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/slab.h>
  27 #include <linux/ioctl.h>
  28 #include <asm/uaccess.h>
  29 #include <linux/i2c.h>
  30 #include <linux/i2c-id.h>
  31 #include <linux/videodev2.h>
  32 #include <media/v4l2-device.h>
  33 #include <media/v4l2-chip-ident.h>
  34 #include <media/v4l2-i2c-drv.h>
  35
  36 MODULE_DESCRIPTION("wm8739 driver");
  37 MODULE_AUTHOR("T. Adachi, Hans Verkuil");
  38 MODULE_LICENSE("GPL");
  39
  40 static int debug;
  41
  42 module_param(debug, int, 0644);
  43
  44 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  45
  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         struct v4l2_subdev sd;
  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 static inline struct wm8739_state *to_state(struct v4l2_subdev *sd)
  66 {
  67         return container_of(sd, struct wm8739_state, sd);
  68 }
  69
  70 /* ------------------------------------------------------------------------ */
  71
  72 static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val)
  73 {
  74         struct i2c_client *client = v4l2_get_subdevdata(sd);
  75         int i;
  76
  77         if (reg < 0 || reg >= TOT_REGS) {
  78                 v4l2_err(sd, "Invalid register R%d\n", reg);
  79                 return -1;
  80         }
  81
  82         v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val);
  83
  84         for (i = 0; i < 3; i++)
  85                 if (i2c_smbus_write_byte_data(client,
  86                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  87                         return 0;
  88         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  89         return -1;
  90 }
  91
  92 /* write regs to set audio volume etc */
  93 static void wm8739_set_audio(struct v4l2_subdev *sd)
  94 {
  95         struct wm8739_state *state = to_state(sd);
  96         u16 mute = state->muted ? 0x80 : 0;
  97
  98         /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
  99          * Default setting: 0x17 = 0 dB
 100          */
 101         wm8739_write(sd, R0, (state->vol_l & 0x1f) | mute);
 102         wm8739_write(sd, R1, (state->vol_r & 0x1f) | mute);
 103 }
 104
 105 static int wm8739_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 106 {
 107         struct wm8739_state *state = to_state(sd);
 108
 109         switch (ctrl->id) {
 110         case V4L2_CID_AUDIO_MUTE:
 111                 ctrl->value = state->muted;
 112                 break;
 113
 114         case V4L2_CID_AUDIO_VOLUME:
 115                 ctrl->value = state->volume;
 116                 break;
 117
 118         case V4L2_CID_AUDIO_BALANCE:
 119                 ctrl->value = state->balance;
 120                 break;
 121
 122         default:
 123                 return -EINVAL;
 124         }
 125         return 0;
 126 }
 127
 128 static int wm8739_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 129 {
 130         struct wm8739_state *state = to_state(sd);
 131         unsigned int work_l, work_r;
 132
 133         switch (ctrl->id) {
 134         case V4L2_CID_AUDIO_MUTE:
 135                 state->muted = ctrl->value;
 136                 break;
 137
 138         case V4L2_CID_AUDIO_VOLUME:
 139                 state->volume = ctrl->value;
 140                 break;
 141
 142         case V4L2_CID_AUDIO_BALANCE:
 143                 state->balance = ctrl->value;
 144                 break;
 145
 146         default:
 147                 return -EINVAL;
 148         }
 149
 150         /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
 151         work_l = (min(65536 - state->balance, 32768) * state->volume) / 32768;
 152         work_r = (min(state->balance, (u16)32768) * state->volume) / 32768;
 153
 154         state->vol_l = (long)work_l * 31 / 65535;
 155         state->vol_r = (long)work_r * 31 / 65535;
 156
 157         /* set audio volume etc. */
 158         wm8739_set_audio(sd);
 159         return 0;
 160 }
 161
 162 /* ------------------------------------------------------------------------ */
 163
 164 static struct v4l2_queryctrl wm8739_qctrl[] = {
 165         {
 166                 .id            = V4L2_CID_AUDIO_VOLUME,
 167                 .name          = "Volume",
 168                 .minimum       = 0,
 169                 .maximum       = 65535,
 170                 .step          = 65535/100,
 171                 .default_value = 58880,
 172                 .flags         = 0,
 173                 .type          = V4L2_CTRL_TYPE_INTEGER,
 174         }, {
 175                 .id            = V4L2_CID_AUDIO_MUTE,
 176                 .name          = "Mute",
 177                 .minimum       = 0,
 178                 .maximum       = 1,
 179                 .step          = 1,
 180                 .default_value = 1,
 181                 .flags         = 0,
 182                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
 183         }, {
 184                 .id            = V4L2_CID_AUDIO_BALANCE,
 185                 .name          = "Balance",
 186                 .minimum       = 0,
 187                 .maximum       = 65535,
 188                 .step          = 65535/100,
 189                 .default_value = 32768,
 190                 .flags         = 0,
 191                 .type          = V4L2_CTRL_TYPE_INTEGER,
 192         }
 193 };
 194
 195 /* ------------------------------------------------------------------------ */
 196
 197 static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq)
 198 {
 199         struct wm8739_state *state = to_state(sd);
 200
 201         state->clock_freq = audiofreq;
 202         /* de-activate */
 203         wm8739_write(sd, R9, 0x000);
 204         switch (audiofreq) {
 205         case 44100:
 206                 /* 256fps, fs=44.1k */
 207                 wm8739_write(sd, R8, 0x020);
 208                 break;
 209         case 48000:
 210                 /* 256fps, fs=48k */
 211                 wm8739_write(sd, R8, 0x000);
 212                 break;
 213         case 32000:
 214                 /* 256fps, fs=32k */
 215                 wm8739_write(sd, R8, 0x018);
 216                 break;
 217         default:
 218                 break;
 219         }
 220         /* activate */
 221         wm8739_write(sd, R9, 0x001);
 222         return 0;
 223 }
 224
 225 static int wm8739_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
 226 {
 227         int i;
 228
 229         for (i = 0; i < ARRAY_SIZE(wm8739_qctrl); i++)
 230                 if (qc->id && qc->id == wm8739_qctrl[i].id) {
 231                         memcpy(qc, &wm8739_qctrl[i], sizeof(*qc));
 232                         return 0;
 233                 }
 234         return -EINVAL;
 235 }
 236
 237 static int wm8739_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 238 {
 239         struct i2c_client *client = v4l2_get_subdevdata(sd);
 240
 241         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8739, 0);
 242 }
 243
 244 static int wm8739_log_status(struct v4l2_subdev *sd)
 245 {
 246         struct wm8739_state *state = to_state(sd);
 247
 248         v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq);
 249         v4l2_info(sd, "Volume L:  %02x%s\n", state->vol_l & 0x1f,
 250                         state->muted ? " (muted)" : "");
 251         v4l2_info(sd, "Volume R:  %02x%s\n", state->vol_r & 0x1f,
 252                         state->muted ? " (muted)" : "");
 253         return 0;
 254 }
 255
 256 /* ----------------------------------------------------------------------- */
 257
 258 static const struct v4l2_subdev_core_ops wm8739_core_ops = {
 259         .log_status = wm8739_log_status,
 260         .g_chip_ident = wm8739_g_chip_ident,
 261         .queryctrl = wm8739_queryctrl,
 262         .g_ctrl = wm8739_g_ctrl,
 263         .s_ctrl = wm8739_s_ctrl,
 264 };
 265
 266 static const struct v4l2_subdev_audio_ops wm8739_audio_ops = {
 267         .s_clock_freq = wm8739_s_clock_freq,
 268 };
 269
 270 static const struct v4l2_subdev_ops wm8739_ops = {
 271         .core = &wm8739_core_ops,
 272         .audio = &wm8739_audio_ops,
 273 };
 274
 275 /* ------------------------------------------------------------------------ */
 276
 277 /* i2c implementation */
 278
 279 static int wm8739_probe(struct i2c_client *client,
 280                         const struct i2c_device_id *id)
 281 {
 282         struct wm8739_state *state;
 283         struct v4l2_subdev *sd;
 284
 285         /* Check if the adapter supports the needed features */
 286         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 287                 return -EIO;
 288
 289         v4l_info(client, "chip found @ 0x%x (%s)\n",
 290                         client->addr << 1, client->adapter->name);
 291
 292         state = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL);
 293         if (state == NULL)
 294                 return -ENOMEM;
 295         sd = &state->sd;
 296         v4l2_i2c_subdev_init(sd, client, &wm8739_ops);
 297         state->vol_l = 0x17; /* 0dB */
 298         state->vol_r = 0x17; /* 0dB */
 299         state->muted = 0;
 300         state->balance = 32768;
 301         /* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */
 302         state->volume = ((long)state->vol_l + 1) * 65535 / 31;
 303         state->clock_freq = 48000;
 304
 305         /* Initialize wm8739 */
 306
 307         /* reset */
 308         wm8739_write(sd, R15, 0x00);
 309         /* filter setting, high path, offet clear */
 310         wm8739_write(sd, R5, 0x000);
 311         /* ADC, OSC, Power Off mode Disable */
 312         wm8739_write(sd, R6, 0x000);
 313         /* Digital Audio interface format:
 314            Enable Master mode, 24 bit, MSB first/left justified */
 315         wm8739_write(sd, R7, 0x049);
 316         /* sampling control: normal, 256fs, 48KHz sampling rate */
 317         wm8739_write(sd, R8, 0x000);
 318         /* activate */
 319         wm8739_write(sd, R9, 0x001);
 320         /* set volume/mute */
 321         wm8739_set_audio(sd);
 322         return 0;
 323 }
 324
 325 static int wm8739_remove(struct i2c_client *client)
 326 {
 327         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 328
 329         v4l2_device_unregister_subdev(sd);
 330         kfree(to_state(sd));
 331         return 0;
 332 }
 333
 334 static const struct i2c_device_id wm8739_id[] = {
 335         { "wm8739", 0 },
 336         { }
 337 };
 338 MODULE_DEVICE_TABLE(i2c, wm8739_id);
 339
 340 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 341         .name = "wm8739",
 342         .probe = wm8739_probe,
 343         .remove = wm8739_remove,
 344         .id_table = wm8739_id,
 345 };