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dvb-usb-firmware.c

/* dvb-usb-firmware.c is part of the DVB USB library.
 *
 * Copyright (C) 2004-6 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/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 = le16_to_cpu( *((u16 *) &b[1]) );
      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);

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