led.c revision 1.2.6.2
1 1.2.6.2 skrll /* $NetBSD: led.c,v 1.2.6.2 2017/08/28 17:52:00 skrll Exp $ */ 2 1.2.6.2 skrll 3 1.2.6.2 skrll /*- 4 1.2.6.2 skrll * Copyright (c) 2017 Jared McNeill <jmcneill (at) invisible.ca> 5 1.2.6.2 skrll * All rights reserved. 6 1.2.6.2 skrll * 7 1.2.6.2 skrll * Redistribution and use in source and binary forms, with or without 8 1.2.6.2 skrll * modification, are permitted provided that the following conditions 9 1.2.6.2 skrll * are met: 10 1.2.6.2 skrll * 1. Redistributions of source code must retain the above copyright 11 1.2.6.2 skrll * notice, this list of conditions and the following disclaimer. 12 1.2.6.2 skrll * 2. Redistributions in binary form must reproduce the above copyright 13 1.2.6.2 skrll * notice, this list of conditions and the following disclaimer in the 14 1.2.6.2 skrll * documentation and/or other materials provided with the distribution. 15 1.2.6.2 skrll * 16 1.2.6.2 skrll * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 1.2.6.2 skrll * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 1.2.6.2 skrll * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 1.2.6.2 skrll * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 1.2.6.2 skrll * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 1.2.6.2 skrll * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 1.2.6.2 skrll * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 1.2.6.2 skrll * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 1.2.6.2 skrll * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.2.6.2 skrll * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.2.6.2 skrll * SUCH DAMAGE. 27 1.2.6.2 skrll */ 28 1.2.6.2 skrll 29 1.2.6.2 skrll #include <sys/cdefs.h> 30 1.2.6.2 skrll __KERNEL_RCSID(0, "$NetBSD: led.c,v 1.2.6.2 2017/08/28 17:52:00 skrll Exp $"); 31 1.2.6.2 skrll 32 1.2.6.2 skrll #include <sys/param.h> 33 1.2.6.2 skrll #include <sys/systm.h> 34 1.2.6.2 skrll #include <sys/device.h> 35 1.2.6.2 skrll #include <sys/kmem.h> 36 1.2.6.2 skrll #include <sys/queue.h> 37 1.2.6.2 skrll #include <sys/sysctl.h> 38 1.2.6.2 skrll #include <sys/once.h> 39 1.2.6.2 skrll 40 1.2.6.2 skrll #include <dev/led.h> 41 1.2.6.2 skrll 42 1.2.6.2 skrll struct led_device { 43 1.2.6.2 skrll char *name; 44 1.2.6.2 skrll led_getstate_fn getstate; 45 1.2.6.2 skrll led_setstate_fn setstate; 46 1.2.6.2 skrll void *priv; 47 1.2.6.2 skrll 48 1.2.6.2 skrll struct sysctllog *slog; 49 1.2.6.2 skrll 50 1.2.6.2 skrll TAILQ_ENTRY(led_device) devices; 51 1.2.6.2 skrll }; 52 1.2.6.2 skrll 53 1.2.6.2 skrll static TAILQ_HEAD(, led_device) led_devices = 54 1.2.6.2 skrll TAILQ_HEAD_INITIALIZER(led_devices); 55 1.2.6.2 skrll static kmutex_t led_lock; 56 1.2.6.2 skrll 57 1.2.6.2 skrll static int 58 1.2.6.2 skrll led_init(void) 59 1.2.6.2 skrll { 60 1.2.6.2 skrll mutex_init(&led_lock, MUTEX_DEFAULT, IPL_NONE); 61 1.2.6.2 skrll 62 1.2.6.2 skrll return 0; 63 1.2.6.2 skrll } 64 1.2.6.2 skrll 65 1.2.6.2 skrll static struct led_device * 66 1.2.6.2 skrll led_lookup(const char *name) 67 1.2.6.2 skrll { 68 1.2.6.2 skrll struct led_device *led; 69 1.2.6.2 skrll 70 1.2.6.2 skrll KASSERT(mutex_owned(&led_lock)); 71 1.2.6.2 skrll 72 1.2.6.2 skrll TAILQ_FOREACH(led, &led_devices, devices) 73 1.2.6.2 skrll if (strcmp(led->name, name) == 0) 74 1.2.6.2 skrll return led; 75 1.2.6.2 skrll 76 1.2.6.2 skrll return NULL; 77 1.2.6.2 skrll } 78 1.2.6.2 skrll 79 1.2.6.2 skrll static void 80 1.2.6.2 skrll led_normalize_name(char *name) 81 1.2.6.2 skrll { 82 1.2.6.2 skrll unsigned char *p; 83 1.2.6.2 skrll 84 1.2.6.2 skrll for (p = (unsigned char *)name; *p; p++) 85 1.2.6.2 skrll if (!isalpha(*p) && !isdigit(*p) && *p != '-' && *p != '_') 86 1.2.6.2 skrll *p = '_'; 87 1.2.6.2 skrll } 88 1.2.6.2 skrll 89 1.2.6.2 skrll static void 90 1.2.6.2 skrll led_free(struct led_device *led) 91 1.2.6.2 skrll { 92 1.2.6.2 skrll KASSERT(mutex_owned(&led_lock)); 93 1.2.6.2 skrll 94 1.2.6.2 skrll kmem_free(led->name, strlen(led->name) + 1); 95 1.2.6.2 skrll kmem_free(led, sizeof(*led)); 96 1.2.6.2 skrll } 97 1.2.6.2 skrll 98 1.2.6.2 skrll static int 99 1.2.6.2 skrll led_sysctl_handler(SYSCTLFN_ARGS) 100 1.2.6.2 skrll { 101 1.2.6.2 skrll struct sysctlnode node; 102 1.2.6.2 skrll struct led_device *led; 103 1.2.6.2 skrll int error, state; 104 1.2.6.2 skrll 105 1.2.6.2 skrll mutex_enter(&led_lock); 106 1.2.6.2 skrll 107 1.2.6.2 skrll node = *rnode; 108 1.2.6.2 skrll led = node.sysctl_data; 109 1.2.6.2 skrll state = led->getstate(led->priv); 110 1.2.6.2 skrll node.sysctl_data = &state; 111 1.2.6.2 skrll error = sysctl_lookup(SYSCTLFN_CALL(&node)); 112 1.2.6.2 skrll if (error || newp == NULL) { 113 1.2.6.2 skrll mutex_exit(&led_lock); 114 1.2.6.2 skrll return error; 115 1.2.6.2 skrll } 116 1.2.6.2 skrll 117 1.2.6.2 skrll if (state < LED_STATE_OFF || state > LED_STATE_ON) { 118 1.2.6.2 skrll mutex_exit(&led_lock); 119 1.2.6.2 skrll return EINVAL; 120 1.2.6.2 skrll } 121 1.2.6.2 skrll 122 1.2.6.2 skrll led->setstate(led->priv, state); 123 1.2.6.2 skrll 124 1.2.6.2 skrll mutex_exit(&led_lock); 125 1.2.6.2 skrll 126 1.2.6.2 skrll return 0; 127 1.2.6.2 skrll } 128 1.2.6.2 skrll 129 1.2.6.2 skrll void * 130 1.2.6.2 skrll led_attach(const char *name, void *priv, led_getstate_fn getstate, 131 1.2.6.2 skrll led_setstate_fn setstate) 132 1.2.6.2 skrll { 133 1.2.6.2 skrll static ONCE_DECL(control); 134 1.2.6.2 skrll struct led_device *led; 135 1.2.6.2 skrll const struct sysctlnode *node; 136 1.2.6.2 skrll int error; 137 1.2.6.2 skrll 138 1.2.6.2 skrll if (RUN_ONCE(&control, led_init) != 0) 139 1.2.6.2 skrll return NULL; 140 1.2.6.2 skrll 141 1.2.6.2 skrll led = kmem_zalloc(sizeof(*led), KM_SLEEP); 142 1.2.6.2 skrll led->name = kmem_asprintf("%s", name); 143 1.2.6.2 skrll led->getstate = getstate; 144 1.2.6.2 skrll led->setstate = setstate; 145 1.2.6.2 skrll led->priv = priv; 146 1.2.6.2 skrll 147 1.2.6.2 skrll /* Convert invalid sysctl node name characters to underscores */ 148 1.2.6.2 skrll led_normalize_name(led->name); 149 1.2.6.2 skrll 150 1.2.6.2 skrll mutex_enter(&led_lock); 151 1.2.6.2 skrll if (led_lookup(name) != NULL) { 152 1.2.6.2 skrll led_free(led); 153 1.2.6.2 skrll led = NULL; 154 1.2.6.2 skrll } else { 155 1.2.6.2 skrll error = sysctl_createv(&led->slog, 0, NULL, &node, 156 1.2.6.2 skrll CTLFLAG_PERMANENT, CTLTYPE_NODE, "led", NULL, 157 1.2.6.2 skrll NULL, 0, NULL, 0, 158 1.2.6.2 skrll CTL_HW, CTL_CREATE, CTL_EOL); 159 1.2.6.2 skrll if (error == 0) { 160 1.2.6.2 skrll error = sysctl_createv(&led->slog, 0, &node, NULL, 161 1.2.6.2 skrll CTLFLAG_READWRITE, CTLTYPE_BOOL, led->name, NULL, 162 1.2.6.2 skrll led_sysctl_handler, 0, 163 1.2.6.2 skrll (void *)led, 0, 164 1.2.6.2 skrll CTL_CREATE, CTL_EOL); 165 1.2.6.2 skrll } 166 1.2.6.2 skrll if (error != 0) { 167 1.2.6.2 skrll printf("led: failed to create sysctl hw.led.%s: %d\n", 168 1.2.6.2 skrll led->name, error); 169 1.2.6.2 skrll led_free(led); 170 1.2.6.2 skrll led = NULL; 171 1.2.6.2 skrll } 172 1.2.6.2 skrll } 173 1.2.6.2 skrll if (led != NULL) 174 1.2.6.2 skrll TAILQ_INSERT_TAIL(&led_devices, led, devices); 175 1.2.6.2 skrll mutex_exit(&led_lock); 176 1.2.6.2 skrll 177 1.2.6.2 skrll return led; 178 1.2.6.2 skrll } 179 1.2.6.2 skrll 180 1.2.6.2 skrll void 181 1.2.6.2 skrll led_detach(void *handle) 182 1.2.6.2 skrll { 183 1.2.6.2 skrll struct led_device *led = handle; 184 1.2.6.2 skrll 185 1.2.6.2 skrll mutex_enter(&led_lock); 186 1.2.6.2 skrll 187 1.2.6.2 skrll TAILQ_REMOVE(&led_devices, led, devices); 188 1.2.6.2 skrll sysctl_teardown(&led->slog); 189 1.2.6.2 skrll led_free(led); 190 1.2.6.2 skrll 191 1.2.6.2 skrll mutex_exit(&led_lock); 192 1.2.6.2 skrll } 193
Indexes created Mon Oct 13 05:10:05 GMT 2025