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
rc5t583_gpio_get(struct gpio_chip * gc,unsigned int offset)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(parent, RC5T583_GPIO_MON_IOIN, &val);
32 if (ret < 0)
33 return ret;
34
35 return !!(val & BIT(offset));
36 }
37
rc5t583_gpio_set(struct gpio_chip * gc,unsigned int offset,int val)38 static int 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 int ret;
43
44 if (val)
45 ret = rc5t583_set_bits(parent, RC5T583_GPIO_IOOUT,
46 BIT(offset));
47 else
48 ret = rc5t583_clear_bits(parent, RC5T583_GPIO_IOOUT,
49 BIT(offset));
50
51 return ret;
52 }
53
rc5t583_gpio_dir_input(struct gpio_chip * gc,unsigned int offset)54 static int rc5t583_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)
55 {
56 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
57 struct device *parent = rc5t583_gpio->rc5t583->dev;
58 int ret;
59
60 ret = rc5t583_clear_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
61 if (ret < 0)
62 return ret;
63
64 /* Set pin to gpio mode */
65 return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
66 }
67
rc5t583_gpio_dir_output(struct gpio_chip * gc,unsigned offset,int value)68 static int rc5t583_gpio_dir_output(struct gpio_chip *gc, unsigned offset,
69 int value)
70 {
71 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
72 struct device *parent = rc5t583_gpio->rc5t583->dev;
73 int ret;
74
75 ret = rc5t583_gpio_set(gc, offset, value);
76 if (ret)
77 return ret;
78
79 ret = rc5t583_set_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
80 if (ret < 0)
81 return ret;
82
83 /* Set pin to gpio mode */
84 return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
85 }
86
rc5t583_gpio_to_irq(struct gpio_chip * gc,unsigned offset)87 static int rc5t583_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
88 {
89 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
90
91 if (offset < RC5T583_MAX_GPIO)
92 return rc5t583_gpio->rc5t583->irq_base +
93 RC5T583_IRQ_GPIO0 + offset;
94 return -EINVAL;
95 }
96
rc5t583_gpio_free(struct gpio_chip * gc,unsigned offset)97 static void rc5t583_gpio_free(struct gpio_chip *gc, unsigned offset)
98 {
99 struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
100 struct device *parent = rc5t583_gpio->rc5t583->dev;
101
102 rc5t583_set_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
103 }
104
rc5t583_gpio_probe(struct platform_device * pdev)105 static int rc5t583_gpio_probe(struct platform_device *pdev)
106 {
107 struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
108 struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
109 struct rc5t583_gpio *rc5t583_gpio;
110
111 rc5t583_gpio = devm_kzalloc(&pdev->dev, sizeof(*rc5t583_gpio),
112 GFP_KERNEL);
113 if (!rc5t583_gpio)
114 return -ENOMEM;
115
116 rc5t583_gpio->gpio_chip.label = "gpio-rc5t583",
117 rc5t583_gpio->gpio_chip.owner = THIS_MODULE,
118 rc5t583_gpio->gpio_chip.free = rc5t583_gpio_free,
119 rc5t583_gpio->gpio_chip.direction_input = rc5t583_gpio_dir_input,
120 rc5t583_gpio->gpio_chip.direction_output = rc5t583_gpio_dir_output,
121 rc5t583_gpio->gpio_chip.set = rc5t583_gpio_set,
122 rc5t583_gpio->gpio_chip.get = rc5t583_gpio_get,
123 rc5t583_gpio->gpio_chip.to_irq = rc5t583_gpio_to_irq,
124 rc5t583_gpio->gpio_chip.ngpio = RC5T583_MAX_GPIO,
125 rc5t583_gpio->gpio_chip.can_sleep = true,
126 rc5t583_gpio->gpio_chip.parent = &pdev->dev;
127 rc5t583_gpio->gpio_chip.base = -1;
128 rc5t583_gpio->rc5t583 = rc5t583;
129
130 if (pdata && pdata->gpio_base)
131 rc5t583_gpio->gpio_chip.base = pdata->gpio_base;
132
133 return devm_gpiochip_add_data(&pdev->dev, &rc5t583_gpio->gpio_chip,
134 rc5t583_gpio);
135 }
136
137 static struct platform_driver rc5t583_gpio_driver = {
138 .driver = {
139 .name = "rc5t583-gpio",
140 },
141 .probe = rc5t583_gpio_probe,
142 };
143
rc5t583_gpio_init(void)144 static int __init rc5t583_gpio_init(void)
145 {
146 return platform_driver_register(&rc5t583_gpio_driver);
147 }
148 subsys_initcall(rc5t583_gpio_init);
149