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/* Copyright (c) 2012 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.
*/
/* GPIO console commands for Chrome EC */
#include "board.h"
#include "console.h"
#include "gpio.h"
#include "host_command.h"
#include "system.h"
#include "util.h"
static uint8_t last_val[(GPIO_COUNT + 7) / 8];
/* Find a GPIO signal by name. Returns the signal index, or GPIO_COUNT if
* no match. */
static enum gpio_signal find_signal_by_name(const char *name)
{
const struct gpio_info *g = gpio_list;
int i;
if (!name || !*name)
return GPIO_COUNT;
for (i = 0; i < GPIO_COUNT; i++, g++) {
if (!strcasecmp(name, g->name))
return i;
}
return GPIO_COUNT;
}
/* If v is different from the last value for index i, updates the last value
* and returns 1; else returns 0. */
static int last_val_changed(int i, int v)
{
if (v && !(last_val[i / 8] & (1 << (i % 8)))) {
last_val[i / 8] |= 1 << (i % 8);
return 1;
} else if (!v && last_val[i / 8] & (1 << (i % 8))) {
last_val[i / 8] &= ~(1 << (i % 8));
return 1;
} else {
return 0;
}
}
/*****************************************************************************/
/* Console commands */
static int command_gpio_get(int argc, char **argv)
{
const struct gpio_info *g = gpio_list;
int changed, v, i;
/* If a signal is specified, print only that one */
if (argc == 2) {
i = find_signal_by_name(argv[1]);
if (i == GPIO_COUNT)
return EC_ERROR_PARAM1;
g = gpio_list + i;
v = gpio_get_level(i);
changed = last_val_changed(i, v);
ccprintf(" %d%c %s\n", v, (changed ? '*' : ' '), g->name);
return EC_SUCCESS;
}
/* Otherwise print them all */
for (i = 0; i < GPIO_COUNT; i++, g++) {
if (!g->mask)
continue; /* Skip unsupported signals */
v = gpio_get_level(i);
changed = last_val_changed(i, v);
ccprintf(" %d%c %s\n", v, (changed ? '*' : ' '), g->name);
/* We have enough GPIOs that we'll overflow the output buffer
* without flushing */
cflush();
}
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(gpioget, command_gpio_get,
"[name]",
"Read GPIO value(s)",
NULL);
static int command_gpio_set(int argc, char **argv)
{
const struct gpio_info *g;
char *e;
int v, i;
if (argc < 3)
return EC_ERROR_PARAM_COUNT;
i = find_signal_by_name(argv[1]);
if (i == GPIO_COUNT)
return EC_ERROR_PARAM1;
g = gpio_list + i;
if (!g->mask)
return EC_ERROR_PARAM1;
if (!(g->flags & GPIO_OUTPUT))
return EC_ERROR_PARAM1;
v = strtoi(argv[2], &e, 0);
if (*e)
return EC_ERROR_PARAM2;
return gpio_set_level(i, v);
}
DECLARE_CONSOLE_COMMAND(gpioset, command_gpio_set,
"name <0 | 1>",
"Set a GPIO",
NULL);
/*****************************************************************************/
/* Host commands */
static int gpio_command_get(struct host_cmd_handler_args *args)
{
const struct ec_params_gpio_get *p = args->params;
struct ec_response_gpio_get *r = args->response;
int i;
if (system_is_locked())
return EC_RES_ACCESS_DENIED;
i = find_signal_by_name(p->name);
if (i == GPIO_COUNT)
return EC_RES_ERROR;
r->val = gpio_get_level(i);
args->response_size = sizeof(struct ec_response_gpio_get);
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_GPIO_GET, gpio_command_get, EC_VER_MASK(0));
static int gpio_command_set(struct host_cmd_handler_args *args)
{
const struct ec_params_gpio_set *p = args->params;
const struct gpio_info *g;
int i;
if (system_is_locked())
return EC_RES_ACCESS_DENIED;
i = find_signal_by_name(p->name);
if (i == GPIO_COUNT)
return EC_RES_ERROR;
g = gpio_list + i;
if (!g->mask)
return EC_RES_ERROR;
if (!(g->flags & GPIO_OUTPUT))
return EC_RES_ERROR;
if (gpio_set_level(i, p->val) != EC_SUCCESS)
return EC_RES_ERROR;
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_GPIO_SET, gpio_command_set, EC_VER_MASK(0));
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