cmd/adc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2018 BayLibre, SAS
   4  * Author: Neil Armstrong <narmstrong@baylibre.com>
   5  */
   6 #include <command.h>
   7 #include <dm.h>
   8 #include <adc.h>
   9 #include <linux/printk.h>
  10
  11 static int do_adc_list(struct cmd_tbl *cmdtp, int flag, int argc,
  12                        char *const argv[])
  13 {
  14         struct udevice *dev;
  15         int ret, err;
  16
  17         ret = err = uclass_first_device_check(UCLASS_ADC, &dev);
  18
  19         while (dev) {
  20                 printf("- %s status: %i\n", dev->name, ret);
  21
  22                 ret = uclass_next_device_check(&dev);
  23                 if (ret)
  24                         err = ret;
  25         }
  26
  27         return err ? CMD_RET_FAILURE : CMD_RET_SUCCESS;
  28 }
  29
  30 static int do_adc_info(struct cmd_tbl *cmdtp, int flag, int argc,
  31                        char *const argv[])
  32 {
  33         struct udevice *dev;
  34         unsigned int data_mask, ch_mask;
  35         int ret, vss, vdd;
  36
  37         if (argc < 2)
  38                 return CMD_RET_USAGE;
  39
  40         ret = uclass_get_device_by_name(UCLASS_ADC, argv[1], &dev);
  41         if (ret) {
  42                 printf("Unknown ADC device %s\n", argv[1]);
  43                 return CMD_RET_FAILURE;
  44         }
  45
  46         printf("ADC Device '%s' :\n", argv[1]);
  47
  48         ret = adc_channel_mask(dev, &ch_mask);
  49         if (!ret)
  50                 printf("channel mask: %x\n", ch_mask);
  51
  52         ret = adc_data_mask(dev, &data_mask);
  53         if (!ret)
  54                 printf("data mask: %x\n", data_mask);
  55
  56         ret = adc_vdd_value(dev, &vdd);
  57         if (!ret)
  58                 printf("vdd: %duV\n", vdd);
  59
  60         ret = adc_vss_value(dev, &vss);
  61         if (!ret)
  62                 printf("vss: %duV\n", vss);
  63
  64         return CMD_RET_SUCCESS;
  65 }
  66
  67 static int do_adc_single(struct cmd_tbl *cmdtp, int flag, int argc,
  68                          char *const argv[])
  69 {
  70         char *varname = NULL;
  71         struct udevice *dev;
  72         unsigned int data;
  73         int ret, uV, val;
  74
  75         if (argc < 3)
  76                 return CMD_RET_USAGE;
  77
  78         if (argc >= 4)
  79                 varname = argv[3];
  80
  81         ret = adc_channel_single_shot(argv[1], simple_strtol(argv[2], NULL, 0),
  82                                       &data);
  83         if (ret) {
  84                 printf("Error getting single shot for device %s channel %s (ret=%d)\n",
  85                        argv[1], argv[2], ret);
  86                 return CMD_RET_FAILURE;
  87         }
  88
  89         ret = uclass_get_device_by_name(UCLASS_ADC, argv[1], &dev);
  90         if (!ret && !adc_raw_to_uV(dev, data, &uV)) {
  91                 val = uV;
  92                 printf("%u, %d uV\n", data, uV);
  93         } else {
  94                 val = data;
  95                 printf("%u\n", data);
  96         }
  97
  98         if (varname)
  99                 env_set_ulong(varname, val);
 100
 101         return CMD_RET_SUCCESS;
 102 }
 103
 104 static int do_adc_scan(struct cmd_tbl *cmdtp, int flag, int argc,
 105                        char *const argv[])
 106 {
 107         struct adc_channel ch[ADC_MAX_CHANNEL];
 108         struct udevice *dev;
 109         unsigned int ch_mask;
 110         int i, chan, ret, uV;
 111
 112         if (argc < 2)
 113                 return CMD_RET_USAGE;
 114
 115         ret = uclass_get_device_by_name(UCLASS_ADC, argv[1], &dev);
 116         if (ret) {
 117                 pr_err("Can't get the ADC %s: %d\n", argv[1], ret);
 118                 return CMD_RET_FAILURE;
 119         }
 120
 121         switch (argc) {
 122         case 3:
 123                 ch_mask = simple_strtoul(argv[2], NULL, 0);
 124                 if (ch_mask)
 125                         break;
 126         case 2:
 127                 ret = adc_channel_mask(dev, &ch_mask);
 128                 if (ret) {
 129                         pr_err("Can't get mask for %s: %d\n", dev->name, ret);
 130                         return CMD_RET_FAILURE;
 131                 }
 132                 break;
 133         }
 134
 135         ret = adc_channels_single_shot(dev->name, ch_mask, ch);
 136         if (ret) {
 137                 pr_err("Can't get single shot for %s (chans mask: 0x%x): %d\n",
 138                        dev->name, ch_mask, ret);
 139                 return CMD_RET_FAILURE;
 140         }
 141
 142         for (chan = 0, i = 0; chan < ADC_MAX_CHANNEL; chan++) {
 143                 if (!(ch_mask & ADC_CHANNEL(chan)))
 144                         continue;
 145                 if (!adc_raw_to_uV(dev, ch[i].data, &uV))
 146                         printf("[%02d]: %u, %d uV\n", ch[i].id, ch[i].data, uV);
 147                 else
 148                         printf("[%02d]: %u\n", ch[i].id, ch[i].data);
 149                 i++;
 150         }
 151
 152         return CMD_RET_SUCCESS;
 153 }
 154
 155 U_BOOT_LONGHELP(adc,
 156         "list - list ADC devices\n"
 157         "adc info <name> - Get ADC device info\n"
 158         "adc single <name> <channel> [varname] - Get Single data of ADC device channel\n"
 159         "adc scan <name> [channel mask] - Scan all [or masked] ADC channels\n");
 160
 161 U_BOOT_CMD_WITH_SUBCMDS(adc, "ADC sub-system", adc_help_text,
 162         U_BOOT_SUBCMD_MKENT(list, 1, 1, do_adc_list),
 163         U_BOOT_SUBCMD_MKENT(info, 2, 1, do_adc_info),
 164         U_BOOT_SUBCMD_MKENT(single, 4, 1, do_adc_single),
 165         U_BOOT_SUBCMD_MKENT(scan, 3, 1, do_adc_scan));