LXR linux/drivers/hid/hid-gaff.c

   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
  25struct gaff_device {
  26        struct hid_report *report;
  27};
  28
  29static 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
  63static int gaff_init(struct hid_device *hid)
  64{
  65        struct gaff_device *gaff;
  66        struct hid_report *report;
  67        struct hid_input *hidinput = list_entry(hid->inputs.next,
  68                                                struct hid_input, list);
  69        struct list_head *report_list =
  70                        &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  71        struct list_head *report_ptr = report_list;
  72        struct input_dev *dev = hidinput->input;
  73        int error;
  74
  75        if (list_empty(report_list)) {
  76                hid_err(hid, "no output reports found\n");
  77                return -ENODEV;
  78        }
  79
  80        report_ptr = report_ptr->next;
  81
  82        report = list_entry(report_ptr, struct hid_report, list);
  83        if (report->maxfield < 1) {
  84                hid_err(hid, "no fields in the report\n");
  85                return -ENODEV;
  86        }
  87
  88        if (report->field[0]->report_count < 6) {
  89                hid_err(hid, "not enough values in the field\n");
  90                return -ENODEV;
  91        }
  92
  93        gaff = kzalloc(sizeof(struct gaff_device), GFP_KERNEL);
  94        if (!gaff)
  95                return -ENOMEM;
  96
  97        set_bit(FF_RUMBLE, dev->ffbit);
  98
  99        error = input_ff_create_memless(dev, gaff, hid_gaff_play);
 100        if (error) {
 101                kfree(gaff);
 102                return error;
 103        }
 104
 105        gaff->report = report;
 106        gaff->report->field[0]->value[0] = 0x51;
 107        gaff->report->field[0]->value[1] = 0x00;
 108        gaff->report->field[0]->value[2] = 0x00;
 109        gaff->report->field[0]->value[3] = 0x00;
 110        hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
 111
 112        gaff->report->field[0]->value[0] = 0xfa;
 113        gaff->report->field[0]->value[1] = 0xfe;
 114
 115        hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
 116
 117        hid_info(hid, "Force Feedback for GreenAsia 0x12 devices by Lukasz Lubojanski <lukasz@lubojanski.info>\n");
 118
 119        return 0;
 120}
 121#else
 122static inline int gaff_init(struct hid_device *hdev)
 123{
 124        return 0;
 125}
 126#endif
 127
 128static int ga_probe(struct hid_device *hdev, const struct hid_device_id *id)
 129{
 130        int ret;
 131
 132        dev_dbg(&hdev->dev, "Greenasia HID hardware probe...");
 133
 134        ret = hid_parse(hdev);
 135        if (ret) {
 136                hid_err(hdev, "parse failed\n");
 137                goto err;
 138        }
 139
 140        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 141        if (ret) {
 142                hid_err(hdev, "hw start failed\n");
 143                goto err;
 144        }
 145
 146        gaff_init(hdev);
 147
 148        return 0;
 149err:
 150        return ret;
 151}
 152
 153static const struct hid_device_id ga_devices[] = {
 154        { HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012),  },
 155        { }
 156};
 157MODULE_DEVICE_TABLE(hid, ga_devices);
 158
 159static struct hid_driver ga_driver = {
 160        .name = "greenasia",
 161        .id_table = ga_devices,
 162        .probe = ga_probe,
 163};
 164module_hid_driver(ga_driver);
 165
 166MODULE_LICENSE("GPL");
 167