drivers/hwmon/thmc50.c

   1 /*
   2     thmc50.c - Part of lm_sensors, Linux kernel modules for hardware
   3              monitoring
   4     Copyright (C) 2007 Krzysztof Helt <krzysztof.h1@wp.pl>
   5     Based on 2.4 driver by Frodo Looijaard <frodol@dds.nl> and
   6     Philip Edelbrock <phil@netroedge.com>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program; if not, write to the Free Software
  20     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.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 MODULE_LICENSE("GPL");
  33
  34 /* Addresses to scan */
  35 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
  36
  37 /* Insmod parameters */
  38 enum chips { thmc50, adm1022 };
  39
  40 static unsigned short adm1022_temp3[16];
  41 static unsigned int adm1022_temp3_num;
  42 module_param_array(adm1022_temp3, ushort, &adm1022_temp3_num, 0);
  43 MODULE_PARM_DESC(adm1022_temp3, "List of adapter,address pairs "
  44                         "to enable 3rd temperature (ADM1022 only)");
  45
  46 /* Many THMC50 constants specified below */
  47
  48 /* The THMC50 registers */
  49 #define THMC50_REG_CONF                         0x40
  50 #define THMC50_REG_COMPANY_ID                   0x3E
  51 #define THMC50_REG_DIE_CODE                     0x3F
  52 #define THMC50_REG_ANALOG_OUT                   0x19
  53 /*
  54  * The mirror status register cannot be used as
  55  * reading it does not clear alarms.
  56  */
  57 #define THMC50_REG_INTR                         0x41
  58
  59 static const u8 THMC50_REG_TEMP[] = { 0x27, 0x26, 0x20 };
  60 static const u8 THMC50_REG_TEMP_MIN[] = { 0x3A, 0x38, 0x2C };
  61 static const u8 THMC50_REG_TEMP_MAX[] = { 0x39, 0x37, 0x2B };
  62 static const u8 THMC50_REG_TEMP_CRITICAL[] = { 0x13, 0x14, 0x14 };
  63 static const u8 THMC50_REG_TEMP_DEFAULT[] = { 0x17, 0x18, 0x18 };
  64
  65 #define THMC50_REG_CONF_nFANOFF                 0x20
  66 #define THMC50_REG_CONF_PROGRAMMED              0x08
  67
  68 /* Each client has this additional data */
  69 struct thmc50_data {
  70         struct device *hwmon_dev;
  71
  72         struct mutex update_lock;
  73         enum chips type;
  74         unsigned long last_updated;     /* In jiffies */
  75         char has_temp3;         /* !=0 if it is ADM1022 in temp3 mode */
  76         char valid;             /* !=0 if following fields are valid */
  77
  78         /* Register values */
  79         s8 temp_input[3];
  80         s8 temp_max[3];
  81         s8 temp_min[3];
  82         s8 temp_critical[3];
  83         u8 analog_out;
  84         u8 alarms;
  85 };
  86
  87 static int thmc50_detect(struct i2c_client *client,
  88                          struct i2c_board_info *info);
  89 static int thmc50_probe(struct i2c_client *client,
  90                         const struct i2c_device_id *id);
  91 static int thmc50_remove(struct i2c_client *client);
  92 static void thmc50_init_client(struct i2c_client *client);
  93 static struct thmc50_data *thmc50_update_device(struct device *dev);
  94
  95 static const struct i2c_device_id thmc50_id[] = {
  96         { "adm1022", adm1022 },
  97         { "thmc50", thmc50 },
  98         { }
  99 };
 100 MODULE_DEVICE_TABLE(i2c, thmc50_id);
 101
 102 static struct i2c_driver thmc50_driver = {
 103         .class = I2C_CLASS_HWMON,
 104         .driver = {
 105                 .name = "thmc50",
 106         },
 107         .probe = thmc50_probe,
 108         .remove = thmc50_remove,
 109         .id_table = thmc50_id,
 110         .detect = thmc50_detect,
 111         .address_list = normal_i2c,
 112 };
 113
 114 static ssize_t show_analog_out(struct device *dev,
 115                                struct device_attribute *attr, char *buf)
 116 {
 117         struct thmc50_data *data = thmc50_update_device(dev);
 118         return sprintf(buf, "%d\n", data->analog_out);
 119 }
 120
 121 static ssize_t set_analog_out(struct device *dev,
 122                               struct device_attribute *attr,
 123                               const char *buf, size_t count)
 124 {
 125         struct i2c_client *client = to_i2c_client(dev);
 126         struct thmc50_data *data = i2c_get_clientdata(client);
 127         int tmp = simple_strtoul(buf, NULL, 10);
 128         int config;
 129
 130         mutex_lock(&data->update_lock);
 131         data->analog_out = SENSORS_LIMIT(tmp, 0, 255);
 132         i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
 133                                   data->analog_out);
 134
 135         config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
 136         if (data->analog_out == 0)
 137                 config &= ~THMC50_REG_CONF_nFANOFF;
 138         else
 139                 config |= THMC50_REG_CONF_nFANOFF;
 140         i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
 141
 142         mutex_unlock(&data->update_lock);
 143         return count;
 144 }
 145
 146 /* There is only one PWM mode = DC */
 147 static ssize_t show_pwm_mode(struct device *dev, struct device_attribute *attr,
 148                              char *buf)
 149 {
 150         return sprintf(buf, "0\n");
 151 }
 152
 153 /* Temperatures */
 154 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 155                          char *buf)
 156 {
 157         int nr = to_sensor_dev_attr(attr)->index;
 158         struct thmc50_data *data = thmc50_update_device(dev);
 159         return sprintf(buf, "%d\n", data->temp_input[nr] * 1000);
 160 }
 161
 162 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
 163                              char *buf)
 164 {
 165         int nr = to_sensor_dev_attr(attr)->index;
 166         struct thmc50_data *data = thmc50_update_device(dev);
 167         return sprintf(buf, "%d\n", data->temp_min[nr] * 1000);
 168 }
 169
 170 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 171                             const char *buf, size_t count)
 172 {
 173         int nr = to_sensor_dev_attr(attr)->index;
 174         struct i2c_client *client = to_i2c_client(dev);
 175         struct thmc50_data *data = i2c_get_clientdata(client);
 176         int val = simple_strtol(buf, NULL, 10);
 177
 178         mutex_lock(&data->update_lock);
 179         data->temp_min[nr] = SENSORS_LIMIT(val / 1000, -128, 127);
 180         i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MIN[nr],
 181                                   data->temp_min[nr]);
 182         mutex_unlock(&data->update_lock);
 183         return count;
 184 }
 185
 186 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
 187                              char *buf)
 188 {
 189         int nr = to_sensor_dev_attr(attr)->index;
 190         struct thmc50_data *data = thmc50_update_device(dev);
 191         return sprintf(buf, "%d\n", data->temp_max[nr] * 1000);
 192 }
 193
 194 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 195                             const char *buf, size_t count)
 196 {
 197         int nr = to_sensor_dev_attr(attr)->index;
 198         struct i2c_client *client = to_i2c_client(dev);
 199         struct thmc50_data *data = i2c_get_clientdata(client);
 200         int val = simple_strtol(buf, NULL, 10);
 201
 202         mutex_lock(&data->update_lock);
 203         data->temp_max[nr] = SENSORS_LIMIT(val / 1000, -128, 127);
 204         i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MAX[nr],
 205                                   data->temp_max[nr]);
 206         mutex_unlock(&data->update_lock);
 207         return count;
 208 }
 209
 210 static ssize_t show_temp_critical(struct device *dev,
 211                                   struct device_attribute *attr,
 212                                   char *buf)
 213 {
 214         int nr = to_sensor_dev_attr(attr)->index;
 215         struct thmc50_data *data = thmc50_update_device(dev);
 216         return sprintf(buf, "%d\n", data->temp_critical[nr] * 1000);
 217 }
 218
 219 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 220                           char *buf)
 221 {
 222         int index = to_sensor_dev_attr(attr)->index;
 223         struct thmc50_data *data = thmc50_update_device(dev);
 224
 225         return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
 226 }
 227
 228 #define temp_reg(offset)                                                \
 229 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp,     \
 230                         NULL, offset - 1);                              \
 231 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,        \
 232                         show_temp_min, set_temp_min, offset - 1);       \
 233 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,        \
 234                         show_temp_max, set_temp_max, offset - 1);       \
 235 static SENSOR_DEVICE_ATTR(temp##offset##_crit, S_IRUGO,                 \
 236                         show_temp_critical, NULL, offset - 1);
 237
 238 temp_reg(1);
 239 temp_reg(2);
 240 temp_reg(3);
 241
 242 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0);
 243 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
 244 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 1);
 245 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 7);
 246 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
 247
 248 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_analog_out,
 249                           set_analog_out, 0);
 250 static SENSOR_DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL, 0);
 251
 252 static struct attribute *thmc50_attributes[] = {
 253         &sensor_dev_attr_temp1_max.dev_attr.attr,
 254         &sensor_dev_attr_temp1_min.dev_attr.attr,
 255         &sensor_dev_attr_temp1_input.dev_attr.attr,
 256         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 257         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 258         &sensor_dev_attr_temp2_max.dev_attr.attr,
 259         &sensor_dev_attr_temp2_min.dev_attr.attr,
 260         &sensor_dev_attr_temp2_input.dev_attr.attr,
 261         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 262         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 263         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 264         &sensor_dev_attr_pwm1.dev_attr.attr,
 265         &sensor_dev_attr_pwm1_mode.dev_attr.attr,
 266         NULL
 267 };
 268
 269 static const struct attribute_group thmc50_group = {
 270         .attrs = thmc50_attributes,
 271 };
 272
 273 /* for ADM1022 3rd temperature mode */
 274 static struct attribute *temp3_attributes[] = {
 275         &sensor_dev_attr_temp3_max.dev_attr.attr,
 276         &sensor_dev_attr_temp3_min.dev_attr.attr,
 277         &sensor_dev_attr_temp3_input.dev_attr.attr,
 278         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 279         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 280         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 281         NULL
 282 };
 283
 284 static const struct attribute_group temp3_group = {
 285         .attrs = temp3_attributes,
 286 };
 287
 288 /* Return 0 if detection is successful, -ENODEV otherwise */
 289 static int thmc50_detect(struct i2c_client *client,
 290                          struct i2c_board_info *info)
 291 {
 292         unsigned company;
 293         unsigned revision;
 294         unsigned config;
 295         struct i2c_adapter *adapter = client->adapter;
 296         const char *type_name;
 297
 298         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 299                 pr_debug("thmc50: detect failed, "
 300                          "smbus byte data not supported!\n");
 301                 return -ENODEV;
 302         }
 303
 304         pr_debug("thmc50: Probing for THMC50 at 0x%2X on bus %d\n",
 305                  client->addr, i2c_adapter_id(client->adapter));
 306
 307         company = i2c_smbus_read_byte_data(client, THMC50_REG_COMPANY_ID);
 308         revision = i2c_smbus_read_byte_data(client, THMC50_REG_DIE_CODE);
 309         config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
 310         if (revision < 0xc0 || (config & 0x10))
 311                 return -ENODEV;
 312
 313         if (company == 0x41) {
 314                 int id = i2c_adapter_id(client->adapter);
 315                 int i;
 316
 317                 type_name = "adm1022";
 318                 for (i = 0; i + 1 < adm1022_temp3_num; i += 2)
 319                         if (adm1022_temp3[i] == id &&
 320                             adm1022_temp3[i + 1] == client->addr) {
 321                                 /* enable 2nd remote temp */
 322                                 config |= (1 << 7);
 323                                 i2c_smbus_write_byte_data(client,
 324                                                           THMC50_REG_CONF,
 325                                                           config);
 326                                 break;
 327                         }
 328         } else if (company == 0x49) {
 329                 type_name = "thmc50";
 330         } else {
 331                 pr_debug("thmc50: Detection of THMC50/ADM1022 failed\n");
 332                 return -ENODEV;
 333         }
 334
 335         pr_debug("thmc50: Detected %s (version %x, revision %x)\n",
 336                  type_name, (revision >> 4) - 0xc, revision & 0xf);
 337
 338         strlcpy(info->type, type_name, I2C_NAME_SIZE);
 339
 340         return 0;
 341 }
 342
 343 static int thmc50_probe(struct i2c_client *client,
 344                         const struct i2c_device_id *id)
 345 {
 346         struct thmc50_data *data;
 347         int err;
 348
 349         data = kzalloc(sizeof(struct thmc50_data), GFP_KERNEL);
 350         if (!data) {
 351                 pr_debug("thmc50: detect failed, kzalloc failed!\n");
 352                 err = -ENOMEM;
 353                 goto exit;
 354         }
 355
 356         i2c_set_clientdata(client, data);
 357         data->type = id->driver_data;
 358         mutex_init(&data->update_lock);
 359
 360         thmc50_init_client(client);
 361
 362         /* Register sysfs hooks */
 363         if ((err = sysfs_create_group(&client->dev.kobj, &thmc50_group)))
 364                 goto exit_free;
 365
 366         /* Register ADM1022 sysfs hooks */
 367         if (data->has_temp3)
 368                 if ((err = sysfs_create_group(&client->dev.kobj,
 369                                               &temp3_group)))
 370                         goto exit_remove_sysfs_thmc50;
 371
 372         /* Register a new directory entry with module sensors */
 373         data->hwmon_dev = hwmon_device_register(&client->dev);
 374         if (IS_ERR(data->hwmon_dev)) {
 375                 err = PTR_ERR(data->hwmon_dev);
 376                 goto exit_remove_sysfs;
 377         }
 378
 379         return 0;
 380
 381 exit_remove_sysfs:
 382         if (data->has_temp3)
 383                 sysfs_remove_group(&client->dev.kobj, &temp3_group);
 384 exit_remove_sysfs_thmc50:
 385         sysfs_remove_group(&client->dev.kobj, &thmc50_group);
 386 exit_free:
 387         kfree(data);
 388 exit:
 389         return err;
 390 }
 391
 392 static int thmc50_remove(struct i2c_client *client)
 393 {
 394         struct thmc50_data *data = i2c_get_clientdata(client);
 395
 396         hwmon_device_unregister(data->hwmon_dev);
 397         sysfs_remove_group(&client->dev.kobj, &thmc50_group);
 398         if (data->has_temp3)
 399                 sysfs_remove_group(&client->dev.kobj, &temp3_group);
 400
 401         kfree(data);
 402
 403         return 0;
 404 }
 405
 406 static void thmc50_init_client(struct i2c_client *client)
 407 {
 408         struct thmc50_data *data = i2c_get_clientdata(client);
 409         int config;
 410
 411         data->analog_out = i2c_smbus_read_byte_data(client,
 412                                                     THMC50_REG_ANALOG_OUT);
 413         /* set up to at least 1 */
 414         if (data->analog_out == 0) {
 415                 data->analog_out = 1;
 416                 i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
 417                                           data->analog_out);
 418         }
 419         config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
 420         config |= 0x1;  /* start the chip if it is in standby mode */
 421         if (data->type == adm1022 && (config & (1 << 7)))
 422                 data->has_temp3 = 1;
 423         i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
 424 }
 425
 426 static struct thmc50_data *thmc50_update_device(struct device *dev)
 427 {
 428         struct i2c_client *client = to_i2c_client(dev);
 429         struct thmc50_data *data = i2c_get_clientdata(client);
 430         int timeout = HZ / 5 + (data->type == thmc50 ? HZ : 0);
 431
 432         mutex_lock(&data->update_lock);
 433
 434         if (time_after(jiffies, data->last_updated + timeout)
 435             || !data->valid) {
 436
 437                 int temps = data->has_temp3 ? 3 : 2;
 438                 int i;
 439                 int prog = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
 440
 441                 prog &= THMC50_REG_CONF_PROGRAMMED;
 442
 443                 for (i = 0; i < temps; i++) {
 444                         data->temp_input[i] = i2c_smbus_read_byte_data(client,
 445                                                 THMC50_REG_TEMP[i]);
 446                         data->temp_max[i] = i2c_smbus_read_byte_data(client,
 447                                                 THMC50_REG_TEMP_MAX[i]);
 448                         data->temp_min[i] = i2c_smbus_read_byte_data(client,
 449                                                 THMC50_REG_TEMP_MIN[i]);
 450                         data->temp_critical[i] =
 451                                 i2c_smbus_read_byte_data(client,
 452                                         prog ? THMC50_REG_TEMP_CRITICAL[i]
 453                                              : THMC50_REG_TEMP_DEFAULT[i]);
 454                 }
 455                 data->analog_out =
 456                     i2c_smbus_read_byte_data(client, THMC50_REG_ANALOG_OUT);
 457                 data->alarms =
 458                     i2c_smbus_read_byte_data(client, THMC50_REG_INTR);
 459                 data->last_updated = jiffies;
 460                 data->valid = 1;
 461         }
 462
 463         mutex_unlock(&data->update_lock);
 464
 465         return data;
 466 }
 467
 468 static int __init sm_thmc50_init(void)
 469 {
 470         return i2c_add_driver(&thmc50_driver);
 471 }
 472
 473 static void __exit sm_thmc50_exit(void)
 474 {
 475         i2c_del_driver(&thmc50_driver);
 476 }
 477
 478 MODULE_AUTHOR("Krzysztof Helt <krzysztof.h1@wp.pl>");
 479 MODULE_DESCRIPTION("THMC50 driver");
 480
 481 module_init(sm_thmc50_init);
 482 module_exit(sm_thmc50_exit);