linux/drivers/media/video/tlv320aic23b.c
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   1/*
   2 * tlv320aic23b - driver version 0.0.1
   3 *
   4 * Copyright (C) 2006 Scott Alfter <salfter@ssai.us>
   5 *
   6 * Based on wm8775 driver
   7 *
   8 * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
   9 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License as published by
  13 * the Free Software Foundation; either version 2 of the License, or
  14 * (at your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 * GNU General Public License for more details.
  20 *
  21 * You should have received a copy of the GNU General Public License
  22 * along with this program; if not, write to the Free Software
  23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24 */
  25
  26#include <linux/module.h>
  27#include <linux/types.h>
  28#include <linux/slab.h>
  29#include <linux/ioctl.h>
  30#include <asm/uaccess.h>
  31#include <linux/i2c.h>
  32#include <linux/i2c-id.h>
  33#include <linux/videodev2.h>
  34#include <media/v4l2-device.h>
  35#include <media/v4l2-i2c-drv.h>
  36
  37MODULE_DESCRIPTION("tlv320aic23b driver");
  38MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
  39MODULE_LICENSE("GPL");
  40
  41
  42/* ----------------------------------------------------------------------- */
  43
  44struct tlv320aic23b_state {
  45        struct v4l2_subdev sd;
  46        u8 muted;
  47};
  48
  49static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
  50{
  51        return container_of(sd, struct tlv320aic23b_state, sd);
  52}
  53
  54static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
  55{
  56        struct i2c_client *client = v4l2_get_subdevdata(sd);
  57        int i;
  58
  59        if ((reg < 0 || reg > 9) && (reg != 15)) {
  60                v4l2_err(sd, "Invalid register R%d\n", reg);
  61                return -1;
  62        }
  63
  64        for (i = 0; i < 3; i++)
  65                if (i2c_smbus_write_byte_data(client,
  66                                (reg << 1) | (val >> 8), val & 0xff) == 0)
  67                        return 0;
  68        v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  69        return -1;
  70}
  71
  72static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
  73{
  74        switch (freq) {
  75        case 32000: /* set sample rate to 32 kHz */
  76                tlv320aic23b_write(sd, 8, 0x018);
  77                break;
  78        case 44100: /* set sample rate to 44.1 kHz */
  79                tlv320aic23b_write(sd, 8, 0x022);
  80                break;
  81        case 48000: /* set sample rate to 48 kHz */
  82                tlv320aic23b_write(sd, 8, 0x000);
  83                break;
  84        default:
  85                return -EINVAL;
  86        }
  87        return 0;
  88}
  89
  90static int tlv320aic23b_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  91{
  92        struct tlv320aic23b_state *state = to_state(sd);
  93
  94        if (ctrl->id != V4L2_CID_AUDIO_MUTE)
  95                return -EINVAL;
  96        ctrl->value = state->muted;
  97        return 0;
  98}
  99
 100static int tlv320aic23b_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 101{
 102        struct tlv320aic23b_state *state = to_state(sd);
 103
 104        if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 105                return -EINVAL;
 106        state->muted = ctrl->value;
 107        tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
 108        /* set gain on both channels to +3.0 dB */
 109        if (!state->muted)
 110                tlv320aic23b_write(sd, 0, 0x119);
 111        return 0;
 112}
 113
 114static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
 115{
 116        struct tlv320aic23b_state *state = to_state(sd);
 117
 118        v4l2_info(sd, "Input: %s\n", state->muted ? "muted" : "active");
 119        return 0;
 120}
 121
 122/* ----------------------------------------------------------------------- */
 123
 124static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
 125        .log_status = tlv320aic23b_log_status,
 126        .g_ctrl = tlv320aic23b_g_ctrl,
 127        .s_ctrl = tlv320aic23b_s_ctrl,
 128};
 129
 130static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
 131        .s_clock_freq = tlv320aic23b_s_clock_freq,
 132};
 133
 134static const struct v4l2_subdev_ops tlv320aic23b_ops = {
 135        .core = &tlv320aic23b_core_ops,
 136        .audio = &tlv320aic23b_audio_ops,
 137};
 138
 139/* ----------------------------------------------------------------------- */
 140
 141/* i2c implementation */
 142
 143/*
 144 * Generic i2c probe
 145 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 146 */
 147
 148static int tlv320aic23b_probe(struct i2c_client *client,
 149                              const struct i2c_device_id *id)
 150{
 151        struct tlv320aic23b_state *state;
 152        struct v4l2_subdev *sd;
 153
 154        /* Check if the adapter supports the needed features */
 155        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 156                return -EIO;
 157
 158        v4l_info(client, "chip found @ 0x%x (%s)\n",
 159                        client->addr << 1, client->adapter->name);
 160
 161        state = kzalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
 162        if (state == NULL)
 163                return -ENOMEM;
 164        sd = &state->sd;
 165        v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
 166        state->muted = 0;
 167
 168        /* Initialize tlv320aic23b */
 169
 170        /* RESET */
 171        tlv320aic23b_write(sd, 15, 0x000);
 172        /* turn off DAC & mic input */
 173        tlv320aic23b_write(sd, 6, 0x00A);
 174        /* left-justified, 24-bit, master mode */
 175        tlv320aic23b_write(sd, 7, 0x049);
 176        /* set gain on both channels to +3.0 dB */
 177        tlv320aic23b_write(sd, 0, 0x119);
 178        /* set sample rate to 48 kHz */
 179        tlv320aic23b_write(sd, 8, 0x000);
 180        /* activate digital interface */
 181        tlv320aic23b_write(sd, 9, 0x001);
 182        return 0;
 183}
 184
 185static int tlv320aic23b_remove(struct i2c_client *client)
 186{
 187        struct v4l2_subdev *sd = i2c_get_clientdata(client);
 188
 189        v4l2_device_unregister_subdev(sd);
 190        kfree(to_state(sd));
 191        return 0;
 192}
 193
 194/* ----------------------------------------------------------------------- */
 195
 196static const struct i2c_device_id tlv320aic23b_id[] = {
 197        { "tlv320aic23b", 0 },
 198        { }
 199};
 200MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
 201
 202static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 203        .name = "tlv320aic23b",
 204        .probe = tlv320aic23b_probe,
 205        .remove = tlv320aic23b_remove,
 206        .id_table = tlv320aic23b_id,
 207};
 208