diff mbox series

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

Message ID 20221214235438.30271-10-ansuelsmth@gmail.com
State New
Headers show
Series [v7,01/11] leds: add support for hardware driven LEDs | expand

Commit Message

Christian Marangi Dec. 14, 2022, 11:54 p.m. UTC 
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(+)

Comments

Christian Marangi Dec. 21, 2022, 12:56 p.m. UTC | #1 
On Wed, Dec 21, 2022 at 01:12:16AM +0100, Andrew Lunn wrote:
> On Thu, Dec 15, 2022 at 05:35:47PM +0000, Russell King (Oracle) wrote:
> > On Thu, Dec 15, 2022 at 12:54:36AM +0100, Christian Marangi wrote:
> > > 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
> > 
> > Looking at Marvell 88e151x, I don't think this is usable there.
> > We have the option of supporting link_1000 on one of the LEDs,
> > link_100 on another, and link_10 on the other. It's rather rare
> > for all three leds to be wired though.
> 
> The 88e151x will need to enumerate what it actually supports from the
> above list, per LED. I also think we can carefully expand the list
> above, adding a few more modes. We just need to ensure what is added
> is reasonably generic, modes we expect multiple PHY to support. What
> we need to avoid is adding every single mode a PHY supports, but no
> other PHY has.
> 
> > This is also a PHY where "activity" mode is supported (illuminated
> > or blinking if any traffic is transmitted or received) but may not
> > support individual directional traffic in hardware. However, it
> > does support forcing the LED on or off, so software mode can handle
> > those until the user selects a combination of modes that are
> > supported in the hardware.
> > 
> > > 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)
> > 
> > This seems too restrictive. For example, Marvell 88e151x supports
> > none of these, but does support 42, 84, 170, 340, 670ms.
> 
> I would actually drop this whole idea of being able to configure the
> blink period. It seems like it is going to cause problems. I expect
> most PHYs actual share the period across multiple LEDs, which you
> cannot easily model here.
> 
> So i would have the driver hard coded to pick a frequency at thats' it.
> 

Yes I think "for now" it's the only way and just drop blink
configuration support.
diff mbox series

Patch

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 */