drivers/hwmon/ltc4245.c

   1 /*
   2  * Driver for Linear Technology LTC4245 I2C Multiple Supply Hot Swap Controller
   3  *
   4  * Copyright (C) 2008 Ira W. Snyder <iws@ovro.caltech.edu>
   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  * This driver is based on the ds1621 and ina209 drivers.
  11  *
  12  * Datasheet:
  13  * http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1006,C1140,P19392,D13517
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/err.h>
  20 #include <linux/slab.h>
  21 #include <linux/i2c.h>
  22 #include <linux/hwmon.h>
  23 #include <linux/hwmon-sysfs.h>
  24 #include <linux/jiffies.h>
  25 #include <linux/i2c/ltc4245.h>
  26
  27 /* Here are names of the chip's registers (a.k.a. commands) */
  28 enum ltc4245_cmd {
  29         LTC4245_STATUS                  = 0x00, /* readonly */
  30         LTC4245_ALERT                   = 0x01,
  31         LTC4245_CONTROL                 = 0x02,
  32         LTC4245_ON                      = 0x03,
  33         LTC4245_FAULT1                  = 0x04,
  34         LTC4245_FAULT2                  = 0x05,
  35         LTC4245_GPIO                    = 0x06,
  36         LTC4245_ADCADR                  = 0x07,
  37
  38         LTC4245_12VIN                   = 0x10,
  39         LTC4245_12VSENSE                = 0x11,
  40         LTC4245_12VOUT                  = 0x12,
  41         LTC4245_5VIN                    = 0x13,
  42         LTC4245_5VSENSE                 = 0x14,
  43         LTC4245_5VOUT                   = 0x15,
  44         LTC4245_3VIN                    = 0x16,
  45         LTC4245_3VSENSE                 = 0x17,
  46         LTC4245_3VOUT                   = 0x18,
  47         LTC4245_VEEIN                   = 0x19,
  48         LTC4245_VEESENSE                = 0x1a,
  49         LTC4245_VEEOUT                  = 0x1b,
  50         LTC4245_GPIOADC                 = 0x1c,
  51 };
  52
  53 struct ltc4245_data {
  54         struct i2c_client *client;
  55
  56         const struct attribute_group *groups[3];
  57
  58         struct mutex update_lock;
  59         bool valid;
  60         unsigned long last_updated; /* in jiffies */
  61
  62         /* Control registers */
  63         u8 cregs[0x08];
  64
  65         /* Voltage registers */
  66         u8 vregs[0x0d];
  67
  68         /* GPIO ADC registers */
  69         bool use_extra_gpios;
  70         int gpios[3];
  71 };
  72
  73 /*
  74  * Update the readings from the GPIO pins. If the driver has been configured to
  75  * sample all GPIO's as analog voltages, a round-robin sampling method is used.
  76  * Otherwise, only the configured GPIO pin is sampled.
  77  *
  78  * LOCKING: must hold data->update_lock
  79  */
  80 static void ltc4245_update_gpios(struct device *dev)
  81 {
  82         struct ltc4245_data *data = dev_get_drvdata(dev);
  83         struct i2c_client *client = data->client;
  84         u8 gpio_curr, gpio_next, gpio_reg;
  85         int i;
  86
  87         /* no extra gpio support, we're basically done */
  88         if (!data->use_extra_gpios) {
  89                 data->gpios[0] = data->vregs[LTC4245_GPIOADC - 0x10];
  90                 return;
  91         }
  92
  93         /*
  94          * If the last reading was too long ago, then we mark all old GPIO
  95          * readings as stale by setting them to -EAGAIN
  96          */
  97         if (time_after(jiffies, data->last_updated + 5 * HZ)) {
  98                 dev_dbg(&client->dev, "Marking GPIOs invalid\n");
  99                 for (i = 0; i < ARRAY_SIZE(data->gpios); i++)
 100                         data->gpios[i] = -EAGAIN;
 101         }
 102
 103         /*
 104          * Get the current GPIO pin
 105          *
 106          * The datasheet calls these GPIO[1-3], but we'll calculate the zero
 107          * based array index instead, and call them GPIO[0-2]. This is much
 108          * easier to think about.
 109          */
 110         gpio_curr = (data->cregs[LTC4245_GPIO] & 0xc0) >> 6;
 111         if (gpio_curr > 0)
 112                 gpio_curr -= 1;
 113
 114         /* Read the GPIO voltage from the GPIOADC register */
 115         data->gpios[gpio_curr] = data->vregs[LTC4245_GPIOADC - 0x10];
 116
 117         /* Find the next GPIO pin to read */
 118         gpio_next = (gpio_curr + 1) % ARRAY_SIZE(data->gpios);
 119
 120         /*
 121          * Calculate the correct setting for the GPIO register so it will
 122          * sample the next GPIO pin
 123          */
 124         gpio_reg = (data->cregs[LTC4245_GPIO] & 0x3f) | ((gpio_next + 1) << 6);
 125
 126         /* Update the GPIO register */
 127         i2c_smbus_write_byte_data(client, LTC4245_GPIO, gpio_reg);
 128
 129         /* Update saved data */
 130         data->cregs[LTC4245_GPIO] = gpio_reg;
 131 }
 132
 133 static struct ltc4245_data *ltc4245_update_device(struct device *dev)
 134 {
 135         struct ltc4245_data *data = dev_get_drvdata(dev);
 136         struct i2c_client *client = data->client;
 137         s32 val;
 138         int i;
 139
 140         mutex_lock(&data->update_lock);
 141
 142         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 143
 144                 dev_dbg(&client->dev, "Starting ltc4245 update\n");
 145
 146                 /* Read control registers -- 0x00 to 0x07 */
 147                 for (i = 0; i < ARRAY_SIZE(data->cregs); i++) {
 148                         val = i2c_smbus_read_byte_data(client, i);
 149                         if (unlikely(val < 0))
 150                                 data->cregs[i] = 0;
 151                         else
 152                                 data->cregs[i] = val;
 153                 }
 154
 155                 /* Read voltage registers -- 0x10 to 0x1c */
 156                 for (i = 0; i < ARRAY_SIZE(data->vregs); i++) {
 157                         val = i2c_smbus_read_byte_data(client, i+0x10);
 158                         if (unlikely(val < 0))
 159                                 data->vregs[i] = 0;
 160                         else
 161                                 data->vregs[i] = val;
 162                 }
 163
 164                 /* Update GPIO readings */
 165                 ltc4245_update_gpios(dev);
 166
 167                 data->last_updated = jiffies;
 168                 data->valid = 1;
 169         }
 170
 171         mutex_unlock(&data->update_lock);
 172
 173         return data;
 174 }
 175
 176 /* Return the voltage from the given register in millivolts */
 177 static int ltc4245_get_voltage(struct device *dev, u8 reg)
 178 {
 179         struct ltc4245_data *data = ltc4245_update_device(dev);
 180         const u8 regval = data->vregs[reg - 0x10];
 181         u32 voltage = 0;
 182
 183         switch (reg) {
 184         case LTC4245_12VIN:
 185         case LTC4245_12VOUT:
 186                 voltage = regval * 55;
 187                 break;
 188         case LTC4245_5VIN:
 189         case LTC4245_5VOUT:
 190                 voltage = regval * 22;
 191                 break;
 192         case LTC4245_3VIN:
 193         case LTC4245_3VOUT:
 194                 voltage = regval * 15;
 195                 break;
 196         case LTC4245_VEEIN:
 197         case LTC4245_VEEOUT:
 198                 voltage = regval * -55;
 199                 break;
 200         case LTC4245_GPIOADC:
 201                 voltage = regval * 10;
 202                 break;
 203         default:
 204                 /* If we get here, the developer messed up */
 205                 WARN_ON_ONCE(1);
 206                 break;
 207         }
 208
 209         return voltage;
 210 }
 211
 212 /* Return the current in the given sense register in milliAmperes */
 213 static unsigned int ltc4245_get_current(struct device *dev, u8 reg)
 214 {
 215         struct ltc4245_data *data = ltc4245_update_device(dev);
 216         const u8 regval = data->vregs[reg - 0x10];
 217         unsigned int voltage;
 218         unsigned int curr;
 219
 220         /*
 221          * The strange looking conversions that follow are fixed-point
 222          * math, since we cannot do floating point in the kernel.
 223          *
 224          * Step 1: convert sense register to microVolts
 225          * Step 2: convert voltage to milliAmperes
 226          *
 227          * If you play around with the V=IR equation, you come up with
 228          * the following: X uV / Y mOhm == Z mA
 229          *
 230          * With the resistors that are fractions of a milliOhm, we multiply
 231          * the voltage and resistance by 10, to shift the decimal point.
 232          * Now we can use the normal division operator again.
 233          */
 234
 235         switch (reg) {
 236         case LTC4245_12VSENSE:
 237                 voltage = regval * 250; /* voltage in uV */
 238                 curr = voltage / 50; /* sense resistor 50 mOhm */
 239                 break;
 240         case LTC4245_5VSENSE:
 241                 voltage = regval * 125; /* voltage in uV */
 242                 curr = (voltage * 10) / 35; /* sense resistor 3.5 mOhm */
 243                 break;
 244         case LTC4245_3VSENSE:
 245                 voltage = regval * 125; /* voltage in uV */
 246                 curr = (voltage * 10) / 25; /* sense resistor 2.5 mOhm */
 247                 break;
 248         case LTC4245_VEESENSE:
 249                 voltage = regval * 250; /* voltage in uV */
 250                 curr = voltage / 100; /* sense resistor 100 mOhm */
 251                 break;
 252         default:
 253                 /* If we get here, the developer messed up */
 254                 WARN_ON_ONCE(1);
 255                 curr = 0;
 256                 break;
 257         }
 258
 259         return curr;
 260 }
 261
 262 static ssize_t ltc4245_show_voltage(struct device *dev,
 263                                     struct device_attribute *da,
 264                                     char *buf)
 265 {
 266         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 267         const int voltage = ltc4245_get_voltage(dev, attr->index);
 268
 269         return snprintf(buf, PAGE_SIZE, "%d\n", voltage);
 270 }
 271
 272 static ssize_t ltc4245_show_current(struct device *dev,
 273                                     struct device_attribute *da,
 274                                     char *buf)
 275 {
 276         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 277         const unsigned int curr = ltc4245_get_current(dev, attr->index);
 278
 279         return snprintf(buf, PAGE_SIZE, "%u\n", curr);
 280 }
 281
 282 static ssize_t ltc4245_show_power(struct device *dev,
 283                                   struct device_attribute *da,
 284                                   char *buf)
 285 {
 286         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 287         const unsigned int curr = ltc4245_get_current(dev, attr->index);
 288         const int output_voltage = ltc4245_get_voltage(dev, attr->index+1);
 289
 290         /* current in mA * voltage in mV == power in uW */
 291         const unsigned int power = abs(output_voltage * curr);
 292
 293         return snprintf(buf, PAGE_SIZE, "%u\n", power);
 294 }
 295
 296 static ssize_t ltc4245_show_alarm(struct device *dev,
 297                                           struct device_attribute *da,
 298                                           char *buf)
 299 {
 300         struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da);
 301         struct ltc4245_data *data = ltc4245_update_device(dev);
 302         const u8 reg = data->cregs[attr->index];
 303         const u32 mask = attr->nr;
 304
 305         return snprintf(buf, PAGE_SIZE, "%u\n", (reg & mask) ? 1 : 0);
 306 }
 307
 308 static ssize_t ltc4245_show_gpio(struct device *dev,
 309                                  struct device_attribute *da,
 310                                  char *buf)
 311 {
 312         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 313         struct ltc4245_data *data = ltc4245_update_device(dev);
 314         int val = data->gpios[attr->index];
 315
 316         /* handle stale GPIO's */
 317         if (val < 0)
 318                 return val;
 319
 320         /* Convert to millivolts and print */
 321         return snprintf(buf, PAGE_SIZE, "%u\n", val * 10);
 322 }
 323
 324 /* Construct a sensor_device_attribute structure for each register */
 325
 326 /* Input voltages */
 327 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ltc4245_show_voltage, NULL,
 328                           LTC4245_12VIN);
 329 static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, ltc4245_show_voltage, NULL,
 330                           LTC4245_5VIN);
 331 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, ltc4245_show_voltage, NULL,
 332                           LTC4245_3VIN);
 333 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, ltc4245_show_voltage, NULL,
 334                           LTC4245_VEEIN);
 335
 336 /* Input undervoltage alarms */
 337 static SENSOR_DEVICE_ATTR_2(in1_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 338                             1 << 0, LTC4245_FAULT1);
 339 static SENSOR_DEVICE_ATTR_2(in2_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 340                             1 << 1, LTC4245_FAULT1);
 341 static SENSOR_DEVICE_ATTR_2(in3_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 342                             1 << 2, LTC4245_FAULT1);
 343 static SENSOR_DEVICE_ATTR_2(in4_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 344                             1 << 3, LTC4245_FAULT1);
 345
 346 /* Currents (via sense resistor) */
 347 static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ltc4245_show_current, NULL,
 348                           LTC4245_12VSENSE);
 349 static SENSOR_DEVICE_ATTR(curr2_input, S_IRUGO, ltc4245_show_current, NULL,
 350                           LTC4245_5VSENSE);
 351 static SENSOR_DEVICE_ATTR(curr3_input, S_IRUGO, ltc4245_show_current, NULL,
 352                           LTC4245_3VSENSE);
 353 static SENSOR_DEVICE_ATTR(curr4_input, S_IRUGO, ltc4245_show_current, NULL,
 354                           LTC4245_VEESENSE);
 355
 356 /* Overcurrent alarms */
 357 static SENSOR_DEVICE_ATTR_2(curr1_max_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 358                             1 << 4, LTC4245_FAULT1);
 359 static SENSOR_DEVICE_ATTR_2(curr2_max_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 360                             1 << 5, LTC4245_FAULT1);
 361 static SENSOR_DEVICE_ATTR_2(curr3_max_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 362                             1 << 6, LTC4245_FAULT1);
 363 static SENSOR_DEVICE_ATTR_2(curr4_max_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 364                             1 << 7, LTC4245_FAULT1);
 365
 366 /* Output voltages */
 367 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, ltc4245_show_voltage, NULL,
 368                           LTC4245_12VOUT);
 369 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, ltc4245_show_voltage, NULL,
 370                           LTC4245_5VOUT);
 371 static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, ltc4245_show_voltage, NULL,
 372                           LTC4245_3VOUT);
 373 static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, ltc4245_show_voltage, NULL,
 374                           LTC4245_VEEOUT);
 375
 376 /* Power Bad alarms */
 377 static SENSOR_DEVICE_ATTR_2(in5_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 378                             1 << 0, LTC4245_FAULT2);
 379 static SENSOR_DEVICE_ATTR_2(in6_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 380                             1 << 1, LTC4245_FAULT2);
 381 static SENSOR_DEVICE_ATTR_2(in7_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 382                             1 << 2, LTC4245_FAULT2);
 383 static SENSOR_DEVICE_ATTR_2(in8_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 384                             1 << 3, LTC4245_FAULT2);
 385
 386 /* GPIO voltages */
 387 static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, ltc4245_show_gpio, NULL, 0);
 388 static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, ltc4245_show_gpio, NULL, 1);
 389 static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, ltc4245_show_gpio, NULL, 2);
 390
 391 /* Power Consumption (virtual) */
 392 static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ltc4245_show_power, NULL,
 393                           LTC4245_12VSENSE);
 394 static SENSOR_DEVICE_ATTR(power2_input, S_IRUGO, ltc4245_show_power, NULL,
 395                           LTC4245_5VSENSE);
 396 static SENSOR_DEVICE_ATTR(power3_input, S_IRUGO, ltc4245_show_power, NULL,
 397                           LTC4245_3VSENSE);
 398 static SENSOR_DEVICE_ATTR(power4_input, S_IRUGO, ltc4245_show_power, NULL,
 399                           LTC4245_VEESENSE);
 400
 401 /*
 402  * Finally, construct an array of pointers to members of the above objects,
 403  * as required for sysfs_create_group()
 404  */
 405 static struct attribute *ltc4245_std_attributes[] = {
 406         &sensor_dev_attr_in1_input.dev_attr.attr,
 407         &sensor_dev_attr_in2_input.dev_attr.attr,
 408         &sensor_dev_attr_in3_input.dev_attr.attr,
 409         &sensor_dev_attr_in4_input.dev_attr.attr,
 410
 411         &sensor_dev_attr_in1_min_alarm.dev_attr.attr,
 412         &sensor_dev_attr_in2_min_alarm.dev_attr.attr,
 413         &sensor_dev_attr_in3_min_alarm.dev_attr.attr,
 414         &sensor_dev_attr_in4_min_alarm.dev_attr.attr,
 415
 416         &sensor_dev_attr_curr1_input.dev_attr.attr,
 417         &sensor_dev_attr_curr2_input.dev_attr.attr,
 418         &sensor_dev_attr_curr3_input.dev_attr.attr,
 419         &sensor_dev_attr_curr4_input.dev_attr.attr,
 420
 421         &sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
 422         &sensor_dev_attr_curr2_max_alarm.dev_attr.attr,
 423         &sensor_dev_attr_curr3_max_alarm.dev_attr.attr,
 424         &sensor_dev_attr_curr4_max_alarm.dev_attr.attr,
 425
 426         &sensor_dev_attr_in5_input.dev_attr.attr,
 427         &sensor_dev_attr_in6_input.dev_attr.attr,
 428         &sensor_dev_attr_in7_input.dev_attr.attr,
 429         &sensor_dev_attr_in8_input.dev_attr.attr,
 430
 431         &sensor_dev_attr_in5_min_alarm.dev_attr.attr,
 432         &sensor_dev_attr_in6_min_alarm.dev_attr.attr,
 433         &sensor_dev_attr_in7_min_alarm.dev_attr.attr,
 434         &sensor_dev_attr_in8_min_alarm.dev_attr.attr,
 435
 436         &sensor_dev_attr_in9_input.dev_attr.attr,
 437
 438         &sensor_dev_attr_power1_input.dev_attr.attr,
 439         &sensor_dev_attr_power2_input.dev_attr.attr,
 440         &sensor_dev_attr_power3_input.dev_attr.attr,
 441         &sensor_dev_attr_power4_input.dev_attr.attr,
 442
 443         NULL,
 444 };
 445
 446 static struct attribute *ltc4245_gpio_attributes[] = {
 447         &sensor_dev_attr_in10_input.dev_attr.attr,
 448         &sensor_dev_attr_in11_input.dev_attr.attr,
 449         NULL,
 450 };
 451
 452 static const struct attribute_group ltc4245_std_group = {
 453         .attrs = ltc4245_std_attributes,
 454 };
 455
 456 static const struct attribute_group ltc4245_gpio_group = {
 457         .attrs = ltc4245_gpio_attributes,
 458 };
 459
 460 static void ltc4245_sysfs_add_groups(struct ltc4245_data *data)
 461 {
 462         /* standard sysfs attributes */
 463         data->groups[0] = &ltc4245_std_group;
 464
 465         /* if we're using the extra gpio support, register it's attributes */
 466         if (data->use_extra_gpios)
 467                 data->groups[1] = &ltc4245_gpio_group;
 468 }
 469
 470 static bool ltc4245_use_extra_gpios(struct i2c_client *client)
 471 {
 472         struct ltc4245_platform_data *pdata = dev_get_platdata(&client->dev);
 473 #ifdef CONFIG_OF
 474         struct device_node *np = client->dev.of_node;
 475 #endif
 476
 477         /* prefer platform data */
 478         if (pdata)
 479                 return pdata->use_extra_gpios;
 480
 481 #ifdef CONFIG_OF
 482         /* fallback on OF */
 483         if (of_find_property(np, "ltc4245,use-extra-gpios", NULL))
 484                 return true;
 485 #endif
 486
 487         return false;
 488 }
 489
 490 static int ltc4245_probe(struct i2c_client *client,
 491                          const struct i2c_device_id *id)
 492 {
 493         struct i2c_adapter *adapter = client->adapter;
 494         struct ltc4245_data *data;
 495         struct device *hwmon_dev;
 496
 497         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 498                 return -ENODEV;
 499
 500         data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
 501         if (!data)
 502                 return -ENOMEM;
 503
 504         data->client = client;
 505         mutex_init(&data->update_lock);
 506         data->use_extra_gpios = ltc4245_use_extra_gpios(client);
 507
 508         /* Initialize the LTC4245 chip */
 509         i2c_smbus_write_byte_data(client, LTC4245_FAULT1, 0x00);
 510         i2c_smbus_write_byte_data(client, LTC4245_FAULT2, 0x00);
 511
 512         /* Add sysfs hooks */
 513         ltc4245_sysfs_add_groups(data);
 514
 515         hwmon_dev = hwmon_device_register_with_groups(&client->dev,
 516                                                       client->name, data,
 517                                                       data->groups);
 518         if (IS_ERR(hwmon_dev))
 519                 return PTR_ERR(hwmon_dev);
 520
 521         i2c_set_clientdata(client, hwmon_dev);
 522
 523         return 0;
 524 }
 525
 526 static int ltc4245_remove(struct i2c_client *client)
 527 {
 528         struct device *hwmon_dev = i2c_get_clientdata(client);
 529
 530         hwmon_device_unregister(hwmon_dev);
 531
 532         return 0;
 533 }
 534
 535 static const struct i2c_device_id ltc4245_id[] = {
 536         { "ltc4245", 0 },
 537         { }
 538 };
 539 MODULE_DEVICE_TABLE(i2c, ltc4245_id);
 540
 541 /* This is the driver that will be inserted */
 542 static struct i2c_driver ltc4245_driver = {
 543         .driver = {
 544                 .name   = "ltc4245",
 545         },
 546         .probe          = ltc4245_probe,
 547         .remove         = ltc4245_remove,
 548         .id_table       = ltc4245_id,
 549 };
 550
 551 module_i2c_driver(ltc4245_driver);
 552
 553 MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>");
 554 MODULE_DESCRIPTION("LTC4245 driver");
 555 MODULE_LICENSE("GPL");