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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * gpiolib support for Wolfson Arizona class devices
 *
 * Copyright 2012 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 */

#include <linux/gpio/driver.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.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);
			pm_runtime_put_autosuspend(chip->parent);
			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);
			pm_runtime_put_autosuspend(chip->parent);
			return ret;
		}

		ret = regmap_read(arizona->regmap, reg, &val);
		if (ret < 0) {
			pm_runtime_put_autosuspend(chip->parent);
			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);
			pm_runtime_put(chip->parent);
			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 int arizona_gpio_set(struct gpio_chip *chip, unsigned int offset,
			    int value)
{
	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
	struct arizona *arizona = arizona_gpio->arizona;

	if (value)
		value = ARIZONA_GPN_LVL;

	return 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_rv			= 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 = &arizona->pdata;
	struct arizona_gpio *arizona_gpio;
	int ret;

	device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent));

	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;

	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->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) {
		pm_runtime_disable(&pdev->dev);
		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
	1	// SPDX-License-Identifier: GPL-2.0-or-later
	2	/*
	3	* gpiolib support for Wolfson Arizona class devices
	4	*
	5	* Copyright 2012 Wolfson Microelectronics PLC.
	6	*
	7	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	8	*/
	9
	10	#include <linux/gpio/driver.h>
	11	#include <linux/kernel.h>
	12	#include <linux/module.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/pm_runtime.h>
	15	#include <linux/slab.h>
	16
	17	#include <linux/mfd/arizona/core.h>
	18	#include <linux/mfd/arizona/pdata.h>
	19	#include <linux/mfd/arizona/registers.h>
	20
	21	struct arizona_gpio {
	22	struct arizona *arizona;
	23	struct gpio_chip gpio_chip;
	24	};
	25
	26	static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
	27	{
	28	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
	29	struct arizona *arizona = arizona_gpio->arizona;
	30	bool persistent = gpiochip_line_is_persistent(chip, offset);
	31	bool change;
	32	int ret;
	33
	34	ret = regmap_update_bits_check(arizona->regmap,
	35	ARIZONA_GPIO1_CTRL + offset,
	36	ARIZONA_GPN_DIR, ARIZONA_GPN_DIR,
	37	&change);
	38	if (ret < 0)
	39	return ret;
	40
	41	if (change && persistent) {
	42	pm_runtime_mark_last_busy(chip->parent);
	43	pm_runtime_put_autosuspend(chip->parent);
	44	}
	45
	46	return 0;
	47	}
	48
	49	static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset)
	50	{
	51	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
	52	struct arizona *arizona = arizona_gpio->arizona;
	53	unsigned int reg, val;
	54	int ret;
	55
	56	reg = ARIZONA_GPIO1_CTRL + offset;
	57	ret = regmap_read(arizona->regmap, reg, &val);
	58	if (ret < 0)
	59	return ret;
	60
	61	/* Resume to read actual registers for input pins */
	62	if (val & ARIZONA_GPN_DIR) {
	63	ret = pm_runtime_get_sync(chip->parent);
	64	if (ret < 0) {
	65	dev_err(chip->parent, "Failed to resume: %d\n", ret);
	66	pm_runtime_put_autosuspend(chip->parent);
	67	return ret;
	68	}
	69
	70	/* Register is cached, drop it to ensure a physical read */
	71	ret = regcache_drop_region(arizona->regmap, reg, reg);
	72	if (ret < 0) {
	73	dev_err(chip->parent, "Failed to drop cache: %d\n",
	74	ret);
	75	pm_runtime_put_autosuspend(chip->parent);
	76	return ret;
	77	}
	78
	79	ret = regmap_read(arizona->regmap, reg, &val);
	80	if (ret < 0) {
	81	pm_runtime_put_autosuspend(chip->parent);
	82	return ret;
	83	}
	84
	85	pm_runtime_mark_last_busy(chip->parent);
	86	pm_runtime_put_autosuspend(chip->parent);
	87	}
	88
	89	if (val & ARIZONA_GPN_LVL)
	90	return 1;
	91	else
	92	return 0;
	93	}
	94
	95	static int arizona_gpio_direction_out(struct gpio_chip *chip,
	96	unsigned offset, int value)
	97	{
	98	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
	99	struct arizona *arizona = arizona_gpio->arizona;
	100	bool persistent = gpiochip_line_is_persistent(chip, offset);
	101	unsigned int val;
	102	int ret;
	103
	104	ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val);
	105	if (ret < 0)
	106	return ret;
	107
	108	if ((val & ARIZONA_GPN_DIR) && persistent) {
	109	ret = pm_runtime_get_sync(chip->parent);
	110	if (ret < 0) {
	111	dev_err(chip->parent, "Failed to resume: %d\n", ret);
	112	pm_runtime_put(chip->parent);
	113	return ret;
	114	}
	115	}
	116
	117	if (value)
	118	value = ARIZONA_GPN_LVL;
	119
	120	return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
	121	ARIZONA_GPN_DIR \| ARIZONA_GPN_LVL, value);
	122	}
	123
	124	static int arizona_gpio_set(struct gpio_chip *chip, unsigned int offset,
	125	int value)
	126	{
	127	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
	128	struct arizona *arizona = arizona_gpio->arizona;
	129
	130	if (value)
	131	value = ARIZONA_GPN_LVL;
	132
	133	return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
	134	ARIZONA_GPN_LVL, value);
	135	}
	136
	137	static const struct gpio_chip template_chip = {
	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_rv = arizona_gpio_set,
	144	.can_sleep = true,
	145	};
	146
	147	static int arizona_gpio_probe(struct platform_device *pdev)
	148	{
	149	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
	150	struct arizona_pdata *pdata = &arizona->pdata;
	151	struct arizona_gpio *arizona_gpio;
	152	int ret;
	153
	154	device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent));
	155
	156	arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio),
	157	GFP_KERNEL);
	158	if (!arizona_gpio)
	159	return -ENOMEM;
	160
	161	arizona_gpio->arizona = arizona;
	162	arizona_gpio->gpio_chip = template_chip;
	163	arizona_gpio->gpio_chip.parent = &pdev->dev;
	164
	165	switch (arizona->type) {
	166	case WM5102:
	167	case WM5110:
	168	case WM8280:
	169	case WM8997:
	170	case WM8998:
	171	case WM1814:
	172	arizona_gpio->gpio_chip.ngpio = 5;
	173	break;
	174	case WM1831:
	175	case CS47L24:
	176	arizona_gpio->gpio_chip.ngpio = 2;
	177	break;
	178	default:
	179	dev_err(&pdev->dev, "Unknown chip variant %d\n",
	180	arizona->type);
	181	return -EINVAL;
	182	}
	183
	184	if (pdata->gpio_base)
	185	arizona_gpio->gpio_chip.base = pdata->gpio_base;
	186	else
	187	arizona_gpio->gpio_chip.base = -1;
	188
	189	pm_runtime_enable(&pdev->dev);
	190
	191	ret = devm_gpiochip_add_data(&pdev->dev, &arizona_gpio->gpio_chip,
	192	arizona_gpio);
	193	if (ret < 0) {
	194	pm_runtime_disable(&pdev->dev);
	195	dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
	196	ret);
	197	return ret;
	198	}
	199
	200	return 0;
	201	}
	202
	203	static struct platform_driver arizona_gpio_driver = {
	204	.driver.name = "arizona-gpio",
	205	.probe = arizona_gpio_probe,
	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");