lcdctl.c revision 1.2
1 /* $NetBSD: lcdctl.c,v 1.2 2012/01/27 14:48:22 tsutsui Exp $ */ 2 3 /*- 4 * Copyright (C) 2012 NONAKA Kimihiro <nonaka (at) netbsd.org> 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, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: lcdctl.c,v 1.2 2012/01/27 14:48:22 tsutsui Exp $"); 30 31 #include "ioexp.h" 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/device.h> 36 #include <sys/bus.h> 37 38 #include <dev/wscons/wsconsio.h> 39 #include <dev/wscons/wsdisplayvar.h> 40 41 #include <zaurus/zaurus/zaurus_var.h> 42 #include <zaurus/dev/lcdctlvar.h> 43 #include <zaurus/dev/zsspvar.h> 44 #include <zaurus/dev/scoopvar.h> 45 #include <zaurus/dev/ioexpvar.h> 46 47 struct lcdctl_backlight { 48 int duty; /* LZ9JG18 DAC value */ 49 int cont; /* BACKLIGHT_CONT signal */ 50 int on; /* BACKLIGHT_ON signal */ 51 }; 52 53 struct lcdctl_softc { 54 device_t sc_dev; 55 56 int sc_brightness; 57 int sc_brightnesscurval; 58 bool sc_islit; 59 bool sc_isblank; 60 61 int sc_nbacklighttbl; 62 const struct lcdctl_backlight *sc_backlighttbl; 63 }; 64 65 /* for SL-C1000/SL-C3x00 */ 66 static const struct lcdctl_backlight lcdctl_backlight_c3000[] = { 67 { 0x00, 0, 0 }, /* 0: Off */ 68 { 0x00, 0, 1 }, /* 1: 0% */ 69 { 0x01, 0, 1 }, /* 2: 20% */ 70 { 0x07, 0, 1 }, /* 3: 40% */ 71 { 0x01, 1, 1 }, /* 4: 60% */ 72 { 0x07, 1, 1 }, /* 5: 80% */ 73 { 0x11, 1, 1 } /* 6: 100% */ 74 }; 75 76 static int lcdctl_match(device_t, cfdata_t, void *); 77 static void lcdctl_attach(device_t, device_t, void *); 78 79 CFATTACH_DECL_NEW(lcdctl, sizeof(struct lcdctl_softc), 80 lcdctl_match, lcdctl_attach, NULL, NULL); 81 82 static void lcdctl_brightness_up(device_t); 83 static void lcdctl_brightness_down(device_t); 84 static void lcdctl_display_on(device_t); 85 static void lcdctl_display_off(device_t); 86 87 static void lcdctl_set_brightness(struct lcdctl_softc *, int); 88 static void lcdctl_set_blank(struct lcdctl_softc *, bool); 89 static void lcdctl_set_backlight(struct lcdctl_softc *, bool); 90 91 static struct lcdctl_softc *lcdctl_sc; 92 93 static int 94 lcdctl_match(device_t parent, cfdata_t cf, void *aux) 95 { 96 struct zssp_attach_args *aa = aux; 97 98 if (strcmp("lcdctl", aa->zaa_name)) 99 return 0; 100 101 return 1; 102 } 103 104 static void 105 lcdctl_attach(device_t parent, device_t self, void *aux) 106 { 107 struct lcdctl_softc *sc = device_private(self); 108 109 sc->sc_dev = self; 110 111 aprint_normal("\n"); 112 aprint_naive("\n"); 113 114 sc->sc_brightness = sc->sc_brightnesscurval = 1; 115 sc->sc_islit = true; 116 sc->sc_isblank = false; 117 118 sc->sc_nbacklighttbl = __arraycount(lcdctl_backlight_c3000); 119 sc->sc_backlighttbl = lcdctl_backlight_c3000; 120 121 /* Start with approximately 40% of full brightness. */ 122 lcdctl_set_brightness(sc, 3); 123 124 lcdctl_sc = sc; 125 126 if (!pmf_event_register(self, PMFE_DISPLAY_BRIGHTNESS_UP, 127 lcdctl_brightness_up, true)) 128 aprint_error_dev(self, "couldn't register event handler\n"); 129 if (!pmf_event_register(self, PMFE_DISPLAY_BRIGHTNESS_DOWN, 130 lcdctl_brightness_down, true)) 131 aprint_error_dev(self, "couldn't register event handler\n"); 132 if (!pmf_event_register(self, PMFE_DISPLAY_ON, 133 lcdctl_display_on, true)) 134 aprint_error_dev(self, "couldn't register event handler\n"); 135 if (!pmf_event_register(self, PMFE_DISPLAY_OFF, 136 lcdctl_display_off, true)) 137 aprint_error_dev(self, "couldn't register event handler\n"); 138 } 139 140 static void 141 lcdctl_brightness_up(device_t dv) 142 { 143 struct lcdctl_softc *sc = device_private(dv); 144 145 lcdctl_set_brightness(sc, sc->sc_brightness + 1); 146 } 147 148 static void 149 lcdctl_brightness_down(device_t dv) 150 { 151 struct lcdctl_softc *sc = device_private(dv); 152 153 lcdctl_set_brightness(sc, sc->sc_brightness - 1); 154 } 155 156 static void 157 lcdctl_display_on(device_t dv) 158 { 159 struct lcdctl_softc *sc = device_private(dv); 160 161 lcdctl_set_blank(sc, false); 162 lcdctl_set_backlight(sc, true); 163 } 164 165 static void 166 lcdctl_display_off(device_t dv) 167 { 168 struct lcdctl_softc *sc = device_private(dv); 169 170 lcdctl_set_backlight(sc, false); 171 lcdctl_set_blank(sc, true); 172 } 173 174 static __inline void 175 set_backlight(const struct lcdctl_backlight *bl) 176 { 177 178 (void) zssp_ic_send(ZSSP_IC_LZ9JG18, bl->duty); 179 if (ZAURUS_ISC1000) 180 ioexp_set_backlight(bl->on, bl->cont); 181 else 182 scoop_set_backlight(bl->on, bl->cont); 183 } 184 185 static void 186 lcdctl_set_brightness_internal(struct lcdctl_softc *sc, int newval) 187 { 188 int i; 189 190 /* 191 * It appears that the C3000 backlight can draw too much power if we 192 * switch it from a low to a high brightness. Increasing brightness 193 * in steps avoids this issue. 194 */ 195 if (newval > sc->sc_brightnesscurval) { 196 for (i = sc->sc_brightnesscurval + 1; i <= newval; i++) { 197 set_backlight(&sc->sc_backlighttbl[i]); 198 delay(5000); 199 } 200 } else 201 set_backlight(&sc->sc_backlighttbl[newval]); 202 203 sc->sc_brightnesscurval = newval; 204 } 205 206 static void 207 lcdctl_set_brightness(struct lcdctl_softc *sc, int newval) 208 { 209 int maxval = sc->sc_nbacklighttbl - 1; 210 211 if (newval < 0) 212 newval = 0; 213 else if (newval > maxval) 214 newval = maxval; 215 216 if (sc->sc_islit && !sc->sc_isblank) 217 lcdctl_set_brightness_internal(sc, newval); 218 219 if (newval > 0) 220 sc->sc_brightness = newval; 221 } 222 223 static void 224 lcdctl_set_backlight(struct lcdctl_softc *sc, bool onoff) 225 { 226 227 if (!onoff) { 228 lcdctl_set_brightness(sc, 0); 229 sc->sc_islit = false; 230 } else { 231 sc->sc_islit = true; 232 lcdctl_set_brightness(sc, sc->sc_brightness); 233 } 234 } 235 236 static void 237 lcdctl_set_blank(struct lcdctl_softc *sc, bool isblank) 238 { 239 240 if (isblank) { 241 lcdctl_set_brightness(sc, 0); 242 sc->sc_isblank = true; 243 } else { 244 sc->sc_isblank = false; 245 lcdctl_set_brightness(sc, sc->sc_brightness); 246 } 247 } 248 249 static void 250 lcdctl_set_onoff(struct lcdctl_softc *sc, bool onoff) 251 { 252 253 if (!onoff) { 254 lcdctl_set_brightness(sc, 0); 255 } else { 256 lcdctl_set_brightness(sc, sc->sc_brightness); 257 } 258 } 259 260 static int 261 lcdctl_param_ioctl(struct lcdctl_softc *sc, u_long cmd, struct wsdisplay_param *dp) 262 { 263 int rv = EINVAL; 264 265 switch (dp->param) { 266 case WSDISPLAYIO_PARAM_BACKLIGHT: 267 if (cmd == WSDISPLAYIO_GETPARAM) { 268 dp->min = 0; 269 dp->max = 1; 270 dp->curval = sc->sc_islit ? 1 : 0; 271 rv = 0; 272 } else if (cmd == WSDISPLAYIO_SETPARAM) { 273 lcdctl_set_backlight(sc, dp->curval != 0); 274 rv = 0; 275 } 276 break; 277 278 case WSDISPLAYIO_PARAM_CONTRAST: 279 /* unsupported */ 280 rv = ENOTTY; 281 break; 282 283 case WSDISPLAYIO_PARAM_BRIGHTNESS: 284 if (cmd == WSDISPLAYIO_GETPARAM) { 285 dp->min = 1; 286 dp->max = sc->sc_nbacklighttbl - 1; 287 dp->curval = sc->sc_brightness; 288 rv = 0; 289 } else if (cmd == WSDISPLAYIO_SETPARAM) { 290 lcdctl_set_brightness(sc, dp->curval); 291 rv = 0; 292 } 293 break; 294 } 295 return rv; 296 } 297 298 void 299 lcdctl_brightness(int newval) 300 { 301 302 if (__predict_true(lcdctl_sc != NULL)) 303 lcdctl_set_brightness(lcdctl_sc, newval); 304 } 305 306 void 307 lcdctl_blank(bool isblank) 308 { 309 310 if (__predict_true(lcdctl_sc != NULL)) 311 lcdctl_set_blank(lcdctl_sc, isblank); 312 } 313 314 void 315 lcdctl_onoff(bool onoff) 316 { 317 318 if (__predict_true(lcdctl_sc != NULL)) 319 lcdctl_set_onoff(lcdctl_sc, onoff); 320 } 321 322 int 323 lcdctl_param(u_long cmd, struct wsdisplay_param *dp) 324 { 325 326 if (__predict_true(lcdctl_sc != NULL)) 327 return lcdctl_param_ioctl(lcdctl_sc, cmd, dp); 328 return ENOTTY; /* unsupported */ 329 } 330
Indexes created Mon Sep 22 05:09:51 GMT 2025