[linux-block.git] / drivers / input / serio / altera_ps2.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Altera University Program PS2 controller driver
 *
 * Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
 *
 * Based on sa1111ps2.c, which is:
 * Copyright (C) 2002 Russell King
 */

#include <linux/module.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/of.h>

#define DRV_NAME "altera_ps2"

struct ps2if {
	struct serio *io;
	void __iomem *base;
};

/*
 * Read all bytes waiting in the PS2 port.  There should be
 * at the most one, but we loop for safety.
 */
static irqreturn_t altera_ps2_rxint(int irq, void *dev_id)
{
	struct ps2if *ps2if = dev_id;
	unsigned int status;
	irqreturn_t handled = IRQ_NONE;

	while ((status = readl(ps2if->base)) & 0xffff0000) {
		serio_interrupt(ps2if->io, status & 0xff, 0);
		handled = IRQ_HANDLED;
	}

	return handled;
}

/*
 * Write a byte to the PS2 port.
 */
static int altera_ps2_write(struct serio *io, unsigned char val)
{
	struct ps2if *ps2if = io->port_data;

	writel(val, ps2if->base);
	return 0;
}

static int altera_ps2_open(struct serio *io)
{
	struct ps2if *ps2if = io->port_data;

	/* clear fifo */
	while (readl(ps2if->base) & 0xffff0000)
		/* empty */;

	writel(1, ps2if->base + 4); /* enable rx irq */
	return 0;
}

static void altera_ps2_close(struct serio *io)
{
	struct ps2if *ps2if = io->port_data;

	writel(0, ps2if->base + 4); /* disable rx irq */
}

/*
 * Add one device to this driver.
 */
static int altera_ps2_probe(struct platform_device *pdev)
{
	struct ps2if *ps2if;
	struct resource *res;
	struct serio *serio;
	int error, irq;

	ps2if = devm_kzalloc(&pdev->dev, sizeof(struct ps2if), GFP_KERNEL);
	if (!ps2if)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	ps2if->base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(ps2if->base))
		return PTR_ERR(ps2if->base);

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

	error = devm_request_irq(&pdev->dev, irq, altera_ps2_rxint, 0,
				 pdev->name, ps2if);
	if (error) {
		dev_err(&pdev->dev, "could not request IRQ %d\n", irq);
		return error;
	}

	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
	if (!serio)
		return -ENOMEM;

	serio->id.type		= SERIO_8042;
	serio->write		= altera_ps2_write;
	serio->open		= altera_ps2_open;
	serio->close		= altera_ps2_close;
	strscpy(serio->name, dev_name(&pdev->dev), sizeof(serio->name));
	strscpy(serio->phys, dev_name(&pdev->dev), sizeof(serio->phys));
	serio->port_data	= ps2if;
	serio->dev.parent	= &pdev->dev;
	ps2if->io		= serio;

	dev_info(&pdev->dev, "base %p, irq %d\n", ps2if->base, irq);

	serio_register_port(ps2if->io);
	platform_set_drvdata(pdev, ps2if);

	return 0;
}

/*
 * Remove one device from this driver.
 */
static int altera_ps2_remove(struct platform_device *pdev)
{
	struct ps2if *ps2if = platform_get_drvdata(pdev);

	serio_unregister_port(ps2if->io);

	return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id altera_ps2_match[] = {
	{ .compatible = "ALTR,ps2-1.0", },
	{ .compatible = "altr,ps2-1.0", },
	{},
};
MODULE_DEVICE_TABLE(of, altera_ps2_match);
#endif /* CONFIG_OF */

/*
 * Our device driver structure
 */
static struct platform_driver altera_ps2_driver = {
	.probe		= altera_ps2_probe,
	.remove		= altera_ps2_remove,
	.driver	= {
		.name	= DRV_NAME,
		.of_match_table = of_match_ptr(altera_ps2_match),
	},
};
module_platform_driver(altera_ps2_driver);

MODULE_DESCRIPTION("Altera University Program PS2 controller driver");
MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
fb5bbee0 TC	2	/*
	3	* Altera University Program PS2 controller driver
	4	*
	5	* Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
	6	*
	7	* Based on sa1111ps2.c, which is:
	8	* Copyright (C) 2002 Russell King
fb5bbee0 TC	9	*/
	10
	11	#include <linux/module.h>
fb5bbee0 TC	12	#include <linux/input.h>
	13	#include <linux/serio.h>
	14	#include <linux/interrupt.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/io.h>
5a0e3ad6	17	#include <linux/slab.h>
0bfd95a2	18	#include <linux/of.h>
fb5bbee0 TC	19
	20	#define DRV_NAME "altera_ps2"
	21
	22	struct ps2if {
	23	struct serio *io;
fb5bbee0	24	void __iomem *base;
fb5bbee0 TC	25	};
	26
	27	/*
	28	* Read all bytes waiting in the PS2 port. There should be
	29	* at the most one, but we loop for safety.
	30	*/
	31	static irqreturn_t altera_ps2_rxint(int irq, void *dev_id)
	32	{
	33	struct ps2if *ps2if = dev_id;
	34	unsigned int status;
5f77fc45	35	irqreturn_t handled = IRQ_NONE;
fb5bbee0 TC	36
	37	while ((status = readl(ps2if->base)) & 0xffff0000) {
	38	serio_interrupt(ps2if->io, status & 0xff, 0);
	39	handled = IRQ_HANDLED;
	40	}
	41
	42	return handled;
	43	}
	44
	45	/*
	46	* Write a byte to the PS2 port.
	47	*/
	48	static int altera_ps2_write(struct serio *io, unsigned char val)
	49	{
	50	struct ps2if *ps2if = io->port_data;
	51
	52	writel(val, ps2if->base);
	53	return 0;
	54	}
	55
	56	static int altera_ps2_open(struct serio *io)
	57	{
	58	struct ps2if *ps2if = io->port_data;
	59
	60	/* clear fifo */
	61	while (readl(ps2if->base) & 0xffff0000)
	62	/* empty */;
	63
	64	writel(1, ps2if->base + 4); /* enable rx irq */
	65	return 0;
	66	}
	67
	68	static void altera_ps2_close(struct serio *io)
	69	{
	70	struct ps2if *ps2if = io->port_data;
	71
d0269b84	72	writel(0, ps2if->base + 4); /* disable rx irq */
fb5bbee0 TC	73	}
	74
	75	/*
	76	* Add one device to this driver.
	77	*/
5298cc4c	78	static int altera_ps2_probe(struct platform_device *pdev)
fb5bbee0 TC	79	{
fb5bbee0 TC	80	struct ps2if *ps2if;
a823c267	81	struct resource *res;
fb5bbee0	82	struct serio *serio;
909275bc	83	int error, irq;
fb5bbee0	84
a823c267 TK	85	ps2if = devm_kzalloc(&pdev->dev, sizeof(struct ps2if), GFP_KERNEL);
	86	if (!ps2if)
	87	return -ENOMEM;
	88
	89	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	90	ps2if->base = devm_ioremap_resource(&pdev->dev, res);
	91	if (IS_ERR(ps2if->base))
	92	return PTR_ERR(ps2if->base);
	93
	94	irq = platform_get_irq(pdev, 0);
	95	if (irq < 0)
	96	return -ENXIO;
	97
	98	error = devm_request_irq(&pdev->dev, irq, altera_ps2_rxint, 0,
	99	pdev->name, ps2if);
	100	if (error) {
	101	dev_err(&pdev->dev, "could not request IRQ %d\n", irq);
	102	return error;
fb5bbee0 TC	103	}
fb5bbee0 TC	104
a823c267 TK	105	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
	106	if (!serio)
	107	return -ENOMEM;
	108
fb5bbee0 TC	109	serio->id.type = SERIO_8042;
	110	serio->write = altera_ps2_write;
	111	serio->open = altera_ps2_open;
	112	serio->close = altera_ps2_close;
a9f08ad7 WS	113	strscpy(serio->name, dev_name(&pdev->dev), sizeof(serio->name));
a9f08ad7 WS	114	strscpy(serio->phys, dev_name(&pdev->dev), sizeof(serio->phys));
fb5bbee0 TC	115	serio->port_data = ps2if;
	116	serio->dev.parent = &pdev->dev;
	117	ps2if->io = serio;
	118
a823c267	119	dev_info(&pdev->dev, "base %p, irq %d\n", ps2if->base, irq);
fb5bbee0 TC	120
	121	serio_register_port(ps2if->io);
	122	platform_set_drvdata(pdev, ps2if);
	123
	124	return 0;
fb5bbee0 TC	125	}
	126
	127	/*
	128	* Remove one device from this driver.
	129	*/
e2619cf7	130	static int altera_ps2_remove(struct platform_device *pdev)
fb5bbee0 TC	131	{
	132	struct ps2if *ps2if = platform_get_drvdata(pdev);
	133
fb5bbee0	134	serio_unregister_port(ps2if->io);
fb5bbee0 TC	135
	136	return 0;
	137	}
	138
0bfd95a2 WG	139	#ifdef CONFIG_OF
	140	static const struct of_device_id altera_ps2_match[] = {
	141	{ .compatible = "ALTR,ps2-1.0", },
13960b47	142	{ .compatible = "altr,ps2-1.0", },
0bfd95a2 WG	143	{},
	144	};
	145	MODULE_DEVICE_TABLE(of, altera_ps2_match);
0bfd95a2 WG	146	#endif /* CONFIG_OF */
0bfd95a2 WG	147
fb5bbee0 TC	148	/*
	149	* Our device driver structure
	150	*/
	151	static struct platform_driver altera_ps2_driver = {
	152	.probe = altera_ps2_probe,
1cb0aa88	153	.remove = altera_ps2_remove,
fb5bbee0 TC	154	.driver = {
fb5bbee0 TC	155	.name = DRV_NAME,
14b5842e	156	.of_match_table = of_match_ptr(altera_ps2_match),
fb5bbee0 TC	157	},
fb5bbee0 TC	158	};
24d2469a	159	module_platform_driver(altera_ps2_driver);
fb5bbee0 TC	160
	161	MODULE_DESCRIPTION("Altera University Program PS2 controller driver");
	162	MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
	163	MODULE_LICENSE("GPL");
	164	MODULE_ALIAS("platform:" DRV_NAME);