/*
* tlv320aic23b - driver version 0.0.1
*
* Copyright (C) 2006 Scott Alfter <salfter@ssai.us>
*
* Based on wm8775 driver
*
* Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
* Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/ioctl.h>
#include <asm/uaccess.h>
#include <linux/i2c.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
MODULE_DESCRIPTION("tlv320aic23b driver");
MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
MODULE_LICENSE("GPL");
/* ----------------------------------------------------------------------- */
struct tlv320aic23b_state {
struct v4l2_subdev sd;
u8 muted;
};
static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
{
return container_of(sd, struct tlv320aic23b_state, sd);
}
static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
int i;
if ((reg < 0 || reg > 9) && (reg != 15)) {
v4l2_err(sd, "Invalid register R%d\n", reg);
return -1;
}
for (i = 0; i < 3; i++)
if (i2c_smbus_write_byte_data(client,
(reg << 1) | (val >> 8), val & 0xff) == 0)
return 0;
v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
return -1;
}
static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
{
switch (freq) {
case 32000: /* set sample rate to 32 kHz */
tlv320aic23b_write(sd, 8, 0x018);
break;
case 44100: /* set sample rate to 44.1 kHz */
tlv320aic23b_write(sd, 8, 0x022);
break;
case 48000: /* set sample rate to 48 kHz */
tlv320aic23b_write(sd, 8, 0x000);
break;
default:
return -EINVAL;
}
return 0;
}
static int tlv320aic23b_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
{
struct tlv320aic23b_state *state = to_state(sd);
if (ctrl->id != V4L2_CID_AUDIO_MUTE)
return -EINVAL;
ctrl->value = state->muted;
return 0;
}
static int tlv320aic23b_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
{
struct tlv320aic23b_state *state = to_state(sd);
if (ctrl->id != V4L2_CID_AUDIO_MUTE)
return -EINVAL;
state->muted = ctrl->value;
tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
/* set gain on both channels to +3.0 dB */
if (!state->muted)
tlv320aic23b_write(sd, 0, 0x119);
return 0;
}
static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
{
struct tlv320aic23b_state *state = to_state(sd);
v4l2_info(sd, "Input: %s\n", state->muted ? "muted" : "active");
return 0;
}
/* ----------------------------------------------------------------------- */
static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
.log_status = tlv320aic23b_log_status,
.g_ctrl = tlv320aic23b_g_ctrl,
.s_ctrl = tlv320aic23b_s_ctrl,
};
static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
.s_clock_freq = tlv320aic23b_s_clock_freq,
};
static const struct v4l2_subdev_ops tlv320aic23b_ops = {
.core = &tlv320aic23b_core_ops,
.audio = &tlv320aic23b_audio_ops,
};
/* ----------------------------------------------------------------------- */
/* i2c implementation */
/*
* Generic i2c probe
* concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
*/
static int tlv320aic23b_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct tlv320aic23b_state *state;
struct v4l2_subdev *sd;
/* Check if the adapter supports the needed features */
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -EIO;
v4l_info(client, "chip found @ 0x%x (%s)\n",
client->addr << 1, client->adapter->name);
state = kzalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
if (state == NULL)
return -ENOMEM;
sd = &state->sd;
v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
state->muted = 0;
/* Initialize tlv320aic23b */
/* RESET */
tlv320aic23b_write(sd, 15, 0x000);
/* turn off DAC & mic input */
tlv320aic23b_write(sd, 6, 0x00A);
/* left-justified, 24-bit, master mode */
tlv320aic23b_write(sd, 7, 0x049);
/* set gain on both channels to +3.0 dB */
tlv320aic23b_write(sd, 0, 0x119);
/* set sample rate to 48 kHz */
tlv320aic23b_write(sd, 8, 0x000);
/* activate digital interface */
tlv320aic23b_write(sd, 9, 0x001);
return 0;
}
static int tlv320aic23b_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
v4l2_device_unregister_subdev(sd);
kfree(to_state(sd));
return 0;
}
/* ----------------------------------------------------------------------- */
static const struct i2c_device_id tlv320aic23b_id[] = {
{ "tlv320aic23b", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
static struct i2c_driver tlv320aic23b_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "tlv320aic23b",
},
.probe = tlv320aic23b_probe,
.remove = tlv320aic23b_remove,
.id_table = tlv320aic23b_id,
};
static __init int init_tlv320aic23b(void)
{
return i2c_add_driver(&tlv320aic23b_driver);
}
static __exit void exit_tlv320aic23b(void)
{
i2c_del_driver(&tlv320aic23b_driver);
}
module_init(init_tlv320aic23b);
module_exit(exit_tlv320aic23b);
