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73 lines
1.8 KiB
73 lines
1.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* HID driver for primax and similar keyboards with in-band modifiers |
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* |
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* Copyright 2011 Google Inc. All Rights Reserved |
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* |
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* Author: |
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* Terry Lambert <[email protected]> |
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*/ |
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#include <linux/device.h> |
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#include <linux/hid.h> |
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#include <linux/module.h> |
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#include "hid-ids.h" |
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static int px_raw_event(struct hid_device *hid, struct hid_report *report, |
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u8 *data, int size) |
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{ |
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int idx = size; |
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switch (report->id) { |
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case 0: /* keyboard input */ |
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/* |
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* Convert in-band modifier key values into out of band |
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* modifier bits and pull the key strokes from the report. |
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* Thus a report data set which looked like: |
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* |
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* [00][00][E0][30][00][00][00][00] |
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* (no modifier bits + "Left Shift" key + "1" key) |
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* |
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* Would be converted to: |
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* |
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* [01][00][00][30][00][00][00][00] |
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* (Left Shift modifier bit + "1" key) |
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* |
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* As long as it's in the size range, the upper level |
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* drivers don't particularly care if there are in-band |
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* 0-valued keys, so they don't stop parsing. |
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*/ |
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while (--idx > 1) { |
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if (data[idx] < 0xE0 || data[idx] > 0xE7) |
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continue; |
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data[0] |= (1 << (data[idx] - 0xE0)); |
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data[idx] = 0; |
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} |
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hid_report_raw_event(hid, HID_INPUT_REPORT, data, size, 0); |
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return 1; |
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default: /* unknown report */ |
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/* Unknown report type; pass upstream */ |
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hid_info(hid, "unknown report type %d\n", report->id); |
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break; |
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} |
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return 0; |
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} |
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static const struct hid_device_id px_devices[] = { |
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{ HID_USB_DEVICE(USB_VENDOR_ID_PRIMAX, USB_DEVICE_ID_PRIMAX_KEYBOARD) }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(hid, px_devices); |
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static struct hid_driver px_driver = { |
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.name = "primax", |
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.id_table = px_devices, |
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.raw_event = px_raw_event, |
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}; |
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module_hid_driver(px_driver); |
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MODULE_AUTHOR("Terry Lambert <[email protected]>"); |
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MODULE_LICENSE("GPL");
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