c942fddf87
Based on 3 normalized pattern(s): 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 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 [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] 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 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 [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
129 lines
3.3 KiB
C
129 lines
3.3 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 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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