/* * dvb-dibusb-firmware.c is part of the driver for mobile USB Budget DVB-T devices  * based on reference design made by DiBcom (http://www.dibcom.fr/) * * Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher@desy.de) * * see dvb-dibusb-core.c for more copyright details. * * This file contains functions for downloading the firmware to the device. */#include "dvb-dibusb.h"#include <linux/firmware.h>#include <linux/usb.h>/* * load a firmware packet to the device  */static int dibusb_writemem(struct usb_device *udev,u16 addr,u8 *data, u8 len){	return usb_control_msg(udev, usb_sndctrlpipe(udev,0),			0xa0, USB_TYPE_VENDOR, addr, 0x00, data, len, 5*HZ);}int dibusb_loadfirmware(struct usb_device *udev, struct dibusb_usb_device *dibdev){	const struct firmware *fw = NULL;	u16 addr;	u8 *b,*p;	int ret = 0,i;		if ((ret = request_firmware(&fw, dibdev->dev_cl->firmware, &udev->dev)) != 0) {		err("did not find a valid firmware file. (%s) "			"Please see linux/Documentation/dvb/ for more details on firmware-problems.",			dibdev->dev_cl->firmware);		return ret;	}		p = kmalloc(fw->size,GFP_KERNEL);		if (p != NULL) {		u8 reset;		/*		 * you cannot use the fw->data as buffer for 		 * usb_control_msg, a new buffer has to be		 * created		 */		memcpy(p,fw->data,fw->size);		/* stop the CPU */		reset = 1;		if ((ret = dibusb_writemem(udev,dibdev->dev_cl->usb_ctrl->cpu_cs_register,&reset,1)) != 1) 			err("could not stop the USB controller CPU.");		for(i = 0; p[i+3] == 0 && i < fw->size; ) { 			b = (u8 *) &p[i];			addr = *((u16 *) &b[1]);			ret = dibusb_writemem(udev,addr,&b[4],b[0]);					if (ret != b[0]) {				err("error while transferring firmware "					"(transferred size: %d, block size: %d)",					ret,b[0]);				ret = -EINVAL;				break;			}			i += 5 + b[0];		}		/* length in ret */		if (ret > 0)			ret = 0;		/* restart the CPU */		reset = 0;		if (ret || dibusb_writemem(udev,dibdev->dev_cl->usb_ctrl->cpu_cs_register,&reset,1) != 1) {			err("could not restart the USB controller CPU.");			ret = -EINVAL;		}		kfree(p);	} else { 		ret = -ENOMEM;	}	release_firmware(fw);	return ret;}