[deliverable/linux.git] / drivers / input / serio / altera_ps2.c

/*
 * 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
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

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