drivers/media/video/wm8739.c

   1 /*
   2  * wm8739
   3  *
   4  * Copyright (C) 2005 T. Adachi <tadachi@tadachi-net.com>
   5  *
   6  * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
   7  * - Cleanup
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/types.h>
  26 #include <linux/ioctl.h>
  27 #include <asm/uaccess.h>
  28 #include <linux/i2c.h>
  29 #include <linux/i2c-id.h>
  30 #include <linux/videodev.h>
  31 #include <media/v4l2-common.h>
  32
  33 MODULE_DESCRIPTION("wm8739 driver");
  34 MODULE_AUTHOR("T. Adachi, Hans Verkuil");
  35 MODULE_LICENSE("GPL");
  36
  37 static int debug = 0;
  38 static unsigned short normal_i2c[] = { 0x34 >> 1, 0x36 >> 1, I2C_CLIENT_END };
  39
  40 module_param(debug, int, 0644);
  41
  42 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  43
  44
  45 I2C_CLIENT_INSMOD;
  46
  47 /* ------------------------------------------------------------------------ */
  48
  49 enum {
  50         R0 = 0, R1,
  51         R5 = 5, R6, R7, R8, R9, R15 = 15,
  52         TOT_REGS
  53 };
  54
  55 struct wm8739_state {
  56         u32 clock_freq;
  57         u8 muted;
  58         u16 volume;
  59         u16 balance;
  60         u8 vol_l;               /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
  61         u8 vol_r;               /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
  62 };
  63
  64 /* ------------------------------------------------------------------------ */
  65
  66 static int wm8739_write(struct i2c_client *client, int reg, u16 val)
  67 {
  68         int i;
  69
  70         if (reg < 0 || reg >= TOT_REGS) {
  71                 v4l_err(client, "Invalid register R%d\n", reg);
  72                 return -1;
  73         }
  74
  75         v4l_dbg(1, debug, client, "write: %02x %02x\n", reg, val);
  76
  77         for (i = 0; i < 3; i++) {
  78                 if (i2c_smbus_write_byte_data(client, (reg << 1) |
  79                                         (val >> 8), val & 0xff) == 0) {
  80                         return 0;
  81                 }
  82         }
  83         v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
  84         return -1;
  85 }
  86
  87 /* write regs to set audio volume etc */
  88 static void wm8739_set_audio(struct i2c_client *client)
  89 {
  90         struct wm8739_state *state = i2c_get_clientdata(client);
  91         u16 mute = state->muted ? 0x80 : 0;
  92
  93         /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
  94          * Default setting: 0x17 = 0 dB
  95          */
  96         wm8739_write(client, R0, (state->vol_l & 0x1f) | mute);
  97         wm8739_write(client, R1, (state->vol_r & 0x1f) | mute);
  98 }
  99
 100 static int wm8739_get_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
 101 {
 102         struct wm8739_state *state = i2c_get_clientdata(client);
 103
 104         switch (ctrl->id) {
 105         case V4L2_CID_AUDIO_MUTE:
 106                 ctrl->value = state->muted;
 107                 break;
 108
 109         case V4L2_CID_AUDIO_VOLUME:
 110                 ctrl->value = state->volume;
 111                 break;
 112
 113         case V4L2_CID_AUDIO_BALANCE:
 114                 ctrl->value = state->balance;
 115                 break;
 116
 117         default:
 118                 return -EINVAL;
 119         }
 120         return 0;
 121 }
 122
 123 static int wm8739_set_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
 124 {
 125         struct wm8739_state *state = i2c_get_clientdata(client);
 126         unsigned int work_l, work_r;
 127
 128         switch (ctrl->id) {
 129         case V4L2_CID_AUDIO_MUTE:
 130                 state->muted = ctrl->value;
 131                 break;
 132
 133         case V4L2_CID_AUDIO_VOLUME:
 134                 state->volume = ctrl->value;
 135                 break;
 136
 137         case V4L2_CID_AUDIO_BALANCE:
 138                 state->balance = ctrl->value;
 139                 break;
 140
 141         default:
 142                 return -EINVAL;
 143         }
 144
 145         /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
 146         work_l = (min(65536 - state->balance, 32768) * state->volume) / 32768;
 147         work_r = (min(state->balance, (u16)32768) * state->volume) / 32768;
 148
 149         state->vol_l = (long)work_l * 31 / 65535;
 150         state->vol_r = (long)work_r * 31 / 65535;
 151
 152         /* set audio volume etc. */
 153         wm8739_set_audio(client);
 154         return 0;
 155 }
 156
 157 /* ------------------------------------------------------------------------ */
 158
 159 static struct v4l2_queryctrl wm8739_qctrl[] = {
 160         {
 161                 .id            = V4L2_CID_AUDIO_VOLUME,
 162                 .name          = "Volume",
 163                 .minimum       = 0,
 164                 .maximum       = 65535,
 165                 .step          = 65535/100,
 166                 .default_value = 58880,
 167                 .flags         = 0,
 168                 .type          = V4L2_CTRL_TYPE_INTEGER,
 169         },{
 170                 .id            = V4L2_CID_AUDIO_MUTE,
 171                 .name          = "Mute",
 172                 .minimum       = 0,
 173                 .maximum       = 1,
 174                 .step          = 1,
 175                 .default_value = 1,
 176                 .flags         = 0,
 177                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
 178         },{
 179                 .id            = V4L2_CID_AUDIO_BALANCE,
 180                 .name          = "Balance",
 181                 .minimum       = 0,
 182                 .maximum       = 65535,
 183                 .step          = 65535/100,
 184                 .default_value = 32768,
 185                 .flags         = 0,
 186                 .type          = V4L2_CTRL_TYPE_INTEGER,
 187         }
 188 };
 189
 190 /* ------------------------------------------------------------------------ */
 191
 192 static int wm8739_command(struct i2c_client *client, unsigned int cmd, void *arg)
 193 {
 194         struct wm8739_state *state = i2c_get_clientdata(client);
 195
 196         switch (cmd) {
 197         case VIDIOC_INT_AUDIO_CLOCK_FREQ:
 198         {
 199                 u32 audiofreq = *(u32 *)arg;
 200
 201                 state->clock_freq = audiofreq;
 202                 wm8739_write(client, R9, 0x000);        /* de-activate */
 203                 switch (audiofreq) {
 204                 case 44100:
 205                         wm8739_write(client, R8, 0x020); /* 256fps, fs=44.1k     */
 206                         break;
 207                 case 48000:
 208                         wm8739_write(client, R8, 0x000); /* 256fps, fs=48k       */
 209                         break;
 210                 case 32000:
 211                         wm8739_write(client, R8, 0x018); /* 256fps, fs=32k       */
 212                         break;
 213                 default:
 214                         break;
 215                 }
 216                 wm8739_write(client, R9, 0x001);        /* activate */
 217                 break;
 218         }
 219
 220         case VIDIOC_G_CTRL:
 221                 return wm8739_get_ctrl(client, arg);
 222
 223         case VIDIOC_S_CTRL:
 224                 return wm8739_set_ctrl(client, arg);
 225
 226         case VIDIOC_QUERYCTRL:
 227         {
 228                 struct v4l2_queryctrl *qc = arg;
 229                 int i;
 230
 231                 for (i = 0; i < ARRAY_SIZE(wm8739_qctrl); i++)
 232                         if (qc->id && qc->id == wm8739_qctrl[i].id) {
 233                                 memcpy(qc, &wm8739_qctrl[i], sizeof(*qc));
 234                                 return 0;
 235                         }
 236                 return -EINVAL;
 237         }
 238
 239         case VIDIOC_LOG_STATUS:
 240                 v4l_info(client, "Frequency: %u Hz\n", state->clock_freq);
 241                 v4l_info(client, "Volume L:  %02x%s\n", state->vol_l & 0x1f,
 242                                 state->muted ? " (muted)" : "");
 243                 v4l_info(client, "Volume R:  %02x%s\n", state->vol_r & 0x1f,
 244                                 state->muted ? " (muted)" : "");
 245                 break;
 246
 247         default:
 248                 return -EINVAL;
 249         }
 250
 251         return 0;
 252 }
 253
 254 /* ------------------------------------------------------------------------ */
 255
 256 /* i2c implementation */
 257
 258 static struct i2c_driver i2c_driver;
 259
 260 static int wm8739_attach(struct i2c_adapter *adapter, int address, int kind)
 261 {
 262         struct i2c_client *client;
 263         struct wm8739_state *state;
 264
 265         /* Check if the adapter supports the needed features */
 266         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 267                 return 0;
 268
 269         client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
 270         if (client == NULL)
 271                 return -ENOMEM;
 272
 273         client->addr = address;
 274         client->adapter = adapter;
 275         client->driver = &i2c_driver;
 276         snprintf(client->name, sizeof(client->name) - 1, "wm8739");
 277
 278         v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
 279
 280         state = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL);
 281         if (state == NULL) {
 282                 kfree(client);
 283                 return -ENOMEM;
 284         }
 285         state->vol_l = 0x17; /* 0dB */
 286         state->vol_r = 0x17; /* 0dB */
 287         state->muted = 0;
 288         state->balance = 32768;
 289         /* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */
 290         state->volume = ((long)state->vol_l + 1) * 65535 / 31;
 291         state->clock_freq = 48000;
 292         i2c_set_clientdata(client, state);
 293
 294         /* initialize wm8739 */
 295         wm8739_write(client, R15, 0x00); /* reset */
 296         wm8739_write(client, R5, 0x000); /* filter setting, high path, offet clear */
 297         wm8739_write(client, R6, 0x000); /* ADC, OSC, Power Off mode Disable */
 298         wm8739_write(client, R7, 0x049); /* Digital Audio interface format */
 299                                          /* Enable Master mode */
 300                                          /* 24 bit, MSB first/left justified */
 301         wm8739_write(client, R8, 0x000); /* sampling control */
 302                                          /* normal, 256fs, 48KHz sampling rate */
 303         wm8739_write(client, R9, 0x001); /* activate */
 304         wm8739_set_audio(client);        /* set volume/mute */
 305
 306         i2c_attach_client(client);
 307
 308         return 0;
 309 }
 310
 311 static int wm8739_probe(struct i2c_adapter *adapter)
 312 {
 313         if (adapter->class & I2C_CLASS_TV_ANALOG)
 314                 return i2c_probe(adapter, &addr_data, wm8739_attach);
 315         return 0;
 316 }
 317
 318 static int wm8739_detach(struct i2c_client *client)
 319 {
 320         int err;
 321
 322         err = i2c_detach_client(client);
 323         if (err)
 324                 return err;
 325
 326         kfree(client);
 327         return 0;
 328 }
 329
 330 /* ----------------------------------------------------------------------- */
 331
 332 /* i2c implementation */
 333 static struct i2c_driver i2c_driver = {
 334         .driver = {
 335                 .name = "wm8739",
 336         },
 337         .id = I2C_DRIVERID_WM8739,
 338         .attach_adapter = wm8739_probe,
 339         .detach_client  = wm8739_detach,
 340         .command = wm8739_command,
 341 };
 342
 343
 344 static int __init wm8739_init_module(void)
 345 {
 346         return i2c_add_driver(&i2c_driver);
 347 }
 348
 349 static void __exit wm8739_cleanup_module(void)
 350 {
 351         i2c_del_driver(&i2c_driver);
 352 }
 353
 354 module_init(wm8739_init_module);
 355 module_exit(wm8739_cleanup_module);