/*
* HID driver for primax and similar keyboards with in-band modifiers
*
* Copyright 2011 Google Inc. All Rights Reserved
*
* Author:
* Terry Lambert <tlambert@google.com>
*
* 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 int px_probe(struct hid_device *hid, const struct hid_device_id *id)
{
int ret;
ret = hid_parse(hid);
if (ret) {
hid_err(hid, "parse failed\n");
goto fail;
}
ret = hid_hw_start(hid, HID_CONNECT_DEFAULT);
if (ret)
hid_err(hid, "hw start failed\n");
fail:
return ret;
}
static void px_remove(struct hid_device *hid)
{
hid_hw_stop(hid);
}
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,
.probe = px_probe,
.remove = px_remove,
};
static int __init px_init(void)
{
return hid_register_driver(&px_driver);
}
static void __exit px_exit(void)
{
hid_unregister_driver(&px_driver);
}
module_init(px_init);
module_exit(px_exit);
MODULE_AUTHOR("Terry Lambert <tlambert@google.com>");
MODULE_LICENSE("GPL");
