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 unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
  35                                         0x29, 0x2a, 0x2b,
  36                                         0x4c, 0x4d, 0x4e,
  37                                         I2C_CLIENT_END };
  38
  39 /* Insmod parameters */
  40 I2C_CLIENT_INSMOD_8(adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm,
  41                         mc1066);
  42
  43 /* adm1021 constants specified below */
  44
  45 /* The adm1021 registers */
  46 /* Read-only */
  47 /* For nr in 0-1 */
  48 #define ADM1021_REG_TEMP(nr)            (nr)
  49 #define ADM1021_REG_STATUS              0x02
  50 /* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */
  51 #define ADM1021_REG_MAN_ID              0xFE
  52 /* ADM1021 = 0x0X, ADM1023 = 0x3X */
  53 #define ADM1021_REG_DEV_ID              0xFF
  54 /* These use different addresses for reading/writing */
  55 #define ADM1021_REG_CONFIG_R            0x03
  56 #define ADM1021_REG_CONFIG_W            0x09
  57 #define ADM1021_REG_CONV_RATE_R         0x04
  58 #define ADM1021_REG_CONV_RATE_W         0x0A
  59 /* These are for the ADM1023's additional precision on the remote temp sensor */
  60 #define ADM1023_REG_REM_TEMP_PREC       0x10
  61 #define ADM1023_REG_REM_OFFSET          0x11
  62 #define ADM1023_REG_REM_OFFSET_PREC     0x12
  63 #define ADM1023_REG_REM_TOS_PREC        0x13
  64 #define ADM1023_REG_REM_THYST_PREC      0x14
  65 /* limits */
  66 /* For nr in 0-1 */
  67 #define ADM1021_REG_TOS_R(nr)           (0x05 + 2 * (nr))
  68 #define ADM1021_REG_TOS_W(nr)           (0x0B + 2 * (nr))
  69 #define ADM1021_REG_THYST_R(nr)         (0x06 + 2 * (nr))
  70 #define ADM1021_REG_THYST_W(nr)         (0x0C + 2 * (nr))
  71 /* write-only */
  72 #define ADM1021_REG_ONESHOT             0x0F
  73
  74 /* Initial values */
  75
  76 /* Note: Even though I left the low and high limits named os and hyst,
  77 they don't quite work like a thermostat the way the LM75 does.  I.e.,
  78 a lower temp than THYST actually triggers an alarm instead of
  79 clearing it.  Weird, ey?   --Phil  */
  80
  81 /* Each client has this additional data */
  82 struct adm1021_data {
  83         struct i2c_client client;
  84         struct device *hwmon_dev;
  85         enum chips type;
  86
  87         struct mutex update_lock;
  88         char valid;             /* !=0 if following fields are valid */
  89         unsigned long last_updated;     /* In jiffies */
  90
  91         s8 temp_max[2];         /* Register values */
  92         s8 temp_min[2];
  93         s8 temp[2];
  94         u8 alarms;
  95         /* Special values for ADM1023 only */
  96         u8 remote_temp_prec;
  97         u8 remote_temp_os_prec;
  98         u8 remote_temp_hyst_prec;
  99         u8 remote_temp_offset;
 100         u8 remote_temp_offset_prec;
 101 };
 102
 103 static int adm1021_attach_adapter(struct i2c_adapter *adapter);
 104 static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind);
 105 static void adm1021_init_client(struct i2c_client *client);
 106 static int adm1021_detach_client(struct i2c_client *client);
 107 static struct adm1021_data *adm1021_update_device(struct device *dev);
 108
 109 /* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
 110 static int read_only;
 111
 112
 113 /* This is the driver that will be inserted */
 114 static struct i2c_driver adm1021_driver = {
 115         .driver = {
 116                 .name   = "adm1021",
 117         },
 118         .id             = I2C_DRIVERID_ADM1021,
 119         .attach_adapter = adm1021_attach_adapter,
 120         .detach_client  = adm1021_detach_client,
 121 };
 122
 123 static ssize_t show_temp(struct device *dev,
 124                          struct device_attribute *devattr, char *buf)
 125 {
 126         int index = to_sensor_dev_attr(devattr)->index;
 127         struct adm1021_data *data = adm1021_update_device(dev);
 128
 129         return sprintf(buf, "%d\n", 1000 * data->temp[index]);
 130 }
 131
 132 static ssize_t show_temp_max(struct device *dev,
 133                              struct device_attribute *devattr, char *buf)
 134 {
 135         int index = to_sensor_dev_attr(devattr)->index;
 136         struct adm1021_data *data = adm1021_update_device(dev);
 137
 138         return sprintf(buf, "%d\n", 1000 * data->temp_max[index]);
 139 }
 140
 141 static ssize_t show_temp_min(struct device *dev,
 142                              struct device_attribute *devattr, char *buf)
 143 {
 144         int index = to_sensor_dev_attr(devattr)->index;
 145         struct adm1021_data *data = adm1021_update_device(dev);
 146
 147         return sprintf(buf, "%d\n", 1000 * data->temp_min[index]);
 148 }
 149
 150 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 151                           char *buf)
 152 {
 153         int index = to_sensor_dev_attr(attr)->index;
 154         struct adm1021_data *data = adm1021_update_device(dev);
 155         return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
 156 }
 157
 158 static ssize_t show_alarms(struct device *dev,
 159                            struct device_attribute *attr,
 160                            char *buf)
 161 {
 162         struct adm1021_data *data = adm1021_update_device(dev);
 163         return sprintf(buf, "%u\n", data->alarms);
 164 }
 165
 166 static ssize_t set_temp_max(struct device *dev,
 167                             struct device_attribute *devattr,
 168                             const char *buf, size_t count)
 169 {
 170         int index = to_sensor_dev_attr(devattr)->index;
 171         struct i2c_client *client = to_i2c_client(dev);
 172         struct adm1021_data *data = i2c_get_clientdata(client);
 173         long temp = simple_strtol(buf, NULL, 10) / 1000;
 174
 175         mutex_lock(&data->update_lock);
 176         data->temp_max[index] = SENSORS_LIMIT(temp, -128, 127);
 177         if (!read_only)
 178                 i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
 179                                           data->temp_max[index]);
 180         mutex_unlock(&data->update_lock);
 181
 182         return count;
 183 }
 184
 185 static ssize_t set_temp_min(struct device *dev,
 186                             struct device_attribute *devattr,
 187                             const char *buf, size_t count)
 188 {
 189         int index = to_sensor_dev_attr(devattr)->index;
 190         struct i2c_client *client = to_i2c_client(dev);
 191         struct adm1021_data *data = i2c_get_clientdata(client);
 192         long temp = simple_strtol(buf, NULL, 10) / 1000;
 193
 194         mutex_lock(&data->update_lock);
 195         data->temp_min[index] = SENSORS_LIMIT(temp, -128, 127);
 196         if (!read_only)
 197                 i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
 198                                           data->temp_min[index]);
 199         mutex_unlock(&data->update_lock);
 200
 201         return count;
 202 }
 203
 204 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
 205 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
 206                           set_temp_max, 0);
 207 static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min,
 208                           set_temp_min, 0);
 209 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
 210 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
 211                           set_temp_max, 1);
 212 static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min,
 213                           set_temp_min, 1);
 214 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
 215 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
 216 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
 217 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
 218 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
 219
 220 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 221
 222 static int adm1021_attach_adapter(struct i2c_adapter *adapter)
 223 {
 224         if (!(adapter->class & I2C_CLASS_HWMON))
 225                 return 0;
 226         return i2c_probe(adapter, &addr_data, adm1021_detect);
 227 }
 228
 229 static struct attribute *adm1021_attributes[] = {
 230         &sensor_dev_attr_temp1_max.dev_attr.attr,
 231         &sensor_dev_attr_temp1_min.dev_attr.attr,
 232         &sensor_dev_attr_temp1_input.dev_attr.attr,
 233         &sensor_dev_attr_temp2_max.dev_attr.attr,
 234         &sensor_dev_attr_temp2_min.dev_attr.attr,
 235         &sensor_dev_attr_temp2_input.dev_attr.attr,
 236         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 237         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 238         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 239         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 240         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 241         &dev_attr_alarms.attr,
 242         NULL
 243 };
 244
 245 static const struct attribute_group adm1021_group = {
 246         .attrs = adm1021_attributes,
 247 };
 248
 249 static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind)
 250 {
 251         int i;
 252         struct i2c_client *client;
 253         struct adm1021_data *data;
 254         int err = 0;
 255         const char *type_name = "";
 256         int conv_rate, status, config;
 257
 258         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 259                 pr_debug("adm1021: detect failed, "
 260                          "smbus byte data not supported!\n");
 261                 goto error0;
 262         }
 263
 264         /* OK. For now, we presume we have a valid client. We now create the
 265            client structure, even though we cannot fill it completely yet.
 266            But it allows us to access adm1021 register values. */
 267
 268         if (!(data = kzalloc(sizeof(struct adm1021_data), GFP_KERNEL))) {
 269                 pr_debug("adm1021: detect failed, kzalloc failed!\n");
 270                 err = -ENOMEM;
 271                 goto error0;
 272         }
 273
 274         client = &data->client;
 275         i2c_set_clientdata(client, data);
 276         client->addr = address;
 277         client->adapter = adapter;
 278         client->driver = &adm1021_driver;
 279         status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
 280         conv_rate = i2c_smbus_read_byte_data(client,
 281                                              ADM1021_REG_CONV_RATE_R);
 282         config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R);
 283
 284         /* Now, we do the remaining detection. */
 285         if (kind < 0) {
 286                 if ((status & 0x03) != 0x00 || (config & 0x3F) != 0x00
 287                     || (conv_rate & 0xF8) != 0x00) {
 288                         pr_debug("adm1021: detect failed, "
 289                                  "chip not detected!\n");
 290                         err = -ENODEV;
 291                         goto error1;
 292                 }
 293         }
 294
 295         /* Determine the chip type. */
 296         if (kind <= 0) {
 297                 i = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
 298                 if (i == 0x41)
 299                         if ((i2c_smbus_read_byte_data(client,
 300                                         ADM1021_REG_DEV_ID) & 0xF0) == 0x30)
 301                                 kind = adm1023;
 302                         else
 303                                 kind = adm1021;
 304                 else if (i == 0x49)
 305                         kind = thmc10;
 306                 else if (i == 0x23)
 307                         kind = gl523sm;
 308                 else if ((i == 0x4d) &&
 309                          (i2c_smbus_read_byte_data(client,
 310                                                    ADM1021_REG_DEV_ID) == 0x01))
 311                         kind = max1617a;
 312                 else if (i == 0x54)
 313                         kind = mc1066;
 314                 /* LM84 Mfr ID in a different place, and it has more unused bits */
 315                 else if (conv_rate == 0x00
 316                          && (kind == 0 /* skip extra detection */
 317                              || ((config & 0x7F) == 0x00
 318                                  && (status & 0xAB) == 0x00)))
 319                         kind = lm84;
 320                 else
 321                         kind = max1617;
 322         }
 323
 324         if (kind == max1617) {
 325                 type_name = "max1617";
 326         } else if (kind == max1617a) {
 327                 type_name = "max1617a";
 328         } else if (kind == adm1021) {
 329                 type_name = "adm1021";
 330         } else if (kind == adm1023) {
 331                 type_name = "adm1023";
 332         } else if (kind == thmc10) {
 333                 type_name = "thmc10";
 334         } else if (kind == lm84) {
 335                 type_name = "lm84";
 336         } else if (kind == gl523sm) {
 337                 type_name = "gl523sm";
 338         } else if (kind == mc1066) {
 339                 type_name = "mc1066";
 340         }
 341         pr_debug("adm1021: Detected chip %s at adapter %d, address 0x%02x.\n",
 342                  type_name, i2c_adapter_id(adapter), address);
 343
 344         /* Fill in the remaining client fields */
 345         strlcpy(client->name, type_name, I2C_NAME_SIZE);
 346         data->type = kind;
 347         mutex_init(&data->update_lock);
 348
 349         /* Tell the I2C layer a new client has arrived */
 350         if ((err = i2c_attach_client(client)))
 351                 goto error1;
 352
 353         /* Initialize the ADM1021 chip */
 354         if (kind != lm84 && !read_only)
 355                 adm1021_init_client(client);
 356
 357         /* Register sysfs hooks */
 358         if ((err = sysfs_create_group(&client->dev.kobj, &adm1021_group)))
 359                 goto error2;
 360
 361         data->hwmon_dev = hwmon_device_register(&client->dev);
 362         if (IS_ERR(data->hwmon_dev)) {
 363                 err = PTR_ERR(data->hwmon_dev);
 364                 goto error3;
 365         }
 366
 367         return 0;
 368
 369 error3:
 370         sysfs_remove_group(&client->dev.kobj, &adm1021_group);
 371 error2:
 372         i2c_detach_client(client);
 373 error1:
 374         kfree(data);
 375 error0:
 376         return err;
 377 }
 378
 379 static void adm1021_init_client(struct i2c_client *client)
 380 {
 381         /* Enable ADC and disable suspend mode */
 382         i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
 383                 i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF);
 384         /* Set Conversion rate to 1/sec (this can be tinkered with) */
 385         i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
 386 }
 387
 388 static int adm1021_detach_client(struct i2c_client *client)
 389 {
 390         struct adm1021_data *data = i2c_get_clientdata(client);
 391         int err;
 392
 393         hwmon_device_unregister(data->hwmon_dev);
 394         sysfs_remove_group(&client->dev.kobj, &adm1021_group);
 395
 396         if ((err = i2c_detach_client(client)))
 397                 return err;
 398
 399         kfree(data);
 400         return 0;
 401 }
 402
 403 static struct adm1021_data *adm1021_update_device(struct device *dev)
 404 {
 405         struct i2c_client *client = to_i2c_client(dev);
 406         struct adm1021_data *data = i2c_get_clientdata(client);
 407
 408         mutex_lock(&data->update_lock);
 409
 410         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 411             || !data->valid) {
 412                 int i;
 413
 414                 dev_dbg(&client->dev, "Starting adm1021 update\n");
 415
 416                 for (i = 0; i < 2; i++) {
 417                         data->temp[i] = i2c_smbus_read_byte_data(client,
 418                                                 ADM1021_REG_TEMP(i));
 419                         data->temp_max[i] = i2c_smbus_read_byte_data(client,
 420                                                 ADM1021_REG_TOS_R(i));
 421                         data->temp_min[i] = i2c_smbus_read_byte_data(client,
 422                                                 ADM1021_REG_THYST_R(i));
 423                 }
 424                 data->alarms = i2c_smbus_read_byte_data(client,
 425                                                 ADM1021_REG_STATUS) & 0x7c;
 426                 if (data->type == adm1023) {
 427                         data->remote_temp_prec =
 428                                 i2c_smbus_read_byte_data(client,
 429                                                 ADM1023_REG_REM_TEMP_PREC);
 430                         data->remote_temp_os_prec =
 431                                 i2c_smbus_read_byte_data(client,
 432                                                 ADM1023_REG_REM_TOS_PREC);
 433                         data->remote_temp_hyst_prec =
 434                                 i2c_smbus_read_byte_data(client,
 435                                                 ADM1023_REG_REM_THYST_PREC);
 436                         data->remote_temp_offset =
 437                                 i2c_smbus_read_byte_data(client,
 438                                                 ADM1023_REG_REM_OFFSET);
 439                         data->remote_temp_offset_prec =
 440                                 i2c_smbus_read_byte_data(client,
 441                                                 ADM1023_REG_REM_OFFSET_PREC);
 442                 }
 443                 data->last_updated = jiffies;
 444                 data->valid = 1;
 445         }
 446
 447         mutex_unlock(&data->update_lock);
 448
 449         return data;
 450 }
 451
 452 static int __init sensors_adm1021_init(void)
 453 {
 454         return i2c_add_driver(&adm1021_driver);
 455 }
 456
 457 static void __exit sensors_adm1021_exit(void)
 458 {
 459         i2c_del_driver(&adm1021_driver);
 460 }
 461
 462 MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl> and "
 463                 "Philip Edelbrock <phil@netroedge.com>");
 464 MODULE_DESCRIPTION("adm1021 driver");
 465 MODULE_LICENSE("GPL");
 466
 467 module_param(read_only, bool, 0);
 468 MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
 469
 470 module_init(sensors_adm1021_init)
 471 module_exit(sensors_adm1021_exit)