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  * 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 <linux/uaccess.h>
  29 #include <linux/i2c.h>
  30 #include <linux/videodev2.h>
  31 #include <media/v4l2-device.h>
  32 #include <media/v4l2-ctrls.h>
  33
  34 MODULE_DESCRIPTION("wm8739 driver");
  35 MODULE_AUTHOR("T. Adachi, Hans Verkuil");
  36 MODULE_LICENSE("GPL");
  37
  38 static int debug;
  39
  40 module_param(debug, int, 0644);
  41
  42 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  43
  44
  45 /* ------------------------------------------------------------------------ */
  46
  47 enum {
  48         R0 = 0, R1,
  49         R5 = 5, R6, R7, R8, R9, R15 = 15,
  50         TOT_REGS
  51 };
  52
  53 struct wm8739_state {
  54         struct v4l2_subdev sd;
  55         struct v4l2_ctrl_handler hdl;
  56         struct {
  57                 /* audio cluster */
  58                 struct v4l2_ctrl *volume;
  59                 struct v4l2_ctrl *mute;
  60                 struct v4l2_ctrl *balance;
  61         };
  62         u32 clock_freq;
  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 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
  71 {
  72         return &container_of(ctrl->handler, struct wm8739_state, hdl)->sd;
  73 }
  74
  75 /* ------------------------------------------------------------------------ */
  76
  77 static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val)
  78 {
  79         struct i2c_client *client = v4l2_get_subdevdata(sd);
  80         int i;
  81
  82         if (reg < 0 || reg >= TOT_REGS) {
  83                 v4l2_err(sd, "Invalid register R%d\n", reg);
  84                 return -1;
  85         }
  86
  87         v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val);
  88
  89         for (i = 0; i < 3; i++)
  90                 if (i2c_smbus_write_byte_data(client,
  91                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  92                         return 0;
  93         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  94         return -1;
  95 }
  96
  97 static int wm8739_s_ctrl(struct v4l2_ctrl *ctrl)
  98 {
  99         struct v4l2_subdev *sd = to_sd(ctrl);
 100         struct wm8739_state *state = to_state(sd);
 101         unsigned int work_l, work_r;
 102         u8 vol_l;       /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
 103         u8 vol_r;       /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
 104         u16 mute;
 105
 106         switch (ctrl->id) {
 107         case V4L2_CID_AUDIO_VOLUME:
 108                 break;
 109
 110         default:
 111                 return -EINVAL;
 112         }
 113
 114         /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
 115         work_l = (min(65536 - state->balance->val, 32768) * state->volume->val) / 32768;
 116         work_r = (min(state->balance->val, 32768) * state->volume->val) / 32768;
 117
 118         vol_l = (long)work_l * 31 / 65535;
 119         vol_r = (long)work_r * 31 / 65535;
 120
 121         /* set audio volume etc. */
 122         mute = state->mute->val ? 0x80 : 0;
 123
 124         /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
 125          * Default setting: 0x17 = 0 dB
 126          */
 127         wm8739_write(sd, R0, (vol_l & 0x1f) | mute);
 128         wm8739_write(sd, R1, (vol_r & 0x1f) | mute);
 129         return 0;
 130 }
 131
 132 /* ------------------------------------------------------------------------ */
 133
 134 static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq)
 135 {
 136         struct wm8739_state *state = to_state(sd);
 137
 138         state->clock_freq = audiofreq;
 139         /* de-activate */
 140         wm8739_write(sd, R9, 0x000);
 141         switch (audiofreq) {
 142         case 44100:
 143                 /* 256fps, fs=44.1k */
 144                 wm8739_write(sd, R8, 0x020);
 145                 break;
 146         case 48000:
 147                 /* 256fps, fs=48k */
 148                 wm8739_write(sd, R8, 0x000);
 149                 break;
 150         case 32000:
 151                 /* 256fps, fs=32k */
 152                 wm8739_write(sd, R8, 0x018);
 153                 break;
 154         default:
 155                 break;
 156         }
 157         /* activate */
 158         wm8739_write(sd, R9, 0x001);
 159         return 0;
 160 }
 161
 162 static int wm8739_log_status(struct v4l2_subdev *sd)
 163 {
 164         struct wm8739_state *state = to_state(sd);
 165
 166         v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq);
 167         v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
 168         return 0;
 169 }
 170
 171 /* ----------------------------------------------------------------------- */
 172
 173 static const struct v4l2_ctrl_ops wm8739_ctrl_ops = {
 174         .s_ctrl = wm8739_s_ctrl,
 175 };
 176
 177 static const struct v4l2_subdev_core_ops wm8739_core_ops = {
 178         .log_status = wm8739_log_status,
 179 };
 180
 181 static const struct v4l2_subdev_audio_ops wm8739_audio_ops = {
 182         .s_clock_freq = wm8739_s_clock_freq,
 183 };
 184
 185 static const struct v4l2_subdev_ops wm8739_ops = {
 186         .core = &wm8739_core_ops,
 187         .audio = &wm8739_audio_ops,
 188 };
 189
 190 /* ------------------------------------------------------------------------ */
 191
 192 /* i2c implementation */
 193
 194 static int wm8739_probe(struct i2c_client *client,
 195                         const struct i2c_device_id *id)
 196 {
 197         struct wm8739_state *state;
 198         struct v4l2_subdev *sd;
 199
 200         /* Check if the adapter supports the needed features */
 201         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 202                 return -EIO;
 203
 204         v4l_info(client, "chip found @ 0x%x (%s)\n",
 205                         client->addr << 1, client->adapter->name);
 206
 207         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 208         if (state == NULL)
 209                 return -ENOMEM;
 210         sd = &state->sd;
 211         v4l2_i2c_subdev_init(sd, client, &wm8739_ops);
 212         v4l2_ctrl_handler_init(&state->hdl, 2);
 213         state->volume = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
 214                         V4L2_CID_AUDIO_VOLUME, 0, 65535, 65535 / 100, 50736);
 215         state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
 216                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
 217         state->balance = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
 218                         V4L2_CID_AUDIO_BALANCE, 0, 65535, 65535 / 100, 32768);
 219         sd->ctrl_handler = &state->hdl;
 220         if (state->hdl.error) {
 221                 int err = state->hdl.error;
 222
 223                 v4l2_ctrl_handler_free(&state->hdl);
 224                 return err;
 225         }
 226         v4l2_ctrl_cluster(3, &state->volume);
 227
 228         state->clock_freq = 48000;
 229
 230         /* Initialize wm8739 */
 231
 232         /* reset */
 233         wm8739_write(sd, R15, 0x00);
 234         /* filter setting, high path, offet clear */
 235         wm8739_write(sd, R5, 0x000);
 236         /* ADC, OSC, Power Off mode Disable */
 237         wm8739_write(sd, R6, 0x000);
 238         /* Digital Audio interface format:
 239            Enable Master mode, 24 bit, MSB first/left justified */
 240         wm8739_write(sd, R7, 0x049);
 241         /* sampling control: normal, 256fs, 48KHz sampling rate */
 242         wm8739_write(sd, R8, 0x000);
 243         /* activate */
 244         wm8739_write(sd, R9, 0x001);
 245         /* set volume/mute */
 246         v4l2_ctrl_handler_setup(&state->hdl);
 247         return 0;
 248 }
 249
 250 static int wm8739_remove(struct i2c_client *client)
 251 {
 252         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 253         struct wm8739_state *state = to_state(sd);
 254
 255         v4l2_device_unregister_subdev(sd);
 256         v4l2_ctrl_handler_free(&state->hdl);
 257         return 0;
 258 }
 259
 260 static const struct i2c_device_id wm8739_id[] = {
 261         { "wm8739", 0 },
 262         { }
 263 };
 264 MODULE_DEVICE_TABLE(i2c, wm8739_id);
 265
 266 static struct i2c_driver wm8739_driver = {
 267         .driver = {
 268                 .name   = "wm8739",
 269         },
 270         .probe          = wm8739_probe,
 271         .remove         = wm8739_remove,
 272         .id_table       = wm8739_id,
 273 };
 274
 275 module_i2c_driver(wm8739_driver);