Add linux-next specific files for 20110831
[linux-2.6/next.git] / drivers / hid / hid-emsff.c
blob9bdde867a02fbad7a6b163d82babb9376dc1f78f
1 /*
2 * Force feedback support for EMS Trio Linker Plus II
4 * Copyright (c) 2010 Ignaz Forster <ignaz.forster@gmx.de>
5 */
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.
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.
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
24 #include <linux/hid.h>
25 #include <linux/input.h>
26 #include <linux/usb.h>
27 #include <linux/module.h>
29 #include "hid-ids.h"
30 #include "usbhid/usbhid.h"
32 struct emsff_device {
33 struct hid_report *report;
36 static int emsff_play(struct input_dev *dev, void *data,
37 struct ff_effect *effect)
39 struct hid_device *hid = input_get_drvdata(dev);
40 struct emsff_device *emsff = data;
41 int weak, strong;
43 weak = effect->u.rumble.weak_magnitude;
44 strong = effect->u.rumble.strong_magnitude;
46 dbg_hid("called with 0x%04x 0x%04x\n", strong, weak);
48 weak = weak * 0xff / 0xffff;
49 strong = strong * 0xff / 0xffff;
51 emsff->report->field[0]->value[1] = weak;
52 emsff->report->field[0]->value[2] = strong;
54 dbg_hid("running with 0x%02x 0x%02x\n", strong, weak);
55 usbhid_submit_report(hid, emsff->report, USB_DIR_OUT);
57 return 0;
60 static int emsff_init(struct hid_device *hid)
62 struct emsff_device *emsff;
63 struct hid_report *report;
64 struct hid_input *hidinput = list_first_entry(&hid->inputs,
65 struct hid_input, list);
66 struct list_head *report_list =
67 &hid->report_enum[HID_OUTPUT_REPORT].report_list;
68 struct input_dev *dev = hidinput->input;
69 int error;
71 if (list_empty(report_list)) {
72 hid_err(hid, "no output reports found\n");
73 return -ENODEV;
76 report = list_first_entry(report_list, struct hid_report, list);
77 if (report->maxfield < 1) {
78 hid_err(hid, "no fields in the report\n");
79 return -ENODEV;
82 if (report->field[0]->report_count < 7) {
83 hid_err(hid, "not enough values in the field\n");
84 return -ENODEV;
87 emsff = kzalloc(sizeof(struct emsff_device), GFP_KERNEL);
88 if (!emsff)
89 return -ENOMEM;
91 set_bit(FF_RUMBLE, dev->ffbit);
93 error = input_ff_create_memless(dev, emsff, emsff_play);
94 if (error) {
95 kfree(emsff);
96 return error;
99 emsff->report = report;
100 emsff->report->field[0]->value[0] = 0x01;
101 emsff->report->field[0]->value[1] = 0x00;
102 emsff->report->field[0]->value[2] = 0x00;
103 emsff->report->field[0]->value[3] = 0x00;
104 emsff->report->field[0]->value[4] = 0x00;
105 emsff->report->field[0]->value[5] = 0x00;
106 emsff->report->field[0]->value[6] = 0x00;
107 usbhid_submit_report(hid, emsff->report, USB_DIR_OUT);
109 hid_info(hid, "force feedback for EMS based devices by Ignaz Forster <ignaz.forster@gmx.de>\n");
111 return 0;
114 static int ems_probe(struct hid_device *hdev, const struct hid_device_id *id)
116 int ret;
118 ret = hid_parse(hdev);
119 if (ret) {
120 hid_err(hdev, "parse failed\n");
121 goto err;
124 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
125 if (ret) {
126 hid_err(hdev, "hw start failed\n");
127 goto err;
130 ret = emsff_init(hdev);
131 if (ret) {
132 dev_err(&hdev->dev, "force feedback init failed\n");
133 hid_hw_stop(hdev);
134 goto err;
137 return 0;
138 err:
139 return ret;
142 static const struct hid_device_id ems_devices[] = {
143 { HID_USB_DEVICE(USB_VENDOR_ID_EMS, 0x118) },
146 MODULE_DEVICE_TABLE(hid, ems_devices);
148 static struct hid_driver ems_driver = {
149 .name = "hkems",
150 .id_table = ems_devices,
151 .probe = ems_probe,
154 static int ems_init(void)
156 return hid_register_driver(&ems_driver);
159 static void ems_exit(void)
161 hid_unregister_driver(&ems_driver);
164 module_init(ems_init);
165 module_exit(ems_exit);
166 MODULE_LICENSE("GPL");