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 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
rc5t583_gpio_dir_input(struct gpio_chip * gc,unsigned int offset)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
rc5t583_gpio_dir_output(struct gpio_chip * gc,unsigned offset,int value)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
rc5t583_gpio_to_irq(struct gpio_chip * gc,unsigned offset)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
rc5t583_gpio_free(struct gpio_chip * gc,unsigned offset)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
rc5t583_gpio_probe(struct platform_device * pdev)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 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
rc5t583_gpio_init(void)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