1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 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 code 9 * Copyright (C) 2011 RICOH COMPANY,LTD 10 */ 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 19 struct rc5t583_gpio { 20 struct gpio_chip gpio_chip; 21 struct rc5t583 *rc5t583; 22 }; 23 24 static 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 38 static int 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 int ret; 43 44 if (val) 45 ret = rc5t583_set_bits(parent, RC5T583_GPIO_IOOUT, 46 BIT(offset)); 47 else 48 ret = rc5t583_clear_bits(parent, RC5T583_GPIO_IOOUT, 49 BIT(offset)); 50 51 return ret; 52 } 53 54 static int rc5t583_gpio_dir_input(struct gpio_chip *gc, unsigned int offset) 55 { 56 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); 57 struct device *parent = rc5t583_gpio->rc5t583->dev; 58 int ret; 59 60 ret = rc5t583_clear_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset)); 61 if (ret < 0) 62 return ret; 63 64 /* Set pin to gpio mode */ 65 return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset)); 66 } 67 68 static int rc5t583_gpio_dir_output(struct gpio_chip *gc, unsigned offset, 69 int value) 70 { 71 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); 72 struct device *parent = rc5t583_gpio->rc5t583->dev; 73 int ret; 74 75 ret = rc5t583_gpio_set(gc, offset, value); 76 if (ret) 77 return ret; 78 79 ret = rc5t583_set_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset)); 80 if (ret < 0) 81 return ret; 82 83 /* Set pin to gpio mode */ 84 return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset)); 85 } 86 87 static int rc5t583_gpio_to_irq(struct gpio_chip *gc, unsigned offset) 88 { 89 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); 90 91 if (offset < RC5T583_MAX_GPIO) 92 return rc5t583_gpio->rc5t583->irq_base + 93 RC5T583_IRQ_GPIO0 + offset; 94 return -EINVAL; 95 } 96 97 static void rc5t583_gpio_free(struct gpio_chip *gc, unsigned offset) 98 { 99 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); 100 struct device *parent = rc5t583_gpio->rc5t583->dev; 101 102 rc5t583_set_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset)); 103 } 104 105 static int rc5t583_gpio_probe(struct platform_device *pdev) 106 { 107 struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent); 108 struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev); 109 struct rc5t583_gpio *rc5t583_gpio; 110 111 rc5t583_gpio = devm_kzalloc(&pdev->dev, sizeof(*rc5t583_gpio), 112 GFP_KERNEL); 113 if (!rc5t583_gpio) 114 return -ENOMEM; 115 116 rc5t583_gpio->gpio_chip.label = "gpio-rc5t583", 117 rc5t583_gpio->gpio_chip.owner = THIS_MODULE, 118 rc5t583_gpio->gpio_chip.free = rc5t583_gpio_free, 119 rc5t583_gpio->gpio_chip.direction_input = rc5t583_gpio_dir_input, 120 rc5t583_gpio->gpio_chip.direction_output = rc5t583_gpio_dir_output, 121 rc5t583_gpio->gpio_chip.set = rc5t583_gpio_set, 122 rc5t583_gpio->gpio_chip.get = rc5t583_gpio_get, 123 rc5t583_gpio->gpio_chip.to_irq = rc5t583_gpio_to_irq, 124 rc5t583_gpio->gpio_chip.ngpio = RC5T583_MAX_GPIO, 125 rc5t583_gpio->gpio_chip.can_sleep = true, 126 rc5t583_gpio->gpio_chip.parent = &pdev->dev; 127 rc5t583_gpio->gpio_chip.base = -1; 128 rc5t583_gpio->rc5t583 = rc5t583; 129 130 if (pdata && pdata->gpio_base) 131 rc5t583_gpio->gpio_chip.base = pdata->gpio_base; 132 133 return devm_gpiochip_add_data(&pdev->dev, &rc5t583_gpio->gpio_chip, 134 rc5t583_gpio); 135 } 136 137 static struct platform_driver rc5t583_gpio_driver = { 138 .driver = { 139 .name = "rc5t583-gpio", 140 }, 141 .probe = rc5t583_gpio_probe, 142 }; 143 144 static int __init rc5t583_gpio_init(void) 145 { 146 return platform_driver_register(&rc5t583_gpio_driver); 147 } 148 subsys_initcall(rc5t583_gpio_init); 149