Kalista: Write panel settings to OZ554

GPIO44 is used for panel backlight enable interrupt.
If EC receive rising interrupt, write panel settings to OZ554.

BUG=b:120237453
BRANCH=none
TEST=make buildall pass, panel can show screen properly

Change-Id: I45cd12b5b334db39fa989ab435240d272dc39d7c
Signed-off-by: Tino Liu <tino.liu@quanta.corp-partner.google.com>
Reviewed-on: https://chromium-review.googlesource.com/1351909
Commit-Ready: Ryan Zhang <ryan.zhang@quanta.corp-partner.google.com>
Tested-by: Ryan Zhang <ryan.zhang@quanta.corp-partner.google.com>
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
(cherry picked from commit ef17e123c89b45cc6ee6ceaaf2a047f29ee60980)
Reviewed-on: https://chromium-review.googlesource.com/c/1385766
Commit-Queue: Ryan Zhang <ryan.zhang@quanta.corp-partner.google.com>

4 files changed, 117 insertions, 1 deletions

diff --git a/board/karma/board.c b/board/karma/board.c
new file mode 100644
index 0000000000..49f1b919a3
--- /dev/null
+++ b/board/karma/board.c
@@ -0,0 +1,109 @@
+/* Copyright 2018 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "console.h"
+#include "gpio.h"
+#include "hooks.h"
+#include "i2c.h"
+#include "task.h"
+#include "timer.h"
+
+#define CPRINTS(format, args...) cprints(CC_GPIO, format, ## args)
+#define CPRINTF(format, args...) cprintf(CC_GPIO, format, ## args)
+
+#define I2C_ADDR_OZ554		0x62
+#define OZ554_DATA_SIZE		6
+
+struct oz554_value {
+	uint8_t offset;
+	uint8_t data;
+};
+
+/* This ordering is suggested by vendor. */
+static const struct oz554_value oz554_order[] = {
+	/*
+	 * Reigster 0x01: Operation frequency control
+	 * Frequency selection: 300(KHz)
+	 * Short circuit protection: 8(V)
+	 */
+	{.offset = 1, .data = 0x43},
+	/*
+	 * Reigster 0x02: LED current amplitude control
+	 * ISET Resistor: 10.2(Kohm)
+	 * Maximum LED current: 1636/10.2 = 160.4(mA)
+	 * Setting LED current: 65(mA)
+	 */
+	{.offset = 2, .data = 0x65},
+	/*
+	 * Reigster 0x03: LED backlight Status
+	 * Status function: Read only
+	 */
+	{.offset = 3, .data = 0x00},
+	/*
+	 * Reigster 0x04: LED current control with SMBus
+	 * SMBus PWM function: None Use
+	 */
+	{.offset = 4, .data = 0x00},
+	/*
+	 * Reigster 0x05: OVP, OCP control
+	 * Over Current Protection: 0.5(V)
+	 * Panel LED Voltage(Max): 47.8(V)
+	 * OVP setting: 54(V)
+	 */
+	{.offset = 5, .data = 0x97},
+	/*
+	 * Reigster 0x00: Dimming mode and string ON/OFF control
+	 * String Selection: 4(Number)
+	 * Interface Selection: 1
+	 * Brightness mode: 3
+	 */
+	{.offset = 0, .data = 0xF2},
+};
+BUILD_ASSERT(ARRAY_SIZE(oz554_order) == OZ554_DATA_SIZE);
+
+static void set_oz554_reg(void)
+{
+	int i, rv;
+
+	for (i = 0; i < OZ554_DATA_SIZE; ++i) {
+		rv = i2c_write8(
+			NPCX_I2C_PORT1,
+			I2C_ADDR_OZ554,
+			oz554_order[i].offset,
+			oz554_order[i].data);
+
+		if (rv) {
+			CPRINTS("Write OZ554 register index %d failed, rv = %d"
+				, i, rv);
+			break;
+		}
+	}
+}
+
+static void backlight_enable_deferred(void)
+{
+	if (gpio_get_level(GPIO_PANEL_BACKLIGHT_EN))
+		set_oz554_reg();
+}
+DECLARE_DEFERRED(backlight_enable_deferred);
+
+void backlight_enable_interrupt(enum gpio_signal signal)
+{
+	hook_call_deferred(&backlight_enable_deferred_data, 30 * MSEC);
+}
+
+static void karma_chipset_resume(void)
+{
+	/* Enable panel backlight interrupt. */
+	gpio_enable_interrupt(GPIO_PANEL_BACKLIGHT_EN);
+}
+DECLARE_HOOK(HOOK_CHIPSET_RESUME, karma_chipset_resume, HOOK_PRIO_DEFAULT);
+
+static void karma_chipset_shutdown(void)
+{
+	/* Disable panel backlight interrupt. */
+	gpio_disable_interrupt(GPIO_PANEL_BACKLIGHT_EN);
+}
+DECLARE_HOOK(HOOK_CHIPSET_SUSPEND, karma_chipset_shutdown, HOOK_PRIO_DEFAULT);
diff --git a/board/karma/board.h b/board/karma/board.h
index 372b18509b..85c4642fcb 100644
--- a/board/karma/board.h
+++ b/board/karma/board.h
@@ -10,4 +10,10 @@
 
 #include "baseboard.h"
 
+#ifndef __ASSEMBLER__
+
+void backlight_enable_interrupt(enum gpio_signal signal);
+
+#endif /* !__ASSEMBLER__ */
+
 #endif /* __CROS_EC_BOARD_H */
diff --git a/board/karma/build.mk b/board/karma/build.mk
index 05884cf221..82d7890946 100644
--- a/board/karma/build.mk
+++ b/board/karma/build.mk
@@ -9,3 +9,4 @@
 CHIP:=npcx
 CHIP_VARIANT:=npcx5m6g
 BASEBOARD:=kalista
+board-y=board.o
diff --git a/board/karma/gpio.inc b/board/karma/gpio.inc
index d5b47800dc..12a7fef919 100644
--- a/board/karma/gpio.inc
+++ b/board/karma/gpio.inc
@@ -11,6 +11,7 @@
 GPIO_INT(USB_C0_PD_INT_ODL,	PIN(3, 7), GPIO_INT_FALLING | GPIO_PULL_UP,	tcpc_alert_event)
 GPIO_INT(AC_PRESENT,		PIN(C, 1), GPIO_INT_BOTH,			extpower_interrupt)
 GPIO_INT(POWER_BUTTON_L,	PIN(0, 4), GPIO_INT_BOTH | GPIO_PULL_UP,	power_button_interrupt)	/* MECH_PWR_BTN_ODL */
+GPIO_INT(PANEL_BACKLIGHT_EN,	PIN(4, 4), GPIO_INT_RISING, backlight_enable_interrupt)
 
 GPIO_INT(PCH_SLP_S0_L,		PIN(7, 5), GPIO_INT_BOTH,			power_signal_interrupt)
 GPIO_INT(PCH_SLP_SUS_L,		PIN(6, 2), GPIO_INT_BOTH,			power_signal_interrupt)
@@ -84,7 +85,6 @@ GPIO(SPKR5,			PIN(C, 2), GPIO_INPUT)				/* No function */
 /* Test points */
 GPIO(TP48,			PIN(B, 1), GPIO_INPUT)
 GPIO(TP52,			PIN(C, 3), GPIO_INPUT)
-GPIO(TP120,			PIN(4, 4), GPIO_INPUT)
 GPIO(TP121,			PIN(3, 3), GPIO_INPUT)
 GPIO(TP123,			PIN(C, 5), GPIO_INPUT)
 GPIO(TP127,			PIN(6, 6), GPIO_INPUT)