232 lines
6.2 KiB
C
232 lines
6.2 KiB
C
/*
|
|
* 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/v4l2-common.h>
|
|
#include <media/v4l2-chip-ident.h>
|
|
#include <media/v4l2-i2c-drv-legacy.h>
|
|
|
|
MODULE_DESCRIPTION("wm8775 driver");
|
|
MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
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) {
|
|
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 wm8775_command(struct i2c_client *client, unsigned cmd, void *arg)
|
|
{
|
|
struct wm8775_state *state = i2c_get_clientdata(client);
|
|
struct v4l2_routing *route = arg;
|
|
struct v4l2_control *ctrl = arg;
|
|
|
|
switch (cmd) {
|
|
case VIDIOC_INT_G_AUDIO_ROUTING:
|
|
route->input = state->input;
|
|
route->output = 0;
|
|
break;
|
|
|
|
case VIDIOC_INT_S_AUDIO_ROUTING:
|
|
/* There are 4 inputs and one output. Zero or more inputs
|
|
are multiplexed together to the output. Hence there are
|
|
16 combinations.
|
|
If only one input is active (the normal case) then the
|
|
input values 1, 2, 4 or 8 should be used. */
|
|
if (route->input > 15) {
|
|
v4l_err(client, "Invalid input %d.\n", route->input);
|
|
return -EINVAL;
|
|
}
|
|
state->input = route->input;
|
|
if (state->muted)
|
|
break;
|
|
wm8775_write(client, R21, 0x0c0);
|
|
wm8775_write(client, R14, 0x1d4);
|
|
wm8775_write(client, R15, 0x1d4);
|
|
wm8775_write(client, R21, 0x100 + state->input);
|
|
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;
|
|
wm8775_write(client, R21, 0x0c0);
|
|
wm8775_write(client, R14, 0x1d4);
|
|
wm8775_write(client, R15, 0x1d4);
|
|
if (!state->muted)
|
|
wm8775_write(client, R21, 0x100 + state->input);
|
|
break;
|
|
|
|
case VIDIOC_G_CHIP_IDENT:
|
|
return v4l2_chip_ident_i2c_client(client,
|
|
arg, V4L2_IDENT_WM8775, 0);
|
|
|
|
case VIDIOC_LOG_STATUS:
|
|
v4l_info(client, "Input: %d%s\n", state->input,
|
|
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 int wm8775_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct wm8775_state *state;
|
|
|
|
/* 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 = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
|
|
if (state == NULL)
|
|
return -ENOMEM;
|
|
state->input = 2;
|
|
state->muted = 0;
|
|
i2c_set_clientdata(client, state);
|
|
|
|
/* Initialize wm8775 */
|
|
|
|
/* RESET */
|
|
wm8775_write(client, R23, 0x000);
|
|
/* Disable zero cross detect timeout */
|
|
wm8775_write(client, R7, 0x000);
|
|
/* Left justified, 24-bit mode */
|
|
wm8775_write(client, R11, 0x021);
|
|
/* Master mode, clock ratio 256fs */
|
|
wm8775_write(client, R12, 0x102);
|
|
/* Powered up */
|
|
wm8775_write(client, R13, 0x000);
|
|
/* ADC gain +2.5dB, enable zero cross */
|
|
wm8775_write(client, R14, 0x1d4);
|
|
/* ADC gain +2.5dB, enable zero cross */
|
|
wm8775_write(client, R15, 0x1d4);
|
|
/* ALC Stereo, ALC target level -1dB FS max gain +8dB */
|
|
wm8775_write(client, R16, 0x1bf);
|
|
/* Enable gain control, use zero cross detection,
|
|
ALC hold time 42.6 ms */
|
|
wm8775_write(client, R17, 0x185);
|
|
/* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */
|
|
wm8775_write(client, R18, 0x0a2);
|
|
/* Enable noise gate, threshold -72dBfs */
|
|
wm8775_write(client, R19, 0x005);
|
|
/* Transient window 4ms, lower PGA gain limit -1dB */
|
|
wm8775_write(client, R20, 0x07a);
|
|
/* LRBOTH = 1, use input 2. */
|
|
wm8775_write(client, R21, 0x102);
|
|
return 0;
|
|
}
|
|
|
|
static int wm8775_remove(struct i2c_client *client)
|
|
{
|
|
kfree(i2c_get_clientdata(client));
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id wm8775_id[] = {
|
|
{ "wm8775", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, wm8775_id);
|
|
|
|
static struct v4l2_i2c_driver_data v4l2_i2c_data = {
|
|
.name = "wm8775",
|
|
.driverid = I2C_DRIVERID_WM8775,
|
|
.command = wm8775_command,
|
|
.probe = wm8775_probe,
|
|
.remove = wm8775_remove,
|
|
.id_table = wm8775_id,
|
|
};
|