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