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	gpiochip_remove(&wm8350_gpio->gpio_chip);
149	return 0;
150}
151
152static struct platform_driver wm8350_gpio_driver = {
153	.driver.name	= "wm8350-gpio",
154	.driver.owner	= THIS_MODULE,
155	.probe		= wm8350_gpio_probe,
156	.remove		= wm8350_gpio_remove,
157};
158
159static int __init wm8350_gpio_init(void)
160{
161	return platform_driver_register(&wm8350_gpio_driver);
162}
163subsys_initcall(wm8350_gpio_init);
164
165static void __exit wm8350_gpio_exit(void)
166{
167	platform_driver_unregister(&wm8350_gpio_driver);
168}
169module_exit(wm8350_gpio_exit);
170
171MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
172MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
173MODULE_LICENSE("GPL");
174MODULE_ALIAS("platform:wm8350-gpio");
175