NetBSD/sys/dev/i2c/am2315.c

508 lines
13 KiB
C

/* $NetBSD: am2315.c,v 1.5 2018/06/17 01:08:15 thorpej Exp $ */
/*
* Copyright (c) 2017 Brad Spencer <brad@anduin.eldar.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: am2315.c,v 1.5 2018/06/17 01:08:15 thorpej Exp $");
/*
* Driver for the Aosong AM2315
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <sys/condvar.h>
#include <sys/mutex.h>
#include <sys/time.h>
#include <dev/sysmon/sysmonvar.h>
#include <dev/i2c/i2cvar.h>
#include <dev/i2c/am2315reg.h>
#include <dev/i2c/am2315var.h>
static uint16_t am2315_crc(uint8_t *, size_t);
static int am2315_poke(struct am2315_sc *);
static int am2315_poke_m(i2c_tag_t, i2c_addr_t, const char *, bool);
static int am2315_match(device_t, cfdata_t, void *);
static void am2315_attach(device_t, device_t, void *);
static int am2315_detach(device_t, int);
static void am2315_refresh(struct sysmon_envsys *, envsys_data_t *);
static int am2315_verify_sysctl(SYSCTLFN_ARGS);
#define AM2315_DEBUG
#ifdef AM2315_DEBUG
#define DPRINTF(s, l, x) \
do { \
if (l <= s->sc_am2315debug) \
printf x; \
} while (/*CONSTCOND*/0)
#else
#define DPRINTF(s, l, x)
#endif
CFATTACH_DECL_NEW(am2315temp, sizeof(struct am2315_sc),
am2315_match, am2315_attach, am2315_detach, NULL);
static struct am2315_sensor am2315_sensors[] = {
{
.desc = "humidity",
.type = ENVSYS_SRELHUMIDITY,
},
{
.desc = "temperature",
.type = ENVSYS_STEMP,
}
};
static uint16_t
am2315_crc(uint8_t *data, size_t len)
{
uint16_t crc = 0xffff;
for (size_t j = 0; j < len; j++) {
crc ^= data[j];
for (size_t i = 0; i < 8; i++) {
if (crc & 0x01) {
crc >>= 1;
crc ^= 0xA001;
} else {
crc >>= 1;
}
}
}
return crc;
}
int
am2315_verify_sysctl(SYSCTLFN_ARGS)
{
int error, t;
struct sysctlnode node;
node = *rnode;
t = *(int *)rnode->sysctl_data;
node.sysctl_data = &t;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return error;
if (t < 0)
return EINVAL;
*(int *) rnode->sysctl_data = t;
return 0;
}
static int
am2315_cmd(i2c_tag_t tag, i2c_addr_t addr, uint8_t dir, uint8_t cmd,
uint8_t clen, uint8_t *buf, size_t blen)
{
uint8_t command[] = { dir, cmd, clen };
if (buf)
memset(buf, 0xff, blen);
uint8_t reg = dir == AM2315_READ_REGISTERS ?
I2C_OP_READ_WITH_STOP : I2C_OP_WRITE_WITH_STOP;
return iic_exec(tag, reg, addr, command,
__arraycount(command), buf, blen, 0);
}
static int
am2315_read_regs(struct am2315_sc *sc, uint8_t cmd, uint8_t clen, uint8_t *buf,
size_t blen)
{
return am2315_cmd(sc->sc_tag, sc->sc_addr, AM2315_READ_REGISTERS,
cmd, clen, buf, blen);
}
static int
am2315_poke(struct am2315_sc *sc)
{
return am2315_poke_m(sc->sc_tag, sc->sc_addr, device_xname(sc->sc_dev),
sc->sc_am2315debug >= 2);
}
static int
am2315_poke_m(i2c_tag_t tag, i2c_addr_t addr, const char *name, bool debug)
{
uint8_t buf[5];
int error;
error = am2315_cmd(tag, addr, AM2315_WRITE_REGISTERS,
AM2315_REGISTER_HIGH_USER1, 1, NULL, 0);
if (debug)
printf("%s: poke 1: %d\n", name, error);
if (error)
delay(2800);
error = am2315_cmd(tag, addr, AM2315_READ_REGISTERS,
AM2315_REGISTER_STATUS, 1, buf, __arraycount(buf));
if (debug)
printf("%s: poke 2: %d %02x %02x %02x %02x%02x\n", name, error,
buf[0], buf[1], buf[2], buf[3], buf[4]);
if (error)
delay(2800);
return error;
}
static int
am2315_match(device_t parent, cfdata_t match, void *aux)
{
struct i2c_attach_args *ia = aux;
int match_result;
if (iic_use_direct_match(ia, match, NULL, &match_result))
return match_result;
/* indirect config - check for standard address */
if (ia->ia_addr == AM2315_TYPICAL_ADDR)
return I2C_MATCH_ADDRESS_ONLY;
return 0;
}
static void
am2315_attach(device_t parent, device_t self, void *aux)
{
struct am2315_sc *sc = device_private(self);
struct i2c_attach_args *ia = aux;
uint8_t buf[11];
int error;
uint16_t crc, readcrc, model;
uint8_t chipver;
uint32_t id;
bool modelgood, chipvergood, idgood;
sc->sc_dev = self;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
sc->sc_am2315debug = 0;
sc->sc_readcount = 2;
sc->sc_readticks = 100;
sc->sc_sme = NULL;
aprint_normal("\n");
mutex_init(&sc->sc_mutex, MUTEX_DEFAULT, IPL_NONE);
mutex_init(&sc->sc_waitmutex, MUTEX_DEFAULT, IPL_NONE);
cv_init(&sc->sc_condwait, "am2315wait");
sc->sc_numsensors = __arraycount(am2315_sensors);
if ((sc->sc_sme = sysmon_envsys_create()) == NULL) {
aprint_error_dev(self, "unable to create sysmon structure\n");
return;
}
/* XXX: sysctl's not destroyed on failure */
const struct sysctlnode *cnode;
int sysctlroot_num;
if ((error = sysctl_createv(&sc->sc_am2315log, 0, NULL, &cnode, 0,
CTLTYPE_NODE, device_xname(self),
SYSCTL_DESCR("am2315 controls"), NULL, 0, NULL, 0, CTL_HW,
CTL_CREATE, CTL_EOL)) != 0)
goto badsysctl;
sysctlroot_num = cnode->sysctl_num;
#ifdef AM2315_DEBUG
if ((error = sysctl_createv(&sc->sc_am2315log, 0, NULL, &cnode,
CTLFLAG_READWRITE, CTLTYPE_INT, "debug",
SYSCTL_DESCR("Debug level"), am2315_verify_sysctl, 0,
&sc->sc_am2315debug, 0, CTL_HW, sysctlroot_num, CTL_CREATE,
CTL_EOL)) != 0)
goto badsysctl;
#endif
if ((error = sysctl_createv(&sc->sc_am2315log, 0, NULL, &cnode,
CTLFLAG_READWRITE, CTLTYPE_INT, "readcount",
SYSCTL_DESCR("Number of times to read the sensor"),
am2315_verify_sysctl, 0, &sc->sc_readcount, 0, CTL_HW,
sysctlroot_num, CTL_CREATE, CTL_EOL)) != 0)
goto badsysctl;
if ((error = sysctl_createv(&sc->sc_am2315log, 0, NULL, &cnode,
CTLFLAG_READWRITE, CTLTYPE_INT, "readticks",
SYSCTL_DESCR("Number of ticks between reads"),
am2315_verify_sysctl, 0, &sc->sc_readticks, 0, CTL_HW,
sysctlroot_num, CTL_CREATE, CTL_EOL)) != 0)
goto badsysctl;
if ((error = iic_acquire_bus(sc->sc_tag, 0)) != 0) {
aprint_error_dev(self,
"Could not acquire iic bus: %d\n", error);
return;
}
am2315_poke(sc);
#define DUMP(a) \
DPRINTF(sc, 2, ("%s: read cmd+len+%s+crcl+crch values: %02x %02x " \
"%02x%02x %02x%02x -- %02x%02x%02x%02x%02x -- %04x %04x\n", a, \
device_xname(self), buf[0], buf[1], buf[2], buf[3], \
buf[4], buf[5], buf[6], buf[7], buf[8], buf[9], \
buf[10], crc, readcrc))
error = am2315_read_regs(sc, AM2315_REGISTER_HIGH_MODEL, 2, buf, 6);
if (error)
aprint_error_dev(sc->sc_dev, "read model: %d\n", error);
readcrc = buf[5] << 8 | buf[4];
crc = am2315_crc(buf, 4);
DUMP("modh+modl");
model = buf[2] << 8 | buf[3];
modelgood = buf[0] == AM2315_READ_REGISTERS && buf[1] == 2
&& crc == readcrc;
error = am2315_read_regs(sc, AM2315_REGISTER_VERSION, 1, buf, 5);
if (error)
aprint_error_dev(self, "read chipver: %d\n", error);
readcrc = buf[4] << 8 | buf[3];
crc = am2315_crc(buf, 3);
DUMP("ver");
chipver = buf[2];
chipvergood = buf[0] == AM2315_READ_REGISTERS && buf[1] == 1
&& crc == readcrc;
error = am2315_read_regs(sc, AM2315_REGISTER_ID_PT_24_31, 2, buf, 6);
if (error)
aprint_error_dev(self, "read id 1: %d\n", error);
readcrc = buf[5] << 8 | buf[4];
crc = am2315_crc(buf, 4);
DUMP("id1+id2");
id = buf[2] << 8 | buf[3];
idgood = buf[0] == AM2315_READ_REGISTERS && buf[1] == 2
&& crc == readcrc;
error = am2315_read_regs(sc, AM2315_REGISTER_ID_PT_8_15, 2, buf, 6);
if (error)
aprint_error_dev(self, "read id 2: %d\n", error);
readcrc = buf[5] << 8 | buf[4];
crc = am2315_crc(buf, 4);
DUMP("id3+id4");
id = id << 8 | buf[2];
id = id << 8 | buf[3];
idgood = buf[0] == AM2315_READ_REGISTERS && buf[1] == 2
&& crc == readcrc && idgood;
iic_release_bus(sc->sc_tag, 0);
for (int i = 0; i < sc->sc_numsensors; i++) {
strlcpy(sc->sc_sensors[i].desc, am2315_sensors[i].desc,
sizeof(sc->sc_sensors[i].desc));
sc->sc_sensors[i].units = am2315_sensors[i].type;
sc->sc_sensors[i].state = ENVSYS_SINVALID;
DPRINTF(sc, 2, ("am2315_attach: registering sensor %d (%s)\n",
i, sc->sc_sensors[i].desc));
error = sysmon_envsys_sensor_attach(sc->sc_sme,
&sc->sc_sensors[i]);
if (error) {
aprint_error_dev(self, "unable to attach sensor %d\n",
error);
goto badregister;
}
}
sc->sc_sme->sme_name = device_xname(sc->sc_dev);
sc->sc_sme->sme_cookie = sc;
sc->sc_sme->sme_refresh = am2315_refresh;
DPRINTF(sc, 2, ("am2315_attach: registering with envsys\n"));
error = sysmon_envsys_register(sc->sc_sme);
if (error) {
aprint_error_dev(self, "unable to register with sysmon %d\n",
error);
goto badregister;
}
aprint_normal_dev(self, "Aosong AM2315, Model: %04x%s Version: %02x%s"
" ID: %08x%s",
model, (modelgood ? "," : "(inaccurate),"),
chipver, (chipvergood ? "," : "(inaccurate),"),
id, (idgood ? "\n" : "(inaccurate)\n"));
return;
badsysctl:
aprint_error_dev(self, ": can't setup sysctl tree (%d)\n", error);
return;
badregister:
sysmon_envsys_destroy(sc->sc_sme);
sc->sc_sme = NULL;
}
static void
am2315_refresh(struct sysmon_envsys * sme, envsys_data_t * edata)
{
struct am2315_sc *sc;
uint8_t buf[11], thecommand;
uint16_t crc, readcrc;
int error, rv;
uint32_t val32;
bool istempneg = false;
sc = sme->sme_cookie;
edata->state = ENVSYS_SINVALID;
mutex_enter(&sc->sc_mutex);
error = iic_acquire_bus(sc->sc_tag, 0);
if (error) {
DPRINTF(sc, 2, ("%s: Could not acquire i2c bus: %d\n",
device_xname(sc->sc_dev), error));
goto out;
}
switch (edata->sensor) {
case AM2315_HUMIDITY_SENSOR:
thecommand = AM2315_REGISTER_HIGH_RH;
break;
case AM2315_TEMP_SENSOR:
thecommand = AM2315_REGISTER_HIGH_TEMP;
break;
default:
DPRINTF(sc, 2, ("%s: bad sensor %d\n",
device_xname(sc->sc_dev), edata->sensor));
goto out;
}
for (int count = 0; ;) {
am2315_poke(sc);
if ((error = am2315_read_regs(sc, thecommand, 2, buf, 6)) != 0)
DPRINTF(sc, 2, ("%s: Read sensor %d error: %d\n",
device_xname(sc->sc_dev),edata->sensor, error));
readcrc = buf[5] << 8 | buf[4];
crc = am2315_crc(buf, 4);
DPRINTF(sc, 2, ("%s: read cmd+len+dh+dl+crch+crcl values: %02x"
" %02x %02x%02x %02x%02x -- %04x %04x -- %d\n",
device_xname(sc->sc_dev), buf[0], buf[1], buf[2],
buf[3], buf[4], buf[5], crc, readcrc, count));
if (++count == sc->sc_readcount)
break;
mutex_enter(&sc->sc_waitmutex);
rv = cv_timedwait(&sc->sc_condwait, &sc->sc_waitmutex,
sc->sc_readticks);
DPRINTF(sc, 2, ("%s: wait rv: %d\n", device_xname(sc->sc_dev),
rv));
mutex_exit(&sc->sc_waitmutex);
}
iic_release_bus(sc->sc_tag, 0);
if (buf[0] != AM2315_READ_REGISTERS || buf[1] != 2 ||
crc != readcrc) {
DPRINTF(sc, 2, ("%s: Invalid sensor data for %d\n",
device_xname(sc->sc_dev), edata->sensor));
goto out;
}
switch (edata->sensor) {
case AM2315_HUMIDITY_SENSOR:
val32 = buf[2] << 8 | buf[3];
val32 = val32 * 100000;
DPRINTF(sc, 2, ("%s: read translated values RH: %x\n",
device_xname(sc->sc_dev), val32));
edata->value_cur = val32;
edata->state = ENVSYS_SVALID;
break;
case AM2315_TEMP_SENSOR:
istempneg = (buf[2] & AM2315_TEMP_NEGATIVE);
buf[2] = buf[2] & (~AM2315_TEMP_NEGATIVE);
val32 = buf[2] << 8 | buf[3];
if (istempneg) {
val32 = 273150000 - (val32 * 100000);
} else {
val32 = (val32 * 100000) + 273150000;
}
DPRINTF(sc, 2, ("%s: read translated values TEMP: %x\n",
device_xname(sc->sc_dev), val32));
edata->value_cur = val32;
edata->state = ENVSYS_SVALID;
break;
default:
panic("bad sensor %d\n", edata->sensor);
}
out:
mutex_exit(&sc->sc_mutex);
}
static int
am2315_detach(device_t self, int flags)
{
struct am2315_sc *sc = device_private(self);
mutex_enter(&sc->sc_mutex);
/* Remove the sensors */
if (sc->sc_sme != NULL) {
sysmon_envsys_unregister(sc->sc_sme);
sc->sc_sme = NULL;
}
mutex_exit(&sc->sc_mutex);
/* Destroy the wait cond */
cv_destroy(&sc->sc_condwait);
/* Remove the sysctl tree */
sysctl_teardown(&sc->sc_am2315log);
/* Remove the mutex */
mutex_destroy(&sc->sc_waitmutex);
mutex_destroy(&sc->sc_mutex);
return 0;
}
MODULE(MODULE_CLASS_DRIVER, am2315temp, "i2cexec,sysmon_envsys");
#ifdef _MODULE
#include "ioconf.c"
#endif
static int
am2315temp_modcmd(modcmd_t cmd, void *opaque)
{
switch (cmd) {
case MODULE_CMD_INIT:
#ifdef _MODULE
return config_init_component(cfdriver_ioconf_am2315temp,
cfattach_ioconf_am2315temp, cfdata_ioconf_am2315temp);
#else
return 0;
#endif
case MODULE_CMD_FINI:
#ifdef _MODULE
return config_fini_component(cfdriver_ioconf_am2315temp,
cfattach_ioconf_am2315temp, cfdata_ioconf_am2315temp);
#else
return 0;
#endif
default:
return ENOTTY;
}
}