[linux.git] / drivers / hid / hid-primax.c

/*
 * HID driver for primax and similar keyboards with in-band modifiers
 *
 * Copyright 2011 Google Inc. All Rights Reserved
 *
 * Author:
 *	Terry Lambert <[email protected]>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 */

#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>

#include "hid-ids.h"

static int px_raw_event(struct hid_device *hid, struct hid_report *report,
	 u8 *data, int size)
{
	int idx = size;

	switch (report->id) {
	case 0:		/* keyboard input */
		/*
		 * Convert in-band modifier key values into out of band
		 * modifier bits and pull the key strokes from the report.
		 * Thus a report data set which looked like:
		 *
		 * [00][00][E0][30][00][00][00][00]
		 * (no modifier bits + "Left Shift" key + "1" key)
		 *
		 * Would be converted to:
		 *
		 * [01][00][00][30][00][00][00][00]
		 * (Left Shift modifier bit + "1" key)
		 *
		 * As long as it's in the size range, the upper level
		 * drivers don't particularly care if there are in-band
		 * 0-valued keys, so they don't stop parsing.
		 */
		while (--idx > 1) {
			if (data[idx] < 0xE0 || data[idx] > 0xE7)
				continue;
			data[0] |= (1 << (data[idx] - 0xE0));
			data[idx] = 0;
		}
		hid_report_raw_event(hid, HID_INPUT_REPORT, data, size, 0);
		return 1;

	default:	/* unknown report */
		/* Unknown report type; pass upstream */
		hid_info(hid, "unknown report type %d\n", report->id);
		break;
	}

	return 0;
}

static const struct hid_device_id px_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_PRIMAX, USB_DEVICE_ID_PRIMAX_KEYBOARD) },
	{ }
};
MODULE_DEVICE_TABLE(hid, px_devices);

static struct hid_driver px_driver = {
	.name = "primax",
	.id_table = px_devices,
	.raw_event = px_raw_event,
};
module_hid_driver(px_driver);

MODULE_AUTHOR("Terry Lambert <[email protected]>");
MODULE_LICENSE("GPL");
Commit	Line	Data
f6a04605 TL	1	/*
	2	* HID driver for primax and similar keyboards with in-band modifiers
	3	*
	4	* Copyright 2011 Google Inc. All Rights Reserved
	5	*
	6	* Author:
	7	* Terry Lambert <[email protected]>
	8	*
	9	* This software is licensed under the terms of the GNU General Public
	10	* License version 2, as published by the Free Software Foundation, and
	11	* may be copied, distributed, and modified under those terms.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*/
	18
	19	#include <linux/device.h>
	20	#include <linux/hid.h>
	21	#include <linux/module.h>
	22
	23	#include "hid-ids.h"
	24
	25	static int px_raw_event(struct hid_device hid, struct hid_report report,
	26	u8 *data, int size)
	27	{
	28	int idx = size;
	29
	30	switch (report->id) {
	31	case 0: /* keyboard input */
	32	/*
	33	* Convert in-band modifier key values into out of band
	34	* modifier bits and pull the key strokes from the report.
	35	* Thus a report data set which looked like:
	36	*
	37	* [00][00][E0][30][00][00][00][00]
	38	* (no modifier bits + "Left Shift" key + "1" key)
	39	*
	40	* Would be converted to:
	41	*
	42	* [01][00][00][30][00][00][00][00]
	43	* (Left Shift modifier bit + "1" key)
	44	*
	45	* As long as it's in the size range, the upper level
	46	* drivers don't particularly care if there are in-band
	47	* 0-valued keys, so they don't stop parsing.
	48	*/
	49	while (--idx > 1) {
	50	if (data[idx] < 0xE0 \|\| data[idx] > 0xE7)
	51	continue;
	52	data[0] \|= (1 << (data[idx] - 0xE0));
	53	data[idx] = 0;
	54	}
	55	hid_report_raw_event(hid, HID_INPUT_REPORT, data, size, 0);
	56	return 1;
	57
	58	default: /* unknown report */
	59	/* Unknown report type; pass upstream */
	60	hid_info(hid, "unknown report type %d\n", report->id);
	61	break;
	62	}
	63
	64	return 0;
65	}
66
f6a04605 TL	67	static const struct hid_device_id px_devices[] = {
	68	{ HID_USB_DEVICE(USB_VENDOR_ID_PRIMAX, USB_DEVICE_ID_PRIMAX_KEYBOARD) },
	69	{ }
	70	};
	71	MODULE_DEVICE_TABLE(hid, px_devices);
	72
	73	static struct hid_driver px_driver = {
	74	.name = "primax",
	75	.id_table = px_devices,
	76	.raw_event = px_raw_event,
f6a04605	77	};
f425458e	78	module_hid_driver(px_driver);
f6a04605	79
f6a04605 TL	80	MODULE_AUTHOR("Terry Lambert <[email protected]>");
f6a04605 TL	81	MODULE_LICENSE("GPL");