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authorSimon Glass <sjg@chromium.org>2015-01-05 20:05:31 -0700
committerSimon Glass <sjg@chromium.org>2015-01-29 17:09:51 -0700
commita02af4aeece40e93bc7d79cd5dc912409efb7020 (patch)
tree799cf6f844e86be0164e4cc1649b62d1c9911eb5 /common/cmd_demo.c
parent5d1c17e9a5803af9c65966e469437735ac29659e (diff)
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dm: demo: Add a simple GPIO demonstration
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>
Diffstat (limited to 'common/cmd_demo.c')
-rw-r--r--common/cmd_demo.c29
1 files changed, 28 insertions, 1 deletions
diff --git a/common/cmd_demo.c b/common/cmd_demo.c
index 652c61c..bcb34d9 100644
--- a/common/cmd_demo.c
+++ b/common/cmd_demo.c
@@ -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"
);