[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/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/gpio/driver.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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
31ba56f2 MB	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>
31ba56f2 MB	8	*/
	9
	10	#include <linux/kernel.h>
	11	#include <linux/slab.h>
	12	#include <linux/module.h>
2e21ec4c	13	#include <linux/gpio/driver.h>
31ba56f2	14	#include <linux/platform_device.h>
11598d17	15	#include <linux/pm_runtime.h>
31ba56f2 MB	16	#include <linux/seq_file.h>
	17
	18	#include <linux/mfd/arizona/core.h>
	19	#include <linux/mfd/arizona/pdata.h>
	20	#include <linux/mfd/arizona/registers.h>
	21
	22	struct arizona_gpio {
	23	struct arizona *arizona;
	24	struct gpio_chip gpio_chip;
	25	};
	26
31ba56f2 MB	27	static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
31ba56f2 MB	28	{
18992d4e	29	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
31ba56f2	30	struct arizona *arizona = arizona_gpio->arizona;
27a49ed1 CK	31	bool persistent = gpiochip_line_is_persistent(chip, offset);
	32	bool change;
	33	int ret;
31ba56f2	34
27a49ed1 CK	35	ret = regmap_update_bits_check(arizona->regmap,
	36	ARIZONA_GPIO1_CTRL + offset,
	37	ARIZONA_GPN_DIR, ARIZONA_GPN_DIR,
	38	&change);
	39	if (ret < 0)
	40	return ret;
	41
	42	if (change && persistent) {
	43	pm_runtime_mark_last_busy(chip->parent);
	44	pm_runtime_put_autosuspend(chip->parent);
	45	}
	46
	47	return 0;
31ba56f2 MB	48	}
	49
	50	static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset)
	51	{
18992d4e	52	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
31ba56f2	53	struct arizona *arizona = arizona_gpio->arizona;
11598d17	54	unsigned int reg, val;
31ba56f2 MB	55	int ret;
31ba56f2 MB	56
11598d17 CK	57	reg = ARIZONA_GPIO1_CTRL + offset;
11598d17 CK	58	ret = regmap_read(arizona->regmap, reg, &val);
31ba56f2 MB	59	if (ret < 0)
	60	return ret;
	61
11598d17	62	/* Resume to read actual registers for input pins */
64c6a711	63	if (val & ARIZONA_GPN_DIR) {
11598d17 CK	64	ret = pm_runtime_get_sync(chip->parent);
	65	if (ret < 0) {
	66	dev_err(chip->parent, "Failed to resume: %d\n", ret);
	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	return ret;
	76	}
	77
	78	ret = regmap_read(arizona->regmap, reg, &val);
	79	if (ret < 0)
	80	return ret;
	81
	82	pm_runtime_mark_last_busy(chip->parent);
	83	pm_runtime_put_autosuspend(chip->parent);
	84	}
	85
31ba56f2 MB	86	if (val & ARIZONA_GPN_LVL)
	87	return 1;
	88	else
	89	return 0;
	90	}
	91
	92	static int arizona_gpio_direction_out(struct gpio_chip *chip,
	93	unsigned offset, int value)
	94	{
18992d4e	95	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
31ba56f2	96	struct arizona *arizona = arizona_gpio->arizona;
27a49ed1 CK	97	bool persistent = gpiochip_line_is_persistent(chip, offset);
	98	unsigned int val;
	99	int ret;
	100
	101	ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val);
	102	if (ret < 0)
	103	return ret;
	104
	105	if ((val & ARIZONA_GPN_DIR) && persistent) {
	106	ret = pm_runtime_get_sync(chip->parent);
	107	if (ret < 0) {
	108	dev_err(chip->parent, "Failed to resume: %d\n", ret);
	109	return ret;
	110	}
	111	}
31ba56f2 MB	112
	113	if (value)
	114	value = ARIZONA_GPN_LVL;
	115
	116	return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
	117	ARIZONA_GPN_DIR \| ARIZONA_GPN_LVL, value);
	118	}
	119
	120	static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	121	{
18992d4e	122	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
31ba56f2 MB	123	struct arizona *arizona = arizona_gpio->arizona;
	124
	125	if (value)
	126	value = ARIZONA_GPN_LVL;
	127
	128	regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
	129	ARIZONA_GPN_LVL, value);
	130	}
	131
e35b5ab0	132	static const struct gpio_chip template_chip = {
31ba56f2 MB	133	.label = "arizona",
	134	.owner = THIS_MODULE,
	135	.direction_input = arizona_gpio_direction_in,
	136	.get = arizona_gpio_get,
	137	.direction_output = arizona_gpio_direction_out,
	138	.set = arizona_gpio_set,
9fb1f39e	139	.can_sleep = true,
31ba56f2 MB	140	};
31ba56f2 MB	141
3836309d	142	static int arizona_gpio_probe(struct platform_device *pdev)
31ba56f2 MB	143	{
31ba56f2 MB	144	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
e56aee18	145	struct arizona_pdata *pdata = dev_get_platdata(arizona->dev);
31ba56f2 MB	146	struct arizona_gpio *arizona_gpio;
	147	int ret;
	148
	149	arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio),
	150	GFP_KERNEL);
afeb7b45	151	if (!arizona_gpio)
31ba56f2 MB	152	return -ENOMEM;
	153
	154	arizona_gpio->arizona = arizona;
	155	arizona_gpio->gpio_chip = template_chip;
58383c78	156	arizona_gpio->gpio_chip.parent = &pdev->dev;
4bbd6f2e CK	157	#ifdef CONFIG_OF_GPIO
	158	arizona_gpio->gpio_chip.of_node = arizona->dev->of_node;
	159	#endif
31ba56f2 MB	160
	161	switch (arizona->type) {
	162	case WM5102:
	163	case WM5110:
449c175e	164	case WM8280:
d9cadcc9	165	case WM8997:
633a5065 RF	166	case WM8998:
633a5065 RF	167	case WM1814:
31ba56f2 MB	168	arizona_gpio->gpio_chip.ngpio = 5;
31ba56f2 MB	169	break;
7d07d15a RF	170	case WM1831:
	171	case CS47L24:
	172	arizona_gpio->gpio_chip.ngpio = 2;
	173	break;
31ba56f2 MB	174	default:
	175	dev_err(&pdev->dev, "Unknown chip variant %d\n",
	176	arizona->type);
	177	return -EINVAL;
	178	}
	179
	180	if (pdata && pdata->gpio_base)
	181	arizona_gpio->gpio_chip.base = pdata->gpio_base;
	182	else
	183	arizona_gpio->gpio_chip.base = -1;
	184
27a49ed1 CK	185	pm_runtime_enable(&pdev->dev);
27a49ed1 CK	186
db303a90 LD	187	ret = devm_gpiochip_add_data(&pdev->dev, &arizona_gpio->gpio_chip,
db303a90 LD	188	arizona_gpio);
31ba56f2 MB	189	if (ret < 0) {
	190	dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
	191	ret);
975acebb	192	return ret;
31ba56f2 MB	193	}
31ba56f2 MB	194
975acebb	195	return 0;
31ba56f2 MB	196	}
31ba56f2 MB	197
31ba56f2 MB	198	static struct platform_driver arizona_gpio_driver = {
31ba56f2 MB	199	.driver.name = "arizona-gpio",
31ba56f2	200	.probe = arizona_gpio_probe,
31ba56f2 MB	201	};
	202
	203	module_platform_driver(arizona_gpio_driver);
	204
	205	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	206	MODULE_DESCRIPTION("GPIO interface for Arizona devices");
	207	MODULE_LICENSE("GPL");
	208	MODULE_ALIAS("platform:arizona-gpio");