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/init.h>
  26 #include <linux/slab.h>
  27 #include <linux/version.h>
  28 #include <media/v4l2-dev.h>
  29 #include <media/v4l2-ioctl.h>
  30 #include <sound/tea575x-tuner.h>
  31
  32 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  33 MODULE_DESCRIPTION("Routines for control of TEA5757/5759 Philips AM/FM radio tuner chips");
  34 MODULE_LICENSE("GPL");
  35
  36 static int radio_nr = -1;
  37 module_param(radio_nr, int, 0);
  38
  39 #define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
  40 #define FREQ_LO          (50UL * 16000)
  41 #define FREQ_HI         (150UL * 16000)
  42
  43 /*
  44  * definitions
  45  */
  46
  47 #define TEA575X_BIT_SEARCH      (1<<24)         /* 1 = search action, 0 = tuned */
  48 #define TEA575X_BIT_UPDOWN      (1<<23)         /* 0 = search down, 1 = search up */
  49 #define TEA575X_BIT_MONO        (1<<22)         /* 0 = stereo, 1 = mono */
  50 #define TEA575X_BIT_BAND_MASK   (3<<20)
  51 #define TEA575X_BIT_BAND_FM     (0<<20)
  52 #define TEA575X_BIT_BAND_MW     (1<<20)
  53 #define TEA575X_BIT_BAND_LW     (1<<21)
  54 #define TEA575X_BIT_BAND_SW     (1<<22)
  55 #define TEA575X_BIT_PORT_0      (1<<19)         /* user bit */
  56 #define TEA575X_BIT_PORT_1      (1<<18)         /* user bit */
  57 #define TEA575X_BIT_SEARCH_MASK (3<<16)         /* search level */
  58 #define TEA575X_BIT_SEARCH_5_28      (0<<16)    /* FM >5uV, AM >28uV */
  59 #define TEA575X_BIT_SEARCH_10_40     (1<<16)    /* FM >10uV, AM > 40uV */
  60 #define TEA575X_BIT_SEARCH_30_63     (2<<16)    /* FM >30uV, AM > 63uV */
  61 #define TEA575X_BIT_SEARCH_150_1000  (3<<16)    /* FM > 150uV, AM > 1000uV */
  62 #define TEA575X_BIT_DUMMY       (1<<15)         /* buffer */
  63 #define TEA575X_BIT_FREQ_MASK   0x7fff
  64
  65 /*
  66  * lowlevel part
  67  */
  68
  69 static void snd_tea575x_write(struct snd_tea575x *tea, unsigned int val)
  70 {
  71         u16 l;
  72         u8 data;
  73
  74         tea->ops->set_direction(tea, 1);
  75         udelay(16);
  76
  77         for (l = 25; l > 0; l--) {
  78                 data = (val >> 24) & TEA575X_DATA;
  79                 val <<= 1;                      /* shift data */
  80                 tea->ops->set_pins(tea, data | TEA575X_WREN);
  81                 udelay(2);
  82                 tea->ops->set_pins(tea, data | TEA575X_WREN | TEA575X_CLK);
  83                 udelay(2);
  84                 tea->ops->set_pins(tea, data | TEA575X_WREN);
  85                 udelay(2);
  86         }
  87
  88         if (!tea->mute)
  89                 tea->ops->set_pins(tea, 0);
  90 }
  91
  92 static unsigned int snd_tea575x_read(struct snd_tea575x *tea)
  93 {
  94         u16 l, rdata;
  95         u32 data = 0;
  96
  97         tea->ops->set_direction(tea, 0);
  98         tea->ops->set_pins(tea, 0);
  99         udelay(16);
 100
 101         for (l = 24; l--;) {
 102                 tea->ops->set_pins(tea, TEA575X_CLK);
 103                 udelay(2);
 104                 if (!l)
 105                         tea->tuned = tea->ops->get_pins(tea) & TEA575X_MOST ? 0 : 1;
 106                 tea->ops->set_pins(tea, 0);
 107                 udelay(2);
 108                 data <<= 1;                     /* shift data */
 109                 rdata = tea->ops->get_pins(tea);
 110                 if (!l)
 111                         tea->stereo = (rdata & TEA575X_MOST) ?  0 : 1;
 112                 if (rdata & TEA575X_DATA)
 113                         data++;
 114                 udelay(2);
 115         }
 116
 117         if (tea->mute)
 118                 tea->ops->set_pins(tea, TEA575X_WREN);
 119
 120         return data;
 121 }
 122
 123 static void snd_tea575x_get_freq(struct snd_tea575x *tea)
 124 {
 125         unsigned long freq;
 126
 127         freq = snd_tea575x_read(tea) & TEA575X_BIT_FREQ_MASK;
 128         /* freq *= 12.5 */
 129         freq *= 125;
 130         freq /= 10;
 131         /* crystal fixup */
 132         if (tea->tea5759)
 133                 freq += TEA575X_FMIF;
 134         else
 135                 freq -= TEA575X_FMIF;
 136
 137         tea->freq = freq * 16;          /* from kHz */
 138 }
 139
 140 static void snd_tea575x_set_freq(struct snd_tea575x *tea)
 141 {
 142         unsigned long freq;
 143
 144         freq = clamp(tea->freq, FREQ_LO, FREQ_HI);
 145         freq /= 16;             /* to kHz */
 146         /* crystal fixup */
 147         if (tea->tea5759)
 148                 freq -= TEA575X_FMIF;
 149         else
 150                 freq += TEA575X_FMIF;
 151         /* freq /= 12.5 */
 152         freq *= 10;
 153         freq /= 125;
 154
 155         tea->val &= ~TEA575X_BIT_FREQ_MASK;
 156         tea->val |= freq & TEA575X_BIT_FREQ_MASK;
 157         snd_tea575x_write(tea, tea->val);
 158 }
 159
 160 /*
 161  * Linux Video interface
 162  */
 163
 164 static int vidioc_querycap(struct file *file, void  *priv,
 165                                         struct v4l2_capability *v)
 166 {
 167         struct snd_tea575x *tea = video_drvdata(file);
 168
 169         strlcpy(v->driver, "tea575x-tuner", sizeof(v->driver));
 170         strlcpy(v->card, tea->card, sizeof(v->card));
 171         strlcat(v->card, tea->tea5759 ? " TEA5759" : " TEA5757", sizeof(v->card));
 172         strlcpy(v->bus_info, tea->bus_info, sizeof(v->bus_info));
 173         v->version = RADIO_VERSION;
 174         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 175         return 0;
 176 }
 177
 178 static int vidioc_g_tuner(struct file *file, void *priv,
 179                                         struct v4l2_tuner *v)
 180 {
 181         struct snd_tea575x *tea = video_drvdata(file);
 182
 183         if (v->index > 0)
 184                 return -EINVAL;
 185
 186         snd_tea575x_read(tea);
 187
 188         strcpy(v->name, "FM");
 189         v->type = V4L2_TUNER_RADIO;
 190         v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
 191         v->rangelow = FREQ_LO;
 192         v->rangehigh = FREQ_HI;
 193         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 194         v->audmode = tea->stereo ? V4L2_TUNER_MODE_STEREO : V4L2_TUNER_MODE_MONO;
 195         v->signal = tea->tuned ? 0xffff : 0;
 196
 197         return 0;
 198 }
 199
 200 static int vidioc_s_tuner(struct file *file, void *priv,
 201                                         struct v4l2_tuner *v)
 202 {
 203         if (v->index > 0)
 204                 return -EINVAL;
 205         return 0;
 206 }
 207
 208 static int vidioc_g_frequency(struct file *file, void *priv,
 209                                         struct v4l2_frequency *f)
 210 {
 211         struct snd_tea575x *tea = video_drvdata(file);
 212
 213         if (f->tuner != 0)
 214                 return -EINVAL;
 215         f->type = V4L2_TUNER_RADIO;
 216         snd_tea575x_get_freq(tea);
 217         f->frequency = tea->freq;
 218         return 0;
 219 }
 220
 221 static int vidioc_s_frequency(struct file *file, void *priv,
 222                                         struct v4l2_frequency *f)
 223 {
 224         struct snd_tea575x *tea = video_drvdata(file);
 225
 226         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 227                 return -EINVAL;
 228
 229         if (f->frequency < FREQ_LO || f->frequency > FREQ_HI)
 230                 return -EINVAL;
 231
 232         tea->freq = f->frequency;
 233
 234         snd_tea575x_set_freq(tea);
 235
 236         return 0;
 237 }
 238
 239 static int vidioc_g_audio(struct file *file, void *priv,
 240                                         struct v4l2_audio *a)
 241 {
 242         if (a->index > 1)
 243                 return -EINVAL;
 244
 245         strcpy(a->name, "Radio");
 246         a->capability = V4L2_AUDCAP_STEREO;
 247         return 0;
 248 }
 249
 250 static int vidioc_s_audio(struct file *file, void *priv,
 251                                         struct v4l2_audio *a)
 252 {
 253         if (a->index != 0)
 254                 return -EINVAL;
 255         return 0;
 256 }
 257
 258 static int tea575x_s_ctrl(struct v4l2_ctrl *ctrl)
 259 {
 260         struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler);
 261
 262         switch (ctrl->id) {
 263         case V4L2_CID_AUDIO_MUTE:
 264                 tea->mute = ctrl->val;
 265                 snd_tea575x_set_freq(tea);
 266                 return 0;
 267         }
 268
 269         return -EINVAL;
 270 }
 271
 272 static const struct v4l2_file_operations tea575x_fops = {
 273         .owner          = THIS_MODULE,
 274         .unlocked_ioctl = video_ioctl2,
 275 };
 276
 277 static const struct v4l2_ioctl_ops tea575x_ioctl_ops = {
 278         .vidioc_querycap    = vidioc_querycap,
 279         .vidioc_g_tuner     = vidioc_g_tuner,
 280         .vidioc_s_tuner     = vidioc_s_tuner,
 281         .vidioc_g_audio     = vidioc_g_audio,
 282         .vidioc_s_audio     = vidioc_s_audio,
 283         .vidioc_g_frequency = vidioc_g_frequency,
 284         .vidioc_s_frequency = vidioc_s_frequency,
 285 };
 286
 287 static struct video_device tea575x_radio = {
 288         .name           = "tea575x-tuner",
 289         .fops           = &tea575x_fops,
 290         .ioctl_ops      = &tea575x_ioctl_ops,
 291         .release        = video_device_release_empty,
 292 };
 293
 294 static const struct v4l2_ctrl_ops tea575x_ctrl_ops = {
 295         .s_ctrl = tea575x_s_ctrl,
 296 };
 297
 298 /*
 299  * initialize all the tea575x chips
 300  */
 301 int snd_tea575x_init(struct snd_tea575x *tea)
 302 {
 303         int retval;
 304
 305         tea->mute = 1;
 306
 307         snd_tea575x_write(tea, 0x55AA);
 308         if (snd_tea575x_read(tea) != 0x55AA)
 309                 return -ENODEV;
 310
 311         tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_10_40;
 312         tea->freq = 90500 * 16;         /* 90.5Mhz default */
 313         snd_tea575x_set_freq(tea);
 314
 315         tea->vd = tea575x_radio;
 316         video_set_drvdata(&tea->vd, tea);
 317         mutex_init(&tea->mutex);
 318         tea->vd.lock = &tea->mutex;
 319
 320         v4l2_ctrl_handler_init(&tea->ctrl_handler, 1);
 321         tea->vd.ctrl_handler = &tea->ctrl_handler;
 322         v4l2_ctrl_new_std(&tea->ctrl_handler, &tea575x_ctrl_ops, V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 323         retval = tea->ctrl_handler.error;
 324         if (retval) {
 325                 printk(KERN_ERR "tea575x-tuner: can't initialize controls\n");
 326                 v4l2_ctrl_handler_free(&tea->ctrl_handler);
 327                 return retval;
 328         }
 329
 330         if (tea->ext_init) {
 331                 retval = tea->ext_init(tea);
 332                 if (retval) {
 333                         v4l2_ctrl_handler_free(&tea->ctrl_handler);
 334                         return retval;
 335                 }
 336         }
 337
 338         v4l2_ctrl_handler_setup(&tea->ctrl_handler);
 339
 340         retval = video_register_device(&tea->vd, VFL_TYPE_RADIO, radio_nr);
 341         if (retval) {
 342                 printk(KERN_ERR "tea575x-tuner: can't register video device!\n");
 343                 v4l2_ctrl_handler_free(&tea->ctrl_handler);
 344                 return retval;
 345         }
 346
 347         return 0;
 348 }
 349
 350 void snd_tea575x_exit(struct snd_tea575x *tea)
 351 {
 352         video_unregister_device(&tea->vd);
 353         v4l2_ctrl_handler_free(&tea->ctrl_handler);
 354 }
 355
 356 static int __init alsa_tea575x_module_init(void)
 357 {
 358         return 0;
 359 }
 360
 361 static void __exit alsa_tea575x_module_exit(void)
 362 {
 363 }
 364
 365 module_init(alsa_tea575x_module_init)
 366 module_exit(alsa_tea575x_module_exit)
 367
 368 EXPORT_SYMBOL(snd_tea575x_init);
 369 EXPORT_SYMBOL(snd_tea575x_exit);