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dm: led: Add support for getting the state of an LED

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It is useful to be able to read the LED as well as write it. Add this to
the uclass and update the GPIO driver.

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 11:34:55 -06:00
parent ddae9fcddc
commit 8f4b612333
4 changed files with 50 additions and 0 deletions
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10
drivers/led/led-uclass.c
View File

@ -42,6 +42,16 @@ int led_set_state(struct udevice *dev, enum led_state_t state)
return ops->set_state(dev, state);
}
enum led_state_t led_get_state(struct udevice *dev)
{
struct led_ops *ops = led_get_ops(dev);
if (!ops->get_state)
return -ENOSYS;
return ops->get_state(dev);
}
UCLASS_DRIVER(led) = {
.id = UCLASS_LED,
.name = "led",

22
drivers/led/led_gpio.c
View File

@ -24,10 +24,31 @@ static int gpio_led_set_state(struct udevice *dev, enum led_state_t state)
if (!dm_gpio_is_valid(&priv->gpio))
return -EREMOTEIO;
switch (state) {
case LEDST_OFF:
case LEDST_ON:
break;
default:
return -ENOSYS;
}
return dm_gpio_set_value(&priv->gpio, state);
}
static enum led_state_t gpio_led_get_state(struct udevice *dev)
{
struct led_gpio_priv *priv = dev_get_priv(dev);
int ret;
if (!dm_gpio_is_valid(&priv->gpio))
return -EREMOTEIO;
ret = dm_gpio_get_value(&priv->gpio);
if (ret < 0)
return ret;
return ret ? LEDST_ON : LEDST_OFF;
}
static int led_gpio_probe(struct udevice *dev)
{
struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
@ -88,6 +109,7 @@ static int led_gpio_bind(struct udevice *parent)
static const struct led_ops gpio_led_ops = {
.set_state = gpio_led_set_state,
.get_state = gpio_led_get_state,
};
static const struct udevice_id led_gpio_ids[] = {

16
include/led.h
View File

@ -33,6 +33,14 @@ struct led_ops {
* @return 0 if OK, -ve on error
*/
int (*set_state)(struct udevice *dev, enum led_state_t state);
/**
* led_get_state() - get the state of an LED
*
* @dev: LED device to change
* @return LED state led_state_t, or -ve on error
*/
enum led_state_t (*get_state)(struct udevice *dev);
};
#define led_get_ops(dev) ((struct led_ops *)(dev)->driver->ops)
@ -55,4 +63,12 @@ int led_get_by_label(const char *label, struct udevice **devp);
*/
int led_set_state(struct udevice *dev, enum led_state_t state);
/**
* led_get_state() - get the state of an LED
*
* @dev: LED device to change
* @return LED state led_state_t, or -ve on error
*/
enum led_state_t led_get_state(struct udevice *dev);
#endif

2
test/dm/led.c
View File

@ -43,9 +43,11 @@ static int dm_test_led_gpio(struct unit_test_state *uts)
ut_asserteq(0, sandbox_gpio_get_value(gpio, offset));
ut_assertok(led_set_state(dev, LEDST_ON));
ut_asserteq(1, sandbox_gpio_get_value(gpio, offset));
ut_asserteq(LEDST_ON, led_get_state(dev));
ut_assertok(led_set_state(dev, LEDST_OFF));
ut_asserteq(0, sandbox_gpio_get_value(gpio, offset));
ut_asserteq(LEDST_OFF, led_get_state(dev));
return 0;
}