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/*
* 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, 5000);
}
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 the firmware file. (%s) "
"Please see linux/Documentation/dvb/ for more details on firmware-problems.",
dibdev->dev_cl->firmware);
return ret;
}
info("downloading firmware from file '%s'.",dibdev->dev_cl->firmware);
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;
}
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