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/* $OpenBSD: utrh.c,v 1.3 2010/02/18 23:34:05 deraadt Exp $ */
/*
* Copyright (c) 2009 Yojiro UO <yuo@nui.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 DISCAIMS 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.
*/
/* Driver for Strawberry linux USBRH Temerature/Humidity sensor */
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/sensors.h>
#include <dev/usb/usb.h>
#include <dev/usb/usbhid.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>
#include <dev/usb/usbdevs.h>
#include <dev/usb/uhidev.h>
#include <dev/usb/hid.h>
#ifdef USB_DEBUG
#define UTRH_DEBUG
#endif
#ifdef UTRH_DEBUG
int utrhdebug = 0;
#define DPRINTFN(n, x) do { if (utrhdebug > (n)) printf x; } while (0)
#else
#define DPRINTFN(n, x)
#endif
#define DPRINTF(x) DPRINTFN(0, x)
/* sensors */
#define UTRH_TEMP 0
#define UTRH_HUMIDITY 1
#define UTRH_MAX_SENSORS 2
struct utrh_softc {
struct uhidev sc_hdev;
usbd_device_handle sc_udev;
u_char sc_dying;
uint16_t sc_flag;
/* uhidev parameters */
size_t sc_flen; /* feature report length */
size_t sc_ilen; /* input report length */
size_t sc_olen; /* output report length */
uint8_t *sc_ibuf;
/* sensor framework */
struct ksensor sc_sensor[UTRH_MAX_SENSORS];
struct ksensordev sc_sensordev;
struct sensor_task *sc_sensortask;
uint8_t sc_num_sensors;
};
const struct usb_devno utrh_devs[] = {
{ USB_VENDOR_STRAWBERRYLINUX, USB_PRODUCT_STRAWBERRYLINUX_USBRH},
};
#define utrh_lookup(v, p) usb_lookup(utrh_devs, v, p)
int utrh_match(struct device *, void *, void *);
void utrh_attach(struct device *, struct device *, void *);
int utrh_detach(struct device *, int);
int utrh_activate(struct device *, int);
int utrh_sht1x_temp(unsigned int);
int utrh_sht1x_rh(unsigned int, int);
void utrh_intr(struct uhidev *, void *, u_int);
void utrh_refresh(void *);
struct cfdriver utrh_cd = {
NULL, "utrh", DV_DULL
};
const struct cfattach utrh_ca = {
sizeof(struct utrh_softc),
utrh_match,
utrh_attach,
utrh_detach,
utrh_activate,
};
int
utrh_match(struct device *parent, void *match, void *aux)
{
struct usb_attach_arg *uaa = aux;
struct uhidev_attach_arg *uha = (struct uhidev_attach_arg *)uaa;
if (utrh_lookup(uha->uaa->vendor, uha->uaa->product) == NULL)
return UMATCH_NONE;
return (UMATCH_VENDOR_PRODUCT);
}
void
utrh_attach(struct device *parent, struct device *self, void *aux)
{
struct utrh_softc *sc = (struct utrh_softc *)self;
struct usb_attach_arg *uaa = aux;
struct uhidev_attach_arg *uha = (struct uhidev_attach_arg *)uaa;
usbd_device_handle dev = uha->parent->sc_udev;
int size, repid, err;
void *desc;
sc->sc_udev = dev;
sc->sc_hdev.sc_intr = utrh_intr;
sc->sc_hdev.sc_parent = uha->parent;
sc->sc_hdev.sc_report_id = uha->reportid;
sc->sc_num_sensors = 0;
uhidev_get_report_desc(uha->parent, &desc, &size);
repid = uha->reportid;
sc->sc_ilen = hid_report_size(desc, size, hid_input, repid);
sc->sc_olen = hid_report_size(desc, size, hid_output, repid);
sc->sc_flen = hid_report_size(desc, size, hid_feature, repid);
err = uhidev_open(&sc->sc_hdev);
if (err) {
printf("utrh_open: uhidev_open %d\n", err);
return;
}
sc->sc_ibuf = malloc(sc->sc_ilen, M_USBDEV, M_WAITOK);
usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->sc_udev,
&sc->sc_hdev.sc_dev);
printf("\n");
/* attach sensor */
strlcpy(sc->sc_sensordev.xname, sc->sc_hdev.sc_dev.dv_xname,
sizeof(sc->sc_sensordev.xname));
sc->sc_sensor[UTRH_TEMP].type = SENSOR_TEMP;
sc->sc_sensor[UTRH_TEMP].flags = SENSOR_FINVALID;
strlcpy(sc->sc_sensor[UTRH_HUMIDITY].desc, "humidity",
sizeof(sc->sc_sensor[UTRH_HUMIDITY].desc));
sc->sc_sensor[UTRH_HUMIDITY].type = SENSOR_PERCENT;
sc->sc_sensor[UTRH_HUMIDITY].flags = SENSOR_FINVALID;
sensor_attach(&sc->sc_sensordev, &sc->sc_sensor[UTRH_TEMP]);
sensor_attach(&sc->sc_sensordev, &sc->sc_sensor[UTRH_HUMIDITY]);
sc->sc_num_sensors = 2;
if (sc->sc_num_sensors > 0) {
sc->sc_sensortask = sensor_task_register(sc, utrh_refresh, 6);
if (sc->sc_sensortask == NULL) {
printf(", unable to register update task\n");
return;
}
sensordev_install(&sc->sc_sensordev);
}
DPRINTF(("utrh_attach: complete\n"));
}
int
utrh_detach(struct device *self, int flags)
{
struct utrh_softc *sc = (struct utrh_softc *)self;
int i, rv = 0;
sc->sc_dying = 1;
if (sc->sc_num_sensors > 0) {
wakeup(&sc->sc_sensortask);
sensordev_deinstall(&sc->sc_sensordev);
for (i = 0; i < sc->sc_num_sensors; i++)
sensor_detach(&sc->sc_sensordev, &sc->sc_sensor[i]);
if (sc->sc_sensortask != NULL)
sensor_task_unregister(sc->sc_sensortask);
}
if (sc->sc_ibuf != NULL) {
free(sc->sc_ibuf, M_USBDEV);
sc->sc_ibuf = NULL;
}
usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev,
&sc->sc_hdev.sc_dev);
return (rv);
}
int
utrh_activate(struct device *self, int act)
{
struct utrh_softc *sc = (struct utrh_softc *)self;
switch (act) {
case DVACT_ACTIVATE:
break;
case DVACT_DEACTIVATE:
sc->sc_dying = 1;
break;
}
return (0);
}
void
utrh_intr(struct uhidev *addr, void *ibuf, u_int len)
{
struct utrh_softc *sc = (struct utrh_softc *)addr;
if (sc->sc_ibuf == NULL)
return;
/* receive sensor data */
memcpy(sc->sc_ibuf, ibuf, len);
return;
}
void
utrh_refresh(void *arg)
{
struct utrh_softc *sc = arg;
unsigned int temp_tick, humidity_tick;
int temp, rh;
/* issue query */
uint8_t cmdbuf[] = {0x31, 0x15, 0x00, 0x00, 0x00, 0x00, 0x00};
if (uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT,
cmdbuf, sc->sc_olen))
return;
/* wait till sensor data are updated, 1s will be enough */
tsleep(&sc->sc_sensortask, 0, "utrh", (1*hz));
temp_tick = (sc->sc_ibuf[2] * 256 + sc->sc_ibuf[3]) & 0x3fff;
humidity_tick = (sc->sc_ibuf[0] * 256 + sc->sc_ibuf[1]) & 0x0fff;
temp = utrh_sht1x_temp(temp_tick);
rh = utrh_sht1x_rh(humidity_tick, temp);
sc->sc_sensor[UTRH_TEMP].value = (temp * 10000) + 273150000;
sc->sc_sensor[UTRH_TEMP].flags &= ~SENSOR_FINVALID;
sc->sc_sensor[UTRH_HUMIDITY].value = rh;
sc->sc_sensor[UTRH_HUMIDITY].flags &= ~SENSOR_FINVALID;
}
/* return C-degree * 100 value */
int
utrh_sht1x_temp(unsigned int ticks)
{
return (ticks - 4010);
}
/* return %RH * 1000 */
int
utrh_sht1x_rh(unsigned int ticks, int temp)
{
int rh_l, rh;
rh_l = (-40000 + 405 * ticks) - ((7 * ticks * ticks) / 250);
rh = ((temp - 2500) * (1 + (ticks >> 7)) + rh_l) / 10;
return rh;
}
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