[deliverable/linux.git] / drivers / input / keyboard / pxa930_rotary.c

/*
 * Driver for the enhanced rotary controller on pxa930 and pxa935
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/slab.h>

#include <linux/platform_data/keyboard-pxa930_rotary.h>

#define SBCR	(0x04)
#define ERCR	(0x0c)

#define SBCR_ERSB	(1 << 5)

struct pxa930_rotary {
	struct input_dev	*input_dev;
	void __iomem		*mmio_base;
	int			last_ercr;

	struct pxa930_rotary_platform_data *pdata;
};

static void clear_sbcr(struct pxa930_rotary *r)
{
	uint32_t sbcr = __raw_readl(r->mmio_base + SBCR);

	__raw_writel(sbcr | SBCR_ERSB, r->mmio_base + SBCR);
	__raw_writel(sbcr & ~SBCR_ERSB, r->mmio_base + SBCR);
}

static irqreturn_t rotary_irq(int irq, void *dev_id)
{
	struct pxa930_rotary *r = dev_id;
	struct pxa930_rotary_platform_data *pdata = r->pdata;
	int ercr, delta, key;

	ercr = __raw_readl(r->mmio_base + ERCR) & 0xf;
	clear_sbcr(r);

	delta = ercr - r->last_ercr;
	if (delta == 0)
		return IRQ_HANDLED;

	r->last_ercr = ercr;

	if (pdata->up_key && pdata->down_key) {
		key = (delta > 0) ? pdata->up_key : pdata->down_key;
		input_report_key(r->input_dev, key, 1);
		input_sync(r->input_dev);
		input_report_key(r->input_dev, key, 0);
	} else
		input_report_rel(r->input_dev, pdata->rel_code, delta);

	input_sync(r->input_dev);

	return IRQ_HANDLED;
}

static int pxa930_rotary_open(struct input_dev *dev)
{
	struct pxa930_rotary *r = input_get_drvdata(dev);

	clear_sbcr(r);

	return 0;
}

static void pxa930_rotary_close(struct input_dev *dev)
{
	struct pxa930_rotary *r = input_get_drvdata(dev);

	clear_sbcr(r);
}

static int pxa930_rotary_probe(struct platform_device *pdev)
{
	struct pxa930_rotary_platform_data *pdata =
			dev_get_platdata(&pdev->dev);
	struct pxa930_rotary *r;
	struct input_dev *input_dev;
	struct resource *res;
	int irq;
	int err;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(&pdev->dev, "no irq for rotary controller\n");
		return -ENXIO;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "no I/O memory defined\n");
		return -ENXIO;
	}

	if (!pdata) {
		dev_err(&pdev->dev, "no platform data defined\n");
		return -EINVAL;
	}

	r = kzalloc(sizeof(struct pxa930_rotary), GFP_KERNEL);
	if (!r)
		return -ENOMEM;

	r->mmio_base = ioremap_nocache(res->start, resource_size(res));
	if (r->mmio_base == NULL) {
		dev_err(&pdev->dev, "failed to remap IO memory\n");
		err = -ENXIO;
		goto failed_free;
	}

	r->pdata = pdata;
	platform_set_drvdata(pdev, r);

	/* allocate and register the input device */
	input_dev = input_allocate_device();
	if (!input_dev) {
		dev_err(&pdev->dev, "failed to allocate input device\n");
		err = -ENOMEM;
		goto failed_free_io;
	}

	input_dev->name = pdev->name;
	input_dev->id.bustype = BUS_HOST;
	input_dev->open = pxa930_rotary_open;
	input_dev->close = pxa930_rotary_close;
	input_dev->dev.parent = &pdev->dev;

	if (pdata->up_key && pdata->down_key) {
		__set_bit(pdata->up_key, input_dev->keybit);
		__set_bit(pdata->down_key, input_dev->keybit);
		__set_bit(EV_KEY, input_dev->evbit);
	} else {
		__set_bit(pdata->rel_code, input_dev->relbit);
		__set_bit(EV_REL, input_dev->evbit);
	}

	r->input_dev = input_dev;
	input_set_drvdata(input_dev, r);

	err = request_irq(irq, rotary_irq, 0,
			"enhanced rotary", r);
	if (err) {
		dev_err(&pdev->dev, "failed to request IRQ\n");
		goto failed_free_input;
	}

	err = input_register_device(input_dev);
	if (err) {
		dev_err(&pdev->dev, "failed to register input device\n");
		goto failed_free_irq;
	}

	return 0;

failed_free_irq:
	free_irq(irq, r);
failed_free_input:
	input_free_device(input_dev);
failed_free_io:
	iounmap(r->mmio_base);
failed_free:
	kfree(r);
	return err;
}

static int pxa930_rotary_remove(struct platform_device *pdev)
{
	struct pxa930_rotary *r = platform_get_drvdata(pdev);

	free_irq(platform_get_irq(pdev, 0), r);
	input_unregister_device(r->input_dev);
	iounmap(r->mmio_base);
	kfree(r);

	return 0;
}

static struct platform_driver pxa930_rotary_driver = {
	.driver		= {
		.name	= "pxa930-rotary",
	},
	.probe		= pxa930_rotary_probe,
	.remove		= pxa930_rotary_remove,
};
module_platform_driver(pxa930_rotary_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Driver for PXA93x Enhanced Rotary Controller");
MODULE_AUTHOR("Yao Yong <yaoyong@marvell.com>");
Commit	Line	Data
e0ee6298 YY	1	/*
	2	* Driver for the enhanced rotary controller on pxa930 and pxa935
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8
	9	#include <linux/kernel.h>
	10	#include <linux/module.h>
e0ee6298 YY	11	#include <linux/interrupt.h>
	12	#include <linux/input.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/io.h>
5a0e3ad6	15	#include <linux/slab.h>
e0ee6298	16
293b2da1	17	#include <linux/platform_data/keyboard-pxa930_rotary.h>
e0ee6298 YY	18
	19	#define SBCR (0x04)
	20	#define ERCR (0x0c)
	21
	22	#define SBCR_ERSB (1 << 5)
	23
	24	struct pxa930_rotary {
	25	struct input_dev *input_dev;
	26	void __iomem *mmio_base;
	27	int last_ercr;
	28
	29	struct pxa930_rotary_platform_data *pdata;
	30	};
	31
	32	static void clear_sbcr(struct pxa930_rotary *r)
	33	{
	34	uint32_t sbcr = __raw_readl(r->mmio_base + SBCR);
	35
	36	__raw_writel(sbcr \| SBCR_ERSB, r->mmio_base + SBCR);
	37	__raw_writel(sbcr & ~SBCR_ERSB, r->mmio_base + SBCR);
	38	}
	39
	40	static irqreturn_t rotary_irq(int irq, void *dev_id)
	41	{
	42	struct pxa930_rotary *r = dev_id;
	43	struct pxa930_rotary_platform_data *pdata = r->pdata;
	44	int ercr, delta, key;
	45
	46	ercr = __raw_readl(r->mmio_base + ERCR) & 0xf;
	47	clear_sbcr(r);
	48
	49	delta = ercr - r->last_ercr;
	50	if (delta == 0)
	51	return IRQ_HANDLED;
	52
	53	r->last_ercr = ercr;
	54
	55	if (pdata->up_key && pdata->down_key) {
	56	key = (delta > 0) ? pdata->up_key : pdata->down_key;
	57	input_report_key(r->input_dev, key, 1);
	58	input_sync(r->input_dev);
	59	input_report_key(r->input_dev, key, 0);
	60	} else
	61	input_report_rel(r->input_dev, pdata->rel_code, delta);
	62
	63	input_sync(r->input_dev);
	64
	65	return IRQ_HANDLED;
	66	}
	67
	68	static int pxa930_rotary_open(struct input_dev *dev)
	69	{
	70	struct pxa930_rotary *r = input_get_drvdata(dev);
	71
	72	clear_sbcr(r);
	73
	74	return 0;
	75	}
	76
	77	static void pxa930_rotary_close(struct input_dev *dev)
	78	{
	79	struct pxa930_rotary *r = input_get_drvdata(dev);
	80
	81	clear_sbcr(r);
82	}
83
5298cc4c	84	static int pxa930_rotary_probe(struct platform_device *pdev)
e0ee6298	85	{
c838cb3d JH	86	struct pxa930_rotary_platform_data *pdata =
c838cb3d JH	87	dev_get_platdata(&pdev->dev);
e0ee6298 YY	88	struct pxa930_rotary *r;
	89	struct input_dev *input_dev;
	90	struct resource *res;
	91	int irq;
	92	int err;
	93
	94	irq = platform_get_irq(pdev, 0);
	95	if (irq < 0) {
	96	dev_err(&pdev->dev, "no irq for rotary controller\n");
	97	return -ENXIO;
	98	}
	99
	100	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	101	if (!res) {
	102	dev_err(&pdev->dev, "no I/O memory defined\n");
	103	return -ENXIO;
	104	}
	105
	106	if (!pdata) {
	107	dev_err(&pdev->dev, "no platform data defined\n");
	108	return -EINVAL;
	109	}
	110
	111	r = kzalloc(sizeof(struct pxa930_rotary), GFP_KERNEL);
	112	if (!r)
	113	return -ENOMEM;
	114
	115	r->mmio_base = ioremap_nocache(res->start, resource_size(res));
	116	if (r->mmio_base == NULL) {
	117	dev_err(&pdev->dev, "failed to remap IO memory\n");
	118	err = -ENXIO;
	119	goto failed_free;
	120	}
	121
	122	r->pdata = pdata;
	123	platform_set_drvdata(pdev, r);
	124
	125	/* allocate and register the input device */
	126	input_dev = input_allocate_device();
	127	if (!input_dev) {
	128	dev_err(&pdev->dev, "failed to allocate input device\n");
	129	err = -ENOMEM;
	130	goto failed_free_io;
	131	}
	132
	133	input_dev->name = pdev->name;
	134	input_dev->id.bustype = BUS_HOST;
	135	input_dev->open = pxa930_rotary_open;
	136	input_dev->close = pxa930_rotary_close;
	137	input_dev->dev.parent = &pdev->dev;
	138
	139	if (pdata->up_key && pdata->down_key) {
	140	__set_bit(pdata->up_key, input_dev->keybit);
	141	__set_bit(pdata->down_key, input_dev->keybit);
	142	__set_bit(EV_KEY, input_dev->evbit);
	143	} else {
	144	__set_bit(pdata->rel_code, input_dev->relbit);
	145	__set_bit(EV_REL, input_dev->evbit);
	146	}
	147
	148	r->input_dev = input_dev;
	149	input_set_drvdata(input_dev, r);
	150
ec4665c4	151	err = request_irq(irq, rotary_irq, 0,
e0ee6298 YY	152	"enhanced rotary", r);
	153	if (err) {
	154	dev_err(&pdev->dev, "failed to request IRQ\n");
	155	goto failed_free_input;
	156	}
	157
	158	err = input_register_device(input_dev);
	159	if (err) {
	160	dev_err(&pdev->dev, "failed to register input device\n");
	161	goto failed_free_irq;
	162	}
	163
	164	return 0;
	165
	166	failed_free_irq:
	167	free_irq(irq, r);
	168	failed_free_input:
	169	input_free_device(input_dev);
	170	failed_free_io:
	171	iounmap(r->mmio_base);
	172	failed_free:
	173	kfree(r);
	174	return err;
	175	}
	176
e2619cf7	177	static int pxa930_rotary_remove(struct platform_device *pdev)
e0ee6298 YY	178	{
	179	struct pxa930_rotary *r = platform_get_drvdata(pdev);
	180
	181	free_irq(platform_get_irq(pdev, 0), r);
	182	input_unregister_device(r->input_dev);
	183	iounmap(r->mmio_base);
e0ee6298 YY	184	kfree(r);
	185
	186	return 0;
	187	}
	188
	189	static struct platform_driver pxa930_rotary_driver = {
	190	.driver = {
	191	.name = "pxa930-rotary",
e0ee6298 YY	192	},
e0ee6298 YY	193	.probe = pxa930_rotary_probe,
1cb0aa88	194	.remove = pxa930_rotary_remove,
e0ee6298	195	};
5146c84f	196	module_platform_driver(pxa930_rotary_driver);
e0ee6298 YY	197
	198	MODULE_LICENSE("GPL");
	199	MODULE_DESCRIPTION("Driver for PXA93x Enhanced Rotary Controller");
	200	MODULE_AUTHOR("Yao Yong <yaoyong@marvell.com>");