[linux.git] / drivers / gpio / gpio-sl28cpld.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * sl28cpld GPIO driver
 *
 * Copyright 2020 Michael Walle <[email protected]>
 */

#include <linux/device.h>
#include <linux/gpio/driver.h>
#include <linux/gpio/regmap.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

/* GPIO flavor */
#define GPIO_REG_DIR	0x00
#define GPIO_REG_OUT	0x01
#define GPIO_REG_IN	0x02
#define GPIO_REG_IE	0x03
#define GPIO_REG_IP	0x04

/* input-only flavor */
#define GPI_REG_IN	0x00

/* output-only flavor */
#define GPO_REG_OUT	0x00

enum sl28cpld_gpio_type {
	SL28CPLD_GPIO = 1,
	SL28CPLD_GPI,
	SL28CPLD_GPO,
};

static const struct regmap_irq sl28cpld_gpio_irqs[] = {
	REGMAP_IRQ_REG_LINE(0, 8),
	REGMAP_IRQ_REG_LINE(1, 8),
	REGMAP_IRQ_REG_LINE(2, 8),
	REGMAP_IRQ_REG_LINE(3, 8),
	REGMAP_IRQ_REG_LINE(4, 8),
	REGMAP_IRQ_REG_LINE(5, 8),
	REGMAP_IRQ_REG_LINE(6, 8),
	REGMAP_IRQ_REG_LINE(7, 8),
};

static int sl28cpld_gpio_irq_init(struct platform_device *pdev,
				  unsigned int base,
				  struct gpio_regmap_config *config)
{
	struct regmap_irq_chip_data *irq_data;
	struct regmap_irq_chip *irq_chip;
	struct device *dev = &pdev->dev;
	int irq, ret;

	if (!device_property_read_bool(dev, "interrupt-controller"))
		return 0;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		return irq;

	irq_chip = devm_kzalloc(dev, sizeof(*irq_chip), GFP_KERNEL);
	if (!irq_chip)
		return -ENOMEM;

	irq_chip->name = "sl28cpld-gpio-irq",
	irq_chip->irqs = sl28cpld_gpio_irqs;
	irq_chip->num_irqs = ARRAY_SIZE(sl28cpld_gpio_irqs);
	irq_chip->num_regs = 1;
	irq_chip->status_base = base + GPIO_REG_IP;
	irq_chip->mask_base = base + GPIO_REG_IE;
	irq_chip->mask_invert = true,
	irq_chip->ack_base = base + GPIO_REG_IP;

	ret = devm_regmap_add_irq_chip_fwnode(dev, dev_fwnode(dev),
					      config->regmap, irq,
					      IRQF_SHARED | IRQF_ONESHOT,
					      0, irq_chip, &irq_data);
	if (ret)
		return ret;

	config->irq_domain = regmap_irq_get_domain(irq_data);

	return 0;
}

static int sl28cpld_gpio_probe(struct platform_device *pdev)
{
	struct gpio_regmap_config config = {0};
	enum sl28cpld_gpio_type type;
	struct regmap *regmap;
	u32 base;
	int ret;

	if (!pdev->dev.parent)
		return -ENODEV;

	type = (uintptr_t)device_get_match_data(&pdev->dev);
	if (!type)
		return -ENODEV;

	ret = device_property_read_u32(&pdev->dev, "reg", &base);
	if (ret)
		return -EINVAL;

	regmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!regmap)
		return -ENODEV;

	config.regmap = regmap;
	config.parent = &pdev->dev;
	config.ngpio = 8;

	switch (type) {
	case SL28CPLD_GPIO:
		config.reg_dat_base = base + GPIO_REG_IN;
		config.reg_set_base = base + GPIO_REG_OUT;
		/* reg_dir_out_base might be zero */
		config.reg_dir_out_base = GPIO_REGMAP_ADDR(base + GPIO_REG_DIR);

		/* This type supports interrupts */
		ret = sl28cpld_gpio_irq_init(pdev, base, &config);
		if (ret)
			return ret;
		break;
	case SL28CPLD_GPO:
		config.reg_set_base = base + GPO_REG_OUT;
		break;
	case SL28CPLD_GPI:
		config.reg_dat_base = base + GPI_REG_IN;
		break;
	default:
		dev_err(&pdev->dev, "unknown type %d\n", type);
		return -ENODEV;
	}

	return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config));
}

static const struct of_device_id sl28cpld_gpio_of_match[] = {
	{ .compatible = "kontron,sl28cpld-gpio", .data = (void *)SL28CPLD_GPIO },
	{ .compatible = "kontron,sl28cpld-gpi", .data = (void *)SL28CPLD_GPI },
	{ .compatible = "kontron,sl28cpld-gpo", .data = (void *)SL28CPLD_GPO },
	{}
};
MODULE_DEVICE_TABLE(of, sl28cpld_gpio_of_match);

static struct platform_driver sl28cpld_gpio_driver = {
	.probe = sl28cpld_gpio_probe,
	.driver = {
		.name = "sl28cpld-gpio",
		.of_match_table = sl28cpld_gpio_of_match,
	},
};
module_platform_driver(sl28cpld_gpio_driver);

MODULE_DESCRIPTION("sl28cpld GPIO Driver");
MODULE_AUTHOR("Michael Walle <[email protected]>");
MODULE_LICENSE("GPL");
Commit	Line	Data
b7536d87 MW	1	// SPDX-License-Identifier: GPL-2.0-only
	2	/*
	3	* sl28cpld GPIO driver
	4	*
	5	* Copyright 2020 Michael Walle <[email protected]>
	6	*/
	7
	8	#include <linux/device.h>
	9	#include <linux/gpio/driver.h>
	10	#include <linux/gpio/regmap.h>
	11	#include <linux/interrupt.h>
	12	#include <linux/kernel.h>
	13	#include <linux/mod_devicetable.h>
	14	#include <linux/module.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/regmap.h>
	17
	18	/* GPIO flavor */
	19	#define GPIO_REG_DIR 0x00
	20	#define GPIO_REG_OUT 0x01
	21	#define GPIO_REG_IN 0x02
	22	#define GPIO_REG_IE 0x03
	23	#define GPIO_REG_IP 0x04
	24
	25	/* input-only flavor */
	26	#define GPI_REG_IN 0x00
	27
	28	/* output-only flavor */
	29	#define GPO_REG_OUT 0x00
	30
	31	enum sl28cpld_gpio_type {
	32	SL28CPLD_GPIO = 1,
	33	SL28CPLD_GPI,
	34	SL28CPLD_GPO,
	35	};
	36
	37	static const struct regmap_irq sl28cpld_gpio_irqs[] = {
	38	REGMAP_IRQ_REG_LINE(0, 8),
	39	REGMAP_IRQ_REG_LINE(1, 8),
	40	REGMAP_IRQ_REG_LINE(2, 8),
	41	REGMAP_IRQ_REG_LINE(3, 8),
	42	REGMAP_IRQ_REG_LINE(4, 8),
	43	REGMAP_IRQ_REG_LINE(5, 8),
	44	REGMAP_IRQ_REG_LINE(6, 8),
	45	REGMAP_IRQ_REG_LINE(7, 8),
	46	};
	47
	48	static int sl28cpld_gpio_irq_init(struct platform_device *pdev,
	49	unsigned int base,
	50	struct gpio_regmap_config *config)
	51	{
	52	struct regmap_irq_chip_data *irq_data;
	53	struct regmap_irq_chip *irq_chip;
	54	struct device *dev = &pdev->dev;
	55	int irq, ret;
	56
	57	if (!device_property_read_bool(dev, "interrupt-controller"))
	58	return 0;
	59
	60	irq = platform_get_irq(pdev, 0);
	61	if (irq < 0)
	62	return irq;
	63
	64	irq_chip = devm_kzalloc(dev, sizeof(*irq_chip), GFP_KERNEL);
65	if (!irq_chip)
66	return -ENOMEM;
67
68	irq_chip->name = "sl28cpld-gpio-irq",
69	irq_chip->irqs = sl28cpld_gpio_irqs;
70	irq_chip->num_irqs = ARRAY_SIZE(sl28cpld_gpio_irqs);
71	irq_chip->num_regs = 1;
72	irq_chip->status_base = base + GPIO_REG_IP;
73	irq_chip->mask_base = base + GPIO_REG_IE;
74	irq_chip->mask_invert = true,
75	irq_chip->ack_base = base + GPIO_REG_IP;
76
77	ret = devm_regmap_add_irq_chip_fwnode(dev, dev_fwnode(dev),
78	config->regmap, irq,
79	IRQF_SHARED \| IRQF_ONESHOT,
80	0, irq_chip, &irq_data);
81	if (ret)
82	return ret;
83
84	config->irq_domain = regmap_irq_get_domain(irq_data);
85
86	return 0;
87	}
88
89	static int sl28cpld_gpio_probe(struct platform_device *pdev)
90	{
91	struct gpio_regmap_config config = {0};
92	enum sl28cpld_gpio_type type;
93	struct regmap *regmap;
94	u32 base;
95	int ret;
96
97	if (!pdev->dev.parent)
98	return -ENODEV;
99
100	type = (uintptr_t)device_get_match_data(&pdev->dev);
101	if (!type)
102	return -ENODEV;
103
104	ret = device_property_read_u32(&pdev->dev, "reg", &base);
105	if (ret)
106	return -EINVAL;
107
108	regmap = dev_get_regmap(pdev->dev.parent, NULL);
109	if (!regmap)
110	return -ENODEV;
111
112	config.regmap = regmap;
113	config.parent = &pdev->dev;
114	config.ngpio = 8;
115
116	switch (type) {
117	case SL28CPLD_GPIO:
118	config.reg_dat_base = base + GPIO_REG_IN;
119	config.reg_set_base = base + GPIO_REG_OUT;
120	/* reg_dir_out_base might be zero */
121	config.reg_dir_out_base = GPIO_REGMAP_ADDR(base + GPIO_REG_DIR);
122
123	/* This type supports interrupts */
124	ret = sl28cpld_gpio_irq_init(pdev, base, &config);
125	if (ret)
126	return ret;
127	break;
128	case SL28CPLD_GPO:
129	config.reg_set_base = base + GPO_REG_OUT;
130	break;
131	case SL28CPLD_GPI:
132	config.reg_dat_base = base + GPI_REG_IN;
133	break;
134	default:
135	dev_err(&pdev->dev, "unknown type %d\n", type);
136	return -ENODEV;
137	}
138
139	return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config));
140	}
141
142	static const struct of_device_id sl28cpld_gpio_of_match[] = {
143	{ .compatible = "kontron,sl28cpld-gpio", .data = (void *)SL28CPLD_GPIO },
144	{ .compatible = "kontron,sl28cpld-gpi", .data = (void *)SL28CPLD_GPI },
145	{ .compatible = "kontron,sl28cpld-gpo", .data = (void *)SL28CPLD_GPO },
146	{}
147	};
148	MODULE_DEVICE_TABLE(of, sl28cpld_gpio_of_match);
149
150	static struct platform_driver sl28cpld_gpio_driver = {
151	.probe = sl28cpld_gpio_probe,
152	.driver = {
153	.name = "sl28cpld-gpio",
154	.of_match_table = sl28cpld_gpio_of_match,
155	},
156	};
157	module_platform_driver(sl28cpld_gpio_driver);
158
159	MODULE_DESCRIPTION("sl28cpld GPIO Driver");
160	MODULE_AUTHOR("Michael Walle <[email protected]>");
161	MODULE_LICENSE("GPL");