/* $NetBSD: n900_cambtn.c,v 1.2 2013/06/03 01:47:58 khorben Exp $ */
/*
* Camera button driver for the Nokia N900.
*
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Pierre Pronchery (khorben@defora.org).
*
* 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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>
__KERNEL_RCSID(0, "$NetBSD: n900_cambtn.c,v 1.2 2013/06/03 01:47:58 khorben Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/gpio.h>
#include <sys/kmem.h>
#include <dev/gpio/gpiovar.h>
#include <dev/sysmon/sysmonvar.h>
#include <dev/sysmon/sysmon_taskq.h>
#include <arm/omap/omap2_gpio.h>
/* The base interrupt for the corresponding GPIO device where this driver
* attaches. This is an ugly workaround the current limitations of gpio(4),
* which does not seem to allow a better way to locate the interrupt yet. */
#define N900CAMBTN_GPIO_BASE 160
#define N900CAMBTN_PIN_FOCUS 0
#define N900CAMBTN_PIN_CAPTURE 1
#define N900CAMBTN_NPINS 2
struct n900cambtn_softc
{
device_t sc_dev;
void * sc_gpio;
void * sc_intr[N900CAMBTN_NPINS];
struct gpio_pinmap sc_map;
int sc_map_pins[N900CAMBTN_NPINS];
struct sysmon_pswitch sc_smpsw[N900CAMBTN_NPINS];
int sc_state[N900CAMBTN_NPINS];
};
static int n900cambtn_match(device_t, cfdata_t, void *);
static void n900cambtn_attach(device_t, device_t, void *);
static int n900cambtn_detach(device_t, int);
CFATTACH_DECL_NEW(n900cambtn, sizeof(struct n900cambtn_softc),
n900cambtn_match, n900cambtn_attach, n900cambtn_detach, NULL);
static void n900cambtn_refresh(void *);
static void n900cambtn_refresh_pin(struct n900cambtn_softc *, int);
static int n900cambtn_intr(void *);
static int
n900cambtn_match(device_t parent, cfdata_t cf, void * aux)
{
struct gpio_attach_args *ga = aux;
if (strcmp(ga->ga_dvname, cf->cf_name))
return 0;
if (ga->ga_offset == -1)
return 0;
/* check that we have enough pins */
if (gpio_npins(ga->ga_mask) != N900CAMBTN_NPINS) {
aprint_debug("%s: invalid pin mask 0x%02x\n", cf->cf_name,
ga->ga_mask);
return 0;
}
return 1;
}
static void
n900cambtn_attach(device_t parent, device_t self, void *aux)
{
struct n900cambtn_softc *sc = device_private(self);
struct gpio_attach_args *ga = aux;
int caps;
sc->sc_dev = self;
sc->sc_gpio = ga->ga_gpio;
/* map pins */
sc->sc_map.pm_map = sc->sc_map_pins;
if (gpio_pin_map(sc->sc_gpio, ga->ga_offset, ga->ga_mask,
&sc->sc_map)) {
aprint_error(": couldn't map the pins\n");
return;
}
/* configure the capture pin */
caps = gpio_pin_caps(sc->sc_gpio, &sc->sc_map, N900CAMBTN_PIN_CAPTURE);
if (!(caps & GPIO_PIN_INPUT)) {
aprint_error(": pin is unable to read input\n");
gpio_pin_unmap(sc->sc_gpio, &sc->sc_map);
return;
}
gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, N900CAMBTN_PIN_CAPTURE,
GPIO_PIN_INPUT);
/* configure the focus pin */
caps = gpio_pin_caps(sc->sc_gpio, &sc->sc_map, N900CAMBTN_PIN_FOCUS);
if (!(caps & GPIO_PIN_INPUT)) {
aprint_error(": pin is unable to read input\n");
gpio_pin_unmap(sc->sc_gpio, &sc->sc_map);
return;
}
gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, N900CAMBTN_PIN_FOCUS,
GPIO_PIN_INPUT);
sc->sc_intr[0] = intr_establish(N900CAMBTN_GPIO_BASE + ga->ga_offset,
IPL_VM, IST_EDGE_BOTH, n900cambtn_intr, sc);
if (sc->sc_intr[0] == NULL) {
aprint_error(": couldn't establish interrupt\n");
return;
}
sc->sc_intr[1] = intr_establish(N900CAMBTN_GPIO_BASE + ga->ga_offset
+ 1, IPL_VM, IST_EDGE_BOTH, n900cambtn_intr, sc);
if (sc->sc_intr[1] == NULL) {
aprint_error(": couldn't establish interrupt\n");
intr_disestablish(sc->sc_intr[0]);
return;
}
aprint_normal(": N900 camera button\n");
aprint_naive(": N900 camera button\n");
if (!pmf_device_register(sc->sc_dev, NULL, NULL)) {
aprint_error_dev(sc->sc_dev,
"couldn't establish power handler\n");
}
sysmon_task_queue_init();
/* focus button */
sc->sc_smpsw[0].smpsw_name = kmem_asprintf("%s%s", device_xname(self),
"focus");
sc->sc_smpsw[0].smpsw_type = PSWITCH_TYPE_HOTKEY;
sc->sc_state[0] = PSWITCH_EVENT_RELEASED;
sysmon_pswitch_register(&sc->sc_smpsw[0]);
/* capture button */
sc->sc_smpsw[1].smpsw_name = kmem_asprintf("%s%s", device_xname(self),
"capture");
sc->sc_smpsw[1].smpsw_type = PSWITCH_TYPE_HOTKEY;
sc->sc_state[1] = PSWITCH_EVENT_RELEASED;
sysmon_pswitch_register(&sc->sc_smpsw[1]);
}
static int
n900cambtn_detach(device_t self, int flags)
{
struct n900cambtn_softc *sc = device_private(self);
if (sc->sc_intr[0] != NULL) {
intr_disestablish(sc->sc_intr[0]);
}
if (sc->sc_intr[1] != NULL) {
intr_disestablish(sc->sc_intr[1]);
}
gpio_pin_unmap(sc->sc_gpio, &sc->sc_map);
pmf_device_deregister(self);
sysmon_task_queue_fini();
return 0;
}
static int
n900cambtn_intr(void *v)
{
struct n900cambtn_softc *sc = v;
sysmon_task_queue_sched(0, n900cambtn_refresh, sc);
return 1;
}
static void
n900cambtn_refresh(void *v)
{
struct n900cambtn_softc *sc = v;
n900cambtn_refresh_pin(sc, N900CAMBTN_PIN_CAPTURE);
n900cambtn_refresh_pin(sc, N900CAMBTN_PIN_FOCUS);
}
static void
n900cambtn_refresh_pin(struct n900cambtn_softc *sc, int pin)
{
int i;
int event;
i = gpio_pin_read(sc->sc_gpio, &sc->sc_map, pin);
event = (i == GPIO_PIN_HIGH)
? PSWITCH_EVENT_RELEASED : PSWITCH_EVENT_PRESSED;
/* report the event if relevant */
if(sc->sc_state[pin] != event) {
sysmon_pswitch_event(&sc->sc_smpsw[pin], event);
sc->sc_state[pin] = event;
}
}