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 #include <media/v4l2-i2c-drv-legacy.h>
  34
  35 MODULE_DESCRIPTION("wm8739 driver");
  36 MODULE_AUTHOR("T. Adachi, Hans Verkuil");
  37 MODULE_LICENSE("GPL");
  38
  39 static int debug = 0;
  40 static unsigned short normal_i2c[] = { 0x34 >> 1, 0x36 >> 1, I2C_CLIENT_END };
  41
  42 module_param(debug, int, 0644);
  43
  44 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  45
  46
  47 I2C_CLIENT_INSMOD;
  48
  49 /* ------------------------------------------------------------------------ */
  50
  51 enum {
  52         R0 = 0, R1,
  53         R5 = 5, R6, R7, R8, R9, R15 = 15,
  54         TOT_REGS
  55 };
  56
  57 struct wm8739_state {
  58         u32 clock_freq;
  59         u8 muted;
  60         u16 volume;
  61         u16 balance;
  62         u8 vol_l;               /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
  63         u8 vol_r;               /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
  64 };
  65
  66 /* ------------------------------------------------------------------------ */
  67
  68 static int wm8739_write(struct i2c_client *client, int reg, u16 val)
  69 {
  70         int i;
  71
  72         if (reg < 0 || reg >= TOT_REGS) {
  73                 v4l_err(client, "Invalid register R%d\n", reg);
  74                 return -1;
  75         }
  76
  77         v4l_dbg(1, debug, client, "write: %02x %02x\n", reg, val);
  78
  79         for (i = 0; i < 3; i++) {
  80                 if (i2c_smbus_write_byte_data(client, (reg << 1) |
  81                                         (val >> 8), val & 0xff) == 0) {
  82                         return 0;
  83                 }
  84         }
  85         v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
  86         return -1;
  87 }
  88
  89 /* write regs to set audio volume etc */
  90 static void wm8739_set_audio(struct i2c_client *client)
  91 {
  92         struct wm8739_state *state = i2c_get_clientdata(client);
  93         u16 mute = state->muted ? 0x80 : 0;
  94
  95         /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
  96          * Default setting: 0x17 = 0 dB
  97          */
  98         wm8739_write(client, R0, (state->vol_l & 0x1f) | mute);
  99         wm8739_write(client, R1, (state->vol_r & 0x1f) | mute);
 100 }
 101
 102 static int wm8739_get_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
 103 {
 104         struct wm8739_state *state = i2c_get_clientdata(client);
 105
 106         switch (ctrl->id) {
 107         case V4L2_CID_AUDIO_MUTE:
 108                 ctrl->value = state->muted;
 109                 break;
 110
 111         case V4L2_CID_AUDIO_VOLUME:
 112                 ctrl->value = state->volume;
 113                 break;
 114
 115         case V4L2_CID_AUDIO_BALANCE:
 116                 ctrl->value = state->balance;
 117                 break;
 118
 119         default:
 120                 return -EINVAL;
 121         }
 122         return 0;
 123 }
 124
 125 static int wm8739_set_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
 126 {
 127         struct wm8739_state *state = i2c_get_clientdata(client);
 128         unsigned int work_l, work_r;
 129
 130         switch (ctrl->id) {
 131         case V4L2_CID_AUDIO_MUTE:
 132                 state->muted = ctrl->value;
 133                 break;
 134
 135         case V4L2_CID_AUDIO_VOLUME:
 136                 state->volume = ctrl->value;
 137                 break;
 138
 139         case V4L2_CID_AUDIO_BALANCE:
 140                 state->balance = ctrl->value;
 141                 break;
 142
 143         default:
 144                 return -EINVAL;
 145         }
 146
 147         /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
 148         work_l = (min(65536 - state->balance, 32768) * state->volume) / 32768;
 149         work_r = (min(state->balance, (u16)32768) * state->volume) / 32768;
 150
 151         state->vol_l = (long)work_l * 31 / 65535;
 152         state->vol_r = (long)work_r * 31 / 65535;
 153
 154         /* set audio volume etc. */
 155         wm8739_set_audio(client);
 156         return 0;
 157 }
 158
 159 /* ------------------------------------------------------------------------ */
 160
 161 static struct v4l2_queryctrl wm8739_qctrl[] = {
 162         {
 163                 .id            = V4L2_CID_AUDIO_VOLUME,
 164                 .name          = "Volume",
 165                 .minimum       = 0,
 166                 .maximum       = 65535,
 167                 .step          = 65535/100,
 168                 .default_value = 58880,
 169                 .flags         = 0,
 170                 .type          = V4L2_CTRL_TYPE_INTEGER,
 171         },{
 172                 .id            = V4L2_CID_AUDIO_MUTE,
 173                 .name          = "Mute",
 174                 .minimum       = 0,
 175                 .maximum       = 1,
 176                 .step          = 1,
 177                 .default_value = 1,
 178                 .flags         = 0,
 179                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
 180         },{
 181                 .id            = V4L2_CID_AUDIO_BALANCE,
 182                 .name          = "Balance",
 183                 .minimum       = 0,
 184                 .maximum       = 65535,
 185                 .step          = 65535/100,
 186                 .default_value = 32768,
 187                 .flags         = 0,
 188                 .type          = V4L2_CTRL_TYPE_INTEGER,
 189         }
 190 };
 191
 192 /* ------------------------------------------------------------------------ */
 193
 194 static int wm8739_command(struct i2c_client *client, unsigned int cmd, void *arg)
 195 {
 196         struct wm8739_state *state = i2c_get_clientdata(client);
 197
 198         switch (cmd) {
 199         case VIDIOC_INT_AUDIO_CLOCK_FREQ:
 200         {
 201                 u32 audiofreq = *(u32 *)arg;
 202
 203                 state->clock_freq = audiofreq;
 204                 wm8739_write(client, R9, 0x000);        /* de-activate */
 205                 switch (audiofreq) {
 206                 case 44100:
 207                         wm8739_write(client, R8, 0x020); /* 256fps, fs=44.1k     */
 208                         break;
 209                 case 48000:
 210                         wm8739_write(client, R8, 0x000); /* 256fps, fs=48k       */
 211                         break;
 212                 case 32000:
 213                         wm8739_write(client, R8, 0x018); /* 256fps, fs=32k       */
 214                         break;
 215                 default:
 216                         break;
 217                 }
 218                 wm8739_write(client, R9, 0x001);        /* activate */
 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, arg, V4L2_IDENT_WM8739, 0);
 243
 244         case VIDIOC_LOG_STATUS:
 245                 v4l_info(client, "Frequency: %u Hz\n", state->clock_freq);
 246                 v4l_info(client, "Volume L:  %02x%s\n", state->vol_l & 0x1f,
 247                                 state->muted ? " (muted)" : "");
 248                 v4l_info(client, "Volume R:  %02x%s\n", state->vol_r & 0x1f,
 249                                 state->muted ? " (muted)" : "");
 250                 break;
 251
 252         default:
 253                 return -EINVAL;
 254         }
 255
 256         return 0;
 257 }
 258
 259 /* ------------------------------------------------------------------------ */
 260
 261 /* i2c implementation */
 262
 263 static int wm8739_probe(struct i2c_client *client)
 264 {
 265         struct wm8739_state *state;
 266
 267         /* Check if the adapter supports the needed features */
 268         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 269                 return -EIO;
 270
 271         v4l_info(client, "chip found @ 0x%x (%s)\n", client->addr << 1, client->adapter->name);
 272
 273         state = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL);
 274         if (state == NULL) {
 275                 kfree(client);
 276                 return -ENOMEM;
 277         }
 278         state->vol_l = 0x17; /* 0dB */
 279         state->vol_r = 0x17; /* 0dB */
 280         state->muted = 0;
 281         state->balance = 32768;
 282         /* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */
 283         state->volume = ((long)state->vol_l + 1) * 65535 / 31;
 284         state->clock_freq = 48000;
 285         i2c_set_clientdata(client, state);
 286
 287         /* initialize wm8739 */
 288         wm8739_write(client, R15, 0x00); /* reset */
 289         wm8739_write(client, R5, 0x000); /* filter setting, high path, offet clear */
 290         wm8739_write(client, R6, 0x000); /* ADC, OSC, Power Off mode Disable */
 291         wm8739_write(client, R7, 0x049); /* Digital Audio interface format */
 292                                          /* Enable Master mode */
 293                                          /* 24 bit, MSB first/left justified */
 294         wm8739_write(client, R8, 0x000); /* sampling control */
 295                                          /* normal, 256fs, 48KHz sampling rate */
 296         wm8739_write(client, R9, 0x001); /* activate */
 297         wm8739_set_audio(client);        /* set volume/mute */
 298         return 0;
 299 }
 300
 301 static int wm8739_remove(struct i2c_client *client)
 302 {
 303         kfree(i2c_get_clientdata(client));
 304         return 0;
 305 }
 306
 307 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 308         .name = "wm8739",
 309         .driverid = I2C_DRIVERID_WM8739,
 310         .command = wm8739_command,
 311         .probe = wm8739_probe,
 312         .remove = wm8739_remove,
 313 };
 314