[linux-2.6-block.git] / drivers / gpio / gpio-tps65218.c

/*
 * Copyright 2015 Verifone Int.
 *
 * Author: Nicolas Saenz Julienne <nicolassaenzj@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify i t
 * under  the terms of the GNU General  Public License as published by th e
 * Free Software Foundation;  either version 2 of the License, or (at you r
 * option) any later version.
 *
 * This driver is based on the gpio-tps65912 implementation.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/gpio/driver.h>
#include <linux/platform_device.h>
#include <linux/mfd/tps65218.h>
#include "gpiolib.h"

struct tps65218_gpio {
	struct tps65218 *tps65218;
	struct gpio_chip gpio_chip;
};

static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset)
{
	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
	unsigned int val;
	int ret;

	ret = tps65218_reg_read(tps65218, TPS65218_REG_ENABLE2, &val);
	if (ret)
		return ret;

	return !!(val & (TPS65218_ENABLE2_GPIO1 << offset));
}

static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset,
			      int value)
{
	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	struct tps65218 *tps65218 = tps65218_gpio->tps65218;

	if (value)
		tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2,
				  TPS65218_ENABLE2_GPIO1 << offset,
				  TPS65218_ENABLE2_GPIO1 << offset,
				  TPS65218_PROTECT_L1);
	else
		tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2,
				    TPS65218_ENABLE2_GPIO1 << offset,
				    TPS65218_PROTECT_L1);
}

static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset,
				int value)
{
	/* Only drives GPOs */
	return 0;
}

static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset)
{
	return -EPERM;
}

static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset)
{
	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
	unsigned long flags = gc->desc[offset].flags;
	int ret;

	if (flags & FLAG_OPEN_SOURCE) {
		dev_err(gc->parent, "can't work as open source\n");
		return -EINVAL;
	}

	switch (offset) {
	case 0:
		if (!(flags & FLAG_OPEN_DRAIN)) {
			dev_err(gc->parent, "GPO1 works only as open drain\n");
			return -EINVAL;
		}

		/* Disable sequencer for GPO1 */
		ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
					  TPS65218_SEQ7_GPO1_SEQ_MASK,
					  TPS65218_PROTECT_L1);
		if (ret)
			return ret;

		/* Setup GPO1 */
		ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
					  TPS65218_CONFIG1_IO1_SEL,
					  TPS65218_PROTECT_L1);
		if (ret)
			return ret;

		break;
	case 1:
		/* GP02 is push-pull by default, can be set as open drain. */
		if (flags & FLAG_OPEN_DRAIN) {
			ret = tps65218_clear_bits(tps65218,
						  TPS65218_REG_CONFIG1,
						  TPS65218_CONFIG1_GPO2_BUF,
						  TPS65218_PROTECT_L1);
			if (ret)
				return ret;
		}

		/* Setup GPO2 */
		ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
					  TPS65218_CONFIG1_IO1_SEL,
					  TPS65218_PROTECT_L1);
		if (ret)
			return ret;

		break;

	case 2:
		if (!(flags & FLAG_OPEN_DRAIN)) {
			dev_err(gc->parent, "GPO3 works only as open drain\n");
			return -EINVAL;
		}

		/* Disable sequencer for GPO3 */
		ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
					  TPS65218_SEQ7_GPO3_SEQ_MASK,
					  TPS65218_PROTECT_L1);
		if (ret)
			return ret;

		/* Setup GPO3 */
		ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2,
					  TPS65218_CONFIG2_DC12_RST,
					  TPS65218_PROTECT_L1);
		if (ret)
			return ret;

		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static struct gpio_chip template_chip = {
	.label			= "gpio-tps65218",
	.owner			= THIS_MODULE,
	.request		= tps65218_gpio_request,
	.direction_output	= tps65218_gpio_output,
	.direction_input	= tps65218_gpio_input,
	.get			= tps65218_gpio_get,
	.set			= tps65218_gpio_set,
	.can_sleep		= true,
	.ngpio			= 3,
	.base			= -1,
};

static int tps65218_gpio_probe(struct platform_device *pdev)
{
	struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent);
	struct tps65218_gpio *tps65218_gpio;
	int ret;

	tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio),
				     GFP_KERNEL);
	if (!tps65218_gpio)
		return -ENOMEM;

	tps65218_gpio->tps65218 = tps65218;
	tps65218_gpio->gpio_chip = template_chip;
	tps65218_gpio->gpio_chip.parent = &pdev->dev;
#ifdef CONFIG_OF_GPIO
	tps65218_gpio->gpio_chip.of_node = pdev->dev.of_node;
#endif

	ret = gpiochip_add_data(&tps65218_gpio->gpio_chip, tps65218_gpio);
	if (ret < 0) {
		dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
		return ret;
	}

	platform_set_drvdata(pdev, tps65218_gpio);

	return ret;
}

static int tps65218_gpio_remove(struct platform_device *pdev)
{
	struct tps65218_gpio *tps65218_gpio = platform_get_drvdata(pdev);

	gpiochip_remove(&tps65218_gpio->gpio_chip);

	return 0;
}

static const struct of_device_id tps65218_dt_match[] = {
	{ .compatible = "ti,tps65218-gpio" },
	{  }
};
MODULE_DEVICE_TABLE(of, tps65218_dt_match);

static struct platform_driver tps65218_gpio_driver = {
	.driver = {
		.name = "tps65218-gpio",
		.of_match_table = of_match_ptr(tps65218_dt_match)
	},
	.probe = tps65218_gpio_probe,
	.remove = tps65218_gpio_remove,
};

module_platform_driver(tps65218_gpio_driver);

MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>");
MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tps65218-gpio");
Commit	Line	Data
c366c76a NSJ	1	/*
	2	* Copyright 2015 Verifone Int.
	3	*
	4	* Author: Nicolas Saenz Julienne <nicolassaenzj@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify i t
	7	* under the terms of the GNU General Public License as published by th e
	8	* Free Software Foundation; either version 2 of the License, or (at you r
	9	* option) any later version.
	10	*
	11	* This driver is based on the gpio-tps65912 implementation.
	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/errno.h>
	17	#include <linux/gpio/driver.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/mfd/tps65218.h>
	20	#include "gpiolib.h"
	21
	22	struct tps65218_gpio {
	23	struct tps65218 *tps65218;
	24	struct gpio_chip gpio_chip;
	25	};
	26
	27	static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset)
	28	{
	29	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	30	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
	31	unsigned int val;
	32	int ret;
	33
	34	ret = tps65218_reg_read(tps65218, TPS65218_REG_ENABLE2, &val);
	35	if (ret)
	36	return ret;
	37
	38	return !!(val & (TPS65218_ENABLE2_GPIO1 << offset));
	39	}
	40
	41	static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset,
	42	int value)
	43	{
	44	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
	45	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
	46
	47	if (value)
	48	tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2,
	49	TPS65218_ENABLE2_GPIO1 << offset,
	50	TPS65218_ENABLE2_GPIO1 << offset,
	51	TPS65218_PROTECT_L1);
	52	else
	53	tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2,
	54	TPS65218_ENABLE2_GPIO1 << offset,
	55	TPS65218_PROTECT_L1);
	56	}
	57
	58	static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset,
	59	int value)
	60	{
	61	/* Only drives GPOs */
	62	return 0;
	63	}
	64
65	static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset)
66	{
67	return -EPERM;
68	}
69
70	static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset)
71	{
72	struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
73	struct tps65218 *tps65218 = tps65218_gpio->tps65218;
74	unsigned long flags = gc->desc[offset].flags;
75	int ret;
76
77	if (flags & FLAG_OPEN_SOURCE) {
78	dev_err(gc->parent, "can't work as open source\n");
79	return -EINVAL;
80	}
81
82	switch (offset) {
83	case 0:
84	if (!(flags & FLAG_OPEN_DRAIN)) {
85	dev_err(gc->parent, "GPO1 works only as open drain\n");
86	return -EINVAL;
87	}
88
89	/* Disable sequencer for GPO1 */
90	ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
91	TPS65218_SEQ7_GPO1_SEQ_MASK,
92	TPS65218_PROTECT_L1);
93	if (ret)
94	return ret;
95
96	/* Setup GPO1 */
97	ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
98	TPS65218_CONFIG1_IO1_SEL,
99	TPS65218_PROTECT_L1);
100	if (ret)
101	return ret;
102
103	break;
104	case 1:
105	/* GP02 is push-pull by default, can be set as open drain. */
106	if (flags & FLAG_OPEN_DRAIN) {
107	ret = tps65218_clear_bits(tps65218,
108	TPS65218_REG_CONFIG1,
109	TPS65218_CONFIG1_GPO2_BUF,
110	TPS65218_PROTECT_L1);
111	if (ret)
112	return ret;
113	}
114
115	/* Setup GPO2 */
116	ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
117	TPS65218_CONFIG1_IO1_SEL,
118	TPS65218_PROTECT_L1);
119	if (ret)
120	return ret;
121
122	break;
123
124	case 2:
125	if (!(flags & FLAG_OPEN_DRAIN)) {
126	dev_err(gc->parent, "GPO3 works only as open drain\n");
127	return -EINVAL;
128	}
129
130	/* Disable sequencer for GPO3 */
131	ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
132	TPS65218_SEQ7_GPO3_SEQ_MASK,
133	TPS65218_PROTECT_L1);
134	if (ret)
135	return ret;
136
137	/* Setup GPO3 */
138	ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2,
139	TPS65218_CONFIG2_DC12_RST,
140	TPS65218_PROTECT_L1);
141	if (ret)
142	return ret;
143
144	break;
145	default:
146	return -EINVAL;
147	}
148
149	return 0;
150	}
151
152	static struct gpio_chip template_chip = {
153	.label = "gpio-tps65218",
154	.owner = THIS_MODULE,
155	.request = tps65218_gpio_request,
156	.direction_output = tps65218_gpio_output,
157	.direction_input = tps65218_gpio_input,
158	.get = tps65218_gpio_get,
159	.set = tps65218_gpio_set,
160	.can_sleep = true,
161	.ngpio = 3,
162	.base = -1,
163	};
164
165	static int tps65218_gpio_probe(struct platform_device *pdev)
166	{
167	struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent);
168	struct tps65218_gpio *tps65218_gpio;
169	int ret;
170
171	tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio),
172	GFP_KERNEL);
173	if (!tps65218_gpio)
174	return -ENOMEM;
175
176	tps65218_gpio->tps65218 = tps65218;
177	tps65218_gpio->gpio_chip = template_chip;
178	tps65218_gpio->gpio_chip.parent = &pdev->dev;
179	#ifdef CONFIG_OF_GPIO
180	tps65218_gpio->gpio_chip.of_node = pdev->dev.of_node;
181	#endif
182
183	ret = gpiochip_add_data(&tps65218_gpio->gpio_chip, tps65218_gpio);
184	if (ret < 0) {
185	dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
186	return ret;
187	}
188
189	platform_set_drvdata(pdev, tps65218_gpio);
190
191	return ret;
192	}
193
194	static int tps65218_gpio_remove(struct platform_device *pdev)
195	{
196	struct tps65218_gpio *tps65218_gpio = platform_get_drvdata(pdev);
197
198	gpiochip_remove(&tps65218_gpio->gpio_chip);
199
200	return 0;
201	}
202
203	static const struct of_device_id tps65218_dt_match[] = {
204	{ .compatible = "ti,tps65218-gpio" },
205	{ }
206	};
207	MODULE_DEVICE_TABLE(of, tps65218_dt_match);
208
209	static struct platform_driver tps65218_gpio_driver = {
210	.driver = {
211	.name = "tps65218-gpio",
212	.of_match_table = of_match_ptr(tps65218_dt_match)
213	},
214	.probe = tps65218_gpio_probe,
215	.remove = tps65218_gpio_remove,
216	};
217
218	module_platform_driver(tps65218_gpio_driver);
219
220	MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>");
221	MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
222	MODULE_LICENSE("GPL v2");
223	MODULE_ALIAS("platform:tps65218-gpio");