[PATCH] sh: DAC ODD driver

From: Paul Mundt <lethal@linux-sh.org>

SuperH DAC OSS driver.

sound/oss/Kconfig

@@ -1153,3 +1153,11 @@ config SOUND_AD1980
 	tristate "AD1980 front/back switch plugin"
 	depends on SOUND_PRIME!=n
 
+config SOUND_SH_DAC_AUDIO
+	tristate "SuperH DAC audio support"
+	depends on SOUND_PRIME!=n && SOUND && CPU_SH3
+
+config SOUND_SH_DAC_AUDIO_CHANNEL
+	int "    DAC channel"
+	default "1"
+	depends on SOUND_SH_DAC_AUDIO

sound/oss/Makefile

@@ -10,6 +10,7 @@ obj-$(CONFIG_SOUND_CS4232)	+= cs4232.o ad1848.o
 
 # Please leave it as is, cause the link order is significant !
 
+obj-$(CONFIG_SOUND_SH_DAC_AUDIO)	+= sh_dac_audio.o
 obj-$(CONFIG_SOUND_HAL2)	+= hal2.o
 obj-$(CONFIG_SOUND_AEDSP16)	+= aedsp16.o
 obj-$(CONFIG_SOUND_PSS)		+= pss.o ad1848.o mpu401.o

sound/oss/sh_dac_audio.c

+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/version.h>
+#include <linux/linkage.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/sound.h>
+#include <linux/soundcard.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/irq.h>
+#include <asm/delay.h>
+#include <linux/interrupt.h>
+
+#include <asm/cpu/dac.h>
+
+#ifdef MACH_HP600
+#include <asm/hp6xx/hp6xx.h>
+#include <asm/hd64461/hd64461.h>
+#endif
+
+#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 TMU_TSTR	0xfffffe92
+#define TMU1_TCOR	0xfffffea0
+#define TMU1_TCNT	0xfffffea4
+#define TMU1_TCR	0xfffffea8
+
+#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)
+{
+#ifdef MACH_HP600
+	u16 v;
+	v = inw(HD64461_GPADR);
+	v &= ~HD64461_GPADR_SPEAKER;
+	outw(v, HD64461_GPADR);
+#endif
+	sh_dac_enable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
+	ctrl_outw(TMU1_TCR_INIT, TMU1_TCR);
+}
+static void dac_audio_stop(void)
+{
+#ifdef MACH_HP600
+	u16 v;
+#endif
+	dac_audio_stop_timer();
+#ifdef MACH_HP600
+	v = inw(HD64461_GPADR);
+	v |= HD64461_GPADR_SPEAKER;
+	outw(v, HD64461_GPADR);
+#endif
+	sh_dac_disable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
+}
+
+static void dac_audio_set_rate(void)
+{
+	unsigned long interval;
+
+	interval = (current_cpu_data.module_clock / 4) / rate;
+	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:
+		file->f_flags |= O_NONBLOCK;
+		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;
+}
+
+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, struct pt_regs *regs)
+{
+	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 = (char *)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, SA_INTERRUPT, 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");