d0beb2c412
- ds1374u : use multi-byte write. - at24co2n, max6657: remove mutex, iicbus has the necessary locking. Submitted by: Sreekanth M. S. (kanthms at netlogicmicro com)
159 lines
4.3 KiB
C
159 lines
4.3 KiB
C
/*-
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* Copyright (c) 2003-2009 RMI Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of RMI Corporation, nor the names of its contributors,
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* RMI_BSD */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* temperature sensor chip sitting on the I2C bus.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/bus.h>
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#include <sys/resource.h>
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#include <sys/rman.h>
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#include <sys/sysctl.h>
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#include <machine/bus.h>
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#include <machine/cpu.h>
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#include <machine/cpufunc.h>
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#include <machine/frame.h>
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#include <machine/resource.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/iicbus/iicbus.h>
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#include <mips/rmi/board.h>
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#include <mips/rmi/rmi_boot_info.h>
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#include "iicbus_if.h"
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#define MAX6657_EXT_TEMP 1
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struct max6657_softc {
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uint32_t sc_addr;
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device_t sc_dev;
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int sc_curtemp;
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int sc_lastupdate; /* in ticks */
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};
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static void max6657_update(struct max6657_softc *);
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static int max6657_read(device_t dev, uint32_t addr, int reg) ;
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static int
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max6657_probe(device_t dev)
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{
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device_set_desc(dev, "MAX6657MSA Temperature Sensor");
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return (0);
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}
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static int
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max6657_sysctl_temp(SYSCTL_HANDLER_ARGS)
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{
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struct max6657_softc *sc = arg1;
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int temp;
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max6657_update(sc);
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temp = sc->sc_curtemp ;
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return sysctl_handle_int(oidp, &temp, 0, req);
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}
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static int
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max6657_attach(device_t dev)
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{
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struct max6657_softc *sc = device_get_softc(dev);
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struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(dev);
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struct sysctl_oid *tree = device_get_sysctl_tree(dev);
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if(sc==NULL) {
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printf("max6657_attach device_get_softc failed\n");
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return (0);
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}
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sc->sc_dev = dev;
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sc->sc_addr = iicbus_get_addr(dev);
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SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
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"temp", CTLTYPE_INT | CTLFLAG_RD, sc, 0,
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max6657_sysctl_temp, "I", "operating temperature");
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device_printf(dev, "Chip temperature {%d} Degree Celsius\n",
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max6657_read(sc->sc_dev, sc->sc_addr, MAX6657_EXT_TEMP));
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return (0);
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}
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static int
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max6657_read(device_t dev, uint32_t slave_addr, int reg)
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{
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uint8_t addr = reg;
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uint8_t data[1];
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struct iic_msg msgs[2] = {
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{ slave_addr, IIC_M_WR, 1, &addr },
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{ slave_addr, IIC_M_RD, 1, data },
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};
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return iicbus_transfer(dev, msgs, 2) != 0 ? -1 : data[0];
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}
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static void
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max6657_update(struct max6657_softc *sc)
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{
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int v;
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/* NB: no point in updating any faster than the chip */
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if (ticks - sc->sc_lastupdate > hz) {
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v = max6657_read(sc->sc_dev, sc->sc_addr, MAX6657_EXT_TEMP);
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if (v >= 0)
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sc->sc_curtemp = v;
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sc->sc_lastupdate = ticks;
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}
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}
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static device_method_t max6657_methods[] = {
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DEVMETHOD(device_probe, max6657_probe),
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DEVMETHOD(device_attach, max6657_attach),
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{0, 0},
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};
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static driver_t max6657_driver = {
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"max6657",
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max6657_methods,
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sizeof(struct max6657_softc),
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};
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static devclass_t max6657_devclass;
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DRIVER_MODULE(max6657, iicbus, max6657_driver, max6657_devclass, 0, 0);
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MODULE_VERSION(max6657, 1);
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MODULE_DEPEND(max6657, iicbus, 1, 1, 1);
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