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/i2c-sensor.h> 30 31 /* Addresses to scan */ 32 static unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 33 0x2d, 0x2e, 0x2f, I2C_CLIENT_END }; 34 static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END }; 35 36 /* Insmod parameters */ 37 SENSORS_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 73 static 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 84 static 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 */ 107 108 struct lm80_data { 109 struct i2c_client client; 110 struct semaphore update_lock; 111 char valid; /* !=0 if following fields are valid */ 112 unsigned long last_updated; /* In jiffies */ 113 114 u8 in[7]; /* Register value */ 115 u8 in_max[7]; /* Register value */ 116 u8 in_min[7]; /* Register value */ 117 u8 fan[2]; /* Register value */ 118 u8 fan_min[2]; /* Register value */ 119 u8 fan_div[2]; /* Register encoding, shifted right */ 120 u16 temp; /* Register values, shifted right */ 121 u8 temp_hot_max; /* Register value */ 122 u8 temp_hot_hyst; /* Register value */ 123 u8 temp_os_max; /* Register value */ 124 u8 temp_os_hyst; /* Register value */ 125 u16 alarms; /* Register encoding, combined */ 126 }; 127 128 /* 129 * Functions declaration 130 */ 131 132 static int lm80_attach_adapter(struct i2c_adapter *adapter); 133 static int lm80_detect(struct i2c_adapter *adapter, int address, int kind); 134 static void lm80_init_client(struct i2c_client *client); 135 static int lm80_detach_client(struct i2c_client *client); 136 static struct lm80_data *lm80_update_device(struct device *dev); 137 static int lm80_read_value(struct i2c_client *client, u8 reg); 138 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value); 139 140 /* 141 * Driver data (common to all clients) 142 */ 143 144 static struct i2c_driver lm80_driver = { 145 .owner = THIS_MODULE, 146 .name = "lm80", 147 .id = I2C_DRIVERID_LM80, 148 .flags = I2C_DF_NOTIFY, 149 .attach_adapter = lm80_attach_adapter, 150 .detach_client = lm80_detach_client, 151 }; 152 153 /* 154 * Sysfs stuff 155 */ 156 157 #define show_in(suffix, value) \ 158 static ssize_t show_in_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \ 159 { \ 160 struct lm80_data *data = lm80_update_device(dev); \ 161 return sprintf(buf, "%d\n", IN_FROM_REG(data->value)); \ 162 } 163 show_in(min0, in_min[0]); 164 show_in(min1, in_min[1]); 165 show_in(min2, in_min[2]); 166 show_in(min3, in_min[3]); 167 show_in(min4, in_min[4]); 168 show_in(min5, in_min[5]); 169 show_in(min6, in_min[6]); 170 show_in(max0, in_max[0]); 171 show_in(max1, in_max[1]); 172 show_in(max2, in_max[2]); 173 show_in(max3, in_max[3]); 174 show_in(max4, in_max[4]); 175 show_in(max5, in_max[5]); 176 show_in(max6, in_max[6]); 177 show_in(input0, in[0]); 178 show_in(input1, in[1]); 179 show_in(input2, in[2]); 180 show_in(input3, in[3]); 181 show_in(input4, in[4]); 182 show_in(input5, in[5]); 183 show_in(input6, in[6]); 184 185 #define set_in(suffix, value, reg) \ 186 static ssize_t set_in_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \ 187 size_t count) \ 188 { \ 189 struct i2c_client *client = to_i2c_client(dev); \ 190 struct lm80_data *data = i2c_get_clientdata(client); \ 191 long val = simple_strtol(buf, NULL, 10); \ 192 \ 193 down(&data->update_lock);\ 194 data->value = IN_TO_REG(val); \ 195 lm80_write_value(client, reg, data->value); \ 196 up(&data->update_lock);\ 197 return count; \ 198 } 199 set_in(min0, in_min[0], LM80_REG_IN_MIN(0)); 200 set_in(min1, in_min[1], LM80_REG_IN_MIN(1)); 201 set_in(min2, in_min[2], LM80_REG_IN_MIN(2)); 202 set_in(min3, in_min[3], LM80_REG_IN_MIN(3)); 203 set_in(min4, in_min[4], LM80_REG_IN_MIN(4)); 204 set_in(min5, in_min[5], LM80_REG_IN_MIN(5)); 205 set_in(min6, in_min[6], LM80_REG_IN_MIN(6)); 206 set_in(max0, in_max[0], LM80_REG_IN_MAX(0)); 207 set_in(max1, in_max[1], LM80_REG_IN_MAX(1)); 208 set_in(max2, in_max[2], LM80_REG_IN_MAX(2)); 209 set_in(max3, in_max[3], LM80_REG_IN_MAX(3)); 210 set_in(max4, in_max[4], LM80_REG_IN_MAX(4)); 211 set_in(max5, in_max[5], LM80_REG_IN_MAX(5)); 212 set_in(max6, in_max[6], LM80_REG_IN_MAX(6)); 213 214 #define show_fan(suffix, value, div) \ 215 static ssize_t show_fan_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \ 216 { \ 217 struct lm80_data *data = lm80_update_device(dev); \ 218 return sprintf(buf, "%d\n", FAN_FROM_REG(data->value, \ 219 DIV_FROM_REG(data->div))); \ 220 } 221 show_fan(min1, fan_min[0], fan_div[0]); 222 show_fan(min2, fan_min[1], fan_div[1]); 223 show_fan(input1, fan[0], fan_div[0]); 224 show_fan(input2, fan[1], fan_div[1]); 225 226 #define show_fan_div(suffix, value) \ 227 static ssize_t show_fan_div##suffix(struct device *dev, struct device_attribute *attr, char *buf) \ 228 { \ 229 struct lm80_data *data = lm80_update_device(dev); \ 230 return sprintf(buf, "%d\n", DIV_FROM_REG(data->value)); \ 231 } 232 show_fan_div(1, fan_div[0]); 233 show_fan_div(2, fan_div[1]); 234 235 #define set_fan(suffix, value, reg, div) \ 236 static ssize_t set_fan_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \ 237 size_t count) \ 238 { \ 239 struct i2c_client *client = to_i2c_client(dev); \ 240 struct lm80_data *data = i2c_get_clientdata(client); \ 241 long val = simple_strtoul(buf, NULL, 10); \ 242 \ 243 down(&data->update_lock);\ 244 data->value = FAN_TO_REG(val, DIV_FROM_REG(data->div)); \ 245 lm80_write_value(client, reg, data->value); \ 246 up(&data->update_lock);\ 247 return count; \ 248 } 249 set_fan(min1, fan_min[0], LM80_REG_FAN_MIN(1), fan_div[0]); 250 set_fan(min2, fan_min[1], LM80_REG_FAN_MIN(2), fan_div[1]); 251 252 /* Note: we save and restore the fan minimum here, because its value is 253 determined in part by the fan divisor. This follows the principle of 254 least suprise; the user doesn't expect the fan minimum to change just 255 because the divisor changed. */ 256 static ssize_t set_fan_div(struct device *dev, const char *buf, 257 size_t count, int nr) 258 { 259 struct i2c_client *client = to_i2c_client(dev); 260 struct lm80_data *data = i2c_get_clientdata(client); 261 unsigned long min, val = simple_strtoul(buf, NULL, 10); 262 u8 reg; 263 264 /* Save fan_min */ 265 down(&data->update_lock); 266 min = FAN_FROM_REG(data->fan_min[nr], 267 DIV_FROM_REG(data->fan_div[nr])); 268 269 switch (val) { 270 case 1: data->fan_div[nr] = 0; break; 271 case 2: data->fan_div[nr] = 1; break; 272 case 4: data->fan_div[nr] = 2; break; 273 case 8: data->fan_div[nr] = 3; break; 274 default: 275 dev_err(&client->dev, "fan_div value %ld not " 276 "supported. Choose one of 1, 2, 4 or 8!\n", val); 277 up(&data->update_lock); 278 return -EINVAL; 279 } 280 281 reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1)))) 282 | (data->fan_div[nr] << (2 * (nr + 1))); 283 lm80_write_value(client, LM80_REG_FANDIV, reg); 284 285 /* Restore fan_min */ 286 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr])); 287 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]); 288 up(&data->update_lock); 289 290 return count; 291 } 292 293 #define set_fan_div(number) \ 294 static ssize_t set_fan_div##number(struct device *dev, struct device_attribute *attr, const char *buf, \ 295 size_t count) \ 296 { \ 297 return set_fan_div(dev, buf, count, number - 1); \ 298 } 299 set_fan_div(1); 300 set_fan_div(2); 301 302 static ssize_t show_temp_input1(struct device *dev, struct device_attribute *attr, char *buf) 303 { 304 struct lm80_data *data = lm80_update_device(dev); 305 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp)); 306 } 307 308 #define show_temp(suffix, value) \ 309 static ssize_t show_temp_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \ 310 { \ 311 struct lm80_data *data = lm80_update_device(dev); \ 312 return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \ 313 } 314 show_temp(hot_max, temp_hot_max); 315 show_temp(hot_hyst, temp_hot_hyst); 316 show_temp(os_max, temp_os_max); 317 show_temp(os_hyst, temp_os_hyst); 318 319 #define set_temp(suffix, value, reg) \ 320 static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \ 321 size_t count) \ 322 { \ 323 struct i2c_client *client = to_i2c_client(dev); \ 324 struct lm80_data *data = i2c_get_clientdata(client); \ 325 long val = simple_strtoul(buf, NULL, 10); \ 326 \ 327 down(&data->update_lock); \ 328 data->value = TEMP_LIMIT_TO_REG(val); \ 329 lm80_write_value(client, reg, data->value); \ 330 up(&data->update_lock); \ 331 return count; \ 332 } 333 set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX); 334 set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST); 335 set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX); 336 set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST); 337 338 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) 339 { 340 struct lm80_data *data = lm80_update_device(dev); 341 return sprintf(buf, "%u\n", data->alarms); 342 } 343 344 static DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min0, set_in_min0); 345 static DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min1, set_in_min1); 346 static DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min2, set_in_min2); 347 static DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO, show_in_min3, set_in_min3); 348 static DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO, show_in_min4, set_in_min4); 349 static DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO, show_in_min5, set_in_min5); 350 static DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO, show_in_min6, set_in_min6); 351 static DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max0, set_in_max0); 352 static DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max1, set_in_max1); 353 static DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max2, set_in_max2); 354 static DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO, show_in_max3, set_in_max3); 355 static DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO, show_in_max4, set_in_max4); 356 static DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO, show_in_max5, set_in_max5); 357 static DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO, show_in_max6, set_in_max6); 358 static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL); 359 static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL); 360 static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL); 361 static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL); 362 static DEVICE_ATTR(in4_input, S_IRUGO, show_in_input4, NULL); 363 static DEVICE_ATTR(in5_input, S_IRUGO, show_in_input5, NULL); 364 static DEVICE_ATTR(in6_input, S_IRUGO, show_in_input6, NULL); 365 static DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min1, 366 set_fan_min1); 367 static DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min2, 368 set_fan_min2); 369 static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input1, NULL); 370 static DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input2, NULL); 371 static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div1, set_fan_div1); 372 static DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div2, set_fan_div2); 373 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL); 374 static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max, 375 set_temp_hot_max); 376 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst, 377 set_temp_hot_hyst); 378 static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max, 379 set_temp_os_max); 380 static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst, 381 set_temp_os_hyst); 382 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 383 384 /* 385 * Real code 386 */ 387 388 static int lm80_attach_adapter(struct i2c_adapter *adapter) 389 { 390 if (!(adapter->class & I2C_CLASS_HWMON)) 391 return 0; 392 return i2c_detect(adapter, &addr_data, lm80_detect); 393 } 394 395 int lm80_detect(struct i2c_adapter *adapter, int address, int kind) 396 { 397 int i, cur; 398 struct i2c_client *new_client; 399 struct lm80_data *data; 400 int err = 0; 401 const char *name; 402 403 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 404 goto exit; 405 406 /* OK. For now, we presume we have a valid client. We now create the 407 client structure, even though we cannot fill it completely yet. 408 But it allows us to access lm80_{read,write}_value. */ 409 if (!(data = kmalloc(sizeof(struct lm80_data), GFP_KERNEL))) { 410 err = -ENOMEM; 411 goto exit; 412 } 413 memset(data, 0, sizeof(struct lm80_data)); 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 device_create_file(&new_client->dev, &dev_attr_in0_min); 455 device_create_file(&new_client->dev, &dev_attr_in1_min); 456 device_create_file(&new_client->dev, &dev_attr_in2_min); 457 device_create_file(&new_client->dev, &dev_attr_in3_min); 458 device_create_file(&new_client->dev, &dev_attr_in4_min); 459 device_create_file(&new_client->dev, &dev_attr_in5_min); 460 device_create_file(&new_client->dev, &dev_attr_in6_min); 461 device_create_file(&new_client->dev, &dev_attr_in0_max); 462 device_create_file(&new_client->dev, &dev_attr_in1_max); 463 device_create_file(&new_client->dev, &dev_attr_in2_max); 464 device_create_file(&new_client->dev, &dev_attr_in3_max); 465 device_create_file(&new_client->dev, &dev_attr_in4_max); 466 device_create_file(&new_client->dev, &dev_attr_in5_max); 467 device_create_file(&new_client->dev, &dev_attr_in6_max); 468 device_create_file(&new_client->dev, &dev_attr_in0_input); 469 device_create_file(&new_client->dev, &dev_attr_in1_input); 470 device_create_file(&new_client->dev, &dev_attr_in2_input); 471 device_create_file(&new_client->dev, &dev_attr_in3_input); 472 device_create_file(&new_client->dev, &dev_attr_in4_input); 473 device_create_file(&new_client->dev, &dev_attr_in5_input); 474 device_create_file(&new_client->dev, &dev_attr_in6_input); 475 device_create_file(&new_client->dev, &dev_attr_fan1_min); 476 device_create_file(&new_client->dev, &dev_attr_fan2_min); 477 device_create_file(&new_client->dev, &dev_attr_fan1_input); 478 device_create_file(&new_client->dev, &dev_attr_fan2_input); 479 device_create_file(&new_client->dev, &dev_attr_fan1_div); 480 device_create_file(&new_client->dev, &dev_attr_fan2_div); 481 device_create_file(&new_client->dev, &dev_attr_temp1_input); 482 device_create_file(&new_client->dev, &dev_attr_temp1_max); 483 device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst); 484 device_create_file(&new_client->dev, &dev_attr_temp1_crit); 485 device_create_file(&new_client->dev, &dev_attr_temp1_crit_hyst); 486 device_create_file(&new_client->dev, &dev_attr_alarms); 487 488 return 0; 489 490 error_free: 491 kfree(data); 492 exit: 493 return err; 494 } 495 496 static int lm80_detach_client(struct i2c_client *client) 497 { 498 int err; 499 500 if ((err = i2c_detach_client(client))) { 501 dev_err(&client->dev, "Client deregistration failed, " 502 "client not detached.\n"); 503 return err; 504 } 505 506 kfree(i2c_get_clientdata(client)); 507 return 0; 508 } 509 510 static int lm80_read_value(struct i2c_client *client, u8 reg) 511 { 512 return i2c_smbus_read_byte_data(client, reg); 513 } 514 515 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value) 516 { 517 return i2c_smbus_write_byte_data(client, reg, value); 518 } 519 520 /* Called when we have found a new LM80. */ 521 static void lm80_init_client(struct i2c_client *client) 522 { 523 /* Reset all except Watchdog values and last conversion values 524 This sets fan-divs to 2, among others. This makes most other 525 initializations unnecessary */ 526 lm80_write_value(client, LM80_REG_CONFIG, 0x80); 527 /* Set 11-bit temperature resolution */ 528 lm80_write_value(client, LM80_REG_RES, 0x08); 529 530 /* Start monitoring */ 531 lm80_write_value(client, LM80_REG_CONFIG, 0x01); 532 } 533 534 static struct lm80_data *lm80_update_device(struct device *dev) 535 { 536 struct i2c_client *client = to_i2c_client(dev); 537 struct lm80_data *data = i2c_get_clientdata(client); 538 int i; 539 540 down(&data->update_lock); 541 542 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) { 543 dev_dbg(&client->dev, "Starting lm80 update\n"); 544 for (i = 0; i <= 6; i++) { 545 data->in[i] = 546 lm80_read_value(client, LM80_REG_IN(i)); 547 data->in_min[i] = 548 lm80_read_value(client, LM80_REG_IN_MIN(i)); 549 data->in_max[i] = 550 lm80_read_value(client, LM80_REG_IN_MAX(i)); 551 } 552 data->fan[0] = lm80_read_value(client, LM80_REG_FAN1); 553 data->fan_min[0] = 554 lm80_read_value(client, LM80_REG_FAN_MIN(1)); 555 data->fan[1] = lm80_read_value(client, LM80_REG_FAN2); 556 data->fan_min[1] = 557 lm80_read_value(client, LM80_REG_FAN_MIN(2)); 558 559 data->temp = 560 (lm80_read_value(client, LM80_REG_TEMP) << 8) | 561 (lm80_read_value(client, LM80_REG_RES) & 0xf0); 562 data->temp_os_max = 563 lm80_read_value(client, LM80_REG_TEMP_OS_MAX); 564 data->temp_os_hyst = 565 lm80_read_value(client, LM80_REG_TEMP_OS_HYST); 566 data->temp_hot_max = 567 lm80_read_value(client, LM80_REG_TEMP_HOT_MAX); 568 data->temp_hot_hyst = 569 lm80_read_value(client, LM80_REG_TEMP_HOT_HYST); 570 571 i = lm80_read_value(client, LM80_REG_FANDIV); 572 data->fan_div[0] = (i >> 2) & 0x03; 573 data->fan_div[1] = (i >> 4) & 0x03; 574 data->alarms = lm80_read_value(client, LM80_REG_ALARM1) + 575 (lm80_read_value(client, LM80_REG_ALARM2) << 8); 576 data->last_updated = jiffies; 577 data->valid = 1; 578 } 579 580 up(&data->update_lock); 581 582 return data; 583 } 584 585 static int __init sensors_lm80_init(void) 586 { 587 return i2c_add_driver(&lm80_driver); 588 } 589 590 static void __exit sensors_lm80_exit(void) 591 { 592 i2c_del_driver(&lm80_driver); 593 } 594 595 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " 596 "Philip Edelbrock <phil@netroedge.com>"); 597 MODULE_DESCRIPTION("LM80 driver"); 598 MODULE_LICENSE("GPL"); 599 600 module_init(sensors_lm80_init); 601 module_exit(sensors_lm80_exit); 602