/* dvb-usb-firmware.c is part of the DVB USB library. * * Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher@desy.de) * see dvb-usb-init.c for copyright information. * * This file contains functions for downloading the firmware to Cypress FX 1 and 2 based devices. * * FIXME: This part does actually not belong to dvb-usb, but to the usb-subsystem. */#include "dvb-usb-common.h"#include <linux/firmware.h>#include <linux/usb.h>struct usb_cypress_controller {	int id;	const char *name;       /* name of the usb controller */	u16 cpu_cs_register;    /* needs to be restarted, when the firmware has been downloaded. */};static struct usb_cypress_controller cypress[] = {	{ .id = CYPRESS_AN2135, .name = "Cypress AN2135", .cpu_cs_register = 0x7f92 },	{ .id = CYPRESS_AN2235, .name = "Cypress AN2235", .cpu_cs_register = 0x7f92 },	{ .id = CYPRESS_FX2,    .name = "Cypress FX2",    .cpu_cs_register = 0xe600 },};/* * load a firmware packet to the device */static int usb_cypress_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 usb_cypress_load_firmware(struct usb_device *udev, const char *filename, int type){	const struct firmware *fw = NULL;	u16 addr;	u8 *b,*p;	int ret = 0,i;	if ((ret = request_firmware(&fw, filename, &udev->dev)) != 0) {		err("did not find the firmware file. (%s) "			"Please see linux/Documentation/dvb/ for more details on firmware-problems.",			filename);		return ret;	}	info("downloading firmware from file '%s' to the '%s'",filename,cypress[type].name);	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 = usb_cypress_writemem(udev,cypress[type].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 = cpu_to_le16( *((u16 *) &b[1]) );			deb_fw("writing to address 0x%04x (buffer: 0x%02x%02x)\n",addr,b[1],b[2]);			ret = usb_cypress_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 || usb_cypress_writemem(udev,cypress[type].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;}