168 lines
3.0 KiB
C
168 lines
3.0 KiB
C
/*
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* (C) Copyright 2012
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* Henrik Nordstrom <henrik@henriknordstrom.net>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <i2c.h>
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#include <axp209.h>
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enum axp209_reg {
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AXP209_POWER_STATUS = 0x00,
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AXP209_CHIP_VERSION = 0x03,
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AXP209_DCDC2_VOLTAGE = 0x23,
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AXP209_DCDC3_VOLTAGE = 0x27,
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AXP209_LDO24_VOLTAGE = 0x28,
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AXP209_LDO3_VOLTAGE = 0x29,
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AXP209_IRQ_STATUS5 = 0x4c,
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AXP209_SHUTDOWN = 0x32,
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};
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#define AXP209_POWER_STATUS_ON_BY_DC (1 << 0)
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#define AXP209_IRQ5_PEK_UP (1 << 6)
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#define AXP209_IRQ5_PEK_DOWN (1 << 5)
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#define AXP209_POWEROFF (1 << 7)
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static int axp209_write(enum axp209_reg reg, u8 val)
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{
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return i2c_write(0x34, reg, 1, &val, 1);
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}
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static int axp209_read(enum axp209_reg reg, u8 *val)
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{
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return i2c_read(0x34, reg, 1, val, 1);
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}
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static u8 axp209_mvolt_to_cfg(int mvolt, int min, int max, int div)
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{
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if (mvolt < min)
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mvolt = min;
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else if (mvolt > max)
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mvolt = max;
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return (mvolt - min) / div;
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}
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int axp209_set_dcdc2(int mvolt)
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{
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int rc;
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u8 cfg, current;
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cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25);
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/* Do we really need to be this gentle? It has built-in voltage slope */
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while ((rc = axp209_read(AXP209_DCDC2_VOLTAGE, ¤t)) == 0 &&
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current != cfg) {
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if (current < cfg)
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current++;
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else
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current--;
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rc = axp209_write(AXP209_DCDC2_VOLTAGE, current);
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if (rc)
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break;
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}
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return rc;
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}
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int axp209_set_dcdc3(int mvolt)
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{
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u8 cfg = axp209_mvolt_to_cfg(mvolt, 700, 3500, 25);
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return axp209_write(AXP209_DCDC3_VOLTAGE, cfg);
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}
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int axp209_set_ldo2(int mvolt)
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{
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int rc;
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u8 cfg, reg;
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cfg = axp209_mvolt_to_cfg(mvolt, 1800, 3300, 100);
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rc = axp209_read(AXP209_LDO24_VOLTAGE, ®);
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if (rc)
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return rc;
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/* LDO2 configuration is in upper 4 bits */
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reg = (reg & 0x0f) | (cfg << 4);
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return axp209_write(AXP209_LDO24_VOLTAGE, reg);
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}
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int axp209_set_ldo3(int mvolt)
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{
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u8 cfg;
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if (mvolt == -1)
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cfg = 0x80; /* determined by LDO3IN pin */
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else
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cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25);
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return axp209_write(AXP209_LDO3_VOLTAGE, cfg);
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}
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int axp209_set_ldo4(int mvolt)
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{
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int rc;
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static const int vindex[] = {
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1250, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2500,
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2700, 2800, 3000, 3100, 3200, 3300
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};
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u8 cfg, reg;
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/* Translate mvolt to register cfg value, requested <= selected */
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for (cfg = 15; vindex[cfg] > mvolt && cfg > 0; cfg--);
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rc = axp209_read(AXP209_LDO24_VOLTAGE, ®);
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if (rc)
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return rc;
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/* LDO4 configuration is in lower 4 bits */
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reg = (reg & 0xf0) | (cfg << 0);
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return axp209_write(AXP209_LDO24_VOLTAGE, reg);
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}
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int axp209_init(void)
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{
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u8 ver;
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int rc;
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rc = axp209_read(AXP209_CHIP_VERSION, &ver);
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if (rc)
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return rc;
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/* Low 4 bits is chip version */
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ver &= 0x0f;
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if (ver != 0x1)
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return -1;
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return 0;
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}
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int axp209_poweron_by_dc(void)
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{
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u8 v;
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if (axp209_read(AXP209_POWER_STATUS, &v))
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return 0;
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return (v & AXP209_POWER_STATUS_ON_BY_DC);
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}
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int axp209_power_button(void)
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{
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u8 v;
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if (axp209_read(AXP209_IRQ_STATUS5, &v))
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return 0;
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axp209_write(AXP209_IRQ_STATUS5, AXP209_IRQ5_PEK_DOWN);
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return v & AXP209_IRQ5_PEK_DOWN;
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}
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