[deliverable/linux.git] / sound / oss / sh_dac_audio.c

/*
 * sound/oss/sh_dac_audio.c
 *
 * SH DAC based sound :(
 *
 *  Copyright (C) 2004,2005  Andriy Skulysh
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/linkage.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/sound.h>
#include <linux/soundcard.h>
#include <linux/interrupt.h>
#include <linux/hrtimer.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/irq.h>
#include <asm/delay.h>
#include <asm/clock.h>
#include <cpu/dac.h>
#include <asm/machvec.h>
#include <mach/hp6xx.h>
#include <asm/hd64461.h>

#define MODNAME "sh_dac_audio"

#define BUFFER_SIZE 48000

static int rate;
static int empty;
static char *data_buffer, *buffer_begin, *buffer_end;
static int in_use, device_major;
static struct hrtimer hrtimer;
static ktime_t wakeups_per_second;

static void dac_audio_start_timer(void)
{
	hrtimer_start(&hrtimer, wakeups_per_second, HRTIMER_MODE_REL);
}

static void dac_audio_stop_timer(void)
{
	hrtimer_cancel(&hrtimer);
}

static void dac_audio_reset(void)
{
	dac_audio_stop_timer();
	buffer_begin = buffer_end = data_buffer;
	empty = 1;
}

static void dac_audio_sync(void)
{
	while (!empty)
		schedule();
}

static void dac_audio_start(void)
{
	if (mach_is_hp6xx()) {
		u16 v = __raw_readw(HD64461_GPADR);
		v &= ~HD64461_GPADR_SPEAKER;
		__raw_writew(v, HD64461_GPADR);
	}

	sh_dac_enable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
}
static void dac_audio_stop(void)
{
	dac_audio_stop_timer();

	if (mach_is_hp6xx()) {
		u16 v = __raw_readw(HD64461_GPADR);
		v |= HD64461_GPADR_SPEAKER;
		__raw_writew(v, HD64461_GPADR);
	}

	sh_dac_output(0, CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
	sh_dac_disable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
}

static void dac_audio_set_rate(void)
{
	wakeups_per_second = ktime_set(0, 1000000000 / rate);
}

static int dac_audio_ioctl(struct inode *inode, struct file *file,
			   unsigned int cmd, unsigned long arg)
{
	int val;

	switch (cmd) {
	case OSS_GETVERSION:
		return put_user(SOUND_VERSION, (int *)arg);

	case SNDCTL_DSP_SYNC:
		dac_audio_sync();
		return 0;

	case SNDCTL_DSP_RESET:
		dac_audio_reset();
		return 0;

	case SNDCTL_DSP_GETFMTS:
		return put_user(AFMT_U8, (int *)arg);

	case SNDCTL_DSP_SETFMT:
		return put_user(AFMT_U8, (int *)arg);

	case SNDCTL_DSP_NONBLOCK:
		spin_lock(&file->f_lock);
		file->f_flags |= O_NONBLOCK;
		spin_unlock(&file->f_lock);
		return 0;

	case SNDCTL_DSP_GETCAPS:
		return 0;

	case SOUND_PCM_WRITE_RATE:
		val = *(int *)arg;
		if (val > 0) {
			rate = val;
			dac_audio_set_rate();
		}
		return put_user(rate, (int *)arg);

	case SNDCTL_DSP_STEREO:
		return put_user(0, (int *)arg);

	case SOUND_PCM_WRITE_CHANNELS:
		return put_user(1, (int *)arg);

	case SNDCTL_DSP_SETDUPLEX:
		return -EINVAL;

	case SNDCTL_DSP_PROFILE:
		return -EINVAL;

	case SNDCTL_DSP_GETBLKSIZE:
		return put_user(BUFFER_SIZE, (int *)arg);

	case SNDCTL_DSP_SETFRAGMENT:
		return 0;

	default:
		printk(KERN_ERR "sh_dac_audio: unimplemented ioctl=0x%x\n",
		       cmd);
		return -EINVAL;
	}
	return -EINVAL;
}

static ssize_t dac_audio_write(struct file *file, const char *buf, size_t count,
			       loff_t * ppos)
{
	int free;
	int nbytes;

	if (!count) {
		dac_audio_sync();
		return 0;
	}

	free = buffer_begin - buffer_end;

	if (free < 0)
		free += BUFFER_SIZE;
	if ((free == 0) && (empty))
		free = BUFFER_SIZE;
	if (count > free)
		count = free;
	if (buffer_begin > buffer_end) {
		if (copy_from_user((void *)buffer_end, buf, count))
			return -EFAULT;

		buffer_end += count;
	} else {
		nbytes = data_buffer + BUFFER_SIZE - buffer_end;
		if (nbytes > count) {
			if (copy_from_user((void *)buffer_end, buf, count))
				return -EFAULT;
			buffer_end += count;
		} else {
			if (copy_from_user((void *)buffer_end, buf, nbytes))
				return -EFAULT;
			if (copy_from_user
			    ((void *)data_buffer, buf + nbytes, count - nbytes))
				return -EFAULT;
			buffer_end = data_buffer + count - nbytes;
		}
	}

	if (empty) {
		empty = 0;
		dac_audio_start_timer();
	}

	return count;
}

static ssize_t dac_audio_read(struct file *file, char *buf, size_t count,
			      loff_t * ppos)
{
	return -EINVAL;
}

static int dac_audio_open(struct inode *inode, struct file *file)
{
	if (file->f_mode & FMODE_READ)
		return -ENODEV;
	if (in_use)
		return -EBUSY;

	in_use = 1;

	dac_audio_start();

	return 0;
}

static int dac_audio_release(struct inode *inode, struct file *file)
{
	dac_audio_sync();
	dac_audio_stop();
	in_use = 0;

	return 0;
}

const struct file_operations dac_audio_fops = {
      .read =		dac_audio_read,
      .write =	dac_audio_write,
      .ioctl =	dac_audio_ioctl,
      .open =		dac_audio_open,
      .release =	dac_audio_release,
};

static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle)
{
	if (!empty) {
		sh_dac_output(*buffer_begin, CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
		buffer_begin++;

		if (buffer_begin == data_buffer + BUFFER_SIZE)
			buffer_begin = data_buffer;
		if (buffer_begin == buffer_end)
			empty = 1;
	}

	if (!empty)
		hrtimer_start(&hrtimer, wakeups_per_second, HRTIMER_MODE_REL);

	return HRTIMER_NORESTART;
}

static int __init dac_audio_init(void)
{
	if ((device_major = register_sound_dsp(&dac_audio_fops, -1)) < 0) {
		printk(KERN_ERR "Cannot register dsp device");
		return device_major;
	}

	in_use = 0;

	data_buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL);
	if (data_buffer == NULL)
		return -ENOMEM;

	dac_audio_reset();
	rate = 8000;
	dac_audio_set_rate();

	/* Today: High Resolution Timer driven DAC playback.
	 * The timer callback gets called once per sample. Ouch.
	 *
	 * Future: A much better approach would be to use the
	 * SH7720 CMT+DMAC+DAC hardware combination like this:
	 * - Program sample rate using CMT0 or CMT1
	 * - Program DMAC to use CMT for timing and output to DAC
	 * - Play sound using DMAC, let CPU sleep.
	 * - While at it, rewrite this driver to use ALSA.
	 */

	hrtimer_init(&hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	hrtimer.function = sh_dac_audio_timer;

	return 0;
}

static void __exit dac_audio_exit(void)
{
	unregister_sound_dsp(device_major);
	kfree((void *)data_buffer);
}

module_init(dac_audio_init);
module_exit(dac_audio_exit);

MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
MODULE_DESCRIPTION("SH DAC sound driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
7e27b9b7 AS	1	/*
	2	* sound/oss/sh_dac_audio.c
	3	*
	4	* SH DAC based sound :(
	5	*
	6	* Copyright (C) 2004,2005 Andriy Skulysh
	7	*
	8	* This file is subject to the terms and conditions of the GNU General Public
	9	* License. See the file "COPYING" in the main directory of this archive
	10	* for more details.
	11	*/
1da177e4 LT	12	#include <linux/module.h>
	13	#include <linux/init.h>
	14	#include <linux/sched.h>
1da177e4 LT	15	#include <linux/linkage.h>
	16	#include <linux/slab.h>
	17	#include <linux/fs.h>
	18	#include <linux/sound.h>
	19	#include <linux/soundcard.h>
4bcac20a	20	#include <linux/interrupt.h>
639138a9	21	#include <linux/hrtimer.h>
1da177e4 LT	22	#include <asm/io.h>
	23	#include <asm/uaccess.h>
	24	#include <asm/irq.h>
	25	#include <asm/delay.h>
7e27b9b7	26	#include <asm/clock.h>
639138a9	27	#include <cpu/dac.h>
4bcac20a	28	#include <asm/machvec.h>
7639a454	29	#include <mach/hp6xx.h>
7e27b9b7	30	#include <asm/hd64461.h>
1da177e4 LT	31
	32	#define MODNAME "sh_dac_audio"
	33
1da177e4 LT	34	#define BUFFER_SIZE 48000
	35
	36	static int rate;
	37	static int empty;
	38	static char data_buffer, buffer_begin, *buffer_end;
	39	static int in_use, device_major;
639138a9 MD	40	static struct hrtimer hrtimer;
639138a9 MD	41	static ktime_t wakeups_per_second;
1da177e4 LT	42
	43	static void dac_audio_start_timer(void)
	44	{
639138a9	45	hrtimer_start(&hrtimer, wakeups_per_second, HRTIMER_MODE_REL);
1da177e4 LT	46	}
	47
	48	static void dac_audio_stop_timer(void)
	49	{
639138a9	50	hrtimer_cancel(&hrtimer);
1da177e4 LT	51	}
	52
	53	static void dac_audio_reset(void)
	54	{
	55	dac_audio_stop_timer();
	56	buffer_begin = buffer_end = data_buffer;
	57	empty = 1;
	58	}
	59
	60	static void dac_audio_sync(void)
	61	{
	62	while (!empty)
	63	schedule();
	64	}
	65
	66	static void dac_audio_start(void)
	67	{
4bcac20a	68	if (mach_is_hp6xx()) {
639138a9	69	u16 v = __raw_readw(HD64461_GPADR);
4bcac20a	70	v &= ~HD64461_GPADR_SPEAKER;
639138a9	71	__raw_writew(v, HD64461_GPADR);
4bcac20a AS	72	}
4bcac20a AS	73
1da177e4	74	sh_dac_enable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
1da177e4 LT	75	}
	76	static void dac_audio_stop(void)
	77	{
1da177e4	78	dac_audio_stop_timer();
4bcac20a AS	79
4bcac20a AS	80	if (mach_is_hp6xx()) {
639138a9	81	u16 v = __raw_readw(HD64461_GPADR);
4bcac20a	82	v \|= HD64461_GPADR_SPEAKER;
639138a9	83	__raw_writew(v, HD64461_GPADR);
4bcac20a AS	84	}
4bcac20a AS	85
639138a9	86	sh_dac_output(0, CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
1da177e4 LT	87	sh_dac_disable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
	88	}
	89
	90	static void dac_audio_set_rate(void)
	91	{
639138a9	92	wakeups_per_second = ktime_set(0, 1000000000 / rate);
1da177e4 LT	93	}
	94
	95	static int dac_audio_ioctl(struct inode inode, struct file file,
	96	unsigned int cmd, unsigned long arg)
	97	{
	98	int val;
	99
	100	switch (cmd) {
	101	case OSS_GETVERSION:
	102	return put_user(SOUND_VERSION, (int *)arg);
	103
	104	case SNDCTL_DSP_SYNC:
	105	dac_audio_sync();
	106	return 0;
	107
	108	case SNDCTL_DSP_RESET:
	109	dac_audio_reset();
	110	return 0;
	111
	112	case SNDCTL_DSP_GETFMTS:
	113	return put_user(AFMT_U8, (int *)arg);
	114
	115	case SNDCTL_DSP_SETFMT:
	116	return put_user(AFMT_U8, (int *)arg);
	117
	118	case SNDCTL_DSP_NONBLOCK:
db1dd4d3	119	spin_lock(&file->f_lock);
1da177e4	120	file->f_flags \|= O_NONBLOCK;
db1dd4d3	121	spin_unlock(&file->f_lock);
1da177e4 LT	122	return 0;
	123
	124	case SNDCTL_DSP_GETCAPS:
	125	return 0;
	126
	127	case SOUND_PCM_WRITE_RATE:
	128	val = (int )arg;
	129	if (val > 0) {
	130	rate = val;
	131	dac_audio_set_rate();
	132	}
	133	return put_user(rate, (int *)arg);
	134
	135	case SNDCTL_DSP_STEREO:
	136	return put_user(0, (int *)arg);
	137
	138	case SOUND_PCM_WRITE_CHANNELS:
	139	return put_user(1, (int *)arg);
	140
	141	case SNDCTL_DSP_SETDUPLEX:
	142	return -EINVAL;
	143
	144	case SNDCTL_DSP_PROFILE:
	145	return -EINVAL;
	146
	147	case SNDCTL_DSP_GETBLKSIZE:
	148	return put_user(BUFFER_SIZE, (int *)arg);
	149
	150	case SNDCTL_DSP_SETFRAGMENT:
	151	return 0;
	152
	153	default:
	154	printk(KERN_ERR "sh_dac_audio: unimplemented ioctl=0x%x\n",
	155	cmd);
	156	return -EINVAL;
	157	}
	158	return -EINVAL;
	159	}
	160
	161	static ssize_t dac_audio_write(struct file file, const char buf, size_t count,
	162	loff_t * ppos)
	163	{
	164	int free;
	165	int nbytes;
	166
1da177e4 LT	167	if (!count) {
	168	dac_audio_sync();
	169	return 0;
	170	}
	171
	172	free = buffer_begin - buffer_end;
	173
	174	if (free < 0)
	175	free += BUFFER_SIZE;
	176	if ((free == 0) && (empty))
	177	free = BUFFER_SIZE;
	178	if (count > free)
	179	count = free;
	180	if (buffer_begin > buffer_end) {
	181	if (copy_from_user((void *)buffer_end, buf, count))
	182	return -EFAULT;
	183
	184	buffer_end += count;
	185	} else {
	186	nbytes = data_buffer + BUFFER_SIZE - buffer_end;
	187	if (nbytes > count) {
	188	if (copy_from_user((void *)buffer_end, buf, count))
	189	return -EFAULT;
	190	buffer_end += count;
	191	} else {
	192	if (copy_from_user((void *)buffer_end, buf, nbytes))
	193	return -EFAULT;
	194	if (copy_from_user
	195	((void *)data_buffer, buf + nbytes, count - nbytes))
	196	return -EFAULT;
	197	buffer_end = data_buffer + count - nbytes;
	198	}
	199	}
	200
	201	if (empty) {
	202	empty = 0;
	203	dac_audio_start_timer();
	204	}
	205
	206	return count;
	207	}
	208
	209	static ssize_t dac_audio_read(struct file file, char buf, size_t count,
	210	loff_t * ppos)
	211	{
	212	return -EINVAL;
	213	}
	214
	215	static int dac_audio_open(struct inode inode, struct file file)
	216	{
	217	if (file->f_mode & FMODE_READ)
	218	return -ENODEV;
	219	if (in_use)
	220	return -EBUSY;
	221
	222	in_use = 1;
	223
	224	dac_audio_start();
	225
	226	return 0;
	227	}
	228
	229	static int dac_audio_release(struct inode inode, struct file file)
	230	{
231	dac_audio_sync();
232	dac_audio_stop();
233	in_use = 0;
234
235	return 0;
236	}
237
9c2e08c5	238	const struct file_operations dac_audio_fops = {
1da177e4 LT	239	.read = dac_audio_read,
	240	.write = dac_audio_write,
	241	.ioctl = dac_audio_ioctl,
	242	.open = dac_audio_open,
	243	.release = dac_audio_release,
	244	};
	245
639138a9	246	static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle)
1da177e4	247	{
1da177e4 LT	248	if (!empty) {
	249	sh_dac_output(*buffer_begin, CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
	250	buffer_begin++;
	251
	252	if (buffer_begin == data_buffer + BUFFER_SIZE)
	253	buffer_begin = data_buffer;
639138a9	254	if (buffer_begin == buffer_end)
1da177e4	255	empty = 1;
1da177e4	256	}
639138a9 MD	257
	258	if (!empty)
	259	hrtimer_start(&hrtimer, wakeups_per_second, HRTIMER_MODE_REL);
	260
	261	return HRTIMER_NORESTART;
1da177e4 LT	262	}
	263
	264	static int __init dac_audio_init(void)
	265	{
1da177e4 LT	266	if ((device_major = register_sound_dsp(&dac_audio_fops, -1)) < 0) {
	267	printk(KERN_ERR "Cannot register dsp device");
	268	return device_major;
	269	}
	270
	271	in_use = 0;
	272
4fa95ef6	273	data_buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL);
1da177e4 LT	274	if (data_buffer == NULL)
	275	return -ENOMEM;
	276
	277	dac_audio_reset();
	278	rate = 8000;
	279	dac_audio_set_rate();
	280
639138a9 MD	281	/* Today: High Resolution Timer driven DAC playback.
	282	* The timer callback gets called once per sample. Ouch.
	283	*
	284	* Future: A much better approach would be to use the
	285	* SH7720 CMT+DMAC+DAC hardware combination like this:
	286	* - Program sample rate using CMT0 or CMT1
	287	* - Program DMAC to use CMT for timing and output to DAC
	288	* - Play sound using DMAC, let CPU sleep.
	289	* - While at it, rewrite this driver to use ALSA.
	290	*/
	291
	292	hrtimer_init(&hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	293	hrtimer.function = sh_dac_audio_timer;
1da177e4 LT	294
	295	return 0;
	296	}
	297
	298	static void __exit dac_audio_exit(void)
	299	{
1da177e4 LT	300	unregister_sound_dsp(device_major);
	301	kfree((void *)data_buffer);
	302	}
	303
	304	module_init(dac_audio_init);
	305	module_exit(dac_audio_exit);
	306
	307	MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
	308	MODULE_DESCRIPTION("SH DAC sound driver");
	309	MODULE_LICENSE("GPL");