drivers/hid/hid-zpff.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Force feedback support for Zeroplus based devices
   4  *
   5  *  Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com>
   6  */
   7
   8 /*
   9  */
  10
  11
  12 #include <linux/hid.h>
  13 #include <linux/input.h>
  14 #include <linux/slab.h>
  15 #include <linux/module.h>
  16
  17 #include "hid-ids.h"
  18
  19 #ifdef CONFIG_ZEROPLUS_FF
  20
  21 struct zpff_device {
  22         struct hid_report *report;
  23 };
  24
  25 static int zpff_play(struct input_dev *dev, void *data,
  26                          struct ff_effect *effect)
  27 {
  28         struct hid_device *hid = input_get_drvdata(dev);
  29         struct zpff_device *zpff = data;
  30         int left, right;
  31
  32         /*
  33          * The following is specified the other way around in the Zeroplus
  34          * datasheet but the order below is correct for the XFX Executioner;
  35          * however it is possible that the XFX Executioner is an exception
  36          */
  37
  38         left = effect->u.rumble.strong_magnitude;
  39         right = effect->u.rumble.weak_magnitude;
  40         dbg_hid("called with 0x%04x 0x%04x\n", left, right);
  41
  42         left = left * 0x7f / 0xffff;
  43         right = right * 0x7f / 0xffff;
  44
  45         zpff->report->field[2]->value[0] = left;
  46         zpff->report->field[3]->value[0] = right;
  47         dbg_hid("running with 0x%02x 0x%02x\n", left, right);
  48         hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);
  49
  50         return 0;
  51 }
  52
  53 static int zpff_init(struct hid_device *hid)
  54 {
  55         struct zpff_device *zpff;
  56         struct hid_report *report;
  57         struct hid_input *hidinput = list_entry(hid->inputs.next,
  58                                                 struct hid_input, list);
  59         struct input_dev *dev = hidinput->input;
  60         int i, error;
  61
  62         for (i = 0; i < 4; i++) {
  63                 report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, i, 1);
  64                 if (!report)
  65                         return -ENODEV;
  66         }
  67
  68         zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
  69         if (!zpff)
  70                 return -ENOMEM;
  71
  72         set_bit(FF_RUMBLE, dev->ffbit);
  73
  74         error = input_ff_create_memless(dev, zpff, zpff_play);
  75         if (error) {
  76                 kfree(zpff);
  77                 return error;
  78         }
  79
  80         zpff->report = report;
  81         zpff->report->field[0]->value[0] = 0x00;
  82         zpff->report->field[1]->value[0] = 0x02;
  83         zpff->report->field[2]->value[0] = 0x00;
  84         zpff->report->field[3]->value[0] = 0x00;
  85         hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);
  86
  87         hid_info(hid, "force feedback for Zeroplus based devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
  88
  89         return 0;
  90 }
  91 #else
  92 static inline int zpff_init(struct hid_device *hid)
  93 {
  94         return 0;
  95 }
  96 #endif
  97
  98 static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)
  99 {
 100         int ret;
 101
 102         ret = hid_parse(hdev);
 103         if (ret) {
 104                 hid_err(hdev, "parse failed\n");
 105                 goto err;
 106         }
 107
 108         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 109         if (ret) {
 110                 hid_err(hdev, "hw start failed\n");
 111                 goto err;
 112         }
 113
 114         zpff_init(hdev);
 115
 116         return 0;
 117 err:
 118         return ret;
 119 }
 120
 121 static const struct hid_device_id zp_devices[] = {
 122         { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
 123         { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
 124         { }
 125 };
 126 MODULE_DEVICE_TABLE(hid, zp_devices);
 127
 128 static struct hid_driver zp_driver = {
 129         .name = "zeroplus",
 130         .id_table = zp_devices,
 131         .probe = zp_probe,
 132 };
 133 module_hid_driver(zp_driver);
 134
 135 MODULE_LICENSE("GPL");