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

// SPDX-License-Identifier: GPL-2.0
/*
 * GPIO support for Cirrus Logic Madera codecs
 *
 * Copyright (C) 2015-2018 Cirrus Logic
 *
 * 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; version 2.
 */

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