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 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 else 45 rc5t583_clear_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset)); 46 } 47 48 static 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 62 static 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 78 static 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 88 static 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 96 static 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 } 127 128 static struct platform_driver rc5t583_gpio_driver = { 129 .driver = { 130 .name = "rc5t583-gpio", 131 }, 132 .probe = rc5t583_gpio_probe, 133 }; 134 135 static int __init rc5t583_gpio_init(void) 136 { 137 return platform_driver_register(&rc5t583_gpio_driver); 138 } 139 subsys_initcall(rc5t583_gpio_init); 140