Add button command

board/amlogic/m8b_onecloud/button.c

@@ -0,0 +1,94 @@
+#include <common.h>
+
+#include <asm/errno.h>
+#include <amlogic/gpio.h>
+#include <command.h>
+
+typedef enum BUTTON_ID {
+	BUTTON_ID_RESET = 0,
+
+	BUTTON_ID_INVALID,
+} BUTTON_ID;
+
+static const char *button_id_lable[] = {
+	[BUTTON_ID_RESET]	 = "reset",
+};
+
+typedef enum BUTTON_STATE {
+	BUTTON_STATE_RELEASED,
+	BUTTON_STATE_PRESSED,
+
+	BUTTON_STATE_INVALID,
+} BUTTON_STATE;
+
+static const char *button_state_label[] = {
+	[BUTTON_STATE_RELEASED]	 = "released",
+	[BUTTON_STATE_PRESSED]	 = "pressed",
+};
+
+static BUTTON_ID onecloud_button_getId(const char *label)
+{
+	BUTTON_ID id;
+	for(id = 0; id < BUTTON_ID_INVALID; id++)
+		if(strcmp(label, button_id_lable[id]) == 0)
+			return id;
+
+	return BUTTON_ID_INVALID;
+}
+
+static int onecloud_button_getPin(BUTTON_ID id)
+{
+	if(id == BUTTON_ID_RESET)
+		return GPIOAO_5;
+	else
+		return -EINVAL;
+}
+
+static BUTTON_STATE onecloud_button_get(BUTTON_ID id)
+{
+	int pin = onecloud_button_getPin(id);
+	if(pin < 0)
+		return BUTTON_STATE_INVALID;
+
+	amlogic_gpio_direction_input(pin);
+	return ((amlogic_get_value(pin) == 0) ? BUTTON_STATE_PRESSED : BUTTON_STATE_RELEASED);
+}
+
+void onecloud_button_init(void)
+{
+	onecloud_button_get(BUTTON_ID_RESET);
+}
+
+int do_button(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+	if (argc < 2)
+		return cmd_usage(cmdtp);
+
+	if(strcmp(argv[1], "list") == 0) {
+		// List buttons
+		BUTTON_ID id;
+		for(id = 0; id < BUTTON_ID_INVALID; id++) {
+			BUTTON_STATE state = onecloud_button_get(id);
+			printf("%s\t%s\n", button_id_lable[id], button_state_label[state]);
+		}
+		return 0;
+	}
+
+	BUTTON_ID id = onecloud_button_getId(argv[1]);
+	if(id >= BUTTON_ID_INVALID) {
+		printf("Button '%s' not found\n", argv[1]);
+		return 1;
+	}
+
+	// Show button state
+	BUTTON_STATE state = onecloud_button_get(id);
+	printf("%s\n", button_state_label[state]);
+	return ((state == BUTTON_STATE_PRESSED) ? 0 : 1);
+}
+
+U_BOOT_CMD(
+	button, 2, 1, do_button,
+	"manage buttons",
+	"list            Show a list of buttons\n"
+	"button <button_label>  Get button state"
+);