Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / media / usb / au0828 / au0828-core.c
blobcd363a2100d453c6b5be15b35430907acd44cdde
1 /*
2 * Driver for the Auvitek USB bridge
4 * Copyright (c) 2008 Steven Toth <stoth@linuxtv.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
18 #include "au0828.h"
19 #include "au8522.h"
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 #include <linux/videodev2.h>
24 #include <media/v4l2-common.h>
25 #include <linux/mutex.h>
27 /* Due to enum tuner_pad_index */
28 #include <media/tuner.h>
31 * 1 = General debug messages
32 * 2 = USB handling
33 * 4 = I2C related
34 * 8 = Bridge related
35 * 16 = IR related
37 int au0828_debug;
38 module_param_named(debug, au0828_debug, int, 0644);
39 MODULE_PARM_DESC(debug,
40 "set debug bitmask: 1=general, 2=USB, 4=I2C, 8=bridge, 16=IR");
42 static unsigned int disable_usb_speed_check;
43 module_param(disable_usb_speed_check, int, 0444);
44 MODULE_PARM_DESC(disable_usb_speed_check,
45 "override min bandwidth requirement of 480M bps");
47 #define _AU0828_BULKPIPE 0x03
48 #define _BULKPIPESIZE 0xffff
50 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
51 u16 index);
52 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
53 u16 index, unsigned char *cp, u16 size);
55 /* USB Direction */
56 #define CMD_REQUEST_IN 0x00
57 #define CMD_REQUEST_OUT 0x01
59 u32 au0828_readreg(struct au0828_dev *dev, u16 reg)
61 u8 result = 0;
63 recv_control_msg(dev, CMD_REQUEST_IN, 0, reg, &result, 1);
64 dprintk(8, "%s(0x%04x) = 0x%02x\n", __func__, reg, result);
66 return result;
69 u32 au0828_writereg(struct au0828_dev *dev, u16 reg, u32 val)
71 dprintk(8, "%s(0x%04x, 0x%02x)\n", __func__, reg, val);
72 return send_control_msg(dev, CMD_REQUEST_OUT, val, reg);
75 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
76 u16 index)
78 int status = -ENODEV;
80 if (dev->usbdev) {
82 /* cp must be memory that has been allocated by kmalloc */
83 status = usb_control_msg(dev->usbdev,
84 usb_sndctrlpipe(dev->usbdev, 0),
85 request,
86 USB_DIR_OUT | USB_TYPE_VENDOR |
87 USB_RECIP_DEVICE,
88 value, index, NULL, 0, 1000);
90 status = min(status, 0);
92 if (status < 0) {
93 pr_err("%s() Failed sending control message, error %d.\n",
94 __func__, status);
99 return status;
102 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
103 u16 index, unsigned char *cp, u16 size)
105 int status = -ENODEV;
106 mutex_lock(&dev->mutex);
107 if (dev->usbdev) {
108 status = usb_control_msg(dev->usbdev,
109 usb_rcvctrlpipe(dev->usbdev, 0),
110 request,
111 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
112 value, index,
113 dev->ctrlmsg, size, 1000);
115 status = min(status, 0);
117 if (status < 0) {
118 pr_err("%s() Failed receiving control message, error %d.\n",
119 __func__, status);
122 /* the host controller requires heap allocated memory, which
123 is why we didn't just pass "cp" into usb_control_msg */
124 memcpy(cp, dev->ctrlmsg, size);
126 mutex_unlock(&dev->mutex);
127 return status;
130 #ifdef CONFIG_MEDIA_CONTROLLER
131 static void au0828_media_graph_notify(struct media_entity *new,
132 void *notify_data);
133 #endif
135 static void au0828_unregister_media_device(struct au0828_dev *dev)
137 #ifdef CONFIG_MEDIA_CONTROLLER
138 struct media_device *mdev = dev->media_dev;
139 struct media_entity_notify *notify, *nextp;
141 if (!mdev || !media_devnode_is_registered(mdev->devnode))
142 return;
144 /* Remove au0828 entity_notify callbacks */
145 list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list) {
146 if (notify->notify != au0828_media_graph_notify)
147 continue;
148 media_device_unregister_entity_notify(mdev, notify);
151 /* clear enable_source, disable_source */
152 mutex_lock(&mdev->graph_mutex);
153 dev->media_dev->source_priv = NULL;
154 dev->media_dev->enable_source = NULL;
155 dev->media_dev->disable_source = NULL;
156 mutex_unlock(&mdev->graph_mutex);
158 media_device_unregister(dev->media_dev);
159 media_device_cleanup(dev->media_dev);
160 kfree(dev->media_dev);
161 dev->media_dev = NULL;
162 #endif
165 void au0828_usb_release(struct au0828_dev *dev)
167 au0828_unregister_media_device(dev);
169 /* I2C */
170 au0828_i2c_unregister(dev);
172 kfree(dev);
175 static void au0828_usb_disconnect(struct usb_interface *interface)
177 struct au0828_dev *dev = usb_get_intfdata(interface);
179 dprintk(1, "%s()\n", __func__);
181 /* there is a small window after disconnect, before
182 dev->usbdev is NULL, for poll (e.g: IR) try to access
183 the device and fill the dmesg with error messages.
184 Set the status so poll routines can check and avoid
185 access after disconnect.
187 set_bit(DEV_DISCONNECTED, &dev->dev_state);
189 au0828_rc_unregister(dev);
190 /* Digital TV */
191 au0828_dvb_unregister(dev);
193 usb_set_intfdata(interface, NULL);
194 mutex_lock(&dev->mutex);
195 dev->usbdev = NULL;
196 mutex_unlock(&dev->mutex);
197 if (au0828_analog_unregister(dev)) {
199 * No need to call au0828_usb_release() if V4L2 is enabled,
200 * as this is already called via au0828_usb_v4l2_release()
202 return;
204 au0828_usb_release(dev);
207 static int au0828_media_device_init(struct au0828_dev *dev,
208 struct usb_device *udev)
210 #ifdef CONFIG_MEDIA_CONTROLLER
211 struct media_device *mdev;
213 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
214 if (!mdev)
215 return -ENOMEM;
217 /* check if media device is already initialized */
218 if (!mdev->dev)
219 media_device_usb_init(mdev, udev, udev->product);
221 dev->media_dev = mdev;
222 #endif
223 return 0;
226 #ifdef CONFIG_MEDIA_CONTROLLER
227 static void au0828_media_graph_notify(struct media_entity *new,
228 void *notify_data)
230 struct au0828_dev *dev = (struct au0828_dev *) notify_data;
231 int ret;
232 struct media_entity *entity, *mixer = NULL, *decoder = NULL;
234 if (!new) {
236 * Called during au0828 probe time to connect
237 * entites that were created prior to registering
238 * the notify handler. Find mixer and decoder.
240 media_device_for_each_entity(entity, dev->media_dev) {
241 if (entity->function == MEDIA_ENT_F_AUDIO_MIXER)
242 mixer = entity;
243 else if (entity->function == MEDIA_ENT_F_ATV_DECODER)
244 decoder = entity;
246 goto create_link;
249 switch (new->function) {
250 case MEDIA_ENT_F_AUDIO_MIXER:
251 mixer = new;
252 if (dev->decoder)
253 decoder = dev->decoder;
254 break;
255 case MEDIA_ENT_F_ATV_DECODER:
256 /* In case, Mixer is added first, find mixer and create link */
257 media_device_for_each_entity(entity, dev->media_dev) {
258 if (entity->function == MEDIA_ENT_F_AUDIO_MIXER)
259 mixer = entity;
261 decoder = new;
262 break;
263 default:
264 break;
267 create_link:
268 if (decoder && mixer) {
269 ret = media_create_pad_link(decoder,
270 DEMOD_PAD_AUDIO_OUT,
271 mixer, 0,
272 MEDIA_LNK_FL_ENABLED);
273 if (ret)
274 dev_err(&dev->usbdev->dev,
275 "Mixer Pad Link Create Error: %d\n", ret);
279 /* Callers should hold graph_mutex */
280 static int au0828_enable_source(struct media_entity *entity,
281 struct media_pipeline *pipe)
283 struct media_entity *source, *find_source;
284 struct media_entity *sink;
285 struct media_link *link, *found_link = NULL;
286 int ret = 0;
287 struct media_device *mdev = entity->graph_obj.mdev;
288 struct au0828_dev *dev;
290 if (!mdev)
291 return -ENODEV;
293 dev = mdev->source_priv;
296 * For Audio and V4L2 entity, find the link to which decoder
297 * is the sink. Look for an active link between decoder and
298 * source (tuner/s-video/Composite), if one exists, nothing
299 * to do. If not, look for any active links between source
300 * and any other entity. If one exists, source is busy. If
301 * source is free, setup link and start pipeline from source.
302 * For DVB FE entity, the source for the link is the tuner.
303 * Check if tuner is available and setup link and start
304 * pipeline.
306 if (entity->function == MEDIA_ENT_F_DTV_DEMOD) {
307 sink = entity;
308 find_source = dev->tuner;
309 } else {
310 /* Analog isn't configured or register failed */
311 if (!dev->decoder) {
312 ret = -ENODEV;
313 goto end;
316 sink = dev->decoder;
319 * Default input is tuner and default input_type
320 * is AU0828_VMUX_TELEVISION.
321 * FIXME:
322 * There is a problem when s_input is called to
323 * change the default input. s_input will try to
324 * enable_source before attempting to change the
325 * input on the device, and will end up enabling
326 * default source which is tuner.
328 * Additional logic is necessary in au0828
329 * to detect that the input has changed and
330 * enable the right source.
333 if (dev->input_type == AU0828_VMUX_TELEVISION)
334 find_source = dev->tuner;
335 else if (dev->input_type == AU0828_VMUX_SVIDEO ||
336 dev->input_type == AU0828_VMUX_COMPOSITE)
337 find_source = &dev->input_ent[dev->input_type];
338 else {
339 /* unknown input - let user select input */
340 ret = 0;
341 goto end;
345 /* Is an active link between sink and source */
346 if (dev->active_link) {
348 * If DVB is using the tuner and calling entity is
349 * audio/video, the following check will be false,
350 * since sink is different. Result is Busy.
352 if (dev->active_link->sink->entity == sink &&
353 dev->active_link->source->entity == find_source) {
355 * Either ALSA or Video own tuner. sink is
356 * the same for both. Prevent Video stepping
357 * on ALSA when ALSA owns the source.
359 if (dev->active_link_owner != entity &&
360 dev->active_link_owner->function ==
361 MEDIA_ENT_F_AUDIO_CAPTURE) {
362 pr_debug("ALSA has the tuner\n");
363 ret = -EBUSY;
364 goto end;
366 ret = 0;
367 goto end;
368 } else {
369 ret = -EBUSY;
370 goto end;
374 list_for_each_entry(link, &sink->links, list) {
375 /* Check sink, and source */
376 if (link->sink->entity == sink &&
377 link->source->entity == find_source) {
378 found_link = link;
379 break;
383 if (!found_link) {
384 ret = -ENODEV;
385 goto end;
388 /* activate link between source and sink and start pipeline */
389 source = found_link->source->entity;
390 ret = __media_entity_setup_link(found_link, MEDIA_LNK_FL_ENABLED);
391 if (ret) {
392 pr_err("Activate tuner link %s->%s. Error %d\n",
393 source->name, sink->name, ret);
394 goto end;
397 ret = __media_pipeline_start(entity, pipe);
398 if (ret) {
399 pr_err("Start Pipeline: %s->%s Error %d\n",
400 source->name, entity->name, ret);
401 ret = __media_entity_setup_link(found_link, 0);
402 pr_err("Deactivate link Error %d\n", ret);
403 goto end;
406 * save active link and active link owner to avoid audio
407 * deactivating video owned link from disable_source and
408 * vice versa
410 dev->active_link = found_link;
411 dev->active_link_owner = entity;
412 dev->active_source = source;
413 dev->active_sink = sink;
415 pr_debug("Enabled Source: %s->%s->%s Ret %d\n",
416 dev->active_source->name, dev->active_sink->name,
417 dev->active_link_owner->name, ret);
418 end:
419 pr_debug("au0828_enable_source() end %s %d %d\n",
420 entity->name, entity->function, ret);
421 return ret;
424 /* Callers should hold graph_mutex */
425 static void au0828_disable_source(struct media_entity *entity)
427 int ret = 0;
428 struct media_device *mdev = entity->graph_obj.mdev;
429 struct au0828_dev *dev;
431 if (!mdev)
432 return;
434 dev = mdev->source_priv;
436 if (!dev->active_link)
437 return;
439 /* link is active - stop pipeline from source (tuner) */
440 if (dev->active_link->sink->entity == dev->active_sink &&
441 dev->active_link->source->entity == dev->active_source) {
443 * prevent video from deactivating link when audio
444 * has active pipeline
446 if (dev->active_link_owner != entity)
447 return;
448 __media_pipeline_stop(entity);
449 ret = __media_entity_setup_link(dev->active_link, 0);
450 if (ret)
451 pr_err("Deactivate link Error %d\n", ret);
453 pr_debug("Disabled Source: %s->%s->%s Ret %d\n",
454 dev->active_source->name, dev->active_sink->name,
455 dev->active_link_owner->name, ret);
457 dev->active_link = NULL;
458 dev->active_link_owner = NULL;
459 dev->active_source = NULL;
460 dev->active_sink = NULL;
463 #endif
465 static int au0828_media_device_register(struct au0828_dev *dev,
466 struct usb_device *udev)
468 #ifdef CONFIG_MEDIA_CONTROLLER
469 int ret;
470 struct media_entity *entity, *demod = NULL;
471 struct media_link *link;
473 if (!dev->media_dev)
474 return 0;
476 if (!media_devnode_is_registered(dev->media_dev->devnode)) {
478 /* register media device */
479 ret = media_device_register(dev->media_dev);
480 if (ret) {
481 dev_err(&udev->dev,
482 "Media Device Register Error: %d\n", ret);
483 return ret;
485 } else {
487 * Call au0828_media_graph_notify() to connect
488 * audio graph to our graph. In this case, audio
489 * driver registered the device and there is no
490 * entity_notify to be called when new entities
491 * are added. Invoke it now.
493 au0828_media_graph_notify(NULL, (void *) dev);
497 * Find tuner, decoder and demod.
499 * The tuner and decoder should be cached, as they'll be used by
500 * au0828_enable_source.
502 * It also needs to disable the link between tuner and
503 * decoder/demod, to avoid disable step when tuner is requested
504 * by video or audio. Note that this step can't be done until dvb
505 * graph is created during dvb register.
507 media_device_for_each_entity(entity, dev->media_dev) {
508 switch (entity->function) {
509 case MEDIA_ENT_F_TUNER:
510 dev->tuner = entity;
511 break;
512 case MEDIA_ENT_F_ATV_DECODER:
513 dev->decoder = entity;
514 break;
515 case MEDIA_ENT_F_DTV_DEMOD:
516 demod = entity;
517 break;
521 /* Disable link between tuner->demod and/or tuner->decoder */
522 if (dev->tuner) {
523 list_for_each_entry(link, &dev->tuner->links, list) {
524 if (demod && link->sink->entity == demod)
525 media_entity_setup_link(link, 0);
526 if (dev->decoder && link->sink->entity == dev->decoder)
527 media_entity_setup_link(link, 0);
531 /* register entity_notify callback */
532 dev->entity_notify.notify_data = (void *) dev;
533 dev->entity_notify.notify = (void *) au0828_media_graph_notify;
534 ret = media_device_register_entity_notify(dev->media_dev,
535 &dev->entity_notify);
536 if (ret) {
537 dev_err(&udev->dev,
538 "Media Device register entity_notify Error: %d\n",
539 ret);
540 return ret;
542 /* set enable_source */
543 mutex_lock(&dev->media_dev->graph_mutex);
544 dev->media_dev->source_priv = (void *) dev;
545 dev->media_dev->enable_source = au0828_enable_source;
546 dev->media_dev->disable_source = au0828_disable_source;
547 mutex_unlock(&dev->media_dev->graph_mutex);
548 #endif
549 return 0;
552 static int au0828_usb_probe(struct usb_interface *interface,
553 const struct usb_device_id *id)
555 int ifnum;
556 int retval = 0;
558 struct au0828_dev *dev;
559 struct usb_device *usbdev = interface_to_usbdev(interface);
561 ifnum = interface->altsetting->desc.bInterfaceNumber;
563 if (ifnum != 0)
564 return -ENODEV;
566 dprintk(1, "%s() vendor id 0x%x device id 0x%x ifnum:%d\n", __func__,
567 le16_to_cpu(usbdev->descriptor.idVendor),
568 le16_to_cpu(usbdev->descriptor.idProduct),
569 ifnum);
572 * Make sure we have 480 Mbps of bandwidth, otherwise things like
573 * video stream wouldn't likely work, since 12 Mbps is generally
574 * not enough even for most Digital TV streams.
576 if (usbdev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) {
577 pr_err("au0828: Device initialization failed.\n");
578 pr_err("au0828: Device must be connected to a high-speed USB 2.0 port.\n");
579 return -ENODEV;
582 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
583 if (dev == NULL) {
584 pr_err("%s() Unable to allocate memory\n", __func__);
585 return -ENOMEM;
588 mutex_init(&dev->lock);
589 mutex_lock(&dev->lock);
590 mutex_init(&dev->mutex);
591 mutex_init(&dev->dvb.lock);
592 dev->usbdev = usbdev;
593 dev->boardnr = id->driver_info;
594 dev->board = au0828_boards[dev->boardnr];
596 /* Initialize the media controller */
597 retval = au0828_media_device_init(dev, usbdev);
598 if (retval) {
599 pr_err("%s() au0828_media_device_init failed\n",
600 __func__);
601 mutex_unlock(&dev->lock);
602 kfree(dev);
603 return retval;
606 retval = au0828_v4l2_device_register(interface, dev);
607 if (retval) {
608 au0828_usb_v4l2_media_release(dev);
609 mutex_unlock(&dev->lock);
610 kfree(dev);
611 return retval;
614 /* Power Up the bridge */
615 au0828_write(dev, REG_600, 1 << 4);
617 /* Bring up the GPIO's and supporting devices */
618 au0828_gpio_setup(dev);
620 /* I2C */
621 au0828_i2c_register(dev);
623 /* Setup */
624 au0828_card_setup(dev);
626 /* Analog TV */
627 retval = au0828_analog_register(dev, interface);
628 if (retval) {
629 pr_err("%s() au0282_dev_register failed to register on V4L2\n",
630 __func__);
631 mutex_unlock(&dev->lock);
632 kfree(dev);
633 goto done;
636 /* Digital TV */
637 retval = au0828_dvb_register(dev);
638 if (retval)
639 pr_err("%s() au0282_dev_register failed\n",
640 __func__);
642 /* Remote controller */
643 au0828_rc_register(dev);
646 * Store the pointer to the au0828_dev so it can be accessed in
647 * au0828_usb_disconnect
649 usb_set_intfdata(interface, dev);
651 pr_info("Registered device AU0828 [%s]\n",
652 dev->board.name == NULL ? "Unset" : dev->board.name);
654 mutex_unlock(&dev->lock);
656 retval = au0828_media_device_register(dev, usbdev);
658 done:
659 if (retval < 0)
660 au0828_usb_disconnect(interface);
662 return retval;
665 static int au0828_suspend(struct usb_interface *interface,
666 pm_message_t message)
668 struct au0828_dev *dev = usb_get_intfdata(interface);
670 if (!dev)
671 return 0;
673 pr_info("Suspend\n");
675 au0828_rc_suspend(dev);
676 au0828_v4l2_suspend(dev);
677 au0828_dvb_suspend(dev);
679 /* FIXME: should suspend also ATV/DTV */
681 return 0;
684 static int au0828_resume(struct usb_interface *interface)
686 struct au0828_dev *dev = usb_get_intfdata(interface);
687 if (!dev)
688 return 0;
690 pr_info("Resume\n");
692 /* Power Up the bridge */
693 au0828_write(dev, REG_600, 1 << 4);
695 /* Bring up the GPIO's and supporting devices */
696 au0828_gpio_setup(dev);
698 au0828_rc_resume(dev);
699 au0828_v4l2_resume(dev);
700 au0828_dvb_resume(dev);
702 /* FIXME: should resume also ATV/DTV */
704 return 0;
707 static struct usb_driver au0828_usb_driver = {
708 .name = KBUILD_MODNAME,
709 .probe = au0828_usb_probe,
710 .disconnect = au0828_usb_disconnect,
711 .id_table = au0828_usb_id_table,
712 .suspend = au0828_suspend,
713 .resume = au0828_resume,
714 .reset_resume = au0828_resume,
717 static int __init au0828_init(void)
719 int ret;
721 if (au0828_debug & 1)
722 pr_info("%s() Debugging is enabled\n", __func__);
724 if (au0828_debug & 2)
725 pr_info("%s() USB Debugging is enabled\n", __func__);
727 if (au0828_debug & 4)
728 pr_info("%s() I2C Debugging is enabled\n", __func__);
730 if (au0828_debug & 8)
731 pr_info("%s() Bridge Debugging is enabled\n",
732 __func__);
734 if (au0828_debug & 16)
735 pr_info("%s() IR Debugging is enabled\n",
736 __func__);
738 pr_info("au0828 driver loaded\n");
740 ret = usb_register(&au0828_usb_driver);
741 if (ret)
742 pr_err("usb_register failed, error = %d\n", ret);
744 return ret;
747 static void __exit au0828_exit(void)
749 usb_deregister(&au0828_usb_driver);
752 module_init(au0828_init);
753 module_exit(au0828_exit);
755 MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");
756 MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
757 MODULE_LICENSE("GPL");
758 MODULE_VERSION("0.0.3");