backlight refactoring + TPS61062 driver

core/embed/io/display/backlight/backlight_pwm.h → core/embed/io/backlight/inc/io/backlight.h

@@ -17,8 +17,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef TREZORHAL_BACKLIGHT_H
-#define TREZORHAL_BACKLIGHT_H
+#pragma once
 
 // Action to be taken when initializing or
 // deinitializing the backlight driver
@@ -32,26 +31,24 @@ typedef enum {
 // If the action is set to `BACKLIGHT_RESET`, the backlight level
 // is set to zero level. If the action is set to `BACKLIGHT_RETAIN`,
 // the backlight level is not changed (if possible).
-void backlight_pwm_init(backlight_action_t action);
+void backlight_init(backlight_action_t action);
 
 // Deinitialize the backlight driver
 //
 // If the action is set to `BACKLIGHT_RESET`, the backlight driver
 // is completely deinitialized. If the action is set to `BACKLIGHT_RETAIN`,
 // the driver is deinitialized as much as possible but the backlight
 // is kept on.
-void backlight_pwm_deinit(backlight_action_t action);
+void backlight_deinit(backlight_action_t action);
 
 // Sets the backlight level in range 0-255 and returns the actual level set.
 //
 // If the level is outside the range, the function has no effect
 // and just returns the actual level set. If the backlight driver
 // is not initialized, the function returns 0.
-int backlight_pwm_set(int val);
+int backlight_set(int val);
 
 // Gets the backlight level in range 0-255
 //
 // Returns 0 if the backlight driver is not initialized.
-int backlight_pwm_get(void);
-
-#endif  // TREZORHAL_BACKLIGHT_H
+int backlight_get(void);

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;
+}