1 /* 2 * pca9532.c - 16-bit Led dimmer 3 * 4 * Copyright (C) 2011 Jan Weitzel 5 * Copyright (C) 2008 Riku Voipio 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; version 2 of the License. 10 * 11 * Datasheet: http://www.nxp.com/documents/data_sheet/PCA9532.pdf 12 * 13 */ 14 15 #include <linux/module.h> 16 #include <linux/i2c.h> 17 #include <linux/slab.h> 18 #include <linux/leds.h> 19 #include <linux/input.h> 20 #include <linux/mutex.h> 21 #include <linux/workqueue.h> 22 #include <linux/leds-pca9532.h> 23 #include <linux/gpio.h> 24 #include <linux/of.h> 25 #include <linux/of_device.h> 26 27 /* m = num_leds*/ 28 #define PCA9532_REG_INPUT(i) ((i) >> 3) 29 #define PCA9532_REG_OFFSET(m) ((m) >> 4) 30 #define PCA9532_REG_PSC(m, i) (PCA9532_REG_OFFSET(m) + 0x1 + (i) * 2) 31 #define PCA9532_REG_PWM(m, i) (PCA9532_REG_OFFSET(m) + 0x2 + (i) * 2) 32 #define LED_REG(m, led) (PCA9532_REG_OFFSET(m) + 0x5 + (led >> 2)) 33 #define LED_NUM(led) (led & 0x3) 34 35 #define ldev_to_led(c) container_of(c, struct pca9532_led, ldev) 36 37 struct pca9532_chip_info { 38 u8 num_leds; 39 }; 40 41 struct pca9532_data { 42 struct i2c_client *client; 43 struct pca9532_led leds[16]; 44 struct mutex update_lock; 45 struct input_dev *idev; 46 struct work_struct work; 47 #ifdef CONFIG_LEDS_PCA9532_GPIO 48 struct gpio_chip gpio; 49 #endif 50 const struct pca9532_chip_info *chip_info; 51 u8 pwm[2]; 52 u8 psc[2]; 53 }; 54 55 static int pca9532_probe(struct i2c_client *client, 56 const struct i2c_device_id *id); 57 static int pca9532_remove(struct i2c_client *client); 58 59 enum { 60 pca9530, 61 pca9531, 62 pca9532, 63 pca9533, 64 }; 65 66 static const struct i2c_device_id pca9532_id[] = { 67 { "pca9530", pca9530 }, 68 { "pca9531", pca9531 }, 69 { "pca9532", pca9532 }, 70 { "pca9533", pca9533 }, 71 { } 72 }; 73 74 MODULE_DEVICE_TABLE(i2c, pca9532_id); 75 76 static const struct pca9532_chip_info pca9532_chip_info_tbl[] = { 77 [pca9530] = { 78 .num_leds = 2, 79 }, 80 [pca9531] = { 81 .num_leds = 8, 82 }, 83 [pca9532] = { 84 .num_leds = 16, 85 }, 86 [pca9533] = { 87 .num_leds = 4, 88 }, 89 }; 90 91 #ifdef CONFIG_OF 92 static const struct of_device_id of_pca9532_leds_match[] = { 93 { .compatible = "nxp,pca9530", .data = (void *)pca9530 }, 94 { .compatible = "nxp,pca9531", .data = (void *)pca9531 }, 95 { .compatible = "nxp,pca9532", .data = (void *)pca9532 }, 96 { .compatible = "nxp,pca9533", .data = (void *)pca9533 }, 97 {}, 98 }; 99 100 MODULE_DEVICE_TABLE(of, of_pca9532_leds_match); 101 #endif 102 103 static struct i2c_driver pca9532_driver = { 104 .driver = { 105 .name = "leds-pca953x", 106 .of_match_table = of_match_ptr(of_pca9532_leds_match), 107 }, 108 .probe = pca9532_probe, 109 .remove = pca9532_remove, 110 .id_table = pca9532_id, 111 }; 112 113 /* We have two pwm/blinkers, but 16 possible leds to drive. Additionally, 114 * the clever Thecus people are using one pwm to drive the beeper. So, 115 * as a compromise we average one pwm to the values requested by all 116 * leds that are not ON/OFF. 117 * */ 118 static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink, 119 enum led_brightness value) 120 { 121 int a = 0, b = 0, i = 0; 122 struct pca9532_data *data = i2c_get_clientdata(client); 123 for (i = 0; i < data->chip_info->num_leds; i++) { 124 if (data->leds[i].type == PCA9532_TYPE_LED && 125 data->leds[i].state == PCA9532_PWM0+pwm) { 126 a++; 127 b += data->leds[i].ldev.brightness; 128 } 129 } 130 if (a == 0) { 131 dev_err(&client->dev, 132 "fear of division by zero %d/%d, wanted %d\n", 133 b, a, value); 134 return -EINVAL; 135 } 136 b = b/a; 137 if (b > 0xFF) 138 return -EINVAL; 139 data->pwm[pwm] = b; 140 data->psc[pwm] = blink; 141 return 0; 142 } 143 144 static int pca9532_setpwm(struct i2c_client *client, int pwm) 145 { 146 struct pca9532_data *data = i2c_get_clientdata(client); 147 u8 maxleds = data->chip_info->num_leds; 148 149 mutex_lock(&data->update_lock); 150 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, pwm), 151 data->pwm[pwm]); 152 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, pwm), 153 data->psc[pwm]); 154 mutex_unlock(&data->update_lock); 155 return 0; 156 } 157 158 /* Set LED routing */ 159 static void pca9532_setled(struct pca9532_led *led) 160 { 161 struct i2c_client *client = led->client; 162 struct pca9532_data *data = i2c_get_clientdata(client); 163 u8 maxleds = data->chip_info->num_leds; 164 char reg; 165 166 mutex_lock(&data->update_lock); 167 reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id)); 168 /* zero led bits */ 169 reg = reg & ~(0x3<<LED_NUM(led->id)*2); 170 /* set the new value */ 171 reg = reg | (led->state << LED_NUM(led->id)*2); 172 i2c_smbus_write_byte_data(client, LED_REG(maxleds, led->id), reg); 173 mutex_unlock(&data->update_lock); 174 } 175 176 static int pca9532_set_brightness(struct led_classdev *led_cdev, 177 enum led_brightness value) 178 { 179 int err = 0; 180 struct pca9532_led *led = ldev_to_led(led_cdev); 181 182 if (value == LED_OFF) 183 led->state = PCA9532_OFF; 184 else if (value == LED_FULL) 185 led->state = PCA9532_ON; 186 else { 187 led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */ 188 err = pca9532_calcpwm(led->client, 0, 0, value); 189 if (err) 190 return err; 191 } 192 if (led->state == PCA9532_PWM0) 193 pca9532_setpwm(led->client, 0); 194 pca9532_setled(led); 195 return err; 196 } 197 198 static int pca9532_set_blink(struct led_classdev *led_cdev, 199 unsigned long *delay_on, unsigned long *delay_off) 200 { 201 struct pca9532_led *led = ldev_to_led(led_cdev); 202 struct i2c_client *client = led->client; 203 int psc; 204 int err = 0; 205 206 if (*delay_on == 0 && *delay_off == 0) { 207 /* led subsystem ask us for a blink rate */ 208 *delay_on = 1000; 209 *delay_off = 1000; 210 } 211 if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6) 212 return -EINVAL; 213 214 /* Thecus specific: only use PSC/PWM 0 */ 215 psc = (*delay_on * 152-1)/1000; 216 err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness); 217 if (err) 218 return err; 219 if (led->state == PCA9532_PWM0) 220 pca9532_setpwm(led->client, 0); 221 pca9532_setled(led); 222 223 return 0; 224 } 225 226 static int pca9532_event(struct input_dev *dev, unsigned int type, 227 unsigned int code, int value) 228 { 229 struct pca9532_data *data = input_get_drvdata(dev); 230 231 if (!(type == EV_SND && (code == SND_BELL || code == SND_TONE))) 232 return -1; 233 234 /* XXX: allow different kind of beeps with psc/pwm modifications */ 235 if (value > 1 && value < 32767) 236 data->pwm[1] = 127; 237 else 238 data->pwm[1] = 0; 239 240 schedule_work(&data->work); 241 242 return 0; 243 } 244 245 static void pca9532_input_work(struct work_struct *work) 246 { 247 struct pca9532_data *data = 248 container_of(work, struct pca9532_data, work); 249 u8 maxleds = data->chip_info->num_leds; 250 251 mutex_lock(&data->update_lock); 252 i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(maxleds, 1), 253 data->pwm[1]); 254 mutex_unlock(&data->update_lock); 255 } 256 257 static enum pca9532_state pca9532_getled(struct pca9532_led *led) 258 { 259 struct i2c_client *client = led->client; 260 struct pca9532_data *data = i2c_get_clientdata(client); 261 u8 maxleds = data->chip_info->num_leds; 262 char reg; 263 enum pca9532_state ret; 264 265 mutex_lock(&data->update_lock); 266 reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id)); 267 ret = reg >> LED_NUM(led->id)/2; 268 mutex_unlock(&data->update_lock); 269 return ret; 270 } 271 272 #ifdef CONFIG_LEDS_PCA9532_GPIO 273 static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset) 274 { 275 struct pca9532_data *data = gpiochip_get_data(gc); 276 struct pca9532_led *led = &data->leds[offset]; 277 278 if (led->type == PCA9532_TYPE_GPIO) 279 return 0; 280 281 return -EBUSY; 282 } 283 284 static void pca9532_gpio_set_value(struct gpio_chip *gc, unsigned offset, int val) 285 { 286 struct pca9532_data *data = gpiochip_get_data(gc); 287 struct pca9532_led *led = &data->leds[offset]; 288 289 if (val) 290 led->state = PCA9532_ON; 291 else 292 led->state = PCA9532_OFF; 293 294 pca9532_setled(led); 295 } 296 297 static int pca9532_gpio_get_value(struct gpio_chip *gc, unsigned offset) 298 { 299 struct pca9532_data *data = gpiochip_get_data(gc); 300 unsigned char reg; 301 302 reg = i2c_smbus_read_byte_data(data->client, PCA9532_REG_INPUT(offset)); 303 304 return !!(reg & (1 << (offset % 8))); 305 } 306 307 static int pca9532_gpio_direction_input(struct gpio_chip *gc, unsigned offset) 308 { 309 /* To use as input ensure pin is not driven */ 310 pca9532_gpio_set_value(gc, offset, 0); 311 312 return 0; 313 } 314 315 static int pca9532_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int val) 316 { 317 pca9532_gpio_set_value(gc, offset, val); 318 319 return 0; 320 } 321 #endif /* CONFIG_LEDS_PCA9532_GPIO */ 322 323 static int pca9532_destroy_devices(struct pca9532_data *data, int n_devs) 324 { 325 int i = n_devs; 326 327 if (!data) 328 return -EINVAL; 329 330 while (--i >= 0) { 331 switch (data->leds[i].type) { 332 case PCA9532_TYPE_NONE: 333 case PCA9532_TYPE_GPIO: 334 break; 335 case PCA9532_TYPE_LED: 336 led_classdev_unregister(&data->leds[i].ldev); 337 break; 338 case PCA9532_TYPE_N2100_BEEP: 339 if (data->idev != NULL) { 340 cancel_work_sync(&data->work); 341 data->idev = NULL; 342 } 343 break; 344 } 345 } 346 347 #ifdef CONFIG_LEDS_PCA9532_GPIO 348 if (data->gpio.parent) 349 gpiochip_remove(&data->gpio); 350 #endif 351 352 return 0; 353 } 354 355 static int pca9532_configure(struct i2c_client *client, 356 struct pca9532_data *data, struct pca9532_platform_data *pdata) 357 { 358 int i, err = 0; 359 int gpios = 0; 360 u8 maxleds = data->chip_info->num_leds; 361 362 for (i = 0; i < 2; i++) { 363 data->pwm[i] = pdata->pwm[i]; 364 data->psc[i] = pdata->psc[i]; 365 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, i), 366 data->pwm[i]); 367 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, i), 368 data->psc[i]); 369 } 370 371 for (i = 0; i < data->chip_info->num_leds; i++) { 372 struct pca9532_led *led = &data->leds[i]; 373 struct pca9532_led *pled = &pdata->leds[i]; 374 led->client = client; 375 led->id = i; 376 led->type = pled->type; 377 switch (led->type) { 378 case PCA9532_TYPE_NONE: 379 break; 380 case PCA9532_TYPE_GPIO: 381 gpios++; 382 break; 383 case PCA9532_TYPE_LED: 384 if (pled->state == PCA9532_KEEP) 385 led->state = pca9532_getled(led); 386 else 387 led->state = pled->state; 388 led->name = pled->name; 389 led->ldev.name = led->name; 390 led->ldev.default_trigger = pled->default_trigger; 391 led->ldev.brightness = LED_OFF; 392 led->ldev.brightness_set_blocking = 393 pca9532_set_brightness; 394 led->ldev.blink_set = pca9532_set_blink; 395 err = led_classdev_register(&client->dev, &led->ldev); 396 if (err < 0) { 397 dev_err(&client->dev, 398 "couldn't register LED %s\n", 399 led->name); 400 goto exit; 401 } 402 pca9532_setled(led); 403 break; 404 case PCA9532_TYPE_N2100_BEEP: 405 BUG_ON(data->idev); 406 led->state = PCA9532_PWM1; 407 pca9532_setled(led); 408 data->idev = devm_input_allocate_device(&client->dev); 409 if (data->idev == NULL) { 410 err = -ENOMEM; 411 goto exit; 412 } 413 data->idev->name = pled->name; 414 data->idev->phys = "i2c/pca9532"; 415 data->idev->id.bustype = BUS_HOST; 416 data->idev->id.vendor = 0x001f; 417 data->idev->id.product = 0x0001; 418 data->idev->id.version = 0x0100; 419 data->idev->evbit[0] = BIT_MASK(EV_SND); 420 data->idev->sndbit[0] = BIT_MASK(SND_BELL) | 421 BIT_MASK(SND_TONE); 422 data->idev->event = pca9532_event; 423 input_set_drvdata(data->idev, data); 424 INIT_WORK(&data->work, pca9532_input_work); 425 err = input_register_device(data->idev); 426 if (err) { 427 cancel_work_sync(&data->work); 428 data->idev = NULL; 429 goto exit; 430 } 431 break; 432 } 433 } 434 435 #ifdef CONFIG_LEDS_PCA9532_GPIO 436 if (gpios) { 437 data->gpio.label = "gpio-pca9532"; 438 data->gpio.direction_input = pca9532_gpio_direction_input; 439 data->gpio.direction_output = pca9532_gpio_direction_output; 440 data->gpio.set = pca9532_gpio_set_value; 441 data->gpio.get = pca9532_gpio_get_value; 442 data->gpio.request = pca9532_gpio_request_pin; 443 data->gpio.can_sleep = 1; 444 data->gpio.base = pdata->gpio_base; 445 data->gpio.ngpio = data->chip_info->num_leds; 446 data->gpio.parent = &client->dev; 447 data->gpio.owner = THIS_MODULE; 448 449 err = gpiochip_add_data(&data->gpio, data); 450 if (err) { 451 /* Use data->gpio.dev as a flag for freeing gpiochip */ 452 data->gpio.parent = NULL; 453 dev_warn(&client->dev, "could not add gpiochip\n"); 454 } else { 455 dev_info(&client->dev, "gpios %i...%i\n", 456 data->gpio.base, data->gpio.base + 457 data->gpio.ngpio - 1); 458 } 459 } 460 #endif 461 462 return 0; 463 464 exit: 465 pca9532_destroy_devices(data, i); 466 return err; 467 } 468 469 static struct pca9532_platform_data * 470 pca9532_of_populate_pdata(struct device *dev, struct device_node *np) 471 { 472 struct pca9532_platform_data *pdata; 473 struct device_node *child; 474 const struct of_device_id *match; 475 int devid, maxleds; 476 int i = 0; 477 const char *state; 478 479 match = of_match_device(of_pca9532_leds_match, dev); 480 if (!match) 481 return ERR_PTR(-ENODEV); 482 483 devid = (int)(uintptr_t)match->data; 484 maxleds = pca9532_chip_info_tbl[devid].num_leds; 485 486 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 487 if (!pdata) 488 return ERR_PTR(-ENOMEM); 489 490 for_each_child_of_node(np, child) { 491 if (of_property_read_string(child, "label", 492 &pdata->leds[i].name)) 493 pdata->leds[i].name = child->name; 494 of_property_read_u32(child, "type", &pdata->leds[i].type); 495 of_property_read_string(child, "linux,default-trigger", 496 &pdata->leds[i].default_trigger); 497 if (!of_property_read_string(child, "default-state", &state)) { 498 if (!strcmp(state, "on")) 499 pdata->leds[i].state = PCA9532_ON; 500 else if (!strcmp(state, "keep")) 501 pdata->leds[i].state = PCA9532_KEEP; 502 } 503 if (++i >= maxleds) { 504 of_node_put(child); 505 break; 506 } 507 } 508 509 return pdata; 510 } 511 512 static int pca9532_probe(struct i2c_client *client, 513 const struct i2c_device_id *id) 514 { 515 int devid; 516 const struct of_device_id *of_id; 517 struct pca9532_data *data = i2c_get_clientdata(client); 518 struct pca9532_platform_data *pca9532_pdata = 519 dev_get_platdata(&client->dev); 520 struct device_node *np = client->dev.of_node; 521 522 if (!pca9532_pdata) { 523 if (np) { 524 pca9532_pdata = 525 pca9532_of_populate_pdata(&client->dev, np); 526 if (IS_ERR(pca9532_pdata)) 527 return PTR_ERR(pca9532_pdata); 528 } else { 529 dev_err(&client->dev, "no platform data\n"); 530 return -EINVAL; 531 } 532 of_id = of_match_device(of_pca9532_leds_match, 533 &client->dev); 534 if (unlikely(!of_id)) 535 return -EINVAL; 536 devid = (int)(uintptr_t) of_id->data; 537 } else { 538 devid = id->driver_data; 539 } 540 541 if (!i2c_check_functionality(client->adapter, 542 I2C_FUNC_SMBUS_BYTE_DATA)) 543 return -EIO; 544 545 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); 546 if (!data) 547 return -ENOMEM; 548 549 data->chip_info = &pca9532_chip_info_tbl[devid]; 550 551 dev_info(&client->dev, "setting platform data\n"); 552 i2c_set_clientdata(client, data); 553 data->client = client; 554 mutex_init(&data->update_lock); 555 556 return pca9532_configure(client, data, pca9532_pdata); 557 } 558 559 static int pca9532_remove(struct i2c_client *client) 560 { 561 struct pca9532_data *data = i2c_get_clientdata(client); 562 int err; 563 564 err = pca9532_destroy_devices(data, data->chip_info->num_leds); 565 if (err) 566 return err; 567 568 return 0; 569 } 570 571 module_i2c_driver(pca9532_driver); 572 573 MODULE_AUTHOR("Riku Voipio"); 574 MODULE_LICENSE("GPL"); 575 MODULE_DESCRIPTION("PCA 9532 LED dimmer"); 576