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/*
* Roccat common functions for device specific drivers
*
* Copyright (c) 2011 Stefan Achatz <erazor_de@users.sourceforge.net>
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*/
#include <linux/hid.h>
#include <linux/slab.h>
#include <linux/module.h>
#include "hid-roccat-common.h"
static inline uint16_t roccat_common_feature_report(uint8_t report_id)
{
return 0x300 | report_id;
}
int roccat_common_receive(struct usb_device *usb_dev, uint report_id,
void *data, uint size)
{
char *buf;
int len;
buf = kmalloc(size, GFP_KERNEL);
if (buf == NULL)
return -ENOMEM;
len = usb_control_msg(usb_dev, usb_rcvctrlpipe(usb_dev, 0),
HID_REQ_GET_REPORT,
USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
roccat_common_feature_report(report_id),
0, buf, size, USB_CTRL_SET_TIMEOUT);
memcpy(data, buf, size);
kfree(buf);
return ((len < 0) ? len : ((len != size) ? -EIO : 0));
}
EXPORT_SYMBOL_GPL(roccat_common_receive);
int roccat_common_send(struct usb_device *usb_dev, uint report_id,
void const *data, uint size)
{
char *buf;
int len;
buf = kmemdup(data, size, GFP_KERNEL);
if (buf == NULL)
return -ENOMEM;
len = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
HID_REQ_SET_REPORT,
USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
roccat_common_feature_report(report_id),
0, buf, size, USB_CTRL_SET_TIMEOUT);
kfree(buf);
return ((len < 0) ? len : ((len != size) ? -EIO : 0));
}
EXPORT_SYMBOL_GPL(roccat_common_send);
enum roccat_common_control_states {
ROCCAT_COMMON_CONTROL_STATUS_OVERLOAD = 0,
ROCCAT_COMMON_CONTROL_STATUS_OK = 1,
ROCCAT_COMMON_CONTROL_STATUS_INVALID = 2,
ROCCAT_COMMON_CONTROL_STATUS_WAIT = 3,
};
static int roccat_common_receive_control_status(struct usb_device *usb_dev)
{
int retval;
struct roccat_common_control control;
do {
msleep(50);
retval = roccat_common_receive(usb_dev,
ROCCAT_COMMON_COMMAND_CONTROL,
&control, sizeof(struct roccat_common_control));
if (retval)
return retval;
switch (control.value) {
case ROCCAT_COMMON_CONTROL_STATUS_OK:
return 0;
case ROCCAT_COMMON_CONTROL_STATUS_WAIT:
msleep(500);
continue;
case ROCCAT_COMMON_CONTROL_STATUS_INVALID:
case ROCCAT_COMMON_CONTROL_STATUS_OVERLOAD:
/* seems to be critical - replug necessary */
return -EINVAL;
default:
dev_err(&usb_dev->dev,
"roccat_common_receive_control_status: "
"unknown response value 0x%x\n",
control.value);
return -EINVAL;
}
} while (1);
}
int roccat_common_send_with_status(struct usb_device *usb_dev,
uint command, void const *buf, uint size)
{
int retval;
retval = roccat_common_send(usb_dev, command, buf, size);
if (retval)
return retval;
msleep(100);
return roccat_common_receive_control_status(usb_dev);
}
EXPORT_SYMBOL_GPL(roccat_common_send_with_status);
MODULE_AUTHOR("Stefan Achatz");
MODULE_DESCRIPTION("USB Roccat common driver");
MODULE_LICENSE("GPL v2");
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