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/*
* wm8775 - driver version 0.0.1
*
* Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
*
* Based on saa7115 driver
*
* Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
* - Cleanup
* - V4L2 API update
* - sound fixes
*
* 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/audiochip.h>
MODULE_DESCRIPTION("wm8775 driver");
MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
MODULE_LICENSE("GPL");
#define wm8775_err(fmt, arg...) do { \
printk(KERN_ERR "%s %d-%04x: " fmt, client->driver->driver.name, \
i2c_adapter_id(client->adapter), client->addr , ## arg); } while (0)
#define wm8775_info(fmt, arg...) do { \
printk(KERN_INFO "%s %d-%04x: " fmt, client->driver->driver.name, \
i2c_adapter_id(client->adapter), client->addr , ## arg); } while (0)
static unsigned short normal_i2c[] = { 0x36 >> 1, I2C_CLIENT_END };
I2C_CLIENT_INSMOD;
/* ----------------------------------------------------------------------- */
enum {
R7 = 7, R11 = 11,
R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
TOT_REGS
};
struct wm8775_state {
u8 input; /* Last selected input (0-0xf) */
u8 muted;
};
static int wm8775_write(struct i2c_client *client, int reg, u16 val)
{
int i;
if (reg < 0 || reg >= TOT_REGS) {
wm8775_err("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;
}
}
wm8775_err("I2C: cannot write %03x to register R%d\n", val, reg);
return -1;
}
static int wm8775_command(struct i2c_client *client, unsigned int cmd,
void *arg)
{
struct wm8775_state *state = i2c_get_clientdata(client);
int *input = arg;
switch (cmd) {
case AUDC_SET_INPUT:
wm8775_write(client, R21, 0x0c0);
wm8775_write(client, R14, 0x1d4);
wm8775_write(client, R15, 0x1d4);
if (*input == AUDIO_RADIO) {
wm8775_write(client, R21, 0x108);
state->input = 8;
state->muted = 0;
break;
}
if (*input == AUDIO_MUTE) {
state->muted = 1;
break;
}
if (*input == AUDIO_UNMUTE) {
wm8775_write(client, R21, 0x100 + state->input);
state->muted = 0;
break;
}
/* All other inputs... */
wm8775_write(client, R21, 0x102);
state->input = 2;
state->muted = 0;
break;
case VIDIOC_LOG_STATUS:
wm8775_info("Input: %s%s\n",
state->input == 8 ? "radio" : "default",
state->muted ? " (muted)" : "");
break;
case VIDIOC_S_FREQUENCY:
/* If I remove this, then it can happen that I have no
sound the first time I tune from static to a valid channel.
It's difficult to reproduce and is almost certainly related
to the zero cross detect circuit. */
wm8775_write(client, R21, 0x0c0);
wm8775_write(client, R14, 0x1d4);
wm8775_write(client, R15, 0x1d4);
wm8775_write(client, R21, 0x100 + state->input);
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 wm8775_attach(struct i2c_adapter *adapter, int address, int kind)
{
struct i2c_client *client;
struct wm8775_state *state;
/* Check if the adapter supports the needed features */
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return 0;
client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
if (client == 0)
return -ENOMEM;
memset(client, 0, sizeof(struct i2c_client));
client->addr = address;
client->adapter = adapter;
client->driver = &i2c_driver;
snprintf(client->name, sizeof(client->name) - 1, "wm8775");
wm8775_info("chip found @ 0x%x (%s)\n", address << 1, adapter->name);
state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
if (state == NULL) {
kfree(client);
return -ENOMEM;
}
state->input = 2;
state->muted = 0;
i2c_set_clientdata(client, state);
/* initialize wm8775 */
wm8775_write(client, R23, 0x000); /* RESET */
wm8775_write(client, R7, 0x000); /* Disable zero cross detect timeout */
wm8775_write(client, R11, 0x021); /* Left justified, 24-bit mode */
wm8775_write(client, R12, 0x102); /* Master mode, clock ratio 256fs */
wm8775_write(client, R13, 0x000); /* Powered up */
wm8775_write(client, R14, 0x1d4); /* ADC gain +2.5dB, enable zero cross */
wm8775_write(client, R15, 0x1d4); /* ADC gain +2.5dB, enable zero cross */
wm8775_write(client, R16, 0x1bf); /* ALC Stereo, ALC target level -1dB FS */
/* max gain +8dB */
wm8775_write(client, R17, 0x185); /* Enable gain control, use zero cross */
/* detection, ALC hold time 42.6 ms */
wm8775_write(client, R18, 0x0a2); /* ALC gain ramp up delay 34 s, */
/* ALC gain ramp down delay 33 ms */
wm8775_write(client, R19, 0x005); /* Enable noise gate, threshold -72dBfs */
wm8775_write(client, R20, 0x07a); /* Transient window 4ms, lower PGA gain */
/* limit -1dB */
wm8775_write(client, R21, 0x102); /* LRBOTH = 1, use input 2. */
i2c_attach_client(client);
return 0;
}
static int wm8775_probe(struct i2c_adapter *adapter)
{
if (adapter->class & I2C_CLASS_TV_ANALOG)
return i2c_probe(adapter, &addr_data, wm8775_attach);
return 0;
}
static int wm8775_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 = "wm8775",
},
.id = I2C_DRIVERID_WM8775,
.attach_adapter = wm8775_probe,
.detach_client = wm8775_detach,
.command = wm8775_command,
};
static int __init wm8775_init_module(void)
{
return i2c_add_driver(&i2c_driver);
}
static void __exit wm8775_cleanup_module(void)
{
i2c_del_driver(&i2c_driver);
}
module_init(wm8775_init_module);
module_exit(wm8775_cleanup_module);
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