127 lines
3.2 KiB
C
127 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Cirrus Logic cs3308 8-Channel Analog Volume Control
|
|
*
|
|
* Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com>
|
|
* Copyright (C) 2012 Steven Toth <stoth@kernellabs.com>
|
|
*
|
|
* Derived from cs5345.c Copyright (C) 2007 Hans Verkuil
|
|
*/
|
|
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/videodev2.h>
|
|
#include <media/v4l2-device.h>
|
|
|
|
MODULE_DESCRIPTION("i2c device driver for cs3308 8-channel volume control");
|
|
MODULE_AUTHOR("Devin Heitmueller");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static inline int cs3308_write(struct v4l2_subdev *sd, u8 reg, u8 value)
|
|
{
|
|
struct i2c_client *client = v4l2_get_subdevdata(sd);
|
|
|
|
return i2c_smbus_write_byte_data(client, reg, value);
|
|
}
|
|
|
|
static inline int cs3308_read(struct v4l2_subdev *sd, u8 reg)
|
|
{
|
|
struct i2c_client *client = v4l2_get_subdevdata(sd);
|
|
|
|
return i2c_smbus_read_byte_data(client, reg);
|
|
}
|
|
|
|
#ifdef CONFIG_VIDEO_ADV_DEBUG
|
|
static int cs3308_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
|
|
{
|
|
reg->val = cs3308_read(sd, reg->reg & 0xffff);
|
|
reg->size = 1;
|
|
return 0;
|
|
}
|
|
|
|
static int cs3308_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
|
|
{
|
|
cs3308_write(sd, reg->reg & 0xffff, reg->val & 0xff);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
static const struct v4l2_subdev_core_ops cs3308_core_ops = {
|
|
#ifdef CONFIG_VIDEO_ADV_DEBUG
|
|
.g_register = cs3308_g_register,
|
|
.s_register = cs3308_s_register,
|
|
#endif
|
|
};
|
|
|
|
static const struct v4l2_subdev_ops cs3308_ops = {
|
|
.core = &cs3308_core_ops,
|
|
};
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
static int cs3308_probe(struct i2c_client *client)
|
|
{
|
|
struct v4l2_subdev *sd;
|
|
unsigned i;
|
|
|
|
/* Check if the adapter supports the needed features */
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
|
|
return -EIO;
|
|
|
|
if ((i2c_smbus_read_byte_data(client, 0x1c) & 0xf0) != 0xe0)
|
|
return -ENODEV;
|
|
|
|
v4l_info(client, "chip found @ 0x%x (%s)\n",
|
|
client->addr << 1, client->adapter->name);
|
|
|
|
sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
|
|
if (sd == NULL)
|
|
return -ENOMEM;
|
|
|
|
v4l2_i2c_subdev_init(sd, client, &cs3308_ops);
|
|
|
|
/* Set some reasonable defaults */
|
|
cs3308_write(sd, 0x0d, 0x00); /* Power up all channels */
|
|
cs3308_write(sd, 0x0e, 0x00); /* Master Power */
|
|
cs3308_write(sd, 0x0b, 0x00); /* Device Configuration */
|
|
/* Set volume for each channel */
|
|
for (i = 1; i <= 8; i++)
|
|
cs3308_write(sd, i, 0xd2);
|
|
cs3308_write(sd, 0x0a, 0x00); /* Unmute all channels */
|
|
return 0;
|
|
}
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
static void cs3308_remove(struct i2c_client *client)
|
|
{
|
|
struct v4l2_subdev *sd = i2c_get_clientdata(client);
|
|
|
|
v4l2_device_unregister_subdev(sd);
|
|
kfree(sd);
|
|
}
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
static const struct i2c_device_id cs3308_id[] = {
|
|
{ "cs3308", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, cs3308_id);
|
|
|
|
static struct i2c_driver cs3308_driver = {
|
|
.driver = {
|
|
.name = "cs3308",
|
|
},
|
|
.probe_new = cs3308_probe,
|
|
.remove = cs3308_remove,
|
|
.id_table = cs3308_id,
|
|
};
|
|
|
|
module_i2c_driver(cs3308_driver);
|