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 u8 reg; 204 long val; 205 int ret = kstrtol(buf, 10, &val); 206 if (ret < 0) 207 return ret; 208 209 mutex_lock(&data->update_lock); 210 211 /*Read actual config */ 212 reg = i2c_smbus_read_byte_data(client, 213 ADM1029_REG_FAN_DIV[attr->index]); 214 215 switch (val) { 216 case 1: 217 val = 1; 218 break; 219 case 2: 220 val = 2; 221 break; 222 case 4: 223 val = 3; 224 break; 225 default: 226 mutex_unlock(&data->update_lock); 227 dev_err(&client->dev, 228 "fan_div value %ld not supported. Choose one of 1, 2 or 4!\n", 229 val); 230 return -EINVAL; 231 } 232 /* Update the value */ 233 reg = (reg & 0x3F) | (val << 6); 234 235 /* Write value */ 236 i2c_smbus_write_byte_data(client, 237 ADM1029_REG_FAN_DIV[attr->index], reg); 238 mutex_unlock(&data->update_lock); 239 240 return count; 241 } 242 243 /* 244 * Access rights on sysfs. S_IRUGO: Is Readable by User, Group and Others 245 * S_IWUSR: Is Writable by User. 246 */ 247 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); 248 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); 249 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); 250 251 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 3); 252 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp, NULL, 4); 253 static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp, NULL, 5); 254 255 static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp, NULL, 6); 256 static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp, NULL, 7); 257 static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp, NULL, 8); 258 259 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0); 260 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1); 261 262 static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan, NULL, 2); 263 static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan, NULL, 3); 264 265 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, 266 show_fan_div, set_fan_div, 0); 267 static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR, 268 show_fan_div, set_fan_div, 1); 269 270 static struct attribute *adm1029_attributes[] = { 271 &sensor_dev_attr_temp1_input.dev_attr.attr, 272 &sensor_dev_attr_temp1_min.dev_attr.attr, 273 &sensor_dev_attr_temp1_max.dev_attr.attr, 274 &sensor_dev_attr_temp2_input.dev_attr.attr, 275 &sensor_dev_attr_temp2_min.dev_attr.attr, 276 &sensor_dev_attr_temp2_max.dev_attr.attr, 277 &sensor_dev_attr_temp3_input.dev_attr.attr, 278 &sensor_dev_attr_temp3_min.dev_attr.attr, 279 &sensor_dev_attr_temp3_max.dev_attr.attr, 280 &sensor_dev_attr_fan1_input.dev_attr.attr, 281 &sensor_dev_attr_fan2_input.dev_attr.attr, 282 &sensor_dev_attr_fan1_min.dev_attr.attr, 283 &sensor_dev_attr_fan2_min.dev_attr.attr, 284 &sensor_dev_attr_fan1_div.dev_attr.attr, 285 &sensor_dev_attr_fan2_div.dev_attr.attr, 286 NULL 287 }; 288 289 static const struct attribute_group adm1029_group = { 290 .attrs = adm1029_attributes, 291 }; 292 293 /* 294 * Real code 295 */ 296 297 /* Return 0 if detection is successful, -ENODEV otherwise */ 298 static int adm1029_detect(struct i2c_client *client, 299 struct i2c_board_info *info) 300 { 301 struct i2c_adapter *adapter = client->adapter; 302 u8 man_id, chip_id, temp_devices_installed, nb_fan_support; 303 304 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 305 return -ENODEV; 306 307 /* 308 * ADM1029 doesn't have CHIP ID, check just MAN ID 309 * For better detection we check also ADM1029_TEMP_DEVICES_INSTALLED, 310 * ADM1029_REG_NB_FAN_SUPPORT and compare it with possible values 311 * documented 312 */ 313 314 man_id = i2c_smbus_read_byte_data(client, ADM1029_REG_MAN_ID); 315 chip_id = i2c_smbus_read_byte_data(client, ADM1029_REG_CHIP_ID); 316 temp_devices_installed = i2c_smbus_read_byte_data(client, 317 ADM1029_REG_TEMP_DEVICES_INSTALLED); 318 nb_fan_support = i2c_smbus_read_byte_data(client, 319 ADM1029_REG_NB_FAN_SUPPORT); 320 /* 0x41 is Analog Devices */ 321 if (man_id != 0x41 || (temp_devices_installed & 0xf9) != 0x01 322 || nb_fan_support != 0x03) 323 return -ENODEV; 324 325 if ((chip_id & 0xF0) != 0x00) { 326 /* 327 * There are no "official" CHIP ID, so actually 328 * we use Major/Minor revision for that 329 */ 330 pr_info("Unknown major revision %x, please let us know\n", 331 chip_id); 332 return -ENODEV; 333 } 334 335 strlcpy(info->type, "adm1029", I2C_NAME_SIZE); 336 337 return 0; 338 } 339 340 static int adm1029_probe(struct i2c_client *client, 341 const struct i2c_device_id *id) 342 { 343 struct adm1029_data *data; 344 int err; 345 346 data = devm_kzalloc(&client->dev, sizeof(struct adm1029_data), 347 GFP_KERNEL); 348 if (!data) 349 return -ENOMEM; 350 351 i2c_set_clientdata(client, data); 352 mutex_init(&data->update_lock); 353 354 /* 355 * Initialize the ADM1029 chip 356 * Check config register 357 */ 358 if (adm1029_init_client(client) == 0) 359 return -ENODEV; 360 361 /* Register sysfs hooks */ 362 err = sysfs_create_group(&client->dev.kobj, &adm1029_group); 363 if (err) 364 return err; 365 366 data->hwmon_dev = hwmon_device_register(&client->dev); 367 if (IS_ERR(data->hwmon_dev)) { 368 err = PTR_ERR(data->hwmon_dev); 369 goto exit_remove_files; 370 } 371 372 return 0; 373 374 exit_remove_files: 375 sysfs_remove_group(&client->dev.kobj, &adm1029_group); 376 return err; 377 } 378 379 static int adm1029_init_client(struct i2c_client *client) 380 { 381 u8 config; 382 config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG); 383 if ((config & 0x10) == 0) { 384 i2c_smbus_write_byte_data(client, ADM1029_REG_CONFIG, 385 config | 0x10); 386 } 387 /* recheck config */ 388 config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG); 389 if ((config & 0x10) == 0) { 390 dev_err(&client->dev, "Initialization failed!\n"); 391 return 0; 392 } 393 return 1; 394 } 395 396 static int adm1029_remove(struct i2c_client *client) 397 { 398 struct adm1029_data *data = i2c_get_clientdata(client); 399 400 hwmon_device_unregister(data->hwmon_dev); 401 sysfs_remove_group(&client->dev.kobj, &adm1029_group); 402 403 return 0; 404 } 405 406 /* 407 * function that update the status of the chips (temperature for example) 408 */ 409 static struct adm1029_data *adm1029_update_device(struct device *dev) 410 { 411 struct i2c_client *client = to_i2c_client(dev); 412 struct adm1029_data *data = i2c_get_clientdata(client); 413 414 mutex_lock(&data->update_lock); 415 /* 416 * Use the "cache" Luke, don't recheck values 417 * if there are already checked not a long time later 418 */ 419 if (time_after(jiffies, data->last_updated + HZ * 2) 420 || !data->valid) { 421 int nr; 422 423 dev_dbg(&client->dev, "Updating adm1029 data\n"); 424 425 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_TEMP); nr++) { 426 data->temp[nr] = 427 i2c_smbus_read_byte_data(client, 428 ADM1029_REG_TEMP[nr]); 429 } 430 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN); nr++) { 431 data->fan[nr] = 432 i2c_smbus_read_byte_data(client, 433 ADM1029_REG_FAN[nr]); 434 } 435 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN_DIV); nr++) { 436 data->fan_div[nr] = 437 i2c_smbus_read_byte_data(client, 438 ADM1029_REG_FAN_DIV[nr]); 439 } 440 441 data->last_updated = jiffies; 442 data->valid = 1; 443 } 444 445 mutex_unlock(&data->update_lock); 446 447 return data; 448 } 449 450 module_i2c_driver(adm1029_driver); 451 452 MODULE_AUTHOR("Corentin LABBE <corentin.labbe@geomatys.fr>"); 453 MODULE_DESCRIPTION("adm1029 driver"); 454 MODULE_LICENSE("GPL v2"); 455