1 /* $NetBSD: valz_acpi.c,v 1.3 2010/04/15 07:02:24 jruoho Exp $ */ 2 3 /* 4 * Copyright (c) 2010 Jonathan A. Kollasch 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 COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 20 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 26 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: valz_acpi.c,v 1.3 2010/04/15 07:02:24 jruoho Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/syslog.h> 35 36 #include <dev/acpi/acpireg.h> 37 #include <dev/acpi/acpivar.h> 38 39 struct valz_softc { 40 device_t sc_dev; 41 ACPI_HANDLE sc_lcd; 42 }; 43 44 enum valz_action { 45 VALZ_BACKLIGHT_NOCHANGE, 46 VALZ_BACKLIGHT_DECREASE, 47 VALZ_BACKLIGHT_INCREASE, 48 }; 49 50 static const char * const valz_hids[] = { 51 "TOS1900", 52 NULL 53 }; 54 55 static int valz_match(device_t, cfdata_t, void *); 56 static void valz_attach(device_t, device_t, void *); 57 static ACPI_STATUS valz_check_bcl(ACPI_HANDLE, uint32_t, void*, void **); 58 static void valz_locate_lcd(struct valz_softc *); 59 static void valz_lcd_notify_handler(ACPI_HANDLE, uint32_t, void *); 60 static void valz_adjust_backlight(struct valz_softc *, enum valz_action); 61 static void valz_pmf_brightness_decrease(device_t); 62 static void valz_pmf_brightness_increase(device_t); 63 64 CFATTACH_DECL_NEW(valz, sizeof(struct valz_softc), 65 valz_match, valz_attach, NULL, NULL); 66 67 static int 68 valz_match(device_t parent, cfdata_t match, void *aux) 69 { 70 struct acpi_attach_args *aa = aux; 71 72 if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) 73 return 0; 74 75 return acpi_match_hid(aa->aa_node->ad_devinfo, valz_hids); 76 } 77 78 static void 79 valz_attach(device_t parent, device_t self, void *aux) 80 { 81 struct valz_softc *sc; 82 ACPI_STATUS rv; 83 84 aprint_naive("\n"); 85 aprint_normal("\n"); 86 87 sc = device_private(self); 88 sc->sc_dev = self; 89 sc->sc_lcd = NULL; 90 91 valz_locate_lcd(sc); 92 93 if (sc->sc_lcd == NULL) { 94 aprint_error_dev(self, "failed to find a usable LCD\n"); 95 return; 96 } 97 98 if(!pmf_event_register(self, PMFE_DISPLAY_BRIGHTNESS_DOWN, 99 valz_pmf_brightness_decrease, false)) 100 aprint_error_dev(self, "failed to register event handler\n"); 101 102 if(!pmf_event_register(self, PMFE_DISPLAY_BRIGHTNESS_UP, 103 valz_pmf_brightness_increase, false)) 104 aprint_error_dev(self, "failed to register event handler\n"); 105 106 /* 107 * XXX: This is broken. 108 * 109 * It claims resources that do not belong to it. 110 * 111 * It either prevents an ACPI video driver for 112 * receiving events or duplicates the notifications. 113 */ 114 rv = AcpiInstallNotifyHandler(sc->sc_lcd, ACPI_DEVICE_NOTIFY, 115 valz_lcd_notify_handler, sc); 116 if (ACPI_FAILURE(rv)) 117 aprint_error_dev(self, "failed to install notify handler; %s\n", 118 AcpiFormatException(rv)); 119 } 120 121 static void 122 valz_lcd_notify_handler(ACPI_HANDLE handle, uint32_t notify, void *context) 123 { 124 struct valz_softc *sc = context; 125 126 /* XXX magic */ 127 switch (notify) { 128 case 0x86: 129 pmf_event_inject(sc->sc_dev, PMFE_DISPLAY_BRIGHTNESS_UP); 130 break; 131 case 0x87: 132 pmf_event_inject(sc->sc_dev, PMFE_DISPLAY_BRIGHTNESS_DOWN); 133 break; 134 default: 135 log(LOG_INFO, "%s: unknown notify: 0x%x\n", 136 device_xname(sc->sc_dev), notify); 137 break; 138 } 139 } 140 141 static void 142 valz_locate_lcd(struct valz_softc *sc) 143 { 144 ACPI_HANDLE parent; 145 ACPI_STATUS rv; 146 147 rv = AcpiGetHandle(ACPI_ROOT_OBJECT, "\\_SB_", &parent); 148 if (ACPI_FAILURE(rv)) 149 return; 150 151 AcpiWalkNamespace(ACPI_TYPE_DEVICE, parent, 100, 152 valz_check_bcl, NULL, sc, NULL); 153 } 154 155 static ACPI_STATUS 156 valz_check_bcl(ACPI_HANDLE handle, uint32_t level, 157 void *context, void **status) 158 { 159 struct valz_softc *sc = context; 160 ACPI_STATUS rv; 161 ACPI_BUFFER buf; 162 163 rv = acpi_eval_struct(handle, "_BCL", &buf); 164 if (ACPI_FAILURE(rv)) 165 return AE_OK; 166 167 sc->sc_lcd = handle; 168 169 if (buf.Pointer) 170 AcpiOsFree(buf.Pointer); 171 172 return AE_OK; 173 } 174 175 static void 176 valz_adjust_backlight(struct valz_softc *sc, enum valz_action action) 177 { 178 ACPI_STATUS rv; 179 ACPI_INTEGER old_level, new_level; 180 181 if (sc->sc_lcd == NULL) 182 return; 183 184 /* Get current backlight level. */ 185 rv = acpi_eval_integer(sc->sc_lcd, "_BQC", &old_level); 186 if (ACPI_FAILURE(rv)) { 187 log(LOG_CRIT, "%s: _BQC failed evaluation: %s\n", 188 device_xname(sc->sc_dev), AcpiFormatException(rv)); 189 return; 190 } 191 192 new_level = old_level; 193 194 switch (action) { 195 case VALZ_BACKLIGHT_DECREASE: 196 if(old_level >= 10) 197 new_level -= 10; 198 break; 199 case VALZ_BACKLIGHT_INCREASE: 200 if(old_level <= 60) 201 new_level += 10; 202 break; 203 default: 204 return; 205 } 206 207 if (new_level == old_level) 208 return; 209 210 rv = acpi_eval_set_integer(sc->sc_lcd, "_BCM", new_level); 211 if (ACPI_FAILURE(rv)) 212 log(LOG_CRIT, "%s: _BCM failed evaluation: %s\n", 213 device_xname(sc->sc_dev), AcpiFormatException(rv)); 214 } 215 216 static void 217 valz_pmf_brightness_decrease(device_t self) 218 { 219 struct valz_softc *sc; 220 sc = device_private(self); 221 valz_adjust_backlight(sc, VALZ_BACKLIGHT_DECREASE); 222 } 223 224 static void 225 valz_pmf_brightness_increase(device_t self) 226 { 227 struct valz_softc *sc; 228 sc = device_private(self); 229 valz_adjust_backlight(sc, VALZ_BACKLIGHT_INCREASE); 230 } 231