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

   1/*
   2 *   ALSA driver for TEA5757/5759 Philips AM/FM radio tuner chips
   3 *
   4 *      Copyright (c) 2004 Jaroslav Kysela <perex@perex.cz>
   5 *
   6 *
   7 *   This program is free software; you can redistribute it and/or modify
   8 *   it under the terms of the GNU General Public License as published by
   9 *   the Free Software Foundation; either version 2 of the License, or
  10 *   (at your option) any later version.
  11 *
  12 *   This program is distributed in the hope that it will be useful,
  13 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 *   GNU General Public License for more details.
  16 *
  17 *   You should have received a copy of the GNU General Public License
  18 *   along with this program; if not, write to the Free Software
  19 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  20 *
  21 */      
  22
  23#include <asm/io.h>
  24#include <linux/delay.h>
  25#include <linux/interrupt.h>
  26#include <linux/init.h>
  27#include <sound/core.h>
  28#include <sound/tea575x-tuner.h>
  29
  30MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  31MODULE_DESCRIPTION("Routines for control of TEA5757/5759 Philips AM/FM radio tuner chips");
  32MODULE_LICENSE("GPL");
  33
  34/*
  35 * definitions
  36 */
  37
  38#define TEA575X_BIT_SEARCH      (1<<24)         /* 1 = search action, 0 = tuned */
  39#define TEA575X_BIT_UPDOWN      (1<<23)         /* 0 = search down, 1 = search up */
  40#define TEA575X_BIT_MONO        (1<<22)         /* 0 = stereo, 1 = mono */
  41#define TEA575X_BIT_BAND_MASK   (3<<20)
  42#define TEA575X_BIT_BAND_FM     (0<<20)
  43#define TEA575X_BIT_BAND_MW     (1<<20)
  44#define TEA575X_BIT_BAND_LW     (1<<21)
  45#define TEA575X_BIT_BAND_SW     (1<<22)
  46#define TEA575X_BIT_PORT_0      (1<<19)         /* user bit */
  47#define TEA575X_BIT_PORT_1      (1<<18)         /* user bit */
  48#define TEA575X_BIT_SEARCH_MASK (3<<16)         /* search level */
  49#define TEA575X_BIT_SEARCH_5_28      (0<<16)    /* FM >5uV, AM >28uV */
  50#define TEA575X_BIT_SEARCH_10_40     (1<<16)    /* FM >10uV, AM > 40uV */
  51#define TEA575X_BIT_SEARCH_30_63     (2<<16)    /* FM >30uV, AM > 63uV */
  52#define TEA575X_BIT_SEARCH_150_1000  (3<<16)    /* FM > 150uV, AM > 1000uV */
  53#define TEA575X_BIT_DUMMY       (1<<15)         /* buffer */
  54#define TEA575X_BIT_FREQ_MASK   0x7fff
  55
  56/*
  57 * lowlevel part
  58 */
  59
  60static void snd_tea575x_set_freq(struct snd_tea575x *tea)
  61{
  62        unsigned long freq;
  63
  64        freq = tea->freq / 16;          /* to kHz */
  65        if (freq > 108000)
  66                freq = 108000;
  67        if (freq < 87000)
  68                freq = 87000;
  69        /* crystal fixup */
  70        if (tea->tea5759)
  71                freq -= tea->freq_fixup;
  72        else
  73                freq += tea->freq_fixup;
  74        /* freq /= 12.5 */
  75        freq *= 10;
  76        freq /= 125;
  77
  78        tea->val &= ~TEA575X_BIT_FREQ_MASK;
  79        tea->val |= freq & TEA575X_BIT_FREQ_MASK;
  80        tea->ops->write(tea, tea->val);
  81}
  82
  83/*
  84 * Linux Video interface
  85 */
  86
  87static int snd_tea575x_ioctl(struct inode *inode, struct file *file,
  88                             unsigned int cmd, unsigned long data)
  89{
  90        struct video_device *dev = video_devdata(file);
  91        struct snd_tea575x *tea = video_get_drvdata(dev);
  92        void __user *arg = (void __user *)data;
  93        
  94        switch(cmd) {
  95                case VIDIOCGCAP:
  96                {
  97                        struct video_capability v;
  98                        v.type = VID_TYPE_TUNER;
  99                        v.channels = 1;
 100                        v.audios = 1;
 101                        /* No we don't do pictures */
 102                        v.maxwidth = 0;
 103                        v.maxheight = 0;
 104                        v.minwidth = 0;
 105                        v.minheight = 0;
 106                        strcpy(v.name, tea->tea5759 ? "TEA5759" : "TEA5757");
 107                        if (copy_to_user(arg,&v,sizeof(v)))
 108                                return -EFAULT;
 109                        return 0;
 110                }
 111                case VIDIOCGTUNER:
 112                {
 113                        struct video_tuner v;
 114                        if (copy_from_user(&v, arg,sizeof(v))!=0) 
 115                                return -EFAULT;
 116                        if (v.tuner)    /* Only 1 tuner */ 
 117                                return -EINVAL;
 118                        v.rangelow = (87*16000);
 119                        v.rangehigh = (108*16000);
 120                        v.flags = VIDEO_TUNER_LOW;
 121                        v.mode = VIDEO_MODE_AUTO;
 122                        strcpy(v.name, "FM");
 123                        v.signal = 0xFFFF;
 124                        if (copy_to_user(arg, &v, sizeof(v)))
 125                                return -EFAULT;
 126                        return 0;
 127                }
 128                case VIDIOCSTUNER:
 129                {
 130                        struct video_tuner v;
 131                        if(copy_from_user(&v, arg, sizeof(v)))
 132                                return -EFAULT;
 133                        if(v.tuner!=0)
 134                                return -EINVAL;
 135                        /* Only 1 tuner so no setting needed ! */
 136                        return 0;
 137                }
 138                case VIDIOCGFREQ:
 139                        if(copy_to_user(arg, &tea->freq, sizeof(tea->freq)))
 140                                return -EFAULT;
 141                        return 0;
 142                case VIDIOCSFREQ:
 143                        if(copy_from_user(&tea->freq, arg, sizeof(tea->freq)))
 144                                return -EFAULT;
 145                        snd_tea575x_set_freq(tea);
 146                        return 0;
 147                case VIDIOCGAUDIO:
 148                {       
 149                        struct video_audio v;
 150                        memset(&v, 0, sizeof(v));
 151                        strcpy(v.name, "Radio");
 152                        if(copy_to_user(arg,&v, sizeof(v)))
 153                                return -EFAULT;
 154                        return 0;                       
 155                }
 156                case VIDIOCSAUDIO:
 157                {
 158                        struct video_audio v;
 159                        if(copy_from_user(&v, arg, sizeof(v))) 
 160                                return -EFAULT; 
 161                        if (tea->ops->mute)
 162                                tea->ops->mute(tea,
 163                                               (v.flags &
 164                                                VIDEO_AUDIO_MUTE) ? 1 : 0);
 165                        if(v.audio) 
 166                                return -EINVAL;
 167                        return 0;
 168                }
 169                default:
 170                        return -ENOIOCTLCMD;
 171        }
 172}
 173
 174static void snd_tea575x_release(struct video_device *vfd)
 175{
 176}
 177
 178/*
 179 * initialize all the tea575x chips
 180 */
 181void snd_tea575x_init(struct snd_tea575x *tea)
 182{
 183        unsigned int val;
 184
 185        val = tea->ops->read(tea);
 186        if (val == 0x1ffffff || val == 0) {
 187                snd_printk(KERN_ERR "Cannot find TEA575x chip\n");
 188                return;
 189        }
 190
 191        memset(&tea->vd, 0, sizeof(tea->vd));
 192        strcpy(tea->vd.name, tea->tea5759 ? "TEA5759 radio" : "TEA5757 radio");
 193        tea->vd.release = snd_tea575x_release;
 194        video_set_drvdata(&tea->vd, tea);
 195        tea->vd.fops = &tea->fops;
 196        tea->fops.owner = tea->card->module;
 197        tea->fops.open = video_exclusive_open;
 198        tea->fops.release = video_exclusive_release;
 199        tea->fops.ioctl = snd_tea575x_ioctl;
 200        if (video_register_device(&tea->vd, VFL_TYPE_RADIO, tea->dev_nr - 1) < 0) {
 201                snd_printk(KERN_ERR "unable to register tea575x tuner\n");
 202                return;
 203        }
 204        tea->vd_registered = 1;
 205
 206        tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_10_40;
 207        tea->freq = 90500 * 16;         /* 90.5Mhz default */
 208
 209        snd_tea575x_set_freq(tea);
 210
 211        /* mute on init */
 212        if (tea->ops->mute)
 213                tea->ops->mute(tea, 1);
 214}
 215
 216void snd_tea575x_exit(struct snd_tea575x *tea)
 217{
 218        if (tea->vd_registered) {
 219                video_unregister_device(&tea->vd);
 220                tea->vd_registered = 0;
 221        }
 222}
 223
 224static int __init alsa_tea575x_module_init(void)
 225{
 226        return 0;
 227}
 228        
 229static void __exit alsa_tea575x_module_exit(void)
 230{
 231}
 232        
 233module_init(alsa_tea575x_module_init)
 234module_exit(alsa_tea575x_module_exit)
 235
 236EXPORT_SYMBOL(snd_tea575x_init);
 237EXPORT_SYMBOL(snd_tea575x_exit);
 238