1 /* 2 * lm63.c - driver for the National Semiconductor LM63 temperature sensor 3 * with integrated fan control 4 * Copyright (C) 2004-2005 Jean Delvare <khali@linux-fr.org> 5 * Based on the lm90 driver. 6 * 7 * The LM63 is a sensor chip made by National Semiconductor. It measures 8 * two temperatures (its own and one external one) and the speed of one 9 * fan, those speed it can additionally control. Complete datasheet can be 10 * obtained from National's website at: 11 * http://www.national.com/pf/LM/LM63.html 12 * 13 * The LM63 is basically an LM86 with fan speed monitoring and control 14 * capabilities added. It misses some of the LM86 features though: 15 * - No low limit for local temperature. 16 * - No critical limit for local temperature. 17 * - Critical limit for remote temperature can be changed only once. We 18 * will consider that the critical limit is read-only. 19 * 20 * The datasheet isn't very clear about what the tachometer reading is. 21 * I had a explanation from National Semiconductor though. The two lower 22 * bits of the read value have to be masked out. The value is still 16 bit 23 * in width. 24 * 25 * This program is free software; you can redistribute it and/or modify 26 * it under the terms of the GNU General Public License as published by 27 * the Free Software Foundation; either version 2 of the License, or 28 * (at your option) any later version. 29 * 30 * This program is distributed in the hope that it will be useful, 31 * but WITHOUT ANY WARRANTY; without even the implied warranty of 32 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 33 * GNU General Public License for more details. 34 * 35 * You should have received a copy of the GNU General Public License 36 * along with this program; if not, write to the Free Software 37 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 38 */ 39 40 #include <linux/module.h> 41 #include <linux/init.h> 42 #include <linux/slab.h> 43 #include <linux/jiffies.h> 44 #include <linux/i2c.h> 45 #include <linux/i2c-sensor.h> 46 #include <linux/hwmon-sysfs.h> 47 48 /* 49 * Addresses to scan 50 * Address is fully defined internally and cannot be changed. 51 */ 52 53 static unsigned short normal_i2c[] = { 0x4c, I2C_CLIENT_END }; 54 static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END }; 55 56 /* 57 * Insmod parameters 58 */ 59 60 SENSORS_INSMOD_1(lm63); 61 62 /* 63 * The LM63 registers 64 */ 65 66 #define LM63_REG_CONFIG1 0x03 67 #define LM63_REG_CONFIG2 0xBF 68 #define LM63_REG_CONFIG_FAN 0x4A 69 70 #define LM63_REG_TACH_COUNT_MSB 0x47 71 #define LM63_REG_TACH_COUNT_LSB 0x46 72 #define LM63_REG_TACH_LIMIT_MSB 0x49 73 #define LM63_REG_TACH_LIMIT_LSB 0x48 74 75 #define LM63_REG_PWM_VALUE 0x4C 76 #define LM63_REG_PWM_FREQ 0x4D 77 78 #define LM63_REG_LOCAL_TEMP 0x00 79 #define LM63_REG_LOCAL_HIGH 0x05 80 81 #define LM63_REG_REMOTE_TEMP_MSB 0x01 82 #define LM63_REG_REMOTE_TEMP_LSB 0x10 83 #define LM63_REG_REMOTE_OFFSET_MSB 0x11 84 #define LM63_REG_REMOTE_OFFSET_LSB 0x12 85 #define LM63_REG_REMOTE_HIGH_MSB 0x07 86 #define LM63_REG_REMOTE_HIGH_LSB 0x13 87 #define LM63_REG_REMOTE_LOW_MSB 0x08 88 #define LM63_REG_REMOTE_LOW_LSB 0x14 89 #define LM63_REG_REMOTE_TCRIT 0x19 90 #define LM63_REG_REMOTE_TCRIT_HYST 0x21 91 92 #define LM63_REG_ALERT_STATUS 0x02 93 #define LM63_REG_ALERT_MASK 0x16 94 95 #define LM63_REG_MAN_ID 0xFE 96 #define LM63_REG_CHIP_ID 0xFF 97 98 /* 99 * Conversions and various macros 100 * For tachometer counts, the LM63 uses 16-bit values. 101 * For local temperature and high limit, remote critical limit and hysteresis 102 * value, it uses signed 8-bit values with LSB = 1 degree Celsius. 103 * For remote temperature, low and high limits, it uses signed 11-bit values 104 * with LSB = 0.125 degree Celsius, left-justified in 16-bit registers. 105 */ 106 107 #define FAN_FROM_REG(reg) ((reg) == 0xFFFC || (reg) == 0 ? 0 : \ 108 5400000 / (reg)) 109 #define FAN_TO_REG(val) ((val) <= 82 ? 0xFFFC : \ 110 (5400000 / (val)) & 0xFFFC) 111 #define TEMP8_FROM_REG(reg) ((reg) * 1000) 112 #define TEMP8_TO_REG(val) ((val) <= -128000 ? -128 : \ 113 (val) >= 127000 ? 127 : \ 114 (val) < 0 ? ((val) - 500) / 1000 : \ 115 ((val) + 500) / 1000) 116 #define TEMP11_FROM_REG(reg) ((reg) / 32 * 125) 117 #define TEMP11_TO_REG(val) ((val) <= -128000 ? 0x8000 : \ 118 (val) >= 127875 ? 0x7FE0 : \ 119 (val) < 0 ? ((val) - 62) / 125 * 32 : \ 120 ((val) + 62) / 125 * 32) 121 #define HYST_TO_REG(val) ((val) <= 0 ? 0 : \ 122 (val) >= 127000 ? 127 : \ 123 ((val) + 500) / 1000) 124 125 /* 126 * Functions declaration 127 */ 128 129 static int lm63_attach_adapter(struct i2c_adapter *adapter); 130 static int lm63_detach_client(struct i2c_client *client); 131 132 static struct lm63_data *lm63_update_device(struct device *dev); 133 134 static int lm63_detect(struct i2c_adapter *adapter, int address, int kind); 135 static void lm63_init_client(struct i2c_client *client); 136 137 /* 138 * Driver data (common to all clients) 139 */ 140 141 static struct i2c_driver lm63_driver = { 142 .owner = THIS_MODULE, 143 .name = "lm63", 144 .flags = I2C_DF_NOTIFY, 145 .attach_adapter = lm63_attach_adapter, 146 .detach_client = lm63_detach_client, 147 }; 148 149 /* 150 * Client data (each client gets its own) 151 */ 152 153 struct lm63_data { 154 struct i2c_client client; 155 struct semaphore update_lock; 156 char valid; /* zero until following fields are valid */ 157 unsigned long last_updated; /* in jiffies */ 158 159 /* registers values */ 160 u8 config, config_fan; 161 u16 fan[2]; /* 0: input 162 1: low limit */ 163 u8 pwm1_freq; 164 u8 pwm1_value; 165 s8 temp8[3]; /* 0: local input 166 1: local high limit 167 2: remote critical limit */ 168 s16 temp11[3]; /* 0: remote input 169 1: remote low limit 170 2: remote high limit */ 171 u8 temp2_crit_hyst; 172 u8 alarms; 173 }; 174 175 /* 176 * Sysfs callback functions and files 177 */ 178 179 static ssize_t show_fan(struct device *dev, struct device_attribute *devattr, 180 char *buf) 181 { 182 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 183 struct lm63_data *data = lm63_update_device(dev); 184 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index])); 185 } 186 187 static ssize_t set_fan(struct device *dev, struct device_attribute *dummy, 188 const char *buf, size_t count) 189 { 190 struct i2c_client *client = to_i2c_client(dev); 191 struct lm63_data *data = i2c_get_clientdata(client); 192 unsigned long val = simple_strtoul(buf, NULL, 10); 193 194 down(&data->update_lock); 195 data->fan[1] = FAN_TO_REG(val); 196 i2c_smbus_write_byte_data(client, LM63_REG_TACH_LIMIT_LSB, 197 data->fan[1] & 0xFF); 198 i2c_smbus_write_byte_data(client, LM63_REG_TACH_LIMIT_MSB, 199 data->fan[1] >> 8); 200 up(&data->update_lock); 201 return count; 202 } 203 204 static ssize_t show_pwm1(struct device *dev, struct device_attribute *dummy, 205 char *buf) 206 { 207 struct lm63_data *data = lm63_update_device(dev); 208 return sprintf(buf, "%d\n", data->pwm1_value >= 2 * data->pwm1_freq ? 209 255 : (data->pwm1_value * 255 + data->pwm1_freq) / 210 (2 * data->pwm1_freq)); 211 } 212 213 static ssize_t set_pwm1(struct device *dev, struct device_attribute *dummy, 214 const char *buf, size_t count) 215 { 216 struct i2c_client *client = to_i2c_client(dev); 217 struct lm63_data *data = i2c_get_clientdata(client); 218 unsigned long val; 219 220 if (!(data->config_fan & 0x20)) /* register is read-only */ 221 return -EPERM; 222 223 val = simple_strtoul(buf, NULL, 10); 224 down(&data->update_lock); 225 data->pwm1_value = val <= 0 ? 0 : 226 val >= 255 ? 2 * data->pwm1_freq : 227 (val * data->pwm1_freq * 2 + 127) / 255; 228 i2c_smbus_write_byte_data(client, LM63_REG_PWM_VALUE, data->pwm1_value); 229 up(&data->update_lock); 230 return count; 231 } 232 233 static ssize_t show_pwm1_enable(struct device *dev, struct device_attribute *dummy, 234 char *buf) 235 { 236 struct lm63_data *data = lm63_update_device(dev); 237 return sprintf(buf, "%d\n", data->config_fan & 0x20 ? 1 : 2); 238 } 239 240 static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr, 241 char *buf) 242 { 243 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 244 struct lm63_data *data = lm63_update_device(dev); 245 return sprintf(buf, "%d\n", TEMP8_FROM_REG(data->temp8[attr->index])); 246 } 247 248 static ssize_t set_temp8(struct device *dev, struct device_attribute *dummy, 249 const char *buf, size_t count) 250 { 251 struct i2c_client *client = to_i2c_client(dev); 252 struct lm63_data *data = i2c_get_clientdata(client); 253 long val = simple_strtol(buf, NULL, 10); 254 255 down(&data->update_lock); 256 data->temp8[1] = TEMP8_TO_REG(val); 257 i2c_smbus_write_byte_data(client, LM63_REG_LOCAL_HIGH, data->temp8[1]); 258 up(&data->update_lock); 259 return count; 260 } 261 262 static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr, 263 char *buf) 264 { 265 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 266 struct lm63_data *data = lm63_update_device(dev); 267 return sprintf(buf, "%d\n", TEMP11_FROM_REG(data->temp11[attr->index])); 268 } 269 270 static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr, 271 const char *buf, size_t count) 272 { 273 static const u8 reg[4] = { 274 LM63_REG_REMOTE_LOW_MSB, 275 LM63_REG_REMOTE_LOW_LSB, 276 LM63_REG_REMOTE_HIGH_MSB, 277 LM63_REG_REMOTE_HIGH_LSB, 278 }; 279 280 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 281 struct i2c_client *client = to_i2c_client(dev); 282 struct lm63_data *data = i2c_get_clientdata(client); 283 long val = simple_strtol(buf, NULL, 10); 284 int nr = attr->index; 285 286 down(&data->update_lock); 287 data->temp11[nr] = TEMP11_TO_REG(val); 288 i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2], 289 data->temp11[nr] >> 8); 290 i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1], 291 data->temp11[nr] & 0xff); 292 up(&data->update_lock); 293 return count; 294 } 295 296 /* Hysteresis register holds a relative value, while we want to present 297 an absolute to user-space */ 298 static ssize_t show_temp2_crit_hyst(struct device *dev, struct device_attribute *dummy, 299 char *buf) 300 { 301 struct lm63_data *data = lm63_update_device(dev); 302 return sprintf(buf, "%d\n", TEMP8_FROM_REG(data->temp8[2]) 303 - TEMP8_FROM_REG(data->temp2_crit_hyst)); 304 } 305 306 /* And now the other way around, user-space provides an absolute 307 hysteresis value and we have to store a relative one */ 308 static ssize_t set_temp2_crit_hyst(struct device *dev, struct device_attribute *dummy, 309 const char *buf, size_t count) 310 { 311 struct i2c_client *client = to_i2c_client(dev); 312 struct lm63_data *data = i2c_get_clientdata(client); 313 long val = simple_strtol(buf, NULL, 10); 314 long hyst; 315 316 down(&data->update_lock); 317 hyst = TEMP8_FROM_REG(data->temp8[2]) - val; 318 i2c_smbus_write_byte_data(client, LM63_REG_REMOTE_TCRIT_HYST, 319 HYST_TO_REG(hyst)); 320 up(&data->update_lock); 321 return count; 322 } 323 324 static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy, 325 char *buf) 326 { 327 struct lm63_data *data = lm63_update_device(dev); 328 return sprintf(buf, "%u\n", data->alarms); 329 } 330 331 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0); 332 static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan, 333 set_fan, 1); 334 335 static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm1, set_pwm1); 336 static DEVICE_ATTR(pwm1_enable, S_IRUGO, show_pwm1_enable, NULL); 337 338 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp8, NULL, 0); 339 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8, 340 set_temp8, 1); 341 342 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0); 343 static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11, 344 set_temp11, 1); 345 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11, 346 set_temp11, 2); 347 static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp8, NULL, 2); 348 static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp2_crit_hyst, 349 set_temp2_crit_hyst); 350 351 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 352 353 /* 354 * Real code 355 */ 356 357 static int lm63_attach_adapter(struct i2c_adapter *adapter) 358 { 359 if (!(adapter->class & I2C_CLASS_HWMON)) 360 return 0; 361 return i2c_detect(adapter, &addr_data, lm63_detect); 362 } 363 364 /* 365 * The following function does more than just detection. If detection 366 * succeeds, it also registers the new chip. 367 */ 368 static int lm63_detect(struct i2c_adapter *adapter, int address, int kind) 369 { 370 struct i2c_client *new_client; 371 struct lm63_data *data; 372 int err = 0; 373 374 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 375 goto exit; 376 377 if (!(data = kmalloc(sizeof(struct lm63_data), GFP_KERNEL))) { 378 err = -ENOMEM; 379 goto exit; 380 } 381 memset(data, 0, sizeof(struct lm63_data)); 382 383 /* The common I2C client data is placed right before the 384 LM63-specific data. */ 385 new_client = &data->client; 386 i2c_set_clientdata(new_client, data); 387 new_client->addr = address; 388 new_client->adapter = adapter; 389 new_client->driver = &lm63_driver; 390 new_client->flags = 0; 391 392 /* Default to an LM63 if forced */ 393 if (kind == 0) 394 kind = lm63; 395 396 if (kind < 0) { /* must identify */ 397 u8 man_id, chip_id, reg_config1, reg_config2; 398 u8 reg_alert_status, reg_alert_mask; 399 400 man_id = i2c_smbus_read_byte_data(new_client, 401 LM63_REG_MAN_ID); 402 chip_id = i2c_smbus_read_byte_data(new_client, 403 LM63_REG_CHIP_ID); 404 reg_config1 = i2c_smbus_read_byte_data(new_client, 405 LM63_REG_CONFIG1); 406 reg_config2 = i2c_smbus_read_byte_data(new_client, 407 LM63_REG_CONFIG2); 408 reg_alert_status = i2c_smbus_read_byte_data(new_client, 409 LM63_REG_ALERT_STATUS); 410 reg_alert_mask = i2c_smbus_read_byte_data(new_client, 411 LM63_REG_ALERT_MASK); 412 413 if (man_id == 0x01 /* National Semiconductor */ 414 && chip_id == 0x41 /* LM63 */ 415 && (reg_config1 & 0x18) == 0x00 416 && (reg_config2 & 0xF8) == 0x00 417 && (reg_alert_status & 0x20) == 0x00 418 && (reg_alert_mask & 0xA4) == 0xA4) { 419 kind = lm63; 420 } else { /* failed */ 421 dev_dbg(&adapter->dev, "Unsupported chip " 422 "(man_id=0x%02X, chip_id=0x%02X).\n", 423 man_id, chip_id); 424 goto exit_free; 425 } 426 } 427 428 strlcpy(new_client->name, "lm63", I2C_NAME_SIZE); 429 data->valid = 0; 430 init_MUTEX(&data->update_lock); 431 432 /* Tell the I2C layer a new client has arrived */ 433 if ((err = i2c_attach_client(new_client))) 434 goto exit_free; 435 436 /* Initialize the LM63 chip */ 437 lm63_init_client(new_client); 438 439 /* Register sysfs hooks */ 440 if (data->config & 0x04) { /* tachometer enabled */ 441 device_create_file(&new_client->dev, 442 &sensor_dev_attr_fan1_input.dev_attr); 443 device_create_file(&new_client->dev, 444 &sensor_dev_attr_fan1_min.dev_attr); 445 } 446 device_create_file(&new_client->dev, &dev_attr_pwm1); 447 device_create_file(&new_client->dev, &dev_attr_pwm1_enable); 448 device_create_file(&new_client->dev, 449 &sensor_dev_attr_temp1_input.dev_attr); 450 device_create_file(&new_client->dev, 451 &sensor_dev_attr_temp2_input.dev_attr); 452 device_create_file(&new_client->dev, 453 &sensor_dev_attr_temp2_min.dev_attr); 454 device_create_file(&new_client->dev, 455 &sensor_dev_attr_temp1_max.dev_attr); 456 device_create_file(&new_client->dev, 457 &sensor_dev_attr_temp2_max.dev_attr); 458 device_create_file(&new_client->dev, 459 &sensor_dev_attr_temp2_crit.dev_attr); 460 device_create_file(&new_client->dev, &dev_attr_temp2_crit_hyst); 461 device_create_file(&new_client->dev, &dev_attr_alarms); 462 463 return 0; 464 465 exit_free: 466 kfree(data); 467 exit: 468 return err; 469 } 470 471 /* Idealy we shouldn't have to initialize anything, since the BIOS 472 should have taken care of everything */ 473 static void lm63_init_client(struct i2c_client *client) 474 { 475 struct lm63_data *data = i2c_get_clientdata(client); 476 477 data->config = i2c_smbus_read_byte_data(client, LM63_REG_CONFIG1); 478 data->config_fan = i2c_smbus_read_byte_data(client, 479 LM63_REG_CONFIG_FAN); 480 481 /* Start converting if needed */ 482 if (data->config & 0x40) { /* standby */ 483 dev_dbg(&client->dev, "Switching to operational mode"); 484 data->config &= 0xA7; 485 i2c_smbus_write_byte_data(client, LM63_REG_CONFIG1, 486 data->config); 487 } 488 489 /* We may need pwm1_freq before ever updating the client data */ 490 data->pwm1_freq = i2c_smbus_read_byte_data(client, LM63_REG_PWM_FREQ); 491 if (data->pwm1_freq == 0) 492 data->pwm1_freq = 1; 493 494 /* Show some debug info about the LM63 configuration */ 495 dev_dbg(&client->dev, "Alert/tach pin configured for %s\n", 496 (data->config & 0x04) ? "tachometer input" : 497 "alert output"); 498 dev_dbg(&client->dev, "PWM clock %s kHz, output frequency %u Hz\n", 499 (data->config_fan & 0x08) ? "1.4" : "360", 500 ((data->config_fan & 0x08) ? 700 : 180000) / data->pwm1_freq); 501 dev_dbg(&client->dev, "PWM output active %s, %s mode\n", 502 (data->config_fan & 0x10) ? "low" : "high", 503 (data->config_fan & 0x20) ? "manual" : "auto"); 504 } 505 506 static int lm63_detach_client(struct i2c_client *client) 507 { 508 int err; 509 510 if ((err = i2c_detach_client(client))) { 511 dev_err(&client->dev, "Client deregistration failed, " 512 "client not detached\n"); 513 return err; 514 } 515 516 kfree(i2c_get_clientdata(client)); 517 return 0; 518 } 519 520 static struct lm63_data *lm63_update_device(struct device *dev) 521 { 522 struct i2c_client *client = to_i2c_client(dev); 523 struct lm63_data *data = i2c_get_clientdata(client); 524 525 down(&data->update_lock); 526 527 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 528 if (data->config & 0x04) { /* tachometer enabled */ 529 /* order matters for fan1_input */ 530 data->fan[0] = i2c_smbus_read_byte_data(client, 531 LM63_REG_TACH_COUNT_LSB) & 0xFC; 532 data->fan[0] |= i2c_smbus_read_byte_data(client, 533 LM63_REG_TACH_COUNT_MSB) << 8; 534 data->fan[1] = (i2c_smbus_read_byte_data(client, 535 LM63_REG_TACH_LIMIT_LSB) & 0xFC) 536 | (i2c_smbus_read_byte_data(client, 537 LM63_REG_TACH_LIMIT_MSB) << 8); 538 } 539 540 data->pwm1_freq = i2c_smbus_read_byte_data(client, 541 LM63_REG_PWM_FREQ); 542 if (data->pwm1_freq == 0) 543 data->pwm1_freq = 1; 544 data->pwm1_value = i2c_smbus_read_byte_data(client, 545 LM63_REG_PWM_VALUE); 546 547 data->temp8[0] = i2c_smbus_read_byte_data(client, 548 LM63_REG_LOCAL_TEMP); 549 data->temp8[1] = i2c_smbus_read_byte_data(client, 550 LM63_REG_LOCAL_HIGH); 551 552 /* order matters for temp2_input */ 553 data->temp11[0] = i2c_smbus_read_byte_data(client, 554 LM63_REG_REMOTE_TEMP_MSB) << 8; 555 data->temp11[0] |= i2c_smbus_read_byte_data(client, 556 LM63_REG_REMOTE_TEMP_LSB); 557 data->temp11[1] = (i2c_smbus_read_byte_data(client, 558 LM63_REG_REMOTE_LOW_MSB) << 8) 559 | i2c_smbus_read_byte_data(client, 560 LM63_REG_REMOTE_LOW_LSB); 561 data->temp11[2] = (i2c_smbus_read_byte_data(client, 562 LM63_REG_REMOTE_HIGH_MSB) << 8) 563 | i2c_smbus_read_byte_data(client, 564 LM63_REG_REMOTE_HIGH_LSB); 565 data->temp8[2] = i2c_smbus_read_byte_data(client, 566 LM63_REG_REMOTE_TCRIT); 567 data->temp2_crit_hyst = i2c_smbus_read_byte_data(client, 568 LM63_REG_REMOTE_TCRIT_HYST); 569 570 data->alarms = i2c_smbus_read_byte_data(client, 571 LM63_REG_ALERT_STATUS) & 0x7F; 572 573 data->last_updated = jiffies; 574 data->valid = 1; 575 } 576 577 up(&data->update_lock); 578 579 return data; 580 } 581 582 static int __init sensors_lm63_init(void) 583 { 584 return i2c_add_driver(&lm63_driver); 585 } 586 587 static void __exit sensors_lm63_exit(void) 588 { 589 i2c_del_driver(&lm63_driver); 590 } 591 592 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); 593 MODULE_DESCRIPTION("LM63 driver"); 594 MODULE_LICENSE("GPL"); 595 596 module_init(sensors_lm63_init); 597 module_exit(sensors_lm63_exit); 598