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");
146