mvebu: Add support for Turris Omnia MCU

Patches taken from TurrisOS.

Signed-off-by: Marius Dinu <[email protected]>

target/linux/mvebu/image/cortexa9.mk

@@ -104,7 +104,8 @@ define Device/cznic_turris-omnia
   DEVICE_PACKAGES :=  \
     mkf2fs e2fsprogs kmod-fs-vfat kmod-nls-cp437 kmod-nls-iso8859-1 \
     wpad-basic-mbedtls kmod-ath9k kmod-ath10k-ct ath10k-firmware-qca988x-ct \
-    kmod-mt7915-firmware partx-utils kmod-i2c-mux-pca954x kmod-leds-turris-omnia
+    kmod-mt7915-firmware partx-utils kmod-i2c-mux-pca954x kmod-leds-turris-omnia \
+    kmod-turris-omnia-mcu kmod-input-gpio-keys
   IMAGES := sysupgrade.img.gz
   IMAGE/sysupgrade.img.gz := boot-scr | boot-img | sdcard-img | gzip | append-metadata
   SUPPORTED_DEVICES += armada-385-turris-omnia

target/linux/mvebu/modules.mk

@@ -17,10 +17,31 @@ endef
 $(eval $(call KernelPackage,linkstation-poweroff))
 
 
+define KernelPackage/turris-omnia-mcu
+  SUBMENU:=$(OTHER_MENU)
+  TITLE:=CZ.NIC's Turris Omnia MCU driver
+  DEPENDS:=@TARGET_mvebu_cortexa9
+  KCONFIG:= \
+    CONFIG_CZNIC_PLATFORMS=y \
+    CONFIG_TURRIS_OMNIA_MCU
+  FILES:=$(LINUX_DIR)/drivers/platform/cznic/turris-omnia-mcu.ko
+  AUTOLOAD:=$(call AutoLoad,59,turris-omnia-mcu,1)
+endef
+
+define KernelPackage/turris-omnia-mcu/description
+  This adds support for the features implemented by the microcontroller
+  on the CZ.NIC's Turris Omnia SOHO router, including true board
+  poweroff, the ability to configure wake up from powered off state at
+  a specific time, MCU watchdog and MCU connected GPIO pins.
+endef
+
+$(eval $(call KernelPackage,turris-omnia-mcu))
+
+
 define KernelPackage/leds-turris-omnia
    SUBMENU:=$(LEDS_MENU)
    TITLE:=LED support for CZ.NIC's Turris Omnia
-   DEPENDS:=@TARGET_mvebu_cortexa9
+   DEPENDS:=@TARGET_mvebu_cortexa9 +kmod-turris-omnia-mcu
    KCONFIG:=CONFIG_LEDS_TURRIS_OMNIA
    FILES:=$(LINUX_DIR)/drivers/leds/leds-turris-omnia.ko
    AUTOLOAD:=$(call AutoLoad,60,leds-turris-omnia,1)

target/linux/mvebu/patches-5.15/104-v6.7-1-ARM-dts-turris-omnia-Add-global-LED-brightness-chang.patch

@@ -0,0 +1,35 @@
+From e592d86fc0a7a2c8ae21a1055b8b1a508d2d5da9 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <[email protected]>
+Date: Tue, 15 Aug 2023 16:17:31 +0200
+Subject: [PATCH 16/17] ARM: dts: turris-omnia: Add global LED brightness
+ change interrupt
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+When global LED brightness is changed, the MCU can produce an interrupt.
+Add the description for this interrupt to the LED controller.
+
+Fixes: 26ca8b52d6e1 ("ARM: dts: add support for Turris Omnia")
+Signed-off-by: Marek Behún <[email protected]>
+---
+ arch/arm/boot/dts/armada-385-turris-omnia.dts | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/arch/arm/boot/dts/armada-385-turris-omnia.dts b/arch/arm/boot/dts/armada-385-turris-omnia.dts
+index 60b6923d79ec..2778d5e2efd1 100644
+--- a/arch/arm/boot/dts/armada-385-turris-omnia.dts
++++ b/arch/arm/boot/dts/armada-385-turris-omnia.dts
+@@ -224,6 +224,9 @@ led-controller@2b {
+ 				#size-cells = <0>;
+ 				status = "okay";
+
++				interrupt-parent = <&mcu>;
++				interrupts = <11 IRQ_TYPE_NONE>;
++
+ 				/*
+ 				 * LEDs are controlled by MCU (STM32F0) at
+ 				 * address 0x2b.
+-- 
+2.41.0
+

target/linux/mvebu/patches-5.15/104-v6.7-2-leds-turris-omnia-notify-sysfs-on-MCU-global-LEDs-br.patch

@@ -0,0 +1,123 @@
+From f88ea2c70c0046ef185f3e72a8a81e492a5d52ce Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <[email protected]>
+Date: Tue, 15 Aug 2023 18:25:14 +0200
+Subject: [PATCH 17/17] leds: turris-omnia: notify sysfs on MCU global LEDs
+ brightness change
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Recall that on Turris Omnia, the LED controller has a global brightness
+property, which allows the user to make the front LED panel dimmer.
+
+There is also a button on the front panel, which by default is
+configured so that pressing it changes the global brightness to a lower
+value (unless it is at 0%, in which case pressing the button changes the
+global brightness to 100%).
+
+Newer versions of the MCU firmware support informing the SOC that the
+brightness was changed by button press event via an interrupt.
+
+Now that we have the turris-omnia-mcu driver which adds support for MCU
+interrupts, add the ability to inform the userspace that the global
+brightness was changed via sysfs notification.
+
+Signed-off-by: Marek Behún <[email protected]>
+---
+ drivers/leds/leds-turris-omnia.c | 38 ++++++++++++++++++++++++++++++++
+ 1 file changed, 38 insertions(+)
+
+diff --git a/drivers/leds/leds-turris-omnia.c b/drivers/leds/leds-turris-omnia.c
+index 9cd49833c6b2..fa80c88e18e1 100644
+--- a/drivers/leds/leds-turris-omnia.c
++++ b/drivers/leds/leds-turris-omnia.c
+@@ -23,6 +23,7 @@
+
+ #define CMD_GET_FEATURES		0x10
+ #define FEAT_LED_GAMMA_CORRECTION	BIT(5)
++#define FEAT_BRIGHTNESS_INT		BIT(10)
+
+ /* LED controller commands at I2C address 0x2b */
+ #define CMD_LED_MODE			0x03
+@@ -54,6 +55,7 @@ struct omnia_leds {
+ 	struct i2c_client *client;
+ 	struct mutex lock;
+ 	bool has_gamma_correction;
++	struct kernfs_node *brightness_kn;
+ 	struct omnia_led leds[];
+ };
+
+@@ -431,6 +433,24 @@ static struct attribute *omnia_led_controller_attrs[] = {
+ };
+ ATTRIBUTE_GROUPS(omnia_led_controller);
+
++static irqreturn_t omnia_brightness_changed_handler(int irq, void *dev_id)
++{
++	struct omnia_leds *leds = dev_id;
++	struct device *dev = &leds->client->dev;
++
++	if (!leds->brightness_kn) {
++		leds->brightness_kn = sysfs_get_dirent(dev->kobj.sd,
++						       "brightness");
++
++		if (!leds->brightness_kn)
++			return IRQ_NONE;
++	}
++
++	sysfs_notify_dirent(leds->brightness_kn);
++
++	return IRQ_HANDLED;
++}
++
+ static int omnia_mcu_get_features(const struct i2c_client *client)
+ {
+ 	u16 reply;
+@@ -458,6 +478,7 @@ static int omnia_leds_probe(struct i2c_client *client,
+ {
+ 	struct device *dev = &client->dev;
+ 	struct device_node *np = dev_of_node(dev), *child;
++	bool has_brightness_interrupt;
+ 	struct omnia_leds *leds;
+ 	struct omnia_led *led;
+ 	int ret, count;
+@@ -485,6 +506,8 @@ static int omnia_leds_probe(struct i2c_client *client,
+ 		return ret;
+ 	}
+
++	has_brightness_interrupt = ret & FEAT_BRIGHTNESS_INT;
++
+ 	leds->has_gamma_correction = ret & FEAT_LED_GAMMA_CORRECTION;
+ 	if (!leds->has_gamma_correction) {
+ 		dev_info(dev,
+@@ -512,13 +535,28 @@ static int omnia_leds_probe(struct i2c_client *client,
+ 		led += ret;
+ 	}
+
++	/* If MCU supports global brigthness change interrupt, handle it */
++	if (has_brightness_interrupt) {
++		ret = devm_request_any_context_irq(dev, client->irq,
++						   omnia_brightness_changed_handler,
++						   IRQF_ONESHOT,
++						   "leds-turris-omnia", leds);
++		if (ret < 0)
++			return dev_err_probe(dev, ret, "Cannot request IRQ\n");
++	}
++
+ 	return 0;
+ }
+
+ static int omnia_leds_remove(struct i2c_client *client)
+ {
++	struct omnia_leds *leds = i2c_get_clientdata(client);
+ 	u8 buf[5];
+
++	/* Release global brightness sysfs node */
++	if (leds->brightness_kn)
++		sysfs_put(leds->brightness_kn);
++
+ 	/* put all LEDs into default (HW triggered) mode */
+ 	omnia_cmd_write_u8(client, CMD_LED_MODE,
+ 			   CMD_LED_MODE_LED(OMNIA_BOARD_LEDS));
+-- 
+2.41.0
+