1 /* 2 * lm83.c - Part of lm_sensors, Linux kernel modules for hardware 3 * monitoring 4 * Copyright (C) 2003-2009 Jean Delvare <khali@linux-fr.org> 5 * 6 * Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is 7 * a sensor chip made by National Semiconductor. It reports up to four 8 * temperatures (its own plus up to three external ones) with a 1 deg 9 * resolution and a 3-4 deg accuracy. Complete datasheet can be obtained 10 * from National's website at: 11 * http://www.national.com/pf/LM/LM83.html 12 * Since the datasheet omits to give the chip stepping code, I give it 13 * here: 0x03 (at register 0xff). 14 * 15 * Also supports the LM82 temp sensor, which is basically a stripped down 16 * model of the LM83. Datasheet is here: 17 * http://www.national.com/pf/LM/LM82.html 18 * 19 * This program is free software; you can redistribute it and/or modify 20 * it under the terms of the GNU General Public License as published by 21 * the Free Software Foundation; either version 2 of the License, or 22 * (at your option) any later version. 23 * 24 * This program is distributed in the hope that it will be useful, 25 * but WITHOUT ANY WARRANTY; without even the implied warranty of 26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 27 * GNU General Public License for more details. 28 * 29 * You should have received a copy of the GNU General Public License 30 * along with this program; if not, write to the Free Software 31 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 32 */ 33 34 #include <linux/module.h> 35 #include <linux/init.h> 36 #include <linux/slab.h> 37 #include <linux/jiffies.h> 38 #include <linux/i2c.h> 39 #include <linux/hwmon-sysfs.h> 40 #include <linux/hwmon.h> 41 #include <linux/err.h> 42 #include <linux/mutex.h> 43 #include <linux/sysfs.h> 44 45 /* 46 * Addresses to scan 47 * Address is selected using 2 three-level pins, resulting in 9 possible 48 * addresses. 49 */ 50 51 static const unsigned short normal_i2c[] = { 52 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; 53 54 enum chips { lm83, lm82 }; 55 56 /* 57 * The LM83 registers 58 * Manufacturer ID is 0x01 for National Semiconductor. 59 */ 60 61 #define LM83_REG_R_MAN_ID 0xFE 62 #define LM83_REG_R_CHIP_ID 0xFF 63 #define LM83_REG_R_CONFIG 0x03 64 #define LM83_REG_W_CONFIG 0x09 65 #define LM83_REG_R_STATUS1 0x02 66 #define LM83_REG_R_STATUS2 0x35 67 #define LM83_REG_R_LOCAL_TEMP 0x00 68 #define LM83_REG_R_LOCAL_HIGH 0x05 69 #define LM83_REG_W_LOCAL_HIGH 0x0B 70 #define LM83_REG_R_REMOTE1_TEMP 0x30 71 #define LM83_REG_R_REMOTE1_HIGH 0x38 72 #define LM83_REG_W_REMOTE1_HIGH 0x50 73 #define LM83_REG_R_REMOTE2_TEMP 0x01 74 #define LM83_REG_R_REMOTE2_HIGH 0x07 75 #define LM83_REG_W_REMOTE2_HIGH 0x0D 76 #define LM83_REG_R_REMOTE3_TEMP 0x31 77 #define LM83_REG_R_REMOTE3_HIGH 0x3A 78 #define LM83_REG_W_REMOTE3_HIGH 0x52 79 #define LM83_REG_R_TCRIT 0x42 80 #define LM83_REG_W_TCRIT 0x5A 81 82 /* 83 * Conversions and various macros 84 * The LM83 uses signed 8-bit values with LSB = 1 degree Celsius. 85 */ 86 87 #define TEMP_FROM_REG(val) ((val) * 1000) 88 #define TEMP_TO_REG(val) ((val) <= -128000 ? -128 : \ 89 (val) >= 127000 ? 127 : \ 90 (val) < 0 ? ((val) - 500) / 1000 : \ 91 ((val) + 500) / 1000) 92 93 static const u8 LM83_REG_R_TEMP[] = { 94 LM83_REG_R_LOCAL_TEMP, 95 LM83_REG_R_REMOTE1_TEMP, 96 LM83_REG_R_REMOTE2_TEMP, 97 LM83_REG_R_REMOTE3_TEMP, 98 LM83_REG_R_LOCAL_HIGH, 99 LM83_REG_R_REMOTE1_HIGH, 100 LM83_REG_R_REMOTE2_HIGH, 101 LM83_REG_R_REMOTE3_HIGH, 102 LM83_REG_R_TCRIT, 103 }; 104 105 static const u8 LM83_REG_W_HIGH[] = { 106 LM83_REG_W_LOCAL_HIGH, 107 LM83_REG_W_REMOTE1_HIGH, 108 LM83_REG_W_REMOTE2_HIGH, 109 LM83_REG_W_REMOTE3_HIGH, 110 LM83_REG_W_TCRIT, 111 }; 112 113 /* 114 * Functions declaration 115 */ 116 117 static int lm83_detect(struct i2c_client *new_client, 118 struct i2c_board_info *info); 119 static int lm83_probe(struct i2c_client *client, 120 const struct i2c_device_id *id); 121 static int lm83_remove(struct i2c_client *client); 122 static struct lm83_data *lm83_update_device(struct device *dev); 123 124 /* 125 * Driver data (common to all clients) 126 */ 127 128 static const struct i2c_device_id lm83_id[] = { 129 { "lm83", lm83 }, 130 { "lm82", lm82 }, 131 { } 132 }; 133 MODULE_DEVICE_TABLE(i2c, lm83_id); 134 135 static struct i2c_driver lm83_driver = { 136 .class = I2C_CLASS_HWMON, 137 .driver = { 138 .name = "lm83", 139 }, 140 .probe = lm83_probe, 141 .remove = lm83_remove, 142 .id_table = lm83_id, 143 .detect = lm83_detect, 144 .address_list = normal_i2c, 145 }; 146 147 /* 148 * Client data (each client gets its own) 149 */ 150 151 struct lm83_data { 152 struct device *hwmon_dev; 153 struct mutex update_lock; 154 char valid; /* zero until following fields are valid */ 155 unsigned long last_updated; /* in jiffies */ 156 157 /* registers values */ 158 s8 temp[9]; /* 0..3: input 1-4, 159 4..7: high limit 1-4, 160 8 : critical limit */ 161 u16 alarms; /* bitvector, combined */ 162 }; 163 164 /* 165 * Sysfs stuff 166 */ 167 168 static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, 169 char *buf) 170 { 171 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 172 struct lm83_data *data = lm83_update_device(dev); 173 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index])); 174 } 175 176 static ssize_t set_temp(struct device *dev, struct device_attribute *devattr, 177 const char *buf, size_t count) 178 { 179 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 180 struct i2c_client *client = to_i2c_client(dev); 181 struct lm83_data *data = i2c_get_clientdata(client); 182 long val = simple_strtol(buf, NULL, 10); 183 int nr = attr->index; 184 185 mutex_lock(&data->update_lock); 186 data->temp[nr] = TEMP_TO_REG(val); 187 i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4], 188 data->temp[nr]); 189 mutex_unlock(&data->update_lock); 190 return count; 191 } 192 193 static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy, 194 char *buf) 195 { 196 struct lm83_data *data = lm83_update_device(dev); 197 return sprintf(buf, "%d\n", data->alarms); 198 } 199 200 static ssize_t show_alarm(struct device *dev, struct device_attribute 201 *devattr, char *buf) 202 { 203 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 204 struct lm83_data *data = lm83_update_device(dev); 205 int bitnr = attr->index; 206 207 return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1); 208 } 209 210 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); 211 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); 212 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); 213 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3); 214 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp, 215 set_temp, 4); 216 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp, 217 set_temp, 5); 218 static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_temp, 219 set_temp, 6); 220 static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_temp, 221 set_temp, 7); 222 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, 8); 223 static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp, NULL, 8); 224 static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp, 225 set_temp, 8); 226 static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp, NULL, 8); 227 228 /* Individual alarm files */ 229 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0); 230 static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 1); 231 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2); 232 static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4); 233 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6); 234 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8); 235 static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 9); 236 static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 10); 237 static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 12); 238 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 13); 239 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 15); 240 /* Raw alarm file for compatibility */ 241 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 242 243 static struct attribute *lm83_attributes[] = { 244 &sensor_dev_attr_temp1_input.dev_attr.attr, 245 &sensor_dev_attr_temp3_input.dev_attr.attr, 246 &sensor_dev_attr_temp1_max.dev_attr.attr, 247 &sensor_dev_attr_temp3_max.dev_attr.attr, 248 &sensor_dev_attr_temp1_crit.dev_attr.attr, 249 &sensor_dev_attr_temp3_crit.dev_attr.attr, 250 251 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, 252 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr, 253 &sensor_dev_attr_temp3_fault.dev_attr.attr, 254 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr, 255 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, 256 &dev_attr_alarms.attr, 257 NULL 258 }; 259 260 static const struct attribute_group lm83_group = { 261 .attrs = lm83_attributes, 262 }; 263 264 static struct attribute *lm83_attributes_opt[] = { 265 &sensor_dev_attr_temp2_input.dev_attr.attr, 266 &sensor_dev_attr_temp4_input.dev_attr.attr, 267 &sensor_dev_attr_temp2_max.dev_attr.attr, 268 &sensor_dev_attr_temp4_max.dev_attr.attr, 269 &sensor_dev_attr_temp2_crit.dev_attr.attr, 270 &sensor_dev_attr_temp4_crit.dev_attr.attr, 271 272 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, 273 &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr, 274 &sensor_dev_attr_temp4_fault.dev_attr.attr, 275 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr, 276 &sensor_dev_attr_temp2_fault.dev_attr.attr, 277 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, 278 NULL 279 }; 280 281 static const struct attribute_group lm83_group_opt = { 282 .attrs = lm83_attributes_opt, 283 }; 284 285 /* 286 * Real code 287 */ 288 289 /* Return 0 if detection is successful, -ENODEV otherwise */ 290 static int lm83_detect(struct i2c_client *new_client, 291 struct i2c_board_info *info) 292 { 293 struct i2c_adapter *adapter = new_client->adapter; 294 const char *name; 295 u8 man_id, chip_id; 296 297 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 298 return -ENODEV; 299 300 /* Detection */ 301 if ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1) & 0xA8) || 302 (i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2) & 0x48) || 303 (i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG) & 0x41)) { 304 dev_dbg(&adapter->dev, "LM83 detection failed at 0x%02x\n", 305 new_client->addr); 306 return -ENODEV; 307 } 308 309 /* Identification */ 310 man_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_MAN_ID); 311 if (man_id != 0x01) /* National Semiconductor */ 312 return -ENODEV; 313 314 chip_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_CHIP_ID); 315 switch (chip_id) { 316 case 0x03: 317 name = "lm83"; 318 break; 319 case 0x01: 320 name = "lm82"; 321 break; 322 default: 323 /* identification failed */ 324 dev_info(&adapter->dev, 325 "Unsupported chip (man_id=0x%02X, chip_id=0x%02X)\n", 326 man_id, chip_id); 327 return -ENODEV; 328 } 329 330 strlcpy(info->type, name, I2C_NAME_SIZE); 331 332 return 0; 333 } 334 335 static int lm83_probe(struct i2c_client *new_client, 336 const struct i2c_device_id *id) 337 { 338 struct lm83_data *data; 339 int err; 340 341 data = kzalloc(sizeof(struct lm83_data), GFP_KERNEL); 342 if (!data) { 343 err = -ENOMEM; 344 goto exit; 345 } 346 347 i2c_set_clientdata(new_client, data); 348 data->valid = 0; 349 mutex_init(&data->update_lock); 350 351 /* 352 * Register sysfs hooks 353 * The LM82 can only monitor one external diode which is 354 * at the same register as the LM83 temp3 entry - so we 355 * declare 1 and 3 common, and then 2 and 4 only for the LM83. 356 */ 357 358 if ((err = sysfs_create_group(&new_client->dev.kobj, &lm83_group))) 359 goto exit_free; 360 361 if (id->driver_data == lm83) { 362 if ((err = sysfs_create_group(&new_client->dev.kobj, 363 &lm83_group_opt))) 364 goto exit_remove_files; 365 } 366 367 data->hwmon_dev = hwmon_device_register(&new_client->dev); 368 if (IS_ERR(data->hwmon_dev)) { 369 err = PTR_ERR(data->hwmon_dev); 370 goto exit_remove_files; 371 } 372 373 return 0; 374 375 exit_remove_files: 376 sysfs_remove_group(&new_client->dev.kobj, &lm83_group); 377 sysfs_remove_group(&new_client->dev.kobj, &lm83_group_opt); 378 exit_free: 379 kfree(data); 380 exit: 381 return err; 382 } 383 384 static int lm83_remove(struct i2c_client *client) 385 { 386 struct lm83_data *data = i2c_get_clientdata(client); 387 388 hwmon_device_unregister(data->hwmon_dev); 389 sysfs_remove_group(&client->dev.kobj, &lm83_group); 390 sysfs_remove_group(&client->dev.kobj, &lm83_group_opt); 391 392 kfree(data); 393 return 0; 394 } 395 396 static struct lm83_data *lm83_update_device(struct device *dev) 397 { 398 struct i2c_client *client = to_i2c_client(dev); 399 struct lm83_data *data = i2c_get_clientdata(client); 400 401 mutex_lock(&data->update_lock); 402 403 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { 404 int nr; 405 406 dev_dbg(&client->dev, "Updating lm83 data.\n"); 407 for (nr = 0; nr < 9; nr++) { 408 data->temp[nr] = 409 i2c_smbus_read_byte_data(client, 410 LM83_REG_R_TEMP[nr]); 411 } 412 data->alarms = 413 i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1) 414 + (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2) 415 << 8); 416 417 data->last_updated = jiffies; 418 data->valid = 1; 419 } 420 421 mutex_unlock(&data->update_lock); 422 423 return data; 424 } 425 426 static int __init sensors_lm83_init(void) 427 { 428 return i2c_add_driver(&lm83_driver); 429 } 430 431 static void __exit sensors_lm83_exit(void) 432 { 433 i2c_del_driver(&lm83_driver); 434 } 435 436 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); 437 MODULE_DESCRIPTION("LM83 driver"); 438 MODULE_LICENSE("GPL"); 439 440 module_init(sensors_lm83_init); 441 module_exit(sensors_lm83_exit); 442