dm: test: Add a test for the LED uclass

Add a test to confirm that we can adjust LEDs using the led_gpio driver.

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

arch/sandbox/dts/test.dts

@@ -180,6 +180,20 @@
 		};
 	};
 
+	leds {
+		compatible = "gpio-leds";
+
+		iracibble {
+			gpios = <&gpio_a 1 0>;
+			label = "sandbox:red";
+		};
+
+		martinet {
+			gpios = <&gpio_a 2 0>;
+			label = "sandbox:green";
+		};
+	};
+
 	mmc {
 		compatible = "sandbox,mmc";
 	};

configs/sandbox_defconfig

@@ -49,3 +49,5 @@ CONFIG_CLK=y
 CONFIG_RESET=y
 CONFIG_RAM=y
 CONFIG_DM_MMC=y
+CONFIG_LED=y
+CONFIG_LED_GPIO=y

drivers/led/led_gpio.c

@@ -41,10 +41,16 @@ static int led_gpio_probe(struct udevice *dev)
 
 static int led_gpio_remove(struct udevice *dev)
 {
+	/*
+	 * The GPIO driver may have already been removed. We will need to
+	 * address this more generally.
+	 */
+#ifndef CONFIG_SANDBOX
 	struct led_gpio_priv *priv = dev_get_priv(dev);
 
 	if (dm_gpio_is_valid(&priv->gpio))
 		dm_gpio_free(dev, &priv->gpio);
+#endif
 
 	return 0;
 }

test/dm/Makefile

@@ -19,6 +19,7 @@ obj-$(CONFIG_CLK) += clk.o
 obj-$(CONFIG_DM_ETH) += eth.o
 obj-$(CONFIG_DM_GPIO) += gpio.o
 obj-$(CONFIG_DM_I2C) += i2c.o
+obj-$(CONFIG_LED) += led.o
 obj-$(CONFIG_DM_MMC) += mmc.o
 obj-$(CONFIG_DM_PCI) += pci.o
 obj-$(CONFIG_RAM) += ram.o

test/dm/led.c

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2015 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <led.h>
+#include <asm/gpio.h>
+#include <dm/test.h>
+#include <test/ut.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Base test of the led uclass */
+static int dm_test_led_base(struct unit_test_state *uts)
+{
+	struct udevice *dev;
+
+	/* Get the top-level device */
+	ut_assertok(uclass_get_device(UCLASS_LED, 0, &dev));
+	ut_assertok(uclass_get_device(UCLASS_LED, 1, &dev));
+	ut_assertok(uclass_get_device(UCLASS_LED, 2, &dev));
+	ut_asserteq(-ENODEV, uclass_get_device(UCLASS_LED, 3, &dev));
+
+	return 0;
+}
+DM_TEST(dm_test_led_base, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Test of the led uclass using the led_gpio driver */
+static int dm_test_led_gpio(struct unit_test_state *uts)
+{
+	const int offset = 1;
+	struct udevice *dev, *gpio;
+
+	/*
+	 * Check that we can manipulate an LED. LED 1 is connected to GPIO
+	 * bank gpio_a, offset 1.
+	 */
+	ut_assertok(uclass_get_device(UCLASS_LED, 1, &dev));
+	ut_assertok(uclass_get_device(UCLASS_GPIO, 1, &gpio));
+	ut_asserteq(0, sandbox_gpio_get_value(gpio, offset));
+	led_set_on(dev, 1);
+	ut_asserteq(1, sandbox_gpio_get_value(gpio, offset));
+	led_set_on(dev, 0);
+	ut_asserteq(0, sandbox_gpio_get_value(gpio, offset));
+
+	return 0;
+}
+DM_TEST(dm_test_led_gpio, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Test obtaining an LED by label */
+static int dm_test_led_label(struct unit_test_state *uts)
+{
+	struct udevice *dev, *cmp;
+
+	ut_assertok(led_get_by_label("sandbox:red", &dev));
+	ut_asserteq(1, device_active(dev));
+	ut_assertok(uclass_get_device(UCLASS_LED, 1, &cmp));
+	ut_asserteq_ptr(dev, cmp);
+
+	ut_assertok(led_get_by_label("sandbox:green", &dev));
+	ut_asserteq(1, device_active(dev));
+	ut_assertok(uclass_get_device(UCLASS_LED, 2, &cmp));
+	ut_asserteq_ptr(dev, cmp);
+
+	ut_asserteq(-ENODEV, led_get_by_label("sandbox:blue", &dev));
+
+	return 0;
+}
+DM_TEST(dm_test_led_label, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);