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NetBSD/sys/dev/i2c/tps65950.c
thorpej aa41e9922c More cleanup to i2c autoconfiguration: 
- Get all of the drivers onto the new match quality constants.
- Introduce a new helper function, iic_use_direct_match(), that has
  all of the logic for direct-config matching.  If it returns true,
  the driver returns the match result (which may be 0).  If it returns
  false, the driver does indirect-config matching.
- iic_compat_match() now returns a weighted match quality; matches to
  lower-indexed "compatible" device property are more-specific matches,
  and return a better match quality accordingly.
2018-06-16 21:22:13 +00:00

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/* $NetBSD: tps65950.c,v 1.6 2018/06/16 21:22:13 thorpej Exp $ */
/*-
* Copyright (c) 2012 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.
*/
/*
* TI TPS65950 OMAP Power Management and System Companion Device
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tps65950.c,v 1.6 2018/06/16 21:22:13 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <sys/kmem.h>
#include <sys/sysctl.h>
#include <sys/wdog.h>
#include <dev/i2c/i2cvar.h>
#include <dev/clock_subr.h>
#include <dev/sysmon/sysmonvar.h>
/* Default watchdog period, in seconds */
#ifndef TPS65950_WDOG_DEFAULT_PERIOD
#define TPS65950_WDOG_DEFAULT_PERIOD 30
#endif
/* I2C Bus Addressing */
#define TPS65950_ADDR_ID1 0x48 /* GP */
#define TPS65950_ADDR_ID2 0x49 /* GP */
#define TPS65950_ADDR_ID3 0x4a /* GP */
#define TPS65950_ADDR_ID4 0x4b /* GP */
#define TPS65950_ADDR_ID5 0x12 /* SmartReflex */
/* ID2 */
#define TPS65950_ID2_IDCODE_7_0 0x85
#define TPS65950_ID2_IDCODE_15_8 0x86
#define TPS65950_ID2_IDCODE_23_16 0x87
#define TPS65950_ID2_IDCODE_31_24 0x88
#define TPS65950_ID2_UNLOCK_TEST_REG 0x97
#define TPS65950_ID2_UNLOCK_TEST_REG_MAGIC 0x49
/* ID3 */
#define TPS65950_LED_BASE 0xee
#define TPS65950_ID3_REG_LED (TPS65950_LED_BASE + 0)
#define TPS65950_ID3_REG_LED_LEDAON __BIT(0)
#define TPS65950_ID3_REG_LED_LEDBON __BIT(1)
#define TPS65950_ID3_REG_LED_LEDAPWM __BIT(4)
#define TPS65950_ID3_REG_LED_LEDBPWM __BIT(5)
/* ID4 */
#define TPS65950_PM_RECEIVER_BASE 0x5b
#define TPS65950_ID4_REG_WATCHDOG_CFG (TPS65950_PM_RECEIVER_BASE + 3)
#define TPS65950_RTC_BASE 0x1c
#define TPS65950_ID4_REG_SECONDS_REG (TPS65950_RTC_BASE + 0)
#define TPS65950_ID4_REG_MINUTES_REG (TPS65950_RTC_BASE + 1)
#define TPS65950_ID4_REG_HOURS_REG (TPS65950_RTC_BASE + 2)
#define TPS65950_ID4_REG_DAYS_REG (TPS65950_RTC_BASE + 3)
#define TPS65950_ID4_REG_MONTHS_REG (TPS65950_RTC_BASE + 4)
#define TPS65950_ID4_REG_YEARS_REG (TPS65950_RTC_BASE + 5)
#define TPS65950_ID4_REG_WEEKS_REG (TPS65950_RTC_BASE + 6)
#define TPS65950_ID4_REG_RTC_CTRL_REG (TPS65950_RTC_BASE + 13)
#define TPS65950_ID4_REG_RTC_CTRL_REG_GET_TIME __BIT(6)
#define TPS65950_ID4_REG_RTC_CTRL_REG_STOP_RTC __BIT(1)
struct tps65950_softc {
device_t sc_dev;
i2c_tag_t sc_i2c;
i2c_addr_t sc_addr;
struct sysctllog *sc_sysctllog;
struct sysmon_wdog sc_smw;
struct todr_chip_handle sc_todr;
};
static int tps65950_match(device_t, cfdata_t, void *);
static void tps65950_attach(device_t, device_t, void *);
static int tps65950_read_1(struct tps65950_softc *, uint8_t, uint8_t *);
static int tps65950_write_1(struct tps65950_softc *, uint8_t, uint8_t);
static void tps65950_sysctl_attach(struct tps65950_softc *);
static void tps65950_rtc_attach(struct tps65950_softc *);
static int tps65950_rtc_enable(struct tps65950_softc *, bool);
static int tps65950_rtc_gettime(todr_chip_handle_t, struct clock_ymdhms *);
static int tps65950_rtc_settime(todr_chip_handle_t, struct clock_ymdhms *);
static void tps65950_wdog_attach(struct tps65950_softc *);
static int tps65950_wdog_setmode(struct sysmon_wdog *);
static int tps65950_wdog_tickle(struct sysmon_wdog *);
CFATTACH_DECL_NEW(tps65950pm, sizeof(struct tps65950_softc),
tps65950_match, tps65950_attach, NULL, NULL);
static int
tps65950_match(device_t parent, cfdata_t match, void *aux)
{
struct i2c_attach_args *ia = aux;
switch (ia->ia_addr) {
case TPS65950_ADDR_ID1:
case TPS65950_ADDR_ID2:
case TPS65950_ADDR_ID3:
case TPS65950_ADDR_ID4:
case TPS65950_ADDR_ID5:
return I2C_MATCH_ADDRESS_ONLY;
default:
return 0;
}
}
static void
tps65950_attach(device_t parent, device_t self, void *aux)
{
struct tps65950_softc *sc = device_private(self);
struct i2c_attach_args *ia = aux;
uint8_t buf[4];
uint32_t idcode;
sc->sc_dev = self;
sc->sc_i2c = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
aprint_naive("\n");
switch (sc->sc_addr) {
case TPS65950_ADDR_ID2:
memset(buf, 0, sizeof(buf));
iic_acquire_bus(sc->sc_i2c, 0);
tps65950_write_1(sc, TPS65950_ID2_UNLOCK_TEST_REG,
TPS65950_ID2_UNLOCK_TEST_REG_MAGIC);
tps65950_read_1(sc, TPS65950_ID2_IDCODE_7_0, &buf[0]);
tps65950_read_1(sc, TPS65950_ID2_IDCODE_15_8, &buf[1]);
tps65950_read_1(sc, TPS65950_ID2_IDCODE_23_16, &buf[2]);
tps65950_read_1(sc, TPS65950_ID2_IDCODE_31_24, &buf[3]);
iic_release_bus(sc->sc_i2c, 0);
idcode = (buf[0] << 0) | (buf[1] << 8) |
(buf[2] << 16) | (buf[3] << 24);
aprint_normal(": IDCODE %08X\n", idcode);
break;
case TPS65950_ADDR_ID3:
aprint_normal(": LED\n");
tps65950_sysctl_attach(sc);
break;
case TPS65950_ADDR_ID4:
aprint_normal(": RTC, WATCHDOG\n");
tps65950_rtc_attach(sc);
tps65950_wdog_attach(sc);
break;
default:
aprint_normal("\n");
break;
}
}
static int
tps65950_read_1(struct tps65950_softc *sc, uint8_t reg, uint8_t *val)
{
return iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, sc->sc_addr,
&reg, sizeof(reg), val, sizeof(*val), 0);
}
static int
tps65950_write_1(struct tps65950_softc *sc, uint8_t reg, uint8_t val)
{
uint8_t data[2] = { reg, val };
return iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
NULL, 0, data, sizeof(data), 0);
}
static int
tps65950_sysctl_leda(SYSCTLFN_ARGS)
{
struct tps65950_softc *sc;
struct sysctlnode node;
uint8_t val;
u_int leda;
int error;
node = *rnode;
sc = node.sysctl_data;
iic_acquire_bus(sc->sc_i2c, 0);
error = tps65950_read_1(sc, TPS65950_ID3_REG_LED, &val);
iic_release_bus(sc->sc_i2c, 0);
if (error)
return error;
leda = (val & TPS65950_ID3_REG_LED_LEDAON) ? 1 : 0;
node.sysctl_data = &leda;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return error;
if (leda)
val |= (TPS65950_ID3_REG_LED_LEDAON|TPS65950_ID3_REG_LED_LEDAPWM);
else
val &= ~(TPS65950_ID3_REG_LED_LEDAON|TPS65950_ID3_REG_LED_LEDAPWM);
iic_acquire_bus(sc->sc_i2c, 0);
error = tps65950_write_1(sc, TPS65950_ID3_REG_LED, val);
iic_release_bus(sc->sc_i2c, 0);
return error;
}
static int
tps65950_sysctl_ledb(SYSCTLFN_ARGS)
{
struct tps65950_softc *sc;
struct sysctlnode node;
uint8_t val;
u_int ledb;
int error;
node = *rnode;
sc = node.sysctl_data;
iic_acquire_bus(sc->sc_i2c, 0);
error = tps65950_read_1(sc, TPS65950_ID3_REG_LED, &val);
iic_release_bus(sc->sc_i2c, 0);
if (error)
return error;
ledb = (val & TPS65950_ID3_REG_LED_LEDBON) ? 1 : 0;
node.sysctl_data = &ledb;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return error;
if (ledb)
val |= (TPS65950_ID3_REG_LED_LEDBON|TPS65950_ID3_REG_LED_LEDBPWM);
else
val &= ~(TPS65950_ID3_REG_LED_LEDBON|TPS65950_ID3_REG_LED_LEDBPWM);
iic_acquire_bus(sc->sc_i2c, 0);
error = tps65950_write_1(sc, TPS65950_ID3_REG_LED, val);
iic_release_bus(sc->sc_i2c, 0);
return error;
}
static void
tps65950_sysctl_attach(struct tps65950_softc *sc)
{
struct sysctllog **log = &sc->sc_sysctllog;
const struct sysctlnode *rnode, *cnode;
int error;
error = sysctl_createv(log, 0, NULL, &rnode, CTLFLAG_PERMANENT,
CTLTYPE_NODE, "tps65950", SYSCTL_DESCR("tps65950 control"),
NULL, 0, NULL, 0, CTL_HW, CTL_CREATE, CTL_EOL);
if (error)
return;
error = sysctl_createv(log, 0, &rnode, &cnode,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "leda",
SYSCTL_DESCR("LEDA enable"), tps65950_sysctl_leda, 0,
(void *)sc, 0, CTL_CREATE, CTL_EOL);
if (error)
return;
error = sysctl_createv(log, 0, &rnode, &cnode,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "ledb",
SYSCTL_DESCR("LEDB enable"), tps65950_sysctl_ledb, 0,
(void *)sc, 0, CTL_CREATE, CTL_EOL);
if (error)
return;
}
static void
tps65950_rtc_attach(struct tps65950_softc *sc)
{
sc->sc_todr.todr_gettime_ymdhms = tps65950_rtc_gettime;
sc->sc_todr.todr_settime_ymdhms = tps65950_rtc_settime;
sc->sc_todr.cookie = sc;
todr_attach(&sc->sc_todr);
iic_acquire_bus(sc->sc_i2c, 0);
tps65950_rtc_enable(sc, true);
iic_release_bus(sc->sc_i2c, 0);
}
static int
tps65950_rtc_enable(struct tps65950_softc *sc, bool enable)
{
uint8_t rtc_ctrl;
int error;
error = tps65950_read_1(sc, TPS65950_ID4_REG_RTC_CTRL_REG, &rtc_ctrl);
if (error)
return error;
if (enable) {
rtc_ctrl |= TPS65950_ID4_REG_RTC_CTRL_REG_STOP_RTC;
} else {
rtc_ctrl &= ~TPS65950_ID4_REG_RTC_CTRL_REG_STOP_RTC;
}
return tps65950_write_1(sc, TPS65950_ID4_REG_RTC_CTRL_REG, rtc_ctrl);
}
#define RTC_READ(reg, var) \
do { \
tps65950_write_1(sc, TPS65950_ID4_REG_RTC_CTRL_REG, \
TPS65950_ID4_REG_RTC_CTRL_REG_GET_TIME); \
if ((error = tps65950_read_1(sc, (reg), &(var))) != 0) { \
iic_release_bus(sc->sc_i2c, 0); \
return error; \
} \
} while (0)
#define RTC_WRITE(reg, val) \
do { \
if ((error = tps65950_write_1(sc, (reg), (val))) != 0) { \
iic_release_bus(sc->sc_i2c, 0); \
return error; \
} \
} while (0)
static int
tps65950_rtc_gettime(todr_chip_handle_t tch, struct clock_ymdhms *dt)
{
struct tps65950_softc *sc = tch->cookie;
uint8_t seconds_reg, minutes_reg, hours_reg,
days_reg, months_reg, years_reg, weeks_reg;
int error = 0;
iic_acquire_bus(sc->sc_i2c, 0);
RTC_READ(TPS65950_ID4_REG_SECONDS_REG, seconds_reg);
RTC_READ(TPS65950_ID4_REG_MINUTES_REG, minutes_reg);
RTC_READ(TPS65950_ID4_REG_HOURS_REG, hours_reg);
RTC_READ(TPS65950_ID4_REG_DAYS_REG, days_reg);
RTC_READ(TPS65950_ID4_REG_MONTHS_REG, months_reg);
RTC_READ(TPS65950_ID4_REG_YEARS_REG, years_reg);
RTC_READ(TPS65950_ID4_REG_WEEKS_REG, weeks_reg);
iic_release_bus(sc->sc_i2c, 0);
dt->dt_sec = bcdtobin(seconds_reg);
dt->dt_min = bcdtobin(minutes_reg);
dt->dt_hour = bcdtobin(hours_reg);
dt->dt_day = bcdtobin(days_reg);
dt->dt_mon = bcdtobin(months_reg);
dt->dt_year = bcdtobin(years_reg) + 2000;
dt->dt_wday = bcdtobin(weeks_reg);
return 0;
}
static int
tps65950_rtc_settime(todr_chip_handle_t tch, struct clock_ymdhms *dt)
{
struct tps65950_softc *sc = tch->cookie;
int error = 0;
iic_acquire_bus(sc->sc_i2c, 0);
tps65950_rtc_enable(sc, false);
RTC_WRITE(TPS65950_ID4_REG_SECONDS_REG, bintobcd(dt->dt_sec));
RTC_WRITE(TPS65950_ID4_REG_MINUTES_REG, bintobcd(dt->dt_min));
RTC_WRITE(TPS65950_ID4_REG_HOURS_REG, bintobcd(dt->dt_hour));
RTC_WRITE(TPS65950_ID4_REG_DAYS_REG, bintobcd(dt->dt_day));
RTC_WRITE(TPS65950_ID4_REG_MONTHS_REG, bintobcd(dt->dt_mon));
RTC_WRITE(TPS65950_ID4_REG_YEARS_REG, bintobcd(dt->dt_year % 100));
RTC_WRITE(TPS65950_ID4_REG_WEEKS_REG, bintobcd(dt->dt_wday));
tps65950_rtc_enable(sc, true);
iic_release_bus(sc->sc_i2c, 0);
return error;
}
static void
tps65950_wdog_attach(struct tps65950_softc *sc)
{
sc->sc_smw.smw_name = device_xname(sc->sc_dev);
sc->sc_smw.smw_cookie = sc;
sc->sc_smw.smw_setmode = tps65950_wdog_setmode;
sc->sc_smw.smw_tickle = tps65950_wdog_tickle;
sc->sc_smw.smw_period = TPS65950_WDOG_DEFAULT_PERIOD;
if (sysmon_wdog_register(&sc->sc_smw) != 0)
aprint_error_dev(sc->sc_dev, "couldn't register watchdog\n");
iic_acquire_bus(sc->sc_i2c, 0);
tps65950_write_1(sc, TPS65950_ID4_REG_WATCHDOG_CFG, 0);
iic_release_bus(sc->sc_i2c, 0);
}
static int
tps65950_wdog_setmode(struct sysmon_wdog *smw)
{
struct tps65950_softc *sc = smw->smw_cookie;
int error;
if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
iic_acquire_bus(sc->sc_i2c, 0);
error = tps65950_write_1(sc, TPS65950_ID4_REG_WATCHDOG_CFG, 0);
iic_release_bus(sc->sc_i2c, 0);
} else {
if (smw->smw_period == WDOG_PERIOD_DEFAULT) {
smw->smw_period = TPS65950_WDOG_DEFAULT_PERIOD;
}
if (smw->smw_period > 30) {
error = EINVAL;
} else {
error = tps65950_wdog_tickle(smw);
}
}
return error;
}
static int
tps65950_wdog_tickle(struct sysmon_wdog *smw)
{
struct tps65950_softc *sc = smw->smw_cookie;
int error;
iic_acquire_bus(sc->sc_i2c, 0);
tps65950_write_1(sc, TPS65950_ID4_REG_WATCHDOG_CFG, 0);
error = tps65950_write_1(sc, TPS65950_ID4_REG_WATCHDOG_CFG,
smw->smw_period + 1);
iic_release_bus(sc->sc_i2c, 0);
return error;
}
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