refactor(core): introduce separate backlight pin driver

[no changelog]

core/embed/io/backlight/stm32/backlight_pin.c

@@ -0,0 +1,103 @@
+/*
+ * This file is part of the Trezor project, https://trezor.io/
+ *
+ * Copyright (c) SatoshiLabs
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <io/backlight.h>
+
+#include <trezor_bsp.h>
+#include <trezor_rtl.h>
+
+typedef struct {
+  // Set if driver is initialized
+  bool initialized;
+  // Current backlight level in range 0-255
+  int current_level;
+
+} backlight_driver_t;
+
+static backlight_driver_t g_backlight_driver = {
+    .initialized = false,
+};
+
+static void backlight_on(void) {
+  GPIO_InitTypeDef GPIO_InitStructure = {0};
+  GPIO_InitStructure.Mode = GPIO_MODE_INPUT;
+  GPIO_InitStructure.Pull = GPIO_PULLUP;
+  GPIO_InitStructure.Pin = BACKLIGHT_PIN_PIN;
+  GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_LOW;
+  HAL_GPIO_Init(BACKLIGHT_PIN_PORT, &GPIO_InitStructure);
+}
+
+static void backlight_off(void) {
+  GPIO_InitTypeDef GPIO_InitStructure = {0};
+  GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
+  GPIO_InitStructure.Pull = GPIO_NOPULL;
+  GPIO_InitStructure.Pin = BACKLIGHT_PIN_PIN;
+  GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_LOW;
+  HAL_GPIO_Init(BACKLIGHT_PIN_PORT, &GPIO_InitStructure);
+}
+
+void backlight_init(backlight_action_t action) {
+  backlight_driver_t *drv = &g_backlight_driver;
+
+  if (drv->initialized) {
+    return;
+  }
+
+  BACKLIGHT_PIN_CLK_ENABLE();
+
+  if (action == BACKLIGHT_RESET) {
+    backlight_off();
+  };
+
+  drv->initialized = true;
+}
+
+void backlight_deinit(backlight_action_t action) {
+  backlight_driver_t *drv = &g_backlight_driver;
+  if (!drv->initialized) {
+    return;
+  }
+
+  if (action == BACKLIGHT_RESET) {
+    backlight_off();
+  }
+}
+
+int backlight_set(int val) {
+  backlight_driver_t *drv = &g_backlight_driver;
+  if (!drv->initialized) {
+    return 0;
+  }
+
+  if (val > 0) {
+    backlight_on();
+  } else {
+    backlight_off();
+  }
+  drv->current_level = val;
+  return val;
+}
+
+int backlight_get(void) {
+  backlight_driver_t *drv = &g_backlight_driver;
+  if (!drv->initialized) {
+    return 0;
+  }
+  return drv->current_level;
+}

core/embed/io/display/ltdc_dsi/display_driver.c

@@ -356,16 +356,6 @@ bool display_init(display_content_mode_t mode) {
   systick_delay_ms(120);
 #endif
 
-#ifdef DISPLAY_BACKLIGHT_PIN
-  DISPLAY_BACKLIGHT_CLK_ENABLE();
-  /* Configure LCD Backlight Pin */
-  GPIO_InitStructure.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStructure.Pull = GPIO_PULLUP;
-  GPIO_InitStructure.Pin = DISPLAY_BACKLIGHT_PIN;
-  GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_LOW;
-  HAL_GPIO_Init(DISPLAY_BACKLIGHT_PORT, &GPIO_InitStructure);
-#endif
-
 #ifdef USE_BACKLIGHT
   backlight_init(BACKLIGHT_RESET);
 #endif

core/embed/models/D002/boards/stm32u5g9j-dk.h

@@ -9,9 +9,10 @@
 #define DISPLAY_RESET_PIN GPIO_PIN_5
 #define DISPLAY_RESET_PORT GPIOD
 #define DISPLAY_RESET_CLK_ENA __HAL_RCC_GPIOD_CLK_ENABLE
-#define DISPLAY_BACKLIGHT_PIN GPIO_PIN_6
-#define DISPLAY_BACKLIGHT_PORT GPIOI
-#define DISPLAY_BACKLIGHT_CLK_ENABLE() __HAL_RCC_GPIOI_CLK_ENABLE()
+
+#define BACKLIGHT_PIN_PIN GPIO_PIN_6
+#define BACKLIGHT_PIN_PORT GPIOI
+#define BACKLIGHT_PIN_CLK_ENABLE() __HAL_RCC_GPIOI_CLK_ENABLE()
 
 #define I2C_COUNT 1
 #define I2C_INSTANCE_0 I2C5

core/site_scons/models/D002/discovery2.py

@@ -48,6 +48,11 @@ def configure(
     ]
     paths += ["embed/io/display/inc"]
 
+    features_available.append("backlight")
+    defines += [("USE_BACKLIGHT", "1")]
+    sources += ["embed/io/backlight/stm32/backlight_pin.c"]
+    paths += ["embed/io/backlight/inc"]
+
     if "input" in features_wanted:
         sources += ["embed/io/i2c_bus/stm32u5/i2c_bus.c"]
         sources += ["embed/io/touch/sitronix/sitronix.c"]