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 int 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 err; 176 } 177 if (led->state == PCA9532_PWM0) 178 pca9532_setpwm(led->client, 0); 179 pca9532_setled(led); 180 return err; 181 } 182 183 static int pca9532_set_blink(struct led_classdev *led_cdev, 184 unsigned long *delay_on, unsigned long *delay_off) 185 { 186 struct pca9532_led *led = ldev_to_led(led_cdev); 187 struct i2c_client *client = led->client; 188 int psc; 189 int err = 0; 190 191 if (*delay_on == 0 && *delay_off == 0) { 192 /* led subsystem ask us for a blink rate */ 193 *delay_on = 1000; 194 *delay_off = 1000; 195 } 196 if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6) 197 return -EINVAL; 198 199 /* Thecus specific: only use PSC/PWM 0 */ 200 psc = (*delay_on * 152-1)/1000; 201 err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness); 202 if (err) 203 return err; 204 if (led->state == PCA9532_PWM0) 205 pca9532_setpwm(led->client, 0); 206 pca9532_setled(led); 207 208 return 0; 209 } 210 211 static int pca9532_event(struct input_dev *dev, unsigned int type, 212 unsigned int code, int value) 213 { 214 struct pca9532_data *data = input_get_drvdata(dev); 215 216 if (!(type == EV_SND && (code == SND_BELL || code == SND_TONE))) 217 return -1; 218 219 /* XXX: allow different kind of beeps with psc/pwm modifications */ 220 if (value > 1 && value < 32767) 221 data->pwm[1] = 127; 222 else 223 data->pwm[1] = 0; 224 225 schedule_work(&data->work); 226 227 return 0; 228 } 229 230 static void pca9532_input_work(struct work_struct *work) 231 { 232 struct pca9532_data *data = 233 container_of(work, struct pca9532_data, work); 234 u8 maxleds = data->chip_info->num_leds; 235 236 mutex_lock(&data->update_lock); 237 i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(maxleds, 1), 238 data->pwm[1]); 239 mutex_unlock(&data->update_lock); 240 } 241 242 #ifdef CONFIG_LEDS_PCA9532_GPIO 243 static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset) 244 { 245 struct pca9532_data *data = gpiochip_get_data(gc); 246 struct pca9532_led *led = &data->leds[offset]; 247 248 if (led->type == PCA9532_TYPE_GPIO) 249 return 0; 250 251 return -EBUSY; 252 } 253 254 static void pca9532_gpio_set_value(struct gpio_chip *gc, unsigned offset, int val) 255 { 256 struct pca9532_data *data = gpiochip_get_data(gc); 257 struct pca9532_led *led = &data->leds[offset]; 258 259 if (val) 260 led->state = PCA9532_ON; 261 else 262 led->state = PCA9532_OFF; 263 264 pca9532_setled(led); 265 } 266 267 static int pca9532_gpio_get_value(struct gpio_chip *gc, unsigned offset) 268 { 269 struct pca9532_data *data = gpiochip_get_data(gc); 270 unsigned char reg; 271 272 reg = i2c_smbus_read_byte_data(data->client, PCA9532_REG_INPUT(offset)); 273 274 return !!(reg & (1 << (offset % 8))); 275 } 276 277 static int pca9532_gpio_direction_input(struct gpio_chip *gc, unsigned offset) 278 { 279 /* To use as input ensure pin is not driven */ 280 pca9532_gpio_set_value(gc, offset, 0); 281 282 return 0; 283 } 284 285 static int pca9532_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int val) 286 { 287 pca9532_gpio_set_value(gc, offset, val); 288 289 return 0; 290 } 291 #endif /* CONFIG_LEDS_PCA9532_GPIO */ 292 293 static int pca9532_destroy_devices(struct pca9532_data *data, int n_devs) 294 { 295 int i = n_devs; 296 297 if (!data) 298 return -EINVAL; 299 300 while (--i >= 0) { 301 switch (data->leds[i].type) { 302 case PCA9532_TYPE_NONE: 303 case PCA9532_TYPE_GPIO: 304 break; 305 case PCA9532_TYPE_LED: 306 led_classdev_unregister(&data->leds[i].ldev); 307 break; 308 case PCA9532_TYPE_N2100_BEEP: 309 if (data->idev != NULL) { 310 cancel_work_sync(&data->work); 311 data->idev = NULL; 312 } 313 break; 314 } 315 } 316 317 #ifdef CONFIG_LEDS_PCA9532_GPIO 318 if (data->gpio.parent) 319 gpiochip_remove(&data->gpio); 320 #endif 321 322 return 0; 323 } 324 325 static int pca9532_configure(struct i2c_client *client, 326 struct pca9532_data *data, struct pca9532_platform_data *pdata) 327 { 328 int i, err = 0; 329 int gpios = 0; 330 u8 maxleds = data->chip_info->num_leds; 331 332 for (i = 0; i < 2; i++) { 333 data->pwm[i] = pdata->pwm[i]; 334 data->psc[i] = pdata->psc[i]; 335 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, i), 336 data->pwm[i]); 337 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, i), 338 data->psc[i]); 339 } 340 341 for (i = 0; i < data->chip_info->num_leds; i++) { 342 struct pca9532_led *led = &data->leds[i]; 343 struct pca9532_led *pled = &pdata->leds[i]; 344 led->client = client; 345 led->id = i; 346 led->type = pled->type; 347 switch (led->type) { 348 case PCA9532_TYPE_NONE: 349 break; 350 case PCA9532_TYPE_GPIO: 351 gpios++; 352 break; 353 case PCA9532_TYPE_LED: 354 led->state = pled->state; 355 led->name = pled->name; 356 led->ldev.name = led->name; 357 led->ldev.brightness = LED_OFF; 358 led->ldev.brightness_set_blocking = 359 pca9532_set_brightness; 360 led->ldev.blink_set = pca9532_set_blink; 361 err = led_classdev_register(&client->dev, &led->ldev); 362 if (err < 0) { 363 dev_err(&client->dev, 364 "couldn't register LED %s\n", 365 led->name); 366 goto exit; 367 } 368 pca9532_setled(led); 369 break; 370 case PCA9532_TYPE_N2100_BEEP: 371 BUG_ON(data->idev); 372 led->state = PCA9532_PWM1; 373 pca9532_setled(led); 374 data->idev = devm_input_allocate_device(&client->dev); 375 if (data->idev == NULL) { 376 err = -ENOMEM; 377 goto exit; 378 } 379 data->idev->name = pled->name; 380 data->idev->phys = "i2c/pca9532"; 381 data->idev->id.bustype = BUS_HOST; 382 data->idev->id.vendor = 0x001f; 383 data->idev->id.product = 0x0001; 384 data->idev->id.version = 0x0100; 385 data->idev->evbit[0] = BIT_MASK(EV_SND); 386 data->idev->sndbit[0] = BIT_MASK(SND_BELL) | 387 BIT_MASK(SND_TONE); 388 data->idev->event = pca9532_event; 389 input_set_drvdata(data->idev, data); 390 INIT_WORK(&data->work, pca9532_input_work); 391 err = input_register_device(data->idev); 392 if (err) { 393 cancel_work_sync(&data->work); 394 data->idev = NULL; 395 goto exit; 396 } 397 break; 398 } 399 } 400 401 #ifdef CONFIG_LEDS_PCA9532_GPIO 402 if (gpios) { 403 data->gpio.label = "gpio-pca9532"; 404 data->gpio.direction_input = pca9532_gpio_direction_input; 405 data->gpio.direction_output = pca9532_gpio_direction_output; 406 data->gpio.set = pca9532_gpio_set_value; 407 data->gpio.get = pca9532_gpio_get_value; 408 data->gpio.request = pca9532_gpio_request_pin; 409 data->gpio.can_sleep = 1; 410 data->gpio.base = pdata->gpio_base; 411 data->gpio.ngpio = data->chip_info->num_leds; 412 data->gpio.parent = &client->dev; 413 data->gpio.owner = THIS_MODULE; 414 415 err = gpiochip_add_data(&data->gpio, data); 416 if (err) { 417 /* Use data->gpio.dev as a flag for freeing gpiochip */ 418 data->gpio.parent = NULL; 419 dev_warn(&client->dev, "could not add gpiochip\n"); 420 } else { 421 dev_info(&client->dev, "gpios %i...%i\n", 422 data->gpio.base, data->gpio.base + 423 data->gpio.ngpio - 1); 424 } 425 } 426 #endif 427 428 return 0; 429 430 exit: 431 pca9532_destroy_devices(data, i); 432 return err; 433 } 434 435 static int pca9532_probe(struct i2c_client *client, 436 const struct i2c_device_id *id) 437 { 438 struct pca9532_data *data = i2c_get_clientdata(client); 439 struct pca9532_platform_data *pca9532_pdata = 440 dev_get_platdata(&client->dev); 441 442 if (!pca9532_pdata) 443 return -EIO; 444 445 if (!i2c_check_functionality(client->adapter, 446 I2C_FUNC_SMBUS_BYTE_DATA)) 447 return -EIO; 448 449 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); 450 if (!data) 451 return -ENOMEM; 452 453 data->chip_info = &pca9532_chip_info_tbl[id->driver_data]; 454 455 dev_info(&client->dev, "setting platform data\n"); 456 i2c_set_clientdata(client, data); 457 data->client = client; 458 mutex_init(&data->update_lock); 459 460 return pca9532_configure(client, data, pca9532_pdata); 461 } 462 463 static int pca9532_remove(struct i2c_client *client) 464 { 465 struct pca9532_data *data = i2c_get_clientdata(client); 466 int err; 467 468 err = pca9532_destroy_devices(data, data->chip_info->num_leds); 469 if (err) 470 return err; 471 472 return 0; 473 } 474 475 module_i2c_driver(pca9532_driver); 476 477 MODULE_AUTHOR("Riku Voipio"); 478 MODULE_LICENSE("GPL"); 479 MODULE_DESCRIPTION("PCA 9532 LED dimmer"); 480