drivers/hwmon/adm1021.c

   1 /*
   2     adm1021.c - Part of lm_sensors, Linux kernel modules for hardware
   3                 monitoring
   4     Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl> and
   5     Philip Edelbrock <phil@netroedge.com>
   6
   7     This program is free software; you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation; either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     This program is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with this program; if not, write to the Free Software
  19     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include <linux/module.h>
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/jiffies.h>
  26 #include <linux/i2c.h>
  27 #include <linux/hwmon.h>
  28 #include <linux/hwmon-sysfs.h>
  29 #include <linux/err.h>
  30 #include <linux/mutex.h>
  31
  32
  33 /* Addresses to scan */
  34 static const unsigned short normal_i2c[] = {
  35         0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
  36
  37 /* Insmod parameters */
  38 I2C_CLIENT_INSMOD_8(adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm,
  39                         mc1066);
  40
  41 /* adm1021 constants specified below */
  42
  43 /* The adm1021 registers */
  44 /* Read-only */
  45 /* For nr in 0-1 */
  46 #define ADM1021_REG_TEMP(nr)            (nr)
  47 #define ADM1021_REG_STATUS              0x02
  48 /* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */
  49 #define ADM1021_REG_MAN_ID              0xFE
  50 /* ADM1021 = 0x0X, ADM1023 = 0x3X */
  51 #define ADM1021_REG_DEV_ID              0xFF
  52 /* These use different addresses for reading/writing */
  53 #define ADM1021_REG_CONFIG_R            0x03
  54 #define ADM1021_REG_CONFIG_W            0x09
  55 #define ADM1021_REG_CONV_RATE_R         0x04
  56 #define ADM1021_REG_CONV_RATE_W         0x0A
  57 /* These are for the ADM1023's additional precision on the remote temp sensor */
  58 #define ADM1023_REG_REM_TEMP_PREC       0x10
  59 #define ADM1023_REG_REM_OFFSET          0x11
  60 #define ADM1023_REG_REM_OFFSET_PREC     0x12
  61 #define ADM1023_REG_REM_TOS_PREC        0x13
  62 #define ADM1023_REG_REM_THYST_PREC      0x14
  63 /* limits */
  64 /* For nr in 0-1 */
  65 #define ADM1021_REG_TOS_R(nr)           (0x05 + 2 * (nr))
  66 #define ADM1021_REG_TOS_W(nr)           (0x0B + 2 * (nr))
  67 #define ADM1021_REG_THYST_R(nr)         (0x06 + 2 * (nr))
  68 #define ADM1021_REG_THYST_W(nr)         (0x0C + 2 * (nr))
  69 /* write-only */
  70 #define ADM1021_REG_ONESHOT             0x0F
  71
  72 /* Initial values */
  73
  74 /* Note: Even though I left the low and high limits named os and hyst,
  75 they don't quite work like a thermostat the way the LM75 does.  I.e.,
  76 a lower temp than THYST actually triggers an alarm instead of
  77 clearing it.  Weird, ey?   --Phil  */
  78
  79 /* Each client has this additional data */
  80 struct adm1021_data {
  81         struct device *hwmon_dev;
  82         enum chips type;
  83
  84         struct mutex update_lock;
  85         char valid;             /* !=0 if following fields are valid */
  86         unsigned long last_updated;     /* In jiffies */
  87
  88         s8 temp_max[2];         /* Register values */
  89         s8 temp_min[2];
  90         s8 temp[2];
  91         u8 alarms;
  92         /* Special values for ADM1023 only */
  93         u8 remote_temp_prec;
  94         u8 remote_temp_os_prec;
  95         u8 remote_temp_hyst_prec;
  96         u8 remote_temp_offset;
  97         u8 remote_temp_offset_prec;
  98 };
  99
 100 static int adm1021_probe(struct i2c_client *client,
 101                          const struct i2c_device_id *id);
 102 static int adm1021_detect(struct i2c_client *client, int kind,
 103                           struct i2c_board_info *info);
 104 static void adm1021_init_client(struct i2c_client *client);
 105 static int adm1021_remove(struct i2c_client *client);
 106 static struct adm1021_data *adm1021_update_device(struct device *dev);
 107
 108 /* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
 109 static int read_only;
 110
 111
 112 static const struct i2c_device_id adm1021_id[] = {
 113         { "adm1021", adm1021 },
 114         { "adm1023", adm1023 },
 115         { "max1617", max1617 },
 116         { "max1617a", max1617a },
 117         { "thmc10", thmc10 },
 118         { "lm84", lm84 },
 119         { "gl523sm", gl523sm },
 120         { "mc1066", mc1066 },
 121         { }
 122 };
 123 MODULE_DEVICE_TABLE(i2c, adm1021_id);
 124
 125 /* This is the driver that will be inserted */
 126 static struct i2c_driver adm1021_driver = {
 127         .class          = I2C_CLASS_HWMON,
 128         .driver = {
 129                 .name   = "adm1021",
 130         },
 131         .probe          = adm1021_probe,
 132         .remove         = adm1021_remove,
 133         .id_table       = adm1021_id,
 134         .detect         = adm1021_detect,
 135         .address_data   = &addr_data,
 136 };
 137
 138 static ssize_t show_temp(struct device *dev,
 139                          struct device_attribute *devattr, char *buf)
 140 {
 141         int index = to_sensor_dev_attr(devattr)->index;
 142         struct adm1021_data *data = adm1021_update_device(dev);
 143
 144         return sprintf(buf, "%d\n", 1000 * data->temp[index]);
 145 }
 146
 147 static ssize_t show_temp_max(struct device *dev,
 148                              struct device_attribute *devattr, char *buf)
 149 {
 150         int index = to_sensor_dev_attr(devattr)->index;
 151         struct adm1021_data *data = adm1021_update_device(dev);
 152
 153         return sprintf(buf, "%d\n", 1000 * data->temp_max[index]);
 154 }
 155
 156 static ssize_t show_temp_min(struct device *dev,
 157                              struct device_attribute *devattr, char *buf)
 158 {
 159         int index = to_sensor_dev_attr(devattr)->index;
 160         struct adm1021_data *data = adm1021_update_device(dev);
 161
 162         return sprintf(buf, "%d\n", 1000 * data->temp_min[index]);
 163 }
 164
 165 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 166                           char *buf)
 167 {
 168         int index = to_sensor_dev_attr(attr)->index;
 169         struct adm1021_data *data = adm1021_update_device(dev);
 170         return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
 171 }
 172
 173 static ssize_t show_alarms(struct device *dev,
 174                            struct device_attribute *attr,
 175                            char *buf)
 176 {
 177         struct adm1021_data *data = adm1021_update_device(dev);
 178         return sprintf(buf, "%u\n", data->alarms);
 179 }
 180
 181 static ssize_t set_temp_max(struct device *dev,
 182                             struct device_attribute *devattr,
 183                             const char *buf, size_t count)
 184 {
 185         int index = to_sensor_dev_attr(devattr)->index;
 186         struct i2c_client *client = to_i2c_client(dev);
 187         struct adm1021_data *data = i2c_get_clientdata(client);
 188         long temp = simple_strtol(buf, NULL, 10) / 1000;
 189
 190         mutex_lock(&data->update_lock);
 191         data->temp_max[index] = SENSORS_LIMIT(temp, -128, 127);
 192         if (!read_only)
 193                 i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
 194                                           data->temp_max[index]);
 195         mutex_unlock(&data->update_lock);
 196
 197         return count;
 198 }
 199
 200 static ssize_t set_temp_min(struct device *dev,
 201                             struct device_attribute *devattr,
 202                             const char *buf, size_t count)
 203 {
 204         int index = to_sensor_dev_attr(devattr)->index;
 205         struct i2c_client *client = to_i2c_client(dev);
 206         struct adm1021_data *data = i2c_get_clientdata(client);
 207         long temp = simple_strtol(buf, NULL, 10) / 1000;
 208
 209         mutex_lock(&data->update_lock);
 210         data->temp_min[index] = SENSORS_LIMIT(temp, -128, 127);
 211         if (!read_only)
 212                 i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
 213                                           data->temp_min[index]);
 214         mutex_unlock(&data->update_lock);
 215
 216         return count;
 217 }
 218
 219 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
 220 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
 221                           set_temp_max, 0);
 222 static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min,
 223                           set_temp_min, 0);
 224 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
 225 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
 226                           set_temp_max, 1);
 227 static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min,
 228                           set_temp_min, 1);
 229 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
 230 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
 231 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
 232 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
 233 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
 234
 235 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 236
 237 static struct attribute *adm1021_attributes[] = {
 238         &sensor_dev_attr_temp1_max.dev_attr.attr,
 239         &sensor_dev_attr_temp1_min.dev_attr.attr,
 240         &sensor_dev_attr_temp1_input.dev_attr.attr,
 241         &sensor_dev_attr_temp2_max.dev_attr.attr,
 242         &sensor_dev_attr_temp2_min.dev_attr.attr,
 243         &sensor_dev_attr_temp2_input.dev_attr.attr,
 244         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 245         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 246         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 247         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 248         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 249         &dev_attr_alarms.attr,
 250         NULL
 251 };
 252
 253 static const struct attribute_group adm1021_group = {
 254         .attrs = adm1021_attributes,
 255 };
 256
 257 /* Return 0 if detection is successful, -ENODEV otherwise */
 258 static int adm1021_detect(struct i2c_client *client, int kind,
 259                           struct i2c_board_info *info)
 260 {
 261         struct i2c_adapter *adapter = client->adapter;
 262         int i;
 263         const char *type_name = "";
 264         int conv_rate, status, config;
 265
 266         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 267                 pr_debug("adm1021: detect failed, "
 268                          "smbus byte data not supported!\n");
 269                 return -ENODEV;
 270         }
 271
 272         status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
 273         conv_rate = i2c_smbus_read_byte_data(client,
 274                                              ADM1021_REG_CONV_RATE_R);
 275         config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R);
 276
 277         /* Now, we do the remaining detection. */
 278         if (kind < 0) {
 279                 if ((status & 0x03) != 0x00 || (config & 0x3F) != 0x00
 280                     || (conv_rate & 0xF8) != 0x00) {
 281                         pr_debug("adm1021: detect failed, "
 282                                  "chip not detected!\n");
 283                         return -ENODEV;
 284                 }
 285         }
 286
 287         /* Determine the chip type. */
 288         if (kind <= 0) {
 289                 i = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
 290                 if (i == 0x41)
 291                         if ((i2c_smbus_read_byte_data(client,
 292                                         ADM1021_REG_DEV_ID) & 0xF0) == 0x30)
 293                                 kind = adm1023;
 294                         else
 295                                 kind = adm1021;
 296                 else if (i == 0x49)
 297                         kind = thmc10;
 298                 else if (i == 0x23)
 299                         kind = gl523sm;
 300                 else if ((i == 0x4d) &&
 301                          (i2c_smbus_read_byte_data(client,
 302                                                    ADM1021_REG_DEV_ID) == 0x01))
 303                         kind = max1617a;
 304                 else if (i == 0x54)
 305                         kind = mc1066;
 306                 /* LM84 Mfr ID in a different place, and it has more unused bits */
 307                 else if (conv_rate == 0x00
 308                          && (kind == 0 /* skip extra detection */
 309                              || ((config & 0x7F) == 0x00
 310                                  && (status & 0xAB) == 0x00)))
 311                         kind = lm84;
 312                 else
 313                         kind = max1617;
 314         }
 315
 316         if (kind == max1617) {
 317                 type_name = "max1617";
 318         } else if (kind == max1617a) {
 319                 type_name = "max1617a";
 320         } else if (kind == adm1021) {
 321                 type_name = "adm1021";
 322         } else if (kind == adm1023) {
 323                 type_name = "adm1023";
 324         } else if (kind == thmc10) {
 325                 type_name = "thmc10";
 326         } else if (kind == lm84) {
 327                 type_name = "lm84";
 328         } else if (kind == gl523sm) {
 329                 type_name = "gl523sm";
 330         } else if (kind == mc1066) {
 331                 type_name = "mc1066";
 332         }
 333         pr_debug("adm1021: Detected chip %s at adapter %d, address 0x%02x.\n",
 334                  type_name, i2c_adapter_id(adapter), client->addr);
 335         strlcpy(info->type, type_name, I2C_NAME_SIZE);
 336
 337         return 0;
 338 }
 339
 340 static int adm1021_probe(struct i2c_client *client,
 341                          const struct i2c_device_id *id)
 342 {
 343         struct adm1021_data *data;
 344         int err;
 345
 346         data = kzalloc(sizeof(struct adm1021_data), GFP_KERNEL);
 347         if (!data) {
 348                 pr_debug("adm1021: detect failed, kzalloc failed!\n");
 349                 err = -ENOMEM;
 350                 goto error0;
 351         }
 352
 353         i2c_set_clientdata(client, data);
 354         data->type = id->driver_data;
 355         mutex_init(&data->update_lock);
 356
 357         /* Initialize the ADM1021 chip */
 358         if (data->type != lm84 && !read_only)
 359                 adm1021_init_client(client);
 360
 361         /* Register sysfs hooks */
 362         if ((err = sysfs_create_group(&client->dev.kobj, &adm1021_group)))
 363                 goto error1;
 364
 365         data->hwmon_dev = hwmon_device_register(&client->dev);
 366         if (IS_ERR(data->hwmon_dev)) {
 367                 err = PTR_ERR(data->hwmon_dev);
 368                 goto error3;
 369         }
 370
 371         return 0;
 372
 373 error3:
 374         sysfs_remove_group(&client->dev.kobj, &adm1021_group);
 375 error1:
 376         kfree(data);
 377 error0:
 378         return err;
 379 }
 380
 381 static void adm1021_init_client(struct i2c_client *client)
 382 {
 383         /* Enable ADC and disable suspend mode */
 384         i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
 385                 i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF);
 386         /* Set Conversion rate to 1/sec (this can be tinkered with) */
 387         i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
 388 }
 389
 390 static int adm1021_remove(struct i2c_client *client)
 391 {
 392         struct adm1021_data *data = i2c_get_clientdata(client);
 393
 394         hwmon_device_unregister(data->hwmon_dev);
 395         sysfs_remove_group(&client->dev.kobj, &adm1021_group);
 396
 397         kfree(data);
 398         return 0;
 399 }
 400
 401 static struct adm1021_data *adm1021_update_device(struct device *dev)
 402 {
 403         struct i2c_client *client = to_i2c_client(dev);
 404         struct adm1021_data *data = i2c_get_clientdata(client);
 405
 406         mutex_lock(&data->update_lock);
 407
 408         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 409             || !data->valid) {
 410                 int i;
 411
 412                 dev_dbg(&client->dev, "Starting adm1021 update\n");
 413
 414                 for (i = 0; i < 2; i++) {
 415                         data->temp[i] = i2c_smbus_read_byte_data(client,
 416                                                 ADM1021_REG_TEMP(i));
 417                         data->temp_max[i] = i2c_smbus_read_byte_data(client,
 418                                                 ADM1021_REG_TOS_R(i));
 419                         data->temp_min[i] = i2c_smbus_read_byte_data(client,
 420                                                 ADM1021_REG_THYST_R(i));
 421                 }
 422                 data->alarms = i2c_smbus_read_byte_data(client,
 423                                                 ADM1021_REG_STATUS) & 0x7c;
 424                 if (data->type == adm1023) {
 425                         data->remote_temp_prec =
 426                                 i2c_smbus_read_byte_data(client,
 427                                                 ADM1023_REG_REM_TEMP_PREC);
 428                         data->remote_temp_os_prec =
 429                                 i2c_smbus_read_byte_data(client,
 430                                                 ADM1023_REG_REM_TOS_PREC);
 431                         data->remote_temp_hyst_prec =
 432                                 i2c_smbus_read_byte_data(client,
 433                                                 ADM1023_REG_REM_THYST_PREC);
 434                         data->remote_temp_offset =
 435                                 i2c_smbus_read_byte_data(client,
 436                                                 ADM1023_REG_REM_OFFSET);
 437                         data->remote_temp_offset_prec =
 438                                 i2c_smbus_read_byte_data(client,
 439                                                 ADM1023_REG_REM_OFFSET_PREC);
 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 static int __init sensors_adm1021_init(void)
 451 {
 452         return i2c_add_driver(&adm1021_driver);
 453 }
 454
 455 static void __exit sensors_adm1021_exit(void)
 456 {
 457         i2c_del_driver(&adm1021_driver);
 458 }
 459
 460 MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl> and "
 461                 "Philip Edelbrock <phil@netroedge.com>");
 462 MODULE_DESCRIPTION("adm1021 driver");
 463 MODULE_LICENSE("GPL");
 464
 465 module_param(read_only, bool, 0);
 466 MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
 467
 468 module_init(sensors_adm1021_init)
 469 module_exit(sensors_adm1021_exit)