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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/dev/iicbus/max6690.c |
/*- * Copyright (c) 2010 Andreas Tobler * 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 AUTHOR ``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 AUTHOR 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> __FBSDID("$FreeBSD: release/9.1.0/sys/dev/iicbus/max6690.c 222674 2011-06-04 09:23:54Z andreast $"); #include <sys/param.h> #include <sys/bus.h> #include <sys/systm.h> #include <sys/module.h> #include <sys/callout.h> #include <sys/conf.h> #include <sys/cpu.h> #include <sys/ctype.h> #include <sys/kernel.h> #include <sys/reboot.h> #include <sys/rman.h> #include <sys/sysctl.h> #include <sys/limits.h> #include <machine/bus.h> #include <machine/md_var.h> #include <dev/iicbus/iicbus.h> #include <dev/iicbus/iiconf.h> #include <dev/ofw/openfirm.h> #include <dev/ofw/ofw_bus.h> #include <powerpc/powermac/powermac_thermal.h> /* Inlet, Backside, U3 Heatsink sensor: MAX6690. */ #define MAX6690_INT_TEMP 0x0 #define MAX6690_EXT_TEMP 0x1 #define MAX6690_RSL_STATUS 0x2 #define MAX6690_EEXT_TEMP 0x10 #define MAX6690_IEXT_TEMP 0x11 #define MAX6690_TEMP_MASK 0xe0 struct max6690_sensor { struct pmac_therm therm; device_t dev; int id; }; /* Regular bus attachment functions */ static int max6690_probe(device_t); static int max6690_attach(device_t); /* Utility functions */ static int max6690_sensor_read(struct max6690_sensor *sens); static int max6690_sensor_sysctl(SYSCTL_HANDLER_ARGS); static void max6690_start(void *xdev); static int max6690_read(device_t dev, uint32_t addr, uint8_t reg, uint8_t *data); struct max6690_softc { device_t sc_dev; struct intr_config_hook enum_hook; uint32_t sc_addr; struct max6690_sensor *sc_sensors; int sc_nsensors; }; static device_method_t max6690_methods[] = { /* Device interface */ DEVMETHOD(device_probe, max6690_probe), DEVMETHOD(device_attach, max6690_attach), { 0, 0 }, }; static driver_t max6690_driver = { "max6690", max6690_methods, sizeof(struct max6690_softc) }; static devclass_t max6690_devclass; DRIVER_MODULE(max6690, iicbus, max6690_driver, max6690_devclass, 0, 0); MALLOC_DEFINE(M_MAX6690, "max6690", "Temp-Monitor MAX6690"); static int max6690_read(device_t dev, uint32_t addr, uint8_t reg, uint8_t *data) { uint8_t buf[4]; uint8_t busy[1], rsl; int err, try = 0; /* Busy register RSL. */ rsl = MAX6690_RSL_STATUS; /* first read the status register, 0x2. If busy, retry. */ struct iic_msg msg[4] = { { addr, IIC_M_WR | IIC_M_NOSTOP, 1, &rsl }, { addr, IIC_M_RD, 1, busy }, { addr, IIC_M_WR | IIC_M_NOSTOP, 1, ® }, { addr, IIC_M_RD, 1, buf }, }; for (;;) { err = iicbus_transfer(dev, msg, 4); if (err != 0) goto retry; if (busy[0] & 0x80) goto retry; /* Check for invalid value and retry. */ if (buf[0] == 0xff) goto retry; *data = *((uint8_t*)buf); return (0); retry: if (++try > 5) { device_printf(dev, "iicbus read failed\n"); return (-1); } pause("max6690_read", hz); } } static int max6690_probe(device_t dev) { const char *name, *compatible; struct max6690_softc *sc; name = ofw_bus_get_name(dev); compatible = ofw_bus_get_compat(dev); if (!name) return (ENXIO); if (strcmp(name, "temp-monitor") != 0 || strcmp(compatible, "max6690") != 0) return (ENXIO); sc = device_get_softc(dev); sc->sc_dev = dev; sc->sc_addr = iicbus_get_addr(dev); device_set_desc(dev, "Temp-Monitor MAX6690"); return (0); } /* * This function returns the number of sensors. If we call it the second time * and we have allocated memory for sc->sc_sensors, we fill in the properties. */ static int max6690_fill_sensor_prop(device_t dev) { phandle_t child; struct max6690_softc *sc; u_int id[8]; char location[96]; int i = 0, j, len = 0, prop_len, prev_len = 0; sc = device_get_softc(dev); child = ofw_bus_get_node(dev); /* Fill the sensor location property. */ prop_len = OF_getprop(child, "hwsensor-location", location, sizeof(location)); while (len < prop_len) { if (sc->sc_sensors != NULL) strcpy(sc->sc_sensors[i].therm.name, location + len); prev_len = strlen(location + len) + 1; len += prev_len; i++; } if (sc->sc_sensors == NULL) return (i); /* Fill the sensor id property. */ prop_len = OF_getprop(child, "hwsensor-id", id, sizeof(id)); for (j = 0; j < i; j++) sc->sc_sensors[j].id = (id[j] & 0xf); /* Fill the sensor zone property. */ prop_len = OF_getprop(child, "hwsensor-zone", id, sizeof(id)); for (j = 0; j < i; j++) sc->sc_sensors[j].therm.zone = id[j]; /* Set up remaining sensor properties */ for (j = 0; j < i; j++) { sc->sc_sensors[j].dev = dev; sc->sc_sensors[j].therm.target_temp = 400 + ZERO_C_TO_K; sc->sc_sensors[j].therm.max_temp = 800 + ZERO_C_TO_K; sc->sc_sensors[j].therm.read = (int (*)(struct pmac_therm *))(max6690_sensor_read); } return (i); } static int max6690_attach(device_t dev) { struct max6690_softc *sc; sc = device_get_softc(dev); sc->enum_hook.ich_func = max6690_start; sc->enum_hook.ich_arg = dev; /* We have to wait until interrupts are enabled. I2C read and write * only works if the interrupts are available. * The unin/i2c is controlled by the htpic on unin. But this is not * the master. The openpic on mac-io is controlling the htpic. * This one gets attached after the mac-io probing and then the * interrupts will be available. */ if (config_intrhook_establish(&sc->enum_hook) != 0) return (ENOMEM); return (0); } static void max6690_start(void *xdev) { struct max6690_softc *sc; struct sysctl_oid *oid, *sensroot_oid; struct sysctl_ctx_list *ctx; char sysctl_name[32]; int i, j; device_t dev = (device_t)xdev; sc = device_get_softc(dev); sc->sc_nsensors = 0; /* Count the actual number of sensors. */ sc->sc_nsensors = max6690_fill_sensor_prop(dev); device_printf(dev, "%d sensors detected.\n", sc->sc_nsensors); if (sc->sc_nsensors == 0) device_printf(dev, "WARNING: No MAX6690 sensors detected!\n"); sc->sc_sensors = malloc (sc->sc_nsensors * sizeof(struct max6690_sensor), M_MAX6690, M_WAITOK | M_ZERO); ctx = device_get_sysctl_ctx(dev); sensroot_oid = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "sensor", CTLFLAG_RD, 0, "MAX6690 Sensor Information"); /* Now we can fill the properties into the allocated struct. */ sc->sc_nsensors = max6690_fill_sensor_prop(dev); /* Register with powermac_thermal */ for (i = 0; i < sc->sc_nsensors; i++) pmac_thermal_sensor_register(&sc->sc_sensors[i].therm); /* Add sysctls for the sensors. */ for (i = 0; i < sc->sc_nsensors; i++) { for (j = 0; j < strlen(sc->sc_sensors[i].therm.name); j++) { sysctl_name[j] = tolower(sc->sc_sensors[i].therm.name[j]); if (isspace(sysctl_name[j])) sysctl_name[j] = '_'; } sysctl_name[j] = 0; oid = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sensroot_oid), OID_AUTO, sysctl_name, CTLFLAG_RD, 0, "Sensor Information"); /* I use i to pass the sensor id. */ SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "temp", CTLTYPE_INT | CTLFLAG_RD, dev, i % 2, max6690_sensor_sysctl, "IK", "Sensor Temp in °C"); } /* Dump sensor location & ID. */ if (bootverbose) { device_printf(dev, "Sensors\n"); for (i = 0; i < sc->sc_nsensors; i++) { device_printf(dev, "Location : %s ID: %d\n", sc->sc_sensors[i].therm.name, sc->sc_sensors[i].id); } } config_intrhook_disestablish(&sc->enum_hook); } static int max6690_sensor_read(struct max6690_sensor *sens) { uint8_t reg_int = 0, reg_ext = 0; uint8_t integer = 0; uint8_t fraction = 0; int err, temp; struct max6690_softc *sc; sc = device_get_softc(sens->dev); /* The internal sensor id's are even, the external are odd. */ if ((sens->id % 2) == 0) { reg_int = MAX6690_INT_TEMP; reg_ext = MAX6690_IEXT_TEMP; } else { reg_int = MAX6690_EXT_TEMP; reg_ext = MAX6690_EEXT_TEMP; } err = max6690_read(sc->sc_dev, sc->sc_addr, reg_int, &integer); err = max6690_read(sc->sc_dev, sc->sc_addr, reg_ext, &fraction); if (err < 0) return (-1); fraction &= MAX6690_TEMP_MASK; /* The temperature is in tenth kelvin, the fractional part resolution is 0.125. */ temp = (integer * 10) + (fraction >> 5) * 10 / 8; return (temp + ZERO_C_TO_K); } static int max6690_sensor_sysctl(SYSCTL_HANDLER_ARGS) { device_t dev; struct max6690_softc *sc; struct max6690_sensor *sens; int error; unsigned int temp; dev = arg1; sc = device_get_softc(dev); sens = &sc->sc_sensors[arg2]; temp = max6690_sensor_read(sens); if (temp < 0) return (EIO); error = sysctl_handle_int(oidp, &temp, 0, req); return (error); }