1 /* 2 * adm1029.c - Part of lm_sensors, Linux kernel modules for hardware monitoring 3 * 4 * Copyright (C) 2006 Corentin LABBE <corentin.labbe@geomatys.fr> 5 * 6 * Based on LM83 Driver by Jean Delvare <khali@linux-fr.org> 7 * 8 * Give only processor, motherboard temperatures and fan tachs 9 * Very rare chip please let me know if you use it 10 * 11 * http://www.analog.com/UploadedFiles/Data_Sheets/ADM1029.pdf 12 * 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation version 2 of the License 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 26 */ 27 28 #include <linux/module.h> 29 #include <linux/init.h> 30 #include <linux/slab.h> 31 #include <linux/jiffies.h> 32 #include <linux/i2c.h> 33 #include <linux/hwmon-sysfs.h> 34 #include <linux/hwmon.h> 35 #include <linux/err.h> 36 #include <linux/mutex.h> 37 38 /* 39 * Addresses to scan 40 */ 41 42 static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 43 0x2e, 0x2f, I2C_CLIENT_END 44 }; 45 46 /* 47 * The ADM1029 registers 48 * Manufacturer ID is 0x41 for Analog Devices 49 */ 50 51 #define ADM1029_REG_MAN_ID 0x0D 52 #define ADM1029_REG_CHIP_ID 0x0E 53 #define ADM1029_REG_CONFIG 0x01 54 #define ADM1029_REG_NB_FAN_SUPPORT 0x02 55 56 #define ADM1029_REG_TEMP_DEVICES_INSTALLED 0x06 57 58 #define ADM1029_REG_LOCAL_TEMP 0xA0 59 #define ADM1029_REG_REMOTE1_TEMP 0xA1 60 #define ADM1029_REG_REMOTE2_TEMP 0xA2 61 62 #define ADM1029_REG_LOCAL_TEMP_HIGH 0x90 63 #define ADM1029_REG_REMOTE1_TEMP_HIGH 0x91 64 #define ADM1029_REG_REMOTE2_TEMP_HIGH 0x92 65 66 #define ADM1029_REG_LOCAL_TEMP_LOW 0x98 67 #define ADM1029_REG_REMOTE1_TEMP_LOW 0x99 68 #define ADM1029_REG_REMOTE2_TEMP_LOW 0x9A 69 70 #define ADM1029_REG_FAN1 0x70 71 #define ADM1029_REG_FAN2 0x71 72 73 #define ADM1029_REG_FAN1_MIN 0x78 74 #define ADM1029_REG_FAN2_MIN 0x79 75 76 #define ADM1029_REG_FAN1_CONFIG 0x68 77 #define ADM1029_REG_FAN2_CONFIG 0x69 78 79 #define TEMP_FROM_REG(val) ((val) * 1000) 80 81 #define DIV_FROM_REG(val) ( 1 << (((val) >> 6) - 1)) 82 83 /* Registers to be checked by adm1029_update_device() */ 84 static const u8 ADM1029_REG_TEMP[] = { 85 ADM1029_REG_LOCAL_TEMP, 86 ADM1029_REG_REMOTE1_TEMP, 87 ADM1029_REG_REMOTE2_TEMP, 88 ADM1029_REG_LOCAL_TEMP_HIGH, 89 ADM1029_REG_REMOTE1_TEMP_HIGH, 90 ADM1029_REG_REMOTE2_TEMP_HIGH, 91 ADM1029_REG_LOCAL_TEMP_LOW, 92 ADM1029_REG_REMOTE1_TEMP_LOW, 93 ADM1029_REG_REMOTE2_TEMP_LOW, 94 }; 95 96 static const u8 ADM1029_REG_FAN[] = { 97 ADM1029_REG_FAN1, 98 ADM1029_REG_FAN2, 99 ADM1029_REG_FAN1_MIN, 100 ADM1029_REG_FAN2_MIN, 101 }; 102 103 static const u8 ADM1029_REG_FAN_DIV[] = { 104 ADM1029_REG_FAN1_CONFIG, 105 ADM1029_REG_FAN2_CONFIG, 106 }; 107 108 /* 109 * Functions declaration 110 */ 111 112 static int adm1029_probe(struct i2c_client *client, 113 const struct i2c_device_id *id); 114 static int adm1029_detect(struct i2c_client *client, 115 struct i2c_board_info *info); 116 static int adm1029_remove(struct i2c_client *client); 117 static struct adm1029_data *adm1029_update_device(struct device *dev); 118 static int adm1029_init_client(struct i2c_client *client); 119 120 /* 121 * Driver data (common to all clients) 122 */ 123 124 static const struct i2c_device_id adm1029_id[] = { 125 { "adm1029", 0 }, 126 { } 127 }; 128 MODULE_DEVICE_TABLE(i2c, adm1029_id); 129 130 static struct i2c_driver adm1029_driver = { 131 .class = I2C_CLASS_HWMON, 132 .driver = { 133 .name = "adm1029", 134 }, 135 .probe = adm1029_probe, 136 .remove = adm1029_remove, 137 .id_table = adm1029_id, 138 .detect = adm1029_detect, 139 .address_list = normal_i2c, 140 }; 141 142 /* 143 * Client data (each client gets its own) 144 */ 145 146 struct adm1029_data { 147 struct device *hwmon_dev; 148 struct mutex update_lock; 149 char valid; /* zero until following fields are valid */ 150 unsigned long last_updated; /* in jiffies */ 151 152 /* registers values, signed for temperature, unsigned for other stuff */ 153 s8 temp[ARRAY_SIZE(ADM1029_REG_TEMP)]; 154 u8 fan[ARRAY_SIZE(ADM1029_REG_FAN)]; 155 u8 fan_div[ARRAY_SIZE(ADM1029_REG_FAN_DIV)]; 156 }; 157 158 /* 159 * Sysfs stuff 160 */ 161 162 static ssize_t 163 show_temp(struct device *dev, struct device_attribute *devattr, char *buf) 164 { 165 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 166 struct adm1029_data *data = adm1029_update_device(dev); 167 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index])); 168 } 169 170 static ssize_t 171 show_fan(struct device *dev, struct device_attribute *devattr, char *buf) 172 { 173 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 174 struct adm1029_data *data = adm1029_update_device(dev); 175 u16 val; 176 if (data->fan[attr->index] == 0 177 || (data->fan_div[attr->index] & 0xC0) == 0 178 || data->fan[attr->index] == 255) { 179 return sprintf(buf, "0\n"); 180 } 181 182 val = 1880 * 120 / DIV_FROM_REG(data->fan_div[attr->index]) 183 / data->fan[attr->index]; 184 return sprintf(buf, "%d\n", val); 185 } 186 187 static ssize_t 188 show_fan_div(struct device *dev, struct device_attribute *devattr, char *buf) 189 { 190 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 191 struct adm1029_data *data = adm1029_update_device(dev); 192 if ((data->fan_div[attr->index] & 0xC0) == 0) 193 return sprintf(buf, "0\n"); 194 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index])); 195 } 196 197 static ssize_t set_fan_div(struct device *dev, 198 struct device_attribute *devattr, const char *buf, size_t count) 199 { 200 struct i2c_client *client = to_i2c_client(dev); 201 struct adm1029_data *data = i2c_get_clientdata(client); 202 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 203 long val = simple_strtol(buf, NULL, 10); 204 u8 reg; 205 206 mutex_lock(&data->update_lock); 207 208 /*Read actual config */ 209 reg = i2c_smbus_read_byte_data(client, 210 ADM1029_REG_FAN_DIV[attr->index]); 211 212 switch (val) { 213 case 1: 214 val = 1; 215 break; 216 case 2: 217 val = 2; 218 break; 219 case 4: 220 val = 3; 221 break; 222 default: 223 mutex_unlock(&data->update_lock); 224 dev_err(&client->dev, "fan_div value %ld not " 225 "supported. Choose one of 1, 2 or 4!\n", val); 226 return -EINVAL; 227 } 228 /* Update the value */ 229 reg = (reg & 0x3F) | (val << 6); 230 231 /* Write value */ 232 i2c_smbus_write_byte_data(client, 233 ADM1029_REG_FAN_DIV[attr->index], reg); 234 mutex_unlock(&data->update_lock); 235 236 return count; 237 } 238 239 /* 240 Access rights on sysfs, S_IRUGO stand for Is Readable by User, Group and Others 241 S_IWUSR stand for Is Writable by User 242 */ 243 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); 244 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); 245 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); 246 247 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 3); 248 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp, NULL, 4); 249 static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp, NULL, 5); 250 251 static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp, NULL, 6); 252 static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp, NULL, 7); 253 static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp, NULL, 8); 254 255 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0); 256 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1); 257 258 static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan, NULL, 2); 259 static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan, NULL, 3); 260 261 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, 262 show_fan_div, set_fan_div, 0); 263 static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR, 264 show_fan_div, set_fan_div, 1); 265 266 static struct attribute *adm1029_attributes[] = { 267 &sensor_dev_attr_temp1_input.dev_attr.attr, 268 &sensor_dev_attr_temp1_min.dev_attr.attr, 269 &sensor_dev_attr_temp1_max.dev_attr.attr, 270 &sensor_dev_attr_temp2_input.dev_attr.attr, 271 &sensor_dev_attr_temp2_min.dev_attr.attr, 272 &sensor_dev_attr_temp2_max.dev_attr.attr, 273 &sensor_dev_attr_temp3_input.dev_attr.attr, 274 &sensor_dev_attr_temp3_min.dev_attr.attr, 275 &sensor_dev_attr_temp3_max.dev_attr.attr, 276 &sensor_dev_attr_fan1_input.dev_attr.attr, 277 &sensor_dev_attr_fan2_input.dev_attr.attr, 278 &sensor_dev_attr_fan1_min.dev_attr.attr, 279 &sensor_dev_attr_fan2_min.dev_attr.attr, 280 &sensor_dev_attr_fan1_div.dev_attr.attr, 281 &sensor_dev_attr_fan2_div.dev_attr.attr, 282 NULL 283 }; 284 285 static const struct attribute_group adm1029_group = { 286 .attrs = adm1029_attributes, 287 }; 288 289 /* 290 * Real code 291 */ 292 293 /* Return 0 if detection is successful, -ENODEV otherwise */ 294 static int adm1029_detect(struct i2c_client *client, 295 struct i2c_board_info *info) 296 { 297 struct i2c_adapter *adapter = client->adapter; 298 u8 man_id, chip_id, temp_devices_installed, nb_fan_support; 299 300 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 301 return -ENODEV; 302 303 /* ADM1029 doesn't have CHIP ID, check just MAN ID 304 * For better detection we check also ADM1029_TEMP_DEVICES_INSTALLED, 305 * ADM1029_REG_NB_FAN_SUPPORT and compare it with possible values 306 * documented 307 */ 308 309 man_id = i2c_smbus_read_byte_data(client, ADM1029_REG_MAN_ID); 310 chip_id = i2c_smbus_read_byte_data(client, ADM1029_REG_CHIP_ID); 311 temp_devices_installed = i2c_smbus_read_byte_data(client, 312 ADM1029_REG_TEMP_DEVICES_INSTALLED); 313 nb_fan_support = i2c_smbus_read_byte_data(client, 314 ADM1029_REG_NB_FAN_SUPPORT); 315 /* 0x41 is Analog Devices */ 316 if (man_id != 0x41 || (temp_devices_installed & 0xf9) != 0x01 317 || nb_fan_support != 0x03) 318 return -ENODEV; 319 320 if ((chip_id & 0xF0) != 0x00) { 321 /* There are no "official" CHIP ID, so actually 322 * we use Major/Minor revision for that */ 323 pr_info("adm1029: Unknown major revision %x, " 324 "please let us know\n", chip_id); 325 return -ENODEV; 326 } 327 328 strlcpy(info->type, "adm1029", I2C_NAME_SIZE); 329 330 return 0; 331 } 332 333 static int adm1029_probe(struct i2c_client *client, 334 const struct i2c_device_id *id) 335 { 336 struct adm1029_data *data; 337 int err; 338 339 data = kzalloc(sizeof(struct adm1029_data), GFP_KERNEL); 340 if (!data) { 341 err = -ENOMEM; 342 goto exit; 343 } 344 345 i2c_set_clientdata(client, data); 346 mutex_init(&data->update_lock); 347 348 /* 349 * Initialize the ADM1029 chip 350 * Check config register 351 */ 352 if (adm1029_init_client(client) == 0) { 353 err = -ENODEV; 354 goto exit_free; 355 } 356 357 /* Register sysfs hooks */ 358 if ((err = sysfs_create_group(&client->dev.kobj, &adm1029_group))) 359 goto exit_free; 360 361 data->hwmon_dev = hwmon_device_register(&client->dev); 362 if (IS_ERR(data->hwmon_dev)) { 363 err = PTR_ERR(data->hwmon_dev); 364 goto exit_remove_files; 365 } 366 367 return 0; 368 369 exit_remove_files: 370 sysfs_remove_group(&client->dev.kobj, &adm1029_group); 371 exit_free: 372 kfree(data); 373 exit: 374 return err; 375 } 376 377 static int adm1029_init_client(struct i2c_client *client) 378 { 379 u8 config; 380 config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG); 381 if ((config & 0x10) == 0) { 382 i2c_smbus_write_byte_data(client, ADM1029_REG_CONFIG, 383 config | 0x10); 384 } 385 /* recheck config */ 386 config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG); 387 if ((config & 0x10) == 0) { 388 dev_err(&client->dev, "Initialization failed!\n"); 389 return 0; 390 } 391 return 1; 392 } 393 394 static int adm1029_remove(struct i2c_client *client) 395 { 396 struct adm1029_data *data = i2c_get_clientdata(client); 397 398 hwmon_device_unregister(data->hwmon_dev); 399 sysfs_remove_group(&client->dev.kobj, &adm1029_group); 400 401 kfree(data); 402 return 0; 403 } 404 405 /* 406 function that update the status of the chips (temperature for example) 407 */ 408 static struct adm1029_data *adm1029_update_device(struct device *dev) 409 { 410 struct i2c_client *client = to_i2c_client(dev); 411 struct adm1029_data *data = i2c_get_clientdata(client); 412 413 mutex_lock(&data->update_lock); 414 /* 415 * Use the "cache" Luke, don't recheck values 416 * if there are already checked not a long time later 417 */ 418 if (time_after(jiffies, data->last_updated + HZ * 2) 419 || !data->valid) { 420 int nr; 421 422 dev_dbg(&client->dev, "Updating adm1029 data\n"); 423 424 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_TEMP); nr++) { 425 data->temp[nr] = 426 i2c_smbus_read_byte_data(client, 427 ADM1029_REG_TEMP[nr]); 428 } 429 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN); nr++) { 430 data->fan[nr] = 431 i2c_smbus_read_byte_data(client, 432 ADM1029_REG_FAN[nr]); 433 } 434 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN_DIV); nr++) { 435 data->fan_div[nr] = 436 i2c_smbus_read_byte_data(client, 437 ADM1029_REG_FAN_DIV[nr]); 438 } 439 440 data->last_updated = jiffies; 441 data->valid = 1; 442 } 443 444 mutex_unlock(&data->update_lock); 445 446 return data; 447 } 448 449 /* 450 Common module stuff 451 */ 452 static int __init sensors_adm1029_init(void) 453 { 454 455 return i2c_add_driver(&adm1029_driver); 456 } 457 458 static void __exit sensors_adm1029_exit(void) 459 { 460 461 i2c_del_driver(&adm1029_driver); 462 } 463 464 MODULE_AUTHOR("Corentin LABBE <corentin.labbe@geomatys.fr>"); 465 MODULE_DESCRIPTION("adm1029 driver"); 466 MODULE_LICENSE("GPL v2"); 467 468 module_init(sensors_adm1029_init); 469 module_exit(sensors_adm1029_exit); 470