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.h>
  38
  39 MODULE_DESCRIPTION("wm8775 driver");
  40 MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
  41 MODULE_LICENSE("GPL");
  42
  43
  44
  45 /* ----------------------------------------------------------------------- */
  46
  47 enum {
  48         R7 = 7, R11 = 11,
  49         R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
  50         TOT_REGS
  51 };
  52
  53 struct wm8775_state {
  54         struct v4l2_subdev sd;
  55         u8 input;               /* Last selected input (0-0xf) */
  56         u8 muted;
  57 };
  58
  59 static inline struct wm8775_state *to_state(struct v4l2_subdev *sd)
  60 {
  61         return container_of(sd, struct wm8775_state, sd);
  62 }
  63
  64 static int wm8775_write(struct v4l2_subdev *sd, int reg, u16 val)
  65 {
  66         struct i2c_client *client = v4l2_get_subdevdata(sd);
  67         int i;
  68
  69         if (reg < 0 || reg >= TOT_REGS) {
  70                 v4l2_err(sd, "Invalid register R%d\n", reg);
  71                 return -1;
  72         }
  73
  74         for (i = 0; i < 3; i++)
  75                 if (i2c_smbus_write_byte_data(client,
  76                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  77                         return 0;
  78         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  79         return -1;
  80 }
  81
  82 static int wm8775_s_routing(struct v4l2_subdev *sd,
  83                             u32 input, u32 output, u32 config)
  84 {
  85         struct wm8775_state *state = to_state(sd);
  86
  87         /* There are 4 inputs and one output. Zero or more inputs
  88            are multiplexed together to the output. Hence there are
  89            16 combinations.
  90            If only one input is active (the normal case) then the
  91            input values 1, 2, 4 or 8 should be used. */
  92         if (input > 15) {
  93                 v4l2_err(sd, "Invalid input %d.\n", input);
  94                 return -EINVAL;
  95         }
  96         state->input = input;
  97         if (state->muted)
  98                 return 0;
  99         wm8775_write(sd, R21, 0x0c0);
 100         wm8775_write(sd, R14, 0x1d4);
 101         wm8775_write(sd, R15, 0x1d4);
 102         wm8775_write(sd, R21, 0x100 + state->input);
 103         return 0;
 104 }
 105
 106 static int wm8775_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 107 {
 108         struct wm8775_state *state = to_state(sd);
 109
 110         if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 111                 return -EINVAL;
 112         ctrl->value = state->muted;
 113         return 0;
 114 }
 115
 116 static int wm8775_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 117 {
 118         struct wm8775_state *state = to_state(sd);
 119
 120         if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 121                 return -EINVAL;
 122         state->muted = ctrl->value;
 123         wm8775_write(sd, R21, 0x0c0);
 124         wm8775_write(sd, R14, 0x1d4);
 125         wm8775_write(sd, R15, 0x1d4);
 126         if (!state->muted)
 127                 wm8775_write(sd, R21, 0x100 + state->input);
 128         return 0;
 129 }
 130
 131 static int wm8775_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 132 {
 133         struct i2c_client *client = v4l2_get_subdevdata(sd);
 134
 135         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8775, 0);
 136 }
 137
 138 static int wm8775_log_status(struct v4l2_subdev *sd)
 139 {
 140         struct wm8775_state *state = to_state(sd);
 141
 142         v4l2_info(sd, "Input: %d%s\n", state->input,
 143                         state->muted ? " (muted)" : "");
 144         return 0;
 145 }
 146
 147 static int wm8775_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *freq)
 148 {
 149         struct wm8775_state *state = to_state(sd);
 150
 151         /* If I remove this, then it can happen that I have no
 152            sound the first time I tune from static to a valid channel.
 153            It's difficult to reproduce and is almost certainly related
 154            to the zero cross detect circuit. */
 155         wm8775_write(sd, R21, 0x0c0);
 156         wm8775_write(sd, R14, 0x1d4);
 157         wm8775_write(sd, R15, 0x1d4);
 158         wm8775_write(sd, R21, 0x100 + state->input);
 159         return 0;
 160 }
 161
 162 /* ----------------------------------------------------------------------- */
 163
 164 static const struct v4l2_subdev_core_ops wm8775_core_ops = {
 165         .log_status = wm8775_log_status,
 166         .g_chip_ident = wm8775_g_chip_ident,
 167         .g_ctrl = wm8775_g_ctrl,
 168         .s_ctrl = wm8775_s_ctrl,
 169 };
 170
 171 static const struct v4l2_subdev_tuner_ops wm8775_tuner_ops = {
 172         .s_frequency = wm8775_s_frequency,
 173 };
 174
 175 static const struct v4l2_subdev_audio_ops wm8775_audio_ops = {
 176         .s_routing = wm8775_s_routing,
 177 };
 178
 179 static const struct v4l2_subdev_ops wm8775_ops = {
 180         .core = &wm8775_core_ops,
 181         .tuner = &wm8775_tuner_ops,
 182         .audio = &wm8775_audio_ops,
 183 };
 184
 185 /* ----------------------------------------------------------------------- */
 186
 187 /* i2c implementation */
 188
 189 /*
 190  * Generic i2c probe
 191  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 192  */
 193
 194 static int wm8775_probe(struct i2c_client *client,
 195                         const struct i2c_device_id *id)
 196 {
 197         struct wm8775_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%02x (%s)\n",
 205                         client->addr << 1, client->adapter->name);
 206
 207         state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
 208         if (state == NULL)
 209                 return -ENOMEM;
 210         sd = &state->sd;
 211         v4l2_i2c_subdev_init(sd, client, &wm8775_ops);
 212         state->input = 2;
 213         state->muted = 0;
 214
 215         /* Initialize wm8775 */
 216
 217         /* RESET */
 218         wm8775_write(sd, R23, 0x000);
 219         /* Disable zero cross detect timeout */
 220         wm8775_write(sd, R7, 0x000);
 221         /* Left justified, 24-bit mode */
 222         wm8775_write(sd, R11, 0x021);
 223         /* Master mode, clock ratio 256fs */
 224         wm8775_write(sd, R12, 0x102);
 225         /* Powered up */
 226         wm8775_write(sd, R13, 0x000);
 227         /* ADC gain +2.5dB, enable zero cross */
 228         wm8775_write(sd, R14, 0x1d4);
 229         /* ADC gain +2.5dB, enable zero cross */
 230         wm8775_write(sd, R15, 0x1d4);
 231         /* ALC Stereo, ALC target level -1dB FS max gain +8dB */
 232         wm8775_write(sd, R16, 0x1bf);
 233         /* Enable gain control, use zero cross detection,
 234            ALC hold time 42.6 ms */
 235         wm8775_write(sd, R17, 0x185);
 236         /* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */
 237         wm8775_write(sd, R18, 0x0a2);
 238         /* Enable noise gate, threshold -72dBfs */
 239         wm8775_write(sd, R19, 0x005);
 240         /* Transient window 4ms, lower PGA gain limit -1dB */
 241         wm8775_write(sd, R20, 0x07a);
 242         /* LRBOTH = 1, use input 2. */
 243         wm8775_write(sd, R21, 0x102);
 244         return 0;
 245 }
 246
 247 static int wm8775_remove(struct i2c_client *client)
 248 {
 249         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 250
 251         v4l2_device_unregister_subdev(sd);
 252         kfree(to_state(sd));
 253         return 0;
 254 }
 255
 256 static const struct i2c_device_id wm8775_id[] = {
 257         { "wm8775", 0 },
 258         { }
 259 };
 260 MODULE_DEVICE_TABLE(i2c, wm8775_id);
 261
 262 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 263         .name = "wm8775",
 264         .probe = wm8775_probe,
 265         .remove = wm8775_remove,
 266         .id_table = wm8775_id,
 267 };