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Mark Brown38f6ce42010-01-07 16:10:08 +00001/*
Grant Likelyc103de22011-06-04 18:38:28 -06002 * gpiolib support for Wolfson WM835x PMICs
Mark Brown38f6ce42010-01-07 16:10:08 +00003 *
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/slab.h>
Mark Brown38f6ce42010-01-07 16:10:08 +000017#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
Mark Brown38f6ce42010-01-07 16:10:08 +000031static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
32{
Linus Walleijdfcdf722015-12-07 15:13:39 +010033 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
Mark Brown38f6ce42010-01-07 16:10:08 +000034 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
35
36 return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
37 1 << offset);
38}
39
40static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset)
41{
Linus Walleijdfcdf722015-12-07 15:13:39 +010042 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
Mark Brown38f6ce42010-01-07 16:10:08 +000043 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
44 int ret;
45
46 ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL);
47 if (ret < 0)
48 return ret;
49
50 if (ret & (1 << offset))
51 return 1;
52 else
53 return 0;
54}
55
56static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
57{
Linus Walleijdfcdf722015-12-07 15:13:39 +010058 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
Mark Brown38f6ce42010-01-07 16:10:08 +000059 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
60
61 if (value)
62 wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
63 else
64 wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
65}
66
67static int wm8350_gpio_direction_out(struct gpio_chip *chip,
68 unsigned offset, int value)
69{
Linus Walleijdfcdf722015-12-07 15:13:39 +010070 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
Mark Brown38f6ce42010-01-07 16:10:08 +000071 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
72 int ret;
73
74 ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
75 1 << offset);
76 if (ret < 0)
77 return ret;
78
79 /* Don't have an atomic direction/value setup */
80 wm8350_gpio_set(chip, offset, value);
81
82 return 0;
83}
84
85static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
86{
Linus Walleijdfcdf722015-12-07 15:13:39 +010087 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
Mark Brown38f6ce42010-01-07 16:10:08 +000088 struct wm8350 *wm8350 = wm8350_gpio->wm8350;
89
90 if (!wm8350->irq_base)
91 return -EINVAL;
92
93 return wm8350->irq_base + WM8350_IRQ_GPIO(offset);
94}
95
96static struct gpio_chip template_chip = {
97 .label = "wm8350",
98 .owner = THIS_MODULE,
99 .direction_input = wm8350_gpio_direction_in,
100 .get = wm8350_gpio_get,
101 .direction_output = wm8350_gpio_direction_out,
102 .set = wm8350_gpio_set,
103 .to_irq = wm8350_gpio_to_irq,
Linus Walleij9fb1f392013-12-04 14:42:46 +0100104 .can_sleep = true,
Mark Brown38f6ce42010-01-07 16:10:08 +0000105};
106
Bill Pemberton38363092012-11-19 13:22:34 -0500107static int wm8350_gpio_probe(struct platform_device *pdev)
Mark Brown38f6ce42010-01-07 16:10:08 +0000108{
109 struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent);
Jingoo Hane56aee12013-07-30 17:08:05 +0900110 struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev);
Mark Brown38f6ce42010-01-07 16:10:08 +0000111 struct wm8350_gpio_data *wm8350_gpio;
112 int ret;
113
Axel Lin5b425432012-09-02 11:58:59 +0800114 wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio),
115 GFP_KERNEL);
Mark Brown38f6ce42010-01-07 16:10:08 +0000116 if (wm8350_gpio == NULL)
117 return -ENOMEM;
118
119 wm8350_gpio->wm8350 = wm8350;
120 wm8350_gpio->gpio_chip = template_chip;
121 wm8350_gpio->gpio_chip.ngpio = 13;
Linus Walleij58383c72015-11-04 09:56:26 +0100122 wm8350_gpio->gpio_chip.parent = &pdev->dev;
Mark Brown38f6ce42010-01-07 16:10:08 +0000123 if (pdata && pdata->gpio_base)
124 wm8350_gpio->gpio_chip.base = pdata->gpio_base;
125 else
126 wm8350_gpio->gpio_chip.base = -1;
127
Laxman Dewangan4a4925c2016-02-22 17:43:28 +0530128 ret = devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip,
129 wm8350_gpio);
Mark Brown38f6ce42010-01-07 16:10:08 +0000130 if (ret < 0) {
Axel Lin5b425432012-09-02 11:58:59 +0800131 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
132 return ret;
Mark Brown38f6ce42010-01-07 16:10:08 +0000133 }
134
135 platform_set_drvdata(pdev, wm8350_gpio);
136
137 return ret;
Mark Brown38f6ce42010-01-07 16:10:08 +0000138}
139
Mark Brown38f6ce42010-01-07 16:10:08 +0000140static struct platform_driver wm8350_gpio_driver = {
141 .driver.name = "wm8350-gpio",
Mark Brown38f6ce42010-01-07 16:10:08 +0000142 .probe = wm8350_gpio_probe,
Mark Brown38f6ce42010-01-07 16:10:08 +0000143};
144
145static int __init wm8350_gpio_init(void)
146{
147 return platform_driver_register(&wm8350_gpio_driver);
148}
149subsys_initcall(wm8350_gpio_init);
150
151static void __exit wm8350_gpio_exit(void)
152{
153 platform_driver_unregister(&wm8350_gpio_driver);
154}
155module_exit(wm8350_gpio_exit);
156
157MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
158MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
159MODULE_LICENSE("GPL");
160MODULE_ALIAS("platform:wm8350-gpio");