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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.
*/
/* GPIO common functionality for Chrome EC */
#include "common.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.
*
* @param name Signal name to find
*
* @return 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;
}
/**
* Update last_val
*
* @param i Index of last_val[] to update
* @param v New value for last_val[i]
*
* @return 1 if last_val[i] was updated, 0 if last_val[i]==v.
*/
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;
}
}
/*****************************************************************************/
/* GPIO API */
void gpio_config_module(enum module_id id, int enable)
{
const struct gpio_alt_func *af = gpio_alt_funcs;
int i;
/* Set module's pins to alternate functions */
for (i = 0; i < gpio_alt_funcs_count; i++, af++) {
if (id != af->module_id)
continue; /* Pins for some other module */
if (enable) {
gpio_set_flags_by_mask(af->port, af->mask, af->flags);
gpio_set_alternate_function(af->port, af->mask,
af->func);
} else {
gpio_set_flags_by_mask(af->port, af->mask, GPIO_INPUT);
gpio_set_alternate_function(af->port, af->mask, -1);
}
}
}
void gpio_set_flags(enum gpio_signal signal, int flags)
{
const struct gpio_info *g = gpio_list + signal;
gpio_set_flags_by_mask(g->port, g->mask, flags);
}
const char *gpio_get_name(enum gpio_signal signal)
{
return gpio_list[signal].name;
}
/*****************************************************************************/
/* 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);
/* Flush console to avoid truncating output */
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;
gpio_set_level(i, v);
return EC_SUCCESS;
}
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;
gpio_set_level(i, p->val);
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_GPIO_SET, gpio_command_set, EC_VER_MASK(0));
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