sound/oss/sh_dac_audio.c - kernel/msm-4.19 - Gitiles

 /*
  * 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 <asm/io.h>
 #include <asm/uaccess.h>
 #include <asm/irq.h>
 #include <asm/delay.h>
 #include <asm/clock.h>
 #include <asm/cpu/dac.h>
 #include <asm/cpu/timer.h>
 #include <asm/machvec.h>
 #include <mach/hp6xx.h>
 #include <asm/hd64461.h>

 #define MODNAME "sh_dac_audio"

 #define TMU_TOCR_INIT	0x00

 #define TMU1_TCR_INIT	0x0020	/* Clock/4, rising edge; interrupt on */
 #define TMU1_TSTR_INIT  0x02	/* Bit to turn on TMU1 */

 #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 void dac_audio_start_timer(void)
 {
 	u8 tstr;

 	tstr = ctrl_inb(TMU_TSTR);
 	tstr |= TMU1_TSTR_INIT;
 	ctrl_outb(tstr, TMU_TSTR);
 }

 static void dac_audio_stop_timer(void)
 {
 	u8 tstr;

 	tstr = ctrl_inb(TMU_TSTR);
 	tstr &= ~TMU1_TSTR_INIT;
 	ctrl_outb(tstr, TMU_TSTR);
 }

 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 = inw(HD64461_GPADR);
 		v &= ~HD64461_GPADR_SPEAKER;
 		outw(v, HD64461_GPADR);
 	}

 	sh_dac_enable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
 	ctrl_outw(TMU1_TCR_INIT, TMU1_TCR);
 }
 static void dac_audio_stop(void)
 {
 	dac_audio_stop_timer();

 	if (mach_is_hp6xx()) {
 		u16 v = inw(HD64461_GPADR);
 		v |= HD64461_GPADR_SPEAKER;
 		outw(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)
 {
 	unsigned long interval;
  	struct clk *clk;

  	clk = clk_get(NULL, "module_clk");
  	interval = (clk_get_rate(clk) / 4) / rate;
  	clk_put(clk);
 	ctrl_outl(interval, TMU1_TCOR);
 	ctrl_outl(interval, TMU1_TCNT);
 }

 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 < 0)
 		return -EINVAL;

 	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 irqreturn_t timer1_interrupt(int irq, void *dev)
 {
 	unsigned long timer_status;

 	timer_status = ctrl_inw(TMU1_TCR);
 	timer_status &= ~0x100;
 	ctrl_outw(timer_status, TMU1_TCR);

 	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;
 			dac_audio_stop_timer();
 		}
 	}
 	return IRQ_HANDLED;
 }

 static int __init dac_audio_init(void)
 {
 	int retval;

 	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();

 	retval =
 	    request_irq(TIMER1_IRQ, timer1_interrupt, IRQF_DISABLED, MODNAME, 0);
 	if (retval < 0) {
 		printk(KERN_ERR "sh_dac_audio: IRQ %d request failed\n",
 		       TIMER1_IRQ);
 		return retval;
 	}

 	return 0;
 }

 static void __exit dac_audio_exit(void)
 {
 	free_irq(TIMER1_IRQ, 0);

 	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");
	/*
	* 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 <asm/io.h>
	#include <asm/uaccess.h>
	#include <asm/irq.h>
	#include <asm/delay.h>
	#include <asm/clock.h>
	#include <asm/cpu/dac.h>
	#include <asm/cpu/timer.h>
	#include <asm/machvec.h>
	#include <mach/hp6xx.h>
	#include <asm/hd64461.h>

	#define MODNAME "sh_dac_audio"

	#define TMU_TOCR_INIT 0x00

	#define TMU1_TCR_INIT 0x0020 /* Clock/4, rising edge; interrupt on */
	#define TMU1_TSTR_INIT 0x02 /* Bit to turn on TMU1 */

	#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 void dac_audio_start_timer(void)
	{
	u8 tstr;

	tstr = ctrl_inb(TMU_TSTR);
	tstr \|= TMU1_TSTR_INIT;
	ctrl_outb(tstr, TMU_TSTR);
	}

	static void dac_audio_stop_timer(void)
	{
	u8 tstr;

	tstr = ctrl_inb(TMU_TSTR);
	tstr &= ~TMU1_TSTR_INIT;
	ctrl_outb(tstr, TMU_TSTR);
	}

	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 = inw(HD64461_GPADR);
	v &= ~HD64461_GPADR_SPEAKER;
	outw(v, HD64461_GPADR);
	}

	sh_dac_enable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
	ctrl_outw(TMU1_TCR_INIT, TMU1_TCR);
	}
	static void dac_audio_stop(void)
	{
	dac_audio_stop_timer();

	if (mach_is_hp6xx()) {
	u16 v = inw(HD64461_GPADR);
	v \|= HD64461_GPADR_SPEAKER;
	outw(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)
	{
	unsigned long interval;
	struct clk *clk;

	clk = clk_get(NULL, "module_clk");
	interval = (clk_get_rate(clk) / 4) / rate;
	clk_put(clk);
	ctrl_outl(interval, TMU1_TCOR);
	ctrl_outl(interval, TMU1_TCNT);
	}

	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 < 0)
	return -EINVAL;

	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 irqreturn_t timer1_interrupt(int irq, void *dev)
	{
	unsigned long timer_status;

	timer_status = ctrl_inw(TMU1_TCR);
	timer_status &= ~0x100;
	ctrl_outw(timer_status, TMU1_TCR);

	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;
	dac_audio_stop_timer();
	}
	}
	return IRQ_HANDLED;
	}

	static int __init dac_audio_init(void)
	{
	int retval;

	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();

	retval =
	request_irq(TIMER1_IRQ, timer1_interrupt, IRQF_DISABLED, MODNAME, 0);
	if (retval < 0) {
	printk(KERN_ERR "sh_dac_audio: IRQ %d request failed\n",
	TIMER1_IRQ);
	return retval;
	}

	return 0;
	}

	static void __exit dac_audio_exit(void)
	{
	free_irq(TIMER1_IRQ, 0);

	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");