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/* Copyright 2014 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.
*/
/* Host command controller module for Chrome EC */
#include "common.h"
#include "console.h"
#include "host_command.h"
#include "i2c.h"
#include "task.h"
#include "timer.h"
#include "usb_pd.h"
#include "util.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_HOSTCMD, outstr)
#define CPRINTS(format, args...) cprints(CC_HOSTCMD, format, ## args)
#define CPRINTF(format, args...) cprintf(CC_HOSTCMD, format, ## args)
/* Number of attempts for each PD host command */
#define PD_HOST_COMMAND_ATTEMPTS 3
static struct mutex pd_mutex;
/**
* Non-task-safe internal version of pd_host_command().
*
* Do not call this version directly! Use pd_host_command().
*/
static int pd_host_command_internal(int command, int version,
const void *outdata, int outsize,
void *indata, int insize)
{
int ret, i;
int resp_len;
struct ec_host_request rq;
struct ec_host_response rs;
static uint8_t req_buf[EC_LPC_HOST_PACKET_SIZE];
static uint8_t resp_buf[EC_LPC_HOST_PACKET_SIZE];
uint8_t sum = 0;
const uint8_t *c;
uint8_t *d;
/* Fail if output size is too big */
if (outsize + sizeof(rq) > EC_LPC_HOST_PACKET_SIZE)
return -EC_RES_REQUEST_TRUNCATED;
/* Fill in request packet */
rq.struct_version = EC_HOST_REQUEST_VERSION;
rq.checksum = 0;
rq.command = command;
rq.command_version = version;
rq.reserved = 0;
rq.data_len = outsize;
/* Copy data and start checksum */
for (i = 0, c = (const uint8_t *)outdata; i < outsize; i++, c++) {
req_buf[sizeof(rq) + 1 + i] = *c;
sum += *c;
}
/* Finish checksum */
for (i = 0, c = (const uint8_t *)&rq; i < sizeof(rq); i++, c++)
sum += *c;
/* Write checksum field so the entire packet sums to 0 */
rq.checksum = (uint8_t)(-sum);
/* Copy header */
for (i = 0, c = (const uint8_t *)&rq; i < sizeof(rq); i++, c++)
req_buf[1 + i] = *c;
/* Set command to use protocol v3 */
req_buf[0] = EC_COMMAND_PROTOCOL_3;
/*
* Transmit all data and receive 2 bytes for return value and response
* length.
*/
i2c_lock(I2C_PORT_PD_MCU, 1);
i2c_set_timeout(I2C_PORT_PD_MCU, PD_HOST_COMMAND_TIMEOUT_US);
ret = i2c_xfer_unlocked(I2C_PORT_PD_MCU,
CONFIG_USB_PD_I2C_ADDR_FLAGS,
&req_buf[0], outsize + sizeof(rq) + 1,
&resp_buf[0], 2, I2C_XFER_START);
i2c_set_timeout(I2C_PORT_PD_MCU, 0);
if (ret) {
i2c_lock(I2C_PORT_PD_MCU, 0);
CPRINTS("i2c transaction 1 failed: %d", ret);
return -EC_RES_BUS_ERROR;
}
resp_len = resp_buf[1];
if (resp_len > (insize + sizeof(rs))) {
/* Do a read to generate stop condition */
i2c_xfer_unlocked(I2C_PORT_PD_MCU,
CONFIG_USB_PD_I2C_ADDR_FLAGS,
0, 0, &resp_buf[2], 1, I2C_XFER_STOP);
i2c_lock(I2C_PORT_PD_MCU, 0);
CPRINTS("response size is too large %d > %d",
resp_len, insize + sizeof(rs));
return -EC_RES_RESPONSE_TOO_BIG;
}
/* Receive remaining data */
ret = i2c_xfer_unlocked(I2C_PORT_PD_MCU,
CONFIG_USB_PD_I2C_ADDR_FLAGS,
0, 0,
&resp_buf[2], resp_len, I2C_XFER_STOP);
i2c_lock(I2C_PORT_PD_MCU, 0);
if (ret) {
CPRINTS("i2c transaction 2 failed: %d", ret);
return -EC_RES_BUS_ERROR;
}
/* Check for host command error code */
ret = resp_buf[0];
if (ret) {
CPRINTS("command 0x%02x returned error %d", command, ret);
return -ret;
}
/* Read back response header and start checksum */
sum = 0;
for (i = 0, d = (uint8_t *)&rs; i < sizeof(rs); i++, d++) {
*d = resp_buf[i + 2];
sum += *d;
}
if (rs.struct_version != EC_HOST_RESPONSE_VERSION) {
CPRINTS("PD response version mismatch");
return -EC_RES_INVALID_RESPONSE;
}
if (rs.reserved) {
CPRINTS("PD response reserved != 0");
return -EC_RES_INVALID_RESPONSE;
}
if (rs.data_len > insize) {
CPRINTS("PD returned too much data");
return -EC_RES_RESPONSE_TOO_BIG;
}
/* Read back data and update checksum */
resp_len -= sizeof(rs);
for (i = 0, d = (uint8_t *)indata; i < resp_len; i++, d++) {
*d = resp_buf[sizeof(rs) + i + 2];
sum += *d;
}
if ((uint8_t)sum) {
CPRINTS("command 0x%02x bad checksum returned: %d",
command, sum);
return -EC_RES_INVALID_CHECKSUM;
}
/* Return output buffer size */
return resp_len;
}
int pd_host_command(int command, int version,
const void *outdata, int outsize,
void *indata, int insize)
{
int rv;
int tries = 0;
/* Try multiple times to send host command. */
for (tries = 0; tries < PD_HOST_COMMAND_ATTEMPTS; tries++) {
/* Acquire mutex */
mutex_lock(&pd_mutex);
/* Call internal version of host command */
rv = pd_host_command_internal(command, version, outdata,
outsize, indata, insize);
/* Release mutex */
mutex_unlock(&pd_mutex);
/* If host command error due to i2c bus error, try again. */
if (rv != -EC_RES_BUS_ERROR)
break;
task_wait_event(50*MSEC);
}
return rv;
}
static int command_pd_mcu(int argc, char **argv)
{
char *e;
static char __bss_slow outbuf[128];
static char __bss_slow inbuf[128];
int command, version;
int i, ret, tmp;
if (argc < 3)
return EC_ERROR_PARAM_COUNT;
command = strtoi(argv[1], &e, 0);
if (*e)
return EC_ERROR_PARAM1;
version = strtoi(argv[2], &e, 0);
if (*e)
return EC_ERROR_PARAM2;
for (i = 3; i < argc; i++) {
tmp = strtoi(argv[i], &e, 0);
if (*e)
return EC_ERROR_PARAM3;
outbuf[i-3] = tmp;
}
ret = pd_host_command(command, version, &outbuf, argc - 3, &inbuf,
sizeof(inbuf));
ccprintf("Host command 0x%02x, returned %d\n", command, ret);
for (i = 0; i < ret; i++)
ccprintf("0x%02x\n", inbuf[i]);
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(pdcmd, command_pd_mcu,
"cmd ver [params]",
"Send PD host command");
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