diff options
Diffstat (limited to 'sys/dev/iicbus')
| -rw-r--r-- | sys/dev/iicbus/adm1030.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/sys/dev/iicbus/adm1030.c b/sys/dev/iicbus/adm1030.c new file mode 100644 index 0000000..6a28a73 --- /dev/null +++ b/sys/dev/iicbus/adm1030.c @@ -0,0 +1,240 @@ +/*- + * Copyright (c) 2011 Justin Hibbits + * 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/kthread.h> +#include <sys/limits.h> +#include <sys/reboot.h> +#include <sys/rman.h> +#include <sys/sysctl.h> +#include <sys/unistd.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> + +struct adm1030_softc { + struct pmac_fan fan; + device_t sc_dev; + struct intr_config_hook enum_hook; + uint32_t sc_addr; + int sc_pwm; +}; + +/* Regular bus attachment functions */ +static int adm1030_probe(device_t); +static int adm1030_attach(device_t); + +/* Utility functions */ +static void adm1030_start(void *xdev); +static int adm1030_write_byte(device_t dev, uint32_t addr, uint8_t reg, uint8_t buf); +static int adm1030_set(struct adm1030_softc *fan, int pwm); +static int adm1030_sysctl(SYSCTL_HANDLER_ARGS); + +static device_method_t adm1030_methods[] = { + /* Device interface */ + DEVMETHOD(device_probe, adm1030_probe), + DEVMETHOD(device_attach, adm1030_attach), + {0, 0}, +}; + +static driver_t adm1030_driver = { + "adm1030", + adm1030_methods, + sizeof(struct adm1030_softc) +}; + +static devclass_t adm1030_devclass; + +DRIVER_MODULE(adm1030, iicbus, adm1030_driver, adm1030_devclass, 0, 0); + +static int +adm1030_write_byte(device_t dev, uint32_t addr, uint8_t reg, uint8_t byte) +{ + unsigned char buf[4]; + int try = 0; + + struct iic_msg msg[] = { + {addr, IIC_M_WR, 0, buf} + }; + + msg[0].len = 2; + buf[0] = reg; + buf[1] = byte; + + for (;;) + { + if (iicbus_transfer(dev, msg, 1) == 0) + return (0); + + if (++try > 5) { + device_printf(dev, "iicbus write failed\n"); + return (-1); + } + pause("adm1030_write_byte", hz); + } +} + +static int +adm1030_probe(device_t dev) +{ + const char *name, *compatible; + struct adm1030_softc *sc; + phandle_t handle; + phandle_t thermostat; + + name = ofw_bus_get_name(dev); + compatible = ofw_bus_get_compat(dev); + handle = ofw_bus_get_node(dev); + + if (!name) + return (ENXIO); + + if (strcmp(name, "fan") != 0 || strcmp(compatible, "adm1030") != 0) + return (ENXIO); + + /* This driver can only be used if there's an associated temp sensor. */ + if (OF_getprop(handle, "platform-getTemp", &thermostat, sizeof(thermostat)) < 0) + return (ENXIO); + + sc = device_get_softc(dev); + sc->sc_dev = dev; + sc->sc_addr = iicbus_get_addr(dev); + + device_set_desc(dev, "G4 MDD Fan driver"); + + return (0); +} + +static int +adm1030_attach(device_t dev) +{ + struct adm1030_softc *sc; + struct sysctl_ctx_list *ctx; + struct sysctl_oid *tree; + + sc = device_get_softc(dev); + + sc->enum_hook.ich_func = adm1030_start; + sc->enum_hook.ich_arg = dev; + + /* + * Wait until interrupts are available, which won't be until the openpic is + * intialized. + */ + + if (config_intrhook_establish(&sc->enum_hook) != 0) + return (ENOMEM); + + ctx = device_get_sysctl_ctx(dev); + tree = device_get_sysctl_tree(dev); + SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, "pwm", + CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, dev, + 0, adm1030_sysctl, "I", "Fan PWM Rate"); + + return (0); +} + +static void +adm1030_start(void *xdev) +{ + struct adm1030_softc *sc; + + device_t dev = (device_t) xdev; + + sc = device_get_softc(dev); + + /* Start the adm1030 device. */ + adm1030_write_byte(sc->sc_dev, sc->sc_addr, 0x1, 0x1); + adm1030_write_byte(sc->sc_dev, sc->sc_addr, 0x0, 0x95); + adm1030_write_byte(sc->sc_dev, sc->sc_addr, 0x23, 0x91); + + /* Use the RPM fields as PWM duty cycles. */ + sc->fan.min_rpm = 0; + sc->fan.max_rpm = 0x0F; + sc->fan.default_rpm = 2; + + strcpy(sc->fan.name, "MDD Case fan"); + sc->fan.zone = 0; + sc->fan.read = NULL; + sc->fan.set = (int (*)(struct pmac_fan *, int))adm1030_set; + config_intrhook_disestablish(&sc->enum_hook); + + pmac_thermal_fan_register(&sc->fan); +} + +static int adm1030_set(struct adm1030_softc *fan, int pwm) +{ + /* Clamp the PWM to 0-0xF, one nibble. */ + if (pwm > 0xF) + pwm = 0xF; + if (pwm < 0) + pwm = 0; + + if (adm1030_write_byte(fan->sc_dev, fan->sc_addr, 0x22, pwm) < 0) + return (-1); + + fan->sc_pwm = pwm; + return (0); +} + +static int +adm1030_sysctl(SYSCTL_HANDLER_ARGS) +{ + device_t adm1030; + struct adm1030_softc *sc; + int pwm, error; + + adm1030 = arg1; + sc = device_get_softc(adm1030); + + pwm = sc->sc_pwm; + + error = sysctl_handle_int(oidp, &pwm, 0, req); + + if (error || !req->newptr) + return (error); + + return (adm1030_set(sc, pwm)); +} |
