ALSA: sh: add SuperH DAC audio driver for ALSA V4
This is a port of the sound/oss/sh_dac_audio.c driver. The driver uses an on-chip 8-bit D/A converter, which has a speaker connected to one of its channels, found in several ancient HP machines. For interrupts it uses a high-resolution timer (hrtimer). Tested on SH7709 based hp6xx (HP Jornada 680/690 and HP Palmtop 620lx/660lx). Also, since OSS Emulation works, the old OSS sound/oss/sh_dac_audio.c driver would be obsolete soon, and it could be removed. Signed-off-by: Rafael Ignacio Zurita <rizurita@yahoo.com> Acked-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Rafael Ignacio Zurita
Takashi Iwai
parent
bcc2c6b7cb
commit
9dcaa7b25f
@ -13,6 +13,7 @@
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/irq.h>
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#include <sound/sh_dac_audio.h>
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#include <asm/hd64461.h>
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#include <asm/io.h>
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#include <mach/hp6xx.h>
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@ -51,9 +52,63 @@ static struct platform_device jornadakbd_device = {
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.id = -1,
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};
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static void dac_audio_start(struct dac_audio_pdata *pdata)
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{
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u16 v;
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u8 v8;
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/* HP Jornada 680/690 speaker on */
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v = inw(HD64461_GPADR);
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v &= ~HD64461_GPADR_SPEAKER;
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outw(v, HD64461_GPADR);
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/* HP Palmtop 620lx/660lx speaker on */
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v8 = inb(PKDR);
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v8 &= ~PKDR_SPEAKER;
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outb(v8, PKDR);
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sh_dac_enable(pdata->channel);
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}
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static void dac_audio_stop(struct dac_audio_pdata *pdata)
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{
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u16 v;
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u8 v8;
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/* HP Jornada 680/690 speaker off */
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v = inw(HD64461_GPADR);
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v |= HD64461_GPADR_SPEAKER;
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outw(v, HD64461_GPADR);
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/* HP Palmtop 620lx/660lx speaker off */
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v8 = inb(PKDR);
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v8 |= PKDR_SPEAKER;
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outb(v8, PKDR);
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sh_dac_output(0, pdata->channel);
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sh_dac_disable(pdata->channel);
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}
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static struct dac_audio_pdata dac_audio_platform_data = {
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.buffer_size = 64000,
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.channel = 1,
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.start = dac_audio_start,
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.stop = dac_audio_stop,
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};
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static struct platform_device dac_audio_device = {
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.name = "dac_audio",
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.id = -1,
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.dev = {
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.platform_data = &dac_audio_platform_data,
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}
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};
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static struct platform_device *hp6xx_devices[] __initdata = {
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&cf_ide_device,
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&jornadakbd_device,
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&dac_audio_device,
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};
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static void __init hp6xx_init_irq(void)
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@ -29,6 +29,9 @@
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#define PKDR_LED_GREEN 0x10
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/* HP Palmtop 620lx/660lx speaker on/off */
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#define PKDR_SPEAKER 0x20
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#define SCPDR_TS_SCAN_ENABLE 0x20
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#define SCPDR_TS_SCAN_Y 0x02
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#define SCPDR_TS_SCAN_X 0x01
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@ -42,6 +45,7 @@
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#define ADC_CHANNEL_BACKUP 4
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#define ADC_CHANNEL_CHARGE 5
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/* HP Jornada 680/690 speaker on/off */
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#define HD64461_GPADR_SPEAKER 0x01
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#define HD64461_GPADR_PCMCIA0 (0x02|0x08)
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21
include/sound/sh_dac_audio.h
Normal file
21
include/sound/sh_dac_audio.h
Normal file
@ -0,0 +1,21 @@
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/*
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* SH_DAC specific configuration, for the dac_audio platform_device
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*
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* Copyright (C) 2009 Rafael Ignacio Zurita <rizurita@yahoo.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#ifndef __INCLUDE_SH_DAC_AUDIO_H
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#define __INCLUDE_SH_DAC_AUDIO_H
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struct dac_audio_pdata {
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int buffer_size;
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int channel;
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void (*start)(struct dac_audio_pdata *pd);
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void (*stop)(struct dac_audio_pdata *pd);
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};
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#endif /* __INCLUDE_SH_DAC_AUDIO_H */
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@ -19,5 +19,13 @@ config SND_AICA
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help
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ALSA Sound driver for the SEGA Dreamcast console.
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config SND_SH_DAC_AUDIO
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tristate "SuperH DAC audio support"
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depends on SND
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depends on CPU_SH3 && HIGH_RES_TIMERS
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select SND_PCM
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help
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Say Y here to include support for the on-chip DAC.
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endif # SND_SUPERH
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@ -3,6 +3,8 @@
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#
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snd-aica-objs := aica.o
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snd-sh_dac_audio-objs := sh_dac_audio.o
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# Toplevel Module Dependency
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obj-$(CONFIG_SND_AICA) += snd-aica.o
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obj-$(CONFIG_SND_SH_DAC_AUDIO) += snd-sh_dac_audio.o
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453
sound/sh/sh_dac_audio.c
Normal file
453
sound/sh/sh_dac_audio.c
Normal file
@ -0,0 +1,453 @@
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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 <rizurita@yahoo.com>
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*
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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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* 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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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 <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 <rizurita@yahoo.com>");
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MODULE_DESCRIPTION("SuperH DAC audio driver");
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MODULE_LICENSE("GPL");
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MODULE_SUPPORTED_DEVICE("{{SuperH DAC audio support}}");
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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 = ktime_set(0, 1000000000 / chip->rate);
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}
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/* PCM INTERFACE */
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static 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_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *hw_params)
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{
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return snd_pcm_lib_malloc_pages(substream,
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params_buffer_bytes(hw_params));
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}
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static int snd_sh_dac_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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return snd_pcm_lib_free_pages(substream);
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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, int channel,
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snd_pcm_uframes_t pos, void __user *src, snd_pcm_uframes_t 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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struct snd_pcm_runtime *runtime = substream->runtime;
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ssize_t b_count = frames_to_bytes(runtime , count);
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ssize_t b_pos = frames_to_bytes(runtime , pos);
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if (count < 0)
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return -EINVAL;
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if (!count)
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return 0;
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memcpy_toio(chip->data_buffer + b_pos, src, b_count);
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chip->buffer_end = chip->data_buffer + b_pos + b_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, snd_pcm_uframes_t pos,
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snd_pcm_uframes_t 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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struct snd_pcm_runtime *runtime = substream->runtime;
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ssize_t b_count = frames_to_bytes(runtime , count);
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ssize_t b_pos = frames_to_bytes(runtime , pos);
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if (count < 0)
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return -EINVAL;
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if (!count)
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return 0;
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memset_io(chip->data_buffer + b_pos, 0, b_count);
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chip->buffer_end = chip->data_buffer + b_pos + b_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 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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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = snd_sh_dac_pcm_hw_params,
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.hw_free = snd_sh_dac_pcm_hw_free,
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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 = snd_sh_dac_pcm_copy,
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.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 __devinit 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_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
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snd_dma_continuous_data(GFP_KERNEL),
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48 * 1024,
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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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platform_set_drvdata(devptr, NULL);
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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++;
|
||||
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 __devinit 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 __devinit snd_sh_dac_probe(struct platform_device *devptr)
|
||||
{
|
||||
struct snd_sh_dac *chip;
|
||||
struct snd_card *card;
|
||||
int err;
|
||||
|
||||
err = snd_card_create(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("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 driver = {
|
||||
.probe = snd_sh_dac_probe,
|
||||
.remove = snd_sh_dac_remove,
|
||||
.driver = {
|
||||
.name = "dac_audio",
|
||||
},
|
||||
};
|
||||
|
||||
static int __init sh_dac_init(void)
|
||||
{
|
||||
return platform_driver_register(&driver);
|
||||
}
|
||||
|
||||
static void __exit sh_dac_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&driver);
|
||||
}
|
||||
|
||||
module_init(sh_dac_init);
|
||||
module_exit(sh_dac_exit);
|
||||
Loading…
Reference in New Issue
Block a user