d\n",
897 xfer_bulk > 0);
898 return -EINVAL;
899 }
900 usb_bufs = &dev->usb_ctl.digital_bufs;
901 } else if (mode == EM28XX_ANALOG_MODE) {
902 if ((xfer_bulk && !dev->analog_ep_bulk) ||
903 (!xfer_bulk && !dev->analog_ep_isoc)) {
904 dev_err(&dev->intf->dev,
905 "no endpoint for analog mode and transfer type %d\n",
906 xfer_bulk > 0);
907 return -EINVAL;
908 }
909 usb_bufs = &dev->usb_ctl.analog_bufs;
910 } else {
911 dev_err(&dev->intf->dev, "invalid mode selected\n");
912 return -EINVAL;
913 }
914
915 /* De-allocates all pending stuff */
916 em28xx_uninit_usb_xfer(dev, mode);
917
918 usb_bufs->num_bufs = num_bufs;
919
920 usb_bufs->urb = kcalloc(num_bufs, sizeof(void *), GFP_KERNEL);
921 if (!usb_bufs->urb)
922 return -ENOMEM;
923
924 usb_bufs->buf = kcalloc(num_bufs, sizeof(void *), GFP_KERNEL);
925 if (!usb_bufs->buf) {
926 kfree(usb_bufs->urb);
927 return -ENOMEM;
928 }
929
930 usb_bufs->max_pkt_size = max_pkt_size;
931 if (xfer_bulk)
932 usb_bufs->num_packets = 0;
933 else
934 usb_bufs->num_packets = packet_multiplier;
935 dev->usb_ctl.vid_buf = NULL;
936 dev->usb_ctl.vbi_buf = NULL;
937
938 sb_size = packet_multiplier * usb_bufs->max_pkt_size;
939
940 /* allocate urbs and transfer buffers */
941 for (i = 0; i < usb_bufs->num_bufs; i++) {
942 urb = usb_alloc_urb(usb_bufs->num_packets, GFP_KERNEL);
943 if (!urb) {
944 em28xx_uninit_usb_xfer(dev, mode);
945 return -ENOMEM;
946 }
947 usb_bufs->urb[i] = urb;
948
949 usb_bufs->buf[i] = kzalloc(sb_size, GFP_KERNEL);
950 if (!usb_bufs->buf[i]) {
951 for (i--; i >= 0; i--)
952 kfree(usb_bufs->buf[i]);
953
954 em28xx_uninit_usb_xfer(dev, mode);
955 return -ENOMEM;
956 }
957
958 urb->transfer_flags = URB_FREE_BUFFER;
959
960 if (xfer_bulk) { /* bulk */
961 pipe = usb_rcvbulkpipe(udev,
962 mode == EM28XX_ANALOG_MODE ?
963 dev->analog_ep_bulk :
964 dev->dvb_ep_bulk);
965 usb_fill_bulk_urb(urb, udev, pipe, usb_bufs->buf[i],
966 sb_size, em28xx_irq_callback, dev);
967 } else { /* isoc */
968 pipe = usb_rcvisocpipe(udev,
969 mode == EM28XX_ANALOG_MODE ?
970 dev->analog_ep_isoc :
971 dev->dvb_ep_isoc);
972 usb_fill_int_urb(urb, udev, pipe, usb_bufs->buf[i],
973 sb_size, em28xx_irq_callback, dev, 1);
974 urb->transfer_flags |= URB_ISO_ASAP;
975 k = 0;
976 for (j = 0; j < usb_bufs->num_packets; j++) {
977 urb->iso_frame_desc[j].offset = k;
978 urb->iso_frame_desc[j].length =
979 usb_bufs->max_pkt_size;
980 k += usb_bufs->max_pkt_size;
981 }
982 }
983
984 urb->number_of_packets = usb_bufs->num_packets;
985 }
986
987 return 0;
988 }
989 EXPORT_SYMBOL_GPL(em28xx_alloc_urbs);
990
991 /*
992 * Allocate URBs and start IRQ
993 */
em28xx_init_usb_xfer(struct em28xx * dev,enum em28xx_mode mode,int xfer_bulk,int num_bufs,int max_pkt_size,int packet_multiplier,int (* urb_data_copy)(struct em28xx * dev,struct urb * urb))994 int em28xx_init_usb_xfer(struct em28xx *dev, enum em28xx_mode mode,
995 int xfer_bulk, int num_bufs, int max_pkt_size,
996 int packet_multiplier,
997 int (*urb_data_copy)(struct em28xx *dev, struct urb *urb))
998 {
999 struct em28xx_dmaqueue *dma_q = &dev->vidq;
1000 struct em28xx_dmaqueue *vbi_dma_q = &dev->vbiq;
1001 struct em28xx_usb_bufs *usb_bufs;
1002 struct usb_device *udev = interface_to_usbdev(dev->intf);
1003 int i;
1004 int rc;
1005 int alloc;
1006
1007 em28xx_isocdbg("em28xx: called %s in mode %d\n", __func__, mode);
1008
1009 dev->usb_ctl.urb_data_copy = urb_data_copy;
1010
1011 if (mode == EM28XX_DIGITAL_MODE) {
1012 usb_bufs = &dev->usb_ctl.digital_bufs;
1013 /* no need to free/alloc usb buffers in digital mode */
1014 alloc = 0;
1015 } else {
1016 usb_bufs = &dev->usb_ctl.analog_bufs;
1017 alloc = 1;
1018 }
1019
1020 if (alloc) {
1021 rc = em28xx_alloc_urbs(dev, mode, xfer_bulk, num_bufs,
1022 max_pkt_size, packet_multiplier);
1023 if (rc)
1024 return rc;
1025 }
1026
1027 if (xfer_bulk) {
1028 rc = usb_clear_halt(udev, usb_bufs->urb[0]->pipe);
1029 if (rc < 0) {
1030 dev_err(&dev->intf->dev,
1031 "failed to clear USB bulk endpoint stall/halt condition (error=%i)\n",
1032 rc);
1033 em28xx_uninit_usb_xfer(dev, mode);
1034 return rc;
1035 }
1036 }
1037
1038 init_waitqueue_head(&dma_q->wq);
1039 init_waitqueue_head(&vbi_dma_q->wq);
1040
1041 em28xx_capture_start(dev, 1);
1042
1043 /* submit urbs and enables IRQ */
1044 for (i = 0; i < usb_bufs->num_bufs; i++) {
1045 rc = usb_submit_urb(usb_bufs->urb[i], GFP_KERNEL);
1046 if (rc) {
1047 dev_err(&dev->intf->dev,
1048 "submit of urb %i failed (error=%i)\n", i, rc);
1049 em28xx_uninit_usb_xfer(dev, mode);
1050 return rc;
1051 }
1052 }
1053
1054 return 0;
1055 }
1056 EXPORT_SYMBOL_GPL(em28xx_init_usb_xfer);
1057
1058 /*
1059 * Device control list
1060 */
1061
1062 static LIST_HEAD(em28xx_devlist);
1063 static DEFINE_MUTEX(em28xx_devlist_mutex);
1064
1065 /*
1066 * Extension interface
1067 */
1068
1069 static LIST_HEAD(em28xx_extension_devlist);
1070
em28xx_register_extension(struct em28xx_ops * ops)1071 int em28xx_register_extension(struct em28xx_ops *ops)
1072 {
1073 struct em28xx *dev = NULL;
1074
1075 mutex_lock(&em28xx_devlist_mutex);
1076 list_add_tail(&ops->next, &em28xx_extension_devlist);
1077 list_for_each_entry(dev, &em28xx_devlist, devlist) {
1078 if (ops->init) {
1079 ops->init(dev);
1080 if (dev->dev_next)
1081 ops->init(dev->dev_next);
1082 }
1083 }
1084 mutex_unlock(&em28xx_devlist_mutex);
1085 pr_info("em28xx: Registered (%s) extension\n", ops->name);
1086 return 0;
1087 }
1088 EXPORT_SYMBOL(em28xx_register_extension);
1089
em28xx_unregister_extension(struct em28xx_ops * ops)1090 void em28xx_unregister_extension(struct em28xx_ops *ops)
1091 {
1092 struct em28xx *dev = NULL;
1093
1094 mutex_lock(&em28xx_devlist_mutex);
1095 list_for_each_entry(dev, &em28xx_devlist, devlist) {
1096 if (ops->fini) {
1097 if (dev->dev_next)
1098 ops->fini(dev->dev_next);
1099 ops->fini(dev);
1100 }
1101 }
1102 list_del(&ops->next);
1103 mutex_unlock(&em28xx_devlist_mutex);
1104 pr_info("em28xx: Removed (%s) extension\n", ops->name);
1105 }
1106 EXPORT_SYMBOL(em28xx_unregister_extension);
1107
em28xx_init_extension(struct em28xx * dev)1108 void em28xx_init_extension(struct em28xx *dev)
1109 {
1110 const struct em28xx_ops *ops = NULL;
1111
1112 mutex_lock(&em28xx_devlist_mutex);
1113 list_add_tail(&dev->devlist, &em28xx_devlist);
1114 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1115 if (ops->init) {
1116 ops->init(dev);
1117 if (dev->dev_next)
1118 ops->init(dev->dev_next);
1119 }
1120 }
1121 mutex_unlock(&em28xx_devlist_mutex);
1122 }
1123
em28xx_close_extension(struct em28xx * dev)1124 void em28xx_close_extension(struct em28xx *dev)
1125 {
1126 const struct em28xx_ops *ops = NULL;
1127
1128 mutex_lock(&em28xx_devlist_mutex);
1129 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1130 if (ops->fini) {
1131 if (dev->dev_next)
1132 ops->fini(dev->dev_next);
1133 ops->fini(dev);
1134 }
1135 }
1136 list_del(&dev->devlist);
1137 mutex_unlock(&em28xx_devlist_mutex);
1138 }
1139
em28xx_suspend_extension(struct em28xx * dev)1140 int em28xx_suspend_extension(struct em28xx *dev)
1141 {
1142 const struct em28xx_ops *ops = NULL;
1143
1144 dev_info(&dev->intf->dev, "Suspending extensions\n");
1145 mutex_lock(&em28xx_devlist_mutex);
1146 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1147 if (!ops->suspend)
1148 continue;
1149 ops->suspend(dev);
1150 if (dev->dev_next)
1151 ops->suspend(dev->dev_next);
1152 }
1153 mutex_unlock(&em28xx_devlist_mutex);
1154 return 0;
1155 }
1156
em28xx_resume_extension(struct em28xx * dev)1157 int em28xx_resume_extension(struct em28xx *dev)
1158 {
1159 const struct em28xx_ops *ops = NULL;
1160
1161 dev_info(&dev->intf->dev, "Resuming extensions\n");
1162 mutex_lock(&em28xx_devlist_mutex);
1163 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1164 if (!ops->resume)
1165 continue;
1166 ops->resume(dev);
1167 if (dev->dev_next)
1168 ops->resume(dev->dev_next);
1169 }
1170 mutex_unlock(&em28xx_devlist_mutex);
1171 return 0;
1172 }
1173