Merge branch 'kvm-ppc-next' of git://github.com/agraf/linux-2.6 into kvm-queue
[linux-2.6-microblaze.git] / drivers / hid / hid-roccat-common.c
1 /*
2  * Roccat common functions for device specific drivers
3  *
4  * Copyright (c) 2011 Stefan Achatz <erazor_de@users.sourceforge.net>
5  */
6
7 /*
8  * This program is free software; you can redistribute it and/or modify it
9  * under the terms of the GNU General Public License as published by the Free
10  * Software Foundation; either version 2 of the License, or (at your option)
11  * any later version.
12  */
13
14 #include <linux/hid.h>
15 #include <linux/slab.h>
16 #include <linux/module.h>
17 #include "hid-roccat-common.h"
18
19 static inline uint16_t roccat_common2_feature_report(uint8_t report_id)
20 {
21         return 0x300 | report_id;
22 }
23
24 int roccat_common2_receive(struct usb_device *usb_dev, uint report_id,
25                 void *data, uint size)
26 {
27         char *buf;
28         int len;
29
30         buf = kmalloc(size, GFP_KERNEL);
31         if (buf == NULL)
32                 return -ENOMEM;
33
34         len = usb_control_msg(usb_dev, usb_rcvctrlpipe(usb_dev, 0),
35                         HID_REQ_GET_REPORT,
36                         USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
37                         roccat_common2_feature_report(report_id),
38                         0, buf, size, USB_CTRL_SET_TIMEOUT);
39
40         memcpy(data, buf, size);
41         kfree(buf);
42         return ((len < 0) ? len : ((len != size) ? -EIO : 0));
43 }
44 EXPORT_SYMBOL_GPL(roccat_common2_receive);
45
46 int roccat_common2_send(struct usb_device *usb_dev, uint report_id,
47                 void const *data, uint size)
48 {
49         char *buf;
50         int len;
51
52         buf = kmemdup(data, size, GFP_KERNEL);
53         if (buf == NULL)
54                 return -ENOMEM;
55
56         len = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
57                         HID_REQ_SET_REPORT,
58                         USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
59                         roccat_common2_feature_report(report_id),
60                         0, buf, size, USB_CTRL_SET_TIMEOUT);
61
62         kfree(buf);
63         return ((len < 0) ? len : ((len != size) ? -EIO : 0));
64 }
65 EXPORT_SYMBOL_GPL(roccat_common2_send);
66
67 enum roccat_common2_control_states {
68         ROCCAT_COMMON_CONTROL_STATUS_CRITICAL = 0,
69         ROCCAT_COMMON_CONTROL_STATUS_OK = 1,
70         ROCCAT_COMMON_CONTROL_STATUS_INVALID = 2,
71         ROCCAT_COMMON_CONTROL_STATUS_BUSY = 3,
72         ROCCAT_COMMON_CONTROL_STATUS_CRITICAL_NEW = 4,
73 };
74
75 static int roccat_common2_receive_control_status(struct usb_device *usb_dev)
76 {
77         int retval;
78         struct roccat_common2_control control;
79
80         do {
81                 msleep(50);
82                 retval = roccat_common2_receive(usb_dev,
83                                 ROCCAT_COMMON_COMMAND_CONTROL,
84                                 &control, sizeof(struct roccat_common2_control));
85
86                 if (retval)
87                         return retval;
88
89                 switch (control.value) {
90                 case ROCCAT_COMMON_CONTROL_STATUS_OK:
91                         return 0;
92                 case ROCCAT_COMMON_CONTROL_STATUS_BUSY:
93                         msleep(500);
94                         continue;
95                 case ROCCAT_COMMON_CONTROL_STATUS_INVALID:
96                 case ROCCAT_COMMON_CONTROL_STATUS_CRITICAL:
97                 case ROCCAT_COMMON_CONTROL_STATUS_CRITICAL_NEW:
98                         return -EINVAL;
99                 default:
100                         dev_err(&usb_dev->dev,
101                                         "roccat_common2_receive_control_status: "
102                                         "unknown response value 0x%x\n",
103                                         control.value);
104                         return -EINVAL;
105                 }
106
107         } while (1);
108 }
109
110 int roccat_common2_send_with_status(struct usb_device *usb_dev,
111                 uint command, void const *buf, uint size)
112 {
113         int retval;
114
115         retval = roccat_common2_send(usb_dev, command, buf, size);
116         if (retval)
117                 return retval;
118
119         msleep(100);
120
121         return roccat_common2_receive_control_status(usb_dev);
122 }
123 EXPORT_SYMBOL_GPL(roccat_common2_send_with_status);
124
125 int roccat_common2_device_init_struct(struct usb_device *usb_dev,
126                 struct roccat_common2_device *dev)
127 {
128         mutex_init(&dev->lock);
129         return 0;
130 }
131 EXPORT_SYMBOL_GPL(roccat_common2_device_init_struct);
132
133 ssize_t roccat_common2_sysfs_read(struct file *fp, struct kobject *kobj,
134                 char *buf, loff_t off, size_t count,
135                 size_t real_size, uint command)
136 {
137         struct device *dev =
138                         container_of(kobj, struct device, kobj)->parent->parent;
139         struct roccat_common2_device *roccat_dev = hid_get_drvdata(dev_get_drvdata(dev));
140         struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
141         int retval;
142
143         if (off >= real_size)
144                 return 0;
145
146         if (off != 0 || count != real_size)
147                 return -EINVAL;
148
149         mutex_lock(&roccat_dev->lock);
150         retval = roccat_common2_receive(usb_dev, command, buf, real_size);
151         mutex_unlock(&roccat_dev->lock);
152
153         return retval ? retval : real_size;
154 }
155 EXPORT_SYMBOL_GPL(roccat_common2_sysfs_read);
156
157 ssize_t roccat_common2_sysfs_write(struct file *fp, struct kobject *kobj,
158                 void const *buf, loff_t off, size_t count,
159                 size_t real_size, uint command)
160 {
161         struct device *dev =
162                         container_of(kobj, struct device, kobj)->parent->parent;
163         struct roccat_common2_device *roccat_dev = hid_get_drvdata(dev_get_drvdata(dev));
164         struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
165         int retval;
166
167         if (off != 0 || count != real_size)
168                 return -EINVAL;
169
170         mutex_lock(&roccat_dev->lock);
171         retval = roccat_common2_send_with_status(usb_dev, command, buf, real_size);
172         mutex_unlock(&roccat_dev->lock);
173
174         return retval ? retval : real_size;
175 }
176 EXPORT_SYMBOL_GPL(roccat_common2_sysfs_write);
177
178 MODULE_AUTHOR("Stefan Achatz");
179 MODULE_DESCRIPTION("USB Roccat common driver");
180 MODULE_LICENSE("GPL v2");