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authorAlexander Yurchenko <grange@cvs.openbsd.org>2004-05-23 18:12:38 +0000
committerAlexander Yurchenko <grange@cvs.openbsd.org>2004-05-23 18:12:38 +0000
commit1a8a89c9ec33fced6963b83f13e56e93d7b0a550 (patch)
tree1554a26cd054f577856a70abb18b1609815be3b1 /sys
parentc3af576a7b133b4c2046eef9ddf14925c38ba25c (diff)
lmtemp(4) -- National Semiconductor LM75/LM77 temperature sensor driver.
Based on the driver from NetBSD (r) written by Jason R. Thorpe, adapted for our sensors infrastructure and with LM77 support. ok deraadt@
Diffstat (limited to 'sys')
-rw-r--r--sys/dev/i2c/files.i2c7
-rw-r--r--sys/dev/i2c/lm75.c220
-rw-r--r--sys/dev/i2c/lm75reg.h180
3 files changed, 406 insertions, 1 deletions
diff --git a/sys/dev/i2c/files.i2c b/sys/dev/i2c/files.i2c
index c53863d6ec2..48d81a83e8e 100644
--- a/sys/dev/i2c/files.i2c
+++ b/sys/dev/i2c/files.i2c
@@ -1,4 +1,4 @@
-# $OpenBSD: files.i2c,v 1.1 2004/05/23 17:33:43 grange Exp $
+# $OpenBSD: files.i2c,v 1.2 2004/05/23 18:12:37 grange Exp $
# $NetBSD: files.i2c,v 1.3 2003/10/20 16:24:10 briggs Exp $
device iic { addr, [size = -1] }
@@ -8,3 +8,8 @@ file dev/i2c/i2c_exec.c iic | i2cbus | i2cexec
# Common module for bit-bang'ing an I2C bus
file dev/i2c/i2c_bitbang.c i2c_bitbang
+
+# National Semiconductor LM75/LM77 temperature sensor
+device lmtemp
+attach lmtemp at iic
+file dev/i2c/lm75.c lmtemp
diff --git a/sys/dev/i2c/lm75.c b/sys/dev/i2c/lm75.c
new file mode 100644
index 00000000000..162247bdc60
--- /dev/null
+++ b/sys/dev/i2c/lm75.c
@@ -0,0 +1,220 @@
+/* $OpenBSD: lm75.c,v 1.1 2004/05/23 18:12:37 grange Exp $ */
+/* $NetBSD: lm75.c,v 1.1 2003/09/30 00:35:31 thorpej Exp $ */
+/*
+ * Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * Copyright (c) 2003 Wasabi Systems, Inc.
+ * All rights reserved.
+ *
+ * Written by Jason R. Thorpe for Wasabi Systems, Inc.
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed for the NetBSD Project by
+ * Wasabi Systems, Inc.
+ * 4. The name of Wasabi Systems, Inc. may not be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
+ * 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.
+ */
+
+/*
+ * National Semiconductor LM75/LM77 temperature sensor.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/kernel.h>
+#include <sys/sensors.h>
+#include <sys/timeout.h>
+
+#include <dev/i2c/i2cvar.h>
+#include <dev/i2c/lm75reg.h>
+
+struct lmtemp_softc {
+ struct device sc_dev;
+ i2c_tag_t sc_tag;
+ int sc_address;
+ int sc_model;
+
+ struct sensor sc_sensor;
+ struct timeout sc_timeout;
+};
+
+int lmtemp_match(struct device *, void *, void *);
+void lmtemp_attach(struct device *, struct device *, void *);
+
+struct cfattach lmtemp_ca = {
+ sizeof(struct lmtemp_softc),
+ lmtemp_match,
+ lmtemp_attach
+};
+
+struct cfdriver lmtemp_cd = {
+ NULL, "lmtemp", DV_DULL
+};
+
+int lmtemp_config_write(struct lmtemp_softc *, uint8_t);
+int lmtemp_temp_read(struct lmtemp_softc *, uint8_t, int *);
+void lmtemp_refresh_sensor_data(void *);
+
+int
+lmtemp_match(struct device *parent, void *match, void *aux)
+{
+ struct i2c_attach_args *ia = aux;
+
+ /* XXX: we allow wider mask for LM77 */
+ if ((ia->ia_addr & LM75_ADDRMASK) == LM75_ADDR)
+ return (1);
+
+ return (0);
+}
+
+void
+lmtemp_attach(struct device *parent, struct device *self, void *aux)
+{
+ struct lmtemp_softc *sc = (struct lmtemp_softc *)self;
+ struct i2c_attach_args *ia = aux;
+ u_int8_t ptr[1], reg[LM75_TEMP_LEN];
+
+ sc->sc_tag = ia->ia_tag;
+ sc->sc_address = ia->ia_addr;
+
+ /* Try to detect LM77 by poking Thigh register */
+ ptr[0] = LM77_REG_THIGH;
+ iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
+ if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
+ sc->sc_address, ptr, 1, reg, LM75_TEMP_LEN, 0) == 0) {
+ /* Power up default is 64 degC */
+ if (lm77_wordtotemp((reg[0] << 8) | reg[1]) == 64 * 2) {
+ sc->sc_model = LM_MODEL_LM77;
+ printf(": LM77\n");
+ }
+ } else {
+ sc->sc_model = LM_MODEL_LM75;
+ printf(": LM75\n");
+ }
+ iic_release_bus(sc->sc_tag, I2C_F_POLL);
+
+ /* Set the configuration to defaults */
+ iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
+ if (lmtemp_config_write(sc, 0) != 0) {
+ printf("%s: unable to write config register\n",
+ sc->sc_dev.dv_xname);
+ iic_release_bus(sc->sc_tag, I2C_F_POLL);
+ return;
+ }
+ iic_release_bus(sc->sc_tag, I2C_F_POLL);
+
+ /* Initialize sensor data */
+ strlcpy(sc->sc_sensor.device, sc->sc_dev.dv_xname,
+ sizeof(sc->sc_sensor.device));
+ sc->sc_sensor.type = SENSOR_TEMP;
+ strlcpy(sc->sc_sensor.desc, "TEMP", sizeof(sc->sc_sensor.desc));
+
+ /* Hook into the hw.sensors sysctl */
+ SENSOR_ADD(&sc->sc_sensor);
+
+ /* Set poll timer */
+ timeout_set(&sc->sc_timeout, lmtemp_refresh_sensor_data, sc);
+ timeout_add(&sc->sc_timeout, LM_POLLTIME);
+}
+
+int
+lmtemp_config_write(struct lmtemp_softc *sc, uint8_t val)
+{
+ uint8_t cmdbuf[2];
+
+ cmdbuf[0] = LM75_REG_CONFIG;
+ cmdbuf[1] = val;
+
+ return (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
+ sc->sc_address, cmdbuf, 1, &cmdbuf[1], 1, I2C_F_POLL));
+}
+
+int
+lmtemp_temp_read(struct lmtemp_softc *sc, uint8_t which, int *valp)
+{
+ u_int8_t cmdbuf[1];
+ u_int8_t buf[LM75_TEMP_LEN];
+ int error;
+
+ cmdbuf[0] = which;
+
+ error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
+ sc->sc_address, cmdbuf, 1, buf, LM75_TEMP_LEN, 0);
+ if (error)
+ return (error);
+
+ switch (sc->sc_model) {
+ case LM_MODEL_LM75:
+ *valp = lm75_wordtotemp((buf[0] << 8) | buf[1]);
+ break;
+ case LM_MODEL_LM77:
+ *valp = lm77_wordtotemp((buf[0] << 8) | buf[1]);
+ break;
+ default:
+ printf("%s: unknown model (%d)\n",
+ sc->sc_dev.dv_xname, sc->sc_model);
+ return (1);
+ }
+
+ return (0);
+}
+
+void
+lmtemp_refresh_sensor_data(void *aux)
+{
+ struct lmtemp_softc *sc = aux;
+ int val;
+ int error;
+
+ error = lmtemp_temp_read(sc, LM75_REG_TEMP, &val);
+ if (error) {
+#if 0
+ printf("%s: unable to read temperature, error = %d\n",
+ sc->sc_dev.dv_xname, error);
+#endif
+ sc->sc_sensor.flags |= SENSOR_FINVALID;
+ return;
+ }
+
+ sc->sc_sensor.value = val * 500000 + 273150000;
+ sc->sc_sensor.flags &= ~SENSOR_FINVALID;
+
+ timeout_add(&sc->sc_timeout, LM_POLLTIME);
+}
diff --git a/sys/dev/i2c/lm75reg.h b/sys/dev/i2c/lm75reg.h
new file mode 100644
index 00000000000..892b8b56791
--- /dev/null
+++ b/sys/dev/i2c/lm75reg.h
@@ -0,0 +1,180 @@
+/* $OpenBSD: lm75reg.h,v 1.1 2004/05/23 18:12:37 grange Exp $ */
+/* $NetBSD: lm75reg.h,v 1.1 2003/09/30 00:35:31 thorpej Exp $ */
+/*
+ * Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * Copyright (c) 2003 Wasabi Systems, Inc.
+ * All rights reserved.
+ *
+ * Written by Jason R. Thorpe for Wasabi Systems, Inc.
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed for the NetBSD Project by
+ * Wasabi Systems, Inc.
+ * 4. The name of Wasabi Systems, Inc. may not be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
+ * 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.
+ */
+
+#ifndef _DEV_I2C_LM75REG_H_
+#define _DEV_I2C_LM75REG_H_
+
+#define LM_MODEL_LM75 1
+#define LM_MODEL_LM77 2
+
+#define LM_POLLTIME (hz * 2) /* 2s */
+
+/*
+ * LM75 temperature sensor I2C address:
+ *
+ * 100 1xxx
+ */
+#define LM75_ADDRMASK 0x78
+#define LM75_ADDR 0x48
+
+/*
+ * LM77 temperature sensor I2C address:
+ *
+ * 100 10xx
+ */
+#define LM77_ADDRMASK 0x7c
+#define LM77_ADDR 0x48
+
+/*
+ * Temperature on the LM75 is represented by a 9-bit two's complement
+ * integer in steps of 0.5C. The following examples are taken from
+ * the LM75 data sheet:
+ *
+ * +125C 0 1111 1010 0x0fa
+ * +25C 0 0011 0010 0x032
+ * +0.5C 0 0000 0001 0x001
+ * 0C 0 0000 0000 0x000
+ * -0.5C 1 1111 1111 0x1ff
+ * -25C 1 1100 1110 0x1ce
+ * -55C 1 1001 0010 0x192
+ *
+ * Temperature on the LM77 is represented by a 10-bit two's complement
+ * integer in steps of 0.5C:
+ *
+ * +130C 01 0000 0100 0x104
+ * +125C 00 1111 1010 0x0fa
+ * +25C 00 0011 0010 0x032
+ * +0.5C 00 0000 0001 0x001
+ * 0C 00 0000 0000 0x000
+ * -0.5C 11 1111 1111 0x3ff
+ * -25C 11 1100 1110 0x3ce
+ * -55C 11 1001 0010 0x392
+ */
+
+#define LM75_REG_TEMP 0x00
+#define LM75_REG_CONFIG 0x01
+#define LM75_REG_THYST_SET_POINT 0x02
+#define LM75_REG_TOS_SET_POINT 0x03
+
+#define LM77_REG_TLOW 0x04
+#define LM77_REG_THIGH 0x05
+
+#define LM77_TEMP_ST_LOW 0x01
+#define LM77_TEMP_ST_HIGH 0x02
+#define LM77_TEMP_ST_CRIT 0x04
+
+#define LM75_TEMP_LEN 2 /* 2 data bytes */
+
+#define LM75_CONFIG_SHUTDOWN 0x01
+#define LM75_CONFIG_CMPINT 0x02
+#define LM75_CONFIG_OSPOLARITY 0x04
+#define LM75_CONFIG_FAULT_QUEUE_1 (0 << 3)
+#define LM75_CONFIG_FAULT_QUEUE_2 (1 << 3)
+#define LM75_CONFIG_FAULT_QUEUE_4 (2 << 3)
+#define LM75_CONFIG_FAULT_QUEUE_6 (3 << 3)
+
+#define LM77_CONFIG_INTPOLARITY 0x08
+#define LM77_CONFIG_FAULT_QUEUE_4 0x10
+
+/*
+ * LM75 temperature word:
+ *
+ * MSB Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 X X X X X X X
+ * 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
+ *
+ *
+ * LM77 temperature word:
+ *
+ * Sign Sign Sign Sign MSB Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 Status bits
+ * 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
+ */
+
+static __inline int
+lm75_wordtotemp(u_int16_t word)
+{
+ return ((int16_t)word / 128);
+}
+
+static __inline u_int16_t
+lm75_temptoword(int temp)
+{
+ int sign = 0;
+
+ if (temp < 0) {
+ sign = 1;
+ temp = -temp;
+ };
+
+ return ((sign << 15 ) | ((temp & 0xff) << 7));
+}
+
+static __inline int
+lm77_wordtotemp(u_int16_t word)
+{
+ return ((int16_t)word / 8);
+}
+
+static __inline u_int16_t
+lm77_temptoword(int temp)
+{
+ int sign = 0;
+
+ if (temp < 0) {
+ sign = 0xf;
+ temp = -temp;
+ };
+
+ return ((sign << 12 ) | ((temp & 0x1ff) << 3));
+}
+
+#endif /* _DEV_I2C_LM75REG_H_ */