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authorStephen Rothwell <sfr@canb.auug.org.au>2019-01-18 12:32:07 +1100
committerStephen Rothwell <sfr@canb.auug.org.au>2019-01-18 12:32:07 +1100
commit5388a9ee456fdd23a2640369ca4f1658872fce75 (patch)
tree817742459d903be40a437bb9b01e3b51c2fc4904
parenta50834faa59f6722ebf912a7c039872ed1b2ed32 (diff)
parent0f85e8498a482cbfdab91fb2d1b81c6c8c1cfd15 (diff)
download96b-common-5388a9ee456fdd23a2640369ca4f1658872fce75.tar.gz
Merge remote-tracking branch 'leds/for-next'
-rw-r--r--Documentation/ABI/testing/sysfs-class-led-trigger-pattern51
-rw-r--r--Documentation/devicetree/bindings/leds/common.txt12
-rw-r--r--Documentation/devicetree/bindings/leds/leds-trigger-pattern.txt49
-rw-r--r--drivers/leds/led-core.c30
-rw-r--r--drivers/leds/trigger/ledtrig-oneshot.c38
-rw-r--r--drivers/leds/trigger/ledtrig-pattern.c99
-rw-r--r--drivers/leds/trigger/ledtrig-timer.c34
-rw-r--r--include/linux/leds.h13
8 files changed, 257 insertions, 69 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-led-trigger-pattern b/Documentation/ABI/testing/sysfs-class-led-trigger-pattern
index 1e5d172e0646..bd92ef9d6faa 100644
--- a/Documentation/ABI/testing/sysfs-class-led-trigger-pattern
+++ b/Documentation/ABI/testing/sysfs-class-led-trigger-pattern
@@ -7,55 +7,10 @@ Description:
timer. It can do gradual dimming and step change of brightness.
The pattern is given by a series of tuples, of brightness and
- duration (ms). The LED is expected to traverse the series and
- each brightness value for the specified duration. Duration of
- 0 means brightness should immediately change to new value, and
- writing malformed pattern deactivates any active one.
+ duration (ms).
- 1. For gradual dimming, the dimming interval now is set as 50
- milliseconds. So the tuple with duration less than dimming
- interval (50ms) is treated as a step change of brightness,
- i.e. the subsequent brightness will be applied without adding
- intervening dimming intervals.
-
- The gradual dimming format of the software pattern values should be:
- "brightness_1 duration_1 brightness_2 duration_2 brightness_3
- duration_3 ...". For example:
-
- echo 0 1000 255 2000 > pattern
-
- It will make the LED go gradually from zero-intensity to max (255)
- intensity in 1000 milliseconds, then back to zero intensity in 2000
- milliseconds:
-
- LED brightness
- ^
- 255-| / \ / \ /
- | / \ / \ /
- | / \ / \ /
- | / \ / \ /
- 0-| / \/ \/
- +---0----1----2----3----4----5----6------------> time (s)
-
- 2. To make the LED go instantly from one brightness value to another,
- we should use zero-time lengths (the brightness must be same as
- the previous tuple's). So the format should be:
- "brightness_1 duration_1 brightness_1 0 brightness_2 duration_2
- brightness_2 0 ...". For example:
-
- echo 0 1000 0 0 255 2000 255 0 > pattern
-
- It will make the LED stay off for one second, then stay at max brightness
- for two seconds:
-
- LED brightness
- ^
- 255-| +---------+ +---------+
- | | | | |
- | | | | |
- | | | | |
- 0-| -----+ +----+ +----
- +---0----1----2----3----4----5----6------------> time (s)
+ The exact format is described in:
+ Documentation/devicetree/bindings/leds/leds-trigger-pattern.txt
What: /sys/class/leds/<led>/hw_pattern
Date: September 2018
diff --git a/Documentation/devicetree/bindings/leds/common.txt b/Documentation/devicetree/bindings/leds/common.txt
index aa1399814a2a..70876ac11367 100644
--- a/Documentation/devicetree/bindings/leds/common.txt
+++ b/Documentation/devicetree/bindings/leds/common.txt
@@ -37,6 +37,18 @@ Optional properties for child nodes:
"ide-disk" - LED indicates IDE disk activity (deprecated),
in new implementations use "disk-activity"
"timer" - LED flashes at a fixed, configurable rate
+ "pattern" - LED alters the brightness for the specified duration with one
+ software timer (requires "led-pattern" property)
+
+- led-pattern : Array of integers with default pattern for certain triggers.
+ Each trigger may parse this property differently:
+ - one-shot : two numbers specifying delay on and delay off (in ms),
+ - timer : two numbers specifying delay on and delay off (in ms),
+ - pattern : the pattern is given by a series of tuples, of
+ brightness and duration (in ms). The exact format is
+ described in:
+ Documentation/devicetree/bindings/leds/leds-trigger-pattern.txt
+
- led-max-microamp : Maximum LED supply current in microamperes. This property
can be made mandatory for the board configurations
diff --git a/Documentation/devicetree/bindings/leds/leds-trigger-pattern.txt b/Documentation/devicetree/bindings/leds/leds-trigger-pattern.txt
new file mode 100644
index 000000000000..d3696680bfc8
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-trigger-pattern.txt
@@ -0,0 +1,49 @@
+* Pattern format for LED pattern trigger
+
+The pattern is given by a series of tuples, of brightness and duration (ms).
+The LED is expected to traverse the series and each brightness value for the
+specified duration. Duration of 0 means brightness should immediately change to
+new value, and writing malformed pattern deactivates any active one.
+
+1. For gradual dimming, the dimming interval now is set as 50 milliseconds. So
+the tuple with duration less than dimming interval (50ms) is treated as a step
+change of brightness, i.e. the subsequent brightness will be applied without
+adding intervening dimming intervals.
+
+The gradual dimming format of the software pattern values should be:
+"brightness_1 duration_1 brightness_2 duration_2 brightness_3 duration_3 ...".
+For example (using sysfs interface):
+
+echo 0 1000 255 2000 > pattern
+
+It will make the LED go gradually from zero-intensity to max (255) intensity in
+1000 milliseconds, then back to zero intensity in 2000 milliseconds:
+
+LED brightness
+ ^
+255-| / \ / \ /
+ | / \ / \ /
+ | / \ / \ /
+ | / \ / \ /
+ 0-| / \/ \/
+ +---0----1----2----3----4----5----6------------> time (s)
+
+2. To make the LED go instantly from one brightness value to another, we should
+use zero-time lengths (the brightness must be same as the previous tuple's). So
+the format should be: "brightness_1 duration_1 brightness_1 0 brightness_2
+duration_2 brightness_2 0 ...".
+For example (using sysfs interface):
+
+echo 0 1000 0 0 255 2000 255 0 > pattern
+
+It will make the LED stay off for one second, then stay at max brightness for
+two seconds:
+
+LED brightness
+ ^
+255-| +---------+ +---------+
+ | | | | |
+ | | | | |
+ | | | | |
+ 0-| -----+ +----+ +----
+ +---0----1----2----3----4----5----6------------> time (s)
diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
index ede4fa0ac2cc..e3da7c03da1b 100644
--- a/drivers/leds/led-core.c
+++ b/drivers/leds/led-core.c
@@ -16,7 +16,9 @@
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
+#include <linux/of.h>
#include <linux/rwsem.h>
+#include <linux/slab.h>
#include "leds.h"
DECLARE_RWSEM(leds_list_lock);
@@ -310,6 +312,34 @@ int led_update_brightness(struct led_classdev *led_cdev)
}
EXPORT_SYMBOL_GPL(led_update_brightness);
+u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size)
+{
+ struct device_node *np = dev_of_node(led_cdev->dev);
+ u32 *pattern;
+ int count;
+
+ if (!np)
+ return NULL;
+
+ count = of_property_count_u32_elems(np, "led-pattern");
+ if (count < 0)
+ return NULL;
+
+ pattern = kcalloc(count, sizeof(*pattern), GFP_KERNEL);
+ if (!pattern)
+ return NULL;
+
+ if (of_property_read_u32_array(np, "led-pattern", pattern, count)) {
+ kfree(pattern);
+ return NULL;
+ }
+
+ *size = count;
+
+ return pattern;
+}
+EXPORT_SYMBOL_GPL(led_get_default_pattern);
+
/* Caller must ensure led_cdev->led_access held */
void led_sysfs_disable(struct led_classdev *led_cdev)
{
diff --git a/drivers/leds/trigger/ledtrig-oneshot.c b/drivers/leds/trigger/ledtrig-oneshot.c
index 95c9be4b6e7e..8808f0ad7339 100644
--- a/drivers/leds/trigger/ledtrig-oneshot.c
+++ b/drivers/leds/trigger/ledtrig-oneshot.c
@@ -130,6 +130,34 @@ static struct attribute *oneshot_trig_attrs[] = {
};
ATTRIBUTE_GROUPS(oneshot_trig);
+static void pattern_init(struct led_classdev *led_cdev)
+{
+ u32 *pattern;
+ unsigned int size = 0;
+
+ pattern = led_get_default_pattern(led_cdev, &size);
+ if (!pattern)
+ goto out_default;
+
+ if (size != 2) {
+ dev_warn(led_cdev->dev,
+ "Expected 2 but got %u values for delays pattern\n",
+ size);
+ goto out_default;
+ }
+
+ led_cdev->blink_delay_on = pattern[0];
+ led_cdev->blink_delay_off = pattern[1];
+ kfree(pattern);
+
+ return;
+
+out_default:
+ kfree(pattern);
+ led_cdev->blink_delay_on = DEFAULT_DELAY;
+ led_cdev->blink_delay_off = DEFAULT_DELAY;
+}
+
static int oneshot_trig_activate(struct led_classdev *led_cdev)
{
struct oneshot_trig_data *oneshot_data;
@@ -140,8 +168,14 @@ static int oneshot_trig_activate(struct led_classdev *led_cdev)
led_set_trigger_data(led_cdev, oneshot_data);
- led_cdev->blink_delay_on = DEFAULT_DELAY;
- led_cdev->blink_delay_off = DEFAULT_DELAY;
+ if (led_cdev->flags & LED_INIT_DEFAULT_TRIGGER) {
+ pattern_init(led_cdev);
+ /*
+ * Mark as initialized even on pattern_init() error because
+ * any consecutive call to it would produce the same error.
+ */
+ led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER;
+ }
return 0;
}
diff --git a/drivers/leds/trigger/ledtrig-pattern.c b/drivers/leds/trigger/ledtrig-pattern.c
index 1870cf87afe1..718729c89440 100644
--- a/drivers/leds/trigger/ledtrig-pattern.c
+++ b/drivers/leds/trigger/ledtrig-pattern.c
@@ -220,22 +220,10 @@ out:
return count;
}
-static ssize_t pattern_trig_store_patterns(struct led_classdev *led_cdev,
- const char *buf, size_t count,
- bool hw_pattern)
+static int pattern_trig_store_patterns_string(struct pattern_trig_data *data,
+ const char *buf, size_t count)
{
- struct pattern_trig_data *data = led_cdev->trigger_data;
- int ccount, cr, offset = 0, err = 0;
-
- mutex_lock(&data->lock);
-
- del_timer_sync(&data->timer);
-
- if (data->is_hw_pattern)
- led_cdev->pattern_clear(led_cdev);
-
- data->is_hw_pattern = hw_pattern;
- data->npatterns = 0;
+ int ccount, cr, offset = 0;
while (offset < count - 1 && data->npatterns < MAX_PATTERNS) {
cr = 0;
@@ -244,14 +232,54 @@ static ssize_t pattern_trig_store_patterns(struct led_classdev *led_cdev,
&data->patterns[data->npatterns].delta_t, &cr);
if (ccount != 2) {
data->npatterns = 0;
- err = -EINVAL;
- goto out;
+ return -EINVAL;
}
offset += cr;
data->npatterns++;
}
+ return 0;
+}
+
+static int pattern_trig_store_patterns_int(struct pattern_trig_data *data,
+ const u32 *buf, size_t count)
+{
+ unsigned int i;
+
+ for (i = 0; i < count; i += 2) {
+ data->patterns[data->npatterns].brightness = buf[i];
+ data->patterns[data->npatterns].delta_t = buf[i + 1];
+ data->npatterns++;
+ }
+
+ return 0;
+}
+
+static ssize_t pattern_trig_store_patterns(struct led_classdev *led_cdev,
+ const char *buf, const u32 *buf_int,
+ size_t count, bool hw_pattern)
+{
+ struct pattern_trig_data *data = led_cdev->trigger_data;
+ int err = 0;
+
+ mutex_lock(&data->lock);
+
+ del_timer_sync(&data->timer);
+
+ if (data->is_hw_pattern)
+ led_cdev->pattern_clear(led_cdev);
+
+ data->is_hw_pattern = hw_pattern;
+ data->npatterns = 0;
+
+ if (buf)
+ err = pattern_trig_store_patterns_string(data, buf, count);
+ else
+ err = pattern_trig_store_patterns_int(data, buf_int, count);
+ if (err)
+ goto out;
+
err = pattern_trig_start_pattern(led_cdev);
if (err)
data->npatterns = 0;
@@ -275,7 +303,7 @@ static ssize_t pattern_store(struct device *dev, struct device_attribute *attr,
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
- return pattern_trig_store_patterns(led_cdev, buf, count, false);
+ return pattern_trig_store_patterns(led_cdev, buf, NULL, count, false);
}
static DEVICE_ATTR_RW(pattern);
@@ -295,7 +323,7 @@ static ssize_t hw_pattern_store(struct device *dev,
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
- return pattern_trig_store_patterns(led_cdev, buf, count, true);
+ return pattern_trig_store_patterns(led_cdev, buf, NULL, count, true);
}
static DEVICE_ATTR_RW(hw_pattern);
@@ -331,6 +359,30 @@ static const struct attribute_group *pattern_trig_groups[] = {
NULL,
};
+static void pattern_init(struct led_classdev *led_cdev)
+{
+ unsigned int size = 0;
+ u32 *pattern;
+ int err;
+
+ pattern = led_get_default_pattern(led_cdev, &size);
+ if (!pattern)
+ return;
+
+ if (size % 2) {
+ dev_warn(led_cdev->dev, "Expected pattern of tuples\n");
+ goto out;
+ }
+
+ err = pattern_trig_store_patterns(led_cdev, NULL, pattern, size, false);
+ if (err < 0)
+ dev_warn(led_cdev->dev,
+ "Pattern initialization failed with error %d\n", err);
+
+out:
+ kfree(pattern);
+}
+
static int pattern_trig_activate(struct led_classdev *led_cdev)
{
struct pattern_trig_data *data;
@@ -354,6 +406,15 @@ static int pattern_trig_activate(struct led_classdev *led_cdev)
timer_setup(&data->timer, pattern_trig_timer_function, 0);
led_cdev->activated = true;
+ if (led_cdev->flags & LED_INIT_DEFAULT_TRIGGER) {
+ pattern_init(led_cdev);
+ /*
+ * Mark as initialized even on pattern_init() error because
+ * any consecutive call to it would produce the same error.
+ */
+ led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER;
+ }
+
return 0;
}
diff --git a/drivers/leds/trigger/ledtrig-timer.c b/drivers/leds/trigger/ledtrig-timer.c
index 7c14983781ee..ca898c1383be 100644
--- a/drivers/leds/trigger/ledtrig-timer.c
+++ b/drivers/leds/trigger/ledtrig-timer.c
@@ -15,6 +15,7 @@
#include <linux/init.h>
#include <linux/device.h>
#include <linux/ctype.h>
+#include <linux/slab.h>
#include <linux/leds.h>
static ssize_t led_delay_on_show(struct device *dev,
@@ -77,8 +78,41 @@ static struct attribute *timer_trig_attrs[] = {
};
ATTRIBUTE_GROUPS(timer_trig);
+static void pattern_init(struct led_classdev *led_cdev)
+{
+ u32 *pattern;
+ unsigned int size = 0;
+
+ pattern = led_get_default_pattern(led_cdev, &size);
+ if (!pattern)
+ return;
+
+ if (size != 2) {
+ dev_warn(led_cdev->dev,
+ "Expected 2 but got %u values for delays pattern\n",
+ size);
+ goto out;
+ }
+
+ led_cdev->blink_delay_on = pattern[0];
+ led_cdev->blink_delay_off = pattern[1];
+ /* led_blink_set() called by caller */
+
+out:
+ kfree(pattern);
+}
+
static int timer_trig_activate(struct led_classdev *led_cdev)
{
+ if (led_cdev->flags & LED_INIT_DEFAULT_TRIGGER) {
+ pattern_init(led_cdev);
+ /*
+ * Mark as initialized even on pattern_init() error because
+ * any consecutive call to it would produce the same error.
+ */
+ led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER;
+ }
+
led_blink_set(led_cdev, &led_cdev->blink_delay_on,
&led_cdev->blink_delay_off);
diff --git a/include/linux/leds.h b/include/linux/leds.h
index 5263f87e1d2c..78204650fe2a 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -219,6 +219,19 @@ extern int led_set_brightness_sync(struct led_classdev *led_cdev,
extern int led_update_brightness(struct led_classdev *led_cdev);
/**
+ * led_get_default_pattern - return default pattern
+ *
+ * @led_cdev: the LED to get default pattern for
+ * @size: pointer for storing the number of elements in returned array,
+ * modified only if return != NULL
+ *
+ * Return: Allocated array of integers with default pattern from device tree
+ * or NULL. Caller is responsible for kfree().
+ */
+extern u32 *led_get_default_pattern(struct led_classdev *led_cdev,
+ unsigned int *size);
+
+/**
* led_sysfs_disable - disable LED sysfs interface
* @led_cdev: the LED to set
*