diff options
author | Nikolaus Voss | 2019-06-12 10:36:08 +0200 |
---|---|---|
committer | Thierry Reding | 2019-06-26 11:39:12 +0200 |
commit | 3f467ebe9e898c6ceec5334d92bccac2bd9bc7d2 (patch) | |
tree | e9526ac6466929555e0f767b2de0a5869e4d353b /drivers/leds | |
parent | 4a6ef8e37c4d9a40f09438068da1734fd965bd75 (diff) |
leds: pwm: Support ACPI via firmware-node framework
DT specific handling is replaced by firmware-node abstration to support
ACPI specification of PWM LEDS.
Example ASL:
Device (PWML)
{
Name (_HID, "PRP0001")
Name (_DSD, Package () {
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package () { Package () {"compatible",
Package () {"pwm-leds"}}}})
Device (PWL0)
{
Name (_HID, "PRP0001")
Name (_DSD, Package () {
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package () {
Package () {"label", "alarm-led"},
Package () {"pwms", Package ()
{\_SB_.PCI0.PWM, 0, 600000, 0}},
Package () {"linux,default-state", "off"}}})
}
}
Signed-off-by: Nikolaus Voss <nikolaus.voss@loewensteinmedical.de>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/leds')
-rw-r--r-- | drivers/leds/leds-pwm.c | 45 |
1 files changed, 27 insertions, 18 deletions
diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c index af08bcdc4fd8..3ce4d53c0cc9 100644 --- a/drivers/leds/leds-pwm.c +++ b/drivers/leds/leds-pwm.c @@ -75,7 +75,7 @@ static inline size_t sizeof_pwm_leds_priv(int num_leds) } static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv, - struct led_pwm *led, struct device_node *child) + struct led_pwm *led, struct fwnode_handle *fwnode) { struct led_pwm_data *led_data = &priv->leds[priv->num_leds]; struct pwm_args pargs; @@ -88,8 +88,8 @@ static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv, led_data->cdev.max_brightness = led->max_brightness; led_data->cdev.flags = LED_CORE_SUSPENDRESUME; - if (child) - led_data->pwm = devm_of_pwm_get(dev, child, NULL); + if (fwnode) + led_data->pwm = devm_fwnode_pwm_get(dev, fwnode, NULL); else led_data->pwm = devm_pwm_get(dev, led->name); if (IS_ERR(led_data->pwm)) { @@ -114,7 +114,8 @@ static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv, if (!led_data->period && (led->pwm_period_ns > 0)) led_data->period = led->pwm_period_ns; - ret = devm_of_led_classdev_register(dev, child, &led_data->cdev); + ret = devm_of_led_classdev_register(dev, to_of_node(fwnode), + &led_data->cdev); if (ret == 0) { priv->num_leds++; led_pwm_set(&led_data->cdev, led_data->cdev.brightness); @@ -126,27 +127,35 @@ static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv, return ret; } -static int led_pwm_create_of(struct device *dev, struct led_pwm_priv *priv) +static int led_pwm_create_fwnode(struct device *dev, struct led_pwm_priv *priv) { - struct device_node *child; + struct fwnode_handle *fwnode; struct led_pwm led; int ret = 0; memset(&led, 0, sizeof(led)); - for_each_child_of_node(dev->of_node, child) { - led.name = of_get_property(child, "label", NULL) ? : - child->name; + device_for_each_child_node(dev, fwnode) { + ret = fwnode_property_read_string(fwnode, "label", &led.name); + if (ret && is_of_node(fwnode)) + led.name = to_of_node(fwnode)->name; - led.default_trigger = of_get_property(child, - "linux,default-trigger", NULL); - led.active_low = of_property_read_bool(child, "active-low"); - of_property_read_u32(child, "max-brightness", - &led.max_brightness); + if (!led.name) { + fwnode_handle_put(fwnode); + return -EINVAL; + } + + fwnode_property_read_string(fwnode, "linux,default-trigger", + &led.default_trigger); + + led.active_low = fwnode_property_read_bool(fwnode, + "active-low"); + fwnode_property_read_u32(fwnode, "max-brightness", + &led.max_brightness); - ret = led_pwm_add(dev, priv, &led, child); + ret = led_pwm_add(dev, priv, &led, fwnode); if (ret) { - of_node_put(child); + fwnode_handle_put(fwnode); break; } } @@ -164,7 +173,7 @@ static int led_pwm_probe(struct platform_device *pdev) if (pdata) count = pdata->num_leds; else - count = of_get_child_count(pdev->dev.of_node); + count = device_get_child_node_count(&pdev->dev); if (!count) return -EINVAL; @@ -182,7 +191,7 @@ static int led_pwm_probe(struct platform_device *pdev) break; } } else { - ret = led_pwm_create_of(&pdev->dev, priv); + ret = led_pwm_create_fwnode(&pdev->dev, priv); } if (ret) |