forked from Minki/linux
801e3659bf
The calculation of the left volume looks suspect, the value of
0x1f - ((val << 8) & 0x1f) is always 0x1f. The debug prior to the
assignment of value[1] prints the left volume setting using the
calculation 0x1f - (val >> 8) & 0x1f which looks correct to me.
Fix the left volume by using the correct expression as used in
the debug.
Detected by CoverityScan, CID#146140 ("Wrong operator used")
Fixes: 850d24a5a8
("[media] em28xx-alsa: add mixer support for AC97 volume controls")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
1061 lines
26 KiB
C
1061 lines
26 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) 2007-2016 Mauro Carvalho Chehab
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* - Port to work with the in-kernel driver
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* - Cleanups, fixes, alsa-controls, etc.
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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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#include "em28xx.h"
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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 <sound/tlv.h>
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#include <sound/ac97_codec.h>
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#include <media/v4l2-common.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 EM28XX_MAX_AUDIO_BUFS 5
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#define EM28XX_MIN_AUDIO_PACKETS 64
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#define dprintk(fmt, arg...) do { \
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if (debug) \
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dev_printk(KERN_DEBUG, &dev->intf->dev, \
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"video: %s: " fmt, __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_deinit_isoc_audio(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 < dev->adev.num_urb; i++) {
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struct urb *urb = dev->adev.urb[i];
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if (!irqs_disabled())
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usb_kill_urb(urb);
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else
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usb_unlink_urb(urb);
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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->disconnected) {
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dprintk("device disconnected while streaming. URB status=%d.\n",
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urb->status);
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atomic_set(&dev->adev.stream_started, 0);
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return;
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}
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switch (urb->status) {
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case 0: /* success */
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case -ETIMEDOUT: /* NAK */
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break;
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case -ECONNRESET: /* kill */
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case -ENOENT:
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case -ESHUTDOWN:
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return;
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default: /* error */
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dprintk("urb completition error %d.\n", urb->status);
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break;
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}
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if (atomic_read(&dev->adev.stream_started) == 0)
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return;
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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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status = usb_submit_urb(urb, GFP_ATOMIC);
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if (status < 0)
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dev_err(&dev->intf->dev,
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"resubmit of audio urb failed (error=%i)\n",
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status);
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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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dprintk("Starting isoc transfers\n");
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/* Start streaming */
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for (i = 0; i < dev->adev.num_urb; i++) {
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memset(dev->adev.transfer_buffer[i], 0x80,
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dev->adev.urb[i]->transfer_buffer_length);
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errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
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if (errCode) {
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dev_err(&dev->intf->dev,
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"submit of audio urb failed (error=%i)\n",
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errCode);
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em28xx_deinit_isoc_audio(dev);
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atomic_set(&dev->adev.stream_started, 0);
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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 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 em28xx *dev = snd_pcm_substream_chip(subs);
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struct snd_pcm_runtime *runtime = subs->runtime;
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dprintk("Allocating 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 const 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_BATCH |
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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_48000,
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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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/*
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* The period is 12.288 bytes. Allow a 10% of variation along its
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* value, in order to avoid overruns/underruns due to some clock
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* drift.
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*
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* FIXME: This period assumes 64 packets, and a 48000 PCM rate.
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* Calculate it dynamically.
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*/
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.period_bytes_min = 11059,
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.period_bytes_max = 13516,
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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 nonblock, ret = 0;
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if (!dev) {
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pr_err("em28xx-audio: BUG: em28xx can't find device struct. Can't proceed with open\n");
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return -ENODEV;
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}
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if (dev->disconnected)
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return -ENODEV;
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dprintk("opening device and trying to acquire exclusive lock\n");
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nonblock = !!(substream->f_flags & O_NONBLOCK);
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if (nonblock) {
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if (!mutex_trylock(&dev->lock))
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return -EAGAIN;
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} else
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mutex_lock(&dev->lock);
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runtime->hw = snd_em28xx_hw_capture;
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if (dev->adev.users == 0) {
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if (dev->alt == 0 || dev->is_audio_only) {
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struct usb_device *udev = interface_to_usbdev(dev->intf);
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if (dev->is_audio_only)
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/* audio is on a separate interface */
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dev->alt = 1;
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else
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/* audio is on the same interface as video */
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dev->alt = 7;
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/*
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* FIXME: The intention seems to be to select
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* the alt setting with the largest
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* wMaxPacketSize for the video endpoint.
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* At least dev->alt should be used instead, but
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* we should probably not touch it at all if it
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* is already >0, because wMaxPacketSize of the
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* audio endpoints seems to be the same for all.
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*/
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dprintk("changing alternate number on interface %d to %d\n",
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dev->ifnum, dev->alt);
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usb_set_interface(udev, dev->ifnum, dev->alt);
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}
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/* Sets volume, mute, etc */
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dev->mute = 0;
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ret = em28xx_audio_analog_set(dev);
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if (ret < 0)
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goto err;
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}
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kref_get(&dev->ref);
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dev->adev.users++;
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mutex_unlock(&dev->lock);
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/* Dynamically adjust the period size */
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snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
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snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
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dev->adev.period * 95 / 100,
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dev->adev.period * 105 / 100);
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dev->adev.capture_pcm_substream = substream;
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return 0;
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err:
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mutex_unlock(&dev->lock);
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dev_err(&dev->intf->dev,
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"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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dprintk("closing device\n");
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dev->mute = 1;
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mutex_lock(&dev->lock);
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dev->adev.users--;
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if (atomic_read(&dev->adev.stream_started) > 0) {
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atomic_set(&dev->adev.stream_started, 0);
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schedule_work(&dev->adev.wq_trigger);
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}
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em28xx_audio_analog_set(dev);
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if (substream->runtime->dma_area) {
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dprintk("freeing\n");
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vfree(substream->runtime->dma_area);
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substream->runtime->dma_area = NULL;
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}
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mutex_unlock(&dev->lock);
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kref_put(&dev->ref, em28xx_free_device);
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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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int ret;
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struct em28xx *dev = snd_pcm_substream_chip(substream);
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|
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if (dev->disconnected)
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return -ENODEV;
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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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if (ret < 0)
|
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return ret;
|
|
#if 0
|
|
/* 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 */
|
|
unsigned int channels, rate, format;
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|
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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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#endif
|
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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)
|
|
{
|
|
struct em28xx *dev = snd_pcm_substream_chip(substream);
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struct em28xx_audio *adev = &dev->adev;
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|
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dprintk("Stop capture, if needed\n");
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|
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if (atomic_read(&adev->stream_started) > 0) {
|
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atomic_set(&adev->stream_started, 0);
|
|
schedule_work(&adev->wq_trigger);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
|
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{
|
|
struct em28xx *dev = snd_pcm_substream_chip(substream);
|
|
|
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if (dev->disconnected)
|
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return -ENODEV;
|
|
|
|
dev->adev.hwptr_done_capture = 0;
|
|
dev->adev.capture_transfer_done = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void audio_trigger(struct work_struct *work)
|
|
{
|
|
struct em28xx_audio *adev =
|
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container_of(work, struct em28xx_audio, wq_trigger);
|
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struct em28xx *dev = container_of(adev, struct em28xx, adev);
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|
|
if (atomic_read(&adev->stream_started)) {
|
|
dprintk("starting capture");
|
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em28xx_init_audio_isoc(dev);
|
|
} else {
|
|
dprintk("stopping capture");
|
|
em28xx_deinit_isoc_audio(dev);
|
|
}
|
|
}
|
|
|
|
static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
|
|
int cmd)
|
|
{
|
|
struct em28xx *dev = snd_pcm_substream_chip(substream);
|
|
int retval = 0;
|
|
|
|
if (dev->disconnected)
|
|
return -ENODEV;
|
|
|
|
switch (cmd) {
|
|
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
|
|
case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
|
|
case SNDRV_PCM_TRIGGER_START:
|
|
atomic_set(&dev->adev.stream_started, 1);
|
|
break;
|
|
case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
|
|
case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
|
atomic_set(&dev->adev.stream_started, 0);
|
|
break;
|
|
default:
|
|
retval = -EINVAL;
|
|
}
|
|
schedule_work(&dev->adev.wq_trigger);
|
|
return retval;
|
|
}
|
|
|
|
static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
|
|
*substream)
|
|
{
|
|
unsigned long flags;
|
|
struct em28xx *dev;
|
|
snd_pcm_uframes_t hwptr_done;
|
|
|
|
dev = snd_pcm_substream_chip(substream);
|
|
if (dev->disconnected)
|
|
return SNDRV_PCM_POS_XRUN;
|
|
|
|
spin_lock_irqsave(&dev->adev.slock, flags);
|
|
hwptr_done = dev->adev.hwptr_done_capture;
|
|
spin_unlock_irqrestore(&dev->adev.slock, flags);
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* AC97 volume control support
|
|
*/
|
|
static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
|
|
struct snd_ctl_elem_info *info)
|
|
{
|
|
struct em28xx *dev = snd_kcontrol_chip(kcontrol);
|
|
|
|
if (dev->disconnected)
|
|
return -ENODEV;
|
|
|
|
info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
|
|
info->count = 2;
|
|
info->value.integer.min = 0;
|
|
info->value.integer.max = 0x1f;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
|
|
struct snd_ctl_elem_value *value)
|
|
{
|
|
struct em28xx *dev = snd_kcontrol_chip(kcontrol);
|
|
struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
|
|
u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
|
|
(0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
|
|
int nonblock = 0;
|
|
int rc;
|
|
|
|
if (dev->disconnected)
|
|
return -ENODEV;
|
|
|
|
if (substream)
|
|
nonblock = !!(substream->f_flags & O_NONBLOCK);
|
|
if (nonblock) {
|
|
if (!mutex_trylock(&dev->lock))
|
|
return -EAGAIN;
|
|
} else
|
|
mutex_lock(&dev->lock);
|
|
rc = em28xx_read_ac97(dev, kcontrol->private_value);
|
|
if (rc < 0)
|
|
goto err;
|
|
|
|
val |= rc & 0x8000; /* Preserve the mute flag */
|
|
|
|
rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
|
|
if (rc < 0)
|
|
goto err;
|
|
|
|
dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
|
|
(val & 0x8000) ? "muted " : "",
|
|
0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
|
|
val, (int)kcontrol->private_value);
|
|
|
|
err:
|
|
mutex_unlock(&dev->lock);
|
|
return rc;
|
|
}
|
|
|
|
static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
|
|
struct snd_ctl_elem_value *value)
|
|
{
|
|
struct em28xx *dev = snd_kcontrol_chip(kcontrol);
|
|
struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
|
|
int nonblock = 0;
|
|
int val;
|
|
|
|
if (dev->disconnected)
|
|
return -ENODEV;
|
|
|
|
if (substream)
|
|
nonblock = !!(substream->f_flags & O_NONBLOCK);
|
|
if (nonblock) {
|
|
if (!mutex_trylock(&dev->lock))
|
|
return -EAGAIN;
|
|
} else
|
|
mutex_lock(&dev->lock);
|
|
val = em28xx_read_ac97(dev, kcontrol->private_value);
|
|
mutex_unlock(&dev->lock);
|
|
if (val < 0)
|
|
return val;
|
|
|
|
dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
|
|
(val & 0x8000) ? "muted " : "",
|
|
0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
|
|
val, (int)kcontrol->private_value);
|
|
|
|
value->value.integer.value[0] = 0x1f - (val & 0x1f);
|
|
value->value.integer.value[1] = 0x1f - ((val >> 8) & 0x1f);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
|
|
struct snd_ctl_elem_value *value)
|
|
{
|
|
struct em28xx *dev = snd_kcontrol_chip(kcontrol);
|
|
u16 val = value->value.integer.value[0];
|
|
struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
|
|
int nonblock = 0;
|
|
int rc;
|
|
|
|
if (dev->disconnected)
|
|
return -ENODEV;
|
|
|
|
if (substream)
|
|
nonblock = !!(substream->f_flags & O_NONBLOCK);
|
|
if (nonblock) {
|
|
if (!mutex_trylock(&dev->lock))
|
|
return -EAGAIN;
|
|
} else
|
|
mutex_lock(&dev->lock);
|
|
rc = em28xx_read_ac97(dev, kcontrol->private_value);
|
|
if (rc < 0)
|
|
goto err;
|
|
|
|
if (val)
|
|
rc &= 0x1f1f;
|
|
else
|
|
rc |= 0x8000;
|
|
|
|
rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
|
|
if (rc < 0)
|
|
goto err;
|
|
|
|
dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
|
|
(val & 0x8000) ? "muted " : "",
|
|
0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
|
|
val, (int)kcontrol->private_value);
|
|
|
|
err:
|
|
mutex_unlock(&dev->lock);
|
|
return rc;
|
|
}
|
|
|
|
static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
|
|
struct snd_ctl_elem_value *value)
|
|
{
|
|
struct em28xx *dev = snd_kcontrol_chip(kcontrol);
|
|
struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
|
|
int nonblock = 0;
|
|
int val;
|
|
|
|
if (dev->disconnected)
|
|
return -ENODEV;
|
|
|
|
if (substream)
|
|
nonblock = !!(substream->f_flags & O_NONBLOCK);
|
|
if (nonblock) {
|
|
if (!mutex_trylock(&dev->lock))
|
|
return -EAGAIN;
|
|
} else
|
|
mutex_lock(&dev->lock);
|
|
val = em28xx_read_ac97(dev, kcontrol->private_value);
|
|
mutex_unlock(&dev->lock);
|
|
if (val < 0)
|
|
return val;
|
|
|
|
if (val & 0x8000)
|
|
value->value.integer.value[0] = 0;
|
|
else
|
|
value->value.integer.value[0] = 1;
|
|
|
|
dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
|
|
(val & 0x8000) ? "muted " : "",
|
|
0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
|
|
val, (int)kcontrol->private_value);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
|
|
|
|
static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
|
|
char *name, int id)
|
|
{
|
|
int err;
|
|
char ctl_name[44];
|
|
struct snd_kcontrol *kctl;
|
|
struct snd_kcontrol_new tmp;
|
|
|
|
memset(&tmp, 0, sizeof(tmp));
|
|
tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
|
|
tmp.private_value = id,
|
|
tmp.name = ctl_name,
|
|
|
|
/* Add Mute Control */
|
|
sprintf(ctl_name, "%s Switch", name);
|
|
tmp.get = em28xx_vol_get_mute;
|
|
tmp.put = em28xx_vol_put_mute;
|
|
tmp.info = snd_ctl_boolean_mono_info;
|
|
kctl = snd_ctl_new1(&tmp, dev);
|
|
err = snd_ctl_add(card, kctl);
|
|
if (err < 0)
|
|
return err;
|
|
dprintk("Added control %s for ac97 volume control 0x%04x\n",
|
|
ctl_name, id);
|
|
|
|
memset(&tmp, 0, sizeof(tmp));
|
|
tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
|
|
tmp.private_value = id,
|
|
tmp.name = ctl_name,
|
|
|
|
/* Add Volume Control */
|
|
sprintf(ctl_name, "%s Volume", name);
|
|
tmp.get = em28xx_vol_get;
|
|
tmp.put = em28xx_vol_put;
|
|
tmp.info = em28xx_vol_info;
|
|
tmp.tlv.p = em28xx_db_scale,
|
|
kctl = snd_ctl_new1(&tmp, dev);
|
|
err = snd_ctl_add(card, kctl);
|
|
if (err < 0)
|
|
return err;
|
|
dprintk("Added control %s for ac97 volume control 0x%04x\n",
|
|
ctl_name, id);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* register/unregister code and data
|
|
*/
|
|
static const 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 void em28xx_audio_free_urb(struct em28xx *dev)
|
|
{
|
|
struct usb_device *udev = interface_to_usbdev(dev->intf);
|
|
int i;
|
|
|
|
for (i = 0; i < dev->adev.num_urb; i++) {
|
|
struct urb *urb = dev->adev.urb[i];
|
|
|
|
if (!urb)
|
|
continue;
|
|
|
|
usb_free_coherent(udev, urb->transfer_buffer_length,
|
|
dev->adev.transfer_buffer[i],
|
|
urb->transfer_dma);
|
|
|
|
usb_free_urb(urb);
|
|
}
|
|
kfree(dev->adev.urb);
|
|
kfree(dev->adev.transfer_buffer);
|
|
dev->adev.num_urb = 0;
|
|
}
|
|
|
|
/* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
|
|
static int em28xx_audio_ep_packet_size(struct usb_device *udev,
|
|
struct usb_endpoint_descriptor *e)
|
|
{
|
|
int size = le16_to_cpu(e->wMaxPacketSize);
|
|
|
|
if (udev->speed == USB_SPEED_HIGH)
|
|
return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03));
|
|
|
|
return size & 0x7ff;
|
|
}
|
|
|
|
static int em28xx_audio_urb_init(struct em28xx *dev)
|
|
{
|
|
struct usb_interface *intf;
|
|
struct usb_endpoint_descriptor *e, *ep = NULL;
|
|
struct usb_device *udev = interface_to_usbdev(dev->intf);
|
|
int i, ep_size, interval, num_urb, npackets;
|
|
int urb_size, bytes_per_transfer;
|
|
u8 alt;
|
|
|
|
if (dev->ifnum)
|
|
alt = 1;
|
|
else
|
|
alt = 7;
|
|
|
|
intf = usb_ifnum_to_if(udev, dev->ifnum);
|
|
|
|
if (intf->num_altsetting <= alt) {
|
|
dev_err(&dev->intf->dev, "alt %d doesn't exist on interface %d\n",
|
|
dev->ifnum, alt);
|
|
return -ENODEV;
|
|
}
|
|
|
|
for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
|
|
e = &intf->altsetting[alt].endpoint[i].desc;
|
|
if (!usb_endpoint_dir_in(e))
|
|
continue;
|
|
if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
|
|
ep = e;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!ep) {
|
|
dev_err(&dev->intf->dev, "Couldn't find an audio endpoint");
|
|
return -ENODEV;
|
|
}
|
|
|
|
ep_size = em28xx_audio_ep_packet_size(udev, ep);
|
|
interval = 1 << (ep->bInterval - 1);
|
|
|
|
dev_info(&dev->intf->dev,
|
|
"Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
|
|
EM28XX_EP_AUDIO, usb_speed_string(udev->speed),
|
|
dev->ifnum, alt, interval, ep_size);
|
|
|
|
/* Calculate the number and size of URBs to better fit the audio samples */
|
|
|
|
/*
|
|
* Estimate the number of bytes per DMA transfer.
|
|
*
|
|
* This is given by the bit rate (for now, only 48000 Hz) multiplied
|
|
* by 2 channels and 2 bytes/sample divided by the number of microframe
|
|
* intervals and by the microframe rate (125 us)
|
|
*/
|
|
bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
|
|
|
|
/*
|
|
* Estimate the number of transfer URBs. Don't let it go past the
|
|
* maximum number of URBs that is known to be supported by the device.
|
|
*/
|
|
num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
|
|
if (num_urb > EM28XX_MAX_AUDIO_BUFS)
|
|
num_urb = EM28XX_MAX_AUDIO_BUFS;
|
|
|
|
/*
|
|
* Now that we know the number of bytes per transfer and the number of
|
|
* URBs, estimate the typical size of an URB, in order to adjust the
|
|
* minimal number of packets.
|
|
*/
|
|
urb_size = bytes_per_transfer / num_urb;
|
|
|
|
/*
|
|
* Now, calculate the amount of audio packets to be filled on each
|
|
* URB. In order to preserve the old behaviour, use a minimal
|
|
* threshold for this value.
|
|
*/
|
|
npackets = EM28XX_MIN_AUDIO_PACKETS;
|
|
if (urb_size > ep_size * npackets)
|
|
npackets = DIV_ROUND_UP(urb_size, ep_size);
|
|
|
|
dev_info(&dev->intf->dev,
|
|
"Number of URBs: %d, with %d packets and %d size\n",
|
|
num_urb, npackets, urb_size);
|
|
|
|
/* Estimate the bytes per period */
|
|
dev->adev.period = urb_size * npackets;
|
|
|
|
/* Allocate space to store the number of URBs to be used */
|
|
|
|
dev->adev.transfer_buffer = kcalloc(num_urb,
|
|
sizeof(*dev->adev.transfer_buffer),
|
|
GFP_ATOMIC);
|
|
if (!dev->adev.transfer_buffer) {
|
|
return -ENOMEM;
|
|
}
|
|
|
|
dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC);
|
|
if (!dev->adev.urb) {
|
|
kfree(dev->adev.transfer_buffer);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Alloc memory for each URB and for each transfer buffer */
|
|
dev->adev.num_urb = num_urb;
|
|
for (i = 0; i < num_urb; i++) {
|
|
struct urb *urb;
|
|
int j, k;
|
|
void *buf;
|
|
|
|
urb = usb_alloc_urb(npackets, GFP_ATOMIC);
|
|
if (!urb) {
|
|
em28xx_audio_free_urb(dev);
|
|
return -ENOMEM;
|
|
}
|
|
dev->adev.urb[i] = urb;
|
|
|
|
buf = usb_alloc_coherent(udev, npackets * ep_size, GFP_ATOMIC,
|
|
&urb->transfer_dma);
|
|
if (!buf) {
|
|
dev_err(&dev->intf->dev,
|
|
"usb_alloc_coherent failed!\n");
|
|
em28xx_audio_free_urb(dev);
|
|
return -ENOMEM;
|
|
}
|
|
dev->adev.transfer_buffer[i] = buf;
|
|
|
|
urb->dev = udev;
|
|
urb->context = dev;
|
|
urb->pipe = usb_rcvisocpipe(udev, EM28XX_EP_AUDIO);
|
|
urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
|
|
urb->transfer_buffer = buf;
|
|
urb->interval = interval;
|
|
urb->complete = em28xx_audio_isocirq;
|
|
urb->number_of_packets = npackets;
|
|
urb->transfer_buffer_length = ep_size * npackets;
|
|
|
|
for (j = k = 0; j < npackets; j++, k += ep_size) {
|
|
urb->iso_frame_desc[j].offset = k;
|
|
urb->iso_frame_desc[j].length = ep_size;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int em28xx_audio_init(struct em28xx *dev)
|
|
{
|
|
struct em28xx_audio *adev = &dev->adev;
|
|
struct usb_device *udev = interface_to_usbdev(dev->intf);
|
|
struct snd_pcm *pcm;
|
|
struct snd_card *card;
|
|
static int devnr;
|
|
int err;
|
|
|
|
if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
|
|
/* This device does not support the extension (in this case
|
|
the device is expecting the snd-usb-audio module or
|
|
doesn't have analog audio support at all) */
|
|
return 0;
|
|
}
|
|
|
|
dev_info(&dev->intf->dev, "Binding audio extension\n");
|
|
|
|
kref_get(&dev->ref);
|
|
|
|
dev_info(&dev->intf->dev,
|
|
"em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n");
|
|
dev_info(&dev->intf->dev,
|
|
"em28xx-audio.c: Copyright (C) 2007-2016 Mauro Carvalho Chehab\n");
|
|
|
|
err = snd_card_new(&dev->intf->dev, index[devnr], "Em28xx Audio",
|
|
THIS_MODULE, 0, &card);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
spin_lock_init(&adev->slock);
|
|
adev->sndcard = card;
|
|
adev->udev = udev;
|
|
|
|
err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
|
|
if (err < 0)
|
|
goto card_free;
|
|
|
|
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, "Em28xx-Audio");
|
|
strcpy(card->shortname, "Em28xx Audio");
|
|
strcpy(card->longname, "Empia Em28xx Audio");
|
|
|
|
INIT_WORK(&adev->wq_trigger, audio_trigger);
|
|
|
|
if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
|
|
em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
|
|
em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
|
|
em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
|
|
em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
|
|
em28xx_cvol_new(card, dev, "CD", AC97_CD);
|
|
em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
|
|
em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
|
|
|
|
em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
|
|
em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
|
|
em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
|
|
em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
|
|
em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
|
|
}
|
|
|
|
err = em28xx_audio_urb_init(dev);
|
|
if (err)
|
|
goto card_free;
|
|
|
|
err = snd_card_register(card);
|
|
if (err < 0)
|
|
goto urb_free;
|
|
|
|
dev_info(&dev->intf->dev, "Audio extension successfully initialized\n");
|
|
return 0;
|
|
|
|
urb_free:
|
|
em28xx_audio_free_urb(dev);
|
|
|
|
card_free:
|
|
snd_card_free(card);
|
|
adev->sndcard = NULL;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int em28xx_audio_fini(struct em28xx *dev)
|
|
{
|
|
if (dev == NULL)
|
|
return 0;
|
|
|
|
if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
|
|
/* This device does not support the extension (in this case
|
|
the device is expecting the snd-usb-audio module or
|
|
doesn't have analog audio support at all) */
|
|
return 0;
|
|
}
|
|
|
|
dev_info(&dev->intf->dev, "Closing audio extension\n");
|
|
|
|
if (dev->adev.sndcard) {
|
|
snd_card_disconnect(dev->adev.sndcard);
|
|
flush_work(&dev->adev.wq_trigger);
|
|
|
|
em28xx_audio_free_urb(dev);
|
|
|
|
snd_card_free(dev->adev.sndcard);
|
|
dev->adev.sndcard = NULL;
|
|
}
|
|
|
|
kref_put(&dev->ref, em28xx_free_device);
|
|
return 0;
|
|
}
|
|
|
|
static int em28xx_audio_suspend(struct em28xx *dev)
|
|
{
|
|
if (dev == NULL)
|
|
return 0;
|
|
|
|
if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
|
|
return 0;
|
|
|
|
dev_info(&dev->intf->dev, "Suspending audio extension\n");
|
|
em28xx_deinit_isoc_audio(dev);
|
|
atomic_set(&dev->adev.stream_started, 0);
|
|
return 0;
|
|
}
|
|
|
|
static int em28xx_audio_resume(struct em28xx *dev)
|
|
{
|
|
if (dev == NULL)
|
|
return 0;
|
|
|
|
if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
|
|
return 0;
|
|
|
|
dev_info(&dev->intf->dev, "Resuming audio extension\n");
|
|
/* Nothing to do other than schedule_work() ?? */
|
|
schedule_work(&dev->adev.wq_trigger);
|
|
return 0;
|
|
}
|
|
|
|
static struct em28xx_ops audio_ops = {
|
|
.id = EM28XX_AUDIO,
|
|
.name = "Em28xx Audio Extension",
|
|
.init = em28xx_audio_init,
|
|
.fini = em28xx_audio_fini,
|
|
.suspend = em28xx_audio_suspend,
|
|
.resume = em28xx_audio_resume,
|
|
};
|
|
|
|
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");
|
|
MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
|
|
MODULE_VERSION(EM28XX_VERSION);
|
|
|
|
module_init(em28xx_alsa_register);
|
|
module_exit(em28xx_alsa_unregister);
|