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dm: demo: Add a simple GPIO demonstration

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Add a new 'demo light' command which uses GPIOs to control imaginary lights.
Each light is assigned a bit number in the overall value. This provides an
example driver for using the new GPIO API.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2015-01-05 20:05:31 -07:00
parent 5d1c17e9a5
commit a02af4aeec
5 changed files with 133 additions and 2 deletions
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29
common/cmd_demo.c
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@@ -39,6 +39,26 @@ static int do_demo_status(cmd_tbl_t *cmdtp, int flag, int argc,
return 0;
}
static int do_demo_light(cmd_tbl_t *cmdtp, int flag, int argc,
char * const argv[])
{
int light;
int ret;
if (argc) {
light = simple_strtoul(argv[0], NULL, 16);
ret = demo_set_light(demo_dev, light);
} else {
ret = demo_get_light(demo_dev);
if (ret >= 0) {
printf("Light: %x\n", ret);
ret = 0;
}
}
return ret;
}
int do_demo_list(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
struct udevice *dev;
@@ -61,6 +81,7 @@ int do_demo_list(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
static cmd_tbl_t demo_commands[] = {
U_BOOT_CMD_MKENT(list, 0, 1, do_demo_list, "", ""),
U_BOOT_CMD_MKENT(hello, 2, 1, do_demo_hello, "", ""),
U_BOOT_CMD_MKENT(light, 2, 1, do_demo_light, "", ""),
U_BOOT_CMD_MKENT(status, 1, 1, do_demo_status, "", ""),
};
@@ -86,6 +107,10 @@ static int do_demo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
return cmd_process_error(cmdtp, ret);
argc--;
argv++;
} else {
demo_dev = NULL;
if (demo_cmd->cmd != do_demo_list)
return CMD_RET_USAGE;
}
ret = demo_cmd->cmd(demo_cmd, flag, argc, argv);
@@ -98,5 +123,7 @@ U_BOOT_CMD(
"Driver model (dm) demo operations",
"list List available demo devices\n"
"demo hello <num> [<char>] Say hello\n"
"demo status <num> Get demo device status"
"demo light [<num>] Set or get the lights\n"
"demo status <num> Get demo device status\n"
"demo list List available demo devices"
);