[net-next-2.6.git] / drivers / input / mouse / pxa930_trkball.c

/*
 * PXA930 track ball mouse driver
 *
 * Copyright (C) 2007 Marvell International Ltd.
 * 2008-02-28: Yong Yao <yaoyong@marvell.com>
 *             initial version
 *
 *  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/init.h>
#include <linux/input.h>
#include <linux/version.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/slab.h>

#include <mach/hardware.h>
#include <mach/pxa930_trkball.h>

/* Trackball Controller Register Definitions */
#define TBCR		(0x000C)
#define TBCNTR		(0x0010)
#define TBSBC		(0x0014)

#define TBCR_TBRST	(1 << 1)
#define TBCR_TBSB	(1 << 10)

#define TBCR_Y_FLT(n)	(((n) & 0xf) << 6)
#define TBCR_X_FLT(n)	(((n) & 0xf) << 2)

#define TBCNTR_YM(n)	(((n) >> 24) & 0xff)
#define TBCNTR_YP(n)	(((n) >> 16) & 0xff)
#define TBCNTR_XM(n)	(((n) >> 8) & 0xff)
#define TBCNTR_XP(n)	((n) & 0xff)

#define TBSBC_TBSBC	(0x1)

struct pxa930_trkball {
	struct pxa930_trkball_platform_data *pdata;

	/* Memory Mapped Register */
	struct resource *mem;
	void __iomem *mmio_base;

	struct input_dev *input;
};

static irqreturn_t pxa930_trkball_interrupt(int irq, void *dev_id)
{
	struct pxa930_trkball *trkball = dev_id;
	struct input_dev *input = trkball->input;
	int tbcntr, x, y;

	/* According to the spec software must read TBCNTR twice:
	 * if the read value is the same, the reading is valid
	 */
	tbcntr = __raw_readl(trkball->mmio_base + TBCNTR);

	if (tbcntr == __raw_readl(trkball->mmio_base + TBCNTR)) {
		x = (TBCNTR_XP(tbcntr) - TBCNTR_XM(tbcntr)) / 2;
		y = (TBCNTR_YP(tbcntr) - TBCNTR_YM(tbcntr)) / 2;

		input_report_rel(input, REL_X, x);
		input_report_rel(input, REL_Y, y);
		input_sync(input);
	}

	__raw_writel(TBSBC_TBSBC, trkball->mmio_base + TBSBC);
	__raw_writel(0, trkball->mmio_base + TBSBC);

	return IRQ_HANDLED;
}

/* For TBCR, we need to wait for a while to make sure it has been modified. */
static int write_tbcr(struct pxa930_trkball *trkball, int v)
{
	int i = 100;

	__raw_writel(v, trkball->mmio_base + TBCR);

	while (--i) {
		if (__raw_readl(trkball->mmio_base + TBCR) == v)
			break;
		msleep(1);
	}

	if (i == 0) {
		pr_err("%s: timed out writing TBCR(%x)!\n", __func__, v);
		return -ETIMEDOUT;
	}

	return 0;
}

static void pxa930_trkball_config(struct pxa930_trkball *trkball)
{
	uint32_t tbcr;

	/* According to spec, need to write the filters of x,y to 0xf first! */
	tbcr = __raw_readl(trkball->mmio_base + TBCR);
	write_tbcr(trkball, tbcr | TBCR_X_FLT(0xf) | TBCR_Y_FLT(0xf));
	write_tbcr(trkball, TBCR_X_FLT(trkball->pdata->x_filter) |
			    TBCR_Y_FLT(trkball->pdata->y_filter));

	/* According to spec, set TBCR_TBRST first, before clearing it! */
	tbcr = __raw_readl(trkball->mmio_base + TBCR);
	write_tbcr(trkball, tbcr | TBCR_TBRST);
	write_tbcr(trkball, tbcr & ~TBCR_TBRST);

	__raw_writel(TBSBC_TBSBC, trkball->mmio_base + TBSBC);
	__raw_writel(0, trkball->mmio_base + TBSBC);

	pr_debug("%s: final TBCR=%x!\n", __func__,
		 __raw_readl(trkball->mmio_base + TBCR));
}

static int pxa930_trkball_open(struct input_dev *dev)
{
	struct pxa930_trkball *trkball = input_get_drvdata(dev);

	pxa930_trkball_config(trkball);

	return 0;
}

static void pxa930_trkball_disable(struct pxa930_trkball *trkball)
{
	uint32_t tbcr = __raw_readl(trkball->mmio_base + TBCR);

	/* Held in reset, gate the 32-KHz input clock off */
	write_tbcr(trkball, tbcr | TBCR_TBRST);
}

static void pxa930_trkball_close(struct input_dev *dev)
{
	struct pxa930_trkball *trkball = input_get_drvdata(dev);

	pxa930_trkball_disable(trkball);
}

static int __devinit pxa930_trkball_probe(struct platform_device *pdev)
{
	struct pxa930_trkball *trkball;
	struct input_dev *input;
	struct resource *res;
	int irq, error;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(&pdev->dev, "failed to get trkball irq\n");
		return -ENXIO;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "failed to get register memory\n");
		return -ENXIO;
	}

	trkball = kzalloc(sizeof(struct pxa930_trkball), GFP_KERNEL);
	if (!trkball)
		return -ENOMEM;

	trkball->pdata = pdev->dev.platform_data;
	if (!trkball->pdata) {
		dev_err(&pdev->dev, "no platform data defined\n");
		error = -EINVAL;
		goto failed;
	}

	trkball->mmio_base = ioremap_nocache(res->start, resource_size(res));
	if (!trkball->mmio_base) {
		dev_err(&pdev->dev, "failed to ioremap registers\n");
		error = -ENXIO;
		goto failed;
	}

	/* held the module in reset, will be enabled in open() */
	pxa930_trkball_disable(trkball);

	error = request_irq(irq, pxa930_trkball_interrupt, IRQF_DISABLED,
			    pdev->name, trkball);
	if (error) {
		dev_err(&pdev->dev, "failed to request irq: %d\n", error);
		goto failed_free_io;
	}

	platform_set_drvdata(pdev, trkball);

	input = input_allocate_device();
	if (!input) {
		dev_err(&pdev->dev, "failed to allocate input device\n");
		error = -ENOMEM;
		goto failed_free_irq;
	}

	input->name = pdev->name;
	input->id.bustype = BUS_HOST;
	input->open = pxa930_trkball_open;
	input->close = pxa930_trkball_close;
	input->dev.parent = &pdev->dev;
	input_set_drvdata(input, trkball);

	trkball->input = input;

	input_set_capability(input, EV_REL, REL_X);
	input_set_capability(input, EV_REL, REL_Y);

	error = input_register_device(input);
	if (error) {
		dev_err(&pdev->dev, "unable to register input device\n");
		goto failed_free_input;
	}

	return 0;

failed_free_input:
	input_free_device(input);
failed_free_irq:
	free_irq(irq, trkball);
failed_free_io:
	iounmap(trkball->mmio_base);
failed:
	kfree(trkball);
	return error;
}

static int __devexit pxa930_trkball_remove(struct platform_device *pdev)
{
	struct pxa930_trkball *trkball = platform_get_drvdata(pdev);
	int irq = platform_get_irq(pdev, 0);

	input_unregister_device(trkball->input);
	free_irq(irq, trkball);
	iounmap(trkball->mmio_base);
	kfree(trkball);

	return 0;
}

static struct platform_driver pxa930_trkball_driver = {
	.driver		= {
		.name	= "pxa930-trkball",
	},
	.probe		= pxa930_trkball_probe,
	.remove		= __devexit_p(pxa930_trkball_remove),
};

static int __init pxa930_trkball_init(void)
{
	return platform_driver_register(&pxa930_trkball_driver);
}

static void __exit pxa930_trkball_exit(void)
{
	platform_driver_unregister(&pxa930_trkball_driver);
}

module_init(pxa930_trkball_init);
module_exit(pxa930_trkball_exit);

MODULE_AUTHOR("Yong Yao <yaoyong@marvell.com>");
MODULE_DESCRIPTION("PXA930 Trackball Mouse Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
105ca239 YY	1	/*
	2	* PXA930 track ball mouse driver
	3	*
	4	* Copyright (C) 2007 Marvell International Ltd.
	5	* 2008-02-28: Yong Yao <yaoyong@marvell.com>
	6	* initial version
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/init.h>
	14	#include <linux/input.h>
	15	#include <linux/version.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/module.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/delay.h>
	20	#include <linux/io.h>
5a0e3ad6	21	#include <linux/slab.h>
105ca239 YY	22
	23	#include <mach/hardware.h>
	24	#include <mach/pxa930_trkball.h>
	25
	26	/* Trackball Controller Register Definitions */
	27	#define TBCR (0x000C)
	28	#define TBCNTR (0x0010)
	29	#define TBSBC (0x0014)
	30
	31	#define TBCR_TBRST (1 << 1)
	32	#define TBCR_TBSB (1 << 10)
	33
	34	#define TBCR_Y_FLT(n) (((n) & 0xf) << 6)
	35	#define TBCR_X_FLT(n) (((n) & 0xf) << 2)
	36
	37	#define TBCNTR_YM(n) (((n) >> 24) & 0xff)
	38	#define TBCNTR_YP(n) (((n) >> 16) & 0xff)
	39	#define TBCNTR_XM(n) (((n) >> 8) & 0xff)
	40	#define TBCNTR_XP(n) ((n) & 0xff)
	41
	42	#define TBSBC_TBSBC (0x1)
	43
	44	struct pxa930_trkball {
	45	struct pxa930_trkball_platform_data *pdata;
	46
	47	/* Memory Mapped Register */
	48	struct resource *mem;
	49	void __iomem *mmio_base;
	50
	51	struct input_dev *input;
	52	};
	53
	54	static irqreturn_t pxa930_trkball_interrupt(int irq, void *dev_id)
	55	{
	56	struct pxa930_trkball *trkball = dev_id;
	57	struct input_dev *input = trkball->input;
	58	int tbcntr, x, y;
	59
	60	/* According to the spec software must read TBCNTR twice:
	61	* if the read value is the same, the reading is valid
	62	*/
	63	tbcntr = __raw_readl(trkball->mmio_base + TBCNTR);
	64
	65	if (tbcntr == __raw_readl(trkball->mmio_base + TBCNTR)) {
	66	x = (TBCNTR_XP(tbcntr) - TBCNTR_XM(tbcntr)) / 2;
	67	y = (TBCNTR_YP(tbcntr) - TBCNTR_YM(tbcntr)) / 2;
	68
	69	input_report_rel(input, REL_X, x);
	70	input_report_rel(input, REL_Y, y);
	71	input_sync(input);
	72	}
	73
	74	__raw_writel(TBSBC_TBSBC, trkball->mmio_base + TBSBC);
	75	__raw_writel(0, trkball->mmio_base + TBSBC);
	76
	77	return IRQ_HANDLED;
	78	}
	79
	80	/* For TBCR, we need to wait for a while to make sure it has been modified. */
	81	static int write_tbcr(struct pxa930_trkball *trkball, int v)
	82	{
	83	int i = 100;
	84
	85	__raw_writel(v, trkball->mmio_base + TBCR);
86
bc34496d	87	while (--i) {
105ca239 YY	88	if (__raw_readl(trkball->mmio_base + TBCR) == v)
	89	break;
	90	msleep(1);
	91	}
	92
	93	if (i == 0) {
	94	pr_err("%s: timed out writing TBCR(%x)!\n", __func__, v);
	95	return -ETIMEDOUT;
	96	}
	97
	98	return 0;
	99	}
	100
	101	static void pxa930_trkball_config(struct pxa930_trkball *trkball)
	102	{
	103	uint32_t tbcr;
	104
	105	/* According to spec, need to write the filters of x,y to 0xf first! */
	106	tbcr = __raw_readl(trkball->mmio_base + TBCR);
	107	write_tbcr(trkball, tbcr \| TBCR_X_FLT(0xf) \| TBCR_Y_FLT(0xf));
	108	write_tbcr(trkball, TBCR_X_FLT(trkball->pdata->x_filter) \|
	109	TBCR_Y_FLT(trkball->pdata->y_filter));
	110
	111	/* According to spec, set TBCR_TBRST first, before clearing it! */
	112	tbcr = __raw_readl(trkball->mmio_base + TBCR);
	113	write_tbcr(trkball, tbcr \| TBCR_TBRST);
	114	write_tbcr(trkball, tbcr & ~TBCR_TBRST);
	115
	116	__raw_writel(TBSBC_TBSBC, trkball->mmio_base + TBSBC);
	117	__raw_writel(0, trkball->mmio_base + TBSBC);
	118
	119	pr_debug("%s: final TBCR=%x!\n", __func__,
	120	__raw_readl(trkball->mmio_base + TBCR));
	121	}
	122
	123	static int pxa930_trkball_open(struct input_dev *dev)
	124	{
	125	struct pxa930_trkball *trkball = input_get_drvdata(dev);
	126
	127	pxa930_trkball_config(trkball);
	128
	129	return 0;
	130	}
	131
	132	static void pxa930_trkball_disable(struct pxa930_trkball *trkball)
	133	{
	134	uint32_t tbcr = __raw_readl(trkball->mmio_base + TBCR);
	135
	136	/* Held in reset, gate the 32-KHz input clock off */
	137	write_tbcr(trkball, tbcr \| TBCR_TBRST);
	138	}
	139
	140	static void pxa930_trkball_close(struct input_dev *dev)
	141	{
	142	struct pxa930_trkball *trkball = input_get_drvdata(dev);
	143
	144	pxa930_trkball_disable(trkball);
	145	}
	146
	147	static int __devinit pxa930_trkball_probe(struct platform_device *pdev)
	148	{
	149	struct pxa930_trkball *trkball;
	150	struct input_dev *input;
	151	struct resource *res;
152	int irq, error;
153
154	irq = platform_get_irq(pdev, 0);
155	if (irq < 0) {
156	dev_err(&pdev->dev, "failed to get trkball irq\n");
157	return -ENXIO;
158	}
159
160	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
161	if (!res) {
162	dev_err(&pdev->dev, "failed to get register memory\n");
163	return -ENXIO;
164	}
165
166	trkball = kzalloc(sizeof(struct pxa930_trkball), GFP_KERNEL);
167	if (!trkball)
168	return -ENOMEM;
169
170	trkball->pdata = pdev->dev.platform_data;
171	if (!trkball->pdata) {
172	dev_err(&pdev->dev, "no platform data defined\n");
173	error = -EINVAL;
174	goto failed;
175	}
176
177	trkball->mmio_base = ioremap_nocache(res->start, resource_size(res));
178	if (!trkball->mmio_base) {
179	dev_err(&pdev->dev, "failed to ioremap registers\n");
180	error = -ENXIO;
181	goto failed;
182	}
183
184	/* held the module in reset, will be enabled in open() */
185	pxa930_trkball_disable(trkball);
186
187	error = request_irq(irq, pxa930_trkball_interrupt, IRQF_DISABLED,
188	pdev->name, trkball);
189	if (error) {
d8f2f180	190	dev_err(&pdev->dev, "failed to request irq: %d\n", error);
105ca239 YY	191	goto failed_free_io;
	192	}
	193
	194	platform_set_drvdata(pdev, trkball);
	195
	196	input = input_allocate_device();
	197	if (!input) {
	198	dev_err(&pdev->dev, "failed to allocate input device\n");
	199	error = -ENOMEM;
	200	goto failed_free_irq;
	201	}
	202
	203	input->name = pdev->name;
	204	input->id.bustype = BUS_HOST;
	205	input->open = pxa930_trkball_open;
	206	input->close = pxa930_trkball_close;
	207	input->dev.parent = &pdev->dev;
	208	input_set_drvdata(input, trkball);
	209
	210	trkball->input = input;
	211
	212	input_set_capability(input, EV_REL, REL_X);
	213	input_set_capability(input, EV_REL, REL_Y);
	214
	215	error = input_register_device(input);
	216	if (error) {
	217	dev_err(&pdev->dev, "unable to register input device\n");
	218	goto failed_free_input;
	219	}
	220
	221	return 0;
	222
	223	failed_free_input:
	224	input_free_device(input);
	225	failed_free_irq:
	226	free_irq(irq, trkball);
	227	failed_free_io:
	228	iounmap(trkball->mmio_base);
	229	failed:
	230	kfree(trkball);
d8f2f180	231	return error;
105ca239 YY	232	}
	233
	234	static int __devexit pxa930_trkball_remove(struct platform_device *pdev)
	235	{
	236	struct pxa930_trkball *trkball = platform_get_drvdata(pdev);
	237	int irq = platform_get_irq(pdev, 0);
	238
	239	input_unregister_device(trkball->input);
	240	free_irq(irq, trkball);
	241	iounmap(trkball->mmio_base);
	242	kfree(trkball);
	243
	244	return 0;
	245	}
	246
	247	static struct platform_driver pxa930_trkball_driver = {
	248	.driver = {
	249	.name = "pxa930-trkball",
	250	},
	251	.probe = pxa930_trkball_probe,
	252	.remove = __devexit_p(pxa930_trkball_remove),
	253	};
	254
	255	static int __init pxa930_trkball_init(void)
	256	{
	257	return platform_driver_register(&pxa930_trkball_driver);
	258	}
	259
	260	static void __exit pxa930_trkball_exit(void)
	261	{
	262	platform_driver_unregister(&pxa930_trkball_driver);
	263	}
	264
	265	module_init(pxa930_trkball_init);
	266	module_exit(pxa930_trkball_exit);
	267
	268	MODULE_AUTHOR("Yong Yao <yaoyong@marvell.com>");
	269	MODULE_DESCRIPTION("PXA930 Trackball Mouse Driver");
	270	MODULE_LICENSE("GPL");