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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * gpiolib support for Wolfson WM835x PMICs
4 *
5 * Copyright 2009 Wolfson Microelectronics PLC.
6 *
7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 *
9 */
10
11#include <linux/gpio/driver.h>
12#include <linux/kernel.h>
13#include <linux/mfd/core.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/slab.h>
17
18#include <linux/mfd/wm8350/core.h>
19#include <linux/mfd/wm8350/gpio.h>
20
21struct wm8350_gpio_data {
22 struct wm8350 *wm8350;
23 struct gpio_chip gpio_chip;
24};
25
26static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
27{
28 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
29 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
30
31 return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
32 1 << offset);
33}
34
35static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset)
36{
37 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
38 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
39 int ret;
40
41 ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL);
42 if (ret < 0)
43 return ret;
44
45 if (ret & (1 << offset))
46 return 1;
47 else
48 return 0;
49}
50
51static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
52{
53 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
54 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
55
56 if (value)
57 wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
58 else
59 wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
60}
61
62static int wm8350_gpio_direction_out(struct gpio_chip *chip,
63 unsigned offset, int value)
64{
65 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
66 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
67 int ret;
68
69 ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
70 1 << offset);
71 if (ret < 0)
72 return ret;
73
74 /* Don't have an atomic direction/value setup */
75 wm8350_gpio_set(chip, offset, value);
76
77 return 0;
78}
79
80static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
81{
82 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
83 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
84
85 if (!wm8350->irq_base)
86 return -EINVAL;
87
88 return wm8350->irq_base + WM8350_IRQ_GPIO(offset);
89}
90
91static const struct gpio_chip template_chip = {
92 .label = "wm8350",
93 .owner = THIS_MODULE,
94 .direction_input = wm8350_gpio_direction_in,
95 .get = wm8350_gpio_get,
96 .direction_output = wm8350_gpio_direction_out,
97 .set = wm8350_gpio_set,
98 .to_irq = wm8350_gpio_to_irq,
99 .can_sleep = true,
100};
101
102static int wm8350_gpio_probe(struct platform_device *pdev)
103{
104 struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent);
105 struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev);
106 struct wm8350_gpio_data *wm8350_gpio;
107
108 wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio),
109 GFP_KERNEL);
110 if (wm8350_gpio == NULL)
111 return -ENOMEM;
112
113 wm8350_gpio->wm8350 = wm8350;
114 wm8350_gpio->gpio_chip = template_chip;
115 wm8350_gpio->gpio_chip.ngpio = 13;
116 wm8350_gpio->gpio_chip.parent = &pdev->dev;
117 if (pdata && pdata->gpio_base)
118 wm8350_gpio->gpio_chip.base = pdata->gpio_base;
119 else
120 wm8350_gpio->gpio_chip.base = -1;
121
122 return devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip, wm8350_gpio);
123}
124
125static struct platform_driver wm8350_gpio_driver = {
126 .driver.name = "wm8350-gpio",
127 .probe = wm8350_gpio_probe,
128};
129
130static int __init wm8350_gpio_init(void)
131{
132 return platform_driver_register(&wm8350_gpio_driver);
133}
134subsys_initcall(wm8350_gpio_init);
135
136static void __exit wm8350_gpio_exit(void)
137{
138 platform_driver_unregister(&wm8350_gpio_driver);
139}
140module_exit(wm8350_gpio_exit);
141
142MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
143MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
144MODULE_LICENSE("GPL");
145MODULE_ALIAS("platform:wm8350-gpio");
1/*
2 * gpiolib support for Wolfson WM835x PMICs
3 *
4 * Copyright 2009 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 */
14
15#include <linux/kernel.h>
16#include <linux/slab.h>
17#include <linux/module.h>
18#include <linux/gpio.h>
19#include <linux/mfd/core.h>
20#include <linux/platform_device.h>
21#include <linux/seq_file.h>
22
23#include <linux/mfd/wm8350/core.h>
24#include <linux/mfd/wm8350/gpio.h>
25
26struct wm8350_gpio_data {
27 struct wm8350 *wm8350;
28 struct gpio_chip gpio_chip;
29};
30
31static inline struct wm8350_gpio_data *to_wm8350_gpio(struct gpio_chip *chip)
32{
33 return container_of(chip, struct wm8350_gpio_data, gpio_chip);
34}
35
36static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
37{
38 struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
39 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
40
41 return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
42 1 << offset);
43}
44
45static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset)
46{
47 struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
48 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
49 int ret;
50
51 ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL);
52 if (ret < 0)
53 return ret;
54
55 if (ret & (1 << offset))
56 return 1;
57 else
58 return 0;
59}
60
61static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
62{
63 struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
64 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
65
66 if (value)
67 wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
68 else
69 wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
70}
71
72static int wm8350_gpio_direction_out(struct gpio_chip *chip,
73 unsigned offset, int value)
74{
75 struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
76 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
77 int ret;
78
79 ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
80 1 << offset);
81 if (ret < 0)
82 return ret;
83
84 /* Don't have an atomic direction/value setup */
85 wm8350_gpio_set(chip, offset, value);
86
87 return 0;
88}
89
90static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
91{
92 struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
93 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
94
95 if (!wm8350->irq_base)
96 return -EINVAL;
97
98 return wm8350->irq_base + WM8350_IRQ_GPIO(offset);
99}
100
101static struct gpio_chip template_chip = {
102 .label = "wm8350",
103 .owner = THIS_MODULE,
104 .direction_input = wm8350_gpio_direction_in,
105 .get = wm8350_gpio_get,
106 .direction_output = wm8350_gpio_direction_out,
107 .set = wm8350_gpio_set,
108 .to_irq = wm8350_gpio_to_irq,
109 .can_sleep = true,
110};
111
112static int wm8350_gpio_probe(struct platform_device *pdev)
113{
114 struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent);
115 struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev);
116 struct wm8350_gpio_data *wm8350_gpio;
117 int ret;
118
119 wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio),
120 GFP_KERNEL);
121 if (wm8350_gpio == NULL)
122 return -ENOMEM;
123
124 wm8350_gpio->wm8350 = wm8350;
125 wm8350_gpio->gpio_chip = template_chip;
126 wm8350_gpio->gpio_chip.ngpio = 13;
127 wm8350_gpio->gpio_chip.dev = &pdev->dev;
128 if (pdata && pdata->gpio_base)
129 wm8350_gpio->gpio_chip.base = pdata->gpio_base;
130 else
131 wm8350_gpio->gpio_chip.base = -1;
132
133 ret = gpiochip_add(&wm8350_gpio->gpio_chip);
134 if (ret < 0) {
135 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
136 return ret;
137 }
138
139 platform_set_drvdata(pdev, wm8350_gpio);
140
141 return ret;
142}
143
144static int wm8350_gpio_remove(struct platform_device *pdev)
145{
146 struct wm8350_gpio_data *wm8350_gpio = platform_get_drvdata(pdev);
147
148 return gpiochip_remove(&wm8350_gpio->gpio_chip);
149}
150
151static struct platform_driver wm8350_gpio_driver = {
152 .driver.name = "wm8350-gpio",
153 .driver.owner = THIS_MODULE,
154 .probe = wm8350_gpio_probe,
155 .remove = wm8350_gpio_remove,
156};
157
158static int __init wm8350_gpio_init(void)
159{
160 return platform_driver_register(&wm8350_gpio_driver);
161}
162subsys_initcall(wm8350_gpio_init);
163
164static void __exit wm8350_gpio_exit(void)
165{
166 platform_driver_unregister(&wm8350_gpio_driver);
167}
168module_exit(wm8350_gpio_exit);
169
170MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
171MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
172MODULE_LICENSE("GPL");
173MODULE_ALIAS("platform:wm8350-gpio");