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Diffstat (limited to 'drivers/media/video/em28xx/em28xx-audio.c')
-rw-r--r--drivers/media/video/em28xx/em28xx-audio.c489
1 files changed, 489 insertions, 0 deletions
diff --git a/drivers/media/video/em28xx/em28xx-audio.c b/drivers/media/video/em28xx/em28xx-audio.c
new file mode 100644
index 000000000000..941357c4f3f5
--- /dev/null
+++ b/drivers/media/video/em28xx/em28xx-audio.c
@@ -0,0 +1,489 @@
+/*
+ * Empiatech em28x1 audio extension
+ *
+ * Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
+ *
+ * Copyright (C) 2007 Mauro Carvalho Chehab <mchehab@infradead.org>
+ * - Port to work with the in-kernel driver
+ * - Several cleanups
+ *
+ * This driver is based on my previous au600 usb pstn audio driver
+ * and inherits all the copyrights
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/usb.h>
+#include <linux/init.h>
+#include <linux/sound.h>
+#include <linux/spinlock.h>
+#include <linux/soundcard.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/proc_fs.h>
+#include <linux/module.h>
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/info.h>
+#include <sound/initval.h>
+#include <sound/control.h>
+#include <media/v4l2-common.h>
+#include "em28xx.h"
+
+static int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "activates debug info");
+
+#define dprintk(fmt, arg...) do { \
+ if (debug) \
+ printk(KERN_INFO "em28xx-audio %s: " fmt, \
+ __FUNCTION__, ##arg); \
+ } while (0)
+
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
+
+static int em28xx_isoc_audio_deinit(struct em28xx *dev)
+{
+ int i;
+
+ dprintk("Stopping isoc\n");
+ for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
+ usb_kill_urb(dev->adev->urb[i]);
+ usb_free_urb(dev->adev->urb[i]);
+ dev->adev->urb[i] = NULL;
+ }
+
+ return 0;
+}
+
+static void em28xx_audio_isocirq(struct urb *urb)
+{
+ struct em28xx *dev = urb->context;
+ int i;
+ unsigned int oldptr;
+ unsigned long flags;
+ int period_elapsed = 0;
+ int status;
+ unsigned char *cp;
+ unsigned int stride;
+ struct snd_pcm_substream *substream;
+ struct snd_pcm_runtime *runtime;
+ if (dev->adev->capture_pcm_substream) {
+ substream = dev->adev->capture_pcm_substream;
+ runtime = substream->runtime;
+ stride = runtime->frame_bits >> 3;
+
+ for (i = 0; i < urb->number_of_packets; i++) {
+ int length =
+ urb->iso_frame_desc[i].actual_length / stride;
+ cp = (unsigned char *)urb->transfer_buffer +
+ urb->iso_frame_desc[i].offset;
+
+ if (!length)
+ continue;
+
+ spin_lock_irqsave(&dev->adev->slock, flags);
+
+ oldptr = dev->adev->hwptr_done_capture;
+ dev->adev->hwptr_done_capture += length;
+ if (dev->adev->hwptr_done_capture >=
+ runtime->buffer_size)
+ dev->adev->hwptr_done_capture -=
+ runtime->buffer_size;
+
+ dev->adev->capture_transfer_done += length;
+ if (dev->adev->capture_transfer_done >=
+ runtime->period_size) {
+ dev->adev->capture_transfer_done -=
+ runtime->period_size;
+ period_elapsed = 1;
+ }
+
+ spin_unlock_irqrestore(&dev->adev->slock, flags);
+
+ if (oldptr + length >= runtime->buffer_size) {
+ unsigned int cnt =
+ runtime->buffer_size - oldptr - 1;
+ memcpy(runtime->dma_area + oldptr * stride, cp,
+ cnt * stride);
+ memcpy(runtime->dma_area, cp + cnt,
+ length * stride - cnt * stride);
+ } else {
+ memcpy(runtime->dma_area + oldptr * stride, cp,
+ length * stride);
+ }
+ }
+ if (period_elapsed)
+ snd_pcm_period_elapsed(substream);
+ }
+ urb->status = 0;
+
+ if (dev->adev->shutdown)
+ return;
+
+ status = usb_submit_urb(urb, GFP_ATOMIC);
+ if (status < 0) {
+ em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
+ status);
+ }
+ return;
+}
+
+static int em28xx_init_audio_isoc(struct em28xx *dev)
+{
+ int i, errCode;
+ const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
+ EM28XX_AUDIO_MAX_PACKET_SIZE;
+
+ dprintk("Starting isoc transfers\n");
+
+ for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
+ struct urb *urb;
+ int j, k;
+
+ dev->adev->transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
+ if (!dev->adev->transfer_buffer[i])
+ return -ENOMEM;
+
+ memset(dev->adev->transfer_buffer[i], 0x80, sb_size);
+ urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
+ if (!urb)
+ return -ENOMEM;
+
+ urb->dev = dev->udev;
+ urb->context = dev;
+ urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
+ urb->transfer_flags = URB_ISO_ASAP;
+ urb->transfer_buffer = dev->adev->transfer_buffer[i];
+ urb->interval = 1;
+ urb->complete = em28xx_audio_isocirq;
+ urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
+ urb->transfer_buffer_length = sb_size;
+
+ for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
+ j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
+ urb->iso_frame_desc[j].offset = k;
+ urb->iso_frame_desc[j].length =
+ EM28XX_AUDIO_MAX_PACKET_SIZE;
+ }
+ dev->adev->urb[i] = urb;
+ }
+
+ for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
+ errCode = usb_submit_urb(dev->adev->urb[i], GFP_ATOMIC);
+ if (errCode) {
+ em28xx_isoc_audio_deinit(dev);
+
+ return errCode;
+ }
+ }
+
+ return 0;
+}
+
+static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
+{
+ dprintk("%s transfer\n", (dev->adev->capture_stream == STREAM_ON)?
+ "stop" : "start");
+
+ switch (cmd) {
+ case EM28XX_CAPTURE_STREAM_EN:
+ if (dev->adev->capture_stream == STREAM_OFF && arg == 1) {
+ dev->adev->capture_stream = STREAM_ON;
+ em28xx_init_audio_isoc(dev);
+ } else if (dev->adev->capture_stream == STREAM_ON && arg == 0) {
+ dev->adev->capture_stream = STREAM_OFF;
+ em28xx_isoc_audio_deinit(dev);
+ } else {
+ printk(KERN_ERR "An underrun very likely occurred. "
+ "Ignoring it.\n");
+ }
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
+ size_t size)
+{
+ struct snd_pcm_runtime *runtime = subs->runtime;
+
+ dprintk("Alocating vbuffer\n");
+ if (runtime->dma_area) {
+ if (runtime->dma_bytes > size)
+ return 0;
+
+ vfree(runtime->dma_area);
+ }
+ runtime->dma_area = vmalloc(size);
+ if (!runtime->dma_area)
+ return -ENOMEM;
+
+ runtime->dma_bytes = size;
+
+ return 0;
+}
+
+static struct snd_pcm_hardware snd_em28xx_hw_capture = {
+ .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
+ SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_MMAP_VALID,
+
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+
+ .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
+
+ .rate_min = 48000,
+ .rate_max = 48000,
+ .channels_min = 2,
+ .channels_max = 2,
+ .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
+ .period_bytes_min = 64, /* 12544/2, */
+ .period_bytes_max = 12544,
+ .periods_min = 2,
+ .periods_max = 98, /* 12544, */
+};
+
+static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
+{
+ struct em28xx *dev = snd_pcm_substream_chip(substream);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int ret = 0;
+
+ dprintk("opening device and trying to acquire exclusive lock\n");
+
+ /* Sets volume, mute, etc */
+ dev->mute = 0;
+ 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) {
+ int errCode;
+ dev->alt = 7;
+ errCode = usb_set_interface(dev->udev, 0, 7);
+ dprintk("changing alternate number to 7\n");
+ }
+
+ dev->adev->users++;
+
+ snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
+ dev->adev->capture_pcm_substream = substream;
+ runtime->private_data = dev;
+
+ return 0;
+err:
+ printk(KERN_ERR "Error while configuring em28xx mixer\n");
+ return ret;
+}
+
+static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
+{
+ struct em28xx *dev = snd_pcm_substream_chip(substream);
+ dev->adev->users--;
+
+ dprintk("closing device\n");
+
+ dev->mute = 1;
+ em28xx_audio_analog_set(dev);
+
+ if (dev->adev->users == 0 && dev->adev->shutdown == 1) {
+ dprintk("audio users: %d\n", dev->adev->users);
+ dprintk("disabling audio stream!\n");
+ dev->adev->shutdown = 0;
+ dprintk("released lock\n");
+ em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
+ }
+ return 0;
+}
+
+static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ unsigned int channels, rate, format;
+ int ret;
+
+ dprintk("Setting capture parameters\n");
+
+ ret = snd_pcm_alloc_vmalloc_buffer(substream,
+ params_buffer_bytes(hw_params));
+ format = params_format(hw_params);
+ rate = params_rate(hw_params);
+ channels = params_channels(hw_params);
+
+ /* TODO: set up em28xx audio chip to deliver the correct audio format,
+ current default is 48000hz multiplexed => 96000hz mono
+ which shouldn't matter since analogue TV only supports mono */
+ return 0;
+}
+
+static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
+{
+ struct em28xx *dev = snd_pcm_substream_chip(substream);
+
+ dprintk("Stop capture, if needed\n");
+
+ if (dev->adev->capture_stream == STREAM_ON)
+ em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
+
+ return 0;
+}
+
+static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
+{
+ return 0;
+}
+
+static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
+ int cmd)
+{
+ struct em28xx *dev = snd_pcm_substream_chip(substream);
+
+ dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
+ "start": "stop");
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
+ return 0;
+ case SNDRV_PCM_TRIGGER_STOP:
+ dev->adev->shutdown = 1;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
+ *substream)
+{
+ struct em28xx *dev;
+
+ snd_pcm_uframes_t hwptr_done;
+ dev = snd_pcm_substream_chip(substream);
+ hwptr_done = dev->adev->hwptr_done_capture;
+
+ return hwptr_done;
+}
+
+static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
+ unsigned long offset)
+{
+ void *pageptr = subs->runtime->dma_area + offset;
+
+ return vmalloc_to_page(pageptr);
+}
+
+static struct snd_pcm_ops snd_em28xx_pcm_capture = {
+ .open = snd_em28xx_capture_open,
+ .close = snd_em28xx_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = snd_em28xx_hw_capture_params,
+ .hw_free = snd_em28xx_hw_capture_free,
+ .prepare = snd_em28xx_prepare,
+ .trigger = snd_em28xx_capture_trigger,
+ .pointer = snd_em28xx_capture_pointer,
+ .page = snd_pcm_get_vmalloc_page,
+};
+
+static int em28xx_audio_init(struct em28xx *dev)
+{
+ struct em28xx_audio *adev;
+ struct snd_pcm *pcm;
+ struct snd_card *card;
+ static int devnr;
+ int ret, err;
+
+ printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
+ "non standard usbaudio\n");
+ printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
+ "Rechberger\n");
+
+ adev = kzalloc(sizeof(*adev), GFP_KERNEL);
+ if (!adev) {
+ printk(KERN_ERR "em28xx-audio.c: out of memory\n");
+ return -1;
+ }
+ card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE, 0);
+ if (card == NULL) {
+ kfree(adev);
+ return -ENOMEM;
+ }
+
+ spin_lock_init(&adev->slock);
+ ret = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
+ pcm->info_flags = 0;
+ pcm->private_data = dev;
+ strcpy(pcm->name, "Empia 28xx Capture");
+ strcpy(card->driver, "Empia Em28xx Audio");
+ strcpy(card->shortname, "Em28xx Audio");
+ strcpy(card->longname, "Empia Em28xx Audio");
+
+ err = snd_card_register(card);
+ if (err < 0) {
+ snd_card_free(card);
+ return -ENOMEM;
+ }
+ adev->sndcard = card;
+ adev->udev = dev->udev;
+ dev->adev = adev;
+
+ return 0;
+}
+
+static int em28xx_audio_fini(struct em28xx *dev)
+{
+ if (dev == NULL)
+ return 0;
+
+ if (dev->adev) {
+ snd_card_free(dev->adev->sndcard);
+ kfree(dev->adev);
+ dev->adev = NULL;
+ }
+
+ return 0;
+}
+
+static struct em28xx_ops audio_ops = {
+ .id = EM28XX_AUDIO,
+ .name = "Em28xx Audio Extension",
+ .init = em28xx_audio_init,
+ .fini = em28xx_audio_fini,
+};
+
+static int __init em28xx_alsa_register(void)
+{
+ return em28xx_register_extension(&audio_ops);
+}
+
+static void __exit em28xx_alsa_unregister(void)
+{
+ em28xx_unregister_extension(&audio_ops);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
+MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
+MODULE_DESCRIPTION("Em28xx Audio driver");
+
+module_init(em28xx_alsa_register);
+module_exit(em28xx_alsa_unregister);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.