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/videodev2.h>
  31 #include <media/v4l2-common.h>
  32 #include <media/v4l2-chip-ident.h>
  33 #include <media/v4l2-i2c-drv.h>
  34
  35 MODULE_DESCRIPTION("wm8739 driver");
  36 MODULE_AUTHOR("T. Adachi, Hans Verkuil");
  37 MODULE_LICENSE("GPL");
  38
  39 static int debug;
  40
  41 module_param(debug, int, 0644);
  42
  43 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  44
  45
  46 /* ------------------------------------------------------------------------ */
  47
  48 enum {
  49         R0 = 0, R1,
  50         R5 = 5, R6, R7, R8, R9, R15 = 15,
  51         TOT_REGS
  52 };
  53
  54 struct wm8739_state {
  55         u32 clock_freq;
  56         u8 muted;
  57         u16 volume;
  58         u16 balance;
  59         u8 vol_l;               /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
  60         u8 vol_r;               /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
  61 };
  62
  63 /* ------------------------------------------------------------------------ */
  64
  65 static int wm8739_write(struct i2c_client *client, int reg, u16 val)
  66 {
  67         int i;
  68
  69         if (reg < 0 || reg >= TOT_REGS) {
  70                 v4l_err(client, "Invalid register R%d\n", reg);
  71                 return -1;
  72         }
  73
  74         v4l_dbg(1, debug, client, "write: %02x %02x\n", reg, val);
  75
  76         for (i = 0; i < 3; i++)
  77                 if (i2c_smbus_write_byte_data(client,
  78                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  79                         return 0;
  80         v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
  81         return -1;
  82 }
  83
  84 /* write regs to set audio volume etc */
  85 static void wm8739_set_audio(struct i2c_client *client)
  86 {
  87         struct wm8739_state *state = i2c_get_clientdata(client);
  88         u16 mute = state->muted ? 0x80 : 0;
  89
  90         /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
  91          * Default setting: 0x17 = 0 dB
  92          */
  93         wm8739_write(client, R0, (state->vol_l & 0x1f) | mute);
  94         wm8739_write(client, R1, (state->vol_r & 0x1f) | mute);
  95 }
  96
  97 static int wm8739_get_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
  98 {
  99         struct wm8739_state *state = i2c_get_clientdata(client);
 100
 101         switch (ctrl->id) {
 102         case V4L2_CID_AUDIO_MUTE:
 103                 ctrl->value = state->muted;
 104                 break;
 105
 106         case V4L2_CID_AUDIO_VOLUME:
 107                 ctrl->value = state->volume;
 108                 break;
 109
 110         case V4L2_CID_AUDIO_BALANCE:
 111                 ctrl->value = state->balance;
 112                 break;
 113
 114         default:
 115                 return -EINVAL;
 116         }
 117         return 0;
 118 }
 119
 120 static int wm8739_set_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
 121 {
 122         struct wm8739_state *state = i2c_get_clientdata(client);
 123         unsigned int work_l, work_r;
 124
 125         switch (ctrl->id) {
 126         case V4L2_CID_AUDIO_MUTE:
 127                 state->muted = ctrl->value;
 128                 break;
 129
 130         case V4L2_CID_AUDIO_VOLUME:
 131                 state->volume = ctrl->value;
 132                 break;
 133
 134         case V4L2_CID_AUDIO_BALANCE:
 135                 state->balance = ctrl->value;
 136                 break;
 137
 138         default:
 139                 return -EINVAL;
 140         }
 141
 142         /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
 143         work_l = (min(65536 - state->balance, 32768) * state->volume) / 32768;
 144         work_r = (min(state->balance, (u16)32768) * state->volume) / 32768;
 145
 146         state->vol_l = (long)work_l * 31 / 65535;
 147         state->vol_r = (long)work_r * 31 / 65535;
 148
 149         /* set audio volume etc. */
 150         wm8739_set_audio(client);
 151         return 0;
 152 }
 153
 154 /* ------------------------------------------------------------------------ */
 155
 156 static struct v4l2_queryctrl wm8739_qctrl[] = {
 157         {
 158                 .id            = V4L2_CID_AUDIO_VOLUME,
 159                 .name          = "Volume",
 160                 .minimum       = 0,
 161                 .maximum       = 65535,
 162                 .step          = 65535/100,
 163                 .default_value = 58880,
 164                 .flags         = 0,
 165                 .type          = V4L2_CTRL_TYPE_INTEGER,
 166         }, {
 167                 .id            = V4L2_CID_AUDIO_MUTE,
 168                 .name          = "Mute",
 169                 .minimum       = 0,
 170                 .maximum       = 1,
 171                 .step          = 1,
 172                 .default_value = 1,
 173                 .flags         = 0,
 174                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
 175         }, {
 176                 .id            = V4L2_CID_AUDIO_BALANCE,
 177                 .name          = "Balance",
 178                 .minimum       = 0,
 179                 .maximum       = 65535,
 180                 .step          = 65535/100,
 181                 .default_value = 32768,
 182                 .flags         = 0,
 183                 .type          = V4L2_CTRL_TYPE_INTEGER,
 184         }
 185 };
 186
 187 /* ------------------------------------------------------------------------ */
 188
 189 static int wm8739_command(struct i2c_client *client, unsigned cmd, void *arg)
 190 {
 191         struct wm8739_state *state = i2c_get_clientdata(client);
 192
 193         switch (cmd) {
 194         case VIDIOC_INT_AUDIO_CLOCK_FREQ:
 195         {
 196                 u32 audiofreq = *(u32 *)arg;
 197
 198                 state->clock_freq = audiofreq;
 199                 /* de-activate */
 200                 wm8739_write(client, R9, 0x000);
 201                 switch (audiofreq) {
 202                 case 44100:
 203                         /* 256fps, fs=44.1k */
 204                         wm8739_write(client, R8, 0x020);
 205                         break;
 206                 case 48000:
 207                         /* 256fps, fs=48k */
 208                         wm8739_write(client, R8, 0x000);
 209                         break;
 210                 case 32000:
 211                         /* 256fps, fs=32k */
 212                         wm8739_write(client, R8, 0x018);
 213                         break;
 214                 default:
 215                         break;
 216                 }
 217                 /* activate */
 218                 wm8739_write(client, R9, 0x001);
 219                 break;
 220         }
 221
 222         case VIDIOC_G_CTRL:
 223                 return wm8739_get_ctrl(client, arg);
 224
 225         case VIDIOC_S_CTRL:
 226                 return wm8739_set_ctrl(client, arg);
 227
 228         case VIDIOC_QUERYCTRL:
 229         {
 230                 struct v4l2_queryctrl *qc = arg;
 231                 int i;
 232
 233                 for (i = 0; i < ARRAY_SIZE(wm8739_qctrl); i++)
 234                         if (qc->id && qc->id == wm8739_qctrl[i].id) {
 235                                 memcpy(qc, &wm8739_qctrl[i], sizeof(*qc));
 236                                 return 0;
 237                         }
 238                 return -EINVAL;
 239         }
 240
 241         case VIDIOC_G_CHIP_IDENT:
 242                 return v4l2_chip_ident_i2c_client(client,
 243                                 arg, V4L2_IDENT_WM8739, 0);
 244
 245         case VIDIOC_LOG_STATUS:
 246                 v4l_info(client, "Frequency: %u Hz\n", state->clock_freq);
 247                 v4l_info(client, "Volume L:  %02x%s\n", state->vol_l & 0x1f,
 248                                 state->muted ? " (muted)" : "");
 249                 v4l_info(client, "Volume R:  %02x%s\n", state->vol_r & 0x1f,
 250                                 state->muted ? " (muted)" : "");
 251                 break;
 252
 253         default:
 254                 return -EINVAL;
 255         }
 256
 257         return 0;
 258 }
 259
 260 /* ------------------------------------------------------------------------ */
 261
 262 /* i2c implementation */
 263
 264 static int wm8739_probe(struct i2c_client *client,
 265                         const struct i2c_device_id *id)
 266 {
 267         struct wm8739_state *state;
 268
 269         /* Check if the adapter supports the needed features */
 270         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 271                 return -EIO;
 272
 273         v4l_info(client, "chip found @ 0x%x (%s)\n",
 274                         client->addr << 1, client->adapter->name);
 275
 276         state = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL);
 277         if (state == NULL)
 278                 return -ENOMEM;
 279         state->vol_l = 0x17; /* 0dB */
 280         state->vol_r = 0x17; /* 0dB */
 281         state->muted = 0;
 282         state->balance = 32768;
 283         /* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */
 284         state->volume = ((long)state->vol_l + 1) * 65535 / 31;
 285         state->clock_freq = 48000;
 286         i2c_set_clientdata(client, state);
 287
 288         /* Initialize wm8739 */
 289
 290         /* reset */
 291         wm8739_write(client, R15, 0x00);
 292         /* filter setting, high path, offet clear */
 293         wm8739_write(client, R5, 0x000);
 294         /* ADC, OSC, Power Off mode Disable */
 295         wm8739_write(client, R6, 0x000);
 296         /* Digital Audio interface format:
 297            Enable Master mode, 24 bit, MSB first/left justified */
 298         wm8739_write(client, R7, 0x049);
 299         /* sampling control: normal, 256fs, 48KHz sampling rate */
 300         wm8739_write(client, R8, 0x000);
 301         /* activate */
 302         wm8739_write(client, R9, 0x001);
 303         /* set volume/mute */
 304         wm8739_set_audio(client);
 305         return 0;
 306 }
 307
 308 static int wm8739_remove(struct i2c_client *client)
 309 {
 310         kfree(i2c_get_clientdata(client));
 311         return 0;
 312 }
 313
 314 static const struct i2c_device_id wm8739_id[] = {
 315         { "wm8739", 0 },
 316         { }
 317 };
 318 MODULE_DEVICE_TABLE(i2c, wm8739_id);
 319
 320 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 321         .name = "wm8739",
 322         .driverid = I2C_DRIVERID_WM8739,
 323         .command = wm8739_command,
 324         .probe = wm8739_probe,
 325         .remove = wm8739_remove,
 326         .id_table = wm8739_id,
 327 };