drivers/media/video/wm8775.c

   1 /*
   2  * wm8775 - driver version 0.0.1
   3  *
   4  * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
   5  *
   6  * Based on saa7115 driver
   7  *
   8  * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
   9  * - Cleanup
  10  * - V4L2 API update
  11  * - sound fixes
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/types.h>
  30 #include <linux/slab.h>
  31 #include <linux/ioctl.h>
  32 #include <asm/uaccess.h>
  33 #include <linux/i2c.h>
  34 #include <linux/videodev2.h>
  35 #include <media/v4l2-device.h>
  36 #include <media/v4l2-chip-ident.h>
  37 #include <media/v4l2-ctrls.h>
  38 #include <media/wm8775.h>
  39
  40 MODULE_DESCRIPTION("wm8775 driver");
  41 MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
  42 MODULE_LICENSE("GPL");
  43
  44
  45
  46 /* ----------------------------------------------------------------------- */
  47
  48 enum {
  49         R7 = 7, R11 = 11,
  50         R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
  51         TOT_REGS
  52 };
  53
  54 #define ALC_HOLD 0x85 /* R17: use zero cross detection, ALC hold time 42.6 ms */
  55 #define ALC_EN 0x100  /* R17: ALC enable */
  56
  57 struct wm8775_state {
  58         struct v4l2_subdev sd;
  59         struct v4l2_ctrl_handler hdl;
  60         struct v4l2_ctrl *mute;
  61         struct v4l2_ctrl *vol;
  62         struct v4l2_ctrl *bal;
  63         struct v4l2_ctrl *loud;
  64         u8 input;               /* Last selected input (0-0xf) */
  65 };
  66
  67 static inline struct wm8775_state *to_state(struct v4l2_subdev *sd)
  68 {
  69         return container_of(sd, struct wm8775_state, sd);
  70 }
  71
  72 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
  73 {
  74         return &container_of(ctrl->handler, struct wm8775_state, hdl)->sd;
  75 }
  76
  77 static int wm8775_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         for (i = 0; i < 3; i++)
  88                 if (i2c_smbus_write_byte_data(client,
  89                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  90                         return 0;
  91         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  92         return -1;
  93 }
  94
  95 static void wm8775_set_audio(struct v4l2_subdev *sd, int quietly)
  96 {
  97         struct wm8775_state *state = to_state(sd);
  98         u8 vol_l, vol_r;
  99         int muted = 0 != state->mute->val;
 100         u16 volume = (u16)state->vol->val;
 101         u16 balance = (u16)state->bal->val;
 102
 103         /* normalize ( 65535 to 0 -> 255 to 0 (+24dB to -103dB) ) */
 104         vol_l = (min(65536 - balance, 32768) * volume) >> 23;
 105         vol_r = (min(balance, (u16)32768) * volume) >> 23;
 106
 107         /* Mute */
 108         if (muted || quietly)
 109                 wm8775_write(sd, R21, 0x0c0 | state->input);
 110
 111         wm8775_write(sd, R14, vol_l | 0x100); /* 0x100= Left channel ADC zero cross enable */
 112         wm8775_write(sd, R15, vol_r | 0x100); /* 0x100= Right channel ADC zero cross enable */
 113
 114         /* Un-mute */
 115         if (!muted)
 116                 wm8775_write(sd, R21, state->input);
 117 }
 118
 119 static int wm8775_s_routing(struct v4l2_subdev *sd,
 120                             u32 input, u32 output, u32 config)
 121 {
 122         struct wm8775_state *state = to_state(sd);
 123
 124         /* There are 4 inputs and one output. Zero or more inputs
 125            are multiplexed together to the output. Hence there are
 126            16 combinations.
 127            If only one input is active (the normal case) then the
 128            input values 1, 2, 4 or 8 should be used. */
 129         if (input > 15) {
 130                 v4l2_err(sd, "Invalid input %d.\n", input);
 131                 return -EINVAL;
 132         }
 133         state->input = input;
 134         if (!v4l2_ctrl_g_ctrl(state->mute))
 135                 return 0;
 136         if (!v4l2_ctrl_g_ctrl(state->vol))
 137                 return 0;
 138         if (!v4l2_ctrl_g_ctrl(state->bal))
 139                 return 0;
 140         wm8775_set_audio(sd, 1);
 141         return 0;
 142 }
 143
 144 static int wm8775_s_ctrl(struct v4l2_ctrl *ctrl)
 145 {
 146         struct v4l2_subdev *sd = to_sd(ctrl);
 147
 148         switch (ctrl->id) {
 149         case V4L2_CID_AUDIO_MUTE:
 150         case V4L2_CID_AUDIO_VOLUME:
 151         case V4L2_CID_AUDIO_BALANCE:
 152                 wm8775_set_audio(sd, 0);
 153                 return 0;
 154         case V4L2_CID_AUDIO_LOUDNESS:
 155                 wm8775_write(sd, R17, (ctrl->val ? ALC_EN : 0) | ALC_HOLD);
 156                 return 0;
 157         }
 158         return -EINVAL;
 159 }
 160
 161 static int wm8775_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 162 {
 163         struct i2c_client *client = v4l2_get_subdevdata(sd);
 164
 165         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8775, 0);
 166 }
 167
 168 static int wm8775_log_status(struct v4l2_subdev *sd)
 169 {
 170         struct wm8775_state *state = to_state(sd);
 171
 172         v4l2_info(sd, "Input: %d\n", state->input);
 173         v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
 174         return 0;
 175 }
 176
 177 static int wm8775_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *freq)
 178 {
 179         wm8775_set_audio(sd, 0);
 180         return 0;
 181 }
 182
 183 /* ----------------------------------------------------------------------- */
 184
 185 static const struct v4l2_ctrl_ops wm8775_ctrl_ops = {
 186         .s_ctrl = wm8775_s_ctrl,
 187 };
 188
 189 static const struct v4l2_subdev_core_ops wm8775_core_ops = {
 190         .log_status = wm8775_log_status,
 191         .g_chip_ident = wm8775_g_chip_ident,
 192         .g_ext_ctrls = v4l2_subdev_g_ext_ctrls,
 193         .try_ext_ctrls = v4l2_subdev_try_ext_ctrls,
 194         .s_ext_ctrls = v4l2_subdev_s_ext_ctrls,
 195         .g_ctrl = v4l2_subdev_g_ctrl,
 196         .s_ctrl = v4l2_subdev_s_ctrl,
 197         .queryctrl = v4l2_subdev_queryctrl,
 198         .querymenu = v4l2_subdev_querymenu,
 199 };
 200
 201 static const struct v4l2_subdev_tuner_ops wm8775_tuner_ops = {
 202         .s_frequency = wm8775_s_frequency,
 203 };
 204
 205 static const struct v4l2_subdev_audio_ops wm8775_audio_ops = {
 206         .s_routing = wm8775_s_routing,
 207 };
 208
 209 static const struct v4l2_subdev_ops wm8775_ops = {
 210         .core = &wm8775_core_ops,
 211         .tuner = &wm8775_tuner_ops,
 212         .audio = &wm8775_audio_ops,
 213 };
 214
 215 /* ----------------------------------------------------------------------- */
 216
 217 /* i2c implementation */
 218
 219 /*
 220  * Generic i2c probe
 221  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 222  */
 223
 224 static int wm8775_probe(struct i2c_client *client,
 225                         const struct i2c_device_id *id)
 226 {
 227         struct wm8775_state *state;
 228         struct v4l2_subdev *sd;
 229         int err;
 230
 231         /* Check if the adapter supports the needed features */
 232         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 233                 return -EIO;
 234
 235         v4l_info(client, "chip found @ 0x%02x (%s)\n",
 236                         client->addr << 1, client->adapter->name);
 237
 238         state = kzalloc(sizeof(struct wm8775_state), GFP_KERNEL);
 239         if (state == NULL)
 240                 return -ENOMEM;
 241         sd = &state->sd;
 242         v4l2_i2c_subdev_init(sd, client, &wm8775_ops);
 243         sd->grp_id = WM8775_GID; /* subdev group id */
 244         state->input = 2;
 245
 246         v4l2_ctrl_handler_init(&state->hdl, 4);
 247         state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
 248                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
 249         state->vol = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
 250                         V4L2_CID_AUDIO_VOLUME, 0, 65535, (65535+99)/100, 0xCF00); /* 0dB*/
 251         state->bal = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
 252                         V4L2_CID_AUDIO_BALANCE, 0, 65535, (65535+99)/100, 32768);
 253         state->loud = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
 254                         V4L2_CID_AUDIO_LOUDNESS, 0, 1, 1, 1);
 255         sd->ctrl_handler = &state->hdl;
 256         err = state->hdl.error;
 257         if (err) {
 258                 v4l2_ctrl_handler_free(&state->hdl);
 259                 kfree(state);
 260                 return err;
 261         }
 262
 263         /* Initialize wm8775 */
 264
 265         /* RESET */
 266         wm8775_write(sd, R23, 0x000);
 267         /* Disable zero cross detect timeout */
 268         wm8775_write(sd, R7, 0x000);
 269         /* HPF enable, I2S mode, 24-bit */
 270         wm8775_write(sd, R11, 0x022);
 271         /* Master mode, clock ratio 256fs */
 272         wm8775_write(sd, R12, 0x102);
 273         /* Powered up */
 274         wm8775_write(sd, R13, 0x000);
 275         /* ALC stereo, ALC target level -5dB FS, ALC max gain +8dB */
 276         wm8775_write(sd, R16, 0x1bb);
 277         /* Set ALC mode and hold time */
 278         wm8775_write(sd, R17, (state->loud->val ? ALC_EN : 0) | ALC_HOLD);
 279         /* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */
 280         wm8775_write(sd, R18, 0x0a2);
 281         /* Enable noise gate, threshold -72dBfs */
 282         wm8775_write(sd, R19, 0x005);
 283         /* Transient window 4ms, ALC min gain -5dB  */
 284         wm8775_write(sd, R20, 0x0fb);
 285
 286         wm8775_set_audio(sd, 1);      /* set volume/mute/mux */
 287
 288         return 0;
 289 }
 290
 291 static int wm8775_remove(struct i2c_client *client)
 292 {
 293         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 294         struct wm8775_state *state = to_state(sd);
 295
 296         v4l2_device_unregister_subdev(sd);
 297         v4l2_ctrl_handler_free(&state->hdl);
 298         kfree(state);
 299         return 0;
 300 }
 301
 302 static const struct i2c_device_id wm8775_id[] = {
 303         { "wm8775", 0 },
 304         { }
 305 };
 306 MODULE_DEVICE_TABLE(i2c, wm8775_id);
 307
 308 static struct i2c_driver wm8775_driver = {
 309         .driver = {
 310                 .owner  = THIS_MODULE,
 311                 .name   = "wm8775",
 312         },
 313         .probe          = wm8775_probe,
 314         .remove         = wm8775_remove,
 315         .id_table       = wm8775_id,
 316 };
 317
 318 static __init int init_wm8775(void)
 319 {
 320         return i2c_add_driver(&wm8775_driver);
 321 }
 322
 323 static __exit void exit_wm8775(void)
 324 {
 325         i2c_del_driver(&wm8775_driver);
 326 }
 327
 328 module_init(init_wm8775);
 329 module_exit(exit_wm8775);