Recall that on Turris Omnia, the LED controller has a global brightness
property, which allows the user to make the front LED panel dimmer.
There is also a button on the front panel, which by default is
configured so that pressing it changes the global brightness to a lower
value (unless it is at 0%, in which case pressing the button changes the
global brightness to 100%).
Newer versions of the MCU firmware support informing the SOC that the
brightness was changed by button press event via an interrupt.
Now that we have the turris-omnia-mcu driver, which adds support for MCU
interrupts, add the ability to inform the userspace (via a sysfs
notification) that the global brightness was changed.
Signed-off-by: Marek Behún <kabel@xxxxxxxxxx>
---
drivers/leds/leds-turris-omnia.c | 67 ++++++++++++++++++++++++++++++--
1 file changed, 64 insertions(+), 3 deletions(-)
diff --git a/drivers/leds/leds-turris-omnia.c b/drivers/leds/leds-turris-omnia.c
index 14e8fbb5bb69..bf8635cec72e 100644
--- a/drivers/leds/leds-turris-omnia.c
+++ b/drivers/leds/leds-turris-omnia.c
@@ -357,7 +357,57 @@ static struct attribute *omnia_led_controller_attrs[] = {
&dev_attr_gamma_correction.attr,
NULL,
};
-ATTRIBUTE_GROUPS(omnia_led_controller);
+
+static const struct attribute_group omnia_led_controller_group = {
+ .attrs = omnia_led_controller_attrs,
+};
+
+static irqreturn_t omnia_brightness_changed_handler(int irq, void *dev_id)
+{
+ struct kernfs_node *brightness_kn = dev_id;
+
+ sysfs_notify_dirent(brightness_kn);
+
+ return IRQ_HANDLED;
+}
+
+static void brightness_kn_release(struct device *dev, void *res)
+{
+ struct kernfs_node **brightness_kn = res;
+
+ sysfs_put(*brightness_kn);
+}
+
+static int omnia_probe_brightness_interrupt(struct i2c_client *client)
+{
+ struct kernfs_node **brightness_kn;
+ struct device *dev = &client->dev;
+ int ret;
+
+ brightness_kn = devres_alloc(brightness_kn_release,
+ sizeof(*brightness_kn), GFP_KERNEL);
+ if (!brightness_kn)
+ return -ENOMEM;
+
+ *brightness_kn = sysfs_get_dirent(dev->kobj.sd, "brightness");
+ if (!*brightness_kn) {
+ devres_free(brightness_kn);
+ return -EIO;
+ }
+
+ devres_add(dev, brightness_kn);
+
+ ret = devm_request_any_context_irq(dev, client->irq,
+ omnia_brightness_changed_handler,
+ IRQF_ONESHOT, "leds-turris-omnia",
+ *brightness_kn);
+ if (ret < 0) {
+ dev_err(dev, "Cannot request IRQ: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
static int omnia_mcu_get_features(const struct i2c_client *client)
{
@@ -387,6 +437,7 @@ static int omnia_leds_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct device_node *np = dev_of_node(dev);
+ bool has_brightness_interrupt;
struct omnia_leds *leds;
struct omnia_led *led;
int ret, count;
@@ -414,6 +465,8 @@ static int omnia_leds_probe(struct i2c_client *client)
return ret;
}
+ has_brightness_interrupt = ret & OMNIA_FEAT_BRIGHTNESS_INT;
+
leds->has_gamma_correction = ret & OMNIA_FEAT_LED_GAMMA_CORRECTION;
if (!leds->has_gamma_correction) {
dev_info(dev,
@@ -439,7 +492,16 @@ static int omnia_leds_probe(struct i2c_client *client)
led += ret;
}
- return 0;
+ ret = devm_device_add_group(dev, &omnia_led_controller_group);
+ if (ret < 0) {
+ dev_err(dev, "Cannot add sysfs attribute group: %d\n", ret);
+ return ret;
+ }
+
+ if (has_brightness_interrupt)
+ ret = omnia_probe_brightness_interrupt(client);
+
+ return ret;
}
static void omnia_leds_remove(struct i2c_client *client)
@@ -479,7 +541,6 @@ static struct i2c_driver omnia_leds_driver = {
.driver = {
.name = "leds-turris-omnia",
.of_match_table = of_omnia_leds_match,
- .dev_groups = omnia_led_controller_groups,
},
};
--
2.44.2
