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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * GPIO support for Cirrus Logic Madera codecs
 *
 * Copyright (C) 2015-2018 Cirrus Logic
 */

#include <linux/gpio/driver.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>

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

struct madera_gpio {
	struct madera *madera;
	/* storage space for the gpio_chip we're using */
	struct gpio_chip gpio_chip;
};

static int madera_gpio_get_direction(struct gpio_chip *chip,
				     unsigned int offset)
{
	struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
	struct madera *madera = madera_gpio->madera;
	unsigned int reg_offset = 2 * offset;
	unsigned int val;
	int ret;

	ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_2 + reg_offset,
			  &val);
	if (ret < 0)
		return ret;

	return !!(val & MADERA_GP1_DIR_MASK);
}

static int madera_gpio_direction_in(struct gpio_chip *chip, unsigned int offset)
{
	struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
	struct madera *madera = madera_gpio->madera;
	unsigned int reg_offset = 2 * offset;

	return regmap_update_bits(madera->regmap,
				  MADERA_GPIO1_CTRL_2 + reg_offset,
				  MADERA_GP1_DIR_MASK, MADERA_GP1_DIR);
}

static int madera_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
	struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
	struct madera *madera = madera_gpio->madera;
	unsigned int reg_offset = 2 * offset;
	unsigned int val;
	int ret;

	ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_1 + reg_offset,
			  &val);
	if (ret < 0)
		return ret;

	return !!(val & MADERA_GP1_LVL_MASK);
}

static int madera_gpio_direction_out(struct gpio_chip *chip,
				     unsigned int offset, int value)
{
	struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
	struct madera *madera = madera_gpio->madera;
	unsigned int reg_offset = 2 * offset;
	unsigned int reg_val = value ? MADERA_GP1_LVL : 0;
	int ret;

	ret = regmap_update_bits(madera->regmap,
				 MADERA_GPIO1_CTRL_2 + reg_offset,
				 MADERA_GP1_DIR_MASK, 0);
	if (ret < 0)
		return ret;

	return regmap_update_bits(madera->regmap,
				  MADERA_GPIO1_CTRL_1 + reg_offset,
				  MADERA_GP1_LVL_MASK, reg_val);
}

static void madera_gpio_set(struct gpio_chip *chip, unsigned int offset,
			    int value)
{
	struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
	struct madera *madera = madera_gpio->madera;
	unsigned int reg_offset = 2 * offset;
	unsigned int reg_val = value ? MADERA_GP1_LVL : 0;
	int ret;

	ret = regmap_update_bits(madera->regmap,
				 MADERA_GPIO1_CTRL_1 + reg_offset,
				 MADERA_GP1_LVL_MASK, reg_val);

	/* set() doesn't return an error so log a warning */
	if (ret)
		dev_warn(madera->dev, "Failed to write to 0x%x (%d)\n",
			 MADERA_GPIO1_CTRL_1 + reg_offset, ret);
}

static const struct gpio_chip madera_gpio_chip = {
	.label			= "madera",
	.owner			= THIS_MODULE,
	.request		= gpiochip_generic_request,
	.free			= gpiochip_generic_free,
	.get_direction		= madera_gpio_get_direction,
	.direction_input	= madera_gpio_direction_in,
	.get			= madera_gpio_get,
	.direction_output	= madera_gpio_direction_out,
	.set			= madera_gpio_set,
	.set_config		= gpiochip_generic_config,
	.can_sleep		= true,
};

static int madera_gpio_probe(struct platform_device *pdev)
{
	struct madera *madera = dev_get_drvdata(pdev->dev.parent);
	struct madera_pdata *pdata = dev_get_platdata(madera->dev);
	struct madera_gpio *madera_gpio;
	int ret;

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

	madera_gpio->madera = madera;

	/* Construct suitable gpio_chip from the template in madera_gpio_chip */
	madera_gpio->gpio_chip = madera_gpio_chip;
	madera_gpio->gpio_chip.parent = pdev->dev.parent;

	switch (madera->type) {
	case CS47L35:
		madera_gpio->gpio_chip.ngpio = CS47L35_NUM_GPIOS;
		break;
	case CS47L85:
	case WM1840:
		madera_gpio->gpio_chip.ngpio = CS47L85_NUM_GPIOS;
		break;
	case CS47L90:
	case CS47L91:
		madera_gpio->gpio_chip.ngpio = CS47L90_NUM_GPIOS;
		break;
	default:
		dev_err(&pdev->dev, "Unknown chip variant %d\n", madera->type);
		return -EINVAL;
	}

	/* We want to be usable on systems that don't use devicetree or acpi */
	if (pdata && pdata->gpio_base)
		madera_gpio->gpio_chip.base = pdata->gpio_base;
	else
		madera_gpio->gpio_chip.base = -1;

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

	/*
	 * This is part of a composite MFD device which can only be used with
	 * the corresponding pinctrl driver. On all supported silicon the GPIO
	 * to pinctrl mapping is fixed in the silicon, so we register it
	 * explicitly instead of requiring a redundant gpio-ranges in the
	 * devicetree.
	 * In any case we also want to work on systems that don't use devicetree
	 * or acpi.
	 */
	ret = gpiochip_add_pin_range(&madera_gpio->gpio_chip, "madera-pinctrl",
				     0, 0, madera_gpio->gpio_chip.ngpio);
	if (ret) {
		dev_dbg(&pdev->dev, "Failed to add pin range (%d)\n", ret);
		return ret;
	}

	return 0;
}

static struct platform_driver madera_gpio_driver = {
	.driver = {
		.name	= "madera-gpio",
	},
	.probe		= madera_gpio_probe,
};

module_platform_driver(madera_gpio_driver);

MODULE_SOFTDEP("pre: pinctrl-madera");
MODULE_DESCRIPTION("GPIO interface for Madera codecs");
MODULE_AUTHOR("Nariman Poushin <nariman@opensource.cirrus.com>");
MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:madera-gpio");
Commit	Line	Data
690499d9	1	// SPDX-License-Identifier: GPL-2.0-only
aca429ff RF	2	/*
	3	* GPIO support for Cirrus Logic Madera codecs
	4	*
	5	* Copyright (C) 2015-2018 Cirrus Logic
aca429ff RF	6	*/
	7
	8	#include <linux/gpio/driver.h>
	9	#include <linux/kernel.h>
	10	#include <linux/module.h>
	11	#include <linux/platform_device.h>
	12
	13	#include <linux/mfd/madera/core.h>
	14	#include <linux/mfd/madera/pdata.h>
	15	#include <linux/mfd/madera/registers.h>
	16
	17	struct madera_gpio {
	18	struct madera *madera;
	19	/* storage space for the gpio_chip we're using */
	20	struct gpio_chip gpio_chip;
	21	};
	22
	23	static int madera_gpio_get_direction(struct gpio_chip *chip,
	24	unsigned int offset)
	25	{
	26	struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
	27	struct madera *madera = madera_gpio->madera;
	28	unsigned int reg_offset = 2 * offset;
	29	unsigned int val;
	30	int ret;
	31
	32	ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_2 + reg_offset,
	33	&val);
	34	if (ret < 0)
	35	return ret;
	36
	37	return !!(val & MADERA_GP1_DIR_MASK);
	38	}
	39
	40	static int madera_gpio_direction_in(struct gpio_chip *chip, unsigned int offset)
	41	{
	42	struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
	43	struct madera *madera = madera_gpio->madera;
	44	unsigned int reg_offset = 2 * offset;
	45
	46	return regmap_update_bits(madera->regmap,
	47	MADERA_GPIO1_CTRL_2 + reg_offset,
	48	MADERA_GP1_DIR_MASK, MADERA_GP1_DIR);
	49	}
	50
	51	static int madera_gpio_get(struct gpio_chip *chip, unsigned int offset)
	52	{
	53	struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
	54	struct madera *madera = madera_gpio->madera;
	55	unsigned int reg_offset = 2 * offset;
	56	unsigned int val;
	57	int ret;
	58
	59	ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_1 + reg_offset,
	60	&val);
	61	if (ret < 0)
	62	return ret;
	63
	64	return !!(val & MADERA_GP1_LVL_MASK);
	65	}
	66
	67	static int madera_gpio_direction_out(struct gpio_chip *chip,
	68	unsigned int offset, int value)
	69	{
70	struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
71	struct madera *madera = madera_gpio->madera;
72	unsigned int reg_offset = 2 * offset;
73	unsigned int reg_val = value ? MADERA_GP1_LVL : 0;
74	int ret;
75
76	ret = regmap_update_bits(madera->regmap,
77	MADERA_GPIO1_CTRL_2 + reg_offset,
78	MADERA_GP1_DIR_MASK, 0);
79	if (ret < 0)
80	return ret;
81
82	return regmap_update_bits(madera->regmap,
83	MADERA_GPIO1_CTRL_1 + reg_offset,
84	MADERA_GP1_LVL_MASK, reg_val);
85	}
86
87	static void madera_gpio_set(struct gpio_chip *chip, unsigned int offset,
88	int value)
89	{
90	struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
91	struct madera *madera = madera_gpio->madera;
92	unsigned int reg_offset = 2 * offset;
93	unsigned int reg_val = value ? MADERA_GP1_LVL : 0;
94	int ret;
95
96	ret = regmap_update_bits(madera->regmap,
97	MADERA_GPIO1_CTRL_1 + reg_offset,
98	MADERA_GP1_LVL_MASK, reg_val);
99
100	/* set() doesn't return an error so log a warning */
101	if (ret)
102	dev_warn(madera->dev, "Failed to write to 0x%x (%d)\n",
103	MADERA_GPIO1_CTRL_1 + reg_offset, ret);
104	}
105
0faf40e3	106	static const struct gpio_chip madera_gpio_chip = {
aca429ff RF	107	.label = "madera",
	108	.owner = THIS_MODULE,
	109	.request = gpiochip_generic_request,
	110	.free = gpiochip_generic_free,
	111	.get_direction = madera_gpio_get_direction,
	112	.direction_input = madera_gpio_direction_in,
	113	.get = madera_gpio_get,
	114	.direction_output = madera_gpio_direction_out,
	115	.set = madera_gpio_set,
	116	.set_config = gpiochip_generic_config,
	117	.can_sleep = true,
	118	};
	119
	120	static int madera_gpio_probe(struct platform_device *pdev)
	121	{
	122	struct madera *madera = dev_get_drvdata(pdev->dev.parent);
	123	struct madera_pdata *pdata = dev_get_platdata(madera->dev);
	124	struct madera_gpio *madera_gpio;
	125	int ret;
	126
	127	madera_gpio = devm_kzalloc(&pdev->dev, sizeof(*madera_gpio),
	128	GFP_KERNEL);
	129	if (!madera_gpio)
	130	return -ENOMEM;
	131
	132	madera_gpio->madera = madera;
	133
	134	/* Construct suitable gpio_chip from the template in madera_gpio_chip */
	135	madera_gpio->gpio_chip = madera_gpio_chip;
	136	madera_gpio->gpio_chip.parent = pdev->dev.parent;
	137
	138	switch (madera->type) {
	139	case CS47L35:
	140	madera_gpio->gpio_chip.ngpio = CS47L35_NUM_GPIOS;
	141	break;
	142	case CS47L85:
	143	case WM1840:
	144	madera_gpio->gpio_chip.ngpio = CS47L85_NUM_GPIOS;
	145	break;
	146	case CS47L90:
	147	case CS47L91:
	148	madera_gpio->gpio_chip.ngpio = CS47L90_NUM_GPIOS;
	149	break;
	150	default:
	151	dev_err(&pdev->dev, "Unknown chip variant %d\n", madera->type);
	152	return -EINVAL;
	153	}
	154
	155	/* We want to be usable on systems that don't use devicetree or acpi */
	156	if (pdata && pdata->gpio_base)
	157	madera_gpio->gpio_chip.base = pdata->gpio_base;
	158	else
	159	madera_gpio->gpio_chip.base = -1;
	160
	161	ret = devm_gpiochip_add_data(&pdev->dev,
	162	&madera_gpio->gpio_chip,
	163	madera_gpio);
	164	if (ret < 0) {
	165	dev_dbg(&pdev->dev, "Could not register gpiochip, %d\n", ret);
	166	return ret;
	167	}
	168
	169	/*
	170	* This is part of a composite MFD device which can only be used with
171	* the corresponding pinctrl driver. On all supported silicon the GPIO
172	* to pinctrl mapping is fixed in the silicon, so we register it
173	* explicitly instead of requiring a redundant gpio-ranges in the
174	* devicetree.
175	* In any case we also want to work on systems that don't use devicetree
176	* or acpi.
177	*/
178	ret = gpiochip_add_pin_range(&madera_gpio->gpio_chip, "madera-pinctrl",
179	0, 0, madera_gpio->gpio_chip.ngpio);
180	if (ret) {
181	dev_dbg(&pdev->dev, "Failed to add pin range (%d)\n", ret);
182	return ret;
183	}
184
185	return 0;
186	}
187
188	static struct platform_driver madera_gpio_driver = {
189	.driver = {
190	.name = "madera-gpio",
191	},
192	.probe = madera_gpio_probe,
193	};
194
195	module_platform_driver(madera_gpio_driver);
196
197	MODULE_SOFTDEP("pre: pinctrl-madera");
198	MODULE_DESCRIPTION("GPIO interface for Madera codecs");
199	MODULE_AUTHOR("Nariman Poushin <nariman@opensource.cirrus.com>");
200	MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
201	MODULE_LICENSE("GPL v2");
202	MODULE_ALIAS("platform:madera-gpio");