121 lines
3.5 KiB
C
121 lines
3.5 KiB
C
/*
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* Copyright (C) 2011-2015 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 <lib/mib.h>
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#include <sys.h>
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#include <target.h>
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#define LM3534_GPR (0x10)
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#define LM3534_DFS (0x11)
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#define LM3534_RRR (0x12)
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#define LM3534_BRL (0x13)
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#define LM3534_BRH (0x14)
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#define LM3534_AFT (0x32)
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static bool lm3534_probed;
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static uint32_t lm3534_address[2];
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static uint32_t lm3534_bus[2];
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static bool lm3534_present[2];
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int lm3534_backlight_probe(void)
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{
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uint8_t data[1];
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if (lm3534_probed)
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return lm3534_present[0] ? 0 : -1;
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lm3534_probed = true;
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lm3534_bus[0] = mib_get_u32(kMIBTargetBacklight0I2CBus);
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lm3534_bus[1] = mib_get_u32_opt(kMIBTargetBacklight1I2CBus, (uint32_t)-1);
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lm3534_address[0] = mib_get_u32(kMIBTargetBacklight0I2CAddress);
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lm3534_address[1] = mib_get_u32_opt(kMIBTargetBacklight1I2CAddress, (uint32_t)-1);
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for (unsigned i = 0; i < 2; i++) {
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if (lm3534_bus[i] == (uint32_t)-1) {
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break;
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}
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dprintf(DEBUG_SPEW, "lm3534: probing backlight controller %u at i2c%u address 0x%x\n", i, lm3534_bus[i], lm3534_address[i]);
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// Probe for the LM3534 by reading a register
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data[0] = LM3534_GPR;
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if (iic_read(lm3534_bus[i], lm3534_address[i], data, 1, data, 1, IIC_NORMAL) == 0) {
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// Mark the LM3534 as present
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lm3534_present[i] = true;
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}
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if (!lm3534_present[i]) {
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if (i == 0) {
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// Return an error if the first LM3534 is not present
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dprintf(DEBUG_INFO, "lm3534: failed to detect backlight controller, bailing\n");
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return -1;
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} else {
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// Depending on the display card attached, the second backlight
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// controller may or may not exist. Its absense is not fatal.
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dprintf(DEBUG_INFO, "lm3534: failed to detect second backlight controller, ignoring\n");
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}
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} else {
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dprintf(DEBUG_SPEW, "lm3534: successfully probed backlight controller %u with value 0x%x\n", i, data[0]);
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}
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}
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return 0;
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}
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int lm3534_backlight_enable(uint32_t backlight_level)
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{
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uint8_t data[2];
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if (!lm3534_probed) {
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lm3534_backlight_probe();
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}
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if (!lm3534_present[0])
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return -1;
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for (unsigned i = 0; i < 2; i++) {
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if (!lm3534_present[i])
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break;
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// Configure the backlight for defaults expect no ramp
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dprintf(DEBUG_SPEW, "lm3534: setting backlight controller %u to level %u\n", i, backlight_level);
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data[0] = LM3534_GPR;
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data[1] = target_lm3534_gpr(i);
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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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if (backlight_level == 0)
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data[1] &= ~0x1; // bit 0: chip enable
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iic_write(lm3534_bus[i], lm3534_address[i], data, 2);
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uint32_t thresholdValue = 0;
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if(mib_exists(kMIBTargetBacklightAutoFreqThresh, &thresholdValue)) {
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dprintf(DEBUG_SPEW, "lm3534: Modify Auto-Frequency Threshold (0x%x)\n", thresholdValue);
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data[0] = LM3534_AFT;
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data[1] = thresholdValue;
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iic_write(lm3534_bus[i], lm3534_address[i], data, 2);
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}
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}
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// <rdar://problem/11055346> Not seeing the battery trap icon
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// Delay to ensure that the LM3534 settings are processed before issuing dwi transaction
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spin(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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