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/module.h>
  28
  29 #include "hid-ids.h"
  30
  31 #ifdef CONFIG_ZEROPLUS_FF
  32
  33 struct zpff_device {
  34         struct hid_report *report;
  35 };
  36
  37 static int zpff_play(struct input_dev *dev, void *data,
  38                          struct ff_effect *effect)
  39 {
  40         struct hid_device *hid = input_get_drvdata(dev);
  41         struct zpff_device *zpff = data;
  42         int left, right;
  43
  44         /*
  45          * The following is specified the other way around in the Zeroplus
  46          * datasheet but the order below is correct for the XFX Executioner;
  47          * however it is possible that the XFX Executioner is an exception
  48          */
  49
  50         left = effect->u.rumble.strong_magnitude;
  51         right = effect->u.rumble.weak_magnitude;
  52         dbg_hid("called with 0x%04x 0x%04x\n", left, right);
  53
  54         left = left * 0x7f / 0xffff;
  55         right = right * 0x7f / 0xffff;
  56
  57         zpff->report->field[2]->value[0] = left;
  58         zpff->report->field[3]->value[0] = right;
  59         dbg_hid("running with 0x%02x 0x%02x\n", left, right);
  60         hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);
  61
  62         return 0;
  63 }
  64
  65 static int zpff_init(struct hid_device *hid)
  66 {
  67         struct zpff_device *zpff;
  68         struct hid_report *report;
  69         struct hid_input *hidinput;
  70         struct input_dev *dev;
  71         int i, error;
  72
  73         if (list_empty(&hid->inputs)) {
  74                 hid_err(hid, "no inputs found\n");
  75                 return -ENODEV;
  76         }
  77         hidinput = list_entry(hid->inputs.next, struct hid_input, list);
  78         dev = hidinput->input;
  79
  80         for (i = 0; i < 4; i++) {
  81                 report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, i, 1);
  82                 if (!report)
  83                         return -ENODEV;
  84         }
  85
  86         zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
  87         if (!zpff)
  88                 return -ENOMEM;
  89
  90         set_bit(FF_RUMBLE, dev->ffbit);
  91
  92         error = input_ff_create_memless(dev, zpff, zpff_play);
  93         if (error) {
  94                 kfree(zpff);
  95                 return error;
  96         }
  97
  98         zpff->report = report;
  99         zpff->report->field[0]->value[0] = 0x00;
 100         zpff->report->field[1]->value[0] = 0x02;
 101         zpff->report->field[2]->value[0] = 0x00;
 102         zpff->report->field[3]->value[0] = 0x00;
 103         hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);
 104
 105         hid_info(hid, "force feedback for Zeroplus based devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
 106
 107         return 0;
 108 }
 109 #else
 110 static inline int zpff_init(struct hid_device *hid)
 111 {
 112         return 0;
 113 }
 114 #endif
 115
 116 static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 117 {
 118         int ret;
 119
 120         ret = hid_parse(hdev);
 121         if (ret) {
 122                 hid_err(hdev, "parse failed\n");
 123                 goto err;
 124         }
 125
 126         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 127         if (ret) {
 128                 hid_err(hdev, "hw start failed\n");
 129                 goto err;
 130         }
 131
 132         zpff_init(hdev);
 133
 134         return 0;
 135 err:
 136         return ret;
 137 }
 138
 139 static const struct hid_device_id zp_devices[] = {
 140         { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
 141         { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
 142         { }
 143 };
 144 MODULE_DEVICE_TABLE(hid, zp_devices);
 145
 146 static struct hid_driver zp_driver = {
 147         .name = "zeroplus",
 148         .id_table = zp_devices,
 149         .probe = zp_probe,
 150 };
 151 module_hid_driver(zp_driver);
 152
 153 MODULE_LICENSE("GPL");