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dm: led: Add support for blinking LEDs

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Allow LEDs to be blinked if the driver supports it. Enable this for
sandbox so that the tests run.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ziping Chen <techping.chan@gmail.com>
This commit is contained in:
Simon Glass 2017-04-10 11:34:57 -06:00
parent 9413ad4f0d
commit 53378dac8d
7 changed files with 83 additions and 0 deletions
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1
configs/sandbox_defconfig
View file

@ -83,6 +83,7 @@ CONFIG_I2C_ARB_GPIO_CHALLENGE=y
CONFIG_CROS_EC_KEYB=y
CONFIG_I8042_KEYB=y
CONFIG_LED=y
CONFIG_LED_BLINK=y
CONFIG_LED_GPIO=y
CONFIG_DM_MAILBOX=y
CONFIG_SANDBOX_MBOX=y

1
configs/sandbox_noblk_defconfig
View file

@ -92,6 +92,7 @@ CONFIG_I2C_ARB_GPIO_CHALLENGE=y
CONFIG_CROS_EC_KEYB=y
CONFIG_I8042_KEYB=y
CONFIG_LED=y
CONFIG_LED_BLINK=y
CONFIG_LED_GPIO=y
CONFIG_CROS_EC=y
CONFIG_CROS_EC_I2C=y

1
configs/sandbox_spl_defconfig
View file

@ -94,6 +94,7 @@ CONFIG_I2C_ARB_GPIO_CHALLENGE=y
CONFIG_CROS_EC_KEYB=y
CONFIG_I8042_KEYB=y
CONFIG_LED=y
CONFIG_LED_BLINK=y
CONFIG_LED_GPIO=y
CONFIG_DM_MAILBOX=y
CONFIG_SANDBOX_MBOX=y

9
drivers/led/Kconfig
View file

@ -9,6 +9,15 @@ config LED
can provide access to board-specific LEDs. Use of the device tree
for configuration is encouraged.
config LED_BLINK
bool "Support LED blinking"
depends on LED
help
Some drivers can support automatic blinking of LEDs with a given
period, without needing timers or extra code to handle the timing.
This option enables support for this which adds slightly to the
code size.
config SPL_LED
bool "Enable LED support in SPL"
depends on SPL && SPL_DM

12
drivers/led/led-uclass.c
View file

@ -52,6 +52,18 @@ enum led_state_t led_get_state(struct udevice *dev)
return ops->get_state(dev);
}
#ifdef CONFIG_LED_BLINK
int led_set_period(struct udevice *dev, int period_ms)
{
struct led_ops *ops = led_get_ops(dev);
if (!ops->set_period)
return -ENOSYS;
return ops->set_period(dev, period_ms);
}
#endif
UCLASS_DRIVER(led) = {
.id = UCLASS_LED,
.name = "led",

35
include/led.h
View file

@ -17,10 +17,22 @@ struct led_uc_plat {
const char *label;
};
/**
* struct led_uc_priv - Private data the uclass stores about each device
*
* @period_ms: Flash period in milliseconds
*/
struct led_uc_priv {
int period_ms;
};
enum led_state_t {
LEDST_OFF = 0,
LEDST_ON = 1,
LEDST_TOGGLE,
#ifdef CONFIG_LED_BLINK
LEDST_BLINK,
#endif
LEDST_COUNT,
};
@ -42,6 +54,20 @@ struct led_ops {
* @return LED state led_state_t, or -ve on error
*/
enum led_state_t (*get_state)(struct udevice *dev);
#ifdef CONFIG_LED_BLINK
/**
* led_set_period() - set the blink period of an LED
*
* Thie records the period if supported, or returns -ENOSYS if not.
* To start the LED blinking, use set_state().
*
* @dev: LED device to change
* @period_ms: LED blink period in milliseconds
* @return 0 if OK, -ve on error
*/
int (*set_period)(struct udevice *dev, int period_ms);
#endif
};
#define led_get_ops(dev) ((struct led_ops *)(dev)->driver->ops)
@ -72,4 +98,13 @@ int led_set_state(struct udevice *dev, enum led_state_t state);
*/
enum led_state_t led_get_state(struct udevice *dev);
/**
* led_set_period() - set the blink period of an LED
*
* @dev: LED device to change
* @period_ms: LED blink period in milliseconds
* @return 0 if OK, -ve on error
*/
int led_set_period(struct udevice *dev, int period_ms);
#endif

24
test/dm/led.c
View file

@ -98,3 +98,27 @@ static int dm_test_led_label(struct unit_test_state *uts)
return 0;
}
DM_TEST(dm_test_led_label, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
/* Test LED blinking */
#ifdef CONFIG_LED_BLINK
static int dm_test_led_blink(struct unit_test_state *uts)
{
const int offset = 1;
struct udevice *dev, *gpio;
/*
* Check that we get an error when trying to blink an LED, since it is
* not supported by the GPIO LED driver.
*/
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));
ut_asserteq(-ENOSYS, led_set_state(dev, LEDST_BLINK));
ut_asserteq(0, sandbox_gpio_get_value(gpio, offset));
ut_asserteq(LEDST_OFF, led_get_state(dev));
ut_asserteq(-ENOSYS, led_set_period(dev, 100));
return 0;
}
DM_TEST(dm_test_led_blink, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
#endif