[media] usbtv: add audio support

Add an ALSA handler inside usbtv module, in order to make
audio to work with those devices.

Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>
Tested-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/usb/usbtv/Makefile

 usbtv-y := usbtv-core.o \
-	usbtv-video.o
+	usbtv-video.o \
+	usbtv-audio.o
 
 obj-$(CONFIG_VIDEO_USBTV) += usbtv.o

drivers/media/usb/usbtv/usbtv-audio.c

+/*
+ * Fushicai USBTV007 Audio-Video Grabber Driver
+ *
+ * Product web site:
+ * http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html
+ *
+ * Copyright (c) 2013 Federico Simoncelli
+ * All rights reserved.
+ * No physical hardware was harmed running Windows during the
+ * reverse-engineering activity
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL").
+ */
+
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/ac97_codec.h>
+#include <sound/pcm_params.h>
+
+#include "usbtv.h"
+
+static struct snd_pcm_hardware snd_usbtv_digital_hw = {
+	.info = SNDRV_PCM_INFO_BATCH |
+		SNDRV_PCM_INFO_MMAP |
+		SNDRV_PCM_INFO_INTERLEAVED |
+		SNDRV_PCM_INFO_BLOCK_TRANSFER |
+		SNDRV_PCM_INFO_MMAP_VALID,
+	.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	.rates = SNDRV_PCM_RATE_48000,
+	.rate_min = 48000,
+	.rate_max = 48000,
+	.channels_min = 2,
+	.channels_max = 2,
+	.period_bytes_min = 11059,
+	.period_bytes_max = 13516,
+	.periods_min = 2,
+	.periods_max = 98,
+	.buffer_bytes_max = 62720 * 8, /* value in usbaudio.c */
+};
+
+static int snd_usbtv_pcm_open(struct snd_pcm_substream *substream)
+{
+	struct usbtv *chip = snd_pcm_substream_chip(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	chip->snd_substream = substream;
+	runtime->hw = snd_usbtv_digital_hw;
+
+	return 0;
+}
+
+static int snd_usbtv_pcm_close(struct snd_pcm_substream *substream)
+{
+	struct usbtv *chip = snd_pcm_substream_chip(substream);
+
+	if (atomic_read(&chip->snd_stream)) {
+		atomic_set(&chip->snd_stream, 0);
+		schedule_work(&chip->snd_trigger);
+	}
+
+	return 0;
+}
+
+static int snd_usbtv_hw_params(struct snd_pcm_substream *substream,
+		struct snd_pcm_hw_params *hw_params)
+{
+	int rv;
+	struct usbtv *chip = snd_pcm_substream_chip(substream);
+
+	rv = snd_pcm_lib_malloc_pages(substream,
+		params_buffer_bytes(hw_params));
+
+	if (rv < 0) {
+		dev_warn(chip->dev, "pcm audio buffer allocation failure %i\n",
+			rv);
+		return rv;
+	}
+
+	return 0;
+}
+
+static int snd_usbtv_hw_free(struct snd_pcm_substream *substream)
+{
+	snd_pcm_lib_free_pages(substream);
+	return 0;
+}
+
+static int snd_usbtv_prepare(struct snd_pcm_substream *substream)
+{
+	struct usbtv *chip = snd_pcm_substream_chip(substream);
+
+	chip->snd_buffer_pos = 0;
+	chip->snd_period_pos = 0;
+
+	return 0;
+}
+
+static void usbtv_audio_urb_received(struct urb *urb)
+{
+	struct usbtv *chip = urb->context;
+	struct snd_pcm_substream *substream = chip->snd_substream;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	size_t i, frame_bytes, chunk_length, buffer_pos, period_pos;
+	int period_elapsed;
+	void *urb_current;
+
+	switch (urb->status) {
+	case 0:
+	case -ETIMEDOUT:
+		break;
+	case -ENOENT:
+	case -EPROTO:
+	case -ECONNRESET:
+	case -ESHUTDOWN:
+		return;
+	default:
+		dev_warn(chip->dev, "unknown audio urb status %i\n",
+			urb->status);
+	}
+
+	if (!atomic_read(&chip->snd_stream))
+		return;
+
+	frame_bytes = runtime->frame_bits >> 3;
+	chunk_length = USBTV_CHUNK / frame_bytes;
+
+	buffer_pos = chip->snd_buffer_pos;
+	period_pos = chip->snd_period_pos;
+	period_elapsed = 0;
+
+	for (i = 0; i < urb->actual_length; i += USBTV_CHUNK_SIZE) {
+		urb_current = urb->transfer_buffer + i + USBTV_AUDIO_HDRSIZE;
+
+		if (buffer_pos + chunk_length >= runtime->buffer_size) {
+			size_t cnt = (runtime->buffer_size - buffer_pos) *
+				frame_bytes;
+			memcpy(runtime->dma_area + buffer_pos * frame_bytes,
+				urb_current, cnt);
+			memcpy(runtime->dma_area, urb_current + cnt,
+				chunk_length * frame_bytes - cnt);
+		} else {
+			memcpy(runtime->dma_area + buffer_pos * frame_bytes,
+				urb_current, chunk_length * frame_bytes);
+		}
+
+		buffer_pos += chunk_length;
+		period_pos += chunk_length;
+
+		if (buffer_pos >= runtime->buffer_size)
+			buffer_pos -= runtime->buffer_size;
+
+		if (period_pos >= runtime->period_size) {
+			period_pos -= runtime->period_size;
+			period_elapsed = 1;
+		}
+	}
+
+	snd_pcm_stream_lock(substream);
+
+	chip->snd_buffer_pos = buffer_pos;
+	chip->snd_period_pos = period_pos;
+
+	snd_pcm_stream_unlock(substream);
+
+	if (period_elapsed)
+		snd_pcm_period_elapsed(substream);
+
+	usb_submit_urb(urb, GFP_ATOMIC);
+}
+
+static int usbtv_audio_start(struct usbtv *chip)
+{
+	unsigned int pipe;
+	static const u16 setup[][2] = {
+		/* These seem to enable the device. */
+		{ USBTV_BASE + 0x0008, 0x0001 },
+		{ USBTV_BASE + 0x01d0, 0x00ff },
+		{ USBTV_BASE + 0x01d9, 0x0002 },
+
+		{ USBTV_BASE + 0x01da, 0x0013 },
+		{ USBTV_BASE + 0x01db, 0x0012 },
+		{ USBTV_BASE + 0x01e9, 0x0002 },
+		{ USBTV_BASE + 0x01ec, 0x006c },
+		{ USBTV_BASE + 0x0294, 0x0020 },
+		{ USBTV_BASE + 0x0255, 0x00cf },
+		{ USBTV_BASE + 0x0256, 0x0020 },
+		{ USBTV_BASE + 0x01eb, 0x0030 },
+		{ USBTV_BASE + 0x027d, 0x00a6 },
+		{ USBTV_BASE + 0x0280, 0x0011 },
+		{ USBTV_BASE + 0x0281, 0x0040 },
+		{ USBTV_BASE + 0x0282, 0x0011 },
+		{ USBTV_BASE + 0x0283, 0x0040 },
+		{ 0xf891, 0x0010 },
+
+		/* this sets the input from composite */
+		{ USBTV_BASE + 0x0284, 0x00aa },
+	};
+
+	chip->snd_bulk_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (chip->snd_bulk_urb == NULL)
+		goto err_alloc_urb;
+
+	pipe = usb_rcvbulkpipe(chip->udev, USBTV_AUDIO_ENDP);
+
+	chip->snd_bulk_urb->transfer_buffer = kzalloc(
+		USBTV_AUDIO_URBSIZE, GFP_KERNEL);
+	if (chip->snd_bulk_urb->transfer_buffer == NULL)
+		goto err_transfer_buffer;
+
+	usb_fill_bulk_urb(chip->snd_bulk_urb, chip->udev, pipe,
+		chip->snd_bulk_urb->transfer_buffer, USBTV_AUDIO_URBSIZE,
+		usbtv_audio_urb_received, chip);
+
+	/* starting the stream */
+	usbtv_set_regs(chip, setup, ARRAY_SIZE(setup));
+
+	usb_clear_halt(chip->udev, pipe);
+	usb_submit_urb(chip->snd_bulk_urb, GFP_ATOMIC);
+
+	return 0;
+
+err_transfer_buffer:
+	usb_free_urb(chip->snd_bulk_urb);
+	chip->snd_bulk_urb = NULL;
+
+err_alloc_urb:
+	return -ENOMEM;
+}
+
+static int usbtv_audio_stop(struct usbtv *chip)
+{
+	static const u16 setup[][2] = {
+	/* The original windows driver sometimes sends also:
+	 *   { USBTV_BASE + 0x00a2, 0x0013 }
+	 * but it seems useless and its real effects are untested at
+	 * the moment.
+	 */
+		{ USBTV_BASE + 0x027d, 0x0000 },
+		{ USBTV_BASE + 0x0280, 0x0010 },
+		{ USBTV_BASE + 0x0282, 0x0010 },
+	};
+
+	if (chip->snd_bulk_urb) {
+		usb_kill_urb(chip->snd_bulk_urb);
+		kfree(chip->snd_bulk_urb->transfer_buffer);
+		usb_free_urb(chip->snd_bulk_urb);
+		chip->snd_bulk_urb = NULL;
+	}
+
+	usbtv_set_regs(chip, setup, ARRAY_SIZE(setup));
+
+	return 0;
+}
+
+void usbtv_audio_suspend(struct usbtv *usbtv)
+{
+	if (atomic_read(&usbtv->snd_stream) && usbtv->snd_bulk_urb)
+		usb_kill_urb(usbtv->snd_bulk_urb);
+}
+
+void usbtv_audio_resume(struct usbtv *usbtv)
+{
+	if (atomic_read(&usbtv->snd_stream) && usbtv->snd_bulk_urb)
+		usb_submit_urb(usbtv->snd_bulk_urb, GFP_ATOMIC);
+}
+
+static void snd_usbtv_trigger(struct work_struct *work)
+{
+	struct usbtv *chip = container_of(work, struct usbtv, snd_trigger);
+
+	if (atomic_read(&chip->snd_stream))
+		usbtv_audio_start(chip);
+	else
+		usbtv_audio_stop(chip);
+}
+
+static int snd_usbtv_card_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct usbtv *chip = snd_pcm_substream_chip(substream);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		atomic_set(&chip->snd_stream, 1);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		atomic_set(&chip->snd_stream, 0);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	schedule_work(&chip->snd_trigger);
+
+	return 0;
+}
+
+static snd_pcm_uframes_t snd_usbtv_pointer(struct snd_pcm_substream *substream)
+{
+	struct usbtv *chip = snd_pcm_substream_chip(substream);
+	return chip->snd_buffer_pos;
+}
+
+static struct snd_pcm_ops snd_usbtv_pcm_ops = {
+	.open = snd_usbtv_pcm_open,
+	.close = snd_usbtv_pcm_close,
+	.ioctl = snd_pcm_lib_ioctl,
+	.hw_params = snd_usbtv_hw_params,
+	.hw_free = snd_usbtv_hw_free,
+	.prepare = snd_usbtv_prepare,
+	.trigger = snd_usbtv_card_trigger,
+	.pointer = snd_usbtv_pointer,
+};
+
+int usbtv_audio_init(struct usbtv *usbtv)
+{
+	int rv;
+	struct snd_card *card;
+	struct snd_pcm *pcm;
+
+	INIT_WORK(&usbtv->snd_trigger, snd_usbtv_trigger);
+	atomic_set(&usbtv->snd_stream, 0);
+
+	rv = snd_card_new(&usbtv->udev->dev, SNDRV_DEFAULT_IDX1, "usbtv",
+		THIS_MODULE, 0, &card);
+	if (rv < 0)
+		return rv;
+
+	strlcpy(card->driver, usbtv->dev->driver->name, sizeof(card->driver));
+	strlcpy(card->shortname, "usbtv", sizeof(card->shortname));
+	snprintf(card->longname, sizeof(card->longname),
+		"USBTV Audio at bus %d device %d", usbtv->udev->bus->busnum,
+		usbtv->udev->devnum);
+
+	snd_card_set_dev(card, usbtv->dev);
+
+	usbtv->snd = card;
+
+	rv = snd_pcm_new(card, "USBTV Audio", 0, 0, 1, &pcm);
+	if (rv < 0)
+		goto err;
+
+	strlcpy(pcm->name, "USBTV Audio Input", sizeof(pcm->name));
+	pcm->info_flags = 0;
+	pcm->private_data = usbtv;
+
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_usbtv_pcm_ops);
+	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
+		snd_dma_continuous_data(GFP_KERNEL), USBTV_AUDIO_BUFFER,
+		USBTV_AUDIO_BUFFER);
+
+	rv = snd_card_register(card);
+	if (rv)
+		goto err;
+
+	return 0;
+
+err:
+	usbtv->snd = NULL;
+	snd_card_free(card);
+
+	return rv;
+}
+
+void usbtv_audio_free(struct usbtv *usbtv)
+{
+	if (usbtv->snd && usbtv->udev) {
+		snd_card_free(usbtv->snd);
+		usbtv->snd = NULL;
+	}
+}

drivers/media/usb/usbtv/usbtv-core.c

 /*
- * Fushicai USBTV007 Video Grabber Driver
+ * Fushicai USBTV007 Audio-Video Grabber Driver
  *
  * Product web site:
  * http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html
@@ -84,12 +84,19 @@ static int usbtv_probe(struct usb_interface *intf,
 	if (ret < 0)
 		goto usbtv_video_fail;
 
+	ret = usbtv_audio_init(usbtv);
+	if (ret < 0)
+		goto usbtv_audio_fail;
+
 	/* for simplicity we exploit the v4l2_device reference counting */
 	v4l2_device_get(&usbtv->v4l2_dev);
 
-	dev_info(dev, "Fushicai USBTV007 Video Grabber\n");
+	dev_info(dev, "Fushicai USBTV007 Audio-Video Grabber\n");
 	return 0;
 
+usbtv_audio_fail:
+	usbtv_video_free(usbtv);
+
 usbtv_video_fail:
 	usb_set_intfdata(intf, NULL);
 	usb_put_dev(usbtv->udev);
@@ -106,6 +113,7 @@ static void usbtv_disconnect(struct usb_interface *intf)
 	if (!usbtv)
 		return;
 
+	usbtv_audio_free(usbtv);
 	usbtv_video_free(usbtv);
 
 	usb_put_dev(usbtv->udev);
@@ -122,8 +130,8 @@ static struct usb_device_id usbtv_id_table[] = {
 };
 MODULE_DEVICE_TABLE(usb, usbtv_id_table);
 
-MODULE_AUTHOR("Lubomir Rintel");
-MODULE_DESCRIPTION("Fushicai USBTV007 Video Grabber Driver");
+MODULE_AUTHOR("Lubomir Rintel, Federico Simoncelli");
+MODULE_DESCRIPTION("Fushicai USBTV007 Audio-Video Grabber Driver");
 MODULE_LICENSE("Dual BSD/GPL");
 
 static struct usb_driver usbtv_usb_driver = {

drivers/media/usb/usbtv/usbtv-video.c

 /*
- * Fushicai USBTV007 Video Grabber Driver
+ * Fushicai USBTV007 Audio-Video Grabber Driver
  *
  * Product web site:
  * http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html
@@ -79,7 +79,6 @@ static int usbtv_select_input(struct usbtv *usbtv, int input)
 		{ USBTV_BASE + 0x011f, 0x00f2 },
 		{ USBTV_BASE + 0x0127, 0x0060 },
 		{ USBTV_BASE + 0x00ae, 0x0010 },
-		{ USBTV_BASE + 0x0284, 0x00aa },
 		{ USBTV_BASE + 0x0239, 0x0060 },
 	};
 
@@ -88,7 +87,6 @@ static int usbtv_select_input(struct usbtv *usbtv, int input)
 		{ USBTV_BASE + 0x011f, 0x00ff },
 		{ USBTV_BASE + 0x0127, 0x0060 },
 		{ USBTV_BASE + 0x00ae, 0x0030 },
-		{ USBTV_BASE + 0x0284, 0x0088 },
 		{ USBTV_BASE + 0x0239, 0x0060 },
 	};
 
@@ -225,7 +223,6 @@ static int usbtv_setup_capture(struct usbtv *usbtv)
 		{ USBTV_BASE + 0x0159, 0x0006 },
 		{ USBTV_BASE + 0x015d, 0x0000 },
 
-		{ USBTV_BASE + 0x0284, 0x0088 },
 		{ USBTV_BASE + 0x0003, 0x0004 },
 		{ USBTV_BASE + 0x0100, 0x00d3 },
 		{ USBTV_BASE + 0x0115, 0x0015 },
@@ -434,6 +431,8 @@ static int usbtv_start(struct usbtv *usbtv)
 	int i;
 	int ret;
 
+	usbtv_audio_suspend(usbtv);
+
 	ret = usb_set_interface(usbtv->udev, 0, 0);
 	if (ret < 0)
 		return ret;
@@ -446,6 +445,8 @@ static int usbtv_start(struct usbtv *usbtv)
 	if (ret < 0)
 		return ret;
 
+	usbtv_audio_resume(usbtv);
+
 	for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) {
 		struct urb *ip;
 

drivers/media/usb/usbtv/usbtv.h

 /*
- * Fushicai USBTV007 Video Grabber Driver
+ * Fushicai USBTV007 Audio-Video Grabber Driver
  *
  * Copyright (c) 2013 Lubomir Rintel
  * All rights reserved.
@@ -28,6 +28,7 @@
 
 /* Hardware. */
 #define USBTV_VIDEO_ENDP	0x81
+#define USBTV_AUDIO_ENDP	0x83
 #define USBTV_BASE		0xc000
 #define USBTV_REQUEST_REG	12
 
@@ -39,6 +40,10 @@
 #define USBTV_CHUNK_SIZE	256
 #define USBTV_CHUNK		240
 
+#define USBTV_AUDIO_URBSIZE	20480
+#define USBTV_AUDIO_HDRSIZE	4
+#define USBTV_AUDIO_BUFFER	65536
+
 /* Chunk header. */
 #define USBTV_MAGIC_OK(chunk)	((be32_to_cpu(chunk[0]) & 0xff000000) \
 							== 0x88000000)
@@ -91,9 +96,23 @@ struct usbtv {
 	int iso_size;
 	unsigned int sequence;
 	struct urb *isoc_urbs[USBTV_ISOC_TRANSFERS];
+
+	/* audio */
+	struct snd_card *snd;
+	struct snd_pcm_substream *snd_substream;
+	atomic_t snd_stream;
+	struct work_struct snd_trigger;
+	struct urb *snd_bulk_urb;
+	size_t snd_buffer_pos;
+	size_t snd_period_pos;
 };
 
 int usbtv_set_regs(struct usbtv *usbtv, const u16 regs[][2], int size);
 
 int usbtv_video_init(struct usbtv *usbtv);
 void usbtv_video_free(struct usbtv *usbtv);
+
+int usbtv_audio_init(struct usbtv *usbtv);
+void usbtv_audio_free(struct usbtv *usbtv);
+void usbtv_audio_suspend(struct usbtv *usbtv);
+void usbtv_audio_resume(struct usbtv *usbtv);