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9c92ab61 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
f6a04605 TL |
2 | /* |
3 | * HID driver for primax and similar keyboards with in-band modifiers | |
4 | * | |
5 | * Copyright 2011 Google Inc. All Rights Reserved | |
6 | * | |
7 | * Author: | |
8 | * Terry Lambert <tlambert@google.com> | |
f6a04605 TL |
9 | */ |
10 | ||
11 | #include <linux/device.h> | |
12 | #include <linux/hid.h> | |
13 | #include <linux/module.h> | |
14 | ||
15 | #include "hid-ids.h" | |
16 | ||
17 | static int px_raw_event(struct hid_device *hid, struct hid_report *report, | |
18 | u8 *data, int size) | |
19 | { | |
20 | int idx = size; | |
21 | ||
22 | switch (report->id) { | |
23 | case 0: /* keyboard input */ | |
24 | /* | |
25 | * Convert in-band modifier key values into out of band | |
26 | * modifier bits and pull the key strokes from the report. | |
27 | * Thus a report data set which looked like: | |
28 | * | |
29 | * [00][00][E0][30][00][00][00][00] | |
30 | * (no modifier bits + "Left Shift" key + "1" key) | |
31 | * | |
32 | * Would be converted to: | |
33 | * | |
34 | * [01][00][00][30][00][00][00][00] | |
35 | * (Left Shift modifier bit + "1" key) | |
36 | * | |
37 | * As long as it's in the size range, the upper level | |
38 | * drivers don't particularly care if there are in-band | |
39 | * 0-valued keys, so they don't stop parsing. | |
40 | */ | |
41 | while (--idx > 1) { | |
42 | if (data[idx] < 0xE0 || data[idx] > 0xE7) | |
43 | continue; | |
44 | data[0] |= (1 << (data[idx] - 0xE0)); | |
45 | data[idx] = 0; | |
46 | } | |
47 | hid_report_raw_event(hid, HID_INPUT_REPORT, data, size, 0); | |
48 | return 1; | |
49 | ||
50 | default: /* unknown report */ | |
51 | /* Unknown report type; pass upstream */ | |
52 | hid_info(hid, "unknown report type %d\n", report->id); | |
53 | break; | |
54 | } | |
55 | ||
56 | return 0; | |
57 | } | |
58 | ||
f6a04605 TL |
59 | static const struct hid_device_id px_devices[] = { |
60 | { HID_USB_DEVICE(USB_VENDOR_ID_PRIMAX, USB_DEVICE_ID_PRIMAX_KEYBOARD) }, | |
61 | { } | |
62 | }; | |
63 | MODULE_DEVICE_TABLE(hid, px_devices); | |
64 | ||
65 | static struct hid_driver px_driver = { | |
66 | .name = "primax", | |
67 | .id_table = px_devices, | |
68 | .raw_event = px_raw_event, | |
f6a04605 | 69 | }; |
f425458e | 70 | module_hid_driver(px_driver); |
f6a04605 | 71 | |
f6a04605 TL |
72 | MODULE_AUTHOR("Terry Lambert <tlambert@google.com>"); |
73 | MODULE_LICENSE("GPL"); |