drivers/media/i2c/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
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/slab.h>
  23 #include <linux/ioctl.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/i2c.h>
  26 #include <linux/videodev2.h>
  27 #include <media/v4l2-device.h>
  28 #include <media/v4l2-ctrls.h>
  29
  30 MODULE_DESCRIPTION("wm8739 driver");
  31 MODULE_AUTHOR("T. Adachi, Hans Verkuil");
  32 MODULE_LICENSE("GPL");
  33
  34 static int debug;
  35
  36 module_param(debug, int, 0644);
  37
  38 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  39
  40
  41 /* ------------------------------------------------------------------------ */
  42
  43 enum {
  44         R0 = 0, R1,
  45         R5 = 5, R6, R7, R8, R9, R15 = 15,
  46         TOT_REGS
  47 };
  48
  49 struct wm8739_state {
  50         struct v4l2_subdev sd;
  51         struct v4l2_ctrl_handler hdl;
  52         struct {
  53                 /* audio cluster */
  54                 struct v4l2_ctrl *volume;
  55                 struct v4l2_ctrl *mute;
  56                 struct v4l2_ctrl *balance;
  57         };
  58         u32 clock_freq;
  59 };
  60
  61 static inline struct wm8739_state *to_state(struct v4l2_subdev *sd)
  62 {
  63         return container_of(sd, struct wm8739_state, sd);
  64 }
  65
  66 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
  67 {
  68         return &container_of(ctrl->handler, struct wm8739_state, hdl)->sd;
  69 }
  70
  71 /* ------------------------------------------------------------------------ */
  72
  73 static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val)
  74 {
  75         struct i2c_client *client = v4l2_get_subdevdata(sd);
  76         int i;
  77
  78         if (reg < 0 || reg >= TOT_REGS) {
  79                 v4l2_err(sd, "Invalid register R%d\n", reg);
  80                 return -1;
  81         }
  82
  83         v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val);
  84
  85         for (i = 0; i < 3; i++)
  86                 if (i2c_smbus_write_byte_data(client,
  87                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  88                         return 0;
  89         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  90         return -1;
  91 }
  92
  93 static int wm8739_s_ctrl(struct v4l2_ctrl *ctrl)
  94 {
  95         struct v4l2_subdev *sd = to_sd(ctrl);
  96         struct wm8739_state *state = to_state(sd);
  97         unsigned int work_l, work_r;
  98         u8 vol_l;       /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
  99         u8 vol_r;       /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
 100         u16 mute;
 101
 102         switch (ctrl->id) {
 103         case V4L2_CID_AUDIO_VOLUME:
 104                 break;
 105
 106         default:
 107                 return -EINVAL;
 108         }
 109
 110         /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
 111         work_l = (min(65536 - state->balance->val, 32768) * state->volume->val) / 32768;
 112         work_r = (min(state->balance->val, 32768) * state->volume->val) / 32768;
 113
 114         vol_l = (long)work_l * 31 / 65535;
 115         vol_r = (long)work_r * 31 / 65535;
 116
 117         /* set audio volume etc. */
 118         mute = state->mute->val ? 0x80 : 0;
 119
 120         /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
 121          * Default setting: 0x17 = 0 dB
 122          */
 123         wm8739_write(sd, R0, (vol_l & 0x1f) | mute);
 124         wm8739_write(sd, R1, (vol_r & 0x1f) | mute);
 125         return 0;
 126 }
 127
 128 /* ------------------------------------------------------------------------ */
 129
 130 static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq)
 131 {
 132         struct wm8739_state *state = to_state(sd);
 133
 134         state->clock_freq = audiofreq;
 135         /* de-activate */
 136         wm8739_write(sd, R9, 0x000);
 137         switch (audiofreq) {
 138         case 44100:
 139                 /* 256fps, fs=44.1k */
 140                 wm8739_write(sd, R8, 0x020);
 141                 break;
 142         case 48000:
 143                 /* 256fps, fs=48k */
 144                 wm8739_write(sd, R8, 0x000);
 145                 break;
 146         case 32000:
 147                 /* 256fps, fs=32k */
 148                 wm8739_write(sd, R8, 0x018);
 149                 break;
 150         default:
 151                 break;
 152         }
 153         /* activate */
 154         wm8739_write(sd, R9, 0x001);
 155         return 0;
 156 }
 157
 158 static int wm8739_log_status(struct v4l2_subdev *sd)
 159 {
 160         struct wm8739_state *state = to_state(sd);
 161
 162         v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq);
 163         v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
 164         return 0;
 165 }
 166
 167 /* ----------------------------------------------------------------------- */
 168
 169 static const struct v4l2_ctrl_ops wm8739_ctrl_ops = {
 170         .s_ctrl = wm8739_s_ctrl,
 171 };
 172
 173 static const struct v4l2_subdev_core_ops wm8739_core_ops = {
 174         .log_status = wm8739_log_status,
 175 };
 176
 177 static const struct v4l2_subdev_audio_ops wm8739_audio_ops = {
 178         .s_clock_freq = wm8739_s_clock_freq,
 179 };
 180
 181 static const struct v4l2_subdev_ops wm8739_ops = {
 182         .core = &wm8739_core_ops,
 183         .audio = &wm8739_audio_ops,
 184 };
 185
 186 /* ------------------------------------------------------------------------ */
 187
 188 /* i2c implementation */
 189
 190 static int wm8739_probe(struct i2c_client *client,
 191                         const struct i2c_device_id *id)
 192 {
 193         struct wm8739_state *state;
 194         struct v4l2_subdev *sd;
 195
 196         /* Check if the adapter supports the needed features */
 197         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 198                 return -EIO;
 199
 200         v4l_info(client, "chip found @ 0x%x (%s)\n",
 201                         client->addr << 1, client->adapter->name);
 202
 203         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 204         if (state == NULL)
 205                 return -ENOMEM;
 206         sd = &state->sd;
 207         v4l2_i2c_subdev_init(sd, client, &wm8739_ops);
 208         v4l2_ctrl_handler_init(&state->hdl, 2);
 209         state->volume = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
 210                         V4L2_CID_AUDIO_VOLUME, 0, 65535, 65535 / 100, 50736);
 211         state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
 212                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
 213         state->balance = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
 214                         V4L2_CID_AUDIO_BALANCE, 0, 65535, 65535 / 100, 32768);
 215         sd->ctrl_handler = &state->hdl;
 216         if (state->hdl.error) {
 217                 int err = state->hdl.error;
 218
 219                 v4l2_ctrl_handler_free(&state->hdl);
 220                 return err;
 221         }
 222         v4l2_ctrl_cluster(3, &state->volume);
 223
 224         state->clock_freq = 48000;
 225
 226         /* Initialize wm8739 */
 227
 228         /* reset */
 229         wm8739_write(sd, R15, 0x00);
 230         /* filter setting, high path, offet clear */
 231         wm8739_write(sd, R5, 0x000);
 232         /* ADC, OSC, Power Off mode Disable */
 233         wm8739_write(sd, R6, 0x000);
 234         /* Digital Audio interface format:
 235            Enable Master mode, 24 bit, MSB first/left justified */
 236         wm8739_write(sd, R7, 0x049);
 237         /* sampling control: normal, 256fs, 48KHz sampling rate */
 238         wm8739_write(sd, R8, 0x000);
 239         /* activate */
 240         wm8739_write(sd, R9, 0x001);
 241         /* set volume/mute */
 242         v4l2_ctrl_handler_setup(&state->hdl);
 243         return 0;
 244 }
 245
 246 static int wm8739_remove(struct i2c_client *client)
 247 {
 248         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 249         struct wm8739_state *state = to_state(sd);
 250
 251         v4l2_device_unregister_subdev(sd);
 252         v4l2_ctrl_handler_free(&state->hdl);
 253         return 0;
 254 }
 255
 256 static const struct i2c_device_id wm8739_id[] = {
 257         { "wm8739", 0 },
 258         { }
 259 };
 260 MODULE_DEVICE_TABLE(i2c, wm8739_id);
 261
 262 static struct i2c_driver wm8739_driver = {
 263         .driver = {
 264                 .name   = "wm8739",
 265         },
 266         .probe          = wm8739_probe,
 267         .remove         = wm8739_remove,
 268         .id_table       = wm8739_id,
 269 };
 270
 271 module_i2c_driver(wm8739_driver);