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 <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-ctrls.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         struct v4l2_ctrl_handler hdl;
  57         struct {
  58                 /* audio cluster */
  59                 struct v4l2_ctrl *volume;
  60                 struct v4l2_ctrl *mute;
  61                 struct v4l2_ctrl *balance;
  62         };
  63         u32 clock_freq;
  64 };
  65
  66 static inline struct wm8739_state *to_state(struct v4l2_subdev *sd)
  67 {
  68         return container_of(sd, struct wm8739_state, sd);
  69 }
  70
  71 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
  72 {
  73         return &container_of(ctrl->handler, struct wm8739_state, hdl)->sd;
  74 }
  75
  76 /* ------------------------------------------------------------------------ */
  77
  78 static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val)
  79 {
  80         struct i2c_client *client = v4l2_get_subdevdata(sd);
  81         int i;
  82
  83         if (reg < 0 || reg >= TOT_REGS) {
  84                 v4l2_err(sd, "Invalid register R%d\n", reg);
  85                 return -1;
  86         }
  87
  88         v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val);
  89
  90         for (i = 0; i < 3; i++)
  91                 if (i2c_smbus_write_byte_data(client,
  92                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  93                         return 0;
  94         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  95         return -1;
  96 }
  97
  98 static int wm8739_s_ctrl(struct v4l2_ctrl *ctrl)
  99 {
 100         struct v4l2_subdev *sd = to_sd(ctrl);
 101         struct wm8739_state *state = to_state(sd);
 102         unsigned int work_l, work_r;
 103         u8 vol_l;       /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
 104         u8 vol_r;       /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
 105         u16 mute;
 106
 107         switch (ctrl->id) {
 108         case V4L2_CID_AUDIO_VOLUME:
 109                 break;
 110
 111         default:
 112                 return -EINVAL;
 113         }
 114
 115         /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
 116         work_l = (min(65536 - state->balance->val, 32768) * state->volume->val) / 32768;
 117         work_r = (min(state->balance->val, 32768) * state->volume->val) / 32768;
 118
 119         vol_l = (long)work_l * 31 / 65535;
 120         vol_r = (long)work_r * 31 / 65535;
 121
 122         /* set audio volume etc. */
 123         mute = state->mute->val ? 0x80 : 0;
 124
 125         /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
 126          * Default setting: 0x17 = 0 dB
 127          */
 128         wm8739_write(sd, R0, (vol_l & 0x1f) | mute);
 129         wm8739_write(sd, R1, (vol_r & 0x1f) | mute);
 130         return 0;
 131 }
 132
 133 /* ------------------------------------------------------------------------ */
 134
 135 static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq)
 136 {
 137         struct wm8739_state *state = to_state(sd);
 138
 139         state->clock_freq = audiofreq;
 140         /* de-activate */
 141         wm8739_write(sd, R9, 0x000);
 142         switch (audiofreq) {
 143         case 44100:
 144                 /* 256fps, fs=44.1k */
 145                 wm8739_write(sd, R8, 0x020);
 146                 break;
 147         case 48000:
 148                 /* 256fps, fs=48k */
 149                 wm8739_write(sd, R8, 0x000);
 150                 break;
 151         case 32000:
 152                 /* 256fps, fs=32k */
 153                 wm8739_write(sd, R8, 0x018);
 154                 break;
 155         default:
 156                 break;
 157         }
 158         /* activate */
 159         wm8739_write(sd, R9, 0x001);
 160         return 0;
 161 }
 162
 163 static int wm8739_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 164 {
 165         struct i2c_client *client = v4l2_get_subdevdata(sd);
 166
 167         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8739, 0);
 168 }
 169
 170 static int wm8739_log_status(struct v4l2_subdev *sd)
 171 {
 172         struct wm8739_state *state = to_state(sd);
 173
 174         v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq);
 175         v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
 176         return 0;
 177 }
 178
 179 /* ----------------------------------------------------------------------- */
 180
 181 static const struct v4l2_ctrl_ops wm8739_ctrl_ops = {
 182         .s_ctrl = wm8739_s_ctrl,
 183 };
 184
 185 static const struct v4l2_subdev_core_ops wm8739_core_ops = {
 186         .log_status = wm8739_log_status,
 187         .g_chip_ident = wm8739_g_chip_ident,
 188         .g_ext_ctrls = v4l2_subdev_g_ext_ctrls,
 189         .try_ext_ctrls = v4l2_subdev_try_ext_ctrls,
 190         .s_ext_ctrls = v4l2_subdev_s_ext_ctrls,
 191         .g_ctrl = v4l2_subdev_g_ctrl,
 192         .s_ctrl = v4l2_subdev_s_ctrl,
 193         .queryctrl = v4l2_subdev_queryctrl,
 194         .querymenu = v4l2_subdev_querymenu,
 195 };
 196
 197 static const struct v4l2_subdev_audio_ops wm8739_audio_ops = {
 198         .s_clock_freq = wm8739_s_clock_freq,
 199 };
 200
 201 static const struct v4l2_subdev_ops wm8739_ops = {
 202         .core = &wm8739_core_ops,
 203         .audio = &wm8739_audio_ops,
 204 };
 205
 206 /* ------------------------------------------------------------------------ */
 207
 208 /* i2c implementation */
 209
 210 static int wm8739_probe(struct i2c_client *client,
 211                         const struct i2c_device_id *id)
 212 {
 213         struct wm8739_state *state;
 214         struct v4l2_subdev *sd;
 215
 216         /* Check if the adapter supports the needed features */
 217         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 218                 return -EIO;
 219
 220         v4l_info(client, "chip found @ 0x%x (%s)\n",
 221                         client->addr << 1, client->adapter->name);
 222
 223         state = kzalloc(sizeof(struct wm8739_state), GFP_KERNEL);
 224         if (state == NULL)
 225                 return -ENOMEM;
 226         sd = &state->sd;
 227         v4l2_i2c_subdev_init(sd, client, &wm8739_ops);
 228         v4l2_ctrl_handler_init(&state->hdl, 2);
 229         state->volume = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
 230                         V4L2_CID_AUDIO_VOLUME, 0, 65535, 65535 / 100, 50736);
 231         state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
 232                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
 233         state->balance = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
 234                         V4L2_CID_AUDIO_BALANCE, 0, 65535, 65535 / 100, 32768);
 235         sd->ctrl_handler = &state->hdl;
 236         if (state->hdl.error) {
 237                 int err = state->hdl.error;
 238
 239                 v4l2_ctrl_handler_free(&state->hdl);
 240                 kfree(state);
 241                 return err;
 242         }
 243         v4l2_ctrl_cluster(3, &state->volume);
 244
 245         state->clock_freq = 48000;
 246
 247         /* Initialize wm8739 */
 248
 249         /* reset */
 250         wm8739_write(sd, R15, 0x00);
 251         /* filter setting, high path, offet clear */
 252         wm8739_write(sd, R5, 0x000);
 253         /* ADC, OSC, Power Off mode Disable */
 254         wm8739_write(sd, R6, 0x000);
 255         /* Digital Audio interface format:
 256            Enable Master mode, 24 bit, MSB first/left justified */
 257         wm8739_write(sd, R7, 0x049);
 258         /* sampling control: normal, 256fs, 48KHz sampling rate */
 259         wm8739_write(sd, R8, 0x000);
 260         /* activate */
 261         wm8739_write(sd, R9, 0x001);
 262         /* set volume/mute */
 263         v4l2_ctrl_handler_setup(&state->hdl);
 264         return 0;
 265 }
 266
 267 static int wm8739_remove(struct i2c_client *client)
 268 {
 269         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 270         struct wm8739_state *state = to_state(sd);
 271
 272         v4l2_device_unregister_subdev(sd);
 273         v4l2_ctrl_handler_free(&state->hdl);
 274         kfree(to_state(sd));
 275         return 0;
 276 }
 277
 278 static const struct i2c_device_id wm8739_id[] = {
 279         { "wm8739", 0 },
 280         { }
 281 };
 282 MODULE_DEVICE_TABLE(i2c, wm8739_id);
 283
 284 static struct i2c_driver wm8739_driver = {
 285         .driver = {
 286                 .owner  = THIS_MODULE,
 287                 .name   = "wm8739",
 288         },
 289         .probe          = wm8739_probe,
 290         .remove         = wm8739_remove,
 291         .id_table       = wm8739_id,
 292 };
 293
 294 module_i2c_driver(wm8739_driver);