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media: tm6000: Clean up ALSA PCM API usages

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With the recent change in ALSA PCM core, the whole open-coded vmalloc
buffer handling in this driver can be dropped by replacing with the
managed buffer allocation.

Also, snd_tm6000_capture_free() is dropped since the check of
stream_started flag makes no sense; hw_free callback is guaranteed to
be called after the stream gets stopped.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Takashi Iwai 2019-12-10 14:58:45 +01:00 committed by Mauro Carvalho Chehab
parent 2d19a2cd80
commit f8239b531f
1 changed files with 1 additions and 80 deletions
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81
drivers/media/usb/tm6000/tm6000-alsa.c
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@ -10,7 +10,6 @@
#include <linux/interrupt.h>
#include <linux/usb.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <sound/core.h>
@ -94,40 +93,6 @@ static int _tm6000_stop_audio_dma(struct snd_tm6000_card *chip)
return 0;
}
static void dsp_buffer_free(struct snd_pcm_substream *substream)
{
struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);
dprintk(2, "Freeing buffer\n");
vfree(substream->runtime->dma_area);
substream->runtime->dma_area = NULL;
substream->runtime->dma_bytes = 0;
}
static int dsp_buffer_alloc(struct snd_pcm_substream *substream, int size)
{
struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);
dprintk(2, "Allocating buffer\n");
if (substream->runtime->dma_area) {
if (substream->runtime->dma_bytes > size)
return 0;
dsp_buffer_free(substream);
}
substream->runtime->dma_area = vmalloc(size);
if (!substream->runtime->dma_area)
return -ENOMEM;
substream->runtime->dma_bytes = size;
return 0;
}
/****************************************************************************
ALSA PCM Interface
****************************************************************************/
@ -268,40 +233,6 @@ static int tm6000_fillbuf(struct tm6000_core *core, char *buf, int size)
return 0;
}
/*
* hw_params callback
*/
static int snd_tm6000_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
int size, rc;
size = params_period_bytes(hw_params) * params_periods(hw_params);
rc = dsp_buffer_alloc(substream, size);
if (rc < 0)
return rc;
return 0;
}
/*
* hw free callback
*/
static int snd_tm6000_hw_free(struct snd_pcm_substream *substream)
{
struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);
struct tm6000_core *core = chip->core;
if (atomic_read(&core->stream_started) > 0) {
atomic_set(&core->stream_started, 0);
schedule_work(&core->wq_trigger);
}
dsp_buffer_free(substream);
return 0;
}
/*
* prepare callback
*/
@ -369,14 +300,6 @@ static snd_pcm_uframes_t snd_tm6000_pointer(struct snd_pcm_substream *substream)
return chip->buf_pos;
}
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);
}
/*
* operators
*/
@ -384,12 +307,9 @@ static const struct snd_pcm_ops snd_tm6000_pcm_ops = {
.open = snd_tm6000_pcm_open,
.close = snd_tm6000_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = snd_tm6000_hw_params,
.hw_free = snd_tm6000_hw_free,
.prepare = snd_tm6000_prepare,
.trigger = snd_tm6000_card_trigger,
.pointer = snd_tm6000_pointer,
.page = snd_pcm_get_vmalloc_page,
};
/*
@ -459,6 +379,7 @@ static int tm6000_audio_init(struct tm6000_core *dev)
strscpy(pcm->name, "Trident TM5600/60x0", sizeof(pcm->name));
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_tm6000_pcm_ops);
snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);
INIT_WORK(&dev->wq_trigger, audio_trigger);
rc = snd_card_register(card);