drivers/hid/hid-zpff.c

   1 /*
   2  *  Force feedback support for Zeroplus based devices
   3  *
   4  *  Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com>
   5  */
   6
   7 /*
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22
  23
  24 #include <linux/hid.h>
  25 #include <linux/input.h>
  26 #include <linux/usb.h>
  27
  28 #include "hid-ids.h"
  29
  30 #include "usbhid/usbhid.h"
  31
  32 struct zpff_device {
  33         struct hid_report *report;
  34 };
  35
  36 static int zpff_play(struct input_dev *dev, void *data,
  37                          struct ff_effect *effect)
  38 {
  39         struct hid_device *hid = input_get_drvdata(dev);
  40         struct zpff_device *zpff = data;
  41         int left, right;
  42
  43         /*
  44          * The following is specified the other way around in the Zeroplus
  45          * datasheet but the order below is correct for the XFX Executioner;
  46          * however it is possible that the XFX Executioner is an exception
  47          */
  48
  49         left = effect->u.rumble.strong_magnitude;
  50         right = effect->u.rumble.weak_magnitude;
  51         dbg_hid("called with 0x%04x 0x%04x\n", left, right);
  52
  53         left = left * 0x7f / 0xffff;
  54         right = right * 0x7f / 0xffff;
  55
  56         zpff->report->field[2]->value[0] = left;
  57         zpff->report->field[3]->value[0] = right;
  58         dbg_hid("running with 0x%02x 0x%02x\n", left, right);
  59         usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
  60
  61         return 0;
  62 }
  63
  64 static int zpff_init(struct hid_device *hid)
  65 {
  66         struct zpff_device *zpff;
  67         struct hid_report *report;
  68         struct hid_input *hidinput = list_entry(hid->inputs.next,
  69                                                 struct hid_input, list);
  70         struct list_head *report_list =
  71                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  72         struct input_dev *dev = hidinput->input;
  73         int error;
  74
  75         if (list_empty(report_list)) {
  76                 dev_err(&hid->dev, "no output report found\n");
  77                 return -ENODEV;
  78         }
  79
  80         report = list_entry(report_list->next, struct hid_report, list);
  81
  82         if (report->maxfield < 4) {
  83                 dev_err(&hid->dev, "not enough fields in report\n");
  84                 return -ENODEV;
  85         }
  86
  87         zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
  88         if (!zpff)
  89                 return -ENOMEM;
  90
  91         set_bit(FF_RUMBLE, dev->ffbit);
  92
  93         error = input_ff_create_memless(dev, zpff, zpff_play);
  94         if (error) {
  95                 kfree(zpff);
  96                 return error;
  97         }
  98
  99         zpff->report = report;
 100         zpff->report->field[0]->value[0] = 0x00;
 101         zpff->report->field[1]->value[0] = 0x02;
 102         zpff->report->field[2]->value[0] = 0x00;
 103         zpff->report->field[3]->value[0] = 0x00;
 104         usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
 105
 106         dev_info(&hid->dev, "force feedback for Zeroplus based devices by "
 107                "Anssi Hannula <anssi.hannula@gmail.com>\n");
 108
 109         return 0;
 110 }
 111
 112 static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 113 {
 114         int ret;
 115
 116         ret = hid_parse(hdev);
 117         if (ret) {
 118                 dev_err(&hdev->dev, "parse failed\n");
 119                 goto err;
 120         }
 121
 122         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 123         if (ret) {
 124                 dev_err(&hdev->dev, "hw start failed\n");
 125                 goto err;
 126         }
 127
 128         zpff_init(hdev);
 129
 130         return 0;
 131 err:
 132         return ret;
 133 }
 134
 135 static const struct hid_device_id zp_devices[] = {
 136         { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
 137         { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
 138         { }
 139 };
 140 MODULE_DEVICE_TABLE(hid, zp_devices);
 141
 142 static struct hid_driver zp_driver = {
 143         .name = "zeroplus",
 144         .id_table = zp_devices,
 145         .probe = zp_probe,
 146 };
 147
 148 static int zp_init(void)
 149 {
 150         return hid_register_driver(&zp_driver);
 151 }
 152
 153 static void zp_exit(void)
 154 {
 155         hid_unregister_driver(&zp_driver);
 156 }
 157
 158 module_init(zp_init);
 159 module_exit(zp_exit);
 160 MODULE_LICENSE("GPL");