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-rw-r--r--pkgs/patches-linux-5.15/102-leds-turris-omnia-support-HW-controlled-mode-via-pri.patch125
1 files changed, 125 insertions, 0 deletions
diff --git a/pkgs/patches-linux-5.15/102-leds-turris-omnia-support-HW-controlled-mode-via-pri.patch b/pkgs/patches-linux-5.15/102-leds-turris-omnia-support-HW-controlled-mode-via-pri.patch
new file mode 100644
index 0000000..05520a8
--- /dev/null
+++ b/pkgs/patches-linux-5.15/102-leds-turris-omnia-support-HW-controlled-mode-via-pri.patch
@@ -0,0 +1,125 @@
+From 80e643510cb14f116f687e992210c0008a09d869 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <kabel@kernel.org>
+Date: Mon, 4 Jul 2022 12:59:53 +0200
+Subject: [PATCH] leds: turris-omnia: support HW controlled mode via
+ private trigger
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Add support for enabling MCU controlled mode of the Turris Omnia LEDs
+via a LED private trigger called "omnia-mcu".
+
+When in MCU controlled mode, the user can still set LED color, but the
+blinking is done by MCU, which does different things for various LEDs:
+- WAN LED is blinked according to the LED[0] pin of the WAN PHY
+- LAN LEDs are blinked according to the LED[0] output of corresponding
+ port of the LAN switch
+- PCIe LEDs are blinked according to the logical OR of the MiniPCIe port
+ LED pins
+
+For a long time I wanted to actually do this differently: I wanted to
+make the netdev trigger to transparently offload the blinking to the HW
+if user set compatible settings for the netdev trigger.
+There was some work on this, and hopefully we will be able to complete
+it sometime, but since there are various complications, it will probably
+not be soon.
+
+In the meantime let's support HW controlled mode via this private LED
+trigger. If, in the future, we manage to complete the netdev trigger
+offloading, we can still keep this private trigger for backwards
+compatiblity, if needed.
+
+We also set "omnia-mcu" to cdev->default_trigger, so that the MCU keeps
+control until the user first wants to take over it. If a different
+default trigger is specified in device-tree via the
+`linux,default-trigger` property, LED class will overwrite
+cdev->default_trigger, and so the DT property will be respected.
+
+Signed-off-by: Marek BehĂșn <kabel@kernel.org>
+---
+ drivers/leds/Kconfig | 1 +
+ drivers/leds/leds-turris-omnia.c | 41 ++++++++++++++++++++++++++++++++
+ 2 files changed, 42 insertions(+)
+
+diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
+index ed800f5da7d8..52f010b8f58e 100644
+--- a/drivers/leds/Kconfig
++++ b/drivers/leds/Kconfig
+@@ -163,6 +163,7 @@ config LEDS_TURRIS_OMNIA
+ depends on I2C
+ depends on MACH_ARMADA_38X || COMPILE_TEST
+ depends on OF
++ select LEDS_TRIGGERS
+ help
+ This option enables basic support for the LEDs found on the front
+ side of CZ.NIC's Turris Omnia router. There are 12 RGB LEDs on the
+diff --git a/drivers/leds/leds-turris-omnia.c b/drivers/leds/leds-turris-omnia.c
+index 1adfed1c0619..c2dfb22d3065 100644
+--- a/drivers/leds/leds-turris-omnia.c
++++ b/drivers/leds/leds-turris-omnia.c
+@@ -41,6 +41,39 @@ struct omnia_leds {
+ struct omnia_led leds[];
+ };
+
++static struct led_hw_trigger_type omnia_hw_trigger_type;
++
++static int omnia_hwtrig_activate(struct led_classdev *cdev)
++{
++ struct omnia_leds *leds = dev_get_drvdata(cdev->dev->parent);
++ struct omnia_led *led = to_omnia_led(lcdev_to_mccdev(cdev));
++
++ /* put the LED into MCU controlled mode */
++ return i2c_smbus_write_byte_data(leds->client, CMD_LED_MODE,
++ CMD_LED_MODE_LED(led->reg));
++}
++
++static void omnia_hwtrig_deactivate(struct led_classdev *cdev)
++{
++ struct omnia_leds *leds = dev_get_drvdata(cdev->dev->parent);
++ struct omnia_led *led = to_omnia_led(lcdev_to_mccdev(cdev));
++ int ret;
++
++ /* put the LED into software mode */
++ ret = i2c_smbus_write_byte_data(leds->client, CMD_LED_MODE,
++ CMD_LED_MODE_LED(led->reg) |
++ CMD_LED_MODE_USER);
++ if (ret < 0)
++ dev_err(cdev->dev, "Cannot put to software mode: %i\n", ret);
++}
++
++static struct led_trigger omnia_hw_trigger = {
++ .name = "omnia-mcu",
++ .activate = omnia_hwtrig_activate,
++ .deactivate = omnia_hwtrig_deactivate,
++ .trigger_type = &omnia_hw_trigger_type,
++};
++
+ static int omnia_led_brightness_set_blocking(struct led_classdev *cdev,
+ enum led_brightness brightness)
+ {
+@@ -112,6 +145,8 @@ static int omnia_led_register(struct i2c_client *client, struct omnia_led *led,
+ cdev = &led->mc_cdev.led_cdev;
+ cdev->max_brightness = 255;
+ cdev->brightness_set_blocking = omnia_led_brightness_set_blocking;
++ cdev->trigger_type = &omnia_hw_trigger_type;
++ cdev->default_trigger = omnia_hw_trigger.name;
+
+ /* put the LED into software mode */
+ ret = i2c_smbus_write_byte_data(client, CMD_LED_MODE,
+@@ -228,6 +263,12 @@ static int omnia_leds_probe(struct i2c_client *client,
+
+ mutex_init(&leds->lock);
+
++ ret = devm_led_trigger_register(dev, &omnia_hw_trigger);
++ if (ret < 0) {
++ dev_err(dev, "Cannot register private LED trigger: %d\n", ret);
++ return ret;
++ }
++
+ led = &leds->leds[0];
+ for_each_available_child_of_node(np, child) {
+ ret = omnia_led_register(client, led, child);
+--
+2.34.1
+