/* * GPIO driver for TPS68470 PMIC * * Copyright (C) 2017 Intel Corporation * * Authors: * Antti Laakso <antti.laakso@intel.com> * Tianshu Qiu <tian.shu.qiu@intel.com> * Jian Xu Zheng <jian.xu.zheng@intel.com> * Yuning Pu <yuning.pu@intel.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation version 2. * * This program is distributed "as is" WITHOUT ANY WARRANTY of any * kind, whether express or implied; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/gpio/driver.h> #include <linux/mfd/tps68470.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/regmap.h> #define TPS68470_N_LOGIC_OUTPUT 3 #define TPS68470_N_REGULAR_GPIO 7 #define TPS68470_N_GPIO (TPS68470_N_LOGIC_OUTPUT + TPS68470_N_REGULAR_GPIO) struct tps68470_gpio_data { struct regmap *tps68470_regmap; struct gpio_chip gc; }; static int tps68470_gpio_get(struct gpio_chip *gc, unsigned int offset) { struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); struct regmap *regmap = tps68470_gpio->tps68470_regmap; unsigned int reg = TPS68470_REG_GPDO; int val, ret; if (offset >= TPS68470_N_REGULAR_GPIO) { offset -= TPS68470_N_REGULAR_GPIO; reg = TPS68470_REG_SGPO; } ret = regmap_read(regmap, reg, &val); if (ret) { dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n", TPS68470_REG_SGPO); return ret; } return !!(val & BIT(offset)); } /* Return 0 if output, 1 if input */ static int tps68470_gpio_get_direction(struct gpio_chip *gc, unsigned int offset) { struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); struct regmap *regmap = tps68470_gpio->tps68470_regmap; int val, ret; /* rest are always outputs */ if (offset >= TPS68470_N_REGULAR_GPIO) return 0; ret = regmap_read(regmap, TPS68470_GPIO_CTL_REG_A(offset), &val); if (ret) { dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n", TPS68470_GPIO_CTL_REG_A(offset)); return ret; } val &= TPS68470_GPIO_MODE_MASK; return val >= TPS68470_GPIO_MODE_OUT_CMOS ? 0 : 1; } static void tps68470_gpio_set(struct gpio_chip *gc, unsigned int offset, int value) { struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); struct regmap *regmap = tps68470_gpio->tps68470_regmap; unsigned int reg = TPS68470_REG_GPDO; if (offset >= TPS68470_N_REGULAR_GPIO) { reg = TPS68470_REG_SGPO; offset -= TPS68470_N_REGULAR_GPIO; } regmap_update_bits(regmap, reg, BIT(offset), value ? BIT(offset) : 0); } static int tps68470_gpio_output(struct gpio_chip *gc, unsigned int offset, int value) { struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); struct regmap *regmap = tps68470_gpio->tps68470_regmap; /* rest are always outputs */ if (offset >= TPS68470_N_REGULAR_GPIO) return 0; /* Set the initial value */ tps68470_gpio_set(gc, offset, value); return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset), TPS68470_GPIO_MODE_MASK, TPS68470_GPIO_MODE_OUT_CMOS); } static int tps68470_gpio_input(struct gpio_chip *gc, unsigned int offset) { struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); struct regmap *regmap = tps68470_gpio->tps68470_regmap; /* rest are always outputs */ if (offset >= TPS68470_N_REGULAR_GPIO) return -EINVAL; return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset), TPS68470_GPIO_MODE_MASK, 0x00); } static const char *tps68470_names[TPS68470_N_GPIO] = { "gpio.0", "gpio.1", "gpio.2", "gpio.3", "gpio.4", "gpio.5", "gpio.6", "s_enable", "s_idle", "s_resetn", }; static int tps68470_gpio_probe(struct platform_device *pdev) { struct tps68470_gpio_data *tps68470_gpio; int ret; tps68470_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps68470_gpio), GFP_KERNEL); if (!tps68470_gpio) return -ENOMEM; tps68470_gpio->tps68470_regmap = dev_get_drvdata(pdev->dev.parent); tps68470_gpio->gc.label = "tps68470-gpio"; tps68470_gpio->gc.owner = THIS_MODULE; tps68470_gpio->gc.direction_input = tps68470_gpio_input; tps68470_gpio->gc.direction_output = tps68470_gpio_output; tps68470_gpio->gc.get = tps68470_gpio_get; tps68470_gpio->gc.get_direction = tps68470_gpio_get_direction; tps68470_gpio->gc.set = tps68470_gpio_set; tps68470_gpio->gc.can_sleep = true; tps68470_gpio->gc.names = tps68470_names; tps68470_gpio->gc.ngpio = TPS68470_N_GPIO; tps68470_gpio->gc.base = -1; tps68470_gpio->gc.parent = &pdev->dev; ret = devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc, tps68470_gpio); if (ret < 0) { dev_err(&pdev->dev, "Failed to register gpio_chip: %d\n", ret); return ret; } platform_set_drvdata(pdev, tps68470_gpio); return ret; } static struct platform_driver tps68470_gpio_driver = { .driver = { .name = "tps68470-gpio", }, .probe = tps68470_gpio_probe, }; builtin_platform_driver(tps68470_gpio_driver)