// SPDX-License-Identifier: GPL-2.0-only /* * HID driver for primax and similar keyboards with in-band modifiers * * Copyright 2011 Google Inc. All Rights Reserved * * Author: * Terry Lambert <tlambert@google.com> */ #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 <tlambert@google.com>"); MODULE_LICENSE("GPL");