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-device.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         struct v4l2_subdev sd;
  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 static inline struct wm8739_state *to_state(struct v4l2_subdev *sd)
  65 {
  66         return container_of(sd, struct wm8739_state, sd);
  67 }
  68
  69 /* ------------------------------------------------------------------------ */
  70
  71 static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val)
  72 {
  73         struct i2c_client *client = v4l2_get_subdevdata(sd);
  74         int i;
  75
  76         if (reg < 0 || reg >= TOT_REGS) {
  77                 v4l2_err(sd, "Invalid register R%d\n", reg);
  78                 return -1;
  79         }
  80
  81         v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val);
  82
  83         for (i = 0; i < 3; i++)
  84                 if (i2c_smbus_write_byte_data(client,
  85                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  86                         return 0;
  87         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  88         return -1;
  89 }
  90
  91 /* write regs to set audio volume etc */
  92 static void wm8739_set_audio(struct v4l2_subdev *sd)
  93 {
  94         struct wm8739_state *state = to_state(sd);
  95         u16 mute = state->muted ? 0x80 : 0;
  96
  97         /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
  98          * Default setting: 0x17 = 0 dB
  99          */
 100         wm8739_write(sd, R0, (state->vol_l & 0x1f) | mute);
 101         wm8739_write(sd, R1, (state->vol_r & 0x1f) | mute);
 102 }
 103
 104 static int wm8739_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 105 {
 106         struct wm8739_state *state = to_state(sd);
 107
 108         switch (ctrl->id) {
 109         case V4L2_CID_AUDIO_MUTE:
 110                 ctrl->value = state->muted;
 111                 break;
 112
 113         case V4L2_CID_AUDIO_VOLUME:
 114                 ctrl->value = state->volume;
 115                 break;
 116
 117         case V4L2_CID_AUDIO_BALANCE:
 118                 ctrl->value = state->balance;
 119                 break;
 120
 121         default:
 122                 return -EINVAL;
 123         }
 124         return 0;
 125 }
 126
 127 static int wm8739_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 128 {
 129         struct wm8739_state *state = to_state(sd);
 130         unsigned int work_l, work_r;
 131
 132         switch (ctrl->id) {
 133         case V4L2_CID_AUDIO_MUTE:
 134                 state->muted = ctrl->value;
 135                 break;
 136
 137         case V4L2_CID_AUDIO_VOLUME:
 138                 state->volume = ctrl->value;
 139                 break;
 140
 141         case V4L2_CID_AUDIO_BALANCE:
 142                 state->balance = ctrl->value;
 143                 break;
 144
 145         default:
 146                 return -EINVAL;
 147         }
 148
 149         /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
 150         work_l = (min(65536 - state->balance, 32768) * state->volume) / 32768;
 151         work_r = (min(state->balance, (u16)32768) * state->volume) / 32768;
 152
 153         state->vol_l = (long)work_l * 31 / 65535;
 154         state->vol_r = (long)work_r * 31 / 65535;
 155
 156         /* set audio volume etc. */
 157         wm8739_set_audio(sd);
 158         return 0;
 159 }
 160
 161 /* ------------------------------------------------------------------------ */
 162
 163 static struct v4l2_queryctrl wm8739_qctrl[] = {
 164         {
 165                 .id            = V4L2_CID_AUDIO_VOLUME,
 166                 .name          = "Volume",
 167                 .minimum       = 0,
 168                 .maximum       = 65535,
 169                 .step          = 65535/100,
 170                 .default_value = 58880,
 171                 .flags         = 0,
 172                 .type          = V4L2_CTRL_TYPE_INTEGER,
 173         }, {
 174                 .id            = V4L2_CID_AUDIO_MUTE,
 175                 .name          = "Mute",
 176                 .minimum       = 0,
 177                 .maximum       = 1,
 178                 .step          = 1,
 179                 .default_value = 1,
 180                 .flags         = 0,
 181                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
 182         }, {
 183                 .id            = V4L2_CID_AUDIO_BALANCE,
 184                 .name          = "Balance",
 185                 .minimum       = 0,
 186                 .maximum       = 65535,
 187                 .step          = 65535/100,
 188                 .default_value = 32768,
 189                 .flags         = 0,
 190                 .type          = V4L2_CTRL_TYPE_INTEGER,
 191         }
 192 };
 193
 194 /* ------------------------------------------------------------------------ */
 195
 196 static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq)
 197 {
 198         struct wm8739_state *state = to_state(sd);
 199
 200         state->clock_freq = audiofreq;
 201         /* de-activate */
 202         wm8739_write(sd, R9, 0x000);
 203         switch (audiofreq) {
 204         case 44100:
 205                 /* 256fps, fs=44.1k */
 206                 wm8739_write(sd, R8, 0x020);
 207                 break;
 208         case 48000:
 209                 /* 256fps, fs=48k */
 210                 wm8739_write(sd, R8, 0x000);
 211                 break;
 212         case 32000:
 213                 /* 256fps, fs=32k */
 214                 wm8739_write(sd, R8, 0x018);
 215                 break;
 216         default:
 217                 break;
 218         }
 219         /* activate */
 220         wm8739_write(sd, R9, 0x001);
 221         return 0;
 222 }
 223
 224 static int wm8739_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
 225 {
 226         int i;
 227
 228         for (i = 0; i < ARRAY_SIZE(wm8739_qctrl); i++)
 229                 if (qc->id && qc->id == wm8739_qctrl[i].id) {
 230                         memcpy(qc, &wm8739_qctrl[i], sizeof(*qc));
 231                         return 0;
 232                 }
 233         return -EINVAL;
 234 }
 235
 236 static int wm8739_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 237 {
 238         struct i2c_client *client = v4l2_get_subdevdata(sd);
 239
 240         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8739, 0);
 241 }
 242
 243 static int wm8739_log_status(struct v4l2_subdev *sd)
 244 {
 245         struct wm8739_state *state = to_state(sd);
 246
 247         v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq);
 248         v4l2_info(sd, "Volume L:  %02x%s\n", state->vol_l & 0x1f,
 249                         state->muted ? " (muted)" : "");
 250         v4l2_info(sd, "Volume R:  %02x%s\n", state->vol_r & 0x1f,
 251                         state->muted ? " (muted)" : "");
 252         return 0;
 253 }
 254
 255 /* ----------------------------------------------------------------------- */
 256
 257 static const struct v4l2_subdev_core_ops wm8739_core_ops = {
 258         .log_status = wm8739_log_status,
 259         .g_chip_ident = wm8739_g_chip_ident,
 260         .queryctrl = wm8739_queryctrl,
 261         .g_ctrl = wm8739_g_ctrl,
 262         .s_ctrl = wm8739_s_ctrl,
 263 };
 264
 265 static const struct v4l2_subdev_audio_ops wm8739_audio_ops = {
 266         .s_clock_freq = wm8739_s_clock_freq,
 267 };
 268
 269 static const struct v4l2_subdev_ops wm8739_ops = {
 270         .core = &wm8739_core_ops,
 271         .audio = &wm8739_audio_ops,
 272 };
 273
 274 /* ------------------------------------------------------------------------ */
 275
 276 /* i2c implementation */
 277
 278 static int wm8739_probe(struct i2c_client *client,
 279                         const struct i2c_device_id *id)
 280 {
 281         struct wm8739_state *state;
 282         struct v4l2_subdev *sd;
 283
 284         /* Check if the adapter supports the needed features */
 285         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 286                 return -EIO;
 287
 288         v4l_info(client, "chip found @ 0x%x (%s)\n",
 289                         client->addr << 1, client->adapter->name);
 290
 291         state = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL);
 292         if (state == NULL)
 293                 return -ENOMEM;
 294         sd = &state->sd;
 295         v4l2_i2c_subdev_init(sd, client, &wm8739_ops);
 296         state->vol_l = 0x17; /* 0dB */
 297         state->vol_r = 0x17; /* 0dB */
 298         state->muted = 0;
 299         state->balance = 32768;
 300         /* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */
 301         state->volume = ((long)state->vol_l + 1) * 65535 / 31;
 302         state->clock_freq = 48000;
 303
 304         /* Initialize wm8739 */
 305
 306         /* reset */
 307         wm8739_write(sd, R15, 0x00);
 308         /* filter setting, high path, offet clear */
 309         wm8739_write(sd, R5, 0x000);
 310         /* ADC, OSC, Power Off mode Disable */
 311         wm8739_write(sd, R6, 0x000);
 312         /* Digital Audio interface format:
 313            Enable Master mode, 24 bit, MSB first/left justified */
 314         wm8739_write(sd, R7, 0x049);
 315         /* sampling control: normal, 256fs, 48KHz sampling rate */
 316         wm8739_write(sd, R8, 0x000);
 317         /* activate */
 318         wm8739_write(sd, R9, 0x001);
 319         /* set volume/mute */
 320         wm8739_set_audio(sd);
 321         return 0;
 322 }
 323
 324 static int wm8739_remove(struct i2c_client *client)
 325 {
 326         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 327
 328         v4l2_device_unregister_subdev(sd);
 329         kfree(to_state(sd));
 330         return 0;
 331 }
 332
 333 static const struct i2c_device_id wm8739_id[] = {
 334         { "wm8739", 0 },
 335         { }
 336 };
 337 MODULE_DEVICE_TABLE(i2c, wm8739_id);
 338
 339 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 340         .name = "wm8739",
 341         .probe = wm8739_probe,
 342         .remove = wm8739_remove,
 343         .id_table = wm8739_id,
 344 };