[media] em28xx: Add support for devices with a separate audio interface (4f83e7b3) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/media/video/em28xx/em28xx-audio.c

+24 −20

Original line number	Diff line number	Diff line
		@@ -3,9 +3,9 @@
		*
		* Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
		*
		* Copyright (C) 2007 Mauro Carvalho Chehab <mchehab@infradead.org>
		* Copyright (C) 2007-2011 Mauro Carvalho Chehab <mchehab@redhat.com>
		* - Port to work with the in-kernel driver
		* - Several cleanups
		* - Cleanups, fixes, alsa-controls, etc.
		*
		* This driver is based on my previous au600 usb pstn audio driver
		* and inherits all the copyrights
		@@ -281,23 +281,27 @@ static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
		return -ENODEV;
		}

		/* Sets volume, mute, etc */
		runtime->hw = snd_em28xx_hw_capture;
		if ((dev->alt == 0 \|\| dev->audio_ifnum) && dev->adev.users == 0) {
		if (dev->audio_ifnum)
		dev->alt = 1;
		else
		dev->alt = 7;

		dprintk("changing alternate number on interface %d to %d\n",
		dev->audio_ifnum, dev->alt);
		usb_set_interface(dev->udev, dev->audio_ifnum, dev->alt);

		/* Sets volume, mute, etc */
		dev->mute = 0;
		mutex_lock(&dev->lock);
		ret = em28xx_audio_analog_set(dev);
		if (ret < 0)
		goto err;

		runtime->hw = snd_em28xx_hw_capture;
		if (dev->alt == 0 && dev->adev.users == 0) {
		dev->alt = 7;
		dprintk("changing alternate number to 7\n");
		usb_set_interface(dev->udev, 0, 7);
		}

		dev->adev.users++;
		mutex_unlock(&dev->lock);
		}

		snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
		dev->adev.capture_pcm_substream = substream;
		@@ -635,17 +639,17 @@ static int em28xx_audio_init(struct em28xx *dev)
		static int devnr;
		int err;

		if (dev->has_alsa_audio != 1) {
		if (!dev->has_alsa_audio \|\| dev->audio_ifnum < 0) {
		/* This device does not support the extension (in this case
		the device is expecting the snd-usb-audio module or
		doesn't have analog audio support at all) */
		return 0;
		}

		printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
		"non standard usbaudio\n");
		printk(KERN_INFO "em28xx-audio.c: probing for em28xx Audio Vendor Class\n");
		printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
		"Rechberger\n");
		printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2007-2011 Mauro Carvalho Chehab\n");

		err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
		&card);
		@@ -737,7 +741,7 @@ static void __exit em28xx_alsa_unregister(void)

		MODULE_LICENSE("GPL");
		MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
		MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
		MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
		MODULE_DESCRIPTION("Em28xx Audio driver");

		module_init(em28xx_alsa_register);

drivers/media/video/em28xx/em28xx-cards.c

+74 −28

Original line number	Diff line number	Diff line
		@@ -2846,6 +2846,16 @@ static int em28xx_init_dev(struct em28xx *devhandle, struct usb_device udev,
		}
		}

		if (dev->is_audio_only) {
		errCode = em28xx_audio_setup(dev);
		if (errCode)
		return -ENODEV;
		em28xx_add_into_devlist(dev);
		em28xx_init_extension(dev);

		return 0;
		}

		/* Prepopulate cached GPO register content */
		retval = em28xx_read_reg(dev, dev->reg_gpo_num);
		if (retval >= 0)
		@@ -2946,6 +2956,9 @@ static int em28xx_init_dev(struct em28xx *devhandle, struct usb_device udev,
		return retval;
		}

		/* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
		#define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))

		/*
		* em28xx_usb_probe()
		* checks for supported devices
		@@ -2955,15 +2968,15 @@ static int em28xx_usb_probe(struct usb_interface *interface,
		{
		const struct usb_endpoint_descriptor *endpoint;
		struct usb_device *udev;
		struct usb_interface *uif;
		struct em28xx *dev = NULL;
		int retval;
		int i, nr, ifnum, isoc_pipe;
		bool is_audio_only = false, has_audio = false;
		int i, nr, isoc_pipe;
		const int ifnum = interface->altsetting[0].desc.bInterfaceNumber;
		char *speed;
		char descr[255] = "";

		udev = usb_get_dev(interface_to_usbdev(interface));
		ifnum = interface->altsetting[0].desc.bInterfaceNumber;

		/* Check to see next free device and mark as used */
		nr = find_first_zero_bit(&em28xx_devused, EM28XX_MAXBOARDS);
		@@ -2983,6 +2996,19 @@ static int em28xx_usb_probe(struct usb_interface *interface,
		goto err;
		}

		/* Get endpoints */
		for (i = 0; i < interface->num_altsetting; i++) {
		int ep;

		for (ep = 0; ep < interface->altsetting[i].desc.bNumEndpoints; ep++) {
		struct usb_host_endpoint *e;
		e = &interface->altsetting[i].endpoint[ep];

		if (e->desc.bEndpointAddress == 0x83)
		has_audio = true;
		}
		}

		endpoint = &interface->cur_altsetting->endpoint[0].desc;

		/* check if the device has the iso in endpoint at the correct place */
		@@ -3002,13 +3028,15 @@ static int em28xx_usb_probe(struct usb_interface *interface,
		check_interface = 0;

		if (!check_interface) {
		if (has_audio) {
		is_audio_only = true;
		} else {
		em28xx_err(DRIVER_NAME " video device (%04x:%04x): "
		"interface %i, class %i found.\n",
		le16_to_cpu(udev->descriptor.idVendor),
		le16_to_cpu(udev->descriptor.idProduct),
		ifnum,
		interface->altsetting[0].desc.bInterfaceClass);

		em28xx_err(DRIVER_NAME " This is an anciliary "
		"interface not used by the driver\n");

		@@ -3017,6 +3045,7 @@ static int em28xx_usb_probe(struct usb_interface *interface,
		goto err;
		}
		}
		}

		switch (udev->speed) {
		case USB_SPEED_LOW:
		@@ -3044,8 +3073,8 @@ static int em28xx_usb_probe(struct usb_interface *interface,
		if (*descr)
		strlcat(descr, " ", sizeof(descr));

		printk(DRIVER_NAME ": New device %s@ %s Mbps "
		"(%04x:%04x, interface %d, class %d)\n",
		printk(KERN_INFO DRIVER_NAME
		": New device %s@ %s Mbps (%04x:%04x, interface %d, class %d)\n",
		descr,
		speed,
		le16_to_cpu(udev->descriptor.idVendor),
		@@ -3053,6 +3082,11 @@ static int em28xx_usb_probe(struct usb_interface *interface,
		ifnum,
		interface->altsetting->desc.bInterfaceNumber);

		if (has_audio)
		printk(KERN_INFO DRIVER_NAME
		": Audio Vendor Class interface %i found\n",
		ifnum);

		/*
		* Make sure we have 480 Mbps of bandwidth, otherwise things like
		* video stream wouldn't likely work, since 12 Mbps is generally
		@@ -3088,10 +3122,13 @@ static int em28xx_usb_probe(struct usb_interface *interface,
		dev->devno = nr;
		dev->model = id->driver_info;
		dev->alt = -1;
		dev->is_audio_only = is_audio_only;
		dev->has_alsa_audio = has_audio;
		dev->audio_ifnum = ifnum;

		/* Checks if audio is provided by some interface */
		for (i = 0; i < udev->config->desc.bNumInterfaces; i++) {
		uif = udev->config->interface[i];
		struct usb_interface *uif = udev->config->interface[i];
		if (uif->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
		dev->has_audio_class = 1;
		break;
		@@ -3099,9 +3136,7 @@ static int em28xx_usb_probe(struct usb_interface *interface,
		}

		/* compute alternate max packet sizes */
		uif = udev->actconfig->interface[0];

		dev->num_alt = uif->num_altsetting;
		dev->num_alt = interface->num_altsetting;
		dev->alt_max_pkt_size = kmalloc(32 * dev->num_alt, GFP_KERNEL);

		if (dev->alt_max_pkt_size == NULL) {
		@@ -3113,14 +3148,21 @@ static int em28xx_usb_probe(struct usb_interface *interface,
		}

		for (i = 0; i < dev->num_alt ; i++) {
		u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.wMaxPacketSize);
		dev->alt_max_pkt_size[i] =
		(tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
		u16 tmp = le16_to_cpu(interface->altsetting[i].endpoint[isoc_pipe].desc.wMaxPacketSize);
		unsigned int size = tmp & 0x7ff;

		if (udev->speed == USB_SPEED_HIGH)
		size = size * hb_mult(tmp);

		dev->alt_max_pkt_size[i] = size;
		}

		if ((card[nr] >= 0) && (card[nr] < em28xx_bcount))
		dev->model = card[nr];

		/* save our data pointer in this interface device */
		usb_set_intfdata(interface, dev);

		/* allocate device struct */
		mutex_init(&dev->lock);
		mutex_lock(&dev->lock);
		@@ -3132,9 +3174,6 @@ static int em28xx_usb_probe(struct usb_interface *interface,
		goto err;
		}

		/* save our data pointer in this interface device */
		usb_set_intfdata(interface, dev);

		request_modules(dev);

		/* Should be the last thing to do, to avoid newer udev's to
		@@ -3163,6 +3202,13 @@ static void em28xx_usb_disconnect(struct usb_interface *interface)
		if (!dev)
		return;

		if (dev->is_audio_only) {
		mutex_lock(&dev->lock);
		em28xx_close_extension(dev);
		mutex_unlock(&dev->lock);
		return;
		}

		em28xx_info("disconnecting %s\n", dev->vdev->name);

		flush_request_modules(dev);

drivers/media/video/em28xx/em28xx-core.c

+8 −12

Original line number	Diff line number	Diff line
		@@ -499,17 +499,13 @@ int em28xx_audio_setup(struct em28xx *dev)
		if (dev->chip_id == CHIP_ID_EM2870 \|\| dev->chip_id == CHIP_ID_EM2874
		\|\| dev->chip_id == CHIP_ID_EM28174) {
		/* Digital only device - don't load any alsa module */
		dev->audio_mode.has_audio = 0;
		dev->has_audio_class = 0;
		dev->has_alsa_audio = 0;
		dev->audio_mode.has_audio = false;
		dev->has_audio_class = false;
		dev->has_alsa_audio = false;
		return 0;
		}

		/* If device doesn't support Usb Audio Class, use vendor class */
		if (!dev->has_audio_class)
		dev->has_alsa_audio = 1;

		dev->audio_mode.has_audio = 1;
		dev->audio_mode.has_audio = true;

		/* See how this device is configured */
		cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
		@@ -519,8 +515,8 @@ int em28xx_audio_setup(struct em28xx *dev)
		cfg = EM28XX_CHIPCFG_AC97; /* Be conservative */
		} else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) == 0x00) {
		/* The device doesn't have vendor audio at all */
		dev->has_alsa_audio = 0;
		dev->audio_mode.has_audio = 0;
		dev->has_alsa_audio = false;
		dev->audio_mode.has_audio = false;
		return 0;
		} else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
		EM28XX_CHIPCFG_I2S_3_SAMPRATES) {
		@@ -549,8 +545,8 @@ int em28xx_audio_setup(struct em28xx *dev)
		*/
		em28xx_warn("AC97 chip type couldn't be determined\n");
		dev->audio_mode.ac97 = EM28XX_NO_AC97;
		dev->has_alsa_audio = 0;
		dev->audio_mode.has_audio = 0;
		dev->has_alsa_audio = false;
		dev->audio_mode.has_audio = false;
		goto init_audio;
		}

drivers/media/video/em28xx/em28xx.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -487,6 +487,8 @@ struct em28xx {
		int devno; /* marks the number of this device */
		enum em28xx_chip_id chip_id;

		int audio_ifnum;

		struct v4l2_device v4l2_dev;
		struct em28xx_board board;

		@@ -503,6 +505,7 @@ struct em28xx {

		unsigned int has_audio_class:1;
		unsigned int has_alsa_audio:1;
		unsigned int is_audio_only:1;

		/* Controls audio streaming */
		struct work_struct wq_trigger; /* Trigger to start/stop audio for alsa module */