527 lines
13 KiB
C
527 lines
13 KiB
C
/*
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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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* Copyright (C) 2007 Mauro Carvalho Chehab <mchehab@infradead.org>
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* - Port to work with the in-kernel driver
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* - Several cleanups
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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/module.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 <media/v4l2-common.h>
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#include "em28xx.h"
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static int debug;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "activates debug info");
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#define dprintk(fmt, arg...) do { \
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if (debug) \
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printk(KERN_INFO "em28xx-audio %s: " fmt, \
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__func__, ##arg); \
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} while (0)
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static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
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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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dprintk("Stopping isoc\n");
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for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
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if (!irqs_disabled())
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usb_kill_urb(dev->adev.urb[i]);
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else
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usb_unlink_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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kfree(dev->adev.transfer_buffer[i]);
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dev->adev.transfer_buffer[i] = NULL;
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}
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return 0;
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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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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 =
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urb->iso_frame_desc[i].actual_length / stride;
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cp = (unsigned char *)urb->transfer_buffer +
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urb->iso_frame_desc[i].offset;
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if (!length)
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continue;
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oldptr = dev->adev.hwptr_done_capture;
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if (oldptr + length >= runtime->buffer_size) {
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unsigned int cnt =
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runtime->buffer_size - oldptr;
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memcpy(runtime->dma_area + oldptr * stride, cp,
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cnt * stride);
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memcpy(runtime->dma_area, cp + cnt * stride,
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length * stride - cnt * stride);
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} else {
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memcpy(runtime->dma_area + oldptr * stride, cp,
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length * stride);
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}
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snd_pcm_stream_lock(substream);
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dev->adev.hwptr_done_capture += length;
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if (dev->adev.hwptr_done_capture >=
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runtime->buffer_size)
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dev->adev.hwptr_done_capture -=
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runtime->buffer_size;
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dev->adev.capture_transfer_done += length;
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if (dev->adev.capture_transfer_done >=
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runtime->period_size) {
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dev->adev.capture_transfer_done -=
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runtime->period_size;
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period_elapsed = 1;
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}
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snd_pcm_stream_unlock(substream);
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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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urb->status = 0;
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if (dev->adev.shutdown)
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return;
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status = usb_submit_urb(urb, GFP_ATOMIC);
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if (status < 0) {
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em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
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status);
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}
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return;
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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, errCode;
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const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
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EM28XX_AUDIO_MAX_PACKET_SIZE;
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dprintk("Starting isoc transfers\n");
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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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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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em28xx_errdev("usb_alloc_urb failed!\n");
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for (j = 0; j < i; j++) {
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usb_free_urb(dev->adev.urb[j]);
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kfree(dev->adev.transfer_buffer[j]);
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}
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return -ENOMEM;
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}
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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;
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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 =
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EM28XX_AUDIO_MAX_PACKET_SIZE;
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}
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dev->adev.urb[i] = urb;
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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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dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON) ?
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"stop" : "start");
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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(KERN_ERR "An underrun very likely occurred. "
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"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 int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
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size_t size)
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{
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struct snd_pcm_runtime *runtime = subs->runtime;
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dprintk("Alocating vbuffer\n");
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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 |
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_INTERLEAVED |
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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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struct em28xx *dev = snd_pcm_substream_chip(substream);
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struct snd_pcm_runtime *runtime = substream->runtime;
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int ret = 0;
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dprintk("opening device and trying to acquire exclusive lock\n");
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if (!dev) {
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printk(KERN_ERR "BUG: em28xx can't find device struct."
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" Can't proceed with open\n");
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return -ENODEV;
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}
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/* Sets volume, mute, etc */
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dev->mute = 0;
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mutex_lock(&dev->lock);
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ret = em28xx_audio_analog_set(dev);
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mutex_unlock(&dev->lock);
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if (ret < 0)
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goto err;
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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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dprintk("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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err:
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printk(KERN_ERR "Error while configuring em28xx mixer\n");
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return ret;
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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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dev->adev.users--;
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dprintk("closing device\n");
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dev->mute = 1;
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mutex_lock(&dev->lock);
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em28xx_audio_analog_set(dev);
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mutex_unlock(&dev->lock);
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if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
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dprintk("audio users: %d\n", dev->adev.users);
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dprintk("disabling audio stream!\n");
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dev->adev.shutdown = 0;
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dprintk("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,
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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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dprintk("Setting capture parameters\n");
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ret = snd_pcm_alloc_vmalloc_buffer(substream,
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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,
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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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dprintk("Stop capture, if needed\n");
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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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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,
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int cmd)
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{
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struct em28xx *dev = snd_pcm_substream_chip(substream);
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dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
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"start": "stop");
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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 snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
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*substream)
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{
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unsigned long flags;
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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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spin_lock_irqsave(&dev->adev.slock, flags);
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hwptr_done = dev->adev.hwptr_done_capture;
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spin_unlock_irqrestore(&dev->adev.slock, flags);
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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 = &dev->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 err;
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if (dev->has_alsa_audio != 1) {
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/* This device does not support the extension (in this case
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the device is expecting the snd-usb-audio module or
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doesn't have analog audio support at all) */
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return 0;
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}
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printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
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"non standard usbaudio\n");
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printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
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"Rechberger\n");
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err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
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&card);
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if (err < 0)
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return err;
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spin_lock_init(&adev->slock);
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err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
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if (err < 0) {
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snd_card_free(card);
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return err;
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}
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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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snd_card_set_dev(card, &dev->udev->dev);
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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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err = snd_card_register(card);
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if (err < 0) {
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snd_card_free(card);
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return err;
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}
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adev->sndcard = card;
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adev->udev = dev->udev;
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return 0;
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}
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static int em28xx_audio_fini(struct em28xx *dev)
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{
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if (dev == NULL)
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return 0;
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if (dev->has_alsa_audio != 1) {
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/* This device does not support the extension (in this case
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the device is expecting the snd-usb-audio module or
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doesn't have analog audio support at all) */
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return 0;
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}
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if (dev->adev.sndcard) {
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snd_card_free(dev->adev.sndcard);
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dev->adev.sndcard = NULL;
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}
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return 0;
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}
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static struct em28xx_ops audio_ops = {
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.id = EM28XX_AUDIO,
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.name = "Em28xx Audio Extension",
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.init = em28xx_audio_init,
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.fini = em28xx_audio_fini,
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};
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static int __init em28xx_alsa_register(void)
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{
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return em28xx_register_extension(&audio_ops);
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}
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static void __exit em28xx_alsa_unregister(void)
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{
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em28xx_unregister_extension(&audio_ops);
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}
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
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MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
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MODULE_DESCRIPTION("Em28xx Audio driver");
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module_init(em28xx_alsa_register);
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module_exit(em28xx_alsa_unregister);
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