1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Driver for the Auvitek USB bridge
4  *
5  *  Copyright (c) 2008 Steven Toth <stoth@linuxtv.org>
6  */
7 
8 #include "au0828.h"
9 #include "au8522.h"
10 
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/videodev2.h>
14 #include <media/v4l2-common.h>
15 #include <linux/mutex.h>
16 
17 /* Due to enum tuner_pad_index */
18 #include <media/tuner.h>
19 
20 /*
21  * 1 = General debug messages
22  * 2 = USB handling
23  * 4 = I2C related
24  * 8 = Bridge related
25  * 16 = IR related
26  */
27 int au0828_debug;
28 module_param_named(debug, au0828_debug, int, 0644);
29 MODULE_PARM_DESC(debug,
30 		 "set debug bitmask: 1=general, 2=USB, 4=I2C, 8=bridge, 16=IR");
31 
32 static unsigned int disable_usb_speed_check;
33 module_param(disable_usb_speed_check, int, 0444);
34 MODULE_PARM_DESC(disable_usb_speed_check,
35 		 "override min bandwidth requirement of 480M bps");
36 
37 #define _AU0828_BULKPIPE 0x03
38 #define _BULKPIPESIZE 0xffff
39 
40 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
41 			    u16 index);
42 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
43 	u16 index, unsigned char *cp, u16 size);
44 
45 /* USB Direction */
46 #define CMD_REQUEST_IN		0x00
47 #define CMD_REQUEST_OUT		0x01
48 
au0828_readreg(struct au0828_dev * dev,u16 reg)49 u32 au0828_readreg(struct au0828_dev *dev, u16 reg)
50 {
51 	u8 result = 0;
52 
53 	recv_control_msg(dev, CMD_REQUEST_IN, 0, reg, &result, 1);
54 	dprintk(8, "%s(0x%04x) = 0x%02x\n", __func__, reg, result);
55 
56 	return result;
57 }
58 
au0828_writereg(struct au0828_dev * dev,u16 reg,u32 val)59 u32 au0828_writereg(struct au0828_dev *dev, u16 reg, u32 val)
60 {
61 	dprintk(8, "%s(0x%04x, 0x%02x)\n", __func__, reg, val);
62 	return send_control_msg(dev, CMD_REQUEST_OUT, val, reg);
63 }
64 
send_control_msg(struct au0828_dev * dev,u16 request,u32 value,u16 index)65 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
66 	u16 index)
67 {
68 	int status = -ENODEV;
69 
70 	if (dev->usbdev) {
71 
72 		/* cp must be memory that has been allocated by kmalloc */
73 		status = usb_control_msg(dev->usbdev,
74 				usb_sndctrlpipe(dev->usbdev, 0),
75 				request,
76 				USB_DIR_OUT | USB_TYPE_VENDOR |
77 					USB_RECIP_DEVICE,
78 				value, index, NULL, 0, 1000);
79 
80 		status = min(status, 0);
81 
82 		if (status < 0) {
83 			pr_err("%s() Failed sending control message, error %d.\n",
84 				__func__, status);
85 		}
86 
87 	}
88 
89 	return status;
90 }
91 
recv_control_msg(struct au0828_dev * dev,u16 request,u32 value,u16 index,unsigned char * cp,u16 size)92 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
93 	u16 index, unsigned char *cp, u16 size)
94 {
95 	int status = -ENODEV;
96 	mutex_lock(&dev->mutex);
97 	if (dev->usbdev) {
98 		status = usb_control_msg(dev->usbdev,
99 				usb_rcvctrlpipe(dev->usbdev, 0),
100 				request,
101 				USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
102 				value, index,
103 				dev->ctrlmsg, size, 1000);
104 
105 		status = min(status, 0);
106 
107 		if (status < 0) {
108 			pr_err("%s() Failed receiving control message, error %d.\n",
109 				__func__, status);
110 		}
111 
112 		/* the host controller requires heap allocated memory, which
113 		   is why we didn't just pass "cp" into usb_control_msg */
114 		memcpy(cp, dev->ctrlmsg, size);
115 	}
116 	mutex_unlock(&dev->mutex);
117 	return status;
118 }
119 
120 #ifdef CONFIG_MEDIA_CONTROLLER
121 static void au0828_media_graph_notify(struct media_entity *new,
122 				      void *notify_data);
123 #endif
124 
au0828_unregister_media_device(struct au0828_dev * dev)125 static void au0828_unregister_media_device(struct au0828_dev *dev)
126 {
127 #ifdef CONFIG_MEDIA_CONTROLLER
128 	struct media_device *mdev = dev->media_dev;
129 	struct media_entity_notify *notify, *nextp;
130 
131 	if (!mdev || !media_devnode_is_registered(mdev->devnode))
132 		return;
133 
134 	/* Remove au0828 entity_notify callbacks */
135 	list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list) {
136 		if (notify->notify != au0828_media_graph_notify)
137 			continue;
138 		media_device_unregister_entity_notify(mdev, notify);
139 	}
140 
141 	/* clear enable_source, disable_source */
142 	mutex_lock(&mdev->graph_mutex);
143 	dev->media_dev->source_priv = NULL;
144 	dev->media_dev->enable_source = NULL;
145 	dev->media_dev->disable_source = NULL;
146 	mutex_unlock(&mdev->graph_mutex);
147 
148 	media_device_delete(dev->media_dev, KBUILD_MODNAME, THIS_MODULE);
149 	dev->media_dev = NULL;
150 #endif
151 }
152 
au0828_usb_release(struct au0828_dev * dev)153 void au0828_usb_release(struct au0828_dev *dev)
154 {
155 	au0828_unregister_media_device(dev);
156 
157 	/* I2C */
158 	au0828_i2c_unregister(dev);
159 
160 	kfree(dev);
161 }
162 
au0828_usb_disconnect(struct usb_interface * interface)163 static void au0828_usb_disconnect(struct usb_interface *interface)
164 {
165 	struct au0828_dev *dev = usb_get_intfdata(interface);
166 
167 	dprintk(1, "%s()\n", __func__);
168 
169 	/* there is a small window after disconnect, before
170 	   dev->usbdev is NULL, for poll (e.g: IR) try to access
171 	   the device and fill the dmesg with error messages.
172 	   Set the status so poll routines can check and avoid
173 	   access after disconnect.
174 	*/
175 	set_bit(DEV_DISCONNECTED, &dev->dev_state);
176 
177 	au0828_rc_unregister(dev);
178 	/* Digital TV */
179 	au0828_dvb_unregister(dev);
180 
181 	usb_set_intfdata(interface, NULL);
182 	mutex_lock(&dev->mutex);
183 	dev->usbdev = NULL;
184 	mutex_unlock(&dev->mutex);
185 	if (au0828_analog_unregister(dev)) {
186 		/*
187 		 * No need to call au0828_usb_release() if V4L2 is enabled,
188 		 * as this is already called via au0828_usb_v4l2_release()
189 		 */
190 		return;
191 	}
192 	au0828_usb_release(dev);
193 }
194 
au0828_media_device_init(struct au0828_dev * dev,struct usb_device * udev)195 static int au0828_media_device_init(struct au0828_dev *dev,
196 				    struct usb_device *udev)
197 {
198 #ifdef CONFIG_MEDIA_CONTROLLER
199 	struct media_device *mdev;
200 
201 	mdev = media_device_usb_allocate(udev, KBUILD_MODNAME, THIS_MODULE);
202 	if (IS_ERR(mdev))
203 		return PTR_ERR(mdev);
204 
205 	dev->media_dev = mdev;
206 #endif
207 	return 0;
208 }
209 
210 #ifdef CONFIG_MEDIA_CONTROLLER
au0828_media_graph_notify(struct media_entity * new,void * notify_data)211 static void au0828_media_graph_notify(struct media_entity *new,
212 				      void *notify_data)
213 {
214 	struct au0828_dev *dev = (struct au0828_dev *) notify_data;
215 	int ret;
216 	struct media_entity *entity, *mixer = NULL, *decoder = NULL;
217 
218 	if (!new) {
219 		/*
220 		 * Called during au0828 probe time to connect
221 		 * entities that were created prior to registering
222 		 * the notify handler. Find mixer and decoder.
223 		*/
224 		media_device_for_each_entity(entity, dev->media_dev) {
225 			if (entity->function == MEDIA_ENT_F_AUDIO_MIXER)
226 				mixer = entity;
227 			else if (entity->function == MEDIA_ENT_F_ATV_DECODER)
228 				decoder = entity;
229 		}
230 		goto create_link;
231 	}
232 
233 	switch (new->function) {
234 	case MEDIA_ENT_F_AUDIO_MIXER:
235 		mixer = new;
236 		if (dev->decoder)
237 			decoder = dev->decoder;
238 		break;
239 	case MEDIA_ENT_F_ATV_DECODER:
240 		/* In case, Mixer is added first, find mixer and create link */
241 		media_device_for_each_entity(entity, dev->media_dev) {
242 			if (entity->function == MEDIA_ENT_F_AUDIO_MIXER)
243 				mixer = entity;
244 		}
245 		decoder = new;
246 		break;
247 	default:
248 		break;
249 	}
250 
251 create_link:
252 	if (decoder && mixer) {
253 		ret = media_get_pad_index(decoder, false,
254 					  PAD_SIGNAL_AUDIO);
255 		if (ret >= 0)
256 			ret = media_create_pad_link(decoder, ret,
257 						    mixer, 0,
258 						    MEDIA_LNK_FL_ENABLED);
259 		if (ret < 0)
260 			dev_err(&dev->usbdev->dev,
261 				"Mixer Pad Link Create Error: %d\n", ret);
262 	}
263 }
264 
au0828_is_link_shareable(struct media_entity * owner,struct media_entity * entity)265 static bool au0828_is_link_shareable(struct media_entity *owner,
266 				     struct media_entity *entity)
267 {
268 	bool shareable = false;
269 
270 	/* Tuner link can be shared by audio, video, and VBI */
271 	switch (owner->function) {
272 	case MEDIA_ENT_F_IO_V4L:
273 	case MEDIA_ENT_F_AUDIO_CAPTURE:
274 	case MEDIA_ENT_F_IO_VBI:
275 		if (entity->function == MEDIA_ENT_F_IO_V4L ||
276 		    entity->function == MEDIA_ENT_F_AUDIO_CAPTURE ||
277 		    entity->function == MEDIA_ENT_F_IO_VBI)
278 			shareable = true;
279 		break;
280 	case MEDIA_ENT_F_DTV_DEMOD:
281 	default:
282 		break;
283 	}
284 	return shareable;
285 }
286 
287 /* Callers should hold graph_mutex */
au0828_enable_source(struct media_entity * entity,struct media_pipeline * pipe)288 static int au0828_enable_source(struct media_entity *entity,
289 				struct media_pipeline *pipe)
290 {
291 	struct media_entity  *source, *find_source;
292 	struct media_entity *sink;
293 	struct media_link *link, *found_link = NULL;
294 	int ret = 0;
295 	struct media_device *mdev = entity->graph_obj.mdev;
296 	struct au0828_dev *dev;
297 
298 	if (!mdev)
299 		return -ENODEV;
300 
301 	dev = mdev->source_priv;
302 
303 	/*
304 	 * For Audio and V4L2 entity, find the link to which decoder
305 	 * is the sink. Look for an active link between decoder and
306 	 * source (tuner/s-video/Composite), if one exists, nothing
307 	 * to do. If not, look for any  active links between source
308 	 * and any other entity. If one exists, source is busy. If
309 	 * source is free, setup link and start pipeline from source.
310 	 * For DVB FE entity, the source for the link is the tuner.
311 	 * Check if tuner is available and setup link and start
312 	 * pipeline.
313 	*/
314 	if (entity->function == MEDIA_ENT_F_DTV_DEMOD) {
315 		sink = entity;
316 		find_source = dev->tuner;
317 	} else {
318 		/* Analog isn't configured or register failed */
319 		if (!dev->decoder) {
320 			ret = -ENODEV;
321 			goto end;
322 		}
323 
324 		sink = dev->decoder;
325 
326 		/*
327 		 * Default input is tuner and default input_type
328 		 * is AU0828_VMUX_TELEVISION.
329 		 *
330 		 * There is a problem when s_input is called to
331 		 * change the default input. s_input will try to
332 		 * enable_source before attempting to change the
333 		 * input on the device, and will end up enabling
334 		 * default source which is tuner.
335 		 *
336 		 * Additional logic is necessary in au0828 to detect
337 		 * that the input has changed and enable the right
338 		 * source. au0828 handles this case in its s_input.
339 		 * It will disable the old source and enable the new
340 		 * source.
341 		 *
342 		*/
343 		if (dev->input_type == AU0828_VMUX_TELEVISION)
344 			find_source = dev->tuner;
345 		else if (dev->input_type == AU0828_VMUX_SVIDEO ||
346 			 dev->input_type == AU0828_VMUX_COMPOSITE)
347 			find_source = &dev->input_ent[dev->input_type];
348 		else {
349 			/* unknown input - let user select input */
350 			ret = 0;
351 			goto end;
352 		}
353 	}
354 
355 	/* Is there an active link between sink and source */
356 	if (dev->active_link) {
357 		if (dev->active_link_owner == entity) {
358 			/* This check is necessary to handle multiple
359 			 * enable_source calls from v4l_ioctls during
360 			 * the course of video/vbi application run-time.
361 			*/
362 			pr_debug("%s already owns the tuner\n", entity->name);
363 			ret = 0;
364 			goto end;
365 		} else if (au0828_is_link_shareable(dev->active_link_owner,
366 			   entity)) {
367 			/* Either ALSA or Video own tuner. Sink is the same
368 			 * for both. Allow sharing the active link between
369 			 * their common source (tuner) and sink (decoder).
370 			 * Starting pipeline between sharing entity and sink
371 			 * will fail with pipe mismatch, while owner has an
372 			 * active pipeline. Switch pipeline ownership from
373 			 * user to owner when owner disables the source.
374 			 */
375 			dev->active_link_shared = true;
376 			/* save the user info to use from disable */
377 			dev->active_link_user = entity;
378 			dev->active_link_user_pipe = pipe;
379 			pr_debug("%s owns the tuner %s can share!\n",
380 				 dev->active_link_owner->name,
381 				 entity->name);
382 			ret = 0;
383 			goto end;
384 		} else {
385 			ret = -EBUSY;
386 			goto end;
387 		}
388 	}
389 
390 	list_for_each_entry(link, &sink->links, list) {
391 		/* Check sink, and source */
392 		if (link->sink->entity == sink &&
393 		    link->source->entity == find_source) {
394 			found_link = link;
395 			break;
396 		}
397 	}
398 
399 	if (!found_link) {
400 		ret = -ENODEV;
401 		goto end;
402 	}
403 
404 	/* activate link between source and sink and start pipeline */
405 	source = found_link->source->entity;
406 	ret = __media_entity_setup_link(found_link, MEDIA_LNK_FL_ENABLED);
407 	if (ret) {
408 		pr_err("Activate link from %s->%s. Error %d\n",
409 			source->name, sink->name, ret);
410 		goto end;
411 	}
412 
413 	ret = __media_pipeline_start(entity, pipe);
414 	if (ret) {
415 		pr_err("Start Pipeline: %s->%s Error %d\n",
416 			source->name, entity->name, ret);
417 		ret = __media_entity_setup_link(found_link, 0);
418 		if (ret)
419 			pr_err("Deactivate link Error %d\n", ret);
420 		goto end;
421 	}
422 
423 	/* save link state to allow audio and video share the link
424 	 * and not disable the link while the other is using it.
425 	 * active_link_owner is used to deactivate the link.
426 	*/
427 	dev->active_link = found_link;
428 	dev->active_link_owner = entity;
429 	dev->active_source = source;
430 	dev->active_sink = sink;
431 
432 	pr_info("Enabled Source: %s->%s->%s Ret %d\n",
433 		 dev->active_source->name, dev->active_sink->name,
434 		 dev->active_link_owner->name, ret);
435 end:
436 	pr_debug("%s end: ent:%s fnc:%d ret %d\n",
437 		 __func__, entity->name, entity->function, ret);
438 	return ret;
439 }
440 
441 /* Callers should hold graph_mutex */
au0828_disable_source(struct media_entity * entity)442 static void au0828_disable_source(struct media_entity *entity)
443 {
444 	int ret = 0;
445 	struct media_device *mdev = entity->graph_obj.mdev;
446 	struct au0828_dev *dev;
447 
448 	if (!mdev)
449 		return;
450 
451 	dev = mdev->source_priv;
452 
453 	if (!dev->active_link)
454 		return;
455 
456 	/* link is active - stop pipeline from source
457 	 * (tuner/s-video/Composite) to the entity
458 	 * When DVB/s-video/Composite owns tuner, it won't be in
459 	 * shared state.
460 	 */
461 	if (dev->active_link->sink->entity == dev->active_sink &&
462 	    dev->active_link->source->entity == dev->active_source) {
463 		/*
464 		 * Prevent video from deactivating link when audio
465 		 * has active pipeline and vice versa. In addition
466 		 * handle the case when more than one video/vbi
467 		 * application is sharing the link.
468 		*/
469 		bool owner_is_audio = false;
470 
471 		if (dev->active_link_owner->function ==
472 		    MEDIA_ENT_F_AUDIO_CAPTURE)
473 			owner_is_audio = true;
474 
475 		if (dev->active_link_shared) {
476 			pr_debug("Shared link owner %s user %s %d\n",
477 				 dev->active_link_owner->name,
478 				 entity->name, dev->users);
479 
480 			/* Handle video device users > 1
481 			 * When audio owns the shared link with
482 			 * more than one video users, avoid
483 			 * disabling the source and/or switching
484 			 * the owner until the last disable_source
485 			 * call from video _close(). Use dev->users to
486 			 * determine when to switch/disable.
487 			 */
488 			if (dev->active_link_owner != entity) {
489 				/* video device has users > 1 */
490 				if (owner_is_audio && dev->users > 1)
491 					return;
492 
493 				dev->active_link_user = NULL;
494 				dev->active_link_user_pipe = NULL;
495 				dev->active_link_shared = false;
496 				return;
497 			}
498 
499 			/* video owns the link and has users > 1 */
500 			if (!owner_is_audio && dev->users > 1)
501 				return;
502 
503 			/* stop pipeline */
504 			__media_pipeline_stop(dev->active_link_owner);
505 			pr_debug("Pipeline stop for %s\n",
506 				dev->active_link_owner->name);
507 
508 			ret = __media_pipeline_start(
509 					dev->active_link_user,
510 					dev->active_link_user_pipe);
511 			if (ret) {
512 				pr_err("Start Pipeline: %s->%s %d\n",
513 					dev->active_source->name,
514 					dev->active_link_user->name,
515 					ret);
516 				goto deactivate_link;
517 			}
518 			/* link user is now the owner */
519 			dev->active_link_owner = dev->active_link_user;
520 			dev->active_link_user = NULL;
521 			dev->active_link_user_pipe = NULL;
522 			dev->active_link_shared = false;
523 
524 			pr_debug("Pipeline started for %s\n",
525 				dev->active_link_owner->name);
526 			return;
527 		} else if (!owner_is_audio && dev->users > 1)
528 			/* video/vbi owns the link and has users > 1 */
529 			return;
530 
531 		if (dev->active_link_owner != entity)
532 			return;
533 
534 		/* stop pipeline */
535 		__media_pipeline_stop(dev->active_link_owner);
536 		pr_debug("Pipeline stop for %s\n",
537 			dev->active_link_owner->name);
538 
539 deactivate_link:
540 		ret = __media_entity_setup_link(dev->active_link, 0);
541 		if (ret)
542 			pr_err("Deactivate link Error %d\n", ret);
543 
544 		pr_info("Disabled Source: %s->%s->%s Ret %d\n",
545 			 dev->active_source->name, dev->active_sink->name,
546 			 dev->active_link_owner->name, ret);
547 
548 		dev->active_link = NULL;
549 		dev->active_link_owner = NULL;
550 		dev->active_source = NULL;
551 		dev->active_sink = NULL;
552 		dev->active_link_shared = false;
553 		dev->active_link_user = NULL;
554 	}
555 }
556 #endif
557 
au0828_media_device_register(struct au0828_dev * dev,struct usb_device * udev)558 static int au0828_media_device_register(struct au0828_dev *dev,
559 					struct usb_device *udev)
560 {
561 #ifdef CONFIG_MEDIA_CONTROLLER
562 	int ret;
563 	struct media_entity *entity, *demod = NULL;
564 	struct media_link *link;
565 
566 	if (!dev->media_dev)
567 		return 0;
568 
569 	if (!media_devnode_is_registered(dev->media_dev->devnode)) {
570 
571 		/* register media device */
572 		ret = media_device_register(dev->media_dev);
573 		if (ret) {
574 			media_device_delete(dev->media_dev, KBUILD_MODNAME,
575 					    THIS_MODULE);
576 			dev->media_dev = NULL;
577 			dev_err(&udev->dev,
578 				"Media Device Register Error: %d\n", ret);
579 			return ret;
580 		}
581 	} else {
582 		/*
583 		 * Call au0828_media_graph_notify() to connect
584 		 * audio graph to our graph. In this case, audio
585 		 * driver registered the device and there is no
586 		 * entity_notify to be called when new entities
587 		 * are added. Invoke it now.
588 		*/
589 		au0828_media_graph_notify(NULL, (void *) dev);
590 	}
591 
592 	/*
593 	 * Find tuner, decoder and demod.
594 	 *
595 	 * The tuner and decoder should be cached, as they'll be used by
596 	 *	au0828_enable_source.
597 	 *
598 	 * It also needs to disable the link between tuner and
599 	 * decoder/demod, to avoid disable step when tuner is requested
600 	 * by video or audio. Note that this step can't be done until dvb
601 	 * graph is created during dvb register.
602 	*/
603 	media_device_for_each_entity(entity, dev->media_dev) {
604 		switch (entity->function) {
605 		case MEDIA_ENT_F_TUNER:
606 			dev->tuner = entity;
607 			break;
608 		case MEDIA_ENT_F_ATV_DECODER:
609 			dev->decoder = entity;
610 			break;
611 		case MEDIA_ENT_F_DTV_DEMOD:
612 			demod = entity;
613 			break;
614 		}
615 	}
616 
617 	/* Disable link between tuner->demod and/or tuner->decoder */
618 	if (dev->tuner) {
619 		list_for_each_entry(link, &dev->tuner->links, list) {
620 			if (demod && link->sink->entity == demod)
621 				media_entity_setup_link(link, 0);
622 			if (dev->decoder && link->sink->entity == dev->decoder)
623 				media_entity_setup_link(link, 0);
624 		}
625 	}
626 
627 	/* register entity_notify callback */
628 	dev->entity_notify.notify_data = (void *) dev;
629 	dev->entity_notify.notify = (void *) au0828_media_graph_notify;
630 	ret = media_device_register_entity_notify(dev->media_dev,
631 						  &dev->entity_notify);
632 	if (ret) {
633 		dev_err(&udev->dev,
634 			"Media Device register entity_notify Error: %d\n",
635 			ret);
636 		return ret;
637 	}
638 	/* set enable_source */
639 	mutex_lock(&dev->media_dev->graph_mutex);
640 	dev->media_dev->source_priv = (void *) dev;
641 	dev->media_dev->enable_source = au0828_enable_source;
642 	dev->media_dev->disable_source = au0828_disable_source;
643 	mutex_unlock(&dev->media_dev->graph_mutex);
644 #endif
645 	return 0;
646 }
647 
au0828_usb_probe(struct usb_interface * interface,const struct usb_device_id * id)648 static int au0828_usb_probe(struct usb_interface *interface,
649 	const struct usb_device_id *id)
650 {
651 	int ifnum;
652 	int retval = 0;
653 
654 	struct au0828_dev *dev;
655 	struct usb_device *usbdev = interface_to_usbdev(interface);
656 
657 	ifnum = interface->altsetting->desc.bInterfaceNumber;
658 
659 	if (ifnum != 0)
660 		return -ENODEV;
661 
662 	dprintk(1, "%s() vendor id 0x%x device id 0x%x ifnum:%d\n", __func__,
663 		le16_to_cpu(usbdev->descriptor.idVendor),
664 		le16_to_cpu(usbdev->descriptor.idProduct),
665 		ifnum);
666 
667 	/*
668 	 * Make sure we have 480 Mbps of bandwidth, otherwise things like
669 	 * video stream wouldn't likely work, since 12 Mbps is generally
670 	 * not enough even for most Digital TV streams.
671 	 */
672 	if (usbdev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) {
673 		pr_err("au0828: Device initialization failed.\n");
674 		pr_err("au0828: Device must be connected to a high-speed USB 2.0 port.\n");
675 		return -ENODEV;
676 	}
677 
678 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
679 	if (dev == NULL) {
680 		pr_err("%s() Unable to allocate memory\n", __func__);
681 		return -ENOMEM;
682 	}
683 
684 	mutex_init(&dev->lock);
685 	mutex_lock(&dev->lock);
686 	mutex_init(&dev->mutex);
687 	mutex_init(&dev->dvb.lock);
688 	dev->usbdev = usbdev;
689 	dev->boardnr = id->driver_info;
690 	dev->board = au0828_boards[dev->boardnr];
691 
692 	/* Initialize the media controller */
693 	retval = au0828_media_device_init(dev, usbdev);
694 	if (retval) {
695 		pr_err("%s() au0828_media_device_init failed\n",
696 		       __func__);
697 		mutex_unlock(&dev->lock);
698 		kfree(dev);
699 		return retval;
700 	}
701 
702 	retval = au0828_v4l2_device_register(interface, dev);
703 	if (retval) {
704 		au0828_usb_v4l2_media_release(dev);
705 		mutex_unlock(&dev->lock);
706 		kfree(dev);
707 		return retval;
708 	}
709 
710 	/* Power Up the bridge */
711 	au0828_write(dev, REG_600, 1 << 4);
712 
713 	/* Bring up the GPIO's and supporting devices */
714 	au0828_gpio_setup(dev);
715 
716 	/* I2C */
717 	au0828_i2c_register(dev);
718 
719 	/* Setup */
720 	au0828_card_setup(dev);
721 
722 	/*
723 	 * Store the pointer to the au0828_dev so it can be accessed in
724 	 * au0828_usb_disconnect
725 	 */
726 	usb_set_intfdata(interface, dev);
727 
728 	/* Analog TV */
729 	retval = au0828_analog_register(dev, interface);
730 	if (retval) {
731 		pr_err("%s() au0828_analog_register failed to register on V4L2\n",
732 			__func__);
733 		mutex_unlock(&dev->lock);
734 		goto done;
735 	}
736 
737 	/* Digital TV */
738 	retval = au0828_dvb_register(dev);
739 	if (retval)
740 		pr_err("%s() au0828_dvb_register failed\n",
741 		       __func__);
742 
743 	/* Remote controller */
744 	au0828_rc_register(dev);
745 
746 	pr_info("Registered device AU0828 [%s]\n",
747 		dev->board.name == NULL ? "Unset" : dev->board.name);
748 
749 	mutex_unlock(&dev->lock);
750 
751 	retval = au0828_media_device_register(dev, usbdev);
752 
753 done:
754 	if (retval < 0)
755 		au0828_usb_disconnect(interface);
756 
757 	return retval;
758 }
759 
au0828_suspend(struct usb_interface * interface,pm_message_t message)760 static int au0828_suspend(struct usb_interface *interface,
761 				pm_message_t message)
762 {
763 	struct au0828_dev *dev = usb_get_intfdata(interface);
764 
765 	if (!dev)
766 		return 0;
767 
768 	pr_info("Suspend\n");
769 
770 	au0828_rc_suspend(dev);
771 	au0828_v4l2_suspend(dev);
772 	au0828_dvb_suspend(dev);
773 
774 	/* FIXME: should suspend also ATV/DTV */
775 
776 	return 0;
777 }
778 
au0828_resume(struct usb_interface * interface)779 static int au0828_resume(struct usb_interface *interface)
780 {
781 	struct au0828_dev *dev = usb_get_intfdata(interface);
782 	if (!dev)
783 		return 0;
784 
785 	pr_info("Resume\n");
786 
787 	/* Power Up the bridge */
788 	au0828_write(dev, REG_600, 1 << 4);
789 
790 	/* Bring up the GPIO's and supporting devices */
791 	au0828_gpio_setup(dev);
792 
793 	au0828_rc_resume(dev);
794 	au0828_v4l2_resume(dev);
795 	au0828_dvb_resume(dev);
796 
797 	/* FIXME: should resume also ATV/DTV */
798 
799 	return 0;
800 }
801 
802 static struct usb_driver au0828_usb_driver = {
803 	.name		= KBUILD_MODNAME,
804 	.probe		= au0828_usb_probe,
805 	.disconnect	= au0828_usb_disconnect,
806 	.id_table	= au0828_usb_id_table,
807 	.suspend	= au0828_suspend,
808 	.resume		= au0828_resume,
809 	.reset_resume	= au0828_resume,
810 };
811 
au0828_init(void)812 static int __init au0828_init(void)
813 {
814 	int ret;
815 
816 	if (au0828_debug & 1)
817 		pr_info("%s() Debugging is enabled\n", __func__);
818 
819 	if (au0828_debug & 2)
820 		pr_info("%s() USB Debugging is enabled\n", __func__);
821 
822 	if (au0828_debug & 4)
823 		pr_info("%s() I2C Debugging is enabled\n", __func__);
824 
825 	if (au0828_debug & 8)
826 		pr_info("%s() Bridge Debugging is enabled\n",
827 		       __func__);
828 
829 	if (au0828_debug & 16)
830 		pr_info("%s() IR Debugging is enabled\n",
831 		       __func__);
832 
833 	pr_info("au0828 driver loaded\n");
834 
835 	ret = usb_register(&au0828_usb_driver);
836 	if (ret)
837 		pr_err("usb_register failed, error = %d\n", ret);
838 
839 	return ret;
840 }
841 
au0828_exit(void)842 static void __exit au0828_exit(void)
843 {
844 	usb_deregister(&au0828_usb_driver);
845 }
846 
847 module_init(au0828_init);
848 module_exit(au0828_exit);
849 
850 MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");
851 MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
852 MODULE_LICENSE("GPL");
853 MODULE_VERSION("0.0.3");
854