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	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