drivers/hid/hid-holtekff.c

   1 /*
   2  *  Force feedback support for Holtek On Line Grip based gamepads
   3  *
   4  *  These include at least a Brazilian "Clone Joypad Super Power Fire"
   5  *  which uses vendor ID 0x1241 and identifies as "HOLTEK On Line Grip".
   6  *
   7  *  Copyright (c) 2011 Anssi Hannula <anssi.hannula@iki.fi>
   8  */
   9
  10 /*
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26 #include <linux/hid.h>
  27 #include <linux/input.h>
  28 #include <linux/module.h>
  29 #include <linux/slab.h>
  30
  31 #include "hid-ids.h"
  32
  33 #ifdef CONFIG_HOLTEK_FF
  34
  35 /*
  36  * These commands and parameters are currently known:
  37  *
  38  * byte 0: command id:
  39  *      01  set effect parameters
  40  *      02  play specified effect
  41  *      03  stop specified effect
  42  *      04  stop all effects
  43  *      06  stop all effects
  44  *      (the difference between 04 and 06 isn't known; win driver
  45  *       sends 06,04 on application init, and 06 otherwise)
  46  *
  47  * Commands 01 and 02 need to be sent as pairs, i.e. you need to send 01
  48  * before each 02.
  49  *
  50  * The rest of the bytes are parameters. Command 01 takes all of them, and
  51  * commands 02,03 take only the effect id.
  52  *
  53  * byte 1:
  54  *      bits 0-3: effect id:
  55  *              1: very strong rumble
  56  *              2: periodic rumble, short intervals
  57  *              3: very strong rumble
  58  *              4: periodic rumble, long intervals
  59  *              5: weak periodic rumble, long intervals
  60  *              6: weak periodic rumble, short intervals
  61  *              7: periodic rumble, short intervals
  62  *              8: strong periodic rumble, short intervals
  63  *              9: very strong rumble
  64  *              a: causes an error
  65  *              b: very strong periodic rumble, very short intervals
  66  *              c-f: nothing
  67  *      bit 6: right (weak) motor enabled
  68  *      bit 7: left (strong) motor enabled
  69  *
  70  * bytes 2-3:  time in milliseconds, big-endian
  71  * bytes 5-6:  unknown (win driver seems to use at least 10e0 with effect 1
  72  *                     and 0014 with effect 6)
  73  * byte 7:
  74  *      bits 0-3: effect magnitude
  75  */
  76
  77 #define HOLTEKFF_MSG_LENGTH     7
  78
  79 static const u8 start_effect_1[] = { 0x02, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00 };
  80 static const u8 stop_all4[] =      { 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
  81 static const u8 stop_all6[] =      { 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
  82
  83 struct holtekff_device {
  84         struct hid_field *field;
  85 };
  86
  87 static void holtekff_send(struct holtekff_device *holtekff,
  88                           struct hid_device *hid,
  89                           const u8 data[HOLTEKFF_MSG_LENGTH])
  90 {
  91         int i;
  92
  93         for (i = 0; i < HOLTEKFF_MSG_LENGTH; i++) {
  94                 holtekff->field->value[i] = data[i];
  95         }
  96
  97         dbg_hid("sending %7ph\n", data);
  98
  99         hid_hw_request(hid, holtekff->field->report, HID_REQ_SET_REPORT);
 100 }
 101
 102 static int holtekff_play(struct input_dev *dev, void *data,
 103                          struct ff_effect *effect)
 104 {
 105         struct hid_device *hid = input_get_drvdata(dev);
 106         struct holtekff_device *holtekff = data;
 107         int left, right;
 108         /* effect type 1, length 65535 msec */
 109         u8 buf[HOLTEKFF_MSG_LENGTH] =
 110                 { 0x01, 0x01, 0xff, 0xff, 0x10, 0xe0, 0x00 };
 111
 112         left = effect->u.rumble.strong_magnitude;
 113         right = effect->u.rumble.weak_magnitude;
 114         dbg_hid("called with 0x%04x 0x%04x\n", left, right);
 115
 116         if (!left && !right) {
 117                 holtekff_send(holtekff, hid, stop_all6);
 118                 return 0;
 119         }
 120
 121         if (left)
 122                 buf[1] |= 0x80;
 123         if (right)
 124                 buf[1] |= 0x40;
 125
 126         /* The device takes a single magnitude, so we just sum them up. */
 127         buf[6] = min(0xf, (left >> 12) + (right >> 12));
 128
 129         holtekff_send(holtekff, hid, buf);
 130         holtekff_send(holtekff, hid, start_effect_1);
 131
 132         return 0;
 133 }
 134
 135 static int holtekff_init(struct hid_device *hid)
 136 {
 137         struct holtekff_device *holtekff;
 138         struct hid_report *report;
 139         struct hid_input *hidinput = list_entry(hid->inputs.next,
 140                                                 struct hid_input, list);
 141         struct list_head *report_list =
 142                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 143         struct input_dev *dev = hidinput->input;
 144         int error;
 145
 146         if (list_empty(report_list)) {
 147                 hid_err(hid, "no output report found\n");
 148                 return -ENODEV;
 149         }
 150
 151         report = list_entry(report_list->next, struct hid_report, list);
 152
 153         if (report->maxfield < 1 || report->field[0]->report_count != 7) {
 154                 hid_err(hid, "unexpected output report layout\n");
 155                 return -ENODEV;
 156         }
 157
 158         holtekff = kzalloc(sizeof(*holtekff), GFP_KERNEL);
 159         if (!holtekff)
 160                 return -ENOMEM;
 161
 162         set_bit(FF_RUMBLE, dev->ffbit);
 163
 164         holtekff->field = report->field[0];
 165
 166         /* initialize the same way as win driver does */
 167         holtekff_send(holtekff, hid, stop_all4);
 168         holtekff_send(holtekff, hid, stop_all6);
 169
 170         error = input_ff_create_memless(dev, holtekff, holtekff_play);
 171         if (error) {
 172                 kfree(holtekff);
 173                 return error;
 174         }
 175
 176         hid_info(hid, "Force feedback for Holtek On Line Grip based devices by Anssi Hannula <anssi.hannula@iki.fi>\n");
 177
 178         return 0;
 179 }
 180 #else
 181 static inline int holtekff_init(struct hid_device *hid)
 182 {
 183         return 0;
 184 }
 185 #endif
 186
 187 static int holtek_probe(struct hid_device *hdev, const struct hid_device_id *id)
 188 {
 189         int ret;
 190
 191         ret = hid_parse(hdev);
 192         if (ret) {
 193                 hid_err(hdev, "parse failed\n");
 194                 goto err;
 195         }
 196
 197         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 198         if (ret) {
 199                 hid_err(hdev, "hw start failed\n");
 200                 goto err;
 201         }
 202
 203         holtekff_init(hdev);
 204
 205         return 0;
 206 err:
 207         return ret;
 208 }
 209
 210 static const struct hid_device_id holtek_devices[] = {
 211         { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK, USB_DEVICE_ID_HOLTEK_ON_LINE_GRIP) },
 212         { }
 213 };
 214 MODULE_DEVICE_TABLE(hid, holtek_devices);
 215
 216 static struct hid_driver holtek_driver = {
 217         .name = "holtek",
 218         .id_table = holtek_devices,
 219         .probe = holtek_probe,
 220 };
 221 module_hid_driver(holtek_driver);
 222
 223 MODULE_LICENSE("GPL");
 224 MODULE_AUTHOR("Anssi Hannula <anssi.hannula@iki.fi>");
 225 MODULE_DESCRIPTION("Force feedback support for Holtek On Line Grip based devices");