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 <sound/driver.h>
  24 #include <asm/io.h>
  25 #include <linux/delay.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/init.h>
  28 #include <sound/core.h>
  29 #include <sound/tea575x-tuner.h>
  30
  31 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  32 MODULE_DESCRIPTION("Routines for control of TEA5757/5759 Philips AM/FM radio tuner chips");
  33 MODULE_LICENSE("GPL");
  34
  35 /*
  36  * definitions
  37  */
  38
  39 #define TEA575X_BIT_SEARCH      (1<<24)         /* 1 = search action, 0 = tuned */
  40 #define TEA575X_BIT_UPDOWN      (1<<23)         /* 0 = search down, 1 = search up */
  41 #define TEA575X_BIT_MONO        (1<<22)         /* 0 = stereo, 1 = mono */
  42 #define TEA575X_BIT_BAND_MASK   (3<<20)
  43 #define TEA575X_BIT_BAND_FM     (0<<20)
  44 #define TEA575X_BIT_BAND_MW     (1<<20)
  45 #define TEA575X_BIT_BAND_LW     (1<<21)
  46 #define TEA575X_BIT_BAND_SW     (1<<22)
  47 #define TEA575X_BIT_PORT_0      (1<<19)         /* user bit */
  48 #define TEA575X_BIT_PORT_1      (1<<18)         /* user bit */
  49 #define TEA575X_BIT_SEARCH_MASK (3<<16)         /* search level */
  50 #define TEA575X_BIT_SEARCH_5_28      (0<<16)    /* FM >5uV, AM >28uV */
  51 #define TEA575X_BIT_SEARCH_10_40     (1<<16)    /* FM >10uV, AM > 40uV */
  52 #define TEA575X_BIT_SEARCH_30_63     (2<<16)    /* FM >30uV, AM > 63uV */
  53 #define TEA575X_BIT_SEARCH_150_1000  (3<<16)    /* FM > 150uV, AM > 1000uV */
  54 #define TEA575X_BIT_DUMMY       (1<<15)         /* buffer */
  55 #define TEA575X_BIT_FREQ_MASK   0x7fff
  56
  57 /*
  58  * lowlevel part
  59  */
  60
  61 static void snd_tea575x_set_freq(struct snd_tea575x *tea)
  62 {
  63         unsigned long freq;
  64
  65         freq = tea->freq / 16;          /* to kHz */
  66         if (freq > 108000)
  67                 freq = 108000;
  68         if (freq < 87000)
  69                 freq = 87000;
  70         /* crystal fixup */
  71         if (tea->tea5759)
  72                 freq -= tea->freq_fixup;
  73         else
  74                 freq += tea->freq_fixup;
  75         /* freq /= 12.5 */
  76         freq *= 10;
  77         freq /= 125;
  78
  79         tea->val &= ~TEA575X_BIT_FREQ_MASK;
  80         tea->val |= freq & TEA575X_BIT_FREQ_MASK;
  81         tea->ops->write(tea, tea->val);
  82 }
  83
  84 /*
  85  * Linux Video interface
  86  */
  87
  88 static int snd_tea575x_ioctl(struct inode *inode, struct file *file,
  89                              unsigned int cmd, unsigned long data)
  90 {
  91         struct video_device *dev = video_devdata(file);
  92         struct snd_tea575x *tea = video_get_drvdata(dev);
  93         void __user *arg = (void __user *)data;
  94
  95         switch(cmd) {
  96                 case VIDIOCGCAP:
  97                 {
  98                         struct video_capability v;
  99                         v.type = VID_TYPE_TUNER;
 100                         v.channels = 1;
 101                         v.audios = 1;
 102                         /* No we don't do pictures */
 103                         v.maxwidth = 0;
 104                         v.maxheight = 0;
 105                         v.minwidth = 0;
 106                         v.minheight = 0;
 107                         strcpy(v.name, tea->tea5759 ? "TEA5759" : "TEA5757");
 108                         if (copy_to_user(arg,&v,sizeof(v)))
 109                                 return -EFAULT;
 110                         return 0;
 111                 }
 112                 case VIDIOCGTUNER:
 113                 {
 114                         struct video_tuner v;
 115                         if (copy_from_user(&v, arg,sizeof(v))!=0)
 116                                 return -EFAULT;
 117                         if (v.tuner)    /* Only 1 tuner */
 118                                 return -EINVAL;
 119                         v.rangelow = (87*16000);
 120                         v.rangehigh = (108*16000);
 121                         v.flags = VIDEO_TUNER_LOW;
 122                         v.mode = VIDEO_MODE_AUTO;
 123                         strcpy(v.name, "FM");
 124                         v.signal = 0xFFFF;
 125                         if (copy_to_user(arg, &v, sizeof(v)))
 126                                 return -EFAULT;
 127                         return 0;
 128                 }
 129                 case VIDIOCSTUNER:
 130                 {
 131                         struct video_tuner v;
 132                         if(copy_from_user(&v, arg, sizeof(v)))
 133                                 return -EFAULT;
 134                         if(v.tuner!=0)
 135                                 return -EINVAL;
 136                         /* Only 1 tuner so no setting needed ! */
 137                         return 0;
 138                 }
 139                 case VIDIOCGFREQ:
 140                         if(copy_to_user(arg, &tea->freq, sizeof(tea->freq)))
 141                                 return -EFAULT;
 142                         return 0;
 143                 case VIDIOCSFREQ:
 144                         if(copy_from_user(&tea->freq, arg, sizeof(tea->freq)))
 145                                 return -EFAULT;
 146                         snd_tea575x_set_freq(tea);
 147                         return 0;
 148                 case VIDIOCGAUDIO:
 149                 {
 150                         struct video_audio v;
 151                         memset(&v, 0, sizeof(v));
 152                         strcpy(v.name, "Radio");
 153                         if(copy_to_user(arg,&v, sizeof(v)))
 154                                 return -EFAULT;
 155                         return 0;
 156                 }
 157                 case VIDIOCSAUDIO:
 158                 {
 159                         struct video_audio v;
 160                         if(copy_from_user(&v, arg, sizeof(v)))
 161                                 return -EFAULT;
 162                         if(v.audio)
 163                                 return -EINVAL;
 164                         return 0;
 165                 }
 166                 default:
 167                         return -ENOIOCTLCMD;
 168         }
 169 }
 170
 171 static void snd_tea575x_release(struct video_device *vfd)
 172 {
 173 }
 174
 175 /*
 176  * initialize all the tea575x chips
 177  */
 178 void snd_tea575x_init(struct snd_tea575x *tea)
 179 {
 180         unsigned int val;
 181
 182         val = tea->ops->read(tea);
 183         if (val == 0x1ffffff || val == 0) {
 184                 snd_printk(KERN_ERR "Cannot find TEA575x chip\n");
 185                 return;
 186         }
 187
 188         memset(&tea->vd, 0, sizeof(tea->vd));
 189         tea->vd.owner = tea->card->module;
 190         strcpy(tea->vd.name, tea->tea5759 ? "TEA5759 radio" : "TEA5757 radio");
 191         tea->vd.type = VID_TYPE_TUNER;
 192         tea->vd.release = snd_tea575x_release;
 193         video_set_drvdata(&tea->vd, tea);
 194         tea->vd.fops = &tea->fops;
 195         tea->fops.owner = tea->card->module;
 196         tea->fops.open = video_exclusive_open;
 197         tea->fops.release = video_exclusive_release;
 198         tea->fops.ioctl = snd_tea575x_ioctl;
 199         if (video_register_device(&tea->vd, VFL_TYPE_RADIO, tea->dev_nr - 1) < 0) {
 200                 snd_printk(KERN_ERR "unable to register tea575x tuner\n");
 201                 return;
 202         }
 203         tea->vd_registered = 1;
 204
 205         tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_10_40;
 206         tea->freq = 90500 * 16;         /* 90.5Mhz default */
 207
 208         snd_tea575x_set_freq(tea);
 209 }
 210
 211 void snd_tea575x_exit(struct snd_tea575x *tea)
 212 {
 213         if (tea->vd_registered) {
 214                 video_unregister_device(&tea->vd);
 215                 tea->vd_registered = 0;
 216         }
 217 }
 218
 219 static int __init alsa_tea575x_module_init(void)
 220 {
 221         return 0;
 222 }
 223
 224 static void __exit alsa_tea575x_module_exit(void)
 225 {
 226 }
 227
 228 module_init(alsa_tea575x_module_init)
 229 module_exit(alsa_tea575x_module_exit)
 230
 231 EXPORT_SYMBOL(snd_tea575x_init);
 232 EXPORT_SYMBOL(snd_tea575x_exit);