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[src/trunk]: src/sys/dev/i2c preliminary driver for the fan control unit foun...



details:   https://anonhg.NetBSD.org/src/rev/46ca0b74d5c9
branches:  trunk
changeset: 321278:46ca0b74d5c9
user:      macallan <macallan%NetBSD.org@localhost>
date:      Thu Mar 08 23:25:56 2018 +0000

description:
preliminary driver for the fan control unit found in some G5

diffstat:

 sys/dev/i2c/fcu.c     |  200 ++++++++++++++++++++++++++++++++++++++++++++++++++
 sys/dev/i2c/files.i2c |    7 +-
 2 files changed, 206 insertions(+), 1 deletions(-)

diffs (225 lines):

diff -r 658293c0a643 -r 46ca0b74d5c9 sys/dev/i2c/fcu.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/i2c/fcu.c Thu Mar 08 23:25:56 2018 +0000
@@ -0,0 +1,200 @@
+/* $NetBSD: fcu.c,v 1.1 2018/03/08 23:25:56 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.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: fcu.c,v 1.1 2018/03/08 23:25:56 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>
+
+/* FCU registers, from OpenBSD's fcu.c */
+#define FCU_FAN_FAIL   0x0b            /* fans states in bits 0<1-6>7 */
+#define FCU_FAN_ACTIVE 0x0d
+#define FCU_FANREAD(x) 0x11 + (x)*2
+#define FCU_FANSET(x)  0x10 + (x)*2
+#define FCU_PWM_FAIL   0x2b
+#define FCU_PWM_ACTIVE 0x2d
+#define FCU_PWMREAD(x) 0x30 + (x)*2
+
+struct fcu_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[32];
+       int             sc_nsensors;
+};
+
+static int     fcu_match(device_t, cfdata_t, void *);
+static void    fcu_attach(device_t, device_t, void *);
+
+static void    fcu_sensors_refresh(struct sysmon_envsys *, envsys_data_t *);
+
+CFATTACH_DECL_NEW(fcu, sizeof(struct fcu_softc),
+    fcu_match, fcu_attach, NULL, NULL);
+
+static const char * fcu_compats[] = {
+       "fcu",
+       NULL
+};
+
+static int
+fcu_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 == 0x2f)
+                       return 1;
+               return 0;
+       } else {
+               return iic_compat_match(ia, fcu_compats);
+       }
+}
+
+static void
+fcu_attach(device_t parent, device_t self, void *aux)
+{
+       struct fcu_softc *sc = device_private(self);
+       struct i2c_attach_args *ia = aux;
+
+       sc->sc_dev = self;
+       sc->sc_i2c = ia->ia_tag;
+       sc->sc_addr = ia->ia_addr;
+
+       aprint_naive("\n");
+       aprint_normal(": Fan Control Unit\n");
+
+       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 = fcu_sensors_refresh;
+
+       sc->sc_sensors[0].units = ENVSYS_SFANRPM;
+       sc->sc_sensors[1].state = ENVSYS_SINVALID;
+
+       /* round up sensors */
+       int ch;
+
+       sc->sc_nsensors = 0;
+       ch = OF_child(ia->ia_cookie);
+       while (ch != 0) {
+               char type[32], descr[32];
+               uint32_t reg;
+
+               envsys_data_t *s = &sc->sc_sensors[sc->sc_nsensors];
+
+               if (OF_getprop(ch, "device_type", type, 32) <= 0)
+                       goto next;
+
+               if (strcmp(type, "fan-rpm-control") == 0) {
+                       s->units = ENVSYS_SFANRPM;
+               } else if (strcmp(type, "fan-pwm-control") == 0) {
+                       /* XXX we get the type from the register number */
+                       s->units = ENVSYS_SFANRPM;
+/* skip those for now since we don't really know how to interpret them */
+#if 0
+               } else if (strcmp(type, "power-sensor") == 0) {
+                       s->units = ENVSYS_SVOLTS_DC;
+#endif
+               } else if (strcmp(type, "gpi-sensor") == 0) {
+                       s->units = ENVSYS_INDICATOR;
+               } else {
+                       /* ignore other types for now */
+                       goto next;
+               }
+
+               if (OF_getprop(ch, "reg", &reg, sizeof(reg)) <= 0)
+                       goto next;
+               s->private = reg;
+
+               if (OF_getprop(ch, "location", descr, 32) <= 0)
+                       goto next;
+               strcpy(s->desc, descr);
+
+               sysmon_envsys_sensor_attach(sc->sc_sme, s);
+               sc->sc_nsensors++;
+next:
+               ch = OF_peer(ch);
+       }               
+       sysmon_envsys_register(sc->sc_sme);
+}
+
+static void
+fcu_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
+{
+       struct fcu_softc *sc = sme->sme_cookie;
+       uint8_t cmd;
+       uint16_t data = -1;
+       int error;
+
+       if (edata->units == ENVSYS_SFANRPM) {
+               cmd = edata->private + 1;
+       } else
+               cmd = edata->private; 
+
+       /* fcu is a macppc only thing so we can safely assume big endian */
+       iic_acquire_bus(sc->sc_i2c, 0);
+       error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
+           sc->sc_addr, &cmd, 1, &data, 2, 0);
+       iic_release_bus(sc->sc_i2c, 0);
+
+       if (error) {
+               edata->state = ENVSYS_SINVALID;
+               return;
+       }
+
+       edata->state = ENVSYS_SVALID;
+
+       switch (edata->units) {
+               case ENVSYS_SFANRPM:
+                       edata->value_cur = data >> 3;
+                       break;
+               case ENVSYS_SVOLTS_DC:
+                       /* XXX this reads bogus */
+                       edata->value_cur = data * 1000;
+                       break;
+               case ENVSYS_INDICATOR:
+                       /* guesswork for now */
+                       edata->value_cur = data >> 8;
+                       break;
+               default:
+                       edata->state = ENVSYS_SINVALID;
+       }       
+}
diff -r 658293c0a643 -r 46ca0b74d5c9 sys/dev/i2c/files.i2c
--- a/sys/dev/i2c/files.i2c     Thu Mar 08 23:02:50 2018 +0000
+++ b/sys/dev/i2c/files.i2c     Thu Mar 08 23:25:56 2018 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: files.i2c,v 1.84 2018/02/13 13:19:30 uwe Exp $
+#      $NetBSD: files.i2c,v 1.85 2018/03/08 23:25:56 macallan Exp $
 
 obsolete defflag       opt_i2cbus.h            I2C_SCAN
 define i2cbus { }
@@ -304,6 +304,11 @@
 attach em3027rtc at iic
 file   dev/i2c/em3027.c                        em3027rtc
 
+# Apple Fan Control Unit found in some G5
+device fcu: sysmon_envsys
+attach fcu at iic
+file   dev/i2c/fcu.c                           fcu
+
 # HID over i2c
 # HID "bus"
 define  ihidbus {[ reportid = -1 ]}



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