1 files changed, 117 insertions, 0 deletions

diff --git a/drivers/hid/hid-primax.c b/drivers/hid/hid-primax.c
new file mode 100644
index 000000000000..4d3c60d88318
--- /dev/null
+++ b/drivers/hid/hid-primax.c
@@ -0,0 +1,117 @@
+/*
+ * HID driver for primax and similar keyboards with in-band modifiers
+ *
+ * Copyright 2011 Google Inc. All Rights Reserved
+ *
+ * Author:
+ *      Terry Lambert <tlambert@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#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 int px_probe(struct hid_device *hid, const struct hid_device_id *id)
+{
+        int ret;
+
+        ret = hid_parse(hid);
+        if (ret) {
+                hid_err(hid, "parse failed\n");
+                goto fail;
+        }
+
+        ret = hid_hw_start(hid, HID_CONNECT_DEFAULT);
+        if (ret)
+                hid_err(hid, "hw start failed\n");
+
+fail:
+        return ret;
+}
+
+static void px_remove(struct hid_device *hid)
+{
+        hid_hw_stop(hid);
+}
+
+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,
+        .probe = px_probe,
+        .remove = px_remove,
+};
+
+static int __init px_init(void)
+{
+        return hid_register_driver(&px_driver);
+}
+
+static void __exit px_exit(void)
+{
+        hid_unregister_driver(&px_driver);
+}
+
+module_init(px_init);
+module_exit(px_exit);
+MODULE_AUTHOR("Terry Lambert <tlambert@google.com>");
+MODULE_LICENSE("GPL");