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 i2c_client client;
  82         struct device *hwmon_dev;
  83         enum chips type;
  84
  85         struct mutex update_lock;
  86         char valid;             /* !=0 if following fields are valid */
  87         unsigned long last_updated;     /* In jiffies */
  88
  89         s8 temp_max[2];         /* Register values */
  90         s8 temp_min[2];
  91         s8 temp[2];
  92         u8 alarms;
  93         /* Special values for ADM1023 only */
  94         u8 remote_temp_prec;
  95         u8 remote_temp_os_prec;
  96         u8 remote_temp_hyst_prec;
  97         u8 remote_temp_offset;
  98         u8 remote_temp_offset_prec;
  99 };
 100
 101 static int adm1021_attach_adapter(struct i2c_adapter *adapter);
 102 static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind);
 103 static void adm1021_init_client(struct i2c_client *client);
 104 static int adm1021_detach_client(struct i2c_client *client);
 105 static struct adm1021_data *adm1021_update_device(struct device *dev);
 106
 107 /* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
 108 static int read_only;
 109
 110
 111 /* This is the driver that will be inserted */
 112 static struct i2c_driver adm1021_driver = {
 113         .driver = {
 114                 .name   = "adm1021",
 115         },
 116         .attach_adapter = adm1021_attach_adapter,
 117         .detach_client  = adm1021_detach_client,
 118 };
 119
 120 static ssize_t show_temp(struct device *dev,
 121                          struct device_attribute *devattr, char *buf)
 122 {
 123         int index = to_sensor_dev_attr(devattr)->index;
 124         struct adm1021_data *data = adm1021_update_device(dev);
 125
 126         return sprintf(buf, "%d\n", 1000 * data->temp[index]);
 127 }
 128
 129 static ssize_t show_temp_max(struct device *dev,
 130                              struct device_attribute *devattr, char *buf)
 131 {
 132         int index = to_sensor_dev_attr(devattr)->index;
 133         struct adm1021_data *data = adm1021_update_device(dev);
 134
 135         return sprintf(buf, "%d\n", 1000 * data->temp_max[index]);
 136 }
 137
 138 static ssize_t show_temp_min(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_min[index]);
 145 }
 146
 147 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 148                           char *buf)
 149 {
 150         int index = to_sensor_dev_attr(attr)->index;
 151         struct adm1021_data *data = adm1021_update_device(dev);
 152         return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
 153 }
 154
 155 static ssize_t show_alarms(struct device *dev,
 156                            struct device_attribute *attr,
 157                            char *buf)
 158 {
 159         struct adm1021_data *data = adm1021_update_device(dev);
 160         return sprintf(buf, "%u\n", data->alarms);
 161 }
 162
 163 static ssize_t set_temp_max(struct device *dev,
 164                             struct device_attribute *devattr,
 165                             const char *buf, size_t count)
 166 {
 167         int index = to_sensor_dev_attr(devattr)->index;
 168         struct i2c_client *client = to_i2c_client(dev);
 169         struct adm1021_data *data = i2c_get_clientdata(client);
 170         long temp = simple_strtol(buf, NULL, 10) / 1000;
 171
 172         mutex_lock(&data->update_lock);
 173         data->temp_max[index] = SENSORS_LIMIT(temp, -128, 127);
 174         if (!read_only)
 175                 i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
 176                                           data->temp_max[index]);
 177         mutex_unlock(&data->update_lock);
 178
 179         return count;
 180 }
 181
 182 static ssize_t set_temp_min(struct device *dev,
 183                             struct device_attribute *devattr,
 184                             const char *buf, size_t count)
 185 {
 186         int index = to_sensor_dev_attr(devattr)->index;
 187         struct i2c_client *client = to_i2c_client(dev);
 188         struct adm1021_data *data = i2c_get_clientdata(client);
 189         long temp = simple_strtol(buf, NULL, 10) / 1000;
 190
 191         mutex_lock(&data->update_lock);
 192         data->temp_min[index] = SENSORS_LIMIT(temp, -128, 127);
 193         if (!read_only)
 194                 i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
 195                                           data->temp_min[index]);
 196         mutex_unlock(&data->update_lock);
 197
 198         return count;
 199 }
 200
 201 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
 202 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
 203                           set_temp_max, 0);
 204 static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min,
 205                           set_temp_min, 0);
 206 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
 207 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
 208                           set_temp_max, 1);
 209 static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min,
 210                           set_temp_min, 1);
 211 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
 212 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
 213 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
 214 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
 215 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
 216
 217 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 218
 219 static int adm1021_attach_adapter(struct i2c_adapter *adapter)
 220 {
 221         if (!(adapter->class & I2C_CLASS_HWMON))
 222                 return 0;
 223         return i2c_probe(adapter, &addr_data, adm1021_detect);
 224 }
 225
 226 static struct attribute *adm1021_attributes[] = {
 227         &sensor_dev_attr_temp1_max.dev_attr.attr,
 228         &sensor_dev_attr_temp1_min.dev_attr.attr,
 229         &sensor_dev_attr_temp1_input.dev_attr.attr,
 230         &sensor_dev_attr_temp2_max.dev_attr.attr,
 231         &sensor_dev_attr_temp2_min.dev_attr.attr,
 232         &sensor_dev_attr_temp2_input.dev_attr.attr,
 233         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 234         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 235         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 236         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 237         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 238         &dev_attr_alarms.attr,
 239         NULL
 240 };
 241
 242 static const struct attribute_group adm1021_group = {
 243         .attrs = adm1021_attributes,
 244 };
 245
 246 static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind)
 247 {
 248         int i;
 249         struct i2c_client *client;
 250         struct adm1021_data *data;
 251         int err = 0;
 252         const char *type_name = "";
 253         int conv_rate, status, config;
 254
 255         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 256                 pr_debug("adm1021: detect failed, "
 257                          "smbus byte data not supported!\n");
 258                 goto error0;
 259         }
 260
 261         /* OK. For now, we presume we have a valid client. We now create the
 262            client structure, even though we cannot fill it completely yet.
 263            But it allows us to access adm1021 register values. */
 264
 265         if (!(data = kzalloc(sizeof(struct adm1021_data), GFP_KERNEL))) {
 266                 pr_debug("adm1021: detect failed, kzalloc failed!\n");
 267                 err = -ENOMEM;
 268                 goto error0;
 269         }
 270
 271         client = &data->client;
 272         i2c_set_clientdata(client, data);
 273         client->addr = address;
 274         client->adapter = adapter;
 275         client->driver = &adm1021_driver;
 276         status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
 277         conv_rate = i2c_smbus_read_byte_data(client,
 278                                              ADM1021_REG_CONV_RATE_R);
 279         config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R);
 280
 281         /* Now, we do the remaining detection. */
 282         if (kind < 0) {
 283                 if ((status & 0x03) != 0x00 || (config & 0x3F) != 0x00
 284                     || (conv_rate & 0xF8) != 0x00) {
 285                         pr_debug("adm1021: detect failed, "
 286                                  "chip not detected!\n");
 287                         err = -ENODEV;
 288                         goto error1;
 289                 }
 290         }
 291
 292         /* Determine the chip type. */
 293         if (kind <= 0) {
 294                 i = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
 295                 if (i == 0x41)
 296                         if ((i2c_smbus_read_byte_data(client,
 297                                         ADM1021_REG_DEV_ID) & 0xF0) == 0x30)
 298                                 kind = adm1023;
 299                         else
 300                                 kind = adm1021;
 301                 else if (i == 0x49)
 302                         kind = thmc10;
 303                 else if (i == 0x23)
 304                         kind = gl523sm;
 305                 else if ((i == 0x4d) &&
 306                          (i2c_smbus_read_byte_data(client,
 307                                                    ADM1021_REG_DEV_ID) == 0x01))
 308                         kind = max1617a;
 309                 else if (i == 0x54)
 310                         kind = mc1066;
 311                 /* LM84 Mfr ID in a different place, and it has more unused bits */
 312                 else if (conv_rate == 0x00
 313                          && (kind == 0 /* skip extra detection */
 314                              || ((config & 0x7F) == 0x00
 315                                  && (status & 0xAB) == 0x00)))
 316                         kind = lm84;
 317                 else
 318                         kind = max1617;
 319         }
 320
 321         if (kind == max1617) {
 322                 type_name = "max1617";
 323         } else if (kind == max1617a) {
 324                 type_name = "max1617a";
 325         } else if (kind == adm1021) {
 326                 type_name = "adm1021";
 327         } else if (kind == adm1023) {
 328                 type_name = "adm1023";
 329         } else if (kind == thmc10) {
 330                 type_name = "thmc10";
 331         } else if (kind == lm84) {
 332                 type_name = "lm84";
 333         } else if (kind == gl523sm) {
 334                 type_name = "gl523sm";
 335         } else if (kind == mc1066) {
 336                 type_name = "mc1066";
 337         }
 338         pr_debug("adm1021: Detected chip %s at adapter %d, address 0x%02x.\n",
 339                  type_name, i2c_adapter_id(adapter), address);
 340
 341         /* Fill in the remaining client fields */
 342         strlcpy(client->name, type_name, I2C_NAME_SIZE);
 343         data->type = kind;
 344         mutex_init(&data->update_lock);
 345
 346         /* Tell the I2C layer a new client has arrived */
 347         if ((err = i2c_attach_client(client)))
 348                 goto error1;
 349
 350         /* Initialize the ADM1021 chip */
 351         if (kind != lm84 && !read_only)
 352                 adm1021_init_client(client);
 353
 354         /* Register sysfs hooks */
 355         if ((err = sysfs_create_group(&client->dev.kobj, &adm1021_group)))
 356                 goto error2;
 357
 358         data->hwmon_dev = hwmon_device_register(&client->dev);
 359         if (IS_ERR(data->hwmon_dev)) {
 360                 err = PTR_ERR(data->hwmon_dev);
 361                 goto error3;
 362         }
 363
 364         return 0;
 365
 366 error3:
 367         sysfs_remove_group(&client->dev.kobj, &adm1021_group);
 368 error2:
 369         i2c_detach_client(client);
 370 error1:
 371         kfree(data);
 372 error0:
 373         return err;
 374 }
 375
 376 static void adm1021_init_client(struct i2c_client *client)
 377 {
 378         /* Enable ADC and disable suspend mode */
 379         i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
 380                 i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF);
 381         /* Set Conversion rate to 1/sec (this can be tinkered with) */
 382         i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
 383 }
 384
 385 static int adm1021_detach_client(struct i2c_client *client)
 386 {
 387         struct adm1021_data *data = i2c_get_clientdata(client);
 388         int err;
 389
 390         hwmon_device_unregister(data->hwmon_dev);
 391         sysfs_remove_group(&client->dev.kobj, &adm1021_group);
 392
 393         if ((err = i2c_detach_client(client)))
 394                 return err;
 395
 396         kfree(data);
 397         return 0;
 398 }
 399
 400 static struct adm1021_data *adm1021_update_device(struct device *dev)
 401 {
 402         struct i2c_client *client = to_i2c_client(dev);
 403         struct adm1021_data *data = i2c_get_clientdata(client);
 404
 405         mutex_lock(&data->update_lock);
 406
 407         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 408             || !data->valid) {
 409                 int i;
 410
 411                 dev_dbg(&client->dev, "Starting adm1021 update\n");
 412
 413                 for (i = 0; i < 2; i++) {
 414                         data->temp[i] = i2c_smbus_read_byte_data(client,
 415                                                 ADM1021_REG_TEMP(i));
 416                         data->temp_max[i] = i2c_smbus_read_byte_data(client,
 417                                                 ADM1021_REG_TOS_R(i));
 418                         data->temp_min[i] = i2c_smbus_read_byte_data(client,
 419                                                 ADM1021_REG_THYST_R(i));
 420                 }
 421                 data->alarms = i2c_smbus_read_byte_data(client,
 422                                                 ADM1021_REG_STATUS) & 0x7c;
 423                 if (data->type == adm1023) {
 424                         data->remote_temp_prec =
 425                                 i2c_smbus_read_byte_data(client,
 426                                                 ADM1023_REG_REM_TEMP_PREC);
 427                         data->remote_temp_os_prec =
 428                                 i2c_smbus_read_byte_data(client,
 429                                                 ADM1023_REG_REM_TOS_PREC);
 430                         data->remote_temp_hyst_prec =
 431                                 i2c_smbus_read_byte_data(client,
 432                                                 ADM1023_REG_REM_THYST_PREC);
 433                         data->remote_temp_offset =
 434                                 i2c_smbus_read_byte_data(client,
 435                                                 ADM1023_REG_REM_OFFSET);
 436                         data->remote_temp_offset_prec =
 437                                 i2c_smbus_read_byte_data(client,
 438                                                 ADM1023_REG_REM_OFFSET_PREC);
 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 static int __init sensors_adm1021_init(void)
 450 {
 451         return i2c_add_driver(&adm1021_driver);
 452 }
 453
 454 static void __exit sensors_adm1021_exit(void)
 455 {
 456         i2c_del_driver(&adm1021_driver);
 457 }
 458
 459 MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl> and "
 460                 "Philip Edelbrock <phil@netroedge.com>");
 461 MODULE_DESCRIPTION("adm1021 driver");
 462 MODULE_LICENSE("GPL");
 463
 464 module_param(read_only, bool, 0);
 465 MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
 466
 467 module_init(sensors_adm1021_init)
 468 module_exit(sensors_adm1021_exit)