[SCSI] libsas: execute transport link resets with libata-eh via host workqueue
[linux-2.6.git] / drivers / hid / hid-emsff.c
1 /*
2  *  Force feedback support for EMS Trio Linker Plus II
3  *
4  *  Copyright (c) 2010 Ignaz Forster <ignaz.forster@gmx.de>
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 #include <linux/module.h>
28
29 #include "hid-ids.h"
30 #include "usbhid/usbhid.h"
31
32 struct emsff_device {
33         struct hid_report *report;
34 };
35
36 static int emsff_play(struct input_dev *dev, void *data,
37                          struct ff_effect *effect)
38 {
39         struct hid_device *hid = input_get_drvdata(dev);
40         struct emsff_device *emsff = data;
41         int weak, strong;
42
43         weak = effect->u.rumble.weak_magnitude;
44         strong = effect->u.rumble.strong_magnitude;
45
46         dbg_hid("called with 0x%04x 0x%04x\n", strong, weak);
47
48         weak = weak * 0xff / 0xffff;
49         strong = strong * 0xff / 0xffff;
50
51         emsff->report->field[0]->value[1] = weak;
52         emsff->report->field[0]->value[2] = strong;
53
54         dbg_hid("running with 0x%02x 0x%02x\n", strong, weak);
55         usbhid_submit_report(hid, emsff->report, USB_DIR_OUT);
56
57         return 0;
58 }
59
60 static int emsff_init(struct hid_device *hid)
61 {
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;
70
71         if (list_empty(report_list)) {
72                 hid_err(hid, "no output reports found\n");
73                 return -ENODEV;
74         }
75
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;
80         }
81
82         if (report->field[0]->report_count < 7) {
83                 hid_err(hid, "not enough values in the field\n");
84                 return -ENODEV;
85         }
86
87         emsff = kzalloc(sizeof(struct emsff_device), GFP_KERNEL);
88         if (!emsff)
89                 return -ENOMEM;
90
91         set_bit(FF_RUMBLE, dev->ffbit);
92
93         error = input_ff_create_memless(dev, emsff, emsff_play);
94         if (error) {
95                 kfree(emsff);
96                 return error;
97         }
98
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);
108
109         hid_info(hid, "force feedback for EMS based devices by Ignaz Forster <ignaz.forster@gmx.de>\n");
110
111         return 0;
112 }
113
114 static int ems_probe(struct hid_device *hdev, const struct hid_device_id *id)
115 {
116         int ret;
117
118         ret = hid_parse(hdev);
119         if (ret) {
120                 hid_err(hdev, "parse failed\n");
121                 goto err;
122         }
123
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;
128         }
129
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;
135         }
136
137         return 0;
138 err:
139         return ret;
140 }
141
142 static const struct hid_device_id ems_devices[] = {
143         { HID_USB_DEVICE(USB_VENDOR_ID_EMS, USB_DEVICE_ID_EMS_TRIO_LINKER_PLUS_II) },
144         { }
145 };
146 MODULE_DEVICE_TABLE(hid, ems_devices);
147
148 static struct hid_driver ems_driver = {
149         .name = "hkems",
150         .id_table = ems_devices,
151         .probe = ems_probe,
152 };
153
154 static int ems_init(void)
155 {
156         return hid_register_driver(&ems_driver);
157 }
158
159 static void ems_exit(void)
160 {
161         hid_unregister_driver(&ems_driver);
162 }
163
164 module_init(ems_init);
165 module_exit(ems_exit);
166 MODULE_LICENSE("GPL");
167