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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 | ||
37 | static inline struct rc5t583_gpio *to_rc5t583_gpio(struct gpio_chip *chip) | |
38 | { | |
39 | return container_of(chip, struct rc5t583_gpio, gpio_chip); | |
40 | } | |
41 | ||
42 | static 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 | ||
56 | static 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 | ||
66 | static 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 | ||
80 | static 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 | ||
96 | static 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 >= 0) && (offset < 8)) | |
101 | return rc5t583_gpio->rc5t583->irq_base + | |
102 | RC5T583_IRQ_GPIO0 + offset; | |
103 | return -EINVAL; | |
104 | } | |
105 | ||
106 | static 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 | ||
3836309d | 114 | static int rc5t583_gpio_probe(struct platform_device *pdev) |
e9fe32bc LD |
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 = 1, | |
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 | ||
206210ce | 149 | static int rc5t583_gpio_remove(struct platform_device *pdev) |
e9fe32bc LD |
150 | { |
151 | struct rc5t583_gpio *rc5t583_gpio = platform_get_drvdata(pdev); | |
152 | ||
153 | return gpiochip_remove(&rc5t583_gpio->gpio_chip); | |
154 | } | |
155 | ||
156 | static struct platform_driver rc5t583_gpio_driver = { | |
157 | .driver = { | |
158 | .name = "rc5t583-gpio", | |
159 | .owner = THIS_MODULE, | |
160 | }, | |
161 | .probe = rc5t583_gpio_probe, | |
8283c4ff | 162 | .remove = rc5t583_gpio_remove, |
e9fe32bc LD |
163 | }; |
164 | ||
165 | static int __init rc5t583_gpio_init(void) | |
166 | { | |
167 | return platform_driver_register(&rc5t583_gpio_driver); | |
168 | } | |
169 | subsys_initcall(rc5t583_gpio_init); | |
170 | ||
171 | static void __exit rc5t583_gpio_exit(void) | |
172 | { | |
173 | platform_driver_unregister(&rc5t583_gpio_driver); | |
174 | } | |
175 | module_exit(rc5t583_gpio_exit); | |
176 | ||
177 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
178 | MODULE_DESCRIPTION("GPIO interface for RC5T583"); | |
179 | MODULE_LICENSE("GPL v2"); | |
180 | MODULE_ALIAS("platform:rc5t583-gpio"); |