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128 lines
3.3 KiB
128 lines
3.3 KiB
// 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 <[email protected]> |
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* Copyright (C) 2012 Steven Toth <[email protected]> |
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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 int 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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return 0; |
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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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