[PATCH v7 09/11] leds: trigger: netdev: add additional hardware only triggers

Christian Marangi
2022-12-15T00:01:11Z

Add additional hardware only triggers commonly supported by switch LEDs.

Additional modes:
link_10: LED on with link up AND speed 10mbps
link_100: LED on with link up AND speed 100mbps
link_1000: LED on with link up AND speed 1000mbps
half_duplex: LED on with link up AND half_duplex mode
full_duplex: LED on with link up AND full duplex mode

Additional blink interval modes:
blink_2hz: LED blink on any even at 2Hz (250ms)
blink_4hz: LED blink on any even at 4Hz (125ms)
blink_8hz: LED blink on any even at 8Hz (62ms)

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
drivers/leds/trigger/ledtrig-netdev.c | 58 +++++++++++++++++++++++++++
include/linux/leds.h | 10 +++++
2 files changed, 68 insertions(+)

diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c
index 3a3b77bb41fb..880d5e65f7a2 100644
--- a/drivers/leds/trigger/ledtrig-netdev.c
+++ b/drivers/leds/trigger/ledtrig-netdev.c
@@ -29,8 +29,20 @@
*
* device_name - network device name to monitor
* interval - duration of LED blink, in milliseconds
+ * (in hardware mode 2hz (62ms), 4hz (125ms) or 8hz (250ms)
+ * are supported)
* link - LED's normal state reflects whether the link is up
* (has carrier) or not
+ * link_10 - LED's normal state reflects whether the link is
+ * up and at 10mbps speed (hardware only)
+ * link_100 - LED's normal state reflects whether the link is
+ * up and at 100mbps speed (hardware only)
+ * link_1000 - LED's normal state reflects whether the link is
+ * up and at 1000mbps speed (hardware only)
+ * half_duplex - LED's normal state reflects whether the link is
+ * up and hafl duplex (hardware only)
+ * full_duplex - LED's normal state reflects whether the link is
+ * up and full duplex (hardware only)
* tx - LED blinks on transmitted data
* rx - LED blinks on receive data
* available_mode - Display available mode and how they can be handled
@@ -64,8 +76,19 @@ struct netdev_led_attr_detail {

static struct netdev_led_attr_detail attr_details[] = {
{ .name = "link", .bit = TRIGGER_NETDEV_LINK},
+ { .name = "link_10", .hardware_only = true, .bit = TRIGGER_NETDEV_LINK_10},
+ { .name = "link_100", .hardware_only = true, .bit = TRIGGER_NETDEV_LINK_100},
+ { .name = "link_1000", .hardware_only = true, .bit = TRIGGER_NETDEV_LINK_1000},
+ { .name = "half_duplex", .hardware_only = true, .bit = TRIGGER_NETDEV_HALF_DUPLEX},
+ { .name = "full_duplex", .hardware_only = true, .bit = TRIGGER_NETDEV_FULL_DUPLEX},
{ .name = "tx", .bit = TRIGGER_NETDEV_TX},
{ .name = "rx", .bit = TRIGGER_NETDEV_RX},
+ { .name = "hw blink 2hz (interval set to 62)", .hardware_only = true,
+ .bit = TRIGGER_NETDEV_BLINK_2HZ},
+ { .name = "hw blink 4hz (interval set to 125)", .hardware_only = true,
+ .bit = TRIGGER_NETDEV_BLINK_4HZ},
+ { .name = "hw blink 8hz (interval set to 250)", .hardware_only = true,
+ .bit = TRIGGER_NETDEV_BLINK_8HZ},
};

static bool validate_baseline_state(struct led_netdev_data *trigger_data)
@@ -259,6 +282,11 @@ static ssize_t netdev_led_attr_show(struct device *dev, char *buf,

switch (attr) {
case TRIGGER_NETDEV_LINK:
+ case TRIGGER_NETDEV_LINK_10:
+ case TRIGGER_NETDEV_LINK_100:
+ case TRIGGER_NETDEV_LINK_1000:
+ case TRIGGER_NETDEV_HALF_DUPLEX:
+ case TRIGGER_NETDEV_FULL_DUPLEX:
case TRIGGER_NETDEV_TX:
case TRIGGER_NETDEV_RX:
bit = attr;
@@ -284,6 +312,11 @@ static ssize_t netdev_led_attr_store(struct device *dev, const char *buf,

switch (attr) {
case TRIGGER_NETDEV_LINK:
+ case TRIGGER_NETDEV_LINK_10:
+ case TRIGGER_NETDEV_LINK_100:
+ case TRIGGER_NETDEV_LINK_1000:
+ case TRIGGER_NETDEV_HALF_DUPLEX:
+ case TRIGGER_NETDEV_FULL_DUPLEX:
case TRIGGER_NETDEV_TX:
case TRIGGER_NETDEV_RX:
bit = attr;
@@ -324,6 +357,11 @@ static ssize_t netdev_led_attr_store(struct device *dev, const char *buf,
static DEVICE_ATTR_RW(trigger_name)

DEFINE_NETDEV_TRIGGER(link, TRIGGER_NETDEV_LINK);
+DEFINE_NETDEV_TRIGGER(link_10, TRIGGER_NETDEV_LINK_10);
+DEFINE_NETDEV_TRIGGER(link_100, TRIGGER_NETDEV_LINK_100);
+DEFINE_NETDEV_TRIGGER(link_1000, TRIGGER_NETDEV_LINK_1000);
+DEFINE_NETDEV_TRIGGER(half_duplex, TRIGGER_NETDEV_HALF_DUPLEX);
+DEFINE_NETDEV_TRIGGER(full_duplex, TRIGGER_NETDEV_FULL_DUPLEX);
DEFINE_NETDEV_TRIGGER(tx, TRIGGER_NETDEV_TX);
DEFINE_NETDEV_TRIGGER(rx, TRIGGER_NETDEV_RX);

@@ -356,6 +394,21 @@ static ssize_t interval_store(struct device *dev,

cancel_delayed_work_sync(&trigger_data->work);

+ if (trigger_data->blink_mode == HARDWARE_CONTROLLED) {
+ /* Interval are handled as triggers. Reset them. */
+ trigger_data->mode &= ~(BIT(TRIGGER_NETDEV_BLINK_8HZ) |
+ BIT(TRIGGER_NETDEV_BLINK_4HZ) |
+ BIT(TRIGGER_NETDEV_BLINK_2HZ));
+
+ /* Support a common value of 2Hz, 4Hz and 8Hz. */
+ if (value > 5 && value <= 62) /* 8Hz */
+ trigger_data->mode |= BIT(TRIGGER_NETDEV_BLINK_8HZ);
+ else if (value > 63 && value <= 125) /* 4Hz */
+ trigger_data->mode |= BIT(TRIGGER_NETDEV_BLINK_4HZ);
+ else /* 2Hz */
+ trigger_data->mode |= BIT(TRIGGER_NETDEV_BLINK_2HZ);
+ }
+
atomic_set(&trigger_data->interval, msecs_to_jiffies(value));

if (!validate_baseline_state(trigger_data)) {
@@ -404,6 +457,11 @@ static DEVICE_ATTR_RO(available_mode);
static struct attribute *netdev_trig_attrs[] = {
&dev_attr_device_name.attr,
&dev_attr_link.attr,
+ &dev_attr_link_10.attr,
+ &dev_attr_link_100.attr,
+ &dev_attr_link_1000.attr,
+ &dev_attr_half_duplex.attr,
+ &dev_attr_full_duplex.attr,
&dev_attr_rx.attr,
&dev_attr_tx.attr,
&dev_attr_interval.attr,
diff --git a/include/linux/leds.h b/include/linux/leds.h
index 13862f8b1e07..5fcc6d233757 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -551,8 +551,18 @@ static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
/* Trigger specific enum */
enum led_trigger_netdev_modes {
TRIGGER_NETDEV_LINK = 1,
+ TRIGGER_NETDEV_LINK_10,
+ TRIGGER_NETDEV_LINK_100,
+ TRIGGER_NETDEV_LINK_1000,
+ TRIGGER_NETDEV_HALF_DUPLEX,
+ TRIGGER_NETDEV_FULL_DUPLEX,
TRIGGER_NETDEV_TX,
TRIGGER_NETDEV_RX,
+
+ /* Hardware Interval options */
+ TRIGGER_NETDEV_BLINK_2HZ,
+ TRIGGER_NETDEV_BLINK_4HZ,
+ TRIGGER_NETDEV_BLINK_8HZ,
};

/* Trigger specific functions */
--
2.37.2