LXR uboot/cmd/pwm.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Control PWM channels
   4 *
   5 * Copyright (c) 2020 SiFive, Inc
   6 * author: Pragnesh Patel <pragnesh.patel@sifive.com>
   7 */
   8
   9#include <command.h>
  10#include <dm.h>
  11#include <pwm.h>
  12
  13enum pwm_cmd {
  14        PWM_SET_INVERT,
  15        PWM_SET_CONFIG,
  16        PWM_SET_ENABLE,
  17        PWM_SET_DISABLE,
  18};
  19
  20static int do_pwm(struct cmd_tbl *cmdtp, int flag, int argc,
  21                  char *const argv[])
  22{
  23        const char *str_cmd, *str_channel = NULL, *str_enable = NULL;
  24        const char *str_pwm = NULL, *str_period = NULL, *str_duty = NULL;
  25        enum pwm_cmd sub_cmd;
  26        struct udevice *dev;
  27        u32 channel, pwm_enable, pwm_dev, period_ns = 0, duty_ns = 0;
  28        int ret;
  29
  30        if (argc < 4)
  31                return CMD_RET_USAGE;
  32
  33        str_cmd = argv[1];
  34        argc -= 2;
  35        argv += 2;
  36
  37        str_pwm = *argv;
  38        argc--;
  39        argv++;
  40
  41        if (!str_pwm)
  42                return CMD_RET_USAGE;
  43
  44        switch (*str_cmd) {
  45        case 'i':
  46                sub_cmd = PWM_SET_INVERT;
  47                if (argc != 2)
  48                        return CMD_RET_USAGE;
  49                break;
  50        case 'c':
  51                sub_cmd = PWM_SET_CONFIG;
  52                if (argc != 3)
  53                        return CMD_RET_USAGE;
  54                break;
  55        case 'e':
  56                sub_cmd = PWM_SET_ENABLE;
  57                if (argc != 1)
  58                        return CMD_RET_USAGE;
  59                break;
  60        case 'd':
  61                sub_cmd = PWM_SET_DISABLE;
  62                if (argc != 1)
  63                        return CMD_RET_USAGE;
  64                break;
  65        default:
  66                return CMD_RET_USAGE;
  67        }
  68
  69        pwm_dev = dectoul(str_pwm, NULL);
  70        ret = uclass_get_device(UCLASS_PWM, pwm_dev, &dev);
  71        if (ret) {
  72                printf("pwm: '%s' not found\n", str_pwm);
  73                return cmd_process_error(cmdtp, ret);
  74        }
  75
  76        str_channel = *argv;
  77        channel = dectoul(str_channel, NULL);
  78        argc--;
  79        argv++;
  80
  81        if (sub_cmd == PWM_SET_INVERT) {
  82                str_enable = *argv;
  83                pwm_enable = dectoul(str_enable, NULL);
  84                ret = pwm_set_invert(dev, channel, pwm_enable);
  85        } else if (sub_cmd == PWM_SET_CONFIG) {
  86                str_period = *argv;
  87                argc--;
  88                argv++;
  89                period_ns = dectoul(str_period, NULL);
  90
  91                str_duty = *argv;
  92                duty_ns = dectoul(str_duty, NULL);
  93
  94                ret = pwm_set_config(dev, channel, period_ns, duty_ns);
  95        } else if (sub_cmd == PWM_SET_ENABLE) {
  96                ret = pwm_set_enable(dev, channel, 1);
  97        } else if (sub_cmd == PWM_SET_DISABLE) {
  98                ret = pwm_set_enable(dev, channel, 0);
  99        }
 100
 101        if (ret) {
 102                printf("error(%d)\n", ret);
 103                return CMD_RET_FAILURE;
 104        }
 105
 106        return CMD_RET_SUCCESS;
 107}
 108
 109U_BOOT_CMD(pwm, 6, 0, do_pwm,
 110           "control pwm channels",
 111           "invert <pwm_dev_num> <channel> <polarity> - invert polarity\n"
 112           "pwm config <pwm_dev_num> <channel> <period_ns> <duty_ns> - config PWM\n"
 113           "pwm enable <pwm_dev_num> <channel> - enable PWM output\n"
 114           "pwm disable <pwm_dev_num> <channel> - eisable PWM output\n"
 115           "Note: All input values are in decimal");
 116