root/drivers/hid/hid-gaff.c

DEFINITIONS

1. hid_gaff_play
2. gaff_init
3. gaff_init
4. ga_probe

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Force feedback support for GreenAsia (Product ID 0x12) based devices
   4  *
   5  *  The devices are distributed under various names and the same USB device ID
   6  *  can be used in many game controllers.
   7  *
   8  *  0e8f:0012 "GreenAsia Inc.    USB Joystick     "
   9  *   - tested with MANTA Warior MM816 and SpeedLink Strike2 SL-6635.
  10  *
  11  *  Copyright (c) 2008 Lukasz Lubojanski <lukasz@lubojanski.info>
  12  */
  13 
  14 /*
  15  */
  16 
  17 #include <linux/input.h>
  18 #include <linux/slab.h>
  19 #include <linux/hid.h>
  20 #include <linux/module.h>
  21 #include "hid-ids.h"
  22 
  23 #ifdef CONFIG_GREENASIA_FF
  24 
  25 struct gaff_device {
  26         struct hid_report *report;
  27 };
  28 
  29 static int hid_gaff_play(struct input_dev *dev, void *data,
  30                          struct ff_effect *effect)
  31 {
  32         struct hid_device *hid = input_get_drvdata(dev);
  33         struct gaff_device *gaff = data;
  34         int left, right;
  35 
  36         left = effect->u.rumble.strong_magnitude;
  37         right = effect->u.rumble.weak_magnitude;
  38 
  39         dbg_hid("called with 0x%04x 0x%04x", left, right);
  40 
  41         left = left * 0xfe / 0xffff;
  42         right = right * 0xfe / 0xffff;
  43 
  44         gaff->report->field[0]->value[0] = 0x51;
  45         gaff->report->field[0]->value[1] = 0x0;
  46         gaff->report->field[0]->value[2] = right;
  47         gaff->report->field[0]->value[3] = 0;
  48         gaff->report->field[0]->value[4] = left;
  49         gaff->report->field[0]->value[5] = 0;
  50         dbg_hid("running with 0x%02x 0x%02x", left, right);
  51         hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
  52 
  53         gaff->report->field[0]->value[0] = 0xfa;
  54         gaff->report->field[0]->value[1] = 0xfe;
  55         gaff->report->field[0]->value[2] = 0x0;
  56         gaff->report->field[0]->value[4] = 0x0;
  57 
  58         hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
  59 
  60         return 0;
  61 }
  62 
  63 static int gaff_init(struct hid_device *hid)
  64 {
  65         struct gaff_device *gaff;
  66         struct hid_report *report;
  67         struct hid_input *hidinput;
  68         struct list_head *report_list =
  69                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  70         struct list_head *report_ptr = report_list;
  71         struct input_dev *dev;
  72         int error;
  73 
  74         if (list_empty(&hid->inputs)) {
  75                 hid_err(hid, "no inputs found\n");
  76                 return -ENODEV;
  77         }
  78         hidinput = list_entry(hid->inputs.next, struct hid_input, list);
  79         dev = hidinput->input;
  80 
  81         if (list_empty(report_list)) {
  82                 hid_err(hid, "no output reports found\n");
  83                 return -ENODEV;
  84         }
  85 
  86         report_ptr = report_ptr->next;
  87 
  88         report = list_entry(report_ptr, struct hid_report, list);
  89         if (report->maxfield < 1) {
  90                 hid_err(hid, "no fields in the report\n");
  91                 return -ENODEV;
  92         }
  93 
  94         if (report->field[0]->report_count < 6) {
  95                 hid_err(hid, "not enough values in the field\n");
  96                 return -ENODEV;
  97         }
  98 
  99         gaff = kzalloc(sizeof(struct gaff_device), GFP_KERNEL);
 100         if (!gaff)
 101                 return -ENOMEM;
 102 
 103         set_bit(FF_RUMBLE, dev->ffbit);
 104 
 105         error = input_ff_create_memless(dev, gaff, hid_gaff_play);
 106         if (error) {
 107                 kfree(gaff);
 108                 return error;
 109         }
 110 
 111         gaff->report = report;
 112         gaff->report->field[0]->value[0] = 0x51;
 113         gaff->report->field[0]->value[1] = 0x00;
 114         gaff->report->field[0]->value[2] = 0x00;
 115         gaff->report->field[0]->value[3] = 0x00;
 116         hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
 117 
 118         gaff->report->field[0]->value[0] = 0xfa;
 119         gaff->report->field[0]->value[1] = 0xfe;
 120 
 121         hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
 122 
 123         hid_info(hid, "Force Feedback for GreenAsia 0x12 devices by Lukasz Lubojanski <lukasz@lubojanski.info>\n");
 124 
 125         return 0;
 126 }
 127 #else
 128 static inline int gaff_init(struct hid_device *hdev)
 129 {
 130         return 0;
 131 }
 132 #endif
 133 
 134 static int ga_probe(struct hid_device *hdev, const struct hid_device_id *id)
 135 {
 136         int ret;
 137 
 138         dev_dbg(&hdev->dev, "Greenasia HID hardware probe...");
 139 
 140         ret = hid_parse(hdev);
 141         if (ret) {
 142                 hid_err(hdev, "parse failed\n");
 143                 goto err;
 144         }
 145 
 146         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 147         if (ret) {
 148                 hid_err(hdev, "hw start failed\n");
 149                 goto err;
 150         }
 151 
 152         gaff_init(hdev);
 153 
 154         return 0;
 155 err:
 156         return ret;
 157 }
 158 
 159 static const struct hid_device_id ga_devices[] = {
 160         { HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012),  },
 161         { }
 162 };
 163 MODULE_DEVICE_TABLE(hid, ga_devices);
 164 
 165 static struct hid_driver ga_driver = {
 166         .name = "greenasia",
 167         .id_table = ga_devices,
 168         .probe = ga_probe,
 169 };
 170 module_hid_driver(ga_driver);
 171 
 172 MODULE_LICENSE("GPL");