| Benjamin Tissoires | 931830a | 2015-08-13 11:11:27 -0400 | [diff] [blame] | 1 | /* |
| 2 | * HID driver for Gembird Joypad, "PC Game Controller" |
| 3 | * |
| 4 | * Copyright (c) 2015 Red Hat, Inc |
| 5 | * Copyright (c) 2015 Benjamin Tissoires |
| 6 | */ |
| 7 | |
| 8 | /* |
| 9 | * This program is free software; you can redistribute it and/or modify it |
| 10 | * under the terms of the GNU General Public License as published by the Free |
| 11 | * Software Foundation; either version 2 of the License, or (at your option) |
| 12 | * any later version. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/device.h> |
| 16 | #include <linux/hid.h> |
| 17 | #include <linux/module.h> |
| 18 | |
| 19 | #include "hid-ids.h" |
| 20 | |
| 21 | #define GEMBIRD_START_FAULTY_RDESC 8 |
| 22 | |
| 23 | static const __u8 gembird_jpd_faulty_rdesc[] = { |
| 24 | 0x75, 0x08, /* Report Size (8) */ |
| 25 | 0x95, 0x05, /* Report Count (5) */ |
| 26 | 0x15, 0x00, /* Logical Minimum (0) */ |
| 27 | 0x26, 0xff, 0x00, /* Logical Maximum (255) */ |
| 28 | 0x35, 0x00, /* Physical Minimum (0) */ |
| 29 | 0x46, 0xff, 0x00, /* Physical Maximum (255) */ |
| 30 | 0x09, 0x30, /* Usage (X) */ |
| 31 | 0x09, 0x31, /* Usage (Y) */ |
| 32 | 0x09, 0x32, /* Usage (Z) */ |
| 33 | 0x09, 0x32, /* Usage (Z) */ |
| 34 | 0x09, 0x35, /* Usage (Rz) */ |
| 35 | 0x81, 0x02, /* Input (Data,Var,Abs) */ |
| 36 | }; |
| 37 | |
| 38 | /* |
| 39 | * we fix the report descriptor by: |
| 40 | * - marking the first Z axis as constant (so it is ignored by HID) |
| 41 | * - assign the original second Z to Rx |
| 42 | * - assign the original Rz to Ry |
| 43 | */ |
| 44 | static const __u8 gembird_jpd_fixed_rdesc[] = { |
| 45 | 0x75, 0x08, /* Report Size (8) */ |
| 46 | 0x95, 0x02, /* Report Count (2) */ |
| 47 | 0x15, 0x00, /* Logical Minimum (0) */ |
| 48 | 0x26, 0xff, 0x00, /* Logical Maximum (255) */ |
| 49 | 0x35, 0x00, /* Physical Minimum (0) */ |
| 50 | 0x46, 0xff, 0x00, /* Physical Maximum (255) */ |
| 51 | 0x09, 0x30, /* Usage (X) */ |
| 52 | 0x09, 0x31, /* Usage (Y) */ |
| 53 | 0x81, 0x02, /* Input (Data,Var,Abs) */ |
| 54 | 0x95, 0x01, /* Report Count (1) */ |
| 55 | 0x09, 0x32, /* Usage (Z) */ |
| 56 | 0x81, 0x01, /* Input (Cnst,Arr,Abs) */ |
| 57 | 0x95, 0x02, /* Report Count (2) */ |
| 58 | 0x09, 0x33, /* Usage (Rx) */ |
| 59 | 0x09, 0x34, /* Usage (Ry) */ |
| 60 | 0x81, 0x02, /* Input (Data,Var,Abs) */ |
| 61 | }; |
| 62 | |
| 63 | static __u8 *gembird_report_fixup(struct hid_device *hdev, __u8 *rdesc, |
| 64 | unsigned int *rsize) |
| 65 | { |
| 66 | __u8 *new_rdesc; |
| 67 | /* delta_size is > 0 */ |
| 68 | size_t delta_size = sizeof(gembird_jpd_fixed_rdesc) - |
| 69 | sizeof(gembird_jpd_faulty_rdesc); |
| 70 | size_t new_size = *rsize + delta_size; |
| 71 | |
| 72 | if (*rsize >= 31 && !memcmp(&rdesc[GEMBIRD_START_FAULTY_RDESC], |
| 73 | gembird_jpd_faulty_rdesc, |
| 74 | sizeof(gembird_jpd_faulty_rdesc))) { |
| 75 | new_rdesc = devm_kzalloc(&hdev->dev, new_size, GFP_KERNEL); |
| 76 | if (new_rdesc == NULL) |
| 77 | return rdesc; |
| 78 | |
| 79 | dev_info(&hdev->dev, |
| 80 | "fixing Gembird JPD-DualForce 2 report descriptor.\n"); |
| 81 | |
| 82 | /* start by copying the end of the rdesc */ |
| 83 | memcpy(new_rdesc + delta_size, rdesc, *rsize); |
| 84 | |
| 85 | /* add the correct beginning */ |
| 86 | memcpy(new_rdesc, rdesc, GEMBIRD_START_FAULTY_RDESC); |
| 87 | |
| 88 | /* replace the faulty part with the fixed one */ |
| 89 | memcpy(new_rdesc + GEMBIRD_START_FAULTY_RDESC, |
| 90 | gembird_jpd_fixed_rdesc, |
| 91 | sizeof(gembird_jpd_fixed_rdesc)); |
| 92 | |
| 93 | *rsize = new_size; |
| 94 | rdesc = new_rdesc; |
| 95 | } |
| 96 | |
| 97 | return rdesc; |
| 98 | } |
| 99 | |
| 100 | static const struct hid_device_id gembird_devices[] = { |
| 101 | { HID_USB_DEVICE(USB_VENDOR_ID_GEMBIRD, |
| 102 | USB_DEVICE_ID_GEMBIRD_JPD_DUALFORCE2) }, |
| 103 | { } |
| 104 | }; |
| 105 | MODULE_DEVICE_TABLE(hid, gembird_devices); |
| 106 | |
| 107 | static struct hid_driver gembird_driver = { |
| 108 | .name = "gembird", |
| 109 | .id_table = gembird_devices, |
| 110 | .report_fixup = gembird_report_fixup, |
| 111 | }; |
| 112 | module_hid_driver(gembird_driver); |
| 113 | |
| 114 | MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>"); |
| 115 | MODULE_DESCRIPTION("HID Gembird joypad driver"); |
| 116 | MODULE_LICENSE("GPL"); |