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/i2c-id.h>
  35 #include <linux/videodev2.h>
  36 #include <media/v4l2-device.h>
  37 #include <media/v4l2-chip-ident.h>
  38 #include <media/v4l2-i2c-drv.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 struct wm8775_state {
  55         struct v4l2_subdev sd;
  56         u8 input;               /* Last selected input (0-0xf) */
  57         u8 muted;
  58 };
  59
  60 static inline struct wm8775_state *to_state(struct v4l2_subdev *sd)
  61 {
  62         return container_of(sd, struct wm8775_state, sd);
  63 }
  64
  65 static int wm8775_write(struct v4l2_subdev *sd, int reg, u16 val)
  66 {
  67         struct i2c_client *client = v4l2_get_subdevdata(sd);
  68         int i;
  69
  70         if (reg < 0 || reg >= TOT_REGS) {
  71                 v4l2_err(sd, "Invalid register R%d\n", reg);
  72                 return -1;
  73         }
  74
  75         for (i = 0; i < 3; i++)
  76                 if (i2c_smbus_write_byte_data(client,
  77                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  78                         return 0;
  79         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  80         return -1;
  81 }
  82
  83 static int wm8775_s_routing(struct v4l2_subdev *sd,
  84                             u32 input, u32 output, u32 config)
  85 {
  86         struct wm8775_state *state = to_state(sd);
  87
  88         /* There are 4 inputs and one output. Zero or more inputs
  89            are multiplexed together to the output. Hence there are
  90            16 combinations.
  91            If only one input is active (the normal case) then the
  92            input values 1, 2, 4 or 8 should be used. */
  93         if (input > 15) {
  94                 v4l2_err(sd, "Invalid input %d.\n", input);
  95                 return -EINVAL;
  96         }
  97         state->input = input;
  98         if (state->muted)
  99                 return 0;
 100         wm8775_write(sd, R21, 0x0c0);
 101         wm8775_write(sd, R14, 0x1d4);
 102         wm8775_write(sd, R15, 0x1d4);
 103         wm8775_write(sd, R21, 0x100 + state->input);
 104         return 0;
 105 }
 106
 107 static int wm8775_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 108 {
 109         struct wm8775_state *state = to_state(sd);
 110
 111         if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 112                 return -EINVAL;
 113         ctrl->value = state->muted;
 114         return 0;
 115 }
 116
 117 static int wm8775_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 118 {
 119         struct wm8775_state *state = to_state(sd);
 120
 121         if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 122                 return -EINVAL;
 123         state->muted = ctrl->value;
 124         wm8775_write(sd, R21, 0x0c0);
 125         wm8775_write(sd, R14, 0x1d4);
 126         wm8775_write(sd, R15, 0x1d4);
 127         if (!state->muted)
 128                 wm8775_write(sd, R21, 0x100 + state->input);
 129         return 0;
 130 }
 131
 132 static int wm8775_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 133 {
 134         struct i2c_client *client = v4l2_get_subdevdata(sd);
 135
 136         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8775, 0);
 137 }
 138
 139 static int wm8775_log_status(struct v4l2_subdev *sd)
 140 {
 141         struct wm8775_state *state = to_state(sd);
 142
 143         v4l2_info(sd, "Input: %d%s\n", state->input,
 144                         state->muted ? " (muted)" : "");
 145         return 0;
 146 }
 147
 148 static int wm8775_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *freq)
 149 {
 150         struct wm8775_state *state = to_state(sd);
 151
 152         /* If I remove this, then it can happen that I have no
 153            sound the first time I tune from static to a valid channel.
 154            It's difficult to reproduce and is almost certainly related
 155            to the zero cross detect circuit. */
 156         wm8775_write(sd, R21, 0x0c0);
 157         wm8775_write(sd, R14, 0x1d4);
 158         wm8775_write(sd, R15, 0x1d4);
 159         wm8775_write(sd, R21, 0x100 + state->input);
 160         return 0;
 161 }
 162
 163 /* ----------------------------------------------------------------------- */
 164
 165 static const struct v4l2_subdev_core_ops wm8775_core_ops = {
 166         .log_status = wm8775_log_status,
 167         .g_chip_ident = wm8775_g_chip_ident,
 168         .g_ctrl = wm8775_g_ctrl,
 169         .s_ctrl = wm8775_s_ctrl,
 170 };
 171
 172 static const struct v4l2_subdev_tuner_ops wm8775_tuner_ops = {
 173         .s_frequency = wm8775_s_frequency,
 174 };
 175
 176 static const struct v4l2_subdev_audio_ops wm8775_audio_ops = {
 177         .s_routing = wm8775_s_routing,
 178 };
 179
 180 static const struct v4l2_subdev_ops wm8775_ops = {
 181         .core = &wm8775_core_ops,
 182         .tuner = &wm8775_tuner_ops,
 183         .audio = &wm8775_audio_ops,
 184 };
 185
 186 /* ----------------------------------------------------------------------- */
 187
 188 /* i2c implementation */
 189
 190 /*
 191  * Generic i2c probe
 192  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 193  */
 194
 195 static int wm8775_probe(struct i2c_client *client,
 196                         const struct i2c_device_id *id)
 197 {
 198         struct wm8775_state *state;
 199         struct v4l2_subdev *sd;
 200
 201         /* Check if the adapter supports the needed features */
 202         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 203                 return -EIO;
 204
 205         v4l_info(client, "chip found @ 0x%02x (%s)\n",
 206                         client->addr << 1, client->adapter->name);
 207
 208         state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
 209         if (state == NULL)
 210                 return -ENOMEM;
 211         sd = &state->sd;
 212         v4l2_i2c_subdev_init(sd, client, &wm8775_ops);
 213         state->input = 2;
 214         state->muted = 0;
 215
 216         /* Initialize wm8775 */
 217
 218         /* RESET */
 219         wm8775_write(sd, R23, 0x000);
 220         /* Disable zero cross detect timeout */
 221         wm8775_write(sd, R7, 0x000);
 222         /* Left justified, 24-bit mode */
 223         wm8775_write(sd, R11, 0x021);
 224         /* Master mode, clock ratio 256fs */
 225         wm8775_write(sd, R12, 0x102);
 226         /* Powered up */
 227         wm8775_write(sd, R13, 0x000);
 228         /* ADC gain +2.5dB, enable zero cross */
 229         wm8775_write(sd, R14, 0x1d4);
 230         /* ADC gain +2.5dB, enable zero cross */
 231         wm8775_write(sd, R15, 0x1d4);
 232         /* ALC Stereo, ALC target level -1dB FS max gain +8dB */
 233         wm8775_write(sd, R16, 0x1bf);
 234         /* Enable gain control, use zero cross detection,
 235            ALC hold time 42.6 ms */
 236         wm8775_write(sd, R17, 0x185);
 237         /* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */
 238         wm8775_write(sd, R18, 0x0a2);
 239         /* Enable noise gate, threshold -72dBfs */
 240         wm8775_write(sd, R19, 0x005);
 241         /* Transient window 4ms, lower PGA gain limit -1dB */
 242         wm8775_write(sd, R20, 0x07a);
 243         /* LRBOTH = 1, use input 2. */
 244         wm8775_write(sd, R21, 0x102);
 245         return 0;
 246 }
 247
 248 static int wm8775_remove(struct i2c_client *client)
 249 {
 250         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 251
 252         v4l2_device_unregister_subdev(sd);
 253         kfree(to_state(sd));
 254         return 0;
 255 }
 256
 257 static const struct i2c_device_id wm8775_id[] = {
 258         { "wm8775", 0 },
 259         { }
 260 };
 261 MODULE_DEVICE_TABLE(i2c, wm8775_id);
 262
 263 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 264         .name = "wm8775",
 265         .probe = wm8775_probe,
 266         .remove = wm8775_remove,
 267         .id_table = wm8775_id,
 268 };