first and last commit

drivers/backlight/lp8559/lp8559.c

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+/*
+ * Copyright (C) 2013 Apple Inc. All rights reserved.
+ *
+ * This document is the property of Apple Inc.
+ * It is considered confidential and proprietary.
+ *
+ * This document may not be reproduced or transmitted in any form,
+ * in whole or in part, without the express written permission of
+ * Apple Inc.
+ */
+#include <debug.h>
+#include <drivers/iic.h>
+#include <target/gpiodef.h>
+#include <sys/task.h>
+#include "lp8559.h"
+
+static bool lp8559_probed;
+static bool lp8559_present;
+
+int beacon_reg_read(uint8_t reg_offset, uint8_t *value)
+{
+	int status;
+	status = iic_read(BACKLIGHT_IIC_BUS, lp8559_IIC_ADDRESS, &reg_offset, 1, value, 1, IIC_NORMAL);
+	return status;
+}
+
+int beacon_reg_write(uint8_t reg_offset, uint8_t value)
+{
+	int status;
+	uint8_t data[2] = {reg_offset, value};
+	status = iic_write(BACKLIGHT_IIC_BUS, lp8559_IIC_ADDRESS, data, 2);
+	return status;
+}
+
+int lp8559_backlight_enable(uint32_t backlight_level)
+{
+	uint8_t cmd, epromid;
+
+	if (!lp8559_probed) {
+		// Probe for the lp8559 by reading a register
+		if (beacon_reg_read(lp8559_COMMAND, &cmd) == 0) {
+			// Mark the lp8559 as present
+			lp8559_present = true;
+		}
+
+		// Mark the lp8559 as probed
+		lp8559_probed = true;
+	}
+
+	// Return an error if the lp8559 is not present
+	if (!lp8559_present) {
+		dprintf(DEBUG_INFO, "failed to detect lp8559, bailing\n");
+		return -1;
+	}
+
+	// Workaround for chips with EPROMID = 0x0
+	// <rdar://problem/13700089> J85: Need to update register values in Beacon
+	beacon_reg_read(lp8559_EPROMID, &epromid);
+	if (epromid == 0x10) {
+		// Unlock protected registers
+		beacon_reg_write(lp8559_LOCK, 0xCF);
+
+		// Set inductor current limit to 2.2A
+		beacon_reg_write(lp8559_CONFIG, 0x62);
+
+		// Set IMAX to 20mA:
+		beacon_reg_write(lp8559_CURRENT, 0x02);
+
+		// Set PWM cutover point to 1mA
+		beacon_reg_write(lp8559_HYBRIDLO, 0x33);
+
+		// Set SLOPE and VERT headroom control
+		beacon_reg_write(lp8559_VHR1, 0x26);
+
+		// Set PWM global offset
+		beacon_reg_write(lp8559_TRIM9, 0x08);
+
+		// Lock protected registers
+		beacon_reg_write(lp8559_LOCK, 0x00);
+	}
+
+	beacon_reg_read(lp8559_COMMAND, &cmd);
+
+
+	// <rdar://problem/20615779>
+	// Dark boot may hand off to the OS with backlight disabled, but the OS backlight driver depends on iBoot
+	// to configure the backlight even if it's left disabled.
+
+	// read modify write
+	// Bit 0  - on, Bit 3 - enable DWI
+	cmd |= 0x9;
+	if (backlight_level == 0) {
+		cmd &= ~(0x9);
+	}
+
+	// Configure the backlight for defaults expect no ramp
+	beacon_reg_write(lp8559_COMMAND, cmd);
+
+	// IS this Required ?? 
+	// <rdar://problem/11055346> Not seeing the battery trap icon
+	// Delay to ensure that the lp8559 settings are processed before issuing dwi transaction
+	task_sleep(600);
+
+	extern int dwi_send_backlight_command(uint32_t backlight_command, uint32_t backlight_level);
+
+	dwi_send_backlight_command(0xA, backlight_level);
+
+	return 0;
+}

drivers/backlight/lp8559/lp8559.h

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+/*
+ * Copyright (C) 2013 Apple Inc. All rights reserved.
+ *
+ * This document is the property of Apple Inc.
+ * It is considered confidential and proprietary.
+ *
+ * This document may not be reproduced or transmitted in any form,
+ * in whole or in part, without the express written permission of
+ * Apple Inc.
+ */
+#ifndef __DRIVERS_LP8559_H
+#define __DRIVERS_LP8559_H
+
+#define lp8559_IIC_ADDRESS	(0x4C)
+
+#define lp8559_COMMAND		(0x00)
+#define lp8559_LOCK		(0x0F)
+#define lp8559_CONFIG		(0x10)
+#define lp8559_CURRENT		(0x11)
+#define lp8559_BCFG1		(0x15)
+#define lp8559_BCFG2		(0x16)
+#define lp8559_BCFG3		(0x17)
+#define lp8559_BCFG5		(0x19)
+#define lp8559_HYBRIDLO		(0x1A)
+#define lp8559_VHR1		(0x1E)
+#define lp8559_BCTRL		(0x20)
+#define lp8559_TRIM2		(0x51)
+#define lp8559_TRIM5		(0x54)
+#define lp8559_TRIM9		(0x58)
+#define lp8559_LEDCFG		(0xE6)
+#define lp8559_TMLOCK		(0xEE)
+#define lp8559_EPROMID		(0xFC)
+
+int beacon_reg_read(uint8_t reg_offset, uint8_t *value);
+int beacon_reg_write(uint8_t reg_offset, uint8_t value);
+
+#endif /* __DRIVERS_LP8559_H */

drivers/backlight/lp8559/rules.mk

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+# Copyright (C) 2013 Apple Inc. All rights reserved.
+#
+# This document is the property of Apple Inc.
+# It is considered confidential and proprietary.
+#
+# This document may not be reproduced or transmitted in any form,
+# in whole or in part, without the express written permission of
+# Apple Inc.
+#
+LOCAL_DIR := $(GET_LOCAL_DIR)
+
+OPTIONS += \
+	WITH_HW_LP8559=1
+
+ALL_OBJS += \
+	$(LOCAL_DIR)/lp8559.o