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/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "cros_ec_dev.h"
#include "comm-host.h"
#include "ec_commands.h"
static int fd = -1;
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(t) (sizeof(t) / sizeof(t[0]))
#endif
static const char const *meanings[] = {
"SUCCESS",
"INVALID_COMMAND",
"ERROR",
"INVALID_PARAM",
"ACCESS_DENIED",
"INVALID_RESPONSE",
"INVALID_VERSION",
"INVALID_CHECKSUM",
"IN_PROGRESS",
"UNAVAILABLE",
"TIMEOUT",
"OVERFLOW",
"INVALID_HEADER",
"REQUEST_TRUNCATED",
"RESPONSE_TOO_BIG",
"BUS_ERROR"
};
static const char *strresult(int i)
{
if (i < 0 || i >= ARRAY_SIZE(meanings))
return "<unknown>";
return meanings[i];
}
static int ec_command_dev(int command, int version,
const void *outdata, int outsize,
void *indata, int insize)
{
struct cros_ec_command s_cmd;
int r;
s_cmd.command = command;
s_cmd.version = version;
s_cmd.result = 0xff;
s_cmd.outsize = outsize;
s_cmd.outdata = (uint8_t *)outdata;
s_cmd.insize = insize;
s_cmd.indata = indata;
r = ioctl(fd, CROS_EC_DEV_IOCXCMD, &s_cmd);
if (r < 0) {
fprintf(stderr, "ioctl %d, errno %d (%s), EC result %d (%s)\n",
r, errno, strerror(errno), s_cmd.result,
strresult(s_cmd.result));
if (errno == EAGAIN && s_cmd.result == EC_RES_IN_PROGRESS) {
s_cmd.command = EC_CMD_RESEND_RESPONSE;
r = ioctl(fd, CROS_EC_DEV_IOCXCMD, &s_cmd);
fprintf(stderr,
"ioctl %d, errno %d (%s), EC result %d (%s)\n",
r, errno, strerror(errno), s_cmd.result,
strresult(s_cmd.result));
}
} else if (s_cmd.result != EC_RES_SUCCESS) {
fprintf(stderr, "EC result %d (%s)\n", s_cmd.result,
strresult(s_cmd.result));
return -EECRESULT - s_cmd.result;
}
return r;
}
static int ec_readmem_dev(int offset, int bytes, void *dest)
{
struct cros_ec_readmem s_mem;
struct ec_params_read_memmap r_mem;
int r;
static int fake_it;
if (!fake_it) {
s_mem.offset = offset;
s_mem.bytes = bytes;
s_mem.buffer = dest;
r = ioctl(fd, CROS_EC_DEV_IOCRDMEM, &s_mem);
if (r < 0 && errno == ENOTTY)
fake_it = 1;
else
return r;
}
r_mem.offset = offset;
r_mem.size = bytes;
return ec_command_dev(EC_CMD_READ_MEMMAP, 0,
&r_mem, sizeof(r_mem),
dest, bytes);
}
int comm_init_dev(const char *device_name)
{
char version[80];
char device[80] = "/dev/";
int r;
char *s;
strncat(device, (device_name ? device_name : CROS_EC_DEV_NAME), 40);
fd = open(device, O_RDWR);
if (fd < 0)
return 1;
r = read(fd, version, sizeof(version)-1);
if (r <= 0) {
close(fd);
return 2;
}
version[r] = '\0';
s = strchr(version, '\n');
if (s)
*s = '\0';
if (strcmp(version, CROS_EC_DEV_VERSION)) {
close(fd);
return 3;
}
ec_command_proto = ec_command_dev;
if (ec_readmem_dev(EC_MEMMAP_ID, 2, version) == 2 &&
version[0] == 'E' && version[1] == 'C')
ec_readmem = ec_readmem_dev;
/*
* TODO(crosbug.com/p/23823): Need a way to get this from the driver
* and EC. For now, pick a magic lowest common denominator value. The
* ec_max_outsize is set to handle v3 EC protocol. The ec_max_insize
* needs to be set to the largest value that can be returned from the
* EC, EC_PROTO2_MAX_PARAM_SIZE.
*/
ec_max_outsize = EC_PROTO2_MAX_PARAM_SIZE - 8;
ec_max_insize = EC_PROTO2_MAX_PARAM_SIZE;
return 0;
}
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