drivers/hid/hid-axff.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Force feedback support for ACRUX game controllers
   4  *
   5  * From what I have gathered, these devices are mass produced in China
   6  * by several vendors. They often share the same design as the original
   7  * Xbox 360 controller.
   8  *
   9  * 1a34:0802 "ACRUX USB GAMEPAD 8116"
  10  *  - tested with an EXEQ EQ-PCU-02090 game controller.
  11  *
  12  * Copyright (c) 2010 Sergei Kolzun <x0r@dv-life.ru>
  13  */
  14
  15 /*
  16  */
  17
  18 #include <linux/input.h>
  19 #include <linux/slab.h>
  20 #include <linux/hid.h>
  21 #include <linux/module.h>
  22
  23 #include "hid-ids.h"
  24
  25 #ifdef CONFIG_HID_ACRUX_FF
  26
  27 struct axff_device {
  28         struct hid_report *report;
  29 };
  30
  31 static int axff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
  32 {
  33         struct hid_device *hid = input_get_drvdata(dev);
  34         struct axff_device *axff = data;
  35         struct hid_report *report = axff->report;
  36         int field_count = 0;
  37         int left, right;
  38         int i, j;
  39
  40         left = effect->u.rumble.strong_magnitude;
  41         right = effect->u.rumble.weak_magnitude;
  42
  43         dbg_hid("called with 0x%04x 0x%04x", left, right);
  44
  45         left = left * 0xff / 0xffff;
  46         right = right * 0xff / 0xffff;
  47
  48         for (i = 0; i < report->maxfield; i++) {
  49                 for (j = 0; j < report->field[i]->report_count; j++) {
  50                         report->field[i]->value[j] =
  51                                 field_count % 2 ? right : left;
  52                         field_count++;
  53                 }
  54         }
  55
  56         dbg_hid("running with 0x%02x 0x%02x", left, right);
  57         hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT);
  58
  59         return 0;
  60 }
  61
  62 static int axff_init(struct hid_device *hid)
  63 {
  64         struct axff_device *axff;
  65         struct hid_report *report;
  66         struct hid_input *hidinput = list_first_entry(&hid->inputs, struct hid_input, list);
  67         struct list_head *report_list =&hid->report_enum[HID_OUTPUT_REPORT].report_list;
  68         struct input_dev *dev = hidinput->input;
  69         int field_count = 0;
  70         int i, j;
  71         int error;
  72
  73         if (list_empty(report_list)) {
  74                 hid_err(hid, "no output reports found\n");
  75                 return -ENODEV;
  76         }
  77
  78         report = list_first_entry(report_list, struct hid_report, list);
  79         for (i = 0; i < report->maxfield; i++) {
  80                 for (j = 0; j < report->field[i]->report_count; j++) {
  81                         report->field[i]->value[j] = 0x00;
  82                         field_count++;
  83                 }
  84         }
  85
  86         if (field_count < 4 && hid->product != 0xf705) {
  87                 hid_err(hid, "not enough fields in the report: %d\n",
  88                         field_count);
  89                 return -ENODEV;
  90         }
  91
  92         axff = kzalloc(sizeof(struct axff_device), GFP_KERNEL);
  93         if (!axff)
  94                 return -ENOMEM;
  95
  96         set_bit(FF_RUMBLE, dev->ffbit);
  97
  98         error = input_ff_create_memless(dev, axff, axff_play);
  99         if (error)
 100                 goto err_free_mem;
 101
 102         axff->report = report;
 103         hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT);
 104
 105         hid_info(hid, "Force Feedback for ACRUX game controllers by Sergei Kolzun <x0r@dv-life.ru>\n");
 106
 107         return 0;
 108
 109 err_free_mem:
 110         kfree(axff);
 111         return error;
 112 }
 113 #else
 114 static inline int axff_init(struct hid_device *hid)
 115 {
 116         return 0;
 117 }
 118 #endif
 119
 120 static int ax_probe(struct hid_device *hdev, const struct hid_device_id *id)
 121 {
 122         int error;
 123
 124         dev_dbg(&hdev->dev, "ACRUX HID hardware probe...\n");
 125
 126         error = hid_parse(hdev);
 127         if (error) {
 128                 hid_err(hdev, "parse failed\n");
 129                 return error;
 130         }
 131
 132         error = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 133         if (error) {
 134                 hid_err(hdev, "hw start failed\n");
 135                 return error;
 136         }
 137
 138         error = axff_init(hdev);
 139         if (error) {
 140                 /*
 141                  * Do not fail device initialization completely as device
 142                  * may still be partially operable, just warn.
 143                  */
 144                 hid_warn(hdev,
 145                          "Failed to enable force feedback support, error: %d\n",
 146                          error);
 147         }
 148
 149         /*
 150          * We need to start polling device right away, otherwise
 151          * it will go into a coma.
 152          */
 153         error = hid_hw_open(hdev);
 154         if (error) {
 155                 dev_err(&hdev->dev, "hw open failed\n");
 156                 hid_hw_stop(hdev);
 157                 return error;
 158         }
 159
 160         return 0;
 161 }
 162
 163 static void ax_remove(struct hid_device *hdev)
 164 {
 165         hid_hw_close(hdev);
 166         hid_hw_stop(hdev);
 167 }
 168
 169 static const struct hid_device_id ax_devices[] = {
 170         { HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0x0802), },
 171         { HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0xf705), },
 172         { }
 173 };
 174 MODULE_DEVICE_TABLE(hid, ax_devices);
 175
 176 static struct hid_driver ax_driver = {
 177         .name           = "acrux",
 178         .id_table       = ax_devices,
 179         .probe          = ax_probe,
 180         .remove         = ax_remove,
 181 };
 182 module_hid_driver(ax_driver);
 183
 184 MODULE_AUTHOR("Sergei Kolzun");
 185 MODULE_DESCRIPTION("Force feedback support for ACRUX game controllers");
 186 MODULE_LICENSE("GPL");