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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);
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/module.h>
27#include <linux/platform_device.h>
28#include <linux/device.h>
29#include <linux/gpio.h>
30#include <linux/mfd/rc5t583.h>
31
32struct rc5t583_gpio {
33 struct gpio_chip gpio_chip;
34 struct rc5t583 *rc5t583;
35};
36
37static inline struct rc5t583_gpio *to_rc5t583_gpio(struct gpio_chip *chip)
38{
39 return container_of(chip, struct rc5t583_gpio, gpio_chip);
40}
41
42static int rc5t583_gpio_get(struct gpio_chip *gc, unsigned int offset)
43{
44 struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
45 struct device *parent = rc5t583_gpio->rc5t583->dev;
46 uint8_t val = 0;
47 int ret;
48
49 ret = rc5t583_read(parent, RC5T583_GPIO_MON_IOIN, &val);
50 if (ret < 0)
51 return ret;
52
53 return !!(val & BIT(offset));
54}
55
56static void rc5t583_gpio_set(struct gpio_chip *gc, unsigned int offset, int val)
57{
58 struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
59 struct device *parent = rc5t583_gpio->rc5t583->dev;
60 if (val)
61 rc5t583_set_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));
62 else
63 rc5t583_clear_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));
64}
65
66static int rc5t583_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)
67{
68 struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
69 struct device *parent = rc5t583_gpio->rc5t583->dev;
70 int ret;
71
72 ret = rc5t583_clear_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
73 if (ret < 0)
74 return ret;
75
76 /* Set pin to gpio mode */
77 return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
78}
79
80static int rc5t583_gpio_dir_output(struct gpio_chip *gc, unsigned offset,
81 int value)
82{
83 struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
84 struct device *parent = rc5t583_gpio->rc5t583->dev;
85 int ret;
86
87 rc5t583_gpio_set(gc, offset, value);
88 ret = rc5t583_set_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
89 if (ret < 0)
90 return ret;
91
92 /* Set pin to gpio mode */
93 return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
94}
95
96static int rc5t583_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
97{
98 struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
99
100 if (offset < RC5T583_MAX_GPIO)
101 return rc5t583_gpio->rc5t583->irq_base +
102 RC5T583_IRQ_GPIO0 + offset;
103 return -EINVAL;
104}
105
106static void rc5t583_gpio_free(struct gpio_chip *gc, unsigned offset)
107{
108 struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
109 struct device *parent = rc5t583_gpio->rc5t583->dev;
110
111 rc5t583_set_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
112}
113
114static int rc5t583_gpio_probe(struct platform_device *pdev)
115{
116 struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
117 struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
118 struct rc5t583_gpio *rc5t583_gpio;
119
120 rc5t583_gpio = devm_kzalloc(&pdev->dev, sizeof(*rc5t583_gpio),
121 GFP_KERNEL);
122 if (!rc5t583_gpio) {
123 dev_warn(&pdev->dev, "Mem allocation for rc5t583_gpio failed");
124 return -ENOMEM;
125 }
126
127 rc5t583_gpio->gpio_chip.label = "gpio-rc5t583",
128 rc5t583_gpio->gpio_chip.owner = THIS_MODULE,
129 rc5t583_gpio->gpio_chip.free = rc5t583_gpio_free,
130 rc5t583_gpio->gpio_chip.direction_input = rc5t583_gpio_dir_input,
131 rc5t583_gpio->gpio_chip.direction_output = rc5t583_gpio_dir_output,
132 rc5t583_gpio->gpio_chip.set = rc5t583_gpio_set,
133 rc5t583_gpio->gpio_chip.get = rc5t583_gpio_get,
134 rc5t583_gpio->gpio_chip.to_irq = rc5t583_gpio_to_irq,
135 rc5t583_gpio->gpio_chip.ngpio = RC5T583_MAX_GPIO,
136 rc5t583_gpio->gpio_chip.can_sleep = true,
137 rc5t583_gpio->gpio_chip.dev = &pdev->dev;
138 rc5t583_gpio->gpio_chip.base = -1;
139 rc5t583_gpio->rc5t583 = rc5t583;
140
141 if (pdata && pdata->gpio_base)
142 rc5t583_gpio->gpio_chip.base = pdata->gpio_base;
143
144 platform_set_drvdata(pdev, rc5t583_gpio);
145
146 return gpiochip_add(&rc5t583_gpio->gpio_chip);
147}
148
149static int rc5t583_gpio_remove(struct platform_device *pdev)
150{
151 struct rc5t583_gpio *rc5t583_gpio = platform_get_drvdata(pdev);
152
153 return gpiochip_remove(&rc5t583_gpio->gpio_chip);
154}
155
156static struct platform_driver rc5t583_gpio_driver = {
157 .driver = {
158 .name = "rc5t583-gpio",
159 .owner = THIS_MODULE,
160 },
161 .probe = rc5t583_gpio_probe,
162 .remove = rc5t583_gpio_remove,
163};
164
165static int __init rc5t583_gpio_init(void)
166{
167 return platform_driver_register(&rc5t583_gpio_driver);
168}
169subsys_initcall(rc5t583_gpio_init);
170
171static void __exit rc5t583_gpio_exit(void)
172{
173 platform_driver_unregister(&rc5t583_gpio_driver);
174}
175module_exit(rc5t583_gpio_exit);
176
177MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
178MODULE_DESCRIPTION("GPIO interface for RC5T583");
179MODULE_LICENSE("GPL v2");
180MODULE_ALIAS("platform:rc5t583-gpio");