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e9fe32bc LD |
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 | ||
32 | struct rc5t583_gpio { | |
33 | struct gpio_chip gpio_chip; | |
34 | struct rc5t583 *rc5t583; | |
35 | }; | |
36 | ||
e9fe32bc LD |
37 | static int rc5t583_gpio_get(struct gpio_chip *gc, unsigned int offset) |
38 | { | |
d660c68e | 39 | struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); |
e9fe32bc LD |
40 | struct device *parent = rc5t583_gpio->rc5t583->dev; |
41 | uint8_t val = 0; | |
42 | int ret; | |
43 | ||
44 | ret = rc5t583_read(parent, RC5T583_GPIO_MON_IOIN, &val); | |
45 | if (ret < 0) | |
46 | return ret; | |
47 | ||
48 | return !!(val & BIT(offset)); | |
49 | } | |
50 | ||
51 | static void rc5t583_gpio_set(struct gpio_chip *gc, unsigned int offset, int val) | |
52 | { | |
d660c68e | 53 | struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); |
e9fe32bc LD |
54 | struct device *parent = rc5t583_gpio->rc5t583->dev; |
55 | if (val) | |
56 | rc5t583_set_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset)); | |
57 | else | |
58 | rc5t583_clear_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset)); | |
59 | } | |
60 | ||
61 | static int rc5t583_gpio_dir_input(struct gpio_chip *gc, unsigned int offset) | |
62 | { | |
d660c68e | 63 | struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); |
e9fe32bc LD |
64 | struct device *parent = rc5t583_gpio->rc5t583->dev; |
65 | int ret; | |
66 | ||
67 | ret = rc5t583_clear_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset)); | |
68 | if (ret < 0) | |
69 | return ret; | |
70 | ||
71 | /* Set pin to gpio mode */ | |
72 | return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset)); | |
73 | } | |
74 | ||
75 | static int rc5t583_gpio_dir_output(struct gpio_chip *gc, unsigned offset, | |
76 | int value) | |
77 | { | |
d660c68e | 78 | struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); |
e9fe32bc LD |
79 | struct device *parent = rc5t583_gpio->rc5t583->dev; |
80 | int ret; | |
81 | ||
82 | rc5t583_gpio_set(gc, offset, value); | |
83 | ret = rc5t583_set_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset)); | |
84 | if (ret < 0) | |
85 | return ret; | |
86 | ||
87 | /* Set pin to gpio mode */ | |
88 | return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset)); | |
89 | } | |
90 | ||
91 | static int rc5t583_gpio_to_irq(struct gpio_chip *gc, unsigned offset) | |
92 | { | |
d660c68e | 93 | struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); |
e9fe32bc | 94 | |
3bde4d26 | 95 | if (offset < RC5T583_MAX_GPIO) |
e9fe32bc LD |
96 | return rc5t583_gpio->rc5t583->irq_base + |
97 | RC5T583_IRQ_GPIO0 + offset; | |
98 | return -EINVAL; | |
99 | } | |
100 | ||
101 | static void rc5t583_gpio_free(struct gpio_chip *gc, unsigned offset) | |
102 | { | |
d660c68e | 103 | struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); |
e9fe32bc LD |
104 | struct device *parent = rc5t583_gpio->rc5t583->dev; |
105 | ||
106 | rc5t583_set_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset)); | |
107 | } | |
108 | ||
3836309d | 109 | static int rc5t583_gpio_probe(struct platform_device *pdev) |
e9fe32bc LD |
110 | { |
111 | struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent); | |
112 | struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev); | |
113 | struct rc5t583_gpio *rc5t583_gpio; | |
114 | ||
115 | rc5t583_gpio = devm_kzalloc(&pdev->dev, sizeof(*rc5t583_gpio), | |
116 | GFP_KERNEL); | |
4b7dfd7f | 117 | if (!rc5t583_gpio) |
e9fe32bc | 118 | return -ENOMEM; |
e9fe32bc LD |
119 | |
120 | rc5t583_gpio->gpio_chip.label = "gpio-rc5t583", | |
121 | rc5t583_gpio->gpio_chip.owner = THIS_MODULE, | |
122 | rc5t583_gpio->gpio_chip.free = rc5t583_gpio_free, | |
123 | rc5t583_gpio->gpio_chip.direction_input = rc5t583_gpio_dir_input, | |
124 | rc5t583_gpio->gpio_chip.direction_output = rc5t583_gpio_dir_output, | |
125 | rc5t583_gpio->gpio_chip.set = rc5t583_gpio_set, | |
126 | rc5t583_gpio->gpio_chip.get = rc5t583_gpio_get, | |
127 | rc5t583_gpio->gpio_chip.to_irq = rc5t583_gpio_to_irq, | |
128 | rc5t583_gpio->gpio_chip.ngpio = RC5T583_MAX_GPIO, | |
9fb1f39e | 129 | rc5t583_gpio->gpio_chip.can_sleep = true, |
58383c78 | 130 | rc5t583_gpio->gpio_chip.parent = &pdev->dev; |
e9fe32bc LD |
131 | rc5t583_gpio->gpio_chip.base = -1; |
132 | rc5t583_gpio->rc5t583 = rc5t583; | |
133 | ||
134 | if (pdata && pdata->gpio_base) | |
135 | rc5t583_gpio->gpio_chip.base = pdata->gpio_base; | |
136 | ||
137 | platform_set_drvdata(pdev, rc5t583_gpio); | |
138 | ||
d660c68e | 139 | return gpiochip_add_data(&rc5t583_gpio->gpio_chip, rc5t583_gpio); |
e9fe32bc LD |
140 | } |
141 | ||
206210ce | 142 | static int rc5t583_gpio_remove(struct platform_device *pdev) |
e9fe32bc LD |
143 | { |
144 | struct rc5t583_gpio *rc5t583_gpio = platform_get_drvdata(pdev); | |
145 | ||
9f5132ae | 146 | gpiochip_remove(&rc5t583_gpio->gpio_chip); |
147 | return 0; | |
e9fe32bc LD |
148 | } |
149 | ||
150 | static struct platform_driver rc5t583_gpio_driver = { | |
151 | .driver = { | |
152 | .name = "rc5t583-gpio", | |
e9fe32bc LD |
153 | }, |
154 | .probe = rc5t583_gpio_probe, | |
8283c4ff | 155 | .remove = rc5t583_gpio_remove, |
e9fe32bc LD |
156 | }; |
157 | ||
158 | static int __init rc5t583_gpio_init(void) | |
159 | { | |
160 | return platform_driver_register(&rc5t583_gpio_driver); | |
161 | } | |
162 | subsys_initcall(rc5t583_gpio_init); | |
163 | ||
164 | static void __exit rc5t583_gpio_exit(void) | |
165 | { | |
166 | platform_driver_unregister(&rc5t583_gpio_driver); | |
167 | } | |
168 | module_exit(rc5t583_gpio_exit); | |
169 | ||
170 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
171 | MODULE_DESCRIPTION("GPIO interface for RC5T583"); | |
172 | MODULE_LICENSE("GPL v2"); | |
173 | MODULE_ALIAS("platform:rc5t583-gpio"); |