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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 | /* * 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) |