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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>
175 lines
4.1 KiB
C
175 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2016 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 TPS65218 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/lp873x.h>
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#define BITS_PER_GPO 0x4
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#define LP873X_GPO_CTRL_OD 0x2
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struct lp873x_gpio {
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struct gpio_chip chip;
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struct lp873x *lp873;
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};
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static int lp873x_gpio_get_direction(struct gpio_chip *chip,
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unsigned int offset)
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{
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/* This device is output only */
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return GPIO_LINE_DIRECTION_OUT;
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}
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static int lp873x_gpio_direction_input(struct gpio_chip *chip,
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unsigned int 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 lp873x_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 lp873x_gpio *gpio = gpiochip_get_data(chip);
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/* Set the initial value */
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return regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL,
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BIT(offset * BITS_PER_GPO),
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value ? BIT(offset * BITS_PER_GPO) : 0);
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}
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static int lp873x_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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struct lp873x_gpio *gpio = gpiochip_get_data(chip);
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int ret, val;
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ret = regmap_read(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, &val);
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if (ret < 0)
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return ret;
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return val & BIT(offset * BITS_PER_GPO);
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}
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static void lp873x_gpio_set(struct gpio_chip *chip, unsigned int offset,
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int value)
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{
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struct lp873x_gpio *gpio = gpiochip_get_data(chip);
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regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL,
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BIT(offset * BITS_PER_GPO),
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value ? BIT(offset * BITS_PER_GPO) : 0);
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}
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static int lp873x_gpio_request(struct gpio_chip *gc, unsigned int offset)
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{
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struct lp873x_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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/* No MUX Set up Needed for GPO */
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break;
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case 1:
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/* Setup the CLKIN_PIN_SEL MUX to GPO2 */
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ret = regmap_update_bits(gpio->lp873->regmap, LP873X_REG_CONFIG,
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LP873X_CONFIG_CLKIN_PIN_SEL, 0);
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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 lp873x_gpio_set_config(struct gpio_chip *gc, unsigned offset,
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unsigned long config)
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{
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struct lp873x_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->lp873->regmap,
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LP873X_REG_GPO_CTRL,
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BIT(offset * BITS_PER_GPO +
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LP873X_GPO_CTRL_OD),
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BIT(offset * BITS_PER_GPO +
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LP873X_GPO_CTRL_OD));
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case PIN_CONFIG_DRIVE_PUSH_PULL:
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return regmap_update_bits(gpio->lp873->regmap,
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LP873X_REG_GPO_CTRL,
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BIT(offset * BITS_PER_GPO +
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LP873X_GPO_CTRL_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 = "lp873x-gpio",
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.owner = THIS_MODULE,
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.request = lp873x_gpio_request,
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.get_direction = lp873x_gpio_get_direction,
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.direction_input = lp873x_gpio_direction_input,
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.direction_output = lp873x_gpio_direction_output,
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.get = lp873x_gpio_get,
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.set = lp873x_gpio_set,
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.set_config = lp873x_gpio_set_config,
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.base = -1,
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.ngpio = 2,
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.can_sleep = true,
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};
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static int lp873x_gpio_probe(struct platform_device *pdev)
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{
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struct lp873x_gpio *gpio;
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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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platform_set_drvdata(pdev, gpio);
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gpio->lp873 = dev_get_drvdata(pdev->dev.parent);
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gpio->chip = template_chip;
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gpio->chip.parent = gpio->lp873->dev;
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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 lp873x_gpio_id_table[] = {
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{ "lp873x-gpio", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(platform, lp873x_gpio_id_table);
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static struct platform_driver lp873x_gpio_driver = {
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.driver = {
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.name = "lp873x-gpio",
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},
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.probe = lp873x_gpio_probe,
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.id_table = lp873x_gpio_id_table,
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};
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module_platform_driver(lp873x_gpio_driver);
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MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
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MODULE_DESCRIPTION("LP873X GPIO driver");
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MODULE_LICENSE("GPL v2");
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