1/* $NetBSD: lcdctl.c,v 1.2 2012/01/27 14:48:22 tsutsui Exp $ */ 2 3/*- 4 * Copyright (C) 2012 NONAKA Kimihiro <nonaka@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 47struct lcdctl_backlight { 48 int duty; /* LZ9JG18 DAC value */ 49 int cont; /* BACKLIGHT_CONT signal */ 50 int on; /* BACKLIGHT_ON signal */ 51}; 52 53struct 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 */ 66static 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 76static int lcdctl_match(device_t, cfdata_t, void *); 77static void lcdctl_attach(device_t, device_t, void *); 78 79CFATTACH_DECL_NEW(lcdctl, sizeof(struct lcdctl_softc), 80 lcdctl_match, lcdctl_attach, NULL, NULL); 81 82static void lcdctl_brightness_up(device_t); 83static void lcdctl_brightness_down(device_t); 84static void lcdctl_display_on(device_t); 85static void lcdctl_display_off(device_t); 86 87static void lcdctl_set_brightness(struct lcdctl_softc *, int); 88static void lcdctl_set_blank(struct lcdctl_softc *, bool); 89static void lcdctl_set_backlight(struct lcdctl_softc *, bool); 90 91static struct lcdctl_softc *lcdctl_sc; 92 93static int 94lcdctl_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 104static void 105lcdctl_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 if (ZAURUS_ISC1000 || ZAURUS_ISC3000) { 119 sc->sc_nbacklighttbl = __arraycount(lcdctl_backlight_c3000); 120 sc->sc_backlighttbl = lcdctl_backlight_c3000; 121 } else { 122 /* XXX: Is this okay for C7x0/860? */ 123 sc->sc_nbacklighttbl = __arraycount(lcdctl_backlight_c3000); 124 sc->sc_backlighttbl = lcdctl_backlight_c3000; 125 } 126 127 /* Start with approximately 40% of full brightness. */ 128 lcdctl_set_brightness(sc, 3); 129 130 lcdctl_sc = sc; 131 132 if (!pmf_event_register(self, PMFE_DISPLAY_BRIGHTNESS_UP, 133 lcdctl_brightness_up, true)) 134 aprint_error_dev(self, "couldn't register event handler\n"); 135 if (!pmf_event_register(self, PMFE_DISPLAY_BRIGHTNESS_DOWN, 136 lcdctl_brightness_down, true)) 137 aprint_error_dev(self, "couldn't register event handler\n"); 138 if (!pmf_event_register(self, PMFE_DISPLAY_ON, 139 lcdctl_display_on, true)) 140 aprint_error_dev(self, "couldn't register event handler\n"); 141 if (!pmf_event_register(self, PMFE_DISPLAY_OFF, 142 lcdctl_display_off, true)) 143 aprint_error_dev(self, "couldn't register event handler\n"); 144} 145 146static void 147lcdctl_brightness_up(device_t dv) 148{ 149 struct lcdctl_softc *sc = device_private(dv); 150 151 lcdctl_set_brightness(sc, sc->sc_brightness + 1); 152} 153 154static void 155lcdctl_brightness_down(device_t dv) 156{ 157 struct lcdctl_softc *sc = device_private(dv); 158 159 lcdctl_set_brightness(sc, sc->sc_brightness - 1); 160} 161 162static void 163lcdctl_display_on(device_t dv) 164{ 165 struct lcdctl_softc *sc = device_private(dv); 166 167 lcdctl_set_blank(sc, false); 168 lcdctl_set_backlight(sc, true); 169} 170 171static void 172lcdctl_display_off(device_t dv) 173{ 174 struct lcdctl_softc *sc = device_private(dv); 175 176 lcdctl_set_backlight(sc, false); 177 lcdctl_set_blank(sc, true); 178} 179 180static __inline void 181set_backlight(const struct lcdctl_backlight *bl) 182{ 183 184 (void) zssp_ic_send(ZSSP_IC_LZ9JG18, bl->duty); 185 if (ZAURUS_ISC1000) 186 ioexp_set_backlight(bl->on, bl->cont); 187 else 188 scoop_set_backlight(bl->on, bl->cont); 189} 190 191static void 192lcdctl_set_brightness_internal(struct lcdctl_softc *sc, int newval) 193{ 194 int i; 195 196 /* 197 * It appears that the C3000 backlight can draw too much power if we 198 * switch it from a low to a high brightness. Increasing brightness 199 * in steps avoids this issue. 200 */ 201 if (newval > sc->sc_brightnesscurval) { 202 for (i = sc->sc_brightnesscurval + 1; i <= newval; i++) { 203 set_backlight(&sc->sc_backlighttbl[i]); 204 delay(5000); 205 } 206 } else 207 set_backlight(&sc->sc_backlighttbl[newval]); 208 209 sc->sc_brightnesscurval = newval; 210} 211 212static void 213lcdctl_set_brightness(struct lcdctl_softc *sc, int newval) 214{ 215 int maxval = sc->sc_nbacklighttbl - 1; 216 217 if (newval < 0) 218 newval = 0; 219 else if (newval > maxval) 220 newval = maxval; 221 222 if (sc->sc_islit && !sc->sc_isblank) 223 lcdctl_set_brightness_internal(sc, newval); 224 225 if (newval > 0) 226 sc->sc_brightness = newval; 227} 228 229static void 230lcdctl_set_backlight(struct lcdctl_softc *sc, bool onoff) 231{ 232 233 if (!onoff) { 234 lcdctl_set_brightness(sc, 0); 235 sc->sc_islit = false; 236 } else { 237 sc->sc_islit = true; 238 lcdctl_set_brightness(sc, sc->sc_brightness); 239 } 240} 241 242static void 243lcdctl_set_blank(struct lcdctl_softc *sc, bool isblank) 244{ 245 246 if (isblank) { 247 lcdctl_set_brightness(sc, 0); 248 sc->sc_isblank = true; 249 } else { 250 sc->sc_isblank = false; 251 lcdctl_set_brightness(sc, sc->sc_brightness); 252 } 253} 254 255static void 256lcdctl_set_onoff(struct lcdctl_softc *sc, bool onoff) 257{ 258 259 if (!onoff) { 260 lcdctl_set_brightness(sc, 0); 261 } else { 262 lcdctl_set_brightness(sc, sc->sc_brightness); 263 } 264} 265 266static int 267lcdctl_param_ioctl(struct lcdctl_softc *sc, u_long cmd, struct wsdisplay_param *dp) 268{ 269 int rv = EINVAL; 270 271 switch (dp->param) { 272 case WSDISPLAYIO_PARAM_BACKLIGHT: 273 if (cmd == WSDISPLAYIO_GETPARAM) { 274 dp->min = 0; 275 dp->max = 1; 276 dp->curval = sc->sc_islit ? 1 : 0; 277 rv = 0; 278 } else if (cmd == WSDISPLAYIO_SETPARAM) { 279 lcdctl_set_backlight(sc, dp->curval != 0); 280 rv = 0; 281 } 282 break; 283 284 case WSDISPLAYIO_PARAM_CONTRAST: 285 /* unsupported */ 286 rv = ENOTTY; 287 break; 288 289 case WSDISPLAYIO_PARAM_BRIGHTNESS: 290 if (cmd == WSDISPLAYIO_GETPARAM) { 291 dp->min = 1; 292 dp->max = sc->sc_nbacklighttbl - 1; 293 dp->curval = sc->sc_brightness; 294 rv = 0; 295 } else if (cmd == WSDISPLAYIO_SETPARAM) { 296 lcdctl_set_brightness(sc, dp->curval); 297 rv = 0; 298 } 299 break; 300 } 301 return rv; 302} 303 304void 305lcdctl_brightness(int newval) 306{ 307 308 if (__predict_true(lcdctl_sc != NULL)) 309 lcdctl_set_brightness(lcdctl_sc, newval); 310} 311 312void 313lcdctl_blank(bool isblank) 314{ 315 316 if (__predict_true(lcdctl_sc != NULL)) 317 lcdctl_set_blank(lcdctl_sc, isblank); 318} 319 320void 321lcdctl_onoff(bool onoff) 322{ 323 324 if (__predict_true(lcdctl_sc != NULL)) 325 lcdctl_set_onoff(lcdctl_sc, onoff); 326} 327 328int 329lcdctl_param(u_long cmd, struct wsdisplay_param *dp) 330{ 331 332 if (__predict_true(lcdctl_sc != NULL)) 333 return lcdctl_param_ioctl(lcdctl_sc, cmd, dp); 334 return ENOTTY; /* unsupported */ 335} 336