drivers/hid/hid-gaff.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  Force feedback support for GreenAsia (Product ID 0x12) based devices
0004  *
0005  *  The devices are distributed under various names and the same USB device ID
0006  *  can be used in many game controllers.
0007  *
0008  *  0e8f:0012 "GreenAsia Inc.    USB Joystick     "
0009  *   - tested with MANTA Warior MM816 and SpeedLink Strike2 SL-6635.
0010  *
0011  *  Copyright (c) 2008 Lukasz Lubojanski <lukasz@lubojanski.info>
0012  */
0013
0014 /*
0015  */
0016
0017 #include <linux/input.h>
0018 #include <linux/slab.h>
0019 #include <linux/hid.h>
0020 #include <linux/module.h>
0021 #include "hid-ids.h"
0022
0023 #ifdef CONFIG_GREENASIA_FF
0024
0025 struct gaff_device {
0026     struct hid_report *report;
0027 };
0028
0029 static int hid_gaff_play(struct input_dev *dev, void *data,
0030              struct ff_effect *effect)
0031 {
0032     struct hid_device *hid = input_get_drvdata(dev);
0033     struct gaff_device *gaff = data;
0034     int left, right;
0035
0036     left = effect->u.rumble.strong_magnitude;
0037     right = effect->u.rumble.weak_magnitude;
0038
0039     dbg_hid("called with 0x%04x 0x%04x", left, right);
0040
0041     left = left * 0xfe / 0xffff;
0042     right = right * 0xfe / 0xffff;
0043
0044     gaff->report->field[0]->value[0] = 0x51;
0045     gaff->report->field[0]->value[1] = 0x0;
0046     gaff->report->field[0]->value[2] = right;
0047     gaff->report->field[0]->value[3] = 0;
0048     gaff->report->field[0]->value[4] = left;
0049     gaff->report->field[0]->value[5] = 0;
0050     dbg_hid("running with 0x%02x 0x%02x", left, right);
0051     hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
0052
0053     gaff->report->field[0]->value[0] = 0xfa;
0054     gaff->report->field[0]->value[1] = 0xfe;
0055     gaff->report->field[0]->value[2] = 0x0;
0056     gaff->report->field[0]->value[4] = 0x0;
0057
0058     hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
0059
0060     return 0;
0061 }
0062
0063 static int gaff_init(struct hid_device *hid)
0064 {
0065     struct gaff_device *gaff;
0066     struct hid_report *report;
0067     struct hid_input *hidinput;
0068     struct list_head *report_list =
0069             &hid->report_enum[HID_OUTPUT_REPORT].report_list;
0070     struct list_head *report_ptr = report_list;
0071     struct input_dev *dev;
0072     int error;
0073
0074     if (list_empty(&hid->inputs)) {
0075         hid_err(hid, "no inputs found\n");
0076         return -ENODEV;
0077     }
0078     hidinput = list_entry(hid->inputs.next, struct hid_input, list);
0079     dev = hidinput->input;
0080
0081     if (list_empty(report_list)) {
0082         hid_err(hid, "no output reports found\n");
0083         return -ENODEV;
0084     }
0085
0086     report_ptr = report_ptr->next;
0087
0088     report = list_entry(report_ptr, struct hid_report, list);
0089     if (report->maxfield < 1) {
0090         hid_err(hid, "no fields in the report\n");
0091         return -ENODEV;
0092     }
0093
0094     if (report->field[0]->report_count < 6) {
0095         hid_err(hid, "not enough values in the field\n");
0096         return -ENODEV;
0097     }
0098
0099     gaff = kzalloc(sizeof(struct gaff_device), GFP_KERNEL);
0100     if (!gaff)
0101         return -ENOMEM;
0102
0103     set_bit(FF_RUMBLE, dev->ffbit);
0104
0105     error = input_ff_create_memless(dev, gaff, hid_gaff_play);
0106     if (error) {
0107         kfree(gaff);
0108         return error;
0109     }
0110
0111     gaff->report = report;
0112     gaff->report->field[0]->value[0] = 0x51;
0113     gaff->report->field[0]->value[1] = 0x00;
0114     gaff->report->field[0]->value[2] = 0x00;
0115     gaff->report->field[0]->value[3] = 0x00;
0116     hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
0117
0118     gaff->report->field[0]->value[0] = 0xfa;
0119     gaff->report->field[0]->value[1] = 0xfe;
0120
0121     hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
0122
0123     hid_info(hid, "Force Feedback for GreenAsia 0x12 devices by Lukasz Lubojanski <lukasz@lubojanski.info>\n");
0124
0125     return 0;
0126 }
0127 #else
0128 static inline int gaff_init(struct hid_device *hdev)
0129 {
0130     return 0;
0131 }
0132 #endif
0133
0134 static int ga_probe(struct hid_device *hdev, const struct hid_device_id *id)
0135 {
0136     int ret;
0137
0138     dev_dbg(&hdev->dev, "Greenasia HID hardware probe...");
0139
0140     ret = hid_parse(hdev);
0141     if (ret) {
0142         hid_err(hdev, "parse failed\n");
0143         goto err;
0144     }
0145
0146     ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
0147     if (ret) {
0148         hid_err(hdev, "hw start failed\n");
0149         goto err;
0150     }
0151
0152     gaff_init(hdev);
0153
0154     return 0;
0155 err:
0156     return ret;
0157 }
0158
0159 static const struct hid_device_id ga_devices[] = {
0160     { HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012),  },
0161     { }
0162 };
0163 MODULE_DEVICE_TABLE(hid, ga_devices);
0164
0165 static struct hid_driver ga_driver = {
0166     .name = "greenasia",
0167     .id_table = ga_devices,
0168     .probe = ga_probe,
0169 };
0170 module_hid_driver(ga_driver);
0171
0172 MODULE_LICENSE("GPL");