/* $NetBSD: gpiorfkill.c,v 1.1 2015/05/29 23:17:13 jmcneill Exp $ */

/*-
* Copyright (c) 2015 Jared D. McNeill <[email protected]>
* 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 "locators.h"

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: gpiorfkill.c,v 1.1 2015/05/29 23:17:13 jmcneill Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/device.h>
#include <sys/intr.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/gpio.h>

#include <dev/gpio/gpiovar.h>

static int      gpiorfkill_match(device_t, cfdata_t, void *);
static void     gpiorfkill_attach(device_t, device_t, void *);

struct gpiorfkill_softc {
       device_t                sc_dev;
       void                    *sc_gpio;
       struct gpio_pinmap      sc_map;
       int                     sc_pinmap[1];

       int                     sc_state;

       struct sysctllog        *sc_sysctllog;
       int                     sc_sysctlnode;
};

static void     gpiorfkill_enable(struct gpiorfkill_softc *, int);
static void     gpiorfkill_sysctl_init(struct gpiorfkill_softc *);
static int      gpiorfkill_enable_helper(SYSCTLFN_PROTO);

CFATTACH_DECL_NEW(gpiorfkill, sizeof(struct gpiorfkill_softc),
       gpiorfkill_match, gpiorfkill_attach, NULL, NULL);

static int
gpiorfkill_match(device_t parent, cfdata_t cf, void *aux)
{
       struct gpio_attach_args * const ga = aux;

       if (strcmp(ga->ga_dvname, cf->cf_name) != 0)
               return 0;

       if (ga->ga_offset == -1 || gpio_npins(ga->ga_mask) != 1)
               return 0;

       return 1;
}

static void
gpiorfkill_attach(device_t parent, device_t self, void *aux)
{
       struct gpiorfkill_softc * const sc = device_private(self);
       struct gpio_attach_args * const ga = aux;
       int caps;

       sc->sc_dev = self;
       sc->sc_gpio = ga->ga_gpio;
       sc->sc_map.pm_map = sc->sc_pinmap;
       if (gpio_pin_map(sc->sc_gpio, ga->ga_offset, ga->ga_mask,
           &sc->sc_map)) {
               aprint_error(": couldn't map pins\n");
               return;
       }

       caps = gpio_pin_caps(sc->sc_gpio, &sc->sc_map, 0);
       if ((caps & GPIO_PIN_OUTPUT) == 0) {
               aprint_error(": pin is not an output pin\n");
               return;
       }

       gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, 0, GPIO_PIN_OUTPUT);

       aprint_naive("\n");
       aprint_normal("\n");

       gpiorfkill_enable(sc, 1);
       gpiorfkill_sysctl_init(sc);
}

static void
gpiorfkill_enable(struct gpiorfkill_softc *sc, int enable)
{
       sc->sc_state = enable;
       gpio_pin_write(sc->sc_gpio, &sc->sc_map, 0, sc->sc_state);
}

static void
gpiorfkill_sysctl_init(struct gpiorfkill_softc *sc)
{
       const struct sysctlnode *node, *devnode;
       int error;

       error = sysctl_createv(&sc->sc_sysctllog, 0, NULL, &devnode,
           0, CTLTYPE_NODE, device_xname(sc->sc_dev), NULL,
           NULL, 0, NULL, 0, CTL_HW, CTL_CREATE, CTL_EOL);
       if (error)
               goto sysctl_failed;

       error = sysctl_createv(&sc->sc_sysctllog, 0, &devnode, &node,
           CTLFLAG_READWRITE, CTLTYPE_INT, "enable", NULL,
           gpiorfkill_enable_helper, 0, (void *)sc, 0,
           CTL_CREATE, CTL_EOL);
       if (error)
               goto sysctl_failed;
       sc->sc_sysctlnode = node->sysctl_num;

       return;

sysctl_failed:
       aprint_error_dev(sc->sc_dev, "couldn't create sysctl nodes (%d)\n",
           error);
       sysctl_teardown(&sc->sc_sysctllog);
}

static int
gpiorfkill_enable_helper(SYSCTLFN_ARGS)
{
       struct gpiorfkill_softc *sc;
       struct sysctlnode node;
       int error, enable;

       node = *rnode;
       sc = node.sysctl_data;
       enable = sc->sc_state;
       node.sysctl_data = &enable;
       error = sysctl_lookup(SYSCTLFN_CALL(&node));
       if (error || newp == NULL)
               return error;

       enable = !!enable;
       gpiorfkill_enable(sc, enable);

       return 0;
}

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.