LXR linux/drivers/media/common/cypress

   1/*  cypress_firmware.c is part of the DVB USB library.
   2 *
   3 * Copyright (C) 2004-6 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
   7 * and 2 based devices.
   8 *
   9 */
  10
  11#include <linux/module.h>
  12#include <linux/slab.h>
  13#include <linux/usb.h>
  14#include <linux/firmware.h>
  15#include "cypress_firmware.h"
  16
  17struct usb_cypress_controller {
  18        u8 id;
  19        const char *name;       /* name of the usb controller */
  20        u16 cs_reg;             /* needs to be restarted,
  21                                 * when the firmware has been downloaded */
  22};
  23
  24static const struct usb_cypress_controller cypress[] = {
  25        { .id = CYPRESS_AN2135, .name = "Cypress AN2135", .cs_reg = 0x7f92 },
  26        { .id = CYPRESS_AN2235, .name = "Cypress AN2235", .cs_reg = 0x7f92 },
  27        { .id = CYPRESS_FX2,    .name = "Cypress FX2",    .cs_reg = 0xe600 },
  28};
  29
  30/*
  31 * load a firmware packet to the device
  32 */
  33static int usb_cypress_writemem(struct usb_device *udev, u16 addr, u8 *data,
  34                u8 len)
  35{
  36        return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  37                        0xa0, USB_TYPE_VENDOR, addr, 0x00, data, len, 5000);
  38}
  39
  40static int cypress_get_hexline(const struct firmware *fw,
  41                                struct hexline *hx, int *pos)
  42{
  43        u8 *b = (u8 *) &fw->data[*pos];
  44        int data_offs = 4;
  45
  46        if (*pos >= fw->size)
  47                return 0;
  48
  49        memset(hx, 0, sizeof(struct hexline));
  50        hx->len = b[0];
  51
  52        if ((*pos + hx->len + 4) >= fw->size)
  53                return -EINVAL;
  54
  55        hx->addr = b[1] | (b[2] << 8);
  56        hx->type = b[3];
  57
  58        if (hx->type == 0x04) {
  59                /* b[4] and b[5] are the Extended linear address record data
  60                 * field */
  61                hx->addr |= (b[4] << 24) | (b[5] << 16);
  62        }
  63
  64        memcpy(hx->data, &b[data_offs], hx->len);
  65        hx->chk = b[hx->len + data_offs];
  66        *pos += hx->len + 5;
  67
  68        return *pos;
  69}
  70
  71int cypress_load_firmware(struct usb_device *udev,
  72                const struct firmware *fw, int type)
  73{
  74        struct hexline *hx;
  75        int ret, pos = 0;
  76
  77        hx = kmalloc(sizeof(struct hexline), GFP_KERNEL);
  78        if (!hx) {
  79                dev_err(&udev->dev, "%s: kmalloc() failed\n", KBUILD_MODNAME);
  80                return -ENOMEM;
  81        }
  82
  83        /* stop the CPU */
  84        hx->data[0] = 1;
  85        ret = usb_cypress_writemem(udev, cypress[type].cs_reg, hx->data, 1);
  86        if (ret != 1) {
  87                dev_err(&udev->dev, "%s: CPU stop failed=%d\n",
  88                                KBUILD_MODNAME, ret);
  89                ret = -EIO;
  90                goto err_kfree;
  91        }
  92
  93        /* write firmware to memory */
  94        for (;;) {
  95                ret = cypress_get_hexline(fw, hx, &pos);
  96                if (ret < 0)
  97                        goto err_kfree;
  98                else if (ret == 0)
  99                        break;
 100
 101                ret = usb_cypress_writemem(udev, hx->addr, hx->data, hx->len);
 102                if (ret < 0) {
 103                        goto err_kfree;
 104                } else if (ret != hx->len) {
 105                        dev_err(&udev->dev,
 106                                        "%s: error while transferring firmware (transferred size=%d, block size=%d)\n",
 107                                        KBUILD_MODNAME, ret, hx->len);
 108                        ret = -EIO;
 109                        goto err_kfree;
 110                }
 111        }
 112
 113        /* start the CPU */
 114        hx->data[0] = 0;
 115        ret = usb_cypress_writemem(udev, cypress[type].cs_reg, hx->data, 1);
 116        if (ret != 1) {
 117                dev_err(&udev->dev, "%s: CPU start failed=%d\n",
 118                                KBUILD_MODNAME, ret);
 119                ret = -EIO;
 120                goto err_kfree;
 121        }
 122
 123        ret = 0;
 124err_kfree:
 125        kfree(hx);
 126        return ret;
 127}
 128EXPORT_SYMBOL(cypress_load_firmware);
 129
 130MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 131MODULE_DESCRIPTION("Cypress firmware download");
 132MODULE_LICENSE("GPL");
 133