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985 lines
25 KiB
985 lines
25 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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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 <[email protected]> |
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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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#include "em28xx.h" |
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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/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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|
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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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|
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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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|
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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 completion 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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|
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for (i = 0; i < urb->number_of_packets; i++) { |
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unsigned long flags; |
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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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|
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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_irqsave(substream, flags); |
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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_irqrestore(substream, flags); |
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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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} |
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static int em28xx_init_audio_isoc(struct em28xx *dev) |
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{ |
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int i, err; |
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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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err = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); |
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if (err) { |
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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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err); |
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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 err; |
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} |
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} |
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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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|
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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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} |
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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 || dev->is_audio_only) { |
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struct usb_device *udev; |
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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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|
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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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|
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return 0; |
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err: |
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mutex_unlock(&dev->lock); |
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|
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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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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_prepare(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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|
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if (dev->disconnected) |
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return -ENODEV; |
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dev->adev.hwptr_done_capture = 0; |
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dev->adev.capture_transfer_done = 0; |
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return 0; |
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} |
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static void audio_trigger(struct work_struct *work) |
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{ |
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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)) { |
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dprintk("starting capture"); |
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em28xx_init_audio_isoc(dev); |
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} else { |
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dprintk("stopping capture"); |
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em28xx_deinit_isoc_audio(dev); |
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} |
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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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int retval = 0; |
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if (dev->disconnected) |
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return -ENODEV; |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
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case SNDRV_PCM_TRIGGER_RESUME: |
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case SNDRV_PCM_TRIGGER_START: |
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atomic_set(&dev->adev.stream_started, 1); |
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break; |
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
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case SNDRV_PCM_TRIGGER_SUSPEND: |
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case SNDRV_PCM_TRIGGER_STOP: |
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atomic_set(&dev->adev.stream_started, 0); |
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break; |
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default: |
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retval = -EINVAL; |
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} |
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schedule_work(&dev->adev.wq_trigger); |
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return retval; |
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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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|
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dev = snd_pcm_substream_chip(substream); |
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if (dev->disconnected) |
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return SNDRV_PCM_POS_XRUN; |
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|
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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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|
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return hwptr_done; |
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} |
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|
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/* |
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* AC97 volume control support |
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*/ |
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static int em28xx_vol_info(struct snd_kcontrol *kcontrol, |
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struct snd_ctl_elem_info *info) |
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{ |
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struct em28xx *dev = snd_kcontrol_chip(kcontrol); |
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|
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if (dev->disconnected) |
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return -ENODEV; |
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|
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info->type = SNDRV_CTL_ELEM_TYPE_INTEGER; |
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info->count = 2; |
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info->value.integer.min = 0; |
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info->value.integer.max = 0x1f; |
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|
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return 0; |
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} |
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|
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static int em28xx_vol_put(struct snd_kcontrol *kcontrol, |
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struct snd_ctl_elem_value *value) |
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{ |
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struct em28xx *dev = snd_kcontrol_chip(kcontrol); |
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struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; |
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u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) | |
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(0x1f - (value->value.integer.value[1] & 0x1f)) << 8; |
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int nonblock = 0; |
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int rc; |
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|
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if (dev->disconnected) |
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return -ENODEV; |
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|
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if (substream) |
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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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} |
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rc = em28xx_read_ac97(dev, kcontrol->private_value); |
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if (rc < 0) |
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goto err; |
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|
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val |= rc & 0x8000; /* Preserve the mute flag */ |
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|
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rc = em28xx_write_ac97(dev, kcontrol->private_value, val); |
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if (rc < 0) |
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goto err; |
|
|
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dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n", |
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(val & 0x8000) ? "muted " : "", |
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0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), |
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val, (int)kcontrol->private_value); |
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|
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err: |
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mutex_unlock(&dev->lock); |
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return rc; |
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} |
|
|
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static int em28xx_vol_get(struct snd_kcontrol *kcontrol, |
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struct snd_ctl_elem_value *value) |
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{ |
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struct em28xx *dev = snd_kcontrol_chip(kcontrol); |
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struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; |
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int nonblock = 0; |
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int val; |
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|
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if (dev->disconnected) |
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return -ENODEV; |
|
|
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if (substream) |
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nonblock = !!(substream->f_flags & O_NONBLOCK); |
|
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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} |
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val = em28xx_read_ac97(dev, kcontrol->private_value); |
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mutex_unlock(&dev->lock); |
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if (val < 0) |
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return val; |
|
|
|
dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n", |
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(val & 0x8000) ? "muted " : "", |
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0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), |
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val, (int)kcontrol->private_value); |
|
|
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value->value.integer.value[0] = 0x1f - (val & 0x1f); |
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value->value.integer.value[1] = 0x1f - ((val >> 8) & 0x1f); |
|
|
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return 0; |
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} |
|
|
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static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol, |
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struct snd_ctl_elem_value *value) |
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{ |
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struct em28xx *dev = snd_kcontrol_chip(kcontrol); |
|
u16 val = value->value.integer.value[0]; |
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struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; |
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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; |
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else |
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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, |
|
.prepare = snd_em28xx_prepare, |
|
.trigger = snd_em28xx_capture_trigger, |
|
.pointer = snd_em28xx_capture_pointer, |
|
}; |
|
|
|
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_KERNEL); |
|
if (!dev->adev.transfer_buffer) |
|
return -ENOMEM; |
|
|
|
dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_KERNEL); |
|
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_KERNEL); |
|
if (!urb) { |
|
em28xx_audio_free_urb(dev); |
|
return -ENOMEM; |
|
} |
|
dev->adev.urb[i] = urb; |
|
|
|
buf = usb_alloc_coherent(udev, npackets * ep_size, GFP_KERNEL, |
|
&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); |
|
snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0); |
|
pcm->info_flags = 0; |
|
pcm->private_data = dev; |
|
strscpy(pcm->name, "Empia 28xx Capture", sizeof(pcm->name)); |
|
|
|
strscpy(card->driver, "Em28xx-Audio", sizeof(card->driver)); |
|
strscpy(card->shortname, "Em28xx Audio", sizeof(card->shortname)); |
|
strscpy(card->longname, "Empia Em28xx Audio", sizeof(card->longname)); |
|
|
|
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) |
|
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) |
|
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) |
|
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 v2"); |
|
MODULE_AUTHOR("Markus Rechberger <[email protected]>"); |
|
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);
|
|
|