drivers/hwmon/adm1029.c

   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, "fan_div value %ld not "
 228                         "supported. Choose one of 1, 2 or 4!\n", val);
 229                 return -EINVAL;
 230         }
 231         /* Update the value */
 232         reg = (reg & 0x3F) | (val << 6);
 233
 234         /* Write value */
 235         i2c_smbus_write_byte_data(client,
 236                                   ADM1029_REG_FAN_DIV[attr->index], reg);
 237         mutex_unlock(&data->update_lock);
 238
 239         return count;
 240 }
 241
 242 /*
 243  * Access rights on sysfs. S_IRUGO: Is Readable by User, Group and Others
 244  *                         S_IWUSR: Is Writable by User.
 245  */
 246 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
 247 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
 248 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
 249
 250 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 3);
 251 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp, NULL, 4);
 252 static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp, NULL, 5);
 253
 254 static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp, NULL, 6);
 255 static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp, NULL, 7);
 256 static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp, NULL, 8);
 257
 258 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
 259 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
 260
 261 static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan, NULL, 2);
 262 static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan, NULL, 3);
 263
 264 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
 265                           show_fan_div, set_fan_div, 0);
 266 static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
 267                           show_fan_div, set_fan_div, 1);
 268
 269 static struct attribute *adm1029_attributes[] = {
 270         &sensor_dev_attr_temp1_input.dev_attr.attr,
 271         &sensor_dev_attr_temp1_min.dev_attr.attr,
 272         &sensor_dev_attr_temp1_max.dev_attr.attr,
 273         &sensor_dev_attr_temp2_input.dev_attr.attr,
 274         &sensor_dev_attr_temp2_min.dev_attr.attr,
 275         &sensor_dev_attr_temp2_max.dev_attr.attr,
 276         &sensor_dev_attr_temp3_input.dev_attr.attr,
 277         &sensor_dev_attr_temp3_min.dev_attr.attr,
 278         &sensor_dev_attr_temp3_max.dev_attr.attr,
 279         &sensor_dev_attr_fan1_input.dev_attr.attr,
 280         &sensor_dev_attr_fan2_input.dev_attr.attr,
 281         &sensor_dev_attr_fan1_min.dev_attr.attr,
 282         &sensor_dev_attr_fan2_min.dev_attr.attr,
 283         &sensor_dev_attr_fan1_div.dev_attr.attr,
 284         &sensor_dev_attr_fan2_div.dev_attr.attr,
 285         NULL
 286 };
 287
 288 static const struct attribute_group adm1029_group = {
 289         .attrs = adm1029_attributes,
 290 };
 291
 292 /*
 293  * Real code
 294  */
 295
 296 /* Return 0 if detection is successful, -ENODEV otherwise */
 297 static int adm1029_detect(struct i2c_client *client,
 298                           struct i2c_board_info *info)
 299 {
 300         struct i2c_adapter *adapter = client->adapter;
 301         u8 man_id, chip_id, temp_devices_installed, nb_fan_support;
 302
 303         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 304                 return -ENODEV;
 305
 306         /*
 307          * ADM1029 doesn't have CHIP ID, check just MAN ID
 308          * For better detection we check also ADM1029_TEMP_DEVICES_INSTALLED,
 309          * ADM1029_REG_NB_FAN_SUPPORT and compare it with possible values
 310          * documented
 311          */
 312
 313         man_id = i2c_smbus_read_byte_data(client, ADM1029_REG_MAN_ID);
 314         chip_id = i2c_smbus_read_byte_data(client, ADM1029_REG_CHIP_ID);
 315         temp_devices_installed = i2c_smbus_read_byte_data(client,
 316                                         ADM1029_REG_TEMP_DEVICES_INSTALLED);
 317         nb_fan_support = i2c_smbus_read_byte_data(client,
 318                                                 ADM1029_REG_NB_FAN_SUPPORT);
 319         /* 0x41 is Analog Devices */
 320         if (man_id != 0x41 || (temp_devices_installed & 0xf9) != 0x01
 321             || nb_fan_support != 0x03)
 322                 return -ENODEV;
 323
 324         if ((chip_id & 0xF0) != 0x00) {
 325                 /*
 326                  * There are no "official" CHIP ID, so actually
 327                  * we use Major/Minor revision for that
 328                  */
 329                 pr_info("adm1029: Unknown major revision %x, "
 330                         "please let us know\n", chip_id);
 331                 return -ENODEV;
 332         }
 333
 334         strlcpy(info->type, "adm1029", I2C_NAME_SIZE);
 335
 336         return 0;
 337 }
 338
 339 static int adm1029_probe(struct i2c_client *client,
 340                          const struct i2c_device_id *id)
 341 {
 342         struct adm1029_data *data;
 343         int err;
 344
 345         data = kzalloc(sizeof(struct adm1029_data), GFP_KERNEL);
 346         if (!data) {
 347                 err = -ENOMEM;
 348                 goto exit;
 349         }
 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                 err = -ENODEV;
 360                 goto exit_free;
 361         }
 362
 363         /* Register sysfs hooks */
 364         err = sysfs_create_group(&client->dev.kobj, &adm1029_group);
 365         if (err)
 366                 goto exit_free;
 367
 368         data->hwmon_dev = hwmon_device_register(&client->dev);
 369         if (IS_ERR(data->hwmon_dev)) {
 370                 err = PTR_ERR(data->hwmon_dev);
 371                 goto exit_remove_files;
 372         }
 373
 374         return 0;
 375
 376  exit_remove_files:
 377         sysfs_remove_group(&client->dev.kobj, &adm1029_group);
 378  exit_free:
 379         kfree(data);
 380  exit:
 381         return err;
 382 }
 383
 384 static int adm1029_init_client(struct i2c_client *client)
 385 {
 386         u8 config;
 387         config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
 388         if ((config & 0x10) == 0) {
 389                 i2c_smbus_write_byte_data(client, ADM1029_REG_CONFIG,
 390                                           config | 0x10);
 391         }
 392         /* recheck config */
 393         config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
 394         if ((config & 0x10) == 0) {
 395                 dev_err(&client->dev, "Initialization failed!\n");
 396                 return 0;
 397         }
 398         return 1;
 399 }
 400
 401 static int adm1029_remove(struct i2c_client *client)
 402 {
 403         struct adm1029_data *data = i2c_get_clientdata(client);
 404
 405         hwmon_device_unregister(data->hwmon_dev);
 406         sysfs_remove_group(&client->dev.kobj, &adm1029_group);
 407
 408         kfree(data);
 409         return 0;
 410 }
 411
 412 /*
 413  * function that update the status of the chips (temperature for example)
 414  */
 415 static struct adm1029_data *adm1029_update_device(struct device *dev)
 416 {
 417         struct i2c_client *client = to_i2c_client(dev);
 418         struct adm1029_data *data = i2c_get_clientdata(client);
 419
 420         mutex_lock(&data->update_lock);
 421         /*
 422          * Use the "cache" Luke, don't recheck values
 423          * if there are already checked not a long time later
 424          */
 425         if (time_after(jiffies, data->last_updated + HZ * 2)
 426          || !data->valid) {
 427                 int nr;
 428
 429                 dev_dbg(&client->dev, "Updating adm1029 data\n");
 430
 431                 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_TEMP); nr++) {
 432                         data->temp[nr] =
 433                             i2c_smbus_read_byte_data(client,
 434                                                      ADM1029_REG_TEMP[nr]);
 435                 }
 436                 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN); nr++) {
 437                         data->fan[nr] =
 438                             i2c_smbus_read_byte_data(client,
 439                                                      ADM1029_REG_FAN[nr]);
 440                 }
 441                 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN_DIV); nr++) {
 442                         data->fan_div[nr] =
 443                             i2c_smbus_read_byte_data(client,
 444                                                      ADM1029_REG_FAN_DIV[nr]);
 445                 }
 446
 447                 data->last_updated = jiffies;
 448                 data->valid = 1;
 449         }
 450
 451         mutex_unlock(&data->update_lock);
 452
 453         return data;
 454 }
 455
 456 module_i2c_driver(adm1029_driver);
 457
 458 MODULE_AUTHOR("Corentin LABBE <corentin.labbe@geomatys.fr>");
 459 MODULE_DESCRIPTION("adm1029 driver");
 460 MODULE_LICENSE("GPL v2");