[net-next-2.6.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/init.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/slab.h>

#include <mach/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 __devinit pxa930_rotary_probe(struct platform_device *pdev)
{
	struct pxa930_rotary_platform_data *pdata = pdev->dev.platform_data;
	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, IRQF_DISABLED,
			"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 __devexit 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);
	platform_set_drvdata(pdev, NULL);
	kfree(r);

	return 0;
}

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

static int __init pxa930_rotary_init(void)
{
	return platform_driver_register(&pxa930_rotary_driver);
}
module_init(pxa930_rotary_init);

static void __exit pxa930_rotary_exit(void)
{
	platform_driver_unregister(&pxa930_rotary_driver);
}
module_exit(pxa930_rotary_exit);

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>
	11	#include <linux/init.h>
	12	#include <linux/interrupt.h>
	13	#include <linux/input.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/io.h>
5a0e3ad6	16	#include <linux/slab.h>
e0ee6298 YY	17
	18	#include <mach/pxa930_rotary.h>
	19
	20	#define SBCR (0x04)
	21	#define ERCR (0x0c)
	22
	23	#define SBCR_ERSB (1 << 5)
	24
	25	struct pxa930_rotary {
	26	struct input_dev *input_dev;
	27	void __iomem *mmio_base;
	28	int last_ercr;
	29
	30	struct pxa930_rotary_platform_data *pdata;
	31	};
	32
	33	static void clear_sbcr(struct pxa930_rotary *r)
	34	{
	35	uint32_t sbcr = __raw_readl(r->mmio_base + SBCR);
	36
	37	__raw_writel(sbcr \| SBCR_ERSB, r->mmio_base + SBCR);
	38	__raw_writel(sbcr & ~SBCR_ERSB, r->mmio_base + SBCR);
	39	}
	40
	41	static irqreturn_t rotary_irq(int irq, void *dev_id)
	42	{
	43	struct pxa930_rotary *r = dev_id;
	44	struct pxa930_rotary_platform_data *pdata = r->pdata;
	45	int ercr, delta, key;
	46
	47	ercr = __raw_readl(r->mmio_base + ERCR) & 0xf;
	48	clear_sbcr(r);
	49
	50	delta = ercr - r->last_ercr;
	51	if (delta == 0)
	52	return IRQ_HANDLED;
	53
	54	r->last_ercr = ercr;
	55
	56	if (pdata->up_key && pdata->down_key) {
	57	key = (delta > 0) ? pdata->up_key : pdata->down_key;
	58	input_report_key(r->input_dev, key, 1);
	59	input_sync(r->input_dev);
	60	input_report_key(r->input_dev, key, 0);
	61	} else
	62	input_report_rel(r->input_dev, pdata->rel_code, delta);
	63
	64	input_sync(r->input_dev);
	65
	66	return IRQ_HANDLED;
	67	}
	68
	69	static int pxa930_rotary_open(struct input_dev *dev)
	70	{
	71	struct pxa930_rotary *r = input_get_drvdata(dev);
	72
	73	clear_sbcr(r);
	74
	75	return 0;
	76	}
	77
	78	static void pxa930_rotary_close(struct input_dev *dev)
	79	{
	80	struct pxa930_rotary *r = input_get_drvdata(dev);
81
82	clear_sbcr(r);
83	}
84
85	static int __devinit pxa930_rotary_probe(struct platform_device *pdev)
86	{
87	struct pxa930_rotary_platform_data *pdata = pdev->dev.platform_data;
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
151	err = request_irq(irq, rotary_irq, IRQF_DISABLED,
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
177	static int __devexit pxa930_rotary_remove(struct platform_device *pdev)
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);
184	platform_set_drvdata(pdev, NULL);
185	kfree(r);
186
187	return 0;
188	}
189
190	static struct platform_driver pxa930_rotary_driver = {
191	.driver = {
192	.name = "pxa930-rotary",
193	.owner = THIS_MODULE,
194	},
195	.probe = pxa930_rotary_probe,
196	.remove = __devexit_p(pxa930_rotary_remove),
197	};
198
199	static int __init pxa930_rotary_init(void)
200	{
201	return platform_driver_register(&pxa930_rotary_driver);
202	}
203	module_init(pxa930_rotary_init);
204
205	static void __exit pxa930_rotary_exit(void)
206	{
207	platform_driver_unregister(&pxa930_rotary_driver);
208	}
209	module_exit(pxa930_rotary_exit);
210
211	MODULE_LICENSE("GPL");
212	MODULE_DESCRIPTION("Driver for PXA93x Enhanced Rotary Controller");
213	MODULE_AUTHOR("Yao Yong <yaoyong@marvell.com>");