lmu.c revision 1.11
1 /* $NetBSD: lmu.c,v 1.11 2025/09/17 14:15:16 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 1.11 2025/09/17 14:15:16 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/kthread.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 lwp_t *sc_adjust; 64 kcondvar_t sc_event; 65 kmutex_t sc_evmtx; 66 int sc_thresh, sc_hyst, sc_level, sc_target, sc_current; 67 int sc_lux[2]; 68 time_t sc_last; 69 int sc_lid_state, sc_video_state; 70 }; 71 72 static int lmu_match(device_t, cfdata_t, void *); 73 static void lmu_attach(device_t, device_t, void *); 74 75 static void lmu_sensors_refresh(struct sysmon_envsys *, envsys_data_t *); 76 static void lmu_set_brightness(struct lmu_softc *, int); 77 static int lmu_get_brightness(struct lmu_softc *, int); 78 static void lmu_adjust(void *); 79 static int lmu_sysctl(SYSCTLFN_ARGS); 80 static int lmu_sysctl_thresh(SYSCTLFN_ARGS); 81 82 CFATTACH_DECL_NEW(lmu, sizeof(struct lmu_softc), 83 lmu_match, lmu_attach, NULL, NULL); 84 85 static const struct device_compatible_entry compat_data[] = { 86 { .compat = "lmu-micro" }, 87 { .compat = "lmu-controller" }, 88 DEVICE_COMPAT_EOL 89 }; 90 91 /* time between polling the light sensors */ 92 #define LMU_POLL (hz) 93 /* time between updates to keyboard brightness */ 94 #define LMU_FADE (hz / 16) 95 96 static void 97 lmu_lid_open(device_t dev) 98 { 99 struct lmu_softc * const sc = device_private(dev); 100 101 sc->sc_lid_state = true; 102 } 103 104 static void 105 lmu_lid_close(device_t dev) 106 { 107 struct lmu_softc * const sc = device_private(dev); 108 109 sc->sc_lid_state = false; 110 } 111 112 static void 113 lmu_video_on(device_t dev) 114 { 115 struct lmu_softc * const sc = device_private(dev); 116 117 sc->sc_video_state = true; 118 } 119 120 static void 121 lmu_video_off(device_t dev) 122 { 123 struct lmu_softc * const sc = device_private(dev); 124 125 sc->sc_video_state = false; 126 } 127 128 static void 129 lmu_kbd_brightness_up(device_t dev) 130 { 131 struct lmu_softc * const sc = device_private(dev); 132 133 sc->sc_level = __MIN(16, sc->sc_level + 2); 134 sc->sc_target = sc->sc_level; 135 cv_signal(&sc->sc_event); 136 } 137 138 static void 139 lmu_kbd_brightness_down(device_t dev) 140 { 141 struct lmu_softc * const sc = device_private(dev); 142 143 sc->sc_level = __MAX(0, sc->sc_level - 2); 144 sc->sc_target = sc->sc_level; 145 cv_signal(&sc->sc_event); 146 } 147 148 static int 149 lmu_match(device_t parent, cfdata_t match, void *aux) 150 { 151 struct i2c_attach_args *ia = aux; 152 int match_result; 153 154 if (iic_use_direct_match(ia, match, compat_data, &match_result)) 155 return match_result; 156 157 return 0; 158 } 159 160 static void 161 lmu_attach(device_t parent, device_t self, void *aux) 162 { 163 struct lmu_softc *sc = device_private(self); 164 struct i2c_attach_args *ia = aux; 165 envsys_data_t *s; 166 const struct sysctlnode *me; 167 168 sc->sc_dev = self; 169 sc->sc_i2c = ia->ia_tag; 170 sc->sc_addr = ia->ia_addr; 171 sc->sc_last = 0; 172 173 aprint_naive("\n"); 174 aprint_normal(": ambient light sensor\n"); 175 176 sc->sc_lid_state = true; 177 pmf_event_register(sc->sc_dev, PMFE_CHASSIS_LID_OPEN, 178 lmu_lid_open, true); 179 pmf_event_register(sc->sc_dev, PMFE_CHASSIS_LID_CLOSE, 180 lmu_lid_close, true); 181 sc->sc_video_state = true; 182 pmf_event_register(sc->sc_dev, PMFE_DISPLAY_ON, 183 lmu_video_on, true); 184 pmf_event_register(sc->sc_dev, PMFE_DISPLAY_OFF, 185 lmu_video_off, true); 186 pmf_event_register(sc->sc_dev, PMFE_KEYBOARD_BRIGHTNESS_UP, 187 lmu_kbd_brightness_up, true); 188 pmf_event_register(sc->sc_dev, PMFE_KEYBOARD_BRIGHTNESS_DOWN, 189 lmu_kbd_brightness_down, true); 190 191 sc->sc_sme = sysmon_envsys_create(); 192 sc->sc_sme->sme_name = device_xname(self); 193 sc->sc_sme->sme_cookie = sc; 194 sc->sc_sme->sme_refresh = lmu_sensors_refresh; 195 sc->sc_sme->sme_class = 0; 196 sc->sc_sme->sme_flags = SME_INIT_REFRESH;; 197 198 199 s = &sc->sc_sensors[0]; 200 s->state = ENVSYS_SINVALID; 201 s->units = ENVSYS_LUX; 202 s->flags = ENVSYS_FHAS_ENTROPY; 203 strcpy(s->desc, "right"); 204 s->private = 0; 205 sysmon_envsys_sensor_attach(sc->sc_sme, s); 206 207 s = &sc->sc_sensors[1]; 208 s->state = ENVSYS_SINVALID; 209 s->units = ENVSYS_LUX; 210 s->flags = ENVSYS_FHAS_ENTROPY; 211 strcpy(s->desc, "left"); 212 s->private = 1; 213 sysmon_envsys_sensor_attach(sc->sc_sme, s); 214 215 sysmon_envsys_register(sc->sc_sme); 216 217 sc->sc_thresh = 300; 218 sc->sc_hyst = 30; 219 sc->sc_level = 16; 220 sc->sc_target = 0; 221 sc->sc_current = 0; 222 223 sysctl_createv(NULL, 0, NULL, &me, 224 CTLFLAG_READWRITE, 225 CTLTYPE_NODE, "lmu", 226 SYSCTL_DESCR("LMU driver"), 227 NULL, 0, NULL, 0, 228 CTL_HW, CTL_CREATE, CTL_EOL); 229 230 sysctl_createv(NULL, 0, NULL, NULL, 231 CTLFLAG_READWRITE, 232 CTLTYPE_INT, "level", 233 SYSCTL_DESCR("keyboard brightness"), 234 lmu_sysctl, 0, (void *)sc, 0, 235 CTL_HW, me->sysctl_num, CTL_CREATE, CTL_EOL); 236 237 sysctl_createv(NULL, 0, NULL, NULL, 238 CTLFLAG_READWRITE, 239 CTLTYPE_INT, "threshold", 240 SYSCTL_DESCR("environmental light threshold"), 241 lmu_sysctl_thresh, 1, (void *)sc, 0, 242 CTL_HW, me->sysctl_num, CTL_CREATE, CTL_EOL); 243 244 cv_init(&sc->sc_event, "lmu_event"); 245 mutex_init(&sc->sc_evmtx, MUTEX_DEFAULT, IPL_NONE); 246 247 if (kthread_create(PRI_NONE, 0, NULL, lmu_adjust, sc, &sc->sc_adjust, 248 "%s", "lmu") != 0) { 249 aprint_error_dev(self, "unable to create event kthread\n"); 250 } 251 } 252 253 static void 254 lmu_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 255 { 256 struct lmu_softc *sc = sme->sme_cookie; 257 int ret; 258 259 edata->state = ENVSYS_SINVALID; 260 if ( edata->private < 3) { 261 ret = lmu_get_brightness(sc, edata->private); 262 if (ret == -1) return; 263 edata->value_cur = ret; 264 } 265 edata->state = ENVSYS_SVALID; 266 } 267 268 static int 269 lmu_get_brightness(struct lmu_softc *sc, int reg) 270 { 271 int error, i; 272 uint16_t buf[2]; 273 uint8_t cmd = 0; 274 275 if (reg > 1) return -1; 276 if (time_second == sc->sc_last) 277 return sc->sc_lux[reg]; 278 279 iic_acquire_bus(sc->sc_i2c, 0); 280 error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, 281 sc->sc_addr, &cmd, 1, buf, 4, 0); 282 iic_release_bus(sc->sc_i2c, 0); 283 284 if (error) return -1; 285 sc->sc_last = time_second; 286 287 for (i = 0; i < 2; i++) 288 sc->sc_lux[i] = be16toh(buf[i]); 289 290 DPRINTF("<%d %04x %04x>", reg, buf[0], buf[1]); 291 292 return (sc->sc_lux[reg]); 293 } 294 295 static void 296 lmu_set_brightness(struct lmu_softc *sc, int b) 297 { 298 uint8_t cmd[3]; 299 300 cmd[0] = 1; 301 302 cmd[1] = (b & 0xff); 303 cmd[2] = (b & 0xff) >> 8; 304 305 iic_acquire_bus(sc->sc_i2c, 0); 306 iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, 307 sc->sc_addr, &cmd, 3, NULL, 0, 0); 308 iic_release_bus(sc->sc_i2c, 0); 309 } 310 311 static void 312 lmu_adjust(void *cookie) 313 { 314 struct lmu_softc *sc = cookie; 315 int left, right, b, offset, ticks; 316 317 while (1) { 318 ticks = LMU_POLL; 319 left = lmu_get_brightness(sc, 1); 320 right = lmu_get_brightness(sc, 0); 321 b = left > right ? left : right; 322 323 if ((b > (sc->sc_thresh + sc->sc_hyst)) || 324 !(sc->sc_lid_state && sc->sc_video_state)) { 325 sc->sc_target = 0; 326 } else if (b < sc->sc_thresh) { 327 sc->sc_target = sc->sc_level; 328 } 329 330 if (sc->sc_target != sc->sc_current) { 331 offset = ((sc->sc_target - sc->sc_current) > 0) ? 2 : -2; 332 sc->sc_current += offset; 333 if (sc->sc_current > sc->sc_level) sc->sc_current = sc->sc_level; 334 if (sc->sc_current < 0) sc->sc_current = 0; 335 336 DPRINTF("[%d]", sc->sc_current); 337 lmu_set_brightness(sc, sc->sc_current); 338 339 if (sc->sc_target != sc->sc_current) ticks = LMU_FADE; 340 } 341 342 mutex_enter(&sc->sc_evmtx); 343 cv_timedwait(&sc->sc_event, &sc->sc_evmtx, ticks); 344 mutex_exit(&sc->sc_evmtx); 345 } 346 } 347 348 static int 349 lmu_sysctl(SYSCTLFN_ARGS) 350 { 351 struct sysctlnode node = *rnode; 352 struct lmu_softc *sc = node.sysctl_data; 353 int target; 354 355 target = sc->sc_level; 356 node.sysctl_data = ⌖ 357 if (sysctl_lookup(SYSCTLFN_CALL(&node)) == 0) { 358 int new_reg; 359 360 new_reg = *(int *)node.sysctl_data; 361 if (new_reg != sc->sc_target) { 362 sc->sc_level = target; 363 sc->sc_target = target; 364 365 } 366 return 0; 367 } 368 return EINVAL; 369 } 370 371 static int 372 lmu_sysctl_thresh(SYSCTLFN_ARGS) 373 { 374 struct sysctlnode node = *rnode; 375 struct lmu_softc *sc = node.sysctl_data; 376 int thresh; 377 378 thresh = sc->sc_thresh; 379 node.sysctl_data = &thresh; 380 if (sysctl_lookup(SYSCTLFN_CALL(&node)) == 0) { 381 int new_reg; 382 383 new_reg = *(int *)node.sysctl_data; 384 if (new_reg != sc->sc_thresh && new_reg > 0) { 385 sc->sc_thresh = new_reg; 386 } 387 return 0; 388 } 389 return EINVAL; 390 } 391
Indexes created Wed Oct 01 07:09:59 GMT 2025