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/module.h>
  26 #include <linux/init.h>
  27 #include <linux/slab.h>
  28 #include <linux/sched.h>
  29 #include <media/v4l2-device.h>
  30 #include <media/v4l2-dev.h>
  31 #include <media/v4l2-fh.h>
  32 #include <media/v4l2-ioctl.h>
  33 #include <media/v4l2-event.h>
  34 #include <sound/tea575x-tuner.h>
  35
  36 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  37 MODULE_DESCRIPTION("Routines for control of TEA5757/5759 Philips AM/FM radio tuner chips");
  38 MODULE_LICENSE("GPL");
  39
  40 #define FREQ_LO         ((tea->tea5759 ? 760 :  875) * 1600U)
  41 #define FREQ_HI         ((tea->tea5759 ? 910 : 1080) * 1600U)
  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 u32 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 u32 snd_tea575x_get_freq(struct snd_tea575x *tea)
 124 {
 125         u32 freq = snd_tea575x_read(tea) & TEA575X_BIT_FREQ_MASK;
 126
 127         if (freq == 0)
 128                 return freq;
 129
 130         /* freq *= 12.5 */
 131         freq *= 125;
 132         freq /= 10;
 133         /* crystal fixup */
 134         if (tea->tea5759)
 135                 freq += TEA575X_FMIF;
 136         else
 137                 freq -= TEA575X_FMIF;
 138
 139         return clamp(freq * 16, FREQ_LO, FREQ_HI); /* from kHz */
 140 }
 141
 142 static void snd_tea575x_set_freq(struct snd_tea575x *tea)
 143 {
 144         u32 freq = tea->freq;
 145
 146         freq /= 16;             /* to kHz */
 147         /* crystal fixup */
 148         if (tea->tea5759)
 149                 freq -= TEA575X_FMIF;
 150         else
 151                 freq += TEA575X_FMIF;
 152         /* freq /= 12.5 */
 153         freq *= 10;
 154         freq /= 125;
 155
 156         tea->val &= ~TEA575X_BIT_FREQ_MASK;
 157         tea->val |= freq & TEA575X_BIT_FREQ_MASK;
 158         snd_tea575x_write(tea, tea->val);
 159 }
 160
 161 /*
 162  * Linux Video interface
 163  */
 164
 165 static int vidioc_querycap(struct file *file, void  *priv,
 166                                         struct v4l2_capability *v)
 167 {
 168         struct snd_tea575x *tea = video_drvdata(file);
 169
 170         strlcpy(v->driver, tea->v4l2_dev->name, sizeof(v->driver));
 171         strlcpy(v->card, tea->card, sizeof(v->card));
 172         strlcat(v->card, tea->tea5759 ? " TEA5759" : " TEA5757", sizeof(v->card));
 173         strlcpy(v->bus_info, tea->bus_info, sizeof(v->bus_info));
 174         v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 175         if (!tea->cannot_read_data)
 176                 v->device_caps |= V4L2_CAP_HW_FREQ_SEEK;
 177         v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
 178         return 0;
 179 }
 180
 181 static int vidioc_g_tuner(struct file *file, void *priv,
 182                                         struct v4l2_tuner *v)
 183 {
 184         struct snd_tea575x *tea = video_drvdata(file);
 185
 186         if (v->index > 0)
 187                 return -EINVAL;
 188
 189         snd_tea575x_read(tea);
 190
 191         strcpy(v->name, "FM");
 192         v->type = V4L2_TUNER_RADIO;
 193         v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
 194         v->rangelow = FREQ_LO;
 195         v->rangehigh = FREQ_HI;
 196         v->rxsubchans = tea->stereo ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
 197         v->audmode = (tea->val & TEA575X_BIT_MONO) ?
 198                 V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO;
 199         v->signal = tea->tuned ? 0xffff : 0;
 200         return 0;
 201 }
 202
 203 static int vidioc_s_tuner(struct file *file, void *priv,
 204                                         struct v4l2_tuner *v)
 205 {
 206         struct snd_tea575x *tea = video_drvdata(file);
 207
 208         if (v->index)
 209                 return -EINVAL;
 210         tea->val &= ~TEA575X_BIT_MONO;
 211         if (v->audmode == V4L2_TUNER_MODE_MONO)
 212                 tea->val |= TEA575X_BIT_MONO;
 213         snd_tea575x_write(tea, tea->val);
 214         return 0;
 215 }
 216
 217 static int vidioc_g_frequency(struct file *file, void *priv,
 218                                         struct v4l2_frequency *f)
 219 {
 220         struct snd_tea575x *tea = video_drvdata(file);
 221
 222         if (f->tuner != 0)
 223                 return -EINVAL;
 224         f->type = V4L2_TUNER_RADIO;
 225         f->frequency = tea->freq;
 226         return 0;
 227 }
 228
 229 static int vidioc_s_frequency(struct file *file, void *priv,
 230                                         struct v4l2_frequency *f)
 231 {
 232         struct snd_tea575x *tea = video_drvdata(file);
 233
 234         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 235                 return -EINVAL;
 236
 237         tea->val &= ~TEA575X_BIT_SEARCH;
 238         tea->freq = clamp(f->frequency, FREQ_LO, FREQ_HI);
 239         snd_tea575x_set_freq(tea);
 240         return 0;
 241 }
 242
 243 static int vidioc_s_hw_freq_seek(struct file *file, void *fh,
 244                                         struct v4l2_hw_freq_seek *a)
 245 {
 246         struct snd_tea575x *tea = video_drvdata(file);
 247         unsigned long timeout;
 248         int i;
 249
 250         if (tea->cannot_read_data)
 251                 return -ENOTTY;
 252         if (a->tuner || a->wrap_around)
 253                 return -EINVAL;
 254
 255         /* clear the frequency, HW will fill it in */
 256         tea->val &= ~TEA575X_BIT_FREQ_MASK;
 257         tea->val |= TEA575X_BIT_SEARCH;
 258         if (a->seek_upward)
 259                 tea->val |= TEA575X_BIT_UPDOWN;
 260         else
 261                 tea->val &= ~TEA575X_BIT_UPDOWN;
 262         snd_tea575x_write(tea, tea->val);
 263         timeout = jiffies + msecs_to_jiffies(10000);
 264         for (;;) {
 265                 if (time_after(jiffies, timeout))
 266                         break;
 267                 if (schedule_timeout_interruptible(msecs_to_jiffies(10))) {
 268                         /* some signal arrived, stop search */
 269                         tea->val &= ~TEA575X_BIT_SEARCH;
 270                         snd_tea575x_set_freq(tea);
 271                         return -ERESTARTSYS;
 272                 }
 273                 if (!(snd_tea575x_read(tea) & TEA575X_BIT_SEARCH)) {
 274                         u32 freq;
 275
 276                         /* Found a frequency, wait until it can be read */
 277                         for (i = 0; i < 100; i++) {
 278                                 msleep(10);
 279                                 freq = snd_tea575x_get_freq(tea);
 280                                 if (freq) /* available */
 281                                         break;
 282                         }
 283                         if (freq == 0) /* shouldn't happen */
 284                                 break;
 285                         /*
 286                          * if we moved by less than 50 kHz, or in the wrong
 287                          * direction, continue seeking
 288                          */
 289                         if (abs(tea->freq - freq) < 16 * 50 ||
 290                                         (a->seek_upward && freq < tea->freq) ||
 291                                         (!a->seek_upward && freq > tea->freq)) {
 292                                 snd_tea575x_write(tea, tea->val);
 293                                 continue;
 294                         }
 295                         tea->freq = freq;
 296                         tea->val &= ~TEA575X_BIT_SEARCH;
 297                         return 0;
 298                 }
 299         }
 300         tea->val &= ~TEA575X_BIT_SEARCH;
 301         snd_tea575x_set_freq(tea);
 302         return -EAGAIN;
 303 }
 304
 305 static int tea575x_s_ctrl(struct v4l2_ctrl *ctrl)
 306 {
 307         struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler);
 308
 309         switch (ctrl->id) {
 310         case V4L2_CID_AUDIO_MUTE:
 311                 tea->mute = ctrl->val;
 312                 snd_tea575x_set_freq(tea);
 313                 return 0;
 314         }
 315
 316         return -EINVAL;
 317 }
 318
 319 static const struct v4l2_file_operations tea575x_fops = {
 320         .unlocked_ioctl = video_ioctl2,
 321         .open           = v4l2_fh_open,
 322         .release        = v4l2_fh_release,
 323         .poll           = v4l2_ctrl_poll,
 324 };
 325
 326 static const struct v4l2_ioctl_ops tea575x_ioctl_ops = {
 327         .vidioc_querycap    = vidioc_querycap,
 328         .vidioc_g_tuner     = vidioc_g_tuner,
 329         .vidioc_s_tuner     = vidioc_s_tuner,
 330         .vidioc_g_frequency = vidioc_g_frequency,
 331         .vidioc_s_frequency = vidioc_s_frequency,
 332         .vidioc_s_hw_freq_seek = vidioc_s_hw_freq_seek,
 333         .vidioc_log_status  = v4l2_ctrl_log_status,
 334         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
 335         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 336 };
 337
 338 static const struct video_device tea575x_radio = {
 339         .ioctl_ops      = &tea575x_ioctl_ops,
 340         .release        = video_device_release_empty,
 341 };
 342
 343 static const struct v4l2_ctrl_ops tea575x_ctrl_ops = {
 344         .s_ctrl = tea575x_s_ctrl,
 345 };
 346
 347 /*
 348  * initialize all the tea575x chips
 349  */
 350 int snd_tea575x_init(struct snd_tea575x *tea, struct module *owner)
 351 {
 352         int retval;
 353
 354         tea->mute = true;
 355
 356         /* Not all devices can or know how to read the data back.
 357            Such devices can set cannot_read_data to true. */
 358         if (!tea->cannot_read_data) {
 359                 snd_tea575x_write(tea, 0x55AA);
 360                 if (snd_tea575x_read(tea) != 0x55AA)
 361                         return -ENODEV;
 362         }
 363
 364         tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_5_28;
 365         tea->freq = 90500 * 16;         /* 90.5Mhz default */
 366         snd_tea575x_set_freq(tea);
 367
 368         tea->vd = tea575x_radio;
 369         video_set_drvdata(&tea->vd, tea);
 370         mutex_init(&tea->mutex);
 371         strlcpy(tea->vd.name, tea->v4l2_dev->name, sizeof(tea->vd.name));
 372         tea->vd.lock = &tea->mutex;
 373         tea->vd.v4l2_dev = tea->v4l2_dev;
 374         tea->vd.ctrl_handler = &tea->ctrl_handler;
 375         tea->fops = tea575x_fops;
 376         tea->fops.owner = owner;
 377         tea->vd.fops = &tea->fops;
 378         set_bit(V4L2_FL_USE_FH_PRIO, &tea->vd.flags);
 379         /* disable hw_freq_seek if we can't use it */
 380         if (tea->cannot_read_data)
 381                 v4l2_disable_ioctl(&tea->vd, VIDIOC_S_HW_FREQ_SEEK);
 382
 383         v4l2_ctrl_handler_init(&tea->ctrl_handler, 1);
 384         v4l2_ctrl_new_std(&tea->ctrl_handler, &tea575x_ctrl_ops, V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 385         retval = tea->ctrl_handler.error;
 386         if (retval) {
 387                 v4l2_err(tea->v4l2_dev, "can't initialize controls\n");
 388                 v4l2_ctrl_handler_free(&tea->ctrl_handler);
 389                 return retval;
 390         }
 391
 392         if (tea->ext_init) {
 393                 retval = tea->ext_init(tea);
 394                 if (retval) {
 395                         v4l2_ctrl_handler_free(&tea->ctrl_handler);
 396                         return retval;
 397                 }
 398         }
 399
 400         v4l2_ctrl_handler_setup(&tea->ctrl_handler);
 401
 402         retval = video_register_device(&tea->vd, VFL_TYPE_RADIO, tea->radio_nr);
 403         if (retval) {
 404                 v4l2_err(tea->v4l2_dev, "can't register video device!\n");
 405                 v4l2_ctrl_handler_free(&tea->ctrl_handler);
 406                 return retval;
 407         }
 408
 409         return 0;
 410 }
 411
 412 void snd_tea575x_exit(struct snd_tea575x *tea)
 413 {
 414         video_unregister_device(&tea->vd);
 415         v4l2_ctrl_handler_free(&tea->ctrl_handler);
 416 }
 417
 418 static int __init alsa_tea575x_module_init(void)
 419 {
 420         return 0;
 421 }
 422
 423 static void __exit alsa_tea575x_module_exit(void)
 424 {
 425 }
 426
 427 module_init(alsa_tea575x_module_init)
 428 module_exit(alsa_tea575x_module_exit)
 429
 430 EXPORT_SYMBOL(snd_tea575x_init);
 431 EXPORT_SYMBOL(snd_tea575x_exit);