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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pvrusb2-eeprom.c (3681B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 *
      4 *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
      5 *  Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
      6 */
      7
      8#include <linux/slab.h>
      9#include "pvrusb2-eeprom.h"
     10#include "pvrusb2-hdw-internal.h"
     11#include "pvrusb2-debug.h"
     12
     13#define trace_eeprom(...) pvr2_trace(PVR2_TRACE_EEPROM,__VA_ARGS__)
     14
     15
     16
     17/*
     18
     19   Read and analyze data in the eeprom.  Use tveeprom to figure out
     20   the packet structure, since this is another Hauppauge device and
     21   internally it has a family resemblance to ivtv-type devices
     22
     23*/
     24
     25#include <media/tveeprom.h>
     26
     27/* We seem to only be interested in the last 128 bytes of the EEPROM */
     28#define EEPROM_SIZE 128
     29
     30/* Grab EEPROM contents, needed for direct method. */
     31static u8 *pvr2_eeprom_fetch(struct pvr2_hdw *hdw)
     32{
     33	struct i2c_msg msg[2];
     34	u8 *eeprom;
     35	u8 iadd[2];
     36	u8 addr;
     37	u16 eepromSize;
     38	unsigned int offs;
     39	int ret;
     40	int mode16 = 0;
     41	unsigned pcnt,tcnt;
     42	eeprom = kzalloc(EEPROM_SIZE, GFP_KERNEL);
     43	if (!eeprom) {
     44		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
     45			   "Failed to allocate memory required to read eeprom");
     46		return NULL;
     47	}
     48
     49	trace_eeprom("Value for eeprom addr from controller was 0x%x",
     50		     hdw->eeprom_addr);
     51	addr = hdw->eeprom_addr;
     52	/* Seems that if the high bit is set, then the *real* eeprom
     53	   address is shifted right now bit position (noticed this in
     54	   newer PVR USB2 hardware) */
     55	if (addr & 0x80) addr >>= 1;
     56
     57	/* FX2 documentation states that a 16bit-addressed eeprom is
     58	   expected if the I2C address is an odd number (yeah, this is
     59	   strange but it's what they do) */
     60	mode16 = (addr & 1);
     61	eepromSize = (mode16 ? 4096 : 256);
     62	trace_eeprom("Examining %d byte eeprom at location 0x%x using %d bit addressing",
     63		     eepromSize, addr,
     64		     mode16 ? 16 : 8);
     65
     66	msg[0].addr = addr;
     67	msg[0].flags = 0;
     68	msg[0].len = mode16 ? 2 : 1;
     69	msg[0].buf = iadd;
     70	msg[1].addr = addr;
     71	msg[1].flags = I2C_M_RD;
     72
     73	/* We have to do the actual eeprom data fetch ourselves, because
     74	   (1) we're only fetching part of the eeprom, and (2) if we were
     75	   getting the whole thing our I2C driver can't grab it in one
     76	   pass - which is what tveeprom is otherwise going to attempt */
     77	for (tcnt = 0; tcnt < EEPROM_SIZE; tcnt += pcnt) {
     78		pcnt = 16;
     79		if (pcnt + tcnt > EEPROM_SIZE) pcnt = EEPROM_SIZE-tcnt;
     80		offs = tcnt + (eepromSize - EEPROM_SIZE);
     81		if (mode16) {
     82			iadd[0] = offs >> 8;
     83			iadd[1] = offs;
     84		} else {
     85			iadd[0] = offs;
     86		}
     87		msg[1].len = pcnt;
     88		msg[1].buf = eeprom+tcnt;
     89		if ((ret = i2c_transfer(&hdw->i2c_adap,
     90					msg,ARRAY_SIZE(msg))) != 2) {
     91			pvr2_trace(PVR2_TRACE_ERROR_LEGS,
     92				   "eeprom fetch set offs err=%d",ret);
     93			kfree(eeprom);
     94			return NULL;
     95		}
     96	}
     97	return eeprom;
     98}
     99
    100
    101/* Directly call eeprom analysis function within tveeprom. */
    102int pvr2_eeprom_analyze(struct pvr2_hdw *hdw)
    103{
    104	u8 *eeprom;
    105	struct tveeprom tvdata;
    106
    107	memset(&tvdata,0,sizeof(tvdata));
    108
    109	eeprom = pvr2_eeprom_fetch(hdw);
    110	if (!eeprom)
    111		return -EINVAL;
    112
    113	tveeprom_hauppauge_analog(&tvdata, eeprom);
    114
    115	trace_eeprom("eeprom assumed v4l tveeprom module");
    116	trace_eeprom("eeprom direct call results:");
    117	trace_eeprom("has_radio=%d",tvdata.has_radio);
    118	trace_eeprom("tuner_type=%d",tvdata.tuner_type);
    119	trace_eeprom("tuner_formats=0x%x",tvdata.tuner_formats);
    120	trace_eeprom("audio_processor=%d",tvdata.audio_processor);
    121	trace_eeprom("model=%d",tvdata.model);
    122	trace_eeprom("revision=%d",tvdata.revision);
    123	trace_eeprom("serial_number=%d",tvdata.serial_number);
    124	trace_eeprom("rev_str=%s",tvdata.rev_str);
    125	hdw->tuner_type = tvdata.tuner_type;
    126	hdw->tuner_updated = !0;
    127	hdw->serial_number = tvdata.serial_number;
    128	hdw->std_mask_eeprom = tvdata.tuner_formats;
    129
    130	kfree(eeprom);
    131
    132	return 0;
    133}