cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dvb-usb-firmware.c (4158B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* dvb-usb-firmware.c is part of the DVB USB library.
      3 *
      4 * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@posteo.de)
      5 * see dvb-usb-init.c for copyright information.
      6 *
      7 * This file contains functions for downloading the firmware to Cypress FX 1 and 2 based devices.
      8 *
      9 * FIXME: This part does actually not belong to dvb-usb, but to the usb-subsystem.
     10 */
     11#include "dvb-usb-common.h"
     12
     13#include <linux/usb.h>
     14
     15struct 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
     21static struct usb_cypress_controller cypress[] = {
     22	{ .id = DEVICE_SPECIFIC, .name = "Device specific", .cpu_cs_register = 0 },
     23	{ .id = CYPRESS_AN2135,  .name = "Cypress AN2135",  .cpu_cs_register = 0x7f92 },
     24	{ .id = CYPRESS_AN2235,  .name = "Cypress AN2235",  .cpu_cs_register = 0x7f92 },
     25	{ .id = CYPRESS_FX2,     .name = "Cypress FX2",     .cpu_cs_register = 0xe600 },
     26};
     27
     28/*
     29 * load a firmware packet to the device
     30 */
     31static int usb_cypress_writemem(struct usb_device *udev,u16 addr,u8 *data, u8 len)
     32{
     33	return usb_control_msg(udev, usb_sndctrlpipe(udev,0),
     34			0xa0, USB_TYPE_VENDOR, addr, 0x00, data, len, 5000);
     35}
     36
     37int usb_cypress_load_firmware(struct usb_device *udev, const struct firmware *fw, int type)
     38{
     39	struct hexline *hx;
     40	u8 *buf;
     41	int ret, pos = 0;
     42	u16 cpu_cs_register = cypress[type].cpu_cs_register;
     43
     44	buf = kmalloc(sizeof(*hx), GFP_KERNEL);
     45	if (!buf)
     46		return -ENOMEM;
     47	hx = (struct hexline *)buf;
     48
     49	/* stop the CPU */
     50	buf[0] = 1;
     51	if (usb_cypress_writemem(udev, cpu_cs_register, buf, 1) != 1)
     52		err("could not stop the USB controller CPU.");
     53
     54	while ((ret = dvb_usb_get_hexline(fw, hx, &pos)) > 0) {
     55		deb_fw("writing to address 0x%04x (buffer: 0x%02x %02x)\n", hx->addr, hx->len, hx->chk);
     56		ret = usb_cypress_writemem(udev, hx->addr, hx->data, hx->len);
     57
     58		if (ret != hx->len) {
     59			err("error while transferring firmware (transferred size: %d, block size: %d)",
     60				ret, hx->len);
     61			ret = -EINVAL;
     62			break;
     63		}
     64	}
     65	if (ret < 0) {
     66		err("firmware download failed at %d with %d",pos,ret);
     67		kfree(buf);
     68		return ret;
     69	}
     70
     71	if (ret == 0) {
     72		/* restart the CPU */
     73		buf[0] = 0;
     74		if (usb_cypress_writemem(udev, cpu_cs_register, buf, 1) != 1) {
     75			err("could not restart the USB controller CPU.");
     76			ret = -EINVAL;
     77		}
     78	} else
     79		ret = -EIO;
     80
     81	kfree(buf);
     82
     83	return ret;
     84}
     85EXPORT_SYMBOL(usb_cypress_load_firmware);
     86
     87int dvb_usb_download_firmware(struct usb_device *udev,
     88			      const struct dvb_usb_device_properties *props)
     89{
     90	int ret;
     91	const struct firmware *fw = NULL;
     92
     93	if ((ret = request_firmware(&fw, props->firmware, &udev->dev)) != 0) {
     94		err("did not find the firmware file '%s' (status %d). You can use <kernel_dir>/scripts/get_dvb_firmware to get the firmware",
     95			props->firmware,ret);
     96		return ret;
     97	}
     98
     99	info("downloading firmware from file '%s'",props->firmware);
    100
    101	switch (props->usb_ctrl) {
    102		case CYPRESS_AN2135:
    103		case CYPRESS_AN2235:
    104		case CYPRESS_FX2:
    105			ret = usb_cypress_load_firmware(udev, fw, props->usb_ctrl);
    106			break;
    107		case DEVICE_SPECIFIC:
    108			if (props->download_firmware)
    109				ret = props->download_firmware(udev,fw);
    110			else {
    111				err("BUG: driver didn't specified a download_firmware-callback, although it claims to have a DEVICE_SPECIFIC one.");
    112				ret = -EINVAL;
    113			}
    114			break;
    115		default:
    116			ret = -EINVAL;
    117			break;
    118	}
    119
    120	release_firmware(fw);
    121	return ret;
    122}
    123
    124int dvb_usb_get_hexline(const struct firmware *fw, struct hexline *hx,
    125			       int *pos)
    126{
    127	u8 *b = (u8 *) &fw->data[*pos];
    128	int data_offs = 4;
    129	if (*pos >= fw->size)
    130		return 0;
    131
    132	memset(hx,0,sizeof(struct hexline));
    133
    134	hx->len  = b[0];
    135
    136	if ((*pos + hx->len + 4) >= fw->size)
    137		return -EINVAL;
    138
    139	hx->addr = b[1] | (b[2] << 8);
    140	hx->type = b[3];
    141
    142	if (hx->type == 0x04) {
    143		/* b[4] and b[5] are the Extended linear address record data field */
    144		hx->addr |= (b[4] << 24) | (b[5] << 16);
    145/*		hx->len -= 2;
    146		data_offs += 2; */
    147	}
    148	memcpy(hx->data,&b[data_offs],hx->len);
    149	hx->chk = b[hx->len + data_offs];
    150
    151	*pos += hx->len + 5;
    152
    153	return *pos;
    154}
    155EXPORT_SYMBOL(dvb_usb_get_hexline);