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/*-
* Copyright (c) 2016 Andriy Gapon <avg@FreeBSD.org>
* 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/kernel.h>
#include <sys/bus.h>
#include <sys/endian.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <dev/smbus/smbconf.h>
#include <dev/smbus/smbus.h>
#include "smbus_if.h"
/*
* SMBus specification defines little-endian byte order,
* but it seems that the JEDEC devices expect it to
* be big-endian.
*/
static int
ts_readw_be(device_t dev, uint8_t reg, uint16_t *val)
{
device_t bus = device_get_parent(dev);
uint8_t addr = smbus_get_addr(dev);
int err;
err = smbus_readw(bus, addr, reg, val);
if (err != 0)
return (err);
*val = be16toh(*val);
return (0);
}
static int
ts_temp_sysctl(SYSCTL_HANDLER_ARGS)
{
device_t dev = arg1;
int err;
int temp;
uint16_t val;
err = ts_readw_be(dev, 5, &val);
if (err != 0)
return (EIO);
/*
* Convert the reading to temperature in 0.0001 Kelvins.
* Three most significant bits are flags, the next
* most significant bit is a sign bit.
* Each step is 0.0625 degrees.
*/
temp = val & 0xfff;
if ((val & 0x1000) != 0)
temp = -temp;
temp = temp * 625 + 2731500;
err = sysctl_handle_int(oidp, &temp, 0, req);
return (err);
}
static int
ts_probe(device_t dev)
{
device_set_desc(dev, "DIMM memory sensor");
return (BUS_PROBE_DEFAULT);
}
static int
ts_attach(device_t dev)
{
struct sysctl_ctx_list *ctx;
struct sysctl_oid_list *tree;
int err;
uint16_t vendorid;
uint16_t devid;
uint8_t addr;
addr = smbus_get_addr(dev);
if ((addr & 0xf0) != 0x30) {
/* Up to 8 slave devices starting at 0x30. */
return (ENXIO);
}
err = ts_readw_be(dev, 6, &vendorid);
if (err != 0) {
device_printf(dev, "failed to read Manufacturer ID\n");
return (ENXIO);
}
err = ts_readw_be(dev, 7, &devid);
if (err != 0) {
device_printf(dev, "failed to read Device ID\n");
return (ENXIO);
}
if ((devid & 0xff00) == 0x2200) {
/*
* Defined by JEDEC Standard No. 21-C, Release 26,
* Page 4.1.6 – 24
*/
} else if (vendorid == 0x104a) {
/*
* STMicroelectronics datasheets say that
* device ID and revision can vary.
* E.g. STT424E02, Doc ID 13448 Rev 8,
* section 4.6, page 26.
*/
} else if (vendorid == 0xb3 && (devid & 0xff00) == 0x2900) {
/*
* IDT TS3000B3A and TSE2002B3C chips and their variants.
* Revision IDs (the lower byte) can vary.
* http://www.idt.com/sites/default/files/documents/IDT_TSE2002B3C_DST_20100512_120303152056.pdf
* http://www.idt.com/sites/default/files/documents/IDT_TS3000B3A_DST_20101129_120303152013.pdf
*/
} else {
if (bootverbose) {
device_printf(dev, "Unknown Manufacturer and Device IDs"
", 0x%x and 0x%x\n", vendorid, devid);
}
return (ENXIO);
}
ctx = device_get_sysctl_ctx(dev);
tree = SYSCTL_CHILDREN(device_get_sysctl_tree(dev));
SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "temp",
CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, 0,
ts_temp_sysctl, "IK4", "Current temperature");
return (0);
}
static int
ts_detach(device_t dev)
{
return (0);
}
static device_method_t jedec_ts_methods[] = {
/* Methods from the device interface */
DEVMETHOD(device_probe, ts_probe),
DEVMETHOD(device_attach, ts_attach),
DEVMETHOD(device_detach, ts_detach),
/* Terminate method list */
{ 0, 0 }
};
static driver_t jedec_ts_driver = {
"jedec_ts",
jedec_ts_methods,
0 /* no softc */
};
static devclass_t jedec_ts_devclass;
DRIVER_MODULE(jedec_ts, smbus, jedec_ts_driver, jedec_ts_devclass, 0, 0);
MODULE_DEPEND(jedec_ts, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
MODULE_VERSION(jedec_ts, 1);
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