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/*
* (C) Copyright 2012
* Henrik Nordstrom <henrik@henriknordstrom.net>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <i2c.h>
#include <axp209.h>
enum axp209_reg {
AXP209_POWER_STATUS = 0x00,
AXP209_CHIP_VERSION = 0x03,
AXP209_DCDC2_VOLTAGE = 0x23,
AXP209_DCDC3_VOLTAGE = 0x27,
AXP209_LDO24_VOLTAGE = 0x28,
AXP209_LDO3_VOLTAGE = 0x29,
AXP209_IRQ_STATUS5 = 0x4c,
AXP209_SHUTDOWN = 0x32,
AXP209_GPIO0_CTRL = 0x90,
AXP209_GPIO1_CTRL = 0x92,
AXP209_GPIO2_CTRL = 0x93,
AXP209_GPIO_STATE = 0x94,
AXP209_GPIO3_CTRL = 0x95,
};
#define AXP209_POWER_STATUS_ON_BY_DC (1 << 0)
#define AXP209_IRQ5_PEK_UP (1 << 6)
#define AXP209_IRQ5_PEK_DOWN (1 << 5)
#define AXP209_POWEROFF (1 << 7)
#define AXP209_GPIO_OUTPUT_LOW 0x00 /* Drive pin low */
#define AXP209_GPIO_OUTPUT_HIGH 0x01 /* Drive pin high */
#define AXP209_GPIO_INPUT 0x02 /* Float pin */
/* GPIO3 is different from the others */
#define AXP209_GPIO3_OUTPUT_LOW 0x00 /* Drive pin low, Output mode */
#define AXP209_GPIO3_OUTPUT_HIGH 0x02 /* Float pin, Output mode */
#define AXP209_GPIO3_INPUT 0x06 /* Float pin, Input mode */
static int axp209_write(enum axp209_reg reg, u8 val)
{
return i2c_write(0x34, reg, 1, &val, 1);
}
static int axp209_read(enum axp209_reg reg, u8 *val)
{
return i2c_read(0x34, reg, 1, val, 1);
}
static u8 axp209_mvolt_to_cfg(int mvolt, int min, int max, int div)
{
if (mvolt < min)
mvolt = min;
else if (mvolt > max)
mvolt = max;
return (mvolt - min) / div;
}
int axp209_set_dcdc2(int mvolt)
{
int rc;
u8 cfg, current;
cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25);
/* Do we really need to be this gentle? It has built-in voltage slope */
while ((rc = axp209_read(AXP209_DCDC2_VOLTAGE, ¤t)) == 0 &&
current != cfg) {
if (current < cfg)
current++;
else
current--;
rc = axp209_write(AXP209_DCDC2_VOLTAGE, current);
if (rc)
break;
}
return rc;
}
int axp209_set_dcdc3(int mvolt)
{
u8 cfg = axp209_mvolt_to_cfg(mvolt, 700, 3500, 25);
return axp209_write(AXP209_DCDC3_VOLTAGE, cfg);
}
int axp209_set_ldo2(int mvolt)
{
int rc;
u8 cfg, reg;
cfg = axp209_mvolt_to_cfg(mvolt, 1800, 3300, 100);
rc = axp209_read(AXP209_LDO24_VOLTAGE, ®);
if (rc)
return rc;
/* LDO2 configuration is in upper 4 bits */
reg = (reg & 0x0f) | (cfg << 4);
return axp209_write(AXP209_LDO24_VOLTAGE, reg);
}
int axp209_set_ldo3(int mvolt)
{
u8 cfg;
if (mvolt == -1)
cfg = 0x80; /* determined by LDO3IN pin */
else
cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25);
return axp209_write(AXP209_LDO3_VOLTAGE, cfg);
}
int axp209_set_ldo4(int mvolt)
{
int rc;
static const int vindex[] = {
1250, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2500,
2700, 2800, 3000, 3100, 3200, 3300
};
u8 cfg, reg;
/* Translate mvolt to register cfg value, requested <= selected */
for (cfg = 15; vindex[cfg] > mvolt && cfg > 0; cfg--);
rc = axp209_read(AXP209_LDO24_VOLTAGE, ®);
if (rc)
return rc;
/* LDO4 configuration is in lower 4 bits */
reg = (reg & 0xf0) | (cfg << 0);
return axp209_write(AXP209_LDO24_VOLTAGE, reg);
}
int axp209_init(void)
{
u8 ver;
int rc;
rc = axp209_read(AXP209_CHIP_VERSION, &ver);
if (rc)
return rc;
/* Low 4 bits is chip version */
ver &= 0x0f;
if (ver != 0x1)
return -1;
return 0;
}
int axp209_poweron_by_dc(void)
{
u8 v;
if (axp209_read(AXP209_POWER_STATUS, &v))
return 0;
return (v & AXP209_POWER_STATUS_ON_BY_DC);
}
int axp209_power_button(void)
{
u8 v;
if (axp209_read(AXP209_IRQ_STATUS5, &v))
return 0;
axp209_write(AXP209_IRQ_STATUS5, AXP209_IRQ5_PEK_DOWN);
return v & AXP209_IRQ5_PEK_DOWN;
}
static u8 axp209_get_gpio_ctrl_reg(unsigned int pin)
{
switch (pin) {
case 0: return AXP209_GPIO0_CTRL;
case 1: return AXP209_GPIO1_CTRL;
case 2: return AXP209_GPIO2_CTRL;
case 3: return AXP209_GPIO3_CTRL;
}
return 0;
}
int axp_gpio_direction_input(unsigned int pin)
{
u8 reg = axp209_get_gpio_ctrl_reg(pin);
/* GPIO3 is "special" */
u8 val = (pin == 3) ? AXP209_GPIO3_INPUT : AXP209_GPIO_INPUT;
return axp209_write(reg, val);
}
int axp_gpio_direction_output(unsigned int pin, unsigned int val)
{
u8 reg = axp209_get_gpio_ctrl_reg(pin);
if (val) {
val = (pin == 3) ? AXP209_GPIO3_OUTPUT_HIGH :
AXP209_GPIO_OUTPUT_HIGH;
} else {
val = (pin == 3) ? AXP209_GPIO3_OUTPUT_LOW :
AXP209_GPIO_OUTPUT_LOW;
}
return axp209_write(reg, val);
}
int axp_gpio_get_value(unsigned int pin)
{
u8 val, mask;
int rc;
if (pin == 3) {
rc = axp209_read(AXP209_GPIO3_CTRL, &val);
mask = 1;
} else {
rc = axp209_read(AXP209_GPIO_STATE, &val);
mask = 1 << (pin + 4);
}
if (rc)
return rc;
return (val & mask) ? 1 : 0;
}
int axp_gpio_set_value(unsigned int pin, unsigned int val)
{
return axp_gpio_direction_output(pin, val);
}
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