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NetBSD/sys/dev/i2c/act8846.c

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/* $NetBSD: act8846.c,v 1.4 2018/04/30 20:26:09 jmcneill Exp $ */
/*-
* Copyright (c) 2015 Jared D. McNeill <jmcneill@invisible.ca>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
//#define ACT_DEBUG
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: act8846.c,v 1.4 2018/04/30 20:26:09 jmcneill Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <sys/kmem.h>
#include <dev/i2c/i2cvar.h>
#include <dev/i2c/act8846.h>
#define ACT_BATTVOL_STATUS_REG 0x00
#define ACT_THERMAL_CTRL_REG 0x01
#define ACT_DCDC1_BASE_REG 0x10
#define ACT_DCDC2_BASE_REG 0x20
#define ACT_DCDC3_BASE_REG 0x30
#define ACT_DCDC4_BASE_REG 0x40
#define ACT_LDO1_BASE_REG 0x50
#define ACT_LDO2_BASE_REG 0x58
#define ACT_LDO3_BASE_REG 0x60
#define ACT_LDO4_BASE_REG 0x68
#define ACT_LDO5_BASE_REG 0x70
#define ACT_LDO6_BASE_REG 0x80
#define ACT_LDO7_BASE_REG 0x90
#define ACT_LDO8_BASE_REG 0xa0
#define ACT_LDO9_BASE_REG 0xb0
#define ACT_VSET0_OFFSET 0
#define ACT_VSET1_OFFSET 1
#define ACT_DCDC_CTRL_OFFSET 2
#define ACT_LDO_CTRL_OFFSET 1
#define ACT_VSET_VSET __BITS(5,0)
#define ACT_DCDC_CTRL_ON __BIT(7)
#define ACT_LDO_CTRL_ON __BIT(7)
enum act8846_ctrl_type {
ACT_CTRL_DCDC,
ACT_CTRL_LDO,
};
#define ACT_VOLTAGE_MIN 600
#define ACT_VOLTAGE_MAX 3900
struct act8846_ctrl {
device_t c_dev;
const char * c_name;
u_int c_min;
u_int c_max;
uint8_t c_base;
enum act8846_ctrl_type c_type;
};
#define ACT_CTRL(name, base, type) \
{ .c_name = (name), \
.c_min = ACT_VOLTAGE_MIN, .c_max = ACT_VOLTAGE_MAX, \
.c_base = ACT_ ## base ## _BASE_REG, .c_type = (type) }
#define ACT_DCDC(name, base) ACT_CTRL(name, base, ACT_CTRL_DCDC)
#define ACT_LDO(name, base) ACT_CTRL(name, base, ACT_CTRL_LDO)
static const struct act8846_ctrl act8846_ctrls[] = {
ACT_DCDC("DCDC1", DCDC1), /* VCC_DDR */
ACT_DCDC("DCDC2", DCDC2), /* VDD_LOG */
ACT_DCDC("DCDC3", DCDC3), /* VDD_ARM */
ACT_DCDC("DCDC4", DCDC4), /* VCC_IO */
ACT_LDO("LDO1", LDO1), /* VDD_10 */
ACT_LDO("LDO2", LDO2), /* VCC_25 */
ACT_LDO("LDO3", LDO3), /* VCC18_CIF */
ACT_LDO("LDO4", LDO4), /* VCCA_33 */
ACT_LDO("LDO5", LDO5), /* VCC_TOUCH */
ACT_LDO("LDO6", LDO6), /* VCC33 */
ACT_LDO("LDO7", LDO7), /* VCC18_IO */
ACT_LDO("LDO8", LDO8), /* VCC28_CIF */
#if 0
ACT_LDO("LDO9", LDO9), /* VDD_RTC (Always-ON) */
#endif
};
/* From datasheet, Table 5: REGx/VSET[] Output Voltage Setting */
static const u_int act8846_vset[] = {
600, 625, 650, 675, 700, 725, 750, 775,
800, 825, 850, 875, 900, 925, 950, 975,
1000, 1025, 1050, 1075, 1100, 1125, 1150, 1175,
1200, 1250, 1300, 1350, 1400, 1450, 1500, 1550,
1600, 1650, 1700, 1750, 1800, 1850, 1900, 1950,
2000, 2050, 2100, 2150, 2200, 2250, 2300, 2350,
2400, 2500, 2600, 2700, 2800, 2900, 3000, 3100,
3200, 3300, 3400, 3500, 3600, 3700, 3800, 3900
};
struct act8846_softc {
device_t sc_dev;
i2c_tag_t sc_i2c;
i2c_addr_t sc_addr;
u_int sc_nctrl;
struct act8846_ctrl *sc_ctrl;
};
static int act8846_match(device_t, cfdata_t, void *);
static void act8846_attach(device_t, device_t, void *);
static int act8846_read(struct act8846_softc *, uint8_t, uint8_t *);
static int act8846_write(struct act8846_softc *, uint8_t, uint8_t);
static void act8846_print(struct act8846_ctrl *c);
CFATTACH_DECL_NEW(act8846pm, sizeof(struct act8846_softc),
act8846_match, act8846_attach, NULL, NULL);
static int
act8846_match(device_t parent, cfdata_t match, void *aux)
{
struct i2c_attach_args *ia = aux;
if (ia->ia_addr == 0x5a)
return 1;
return 0;
}
static void
act8846_attach(device_t parent, device_t self, void *aux)
{
struct act8846_softc *sc = device_private(self);
struct i2c_attach_args *ia = aux;
u_int n;
sc->sc_dev = self;
sc->sc_i2c = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
aprint_naive("\n");
aprint_normal("\n");
sc->sc_nctrl = __arraycount(act8846_ctrls);
sc->sc_ctrl = kmem_alloc(sizeof(act8846_ctrls), KM_SLEEP);
memcpy(sc->sc_ctrl, act8846_ctrls, sizeof(act8846_ctrls));
for (n = 0; n < sc->sc_nctrl; n++) {
sc->sc_ctrl[n].c_dev = self;
}
for (n = 0; n < sc->sc_nctrl; n++) {
act8846_print(&sc->sc_ctrl[n]);
}
}
static int
act8846_read(struct act8846_softc *sc, uint8_t reg, uint8_t *val)
{
return iic_smbus_read_byte(sc->sc_i2c, sc->sc_addr, reg, val,
cold ? I2C_F_POLL : 0);
}
static int
act8846_write(struct act8846_softc *sc, uint8_t reg, uint8_t val)
{
return iic_smbus_write_byte(sc->sc_i2c, sc->sc_addr, reg, val,
cold ? I2C_F_POLL : 0);
}
static void
act8846_print(struct act8846_ctrl *c)
{
struct act8846_softc *sc = device_private(c->c_dev);
u_int voltage;
bool enabled;
device_printf(sc->sc_dev, "%s:", c->c_name);
if (act8846_get_voltage(c, &voltage)) {
printf(" [??? V]");
} else {
printf(" [%d.%03dV]", voltage / 1000,
voltage % 1000);
}
if (act8846_is_enabled(c, &enabled)) {
printf(" [unknown state]");
} else {
printf(" [%s]", enabled ? "ON" : "OFF");
}
printf("\n");
}
struct act8846_ctrl *
act8846_lookup(device_t dev, const char *name)
{
struct act8846_softc *sc = device_private(dev);
struct act8846_ctrl *c;
u_int n;
for (n = 0; n < sc->sc_nctrl; n++) {
c = &sc->sc_ctrl[n];
if (strcmp(c->c_name, name) == 0) {
return c;
}
}
return NULL;
}
int
act8846_set_voltage(struct act8846_ctrl *c, u_int min, u_int max)
{
struct act8846_softc *sc = device_private(c->c_dev);
uint8_t val;
int error, n;
if (min < c->c_min || min > c->c_max || (min % 25) != 0)
return EINVAL;
for (n = 0; n < __arraycount(act8846_vset); n++) {
if (min >= act8846_vset[n] && max <= act8846_vset[n]) {
break;
}
}
if (n == __arraycount(act8846_vset))
return EINVAL;
val = __SHIFTIN(n, ACT_VSET_VSET);
iic_acquire_bus(sc->sc_i2c, 0);
error = act8846_write(sc, c->c_base + ACT_VSET0_OFFSET, val);
iic_release_bus(sc->sc_i2c, 0);
#ifdef ACT_DEBUG
if (error == 0)
act8846_print(c);
#endif
return error;
}
int
act8846_get_voltage(struct act8846_ctrl *c, u_int *pvol)
{
struct act8846_softc *sc = device_private(c->c_dev);
uint8_t val;
int error;
iic_acquire_bus(sc->sc_i2c, 0);
error = act8846_read(sc, c->c_base + ACT_VSET0_OFFSET, &val);
iic_release_bus(sc->sc_i2c, 0);
if (error)
return error;
*pvol = act8846_vset[__SHIFTOUT(val, ACT_VSET_VSET)];
return 0;
}
int
act8846_is_enabled(struct act8846_ctrl *c, bool *penabled)
{
struct act8846_softc *sc = device_private(c->c_dev);
uint8_t val, regoff, regmask;
int error;
if (c->c_type == ACT_CTRL_DCDC) {
regoff = ACT_DCDC_CTRL_OFFSET;
regmask = ACT_DCDC_CTRL_ON;
} else {
regoff = ACT_LDO_CTRL_OFFSET;
regmask = ACT_LDO_CTRL_ON;
}
iic_acquire_bus(sc->sc_i2c, 0);
error = act8846_read(sc, c->c_base + regoff, &val);
iic_release_bus(sc->sc_i2c, 0);
if (error)
return error;
*penabled = !!(val & regmask);
return 0;
}
int
act8846_enable(struct act8846_ctrl *c)
{
struct act8846_softc *sc = device_private(c->c_dev);
uint8_t val, regoff, regmask;
int error;
if (c->c_type == ACT_CTRL_DCDC) {
regoff = ACT_DCDC_CTRL_OFFSET;
regmask = ACT_DCDC_CTRL_ON;
} else {
regoff = ACT_LDO_CTRL_OFFSET;
regmask = ACT_LDO_CTRL_ON;
}
iic_acquire_bus(sc->sc_i2c, 0);
if ((error = act8846_read(sc, c->c_base + regoff, &val)) != 0)
goto done;
val |= regmask;
error = act8846_write(sc, c->c_base + regoff, val);
done:
iic_release_bus(sc->sc_i2c, 0);
#ifdef ACT_DEBUG
if (error == 0)
act8846_print(c);
#endif
return error;
}
int
act8846_disable(struct act8846_ctrl *c)
{
struct act8846_softc *sc = device_private(c->c_dev);
uint8_t val, regoff, regmask;
int error;
if (c->c_type == ACT_CTRL_DCDC) {
regoff = ACT_DCDC_CTRL_OFFSET;
regmask = ACT_DCDC_CTRL_ON;
} else {
regoff = ACT_LDO_CTRL_OFFSET;
regmask = ACT_LDO_CTRL_ON;
}
iic_acquire_bus(sc->sc_i2c, 0);
if ((error = act8846_read(sc, c->c_base + regoff, &val)) != 0)
goto done;
val &= ~regmask;
error = act8846_write(sc, c->c_base + regoff, val);
done:
iic_release_bus(sc->sc_i2c, 0);
#ifdef ACT_DEBUG
if (error == 0)
act8846_print(c);
#endif
return error;
}
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