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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 | // SPDX-License-Identifier: GPL-2.0-or-later /* * LED driver for Mediatek MT6323 PMIC * * Copyright (C) 2017 Sean Wang <sean.wang@mediatek.com> */ #include <linux/kernel.h> #include <linux/leds.h> #include <linux/mfd/mt6323/registers.h> #include <linux/mfd/mt6397/core.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/regmap.h> /* * Register field for MT6323_TOP_CKPDN0 to enable * 32K clock common for LED device. */ #define MT6323_RG_DRV_32K_CK_PDN BIT(11) #define MT6323_RG_DRV_32K_CK_PDN_MASK BIT(11) /* * Register field for MT6323_TOP_CKPDN2 to enable * individual clock for LED device. */ #define MT6323_RG_ISINK_CK_PDN(i) BIT(i) #define MT6323_RG_ISINK_CK_PDN_MASK(i) BIT(i) /* * Register field for MT6323_TOP_CKCON1 to select * clock source. */ #define MT6323_RG_ISINK_CK_SEL_MASK(i) (BIT(10) << (i)) /* * Register for MT6323_ISINK_CON0 to setup the * duty cycle of the blink. */ #define MT6323_ISINK_CON0(i) (MT6323_ISINK0_CON0 + 0x8 * (i)) #define MT6323_ISINK_DIM_DUTY_MASK (0x1f << 8) #define MT6323_ISINK_DIM_DUTY(i) (((i) << 8) & \ MT6323_ISINK_DIM_DUTY_MASK) /* Register to setup the period of the blink. */ #define MT6323_ISINK_CON1(i) (MT6323_ISINK0_CON1 + 0x8 * (i)) #define MT6323_ISINK_DIM_FSEL_MASK (0xffff) #define MT6323_ISINK_DIM_FSEL(i) ((i) & MT6323_ISINK_DIM_FSEL_MASK) /* Register to control the brightness. */ #define MT6323_ISINK_CON2(i) (MT6323_ISINK0_CON2 + 0x8 * (i)) #define MT6323_ISINK_CH_STEP_SHIFT 12 #define MT6323_ISINK_CH_STEP_MASK (0x7 << 12) #define MT6323_ISINK_CH_STEP(i) (((i) << 12) & \ MT6323_ISINK_CH_STEP_MASK) #define MT6323_ISINK_SFSTR0_TC_MASK (0x3 << 1) #define MT6323_ISINK_SFSTR0_TC(i) (((i) << 1) & \ MT6323_ISINK_SFSTR0_TC_MASK) #define MT6323_ISINK_SFSTR0_EN_MASK BIT(0) #define MT6323_ISINK_SFSTR0_EN BIT(0) /* Register to LED channel enablement. */ #define MT6323_ISINK_CH_EN_MASK(i) BIT(i) #define MT6323_ISINK_CH_EN(i) BIT(i) #define MT6323_MAX_PERIOD 10000 #define MT6323_MAX_LEDS 4 #define MT6323_MAX_BRIGHTNESS 6 #define MT6323_UNIT_DUTY 3125 #define MT6323_CAL_HW_DUTY(o, p) DIV_ROUND_CLOSEST((o) * 100000ul,\ (p) * MT6323_UNIT_DUTY) struct mt6323_leds; /** * struct mt6323_led - state container for the LED device * @id: the identifier in MT6323 LED device * @parent: the pointer to MT6323 LED controller * @cdev: LED class device for this LED device * @current_brightness: current state of the LED device */ struct mt6323_led { int id; struct mt6323_leds *parent; struct led_classdev cdev; enum led_brightness current_brightness; }; /** * struct mt6323_leds - state container for holding LED controller * of the driver * @dev: the device pointer * @hw: the underlying hardware providing shared * bus for the register operations * @lock: the lock among process context * @led: the array that contains the state of individual * LED device */ struct mt6323_leds { struct device *dev; struct mt6397_chip *hw; /* protect among process context */ struct mutex lock; struct mt6323_led *led[MT6323_MAX_LEDS]; }; static int mt6323_led_hw_brightness(struct led_classdev *cdev, enum led_brightness brightness) { struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); struct mt6323_leds *leds = led->parent; struct regmap *regmap = leds->hw->regmap; u32 con2_mask = 0, con2_val = 0; int ret; /* * Setup current output for the corresponding * brightness level. */ con2_mask |= MT6323_ISINK_CH_STEP_MASK | MT6323_ISINK_SFSTR0_TC_MASK | MT6323_ISINK_SFSTR0_EN_MASK; con2_val |= MT6323_ISINK_CH_STEP(brightness - 1) | MT6323_ISINK_SFSTR0_TC(2) | MT6323_ISINK_SFSTR0_EN; ret = regmap_update_bits(regmap, MT6323_ISINK_CON2(led->id), con2_mask, con2_val); return ret; } static int mt6323_led_hw_off(struct led_classdev *cdev) { struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); struct mt6323_leds *leds = led->parent; struct regmap *regmap = leds->hw->regmap; unsigned int status; int ret; status = MT6323_ISINK_CH_EN(led->id); ret = regmap_update_bits(regmap, MT6323_ISINK_EN_CTRL, MT6323_ISINK_CH_EN_MASK(led->id), ~status); if (ret < 0) return ret; usleep_range(100, 300); ret = regmap_update_bits(regmap, MT6323_TOP_CKPDN2, MT6323_RG_ISINK_CK_PDN_MASK(led->id), MT6323_RG_ISINK_CK_PDN(led->id)); if (ret < 0) return ret; return 0; } static enum led_brightness mt6323_get_led_hw_brightness(struct led_classdev *cdev) { struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); struct mt6323_leds *leds = led->parent; struct regmap *regmap = leds->hw->regmap; unsigned int status; int ret; ret = regmap_read(regmap, MT6323_TOP_CKPDN2, &status); if (ret < 0) return ret; if (status & MT6323_RG_ISINK_CK_PDN_MASK(led->id)) return 0; ret = regmap_read(regmap, MT6323_ISINK_EN_CTRL, &status); if (ret < 0) return ret; if (!(status & MT6323_ISINK_CH_EN(led->id))) return 0; ret = regmap_read(regmap, MT6323_ISINK_CON2(led->id), &status); if (ret < 0) return ret; return ((status & MT6323_ISINK_CH_STEP_MASK) >> MT6323_ISINK_CH_STEP_SHIFT) + 1; } static int mt6323_led_hw_on(struct led_classdev *cdev, enum led_brightness brightness) { struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); struct mt6323_leds *leds = led->parent; struct regmap *regmap = leds->hw->regmap; unsigned int status; int ret; /* * Setup required clock source, enable the corresponding * clock and channel and let work with continuous blink as * the default. */ ret = regmap_update_bits(regmap, MT6323_TOP_CKCON1, MT6323_RG_ISINK_CK_SEL_MASK(led->id), 0); if (ret < 0) return ret; status = MT6323_RG_ISINK_CK_PDN(led->id); ret = regmap_update_bits(regmap, MT6323_TOP_CKPDN2, MT6323_RG_ISINK_CK_PDN_MASK(led->id), ~status); if (ret < 0) return ret; usleep_range(100, 300); ret = regmap_update_bits(regmap, MT6323_ISINK_EN_CTRL, MT6323_ISINK_CH_EN_MASK(led->id), MT6323_ISINK_CH_EN(led->id)); if (ret < 0) return ret; ret = mt6323_led_hw_brightness(cdev, brightness); if (ret < 0) return ret; ret = regmap_update_bits(regmap, MT6323_ISINK_CON0(led->id), MT6323_ISINK_DIM_DUTY_MASK, MT6323_ISINK_DIM_DUTY(31)); if (ret < 0) return ret; ret = regmap_update_bits(regmap, MT6323_ISINK_CON1(led->id), MT6323_ISINK_DIM_FSEL_MASK, MT6323_ISINK_DIM_FSEL(1000)); if (ret < 0) return ret; return 0; } static int mt6323_led_set_blink(struct led_classdev *cdev, unsigned long *delay_on, unsigned long *delay_off) { struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); struct mt6323_leds *leds = led->parent; struct regmap *regmap = leds->hw->regmap; unsigned long period; u8 duty_hw; int ret; /* * Units are in ms, if over the hardware able * to support, fallback into software blink */ period = *delay_on + *delay_off; if (period > MT6323_MAX_PERIOD) return -EINVAL; /* * LED subsystem requires a default user * friendly blink pattern for the LED so using * 1Hz duty cycle 50% here if without specific * value delay_on and delay off being assigned. */ if (!*delay_on && !*delay_off) { *delay_on = 500; *delay_off = 500; } /* * Calculate duty_hw based on the percentage of period during * which the led is ON. */ duty_hw = MT6323_CAL_HW_DUTY(*delay_on, period); /* hardware doesn't support zero duty cycle. */ if (!duty_hw) return -EINVAL; mutex_lock(&leds->lock); /* * Set max_brightness as the software blink behavior * when no blink brightness. */ if (!led->current_brightness) { ret = mt6323_led_hw_on(cdev, cdev->max_brightness); if (ret < 0) goto out; led->current_brightness = cdev->max_brightness; } ret = regmap_update_bits(regmap, MT6323_ISINK_CON0(led->id), MT6323_ISINK_DIM_DUTY_MASK, MT6323_ISINK_DIM_DUTY(duty_hw - 1)); if (ret < 0) goto out; ret = regmap_update_bits(regmap, MT6323_ISINK_CON1(led->id), MT6323_ISINK_DIM_FSEL_MASK, MT6323_ISINK_DIM_FSEL(period - 1)); out: mutex_unlock(&leds->lock); return ret; } static int mt6323_led_set_brightness(struct led_classdev *cdev, enum led_brightness brightness) { struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); struct mt6323_leds *leds = led->parent; int ret; mutex_lock(&leds->lock); if (!led->current_brightness && brightness) { ret = mt6323_led_hw_on(cdev, brightness); if (ret < 0) goto out; } else if (brightness) { ret = mt6323_led_hw_brightness(cdev, brightness); if (ret < 0) goto out; } else { ret = mt6323_led_hw_off(cdev); if (ret < 0) goto out; } led->current_brightness = brightness; out: mutex_unlock(&leds->lock); return ret; } static int mt6323_led_set_dt_default(struct led_classdev *cdev, struct device_node *np) { struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); const char *state; int ret = 0; led->cdev.name = of_get_property(np, "label", NULL) ? : np->name; led->cdev.default_trigger = of_get_property(np, "linux,default-trigger", NULL); state = of_get_property(np, "default-state", NULL); if (state) { if (!strcmp(state, "keep")) { ret = mt6323_get_led_hw_brightness(cdev); if (ret < 0) return ret; led->current_brightness = ret; ret = 0; } else if (!strcmp(state, "on")) { ret = mt6323_led_set_brightness(cdev, cdev->max_brightness); } else { ret = mt6323_led_set_brightness(cdev, LED_OFF); } } return ret; } static int mt6323_led_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *np = pdev->dev.of_node; struct device_node *child; struct mt6397_chip *hw = dev_get_drvdata(pdev->dev.parent); struct mt6323_leds *leds; struct mt6323_led *led; int ret; unsigned int status; u32 reg; leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL); if (!leds) return -ENOMEM; platform_set_drvdata(pdev, leds); leds->dev = dev; /* * leds->hw points to the underlying bus for the register * controlled. */ leds->hw = hw; mutex_init(&leds->lock); status = MT6323_RG_DRV_32K_CK_PDN; ret = regmap_update_bits(leds->hw->regmap, MT6323_TOP_CKPDN0, MT6323_RG_DRV_32K_CK_PDN_MASK, ~status); if (ret < 0) { dev_err(leds->dev, "Failed to update MT6323_TOP_CKPDN0 Register\n"); return ret; } for_each_available_child_of_node(np, child) { ret = of_property_read_u32(child, "reg", ®); if (ret) { dev_err(dev, "Failed to read led 'reg' property\n"); goto put_child_node; } if (reg >= MT6323_MAX_LEDS || leds->led[reg]) { dev_err(dev, "Invalid led reg %u\n", reg); ret = -EINVAL; goto put_child_node; } led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL); if (!led) { ret = -ENOMEM; goto put_child_node; } leds->led[reg] = led; leds->led[reg]->id = reg; leds->led[reg]->cdev.max_brightness = MT6323_MAX_BRIGHTNESS; leds->led[reg]->cdev.brightness_set_blocking = mt6323_led_set_brightness; leds->led[reg]->cdev.blink_set = mt6323_led_set_blink; leds->led[reg]->cdev.brightness_get = mt6323_get_led_hw_brightness; leds->led[reg]->parent = leds; ret = mt6323_led_set_dt_default(&leds->led[reg]->cdev, child); if (ret < 0) { dev_err(leds->dev, "Failed to LED set default from devicetree\n"); goto put_child_node; } ret = devm_led_classdev_register(dev, &leds->led[reg]->cdev); if (ret) { dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); goto put_child_node; } leds->led[reg]->cdev.dev->of_node = child; } return 0; put_child_node: of_node_put(child); return ret; } static int mt6323_led_remove(struct platform_device *pdev) { struct mt6323_leds *leds = platform_get_drvdata(pdev); int i; /* Turn the LEDs off on driver removal. */ for (i = 0 ; leds->led[i] ; i++) mt6323_led_hw_off(&leds->led[i]->cdev); regmap_update_bits(leds->hw->regmap, MT6323_TOP_CKPDN0, MT6323_RG_DRV_32K_CK_PDN_MASK, MT6323_RG_DRV_32K_CK_PDN); mutex_destroy(&leds->lock); return 0; } static const struct of_device_id mt6323_led_dt_match[] = { { .compatible = "mediatek,mt6323-led" }, {}, }; MODULE_DEVICE_TABLE(of, mt6323_led_dt_match); static struct platform_driver mt6323_led_driver = { .probe = mt6323_led_probe, .remove = mt6323_led_remove, .driver = { .name = "mt6323-led", .of_match_table = mt6323_led_dt_match, }, }; module_platform_driver(mt6323_led_driver); MODULE_DESCRIPTION("LED driver for Mediatek MT6323 PMIC"); MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>"); MODULE_LICENSE("GPL"); |