drivers/media/dvb/dvb-usb/dvb-usb-firmware.c

   1 /* dvb-usb-firmware.c is part of the DVB USB library.
   2  *
   3  * Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher@desy.de)
   4  * see dvb-usb-init.c for copyright information.
   5  *
   6  * This file contains functions for downloading the firmware to Cypress FX 1 and 2 based devices.
   7  *
   8  * FIXME: This part does actually not belong to dvb-usb, but to the usb-subsystem.
   9  */
  10 #include "dvb-usb-common.h"
  11
  12 #include <linux/firmware.h>
  13 #include <linux/usb.h>
  14
  15 struct usb_cypress_controller {
  16         int id;
  17         const char *name;       /* name of the usb controller */
  18         u16 cpu_cs_register;    /* needs to be restarted, when the firmware has been downloaded. */
  19 };
  20
  21 static struct usb_cypress_controller cypress[] = {
  22         { .id = CYPRESS_AN2135, .name = "Cypress AN2135", .cpu_cs_register = 0x7f92 },
  23         { .id = CYPRESS_AN2235, .name = "Cypress AN2235", .cpu_cs_register = 0x7f92 },
  24         { .id = CYPRESS_FX2,    .name = "Cypress FX2",    .cpu_cs_register = 0xe600 },
  25 };
  26
  27 /*
  28  * load a firmware packet to the device
  29  */
  30 static int usb_cypress_writemem(struct usb_device *udev,u16 addr,u8 *data, u8 len)
  31 {
  32         return usb_control_msg(udev, usb_sndctrlpipe(udev,0),
  33                         0xa0, USB_TYPE_VENDOR, addr, 0x00, data, len, 5*HZ);
  34 }
  35
  36 int usb_cypress_load_firmware(struct usb_device *udev, const char *filename, int type)
  37 {
  38         const struct firmware *fw = NULL;
  39         u16 addr;
  40         u8 *b,*p;
  41         int ret = 0,i;
  42
  43         if ((ret = request_firmware(&fw, filename, &udev->dev)) != 0) {
  44                 err("did not find the firmware file. (%s) "
  45                         "Please see linux/Documentation/dvb/ for more details on firmware-problems.",
  46                         filename);
  47                 return ret;
  48         }
  49
  50         info("downloading firmware from file '%s' to the '%s'",filename,cypress[type].name);
  51
  52         p = kmalloc(fw->size,GFP_KERNEL);
  53         if (p != NULL) {
  54                 u8 reset;
  55                 /*
  56                  * you cannot use the fw->data as buffer for
  57                  * usb_control_msg, a new buffer has to be
  58                  * created
  59                  */
  60                 memcpy(p,fw->data,fw->size);
  61
  62                 /* stop the CPU */
  63                 reset = 1;
  64                 if ((ret = usb_cypress_writemem(udev,cypress[type].cpu_cs_register,&reset,1)) != 1)
  65                         err("could not stop the USB controller CPU.");
  66                 for(i = 0; p[i+3] == 0 && i < fw->size; ) {
  67                         b = (u8 *) &p[i];
  68                         addr = cpu_to_le16( *((u16 *) &b[1]) );
  69
  70                         deb_fw("writing to address 0x%04x (buffer: 0x%02x%02x)\n",addr,b[1],b[2]);
  71
  72                         ret = usb_cypress_writemem(udev,addr,&b[4],b[0]);
  73
  74                         if (ret != b[0]) {
  75                                 err("error while transferring firmware "
  76                                         "(transferred size: %d, block size: %d)",
  77                                         ret,b[0]);
  78                                 ret = -EINVAL;
  79                                 break;
  80                         }
  81                         i += 5 + b[0];
  82                 }
  83                 /* length in ret */
  84                 if (ret > 0)
  85                         ret = 0;
  86                 /* restart the CPU */
  87                 reset = 0;
  88                 if (ret || usb_cypress_writemem(udev,cypress[type].cpu_cs_register,&reset,1) != 1) {
  89                         err("could not restart the USB controller CPU.");
  90                         ret = -EINVAL;
  91                 }
  92
  93                 kfree(p);
  94         } else {
  95                 ret = -ENOMEM;
  96         }
  97         release_firmware(fw);
  98
  99         return ret;
 100 }