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/slab.h>
  27 #include <linux/usb.h>
  28
  29 #include "hid-ids.h"
  30
  31 #ifdef CONFIG_ZEROPLUS_FF
  32 #include "usbhid/usbhid.h"
  33
  34 struct zpff_device {
  35         struct hid_report *report;
  36 };
  37
  38 static int zpff_play(struct input_dev *dev, void *data,
  39                          struct ff_effect *effect)
  40 {
  41         struct hid_device *hid = input_get_drvdata(dev);
  42         struct zpff_device *zpff = data;
  43         int left, right;
  44
  45         /*
  46          * The following is specified the other way around in the Zeroplus
  47          * datasheet but the order below is correct for the XFX Executioner;
  48          * however it is possible that the XFX Executioner is an exception
  49          */
  50
  51         left = effect->u.rumble.strong_magnitude;
  52         right = effect->u.rumble.weak_magnitude;
  53         dbg_hid("called with 0x%04x 0x%04x\n", left, right);
  54
  55         left = left * 0x7f / 0xffff;
  56         right = right * 0x7f / 0xffff;
  57
  58         zpff->report->field[2]->value[0] = left;
  59         zpff->report->field[3]->value[0] = right;
  60         dbg_hid("running with 0x%02x 0x%02x\n", left, right);
  61         usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
  62
  63         return 0;
  64 }
  65
  66 static int zpff_init(struct hid_device *hid)
  67 {
  68         struct zpff_device *zpff;
  69         struct hid_report *report;
  70         struct hid_input *hidinput = list_entry(hid->inputs.next,
  71                                                 struct hid_input, list);
  72         struct list_head *report_list =
  73                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  74         struct input_dev *dev = hidinput->input;
  75         int error;
  76
  77         if (list_empty(report_list)) {
  78                 dev_err(&hid->dev, "no output report found\n");
  79                 return -ENODEV;
  80         }
  81
  82         report = list_entry(report_list->next, struct hid_report, list);
  83
  84         if (report->maxfield < 4) {
  85                 dev_err(&hid->dev, "not enough fields in report\n");
  86                 return -ENODEV;
  87         }
  88
  89         zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
  90         if (!zpff)
  91                 return -ENOMEM;
  92
  93         set_bit(FF_RUMBLE, dev->ffbit);
  94
  95         error = input_ff_create_memless(dev, zpff, zpff_play);
  96         if (error) {
  97                 kfree(zpff);
  98                 return error;
  99         }
 100
 101         zpff->report = report;
 102         zpff->report->field[0]->value[0] = 0x00;
 103         zpff->report->field[1]->value[0] = 0x02;
 104         zpff->report->field[2]->value[0] = 0x00;
 105         zpff->report->field[3]->value[0] = 0x00;
 106         usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
 107
 108         dev_info(&hid->dev, "force feedback for Zeroplus based devices by "
 109                "Anssi Hannula <anssi.hannula@gmail.com>\n");
 110
 111         return 0;
 112 }
 113 #else
 114 static inline int zpff_init(struct hid_device *hid)
 115 {
 116         return 0;
 117 }
 118 #endif
 119
 120 static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 121 {
 122         int ret;
 123
 124         ret = hid_parse(hdev);
 125         if (ret) {
 126                 dev_err(&hdev->dev, "parse failed\n");
 127                 goto err;
 128         }
 129
 130         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 131         if (ret) {
 132                 dev_err(&hdev->dev, "hw start failed\n");
 133                 goto err;
 134         }
 135
 136         zpff_init(hdev);
 137
 138         return 0;
 139 err:
 140         return ret;
 141 }
 142
 143 static const struct hid_device_id zp_devices[] = {
 144         { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
 145         { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
 146         { }
 147 };
 148 MODULE_DEVICE_TABLE(hid, zp_devices);
 149
 150 static struct hid_driver zp_driver = {
 151         .name = "zeroplus",
 152         .id_table = zp_devices,
 153         .probe = zp_probe,
 154 };
 155
 156 static int __init zp_init(void)
 157 {
 158         return hid_register_driver(&zp_driver);
 159 }
 160
 161 static void __exit zp_exit(void)
 162 {
 163         hid_unregister_driver(&zp_driver);
 164 }
 165
 166 module_init(zp_init);
 167 module_exit(zp_exit);
 168 MODULE_LICENSE("GPL");