194 lines
4.9 KiB
C
194 lines
4.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2021 Alstom Group.
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* Copyright (c) 2021 Semihalf.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_platform.h"
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/module.h>
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#include <sys/ctype.h>
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#include <sys/kernel.h>
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#include <sys/libkern.h>
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#include <sys/sysctl.h>
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#include <dev/iicbus/iicbus.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/ofw/ofw_bus.h>
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#define BIT(x) (1UL << (x))
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#define TMP461_LOCAL_TEMP_REG_MSB 0x0
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#define TMP461_LOCAL_TEMP_REG_LSB 0x15
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#define TMP461_GLOBAL_TEMP_REG_MSB 0x1
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#define TMP461_GLOBAL_TEMP_REG_LSB 0x10
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#define TMP461_CONFIG_REG 0x3
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#define TMP461_CONFIG_REG_TEMP_RANGE_BIT BIT(2)
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#define TMP461_EXTENDED_TEMP_MODIFIER 64
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/* 28.4 fixed point representation of 273.15f */
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#define TMP461_C_TO_K_FIX 4370
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#define TMP461_TEMP_LSB 0
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static int tmp461_probe(device_t dev);
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static int tmp461_attach(device_t dev);
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static int tmp461_read_1(device_t dev, uint8_t reg, uint8_t *data);
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static int tmp461_read_temp(device_t dev, int32_t *temp);
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static int tmp461_detach(device_t dev);
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static int tmp461_sensor_sysctl(SYSCTL_HANDLER_ARGS);
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static device_method_t tmp461_methods[] = {
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DEVMETHOD(device_probe, tmp461_probe),
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DEVMETHOD(device_attach, tmp461_attach),
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DEVMETHOD(device_detach, tmp461_detach),
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DEVMETHOD_END
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};
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static driver_t tmp461_driver = {
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"tmp461_dev",
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tmp461_methods,
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0
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};
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static devclass_t tmp461_devclass;
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static struct ofw_compat_data tmp461_compat_data[] = {
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{ "ti,tmp461", 1 },
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{ NULL, 0 }
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};
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DRIVER_MODULE(tmp461, iicbus, tmp461_driver, tmp461_devclass, 0, 0);
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IICBUS_FDT_PNP_INFO(tmp461_compat_data);
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static int
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tmp461_attach(device_t dev)
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{
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struct sysctl_oid *sensor_root_oid;
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struct sysctl_ctx_list *ctx;
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ctx = device_get_sysctl_ctx(dev);
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sensor_root_oid = SYSCTL_ADD_NODE(ctx, SYSCTL_STATIC_CHILDREN(_hw),
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OID_AUTO, "temperature", CTLFLAG_RD | CTLFLAG_MPSAFE, NULL,
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"TMP 461 Thermal Sensor Information");
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if (sensor_root_oid == NULL)
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return (ENXIO);
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SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(sensor_root_oid), OID_AUTO,
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"tmp461", CTLTYPE_INT | CTLFLAG_RD, dev, 0,
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tmp461_sensor_sysctl, "IK0", "TMP461 Thermal Sensor");
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return (0);
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}
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static int
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tmp461_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (!ofw_bus_search_compatible(dev, tmp461_compat_data)->ocd_data)
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return (ENXIO);
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device_set_desc(dev, "TMP461 Thermal Sensor");
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return (BUS_PROBE_GENERIC);
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}
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static int
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tmp461_detach(device_t dev)
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{
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return (0);
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}
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static int
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tmp461_read_1(device_t dev, uint8_t reg, uint8_t *data)
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{
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int error;
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error = iicdev_readfrom(dev, reg, (void *) data, 1, IIC_WAIT);
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if (error != 0)
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device_printf(dev, "Failed to read from device\n");
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return (error);
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}
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static int
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tmp461_read_temp(device_t dev, int32_t *temp)
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{
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bool extended_mode;
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uint8_t data;
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int error;
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/* read temperature range */
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error = tmp461_read_1(dev, TMP461_CONFIG_REG, &data);
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if (error != 0)
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return (ENXIO);
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extended_mode = data & TMP461_CONFIG_REG_TEMP_RANGE_BIT;
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/* read temp MSB */
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error = tmp461_read_1(dev, TMP461_LOCAL_TEMP_REG_MSB, &data);
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if (error != 0)
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return (ENXIO);
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*temp = signed_extend32(data, TMP461_TEMP_LSB, 8) -
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(extended_mode ? TMP461_EXTENDED_TEMP_MODIFIER : 0);
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error = tmp461_read_1(dev, TMP461_LOCAL_TEMP_REG_LSB, &data);
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if (error != 0)
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return (ENXIO);
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*temp = (((*temp << 4) | (data >> 4)) + TMP461_C_TO_K_FIX) >> 4;
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return (0);
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}
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static int
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tmp461_sensor_sysctl(SYSCTL_HANDLER_ARGS)
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{
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device_t dev;
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int32_t temp;
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int error;
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dev = arg1;
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error = tmp461_read_temp(dev, &temp);
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if (error != 0)
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return (error);
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return (sysctl_handle_int(oidp, &temp, 0, req));
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}
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