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Linux/drivers/hid/hid-saitek.c

  1 /*
  2  *  HID driver for Saitek devices.
  3  *
  4  *  PS1000 (USB gamepad):
  5  *  Fixes the HID report descriptor by removing a non-existent axis and
  6  *  clearing the constant bit on the input reports for buttons and d-pad.
  7  *  (This module is based on "hid-ortek".)
  8  *  Copyright (c) 2012 Andreas Hübner
  9  *
 10  *  R.A.T.7, M.M.O.7 (USB gaming mice):
 11  *  Fixes the mode button which cycles through three constantly pressed
 12  *  buttons. All three press events are mapped to one button and the
 13  *  missing release event is generated immediately.
 14  *
 15  */
 16 
 17 /*
 18  * This program is free software; you can redistribute it and/or modify it
 19  * under the terms of the GNU General Public License as published by the Free
 20  * Software Foundation; either version 2 of the License, or (at your option)
 21  * any later version.
 22  */
 23 
 24 #include <linux/device.h>
 25 #include <linux/hid.h>
 26 #include <linux/module.h>
 27 #include <linux/kernel.h>
 28 
 29 #include "hid-ids.h"
 30 
 31 #define SAITEK_FIX_PS1000       0x0001
 32 #define SAITEK_RELEASE_MODE_RAT7        0x0002
 33 #define SAITEK_RELEASE_MODE_MMO7        0x0004
 34 
 35 struct saitek_sc {
 36         unsigned long quirks;
 37         int mode;
 38 };
 39 
 40 static int saitek_probe(struct hid_device *hdev,
 41                 const struct hid_device_id *id)
 42 {
 43         unsigned long quirks = id->driver_data;
 44         struct saitek_sc *ssc;
 45         int ret;
 46 
 47         ssc = devm_kzalloc(&hdev->dev, sizeof(*ssc), GFP_KERNEL);
 48         if (ssc == NULL) {
 49                 hid_err(hdev, "can't alloc saitek descriptor\n");
 50                 return -ENOMEM;
 51         }
 52 
 53         ssc->quirks = quirks;
 54         ssc->mode = -1;
 55 
 56         hid_set_drvdata(hdev, ssc);
 57 
 58         ret = hid_parse(hdev);
 59         if (ret) {
 60                 hid_err(hdev, "parse failed\n");
 61                 return ret;
 62         }
 63 
 64         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 65         if (ret) {
 66                 hid_err(hdev, "hw start failed\n");
 67                 return ret;
 68         }
 69 
 70         return 0;
 71 }
 72 
 73 static __u8 *saitek_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 74                 unsigned int *rsize)
 75 {
 76         struct saitek_sc *ssc = hid_get_drvdata(hdev);
 77 
 78         if ((ssc->quirks & SAITEK_FIX_PS1000) && *rsize == 137 &&
 79                         rdesc[20] == 0x09 && rdesc[21] == 0x33 &&
 80                         rdesc[94] == 0x81 && rdesc[95] == 0x03 &&
 81                         rdesc[110] == 0x81 && rdesc[111] == 0x03) {
 82 
 83                 hid_info(hdev, "Fixing up Saitek PS1000 report descriptor\n");
 84 
 85                 /* convert spurious axis to a "noop" Logical Minimum (0) */
 86                 rdesc[20] = 0x15;
 87                 rdesc[21] = 0x00;
 88 
 89                 /* clear constant bit on buttons and d-pad */
 90                 rdesc[95] = 0x02;
 91                 rdesc[111] = 0x02;
 92 
 93         }
 94         return rdesc;
 95 }
 96 
 97 static int saitek_raw_event(struct hid_device *hdev,
 98                 struct hid_report *report, u8 *raw_data, int size)
 99 {
100         struct saitek_sc *ssc = hid_get_drvdata(hdev);
101 
102         if (ssc->quirks & SAITEK_RELEASE_MODE_RAT7 && size == 7) {
103                 /* R.A.T.7 uses bits 13, 14, 15 for the mode */
104                 int mode = -1;
105                 if (raw_data[1] & 0x01)
106                         mode = 0;
107                 else if (raw_data[1] & 0x02)
108                         mode = 1;
109                 else if (raw_data[1] & 0x04)
110                         mode = 2;
111 
112                 /* clear mode bits */
113                 raw_data[1] &= ~0x07;
114 
115                 if (mode != ssc->mode) {
116                         hid_dbg(hdev, "entered mode %d\n", mode);
117                         if (ssc->mode != -1) {
118                                 /* use bit 13 as the mode button */
119                                 raw_data[1] |= 0x04;
120                         }
121                         ssc->mode = mode;
122                 }
123         } else if (ssc->quirks & SAITEK_RELEASE_MODE_MMO7 && size == 8) {
124 
125                 /* M.M.O.7 uses bits 8, 22, 23 for the mode */
126                 int mode = -1;
127                 if (raw_data[1] & 0x80)
128                         mode = 0;
129                 else if (raw_data[2] & 0x01)
130                         mode = 1;
131                 else if (raw_data[2] & 0x02)
132                         mode = 2;
133 
134                 /* clear mode bits */
135                 raw_data[1] &= ~0x80;
136                 raw_data[2] &= ~0x03;
137 
138                 if (mode != ssc->mode) {
139                         hid_dbg(hdev, "entered mode %d\n", mode);
140                         if (ssc->mode != -1) {
141                                 /* use bit 8 as the mode button, bits 22
142                                  * and 23 do not represent buttons
143                                  * according to the HID report descriptor
144                                  */
145                                 raw_data[1] |= 0x80;
146                         }
147                         ssc->mode = mode;
148                 }
149         }
150 
151         return 0;
152 }
153 
154 static int saitek_event(struct hid_device *hdev, struct hid_field *field,
155                 struct hid_usage *usage, __s32 value)
156 {
157         struct saitek_sc *ssc = hid_get_drvdata(hdev);
158         struct input_dev *input = field->hidinput->input;
159 
160         if (usage->type == EV_KEY && value &&
161                         (((ssc->quirks & SAITEK_RELEASE_MODE_RAT7) &&
162                           usage->code - BTN_MOUSE == 10) ||
163                         ((ssc->quirks & SAITEK_RELEASE_MODE_MMO7) &&
164                          usage->code - BTN_MOUSE == 15))) {
165 
166                 input_report_key(input, usage->code, 1);
167 
168                 /* report missing release event */
169                 input_report_key(input, usage->code, 0);
170 
171                 return 1;
172         }
173 
174         return 0;
175 }
176 
177 static const struct hid_device_id saitek_devices[] = {
178         { HID_USB_DEVICE(USB_VENDOR_ID_SAITEK, USB_DEVICE_ID_SAITEK_PS1000),
179                 .driver_data = SAITEK_FIX_PS1000 },
180         { HID_USB_DEVICE(USB_VENDOR_ID_SAITEK, USB_DEVICE_ID_SAITEK_RAT7),
181                 .driver_data = SAITEK_RELEASE_MODE_RAT7 },
182         { HID_USB_DEVICE(USB_VENDOR_ID_SAITEK, USB_DEVICE_ID_SAITEK_MMO7),
183                 .driver_data = SAITEK_RELEASE_MODE_MMO7 },
184         { }
185 };
186 
187 MODULE_DEVICE_TABLE(hid, saitek_devices);
188 
189 static struct hid_driver saitek_driver = {
190         .name = "saitek",
191         .id_table = saitek_devices,
192         .probe = saitek_probe,
193         .report_fixup = saitek_report_fixup,
194         .raw_event = saitek_raw_event,
195         .event = saitek_event,
196 };
197 module_hid_driver(saitek_driver);
198 
199 MODULE_LICENSE("GPL");
200 

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