[net-next-2.6.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/smp_lock.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 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 long dac_audio_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
{
	int ret;

	lock_kernel();
	ret = dac_audio_ioctl(file, cmd, arg);
	unlock_kernel();

	return ret;
}

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;

	lock_kernel();
	if (in_use) {
		unlock_kernel();
		return -EBUSY;
	}

	in_use = 1;

	dac_audio_start();
	unlock_kernel();
	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,
      .unlocked_ioctl =	dac_audio_unlocked_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>
90dc763f	19	#include <linux/smp_lock.h>
1da177e4	20	#include <linux/soundcard.h>
4bcac20a	21	#include <linux/interrupt.h>
639138a9	22	#include <linux/hrtimer.h>
1da177e4 LT	23	#include <asm/io.h>
	24	#include <asm/uaccess.h>
	25	#include <asm/irq.h>
	26	#include <asm/delay.h>
7e27b9b7	27	#include <asm/clock.h>
639138a9	28	#include <cpu/dac.h>
4bcac20a	29	#include <asm/machvec.h>
7639a454	30	#include <mach/hp6xx.h>
7e27b9b7	31	#include <asm/hd64461.h>
1da177e4 LT	32
	33	#define MODNAME "sh_dac_audio"
	34
1da177e4 LT	35	#define BUFFER_SIZE 48000
	36
	37	static int rate;
	38	static int empty;
	39	static char data_buffer, buffer_begin, *buffer_end;
	40	static int in_use, device_major;
639138a9 MD	41	static struct hrtimer hrtimer;
639138a9 MD	42	static ktime_t wakeups_per_second;
1da177e4 LT	43
	44	static void dac_audio_start_timer(void)
	45	{
639138a9	46	hrtimer_start(&hrtimer, wakeups_per_second, HRTIMER_MODE_REL);
1da177e4 LT	47	}
	48
	49	static void dac_audio_stop_timer(void)
	50	{
639138a9	51	hrtimer_cancel(&hrtimer);
1da177e4 LT	52	}
	53
	54	static void dac_audio_reset(void)
	55	{
	56	dac_audio_stop_timer();
	57	buffer_begin = buffer_end = data_buffer;
	58	empty = 1;
	59	}
	60
	61	static void dac_audio_sync(void)
	62	{
	63	while (!empty)
	64	schedule();
	65	}
	66
	67	static void dac_audio_start(void)
	68	{
4bcac20a	69	if (mach_is_hp6xx()) {
639138a9	70	u16 v = __raw_readw(HD64461_GPADR);
4bcac20a	71	v &= ~HD64461_GPADR_SPEAKER;
639138a9	72	__raw_writew(v, HD64461_GPADR);
4bcac20a AS	73	}
4bcac20a AS	74
1da177e4	75	sh_dac_enable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
1da177e4 LT	76	}
	77	static void dac_audio_stop(void)
	78	{
1da177e4	79	dac_audio_stop_timer();
4bcac20a AS	80
4bcac20a AS	81	if (mach_is_hp6xx()) {
639138a9	82	u16 v = __raw_readw(HD64461_GPADR);
4bcac20a	83	v \|= HD64461_GPADR_SPEAKER;
639138a9	84	__raw_writew(v, HD64461_GPADR);
4bcac20a AS	85	}
4bcac20a AS	86
639138a9	87	sh_dac_output(0, CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
1da177e4 LT	88	sh_dac_disable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
	89	}
	90
	91	static void dac_audio_set_rate(void)
	92	{
639138a9	93	wakeups_per_second = ktime_set(0, 1000000000 / rate);
1da177e4 LT	94	}
1da177e4 LT	95
d209974c	96	static int dac_audio_ioctl(struct file *file,
1da177e4 LT	97	unsigned int cmd, unsigned long arg)
	98	{
	99	int val;
	100
	101	switch (cmd) {
	102	case OSS_GETVERSION:
	103	return put_user(SOUND_VERSION, (int *)arg);
	104
	105	case SNDCTL_DSP_SYNC:
	106	dac_audio_sync();
	107	return 0;
	108
	109	case SNDCTL_DSP_RESET:
	110	dac_audio_reset();
	111	return 0;
	112
	113	case SNDCTL_DSP_GETFMTS:
	114	return put_user(AFMT_U8, (int *)arg);
	115
	116	case SNDCTL_DSP_SETFMT:
	117	return put_user(AFMT_U8, (int *)arg);
	118
	119	case SNDCTL_DSP_NONBLOCK:
db1dd4d3	120	spin_lock(&file->f_lock);
1da177e4	121	file->f_flags \|= O_NONBLOCK;
db1dd4d3	122	spin_unlock(&file->f_lock);
1da177e4 LT	123	return 0;
	124
	125	case SNDCTL_DSP_GETCAPS:
	126	return 0;
	127
	128	case SOUND_PCM_WRITE_RATE:
	129	val = (int )arg;
	130	if (val > 0) {
	131	rate = val;
	132	dac_audio_set_rate();
	133	}
	134	return put_user(rate, (int *)arg);
	135
	136	case SNDCTL_DSP_STEREO:
	137	return put_user(0, (int *)arg);
	138
	139	case SOUND_PCM_WRITE_CHANNELS:
	140	return put_user(1, (int *)arg);
	141
	142	case SNDCTL_DSP_SETDUPLEX:
	143	return -EINVAL;
	144
	145	case SNDCTL_DSP_PROFILE:
	146	return -EINVAL;
	147
	148	case SNDCTL_DSP_GETBLKSIZE:
	149	return put_user(BUFFER_SIZE, (int *)arg);
	150
	151	case SNDCTL_DSP_SETFRAGMENT:
	152	return 0;
	153
	154	default:
	155	printk(KERN_ERR "sh_dac_audio: unimplemented ioctl=0x%x\n",
	156	cmd);
	157	return -EINVAL;
	158	}
	159	return -EINVAL;
	160	}
	161
d209974c AB	162	static long dac_audio_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
	163	{
	164	int ret;
	165
	166	lock_kernel();
	167	ret = dac_audio_ioctl(file, cmd, arg);
	168	unlock_kernel();
	169
	170	return ret;
	171	}
	172
1da177e4 LT	173	static ssize_t dac_audio_write(struct file file, const char buf, size_t count,
	174	loff_t * ppos)
	175	{
	176	int free;
	177	int nbytes;
	178
1da177e4 LT	179	if (!count) {
	180	dac_audio_sync();
	181	return 0;
	182	}
	183
	184	free = buffer_begin - buffer_end;
	185
	186	if (free < 0)
	187	free += BUFFER_SIZE;
	188	if ((free == 0) && (empty))
	189	free = BUFFER_SIZE;
	190	if (count > free)
	191	count = free;
	192	if (buffer_begin > buffer_end) {
	193	if (copy_from_user((void *)buffer_end, buf, count))
	194	return -EFAULT;
	195
	196	buffer_end += count;
	197	} else {
	198	nbytes = data_buffer + BUFFER_SIZE - buffer_end;
	199	if (nbytes > count) {
	200	if (copy_from_user((void *)buffer_end, buf, count))
	201	return -EFAULT;
	202	buffer_end += count;
	203	} else {
	204	if (copy_from_user((void *)buffer_end, buf, nbytes))
	205	return -EFAULT;
	206	if (copy_from_user
	207	((void *)data_buffer, buf + nbytes, count - nbytes))
	208	return -EFAULT;
	209	buffer_end = data_buffer + count - nbytes;
	210	}
	211	}
	212
	213	if (empty) {
	214	empty = 0;
	215	dac_audio_start_timer();
	216	}
	217
	218	return count;
	219	}
	220
	221	static ssize_t dac_audio_read(struct file file, char buf, size_t count,
	222	loff_t * ppos)
	223	{
	224	return -EINVAL;
	225	}
	226
	227	static int dac_audio_open(struct inode inode, struct file file)
	228	{
	229	if (file->f_mode & FMODE_READ)
	230	return -ENODEV;
90dc763f AB	231
	232	lock_kernel();
	233	if (in_use) {
	234	unlock_kernel();
1da177e4	235	return -EBUSY;
90dc763f	236	}
1da177e4 LT	237
	238	in_use = 1;
	239
	240	dac_audio_start();
90dc763f	241	unlock_kernel();
1da177e4 LT	242	return 0;
	243	}
	244
	245	static int dac_audio_release(struct inode inode, struct file file)
	246	{
	247	dac_audio_sync();
	248	dac_audio_stop();
	249	in_use = 0;
	250
	251	return 0;
	252	}
	253
9c2e08c5	254	const struct file_operations dac_audio_fops = {
1da177e4	255	.read = dac_audio_read,
d209974c AB	256	.write = dac_audio_write,
d209974c AB	257	.unlocked_ioctl = dac_audio_unlocked_ioctl,
1da177e4 LT	258	.open = dac_audio_open,
	259	.release = dac_audio_release,
	260	};
	261
639138a9	262	static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle)
1da177e4	263	{
1da177e4 LT	264	if (!empty) {
	265	sh_dac_output(*buffer_begin, CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
	266	buffer_begin++;
	267
	268	if (buffer_begin == data_buffer + BUFFER_SIZE)
	269	buffer_begin = data_buffer;
639138a9	270	if (buffer_begin == buffer_end)
1da177e4	271	empty = 1;
1da177e4	272	}
639138a9 MD	273
	274	if (!empty)
	275	hrtimer_start(&hrtimer, wakeups_per_second, HRTIMER_MODE_REL);
	276
	277	return HRTIMER_NORESTART;
1da177e4 LT	278	}
	279
	280	static int __init dac_audio_init(void)
	281	{
1da177e4 LT	282	if ((device_major = register_sound_dsp(&dac_audio_fops, -1)) < 0) {
	283	printk(KERN_ERR "Cannot register dsp device");
	284	return device_major;
	285	}
	286
	287	in_use = 0;
	288
4fa95ef6	289	data_buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL);
1da177e4 LT	290	if (data_buffer == NULL)
	291	return -ENOMEM;
	292
	293	dac_audio_reset();
	294	rate = 8000;
	295	dac_audio_set_rate();
	296
639138a9 MD	297	/* Today: High Resolution Timer driven DAC playback.
	298	* The timer callback gets called once per sample. Ouch.
	299	*
	300	* Future: A much better approach would be to use the
	301	* SH7720 CMT+DMAC+DAC hardware combination like this:
	302	* - Program sample rate using CMT0 or CMT1
	303	* - Program DMAC to use CMT for timing and output to DAC
	304	* - Play sound using DMAC, let CPU sleep.
	305	* - While at it, rewrite this driver to use ALSA.
	306	*/
	307
	308	hrtimer_init(&hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	309	hrtimer.function = sh_dac_audio_timer;
1da177e4 LT	310
	311	return 0;
	312	}
	313
	314	static void __exit dac_audio_exit(void)
	315	{
1da177e4 LT	316	unregister_sound_dsp(device_major);
	317	kfree((void *)data_buffer);
	318	}
	319
	320	module_init(dac_audio_init);
	321	module_exit(dac_audio_exit);
	322
	323	MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
	324	MODULE_DESCRIPTION("SH DAC sound driver");
	325	MODULE_LICENSE("GPL");