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/ioctl.h>
  31 #include <asm/uaccess.h>
  32 #include <linux/i2c.h>
  33 #include <linux/i2c-id.h>
  34 #include <linux/videodev2.h>
  35 #include <media/v4l2-device.h>
  36 #include <media/v4l2-chip-ident.h>
  37 #include <media/v4l2-i2c-drv-legacy.h>
  38
  39 MODULE_DESCRIPTION("wm8775 driver");
  40 MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
  41 MODULE_LICENSE("GPL");
  42
  43 static unsigned short normal_i2c[] = { 0x36 >> 1, I2C_CLIENT_END };
  44
  45 I2C_CLIENT_INSMOD;
  46
  47
  48 /* ----------------------------------------------------------------------- */
  49
  50 enum {
  51         R7 = 7, R11 = 11,
  52         R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
  53         TOT_REGS
  54 };
  55
  56 struct wm8775_state {
  57         struct v4l2_subdev sd;
  58         u8 input;               /* Last selected input (0-0xf) */
  59         u8 muted;
  60 };
  61
  62 static inline struct wm8775_state *to_state(struct v4l2_subdev *sd)
  63 {
  64         return container_of(sd, struct wm8775_state, sd);
  65 }
  66
  67 static int wm8775_write(struct v4l2_subdev *sd, int reg, u16 val)
  68 {
  69         struct i2c_client *client = v4l2_get_subdevdata(sd);
  70         int i;
  71
  72         if (reg < 0 || reg >= TOT_REGS) {
  73                 v4l2_err(sd, "Invalid register R%d\n", reg);
  74                 return -1;
  75         }
  76
  77         for (i = 0; i < 3; i++)
  78                 if (i2c_smbus_write_byte_data(client,
  79                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  80                         return 0;
  81         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  82         return -1;
  83 }
  84
  85 static int wm8775_s_routing(struct v4l2_subdev *sd, const struct v4l2_routing *route)
  86 {
  87         struct wm8775_state *state = to_state(sd);
  88
  89         /* There are 4 inputs and one output. Zero or more inputs
  90            are multiplexed together to the output. Hence there are
  91            16 combinations.
  92            If only one input is active (the normal case) then the
  93            input values 1, 2, 4 or 8 should be used. */
  94         if (route->input > 15) {
  95                 v4l2_err(sd, "Invalid input %d.\n", route->input);
  96                 return -EINVAL;
  97         }
  98         state->input = route->input;
  99         if (state->muted)
 100                 return 0;
 101         wm8775_write(sd, R21, 0x0c0);
 102         wm8775_write(sd, R14, 0x1d4);
 103         wm8775_write(sd, R15, 0x1d4);
 104         wm8775_write(sd, R21, 0x100 + state->input);
 105         return 0;
 106 }
 107
 108 static int wm8775_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 109 {
 110         struct wm8775_state *state = to_state(sd);
 111
 112         if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 113                 return -EINVAL;
 114         ctrl->value = state->muted;
 115         return 0;
 116 }
 117
 118 static int wm8775_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 119 {
 120         struct wm8775_state *state = to_state(sd);
 121
 122         if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 123                 return -EINVAL;
 124         state->muted = ctrl->value;
 125         wm8775_write(sd, R21, 0x0c0);
 126         wm8775_write(sd, R14, 0x1d4);
 127         wm8775_write(sd, R15, 0x1d4);
 128         if (!state->muted)
 129                 wm8775_write(sd, R21, 0x100 + state->input);
 130         return 0;
 131 }
 132
 133 static int wm8775_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_chip_ident *chip)
 134 {
 135         struct i2c_client *client = v4l2_get_subdevdata(sd);
 136
 137         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8775, 0);
 138 }
 139
 140 static int wm8775_log_status(struct v4l2_subdev *sd)
 141 {
 142         struct wm8775_state *state = to_state(sd);
 143
 144         v4l2_info(sd, "Input: %d%s\n", state->input,
 145                         state->muted ? " (muted)" : "");
 146         return 0;
 147 }
 148
 149 static int wm8775_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *freq)
 150 {
 151         struct wm8775_state *state = to_state(sd);
 152
 153         /* If I remove this, then it can happen that I have no
 154            sound the first time I tune from static to a valid channel.
 155            It's difficult to reproduce and is almost certainly related
 156            to the zero cross detect circuit. */
 157         wm8775_write(sd, R21, 0x0c0);
 158         wm8775_write(sd, R14, 0x1d4);
 159         wm8775_write(sd, R15, 0x1d4);
 160         wm8775_write(sd, R21, 0x100 + state->input);
 161         return 0;
 162 }
 163
 164 static int wm8775_command(struct i2c_client *client, unsigned cmd, void *arg)
 165 {
 166         return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
 167 }
 168
 169 /* ----------------------------------------------------------------------- */
 170
 171 static const struct v4l2_subdev_core_ops wm8775_core_ops = {
 172         .log_status = wm8775_log_status,
 173         .g_chip_ident = wm8775_g_chip_ident,
 174         .g_ctrl = wm8775_g_ctrl,
 175         .s_ctrl = wm8775_s_ctrl,
 176 };
 177
 178 static const struct v4l2_subdev_tuner_ops wm8775_tuner_ops = {
 179         .s_frequency = wm8775_s_frequency,
 180 };
 181
 182 static const struct v4l2_subdev_audio_ops wm8775_audio_ops = {
 183         .s_routing = wm8775_s_routing,
 184 };
 185
 186 static const struct v4l2_subdev_ops wm8775_ops = {
 187         .core = &wm8775_core_ops,
 188         .tuner = &wm8775_tuner_ops,
 189         .audio = &wm8775_audio_ops,
 190 };
 191
 192 /* ----------------------------------------------------------------------- */
 193
 194 /* i2c implementation */
 195
 196 /*
 197  * Generic i2c probe
 198  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 199  */
 200
 201 static int wm8775_probe(struct i2c_client *client,
 202                         const struct i2c_device_id *id)
 203 {
 204         struct wm8775_state *state;
 205         struct v4l2_subdev *sd;
 206
 207         /* Check if the adapter supports the needed features */
 208         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 209                 return -EIO;
 210
 211         v4l_info(client, "chip found @ 0x%02x (%s)\n",
 212                         client->addr << 1, client->adapter->name);
 213
 214         state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
 215         if (state == NULL)
 216                 return -ENOMEM;
 217         sd = &state->sd;
 218         v4l2_i2c_subdev_init(sd, client, &wm8775_ops);
 219         state->input = 2;
 220         state->muted = 0;
 221
 222         /* Initialize wm8775 */
 223
 224         /* RESET */
 225         wm8775_write(sd, R23, 0x000);
 226         /* Disable zero cross detect timeout */
 227         wm8775_write(sd, R7, 0x000);
 228         /* Left justified, 24-bit mode */
 229         wm8775_write(sd, R11, 0x021);
 230         /* Master mode, clock ratio 256fs */
 231         wm8775_write(sd, R12, 0x102);
 232         /* Powered up */
 233         wm8775_write(sd, R13, 0x000);
 234         /* ADC gain +2.5dB, enable zero cross */
 235         wm8775_write(sd, R14, 0x1d4);
 236         /* ADC gain +2.5dB, enable zero cross */
 237         wm8775_write(sd, R15, 0x1d4);
 238         /* ALC Stereo, ALC target level -1dB FS max gain +8dB */
 239         wm8775_write(sd, R16, 0x1bf);
 240         /* Enable gain control, use zero cross detection,
 241            ALC hold time 42.6 ms */
 242         wm8775_write(sd, R17, 0x185);
 243         /* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */
 244         wm8775_write(sd, R18, 0x0a2);
 245         /* Enable noise gate, threshold -72dBfs */
 246         wm8775_write(sd, R19, 0x005);
 247         /* Transient window 4ms, lower PGA gain limit -1dB */
 248         wm8775_write(sd, R20, 0x07a);
 249         /* LRBOTH = 1, use input 2. */
 250         wm8775_write(sd, R21, 0x102);
 251         return 0;
 252 }
 253
 254 static int wm8775_remove(struct i2c_client *client)
 255 {
 256         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 257
 258         v4l2_device_unregister_subdev(sd);
 259         kfree(to_state(sd));
 260         return 0;
 261 }
 262
 263 static const struct i2c_device_id wm8775_id[] = {
 264         { "wm8775", 0 },
 265         { }
 266 };
 267 MODULE_DEVICE_TABLE(i2c, wm8775_id);
 268
 269 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 270         .name = "wm8775",
 271         .driverid = I2C_DRIVERID_WM8775,
 272         .command = wm8775_command,
 273         .probe = wm8775_probe,
 274         .remove = wm8775_remove,
 275         .id_table = wm8775_id,
 276 };