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5772f63613
Module hid-roccat-common contains functions used by roccat device driver modules to reduce code duplication. At the moment it contains just two wrapper methods for usb_control_msg that ensure that the buffer used for transfer is dma capable which wasn't the case before. The kconfig option is not visible to the user but will be selected by the device specific drivers. Signed-off-by: Stefan Achatz <erazor_de@users.sourceforge.net> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
/*
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* Roccat common functions for device specific drivers
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*
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* Copyright (c) 2011 Stefan Achatz <erazor_de@users.sourceforge.net>
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/slab.h>
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#include "hid-roccat-common.h"
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int roccat_common_receive(struct usb_device *usb_dev, uint usb_command,
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void *data, uint size)
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{
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char *buf;
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int len;
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buf = kmalloc(size, GFP_KERNEL);
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if (buf == NULL)
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return -ENOMEM;
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len = usb_control_msg(usb_dev, usb_rcvctrlpipe(usb_dev, 0),
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USB_REQ_CLEAR_FEATURE,
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USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
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usb_command, 0, buf, size, USB_CTRL_SET_TIMEOUT);
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memcpy(data, buf, size);
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kfree(buf);
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return ((len < 0) ? len : ((len != size) ? -EIO : 0));
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}
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EXPORT_SYMBOL_GPL(roccat_common_receive);
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int roccat_common_send(struct usb_device *usb_dev, uint usb_command,
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void const *data, uint size)
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{
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char *buf;
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int len;
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buf = kmalloc(size, GFP_KERNEL);
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if (buf == NULL)
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return -ENOMEM;
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memcpy(buf, data, size);
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len = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
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USB_REQ_SET_CONFIGURATION,
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USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
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usb_command, 0, buf, size, USB_CTRL_SET_TIMEOUT);
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kfree(buf);
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return ((len < 0) ? len : ((len != size) ? -EIO : 0));
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}
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EXPORT_SYMBOL_GPL(roccat_common_send);
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MODULE_AUTHOR("Stefan Achatz");
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MODULE_DESCRIPTION("USB Roccat common driver");
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MODULE_LICENSE("GPL v2");
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