gpio-rc5t583.c

  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
 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 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
 54static 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
 68static 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
 87static 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
 97static 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
105static 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
137static struct platform_driver rc5t583_gpio_driver = {
138	.driver = {
139		.name    = "rc5t583-gpio",
140	},
141	.probe		= rc5t583_gpio_probe,
142};
143
144static int __init rc5t583_gpio_init(void)
145{
146	return platform_driver_register(&rc5t583_gpio_driver);
147}
148subsys_initcall(rc5t583_gpio_init);