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9952f691 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e9fe32bc LD |
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 | |
e9fe32bc LD |
10 | */ |
11 | #include <linux/init.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/slab.h> | |
e9fe32bc LD |
14 | #include <linux/platform_device.h> |
15 | #include <linux/device.h> | |
98aef8e7 | 16 | #include <linux/gpio/driver.h> |
e9fe32bc LD |
17 | #include <linux/mfd/rc5t583.h> |
18 | ||
19 | struct rc5t583_gpio { | |
20 | struct gpio_chip gpio_chip; | |
21 | struct rc5t583 *rc5t583; | |
22 | }; | |
23 | ||
e9fe32bc LD |
24 | static int rc5t583_gpio_get(struct gpio_chip *gc, unsigned int offset) |
25 | { | |
d660c68e | 26 | struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); |
e9fe32bc LD |
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 | ||
38 | static void rc5t583_gpio_set(struct gpio_chip *gc, unsigned int offset, int val) | |
39 | { | |
d660c68e | 40 | struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); |
e9fe32bc LD |
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 | ||
48 | static int rc5t583_gpio_dir_input(struct gpio_chip *gc, unsigned int offset) | |
49 | { | |
d660c68e | 50 | struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); |
e9fe32bc LD |
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 | ||
62 | static int rc5t583_gpio_dir_output(struct gpio_chip *gc, unsigned offset, | |
63 | int value) | |
64 | { | |
d660c68e | 65 | struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); |
e9fe32bc LD |
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 | ||
78 | static int rc5t583_gpio_to_irq(struct gpio_chip *gc, unsigned offset) | |
79 | { | |
d660c68e | 80 | struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); |
e9fe32bc | 81 | |
3bde4d26 | 82 | if (offset < RC5T583_MAX_GPIO) |
e9fe32bc LD |
83 | return rc5t583_gpio->rc5t583->irq_base + |
84 | RC5T583_IRQ_GPIO0 + offset; | |
85 | return -EINVAL; | |
86 | } | |
87 | ||
88 | static void rc5t583_gpio_free(struct gpio_chip *gc, unsigned offset) | |
89 | { | |
d660c68e | 90 | struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); |
e9fe32bc LD |
91 | struct device *parent = rc5t583_gpio->rc5t583->dev; |
92 | ||
93 | rc5t583_set_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset)); | |
94 | } | |
95 | ||
3836309d | 96 | static int rc5t583_gpio_probe(struct platform_device *pdev) |
e9fe32bc LD |
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); | |
4b7dfd7f | 104 | if (!rc5t583_gpio) |
e9fe32bc | 105 | return -ENOMEM; |
e9fe32bc LD |
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, | |
9fb1f39e | 116 | rc5t583_gpio->gpio_chip.can_sleep = true, |
58383c78 | 117 | rc5t583_gpio->gpio_chip.parent = &pdev->dev; |
e9fe32bc LD |
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 | platform_set_drvdata(pdev, rc5t583_gpio); | |
125 | ||
bc72f7f7 LD |
126 | return devm_gpiochip_add_data(&pdev->dev, &rc5t583_gpio->gpio_chip, |
127 | rc5t583_gpio); | |
e9fe32bc LD |
128 | } |
129 | ||
130 | static struct platform_driver rc5t583_gpio_driver = { | |
131 | .driver = { | |
132 | .name = "rc5t583-gpio", | |
e9fe32bc LD |
133 | }, |
134 | .probe = rc5t583_gpio_probe, | |
e9fe32bc LD |
135 | }; |
136 | ||
137 | static int __init rc5t583_gpio_init(void) | |
138 | { | |
139 | return platform_driver_register(&rc5t583_gpio_driver); | |
140 | } | |
141 | subsys_initcall(rc5t583_gpio_init); |