GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / gpio / gpio-rc5t583.c
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(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 {
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(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 {
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(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 {
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, 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 {
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(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(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);
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         platform_set_drvdata(pdev, rc5t583_gpio);
125
126         return devm_gpiochip_add_data(&pdev->dev, &rc5t583_gpio->gpio_chip,
127                                       rc5t583_gpio);
128 }
129
130 static struct platform_driver rc5t583_gpio_driver = {
131         .driver = {
132                 .name    = "rc5t583-gpio",
133         },
134         .probe          = rc5t583_gpio_probe,
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);