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
  13 enum pwm_cmd {
  14         PWM_SET_INVERT,
  15         PWM_SET_CONFIG,
  16         PWM_SET_ENABLE,
  17         PWM_SET_DISABLE,
  18 };
  19
  20 static 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
 109 U_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> - disable PWM output\n"
 115            "Note: All input values are in decimal");