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
  46 I2C_CLIENT_INSMOD;
  47
  48
  49 /* ----------------------------------------------------------------------- */
  50
  51 enum {
  52         R7 = 7, R11 = 11,
  53         R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
  54         TOT_REGS
  55 };
  56
  57 struct wm8775_state {
  58         u8 input;               /* Last selected input (0-0xf) */
  59         u8 muted;
  60 };
  61
  62 static int wm8775_write(struct i2c_client *client, int reg, u16 val)
  63 {
  64         int i;
  65
  66         if (reg < 0 || reg >= TOT_REGS) {
  67                 v4l_err(client, "Invalid register R%d\n", reg);
  68                 return -1;
  69         }
  70
  71         for (i = 0; i < 3; i++)
  72                 if (i2c_smbus_write_byte_data(client,
  73                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  74                         return 0;
  75         v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
  76         return -1;
  77 }
  78
  79 static int wm8775_command(struct i2c_client *client, unsigned cmd, void *arg)
  80 {
  81         struct wm8775_state *state = i2c_get_clientdata(client);
  82         struct v4l2_routing *route = arg;
  83         struct v4l2_control *ctrl = arg;
  84
  85         switch (cmd) {
  86         case VIDIOC_INT_G_AUDIO_ROUTING:
  87                 route->input = state->input;
  88                 route->output = 0;
  89                 break;
  90
  91         case VIDIOC_INT_S_AUDIO_ROUTING:
  92                 /* There are 4 inputs and one output. Zero or more inputs
  93                    are multiplexed together to the output. Hence there are
  94                    16 combinations.
  95                    If only one input is active (the normal case) then the
  96                    input values 1, 2, 4 or 8 should be used. */
  97                 if (route->input > 15) {
  98                         v4l_err(client, "Invalid input %d.\n", route->input);
  99                         return -EINVAL;
 100                 }
 101                 state->input = route->input;
 102                 if (state->muted)
 103                         break;
 104                 wm8775_write(client, R21, 0x0c0);
 105                 wm8775_write(client, R14, 0x1d4);
 106                 wm8775_write(client, R15, 0x1d4);
 107                 wm8775_write(client, R21, 0x100 + state->input);
 108                 break;
 109
 110         case VIDIOC_G_CTRL:
 111                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 112                         return -EINVAL;
 113                 ctrl->value = state->muted;
 114                 break;
 115
 116         case VIDIOC_S_CTRL:
 117                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 118                         return -EINVAL;
 119                 state->muted = ctrl->value;
 120                 wm8775_write(client, R21, 0x0c0);
 121                 wm8775_write(client, R14, 0x1d4);
 122                 wm8775_write(client, R15, 0x1d4);
 123                 if (!state->muted)
 124                         wm8775_write(client, R21, 0x100 + state->input);
 125                 break;
 126
 127         case VIDIOC_G_CHIP_IDENT:
 128                 return v4l2_chip_ident_i2c_client(client,
 129                                 arg, V4L2_IDENT_WM8775, 0);
 130
 131         case VIDIOC_LOG_STATUS:
 132                 v4l_info(client, "Input: %d%s\n", state->input,
 133                             state->muted ? " (muted)" : "");
 134                 break;
 135
 136         case VIDIOC_S_FREQUENCY:
 137                 /* If I remove this, then it can happen that I have no
 138                    sound the first time I tune from static to a valid channel.
 139                    It's difficult to reproduce and is almost certainly related
 140                    to the zero cross detect circuit. */
 141                 wm8775_write(client, R21, 0x0c0);
 142                 wm8775_write(client, R14, 0x1d4);
 143                 wm8775_write(client, R15, 0x1d4);
 144                 wm8775_write(client, R21, 0x100 + state->input);
 145                 break;
 146
 147         default:
 148                 return -EINVAL;
 149         }
 150         return 0;
 151 }
 152
 153 /* ----------------------------------------------------------------------- */
 154
 155 /* i2c implementation */
 156
 157 /*
 158  * Generic i2c probe
 159  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 160  */
 161
 162 static int wm8775_probe(struct i2c_client *client)
 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 struct v4l2_i2c_driver_data v4l2_i2c_data = {
 219         .name = "wm8775",
 220         .driverid = I2C_DRIVERID_WM8775,
 221         .command = wm8775_command,
 222         .probe = wm8775_probe,
 223         .remove = wm8775_remove,
 224 };
 225