linux/sound/sh/sh_dac_audio.c
Leon Romanovsky 6417f03132 module: remove never implemented MODULE_SUPPORTED_DEVICE
MODULE_SUPPORTED_DEVICE was added in pre-git era and never was
implemented. We can safely remove it, because the kernel has grown
to have many more reliable mechanisms to determine if device is
supported or not.

Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-03-17 13:16:18 -07:00

413 lines
9.5 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* sh_dac_audio.c - SuperH DAC audio driver for ALSA
*
* Copyright (c) 2009 by Rafael Ignacio Zurita <rizurita@yahoo.com>
*
* Based on sh_dac_audio.c (Copyright (C) 2004, 2005 by Andriy Skulysh)
*/
#include <linux/hrtimer.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/sh_dac_audio.h>
#include <asm/clock.h>
#include <asm/hd64461.h>
#include <mach/hp6xx.h>
#include <cpu/dac.h>
MODULE_AUTHOR("Rafael Ignacio Zurita <rizurita@yahoo.com>");
MODULE_DESCRIPTION("SuperH DAC audio driver");
MODULE_LICENSE("GPL");
/* Module Parameters */
static int index = SNDRV_DEFAULT_IDX1;
static char *id = SNDRV_DEFAULT_STR1;
module_param(index, int, 0444);
MODULE_PARM_DESC(index, "Index value for SuperH DAC audio.");
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for SuperH DAC audio.");
/* main struct */
struct snd_sh_dac {
struct snd_card *card;
struct snd_pcm_substream *substream;
struct hrtimer hrtimer;
ktime_t wakeups_per_second;
int rate;
int empty;
char *data_buffer, *buffer_begin, *buffer_end;
int processed; /* bytes proccesed, to compare with period_size */
int buffer_size;
struct dac_audio_pdata *pdata;
};
static void dac_audio_start_timer(struct snd_sh_dac *chip)
{
hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
HRTIMER_MODE_REL);
}
static void dac_audio_stop_timer(struct snd_sh_dac *chip)
{
hrtimer_cancel(&chip->hrtimer);
}
static void dac_audio_reset(struct snd_sh_dac *chip)
{
dac_audio_stop_timer(chip);
chip->buffer_begin = chip->buffer_end = chip->data_buffer;
chip->processed = 0;
chip->empty = 1;
}
static void dac_audio_set_rate(struct snd_sh_dac *chip)
{
chip->wakeups_per_second = 1000000000 / chip->rate;
}
/* PCM INTERFACE */
static const struct snd_pcm_hardware snd_sh_dac_pcm_hw = {
.info = (SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_HALF_DUPLEX),
.formats = SNDRV_PCM_FMTBIT_U8,
.rates = SNDRV_PCM_RATE_8000,
.rate_min = 8000,
.rate_max = 8000,
.channels_min = 1,
.channels_max = 1,
.buffer_bytes_max = (48*1024),
.period_bytes_min = 1,
.period_bytes_max = (48*1024),
.periods_min = 1,
.periods_max = 1024,
};
static int snd_sh_dac_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
runtime->hw = snd_sh_dac_pcm_hw;
chip->substream = substream;
chip->buffer_begin = chip->buffer_end = chip->data_buffer;
chip->processed = 0;
chip->empty = 1;
chip->pdata->start(chip->pdata);
return 0;
}
static int snd_sh_dac_pcm_close(struct snd_pcm_substream *substream)
{
struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
chip->substream = NULL;
dac_audio_stop_timer(chip);
chip->pdata->stop(chip->pdata);
return 0;
}
static int snd_sh_dac_pcm_prepare(struct snd_pcm_substream *substream)
{
struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = chip->substream->runtime;
chip->buffer_size = runtime->buffer_size;
memset(chip->data_buffer, 0, chip->pdata->buffer_size);
return 0;
}
static int snd_sh_dac_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
dac_audio_start_timer(chip);
break;
case SNDRV_PCM_TRIGGER_STOP:
chip->buffer_begin = chip->buffer_end = chip->data_buffer;
chip->processed = 0;
chip->empty = 1;
dac_audio_stop_timer(chip);
break;
default:
return -EINVAL;
}
return 0;
}
static int snd_sh_dac_pcm_copy(struct snd_pcm_substream *substream,
int channel, unsigned long pos,
void __user *src, unsigned long count)
{
/* channel is not used (interleaved data) */
struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
if (copy_from_user_toio(chip->data_buffer + pos, src, count))
return -EFAULT;
chip->buffer_end = chip->data_buffer + pos + count;
if (chip->empty) {
chip->empty = 0;
dac_audio_start_timer(chip);
}
return 0;
}
static int snd_sh_dac_pcm_copy_kernel(struct snd_pcm_substream *substream,
int channel, unsigned long pos,
void *src, unsigned long count)
{
/* channel is not used (interleaved data) */
struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
memcpy_toio(chip->data_buffer + pos, src, count);
chip->buffer_end = chip->data_buffer + pos + count;
if (chip->empty) {
chip->empty = 0;
dac_audio_start_timer(chip);
}
return 0;
}
static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream,
int channel, unsigned long pos,
unsigned long count)
{
/* channel is not used (interleaved data) */
struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
memset_io(chip->data_buffer + pos, 0, count);
chip->buffer_end = chip->data_buffer + pos + count;
if (chip->empty) {
chip->empty = 0;
dac_audio_start_timer(chip);
}
return 0;
}
static
snd_pcm_uframes_t snd_sh_dac_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_sh_dac *chip = snd_pcm_substream_chip(substream);
int pointer = chip->buffer_begin - chip->data_buffer;
return pointer;
}
/* pcm ops */
static const struct snd_pcm_ops snd_sh_dac_pcm_ops = {
.open = snd_sh_dac_pcm_open,
.close = snd_sh_dac_pcm_close,
.prepare = snd_sh_dac_pcm_prepare,
.trigger = snd_sh_dac_pcm_trigger,
.pointer = snd_sh_dac_pcm_pointer,
.copy_user = snd_sh_dac_pcm_copy,
.copy_kernel = snd_sh_dac_pcm_copy_kernel,
.fill_silence = snd_sh_dac_pcm_silence,
.mmap = snd_pcm_lib_mmap_iomem,
};
static int snd_sh_dac_pcm(struct snd_sh_dac *chip, int device)
{
int err;
struct snd_pcm *pcm;
/* device should be always 0 for us */
err = snd_pcm_new(chip->card, "SH_DAC PCM", device, 1, 0, &pcm);
if (err < 0)
return err;
pcm->private_data = chip;
strcpy(pcm->name, "SH_DAC PCM");
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sh_dac_pcm_ops);
/* buffer size=48K */
snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
NULL, 48 * 1024, 48 * 1024);
return 0;
}
/* END OF PCM INTERFACE */
/* driver .remove -- destructor */
static int snd_sh_dac_remove(struct platform_device *devptr)
{
snd_card_free(platform_get_drvdata(devptr));
return 0;
}
/* free -- it has been defined by create */
static int snd_sh_dac_free(struct snd_sh_dac *chip)
{
/* release the data */
kfree(chip->data_buffer);
kfree(chip);
return 0;
}
static int snd_sh_dac_dev_free(struct snd_device *device)
{
struct snd_sh_dac *chip = device->device_data;
return snd_sh_dac_free(chip);
}
static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle)
{
struct snd_sh_dac *chip = container_of(handle, struct snd_sh_dac,
hrtimer);
struct snd_pcm_runtime *runtime = chip->substream->runtime;
ssize_t b_ps = frames_to_bytes(runtime, runtime->period_size);
if (!chip->empty) {
sh_dac_output(*chip->buffer_begin, chip->pdata->channel);
chip->buffer_begin++;
chip->processed++;
if (chip->processed >= b_ps) {
chip->processed -= b_ps;
snd_pcm_period_elapsed(chip->substream);
}
if (chip->buffer_begin == (chip->data_buffer +
chip->buffer_size - 1))
chip->buffer_begin = chip->data_buffer;
if (chip->buffer_begin == chip->buffer_end)
chip->empty = 1;
}
if (!chip->empty)
hrtimer_start(&chip->hrtimer, chip->wakeups_per_second,
HRTIMER_MODE_REL);
return HRTIMER_NORESTART;
}
/* create -- chip-specific constructor for the cards components */
static int snd_sh_dac_create(struct snd_card *card,
struct platform_device *devptr,
struct snd_sh_dac **rchip)
{
struct snd_sh_dac *chip;
int err;
static const struct snd_device_ops ops = {
.dev_free = snd_sh_dac_dev_free,
};
*rchip = NULL;
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (chip == NULL)
return -ENOMEM;
chip->card = card;
hrtimer_init(&chip->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
chip->hrtimer.function = sh_dac_audio_timer;
dac_audio_reset(chip);
chip->rate = 8000;
dac_audio_set_rate(chip);
chip->pdata = devptr->dev.platform_data;
chip->data_buffer = kmalloc(chip->pdata->buffer_size, GFP_KERNEL);
if (chip->data_buffer == NULL) {
kfree(chip);
return -ENOMEM;
}
err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
if (err < 0) {
snd_sh_dac_free(chip);
return err;
}
*rchip = chip;
return 0;
}
/* driver .probe -- constructor */
static int snd_sh_dac_probe(struct platform_device *devptr)
{
struct snd_sh_dac *chip;
struct snd_card *card;
int err;
err = snd_card_new(&devptr->dev, index, id, THIS_MODULE, 0, &card);
if (err < 0) {
snd_printk(KERN_ERR "cannot allocate the card\n");
return err;
}
err = snd_sh_dac_create(card, devptr, &chip);
if (err < 0)
goto probe_error;
err = snd_sh_dac_pcm(chip, 0);
if (err < 0)
goto probe_error;
strcpy(card->driver, "snd_sh_dac");
strcpy(card->shortname, "SuperH DAC audio driver");
printk(KERN_INFO "%s %s", card->longname, card->shortname);
err = snd_card_register(card);
if (err < 0)
goto probe_error;
snd_printk(KERN_INFO "ALSA driver for SuperH DAC audio");
platform_set_drvdata(devptr, card);
return 0;
probe_error:
snd_card_free(card);
return err;
}
/*
* "driver" definition
*/
static struct platform_driver sh_dac_driver = {
.probe = snd_sh_dac_probe,
.remove = snd_sh_dac_remove,
.driver = {
.name = "dac_audio",
},
};
module_platform_driver(sh_dac_driver);