linux/sound/sh/sh_dac_audio.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

434 lines
10 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_SUPPORTED_DEVICE("{{SuperH DAC audio support}}");
/* 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_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
return snd_pcm_lib_malloc_pages(substream,
params_buffer_bytes(hw_params));
}
static int snd_sh_dac_pcm_hw_free(struct snd_pcm_substream *substream)
{
return snd_pcm_lib_free_pages(substream);
}
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);
struct snd_pcm_runtime *runtime = substream->runtime;
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);
struct snd_pcm_runtime *runtime = substream->runtime;
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);
struct snd_pcm_runtime *runtime = substream->runtime;
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,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = snd_sh_dac_pcm_hw_params,
.hw_free = snd_sh_dac_pcm_hw_free,
.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_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
snd_dma_continuous_data(GFP_KERNEL),
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 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);