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/* Copyright 2021 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* MPS MP3385 LED driver.
*/
#include "console.h"
#include "gpio.h"
#include "hooks.h"
#include "i2c.h"
#include "mp3385.h"
#include "task.h"
#include "timer.h"
#define CPRINTS(format, args...) cprints(CC_I2C, format, ##args)
#define CPRINTF(format, args...) cprintf(CC_I2C, format, ##args)
#define I2C_ADDR_MP3385_FLAGS 0x31
struct mp3385_value {
uint8_t offset;
uint8_t data;
};
/*
* MP3385 asserts the interrupt when it's ready for writing settings, which
* are cleared when it's turned off. We enable the interrupt on HOOK_INIT and
* keep it enabled in S0/S3/S5.
*
* It's assumed the device doesn't have a lid and MP3385 is powered only in
* S0. For clamshell devices, different interrupt & power control scheme may be
* needed.
*/
/* This ordering is suggested by vendor. */
static struct mp3385_value mp3385_conf[] = {
/*
* Register 0x01: Operation frequency control
* Frequency selection: 300(KHz)
* Short circuit protection: 8(V)
*/
{ .offset = 1, .data = 0x43 },
/*
* Register 0x02: LED current Full-Scale Register
* ISET Resistor: 127(Kohm)
* Maximum LED current: 20196/127 = 159(mA)
* Setting LED current: 62(mA)
*/
{ .offset = 2, .data = 0x65 },
/* Register 0x03: RO - ignored */
/*
* Register 0x04: Internal LED Dimming Brightness Register
* SMBus PWM function: None Use
*/
{ .offset = 4, .data = 0x00 },
/*
* Register 0x05: OVP, OCP Threshold Register
* Over Current Protection: 0.5(V)
* Panel LED Voltage(Max): 47.8(V)
* OVP setting: 54(V)
*/
{ .offset = 5, .data = 0x97 },
/*
* Register 0x00: Dimming mode Register
* String Selection: 4(Number)
* Interface Selection: 1
* Brightness mode: 3
*/
{ .offset = 0, .data = 0xF2 },
};
static const int mp3385_conf_size = ARRAY_SIZE(mp3385_conf);
static void set_mp3385_reg(void)
{
int i;
for (i = 0; i < mp3385_conf_size; ++i) {
int rv = i2c_write8(I2C_PORT_BACKLIGHT, I2C_ADDR_MP3385_FLAGS,
mp3385_conf[i].offset, mp3385_conf[i].data);
if (rv) {
CPRINTS("Write MP3385 register %d "
"failed rv=%d",
i, rv);
return;
}
}
CPRINTS("Wrote MP3385 settings");
}
static void mp3385_backlight_enable_deferred(void)
{
if (gpio_get_level(GPIO_PANEL_BACKLIGHT_EN))
set_mp3385_reg();
}
DECLARE_DEFERRED(mp3385_backlight_enable_deferred);
void mp3385_interrupt(enum gpio_signal signal)
{
/*
* 1. Spec says backlight should be turned on after 500ms
* after eDP signals are ready.
*
* 2. There's no way to get exact eDP ready time, therefore,
* give one second delay.
*
* power up __/----------------
* eDP ______/------------
* backlight _____________/-----
* |- t1 -| : >=500 ms
* |- t2 -| : 1 second is enough
*/
hook_call_deferred(&mp3385_backlight_enable_deferred_data,
MP3385_POWER_BACKLIGHT_DELAY);
}
int mp3385_set_config(int offset, int data)
{
int i;
for (i = 0; i < mp3385_conf_size; i++) {
if (mp3385_conf[i].offset == offset) {
mp3385_conf[i].data = data;
return EC_SUCCESS;
}
}
CPRINTS("mp3385: offset %d not found", i);
return EC_ERROR_INVAL;
}
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