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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 <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "comm-host.h"
#include "ec_commands.h"
#include "misc_util.h"
int (*ec_command_proto)(int command, int version,
const void *outdata, int outsize,
void *indata, int insize);
int (*ec_readmem)(int offset, int bytes, void *dest);
int ec_max_outsize, ec_max_insize;
void *ec_outbuf;
void *ec_inbuf;
static int command_offset;
int comm_init_dev(const char *device_name) __attribute__((weak));
int comm_init_lpc(void) __attribute__((weak));
int comm_init_i2c(void) __attribute__((weak));
static int fake_readmem(int offset, int bytes, void *dest)
{
struct ec_params_read_memmap p;
int c;
char *buf;
p.offset = offset;
if (bytes) {
p.size = bytes;
c = ec_command(EC_CMD_READ_MEMMAP, 0, &p, sizeof(p),
dest, p.size);
if (c < 0)
return c;
return p.size;
}
p.size = EC_MEMMAP_TEXT_MAX;
c = ec_command(EC_CMD_READ_MEMMAP, 0, &p, sizeof(p), dest, p.size);
if (c < 0)
return c;
buf = dest;
for (c = 0; c < EC_MEMMAP_TEXT_MAX; c++) {
if (buf[c] == 0)
return c;
}
buf[EC_MEMMAP_TEXT_MAX - 1] = 0;
return EC_MEMMAP_TEXT_MAX - 1;
}
void set_command_offset(int offset)
{
command_offset = offset;
}
int ec_command(int command, int version,
const void *outdata, int outsize,
void *indata, int insize)
{
/* Offset command code to support sub-devices */
return ec_command_proto(command_offset + command, version,
outdata, outsize,
indata, insize);
}
int comm_init(int interfaces, const char *device_name)
{
struct ec_response_get_protocol_info info;
int allow_large_buffer;
/* Default memmap access */
ec_readmem = fake_readmem;
allow_large_buffer = kernel_version_ge(3, 14, 0);
if (allow_large_buffer < 0) {
fprintf(stderr, "Unable to check linux version\n");
return 1;
}
/* Prefer new /dev method */
if ((interfaces & COMM_DEV) && comm_init_dev &&
!comm_init_dev(device_name))
goto init_ok;
/* Fallback to direct LPC on x86 */
if ((interfaces & COMM_LPC) && comm_init_lpc && !comm_init_lpc())
goto init_ok;
/* Fallback to direct i2c on ARM */
if ((interfaces & COMM_I2C) && comm_init_i2c && !comm_init_i2c())
goto init_ok;
/* Give up */
fprintf(stderr, "Unable to establish host communication\n");
return 1;
init_ok:
/* Allocate shared I/O buffers */
ec_outbuf = malloc(ec_max_outsize);
ec_inbuf = malloc(ec_max_insize);
if (!ec_outbuf || !ec_inbuf) {
fprintf(stderr, "Unable to allocate buffers\n");
return 1;
}
/* read max request / response size from ec for protocol v3+ */
if (ec_command(EC_CMD_GET_PROTOCOL_INFO, 0, NULL, 0, &info,
sizeof(info)) == sizeof(info)) {
int outsize = info.max_request_packet_size -
sizeof(struct ec_host_request);
int insize = info.max_response_packet_size -
sizeof(struct ec_host_response);
if ((allow_large_buffer) || (outsize < ec_max_outsize))
ec_max_outsize = outsize;
if ((allow_large_buffer) || (insize < ec_max_insize))
ec_max_insize = insize;
ec_outbuf = realloc(ec_outbuf, ec_max_outsize);
ec_inbuf = realloc(ec_inbuf, ec_max_insize);
if (!ec_outbuf || !ec_inbuf) {
fprintf(stderr, "Unable to reallocate buffers\n");
return 1;
}
}
return 0;
}
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