diff options
Diffstat (limited to 'sys/dev/iicbus/ds1775.c')
| -rw-r--r-- | sys/dev/iicbus/ds1775.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/sys/dev/iicbus/ds1775.c b/sys/dev/iicbus/ds1775.c new file mode 100644 index 0000000..f066f2a --- /dev/null +++ b/sys/dev/iicbus/ds1775.c @@ -0,0 +1,255 @@ +/*- + * 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("$FreeBSD$"); + +#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> + +#define FCU_ZERO_C_TO_K 2732 + +/* Drivebay sensor: LM75/DS1775. */ +#define DS1775_TEMP 0x0 + +struct ds1775_sensor { + char location[32]; +}; + +/* Regular bus attachment functions */ +static int ds1775_probe(device_t); +static int ds1775_attach(device_t); + +/* Utility functions */ +static int ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS); +static void ds1775_start(void *xdev); +static int ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, + uint16_t *data); + +struct ds1775_softc { + device_t sc_dev; + struct intr_config_hook enum_hook; + uint32_t sc_addr; + struct ds1775_sensor *sc_sensors; + +}; +static device_method_t ds1775_methods[] = { + /* Device interface */ + DEVMETHOD(device_probe, ds1775_probe), + DEVMETHOD(device_attach, ds1775_attach), + { 0, 0 }, +}; + +static driver_t ds1775_driver = { + "ds1775", + ds1775_methods, + sizeof(struct ds1775_softc) +}; + +static devclass_t ds1775_devclass; + +DRIVER_MODULE(ds1755, iicbus, ds1775_driver, ds1775_devclass, 0, 0); +MALLOC_DEFINE(M_DS1775, "ds1775", "Temp-Monitor DS1775"); + +static int +ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, uint16_t *data) +{ + uint8_t buf[4]; + + struct iic_msg msg[2] = { + { addr, IIC_M_WR | IIC_M_NOSTOP, 1, ® }, + { addr, IIC_M_RD, 2, buf }, + }; + + if (iicbus_transfer(dev, msg, 2) != 0) { + device_printf(dev, "iicbus read failed\n"); + return (EIO); + } + + *data = *((uint16_t*)buf); + + return (0); +} + +static int +ds1775_probe(device_t dev) +{ + const char *name, *compatible; + struct ds1775_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, "ds1775") != 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 DS1755"); + + return (0); +} + +static int +ds1775_attach(device_t dev) +{ + struct ds1775_softc *sc; + + sc = device_get_softc(dev); + + sc->enum_hook.ich_func = ds1775_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 +ds1775_start(void *xdev) +{ + phandle_t child; + struct ds1775_softc *sc; + struct ds1775_sensor *sens; + struct sysctl_oid *sensroot_oid; + struct sysctl_ctx_list *ctx; + int i; + char sysctl_name[40], sysctl_desc[40]; + const char *units; + + device_t dev = (device_t)xdev; + + sc = device_get_softc(dev); + + child = ofw_bus_get_node(dev); + + sc->sc_sensors = malloc (sizeof(struct ds1775_sensor), + M_DS1775, M_WAITOK | M_ZERO); + + sens = sc->sc_sensors; + + ctx = device_get_sysctl_ctx(dev); + sensroot_oid = device_get_sysctl_tree(dev); + + OF_getprop(child, "hwsensor-location", sens->location, + sizeof(sens->location)); + units = "C"; + + for (i = 0; i < strlen(sens->location); i++) { + sysctl_name[i] = tolower(sens->location[i]); + if (isspace(sysctl_name[i])) + sysctl_name[i] = '_'; + } + sysctl_name[i] = 0; + + sprintf(sysctl_desc,"%s (%s)", sens->location, units); + SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(sensroot_oid), OID_AUTO, + sysctl_name, + CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, + 0, ds1775_sensor_sysctl, "IK", sysctl_desc); + + config_intrhook_disestablish(&sc->enum_hook); +} + +static int +ds1775_sensor_read(device_t dev, struct ds1775_sensor *sens, int *temp) +{ + struct ds1775_softc *sc; + uint16_t buf[2]; + uint16_t read; + + sc = device_get_softc(dev); + + ds1775_read_2(sc->sc_dev, sc->sc_addr, DS1775_TEMP, buf); + + read = *((int16_t *)buf); + + /* The default mode of the ADC is 9 bit, the resolution is 0.5 C per + bit. The temperature is in tenth kelvin. + */ + *temp = ((int16_t)(read) >> 7) * 5; + + return (0); +} +static int +ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS) +{ + device_t dev; + struct ds1775_softc *sc; + struct ds1775_sensor *sens; + int value; + int error; + unsigned int temp; + + dev = arg1; + sc = device_get_softc(dev); + sens = &sc->sc_sensors[arg2]; + + error = ds1775_sensor_read(dev, sens, &value); + if (error != 0) + return (error); + + temp = value + FCU_ZERO_C_TO_K; + + error = sysctl_handle_int(oidp, &temp, 0, req); + + return (error); +} |
