diff options
Diffstat (limited to 'drivers/media/video/em28xx/em28xx-audio.c')
| -rw-r--r-- | drivers/media/video/em28xx/em28xx-audio.c | 489 |
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 00000000000..941357c4f3f --- /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); |