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 | |
19 | struct rc5t583_gpio { |
20 | struct gpio_chip gpio_chip; |
21 | struct rc5t583 *rc5t583; |
22 | }; |
23 | |
24 | static 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(dev: parent, RC5T583_GPIO_MON_IOIN, val: &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 | { |
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(dev: parent, RC5T583_GPIO_IOOUT, BIT(offset)); |
44 | else |
45 | rc5t583_clear_bits(dev: parent, RC5T583_GPIO_IOOUT, BIT(offset)); |
46 | } |
47 | |
48 | static 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(dev: 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(dev: 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 | { |
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, val: value); |
70 | ret = rc5t583_set_bits(dev: 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(dev: parent, RC5T583_GPIO_PGSEL, BIT(offset)); |
76 | } |
77 | |
78 | static 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 | |
88 | static 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(dev: parent, RC5T583_GPIO_PGSEL, BIT(offset)); |
94 | } |
95 | |
96 | static int rc5t583_gpio_probe(struct platform_device *pdev) |
97 | { |
98 | struct rc5t583 *rc5t583 = dev_get_drvdata(dev: pdev->dev.parent); |
99 | struct rc5t583_platform_data *pdata = dev_get_platdata(dev: rc5t583->dev); |
100 | struct rc5t583_gpio *rc5t583_gpio; |
101 | |
102 | rc5t583_gpio = devm_kzalloc(dev: &pdev->dev, size: 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 | |
128 | static struct platform_driver rc5t583_gpio_driver = { |
129 | .driver = { |
130 | .name = "rc5t583-gpio" , |
131 | }, |
132 | .probe = rc5t583_gpio_probe, |
133 | }; |
134 | |
135 | static int __init rc5t583_gpio_init(void) |
136 | { |
137 | return platform_driver_register(&rc5t583_gpio_driver); |
138 | } |
139 | subsys_initcall(rc5t583_gpio_init); |
140 | |