u-boot/cmd/pwm.c
Pragnesh Patel 9e9a530a61 cmd: Add a pwm command
Add the command "pwm" for controlling the pwm channels. This
command provides pwm invert/config/enable/disable functionalities
via PWM uclass drivers

Signed-off-by: Pragnesh Patel <pragnesh.patel@sifive.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2021-01-18 15:23:06 -05:00

117 lines
2.5 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Control PWM channels
*
* Copyright (c) 2020 SiFive, Inc
* author: Pragnesh Patel <pragnesh.patel@sifive.com>
*/
#include <command.h>
#include <dm.h>
#include <pwm.h>
enum pwm_cmd {
PWM_SET_INVERT,
PWM_SET_CONFIG,
PWM_SET_ENABLE,
PWM_SET_DISABLE,
};
static int do_pwm(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
const char *str_cmd, *str_channel = NULL, *str_enable = NULL;
const char *str_pwm = NULL, *str_period = NULL, *str_duty = NULL;
enum pwm_cmd sub_cmd;
struct udevice *dev;
u32 channel, pwm_enable, pwm_dev, period_ns = 0, duty_ns = 0;
int ret;
if (argc < 4)
return CMD_RET_USAGE;
str_cmd = argv[1];
argc -= 2;
argv += 2;
if (argc > 0) {
str_pwm = *argv;
argc--;
argv++;
}
if (!str_pwm)
return CMD_RET_USAGE;
switch (*str_cmd) {
case 'i':
sub_cmd = PWM_SET_INVERT;
break;
case 'c':
sub_cmd = PWM_SET_CONFIG;
break;
case 'e':
sub_cmd = PWM_SET_ENABLE;
break;
case 'd':
sub_cmd = PWM_SET_DISABLE;
break;
default:
return CMD_RET_USAGE;
}
pwm_dev = simple_strtoul(str_pwm, NULL, 10);
ret = uclass_get_device(UCLASS_PWM, pwm_dev, &dev);
if (ret) {
printf("pwm: '%s' not found\n", str_pwm);
return cmd_process_error(cmdtp, ret);
}
if (argc > 0) {
str_channel = *argv;
channel = simple_strtoul(str_channel, NULL, 10);
argc--;
argv++;
} else {
return CMD_RET_USAGE;
}
if (sub_cmd == PWM_SET_INVERT && argc > 0) {
str_enable = *argv;
pwm_enable = simple_strtoul(str_enable, NULL, 10);
ret = pwm_set_invert(dev, channel, pwm_enable);
} else if (sub_cmd == PWM_SET_CONFIG && argc == 2) {
str_period = *argv;
argc--;
argv++;
period_ns = simple_strtoul(str_period, NULL, 10);
if (argc > 0) {
str_duty = *argv;
duty_ns = simple_strtoul(str_duty, NULL, 10);
}
ret = pwm_set_config(dev, channel, period_ns, duty_ns);
} else if (sub_cmd == PWM_SET_ENABLE) {
ret = pwm_set_enable(dev, channel, 1);
} else if (sub_cmd == PWM_SET_DISABLE) {
ret = pwm_set_enable(dev, channel, 0);
} else {
printf("PWM arguments missing\n");
return CMD_RET_FAILURE;
}
if (ret) {
printf("error(%d)\n", ret);
return CMD_RET_FAILURE;
}
return CMD_RET_SUCCESS;
}
U_BOOT_CMD(pwm, 6, 0, do_pwm,
"control pwm channels",
"pwm <invert> <pwm_dev_num> <channel> <polarity>\n"
"pwm <config> <pwm_dev_num> <channel> <period_ns> <duty_ns>\n"
"pwm <enable/disable> <pwm_dev_num> <channel>\n"
"Note: All input values are in decimal");