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/videodev.h>
  35 #include <media/v4l2-common.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         u8 input;               /* Last selected input (0-0xf) */
  58         u8 muted;
  59 };
  60
  61 static int wm8775_write(struct i2c_client *client, int reg, u16 val)
  62 {
  63         int i;
  64
  65         if (reg < 0 || reg >= TOT_REGS) {
  66                 v4l_err(client, "Invalid register R%d\n", reg);
  67                 return -1;
  68         }
  69
  70         for (i = 0; i < 3; i++)
  71                 if (i2c_smbus_write_byte_data(client,
  72                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  73                         return 0;
  74         v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
  75         return -1;
  76 }
  77
  78 static int wm8775_command(struct i2c_client *client, unsigned cmd, void *arg)
  79 {
  80         struct wm8775_state *state = i2c_get_clientdata(client);
  81         struct v4l2_routing *route = arg;
  82         struct v4l2_control *ctrl = arg;
  83
  84         switch (cmd) {
  85         case VIDIOC_INT_G_AUDIO_ROUTING:
  86                 route->input = state->input;
  87                 route->output = 0;
  88                 break;
  89
  90         case VIDIOC_INT_S_AUDIO_ROUTING:
  91                 /* There are 4 inputs and one output. Zero or more inputs
  92                    are multiplexed together to the output. Hence there are
  93                    16 combinations.
  94                    If only one input is active (the normal case) then the
  95                    input values 1, 2, 4 or 8 should be used. */
  96                 if (route->input > 15) {
  97                         v4l_err(client, "Invalid input %d.\n", route->input);
  98                         return -EINVAL;
  99                 }
 100                 state->input = route->input;
 101                 if (state->muted)
 102                         break;
 103                 wm8775_write(client, R21, 0x0c0);
 104                 wm8775_write(client, R14, 0x1d4);
 105                 wm8775_write(client, R15, 0x1d4);
 106                 wm8775_write(client, R21, 0x100 + state->input);
 107                 break;
 108
 109         case VIDIOC_G_CTRL:
 110                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 111                         return -EINVAL;
 112                 ctrl->value = state->muted;
 113                 break;
 114
 115         case VIDIOC_S_CTRL:
 116                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 117                         return -EINVAL;
 118                 state->muted = ctrl->value;
 119                 wm8775_write(client, R21, 0x0c0);
 120                 wm8775_write(client, R14, 0x1d4);
 121                 wm8775_write(client, R15, 0x1d4);
 122                 if (!state->muted)
 123                         wm8775_write(client, R21, 0x100 + state->input);
 124                 break;
 125
 126         case VIDIOC_G_CHIP_IDENT:
 127                 return v4l2_chip_ident_i2c_client(client,
 128                                 arg, V4L2_IDENT_WM8775, 0);
 129
 130         case VIDIOC_LOG_STATUS:
 131                 v4l_info(client, "Input: %d%s\n", state->input,
 132                             state->muted ? " (muted)" : "");
 133                 break;
 134
 135         case VIDIOC_S_FREQUENCY:
 136                 /* If I remove this, then it can happen that I have no
 137                    sound the first time I tune from static to a valid channel.
 138                    It's difficult to reproduce and is almost certainly related
 139                    to the zero cross detect circuit. */
 140                 wm8775_write(client, R21, 0x0c0);
 141                 wm8775_write(client, R14, 0x1d4);
 142                 wm8775_write(client, R15, 0x1d4);
 143                 wm8775_write(client, R21, 0x100 + state->input);
 144                 break;
 145
 146         default:
 147                 return -EINVAL;
 148         }
 149         return 0;
 150 }
 151
 152 /* ----------------------------------------------------------------------- */
 153
 154 /* i2c implementation */
 155
 156 /*
 157  * Generic i2c probe
 158  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 159  */
 160
 161 static int wm8775_probe(struct i2c_client *client,
 162                         const struct i2c_device_id *id)
 163 {
 164         struct wm8775_state *state;
 165
 166         /* Check if the adapter supports the needed features */
 167         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 168                 return -EIO;
 169
 170         v4l_info(client, "chip found @ 0x%x (%s)\n",
 171                         client->addr << 1, client->adapter->name);
 172
 173         state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
 174         if (state == NULL)
 175                 return -ENOMEM;
 176         state->input = 2;
 177         state->muted = 0;
 178         i2c_set_clientdata(client, state);
 179
 180         /* Initialize wm8775 */
 181
 182         /* RESET */
 183         wm8775_write(client, R23, 0x000);
 184         /* Disable zero cross detect timeout */
 185         wm8775_write(client, R7, 0x000);
 186         /* Left justified, 24-bit mode */
 187         wm8775_write(client, R11, 0x021);
 188         /* Master mode, clock ratio 256fs */
 189         wm8775_write(client, R12, 0x102);
 190         /* Powered up */
 191         wm8775_write(client, R13, 0x000);
 192         /* ADC gain +2.5dB, enable zero cross */
 193         wm8775_write(client, R14, 0x1d4);
 194         /* ADC gain +2.5dB, enable zero cross */
 195         wm8775_write(client, R15, 0x1d4);
 196         /* ALC Stereo, ALC target level -1dB FS max gain +8dB */
 197         wm8775_write(client, R16, 0x1bf);
 198         /* Enable gain control, use zero cross detection,
 199            ALC hold time 42.6 ms */
 200         wm8775_write(client, R17, 0x185);
 201         /* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */
 202         wm8775_write(client, R18, 0x0a2);
 203         /* Enable noise gate, threshold -72dBfs */
 204         wm8775_write(client, R19, 0x005);
 205         /* Transient window 4ms, lower PGA gain limit -1dB */
 206         wm8775_write(client, R20, 0x07a);
 207         /* LRBOTH = 1, use input 2. */
 208         wm8775_write(client, R21, 0x102);
 209         return 0;
 210 }
 211
 212 static int wm8775_remove(struct i2c_client *client)
 213 {
 214         kfree(i2c_get_clientdata(client));
 215         return 0;
 216 }
 217
 218 static const struct i2c_device_id wm8775_id[] = {
 219         { "wm8775", 0 },
 220         { }
 221 };
 222 MODULE_DEVICE_TABLE(i2c, wm8775_id);
 223
 224 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 225         .name = "wm8775",
 226         .driverid = I2C_DRIVERID_WM8775,
 227         .command = wm8775_command,
 228         .probe = wm8775_probe,
 229         .remove = wm8775_remove,
 230         .id_table = wm8775_id,
 231 };