[mirror_ubuntu-bionic-kernel.git] / drivers / gpio / gpio-arizona.c

/*
 * gpiolib support for Wolfson Arizona class devices
 *
 * Copyright 2012 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 *  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/slab.h>
#include <linux/module.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/seq_file.h>

#include <linux/mfd/arizona/core.h>
#include <linux/mfd/arizona/pdata.h>
#include <linux/mfd/arizona/registers.h>

struct arizona_gpio {
	struct arizona *arizona;
	struct gpio_chip gpio_chip;
};

static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
{
	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
	struct arizona *arizona = arizona_gpio->arizona;
	bool persistent = gpiochip_line_is_persistent(chip, offset);
	bool change;
	int ret;

	ret = regmap_update_bits_check(arizona->regmap,
				       ARIZONA_GPIO1_CTRL + offset,
				       ARIZONA_GPN_DIR, ARIZONA_GPN_DIR,
				       &change);
	if (ret < 0)
		return ret;

	if (change && persistent) {
		pm_runtime_mark_last_busy(chip->parent);
		pm_runtime_put_autosuspend(chip->parent);
	}

	return 0;
}

static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
	struct arizona *arizona = arizona_gpio->arizona;
	unsigned int reg, val;
	int ret;

	reg = ARIZONA_GPIO1_CTRL + offset;
	ret = regmap_read(arizona->regmap, reg, &val);
	if (ret < 0)
		return ret;

	/* Resume to read actual registers for input pins */
	if (val & ARIZONA_GPN_DIR) {
		ret = pm_runtime_get_sync(chip->parent);
		if (ret < 0) {
			dev_err(chip->parent, "Failed to resume: %d\n", ret);
			return ret;
		}

		/* Register is cached, drop it to ensure a physical read */
		ret = regcache_drop_region(arizona->regmap, reg, reg);
		if (ret < 0) {
			dev_err(chip->parent, "Failed to drop cache: %d\n",
				ret);
			return ret;
		}

		ret = regmap_read(arizona->regmap, reg, &val);
		if (ret < 0)
			return ret;

		pm_runtime_mark_last_busy(chip->parent);
		pm_runtime_put_autosuspend(chip->parent);
	}

	if (val & ARIZONA_GPN_LVL)
		return 1;
	else
		return 0;
}

static int arizona_gpio_direction_out(struct gpio_chip *chip,
				     unsigned offset, int value)
{
	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
	struct arizona *arizona = arizona_gpio->arizona;
	bool persistent = gpiochip_line_is_persistent(chip, offset);
	unsigned int val;
	int ret;

	ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val);
	if (ret < 0)
		return ret;

	if ((val & ARIZONA_GPN_DIR) && persistent) {
		ret = pm_runtime_get_sync(chip->parent);
		if (ret < 0) {
			dev_err(chip->parent, "Failed to resume: %d\n", ret);
			return ret;
		}
	}

	if (value)
		value = ARIZONA_GPN_LVL;

	return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
				  ARIZONA_GPN_DIR | ARIZONA_GPN_LVL, value);
}

static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
	struct arizona *arizona = arizona_gpio->arizona;

	if (value)
		value = ARIZONA_GPN_LVL;

	regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
			   ARIZONA_GPN_LVL, value);
}

static const struct gpio_chip template_chip = {
	.label			= "arizona",
	.owner			= THIS_MODULE,
	.direction_input	= arizona_gpio_direction_in,
	.get			= arizona_gpio_get,
	.direction_output	= arizona_gpio_direction_out,
	.set			= arizona_gpio_set,
	.can_sleep		= true,
};

static int arizona_gpio_probe(struct platform_device *pdev)
{
	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
	struct arizona_pdata *pdata = dev_get_platdata(arizona->dev);
	struct arizona_gpio *arizona_gpio;
	int ret;

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

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

	switch (arizona->type) {
	case WM5102:
	case WM5110:
	case WM8280:
	case WM8997:
	case WM8998:
	case WM1814:
		arizona_gpio->gpio_chip.ngpio = 5;
		break;
	case WM1831:
	case CS47L24:
		arizona_gpio->gpio_chip.ngpio = 2;
		break;
	default:
		dev_err(&pdev->dev, "Unknown chip variant %d\n",
			arizona->type);
		return -EINVAL;
	}

	if (pdata && pdata->gpio_base)
		arizona_gpio->gpio_chip.base = pdata->gpio_base;
	else
		arizona_gpio->gpio_chip.base = -1;

	pm_runtime_enable(&pdev->dev);

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

	return 0;
}

static struct platform_driver arizona_gpio_driver = {
	.driver.name	= "arizona-gpio",
	.probe		= arizona_gpio_probe,
};

module_platform_driver(arizona_gpio_driver);

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("GPIO interface for Arizona devices");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:arizona-gpio");
Commit	Line	Data
31ba56f2 MB	1	/*
	2	* gpiolib support for Wolfson Arizona class devices
	3	*
	4	* Copyright 2012 Wolfson Microelectronics PLC.
	5	*
	6	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*
	13	*/
	14
	15	#include <linux/kernel.h>
	16	#include <linux/slab.h>
	17	#include <linux/module.h>
	18	#include <linux/gpio.h>
	19	#include <linux/platform_device.h>
11598d17	20	#include <linux/pm_runtime.h>
31ba56f2 MB	21	#include <linux/seq_file.h>
	22
	23	#include <linux/mfd/arizona/core.h>
	24	#include <linux/mfd/arizona/pdata.h>
	25	#include <linux/mfd/arizona/registers.h>
	26
	27	struct arizona_gpio {
	28	struct arizona *arizona;
	29	struct gpio_chip gpio_chip;
	30	};
	31
31ba56f2 MB	32	static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
31ba56f2 MB	33	{
18992d4e	34	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
31ba56f2	35	struct arizona *arizona = arizona_gpio->arizona;
27a49ed1 CK	36	bool persistent = gpiochip_line_is_persistent(chip, offset);
	37	bool change;
	38	int ret;
31ba56f2	39
27a49ed1 CK	40	ret = regmap_update_bits_check(arizona->regmap,
	41	ARIZONA_GPIO1_CTRL + offset,
	42	ARIZONA_GPN_DIR, ARIZONA_GPN_DIR,
	43	&change);
	44	if (ret < 0)
	45	return ret;
	46
	47	if (change && persistent) {
	48	pm_runtime_mark_last_busy(chip->parent);
	49	pm_runtime_put_autosuspend(chip->parent);
	50	}
	51
	52	return 0;
31ba56f2 MB	53	}
	54
	55	static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset)
	56	{
18992d4e	57	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
31ba56f2	58	struct arizona *arizona = arizona_gpio->arizona;
11598d17	59	unsigned int reg, val;
31ba56f2 MB	60	int ret;
31ba56f2 MB	61
11598d17 CK	62	reg = ARIZONA_GPIO1_CTRL + offset;
11598d17 CK	63	ret = regmap_read(arizona->regmap, reg, &val);
31ba56f2 MB	64	if (ret < 0)
	65	return ret;
	66
11598d17	67	/* Resume to read actual registers for input pins */
64c6a711	68	if (val & ARIZONA_GPN_DIR) {
11598d17 CK	69	ret = pm_runtime_get_sync(chip->parent);
	70	if (ret < 0) {
	71	dev_err(chip->parent, "Failed to resume: %d\n", ret);
	72	return ret;
	73	}
	74
	75	/* Register is cached, drop it to ensure a physical read */
	76	ret = regcache_drop_region(arizona->regmap, reg, reg);
	77	if (ret < 0) {
	78	dev_err(chip->parent, "Failed to drop cache: %d\n",
	79	ret);
	80	return ret;
	81	}
	82
	83	ret = regmap_read(arizona->regmap, reg, &val);
	84	if (ret < 0)
	85	return ret;
	86
	87	pm_runtime_mark_last_busy(chip->parent);
	88	pm_runtime_put_autosuspend(chip->parent);
	89	}
	90
31ba56f2 MB	91	if (val & ARIZONA_GPN_LVL)
	92	return 1;
	93	else
	94	return 0;
	95	}
	96
	97	static int arizona_gpio_direction_out(struct gpio_chip *chip,
	98	unsigned offset, int value)
	99	{
18992d4e	100	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
31ba56f2	101	struct arizona *arizona = arizona_gpio->arizona;
27a49ed1 CK	102	bool persistent = gpiochip_line_is_persistent(chip, offset);
	103	unsigned int val;
	104	int ret;
	105
	106	ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val);
	107	if (ret < 0)
	108	return ret;
	109
	110	if ((val & ARIZONA_GPN_DIR) && persistent) {
	111	ret = pm_runtime_get_sync(chip->parent);
	112	if (ret < 0) {
	113	dev_err(chip->parent, "Failed to resume: %d\n", ret);
	114	return ret;
	115	}
	116	}
31ba56f2 MB	117
	118	if (value)
	119	value = ARIZONA_GPN_LVL;
	120
	121	return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
	122	ARIZONA_GPN_DIR \| ARIZONA_GPN_LVL, value);
	123	}
	124
	125	static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	126	{
18992d4e	127	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
31ba56f2 MB	128	struct arizona *arizona = arizona_gpio->arizona;
	129
	130	if (value)
	131	value = ARIZONA_GPN_LVL;
	132
	133	regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
	134	ARIZONA_GPN_LVL, value);
	135	}
	136
e35b5ab0	137	static const struct gpio_chip template_chip = {
31ba56f2 MB	138	.label = "arizona",
	139	.owner = THIS_MODULE,
	140	.direction_input = arizona_gpio_direction_in,
	141	.get = arizona_gpio_get,
	142	.direction_output = arizona_gpio_direction_out,
	143	.set = arizona_gpio_set,
9fb1f39e	144	.can_sleep = true,
31ba56f2 MB	145	};
31ba56f2 MB	146
3836309d	147	static int arizona_gpio_probe(struct platform_device *pdev)
31ba56f2 MB	148	{
31ba56f2 MB	149	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
e56aee18	150	struct arizona_pdata *pdata = dev_get_platdata(arizona->dev);
31ba56f2 MB	151	struct arizona_gpio *arizona_gpio;
	152	int ret;
	153
	154	arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio),
	155	GFP_KERNEL);
afeb7b45	156	if (!arizona_gpio)
31ba56f2 MB	157	return -ENOMEM;
	158
	159	arizona_gpio->arizona = arizona;
	160	arizona_gpio->gpio_chip = template_chip;
58383c78	161	arizona_gpio->gpio_chip.parent = &pdev->dev;
4bbd6f2e CK	162	#ifdef CONFIG_OF_GPIO
	163	arizona_gpio->gpio_chip.of_node = arizona->dev->of_node;
	164	#endif
31ba56f2 MB	165
	166	switch (arizona->type) {
	167	case WM5102:
	168	case WM5110:
449c175e	169	case WM8280:
d9cadcc9	170	case WM8997:
633a5065 RF	171	case WM8998:
633a5065 RF	172	case WM1814:
31ba56f2 MB	173	arizona_gpio->gpio_chip.ngpio = 5;
31ba56f2 MB	174	break;
7d07d15a RF	175	case WM1831:
	176	case CS47L24:
	177	arizona_gpio->gpio_chip.ngpio = 2;
	178	break;
31ba56f2 MB	179	default:
	180	dev_err(&pdev->dev, "Unknown chip variant %d\n",
	181	arizona->type);
	182	return -EINVAL;
	183	}
	184
	185	if (pdata && pdata->gpio_base)
	186	arizona_gpio->gpio_chip.base = pdata->gpio_base;
	187	else
	188	arizona_gpio->gpio_chip.base = -1;
	189
27a49ed1 CK	190	pm_runtime_enable(&pdev->dev);
27a49ed1 CK	191
db303a90 LD	192	ret = devm_gpiochip_add_data(&pdev->dev, &arizona_gpio->gpio_chip,
db303a90 LD	193	arizona_gpio);
31ba56f2 MB	194	if (ret < 0) {
	195	dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
	196	ret);
975acebb	197	return ret;
31ba56f2 MB	198	}
31ba56f2 MB	199
975acebb	200	return 0;
31ba56f2 MB	201	}
31ba56f2 MB	202
31ba56f2 MB	203	static struct platform_driver arizona_gpio_driver = {
31ba56f2 MB	204	.driver.name = "arizona-gpio",
31ba56f2	205	.probe = arizona_gpio_probe,
31ba56f2 MB	206	};
	207
	208	module_platform_driver(arizona_gpio_driver);
	209
	210	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	211	MODULE_DESCRIPTION("GPIO interface for Arizona devices");
	212	MODULE_LICENSE("GPL");
	213	MODULE_ALIAS("platform:arizona-gpio");