1/* 2 * pca9532.c - 16-bit Led dimmer 3 * 4 * Copyright (C) 2008 Riku Voipio 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; version 2 of the License. 9 * 10 * Datasheet: http://www.nxp.com/acrobat/datasheets/PCA9532_3.pdf 11 * 12 */ 13 14#include <linux/module.h> 15#include <linux/i2c.h> 16#include <linux/slab.h> 17#include <linux/leds.h> 18#include <linux/input.h> 19#include <linux/mutex.h> 20#include <linux/workqueue.h> 21#include <linux/leds-pca9532.h> 22 23#define PCA9532_REG_PSC(i) (0x2+(i)*2) 24#define PCA9532_REG_PWM(i) (0x3+(i)*2) 25#define PCA9532_REG_LS0 0x6 26#define LED_REG(led) ((led>>2)+PCA9532_REG_LS0) 27#define LED_NUM(led) (led & 0x3) 28 29#define ldev_to_led(c) container_of(c, struct pca9532_led, ldev) 30 31struct pca9532_data { 32 struct i2c_client *client; 33 struct pca9532_led leds[16]; 34 struct mutex update_lock; 35 struct input_dev *idev; 36 struct work_struct work; 37 u8 pwm[2]; 38 u8 psc[2]; 39}; 40 41static int pca9532_probe(struct i2c_client *client, 42 const struct i2c_device_id *id); 43static int pca9532_remove(struct i2c_client *client); 44 45static const struct i2c_device_id pca9532_id[] = { 46 { "pca9532", 0 }, 47 { } 48}; 49 50MODULE_DEVICE_TABLE(i2c, pca9532_id); 51 52static struct i2c_driver pca9532_driver = { 53 .driver = { 54 .name = "pca9532", 55 }, 56 .probe = pca9532_probe, 57 .remove = pca9532_remove, 58 .id_table = pca9532_id, 59}; 60 61/* We have two pwm/blinkers, but 16 possible leds to drive. Additionaly, 62 * the clever Thecus people are using one pwm to drive the beeper. So, 63 * as a compromise we average one pwm to the values requested by all 64 * leds that are not ON/OFF. 65 * */ 66static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink, 67 enum led_brightness value) 68{ 69 int a = 0, b = 0, i = 0; 70 struct pca9532_data *data = i2c_get_clientdata(client); 71 for (i = 0; i < 16; i++) { 72 if (data->leds[i].type == PCA9532_TYPE_LED && 73 data->leds[i].state == PCA9532_PWM0+pwm) { 74 a++; 75 b += data->leds[i].ldev.brightness; 76 } 77 } 78 if (a == 0) { 79 dev_err(&client->dev, 80 "fear of division by zero %d/%d, wanted %d\n", 81 b, a, value); 82 return -EINVAL; 83 } 84 b = b/a; 85 if (b > 0xFF) 86 return -EINVAL; 87 data->pwm[pwm] = b; 88 data->psc[pwm] = blink; 89 return 0; 90} 91 92static int pca9532_setpwm(struct i2c_client *client, int pwm) 93{ 94 struct pca9532_data *data = i2c_get_clientdata(client); 95 mutex_lock(&data->update_lock); 96 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(pwm), 97 data->pwm[pwm]); 98 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(pwm), 99 data->psc[pwm]); 100 mutex_unlock(&data->update_lock); 101 return 0; 102} 103 104/* Set LED routing */ 105static void pca9532_setled(struct pca9532_led *led) 106{ 107 struct i2c_client *client = led->client; 108 struct pca9532_data *data = i2c_get_clientdata(client); 109 char reg; 110 111 mutex_lock(&data->update_lock); 112 reg = i2c_smbus_read_byte_data(client, LED_REG(led->id)); 113 /* zero led bits */ 114 reg = reg & ~(0x3<<LED_NUM(led->id)*2); 115 /* set the new value */ 116 reg = reg | (led->state << LED_NUM(led->id)*2); 117 i2c_smbus_write_byte_data(client, LED_REG(led->id), reg); 118 mutex_unlock(&data->update_lock); 119} 120 121static void pca9532_set_brightness(struct led_classdev *led_cdev, 122 enum led_brightness value) 123{ 124 int err = 0; 125 struct pca9532_led *led = ldev_to_led(led_cdev); 126 127 if (value == LED_OFF) 128 led->state = PCA9532_OFF; 129 else if (value == LED_FULL) 130 led->state = PCA9532_ON; 131 else { 132 led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */ 133 err = pca9532_calcpwm(led->client, 0, 0, value); 134 if (err) 135 return; 136 } 137 schedule_work(&led->work); 138} 139 140static int pca9532_set_blink(struct led_classdev *led_cdev, 141 unsigned long *delay_on, unsigned long *delay_off) 142{ 143 struct pca9532_led *led = ldev_to_led(led_cdev); 144 struct i2c_client *client = led->client; 145 int psc; 146 int err = 0; 147 148 if (*delay_on == 0 && *delay_off == 0) { 149 /* led subsystem ask us for a blink rate */ 150 *delay_on = 1000; 151 *delay_off = 1000; 152 } 153 if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6) 154 return -EINVAL; 155 156 /* Thecus specific: only use PSC/PWM 0 */ 157 psc = (*delay_on * 152-1)/1000; 158 err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness); 159 if (err) 160 return err; 161 schedule_work(&led->work); 162 return 0; 163} 164 165static int pca9532_event(struct input_dev *dev, unsigned int type, 166 unsigned int code, int value) 167{ 168 struct pca9532_data *data = input_get_drvdata(dev); 169 170 if (!(type == EV_SND && (code == SND_BELL || code == SND_TONE))) 171 return -1; 172 173 if (value > 1 && value < 32767) 174 data->pwm[1] = 127; 175 else 176 data->pwm[1] = 0; 177 178 schedule_work(&data->work); 179 180 return 0; 181} 182 183static void pca9532_input_work(struct work_struct *work) 184{ 185 struct pca9532_data *data; 186 data = container_of(work, struct pca9532_data, work); 187 mutex_lock(&data->update_lock); 188 i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(1), 189 data->pwm[1]); 190 mutex_unlock(&data->update_lock); 191} 192 193static void pca9532_led_work(struct work_struct *work) 194{ 195 struct pca9532_led *led; 196 led = container_of(work, struct pca9532_led, work); 197 if (led->state == PCA9532_PWM0) 198 pca9532_setpwm(led->client, 0); 199 pca9532_setled(led); 200} 201 202static int pca9532_configure(struct i2c_client *client, 203 struct pca9532_data *data, struct pca9532_platform_data *pdata) 204{ 205 int i, err = 0; 206 207 for (i = 0; i < 2; i++) { 208 data->pwm[i] = pdata->pwm[i]; 209 data->psc[i] = pdata->psc[i]; 210 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(i), 211 data->pwm[i]); 212 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(i), 213 data->psc[i]); 214 } 215 216 for (i = 0; i < 16; i++) { 217 struct pca9532_led *led = &data->leds[i]; 218 struct pca9532_led *pled = &pdata->leds[i]; 219 led->client = client; 220 led->id = i; 221 led->type = pled->type; 222 switch (led->type) { 223 case PCA9532_TYPE_NONE: 224 break; 225 case PCA9532_TYPE_LED: 226 led->state = pled->state; 227 led->name = pled->name; 228 led->ldev.name = led->name; 229 led->ldev.brightness = LED_OFF; 230 led->ldev.brightness_set = pca9532_set_brightness; 231 led->ldev.blink_set = pca9532_set_blink; 232 INIT_WORK(&led->work, pca9532_led_work); 233 err = led_classdev_register(&client->dev, &led->ldev); 234 if (err < 0) { 235 dev_err(&client->dev, 236 "couldn't register LED %s\n", 237 led->name); 238 goto exit; 239 } 240 pca9532_setled(led); 241 break; 242 case PCA9532_TYPE_N2100_BEEP: 243 BUG_ON(data->idev); 244 led->state = PCA9532_PWM1; 245 pca9532_setled(led); 246 data->idev = input_allocate_device(); 247 if (data->idev == NULL) { 248 err = -ENOMEM; 249 goto exit; 250 } 251 data->idev->name = pled->name; 252 data->idev->phys = "i2c/pca9532"; 253 data->idev->id.bustype = BUS_HOST; 254 data->idev->id.vendor = 0x001f; 255 data->idev->id.product = 0x0001; 256 data->idev->id.version = 0x0100; 257 data->idev->evbit[0] = BIT_MASK(EV_SND); 258 data->idev->sndbit[0] = BIT_MASK(SND_BELL) | 259 BIT_MASK(SND_TONE); 260 data->idev->event = pca9532_event; 261 input_set_drvdata(data->idev, data); 262 INIT_WORK(&data->work, pca9532_input_work); 263 err = input_register_device(data->idev); 264 if (err) { 265 input_free_device(data->idev); 266 cancel_work_sync(&data->work); 267 data->idev = NULL; 268 goto exit; 269 } 270 break; 271 } 272 } 273 return 0; 274 275exit: 276 if (i > 0) 277 for (i = i - 1; i >= 0; i--) 278 switch (data->leds[i].type) { 279 case PCA9532_TYPE_NONE: 280 break; 281 case PCA9532_TYPE_LED: 282 led_classdev_unregister(&data->leds[i].ldev); 283 cancel_work_sync(&data->leds[i].work); 284 break; 285 case PCA9532_TYPE_N2100_BEEP: 286 if (data->idev != NULL) { 287 input_unregister_device(data->idev); 288 input_free_device(data->idev); 289 cancel_work_sync(&data->work); 290 data->idev = NULL; 291 } 292 break; 293 } 294 295 return err; 296} 297 298static int pca9532_probe(struct i2c_client *client, 299 const struct i2c_device_id *id) 300{ 301 struct pca9532_data *data = i2c_get_clientdata(client); 302 struct pca9532_platform_data *pca9532_pdata = client->dev.platform_data; 303 int err; 304 305 if (!pca9532_pdata) 306 return -EIO; 307 308 if (!i2c_check_functionality(client->adapter, 309 I2C_FUNC_SMBUS_BYTE_DATA)) 310 return -EIO; 311 312 data = kzalloc(sizeof(*data), GFP_KERNEL); 313 if (!data) 314 return -ENOMEM; 315 316 dev_info(&client->dev, "setting platform data\n"); 317 i2c_set_clientdata(client, data); 318 data->client = client; 319 mutex_init(&data->update_lock); 320 321 err = pca9532_configure(client, data, pca9532_pdata); 322 if (err) 323 kfree(data); 324 325 return err; 326} 327 328static int pca9532_remove(struct i2c_client *client) 329{ 330 struct pca9532_data *data = i2c_get_clientdata(client); 331 int i; 332 for (i = 0; i < 16; i++) 333 switch (data->leds[i].type) { 334 case PCA9532_TYPE_NONE: 335 break; 336 case PCA9532_TYPE_LED: 337 led_classdev_unregister(&data->leds[i].ldev); 338 cancel_work_sync(&data->leds[i].work); 339 break; 340 case PCA9532_TYPE_N2100_BEEP: 341 if (data->idev != NULL) { 342 input_unregister_device(data->idev); 343 input_free_device(data->idev); 344 cancel_work_sync(&data->work); 345 data->idev = NULL; 346 } 347 break; 348 } 349 350 kfree(data); 351 return 0; 352} 353 354static int __init pca9532_init(void) 355{ 356 return i2c_add_driver(&pca9532_driver); 357} 358 359static void __exit pca9532_exit(void) 360{ 361 i2c_del_driver(&pca9532_driver); 362} 363 364MODULE_AUTHOR("Riku Voipio"); 365MODULE_LICENSE("GPL"); 366MODULE_DESCRIPTION("PCA 9532 LED dimmer"); 367 368module_init(pca9532_init); 369module_exit(pca9532_exit); 370