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