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 #include <media/v4l2-chip-ident.h>
  33
  34 MODULE_DESCRIPTION("wm8739 driver");
  35 MODULE_AUTHOR("T. Adachi, Hans Verkuil");
  36 MODULE_LICENSE("GPL");
  37
  38 static int debug = 0;
  39 static unsigned short normal_i2c[] = { 0x34 >> 1, 0x36 >> 1, I2C_CLIENT_END };
  40
  41 module_param(debug, int, 0644);
  42
  43 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  44
  45
  46 I2C_CLIENT_INSMOD;
  47
  48 /* ------------------------------------------------------------------------ */
  49
  50 enum {
  51         R0 = 0, R1,
  52         R5 = 5, R6, R7, R8, R9, R15 = 15,
  53         TOT_REGS
  54 };
  55
  56 struct wm8739_state {
  57         u32 clock_freq;
  58         u8 muted;
  59         u16 volume;
  60         u16 balance;
  61         u8 vol_l;               /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
  62         u8 vol_r;               /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
  63 };
  64
  65 /* ------------------------------------------------------------------------ */
  66
  67 static int wm8739_write(struct i2c_client *client, int reg, u16 val)
  68 {
  69         int i;
  70
  71         if (reg < 0 || reg >= TOT_REGS) {
  72                 v4l_err(client, "Invalid register R%d\n", reg);
  73                 return -1;
  74         }
  75
  76         v4l_dbg(1, debug, client, "write: %02x %02x\n", reg, val);
  77
  78         for (i = 0; i < 3; i++) {
  79                 if (i2c_smbus_write_byte_data(client, (reg << 1) |
  80                                         (val >> 8), val & 0xff) == 0) {
  81                         return 0;
  82                 }
  83         }
  84         v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
  85         return -1;
  86 }
  87
  88 /* write regs to set audio volume etc */
  89 static void wm8739_set_audio(struct i2c_client *client)
  90 {
  91         struct wm8739_state *state = i2c_get_clientdata(client);
  92         u16 mute = state->muted ? 0x80 : 0;
  93
  94         /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
  95          * Default setting: 0x17 = 0 dB
  96          */
  97         wm8739_write(client, R0, (state->vol_l & 0x1f) | mute);
  98         wm8739_write(client, R1, (state->vol_r & 0x1f) | mute);
  99 }
 100
 101 static int wm8739_get_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
 102 {
 103         struct wm8739_state *state = i2c_get_clientdata(client);
 104
 105         switch (ctrl->id) {
 106         case V4L2_CID_AUDIO_MUTE:
 107                 ctrl->value = state->muted;
 108                 break;
 109
 110         case V4L2_CID_AUDIO_VOLUME:
 111                 ctrl->value = state->volume;
 112                 break;
 113
 114         case V4L2_CID_AUDIO_BALANCE:
 115                 ctrl->value = state->balance;
 116                 break;
 117
 118         default:
 119                 return -EINVAL;
 120         }
 121         return 0;
 122 }
 123
 124 static int wm8739_set_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
 125 {
 126         struct wm8739_state *state = i2c_get_clientdata(client);
 127         unsigned int work_l, work_r;
 128
 129         switch (ctrl->id) {
 130         case V4L2_CID_AUDIO_MUTE:
 131                 state->muted = ctrl->value;
 132                 break;
 133
 134         case V4L2_CID_AUDIO_VOLUME:
 135                 state->volume = ctrl->value;
 136                 break;
 137
 138         case V4L2_CID_AUDIO_BALANCE:
 139                 state->balance = ctrl->value;
 140                 break;
 141
 142         default:
 143                 return -EINVAL;
 144         }
 145
 146         /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
 147         work_l = (min(65536 - state->balance, 32768) * state->volume) / 32768;
 148         work_r = (min(state->balance, (u16)32768) * state->volume) / 32768;
 149
 150         state->vol_l = (long)work_l * 31 / 65535;
 151         state->vol_r = (long)work_r * 31 / 65535;
 152
 153         /* set audio volume etc. */
 154         wm8739_set_audio(client);
 155         return 0;
 156 }
 157
 158 /* ------------------------------------------------------------------------ */
 159
 160 static struct v4l2_queryctrl wm8739_qctrl[] = {
 161         {
 162                 .id            = V4L2_CID_AUDIO_VOLUME,
 163                 .name          = "Volume",
 164                 .minimum       = 0,
 165                 .maximum       = 65535,
 166                 .step          = 65535/100,
 167                 .default_value = 58880,
 168                 .flags         = 0,
 169                 .type          = V4L2_CTRL_TYPE_INTEGER,
 170         },{
 171                 .id            = V4L2_CID_AUDIO_MUTE,
 172                 .name          = "Mute",
 173                 .minimum       = 0,
 174                 .maximum       = 1,
 175                 .step          = 1,
 176                 .default_value = 1,
 177                 .flags         = 0,
 178                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
 179         },{
 180                 .id            = V4L2_CID_AUDIO_BALANCE,
 181                 .name          = "Balance",
 182                 .minimum       = 0,
 183                 .maximum       = 65535,
 184                 .step          = 65535/100,
 185                 .default_value = 32768,
 186                 .flags         = 0,
 187                 .type          = V4L2_CTRL_TYPE_INTEGER,
 188         }
 189 };
 190
 191 /* ------------------------------------------------------------------------ */
 192
 193 static int wm8739_command(struct i2c_client *client, unsigned int cmd, void *arg)
 194 {
 195         struct wm8739_state *state = i2c_get_clientdata(client);
 196
 197         switch (cmd) {
 198         case VIDIOC_INT_AUDIO_CLOCK_FREQ:
 199         {
 200                 u32 audiofreq = *(u32 *)arg;
 201
 202                 state->clock_freq = audiofreq;
 203                 wm8739_write(client, R9, 0x000);        /* de-activate */
 204                 switch (audiofreq) {
 205                 case 44100:
 206                         wm8739_write(client, R8, 0x020); /* 256fps, fs=44.1k     */
 207                         break;
 208                 case 48000:
 209                         wm8739_write(client, R8, 0x000); /* 256fps, fs=48k       */
 210                         break;
 211                 case 32000:
 212                         wm8739_write(client, R8, 0x018); /* 256fps, fs=32k       */
 213                         break;
 214                 default:
 215                         break;
 216                 }
 217                 wm8739_write(client, R9, 0x001);        /* activate */
 218                 break;
 219         }
 220
 221         case VIDIOC_G_CTRL:
 222                 return wm8739_get_ctrl(client, arg);
 223
 224         case VIDIOC_S_CTRL:
 225                 return wm8739_set_ctrl(client, arg);
 226
 227         case VIDIOC_QUERYCTRL:
 228         {
 229                 struct v4l2_queryctrl *qc = arg;
 230                 int i;
 231
 232                 for (i = 0; i < ARRAY_SIZE(wm8739_qctrl); i++)
 233                         if (qc->id && qc->id == wm8739_qctrl[i].id) {
 234                                 memcpy(qc, &wm8739_qctrl[i], sizeof(*qc));
 235                                 return 0;
 236                         }
 237                 return -EINVAL;
 238         }
 239
 240         case VIDIOC_G_CHIP_IDENT:
 241                 return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_WM8739, 0);
 242
 243         case VIDIOC_LOG_STATUS:
 244                 v4l_info(client, "Frequency: %u Hz\n", state->clock_freq);
 245                 v4l_info(client, "Volume L:  %02x%s\n", state->vol_l & 0x1f,
 246                                 state->muted ? " (muted)" : "");
 247                 v4l_info(client, "Volume R:  %02x%s\n", state->vol_r & 0x1f,
 248                                 state->muted ? " (muted)" : "");
 249                 break;
 250
 251         default:
 252                 return -EINVAL;
 253         }
 254
 255         return 0;
 256 }
 257
 258 /* ------------------------------------------------------------------------ */
 259
 260 /* i2c implementation */
 261
 262 static struct i2c_driver i2c_driver;
 263
 264 static int wm8739_attach(struct i2c_adapter *adapter, int address, int kind)
 265 {
 266         struct i2c_client *client;
 267         struct wm8739_state *state;
 268
 269         /* Check if the adapter supports the needed features */
 270         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 271                 return 0;
 272
 273         client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
 274         if (client == NULL)
 275                 return -ENOMEM;
 276
 277         client->addr = address;
 278         client->adapter = adapter;
 279         client->driver = &i2c_driver;
 280         snprintf(client->name, sizeof(client->name) - 1, "wm8739");
 281
 282         v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
 283
 284         state = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL);
 285         if (state == NULL) {
 286                 kfree(client);
 287                 return -ENOMEM;
 288         }
 289         state->vol_l = 0x17; /* 0dB */
 290         state->vol_r = 0x17; /* 0dB */
 291         state->muted = 0;
 292         state->balance = 32768;
 293         /* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */
 294         state->volume = ((long)state->vol_l + 1) * 65535 / 31;
 295         state->clock_freq = 48000;
 296         i2c_set_clientdata(client, state);
 297
 298         /* initialize wm8739 */
 299         wm8739_write(client, R15, 0x00); /* reset */
 300         wm8739_write(client, R5, 0x000); /* filter setting, high path, offet clear */
 301         wm8739_write(client, R6, 0x000); /* ADC, OSC, Power Off mode Disable */
 302         wm8739_write(client, R7, 0x049); /* Digital Audio interface format */
 303                                          /* Enable Master mode */
 304                                          /* 24 bit, MSB first/left justified */
 305         wm8739_write(client, R8, 0x000); /* sampling control */
 306                                          /* normal, 256fs, 48KHz sampling rate */
 307         wm8739_write(client, R9, 0x001); /* activate */
 308         wm8739_set_audio(client);        /* set volume/mute */
 309
 310         i2c_attach_client(client);
 311
 312         return 0;
 313 }
 314
 315 static int wm8739_probe(struct i2c_adapter *adapter)
 316 {
 317         if (adapter->class & I2C_CLASS_TV_ANALOG)
 318                 return i2c_probe(adapter, &addr_data, wm8739_attach);
 319         return 0;
 320 }
 321
 322 static int wm8739_detach(struct i2c_client *client)
 323 {
 324         struct wm8739_state *state = i2c_get_clientdata(client);
 325         int err;
 326
 327         err = i2c_detach_client(client);
 328         if (err)
 329                 return err;
 330
 331         kfree(state);
 332         kfree(client);
 333         return 0;
 334 }
 335
 336 /* ----------------------------------------------------------------------- */
 337
 338 /* i2c implementation */
 339 static struct i2c_driver i2c_driver = {
 340         .driver = {
 341                 .name = "wm8739",
 342         },
 343         .id = I2C_DRIVERID_WM8739,
 344         .attach_adapter = wm8739_probe,
 345         .detach_client  = wm8739_detach,
 346         .command = wm8739_command,
 347 };
 348
 349
 350 static int __init wm8739_init_module(void)
 351 {
 352         return i2c_add_driver(&i2c_driver);
 353 }
 354
 355 static void __exit wm8739_cleanup_module(void)
 356 {
 357         i2c_del_driver(&i2c_driver);
 358 }
 359
 360 module_init(wm8739_init_module);
 361 module_exit(wm8739_cleanup_module);