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cmd: adc: Add support for storing ADC result in env variable 

Add the ability to save ADC conversion result in an environment
variable. This is useful for further arbitrary processing by the
U-Boot scripts.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Cc: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Patrick Delaunay <patrick.delaunay@foss.st.com>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
This commit is contained in:
Marek Vasut 2022-04-14 18:52:25 +02:00 committed by Tom Rini
parent 0de71bb580
commit 9de612ae4d
1 changed files with 14 additions and 4 deletions
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18
cmd/adc.c
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@ -71,13 +71,17 @@ static int do_adc_info(struct cmd_tbl *cmdtp, int flag, int argc,
static int do_adc_single(struct cmd_tbl *cmdtp, int flag, int argc, static int do_adc_single(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[]) char *const argv[])
{ {
char *varname = NULL;
struct udevice *dev; struct udevice *dev;
unsigned int data; unsigned int data;
int ret, uV; int ret, uV, val;
if (argc < 3) if (argc < 3)
return CMD_RET_USAGE; return CMD_RET_USAGE;
if (argc >= 3)
varname = argv[2];
ret = adc_channel_single_shot(argv[1], simple_strtol(argv[2], NULL, 0), ret = adc_channel_single_shot(argv[1], simple_strtol(argv[2], NULL, 0),
&data); &data);
if (ret) { if (ret) {
@ -87,10 +91,16 @@ static int do_adc_single(struct cmd_tbl *cmdtp, int flag, int argc,
} }
ret = uclass_get_device_by_name(UCLASS_ADC, argv[1], &dev); ret = uclass_get_device_by_name(UCLASS_ADC, argv[1], &dev);
if (!ret && !adc_raw_to_uV(dev, data, &uV)) if (!ret && !adc_raw_to_uV(dev, data, &uV)) {
val = uV;
printf("%u, %d uV\n", data, uV); printf("%u, %d uV\n", data, uV);
else } else {
val = data;
printf("%u\n", data); printf("%u\n", data);
}
if (varname)
env_set_ulong(varname, val);
return CMD_RET_SUCCESS; return CMD_RET_SUCCESS;
} }
@ -149,7 +159,7 @@ static int do_adc_scan(struct cmd_tbl *cmdtp, int flag, int argc,
static char adc_help_text[] = static char adc_help_text[] =
"list - list ADC devices\n" "list - list ADC devices\n"
"adc info <name> - Get ADC device info\n" "adc info <name> - Get ADC device info\n"
"adc single <name> <channel> - Get Single data of ADC device channel\n" "adc single <name> <channel> [varname] - Get Single data of ADC device channel\n"
"adc scan <name> [channel mask] - Scan all [or masked] ADC channels"; "adc scan <name> [channel mask] - Scan all [or masked] ADC channels";
U_BOOT_CMD_WITH_SUBCMDS(adc, "ADC sub-system", adc_help_text, U_BOOT_CMD_WITH_SUBCMDS(adc, "ADC sub-system", adc_help_text,