aboutsummaryrefslogtreecommitdiff
path: root/drivers/gpio/gpio-tps65910.c
blob: c1ad2884f2edb0b79f3894a9a16662e5776bda51 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
/*
 * TI TPS6591x GPIO driver
 *
 * Copyright 2010 Texas Instruments Inc.
 *
 * Author: Graeme Gregory <gg@slimlogic.co.uk>
 * Author: Jorge Eduardo Candelaria jedu@slimlogic.co.uk>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under  the terms of the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the License, or (at your
 *  option) any later version.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/mfd/tps65910.h>
#include <linux/of_device.h>

struct tps65910_gpio {
	struct gpio_chip gpio_chip;
	struct tps65910 *tps65910;
};

static inline struct tps65910_gpio *to_tps65910_gpio(struct gpio_chip *chip)
{
	return container_of(chip, struct tps65910_gpio, gpio_chip);
}

static int tps65910_gpio_get(struct gpio_chip *gc, unsigned offset)
{
	struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
	struct tps65910 *tps65910 = tps65910_gpio->tps65910;
	unsigned int val;

	tps65910_reg_read(tps65910, TPS65910_GPIO0 + offset, &val);

	if (val & GPIO_STS_MASK)
		return 1;

	return 0;
}

static void tps65910_gpio_set(struct gpio_chip *gc, unsigned offset,
			      int value)
{
	struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
	struct tps65910 *tps65910 = tps65910_gpio->tps65910;

	if (value)
		tps65910_reg_set_bits(tps65910, TPS65910_GPIO0 + offset,
						GPIO_SET_MASK);
	else
		tps65910_reg_clear_bits(tps65910, TPS65910_GPIO0 + offset,
						GPIO_SET_MASK);
}

static int tps65910_gpio_output(struct gpio_chip *gc, unsigned offset,
				int value)
{
	struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
	struct tps65910 *tps65910 = tps65910_gpio->tps65910;

	/* Set the initial value */
	tps65910_gpio_set(gc, offset, value);

	return tps65910_reg_set_bits(tps65910, TPS65910_GPIO0 + offset,
						GPIO_CFG_MASK);
}

static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)
{
	struct tps65910_gpio *tps65910_gpio = to_tps65910_gpio(gc);
	struct tps65910 *tps65910 = tps65910_gpio->tps65910;

	return tps65910_reg_clear_bits(tps65910, TPS65910_GPIO0 + offset,
						GPIO_CFG_MASK);
}

#ifdef CONFIG_OF
static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
		struct tps65910 *tps65910, int chip_ngpio)
{
	struct tps65910_board *tps65910_board = tps65910->of_plat_data;
	unsigned int prop_array[TPS6591X_MAX_NUM_GPIO];
	int ngpio = min(chip_ngpio, TPS6591X_MAX_NUM_GPIO);
	int ret;
	int idx;

	tps65910_board->gpio_base = -1;
	ret = of_property_read_u32_array(tps65910->dev->of_node,
			"ti,en-gpio-sleep", prop_array, ngpio);
	if (ret < 0) {
		dev_dbg(dev, "ti,en-gpio-sleep not specified\n");
		return tps65910_board;
	}

	for (idx = 0; idx < ngpio; idx++)
		tps65910_board->en_gpio_sleep[idx] = (prop_array[idx] != 0);

	return tps65910_board;
}
#else
static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev,
		struct tps65910 *tps65910, int chip_ngpio)
{
	return NULL;
}
#endif

static int __devinit tps65910_gpio_probe(struct platform_device *pdev)
{
	struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent);
	struct tps65910_board *pdata = dev_get_platdata(tps65910->dev);
	struct tps65910_gpio *tps65910_gpio;
	int ret;
	int i;

	tps65910_gpio = devm_kzalloc(&pdev->dev,
				sizeof(*tps65910_gpio), GFP_KERNEL);
	if (!tps65910_gpio) {
		dev_err(&pdev->dev, "Could not allocate tps65910_gpio\n");
		return -ENOMEM;
	}

	tps65910_gpio->tps65910 = tps65910;

	tps65910_gpio->gpio_chip.owner = THIS_MODULE;
	tps65910_gpio->gpio_chip.label = tps65910->i2c_client->name;

	switch(tps65910_chip_id(tps65910)) {
	case TPS65910:
		tps65910_gpio->gpio_chip.ngpio = TPS65910_NUM_GPIO;
		break;
	case TPS65911:
		tps65910_gpio->gpio_chip.ngpio = TPS65911_NUM_GPIO;
		break;
	default:
		return -EINVAL;
	}
	tps65910_gpio->gpio_chip.can_sleep = 1;
	tps65910_gpio->gpio_chip.direction_input = tps65910_gpio_input;
	tps65910_gpio->gpio_chip.direction_output = tps65910_gpio_output;
	tps65910_gpio->gpio_chip.set	= tps65910_gpio_set;
	tps65910_gpio->gpio_chip.get	= tps65910_gpio_get;
	tps65910_gpio->gpio_chip.dev = &pdev->dev;
	if (pdata && pdata->gpio_base)
		tps65910_gpio->gpio_chip.base = pdata->gpio_base;
	else
		tps65910_gpio->gpio_chip.base = -1;

	if (!pdata && tps65910->dev->of_node)
		pdata = tps65910_parse_dt_for_gpio(&pdev->dev, tps65910,
			tps65910_gpio->gpio_chip.ngpio);

	if (!pdata)
		goto skip_init;

	/* Configure sleep control for gpios if provided */
	for (i = 0; i < tps65910_gpio->gpio_chip.ngpio; ++i) {
		if (!pdata->en_gpio_sleep[i])
			continue;

		ret = tps65910_reg_set_bits(tps65910,
			TPS65910_GPIO0 + i, GPIO_SLEEP_MASK);
		if (ret < 0)
			dev_warn(tps65910->dev,
				"GPIO Sleep setting failed with err %d\n", ret);
	}

skip_init:
	ret = gpiochip_add(&tps65910_gpio->gpio_chip);
	if (ret < 0) {
		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
		return ret;
	}

	platform_set_drvdata(pdev, tps65910_gpio);

	return ret;
}

static int __devexit tps65910_gpio_remove(struct platform_device *pdev)
{
	struct tps65910_gpio *tps65910_gpio = platform_get_drvdata(pdev);

	return gpiochip_remove(&tps65910_gpio->gpio_chip);
}

static struct platform_driver tps65910_gpio_driver = {
	.driver.name    = "tps65910-gpio",
	.driver.owner   = THIS_MODULE,
	.probe		= tps65910_gpio_probe,
	.remove		= __devexit_p(tps65910_gpio_remove),
};

static int __init tps65910_gpio_init(void)
{
	return platform_driver_register(&tps65910_gpio_driver);
}
subsys_initcall(tps65910_gpio_init);

static void __exit tps65910_gpio_exit(void)
{
	platform_driver_unregister(&tps65910_gpio_driver);
}
module_exit(tps65910_gpio_exit);

MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
MODULE_AUTHOR("Jorge Eduardo Candelaria jedu@slimlogic.co.uk>");
MODULE_DESCRIPTION("GPIO interface for TPS65910/TPS6511 PMICs");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tps65910-gpio");