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Linux/drivers/hid/hid-primax.c

  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 <tlambert@google.com>
  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 
 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,
 77 };
 78 module_hid_driver(px_driver);
 79 
 80 MODULE_AUTHOR("Terry Lambert <tlambert@google.com>");
 81 MODULE_LICENSE("GPL");
 82 

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