text: 
  #include "dvb-usb-common.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 = DEVICE_SPECIFIC, .name = "Device specific", .cpu_cs_register = 0 },
  	{ .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, 5000);
  }
  
  int usb_cypress_load_firmware(struct usb_device *udev, const struct firmware *fw, int type)
  {
  	struct hexline hx;
  	u8 reset;
  	int ret,pos=0;
  
  	/* 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.");
  
  	while ((ret = dvb_usb_get_hexline(fw,&hx,&pos)) > 0) {
  		deb_fw("writing to address 0x%04x (buffer: 0x%02x %02x)\n",hx.addr,hx.len,hx.chk);
  		ret = usb_cypress_writemem(udev,hx.addr,hx.data,hx.len);
  
  		if (ret != hx.len) {
  			err("error while transferring firmware "
  				"(transferred size: %d, block size: %d)",
  				ret,hx.len);
  			ret = -EINVAL;
  			break;
  		}
  	}
  	if (ret < 0) {
  		err("firmware download failed at %d with %d",pos,ret);
  		return ret;
  	}
  
  	if (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;
  		}
  	} else
  		ret = -EIO;
  
  	return ret;
  }
  EXPORT_SYMBOL(usb_cypress_load_firmware);
  
  int dvb_usb_download_firmware(struct usb_device *udev, struct dvb_usb_device_properties *props)
  {
  	int ret;
  	const struct firmware *fw = NULL;
  
  	if ((ret = request_firmware(&fw, props->firmware, &udev->dev)) != 0) {
  		err("did not find the firmware file. (%s) "
  			"Please see linux/Documentation/dvb/ for more details on firmware-problems. (%d)",
  			props->firmware,ret);
  		return ret;
  	}
  
  	info("downloading firmware from file '%s'",props->firmware);
  
  	switch (props->usb_ctrl) {
  		case CYPRESS_AN2135:
  		case CYPRESS_AN2235:
  		case CYPRESS_FX2:
  			ret = usb_cypress_load_firmware(udev, fw, props->usb_ctrl);
  			break;
  		case DEVICE_SPECIFIC:
  			if (props->download_firmware)
  				ret = props->download_firmware(udev,fw);
  			else {
  				err("BUG: driver didn't specified a download_firmware-callback, although it claims to have a DEVICE_SPECIFIC one.");
  				ret = -EINVAL;
  			}
  			break;
  		default:
  			ret = -EINVAL;
  			break;
  	}
  
  	release_firmware(fw);
  	return ret;
  }
  
  int dvb_usb_get_hexline(const struct firmware *fw, struct hexline *hx,
  			       int *pos)
  {
  	u8 *b = (u8 *) &fw->data[*pos];
  	int data_offs = 4;
  	if (*pos >= fw->size)
  		return 0;
  
  	memset(hx,0,sizeof(struct hexline));
  
  	hx->len  = b[0];
  
  	if ((*pos + hx->len + 4) >= fw->size)
  		return -EINVAL;
  
  	hx->addr = b[1] | (b[2] << 8);
  	hx->type = b[3];
  
  	if (hx->type == 0x04) {
  		/* b[4] and b[5] are the Extended linear address record data field */
  		hx->addr |= (b[4] << 24) | (b[5] << 16);
  /*		hx->len -= 2;
  		data_offs += 2; */
  	}
  	memcpy(hx->data,&b[data_offs],hx->len);
  	hx->chk = b[hx->len + data_offs];
  
  	*pos += hx->len + 5;
  
  	return *pos;
  }
  EXPORT_SYMBOL(dvb_usb_get_hexline);
  