// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/ioctl.h>
#include <linux/uaccess.h>
#include <linux/i2c.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>
#include <media/i2c/wm8775.h>
MODULE_DESCRIPTION("wm8775 driver" );
MODULE_AUTHOR("Ulf Eklund, Hans Verkuil" );
MODULE_LICENSE("GPL" );
/* ----------------------------------------------------------------------- */
enum {
R7 = 7 , R11 = 11 ,
R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23 ,
TOT_REGS
};
#define ALC_HOLD 0 x85 /* R17: use zero cross detection, ALC hold time 42.6 ms */
#define ALC_EN 0 x100 /* R17: ALC enable */
struct wm8775_state {
struct v4l2_subdev sd;
struct v4l2_ctrl_handler hdl;
struct v4l2_ctrl *mute;
struct v4l2_ctrl *vol;
struct v4l2_ctrl *bal;
struct v4l2_ctrl *loud;
u8 input; /* Last selected input (0-0xf) */
};
static inline struct wm8775_state *to_state(struct v4l2_subdev *sd)
{
return container_of(sd, struct wm8775_state, sd);
}
static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
{
return &container_of(ctrl->handler, struct wm8775_state, hdl)->sd;
}
static int wm8775_write(struct v4l2_subdev *sd, int reg, u16 val)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
int i;
if (reg < 0 || reg >= TOT_REGS) {
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 & 0 xff) == 0 )
return 0 ;
v4l2_err(sd, "I2C: cannot write %03x to register R%d\n" , val, reg);
return -1 ;
}
static void wm8775_set_audio(struct v4l2_subdev *sd, int quietly)
{
struct wm8775_state *state = to_state(sd);
u8 vol_l, vol_r;
int muted = 0 != state->mute->val;
u16 volume = (u16)state->vol->val;
u16 balance = (u16)state->bal->val;
/* normalize ( 65535 to 0 -> 255 to 0 (+24dB to -103dB) ) */
vol_l = (min(65536 - balance, 32768 ) * volume) >> 23 ;
vol_r = (min(balance, (u16)32768 ) * volume) >> 23 ;
/* Mute */
if (muted || quietly)
wm8775_write(sd, R21, 0 x0c0 | state->input);
wm8775_write(sd, R14, vol_l | 0 x100); /* 0x100= Left channel ADC zero cross enable */
wm8775_write(sd, R15, vol_r | 0 x100); /* 0x100= Right channel ADC zero cross enable */
/* Un-mute */
if (!muted)
wm8775_write(sd, R21, state->input);
}
static int wm8775_s_routing(struct v4l2_subdev *sd,
u32 input, u32 output, u32 config)
{
struct wm8775_state *state = to_state(sd);
/* 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 (input > 15 ) {
v4l2_err(sd, "Invalid input %d.\n" , input);
return -EINVAL;
}
state->input = input;
if (v4l2_ctrl_g_ctrl(state->mute))
return 0 ;
if (!v4l2_ctrl_g_ctrl(state->vol))
return 0 ;
wm8775_set_audio(sd, 1 );
return 0 ;
}
static int wm8775_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct v4l2_subdev *sd = to_sd(ctrl);
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
case V4L2_CID_AUDIO_VOLUME:
case V4L2_CID_AUDIO_BALANCE:
wm8775_set_audio(sd, 0 );
return 0 ;
case V4L2_CID_AUDIO_LOUDNESS:
wm8775_write(sd, R17, (ctrl->val ? ALC_EN : 0 ) | ALC_HOLD);
return 0 ;
}
return -EINVAL;
}
static int wm8775_log_status(struct v4l2_subdev *sd)
{
struct wm8775_state *state = to_state(sd);
v4l2_info(sd, "Input: %d\n" , state->input);
v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
return 0 ;
}
static int wm8775_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *freq)
{
wm8775_set_audio(sd, 0 );
return 0 ;
}
/* ----------------------------------------------------------------------- */
static const struct v4l2_ctrl_ops wm8775_ctrl_ops = {
.s_ctrl = wm8775_s_ctrl,
};
static const struct v4l2_subdev_core_ops wm8775_core_ops = {
.log_status = wm8775_log_status,
};
static const struct v4l2_subdev_tuner_ops wm8775_tuner_ops = {
.s_frequency = wm8775_s_frequency,
};
static const struct v4l2_subdev_audio_ops wm8775_audio_ops = {
.s_routing = wm8775_s_routing,
};
static const struct v4l2_subdev_ops wm8775_ops = {
.core = &wm8775_core_ops,
.tuner = &wm8775_tuner_ops,
.audio = &wm8775_audio_ops,
};
/* ----------------------------------------------------------------------- */
/* 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)
{
struct wm8775_state *state;
struct v4l2_subdev *sd;
int err;
bool is_nova_s = false ;
if (client->dev.platform_data) {
struct wm8775_platform_data *data = client->dev.platform_data;
is_nova_s = data->is_nova_s;
}
/* 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%02x (%s)\n" ,
client->addr << 1 , client->adapter->name);
state = devm_kzalloc(&client->dev, sizeof (*state), GFP_KERNEL);
if (state == NULL)
return -ENOMEM;
sd = &state->sd;
v4l2_i2c_subdev_init(sd, client, &wm8775_ops);
state->input = 2 ;
v4l2_ctrl_handler_init(&state->hdl, 4 );
state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
V4L2_CID_AUDIO_MUTE, 0 , 1 , 1 , 0 );
state->vol = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
V4L2_CID_AUDIO_VOLUME, 0 , 65535 , (65535 +99 )/100 , 0 xCF00); /* 0dB*/
state->bal = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
V4L2_CID_AUDIO_BALANCE, 0 , 65535 , (65535 +99 )/100 , 32768 );
state->loud = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
V4L2_CID_AUDIO_LOUDNESS, 0 , 1 , 1 , 1 );
sd->ctrl_handler = &state->hdl;
err = state->hdl.error;
if (err) {
v4l2_ctrl_handler_free(&state->hdl);
return err;
}
/* Initialize wm8775 */
/* RESET */
wm8775_write(sd, R23, 0 x000);
/* Disable zero cross detect timeout */
wm8775_write(sd, R7, 0 x000);
/* HPF enable, left justified, 24-bit (Philips) mode */
wm8775_write(sd, R11, 0 x021);
/* Master mode, clock ratio 256fs */
wm8775_write(sd, R12, 0 x102);
/* Powered up */
wm8775_write(sd, R13, 0 x000);
if (!is_nova_s) {
/* ADC gain +2.5dB, enable zero cross */
wm8775_write(sd, R14, 0 x1d4);
/* ADC gain +2.5dB, enable zero cross */
wm8775_write(sd, R15, 0 x1d4);
/* ALC Stereo, ALC target level -1dB FS max gain +8dB */
wm8775_write(sd, R16, 0 x1bf);
/* Enable gain control, use zero cross detection,
ALC hold time 42.6 ms */
wm8775_write(sd, R17, 0 x185);
} else {
/* ALC stereo, ALC target level -5dB FS, ALC max gain +8dB */
wm8775_write(sd, R16, 0 x1bb);
/* Set ALC mode and hold time */
wm8775_write(sd, R17, (state->loud->val ? ALC_EN : 0 ) | ALC_HOLD);
}
/* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */
wm8775_write(sd, R18, 0 x0a2);
/* Enable noise gate, threshold -72dBfs */
wm8775_write(sd, R19, 0 x005);
if (!is_nova_s) {
/* Transient window 4ms, lower PGA gain limit -1dB */
wm8775_write(sd, R20, 0 x07a);
/* LRBOTH = 1, use input 2. */
wm8775_write(sd, R21, 0 x102);
} else {
/* Transient window 4ms, ALC min gain -5dB */
wm8775_write(sd, R20, 0 x0fb);
wm8775_set_audio(sd, 1 ); /* set volume/mute/mux */
}
return 0 ;
}
static void wm8775_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
struct wm8775_state *state = to_state(sd);
v4l2_device_unregister_subdev(sd);
v4l2_ctrl_handler_free(&state->hdl);
}
static const struct i2c_device_id wm8775_id[] = {
{ "wm8775" },
{ }
};
MODULE_DEVICE_TABLE(i2c, wm8775_id);
static struct i2c_driver wm8775_driver = {
.driver = {
.name = "wm8775" ,
},
.probe = wm8775_probe,
.remove = wm8775_remove,
.id_table = wm8775_id,
};
module_i2c_driver(wm8775_driver);
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