1/*
2 * GPIO driver for RICOH583 power management chip.
3 *
4 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
5 * Author: Laxman dewangan <ldewangan@nvidia.com>
6 *
7 * Based on code
8 * Copyright (C) 2011 RICOH COMPANY,LTD
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms and conditions of the GNU General Public License,
12 * version 2, as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope it will be useful, but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
17 * more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 *
22 */
23#include <linux/init.h>
24#include <linux/kernel.h>
25#include <linux/slab.h>
26#include <linux/platform_device.h>
27#include <linux/device.h>
28#include <linux/gpio/driver.h>
29#include <linux/mfd/rc5t583.h>
30
31struct rc5t583_gpio {
32 struct gpio_chip gpio_chip;
33 struct rc5t583 *rc5t583;
34};
35
36static int rc5t583_gpio_get(struct gpio_chip *gc, unsigned int offset)
37{
38 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
39 struct device *parent = rc5t583_gpio->rc5t583->dev;
40 uint8_t val = 0;
41 int ret;
42
43 ret = rc5t583_read(parent, RC5T583_GPIO_MON_IOIN, &val);
44 if (ret < 0)
45 return ret;
46
47 return !!(val & BIT(offset));
48}
49
50static void rc5t583_gpio_set(struct gpio_chip *gc, unsigned int offset, int val)
51{
52 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
53 struct device *parent = rc5t583_gpio->rc5t583->dev;
54 if (val)
55 rc5t583_set_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));
56 else
57 rc5t583_clear_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));
58}
59
60static int rc5t583_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)
61{
62 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
63 struct device *parent = rc5t583_gpio->rc5t583->dev;
64 int ret;
65
66 ret = rc5t583_clear_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
67 if (ret < 0)
68 return ret;
69
70 /* Set pin to gpio mode */
71 return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
72}
73
74static int rc5t583_gpio_dir_output(struct gpio_chip *gc, unsigned offset,
75 int value)
76{
77 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
78 struct device *parent = rc5t583_gpio->rc5t583->dev;
79 int ret;
80
81 rc5t583_gpio_set(gc, offset, value);
82 ret = rc5t583_set_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
83 if (ret < 0)
84 return ret;
85
86 /* Set pin to gpio mode */
87 return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
88}
89
90static int rc5t583_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
91{
92 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
93
94 if (offset < RC5T583_MAX_GPIO)
95 return rc5t583_gpio->rc5t583->irq_base +
96 RC5T583_IRQ_GPIO0 + offset;
97 return -EINVAL;
98}
99
100static void rc5t583_gpio_free(struct gpio_chip *gc, unsigned offset)
101{
102 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
103 struct device *parent = rc5t583_gpio->rc5t583->dev;
104
105 rc5t583_set_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
106}
107
108static int rc5t583_gpio_probe(struct platform_device *pdev)
109{
110 struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
111 struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
112 struct rc5t583_gpio *rc5t583_gpio;
113
114 rc5t583_gpio = devm_kzalloc(&pdev->dev, sizeof(*rc5t583_gpio),
115 GFP_KERNEL);
116 if (!rc5t583_gpio)
117 return -ENOMEM;
118
119 rc5t583_gpio->gpio_chip.label = "gpio-rc5t583",
120 rc5t583_gpio->gpio_chip.owner = THIS_MODULE,
121 rc5t583_gpio->gpio_chip.free = rc5t583_gpio_free,
122 rc5t583_gpio->gpio_chip.direction_input = rc5t583_gpio_dir_input,
123 rc5t583_gpio->gpio_chip.direction_output = rc5t583_gpio_dir_output,
124 rc5t583_gpio->gpio_chip.set = rc5t583_gpio_set,
125 rc5t583_gpio->gpio_chip.get = rc5t583_gpio_get,
126 rc5t583_gpio->gpio_chip.to_irq = rc5t583_gpio_to_irq,
127 rc5t583_gpio->gpio_chip.ngpio = RC5T583_MAX_GPIO,
128 rc5t583_gpio->gpio_chip.can_sleep = true,
129 rc5t583_gpio->gpio_chip.parent = &pdev->dev;
130 rc5t583_gpio->gpio_chip.base = -1;
131 rc5t583_gpio->rc5t583 = rc5t583;
132
133 if (pdata && pdata->gpio_base)
134 rc5t583_gpio->gpio_chip.base = pdata->gpio_base;
135
136 platform_set_drvdata(pdev, rc5t583_gpio);
137
138 return devm_gpiochip_add_data(&pdev->dev, &rc5t583_gpio->gpio_chip,
139 rc5t583_gpio);
140}
141
142static struct platform_driver rc5t583_gpio_driver = {
143 .driver = {
144 .name = "rc5t583-gpio",
145 },
146 .probe = rc5t583_gpio_probe,
147};
148
149static int __init rc5t583_gpio_init(void)
150{
151 return platform_driver_register(&rc5t583_gpio_driver);
152}
153subsys_initcall(rc5t583_gpio_init);
154