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 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
 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	platform_set_drvdata(pdev, rc5t583_gpio);
125
126	return devm_gpiochip_add_data(&pdev->dev, &rc5t583_gpio->gpio_chip,
127				      rc5t583_gpio);
128}
129
130static struct platform_driver rc5t583_gpio_driver = {
131	.driver = {
132		.name    = "rc5t583-gpio",
133	},
134	.probe		= rc5t583_gpio_probe,
135};
136
137static int __init rc5t583_gpio_init(void)
138{
139	return platform_driver_register(&rc5t583_gpio_driver);
140}
141subsys_initcall(rc5t583_gpio_init);