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