/*
* wm8739
*
* Copyright (C) 2005 T. Adachi <tadachi@tadachi-net.com>
*
* Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
* - Cleanup
*
* 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/videodev2.h>
#include <media/v4l2-common.h>
#include <media/v4l2-chip-ident.h>
#include <media/v4l2-i2c-drv.h>
MODULE_DESCRIPTION("wm8739 driver");
MODULE_AUTHOR("T. Adachi, Hans Verkuil");
MODULE_LICENSE("GPL");
static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Debug level (0-1)");
/* ------------------------------------------------------------------------ */
enum {
R0 = 0, R1,
R5 = 5, R6, R7, R8, R9, R15 = 15,
TOT_REGS
};
struct wm8739_state {
u32 clock_freq;
u8 muted;
u16 volume;
u16 balance;
u8 vol_l; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
u8 vol_r; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
};
/* ------------------------------------------------------------------------ */
static int wm8739_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;
}
v4l_dbg(1, debug, client, "write: %02x %02x\n", reg, val);
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;
}
/* write regs to set audio volume etc */
static void wm8739_set_audio(struct i2c_client *client)
{
struct wm8739_state *state = i2c_get_clientdata(client);
u16 mute = state->muted ? 0x80 : 0;
/* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
* Default setting: 0x17 = 0 dB
*/
wm8739_write(client, R0, (state->vol_l & 0x1f) | mute);
wm8739_write(client, R1, (state->vol_r & 0x1f) | mute);
}
static int wm8739_get_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
{
struct wm8739_state *state = i2c_get_clientdata(client);
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
ctrl->value = state->muted;
break;
case V4L2_CID_AUDIO_VOLUME:
ctrl->value = state->volume;
break;
case V4L2_CID_AUDIO_BALANCE:
ctrl->value = state->balance;
break;
default:
return -EINVAL;
}
return 0;
}
static int wm8739_set_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
{
struct wm8739_state *state = i2c_get_clientdata(client);
unsigned int work_l, work_r;
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
state->muted = ctrl->value;
break;
case V4L2_CID_AUDIO_VOLUME:
state->volume = ctrl->value;
break;
case V4L2_CID_AUDIO_BALANCE:
state->balance = ctrl->value;
break;
default:
return -EINVAL;
}
/* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
work_l = (min(65536 - state->balance, 32768) * state->volume) / 32768;
work_r = (min(state->balance, (u16)32768) * state->volume) / 32768;
state->vol_l = (long)work_l * 31 / 65535;
state->vol_r = (long)work_r * 31 / 65535;
/* set audio volume etc. */
wm8739_set_audio(client);
return 0;
}
/* ------------------------------------------------------------------------ */
static struct v4l2_queryctrl wm8739_qctrl[] = {
{
.id = V4L2_CID_AUDIO_VOLUME,
.name = "Volume",
.minimum = 0,
.maximum = 65535,
.step = 65535/100,
.default_value = 58880,
.flags = 0,
.type = V4L2_CTRL_TYPE_INTEGER,
}, {
.id = V4L2_CID_AUDIO_MUTE,
.name = "Mute",
.minimum = 0,
.maximum = 1,
.step = 1,
.default_value = 1,
.flags = 0,
.type = V4L2_CTRL_TYPE_BOOLEAN,
}, {
.id = V4L2_CID_AUDIO_BALANCE,
.name = "Balance",
.minimum = 0,
.maximum = 65535,
.step = 65535/100,
.default_value = 32768,
.flags = 0,
.type = V4L2_CTRL_TYPE_INTEGER,
}
};
/* ------------------------------------------------------------------------ */
static int wm8739_command(struct i2c_client *client, unsigned cmd, void *arg)
{
struct wm8739_state *state = i2c_get_clientdata(client);
switch (cmd) {
case VIDIOC_INT_AUDIO_CLOCK_FREQ:
{
u32 audiofreq = *(u32 *)arg;
state->clock_freq = audiofreq;
/* de-activate */
wm8739_write(client, R9, 0x000);
switch (audiofreq) {
case 44100:
/* 256fps, fs=44.1k */
wm8739_write(client, R8, 0x020);
break;
case 48000:
/* 256fps, fs=48k */
wm8739_write(client, R8, 0x000);
break;
case 32000:
/* 256fps, fs=32k */
wm8739_write(client, R8, 0x018);
break;
default:
break;
}
/* activate */
wm8739_write(client, R9, 0x001);
break;
}
case VIDIOC_G_CTRL:
return wm8739_get_ctrl(client, arg);
case VIDIOC_S_CTRL:
return wm8739_set_ctrl(client, arg);
case VIDIOC_QUERYCTRL:
{
struct v4l2_queryctrl *qc = arg;
int i;
for (i = 0; i < ARRAY_SIZE(wm8739_qctrl); i++)
if (qc->id && qc->id == wm8739_qctrl[i].id) {
memcpy(qc, &wm8739_qctrl[i], sizeof(*qc));
return 0;
}
return -EINVAL;
}
case VIDIOC_G_CHIP_IDENT:
return v4l2_chip_ident_i2c_client(client,
arg, V4L2_IDENT_WM8739, 0);
case VIDIOC_LOG_STATUS:
v4l_info(client, "Frequency: %u Hz\n", state->clock_freq);
v4l_info(client, "Volume L: %02x%s\n", state->vol_l & 0x1f,
state->muted ? " (muted)" : "");
v4l_info(client, "Volume R: %02x%s\n", state->vol_r & 0x1f,
state->muted ? " (muted)" : "");
break;
default:
return -EINVAL;
}
return 0;
}
/* ------------------------------------------------------------------------ */
/* i2c implementation */
static int wm8739_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct wm8739_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 wm8739_state), GFP_KERNEL);
if (state == NULL)
return -ENOMEM;
state->vol_l = 0x17; /* 0dB */
state->vol_r = 0x17; /* 0dB */
state->muted = 0;
state->balance = 32768;
/* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */
state->volume = ((long)state->vol_l + 1) * 65535 / 31;
state->clock_freq = 48000;
i2c_set_clientdata(client, state);
/* Initialize wm8739 */
/* reset */
wm8739_write(client, R15, 0x00);
/* filter setting, high path, offet clear */
wm8739_write(client, R5, 0x000);
/* ADC, OSC, Power Off mode Disable */
wm8739_write(client, R6, 0x000);
/* Digital Audio interface format:
Enable Master mode, 24 bit, MSB first/left justified */
wm8739_write(client, R7, 0x049);
/* sampling control: normal, 256fs, 48KHz sampling rate */
wm8739_write(client, R8, 0x000);
/* activate */
wm8739_write(client, R9, 0x001);
/* set volume/mute */
wm8739_set_audio(client);
return 0;
}
static int wm8739_remove(struct i2c_client *client)
{
kfree(i2c_get_clientdata(client));
return 0;
}
static const struct i2c_device_id wm8739_id[] = {
{ "wm8739", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, wm8739_id);
static struct v4l2_i2c_driver_data v4l2_i2c_data = {
.name = "wm8739",
.driverid = I2C_DRIVERID_WM8739,
.command = wm8739_command,
.probe = wm8739_probe,
.remove = wm8739_remove,
.id_table = wm8739_id,
};
