LXR linux/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
  21struct zpff_device {
  22        struct hid_report *report;
  23};
  24
  25static 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
  53static int zpff_init(struct hid_device *hid)
  54{
  55        struct zpff_device *zpff;
  56        struct hid_report *report;
  57        struct hid_input *hidinput;
  58        struct input_dev *dev;
  59        int i, error;
  60
  61        if (list_empty(&hid->inputs)) {
  62                hid_err(hid, "no inputs found\n");
  63                return -ENODEV;
  64        }
  65        hidinput = list_entry(hid->inputs.next, struct hid_input, list);
  66        dev = hidinput->input;
  67
  68        for (i = 0; i < 4; i++) {
  69                report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, i, 1);
  70                if (!report)
  71                        return -ENODEV;
  72        }
  73
  74        zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
  75        if (!zpff)
  76                return -ENOMEM;
  77
  78        set_bit(FF_RUMBLE, dev->ffbit);
  79
  80        error = input_ff_create_memless(dev, zpff, zpff_play);
  81        if (error) {
  82                kfree(zpff);
  83                return error;
  84        }
  85
  86        zpff->report = report;
  87        zpff->report->field[0]->value[0] = 0x00;
  88        zpff->report->field[1]->value[0] = 0x02;
  89        zpff->report->field[2]->value[0] = 0x00;
  90        zpff->report->field[3]->value[0] = 0x00;
  91        hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);
  92
  93        hid_info(hid, "force feedback for Zeroplus based devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
  94
  95        return 0;
  96}
  97#else
  98static inline int zpff_init(struct hid_device *hid)
  99{
 100        return 0;
 101}
 102#endif
 103
 104static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 105{
 106        int ret;
 107
 108        ret = hid_parse(hdev);
 109        if (ret) {
 110                hid_err(hdev, "parse failed\n");
 111                goto err;
 112        }
 113
 114        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 115        if (ret) {
 116                hid_err(hdev, "hw start failed\n");
 117                goto err;
 118        }
 119
 120        zpff_init(hdev);
 121
 122        return 0;
 123err:
 124        return ret;
 125}
 126
 127static const struct hid_device_id zp_devices[] = {
 128        { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
 129        { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
 130        { }
 131};
 132MODULE_DEVICE_TABLE(hid, zp_devices);
 133
 134static struct hid_driver zp_driver = {
 135        .name = "zeroplus",
 136        .id_table = zp_devices,
 137        .probe = zp_probe,
 138};
 139module_hid_driver(zp_driver);
 140
 141MODULE_LICENSE("GPL");
 142