These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / drivers / hid / hid-gembird.c

diff --git a/kernel/drivers/hid/hid-gembird.c b/kernel/drivers/hid/hid-gembird.c
new file mode 100644 (file)
index 0000000..e55e519
--- /dev/null
+++ b/kernel/drivers/hid/hid-gembird.c
@@ -0,0 +1,116 @@
+/*
+ *  HID driver for Gembird Joypad, "PC Game Controller"
+ *
+ *  Copyright (c) 2015 Red Hat, Inc
+ *  Copyright (c) 2015 Benjamin Tissoires
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include <linux/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+#define GEMBIRD_START_FAULTY_RDESC     8
+
+static const __u8 gembird_jpd_faulty_rdesc[] = {
+       0x75, 0x08,                     /*   Report Size (8)            */
+       0x95, 0x05,                     /*   Report Count (5)           */
+       0x15, 0x00,                     /*   Logical Minimum (0)        */
+       0x26, 0xff, 0x00,               /*   Logical Maximum (255)      */
+       0x35, 0x00,                     /*   Physical Minimum (0)       */
+       0x46, 0xff, 0x00,               /*   Physical Maximum (255)     */
+       0x09, 0x30,                     /*   Usage (X)                  */
+       0x09, 0x31,                     /*   Usage (Y)                  */
+       0x09, 0x32,                     /*   Usage (Z)                  */
+       0x09, 0x32,                     /*   Usage (Z)                  */
+       0x09, 0x35,                     /*   Usage (Rz)                 */
+       0x81, 0x02,                     /*   Input (Data,Var,Abs)       */
+};
+
+/*
+ * we fix the report descriptor by:
+ * - marking the first Z axis as constant (so it is ignored by HID)
+ * - assign the original second Z to Rx
+ * - assign the original Rz to Ry
+ */
+static const __u8 gembird_jpd_fixed_rdesc[] = {
+       0x75, 0x08,                     /*   Report Size (8)            */
+       0x95, 0x02,                     /*   Report Count (2)           */
+       0x15, 0x00,                     /*   Logical Minimum (0)        */
+       0x26, 0xff, 0x00,               /*   Logical Maximum (255)      */
+       0x35, 0x00,                     /*   Physical Minimum (0)       */
+       0x46, 0xff, 0x00,               /*   Physical Maximum (255)     */
+       0x09, 0x30,                     /*   Usage (X)                  */
+       0x09, 0x31,                     /*   Usage (Y)                  */
+       0x81, 0x02,                     /*   Input (Data,Var,Abs)       */
+       0x95, 0x01,                     /*   Report Count (1)           */
+       0x09, 0x32,                     /*   Usage (Z)                  */
+       0x81, 0x01,                     /*   Input (Cnst,Arr,Abs)       */
+       0x95, 0x02,                     /*   Report Count (2)           */
+       0x09, 0x33,                     /*   Usage (Rx)                 */
+       0x09, 0x34,                     /*   Usage (Ry)                 */
+       0x81, 0x02,                     /*   Input (Data,Var,Abs)       */
+};
+
+static __u8 *gembird_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+               unsigned int *rsize)
+{
+       __u8 *new_rdesc;
+       /* delta_size is > 0 */
+       size_t delta_size = sizeof(gembird_jpd_fixed_rdesc) -
+                           sizeof(gembird_jpd_faulty_rdesc);
+       size_t new_size = *rsize + delta_size;
+
+       if (*rsize >= 31 && !memcmp(&rdesc[GEMBIRD_START_FAULTY_RDESC],
+                                   gembird_jpd_faulty_rdesc,
+                                   sizeof(gembird_jpd_faulty_rdesc))) {
+               new_rdesc = devm_kzalloc(&hdev->dev, new_size, GFP_KERNEL);
+               if (new_rdesc == NULL)
+                       return rdesc;
+
+               dev_info(&hdev->dev,
+                        "fixing Gembird JPD-DualForce 2 report descriptor.\n");
+
+               /* start by copying the end of the rdesc */
+               memcpy(new_rdesc + delta_size, rdesc, *rsize);
+
+               /* add the correct beginning */
+               memcpy(new_rdesc, rdesc, GEMBIRD_START_FAULTY_RDESC);
+
+               /* replace the faulty part with the fixed one */
+               memcpy(new_rdesc + GEMBIRD_START_FAULTY_RDESC,
+                      gembird_jpd_fixed_rdesc,
+                      sizeof(gembird_jpd_fixed_rdesc));
+
+               *rsize = new_size;
+               rdesc = new_rdesc;
+       }
+
+       return rdesc;
+}
+
+static const struct hid_device_id gembird_devices[] = {
+       { HID_USB_DEVICE(USB_VENDOR_ID_GEMBIRD,
+                        USB_DEVICE_ID_GEMBIRD_JPD_DUALFORCE2) },
+       { }
+};
+MODULE_DEVICE_TABLE(hid, gembird_devices);
+
+static struct hid_driver gembird_driver = {
+       .name = "gembird",
+       .id_table = gembird_devices,
+       .report_fixup = gembird_report_fixup,
+};
+module_hid_driver(gembird_driver);
+
+MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
+MODULE_DESCRIPTION("HID Gembird joypad driver");
+MODULE_LICENSE("GPL");