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linux-sg2042/sound/i2c/other/tea575x-tuner.c

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/*
* ALSA driver for TEA5757/5759 Philips AM/FM radio tuner chips
*
* Copyright (c) 2004 Jaroslav Kysela <perex@suse.cz>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <sound/driver.h>
#include <asm/io.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <sound/core.h>
#include <sound/tea575x-tuner.h>
MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
MODULE_DESCRIPTION("Routines for control of TEA5757/5759 Philips AM/FM radio tuner chips");
MODULE_LICENSE("GPL");
/*
* definitions
*/
#define TEA575X_BIT_SEARCH (1<<24) /* 1 = search action, 0 = tuned */
#define TEA575X_BIT_UPDOWN (1<<23) /* 0 = search down, 1 = search up */
#define TEA575X_BIT_MONO (1<<22) /* 0 = stereo, 1 = mono */
#define TEA575X_BIT_BAND_MASK (3<<20)
#define TEA575X_BIT_BAND_FM (0<<20)
#define TEA575X_BIT_BAND_MW (1<<20)
#define TEA575X_BIT_BAND_LW (1<<21)
#define TEA575X_BIT_BAND_SW (1<<22)
#define TEA575X_BIT_PORT_0 (1<<19) /* user bit */
#define TEA575X_BIT_PORT_1 (1<<18) /* user bit */
#define TEA575X_BIT_SEARCH_MASK (3<<16) /* search level */
#define TEA575X_BIT_SEARCH_5_28 (0<<16) /* FM >5uV, AM >28uV */
#define TEA575X_BIT_SEARCH_10_40 (1<<16) /* FM >10uV, AM > 40uV */
#define TEA575X_BIT_SEARCH_30_63 (2<<16) /* FM >30uV, AM > 63uV */
#define TEA575X_BIT_SEARCH_150_1000 (3<<16) /* FM > 150uV, AM > 1000uV */
#define TEA575X_BIT_DUMMY (1<<15) /* buffer */
#define TEA575X_BIT_FREQ_MASK 0x7fff
/*
* lowlevel part
*/
static void snd_tea575x_set_freq(struct snd_tea575x *tea)
{
unsigned long freq;
freq = tea->freq / 16; /* to kHz */
if (freq > 108000)
freq = 108000;
if (freq < 87000)
freq = 87000;
/* crystal fixup */
if (tea->tea5759)
freq -= tea->freq_fixup;
else
freq += tea->freq_fixup;
/* freq /= 12.5 */
freq *= 10;
freq /= 125;
tea->val &= ~TEA575X_BIT_FREQ_MASK;
tea->val |= freq & TEA575X_BIT_FREQ_MASK;
tea->ops->write(tea, tea->val);
}
/*
* Linux Video interface
*/
static int snd_tea575x_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long data)
{
struct video_device *dev = video_devdata(file);
struct snd_tea575x *tea = video_get_drvdata(dev);
void __user *arg = (void __user *)data;
switch(cmd) {
case VIDIOCGCAP:
{
struct video_capability v;
v.type = VID_TYPE_TUNER;
v.channels = 1;
v.audios = 1;
/* No we don't do pictures */
v.maxwidth = 0;
v.maxheight = 0;
v.minwidth = 0;
v.minheight = 0;
strcpy(v.name, tea->tea5759 ? "TEA5759" : "TEA5757");
if (copy_to_user(arg,&v,sizeof(v)))
return -EFAULT;
return 0;
}
case VIDIOCGTUNER:
{
struct video_tuner v;
if (copy_from_user(&v, arg,sizeof(v))!=0)
return -EFAULT;
if (v.tuner) /* Only 1 tuner */
return -EINVAL;
v.rangelow = (87*16000);
v.rangehigh = (108*16000);
v.flags = VIDEO_TUNER_LOW;
v.mode = VIDEO_MODE_AUTO;
strcpy(v.name, "FM");
v.signal = 0xFFFF;
if (copy_to_user(arg, &v, sizeof(v)))
return -EFAULT;
return 0;
}
case VIDIOCSTUNER:
{
struct video_tuner v;
if(copy_from_user(&v, arg, sizeof(v)))
return -EFAULT;
if(v.tuner!=0)
return -EINVAL;
/* Only 1 tuner so no setting needed ! */
return 0;
}
case VIDIOCGFREQ:
if(copy_to_user(arg, &tea->freq, sizeof(tea->freq)))
return -EFAULT;
return 0;
case VIDIOCSFREQ:
if(copy_from_user(&tea->freq, arg, sizeof(tea->freq)))
return -EFAULT;
snd_tea575x_set_freq(tea);
return 0;
case VIDIOCGAUDIO:
{
struct video_audio v;
memset(&v, 0, sizeof(v));
strcpy(v.name, "Radio");
if(copy_to_user(arg,&v, sizeof(v)))
return -EFAULT;
return 0;
}
case VIDIOCSAUDIO:
{
struct video_audio v;
if(copy_from_user(&v, arg, sizeof(v)))
return -EFAULT;
if(v.audio)
return -EINVAL;
return 0;
}
default:
return -ENOIOCTLCMD;
}
}
static void snd_tea575x_release(struct video_device *vfd)
{
}
/*
* initialize all the tea575x chips
*/
void snd_tea575x_init(struct snd_tea575x *tea)
{
unsigned int val;
val = tea->ops->read(tea);
if (val == 0x1ffffff || val == 0) {
snd_printk(KERN_ERR "Cannot find TEA575x chip\n");
return;
}
memset(&tea->vd, 0, sizeof(tea->vd));
tea->vd.owner = tea->card->module;
strcpy(tea->vd.name, tea->tea5759 ? "TEA5759 radio" : "TEA5757 radio");
tea->vd.type = VID_TYPE_TUNER;
tea->vd.hardware = VID_HARDWARE_RTRACK; /* FIXME: assign new number */
tea->vd.release = snd_tea575x_release;
video_set_drvdata(&tea->vd, tea);
tea->vd.fops = &tea->fops;
tea->fops.owner = tea->card->module;
tea->fops.open = video_exclusive_open;
tea->fops.release = video_exclusive_release;
tea->fops.ioctl = snd_tea575x_ioctl;
if (video_register_device(&tea->vd, VFL_TYPE_RADIO, tea->dev_nr - 1) < 0) {
snd_printk(KERN_ERR "unable to register tea575x tuner\n");
return;
}
tea->vd_registered = 1;
tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_10_40;
tea->freq = 90500 * 16; /* 90.5Mhz default */
snd_tea575x_set_freq(tea);
}
void snd_tea575x_exit(struct snd_tea575x *tea)
{
if (tea->vd_registered) {
video_unregister_device(&tea->vd);
tea->vd_registered = 0;
}
}
static int __init alsa_tea575x_module_init(void)
{
return 0;
}
static void __exit alsa_tea575x_module_exit(void)
{
}
module_init(alsa_tea575x_module_init)
module_exit(alsa_tea575x_module_exit)
EXPORT_SYMBOL(snd_tea575x_init);
EXPORT_SYMBOL(snd_tea575x_exit);
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