diff options
Diffstat (limited to 'sys/dev/iicbus/ds1307.c')
| -rw-r--r-- | sys/dev/iicbus/ds1307.c | 215 |
1 files changed, 103 insertions, 112 deletions
diff --git a/sys/dev/iicbus/ds1307.c b/sys/dev/iicbus/ds1307.c index 987db0d..83edbe5 100644 --- a/sys/dev/iicbus/ds1307.c +++ b/sys/dev/iicbus/ds1307.c @@ -56,43 +56,36 @@ __FBSDID("$FreeBSD$"); struct ds1307_softc { device_t sc_dev; - int sc_year0; - struct intr_config_hook enum_hook; - uint16_t sc_addr; /* DS1307 slave address. */ + struct intr_config_hook + enum_hook; uint8_t sc_ctrl; - int sc_mcp7941x; + bool sc_mcp7941x; + bool sc_use_ampm; }; static void ds1307_start(void *); #ifdef FDT static const struct ofw_compat_data ds1307_compat_data[] = { - {"dallas,ds1307", (uintptr_t)"Maxim DS1307 RTC"}, - {"maxim,ds1307", (uintptr_t)"Maxim DS1307 RTC"}, - {"microchip,mcp7941x", (uintptr_t)"Microchip MCP7941x RTC"}, + {"dallas,ds1307", (uintptr_t)"Dallas DS1307 RTC"}, + {"maxim,ds1307", (uintptr_t)"Maxim DS1307 RTC"}, + {"microchip,mcp7941x", (uintptr_t)"Microchip MCP7941x RTC"}, { NULL, 0 } }; #endif static int -ds1307_read(device_t dev, uint16_t addr, uint8_t reg, uint8_t *data, size_t len) +ds1307_read1(device_t dev, uint8_t reg, uint8_t *data) { - struct iic_msg msg[2] = { - { addr, IIC_M_WR | IIC_M_NOSTOP, 1, ® }, - { addr, IIC_M_RD, len, data }, - }; - return (iicbus_transfer(dev, msg, nitems(msg))); + return (iicdev_readfrom(dev, reg, data, 1, IIC_INTRWAIT)); } static int -ds1307_write(device_t dev, uint16_t addr, uint8_t *data, size_t len) +ds1307_write1(device_t dev, uint8_t reg, uint8_t data) { - struct iic_msg msg[1] = { - { addr, IIC_M_WR, len, data }, - }; - return (iicbus_transfer(dev, msg, nitems(msg))); + return (iicdev_writeto(dev, reg, &data, 1, IIC_INTRWAIT)); } static int @@ -101,8 +94,7 @@ ds1307_ctrl_read(struct ds1307_softc *sc) int error; sc->sc_ctrl = 0; - error = ds1307_read(sc->sc_dev, sc->sc_addr, DS1307_CONTROL, - &sc->sc_ctrl, sizeof(sc->sc_ctrl)); + error = ds1307_read1(sc->sc_dev, DS1307_CONTROL, &sc->sc_ctrl); if (error) { device_printf(sc->sc_dev, "cannot read from RTC.\n"); return (error); @@ -115,59 +107,10 @@ static int ds1307_ctrl_write(struct ds1307_softc *sc) { int error; - uint8_t data[2]; + uint8_t ctrl; - data[0] = DS1307_CONTROL; - data[1] = sc->sc_ctrl & DS1307_CTRL_MASK; - error = ds1307_write(sc->sc_dev, sc->sc_addr, data, sizeof(data)); - if (error != 0) - device_printf(sc->sc_dev, "cannot write to RTC.\n"); - - return (error); -} - -static int -ds1307_osc_enable(struct ds1307_softc *sc) -{ - int error; - uint8_t data[2], secs; - - secs = 0; - error = ds1307_read(sc->sc_dev, sc->sc_addr, DS1307_SECS, - &secs, sizeof(secs)); - if (error) { - device_printf(sc->sc_dev, "cannot read from RTC.\n"); - return (error); - } - /* Check if the oscillator is disabled. */ - if ((secs & DS1307_SECS_CH) == 0) - return (0); - device_printf(sc->sc_dev, "clock was halted, check the battery.\n"); - data[0] = DS1307_SECS; - data[1] = secs & DS1307_SECS_MASK; - error = ds1307_write(sc->sc_dev, sc->sc_addr, data, sizeof(data)); - if (error != 0) - device_printf(sc->sc_dev, "cannot write to RTC.\n"); - - return (error); -} - -static int -ds1307_set_24hrs_mode(struct ds1307_softc *sc) -{ - int error; - uint8_t data[2], hour; - - hour = 0; - error = ds1307_read(sc->sc_dev, sc->sc_addr, DS1307_HOUR, - &hour, sizeof(hour)); - if (error) { - device_printf(sc->sc_dev, "cannot read from RTC.\n"); - return (error); - } - data[0] = DS1307_HOUR; - data[1] = hour & DS1307_HOUR_MASK; - error = ds1307_write(sc->sc_dev, sc->sc_addr, data, sizeof(data)); + ctrl = sc->sc_ctrl & DS1307_CTRL_MASK; + error = ds1307_write1(sc->sc_dev, DS1307_CONTROL, ctrl); if (error != 0) device_printf(sc->sc_dev, "cannot write to RTC.\n"); @@ -283,7 +226,7 @@ ds1307_probe(device_t dev) #else device_set_desc(dev, "Maxim DS1307 RTC"); - return (BUS_PROBE_DEFAULT); + return (BUS_PROBE_NOWILDCARD); #endif } @@ -294,13 +237,13 @@ ds1307_attach(device_t dev) sc = device_get_softc(dev); sc->sc_dev = dev; - sc->sc_addr = iicbus_get_addr(dev); - sc->sc_year0 = 1900; sc->enum_hook.ich_func = ds1307_start; sc->enum_hook.ich_arg = dev; +#ifdef FDT if (ofw_bus_is_compatible(dev, "microchip,mcp7941x")) sc->sc_mcp7941x = 1; +#endif /* * We have to wait until interrupts are enabled. Usually I2C read @@ -312,6 +255,14 @@ ds1307_attach(device_t dev) return (0); } +static int +ds1307_detach(device_t dev) +{ + + clock_unregister(dev); + return (0); +} + static void ds1307_start(void *xdev) { @@ -320,6 +271,7 @@ ds1307_start(void *xdev) struct sysctl_ctx_list *ctx; struct sysctl_oid *tree_node; struct sysctl_oid_list *tree; + uint8_t secs; dev = (device_t)xdev; sc = device_get_softc(dev); @@ -328,12 +280,16 @@ ds1307_start(void *xdev) tree = SYSCTL_CHILDREN(tree_node); config_intrhook_disestablish(&sc->enum_hook); - /* Set the 24 hours mode. */ - if (ds1307_set_24hrs_mode(sc) != 0) - return; - /* Enable the oscillator if halted. */ - if (ds1307_osc_enable(sc) != 0) + + /* Check if the oscillator is disabled. */ + if (ds1307_read1(sc->sc_dev, DS1307_SECS, &secs) != 0) { + device_printf(sc->sc_dev, "cannot read from RTC.\n"); return; + } + if ((secs & DS1307_SECS_CH) != 0) { + device_printf(sc->sc_dev, + "WARNING: RTC clock stopped, check the battery.\n"); + } /* Configuration parameters. */ SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "sqwe", @@ -347,8 +303,13 @@ ds1307_start(void *xdev) CTLFLAG_RW | CTLTYPE_UINT | CTLFLAG_MPSAFE, sc, 0, ds1307_sqw_out_sysctl, "IU", "DS1307 square-wave output state"); - /* 1 second resolution. */ - clock_register(dev, 1000000); + /* + * Register as a clock with 1 second resolution. Schedule the + * clock_settime() method to be called just after top-of-second; + * resetting the time resets top-of-second in the hardware. + */ + clock_register_flags(dev, 1000000, CLOCKF_SETTIME_NO_ADJ); + clock_schedule(dev, 1); } static int @@ -357,27 +318,41 @@ ds1307_gettime(device_t dev, struct timespec *ts) int error; struct clocktime ct; struct ds1307_softc *sc; - uint8_t data[7]; + uint8_t data[7], hourmask; sc = device_get_softc(dev); - memset(data, 0, sizeof(data)); - error = ds1307_read(sc->sc_dev, sc->sc_addr, DS1307_SECS, - data, sizeof(data)); + error = iicdev_readfrom(sc->sc_dev, DS1307_SECS, data, sizeof(data), + IIC_INTRWAIT); if (error != 0) { device_printf(dev, "cannot read from RTC.\n"); return (error); } + + /* If the clock halted, we don't have good data. */ + if (data[DS1307_SECS] & DS1307_SECS_CH) + return (EINVAL); + + /* If chip is in AM/PM mode remember that. */ + if (data[DS1307_HOUR] & DS1307_HOUR_USE_AMPM) { + sc->sc_use_ampm = true; + hourmask = DS1307_HOUR_MASK_12HR; + } else + hourmask = DS1307_HOUR_MASK_24HR; + ct.nsec = 0; - ct.sec = FROMBCD(data[DS1307_SECS] & DS1307_SECS_MASK); - ct.min = FROMBCD(data[DS1307_MINS] & DS1307_MINS_MASK); - ct.hour = FROMBCD(data[DS1307_HOUR] & DS1307_HOUR_MASK); - ct.day = FROMBCD(data[DS1307_DATE] & DS1307_DATE_MASK); - ct.dow = data[DS1307_WEEKDAY] & DS1307_WEEKDAY_MASK; - ct.mon = FROMBCD(data[DS1307_MONTH] & DS1307_MONTH_MASK); - ct.year = FROMBCD(data[DS1307_YEAR] & DS1307_YEAR_MASK); - ct.year += sc->sc_year0; - if (ct.year < POSIX_BASE_YEAR) - ct.year += 100; /* assume [1970, 2069] */ + ct.sec = FROMBCD(data[DS1307_SECS] & DS1307_SECS_MASK); + ct.min = FROMBCD(data[DS1307_MINS] & DS1307_MINS_MASK); + ct.hour = FROMBCD(data[DS1307_HOUR] & hourmask); + ct.day = FROMBCD(data[DS1307_DATE] & DS1307_DATE_MASK); + ct.mon = FROMBCD(data[DS1307_MONTH] & DS1307_MONTH_MASK); + ct.year = FROMBCD(data[DS1307_YEAR] & DS1307_YEAR_MASK); + + if (sc->sc_use_ampm) { + if (ct.hour == 12) + ct.hour = 0; + if (data[DS1307_HOUR] & DS1307_HOUR_IS_PM) + ct.hour += 12; + } return (clock_ct_to_ts(&ct, ts)); } @@ -385,28 +360,43 @@ ds1307_gettime(device_t dev, struct timespec *ts) static int ds1307_settime(device_t dev, struct timespec *ts) { - int error; struct clocktime ct; struct ds1307_softc *sc; - uint8_t data[8]; + int error; + uint8_t data[7]; + uint8_t pmflags; sc = device_get_softc(dev); - /* Accuracy is only one second. */ - if (ts->tv_nsec >= 500000000) - ts->tv_sec++; - ts->tv_nsec = 0; + + /* + * We request a timespec with no resolution-adjustment. That also + * disables utc adjustment, so apply that ourselves. + */ + ts->tv_sec -= utc_offset(); clock_ts_to_ct(ts, &ct); - memset(data, 0, sizeof(data)); - data[0] = DS1307_SECS; - data[DS1307_SECS + 1] = TOBCD(ct.sec); - data[DS1307_MINS + 1] = TOBCD(ct.min); - data[DS1307_HOUR + 1] = TOBCD(ct.hour); - data[DS1307_DATE + 1] = TOBCD(ct.day); - data[DS1307_WEEKDAY + 1] = ct.dow; - data[DS1307_MONTH + 1] = TOBCD(ct.mon); - data[DS1307_YEAR + 1] = TOBCD(ct.year % 100); + + /* If the chip is in AM/PM mode, adjust hour and set flags as needed. */ + if (sc->sc_use_ampm) { + pmflags = DS1307_HOUR_USE_AMPM; + if (ct.hour >= 12) { + ct.hour -= 12; + pmflags |= DS1307_HOUR_IS_PM; + } + if (ct.hour == 0) + ct.hour = 12; + } else + pmflags = 0; + + data[DS1307_SECS] = TOBCD(ct.sec); + data[DS1307_MINS] = TOBCD(ct.min); + data[DS1307_HOUR] = TOBCD(ct.hour) | pmflags; + data[DS1307_DATE] = TOBCD(ct.day); + data[DS1307_WEEKDAY] = ct.dow; + data[DS1307_MONTH] = TOBCD(ct.mon); + data[DS1307_YEAR] = TOBCD(ct.year % 100); /* Write the time back to RTC. */ - error = ds1307_write(dev, sc->sc_addr, data, sizeof(data)); + error = iicdev_writeto(sc->sc_dev, DS1307_SECS, data, sizeof(data), + IIC_INTRWAIT); if (error != 0) device_printf(dev, "cannot write to RTC.\n"); @@ -416,6 +406,7 @@ ds1307_settime(device_t dev, struct timespec *ts) static device_method_t ds1307_methods[] = { DEVMETHOD(device_probe, ds1307_probe), DEVMETHOD(device_attach, ds1307_attach), + DEVMETHOD(device_detach, ds1307_detach), DEVMETHOD(clock_gettime, ds1307_gettime), DEVMETHOD(clock_settime, ds1307_settime), |
