[linux-block.git] / drivers / input / misc / sgi_btns.c

/*
 *  SGI Volume Button interface driver
 *
 *  Copyright (C) 2008  Thomas Bogendoerfer <tsbogend@alpha.franken.de>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
#include <linux/init.h>
#include <linux/input-polldev.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#ifdef CONFIG_SGI_IP22
#include <asm/sgi/ioc.h>

static inline u8 button_status(void)
{
	u8 status;

	status = readb(&sgioc->panel) ^ 0xa0;
	return ((status & 0x80) >> 6) | ((status & 0x20) >> 5);
}
#endif

#ifdef CONFIG_SGI_IP32
#include <asm/ip32/mace.h>

static inline u8 button_status(void)
{
	u64 status;

	status = readq(&mace->perif.audio.control);
	writeq(status & ~(3U << 23), &mace->perif.audio.control);

	return (status >> 23) & 3;
}
#endif

#define BUTTONS_POLL_INTERVAL	30	/* msec */
#define BUTTONS_COUNT_THRESHOLD	3

static const unsigned short sgi_map[] = {
	KEY_VOLUMEDOWN,
	KEY_VOLUMEUP
};

struct buttons_dev {
	struct input_polled_dev *poll_dev;
	unsigned short keymap[ARRAY_SIZE(sgi_map)];
	int count[ARRAY_SIZE(sgi_map)];
};

static void handle_buttons(struct input_polled_dev *dev)
{
	struct buttons_dev *bdev = dev->private;
	struct input_dev *input = dev->input;
	u8 status;
	int i;

	status = button_status();

	for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
		if (status & (1U << i)) {
			if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
				input_event(input, EV_MSC, MSC_SCAN, i);
				input_report_key(input, bdev->keymap[i], 1);
				input_sync(input);
			}
		} else {
			if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
				input_event(input, EV_MSC, MSC_SCAN, i);
				input_report_key(input, bdev->keymap[i], 0);
				input_sync(input);
			}
			bdev->count[i] = 0;
		}
	}
}

static int __devinit sgi_buttons_probe(struct platform_device *pdev)
{
	struct buttons_dev *bdev;
	struct input_polled_dev *poll_dev;
	struct input_dev *input;
	int error, i;

	bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
	poll_dev = input_allocate_polled_device();
	if (!bdev || !poll_dev) {
		error = -ENOMEM;
		goto err_free_mem;
	}

	memcpy(bdev->keymap, sgi_map, sizeof(bdev->keymap));

	poll_dev->private = bdev;
	poll_dev->poll = handle_buttons;
	poll_dev->poll_interval = BUTTONS_POLL_INTERVAL;

	input = poll_dev->input;
	input->name = "SGI buttons";
	input->phys = "sgi/input0";
	input->id.bustype = BUS_HOST;
	input->dev.parent = &pdev->dev;

	input->keycode = bdev->keymap;
	input->keycodemax = ARRAY_SIZE(bdev->keymap);
	input->keycodesize = sizeof(unsigned short);

	input_set_capability(input, EV_MSC, MSC_SCAN);
	__set_bit(EV_KEY, input->evbit);
	for (i = 0; i < ARRAY_SIZE(sgi_map); i++)
		__set_bit(bdev->keymap[i], input->keybit);
	__clear_bit(KEY_RESERVED, input->keybit);

	bdev->poll_dev = poll_dev;
	dev_set_drvdata(&pdev->dev, bdev);

	error = input_register_polled_device(poll_dev);
	if (error)
		goto err_free_mem;

	return 0;

 err_free_mem:
	input_free_polled_device(poll_dev);
	kfree(bdev);
	dev_set_drvdata(&pdev->dev, NULL);
	return error;
}

static int __devexit sgi_buttons_remove(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct buttons_dev *bdev = dev_get_drvdata(dev);

	input_unregister_polled_device(bdev->poll_dev);
	input_free_polled_device(bdev->poll_dev);
	kfree(bdev);
	dev_set_drvdata(dev, NULL);

	return 0;
}

static struct platform_driver sgi_buttons_driver = {
	.probe	= sgi_buttons_probe,
	.remove	= __devexit_p(sgi_buttons_remove),
	.driver	= {
		.name	= "sgibtns",
		.owner	= THIS_MODULE,
	},
};

static int __init sgi_buttons_init(void)
{
	return platform_driver_register(&sgi_buttons_driver);
}

static void __exit sgi_buttons_exit(void)
{
	platform_driver_unregister(&sgi_buttons_driver);
}

MODULE_LICENSE("GPL");
module_init(sgi_buttons_init);
module_exit(sgi_buttons_exit);
Commit	Line	Data
3bee2a04	1	/*
48ad88b1	2	* SGI Volume Button interface driver
3bee2a04 TB	3	*
	4	* Copyright (C) 2008 Thomas Bogendoerfer <tsbogend@alpha.franken.de>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20	#include <linux/init.h>
	21	#include <linux/input-polldev.h>
	22	#include <linux/ioport.h>
	23	#include <linux/module.h>
	24	#include <linux/platform_device.h>
5a0e3ad6	25	#include <linux/slab.h>
3bee2a04	26
48ad88b1 TB	27	#ifdef CONFIG_SGI_IP22
	28	#include <asm/sgi/ioc.h>
	29
	30	static inline u8 button_status(void)
	31	{
	32	u8 status;
	33
	34	status = readb(&sgioc->panel) ^ 0xa0;
	35	return ((status & 0x80) >> 6) \| ((status & 0x20) >> 5);
	36	}
	37	#endif
	38
	39	#ifdef CONFIG_SGI_IP32
3bee2a04 TB	40	#include <asm/ip32/mace.h>
3bee2a04 TB	41
48ad88b1 TB	42	static inline u8 button_status(void)
	43	{
	44	u64 status;
	45
	46	status = readq(&mace->perif.audio.control);
	47	writeq(status & ~(3U << 23), &mace->perif.audio.control);
	48
	49	return (status >> 23) & 3;
	50	}
	51	#endif
	52
3bee2a04 TB	53	#define BUTTONS_POLL_INTERVAL 30 /* msec */
	54	#define BUTTONS_COUNT_THRESHOLD 3
	55
48ad88b1 TB	56	static const unsigned short sgi_map[] = {
	57	KEY_VOLUMEDOWN,
	58	KEY_VOLUMEUP
3bee2a04 TB	59	};
	60
	61	struct buttons_dev {
	62	struct input_polled_dev *poll_dev;
48ad88b1 TB	63	unsigned short keymap[ARRAY_SIZE(sgi_map)];
48ad88b1 TB	64	int count[ARRAY_SIZE(sgi_map)];
3bee2a04 TB	65	};
	66
	67	static void handle_buttons(struct input_polled_dev *dev)
	68	{
	69	struct buttons_dev *bdev = dev->private;
	70	struct input_dev *input = dev->input;
48ad88b1	71	u8 status;
3bee2a04 TB	72	int i;
3bee2a04 TB	73
48ad88b1	74	status = button_status();
3bee2a04 TB	75
	76	for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
	77	if (status & (1U << i)) {
3bee2a04 TB	78	if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
	79	input_event(input, EV_MSC, MSC_SCAN, i);
	80	input_report_key(input, bdev->keymap[i], 1);
	81	input_sync(input);
	82	}
	83	} else {
	84	if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
	85	input_event(input, EV_MSC, MSC_SCAN, i);
	86	input_report_key(input, bdev->keymap[i], 0);
	87	input_sync(input);
	88	}
	89	bdev->count[i] = 0;
	90	}
	91	}
	92	}
	93
48ad88b1	94	static int __devinit sgi_buttons_probe(struct platform_device *pdev)
3bee2a04 TB	95	{
	96	struct buttons_dev *bdev;
	97	struct input_polled_dev *poll_dev;
	98	struct input_dev *input;
	99	int error, i;
	100
	101	bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
	102	poll_dev = input_allocate_polled_device();
	103	if (!bdev \|\| !poll_dev) {
	104	error = -ENOMEM;
	105	goto err_free_mem;
	106	}
	107
48ad88b1	108	memcpy(bdev->keymap, sgi_map, sizeof(bdev->keymap));
3bee2a04 TB	109
	110	poll_dev->private = bdev;
	111	poll_dev->poll = handle_buttons;
	112	poll_dev->poll_interval = BUTTONS_POLL_INTERVAL;
	113
	114	input = poll_dev->input;
48ad88b1 TB	115	input->name = "SGI buttons";
48ad88b1 TB	116	input->phys = "sgi/input0";
3bee2a04 TB	117	input->id.bustype = BUS_HOST;
	118	input->dev.parent = &pdev->dev;
	119
	120	input->keycode = bdev->keymap;
	121	input->keycodemax = ARRAY_SIZE(bdev->keymap);
	122	input->keycodesize = sizeof(unsigned short);
	123
	124	input_set_capability(input, EV_MSC, MSC_SCAN);
	125	__set_bit(EV_KEY, input->evbit);
48ad88b1	126	for (i = 0; i < ARRAY_SIZE(sgi_map); i++)
3bee2a04 TB	127	__set_bit(bdev->keymap[i], input->keybit);
	128	__clear_bit(KEY_RESERVED, input->keybit);
	129
	130	bdev->poll_dev = poll_dev;
	131	dev_set_drvdata(&pdev->dev, bdev);
	132
	133	error = input_register_polled_device(poll_dev);
	134	if (error)
	135	goto err_free_mem;
	136
	137	return 0;
	138
	139	err_free_mem:
	140	input_free_polled_device(poll_dev);
	141	kfree(bdev);
	142	dev_set_drvdata(&pdev->dev, NULL);
	143	return error;
	144	}
	145
48ad88b1	146	static int __devexit sgi_buttons_remove(struct platform_device *pdev)
3bee2a04 TB	147	{
	148	struct device *dev = &pdev->dev;
	149	struct buttons_dev *bdev = dev_get_drvdata(dev);
	150
	151	input_unregister_polled_device(bdev->poll_dev);
	152	input_free_polled_device(bdev->poll_dev);
	153	kfree(bdev);
	154	dev_set_drvdata(dev, NULL);
	155
	156	return 0;
	157	}
	158
48ad88b1 TB	159	static struct platform_driver sgi_buttons_driver = {
	160	.probe = sgi_buttons_probe,
	161	.remove = __devexit_p(sgi_buttons_remove),
3bee2a04	162	.driver = {
48ad88b1	163	.name = "sgibtns",
3bee2a04 TB	164	.owner = THIS_MODULE,
	165	},
	166	};
	167
48ad88b1	168	static int __init sgi_buttons_init(void)
3bee2a04	169	{
48ad88b1	170	return platform_driver_register(&sgi_buttons_driver);
3bee2a04 TB	171	}
3bee2a04 TB	172
48ad88b1	173	static void __exit sgi_buttons_exit(void)
3bee2a04	174	{
48ad88b1	175	platform_driver_unregister(&sgi_buttons_driver);
3bee2a04 TB	176	}
3bee2a04 TB	177
4c2bdcdc	178	MODULE_LICENSE("GPL");
48ad88b1 TB	179	module_init(sgi_buttons_init);
48ad88b1 TB	180	module_exit(sgi_buttons_exit);