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