1/*
2 * Copyright 2011 Texas Instruments Inc.
3 *
4 * Author: Margarita Olaya <magi@slimlogic.co.uk>
5 *
6 *  This program is free software; you can redistribute it and/or modify it
7 *  under  the terms of the GNU General  Public License as published by the
8 *  Free Software Foundation;  either version 2 of the License, or (at your
9 *  option) any later version.
10 *
11 * This driver is based on wm8350 implementation.
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/errno.h>
17#include <linux/gpio.h>
18#include <linux/mfd/core.h>
19#include <linux/platform_device.h>
20#include <linux/seq_file.h>
21#include <linux/slab.h>
22#include <linux/mfd/tps65912.h>
23
24struct tps65912_gpio_data {
25	struct tps65912 *tps65912;
26	struct gpio_chip gpio_chip;
27};
28
29#define to_tgd(gc) container_of(gc, struct tps65912_gpio_data, gpio_chip)
30
31static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
32{
33	struct tps65912_gpio_data *tps65912_gpio = to_tgd(gc);
34	struct tps65912 *tps65912 = tps65912_gpio->tps65912;
35	int val;
36
37	val = tps65912_reg_read(tps65912, TPS65912_GPIO1 + offset);
38
39	if (val & GPIO_STS_MASK)
40		return 1;
41
42	return 0;
43}
44
45static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset,
46			      int value)
47{
48	struct tps65912_gpio_data *tps65912_gpio = to_tgd(gc);
49	struct tps65912 *tps65912 = tps65912_gpio->tps65912;
50
51	if (value)
52		tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset,
53							GPIO_SET_MASK);
54	else
55		tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset,
56								GPIO_SET_MASK);
57}
58
59static int tps65912_gpio_output(struct gpio_chip *gc, unsigned offset,
60				int value)
61{
62	struct tps65912_gpio_data *tps65912_gpio = to_tgd(gc);
63	struct tps65912 *tps65912 = tps65912_gpio->tps65912;
64
65	/* Set the initial value */
66	tps65912_gpio_set(gc, offset, value);
67
68	return tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset,
69								GPIO_CFG_MASK);
70}
71
72static int tps65912_gpio_input(struct gpio_chip *gc, unsigned offset)
73{
74	struct tps65912_gpio_data *tps65912_gpio = to_tgd(gc);
75	struct tps65912 *tps65912 = tps65912_gpio->tps65912;
76
77	return tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset,
78								GPIO_CFG_MASK);
79}
80
81static struct gpio_chip template_chip = {
82	.label			= "tps65912",
83	.owner			= THIS_MODULE,
84	.direction_input	= tps65912_gpio_input,
85	.direction_output	= tps65912_gpio_output,
86	.get			= tps65912_gpio_get,
87	.set			= tps65912_gpio_set,
88	.can_sleep		= true,
89	.ngpio			= 5,
90	.base			= -1,
91};
92
93static int tps65912_gpio_probe(struct platform_device *pdev)
94{
95	struct tps65912 *tps65912 = dev_get_drvdata(pdev->dev.parent);
96	struct tps65912_board *pdata = dev_get_platdata(tps65912->dev);
97	struct tps65912_gpio_data *tps65912_gpio;
98	int ret;
99
100	tps65912_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65912_gpio),
101				     GFP_KERNEL);
102	if (tps65912_gpio == NULL)
103		return -ENOMEM;
104
105	tps65912_gpio->tps65912 = tps65912;
106	tps65912_gpio->gpio_chip = template_chip;
107	tps65912_gpio->gpio_chip.dev = &pdev->dev;
108	if (pdata && pdata->gpio_base)
109		tps65912_gpio->gpio_chip.base = pdata->gpio_base;
110
111	ret = gpiochip_add(&tps65912_gpio->gpio_chip);
112	if (ret < 0) {
113		dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
114		return ret;
115	}
116
117	platform_set_drvdata(pdev, tps65912_gpio);
118
119	return ret;
120}
121
122static int tps65912_gpio_remove(struct platform_device *pdev)
123{
124	struct tps65912_gpio_data  *tps65912_gpio = platform_get_drvdata(pdev);
125
126	gpiochip_remove(&tps65912_gpio->gpio_chip);
127	return 0;
128}
129
130static struct platform_driver tps65912_gpio_driver = {
131	.driver = {
132		.name = "tps65912-gpio",
133	},
134	.probe = tps65912_gpio_probe,
135	.remove = tps65912_gpio_remove,
136};
137
138static int __init tps65912_gpio_init(void)
139{
140	return platform_driver_register(&tps65912_gpio_driver);
141}
142subsys_initcall(tps65912_gpio_init);
143
144static void __exit tps65912_gpio_exit(void)
145{
146	platform_driver_unregister(&tps65912_gpio_driver);
147}
148module_exit(tps65912_gpio_exit);
149
150MODULE_AUTHOR("Margarita Olaya Cabrera <magi@slimlogic.co.uk>");
151MODULE_DESCRIPTION("GPIO interface for TPS65912 PMICs");
152MODULE_LICENSE("GPL v2");
153MODULE_ALIAS("platform:tps65912-gpio");
154