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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * GPIO driver for RICOH583 power management chip.4 *5 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.6 * Author: Laxman dewangan <ldewangan@nvidia.com>7 *8 * Based on code9 * Copyright (C) 2011 RICOH COMPANY,LTD10 */11#include <linux/init.h>12#include <linux/kernel.h>13#include <linux/slab.h>14#include <linux/platform_device.h>15#include <linux/device.h>16#include <linux/gpio/driver.h>17#include <linux/mfd/rc5t583.h>18 19struct rc5t583_gpio {20 struct gpio_chip gpio_chip;21 struct rc5t583 *rc5t583;22};23 24static int rc5t583_gpio_get(struct gpio_chip *gc, unsigned int offset)25{26 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);27 struct device *parent = rc5t583_gpio->rc5t583->dev;28 uint8_t val = 0;29 int ret;30 31 ret = rc5t583_read(parent, RC5T583_GPIO_MON_IOIN, &val);32 if (ret < 0)33 return ret;34 35 return !!(val & BIT(offset));36}37 38static void rc5t583_gpio_set(struct gpio_chip *gc, unsigned int offset, int val)39{40 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);41 struct device *parent = rc5t583_gpio->rc5t583->dev;42 if (val)43 rc5t583_set_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));44 else45 rc5t583_clear_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));46}47 48static int rc5t583_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)49{50 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);51 struct device *parent = rc5t583_gpio->rc5t583->dev;52 int ret;53 54 ret = rc5t583_clear_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));55 if (ret < 0)56 return ret;57 58 /* Set pin to gpio mode */59 return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));60}61 62static int rc5t583_gpio_dir_output(struct gpio_chip *gc, unsigned offset,63 int value)64{65 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);66 struct device *parent = rc5t583_gpio->rc5t583->dev;67 int ret;68 69 rc5t583_gpio_set(gc, offset, value);70 ret = rc5t583_set_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));71 if (ret < 0)72 return ret;73 74 /* Set pin to gpio mode */75 return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));76}77 78static int rc5t583_gpio_to_irq(struct gpio_chip *gc, unsigned offset)79{80 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);81 82 if (offset < RC5T583_MAX_GPIO)83 return rc5t583_gpio->rc5t583->irq_base +84 RC5T583_IRQ_GPIO0 + offset;85 return -EINVAL;86}87 88static void rc5t583_gpio_free(struct gpio_chip *gc, unsigned offset)89{90 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);91 struct device *parent = rc5t583_gpio->rc5t583->dev;92 93 rc5t583_set_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));94}95 96static int rc5t583_gpio_probe(struct platform_device *pdev)97{98 struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);99 struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);100 struct rc5t583_gpio *rc5t583_gpio;101 102 rc5t583_gpio = devm_kzalloc(&pdev->dev, sizeof(*rc5t583_gpio),103 GFP_KERNEL);104 if (!rc5t583_gpio)105 return -ENOMEM;106 107 rc5t583_gpio->gpio_chip.label = "gpio-rc5t583",108 rc5t583_gpio->gpio_chip.owner = THIS_MODULE,109 rc5t583_gpio->gpio_chip.free = rc5t583_gpio_free,110 rc5t583_gpio->gpio_chip.direction_input = rc5t583_gpio_dir_input,111 rc5t583_gpio->gpio_chip.direction_output = rc5t583_gpio_dir_output,112 rc5t583_gpio->gpio_chip.set = rc5t583_gpio_set,113 rc5t583_gpio->gpio_chip.get = rc5t583_gpio_get,114 rc5t583_gpio->gpio_chip.to_irq = rc5t583_gpio_to_irq,115 rc5t583_gpio->gpio_chip.ngpio = RC5T583_MAX_GPIO,116 rc5t583_gpio->gpio_chip.can_sleep = true,117 rc5t583_gpio->gpio_chip.parent = &pdev->dev;118 rc5t583_gpio->gpio_chip.base = -1;119 rc5t583_gpio->rc5t583 = rc5t583;120 121 if (pdata && pdata->gpio_base)122 rc5t583_gpio->gpio_chip.base = pdata->gpio_base;123 124 return devm_gpiochip_add_data(&pdev->dev, &rc5t583_gpio->gpio_chip,125 rc5t583_gpio);126}127 128static struct platform_driver rc5t583_gpio_driver = {129 .driver = {130 .name = "rc5t583-gpio",131 },132 .probe = rc5t583_gpio_probe,133};134 135static int __init rc5t583_gpio_init(void)136{137 return platform_driver_register(&rc5t583_gpio_driver);138}139subsys_initcall(rc5t583_gpio_init);140