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//
// Copyright 2019 Ettus Research, a National Instruments Brand
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#include "common_helpers.h"
#include "common_const.h"
#include "common_descriptors.h"
#define UNREAD 0xFFFF
/* Check the rev, magic value, and eeprom compatibility field to determine if
our eeprom map is up-to-date with what is written on the device */
int eeprom_is_readable(eeprom_read_t read_fn) {
/* Only check this once, then store that info */
static int is_readable = UNREAD;
if (is_readable != UNREAD) {
return is_readable;
}
int rev = get_rev(read_fn);
if (rev == EEPROM_REV_UNRECOGNIZED)
{
is_readable = 0;
return is_readable;
}
/* If rev is 0, there's no further checks available */
if (rev == 0)
{
is_readable = 1;
return is_readable;
}
/* For rev 1, check the EEPROM magic value and compat number */
if (rev == 1) {
{
uint8_t buffer[EEPROM_MAGIC_LENGTH];
read_fn(EEPROM_REV1_MAGIC_ADDR, buffer, EEPROM_MAGIC_LENGTH);
if ((buffer[1] << 8 | buffer[0]) != EEPROM_EXPECTED_MAGIC) {
is_readable = 0;
return is_readable;
}
}
{
uint8_t buffer[EEPROM_COMPAT_LENGTH];
read_fn(EEPROM_REV1_COMPAT_ADDR, buffer, EEPROM_COMPAT_LENGTH);
if ((buffer[1] << 8 | buffer[0]) > EEPROM_EXPECTED_COMPAT) {
is_readable = 0;
return is_readable;
}
}
is_readable = 1;
return is_readable;
}
/* some other unrecognized rev */
is_readable = 0;
return is_readable;
}
/* Read the EEPROM layout revision number from EEPROM using the function
specified */
int get_rev(eeprom_read_t read_fn)
{
/* Only check the rev once, then store that info */
static int rev = UNREAD;
if (rev != UNREAD) {
return rev;
}
uint8_t buffer[EEPROM_SIGNATURE_LENGTH];
read_fn(EEPROM_SIGNATURE_ADDR, buffer, EEPROM_SIGNATURE_LENGTH);
const uint32_t signature = buffer[3] << 24 | buffer[2] << 16 | buffer[1] << 8
| buffer[0];
if (signature == EEPROM_REV0_SIGNATURE) {
rev = 0;
} else if (signature == EEPROM_REV1_OR_GREATER_SIGNATURE) {
rev = 1;
} else {
rev = EEPROM_REV_UNRECOGNIZED;
}
return rev;
}
/* Read the vendor ID from EEPROM using the function specified*/
uint16_t get_vid(eeprom_read_t read_fn)
{
static uint16_t vid = UNREAD;
if (vid != UNREAD) {
return vid;
}
if (!eeprom_is_readable(read_fn)) {
vid = VID_CYPRESS;
return vid;
}
// eeprom_is_readable guarantees rev is valid
int rev = get_rev(read_fn);
const uint16_t addr = (rev == 0) ? EEPROM_REV0_VID_ADDR : EEPROM_REV1_VID_ADDR;
uint8_t buffer[EEPROM_VID_LENGTH];
read_fn(addr, buffer, EEPROM_VID_LENGTH);
vid = buffer[1] << 8 | buffer[0];
return vid;
}
/* Read the product ID from EEPROM using the function specified*/
uint16_t get_pid(eeprom_read_t read_fn)
{
static uint16_t pid = UNREAD;
if (pid != UNREAD) {
return pid;
}
if (!eeprom_is_readable(read_fn)) {
pid = PID_CYPRESS_DEFAULT;
return pid;
}
// eeprom_is_readable guarantees rev is valid
int rev = get_rev(read_fn);
const uint16_t addr = (rev == 0) ? EEPROM_REV0_PID_ADDR : EEPROM_REV1_PID_ADDR;
uint8_t buffer[EEPROM_PID_LENGTH];
read_fn(addr, buffer, EEPROM_PID_LENGTH);
pid = buffer[1] << 8 | buffer[0];
return pid;
}
/* Read the vendor ID from EEPROM using the function specified */
const uint8_t* get_serial_string_descriptor(eeprom_read_t read_fn)
{
static uint8_t* serial_string_descriptor = 0;
if (serial_string_descriptor) {
return serial_string_descriptor;
}
/* All code paths will eventually return this value, but some will modify
it beforehand */
serial_string_descriptor = common_dev_serial_desc;
if (!eeprom_is_readable(read_fn)) {
return serial_string_descriptor;
}
// eeprom_is_readable guarantees rev is valid
int rev = get_rev(read_fn);
const uint16_t addr = (rev == 0) ? EEPROM_REV0_SERIAL_ADDR : EEPROM_REV1_SERIAL_ADDR;
uint8_t buffer[EEPROM_SERIAL_LENGTH];
read_fn(addr, buffer, EEPROM_SERIAL_LENGTH);
int i;
for (i = 0; i < EEPROM_SERIAL_LENGTH; ++i) {
common_dev_serial_desc[2 + i * 2] = buffer[i];
}
return serial_string_descriptor;
}
/* Return the string descriptor based on the VID given */
const uint8_t* get_manufacturer_string_descriptor(uint16_t vid)
{
if (vid == VID_ETTUS_RESEARCH) {
return common_ettus_manufacturer_desc;
} else if (vid == VID_NATIONAL_INSTRUMENTS) {
return common_ni_manufacturer_desc;
} else {
return common_unknown_desc;
}
}
/* Return the string descriptor based on the PID given */
const uint8_t* get_product_string_descriptor(uint16_t pid)
{
if (pid == PID_ETTUS_B200_B210) {
return common_b200_product_desc;
} else if (pid == PID_NI_USRP_2900) {
return common_niusrp_2900_product_desc;
} else if (pid == PID_NI_USRP_2901) {
return common_niusrp_2901_product_desc;
} else {
return common_unknown_desc;
}
}
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