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/*
* Copyright (C) 2014 Paul Kocialkowski <contact@paulk.fr>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <i2c.h>
#include <asm/gpio.h>
#include <lp8720.h>
static struct lp8720_info lp8720_info;
static int lp8720_write(u8 reg, u8 val)
{
return i2c_write(lp8720_info.chip_idsel, reg, 1, &val, 1);
}
static int lp8720_read(u8 reg, u8 *val)
{
return i2c_read(lp8720_info.chip_idsel, reg, 1, val, 1);
}
int lp8720_init(int enable_gpio, int chip_idsel)
{
int ret;
if (enable_gpio) {
if (!gpio_is_valid(enable_gpio))
return -1;
ret = gpio_request(enable_gpio, "lp8720_en");
if (ret)
return ret;
ret = gpio_direction_output(enable_gpio, 0);
if (ret)
return ret;
}
lp8720_info.enable_gpio = enable_gpio;
lp8720_info.chip_idsel = chip_idsel;
return 0;
}
int lp8720_enable(void)
{
int ret;
if (lp8720_info.enable_gpio) {
ret = gpio_set_value(lp8720_info.enable_gpio, 1);
if (ret)
return ret;
}
return 0;
}
int lp8720_is_enabled(void)
{
if (lp8720_info.enable_gpio)
return gpio_get_value(lp8720_info.enable_gpio);
/* Assume LP8720 enabled when there is no enable GPIO */
return 1;
}
int lp8720_ldo_enable(u8 ldo_enable)
{
u8 val;
int ret;
ret = lp8720_read(LP8720_ENABLE_BITS, &val);
if (ret)
return ret;
val |= ldo_enable;
ret = lp8720_write(LP8720_ENABLE_BITS, val);
if (ret)
return ret;
/* Enable the IC */
if (!lp8720_is_enabled())
lp8720_enable();
return 0;
}
int lp8720_ldo_voltage(u8 ldo_reg, u8 voltage, u8 delay)
{
u8 val;
int ret;
/* Register V field */
val = voltage & 0x1F;
/* Register T field */
val |= (delay & 0x07) << 5;
ret = lp8720_write(ldo_reg, val);
if (ret)
return ret;
return 0;
}
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