1ca34b4f0SRajmohan Mani // SPDX-License-Identifier: GPL-2.0 2275b13a6SRajmohan Mani /* 3275b13a6SRajmohan Mani * GPIO driver for TPS68470 PMIC 4275b13a6SRajmohan Mani * 5275b13a6SRajmohan Mani * Copyright (C) 2017 Intel Corporation 6275b13a6SRajmohan Mani * 7275b13a6SRajmohan Mani * Authors: 8275b13a6SRajmohan Mani * Antti Laakso <antti.laakso@intel.com> 9275b13a6SRajmohan Mani * Tianshu Qiu <tian.shu.qiu@intel.com> 10275b13a6SRajmohan Mani * Jian Xu Zheng <jian.xu.zheng@intel.com> 11275b13a6SRajmohan Mani * Yuning Pu <yuning.pu@intel.com> 12275b13a6SRajmohan Mani */ 13275b13a6SRajmohan Mani 14275b13a6SRajmohan Mani #include <linux/gpio/driver.h> 15275b13a6SRajmohan Mani #include <linux/mfd/tps68470.h> 16275b13a6SRajmohan Mani #include <linux/module.h> 17275b13a6SRajmohan Mani #include <linux/platform_device.h> 18275b13a6SRajmohan Mani #include <linux/regmap.h> 19275b13a6SRajmohan Mani 20275b13a6SRajmohan Mani #define TPS68470_N_LOGIC_OUTPUT 3 21275b13a6SRajmohan Mani #define TPS68470_N_REGULAR_GPIO 7 22275b13a6SRajmohan Mani #define TPS68470_N_GPIO (TPS68470_N_LOGIC_OUTPUT + TPS68470_N_REGULAR_GPIO) 23275b13a6SRajmohan Mani 24275b13a6SRajmohan Mani struct tps68470_gpio_data { 25275b13a6SRajmohan Mani struct regmap *tps68470_regmap; 26275b13a6SRajmohan Mani struct gpio_chip gc; 27275b13a6SRajmohan Mani }; 28275b13a6SRajmohan Mani 29275b13a6SRajmohan Mani static int tps68470_gpio_get(struct gpio_chip *gc, unsigned int offset) 30275b13a6SRajmohan Mani { 31275b13a6SRajmohan Mani struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); 32275b13a6SRajmohan Mani struct regmap *regmap = tps68470_gpio->tps68470_regmap; 33275b13a6SRajmohan Mani unsigned int reg = TPS68470_REG_GPDO; 34275b13a6SRajmohan Mani int val, ret; 35275b13a6SRajmohan Mani 36275b13a6SRajmohan Mani if (offset >= TPS68470_N_REGULAR_GPIO) { 37275b13a6SRajmohan Mani offset -= TPS68470_N_REGULAR_GPIO; 38275b13a6SRajmohan Mani reg = TPS68470_REG_SGPO; 39275b13a6SRajmohan Mani } 40275b13a6SRajmohan Mani 41275b13a6SRajmohan Mani ret = regmap_read(regmap, reg, &val); 42275b13a6SRajmohan Mani if (ret) { 43275b13a6SRajmohan Mani dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n", 44275b13a6SRajmohan Mani TPS68470_REG_SGPO); 45275b13a6SRajmohan Mani return ret; 46275b13a6SRajmohan Mani } 47275b13a6SRajmohan Mani return !!(val & BIT(offset)); 48275b13a6SRajmohan Mani } 49275b13a6SRajmohan Mani 50275b13a6SRajmohan Mani static int tps68470_gpio_get_direction(struct gpio_chip *gc, 51275b13a6SRajmohan Mani unsigned int offset) 52275b13a6SRajmohan Mani { 53275b13a6SRajmohan Mani struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); 54275b13a6SRajmohan Mani struct regmap *regmap = tps68470_gpio->tps68470_regmap; 55275b13a6SRajmohan Mani int val, ret; 56275b13a6SRajmohan Mani 57275b13a6SRajmohan Mani /* rest are always outputs */ 58275b13a6SRajmohan Mani if (offset >= TPS68470_N_REGULAR_GPIO) 59e42615ecSMatti Vaittinen return GPIO_LINE_DIRECTION_OUT; 60275b13a6SRajmohan Mani 61275b13a6SRajmohan Mani ret = regmap_read(regmap, TPS68470_GPIO_CTL_REG_A(offset), &val); 62275b13a6SRajmohan Mani if (ret) { 63275b13a6SRajmohan Mani dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n", 64275b13a6SRajmohan Mani TPS68470_GPIO_CTL_REG_A(offset)); 65275b13a6SRajmohan Mani return ret; 66275b13a6SRajmohan Mani } 67275b13a6SRajmohan Mani 68275b13a6SRajmohan Mani val &= TPS68470_GPIO_MODE_MASK; 69e42615ecSMatti Vaittinen return val >= TPS68470_GPIO_MODE_OUT_CMOS ? GPIO_LINE_DIRECTION_OUT : 70e42615ecSMatti Vaittinen GPIO_LINE_DIRECTION_IN; 71275b13a6SRajmohan Mani } 72275b13a6SRajmohan Mani 73275b13a6SRajmohan Mani static void tps68470_gpio_set(struct gpio_chip *gc, unsigned int offset, 74275b13a6SRajmohan Mani int value) 75275b13a6SRajmohan Mani { 76275b13a6SRajmohan Mani struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); 77275b13a6SRajmohan Mani struct regmap *regmap = tps68470_gpio->tps68470_regmap; 78275b13a6SRajmohan Mani unsigned int reg = TPS68470_REG_GPDO; 79275b13a6SRajmohan Mani 80275b13a6SRajmohan Mani if (offset >= TPS68470_N_REGULAR_GPIO) { 81275b13a6SRajmohan Mani reg = TPS68470_REG_SGPO; 82275b13a6SRajmohan Mani offset -= TPS68470_N_REGULAR_GPIO; 83275b13a6SRajmohan Mani } 84275b13a6SRajmohan Mani 85275b13a6SRajmohan Mani regmap_update_bits(regmap, reg, BIT(offset), value ? BIT(offset) : 0); 86275b13a6SRajmohan Mani } 87275b13a6SRajmohan Mani 88275b13a6SRajmohan Mani static int tps68470_gpio_output(struct gpio_chip *gc, unsigned int offset, 89275b13a6SRajmohan Mani int value) 90275b13a6SRajmohan Mani { 91275b13a6SRajmohan Mani struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); 92275b13a6SRajmohan Mani struct regmap *regmap = tps68470_gpio->tps68470_regmap; 93275b13a6SRajmohan Mani 94275b13a6SRajmohan Mani /* rest are always outputs */ 95275b13a6SRajmohan Mani if (offset >= TPS68470_N_REGULAR_GPIO) 96275b13a6SRajmohan Mani return 0; 97275b13a6SRajmohan Mani 98275b13a6SRajmohan Mani /* Set the initial value */ 99275b13a6SRajmohan Mani tps68470_gpio_set(gc, offset, value); 100275b13a6SRajmohan Mani 101275b13a6SRajmohan Mani return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset), 102275b13a6SRajmohan Mani TPS68470_GPIO_MODE_MASK, 103275b13a6SRajmohan Mani TPS68470_GPIO_MODE_OUT_CMOS); 104275b13a6SRajmohan Mani } 105275b13a6SRajmohan Mani 106275b13a6SRajmohan Mani static int tps68470_gpio_input(struct gpio_chip *gc, unsigned int offset) 107275b13a6SRajmohan Mani { 108275b13a6SRajmohan Mani struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc); 109275b13a6SRajmohan Mani struct regmap *regmap = tps68470_gpio->tps68470_regmap; 110275b13a6SRajmohan Mani 111275b13a6SRajmohan Mani /* rest are always outputs */ 112275b13a6SRajmohan Mani if (offset >= TPS68470_N_REGULAR_GPIO) 113275b13a6SRajmohan Mani return -EINVAL; 114275b13a6SRajmohan Mani 115275b13a6SRajmohan Mani return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset), 116275b13a6SRajmohan Mani TPS68470_GPIO_MODE_MASK, 0x00); 117275b13a6SRajmohan Mani } 118275b13a6SRajmohan Mani 119275b13a6SRajmohan Mani static const char *tps68470_names[TPS68470_N_GPIO] = { 120275b13a6SRajmohan Mani "gpio.0", "gpio.1", "gpio.2", "gpio.3", 121275b13a6SRajmohan Mani "gpio.4", "gpio.5", "gpio.6", 122275b13a6SRajmohan Mani "s_enable", "s_idle", "s_resetn", 123275b13a6SRajmohan Mani }; 124275b13a6SRajmohan Mani 125275b13a6SRajmohan Mani static int tps68470_gpio_probe(struct platform_device *pdev) 126275b13a6SRajmohan Mani { 127275b13a6SRajmohan Mani struct tps68470_gpio_data *tps68470_gpio; 128275b13a6SRajmohan Mani 129275b13a6SRajmohan Mani tps68470_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps68470_gpio), 130275b13a6SRajmohan Mani GFP_KERNEL); 131275b13a6SRajmohan Mani if (!tps68470_gpio) 132275b13a6SRajmohan Mani return -ENOMEM; 133275b13a6SRajmohan Mani 134275b13a6SRajmohan Mani tps68470_gpio->tps68470_regmap = dev_get_drvdata(pdev->dev.parent); 135275b13a6SRajmohan Mani tps68470_gpio->gc.label = "tps68470-gpio"; 136275b13a6SRajmohan Mani tps68470_gpio->gc.owner = THIS_MODULE; 137275b13a6SRajmohan Mani tps68470_gpio->gc.direction_input = tps68470_gpio_input; 138275b13a6SRajmohan Mani tps68470_gpio->gc.direction_output = tps68470_gpio_output; 139275b13a6SRajmohan Mani tps68470_gpio->gc.get = tps68470_gpio_get; 140275b13a6SRajmohan Mani tps68470_gpio->gc.get_direction = tps68470_gpio_get_direction; 141275b13a6SRajmohan Mani tps68470_gpio->gc.set = tps68470_gpio_set; 142275b13a6SRajmohan Mani tps68470_gpio->gc.can_sleep = true; 143275b13a6SRajmohan Mani tps68470_gpio->gc.names = tps68470_names; 144275b13a6SRajmohan Mani tps68470_gpio->gc.ngpio = TPS68470_N_GPIO; 145275b13a6SRajmohan Mani tps68470_gpio->gc.base = -1; 146275b13a6SRajmohan Mani tps68470_gpio->gc.parent = &pdev->dev; 147275b13a6SRajmohan Mani 148*91d594b2SAlexandru Ardelean return devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc, tps68470_gpio); 149275b13a6SRajmohan Mani } 150275b13a6SRajmohan Mani 151275b13a6SRajmohan Mani static struct platform_driver tps68470_gpio_driver = { 152275b13a6SRajmohan Mani .driver = { 153275b13a6SRajmohan Mani .name = "tps68470-gpio", 154275b13a6SRajmohan Mani }, 155275b13a6SRajmohan Mani .probe = tps68470_gpio_probe, 156275b13a6SRajmohan Mani }; 157275b13a6SRajmohan Mani 158275b13a6SRajmohan Mani builtin_platform_driver(tps68470_gpio_driver) 159