mirror of https://gitee.com/openkylin/linux.git
V4L/DVB (6949): Adds em28xx-audio module
em28xx-audio module exports em28xx Vendor Class audio as an -alsa driver. This module were written based on usbaudio driver by Markus Rechberger. Recently, he acked to allow us to merge it on kernel: http://lists-archives.org/video4linux/20408-supporting-prolink-pixelview-405-dvd-maker.html Thanks to Markus Rechberger <mrechberger@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Markus Rechberger
Mauro Carvalho Chehab
parent
74f38a8237
commit
a52932b405
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@ -0,0 +1,474 @@
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/*
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* Empiatech em28x1 audio extension
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*
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* Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
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*
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* This driver is based on my previous au600 usb pstn audio driver
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* and inherits all the copyrights
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/usb.h>
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#include <linux/init.h>
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#include <linux/sound.h>
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#include <linux/spinlock.h>
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#include <linux/soundcard.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/proc_fs.h>
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#include <linux/moduleparam.h>
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#include <sound/driver.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/info.h>
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#include <sound/initval.h>
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#include <sound/control.h>
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//#include <linux/video_decoder.h>
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//#include <media/tuner.h>
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#include <media/v4l2-common.h>
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#include "em28xx.h"
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static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
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static int em28xx_cmd(struct em28xx *dev, int cmd,int arg);
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static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, size_t size)
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{
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struct snd_pcm_runtime *runtime = subs->runtime;
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if(runtime->dma_area){
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if(runtime->dma_bytes > size)
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return 0;
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vfree(runtime->dma_area);
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}
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runtime->dma_area = vmalloc(size);
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if(!runtime ->dma_area)
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return -ENOMEM;
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runtime->dma_bytes = size;
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return 0;
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}
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static struct snd_pcm_hardware snd_em28xx_hw_capture = {
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.info = SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP_VALID,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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.rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
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.rate_min = 48000,
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.rate_max = 48000,
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.channels_min = 2,
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.channels_max = 2,
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.buffer_bytes_max = 62720*8, /* just about the value in usbaudio.c */
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.period_bytes_min = 64, //12544/2,
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.period_bytes_max = 12544,
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.periods_min = 2,
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.periods_max = 98, //12544,
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};
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static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
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{
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int ret = 0;
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int mode;
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struct em28xx *dev = snd_pcm_substream_chip(substream);
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struct snd_pcm_runtime *runtime = substream->runtime;
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printk("opening radio device and trying to acquire exclusive lock\n");
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switch(dev->mode){
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case TUNER_STUB_DVBC_TV:
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case TUNER_STUB_DVBT_TV:
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case TUNER_STUB_ATSC_TV:
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/* digital has no support for analog audio */
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if (ret != 0 ) {
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printk("device is already in use by DVB-T\n");
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return -EINVAL;
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} else {
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struct v4l2_tuner tuner;
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printk("switching device to FM mode\n");
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mode = TUNER_STUB_RADIO;
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memset(&tuner, 0x0, sizeof(struct v4l2_tuner));
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tuner.type = V4L2_TUNER_RADIO;
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/* enable GPIO for analog TV */
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dev->em28xx_gpio_control(dev, EM28XX_MODE, (void*)mode);
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dev->mode = mode;
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/* upload firmware */
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tuner_run_cmd(dev->tobj, TUNER_CMD_INIT, (void*)mode);
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/* required for devices which have kerneldriver dependencies */
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// em28xx_config(dev);
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// em28xx_config_i2c(dev);
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/* this is moreover to switch the decoder to FM */
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em28xx_i2c_call_clients(dev, VIDIOC_S_TUNER, &tuner);
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dev->em28xx_write_regs(dev, 0x0f, "\x87", 1);
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ret = dev->em28xx_acquire(dev, EM28XX_RADIO, 1);
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em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, 0);
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/* TODO switch to FM mode */
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printk("em28xx-audio: %d mode\n", mode);
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tuner_run_cmd(dev->tobj, TUNER_CMD_G_MODE, &mode);
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printk("retrieved mode from tuner: %d\n",mode);
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}
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break;
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case TUNER_STUB_ANALOG_TV:
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printk("em28xx-audio: device is currently in analog TV mode\n");
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/* unmute by default */
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dev->em28xx_write_regs(dev, 0x0f, "\x87", 1);
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break;
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case TUNER_STUB_RADIO:
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/* check current mode and put a hard lock onto it */
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printk("em28xx-audio: device is currently in analogue FM mode\n");
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/* unmute by default here */
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dev->em28xx_write_regs(dev, 0x0f, "\x87", 1);
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ret = dev->em28xx_acquire(dev, EM28XX_RADIO, 1);
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if ( ret == 0 )
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printk("device is locked in fmradio mode now\n");
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break;
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default:
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printk("em28xx-audio: unhandled mode %d\n", dev->mode);
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}
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runtime->hw = snd_em28xx_hw_capture;
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if(dev->alt == 0 && dev->adev->users == 0 ) {
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int errCode;
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dev->alt = 7;
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errCode = usb_set_interface(dev->udev, 0, 7);
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printk("changing alternate number to 7\n");
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}
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dev->adev->users++;
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snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
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dev->adev->capture_pcm_substream = substream;
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runtime->private_data = dev;
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return 0;
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}
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static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
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{
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struct em28xx *dev = snd_pcm_substream_chip(substream);
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int amode = 0;
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dev->adev->users--;
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/* decrease audio reference */
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switch(dev->mode) {
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case TUNER_STUB_ANALOG_TV:
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amode = EM28XX_VIDEO;
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break;
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case TUNER_STUB_RADIO:
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amode = EM28XX_RADIO;
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break;
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default:
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printk("invalid mode: %d\n",dev->mode);
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break;
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}
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dev->em28xx_acquire(dev, amode, 0);
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if(dev->adev->users == 0 && dev->adev->shutdown == 1) {
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printk("audio users: %d\n",dev->adev->users);
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printk("disabling audio stream!\n");
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dev->adev->shutdown = 0;
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printk("released lock\n");
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em28xx_cmd(dev,EM28XX_CAPTURE_STREAM_EN,0);
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}
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return 0;
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}
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static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params)
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{
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unsigned int channels, rate, format;
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int ret;
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ret = snd_pcm_alloc_vmalloc_buffer(substream, params_buffer_bytes(hw_params));
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format = params_format(hw_params);
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rate = params_rate(hw_params);
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channels = params_channels(hw_params);
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/* TODO: set up em28xx audio chip to deliver the correct audio format, current default is 48000hz multiplexed => 96000hz mono
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which shouldn't matter since analogue TV only supports mono*/
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return 0;
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}
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static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
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{
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struct em28xx *dev = snd_pcm_substream_chip(substream);
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if(dev->adev->capture_stream==STREAM_ON){
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em28xx_cmd(dev,EM28XX_CAPTURE_STREAM_EN,0);
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}
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return 0;
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}
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static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
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{
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return 0;
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}
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static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct em28xx *dev = snd_pcm_substream_chip(substream);
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switch(cmd){
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case SNDRV_PCM_TRIGGER_START:
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em28xx_cmd(dev,EM28XX_CAPTURE_STREAM_EN,1);
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return 0;
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case SNDRV_PCM_TRIGGER_STOP:
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dev->adev->shutdown=1;
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return 0;
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default:
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return -EINVAL;
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}
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}
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static void em28xx_audio_isocirq(struct urb *urb)
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{
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struct em28xx *dev=urb->context;
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int i;
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unsigned int oldptr;
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unsigned long flags;
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int period_elapsed = 0;
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int status;
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unsigned char *cp;
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unsigned int stride;
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struct snd_pcm_substream *substream;
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struct snd_pcm_runtime *runtime;
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if(dev->adev->capture_pcm_substream){
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substream=dev->adev->capture_pcm_substream;
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runtime=substream->runtime;
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stride = runtime->frame_bits >> 3;
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for(i=0;i<urb->number_of_packets;i++){
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int length=urb->iso_frame_desc[i].actual_length/stride;
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cp=(unsigned char *) urb->transfer_buffer + urb->iso_frame_desc[i].offset;
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if(!length)
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continue;
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spin_lock_irqsave(&dev->adev->slock, flags);
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oldptr = dev->adev->hwptr_done_capture;
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dev->adev->hwptr_done_capture +=length;
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if(dev->adev->hwptr_done_capture >= runtime->buffer_size)
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dev->adev->hwptr_done_capture -= runtime->buffer_size;
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dev->adev->capture_transfer_done += length;
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if(dev->adev->capture_transfer_done >= runtime->period_size){
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dev->adev->capture_transfer_done -= runtime->period_size;
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period_elapsed=1;
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}
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spin_unlock_irqrestore(&dev->adev->slock, flags);
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if(oldptr + length >= runtime->buffer_size){
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unsigned int cnt = runtime->buffer_size-oldptr-1;
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memcpy(runtime->dma_area+oldptr*stride, cp , cnt*stride);
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memcpy(runtime->dma_area, cp + cnt, length*stride - cnt*stride);
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} else {
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memcpy(runtime->dma_area+oldptr*stride, cp, length*stride);
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}
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}
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if(period_elapsed){
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snd_pcm_period_elapsed(substream);
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}
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}
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urb->status = 0;
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if(dev->adev->shutdown)
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return;
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if((status = usb_submit_urb(urb, GFP_ATOMIC))){
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em28xx_errdev("resubmit of audio urb failed (error=%i)\n", status);
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}
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return;
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}
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static int em28xx_isoc_audio_deinit(struct em28xx *dev)
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{
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int i;
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for(i=0;i<EM28XX_AUDIO_BUFS;i++){
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usb_kill_urb(dev->adev->urb[i]);
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usb_free_urb(dev->adev->urb[i]);
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dev->adev->urb[i]=NULL;
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}
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return 0;
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}
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static int em28xx_init_audio_isoc(struct em28xx *dev)
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{
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int i;
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int errCode;
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const int sb_size=EM28XX_NUM_AUDIO_PACKETS * EM28XX_AUDIO_MAX_PACKET_SIZE;
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for(i=0;i<EM28XX_AUDIO_BUFS;i++){
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struct urb *urb;
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int j,k;
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dev->adev->transfer_buffer[i]=kmalloc(sb_size,GFP_ATOMIC);
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if(!dev->adev->transfer_buffer[i]){
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return -ENOMEM;
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}
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memset(dev->adev->transfer_buffer[i],0x80,sb_size);
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urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS,GFP_ATOMIC);
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if(urb){
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urb->dev=dev->udev;
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urb->context=dev;
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urb->pipe=usb_rcvisocpipe(dev->udev,0x83);
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urb->transfer_flags = URB_ISO_ASAP;
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urb->transfer_buffer = dev->adev->transfer_buffer[i];
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urb->interval=1;
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urb->complete = em28xx_audio_isocirq;
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urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
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urb->transfer_buffer_length = sb_size;
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for(j=k=0; j<EM28XX_NUM_AUDIO_PACKETS;j++,k+=EM28XX_AUDIO_MAX_PACKET_SIZE){
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urb->iso_frame_desc[j].offset = k;
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urb->iso_frame_desc[j].length=EM28XX_AUDIO_MAX_PACKET_SIZE;
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}
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dev->adev->urb[i]=urb;
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} else {
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return -ENOMEM;
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}
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}
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for(i=0;i<EM28XX_AUDIO_BUFS;i++){
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errCode = usb_submit_urb(dev->adev->urb[i], GFP_ATOMIC);
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if (errCode){
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em28xx_isoc_audio_deinit(dev);
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return errCode;
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}
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}
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return 0;
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}
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static int em28xx_cmd(struct em28xx *dev, int cmd,int arg)
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{
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switch(cmd){
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case EM28XX_CAPTURE_STREAM_EN:
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if(dev->adev->capture_stream == STREAM_OFF && arg==1){
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dev->adev->capture_stream=STREAM_ON;
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em28xx_init_audio_isoc(dev);
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} else if (dev->adev->capture_stream==STREAM_ON && arg==0){
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dev->adev->capture_stream=STREAM_OFF;
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em28xx_isoc_audio_deinit(dev);
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} else {
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printk("An underrun occured very likely... ignoring it\n");
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}
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return 0;
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default:
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return -EINVAL;
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}
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}
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static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream *substream)
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{
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struct em28xx *dev;
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snd_pcm_uframes_t hwptr_done;
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dev = snd_pcm_substream_chip(substream);
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hwptr_done = dev->adev->hwptr_done_capture;
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return hwptr_done;
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}
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static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
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unsigned long offset)
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{
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void *pageptr = subs->runtime->dma_area + offset;
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return vmalloc_to_page(pageptr);
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}
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static struct snd_pcm_ops snd_em28xx_pcm_capture = {
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.open = snd_em28xx_capture_open,
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.close = snd_em28xx_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = snd_em28xx_hw_capture_params,
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.hw_free = snd_em28xx_hw_capture_free,
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.prepare = snd_em28xx_prepare,
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.trigger = snd_em28xx_capture_trigger,
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.pointer = snd_em28xx_capture_pointer,
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.page = snd_pcm_get_vmalloc_page,
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};
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static int em28xx_audio_init(struct em28xx *dev)
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{
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struct em28xx_audio *adev;
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struct snd_pcm *pcm;
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struct snd_card *card;
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static int devnr;
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int ret;
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int err;
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printk("em28xx-audio.c: probing for em28x1 non standard usbaudio\n");
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printk("em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n");
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adev=kzalloc(sizeof(*adev),GFP_KERNEL);
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if(!adev){
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printk("em28xx-audio.c: out of memory\n");
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return -1;
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}
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card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE,0);
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if(card==NULL){
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kfree(adev);
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return -ENOMEM;
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}
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spin_lock_init(&adev->slock);
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ret=snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
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snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
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pcm->info_flags = 0;
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pcm->private_data = dev;
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strcpy(pcm->name,"Empia 28xx Capture");
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strcpy(card->driver, "Empia Em28xx Audio");
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strcpy(card->shortname, "Em28xx Audio");
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strcpy(card->longname,"Empia Em28xx Audio");
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if((err = snd_card_register(card))<0){
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snd_card_free(card);
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||||
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)
|
||||
{
|
||||
request_module("em28xx");
|
||||
request_module("tuner");
|
||||
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_DESCRIPTION("Em28xx Audio driver");
|
||||
|
||||
module_init(em28xx_alsa_register);
|
||||
module_exit(em28xx_alsa_unregister);
|
||||
Loading…
Reference in New Issue