lmu.c revision 1.9.6.1
1 /* $NetBSD: lmu.c,v 1.9.6.1 2021/08/09 00:30:08 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2020 Michael Lorenz 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 NETBSD FOUNDATION, INC. 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 FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * ambient light controller found in PowerBook5,6 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: lmu.c,v 1.9.6.1 2021/08/09 00:30:08 thorpej Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/device.h> 39 #include <sys/conf.h> 40 #include <sys/bus.h> 41 #include <sys/time.h> 42 #include <sys/callout.h> 43 #include <sys/sysctl.h> 44 45 #include <dev/i2c/i2cvar.h> 46 47 #include <dev/sysmon/sysmonvar.h> 48 #include "opt_lmu.h" 49 50 #ifdef LMU_DEBUG 51 #define DPRINTF printf 52 #else 53 #define DPRINTF if (0) printf 54 #endif 55 56 struct lmu_softc { 57 device_t sc_dev; 58 i2c_tag_t sc_i2c; 59 i2c_addr_t sc_addr; 60 61 struct sysmon_envsys *sc_sme; 62 envsys_data_t sc_sensors[2]; 63 callout_t sc_adjust; 64 int sc_thresh, sc_hyst, sc_level, sc_target, sc_current; 65 int sc_lux[2]; 66 time_t sc_last; 67 int sc_lid_state, sc_video_state; 68 }; 69 70 static int lmu_match(device_t, cfdata_t, void *); 71 static void lmu_attach(device_t, device_t, void *); 72 73 static void lmu_sensors_refresh(struct sysmon_envsys *, envsys_data_t *); 74 static void lmu_set_brightness(struct lmu_softc *, int); 75 static int lmu_get_brightness(struct lmu_softc *, int); 76 static void lmu_adjust(void *); 77 static int lmu_sysctl(SYSCTLFN_ARGS); 78 static int lmu_sysctl_thresh(SYSCTLFN_ARGS); 79 80 CFATTACH_DECL_NEW(lmu, sizeof(struct lmu_softc), 81 lmu_match, lmu_attach, NULL, NULL); 82 83 static const struct device_compatible_entry compat_data[] = { 84 { .compat = "lmu-micro" }, 85 { .compat = "lmu-controller" }, 86 DEVICE_COMPAT_EOL 87 }; 88 89 /* time between polling the light sensors */ 90 #define LMU_POLL (hz * 2) 91 /* time between updates to keyboard brightness */ 92 #define LMU_FADE (hz / 16) 93 94 static void 95 lmu_lid_open(device_t dev) 96 { 97 struct lmu_softc * const sc = device_private(dev); 98 99 sc->sc_lid_state = true; 100 } 101 102 static void 103 lmu_lid_close(device_t dev) 104 { 105 struct lmu_softc * const sc = device_private(dev); 106 107 sc->sc_lid_state = false; 108 } 109 110 static void 111 lmu_video_on(device_t dev) 112 { 113 struct lmu_softc * const sc = device_private(dev); 114 115 sc->sc_video_state = true; 116 } 117 118 static void 119 lmu_video_off(device_t dev) 120 { 121 struct lmu_softc * const sc = device_private(dev); 122 123 sc->sc_video_state = false; 124 } 125 126 static void 127 lmu_kbd_brightness_up(device_t dev) 128 { 129 struct lmu_softc * const sc = device_private(dev); 130 131 sc->sc_level = __MIN(16, sc->sc_level + 2); 132 sc->sc_target = sc->sc_level; 133 callout_schedule(&sc->sc_adjust, LMU_FADE); 134 } 135 136 static void 137 lmu_kbd_brightness_down(device_t dev) 138 { 139 struct lmu_softc * const sc = device_private(dev); 140 141 sc->sc_level = __MAX(0, sc->sc_level - 2); 142 sc->sc_target = sc->sc_level; 143 callout_schedule(&sc->sc_adjust, LMU_FADE); 144 } 145 146 static int 147 lmu_match(device_t parent, cfdata_t match, void *aux) 148 { 149 struct i2c_attach_args *ia = aux; 150 int match_result; 151 152 if (iic_use_direct_match(ia, match, compat_data, &match_result)) 153 return match_result; 154 155 return 0; 156 } 157 158 static void 159 lmu_attach(device_t parent, device_t self, void *aux) 160 { 161 struct lmu_softc *sc = device_private(self); 162 struct i2c_attach_args *ia = aux; 163 envsys_data_t *s; 164 const struct sysctlnode *me; 165 166 sc->sc_dev = self; 167 sc->sc_i2c = ia->ia_tag; 168 sc->sc_addr = ia->ia_addr; 169 sc->sc_last = 0; 170 171 aprint_naive("\n"); 172 aprint_normal(": ambient light sensor\n"); 173 174 sc->sc_lid_state = true; 175 pmf_event_register(sc->sc_dev, PMFE_CHASSIS_LID_OPEN, 176 lmu_lid_open, true); 177 pmf_event_register(sc->sc_dev, PMFE_CHASSIS_LID_CLOSE, 178 lmu_lid_close, true); 179 sc->sc_video_state = true; 180 pmf_event_register(sc->sc_dev, PMFE_DISPLAY_ON, 181 lmu_video_on, true); 182 pmf_event_register(sc->sc_dev, PMFE_DISPLAY_OFF, 183 lmu_video_off, true); 184 pmf_event_register(sc->sc_dev, PMFE_KEYBOARD_BRIGHTNESS_UP, 185 lmu_kbd_brightness_up, true); 186 pmf_event_register(sc->sc_dev, PMFE_KEYBOARD_BRIGHTNESS_DOWN, 187 lmu_kbd_brightness_down, true); 188 189 sc->sc_sme = sysmon_envsys_create(); 190 sc->sc_sme->sme_name = device_xname(self); 191 sc->sc_sme->sme_cookie = sc; 192 sc->sc_sme->sme_refresh = lmu_sensors_refresh; 193 194 s = &sc->sc_sensors[0]; 195 s->state = ENVSYS_SINVALID; 196 s->units = ENVSYS_LUX; 197 strcpy(s->desc, "right"); 198 s->private = 0; 199 sysmon_envsys_sensor_attach(sc->sc_sme, s); 200 201 s = &sc->sc_sensors[1]; 202 s->state = ENVSYS_SINVALID; 203 s->units = ENVSYS_LUX; 204 strcpy(s->desc, "left"); 205 s->private = 1; 206 sysmon_envsys_sensor_attach(sc->sc_sme, s); 207 208 sysmon_envsys_register(sc->sc_sme); 209 210 sc->sc_thresh = 300; 211 sc->sc_hyst = 30; 212 sc->sc_level = 16; 213 sc->sc_target = 0; 214 sc->sc_current = 0; 215 216 sysctl_createv(NULL, 0, NULL, &me, 217 CTLFLAG_READWRITE, 218 CTLTYPE_NODE, "lmu", 219 SYSCTL_DESCR("LMU driver"), 220 NULL, 0, NULL, 0, 221 CTL_HW, CTL_CREATE, CTL_EOL); 222 223 sysctl_createv(NULL, 0, NULL, NULL, 224 CTLFLAG_READWRITE, 225 CTLTYPE_INT, "level", 226 SYSCTL_DESCR("keyboard brightness"), 227 lmu_sysctl, 0, (void *)sc, 0, 228 CTL_HW, me->sysctl_num, CTL_CREATE, CTL_EOL); 229 230 sysctl_createv(NULL, 0, NULL, NULL, 231 CTLFLAG_READWRITE, 232 CTLTYPE_INT, "threshold", 233 SYSCTL_DESCR("environmental light threshold"), 234 lmu_sysctl_thresh, 1, (void *)sc, 0, 235 CTL_HW, me->sysctl_num, CTL_CREATE, CTL_EOL); 236 237 callout_init(&sc->sc_adjust, 0); 238 callout_setfunc(&sc->sc_adjust, lmu_adjust, sc); 239 callout_schedule(&sc->sc_adjust, 0); 240 } 241 242 static void 243 lmu_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 244 { 245 struct lmu_softc *sc = sme->sme_cookie; 246 int ret; 247 248 if ( edata->private < 3) { 249 ret = lmu_get_brightness(sc, edata->private); 250 if (ret == -1) return; 251 edata->value_cur = ret; 252 } 253 edata->state = ENVSYS_SVALID; 254 } 255 256 static int 257 lmu_get_brightness(struct lmu_softc *sc, int reg) 258 { 259 int error, i; 260 uint16_t buf[2]; 261 uint8_t cmd = 0; 262 263 if (reg > 1) return -1; 264 if (time_second == sc->sc_last) 265 return sc->sc_lux[reg]; 266 267 iic_acquire_bus(sc->sc_i2c, 0); 268 error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, 269 sc->sc_addr, &cmd, 1, buf, 4, 0); 270 iic_release_bus(sc->sc_i2c, 0); 271 if (error) return -1; 272 sc->sc_last = time_second; 273 274 for (i = 0; i < 2; i++) 275 sc->sc_lux[i] = be16toh(buf[i]); 276 277 DPRINTF("<%d %04x %04x>", reg, buf[0], buf[1]); 278 279 return (sc->sc_lux[reg]); 280 } 281 282 static void 283 lmu_set_brightness(struct lmu_softc *sc, int b) 284 { 285 uint8_t cmd[3]; 286 287 cmd[0] = 1; 288 289 cmd[1] = (b & 0xff); 290 cmd[2] = (b & 0xff) >> 8; 291 292 iic_acquire_bus(sc->sc_i2c, 0); 293 iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, 294 sc->sc_addr, &cmd, 3, NULL, 0, 0); 295 iic_release_bus(sc->sc_i2c, 0); 296 } 297 298 static void 299 lmu_adjust(void *cookie) 300 { 301 struct lmu_softc *sc = cookie; 302 int left, right, b, offset; 303 304 left = lmu_get_brightness(sc, 1); 305 right = lmu_get_brightness(sc, 0); 306 b = left > right ? left : right; 307 308 if ((b > (sc->sc_thresh + sc->sc_hyst)) || 309 !(sc->sc_lid_state && sc->sc_video_state)) { 310 sc->sc_target = 0; 311 } else if (b < sc->sc_thresh) { 312 sc->sc_target = sc->sc_level; 313 } 314 315 if (sc->sc_target == sc->sc_current) { 316 /* no update needed, check again later */ 317 callout_schedule(&sc->sc_adjust, LMU_POLL); 318 return; 319 } 320 321 322 offset = ((sc->sc_target - sc->sc_current) > 0) ? 2 : -2; 323 sc->sc_current += offset; 324 if (sc->sc_current > sc->sc_level) sc->sc_current = sc->sc_level; 325 if (sc->sc_current < 0) sc->sc_current = 0; 326 327 DPRINTF("[%d]", sc->sc_current); 328 329 lmu_set_brightness(sc, sc->sc_current); 330 331 if (sc->sc_target == sc->sc_current) { 332 /* no update needed, check again later */ 333 callout_schedule(&sc->sc_adjust, LMU_POLL); 334 return; 335 } 336 337 /* more updates upcoming */ 338 callout_schedule(&sc->sc_adjust, LMU_FADE); 339 } 340 341 static int 342 lmu_sysctl(SYSCTLFN_ARGS) 343 { 344 struct sysctlnode node = *rnode; 345 struct lmu_softc *sc = node.sysctl_data; 346 int target; 347 348 target = sc->sc_level; 349 node.sysctl_data = ⌖ 350 if (sysctl_lookup(SYSCTLFN_CALL(&node)) == 0) { 351 int new_reg; 352 353 new_reg = *(int *)node.sysctl_data; 354 if (new_reg != sc->sc_target) { 355 sc->sc_level = target; 356 sc->sc_target = target; 357 358 } 359 return 0; 360 } 361 return EINVAL; 362 } 363 364 static int 365 lmu_sysctl_thresh(SYSCTLFN_ARGS) 366 { 367 struct sysctlnode node = *rnode; 368 struct lmu_softc *sc = node.sysctl_data; 369 int thresh; 370 371 thresh = sc->sc_thresh; 372 node.sysctl_data = &thresh; 373 if (sysctl_lookup(SYSCTLFN_CALL(&node)) == 0) { 374 int new_reg; 375 376 new_reg = *(int *)node.sysctl_data; 377 if (new_reg != sc->sc_thresh && new_reg > 0) { 378 sc->sc_thresh = new_reg; 379 } 380 return 0; 381 } 382 return EINVAL; 383 } 384
Indexes created Fri Oct 17 09:09:57 GMT 2025