1 files changed, 128 insertions, 0 deletions
diff --git a/zephyr/projects/trogdor/lazor/src/switchcap.c b/zephyr/projects/trogdor/lazor/src/switchcap.c
new file mode 100644
index 0000000000..d8205cbcfc
--- /dev/null
+++ b/zephyr/projects/trogdor/lazor/src/switchcap.c
@@ -0,0 +1,128 @@
+/* Copyright 2022 The ChromiumOS Authors
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <zephyr/drivers/gpio.h>
+
+#include "common.h"
+#include "config.h"
+#include "console.h"
+#include "driver/ln9310.h"
+#include "gpio/gpio_int.h"
+#include "hooks.h"
+#include "i2c.h"
+#include "power/qcom.h"
+#include "system.h"
+#include "sku.h"
+
+#define CPRINTS(format, args...) cprints(CC_I2C, format, ##args)
+#define CPRINTF(format, args...) cprintf(CC_I2C, format, ##args)
+
+/* LN9310 switchcap */
+const struct ln9310_config_t ln9310_config = {
+	.i2c_port = I2C_PORT_POWER,
+	.i2c_addr_flags = LN9310_I2C_ADDR_0_FLAGS,
+};
+
+static void switchcap_init(void)
+{
+	if (board_has_da9313()) {
+		CPRINTS("Use switchcap: DA9313");
+
+		/*
+		 * When the chip in power down mode, it outputs high-Z.
+		 * Set pull-down to avoid floating.
+		 */
+		gpio_pin_configure_dt(GPIO_DT_FROM_NODELABEL(gpio_da9313_gpio0),
+				      GPIO_INPUT | GPIO_PULL_DOWN);
+
+		/*
+		 * Configure DA9313 enable, push-pull output. Don't set the
+		 * level here; otherwise, it will override its value and
+		 * shutdown the switchcap when sysjump to RW.
+		 */
+		gpio_pin_configure_dt(GPIO_DT_FROM_NODELABEL(gpio_switchcap_on),
+				      GPIO_OUTPUT);
+	} else if (board_has_ln9310()) {
+		CPRINTS("Use switchcap: LN9310");
+
+		/* Enable interrupt for LN9310 */
+		gpio_enable_dt_interrupt(
+			GPIO_INT_FROM_NODELABEL(int_switchcap_pg));
+
+		/*
+		 * Configure LN9310 enable, open-drain output. Don't set the
+		 * level here; otherwise, it will override its value and
+		 * shutdown the switchcap when sysjump to RW.
+		 *
+		 * Note that the gpio.inc configures it GPIO_OUT_LOW. When
+		 * sysjump to RW, will output push-pull a short period of
+		 * time. As it outputs LOW, should be fine.
+		 *
+		 * This GPIO changes like:
+		 * (1) EC boots from RO -> high-Z
+		 * (2) GPIO init according to gpio.inc -> push-pull LOW
+		 * (3) This function configures it -> open-drain HIGH
+		 * (4) Power sequence turns on the switchcap -> open-drain LOW
+		 * (5) EC sysjumps to RW
+		 * (6) GPIO init according to gpio.inc -> push-pull LOW
+		 * (7) This function configures it -> open-drain LOW
+		 */
+		gpio_pin_configure_dt(GPIO_DT_FROM_NODELABEL(gpio_switchcap_on),
+				      GPIO_OUTPUT | GPIO_OPEN_DRAIN);
+
+		/* Only configure the switchcap if not sysjump */
+		if (!system_jumped_late()) {
+			/*
+			 * Deassert the enable pin, so the
+			 * switchcap won't be enabled after the switchcap is
+			 * configured from standby mode to switching mode.
+			 */
+			gpio_pin_set_dt(
+				GPIO_DT_FROM_NODELABEL(gpio_switchcap_on), 0);
+			ln9310_init();
+		}
+	} else if (board_has_buck_ic()) {
+		CPRINTS("Use Buck IC");
+	} else {
+		CPRINTS("ERROR: No switchcap solution");
+	}
+}
+DECLARE_HOOK(HOOK_INIT, switchcap_init, HOOK_PRIO_DEFAULT);
+
+void board_set_switchcap_power(int enable)
+{
+	if (board_has_da9313()) {
+		gpio_pin_set_dt(GPIO_DT_FROM_NODELABEL(gpio_switchcap_on),
+				enable);
+	} else if (board_has_ln9310()) {
+		gpio_pin_set_dt(GPIO_DT_FROM_NODELABEL(gpio_switchcap_on),
+				enable);
+		ln9310_software_enable(enable);
+	} else if (board_has_buck_ic()) {
+		gpio_pin_set_dt(GPIO_DT_FROM_NODELABEL(gpio_vbob_en), enable);
+	}
+}
+
+int board_is_switchcap_enabled(void)
+{
+	if (board_has_da9313() || board_has_ln9310())
+		return gpio_pin_get_dt(
+			GPIO_DT_FROM_NODELABEL(gpio_switchcap_on));
+
+	/* Board has buck ic*/
+	return gpio_pin_get_dt(GPIO_DT_FROM_NODELABEL(gpio_vbob_en));
+}
+
+int board_is_switchcap_power_good(void)
+{
+	if (board_has_da9313())
+		return gpio_pin_get_dt(
+			GPIO_DT_FROM_NODELABEL(gpio_da9313_gpio0));
+	else if (board_has_ln9310())
+		return ln9310_power_good();
+
+	/* Board has buck ic no way to check POWER GOOD */
+	return 1;
+}