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abd4627475
Based on the normalized pattern:
this program is free software you can redistribute it and/or modify it
under the terms of the gnu general public license version 2 as
published by the free software foundation this program is distributed
as is without any warranty of any kind whether expressed or implied
without even the implied warranty of merchantability or fitness for a
particular purpose see the gnu general public license version 2 for
more details
extracted by the scancode license scanner the SPDX license identifier
GPL-2.0-only
has been chosen to replace the boilerplate/reference.
Reviewed-by: Allison Randal <allison@lohutok.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
157 lines
3.5 KiB
C
157 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
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* Andrew F. Davis <afd@ti.com>
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*/
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#include <linux/gpio/driver.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#define TPIC2810_WS_COMMAND 0x44
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/**
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* struct tpic2810 - GPIO driver data
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* @chip: GPIO controller chip
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* @client: I2C device pointer
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* @buffer: Buffer for device register
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* @lock: Protects write sequences
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*/
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struct tpic2810 {
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struct gpio_chip chip;
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struct i2c_client *client;
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u8 buffer;
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struct mutex lock;
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};
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static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value);
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static int tpic2810_get_direction(struct gpio_chip *chip,
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unsigned offset)
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{
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/* This device always output */
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return GPIO_LINE_DIRECTION_OUT;
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}
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static int tpic2810_direction_input(struct gpio_chip *chip,
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unsigned offset)
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{
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/* This device is output only */
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return -EINVAL;
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}
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static int tpic2810_direction_output(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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/* This device always output */
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tpic2810_set(chip, offset, value);
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return 0;
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}
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static void tpic2810_set_mask_bits(struct gpio_chip *chip, u8 mask, u8 bits)
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{
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struct tpic2810 *gpio = gpiochip_get_data(chip);
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u8 buffer;
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int err;
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mutex_lock(&gpio->lock);
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buffer = gpio->buffer & ~mask;
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buffer |= (mask & bits);
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err = i2c_smbus_write_byte_data(gpio->client, TPIC2810_WS_COMMAND,
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buffer);
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if (!err)
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gpio->buffer = buffer;
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mutex_unlock(&gpio->lock);
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}
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static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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tpic2810_set_mask_bits(chip, BIT(offset), value ? BIT(offset) : 0);
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}
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static void tpic2810_set_multiple(struct gpio_chip *chip, unsigned long *mask,
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unsigned long *bits)
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{
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tpic2810_set_mask_bits(chip, *mask, *bits);
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}
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static const struct gpio_chip template_chip = {
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.label = "tpic2810",
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.owner = THIS_MODULE,
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.get_direction = tpic2810_get_direction,
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.direction_input = tpic2810_direction_input,
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.direction_output = tpic2810_direction_output,
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.set = tpic2810_set,
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.set_multiple = tpic2810_set_multiple,
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.base = -1,
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.ngpio = 8,
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.can_sleep = true,
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};
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static const struct of_device_id tpic2810_of_match_table[] = {
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{ .compatible = "ti,tpic2810" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, tpic2810_of_match_table);
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static int tpic2810_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct tpic2810 *gpio;
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int ret;
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gpio = devm_kzalloc(&client->dev, sizeof(*gpio), GFP_KERNEL);
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if (!gpio)
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return -ENOMEM;
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i2c_set_clientdata(client, gpio);
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gpio->chip = template_chip;
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gpio->chip.parent = &client->dev;
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gpio->client = client;
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mutex_init(&gpio->lock);
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ret = gpiochip_add_data(&gpio->chip, gpio);
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if (ret < 0) {
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dev_err(&client->dev, "Unable to register gpiochip\n");
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return ret;
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}
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return 0;
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}
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static int tpic2810_remove(struct i2c_client *client)
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{
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struct tpic2810 *gpio = i2c_get_clientdata(client);
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gpiochip_remove(&gpio->chip);
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return 0;
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}
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static const struct i2c_device_id tpic2810_id_table[] = {
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{ "tpic2810", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(i2c, tpic2810_id_table);
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static struct i2c_driver tpic2810_driver = {
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.driver = {
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.name = "tpic2810",
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.of_match_table = tpic2810_of_match_table,
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},
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.probe = tpic2810_probe,
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.remove = tpic2810_remove,
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.id_table = tpic2810_id_table,
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};
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module_i2c_driver(tpic2810_driver);
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MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
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MODULE_DESCRIPTION("TPIC2810 8-Bit LED Driver GPIO Driver");
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MODULE_LICENSE("GPL v2");
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