1 /* 2 * lm80.c - From lm_sensors, Linux kernel modules for hardware 3 * monitoring 4 * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl> 5 * and Philip Edelbrock <phil@netroedge.com> 6 * 7 * Ported to Linux 2.6 by Tiago Sousa <mirage@kaotik.org> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 */ 23 24 #include <linux/module.h> 25 #include <linux/init.h> 26 #include <linux/slab.h> 27 #include <linux/jiffies.h> 28 #include <linux/i2c.h> 29 #include <linux/hwmon.h> 30 #include <linux/hwmon-sysfs.h> 31 #include <linux/err.h> 32 #include <linux/mutex.h> 33 34 /* Addresses to scan */ 35 static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 36 0x2e, 0x2f, I2C_CLIENT_END }; 37 38 /* Insmod parameters */ 39 I2C_CLIENT_INSMOD_1(lm80); 40 41 /* Many LM80 constants specified below */ 42 43 /* The LM80 registers */ 44 #define LM80_REG_IN_MAX(nr) (0x2a + (nr) * 2) 45 #define LM80_REG_IN_MIN(nr) (0x2b + (nr) * 2) 46 #define LM80_REG_IN(nr) (0x20 + (nr)) 47 48 #define LM80_REG_FAN1 0x28 49 #define LM80_REG_FAN2 0x29 50 #define LM80_REG_FAN_MIN(nr) (0x3b + (nr)) 51 52 #define LM80_REG_TEMP 0x27 53 #define LM80_REG_TEMP_HOT_MAX 0x38 54 #define LM80_REG_TEMP_HOT_HYST 0x39 55 #define LM80_REG_TEMP_OS_MAX 0x3a 56 #define LM80_REG_TEMP_OS_HYST 0x3b 57 58 #define LM80_REG_CONFIG 0x00 59 #define LM80_REG_ALARM1 0x01 60 #define LM80_REG_ALARM2 0x02 61 #define LM80_REG_MASK1 0x03 62 #define LM80_REG_MASK2 0x04 63 #define LM80_REG_FANDIV 0x05 64 #define LM80_REG_RES 0x06 65 66 67 /* Conversions. Rounding and limit checking is only done on the TO_REG 68 variants. Note that you should be a bit careful with which arguments 69 these macros are called: arguments may be evaluated more than once. 70 Fixing this is just not worth it. */ 71 72 #define IN_TO_REG(val) (SENSORS_LIMIT(((val)+5)/10,0,255)) 73 #define IN_FROM_REG(val) ((val)*10) 74 75 static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div) 76 { 77 if (rpm == 0) 78 return 255; 79 rpm = SENSORS_LIMIT(rpm, 1, 1000000); 80 return SENSORS_LIMIT((1350000 + rpm*div / 2) / (rpm*div), 1, 254); 81 } 82 83 #define FAN_FROM_REG(val,div) ((val)==0?-1:\ 84 (val)==255?0:1350000/((div)*(val))) 85 86 static inline long TEMP_FROM_REG(u16 temp) 87 { 88 long res; 89 90 temp >>= 4; 91 if (temp < 0x0800) 92 res = 625 * (long) temp; 93 else 94 res = ((long) temp - 0x01000) * 625; 95 96 return res / 10; 97 } 98 99 #define TEMP_LIMIT_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*1000) 100 101 #define TEMP_LIMIT_TO_REG(val) SENSORS_LIMIT((val)<0?\ 102 ((val)-500)/1000:((val)+500)/1000,0,255) 103 104 #define DIV_FROM_REG(val) (1 << (val)) 105 106 /* 107 * Client data (each client gets its own) 108 */ 109 110 struct lm80_data { 111 struct device *hwmon_dev; 112 struct mutex update_lock; 113 char valid; /* !=0 if following fields are valid */ 114 unsigned long last_updated; /* In jiffies */ 115 116 u8 in[7]; /* Register value */ 117 u8 in_max[7]; /* Register value */ 118 u8 in_min[7]; /* Register value */ 119 u8 fan[2]; /* Register value */ 120 u8 fan_min[2]; /* Register value */ 121 u8 fan_div[2]; /* Register encoding, shifted right */ 122 u16 temp; /* Register values, shifted right */ 123 u8 temp_hot_max; /* Register value */ 124 u8 temp_hot_hyst; /* Register value */ 125 u8 temp_os_max; /* Register value */ 126 u8 temp_os_hyst; /* Register value */ 127 u16 alarms; /* Register encoding, combined */ 128 }; 129 130 /* 131 * Functions declaration 132 */ 133 134 static int lm80_probe(struct i2c_client *client, 135 const struct i2c_device_id *id); 136 static int lm80_detect(struct i2c_client *client, int kind, 137 struct i2c_board_info *info); 138 static void lm80_init_client(struct i2c_client *client); 139 static int lm80_remove(struct i2c_client *client); 140 static struct lm80_data *lm80_update_device(struct device *dev); 141 static int lm80_read_value(struct i2c_client *client, u8 reg); 142 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value); 143 144 /* 145 * Driver data (common to all clients) 146 */ 147 148 static const struct i2c_device_id lm80_id[] = { 149 { "lm80", lm80 }, 150 { } 151 }; 152 MODULE_DEVICE_TABLE(i2c, lm80_id); 153 154 static struct i2c_driver lm80_driver = { 155 .class = I2C_CLASS_HWMON, 156 .driver = { 157 .name = "lm80", 158 }, 159 .probe = lm80_probe, 160 .remove = lm80_remove, 161 .id_table = lm80_id, 162 .detect = lm80_detect, 163 .address_data = &addr_data, 164 }; 165 166 /* 167 * Sysfs stuff 168 */ 169 170 #define show_in(suffix, value) \ 171 static ssize_t show_in_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \ 172 { \ 173 int nr = to_sensor_dev_attr(attr)->index; \ 174 struct lm80_data *data = lm80_update_device(dev); \ 175 return sprintf(buf, "%d\n", IN_FROM_REG(data->value[nr])); \ 176 } 177 show_in(min, in_min) 178 show_in(max, in_max) 179 show_in(input, in) 180 181 #define set_in(suffix, value, reg) \ 182 static ssize_t set_in_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \ 183 size_t count) \ 184 { \ 185 int nr = to_sensor_dev_attr(attr)->index; \ 186 struct i2c_client *client = to_i2c_client(dev); \ 187 struct lm80_data *data = i2c_get_clientdata(client); \ 188 long val = simple_strtol(buf, NULL, 10); \ 189 \ 190 mutex_lock(&data->update_lock);\ 191 data->value[nr] = IN_TO_REG(val); \ 192 lm80_write_value(client, reg(nr), data->value[nr]); \ 193 mutex_unlock(&data->update_lock);\ 194 return count; \ 195 } 196 set_in(min, in_min, LM80_REG_IN_MIN) 197 set_in(max, in_max, LM80_REG_IN_MAX) 198 199 #define show_fan(suffix, value) \ 200 static ssize_t show_fan_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \ 201 { \ 202 int nr = to_sensor_dev_attr(attr)->index; \ 203 struct lm80_data *data = lm80_update_device(dev); \ 204 return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[nr], \ 205 DIV_FROM_REG(data->fan_div[nr]))); \ 206 } 207 show_fan(min, fan_min) 208 show_fan(input, fan) 209 210 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr, 211 char *buf) 212 { 213 int nr = to_sensor_dev_attr(attr)->index; 214 struct lm80_data *data = lm80_update_device(dev); 215 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr])); 216 } 217 218 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr, 219 const char *buf, size_t count) 220 { 221 int nr = to_sensor_dev_attr(attr)->index; 222 struct i2c_client *client = to_i2c_client(dev); 223 struct lm80_data *data = i2c_get_clientdata(client); 224 long val = simple_strtoul(buf, NULL, 10); 225 226 mutex_lock(&data->update_lock); 227 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr])); 228 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]); 229 mutex_unlock(&data->update_lock); 230 return count; 231 } 232 233 /* Note: we save and restore the fan minimum here, because its value is 234 determined in part by the fan divisor. This follows the principle of 235 least surprise; the user doesn't expect the fan minimum to change just 236 because the divisor changed. */ 237 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr, 238 const char *buf, size_t count) 239 { 240 int nr = to_sensor_dev_attr(attr)->index; 241 struct i2c_client *client = to_i2c_client(dev); 242 struct lm80_data *data = i2c_get_clientdata(client); 243 unsigned long min, val = simple_strtoul(buf, NULL, 10); 244 u8 reg; 245 246 /* Save fan_min */ 247 mutex_lock(&data->update_lock); 248 min = FAN_FROM_REG(data->fan_min[nr], 249 DIV_FROM_REG(data->fan_div[nr])); 250 251 switch (val) { 252 case 1: data->fan_div[nr] = 0; break; 253 case 2: data->fan_div[nr] = 1; break; 254 case 4: data->fan_div[nr] = 2; break; 255 case 8: data->fan_div[nr] = 3; break; 256 default: 257 dev_err(&client->dev, "fan_div value %ld not " 258 "supported. Choose one of 1, 2, 4 or 8!\n", val); 259 mutex_unlock(&data->update_lock); 260 return -EINVAL; 261 } 262 263 reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1)))) 264 | (data->fan_div[nr] << (2 * (nr + 1))); 265 lm80_write_value(client, LM80_REG_FANDIV, reg); 266 267 /* Restore fan_min */ 268 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr])); 269 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]); 270 mutex_unlock(&data->update_lock); 271 272 return count; 273 } 274 275 static ssize_t show_temp_input1(struct device *dev, struct device_attribute *attr, char *buf) 276 { 277 struct lm80_data *data = lm80_update_device(dev); 278 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp)); 279 } 280 281 #define show_temp(suffix, value) \ 282 static ssize_t show_temp_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \ 283 { \ 284 struct lm80_data *data = lm80_update_device(dev); \ 285 return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \ 286 } 287 show_temp(hot_max, temp_hot_max); 288 show_temp(hot_hyst, temp_hot_hyst); 289 show_temp(os_max, temp_os_max); 290 show_temp(os_hyst, temp_os_hyst); 291 292 #define set_temp(suffix, value, reg) \ 293 static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \ 294 size_t count) \ 295 { \ 296 struct i2c_client *client = to_i2c_client(dev); \ 297 struct lm80_data *data = i2c_get_clientdata(client); \ 298 long val = simple_strtoul(buf, NULL, 10); \ 299 \ 300 mutex_lock(&data->update_lock); \ 301 data->value = TEMP_LIMIT_TO_REG(val); \ 302 lm80_write_value(client, reg, data->value); \ 303 mutex_unlock(&data->update_lock); \ 304 return count; \ 305 } 306 set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX); 307 set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST); 308 set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX); 309 set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST); 310 311 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, 312 char *buf) 313 { 314 struct lm80_data *data = lm80_update_device(dev); 315 return sprintf(buf, "%u\n", data->alarms); 316 } 317 318 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, 319 char *buf) 320 { 321 int bitnr = to_sensor_dev_attr(attr)->index; 322 struct lm80_data *data = lm80_update_device(dev); 323 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); 324 } 325 326 static SENSOR_DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO, 327 show_in_min, set_in_min, 0); 328 static SENSOR_DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO, 329 show_in_min, set_in_min, 1); 330 static SENSOR_DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO, 331 show_in_min, set_in_min, 2); 332 static SENSOR_DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO, 333 show_in_min, set_in_min, 3); 334 static SENSOR_DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO, 335 show_in_min, set_in_min, 4); 336 static SENSOR_DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO, 337 show_in_min, set_in_min, 5); 338 static SENSOR_DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO, 339 show_in_min, set_in_min, 6); 340 static SENSOR_DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO, 341 show_in_max, set_in_max, 0); 342 static SENSOR_DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO, 343 show_in_max, set_in_max, 1); 344 static SENSOR_DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO, 345 show_in_max, set_in_max, 2); 346 static SENSOR_DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO, 347 show_in_max, set_in_max, 3); 348 static SENSOR_DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO, 349 show_in_max, set_in_max, 4); 350 static SENSOR_DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO, 351 show_in_max, set_in_max, 5); 352 static SENSOR_DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO, 353 show_in_max, set_in_max, 6); 354 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in_input, NULL, 0); 355 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in_input, NULL, 1); 356 static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in_input, NULL, 2); 357 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in_input, NULL, 3); 358 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in_input, NULL, 4); 359 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, show_in_input, NULL, 5); 360 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, show_in_input, NULL, 6); 361 static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, 362 show_fan_min, set_fan_min, 0); 363 static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO, 364 show_fan_min, set_fan_min, 1); 365 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0); 366 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1); 367 static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, 368 show_fan_div, set_fan_div, 0); 369 static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO, 370 show_fan_div, set_fan_div, 1); 371 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL); 372 static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max, 373 set_temp_hot_max); 374 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst, 375 set_temp_hot_hyst); 376 static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max, 377 set_temp_os_max); 378 static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst, 379 set_temp_os_hyst); 380 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 381 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0); 382 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1); 383 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2); 384 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3); 385 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 4); 386 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 5); 387 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6); 388 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 10); 389 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 11); 390 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 8); 391 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 13); 392 393 /* 394 * Real code 395 */ 396 397 static struct attribute *lm80_attributes[] = { 398 &sensor_dev_attr_in0_min.dev_attr.attr, 399 &sensor_dev_attr_in1_min.dev_attr.attr, 400 &sensor_dev_attr_in2_min.dev_attr.attr, 401 &sensor_dev_attr_in3_min.dev_attr.attr, 402 &sensor_dev_attr_in4_min.dev_attr.attr, 403 &sensor_dev_attr_in5_min.dev_attr.attr, 404 &sensor_dev_attr_in6_min.dev_attr.attr, 405 &sensor_dev_attr_in0_max.dev_attr.attr, 406 &sensor_dev_attr_in1_max.dev_attr.attr, 407 &sensor_dev_attr_in2_max.dev_attr.attr, 408 &sensor_dev_attr_in3_max.dev_attr.attr, 409 &sensor_dev_attr_in4_max.dev_attr.attr, 410 &sensor_dev_attr_in5_max.dev_attr.attr, 411 &sensor_dev_attr_in6_max.dev_attr.attr, 412 &sensor_dev_attr_in0_input.dev_attr.attr, 413 &sensor_dev_attr_in1_input.dev_attr.attr, 414 &sensor_dev_attr_in2_input.dev_attr.attr, 415 &sensor_dev_attr_in3_input.dev_attr.attr, 416 &sensor_dev_attr_in4_input.dev_attr.attr, 417 &sensor_dev_attr_in5_input.dev_attr.attr, 418 &sensor_dev_attr_in6_input.dev_attr.attr, 419 &sensor_dev_attr_fan1_min.dev_attr.attr, 420 &sensor_dev_attr_fan2_min.dev_attr.attr, 421 &sensor_dev_attr_fan1_input.dev_attr.attr, 422 &sensor_dev_attr_fan2_input.dev_attr.attr, 423 &sensor_dev_attr_fan1_div.dev_attr.attr, 424 &sensor_dev_attr_fan2_div.dev_attr.attr, 425 &dev_attr_temp1_input.attr, 426 &dev_attr_temp1_max.attr, 427 &dev_attr_temp1_max_hyst.attr, 428 &dev_attr_temp1_crit.attr, 429 &dev_attr_temp1_crit_hyst.attr, 430 &dev_attr_alarms.attr, 431 &sensor_dev_attr_in0_alarm.dev_attr.attr, 432 &sensor_dev_attr_in1_alarm.dev_attr.attr, 433 &sensor_dev_attr_in2_alarm.dev_attr.attr, 434 &sensor_dev_attr_in3_alarm.dev_attr.attr, 435 &sensor_dev_attr_in4_alarm.dev_attr.attr, 436 &sensor_dev_attr_in5_alarm.dev_attr.attr, 437 &sensor_dev_attr_in6_alarm.dev_attr.attr, 438 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 439 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 440 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, 441 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, 442 NULL 443 }; 444 445 static const struct attribute_group lm80_group = { 446 .attrs = lm80_attributes, 447 }; 448 449 /* Return 0 if detection is successful, -ENODEV otherwise */ 450 static int lm80_detect(struct i2c_client *client, int kind, 451 struct i2c_board_info *info) 452 { 453 struct i2c_adapter *adapter = client->adapter; 454 int i, cur; 455 456 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 457 return -ENODEV; 458 459 /* Now, we do the remaining detection. It is lousy. */ 460 if (lm80_read_value(client, LM80_REG_ALARM2) & 0xc0) 461 return -ENODEV; 462 for (i = 0x2a; i <= 0x3d; i++) { 463 cur = i2c_smbus_read_byte_data(client, i); 464 if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur) 465 || (i2c_smbus_read_byte_data(client, i + 0x80) != cur) 466 || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur)) 467 return -ENODEV; 468 } 469 470 strlcpy(info->type, "lm80", I2C_NAME_SIZE); 471 472 return 0; 473 } 474 475 static int lm80_probe(struct i2c_client *client, 476 const struct i2c_device_id *id) 477 { 478 struct lm80_data *data; 479 int err; 480 481 data = kzalloc(sizeof(struct lm80_data), GFP_KERNEL); 482 if (!data) { 483 err = -ENOMEM; 484 goto exit; 485 } 486 487 i2c_set_clientdata(client, data); 488 mutex_init(&data->update_lock); 489 490 /* Initialize the LM80 chip */ 491 lm80_init_client(client); 492 493 /* A few vars need to be filled upon startup */ 494 data->fan_min[0] = lm80_read_value(client, LM80_REG_FAN_MIN(1)); 495 data->fan_min[1] = lm80_read_value(client, LM80_REG_FAN_MIN(2)); 496 497 /* Register sysfs hooks */ 498 if ((err = sysfs_create_group(&client->dev.kobj, &lm80_group))) 499 goto error_free; 500 501 data->hwmon_dev = hwmon_device_register(&client->dev); 502 if (IS_ERR(data->hwmon_dev)) { 503 err = PTR_ERR(data->hwmon_dev); 504 goto error_remove; 505 } 506 507 return 0; 508 509 error_remove: 510 sysfs_remove_group(&client->dev.kobj, &lm80_group); 511 error_free: 512 kfree(data); 513 exit: 514 return err; 515 } 516 517 static int lm80_remove(struct i2c_client *client) 518 { 519 struct lm80_data *data = i2c_get_clientdata(client); 520 521 hwmon_device_unregister(data->hwmon_dev); 522 sysfs_remove_group(&client->dev.kobj, &lm80_group); 523 524 kfree(data); 525 return 0; 526 } 527 528 static int lm80_read_value(struct i2c_client *client, u8 reg) 529 { 530 return i2c_smbus_read_byte_data(client, reg); 531 } 532 533 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value) 534 { 535 return i2c_smbus_write_byte_data(client, reg, value); 536 } 537 538 /* Called when we have found a new LM80. */ 539 static void lm80_init_client(struct i2c_client *client) 540 { 541 /* Reset all except Watchdog values and last conversion values 542 This sets fan-divs to 2, among others. This makes most other 543 initializations unnecessary */ 544 lm80_write_value(client, LM80_REG_CONFIG, 0x80); 545 /* Set 11-bit temperature resolution */ 546 lm80_write_value(client, LM80_REG_RES, 0x08); 547 548 /* Start monitoring */ 549 lm80_write_value(client, LM80_REG_CONFIG, 0x01); 550 } 551 552 static struct lm80_data *lm80_update_device(struct device *dev) 553 { 554 struct i2c_client *client = to_i2c_client(dev); 555 struct lm80_data *data = i2c_get_clientdata(client); 556 int i; 557 558 mutex_lock(&data->update_lock); 559 560 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) { 561 dev_dbg(&client->dev, "Starting lm80 update\n"); 562 for (i = 0; i <= 6; i++) { 563 data->in[i] = 564 lm80_read_value(client, LM80_REG_IN(i)); 565 data->in_min[i] = 566 lm80_read_value(client, LM80_REG_IN_MIN(i)); 567 data->in_max[i] = 568 lm80_read_value(client, LM80_REG_IN_MAX(i)); 569 } 570 data->fan[0] = lm80_read_value(client, LM80_REG_FAN1); 571 data->fan_min[0] = 572 lm80_read_value(client, LM80_REG_FAN_MIN(1)); 573 data->fan[1] = lm80_read_value(client, LM80_REG_FAN2); 574 data->fan_min[1] = 575 lm80_read_value(client, LM80_REG_FAN_MIN(2)); 576 577 data->temp = 578 (lm80_read_value(client, LM80_REG_TEMP) << 8) | 579 (lm80_read_value(client, LM80_REG_RES) & 0xf0); 580 data->temp_os_max = 581 lm80_read_value(client, LM80_REG_TEMP_OS_MAX); 582 data->temp_os_hyst = 583 lm80_read_value(client, LM80_REG_TEMP_OS_HYST); 584 data->temp_hot_max = 585 lm80_read_value(client, LM80_REG_TEMP_HOT_MAX); 586 data->temp_hot_hyst = 587 lm80_read_value(client, LM80_REG_TEMP_HOT_HYST); 588 589 i = lm80_read_value(client, LM80_REG_FANDIV); 590 data->fan_div[0] = (i >> 2) & 0x03; 591 data->fan_div[1] = (i >> 4) & 0x03; 592 data->alarms = lm80_read_value(client, LM80_REG_ALARM1) + 593 (lm80_read_value(client, LM80_REG_ALARM2) << 8); 594 data->last_updated = jiffies; 595 data->valid = 1; 596 } 597 598 mutex_unlock(&data->update_lock); 599 600 return data; 601 } 602 603 static int __init sensors_lm80_init(void) 604 { 605 return i2c_add_driver(&lm80_driver); 606 } 607 608 static void __exit sensors_lm80_exit(void) 609 { 610 i2c_del_driver(&lm80_driver); 611 } 612 613 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " 614 "Philip Edelbrock <phil@netroedge.com>"); 615 MODULE_DESCRIPTION("LM80 driver"); 616 MODULE_LICENSE("GPL"); 617 618 module_init(sensors_lm80_init); 619 module_exit(sensors_lm80_exit); 620