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      1 /* $NetBSD: gpiorfkill.c,v 1.1 2015/05/29 23:17:13 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include "locators.h"
     30 
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: gpiorfkill.c,v 1.1 2015/05/29 23:17:13 jmcneill Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/bus.h>
     36 #include <sys/device.h>
     37 #include <sys/intr.h>
     38 #include <sys/systm.h>
     39 #include <sys/kernel.h>
     40 #include <sys/sysctl.h>
     41 #include <sys/gpio.h>
     42 
     43 #include <dev/gpio/gpiovar.h>
     44 
     45 static int	gpiorfkill_match(device_t, cfdata_t, void *);
     46 static void	gpiorfkill_attach(device_t, device_t, void *);
     47 
     48 struct gpiorfkill_softc {
     49 	device_t		sc_dev;
     50 	void			*sc_gpio;
     51 	struct gpio_pinmap	sc_map;
     52 	int			sc_pinmap[1];
     53 
     54 	int			sc_state;
     55 
     56 	struct sysctllog	*sc_sysctllog;
     57 	int			sc_sysctlnode;
     58 };
     59 
     60 static void	gpiorfkill_enable(struct gpiorfkill_softc *, int);
     61 static void	gpiorfkill_sysctl_init(struct gpiorfkill_softc *);
     62 static int	gpiorfkill_enable_helper(SYSCTLFN_PROTO);
     63 
     64 CFATTACH_DECL_NEW(gpiorfkill, sizeof(struct gpiorfkill_softc),
     65 	gpiorfkill_match, gpiorfkill_attach, NULL, NULL);
     66 
     67 static int
     68 gpiorfkill_match(device_t parent, cfdata_t cf, void *aux)
     69 {
     70 	struct gpio_attach_args * const ga = aux;
     71 
     72 	if (strcmp(ga->ga_dvname, cf->cf_name) != 0)
     73 		return 0;
     74 
     75 	if (ga->ga_offset == -1 || gpio_npins(ga->ga_mask) != 1)
     76 		return 0;
     77 
     78 	return 1;
     79 }
     80 
     81 static void
     82 gpiorfkill_attach(device_t parent, device_t self, void *aux)
     83 {
     84 	struct gpiorfkill_softc * const sc = device_private(self);
     85 	struct gpio_attach_args * const ga = aux;
     86 	int caps;
     87 
     88 	sc->sc_dev = self;
     89 	sc->sc_gpio = ga->ga_gpio;
     90 	sc->sc_map.pm_map = sc->sc_pinmap;
     91 	if (gpio_pin_map(sc->sc_gpio, ga->ga_offset, ga->ga_mask,
     92 	    &sc->sc_map)) {
     93 		aprint_error(": couldn't map pins\n");
     94 		return;
     95 	}
     96 
     97 	caps = gpio_pin_caps(sc->sc_gpio, &sc->sc_map, 0);
     98 	if ((caps & GPIO_PIN_OUTPUT) == 0) {
     99 		aprint_error(": pin is not an output pin\n");
    100 		return;
    101 	}
    102 
    103 	gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, 0, GPIO_PIN_OUTPUT);
    104 
    105 	aprint_naive("\n");
    106 	aprint_normal("\n");
    107 
    108 	gpiorfkill_enable(sc, 1);
    109 	gpiorfkill_sysctl_init(sc);
    110 }
    111 
    112 static void
    113 gpiorfkill_enable(struct gpiorfkill_softc *sc, int enable)
    114 {
    115 	sc->sc_state = enable;
    116 	gpio_pin_write(sc->sc_gpio, &sc->sc_map, 0, sc->sc_state);
    117 }
    118 
    119 static void
    120 gpiorfkill_sysctl_init(struct gpiorfkill_softc *sc)
    121 {
    122 	const struct sysctlnode *node, *devnode;
    123 	int error;
    124 
    125 	error = sysctl_createv(&sc->sc_sysctllog, 0, NULL, &devnode,
    126 	    0, CTLTYPE_NODE, device_xname(sc->sc_dev), NULL,
    127 	    NULL, 0, NULL, 0, CTL_HW, CTL_CREATE, CTL_EOL);
    128 	if (error)
    129 		goto sysctl_failed;
    130 
    131 	error = sysctl_createv(&sc->sc_sysctllog, 0, &devnode, &node,
    132 	    CTLFLAG_READWRITE, CTLTYPE_INT, "enable", NULL,
    133 	    gpiorfkill_enable_helper, 0, (void *)sc, 0,
    134 	    CTL_CREATE, CTL_EOL);
    135 	if (error)
    136 		goto sysctl_failed;
    137 	sc->sc_sysctlnode = node->sysctl_num;
    138 
    139 	return;
    140 
    141 sysctl_failed:
    142 	aprint_error_dev(sc->sc_dev, "couldn't create sysctl nodes (%d)\n",
    143 	    error);
    144 	sysctl_teardown(&sc->sc_sysctllog);
    145 }
    146 
    147 static int
    148 gpiorfkill_enable_helper(SYSCTLFN_ARGS)
    149 {
    150 	struct gpiorfkill_softc *sc;
    151 	struct sysctlnode node;
    152 	int error, enable;
    153 
    154 	node = *rnode;
    155 	sc = node.sysctl_data;
    156 	enable = sc->sc_state;
    157 	node.sysctl_data = &enable;
    158 	error = sysctl_lookup(SYSCTLFN_CALL(&node));
    159 	if (error || newp == NULL)
    160 		return error;
    161 
    162 	enable = !!enable;
    163 	gpiorfkill_enable(sc, enable);
    164 
    165 	return 0;
    166 }
    167