release/src-rt-6.x.4708/linux/linux-2.6.36/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/videodev2.h>
  31 #include <media/v4l2-device.h>
  32 #include <media/v4l2-chip-ident.h>
  33 #include <media/v4l2-i2c-drv.h>
  34 #include <media/v4l2-ctrls.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         struct v4l2_ctrl_handler hdl;
  58         struct {
  59                 /* audio cluster */
  60                 struct v4l2_ctrl *volume;
  61                 struct v4l2_ctrl *mute;
  62                 struct v4l2_ctrl *balance;
  63         };
  64         u32 clock_freq;
  65 };
  66
  67 static inline struct wm8739_state *to_state(struct v4l2_subdev *sd)
  68 {
  69         return container_of(sd, struct wm8739_state, sd);
  70 }
  71
  72 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
  73 {
  74         return &container_of(ctrl->handler, struct wm8739_state, hdl)->sd;
  75 }
  76
  77 /* ------------------------------------------------------------------------ */
  78
  79 static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val)
  80 {
  81         struct i2c_client *client = v4l2_get_subdevdata(sd);
  82         int i;
  83
  84         if (reg < 0 || reg >= TOT_REGS) {
  85                 v4l2_err(sd, "Invalid register R%d\n", reg);
  86                 return -1;
  87         }
  88
  89         v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val);
  90
  91         for (i = 0; i < 3; i++)
  92                 if (i2c_smbus_write_byte_data(client,
  93                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  94                         return 0;
  95         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  96         return -1;
  97 }
  98
  99 static int wm8739_s_ctrl(struct v4l2_ctrl *ctrl)
 100 {
 101         struct v4l2_subdev *sd = to_sd(ctrl);
 102         struct wm8739_state *state = to_state(sd);
 103         unsigned int work_l, work_r;
 104         u8 vol_l;       /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
 105         u8 vol_r;       /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
 106         u16 mute;
 107
 108         switch (ctrl->id) {
 109         case V4L2_CID_AUDIO_VOLUME:
 110                 break;
 111
 112         default:
 113                 return -EINVAL;
 114         }
 115
 116         /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
 117         work_l = (min(65536 - state->balance->val, 32768) * state->volume->val) / 32768;
 118         work_r = (min(state->balance->val, 32768) * state->volume->val) / 32768;
 119
 120         vol_l = (long)work_l * 31 / 65535;
 121         vol_r = (long)work_r * 31 / 65535;
 122
 123         /* set audio volume etc. */
 124         mute = state->mute->val ? 0x80 : 0;
 125
 126         /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
 127          * Default setting: 0x17 = 0 dB
 128          */
 129         wm8739_write(sd, R0, (vol_l & 0x1f) | mute);
 130         wm8739_write(sd, R1, (vol_r & 0x1f) | mute);
 131         return 0;
 132 }
 133
 134 /* ------------------------------------------------------------------------ */
 135
 136 static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq)
 137 {
 138         struct wm8739_state *state = to_state(sd);
 139
 140         state->clock_freq = audiofreq;
 141         /* de-activate */
 142         wm8739_write(sd, R9, 0x000);
 143         switch (audiofreq) {
 144         case 44100:
 145                 /* 256fps, fs=44.1k */
 146                 wm8739_write(sd, R8, 0x020);
 147                 break;
 148         case 48000:
 149                 /* 256fps, fs=48k */
 150                 wm8739_write(sd, R8, 0x000);
 151                 break;
 152         case 32000:
 153                 /* 256fps, fs=32k */
 154                 wm8739_write(sd, R8, 0x018);
 155                 break;
 156         default:
 157                 break;
 158         }
 159         /* activate */
 160         wm8739_write(sd, R9, 0x001);
 161         return 0;
 162 }
 163
 164 static int wm8739_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 165 {
 166         struct i2c_client *client = v4l2_get_subdevdata(sd);
 167
 168         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8739, 0);
 169 }
 170
 171 static int wm8739_log_status(struct v4l2_subdev *sd)
 172 {
 173         struct wm8739_state *state = to_state(sd);
 174
 175         v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq);
 176         v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
 177         return 0;
 178 }
 179
 180 /* ----------------------------------------------------------------------- */
 181
 182 static const struct v4l2_ctrl_ops wm8739_ctrl_ops = {
 183         .s_ctrl = wm8739_s_ctrl,
 184 };
 185
 186 static const struct v4l2_subdev_core_ops wm8739_core_ops = {
 187         .log_status = wm8739_log_status,
 188         .g_chip_ident = wm8739_g_chip_ident,
 189         .g_ext_ctrls = v4l2_subdev_g_ext_ctrls,
 190         .try_ext_ctrls = v4l2_subdev_try_ext_ctrls,
 191         .s_ext_ctrls = v4l2_subdev_s_ext_ctrls,
 192         .g_ctrl = v4l2_subdev_g_ctrl,
 193         .s_ctrl = v4l2_subdev_s_ctrl,
 194         .queryctrl = v4l2_subdev_queryctrl,
 195         .querymenu = v4l2_subdev_querymenu,
 196 };
 197
 198 static const struct v4l2_subdev_audio_ops wm8739_audio_ops = {
 199         .s_clock_freq = wm8739_s_clock_freq,
 200 };
 201
 202 static const struct v4l2_subdev_ops wm8739_ops = {
 203         .core = &wm8739_core_ops,
 204         .audio = &wm8739_audio_ops,
 205 };
 206
 207 /* ------------------------------------------------------------------------ */
 208
 209 /* i2c implementation */
 210
 211 static int wm8739_probe(struct i2c_client *client,
 212                         const struct i2c_device_id *id)
 213 {
 214         struct wm8739_state *state;
 215         struct v4l2_subdev *sd;
 216
 217         /* Check if the adapter supports the needed features */
 218         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 219                 return -EIO;
 220
 221         v4l_info(client, "chip found @ 0x%x (%s)\n",
 222                         client->addr << 1, client->adapter->name);
 223
 224         state = kzalloc(sizeof(struct wm8739_state), GFP_KERNEL);
 225         if (state == NULL)
 226                 return -ENOMEM;
 227         sd = &state->sd;
 228         v4l2_i2c_subdev_init(sd, client, &wm8739_ops);
 229         v4l2_ctrl_handler_init(&state->hdl, 2);
 230         state->volume = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
 231                         V4L2_CID_AUDIO_VOLUME, 0, 65535, 65535 / 100, 50736);
 232         state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
 233                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
 234         state->balance = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
 235                         V4L2_CID_AUDIO_BALANCE, 0, 65535, 65535 / 100, 32768);
 236         sd->ctrl_handler = &state->hdl;
 237         if (state->hdl.error) {
 238                 int err = state->hdl.error;
 239
 240                 v4l2_ctrl_handler_free(&state->hdl);
 241                 kfree(state);
 242                 return err;
 243         }
 244         v4l2_ctrl_cluster(3, &state->volume);
 245
 246         state->clock_freq = 48000;
 247
 248         /* Initialize wm8739 */
 249
 250         /* reset */
 251         wm8739_write(sd, R15, 0x00);
 252         /* filter setting, high path, offet clear */
 253         wm8739_write(sd, R5, 0x000);
 254         /* ADC, OSC, Power Off mode Disable */
 255         wm8739_write(sd, R6, 0x000);
 256         /* Digital Audio interface format:
 257            Enable Master mode, 24 bit, MSB first/left justified */
 258         wm8739_write(sd, R7, 0x049);
 259         /* sampling control: normal, 256fs, 48KHz sampling rate */
 260         wm8739_write(sd, R8, 0x000);
 261         /* activate */
 262         wm8739_write(sd, R9, 0x001);
 263         /* set volume/mute */
 264         v4l2_ctrl_handler_setup(&state->hdl);
 265         return 0;
 266 }
 267
 268 static int wm8739_remove(struct i2c_client *client)
 269 {
 270         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 271         struct wm8739_state *state = to_state(sd);
 272
 273         v4l2_device_unregister_subdev(sd);
 274         v4l2_ctrl_handler_free(&state->hdl);
 275         kfree(to_state(sd));
 276         return 0;
 277 }
 278
 279 static const struct i2c_device_id wm8739_id[] = {
 280         { "wm8739", 0 },
 281         { }
 282 };
 283 MODULE_DEVICE_TABLE(i2c, wm8739_id);
 284
 285 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 286         .name = "wm8739",
 287         .probe = wm8739_probe,
 288         .remove = wm8739_remove,
 289         .id_table = wm8739_id,
 290 };