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[src/trunk]: src/sys/dev/i2c yet another temperature sensor / ADC
details: https://anonhg.NetBSD.org/src/rev/7c0f71b6431a
branches: trunk
changeset: 321298:7c0f71b6431a
user: macallan <macallan%NetBSD.org@localhost>
date: Fri Mar 09 20:16:54 2018 +0000
description:
yet another temperature sensor / ADC
this one supports Analog Devices AD7417, found in some G5 macs
depends on OpenFirmware for calibration data
diffstat:
sys/dev/i2c/adadc.c | 240 ++++++++++++++++++++++++++++++++++++++++++++++++++
sys/dev/i2c/files.i2c | 7 +-
2 files changed, 246 insertions(+), 1 deletions(-)
diffs (265 lines):
diff -r d456e5379a13 -r 7c0f71b6431a sys/dev/i2c/adadc.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/i2c/adadc.c Fri Mar 09 20:16:54 2018 +0000
@@ -0,0 +1,240 @@
+/* $NetBSD: adadc.c,v 1.1 2018/03/09 20:16:54 macallan Exp $ */
+
+/*-
+ * Copyright (c) 2018 Michael Lorenz
+ * 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.
+ */
+
+/* a driver for Analog Devices AD7417 temperature sensors / ADCs */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: adadc.c,v 1.1 2018/03/09 20:16:54 macallan Exp $");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/conf.h>
+#include <sys/bus.h>
+
+#include <dev/i2c/i2cvar.h>
+
+#include <dev/sysmon/sysmonvar.h>
+
+#include <dev/ofw/openfirm.h>
+
+/* commands */
+#define ADADC_TEMP 0x00 /* temperature, 16bit */
+#define ADADC_CONFIG 0x01 /* 8bit */
+#define ADADC_THYST 0x02 /* 16bit */
+#define ADADC_TOTI 0x03 /* 16bit, temperature threshold */
+#define ADADC_ADC 0x04 /* 16bit, ADC value */
+#define ADADC_CONFIG2 0x05 /* 8bit */
+
+/*
+ * registers
+ * ADADC_TEMP has signed temperature in C in first byte, left aligned fraction
+ * in 2nd byte.
+ */
+
+#define ADADC_CFG_CHANNEL_0 0x00
+#define ADADC_CFG_CHANNEL_1 0x20
+#define ADADC_CFG_CHANNEL_2 0x40
+#define ADADC_CFG_CHANNEL_3 0x60
+#define ADADC_CFG_CHANNEL_4 0x80
+#define ADADC_CFG_CHANNEL_MASK 0xe0
+#define ADADC_CFG_FAULT_MASK 0x18
+#define ADADC_CFG_OTI_POL 0x04 /* overtemp output polarity */
+#define ADADC_CFG_INTMODE 0x02 /* interrupt mode */
+#define ADADC_CFG_SHUTDOWN 0x01 /* shutdown mode */
+
+
+struct adadc_softc {
+ device_t sc_dev;
+ i2c_tag_t sc_i2c;
+ i2c_addr_t sc_addr;
+
+ struct sysmon_envsys *sc_sme;
+ envsys_data_t sc_sensors[5];
+ int sc_nsensors;
+ int sc_diode_offset, sc_diode_slope;
+};
+
+static int adadc_match(device_t, cfdata_t, void *);
+static void adadc_attach(device_t, device_t, void *);
+
+static void adadc_sensors_refresh(struct sysmon_envsys *, envsys_data_t *);
+
+CFATTACH_DECL_NEW(adadc, sizeof(struct adadc_softc),
+ adadc_match, adadc_attach, NULL, NULL);
+
+static const char * dstemp_compats[] = {
+ "ad7417",
+ NULL
+};
+
+static int slope[5] = {0, 0, 0x0320, 0x00a0, 0x1f40};
+
+static int
+adadc_match(device_t parent, cfdata_t match, void *aux)
+{
+ struct i2c_attach_args *ia = aux;
+
+ if (ia->ia_name == NULL) {
+ /* no ID registers on this chip */
+ if ((ia->ia_addr & 0x2b) == 0x2b)
+ return 1;
+ return 0;
+ } else {
+ return iic_compat_match(ia, dstemp_compats);
+ }
+}
+
+static void
+adadc_attach(device_t parent, device_t self, void *aux)
+{
+ struct adadc_softc *sc = device_private(self);
+ struct i2c_attach_args *ia = aux;
+ envsys_data_t *s;
+ int error, ch, cpuid;
+ uint32_t eeprom[40];
+ uint8_t cmd, data;
+ char loc[256];
+ int which_cpu;
+
+ sc->sc_dev = self;
+ sc->sc_i2c = ia->ia_tag;
+ sc->sc_addr = ia->ia_addr;
+
+ aprint_naive("\n");
+ aprint_normal(": AD7417\n");
+
+ cmd = ADADC_CONFIG;
+ error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
+ sc->sc_addr, &cmd, 1, &data, 1, 0);
+
+ sc->sc_sme = sysmon_envsys_create();
+ sc->sc_sme->sme_name = device_xname(self);
+ sc->sc_sme->sme_cookie = sc;
+ sc->sc_sme->sme_refresh = adadc_sensors_refresh;
+ sc->sc_nsensors = 0;
+
+ which_cpu = 0;
+ ch = OF_child(ia->ia_cookie);
+ while (ch != 0) {
+ if (OF_getprop(ch, "location", loc, 32) > 0) {
+ int reg = 0;
+ OF_getprop(ch, "reg", ®, sizeof(reg));
+ s = &sc->sc_sensors[sc->sc_nsensors];
+ switch (reg) {
+ case 0:
+ if (strstr(loc, "CPU B") != NULL)
+ which_cpu = 1;
+ /* FALLTHROUGH */
+ case 1:
+ s->units = ENVSYS_STEMP;
+ break;
+ case 2:
+ case 4:
+ s->units = ENVSYS_SAMPS;
+ break;
+ case 3:
+ s->units = ENVSYS_SVOLTS_DC;
+ break;
+ default:
+ s->units = ENVSYS_INTEGER;
+ }
+ strncpy(s->desc, loc, sizeof(s->desc));
+ s->private = reg;
+ sysmon_envsys_sensor_attach(sc->sc_sme, s);
+ sc->sc_nsensors++;
+ }
+ ch = OF_peer(ch);
+ }
+ aprint_debug_dev(self, "monitoring CPU %d\n", which_cpu);
+ if (which_cpu == 0) {
+ cpuid = OF_finddevice("/u3/i2c/cpuid@a0");
+ } else
+ cpuid = OF_finddevice("/u3/i2c/cpuid@a2");
+ error = OF_getprop(cpuid, "cpuid", eeprom, sizeof(eeprom));
+ if (error >= 0) {
+ sc->sc_diode_slope = eeprom[0x11] >> 16;
+ sc->sc_diode_offset = (int16_t)(eeprom[0x11] & 0xffff) << 12;
+ }
+ sysmon_envsys_register(sc->sc_sme);
+}
+
+static void
+adadc_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
+{
+ struct adadc_softc *sc = sme->sme_cookie;
+ uint8_t cmd = ADADC_CONFIG;
+ int16_t data = 0;
+ uint16_t rdata;
+ uint8_t cfg;
+ int error, ch;
+
+
+ iic_acquire_bus(sc->sc_i2c, 0);
+ if (edata->private > 0) {
+ error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
+ sc->sc_addr, &cmd, 1, &cfg, 1, 0);
+ ch = cfg >> 5;
+ /* are we on the right channel already? */
+ if (ch != edata->private) {
+ /* nope */
+ cfg &= 0x1f;
+ cfg |= (edata->private & 7) << 5;
+ iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP,
+ sc->sc_addr, &cmd, 1, &cfg, 1, 0);
+ }
+ cmd = ADADC_ADC;
+ /* now read the ADC register */
+ error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
+ sc->sc_addr, &cmd, 1, &rdata, 2, 0);
+ rdata = be16toh(rdata) >> 6;
+ if (edata->private == 1) {
+ int temp;
+ temp = (rdata * sc->sc_diode_slope +
+ sc->sc_diode_offset) >> 2;
+ /* 16.16 fixed point */
+ edata->value_cur = (temp >> 12) * 62500 + 273150000;
+ } else {
+ int temp = rdata * slope[edata->private];
+ edata->value_cur = (temp >> 12) * 62500;
+ }
+ } else {
+ cmd = ADADC_TEMP;
+ /* just read the temperature register */
+ error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
+ sc->sc_addr, &cmd, 1, &data, 2, 0);
+ edata->value_cur = ((data >> 6) * 250000) + 273150000;
+ }
+ iic_release_bus(sc->sc_i2c, 0);
+
+ if (error) {
+ edata->state = ENVSYS_SINVALID;
+ } else {
+ edata->state = ENVSYS_SVALID;
+ }
+}
diff -r d456e5379a13 -r 7c0f71b6431a sys/dev/i2c/files.i2c
--- a/sys/dev/i2c/files.i2c Fri Mar 09 20:15:03 2018 +0000
+++ b/sys/dev/i2c/files.i2c Fri Mar 09 20:16:54 2018 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.i2c,v 1.85 2018/03/08 23:25:56 macallan Exp $
+# $NetBSD: files.i2c,v 1.86 2018/03/09 20:16:54 macallan Exp $
obsolete defflag opt_i2cbus.h I2C_SCAN
define i2cbus { }
@@ -309,6 +309,11 @@
attach fcu at iic
file dev/i2c/fcu.c fcu
+# Analog Devices AD7417 thermometer and ADC
+device adadc: sysmon_envsys
+attach adadc at iic
+file dev/i2c/adadc.c adadc
+
# HID over i2c
# HID "bus"
define ihidbus {[ reportid = -1 ]}
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