diff options
Diffstat (limited to 'sys/dev')
| -rw-r--r-- | sys/dev/i2c/ds1631.c | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/sys/dev/i2c/ds1631.c b/sys/dev/i2c/ds1631.c index 703e063a8c7..13bcc30d9e8 100644 --- a/sys/dev/i2c/ds1631.c +++ b/sys/dev/i2c/ds1631.c @@ -1,4 +1,4 @@ -/* $OpenBSD: ds1631.c,v 1.3 2006/01/13 00:13:01 deraadt Exp $ */ +/* $OpenBSD: ds1631.c,v 1.4 2006/01/13 21:41:40 deraadt Exp $ */ /* * Copyright (c) 2005 Theo de Raadt @@ -24,7 +24,12 @@ #include <dev/i2c/i2cvar.h> /* Maxim ds 1631 registers */ +#define DS1631_START 0x51 +#define DS1624_START 0xee #define DS1631_TEMP 0xaa +#define DS1631_CONTROL 0xac +#define DS1631_CONTROL_DONE 0x80 +#define DS1631_CONTROL_1SHOT 0x01 /* Sensors */ #define MAXDS_TEMP 0 @@ -67,11 +72,45 @@ maxds_attach(struct device *parent, struct device *self, void *aux) { struct maxds_softc *sc = (struct maxds_softc *)self; struct i2c_attach_args *ia = aux; + u_int8_t cmd, data; int i; + printf(": %s", ia->ia_name); + sc->sc_tag = ia->ia_tag; sc->sc_addr = ia->ia_addr; + iic_acquire_bus(sc->sc_tag, 0); + + cmd = DS1631_CONTROL; + if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, + sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0) == 0) { + if (data & DS1631_CONTROL_1SHOT) { + /* + * 1-Shot mode would require us to write every refresh + * which is stupid. Put us into continuous mode. + */ + data &= ~DS1631_CONTROL_1SHOT; + + (void) iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, + sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0); + //delay(10 * 1000); + printf(", continuous"); + goto dostart; + } + if (data & DS1631_CONTROL_DONE) { +dostart: + cmd = DS1631_START; + if (strcmp(ia->ia_name, "ds1624") == 0) + cmd = DS1624_START; + (void) iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, + sc->sc_addr, &cmd, sizeof cmd, NULL, 0, 0); + printf(", starting"); + } + } + + iic_release_bus(sc->sc_tag, 0); + /* Initialize sensor data. */ for (i = 0; i < MAXDS_NUM_SENSORS; i++) strlcpy(sc->sc_sensor[i].device, sc->sc_dev.dv_xname, @@ -104,7 +143,7 @@ maxds_refresh(void *arg) if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0) == 0) sc->sc_sensor[MAXDS_TEMP].value = 273150000 + - 1000000 * data[1] + 1000000 * data[0] / 256; + ((int)((u_int16_t)data[0] << 8 | data[1])) / 8 * 31250; iic_release_bus(sc->sc_tag, 0); } |