tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel / drivers / hwmon / lm80.c
at v2.6.16-rc6 609 lines 21 kB view raw
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/err.h> 31 32/* Addresses to scan */ 33static unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 34 0x2d, 0x2e, 0x2f, I2C_CLIENT_END }; 35 36/* Insmod parameters */ 37I2C_CLIENT_INSMOD_1(lm80); 38 39/* Many LM80 constants specified below */ 40 41/* The LM80 registers */ 42#define LM80_REG_IN_MAX(nr) (0x2a + (nr) * 2) 43#define LM80_REG_IN_MIN(nr) (0x2b + (nr) * 2) 44#define LM80_REG_IN(nr) (0x20 + (nr)) 45 46#define LM80_REG_FAN1 0x28 47#define LM80_REG_FAN2 0x29 48#define LM80_REG_FAN_MIN(nr) (0x3b + (nr)) 49 50#define LM80_REG_TEMP 0x27 51#define LM80_REG_TEMP_HOT_MAX 0x38 52#define LM80_REG_TEMP_HOT_HYST 0x39 53#define LM80_REG_TEMP_OS_MAX 0x3a 54#define LM80_REG_TEMP_OS_HYST 0x3b 55 56#define LM80_REG_CONFIG 0x00 57#define LM80_REG_ALARM1 0x01 58#define LM80_REG_ALARM2 0x02 59#define LM80_REG_MASK1 0x03 60#define LM80_REG_MASK2 0x04 61#define LM80_REG_FANDIV 0x05 62#define LM80_REG_RES 0x06 63 64 65/* Conversions. Rounding and limit checking is only done on the TO_REG 66 variants. Note that you should be a bit careful with which arguments 67 these macros are called: arguments may be evaluated more than once. 68 Fixing this is just not worth it. */ 69 70#define IN_TO_REG(val) (SENSORS_LIMIT(((val)+5)/10,0,255)) 71#define IN_FROM_REG(val) ((val)*10) 72 73static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div) 74{ 75 if (rpm == 0) 76 return 255; 77 rpm = SENSORS_LIMIT(rpm, 1, 1000000); 78 return SENSORS_LIMIT((1350000 + rpm*div / 2) / (rpm*div), 1, 254); 79} 80 81#define FAN_FROM_REG(val,div) ((val)==0?-1:\ 82 (val)==255?0:1350000/((div)*(val))) 83 84static inline long TEMP_FROM_REG(u16 temp) 85{ 86 long res; 87 88 temp >>= 4; 89 if (temp < 0x0800) 90 res = 625 * (long) temp; 91 else 92 res = ((long) temp - 0x01000) * 625; 93 94 return res / 10; 95} 96 97#define TEMP_LIMIT_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*1000) 98 99#define TEMP_LIMIT_TO_REG(val) SENSORS_LIMIT((val)<0?\ 100 ((val)-500)/1000:((val)+500)/1000,0,255) 101 102#define DIV_FROM_REG(val) (1 << (val)) 103 104/* 105 * Client data (each client gets its own) 106 */ 107 108struct lm80_data { 109 struct i2c_client client; 110 struct class_device *class_dev; 111 struct semaphore update_lock; 112 char valid; /* !=0 if following fields are valid */ 113 unsigned long last_updated; /* In jiffies */ 114 115 u8 in[7]; /* Register value */ 116 u8 in_max[7]; /* Register value */ 117 u8 in_min[7]; /* Register value */ 118 u8 fan[2]; /* Register value */ 119 u8 fan_min[2]; /* Register value */ 120 u8 fan_div[2]; /* Register encoding, shifted right */ 121 u16 temp; /* Register values, shifted right */ 122 u8 temp_hot_max; /* Register value */ 123 u8 temp_hot_hyst; /* Register value */ 124 u8 temp_os_max; /* Register value */ 125 u8 temp_os_hyst; /* Register value */ 126 u16 alarms; /* Register encoding, combined */ 127}; 128 129/* 130 * Functions declaration 131 */ 132 133static int lm80_attach_adapter(struct i2c_adapter *adapter); 134static int lm80_detect(struct i2c_adapter *adapter, int address, int kind); 135static void lm80_init_client(struct i2c_client *client); 136static int lm80_detach_client(struct i2c_client *client); 137static struct lm80_data *lm80_update_device(struct device *dev); 138static int lm80_read_value(struct i2c_client *client, u8 reg); 139static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value); 140 141/* 142 * Driver data (common to all clients) 143 */ 144 145static struct i2c_driver lm80_driver = { 146 .driver = { 147 .name = "lm80", 148 }, 149 .id = I2C_DRIVERID_LM80, 150 .attach_adapter = lm80_attach_adapter, 151 .detach_client = lm80_detach_client, 152}; 153 154/* 155 * Sysfs stuff 156 */ 157 158#define show_in(suffix, value) \ 159static ssize_t show_in_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \ 160{ \ 161 struct lm80_data *data = lm80_update_device(dev); \ 162 return sprintf(buf, "%d\n", IN_FROM_REG(data->value)); \ 163} 164show_in(min0, in_min[0]); 165show_in(min1, in_min[1]); 166show_in(min2, in_min[2]); 167show_in(min3, in_min[3]); 168show_in(min4, in_min[4]); 169show_in(min5, in_min[5]); 170show_in(min6, in_min[6]); 171show_in(max0, in_max[0]); 172show_in(max1, in_max[1]); 173show_in(max2, in_max[2]); 174show_in(max3, in_max[3]); 175show_in(max4, in_max[4]); 176show_in(max5, in_max[5]); 177show_in(max6, in_max[6]); 178show_in(input0, in[0]); 179show_in(input1, in[1]); 180show_in(input2, in[2]); 181show_in(input3, in[3]); 182show_in(input4, in[4]); 183show_in(input5, in[5]); 184show_in(input6, in[6]); 185 186#define set_in(suffix, value, reg) \ 187static ssize_t set_in_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \ 188 size_t count) \ 189{ \ 190 struct i2c_client *client = to_i2c_client(dev); \ 191 struct lm80_data *data = i2c_get_clientdata(client); \ 192 long val = simple_strtol(buf, NULL, 10); \ 193 \ 194 down(&data->update_lock);\ 195 data->value = IN_TO_REG(val); \ 196 lm80_write_value(client, reg, data->value); \ 197 up(&data->update_lock);\ 198 return count; \ 199} 200set_in(min0, in_min[0], LM80_REG_IN_MIN(0)); 201set_in(min1, in_min[1], LM80_REG_IN_MIN(1)); 202set_in(min2, in_min[2], LM80_REG_IN_MIN(2)); 203set_in(min3, in_min[3], LM80_REG_IN_MIN(3)); 204set_in(min4, in_min[4], LM80_REG_IN_MIN(4)); 205set_in(min5, in_min[5], LM80_REG_IN_MIN(5)); 206set_in(min6, in_min[6], LM80_REG_IN_MIN(6)); 207set_in(max0, in_max[0], LM80_REG_IN_MAX(0)); 208set_in(max1, in_max[1], LM80_REG_IN_MAX(1)); 209set_in(max2, in_max[2], LM80_REG_IN_MAX(2)); 210set_in(max3, in_max[3], LM80_REG_IN_MAX(3)); 211set_in(max4, in_max[4], LM80_REG_IN_MAX(4)); 212set_in(max5, in_max[5], LM80_REG_IN_MAX(5)); 213set_in(max6, in_max[6], LM80_REG_IN_MAX(6)); 214 215#define show_fan(suffix, value, div) \ 216static ssize_t show_fan_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \ 217{ \ 218 struct lm80_data *data = lm80_update_device(dev); \ 219 return sprintf(buf, "%d\n", FAN_FROM_REG(data->value, \ 220 DIV_FROM_REG(data->div))); \ 221} 222show_fan(min1, fan_min[0], fan_div[0]); 223show_fan(min2, fan_min[1], fan_div[1]); 224show_fan(input1, fan[0], fan_div[0]); 225show_fan(input2, fan[1], fan_div[1]); 226 227#define show_fan_div(suffix, value) \ 228static ssize_t show_fan_div##suffix(struct device *dev, struct device_attribute *attr, char *buf) \ 229{ \ 230 struct lm80_data *data = lm80_update_device(dev); \ 231 return sprintf(buf, "%d\n", DIV_FROM_REG(data->value)); \ 232} 233show_fan_div(1, fan_div[0]); 234show_fan_div(2, fan_div[1]); 235 236#define set_fan(suffix, value, reg, div) \ 237static ssize_t set_fan_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \ 238 size_t count) \ 239{ \ 240 struct i2c_client *client = to_i2c_client(dev); \ 241 struct lm80_data *data = i2c_get_clientdata(client); \ 242 long val = simple_strtoul(buf, NULL, 10); \ 243 \ 244 down(&data->update_lock);\ 245 data->value = FAN_TO_REG(val, DIV_FROM_REG(data->div)); \ 246 lm80_write_value(client, reg, data->value); \ 247 up(&data->update_lock);\ 248 return count; \ 249} 250set_fan(min1, fan_min[0], LM80_REG_FAN_MIN(1), fan_div[0]); 251set_fan(min2, fan_min[1], LM80_REG_FAN_MIN(2), fan_div[1]); 252 253/* Note: we save and restore the fan minimum here, because its value is 254 determined in part by the fan divisor. This follows the principle of 255 least suprise; the user doesn't expect the fan minimum to change just 256 because the divisor changed. */ 257static ssize_t set_fan_div(struct device *dev, const char *buf, 258 size_t count, int nr) 259{ 260 struct i2c_client *client = to_i2c_client(dev); 261 struct lm80_data *data = i2c_get_clientdata(client); 262 unsigned long min, val = simple_strtoul(buf, NULL, 10); 263 u8 reg; 264 265 /* Save fan_min */ 266 down(&data->update_lock); 267 min = FAN_FROM_REG(data->fan_min[nr], 268 DIV_FROM_REG(data->fan_div[nr])); 269 270 switch (val) { 271 case 1: data->fan_div[nr] = 0; break; 272 case 2: data->fan_div[nr] = 1; break; 273 case 4: data->fan_div[nr] = 2; break; 274 case 8: data->fan_div[nr] = 3; break; 275 default: 276 dev_err(&client->dev, "fan_div value %ld not " 277 "supported. Choose one of 1, 2, 4 or 8!\n", val); 278 up(&data->update_lock); 279 return -EINVAL; 280 } 281 282 reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1)))) 283 | (data->fan_div[nr] << (2 * (nr + 1))); 284 lm80_write_value(client, LM80_REG_FANDIV, reg); 285 286 /* Restore fan_min */ 287 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr])); 288 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]); 289 up(&data->update_lock); 290 291 return count; 292} 293 294#define set_fan_div(number) \ 295static ssize_t set_fan_div##number(struct device *dev, struct device_attribute *attr, const char *buf, \ 296 size_t count) \ 297{ \ 298 return set_fan_div(dev, buf, count, number - 1); \ 299} 300set_fan_div(1); 301set_fan_div(2); 302 303static ssize_t show_temp_input1(struct device *dev, struct device_attribute *attr, char *buf) 304{ 305 struct lm80_data *data = lm80_update_device(dev); 306 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp)); 307} 308 309#define show_temp(suffix, value) \ 310static ssize_t show_temp_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \ 311{ \ 312 struct lm80_data *data = lm80_update_device(dev); \ 313 return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \ 314} 315show_temp(hot_max, temp_hot_max); 316show_temp(hot_hyst, temp_hot_hyst); 317show_temp(os_max, temp_os_max); 318show_temp(os_hyst, temp_os_hyst); 319 320#define set_temp(suffix, value, reg) \ 321static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \ 322 size_t count) \ 323{ \ 324 struct i2c_client *client = to_i2c_client(dev); \ 325 struct lm80_data *data = i2c_get_clientdata(client); \ 326 long val = simple_strtoul(buf, NULL, 10); \ 327 \ 328 down(&data->update_lock); \ 329 data->value = TEMP_LIMIT_TO_REG(val); \ 330 lm80_write_value(client, reg, data->value); \ 331 up(&data->update_lock); \ 332 return count; \ 333} 334set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX); 335set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST); 336set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX); 337set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST); 338 339static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) 340{ 341 struct lm80_data *data = lm80_update_device(dev); 342 return sprintf(buf, "%u\n", data->alarms); 343} 344 345static DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min0, set_in_min0); 346static DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min1, set_in_min1); 347static DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min2, set_in_min2); 348static DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO, show_in_min3, set_in_min3); 349static DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO, show_in_min4, set_in_min4); 350static DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO, show_in_min5, set_in_min5); 351static DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO, show_in_min6, set_in_min6); 352static DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max0, set_in_max0); 353static DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max1, set_in_max1); 354static DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max2, set_in_max2); 355static DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO, show_in_max3, set_in_max3); 356static DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO, show_in_max4, set_in_max4); 357static DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO, show_in_max5, set_in_max5); 358static DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO, show_in_max6, set_in_max6); 359static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL); 360static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL); 361static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL); 362static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL); 363static DEVICE_ATTR(in4_input, S_IRUGO, show_in_input4, NULL); 364static DEVICE_ATTR(in5_input, S_IRUGO, show_in_input5, NULL); 365static DEVICE_ATTR(in6_input, S_IRUGO, show_in_input6, NULL); 366static DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min1, 367 set_fan_min1); 368static DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min2, 369 set_fan_min2); 370static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input1, NULL); 371static DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input2, NULL); 372static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div1, set_fan_div1); 373static DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div2, set_fan_div2); 374static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL); 375static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max, 376 set_temp_hot_max); 377static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst, 378 set_temp_hot_hyst); 379static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max, 380 set_temp_os_max); 381static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst, 382 set_temp_os_hyst); 383static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 384 385/* 386 * Real code 387 */ 388 389static int lm80_attach_adapter(struct i2c_adapter *adapter) 390{ 391 if (!(adapter->class & I2C_CLASS_HWMON)) 392 return 0; 393 return i2c_probe(adapter, &addr_data, lm80_detect); 394} 395 396static int lm80_detect(struct i2c_adapter *adapter, int address, int kind) 397{ 398 int i, cur; 399 struct i2c_client *new_client; 400 struct lm80_data *data; 401 int err = 0; 402 const char *name; 403 404 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 405 goto exit; 406 407 /* OK. For now, we presume we have a valid client. We now create the 408 client structure, even though we cannot fill it completely yet. 409 But it allows us to access lm80_{read,write}_value. */ 410 if (!(data = kzalloc(sizeof(struct lm80_data), GFP_KERNEL))) { 411 err = -ENOMEM; 412 goto exit; 413 } 414 415 new_client = &data->client; 416 i2c_set_clientdata(new_client, data); 417 new_client->addr = address; 418 new_client->adapter = adapter; 419 new_client->driver = &lm80_driver; 420 new_client->flags = 0; 421 422 /* Now, we do the remaining detection. It is lousy. */ 423 if (lm80_read_value(new_client, LM80_REG_ALARM2) & 0xc0) 424 goto error_free; 425 for (i = 0x2a; i <= 0x3d; i++) { 426 cur = i2c_smbus_read_byte_data(new_client, i); 427 if ((i2c_smbus_read_byte_data(new_client, i + 0x40) != cur) 428 || (i2c_smbus_read_byte_data(new_client, i + 0x80) != cur) 429 || (i2c_smbus_read_byte_data(new_client, i + 0xc0) != cur)) 430 goto error_free; 431 } 432 433 /* Determine the chip type - only one kind supported! */ 434 kind = lm80; 435 name = "lm80"; 436 437 /* Fill in the remaining client fields and put it into the global list */ 438 strlcpy(new_client->name, name, I2C_NAME_SIZE); 439 data->valid = 0; 440 init_MUTEX(&data->update_lock); 441 442 /* Tell the I2C layer a new client has arrived */ 443 if ((err = i2c_attach_client(new_client))) 444 goto error_free; 445 446 /* Initialize the LM80 chip */ 447 lm80_init_client(new_client); 448 449 /* A few vars need to be filled upon startup */ 450 data->fan_min[0] = lm80_read_value(new_client, LM80_REG_FAN_MIN(1)); 451 data->fan_min[1] = lm80_read_value(new_client, LM80_REG_FAN_MIN(2)); 452 453 /* Register sysfs hooks */ 454 data->class_dev = hwmon_device_register(&new_client->dev); 455 if (IS_ERR(data->class_dev)) { 456 err = PTR_ERR(data->class_dev); 457 goto error_detach; 458 } 459 460 device_create_file(&new_client->dev, &dev_attr_in0_min); 461 device_create_file(&new_client->dev, &dev_attr_in1_min); 462 device_create_file(&new_client->dev, &dev_attr_in2_min); 463 device_create_file(&new_client->dev, &dev_attr_in3_min); 464 device_create_file(&new_client->dev, &dev_attr_in4_min); 465 device_create_file(&new_client->dev, &dev_attr_in5_min); 466 device_create_file(&new_client->dev, &dev_attr_in6_min); 467 device_create_file(&new_client->dev, &dev_attr_in0_max); 468 device_create_file(&new_client->dev, &dev_attr_in1_max); 469 device_create_file(&new_client->dev, &dev_attr_in2_max); 470 device_create_file(&new_client->dev, &dev_attr_in3_max); 471 device_create_file(&new_client->dev, &dev_attr_in4_max); 472 device_create_file(&new_client->dev, &dev_attr_in5_max); 473 device_create_file(&new_client->dev, &dev_attr_in6_max); 474 device_create_file(&new_client->dev, &dev_attr_in0_input); 475 device_create_file(&new_client->dev, &dev_attr_in1_input); 476 device_create_file(&new_client->dev, &dev_attr_in2_input); 477 device_create_file(&new_client->dev, &dev_attr_in3_input); 478 device_create_file(&new_client->dev, &dev_attr_in4_input); 479 device_create_file(&new_client->dev, &dev_attr_in5_input); 480 device_create_file(&new_client->dev, &dev_attr_in6_input); 481 device_create_file(&new_client->dev, &dev_attr_fan1_min); 482 device_create_file(&new_client->dev, &dev_attr_fan2_min); 483 device_create_file(&new_client->dev, &dev_attr_fan1_input); 484 device_create_file(&new_client->dev, &dev_attr_fan2_input); 485 device_create_file(&new_client->dev, &dev_attr_fan1_div); 486 device_create_file(&new_client->dev, &dev_attr_fan2_div); 487 device_create_file(&new_client->dev, &dev_attr_temp1_input); 488 device_create_file(&new_client->dev, &dev_attr_temp1_max); 489 device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst); 490 device_create_file(&new_client->dev, &dev_attr_temp1_crit); 491 device_create_file(&new_client->dev, &dev_attr_temp1_crit_hyst); 492 device_create_file(&new_client->dev, &dev_attr_alarms); 493 494 return 0; 495 496error_detach: 497 i2c_detach_client(new_client); 498error_free: 499 kfree(data); 500exit: 501 return err; 502} 503 504static int lm80_detach_client(struct i2c_client *client) 505{ 506 struct lm80_data *data = i2c_get_clientdata(client); 507 int err; 508 509 hwmon_device_unregister(data->class_dev); 510 511 if ((err = i2c_detach_client(client))) 512 return err; 513 514 kfree(data); 515 return 0; 516} 517 518static int lm80_read_value(struct i2c_client *client, u8 reg) 519{ 520 return i2c_smbus_read_byte_data(client, reg); 521} 522 523static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value) 524{ 525 return i2c_smbus_write_byte_data(client, reg, value); 526} 527 528/* Called when we have found a new LM80. */ 529static void lm80_init_client(struct i2c_client *client) 530{ 531 /* Reset all except Watchdog values and last conversion values 532 This sets fan-divs to 2, among others. This makes most other 533 initializations unnecessary */ 534 lm80_write_value(client, LM80_REG_CONFIG, 0x80); 535 /* Set 11-bit temperature resolution */ 536 lm80_write_value(client, LM80_REG_RES, 0x08); 537 538 /* Start monitoring */ 539 lm80_write_value(client, LM80_REG_CONFIG, 0x01); 540} 541 542static struct lm80_data *lm80_update_device(struct device *dev) 543{ 544 struct i2c_client *client = to_i2c_client(dev); 545 struct lm80_data *data = i2c_get_clientdata(client); 546 int i; 547 548 down(&data->update_lock); 549 550 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) { 551 dev_dbg(&client->dev, "Starting lm80 update\n"); 552 for (i = 0; i <= 6; i++) { 553 data->in[i] = 554 lm80_read_value(client, LM80_REG_IN(i)); 555 data->in_min[i] = 556 lm80_read_value(client, LM80_REG_IN_MIN(i)); 557 data->in_max[i] = 558 lm80_read_value(client, LM80_REG_IN_MAX(i)); 559 } 560 data->fan[0] = lm80_read_value(client, LM80_REG_FAN1); 561 data->fan_min[0] = 562 lm80_read_value(client, LM80_REG_FAN_MIN(1)); 563 data->fan[1] = lm80_read_value(client, LM80_REG_FAN2); 564 data->fan_min[1] = 565 lm80_read_value(client, LM80_REG_FAN_MIN(2)); 566 567 data->temp = 568 (lm80_read_value(client, LM80_REG_TEMP) << 8) | 569 (lm80_read_value(client, LM80_REG_RES) & 0xf0); 570 data->temp_os_max = 571 lm80_read_value(client, LM80_REG_TEMP_OS_MAX); 572 data->temp_os_hyst = 573 lm80_read_value(client, LM80_REG_TEMP_OS_HYST); 574 data->temp_hot_max = 575 lm80_read_value(client, LM80_REG_TEMP_HOT_MAX); 576 data->temp_hot_hyst = 577 lm80_read_value(client, LM80_REG_TEMP_HOT_HYST); 578 579 i = lm80_read_value(client, LM80_REG_FANDIV); 580 data->fan_div[0] = (i >> 2) & 0x03; 581 data->fan_div[1] = (i >> 4) & 0x03; 582 data->alarms = lm80_read_value(client, LM80_REG_ALARM1) + 583 (lm80_read_value(client, LM80_REG_ALARM2) << 8); 584 data->last_updated = jiffies; 585 data->valid = 1; 586 } 587 588 up(&data->update_lock); 589 590 return data; 591} 592 593static int __init sensors_lm80_init(void) 594{ 595 return i2c_add_driver(&lm80_driver); 596} 597 598static void __exit sensors_lm80_exit(void) 599{ 600 i2c_del_driver(&lm80_driver); 601} 602 603MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " 604 "Philip Edelbrock <phil@netroedge.com>"); 605MODULE_DESCRIPTION("LM80 driver"); 606MODULE_LICENSE("GPL"); 607 608module_init(sensors_lm80_init); 609module_exit(sensors_lm80_exit);