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/*-
* Copyright (c) 2005 Hans Petter Selasky
* 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 AUTHOR 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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/acpica/acpi_smbat.c 237822 2012-06-29 21:24:56Z jhb $");
#include "opt_acpi.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <contrib/dev/acpica/include/acpi.h>
#include <dev/acpica/acpivar.h>
#include <dev/acpica/acpiio.h>
#include <dev/acpica/acpi_smbus.h>
/* Transactions have failed after 500 ms. */
#define SMBUS_TIMEOUT 50
struct acpi_smbat_softc {
uint8_t sb_base_addr;
device_t ec_dev;
struct acpi_bif bif;
struct acpi_bst bst;
struct timespec bif_lastupdated;
struct timespec bst_lastupdated;
};
static int acpi_smbat_probe(device_t dev);
static int acpi_smbat_attach(device_t dev);
static int acpi_smbat_shutdown(device_t dev);
static int acpi_smbat_info_expired(struct timespec *lastupdated);
static void acpi_smbat_info_updated(struct timespec *lastupdated);
static int acpi_smbat_get_bif(device_t dev, struct acpi_bif *bif);
static int acpi_smbat_get_bst(device_t dev, struct acpi_bst *bst);
ACPI_SERIAL_DECL(smbat, "ACPI Smart Battery");
SYSCTL_NODE(_debug_acpi, OID_AUTO, batt, CTLFLAG_RD, NULL, "Battery debugging");
/* On some laptops with smart batteries, enabling battery monitoring
* software causes keystrokes from atkbd to be lost. This has also been
* reported on Linux, and is apparently due to the keyboard and I2C line
* for the battery being routed through the same chip. Whether that's
* accurate or not, adding extra sleeps to the status checking code
* causes the problem to go away.
*
* If you experience that problem, try a value of 10ms and move up
* from there.
*/
static int batt_sleep_ms;
SYSCTL_INT(_debug_acpi_batt, OID_AUTO, batt_sleep_ms, CTLFLAG_RW, &batt_sleep_ms, 0,
"Sleep during battery status updates to prevent keystroke loss.");
static device_method_t acpi_smbat_methods[] = {
/* device interface */
DEVMETHOD(device_probe, acpi_smbat_probe),
DEVMETHOD(device_attach, acpi_smbat_attach),
DEVMETHOD(device_shutdown, acpi_smbat_shutdown),
/* ACPI battery interface */
DEVMETHOD(acpi_batt_get_status, acpi_smbat_get_bst),
DEVMETHOD(acpi_batt_get_info, acpi_smbat_get_bif),
{0, 0}
};
static driver_t acpi_smbat_driver = {
"battery",
acpi_smbat_methods,
sizeof(struct acpi_smbat_softc),
};
static devclass_t acpi_smbat_devclass;
DRIVER_MODULE(acpi_smbat, acpi, acpi_smbat_driver, acpi_smbat_devclass, 0, 0);
MODULE_DEPEND(acpi_smbat, acpi, 1, 1, 1);
static int
acpi_smbat_probe(device_t dev)
{
static char *smbat_ids[] = {"ACPI0001", "ACPI0005", NULL};
ACPI_STATUS status;
if (acpi_disabled("smbat") ||
ACPI_ID_PROBE(device_get_parent(dev), dev, smbat_ids) == NULL)
return (ENXIO);
status = AcpiEvaluateObject(acpi_get_handle(dev), "_EC", NULL, NULL);
if (ACPI_FAILURE(status))
return (ENXIO);
device_set_desc(dev, "ACPI Smart Battery");
return (0);
}
static int
acpi_smbat_attach(device_t dev)
{
struct acpi_smbat_softc *sc;
uint32_t base;
sc = device_get_softc(dev);
if (ACPI_FAILURE(acpi_GetInteger(acpi_get_handle(dev), "_EC", &base))) {
device_printf(dev, "cannot get EC base address\n");
return (ENXIO);
}
sc->sb_base_addr = (base >> 8) & 0xff;
/* XXX Only works with one EC, but nearly all systems only have one. */
sc->ec_dev = devclass_get_device(devclass_find("acpi_ec"), 0);
if (sc->ec_dev == NULL) {
device_printf(dev, "cannot find EC device\n");
return (ENXIO);
}
timespecclear(&sc->bif_lastupdated);
timespecclear(&sc->bst_lastupdated);
if (acpi_battery_register(dev) != 0) {
device_printf(dev, "cannot register battery\n");
return (ENXIO);
}
return (0);
}
static int
acpi_smbat_shutdown(device_t dev)
{
acpi_battery_remove(dev);
return (0);
}
static int
acpi_smbat_info_expired(struct timespec *lastupdated)
{
struct timespec curtime;
ACPI_SERIAL_ASSERT(smbat);
if (lastupdated == NULL)
return (TRUE);
if (!timespecisset(lastupdated))
return (TRUE);
getnanotime(&curtime);
timespecsub(&curtime, lastupdated);
return (curtime.tv_sec < 0 ||
curtime.tv_sec > acpi_battery_get_info_expire());
}
static void
acpi_smbat_info_updated(struct timespec *lastupdated)
{
ACPI_SERIAL_ASSERT(smbat);
if (lastupdated != NULL)
getnanotime(lastupdated);
}
static int
acpi_smbus_read_2(struct acpi_smbat_softc *sc, uint8_t addr, uint8_t cmd,
uint16_t *ptr)
{
int error, to;
UINT64 val;
ACPI_SERIAL_ASSERT(smbat);
if (batt_sleep_ms)
AcpiOsSleep(batt_sleep_ms);
val = addr;
error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_ADDR,
val, 1);
if (error)
goto out;
val = cmd;
error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_CMD,
val, 1);
if (error)
goto out;
val = 0x09; /* | 0x80 if PEC */
error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
val, 1);
if (error)
goto out;
if (batt_sleep_ms)
AcpiOsSleep(batt_sleep_ms);
for (to = SMBUS_TIMEOUT; to != 0; to--) {
error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
&val, 1);
if (error)
goto out;
if (val == 0)
break;
AcpiOsSleep(10);
}
if (to == 0) {
error = ETIMEDOUT;
goto out;
}
error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_STS, &val, 1);
if (error)
goto out;
if (val & SMBUS_STS_MASK) {
printf("%s: AE_ERROR 0x%x\n",
__FUNCTION__, (int)(val & SMBUS_STS_MASK));
error = EIO;
goto out;
}
error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_DATA,
&val, 2);
if (error)
goto out;
*ptr = val;
out:
return (error);
}
static int
acpi_smbus_read_multi_1(struct acpi_smbat_softc *sc, uint8_t addr, uint8_t cmd,
uint8_t *ptr, uint16_t len)
{
UINT64 val;
uint8_t to;
int error;
ACPI_SERIAL_ASSERT(smbat);
if (batt_sleep_ms)
AcpiOsSleep(batt_sleep_ms);
val = addr;
error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_ADDR,
val, 1);
if (error)
goto out;
val = cmd;
error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_CMD,
val, 1);
if (error)
goto out;
val = 0x0B /* | 0x80 if PEC */ ;
error = ACPI_EC_WRITE(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
val, 1);
if (error)
goto out;
if (batt_sleep_ms)
AcpiOsSleep(batt_sleep_ms);
for (to = SMBUS_TIMEOUT; to != 0; to--) {
error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_PRTCL,
&val, 1);
if (error)
goto out;
if (val == 0)
break;
AcpiOsSleep(10);
}
if (to == 0) {
error = ETIMEDOUT;
goto out;
}
error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_STS, &val, 1);
if (error)
goto out;
if (val & SMBUS_STS_MASK) {
printf("%s: AE_ERROR 0x%x\n",
__FUNCTION__, (int)(val & SMBUS_STS_MASK));
error = EIO;
goto out;
}
/* get length */
error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_BCNT,
&val, 1);
if (error)
goto out;
val = (val & 0x1f) + 1;
bzero(ptr, len);
if (len > val)
len = val;
if (batt_sleep_ms)
AcpiOsSleep(batt_sleep_ms);
while (len--) {
error = ACPI_EC_READ(sc->ec_dev, sc->sb_base_addr + SMBUS_DATA
+ len, &val, 1);
if (error)
goto out;
ptr[len] = val;
if (batt_sleep_ms)
AcpiOsSleep(batt_sleep_ms);
}
out:
return (error);
}
static int
acpi_smbat_get_bst(device_t dev, struct acpi_bst *bst)
{
struct acpi_smbat_softc *sc;
int error;
uint32_t cap_units, factor;
int16_t val;
uint8_t addr;
ACPI_SERIAL_BEGIN(smbat);
addr = SMBATT_ADDRESS;
error = ENXIO;
sc = device_get_softc(dev);
if (!acpi_smbat_info_expired(&sc->bst_lastupdated)) {
error = 0;
goto out;
}
if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_BATTERY_MODE, &val))
goto out;
if (val & SMBATT_BM_CAPACITY_MODE) {
factor = 10;
cap_units = ACPI_BIF_UNITS_MW;
} else {
factor = 1;
cap_units = ACPI_BIF_UNITS_MA;
}
/* get battery status */
if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_BATTERY_STATUS, &val))
goto out;
sc->bst.state = 0;
if (val & SMBATT_BS_DISCHARGING)
sc->bst.state |= ACPI_BATT_STAT_DISCHARG;
if (val & SMBATT_BS_REMAINING_CAPACITY_ALARM)
sc->bst.state |= ACPI_BATT_STAT_CRITICAL;
/*
* If the rate is negative, it is discharging. Otherwise,
* it is charging.
*/
if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_CURRENT, &val))
goto out;
if (val > 0) {
sc->bst.rate = val * factor;
sc->bst.state &= ~SMBATT_BS_DISCHARGING;
sc->bst.state |= ACPI_BATT_STAT_CHARGING;
} else if (val < 0)
sc->bst.rate = (-val) * factor;
else
sc->bst.rate = 0;
if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_REMAINING_CAPACITY, &val))
goto out;
sc->bst.cap = val * factor;
if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_VOLTAGE, &val))
goto out;
sc->bst.volt = val;
acpi_smbat_info_updated(&sc->bst_lastupdated);
error = 0;
out:
if (error == 0)
memcpy(bst, &sc->bst, sizeof(sc->bst));
ACPI_SERIAL_END(smbat);
return (error);
}
static int
acpi_smbat_get_bif(device_t dev, struct acpi_bif *bif)
{
struct acpi_smbat_softc *sc;
int error;
uint32_t factor;
uint16_t val;
uint8_t addr;
ACPI_SERIAL_BEGIN(smbat);
addr = SMBATT_ADDRESS;
error = ENXIO;
sc = device_get_softc(dev);
if (!acpi_smbat_info_expired(&sc->bif_lastupdated)) {
error = 0;
goto out;
}
if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_BATTERY_MODE, &val))
goto out;
if (val & SMBATT_BM_CAPACITY_MODE) {
factor = 10;
sc->bif.units = ACPI_BIF_UNITS_MW;
} else {
factor = 1;
sc->bif.units = ACPI_BIF_UNITS_MA;
}
if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_DESIGN_CAPACITY, &val))
goto out;
sc->bif.dcap = val * factor;
if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_FULL_CHARGE_CAPACITY, &val))
goto out;
sc->bif.lfcap = val * factor;
sc->bif.btech = 1; /* secondary (rechargeable) */
if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_DESIGN_VOLTAGE, &val))
goto out;
sc->bif.dvol = val;
sc->bif.wcap = sc->bif.dcap / 10;
sc->bif.lcap = sc->bif.dcap / 10;
sc->bif.gra1 = factor; /* not supported */
sc->bif.gra2 = factor; /* not supported */
if (acpi_smbus_read_multi_1(sc, addr, SMBATT_CMD_DEVICE_NAME,
sc->bif.model, sizeof(sc->bif.model)))
goto out;
if (acpi_smbus_read_2(sc, addr, SMBATT_CMD_SERIAL_NUMBER, &val))
goto out;
snprintf(sc->bif.serial, sizeof(sc->bif.serial), "0x%04x", val);
if (acpi_smbus_read_multi_1(sc, addr, SMBATT_CMD_DEVICE_CHEMISTRY,
sc->bif.type, sizeof(sc->bif.type)))
goto out;
if (acpi_smbus_read_multi_1(sc, addr, SMBATT_CMD_MANUFACTURER_DATA,
sc->bif.oeminfo, sizeof(sc->bif.oeminfo)))
goto out;
/* XXX check if device was replugged during read? */
acpi_smbat_info_updated(&sc->bif_lastupdated);
error = 0;
out:
if (error == 0)
memcpy(bif, &sc->bif, sizeof(sc->bif));
ACPI_SERIAL_END(smbat);
return (error);
}