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/* $OpenBSD: axp20x.c,v 1.2 2017/07/24 20:35:26 kettenis Exp $ */
/*
* Copyright (c) 2014,2016 Artturi Alm
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/sensors.h>
#include <dev/i2c/i2cvar.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
#include <armv7/armv7/armv7_machdep.h> /* needed for powerdownfn */
/* Power Status Register / Input power status */
#define AXP209_PSR 0x00
#define AXP209_PSR_ACIN (1 << 7) /* ACIN Exists */
#define AXP209_PSR_VBUS (1 << 5) /* VBUS Exists */
/* Shutdown settings, battery detection, and CHGLED Pin control */
#define AXP209_SDR 0x32
#define AXP209_SDR_SHUTDOWN (1 << 7) /* Shutdown Control */
struct axp20x_softc {
struct device sc_dev;
i2c_tag_t sc_i2c;
i2c_addr_t sc_addr;
};
int axp20x_match(struct device *, void *, void *);
void axp20x_attach(struct device *, struct device *, void *);
int axp20x_readb(uint8_t, uint8_t *);
int axp20x_writeb(uint8_t, uint8_t);
void axp20x_shutdown(void);
struct cfattach axppmic_ca = {
sizeof(struct axp20x_softc), axp20x_match, axp20x_attach
};
struct cfdriver axppmic_cd = {
NULL, "axppmic", DV_DULL
};
int
axp20x_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
int node = *(int *)ia->ia_cookie;
return (OF_is_compatible(node, "x-powers,axp152") ||
OF_is_compatible(node, "x-powers,axp209"));
}
void
axp20x_attach(struct device *parent, struct device *self, void *aux)
{
struct axp20x_softc *sc = (struct axp20x_softc *)self;
struct i2c_attach_args *ia = aux;
int node = *(int *)ia->ia_cookie;
uint8_t psr;
sc->sc_i2c = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
if (OF_is_compatible(node, "x-powers,axp152")) {
printf(": AXP152");
} else {
axp20x_readb(AXP209_PSR, &psr);
printf(": AXP209,");
if ((psr & (AXP209_PSR_ACIN | AXP209_PSR_VBUS)) == 0)
printf(" BAT");
else {
if (psr & AXP209_PSR_ACIN)
printf(" ACIN");
if (psr & AXP209_PSR_VBUS)
printf(" VBUS");
}
}
printf("\n");
powerdownfn = axp20x_shutdown;
}
int
axp20x_readb(uint8_t reg, uint8_t *val)
{
struct axp20x_softc *sc = axppmic_cd.cd_devs[0];
int flags = I2C_F_POLL;
int ret;
if (sc == NULL)
return ENXIO;
iic_acquire_bus(sc->sc_i2c, flags);
ret = iic_smbus_read_byte(sc->sc_i2c, sc->sc_addr, reg, val, flags);
iic_release_bus(sc->sc_i2c, flags);
return ret;
}
int
axp20x_writeb(uint8_t reg, uint8_t data)
{
struct axp20x_softc *sc = axppmic_cd.cd_devs[0];
int flags = I2C_F_POLL;
int ret;
if (sc == NULL)
return ENXIO;
iic_acquire_bus(sc->sc_i2c, flags);
ret = iic_smbus_write_byte(sc->sc_i2c, sc->sc_addr, reg, data, flags);
iic_release_bus(sc->sc_i2c, flags);
return ret;
}
void
axp20x_shutdown(void)
{
axp20x_writeb(AXP209_SDR, AXP209_SDR_SHUTDOWN);
}
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