cap_syslog: accept CAP_SYS_ADMIN for now
[wandboard.git] / drivers / hid / hid-zpff.c
blobf31fab012f2f24732aa7934cc732b9e7b7cffb64
1 /*
2 * Force feedback support for Zeroplus based devices
4 * Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com>
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/slab.h>
27 #include <linux/usb.h>
29 #include "hid-ids.h"
31 #ifdef CONFIG_ZEROPLUS_FF
32 #include "usbhid/usbhid.h"
34 struct zpff_device {
35 struct hid_report *report;
38 static int zpff_play(struct input_dev *dev, void *data,
39 struct ff_effect *effect)
41 struct hid_device *hid = input_get_drvdata(dev);
42 struct zpff_device *zpff = data;
43 int left, right;
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
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);
55 left = left * 0x7f / 0xffff;
56 right = right * 0x7f / 0xffff;
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);
63 return 0;
66 static int zpff_init(struct hid_device *hid)
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;
77 if (list_empty(report_list)) {
78 hid_err(hid, "no output report found\n");
79 return -ENODEV;
82 report = list_entry(report_list->next, struct hid_report, list);
84 if (report->maxfield < 4) {
85 hid_err(hid, "not enough fields in report\n");
86 return -ENODEV;
89 zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
90 if (!zpff)
91 return -ENOMEM;
93 set_bit(FF_RUMBLE, dev->ffbit);
95 error = input_ff_create_memless(dev, zpff, zpff_play);
96 if (error) {
97 kfree(zpff);
98 return error;
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);
108 hid_info(hid, "force feedback for Zeroplus based devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
110 return 0;
112 #else
113 static inline int zpff_init(struct hid_device *hid)
115 return 0;
117 #endif
119 static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)
121 int ret;
123 ret = hid_parse(hdev);
124 if (ret) {
125 hid_err(hdev, "parse failed\n");
126 goto err;
129 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
130 if (ret) {
131 hid_err(hdev, "hw start failed\n");
132 goto err;
135 zpff_init(hdev);
137 return 0;
138 err:
139 return ret;
142 static const struct hid_device_id zp_devices[] = {
143 { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
144 { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
147 MODULE_DEVICE_TABLE(hid, zp_devices);
149 static struct hid_driver zp_driver = {
150 .name = "zeroplus",
151 .id_table = zp_devices,
152 .probe = zp_probe,
155 static int __init zp_init(void)
157 return hid_register_driver(&zp_driver);
160 static void __exit zp_exit(void)
162 hid_unregister_driver(&zp_driver);
165 module_init(zp_init);
166 module_exit(zp_exit);
167 MODULE_LICENSE("GPL");