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 #ifdef CONFIG_LEDS_PCA9532_GPIO 258 static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset) 259 { 260 struct pca9532_data *data = gpiochip_get_data(gc); 261 struct pca9532_led *led = &data->leds[offset]; 262 263 if (led->type == PCA9532_TYPE_GPIO) 264 return 0; 265 266 return -EBUSY; 267 } 268 269 static void pca9532_gpio_set_value(struct gpio_chip *gc, unsigned offset, int val) 270 { 271 struct pca9532_data *data = gpiochip_get_data(gc); 272 struct pca9532_led *led = &data->leds[offset]; 273 274 if (val) 275 led->state = PCA9532_ON; 276 else 277 led->state = PCA9532_OFF; 278 279 pca9532_setled(led); 280 } 281 282 static int pca9532_gpio_get_value(struct gpio_chip *gc, unsigned offset) 283 { 284 struct pca9532_data *data = gpiochip_get_data(gc); 285 unsigned char reg; 286 287 reg = i2c_smbus_read_byte_data(data->client, PCA9532_REG_INPUT(offset)); 288 289 return !!(reg & (1 << (offset % 8))); 290 } 291 292 static int pca9532_gpio_direction_input(struct gpio_chip *gc, unsigned offset) 293 { 294 /* To use as input ensure pin is not driven */ 295 pca9532_gpio_set_value(gc, offset, 0); 296 297 return 0; 298 } 299 300 static int pca9532_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int val) 301 { 302 pca9532_gpio_set_value(gc, offset, val); 303 304 return 0; 305 } 306 #endif /* CONFIG_LEDS_PCA9532_GPIO */ 307 308 static int pca9532_destroy_devices(struct pca9532_data *data, int n_devs) 309 { 310 int i = n_devs; 311 312 if (!data) 313 return -EINVAL; 314 315 while (--i >= 0) { 316 switch (data->leds[i].type) { 317 case PCA9532_TYPE_NONE: 318 case PCA9532_TYPE_GPIO: 319 break; 320 case PCA9532_TYPE_LED: 321 led_classdev_unregister(&data->leds[i].ldev); 322 break; 323 case PCA9532_TYPE_N2100_BEEP: 324 if (data->idev != NULL) { 325 cancel_work_sync(&data->work); 326 data->idev = NULL; 327 } 328 break; 329 } 330 } 331 332 #ifdef CONFIG_LEDS_PCA9532_GPIO 333 if (data->gpio.parent) 334 gpiochip_remove(&data->gpio); 335 #endif 336 337 return 0; 338 } 339 340 static int pca9532_configure(struct i2c_client *client, 341 struct pca9532_data *data, struct pca9532_platform_data *pdata) 342 { 343 int i, err = 0; 344 int gpios = 0; 345 u8 maxleds = data->chip_info->num_leds; 346 347 for (i = 0; i < 2; i++) { 348 data->pwm[i] = pdata->pwm[i]; 349 data->psc[i] = pdata->psc[i]; 350 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, i), 351 data->pwm[i]); 352 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, i), 353 data->psc[i]); 354 } 355 356 for (i = 0; i < data->chip_info->num_leds; i++) { 357 struct pca9532_led *led = &data->leds[i]; 358 struct pca9532_led *pled = &pdata->leds[i]; 359 led->client = client; 360 led->id = i; 361 led->type = pled->type; 362 switch (led->type) { 363 case PCA9532_TYPE_NONE: 364 break; 365 case PCA9532_TYPE_GPIO: 366 gpios++; 367 break; 368 case PCA9532_TYPE_LED: 369 led->state = pled->state; 370 led->name = pled->name; 371 led->ldev.name = led->name; 372 led->ldev.default_trigger = pled->default_trigger; 373 led->ldev.brightness = LED_OFF; 374 led->ldev.brightness_set_blocking = 375 pca9532_set_brightness; 376 led->ldev.blink_set = pca9532_set_blink; 377 err = led_classdev_register(&client->dev, &led->ldev); 378 if (err < 0) { 379 dev_err(&client->dev, 380 "couldn't register LED %s\n", 381 led->name); 382 goto exit; 383 } 384 pca9532_setled(led); 385 break; 386 case PCA9532_TYPE_N2100_BEEP: 387 BUG_ON(data->idev); 388 led->state = PCA9532_PWM1; 389 pca9532_setled(led); 390 data->idev = devm_input_allocate_device(&client->dev); 391 if (data->idev == NULL) { 392 err = -ENOMEM; 393 goto exit; 394 } 395 data->idev->name = pled->name; 396 data->idev->phys = "i2c/pca9532"; 397 data->idev->id.bustype = BUS_HOST; 398 data->idev->id.vendor = 0x001f; 399 data->idev->id.product = 0x0001; 400 data->idev->id.version = 0x0100; 401 data->idev->evbit[0] = BIT_MASK(EV_SND); 402 data->idev->sndbit[0] = BIT_MASK(SND_BELL) | 403 BIT_MASK(SND_TONE); 404 data->idev->event = pca9532_event; 405 input_set_drvdata(data->idev, data); 406 INIT_WORK(&data->work, pca9532_input_work); 407 err = input_register_device(data->idev); 408 if (err) { 409 cancel_work_sync(&data->work); 410 data->idev = NULL; 411 goto exit; 412 } 413 break; 414 } 415 } 416 417 #ifdef CONFIG_LEDS_PCA9532_GPIO 418 if (gpios) { 419 data->gpio.label = "gpio-pca9532"; 420 data->gpio.direction_input = pca9532_gpio_direction_input; 421 data->gpio.direction_output = pca9532_gpio_direction_output; 422 data->gpio.set = pca9532_gpio_set_value; 423 data->gpio.get = pca9532_gpio_get_value; 424 data->gpio.request = pca9532_gpio_request_pin; 425 data->gpio.can_sleep = 1; 426 data->gpio.base = pdata->gpio_base; 427 data->gpio.ngpio = data->chip_info->num_leds; 428 data->gpio.parent = &client->dev; 429 data->gpio.owner = THIS_MODULE; 430 431 err = gpiochip_add_data(&data->gpio, data); 432 if (err) { 433 /* Use data->gpio.dev as a flag for freeing gpiochip */ 434 data->gpio.parent = NULL; 435 dev_warn(&client->dev, "could not add gpiochip\n"); 436 } else { 437 dev_info(&client->dev, "gpios %i...%i\n", 438 data->gpio.base, data->gpio.base + 439 data->gpio.ngpio - 1); 440 } 441 } 442 #endif 443 444 return 0; 445 446 exit: 447 pca9532_destroy_devices(data, i); 448 return err; 449 } 450 451 static struct pca9532_platform_data * 452 pca9532_of_populate_pdata(struct device *dev, struct device_node *np) 453 { 454 struct pca9532_platform_data *pdata; 455 struct device_node *child; 456 const struct of_device_id *match; 457 int devid, maxleds; 458 int i = 0; 459 460 match = of_match_device(of_pca9532_leds_match, dev); 461 if (!match) 462 return ERR_PTR(-ENODEV); 463 464 devid = (int)(uintptr_t)match->data; 465 maxleds = pca9532_chip_info_tbl[devid].num_leds; 466 467 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 468 if (!pdata) 469 return ERR_PTR(-ENOMEM); 470 471 for_each_child_of_node(np, child) { 472 if (of_property_read_string(child, "label", 473 &pdata->leds[i].name)) 474 pdata->leds[i].name = child->name; 475 of_property_read_u32(child, "type", &pdata->leds[i].type); 476 of_property_read_string(child, "linux,default-trigger", 477 &pdata->leds[i].default_trigger); 478 if (++i >= maxleds) { 479 of_node_put(child); 480 break; 481 } 482 } 483 484 return pdata; 485 } 486 487 static int pca9532_probe(struct i2c_client *client, 488 const struct i2c_device_id *id) 489 { 490 int devid; 491 struct pca9532_data *data = i2c_get_clientdata(client); 492 struct pca9532_platform_data *pca9532_pdata = 493 dev_get_platdata(&client->dev); 494 struct device_node *np = client->dev.of_node; 495 496 if (!pca9532_pdata) { 497 if (np) { 498 pca9532_pdata = 499 pca9532_of_populate_pdata(&client->dev, np); 500 if (IS_ERR(pca9532_pdata)) 501 return PTR_ERR(pca9532_pdata); 502 } else { 503 dev_err(&client->dev, "no platform data\n"); 504 return -EINVAL; 505 } 506 devid = (int)(uintptr_t)of_match_device( 507 of_pca9532_leds_match, &client->dev)->data; 508 } else { 509 devid = id->driver_data; 510 } 511 512 if (!i2c_check_functionality(client->adapter, 513 I2C_FUNC_SMBUS_BYTE_DATA)) 514 return -EIO; 515 516 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); 517 if (!data) 518 return -ENOMEM; 519 520 data->chip_info = &pca9532_chip_info_tbl[devid]; 521 522 dev_info(&client->dev, "setting platform data\n"); 523 i2c_set_clientdata(client, data); 524 data->client = client; 525 mutex_init(&data->update_lock); 526 527 return pca9532_configure(client, data, pca9532_pdata); 528 } 529 530 static int pca9532_remove(struct i2c_client *client) 531 { 532 struct pca9532_data *data = i2c_get_clientdata(client); 533 int err; 534 535 err = pca9532_destroy_devices(data, data->chip_info->num_leds); 536 if (err) 537 return err; 538 539 return 0; 540 } 541 542 module_i2c_driver(pca9532_driver); 543 544 MODULE_AUTHOR("Riku Voipio"); 545 MODULE_LICENSE("GPL"); 546 MODULE_DESCRIPTION("PCA 9532 LED dimmer"); 547