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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * GPIO Driver for Dialog DA9055 PMICs.4 *5 * Copyright(c) 2012 Dialog Semiconductor Ltd.6 *7 * Author: David Dajun Chen <dchen@diasemi.com>8 */9#include <linux/module.h>10#include <linux/platform_device.h>11#include <linux/gpio/driver.h>12 13#include <linux/mfd/da9055/core.h>14#include <linux/mfd/da9055/reg.h>15#include <linux/mfd/da9055/pdata.h>16 17#define DA9055_VDD_IO 0x018#define DA9055_PUSH_PULL 0x319#define DA9055_ACT_LOW 0x020#define DA9055_GPI 0x121#define DA9055_PORT_MASK 0x322#define DA9055_PORT_SHIFT(offset) (4 * (offset % 2))23 24#define DA9055_INPUT DA9055_GPI25#define DA9055_OUTPUT DA9055_PUSH_PULL26#define DA9055_IRQ_GPI0 327 28struct da9055_gpio {29 struct da9055 *da9055;30 struct gpio_chip gp;31};32 33static int da9055_gpio_get(struct gpio_chip *gc, unsigned offset)34{35 struct da9055_gpio *gpio = gpiochip_get_data(gc);36 int gpio_direction = 0;37 int ret;38 39 /* Get GPIO direction */40 ret = da9055_reg_read(gpio->da9055, (offset >> 1) + DA9055_REG_GPIO0_1);41 if (ret < 0)42 return ret;43 44 gpio_direction = ret & (DA9055_PORT_MASK) << DA9055_PORT_SHIFT(offset);45 gpio_direction >>= DA9055_PORT_SHIFT(offset);46 switch (gpio_direction) {47 case DA9055_INPUT:48 ret = da9055_reg_read(gpio->da9055, DA9055_REG_STATUS_B);49 if (ret < 0)50 return ret;51 break;52 case DA9055_OUTPUT:53 ret = da9055_reg_read(gpio->da9055, DA9055_REG_GPIO_MODE0_2);54 if (ret < 0)55 return ret;56 }57 58 return ret & (1 << offset);59 60}61 62static void da9055_gpio_set(struct gpio_chip *gc, unsigned offset, int value)63{64 struct da9055_gpio *gpio = gpiochip_get_data(gc);65 66 da9055_reg_update(gpio->da9055,67 DA9055_REG_GPIO_MODE0_2,68 1 << offset,69 value << offset);70}71 72static int da9055_gpio_direction_input(struct gpio_chip *gc, unsigned offset)73{74 struct da9055_gpio *gpio = gpiochip_get_data(gc);75 unsigned char reg_byte;76 77 reg_byte = (DA9055_ACT_LOW | DA9055_GPI)78 << DA9055_PORT_SHIFT(offset);79 80 return da9055_reg_update(gpio->da9055, (offset >> 1) +81 DA9055_REG_GPIO0_1,82 DA9055_PORT_MASK <<83 DA9055_PORT_SHIFT(offset),84 reg_byte);85}86 87static int da9055_gpio_direction_output(struct gpio_chip *gc,88 unsigned offset, int value)89{90 struct da9055_gpio *gpio = gpiochip_get_data(gc);91 unsigned char reg_byte;92 int ret;93 94 reg_byte = (DA9055_VDD_IO | DA9055_PUSH_PULL)95 << DA9055_PORT_SHIFT(offset);96 97 ret = da9055_reg_update(gpio->da9055, (offset >> 1) +98 DA9055_REG_GPIO0_1,99 DA9055_PORT_MASK <<100 DA9055_PORT_SHIFT(offset),101 reg_byte);102 if (ret < 0)103 return ret;104 105 da9055_gpio_set(gc, offset, value);106 107 return 0;108}109 110static int da9055_gpio_to_irq(struct gpio_chip *gc, u32 offset)111{112 struct da9055_gpio *gpio = gpiochip_get_data(gc);113 struct da9055 *da9055 = gpio->da9055;114 115 return regmap_irq_get_virq(da9055->irq_data,116 DA9055_IRQ_GPI0 + offset);117}118 119static const struct gpio_chip reference_gp = {120 .label = "da9055-gpio",121 .owner = THIS_MODULE,122 .get = da9055_gpio_get,123 .set = da9055_gpio_set,124 .direction_input = da9055_gpio_direction_input,125 .direction_output = da9055_gpio_direction_output,126 .to_irq = da9055_gpio_to_irq,127 .can_sleep = true,128 .ngpio = 3,129 .base = -1,130};131 132static int da9055_gpio_probe(struct platform_device *pdev)133{134 struct da9055_gpio *gpio;135 struct da9055_pdata *pdata;136 137 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);138 if (!gpio)139 return -ENOMEM;140 141 gpio->da9055 = dev_get_drvdata(pdev->dev.parent);142 pdata = dev_get_platdata(gpio->da9055->dev);143 144 gpio->gp = reference_gp;145 if (pdata && pdata->gpio_base)146 gpio->gp.base = pdata->gpio_base;147 148 return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);149}150 151static struct platform_driver da9055_gpio_driver = {152 .probe = da9055_gpio_probe,153 .driver = {154 .name = "da9055-gpio",155 },156};157 158static int __init da9055_gpio_init(void)159{160 return platform_driver_register(&da9055_gpio_driver);161}162subsys_initcall(da9055_gpio_init);163 164static void __exit da9055_gpio_exit(void)165{166 platform_driver_unregister(&da9055_gpio_driver);167}168module_exit(da9055_gpio_exit);169 170MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");171MODULE_DESCRIPTION("DA9055 GPIO Device Driver");172MODULE_LICENSE("GPL");173MODULE_ALIAS("platform:da9055-gpio");174