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/* $OpenBSD: sypwr.c,v 1.2 2018/08/03 21:07:34 kettenis Exp $ */
/*
* Copyright (c) 2017 Mark Kettenis <kettenis@openbsd.org>
*
* 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/malloc.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_regulator.h>
#include <dev/ofw/fdt.h>
#include <dev/i2c/i2cvar.h>
#define SY8106A_VOUT1_SEL 0x01
#define SY8106A_VOUT1_SEL_I2C (1 << 7)
#define SY8106A_VOUT1_SEL_MASK 0x7f
struct sypwr_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
uint32_t sc_fixed_microvolt;
struct regulator_device sc_rd;
};
int sypwr_match(struct device *, void *, void *);
void sypwr_attach(struct device *, struct device *, void *);
int sypwr_activate(struct device *, int);
struct cfattach sypwr_ca = {
sizeof(struct sypwr_softc), sypwr_match, sypwr_attach,
NULL, sypwr_activate
};
struct cfdriver sypwr_cd = {
NULL, "sypwr", DV_DULL
};
uint8_t sypwr_read(struct sypwr_softc *, int);
void sypwr_write(struct sypwr_softc *, int, uint8_t);
uint32_t sypwr_get_voltage(void *);
int sypwr_set_voltage(void *, uint32_t voltage);
int
sypwr_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, "silergy,sy8106a"));
}
void
sypwr_attach(struct device *parent, struct device *self, void *aux)
{
struct sypwr_softc *sc = (struct sypwr_softc *)self;
struct i2c_attach_args *ia = aux;
int node = *(int *)ia->ia_cookie;
uint8_t reg;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
sc->sc_fixed_microvolt =
OF_getpropint(node, "silergy,fixed-microvolt", 0);
/*
* Only register the regulator if it is under I2C control
* (i.e. initialized by the firmware) or if the device tree
* specifies its fixed voltage. Otherwise we have no idea
* what the current output voltage is, which will confuse the
* regulator framework.
*/
reg = sypwr_read(sc, SY8106A_VOUT1_SEL);
if (reg & SY8106A_VOUT1_SEL_I2C || sc->sc_fixed_microvolt != 0) {
uint32_t voltage;
voltage = sypwr_get_voltage(sc);
printf(": %d.%02d VDC", voltage / 1000000,
(voltage % 1000000) / 10000);
sc->sc_rd.rd_node = node;
sc->sc_rd.rd_cookie = sc;
sc->sc_rd.rd_get_voltage = sypwr_get_voltage;
sc->sc_rd.rd_set_voltage = sypwr_set_voltage;
regulator_register(&sc->sc_rd);
}
printf("\n");
}
int
sypwr_activate(struct device *self, int act)
{
struct sypwr_softc *sc = (struct sypwr_softc *)self;
uint8_t reg;
switch (act) {
case DVACT_POWERDOWN:
/*
* Restore fixed voltage otherwise we might hang after
* a warm reset.
*/
if (sc->sc_fixed_microvolt != 0) {
reg = sypwr_read(sc, SY8106A_VOUT1_SEL);
reg &= ~SY8106A_VOUT1_SEL_I2C;
sypwr_write(sc, SY8106A_VOUT1_SEL, reg);
}
break;
}
return 0;
}
uint8_t
sypwr_read(struct sypwr_softc *sc, int reg)
{
uint8_t cmd = reg;
uint8_t val;
int error;
iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
&cmd, sizeof cmd, &val, sizeof val, I2C_F_POLL);
iic_release_bus(sc->sc_tag, I2C_F_POLL);
if (error) {
printf("error %d\n", error);
printf("%s: can't read register 0x%02x\n",
sc->sc_dev.dv_xname, reg);
val = 0xff;
}
return val;
}
void
sypwr_write(struct sypwr_softc *sc, int reg, uint8_t val)
{
uint8_t cmd = reg;
int error;
iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
error = iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
&cmd, sizeof cmd, &val, sizeof val, I2C_F_POLL);
iic_release_bus(sc->sc_tag, I2C_F_POLL);
if (error) {
printf("%s: can't write register 0x%02x\n",
sc->sc_dev.dv_xname, reg);
}
}
uint32_t
sypwr_get_voltage(void *cookie)
{
struct sypwr_softc *sc = cookie;
uint8_t value;
value = sypwr_read(sc, SY8106A_VOUT1_SEL);
if (value & SY8106A_VOUT1_SEL_I2C)
return 680000 + (value & SY8106A_VOUT1_SEL_MASK) * 10000;
else
return sc->sc_fixed_microvolt;
}
int
sypwr_set_voltage(void *cookie, uint32_t voltage)
{
struct sypwr_softc *sc = cookie;
uint8_t value;
if (voltage < 680000 || voltage > 1950000)
return EINVAL;
value = (voltage - 680000) / 10000;
sypwr_write(sc, SY8106A_VOUT1_SEL, value | SY8106A_VOUT1_SEL_I2C);
return 0;
}
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