1/*
2 * TI TPS6591x GPIO driver
3 *
4 * Copyright 2010 Texas Instruments Inc.
5 *
6 * Author: Graeme Gregory <gg@slimlogic.co.uk>
7 * Author: Jorge Eduardo Candelaria jedu@slimlogic.co.uk>
8 *
9 *  This program is free software; you can redistribute it and/or modify it
10 *  under  the terms of the GNU General  Public License as published by the
11 *  Free Software Foundation;  either version 2 of the License, or (at your
12 *  option) any later version.
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/errno.h>
19#include <linux/gpio.h>
20#include <linux/i2c.h>
21#include <linux/platform_device.h>
22#include <linux/mfd/tps65910.h>
23#include <linux/of_device.h>
24
25struct tps65910_gpio {
26	struct gpio_chip gpio_chip;
27	struct tps65910 *tps65910;
28};
29
30static inline struct tps65910_gpio *to_tps65910_gpio(struct gpio_chip *chip)
31{
32	return container_of(chip, struct tps65910_gpio, gpio_chip);
33}
34
35static int tps65910_gpio_get(struct gpio_chip *gc, unsigned offset)
36{
37	struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
38	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
39	unsigned int val;
40
41	tps65910_reg_read(tps65910, TPS65910_GPIO0 + offset, &val);
42
43	if (val & GPIO_STS_MASK)
44		return 1;
45
46	return 0;
47}
48
49static void tps65910_gpio_set(struct gpio_chip *gc, unsigned offset,
50			      int value)
51{
52	struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
53	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
54
55	if (value)
56		tps65910_reg_set_bits(tps65910, TPS65910_GPIO0 + offset,
57						GPIO_SET_MASK);
58	else
59		tps65910_reg_clear_bits(tps65910, TPS65910_GPIO0 + offset,
60						GPIO_SET_MASK);
61}
62
63static int tps65910_gpio_output(struct gpio_chip *gc, unsigned offset,
64				int value)
65{
66	struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
67	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
68
69	/* Set the initial value */
70	tps65910_gpio_set(gc, offset, value);
71
72	return tps65910_reg_set_bits(tps65910, TPS65910_GPIO0 + offset,
73						GPIO_CFG_MASK);
74}
75
76static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)
77{
78	struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
79	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
80
81	return tps65910_reg_clear_bits(tps65910, TPS65910_GPIO0 + offset,
82						GPIO_CFG_MASK);
83}
84
85#ifdef CONFIG_OF
86static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
87		struct tps65910 *tps65910, int chip_ngpio)
88{
89	struct tps65910_board *tps65910_board = tps65910->of_plat_data;
90	unsigned int prop_array[TPS6591X_MAX_NUM_GPIO];
91	int ngpio = min(chip_ngpio, TPS6591X_MAX_NUM_GPIO);
92	int ret;
93	int idx;
94
95	tps65910_board->gpio_base = -1;
96	ret = of_property_read_u32_array(tps65910->dev->of_node,
97			"ti,en-gpio-sleep", prop_array, ngpio);
98	if (ret < 0) {
99		dev_dbg(dev, "ti,en-gpio-sleep not specified\n");
100		return tps65910_board;
101	}
102
103	for (idx = 0; idx < ngpio; idx++)
104		tps65910_board->en_gpio_sleep[idx] = (prop_array[idx] != 0);
105
106	return tps65910_board;
107}
108#else
109static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
110		struct tps65910 *tps65910, int chip_ngpio)
111{
112	return NULL;
113}
114#endif
115
116static int tps65910_gpio_probe(struct platform_device *pdev)
117{
118	struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent);
119	struct tps65910_board *pdata = dev_get_platdata(tps65910->dev);
120	struct tps65910_gpio *tps65910_gpio;
121	int ret;
122	int i;
123
124	tps65910_gpio = devm_kzalloc(&pdev->dev,
125				sizeof(*tps65910_gpio), GFP_KERNEL);
126	if (!tps65910_gpio)
127		return -ENOMEM;
128
129	tps65910_gpio->tps65910 = tps65910;
130
131	tps65910_gpio->gpio_chip.owner = THIS_MODULE;
132	tps65910_gpio->gpio_chip.label = tps65910->i2c_client->name;
133
134	switch (tps65910_chip_id(tps65910)) {
135	case TPS65910:
136		tps65910_gpio->gpio_chip.ngpio = TPS65910_NUM_GPIO;
137		break;
138	case TPS65911:
139		tps65910_gpio->gpio_chip.ngpio = TPS65911_NUM_GPIO;
140		break;
141	default:
142		return -EINVAL;
143	}
144	tps65910_gpio->gpio_chip.can_sleep = true;
145	tps65910_gpio->gpio_chip.direction_input = tps65910_gpio_input;
146	tps65910_gpio->gpio_chip.direction_output = tps65910_gpio_output;
147	tps65910_gpio->gpio_chip.set	= tps65910_gpio_set;
148	tps65910_gpio->gpio_chip.get	= tps65910_gpio_get;
149	tps65910_gpio->gpio_chip.dev = &pdev->dev;
150#ifdef CONFIG_OF_GPIO
151	tps65910_gpio->gpio_chip.of_node = tps65910->dev->of_node;
152#endif
153	if (pdata && pdata->gpio_base)
154		tps65910_gpio->gpio_chip.base = pdata->gpio_base;
155	else
156		tps65910_gpio->gpio_chip.base = -1;
157
158	if (!pdata && tps65910->dev->of_node)
159		pdata = tps65910_parse_dt_for_gpio(&pdev->dev, tps65910,
160			tps65910_gpio->gpio_chip.ngpio);
161
162	if (!pdata)
163		goto skip_init;
164
165	/* Configure sleep control for gpios if provided */
166	for (i = 0; i < tps65910_gpio->gpio_chip.ngpio; ++i) {
167		if (!pdata->en_gpio_sleep[i])
168			continue;
169
170		ret = tps65910_reg_set_bits(tps65910,
171			TPS65910_GPIO0 + i, GPIO_SLEEP_MASK);
172		if (ret < 0)
173			dev_warn(tps65910->dev,
174				"GPIO Sleep setting failed with err %d\n", ret);
175	}
176
177skip_init:
178	ret = gpiochip_add(&tps65910_gpio->gpio_chip);
179	if (ret < 0) {
180		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
181		return ret;
182	}
183
184	platform_set_drvdata(pdev, tps65910_gpio);
185
186	return ret;
187}
188
189static int tps65910_gpio_remove(struct platform_device *pdev)
190{
191	struct tps65910_gpio *tps65910_gpio = platform_get_drvdata(pdev);
192
193	gpiochip_remove(&tps65910_gpio->gpio_chip);
194	return 0;
195}
196
197static struct platform_driver tps65910_gpio_driver = {
198	.driver.name    = "tps65910-gpio",
199	.driver.owner   = THIS_MODULE,
200	.probe		= tps65910_gpio_probe,
201	.remove		= tps65910_gpio_remove,
202};
203
204static int __init tps65910_gpio_init(void)
205{
206	return platform_driver_register(&tps65910_gpio_driver);
207}
208subsys_initcall(tps65910_gpio_init);
209
210static void __exit tps65910_gpio_exit(void)
211{
212	platform_driver_unregister(&tps65910_gpio_driver);
213}
214module_exit(tps65910_gpio_exit);
215
216MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
217MODULE_AUTHOR("Jorge Eduardo Candelaria jedu@slimlogic.co.uk>");
218MODULE_DESCRIPTION("GPIO interface for TPS65910/TPS6511 PMICs");
219MODULE_LICENSE("GPL v2");
220MODULE_ALIAS("platform:tps65910-gpio");
221