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 25 /* m = num_leds*/ 26 #define PCA9532_REG_INPUT(i) ((i) >> 3) 27 #define PCA9532_REG_OFFSET(m) ((m) >> 4) 28 #define PCA9532_REG_PSC(m, i) (PCA9532_REG_OFFSET(m) + 0x1 + (i) * 2) 29 #define PCA9532_REG_PWM(m, i) (PCA9532_REG_OFFSET(m) + 0x2 + (i) * 2) 30 #define LED_REG(m, led) (PCA9532_REG_OFFSET(m) + 0x5 + (led >> 2)) 31 #define LED_NUM(led) (led & 0x3) 32 33 #define ldev_to_led(c) container_of(c, struct pca9532_led, ldev) 34 35 struct pca9532_chip_info { 36 u8 num_leds; 37 }; 38 39 struct pca9532_data { 40 struct i2c_client *client; 41 struct pca9532_led leds[16]; 42 struct mutex update_lock; 43 struct input_dev *idev; 44 struct work_struct work; 45 #ifdef CONFIG_LEDS_PCA9532_GPIO 46 struct gpio_chip gpio; 47 #endif 48 const struct pca9532_chip_info *chip_info; 49 u8 pwm[2]; 50 u8 psc[2]; 51 }; 52 53 static int pca9532_probe(struct i2c_client *client, 54 const struct i2c_device_id *id); 55 static int pca9532_remove(struct i2c_client *client); 56 57 enum { 58 pca9530, 59 pca9531, 60 pca9532, 61 pca9533, 62 }; 63 64 static const struct i2c_device_id pca9532_id[] = { 65 { "pca9530", pca9530 }, 66 { "pca9531", pca9531 }, 67 { "pca9532", pca9532 }, 68 { "pca9533", pca9533 }, 69 { } 70 }; 71 72 MODULE_DEVICE_TABLE(i2c, pca9532_id); 73 74 static const struct pca9532_chip_info pca9532_chip_info_tbl[] = { 75 [pca9530] = { 76 .num_leds = 2, 77 }, 78 [pca9531] = { 79 .num_leds = 8, 80 }, 81 [pca9532] = { 82 .num_leds = 16, 83 }, 84 [pca9533] = { 85 .num_leds = 4, 86 }, 87 }; 88 89 static struct i2c_driver pca9532_driver = { 90 .driver = { 91 .name = "leds-pca953x", 92 }, 93 .probe = pca9532_probe, 94 .remove = pca9532_remove, 95 .id_table = pca9532_id, 96 }; 97 98 /* We have two pwm/blinkers, but 16 possible leds to drive. Additionally, 99 * the clever Thecus people are using one pwm to drive the beeper. So, 100 * as a compromise we average one pwm to the values requested by all 101 * leds that are not ON/OFF. 102 * */ 103 static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink, 104 enum led_brightness value) 105 { 106 int a = 0, b = 0, i = 0; 107 struct pca9532_data *data = i2c_get_clientdata(client); 108 for (i = 0; i < data->chip_info->num_leds; i++) { 109 if (data->leds[i].type == PCA9532_TYPE_LED && 110 data->leds[i].state == PCA9532_PWM0+pwm) { 111 a++; 112 b += data->leds[i].ldev.brightness; 113 } 114 } 115 if (a == 0) { 116 dev_err(&client->dev, 117 "fear of division by zero %d/%d, wanted %d\n", 118 b, a, value); 119 return -EINVAL; 120 } 121 b = b/a; 122 if (b > 0xFF) 123 return -EINVAL; 124 data->pwm[pwm] = b; 125 data->psc[pwm] = blink; 126 return 0; 127 } 128 129 static int pca9532_setpwm(struct i2c_client *client, int pwm) 130 { 131 struct pca9532_data *data = i2c_get_clientdata(client); 132 u8 maxleds = data->chip_info->num_leds; 133 134 mutex_lock(&data->update_lock); 135 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, pwm), 136 data->pwm[pwm]); 137 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, pwm), 138 data->psc[pwm]); 139 mutex_unlock(&data->update_lock); 140 return 0; 141 } 142 143 /* Set LED routing */ 144 static void pca9532_setled(struct pca9532_led *led) 145 { 146 struct i2c_client *client = led->client; 147 struct pca9532_data *data = i2c_get_clientdata(client); 148 u8 maxleds = data->chip_info->num_leds; 149 char reg; 150 151 mutex_lock(&data->update_lock); 152 reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id)); 153 /* zero led bits */ 154 reg = reg & ~(0x3<<LED_NUM(led->id)*2); 155 /* set the new value */ 156 reg = reg | (led->state << LED_NUM(led->id)*2); 157 i2c_smbus_write_byte_data(client, LED_REG(maxleds, led->id), reg); 158 mutex_unlock(&data->update_lock); 159 } 160 161 static void pca9532_set_brightness(struct led_classdev *led_cdev, 162 enum led_brightness value) 163 { 164 int err = 0; 165 struct pca9532_led *led = ldev_to_led(led_cdev); 166 167 if (value == LED_OFF) 168 led->state = PCA9532_OFF; 169 else if (value == LED_FULL) 170 led->state = PCA9532_ON; 171 else { 172 led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */ 173 err = pca9532_calcpwm(led->client, 0, 0, value); 174 if (err) 175 return; /* XXX: led api doesn't allow error code? */ 176 } 177 schedule_work(&led->work); 178 } 179 180 static int pca9532_set_blink(struct led_classdev *led_cdev, 181 unsigned long *delay_on, unsigned long *delay_off) 182 { 183 struct pca9532_led *led = ldev_to_led(led_cdev); 184 struct i2c_client *client = led->client; 185 int psc; 186 int err = 0; 187 188 if (*delay_on == 0 && *delay_off == 0) { 189 /* led subsystem ask us for a blink rate */ 190 *delay_on = 1000; 191 *delay_off = 1000; 192 } 193 if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6) 194 return -EINVAL; 195 196 /* Thecus specific: only use PSC/PWM 0 */ 197 psc = (*delay_on * 152-1)/1000; 198 err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness); 199 if (err) 200 return err; 201 schedule_work(&led->work); 202 return 0; 203 } 204 205 static int pca9532_event(struct input_dev *dev, unsigned int type, 206 unsigned int code, int value) 207 { 208 struct pca9532_data *data = input_get_drvdata(dev); 209 210 if (!(type == EV_SND && (code == SND_BELL || code == SND_TONE))) 211 return -1; 212 213 /* XXX: allow different kind of beeps with psc/pwm modifications */ 214 if (value > 1 && value < 32767) 215 data->pwm[1] = 127; 216 else 217 data->pwm[1] = 0; 218 219 schedule_work(&data->work); 220 221 return 0; 222 } 223 224 static void pca9532_input_work(struct work_struct *work) 225 { 226 struct pca9532_data *data = 227 container_of(work, struct pca9532_data, work); 228 u8 maxleds = data->chip_info->num_leds; 229 230 mutex_lock(&data->update_lock); 231 i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(maxleds, 1), 232 data->pwm[1]); 233 mutex_unlock(&data->update_lock); 234 } 235 236 static void pca9532_led_work(struct work_struct *work) 237 { 238 struct pca9532_led *led; 239 led = container_of(work, struct pca9532_led, work); 240 if (led->state == PCA9532_PWM0) 241 pca9532_setpwm(led->client, 0); 242 pca9532_setled(led); 243 } 244 245 #ifdef CONFIG_LEDS_PCA9532_GPIO 246 static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset) 247 { 248 struct pca9532_data *data = container_of(gc, struct pca9532_data, gpio); 249 struct pca9532_led *led = &data->leds[offset]; 250 251 if (led->type == PCA9532_TYPE_GPIO) 252 return 0; 253 254 return -EBUSY; 255 } 256 257 static void pca9532_gpio_set_value(struct gpio_chip *gc, unsigned offset, int val) 258 { 259 struct pca9532_data *data = container_of(gc, struct pca9532_data, gpio); 260 struct pca9532_led *led = &data->leds[offset]; 261 262 if (val) 263 led->state = PCA9532_ON; 264 else 265 led->state = PCA9532_OFF; 266 267 pca9532_setled(led); 268 } 269 270 static int pca9532_gpio_get_value(struct gpio_chip *gc, unsigned offset) 271 { 272 struct pca9532_data *data = container_of(gc, struct pca9532_data, gpio); 273 unsigned char reg; 274 275 reg = i2c_smbus_read_byte_data(data->client, PCA9532_REG_INPUT(offset)); 276 277 return !!(reg & (1 << (offset % 8))); 278 } 279 280 static int pca9532_gpio_direction_input(struct gpio_chip *gc, unsigned offset) 281 { 282 /* To use as input ensure pin is not driven */ 283 pca9532_gpio_set_value(gc, offset, 0); 284 285 return 0; 286 } 287 288 static int pca9532_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int val) 289 { 290 pca9532_gpio_set_value(gc, offset, val); 291 292 return 0; 293 } 294 #endif /* CONFIG_LEDS_PCA9532_GPIO */ 295 296 static int pca9532_destroy_devices(struct pca9532_data *data, int n_devs) 297 { 298 int i = n_devs; 299 300 if (!data) 301 return -EINVAL; 302 303 while (--i >= 0) { 304 switch (data->leds[i].type) { 305 case PCA9532_TYPE_NONE: 306 case PCA9532_TYPE_GPIO: 307 break; 308 case PCA9532_TYPE_LED: 309 led_classdev_unregister(&data->leds[i].ldev); 310 cancel_work_sync(&data->leds[i].work); 311 break; 312 case PCA9532_TYPE_N2100_BEEP: 313 if (data->idev != NULL) { 314 cancel_work_sync(&data->work); 315 data->idev = NULL; 316 } 317 break; 318 } 319 } 320 321 #ifdef CONFIG_LEDS_PCA9532_GPIO 322 if (data->gpio.dev) 323 gpiochip_remove(&data->gpio); 324 #endif 325 326 return 0; 327 } 328 329 static int pca9532_configure(struct i2c_client *client, 330 struct pca9532_data *data, struct pca9532_platform_data *pdata) 331 { 332 int i, err = 0; 333 int gpios = 0; 334 u8 maxleds = data->chip_info->num_leds; 335 336 for (i = 0; i < 2; i++) { 337 data->pwm[i] = pdata->pwm[i]; 338 data->psc[i] = pdata->psc[i]; 339 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, i), 340 data->pwm[i]); 341 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, i), 342 data->psc[i]); 343 } 344 345 for (i = 0; i < data->chip_info->num_leds; i++) { 346 struct pca9532_led *led = &data->leds[i]; 347 struct pca9532_led *pled = &pdata->leds[i]; 348 led->client = client; 349 led->id = i; 350 led->type = pled->type; 351 switch (led->type) { 352 case PCA9532_TYPE_NONE: 353 break; 354 case PCA9532_TYPE_GPIO: 355 gpios++; 356 break; 357 case PCA9532_TYPE_LED: 358 led->state = pled->state; 359 led->name = pled->name; 360 led->ldev.name = led->name; 361 led->ldev.brightness = LED_OFF; 362 led->ldev.brightness_set = pca9532_set_brightness; 363 led->ldev.blink_set = pca9532_set_blink; 364 INIT_WORK(&led->work, pca9532_led_work); 365 err = led_classdev_register(&client->dev, &led->ldev); 366 if (err < 0) { 367 dev_err(&client->dev, 368 "couldn't register LED %s\n", 369 led->name); 370 goto exit; 371 } 372 pca9532_setled(led); 373 break; 374 case PCA9532_TYPE_N2100_BEEP: 375 BUG_ON(data->idev); 376 led->state = PCA9532_PWM1; 377 pca9532_setled(led); 378 data->idev = devm_input_allocate_device(&client->dev); 379 if (data->idev == NULL) { 380 err = -ENOMEM; 381 goto exit; 382 } 383 data->idev->name = pled->name; 384 data->idev->phys = "i2c/pca9532"; 385 data->idev->id.bustype = BUS_HOST; 386 data->idev->id.vendor = 0x001f; 387 data->idev->id.product = 0x0001; 388 data->idev->id.version = 0x0100; 389 data->idev->evbit[0] = BIT_MASK(EV_SND); 390 data->idev->sndbit[0] = BIT_MASK(SND_BELL) | 391 BIT_MASK(SND_TONE); 392 data->idev->event = pca9532_event; 393 input_set_drvdata(data->idev, data); 394 INIT_WORK(&data->work, pca9532_input_work); 395 err = input_register_device(data->idev); 396 if (err) { 397 cancel_work_sync(&data->work); 398 data->idev = NULL; 399 goto exit; 400 } 401 break; 402 } 403 } 404 405 #ifdef CONFIG_LEDS_PCA9532_GPIO 406 if (gpios) { 407 data->gpio.label = "gpio-pca9532"; 408 data->gpio.direction_input = pca9532_gpio_direction_input; 409 data->gpio.direction_output = pca9532_gpio_direction_output; 410 data->gpio.set = pca9532_gpio_set_value; 411 data->gpio.get = pca9532_gpio_get_value; 412 data->gpio.request = pca9532_gpio_request_pin; 413 data->gpio.can_sleep = 1; 414 data->gpio.base = pdata->gpio_base; 415 data->gpio.ngpio = data->chip_info->num_leds; 416 data->gpio.dev = &client->dev; 417 data->gpio.owner = THIS_MODULE; 418 419 err = gpiochip_add(&data->gpio); 420 if (err) { 421 /* Use data->gpio.dev as a flag for freeing gpiochip */ 422 data->gpio.dev = NULL; 423 dev_warn(&client->dev, "could not add gpiochip\n"); 424 } else { 425 dev_info(&client->dev, "gpios %i...%i\n", 426 data->gpio.base, data->gpio.base + 427 data->gpio.ngpio - 1); 428 } 429 } 430 #endif 431 432 return 0; 433 434 exit: 435 pca9532_destroy_devices(data, i); 436 return err; 437 } 438 439 static int pca9532_probe(struct i2c_client *client, 440 const struct i2c_device_id *id) 441 { 442 struct pca9532_data *data = i2c_get_clientdata(client); 443 struct pca9532_platform_data *pca9532_pdata = 444 dev_get_platdata(&client->dev); 445 446 if (!pca9532_pdata) 447 return -EIO; 448 449 if (!i2c_check_functionality(client->adapter, 450 I2C_FUNC_SMBUS_BYTE_DATA)) 451 return -EIO; 452 453 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); 454 if (!data) 455 return -ENOMEM; 456 457 data->chip_info = &pca9532_chip_info_tbl[id->driver_data]; 458 459 dev_info(&client->dev, "setting platform data\n"); 460 i2c_set_clientdata(client, data); 461 data->client = client; 462 mutex_init(&data->update_lock); 463 464 return pca9532_configure(client, data, pca9532_pdata); 465 } 466 467 static int pca9532_remove(struct i2c_client *client) 468 { 469 struct pca9532_data *data = i2c_get_clientdata(client); 470 int err; 471 472 err = pca9532_destroy_devices(data, data->chip_info->num_leds); 473 if (err) 474 return err; 475 476 return 0; 477 } 478 479 module_i2c_driver(pca9532_driver); 480 481 MODULE_AUTHOR("Riku Voipio"); 482 MODULE_LICENSE("GPL"); 483 MODULE_DESCRIPTION("PCA 9532 LED dimmer"); 484