/* * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/ * Keerthy <j-keerthy@ti.com> * * 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. * * Based on the TPS65218 driver */ #include <linux/gpio.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/mfd/lp873x.h> #define BITS_PER_GPO 0x4 #define LP873X_GPO_CTRL_OD 0x2 struct lp873x_gpio { struct gpio_chip chip; struct lp873x *lp873; }; static int lp873x_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) { /* This device is output only */ return 0; } static int lp873x_gpio_direction_input(struct gpio_chip *chip, unsigned int offset) { /* This device is output only */ return -EINVAL; } static int lp873x_gpio_direction_output(struct gpio_chip *chip, unsigned int offset, int value) { struct lp873x_gpio *gpio = gpiochip_get_data(chip); /* Set the initial value */ return regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, BIT(offset * BITS_PER_GPO), value ? BIT(offset * BITS_PER_GPO) : 0); } static int lp873x_gpio_get(struct gpio_chip *chip, unsigned int offset) { struct lp873x_gpio *gpio = gpiochip_get_data(chip); int ret, val; ret = regmap_read(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, &val); if (ret < 0) return ret; return val & BIT(offset * BITS_PER_GPO); } static void lp873x_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) { struct lp873x_gpio *gpio = gpiochip_get_data(chip); regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, BIT(offset * BITS_PER_GPO), value ? BIT(offset * BITS_PER_GPO) : 0); } static int lp873x_gpio_request(struct gpio_chip *gc, unsigned int offset) { struct lp873x_gpio *gpio = gpiochip_get_data(gc); int ret; switch (offset) { case 0: /* No MUX Set up Needed for GPO */ break; case 1: /* Setup the CLKIN_PIN_SEL MUX to GPO2 */ ret = regmap_update_bits(gpio->lp873->regmap, LP873X_REG_CONFIG, LP873X_CONFIG_CLKIN_PIN_SEL, 0); if (ret) return ret; break; default: return -EINVAL; } return 0; } static int lp873x_gpio_set_config(struct gpio_chip *gc, unsigned offset, unsigned long config) { struct lp873x_gpio *gpio = gpiochip_get_data(gc); switch (pinconf_to_config_param(config)) { case PIN_CONFIG_DRIVE_OPEN_DRAIN: return regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, BIT(offset * BITS_PER_GPO + LP873X_GPO_CTRL_OD), BIT(offset * BITS_PER_GPO + LP873X_GPO_CTRL_OD)); case PIN_CONFIG_DRIVE_PUSH_PULL: return regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, BIT(offset * BITS_PER_GPO + LP873X_GPO_CTRL_OD), 0); default: return -ENOTSUPP; } } static const struct gpio_chip template_chip = { .label = "lp873x-gpio", .owner = THIS_MODULE, .request = lp873x_gpio_request, .get_direction = lp873x_gpio_get_direction, .direction_input = lp873x_gpio_direction_input, .direction_output = lp873x_gpio_direction_output, .get = lp873x_gpio_get, .set = lp873x_gpio_set, .set_config = lp873x_gpio_set_config, .base = -1, .ngpio = 2, .can_sleep = true, }; static int lp873x_gpio_probe(struct platform_device *pdev) { struct lp873x_gpio *gpio; int ret; gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); if (!gpio) return -ENOMEM; platform_set_drvdata(pdev, gpio); gpio->lp873 = dev_get_drvdata(pdev->dev.parent); gpio->chip = template_chip; gpio->chip.parent = gpio->lp873->dev; ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio); if (ret < 0) { dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); return ret; } return 0; } static const struct platform_device_id lp873x_gpio_id_table[] = { { "lp873x-gpio", }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(platform, lp873x_gpio_id_table); static struct platform_driver lp873x_gpio_driver = { .driver = { .name = "lp873x-gpio", }, .probe = lp873x_gpio_probe, .id_table = lp873x_gpio_id_table, }; module_platform_driver(lp873x_gpio_driver); MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>"); MODULE_DESCRIPTION("LP873X GPIO driver"); MODULE_LICENSE("GPL v2");