/*
* 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/ioctl.h>
#include <asm/uaccess.h>
#include <linux/i2c.h>
#include <linux/i2c-id.h>
#include <linux/videodev.h>
#include <media/v4l2-common.h>
MODULE_DESCRIPTION("tlv320aic23b driver");
MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
MODULE_LICENSE("GPL");
static unsigned short normal_i2c[] = { 0x34 >> 1, I2C_CLIENT_END };
I2C_CLIENT_INSMOD;
/* ----------------------------------------------------------------------- */
struct tlv320aic23b_state {
u8 muted;
};
static int tlv320aic23b_write(struct i2c_client *client, int reg, u16 val)
{
int i;
if ((reg < 0 || reg > 9) && (reg != 15)) {
v4l_err(client, "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;
}
}
v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
return -1;
}
static int tlv320aic23b_command(struct i2c_client *client, unsigned int cmd,
void *arg)
{
struct tlv320aic23b_state *state = i2c_get_clientdata(client);
struct v4l2_control *ctrl = arg;
u32* freq = arg;
switch (cmd) {
case VIDIOC_INT_AUDIO_CLOCK_FREQ:
switch (*freq) {
case 32000: /* set sample rate to 32 kHz */
tlv320aic23b_write(client, 8, 0x018);
break;
case 44100: /* set sample rate to 44.1 kHz */
tlv320aic23b_write(client, 8, 0x022);
break;
case 48000: /* set sample rate to 48 kHz */
tlv320aic23b_write(client, 8, 0x000);
break;
default:
return -EINVAL;
}
break;
case VIDIOC_G_CTRL:
if (ctrl->id != V4L2_CID_AUDIO_MUTE)
return -EINVAL;
ctrl->value = state->muted;
break;
case VIDIOC_S_CTRL:
if (ctrl->id != V4L2_CID_AUDIO_MUTE)
return -EINVAL;
state->muted = ctrl->value;
tlv320aic23b_write(client, 0, 0x180); /* mute both channels */
/* set gain on both channels to +3.0 dB */
if (!state->muted)
tlv320aic23b_write(client, 0, 0x119);
break;
case VIDIOC_LOG_STATUS:
v4l_info(client, "Input: %s\n",
state->muted ? "muted" : "active");
break;
default:
return -EINVAL;
}
return 0;
}
/* ----------------------------------------------------------------------- */
/* i2c implementation */
/*
* Generic i2c probe
* concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
*/
static struct i2c_driver i2c_driver;
static int tlv320aic23b_attach(struct i2c_adapter *adapter, int address, int kind)
{
struct i2c_client *client;
struct tlv320aic23b_state *state;
/* Check if the adapter supports the needed features */
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return 0;
client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
if (client == 0)
return -ENOMEM;
client->addr = address;
client->adapter = adapter;
client->driver = &i2c_driver;
snprintf(client->name, sizeof(client->name) - 1, "tlv320aic23b");
v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
state = kmalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
if (state == NULL) {
kfree(client);
return -ENOMEM;
}
state->muted = 0;
i2c_set_clientdata(client, state);
/* initialize tlv320aic23b */
tlv320aic23b_write(client, 15, 0x000); /* RESET */
tlv320aic23b_write(client, 6, 0x00A); /* turn off DAC & mic input */
tlv320aic23b_write(client, 7, 0x049); /* left-justified, 24-bit, master mode */
tlv320aic23b_write(client, 0, 0x119); /* set gain on both channels to +3.0 dB */
tlv320aic23b_write(client, 8, 0x000); /* set sample rate to 48 kHz */
tlv320aic23b_write(client, 9, 0x001); /* activate digital interface */
i2c_attach_client(client);
return 0;
}
static int tlv320aic23b_probe(struct i2c_adapter *adapter)
{
if (adapter->class & I2C_CLASS_TV_ANALOG)
return i2c_probe(adapter, &addr_data, tlv320aic23b_attach);
return 0;
}
static int tlv320aic23b_detach(struct i2c_client *client)
{
int err;
err = i2c_detach_client(client);
if (err) {
return err;
}
kfree(client);
return 0;
}
/* ----------------------------------------------------------------------- */
/* i2c implementation */
static struct i2c_driver i2c_driver = {
.driver = {
.name = "tlv320aic23b",
},
.id = I2C_DRIVERID_TLV320AIC23B,
.attach_adapter = tlv320aic23b_probe,
.detach_client = tlv320aic23b_detach,
.command = tlv320aic23b_command,
};
static int __init tlv320aic23b_init_module(void)
{
return i2c_add_driver(&i2c_driver);
}
static void __exit tlv320aic23b_cleanup_module(void)
{
i2c_del_driver(&i2c_driver);
}
module_init(tlv320aic23b_init_module);
module_exit(tlv320aic23b_cleanup_module);
