cros_ec: Add support for switches

On x86 platforms the EC provides a way to read 'switches', which are
on/off values determined by the EC.

Add a new driver method for this and implement it for LPC.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/cmd/cros_ec.c b/cmd/cros_ec.c
index 77656a2308..a222c75c17 100644
--- a/cmd/cros_ec.c
+++ b/cmd/cros_ec.c
@@ -162,6 +162,41 @@ static int do_show_features(struct udevice *dev)
 	return 0;
 }
 
+static const char *const switch_name[8] = {
+	"lid open",
+	"power button pressed",
+	"write-protect disabled",
+	NULL,
+	"dedicated recovery",
+	NULL,
+	NULL,
+	NULL,
+};
+
+static int do_show_switches(struct udevice *dev)
+{
+	uint switches;
+	int ret;
+	uint i;
+
+	ret = cros_ec_get_switches(dev);
+	if (ret < 0)
+		return log_msg_ret("get", ret);
+	switches = ret;
+	for (i = 0; i < ARRAY_SIZE(switch_name); i++) {
+		uint mask = 1 << i;
+
+		if (switches & mask) {
+			if (switch_name[i])
+				printf("%s\n", switch_name[i]);
+			else
+				printf("unknown %02x\n", mask);
+		}
+	}
+
+	return 0;
+}
+
 static int do_cros_ec(struct cmd_tbl *cmdtp, int flag, int argc,
 		      char *const argv[])
 {
@@ -213,6 +248,11 @@ static int do_cros_ec(struct cmd_tbl *cmdtp, int flag, int argc,
 
 		if (ret)
 			printf("Error: %d\n", ret);
+	} else if (!strcmp("switches", cmd)) {
+		ret = do_show_switches(dev);
+
+		if (ret)
+			printf("Error: %d\n", ret);
 	} else if (0 == strcmp("curimage", cmd)) {
 		enum ec_current_image image;
 
@@ -453,6 +493,7 @@ U_BOOT_CMD(
 	"crosec id                  Read CROS-EC ID\n"
 	"crosec info                Read CROS-EC info\n"
 	"crosec features            Read CROS-EC features\n"
+	"crosec switches            Read CROS-EC switches\n"
 	"crosec curimage            Read CROS-EC current image\n"
 	"crosec hash                Read CROS-EC hash\n"
 	"crosec reboot [rw | ro | cold]  Reboot CROS-EC\n"