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

   1 /* dvb-usb-firmware.c is part of the DVB USB library.
   2  *
   3  * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@posteo.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/usb.h>
  13
  14 struct usb_cypress_controller {
  15         int id;
  16         const char *name;       /* name of the usb controller */
  17         u16 cpu_cs_register;    /* needs to be restarted, when the firmware has been downloaded. */
  18 };
  19
  20 static struct usb_cypress_controller cypress[] = {
  21         { .id = DEVICE_SPECIFIC, .name = "Device specific", .cpu_cs_register = 0 },
  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, 5000);
  34 }
  35
  36 int usb_cypress_load_firmware(struct usb_device *udev, const struct firmware *fw, int type)
  37 {
  38         struct hexline hx;
  39         u8 reset;
  40         int ret,pos=0;
  41
  42         /* stop the CPU */
  43         reset = 1;
  44         if ((ret = usb_cypress_writemem(udev,cypress[type].cpu_cs_register,&reset,1)) != 1)
  45                 err("could not stop the USB controller CPU.");
  46
  47         while ((ret = dvb_usb_get_hexline(fw,&hx,&pos)) > 0) {
  48                 deb_fw("writing to address 0x%04x (buffer: 0x%02x %02x)\n",hx.addr,hx.len,hx.chk);
  49                 ret = usb_cypress_writemem(udev,hx.addr,hx.data,hx.len);
  50
  51                 if (ret != hx.len) {
  52                         err("error while transferring firmware (transferred size: %d, block size: %d)",
  53                                 ret,hx.len);
  54                         ret = -EINVAL;
  55                         break;
  56                 }
  57         }
  58         if (ret < 0) {
  59                 err("firmware download failed at %d with %d",pos,ret);
  60                 return ret;
  61         }
  62
  63         if (ret == 0) {
  64                 /* restart the CPU */
  65                 reset = 0;
  66                 if (ret || usb_cypress_writemem(udev,cypress[type].cpu_cs_register,&reset,1) != 1) {
  67                         err("could not restart the USB controller CPU.");
  68                         ret = -EINVAL;
  69                 }
  70         } else
  71                 ret = -EIO;
  72
  73         return ret;
  74 }
  75 EXPORT_SYMBOL(usb_cypress_load_firmware);
  76
  77 int dvb_usb_download_firmware(struct usb_device *udev, struct dvb_usb_device_properties *props)
  78 {
  79         int ret;
  80         const struct firmware *fw = NULL;
  81
  82         if ((ret = request_firmware(&fw, props->firmware, &udev->dev)) != 0) {
  83                 err("did not find the firmware file. (%s) Please see linux/Documentation/dvb/ for more details on firmware-problems. (%d)",
  84                         props->firmware,ret);
  85                 return ret;
  86         }
  87
  88         info("downloading firmware from file '%s'",props->firmware);
  89
  90         switch (props->usb_ctrl) {
  91                 case CYPRESS_AN2135:
  92                 case CYPRESS_AN2235:
  93                 case CYPRESS_FX2:
  94                         ret = usb_cypress_load_firmware(udev, fw, props->usb_ctrl);
  95                         break;
  96                 case DEVICE_SPECIFIC:
  97                         if (props->download_firmware)
  98                                 ret = props->download_firmware(udev,fw);
  99                         else {
 100                                 err("BUG: driver didn't specified a download_firmware-callback, although it claims to have a DEVICE_SPECIFIC one.");
 101                                 ret = -EINVAL;
 102                         }
 103                         break;
 104                 default:
 105                         ret = -EINVAL;
 106                         break;
 107         }
 108
 109         release_firmware(fw);
 110         return ret;
 111 }
 112
 113 int dvb_usb_get_hexline(const struct firmware *fw, struct hexline *hx,
 114                                int *pos)
 115 {
 116         u8 *b = (u8 *) &fw->data[*pos];
 117         int data_offs = 4;
 118         if (*pos >= fw->size)
 119                 return 0;
 120
 121         memset(hx,0,sizeof(struct hexline));
 122
 123         hx->len  = b[0];
 124
 125         if ((*pos + hx->len + 4) >= fw->size)
 126                 return -EINVAL;
 127
 128         hx->addr = b[1] | (b[2] << 8);
 129         hx->type = b[3];
 130
 131         if (hx->type == 0x04) {
 132                 /* b[4] and b[5] are the Extended linear address record data field */
 133                 hx->addr |= (b[4] << 24) | (b[5] << 16);
 134 /*              hx->len -= 2;
 135                 data_offs += 2; */
 136         }
 137         memcpy(hx->data,&b[data_offs],hx->len);
 138         hx->chk = b[hx->len + data_offs];
 139
 140         *pos += hx->len + 5;
 141
 142         return *pos;
 143 }
 144 EXPORT_SYMBOL(dvb_usb_get_hexline);