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b41cabb7be
After commitb8a1a4cd5a("i2c: Provide a temporary .probe_new() call-back type"), all drivers being converted to .probe_new() and then03c835f498("i2c: Switch .probe() to not take an id parameter") convert back to (the new) .probe() to be able to eventually drop .probe_new() from struct i2c_driver. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
138 lines
3.1 KiB
C
138 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2015-2023 Texas Instruments Incorporated - https://www.ti.com/
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* Andrew 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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{
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struct tpic2810 *gpio;
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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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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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return devm_gpiochip_add_data(&client->dev, &gpio->chip, gpio);
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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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.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 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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