kernel: 5.15: Backport Turris Omnia LED patches

This backports patches
  leds: turris-omnia: convert to use dev_groups
  leds: turris-omnia: Use sysfs_emit() instead of sprintf()
  leds: turris-omnia: Drop unnecessary mutex locking
  leds: turris-omnia: Do not use SMBUS calls
  leds: turris-omnia: Make set_brightness() more efficient
  leds: turris-omnia: Support HW controlled mode via private trigger
  leds: turris-omnia: Add support for enabling/disabling HW gamma correction
  leds: turris-omnia: Fix brightness setting and trigger activating
into backport-5.15.

The above patches replace:
  leds: turris-omnia: support HW controlled mode via private trigger
  leds: turris-omnia: initialize multi-intensity to full
  leds: turris-omnia: change max brightness from 255 to 1
from mvebu/patches-5.15.

Signed-off-by: Marek Behún <kabel@kernel.org>

3 files changed, 0 insertions, 182 deletions

diff --git a/target/linux/mvebu/patches-5.15/102-leds-turris-omnia-support-HW-controlled-mode-via-pri.patch b/target/linux/mvebu/patches-5.15/102-leds-turris-omnia-support-HW-controlled-mode-via-pri.patch
deleted file mode 100644
index c14469460a..0000000000
--- a/target/linux/mvebu/patches-5.15/102-leds-turris-omnia-support-HW-controlled-mode-via-pri.patch
+++ /dev/null
@@ -1,118 +0,0 @@
-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 Behún <kabel@kernel.org>
----
- drivers/leds/Kconfig             |  1 +
- drivers/leds/leds-turris-omnia.c | 41 ++++++++++++++++++++++++++++++++
- 2 files changed, 42 insertions(+)
-
---- 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
---- 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
- 	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_c
- 
- 	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);
diff --git a/target/linux/mvebu/patches-5.15/103-leds-turris-omnia-initialize-multi-intensity-to-full.patch b/target/linux/mvebu/patches-5.15/103-leds-turris-omnia-initialize-multi-intensity-to-full.patch
deleted file mode 100644
index 1fe76b8f2c..0000000000
--- a/target/linux/mvebu/patches-5.15/103-leds-turris-omnia-initialize-multi-intensity-to-full.patch
+++ /dev/null
@@ -1,33 +0,0 @@
-From bda176cceb735b9b46c1900658b6486c34e13ae6 Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <kabel@kernel.org>
-Date: Mon, 4 Jul 2022 12:59:54 +0200
-Subject: [PATCH] leds: turris-omnia: initialize multi-intensity to full
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-The default color of each LED before driver probe (255, 255, 255).
-Initialize multi_intensity to this value, so that it corresponds to the
-reality.
-
-Signed-off-by: Marek Behún <kabel@kernel.org>
----
- drivers/leds/leds-turris-omnia.c | 3 +++
- 1 file changed, 3 insertions(+)
-
---- a/drivers/leds/leds-turris-omnia.c
-+++ b/drivers/leds/leds-turris-omnia.c
-@@ -131,10 +131,13 @@ static int omnia_led_register(struct i2c
- 	}
- 
- 	led->subled_info[0].color_index = LED_COLOR_ID_RED;
-+	led->subled_info[0].intensity = 255;
- 	led->subled_info[0].channel = 0;
- 	led->subled_info[1].color_index = LED_COLOR_ID_GREEN;
-+	led->subled_info[1].intensity = 255;
- 	led->subled_info[1].channel = 1;
- 	led->subled_info[2].color_index = LED_COLOR_ID_BLUE;
-+	led->subled_info[2].intensity = 255;
- 	led->subled_info[2].channel = 2;
- 
- 	led->mc_cdev.subled_info = led->subled_info;
diff --git a/target/linux/mvebu/patches-5.15/104-leds-turris-omnia-change-max-brightness-from-255-to-.patch b/target/linux/mvebu/patches-5.15/104-leds-turris-omnia-change-max-brightness-from-255-to-.patch
deleted file mode 100644
index fb8864dfd1..0000000000
--- a/target/linux/mvebu/patches-5.15/104-leds-turris-omnia-change-max-brightness-from-255-to-.patch
+++ /dev/null
@@ -1,31 +0,0 @@
-From 349cbe949b9622cc05b148ecfa6268cbbae35b45 Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <kabel@kernel.org>
-Date: Mon, 4 Jul 2022 12:59:55 +0200
-Subject: [PATCH] leds: turris-omnia: change max brightness from 255 to 1
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-Using binary brightness makes more sense for this controller, because
-internally in the MCU it works that way: the LED has a color, and a
-state whether it is ON or OFF.
-
-The resulting brightness computation with led_mc_calc_color_components()
-will now always result in either (0, 0, 0) or the multi_intensity value.
-
-Signed-off-by: Marek Behún <kabel@kernel.org>
----
- drivers/leds/leds-turris-omnia.c | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
---- a/drivers/leds/leds-turris-omnia.c
-+++ b/drivers/leds/leds-turris-omnia.c
-@@ -146,7 +146,7 @@ static int omnia_led_register(struct i2c
- 	init_data.fwnode = &np->fwnode;
- 
- 	cdev = &led->mc_cdev.led_cdev;
--	cdev->max_brightness = 255;
-+	cdev->max_brightness = 1;
- 	cdev->brightness_set_blocking = omnia_led_brightness_set_blocking;
- 	cdev->trigger_type = &omnia_hw_trigger_type;
- 	cdev->default_trigger = omnia_hw_trigger.name;