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 *buf;
  40         int ret, pos = 0;
  41         u16 cpu_cs_register = cypress[type].cpu_cs_register;
  42
  43         buf = kmalloc(sizeof(*hx), GFP_KERNEL);
  44         if (!buf)
  45                 return -ENOMEM;
  46         hx = (struct hexline *)buf;
  47
  48         /* stop the CPU */
  49         buf[0] = 1;
  50         if (usb_cypress_writemem(udev, cpu_cs_register, buf, 1) != 1)
  51                 err("could not stop the USB controller CPU.");
  52
  53         while ((ret = dvb_usb_get_hexline(fw, hx, &pos)) > 0) {
  54                 deb_fw("writing to address 0x%04x (buffer: 0x%02x %02x)\n", hx->addr, hx->len, hx->chk);
  55                 ret = usb_cypress_writemem(udev, hx->addr, hx->data, hx->len);
  56
  57                 if (ret != hx->len) {
  58                         err("error while transferring firmware (transferred size: %d, block size: %d)",
  59                                 ret, hx->len);
  60                         ret = -EINVAL;
  61                         break;
  62                 }
  63         }
  64         if (ret < 0) {
  65                 err("firmware download failed at %d with %d",pos,ret);
  66                 kfree(buf);
  67                 return ret;
  68         }
  69
  70         if (ret == 0) {
  71                 /* restart the CPU */
  72                 buf[0] = 0;
  73                 if (usb_cypress_writemem(udev, cpu_cs_register, buf, 1) != 1) {
  74                         err("could not restart the USB controller CPU.");
  75                         ret = -EINVAL;
  76                 }
  77         } else
  78                 ret = -EIO;
  79
  80         kfree(buf);
  81
  82         return ret;
  83 }
  84 EXPORT_SYMBOL(usb_cypress_load_firmware);
  85
  86 int dvb_usb_download_firmware(struct usb_device *udev, struct dvb_usb_device_properties *props)
  87 {
  88         int ret;
  89         const struct firmware *fw = NULL;
  90
  91         if ((ret = request_firmware(&fw, props->firmware, &udev->dev)) != 0) {
  92                 err("did not find the firmware file. (%s) Please see linux/Documentation/dvb/ for more details on firmware-problems. (%d)",
  93                         props->firmware,ret);
  94                 return ret;
  95         }
  96
  97         info("downloading firmware from file '%s'",props->firmware);
  98
  99         switch (props->usb_ctrl) {
 100                 case CYPRESS_AN2135:
 101                 case CYPRESS_AN2235:
 102                 case CYPRESS_FX2:
 103                         ret = usb_cypress_load_firmware(udev, fw, props->usb_ctrl);
 104                         break;
 105                 case DEVICE_SPECIFIC:
 106                         if (props->download_firmware)
 107                                 ret = props->download_firmware(udev,fw);
 108                         else {
 109                                 err("BUG: driver didn't specified a download_firmware-callback, although it claims to have a DEVICE_SPECIFIC one.");
 110                                 ret = -EINVAL;
 111                         }
 112                         break;
 113                 default:
 114                         ret = -EINVAL;
 115                         break;
 116         }
 117
 118         release_firmware(fw);
 119         return ret;
 120 }
 121
 122 int dvb_usb_get_hexline(const struct firmware *fw, struct hexline *hx,
 123                                int *pos)
 124 {
 125         u8 *b = (u8 *) &fw->data[*pos];
 126         int data_offs = 4;
 127         if (*pos >= fw->size)
 128                 return 0;
 129
 130         memset(hx,0,sizeof(struct hexline));
 131
 132         hx->len  = b[0];
 133
 134         if ((*pos + hx->len + 4) >= fw->size)
 135                 return -EINVAL;
 136
 137         hx->addr = b[1] | (b[2] << 8);
 138         hx->type = b[3];
 139
 140         if (hx->type == 0x04) {
 141                 /* b[4] and b[5] are the Extended linear address record data field */
 142                 hx->addr |= (b[4] << 24) | (b[5] << 16);
 143 /*              hx->len -= 2;
 144                 data_offs += 2; */
 145         }
 146         memcpy(hx->data,&b[data_offs],hx->len);
 147         hx->chk = b[hx->len + data_offs];
 148
 149         *pos += hx->len + 5;
 150
 151         return *pos;
 152 }
 153 EXPORT_SYMBOL(dvb_usb_get_hexline);