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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 "common.h"
#include "console.h"
#include "gpio.h"
#include "hooks.h"
#include "host_command.h"
#include "pwm.h"
#include "util.h"
#ifdef CONFIG_PWM
/*
* Get target channel based on type / index host command parameters.
* Returns 0 if a valid channel is selected, -1 on error.
*/
static int get_target_channel(enum pwm_channel *channel, int type, int index)
{
switch (type) {
case EC_PWM_TYPE_GENERIC:
*channel = index;
break;
#ifdef CONFIG_PWM_KBLIGHT
case EC_PWM_TYPE_KB_LIGHT:
*channel = PWM_CH_KBLIGHT;
break;
#endif
#ifdef CONFIG_PWM_DISPLIGHT
case EC_PWM_TYPE_DISPLAY_LIGHT:
*channel = PWM_CH_DISPLIGHT;
break;
#endif
default:
return -1;
}
return *channel >= PWM_CH_COUNT;
}
/*
* TODO(crbug.com/615109): These host commands use 16 bit duty cycle, but
* all of our internal code uses percent on [0, 100]. Convert internal
* functions to use 16 bit duty and remove the conversions below.
*/
static int host_command_pwm_set_duty(struct host_cmd_handler_args *args)
{
const struct ec_params_pwm_set_duty *p = args->params;
enum pwm_channel channel;
int percent;
/* Convert 16 bit duty to percent on [0, 100] */
percent = DIV_ROUND_NEAREST(p->duty * 100, EC_PWM_MAX_DUTY);
if (get_target_channel(&channel, p->pwm_type, p->index))
return EC_RES_INVALID_PARAM;
pwm_set_duty(channel, percent);
pwm_enable(channel, percent > 0);
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_PWM_SET_DUTY,
host_command_pwm_set_duty,
EC_VER_MASK(0));
static int host_command_pwm_get_duty(struct host_cmd_handler_args *args)
{
const struct ec_params_pwm_get_duty *p = args->params;
struct ec_response_pwm_get_duty *r = args->response;
enum pwm_channel channel;
if (get_target_channel(&channel, p->pwm_type, p->index))
return EC_RES_INVALID_PARAM;
/* Convert percent on [0, 100] to 16 bit duty */
r->duty = pwm_get_duty(channel) * EC_PWM_MAX_DUTY / 100;
args->response_size = sizeof(*r);
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_PWM_GET_DUTY,
host_command_pwm_get_duty,
EC_VER_MASK(0));
/**
* Print status of a PWM channel.
*
* @param ch Channel to print.
*/
static void print_channel(enum pwm_channel ch)
{
if (pwm_get_enabled(ch))
ccprintf(" %d: %d%%\n", ch, pwm_get_duty(ch));
else
ccprintf(" %d: disabled\n", ch);
}
static int cc_pwm_duty(int argc, char **argv)
{
int percent = 0;
int ch;
char *e;
if (argc < 2) {
ccprintf("PWM channels:\n");
for (ch = 0; ch < PWM_CH_COUNT; ch++)
print_channel(ch);
return EC_SUCCESS;
}
ch = strtoi(argv[1], &e, 0);
if (*e || ch < 0 || ch >= PWM_CH_COUNT)
return EC_ERROR_PARAM1;
if (argc > 2) {
percent = strtoi(argv[2], &e, 0);
if (*e || percent > 100) {
/* Bad param */
return EC_ERROR_PARAM1;
} else if (percent < 0) {
/* Negative = disable */
pwm_enable(ch, 0);
} else {
ccprintf("Setting channel %d to %d%%\n", ch, percent);
pwm_enable(ch, 1);
pwm_set_duty(ch, percent);
}
}
print_channel(ch);
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(pwmduty, cc_pwm_duty,
"[channel [<percent> | -1=disable]]",
"Get/set PWM duty cycles ");
#endif /* CONFIG_PWM */
/* Initialize all PWM pins as functional */
static void pwm_pin_init(void)
{
gpio_config_module(MODULE_PWM, 1);
}
/* HOOK_PRIO_INIT_PWM may be used for chip PWM unit init, so use PRIO + 1 */
DECLARE_HOOK(HOOK_INIT, pwm_pin_init, HOOK_PRIO_INIT_PWM + 1);
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