| Terry Lambert | f6a0460 | 2011-10-14 17:18:54 -0700 | [diff] [blame] | 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 int px_probe(struct hid_device *hid, const struct hid_device_id *id) |
| 68 | { |
| 69 | int ret; |
| 70 | |
| 71 | ret = hid_parse(hid); |
| 72 | if (ret) { |
| 73 | hid_err(hid, "parse failed\n"); |
| 74 | goto fail; |
| 75 | } |
| 76 | |
| 77 | ret = hid_hw_start(hid, HID_CONNECT_DEFAULT); |
| 78 | if (ret) |
| 79 | hid_err(hid, "hw start failed\n"); |
| 80 | |
| 81 | fail: |
| 82 | return ret; |
| 83 | } |
| 84 | |
| 85 | static void px_remove(struct hid_device *hid) |
| 86 | { |
| 87 | hid_hw_stop(hid); |
| 88 | } |
| 89 | |
| 90 | static const struct hid_device_id px_devices[] = { |
| 91 | { HID_USB_DEVICE(USB_VENDOR_ID_PRIMAX, USB_DEVICE_ID_PRIMAX_KEYBOARD) }, |
| 92 | { } |
| 93 | }; |
| 94 | MODULE_DEVICE_TABLE(hid, px_devices); |
| 95 | |
| 96 | static struct hid_driver px_driver = { |
| 97 | .name = "primax", |
| 98 | .id_table = px_devices, |
| 99 | .raw_event = px_raw_event, |
| 100 | .probe = px_probe, |
| 101 | .remove = px_remove, |
| 102 | }; |
| 103 | |
| 104 | static int __init px_init(void) |
| 105 | { |
| 106 | return hid_register_driver(&px_driver); |
| 107 | } |
| 108 | |
| 109 | static void __exit px_exit(void) |
| 110 | { |
| 111 | hid_unregister_driver(&px_driver); |
| 112 | } |
| 113 | |
| 114 | module_init(px_init); |
| 115 | module_exit(px_exit); |
| 116 | MODULE_AUTHOR("Terry Lambert <tlambert@google.com>"); |
| 117 | MODULE_LICENSE("GPL"); |