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![Thomas Gleixner](/assets/img/avatar_default.png)
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>
187 lines
4.3 KiB
C
187 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
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* Keerthy <j-keerthy@ti.com>
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*
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* Based on the LP873X driver
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*/
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#include <linux/gpio/driver.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/mfd/lp87565.h>
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struct lp87565_gpio {
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struct gpio_chip chip;
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struct regmap *map;
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};
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static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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struct lp87565_gpio *gpio = gpiochip_get_data(chip);
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int ret, val;
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ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
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if (ret < 0)
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return ret;
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return !!(val & BIT(offset));
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}
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static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
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int value)
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{
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struct lp87565_gpio *gpio = gpiochip_get_data(chip);
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regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
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BIT(offset), value ? BIT(offset) : 0);
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}
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static int lp87565_gpio_get_direction(struct gpio_chip *chip,
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unsigned int offset)
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{
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struct lp87565_gpio *gpio = gpiochip_get_data(chip);
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int ret, val;
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ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
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if (ret < 0)
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return ret;
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if (val & BIT(offset))
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return GPIO_LINE_DIRECTION_OUT;
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return GPIO_LINE_DIRECTION_IN;
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}
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static int lp87565_gpio_direction_input(struct gpio_chip *chip,
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unsigned int offset)
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{
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struct lp87565_gpio *gpio = gpiochip_get_data(chip);
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return regmap_update_bits(gpio->map,
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LP87565_REG_GPIO_CONFIG,
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BIT(offset), 0);
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}
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static int lp87565_gpio_direction_output(struct gpio_chip *chip,
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unsigned int offset, int value)
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{
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struct lp87565_gpio *gpio = gpiochip_get_data(chip);
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lp87565_gpio_set(chip, offset, value);
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return regmap_update_bits(gpio->map,
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LP87565_REG_GPIO_CONFIG,
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BIT(offset), BIT(offset));
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}
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static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
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{
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struct lp87565_gpio *gpio = gpiochip_get_data(gc);
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int ret;
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switch (offset) {
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case 0:
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case 1:
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case 2:
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/*
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* MUX can program the pin to be in EN1/2/3 pin mode
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* Or GPIO1/2/3 mode.
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* Setup the GPIO*_SEL MUX to GPIO mode
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*/
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ret = regmap_update_bits(gpio->map,
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LP87565_REG_PIN_FUNCTION,
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BIT(offset), BIT(offset));
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if (ret)
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return ret;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
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unsigned long config)
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{
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struct lp87565_gpio *gpio = gpiochip_get_data(gc);
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switch (pinconf_to_config_param(config)) {
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case PIN_CONFIG_DRIVE_OPEN_DRAIN:
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return regmap_update_bits(gpio->map,
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LP87565_REG_GPIO_CONFIG,
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BIT(offset +
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__ffs(LP87565_GPIO1_OD)),
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BIT(offset +
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__ffs(LP87565_GPIO1_OD)));
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case PIN_CONFIG_DRIVE_PUSH_PULL:
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return regmap_update_bits(gpio->map,
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LP87565_REG_GPIO_CONFIG,
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BIT(offset +
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__ffs(LP87565_GPIO1_OD)), 0);
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default:
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return -ENOTSUPP;
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}
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}
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static const struct gpio_chip template_chip = {
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.label = "lp87565-gpio",
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.owner = THIS_MODULE,
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.request = lp87565_gpio_request,
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.get_direction = lp87565_gpio_get_direction,
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.direction_input = lp87565_gpio_direction_input,
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.direction_output = lp87565_gpio_direction_output,
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.get = lp87565_gpio_get,
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.set = lp87565_gpio_set,
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.set_config = lp87565_gpio_set_config,
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.base = -1,
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.ngpio = 3,
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.can_sleep = true,
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};
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static int lp87565_gpio_probe(struct platform_device *pdev)
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{
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struct lp87565_gpio *gpio;
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struct lp87565 *lp87565;
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int ret;
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gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
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if (!gpio)
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return -ENOMEM;
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lp87565 = dev_get_drvdata(pdev->dev.parent);
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gpio->chip = template_chip;
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gpio->chip.parent = lp87565->dev;
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gpio->map = lp87565->regmap;
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ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
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if (ret < 0) {
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dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
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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 const struct platform_device_id lp87565_gpio_id_table[] = {
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{ "lp87565-q1-gpio", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
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static struct platform_driver lp87565_gpio_driver = {
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.driver = {
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.name = "lp87565-gpio",
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},
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.probe = lp87565_gpio_probe,
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.id_table = lp87565_gpio_id_table,
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};
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module_platform_driver(lp87565_gpio_driver);
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MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
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MODULE_DESCRIPTION("LP87565 GPIO driver");
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MODULE_LICENSE("GPL v2");
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