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 I2C_CLIENT_INSMOD_2(thmc50, adm1022);
  39 I2C_CLIENT_MODULE_PARM(adm1022_temp3, "List of adapter,address pairs "
  40                         "to enable 3rd temperature (ADM1022 only)");
  41
  42 /* Many THMC50 constants specified below */
  43
  44 /* The THMC50 registers */
  45 #define THMC50_REG_CONF                         0x40
  46 #define THMC50_REG_COMPANY_ID                   0x3E
  47 #define THMC50_REG_DIE_CODE                     0x3F
  48 #define THMC50_REG_ANALOG_OUT                   0x19
  49 /*
  50  * The mirror status register cannot be used as
  51  * reading it does not clear alarms.
  52  */
  53 #define THMC50_REG_INTR                         0x41
  54
  55 static const u8 THMC50_REG_TEMP[] = { 0x27, 0x26, 0x20 };
  56 static const u8 THMC50_REG_TEMP_MIN[] = { 0x3A, 0x38, 0x2C };
  57 static const u8 THMC50_REG_TEMP_MAX[] = { 0x39, 0x37, 0x2B };
  58
  59 #define THMC50_REG_CONF_nFANOFF                 0x20
  60
  61 /* Each client has this additional data */
  62 struct thmc50_data {
  63         struct device *hwmon_dev;
  64
  65         struct mutex update_lock;
  66         enum chips type;
  67         unsigned long last_updated;     /* In jiffies */
  68         char has_temp3;         /* !=0 if it is ADM1022 in temp3 mode */
  69         char valid;             /* !=0 if following fields are valid */
  70
  71         /* Register values */
  72         s8 temp_input[3];
  73         s8 temp_max[3];
  74         s8 temp_min[3];
  75         u8 analog_out;
  76         u8 alarms;
  77 };
  78
  79 static int thmc50_detect(struct i2c_client *client, int kind,
  80                          struct i2c_board_info *info);
  81 static int thmc50_probe(struct i2c_client *client,
  82                         const struct i2c_device_id *id);
  83 static int thmc50_remove(struct i2c_client *client);
  84 static void thmc50_init_client(struct i2c_client *client);
  85 static struct thmc50_data *thmc50_update_device(struct device *dev);
  86
  87 static const struct i2c_device_id thmc50_id[] = {
  88         { "adm1022", adm1022 },
  89         { "thmc50", thmc50 },
  90         { }
  91 };
  92 MODULE_DEVICE_TABLE(i2c, thmc50_id);
  93
  94 static struct i2c_driver thmc50_driver = {
  95         .class = I2C_CLASS_HWMON,
  96         .driver = {
  97                 .name = "thmc50",
  98         },
  99         .probe = thmc50_probe,
 100         .remove = thmc50_remove,
 101         .id_table = thmc50_id,
 102         .detect = thmc50_detect,
 103         .address_data = &addr_data,
 104 };
 105
 106 static ssize_t show_analog_out(struct device *dev,
 107                                struct device_attribute *attr, char *buf)
 108 {
 109         struct thmc50_data *data = thmc50_update_device(dev);
 110         return sprintf(buf, "%d\n", data->analog_out);
 111 }
 112
 113 static ssize_t set_analog_out(struct device *dev,
 114                               struct device_attribute *attr,
 115                               const char *buf, size_t count)
 116 {
 117         struct i2c_client *client = to_i2c_client(dev);
 118         struct thmc50_data *data = i2c_get_clientdata(client);
 119         int tmp = simple_strtoul(buf, NULL, 10);
 120         int config;
 121
 122         mutex_lock(&data->update_lock);
 123         data->analog_out = SENSORS_LIMIT(tmp, 0, 255);
 124         i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
 125                                   data->analog_out);
 126
 127         config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
 128         if (data->analog_out == 0)
 129                 config &= ~THMC50_REG_CONF_nFANOFF;
 130         else
 131                 config |= THMC50_REG_CONF_nFANOFF;
 132         i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
 133
 134         mutex_unlock(&data->update_lock);
 135         return count;
 136 }
 137
 138 /* There is only one PWM mode = DC */
 139 static ssize_t show_pwm_mode(struct device *dev, struct device_attribute *attr,
 140                              char *buf)
 141 {
 142         return sprintf(buf, "0\n");
 143 }
 144
 145 /* Temperatures */
 146 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 147                          char *buf)
 148 {
 149         int nr = to_sensor_dev_attr(attr)->index;
 150         struct thmc50_data *data = thmc50_update_device(dev);
 151         return sprintf(buf, "%d\n", data->temp_input[nr] * 1000);
 152 }
 153
 154 static ssize_t show_temp_min(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_min[nr] * 1000);
 160 }
 161
 162 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 163                             const char *buf, size_t count)
 164 {
 165         int nr = to_sensor_dev_attr(attr)->index;
 166         struct i2c_client *client = to_i2c_client(dev);
 167         struct thmc50_data *data = i2c_get_clientdata(client);
 168         int val = simple_strtol(buf, NULL, 10);
 169
 170         mutex_lock(&data->update_lock);
 171         data->temp_min[nr] = SENSORS_LIMIT(val / 1000, -128, 127);
 172         i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MIN[nr],
 173                                   data->temp_min[nr]);
 174         mutex_unlock(&data->update_lock);
 175         return count;
 176 }
 177
 178 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
 179                              char *buf)
 180 {
 181         int nr = to_sensor_dev_attr(attr)->index;
 182         struct thmc50_data *data = thmc50_update_device(dev);
 183         return sprintf(buf, "%d\n", data->temp_max[nr] * 1000);
 184 }
 185
 186 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 187                             const char *buf, size_t count)
 188 {
 189         int nr = to_sensor_dev_attr(attr)->index;
 190         struct i2c_client *client = to_i2c_client(dev);
 191         struct thmc50_data *data = i2c_get_clientdata(client);
 192         int val = simple_strtol(buf, NULL, 10);
 193
 194         mutex_lock(&data->update_lock);
 195         data->temp_max[nr] = SENSORS_LIMIT(val / 1000, -128, 127);
 196         i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MAX[nr],
 197                                   data->temp_max[nr]);
 198         mutex_unlock(&data->update_lock);
 199         return count;
 200 }
 201
 202 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 203                           char *buf)
 204 {
 205         int index = to_sensor_dev_attr(attr)->index;
 206         struct thmc50_data *data = thmc50_update_device(dev);
 207
 208         return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
 209 }
 210
 211 #define temp_reg(offset)                                                \
 212 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp,     \
 213                         NULL, offset - 1);                              \
 214 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,        \
 215                         show_temp_min, set_temp_min, offset - 1);       \
 216 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,        \
 217                         show_temp_max, set_temp_max, offset - 1);
 218
 219 temp_reg(1);
 220 temp_reg(2);
 221 temp_reg(3);
 222
 223 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0);
 224 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
 225 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 1);
 226 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 7);
 227 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
 228
 229 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_analog_out,
 230                           set_analog_out, 0);
 231 static SENSOR_DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL, 0);
 232
 233 static struct attribute *thmc50_attributes[] = {
 234         &sensor_dev_attr_temp1_max.dev_attr.attr,
 235         &sensor_dev_attr_temp1_min.dev_attr.attr,
 236         &sensor_dev_attr_temp1_input.dev_attr.attr,
 237         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 238         &sensor_dev_attr_temp2_max.dev_attr.attr,
 239         &sensor_dev_attr_temp2_min.dev_attr.attr,
 240         &sensor_dev_attr_temp2_input.dev_attr.attr,
 241         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 242         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 243         &sensor_dev_attr_pwm1.dev_attr.attr,
 244         &sensor_dev_attr_pwm1_mode.dev_attr.attr,
 245         NULL
 246 };
 247
 248 static const struct attribute_group thmc50_group = {
 249         .attrs = thmc50_attributes,
 250 };
 251
 252 /* for ADM1022 3rd temperature mode */
 253 static struct attribute *temp3_attributes[] = {
 254         &sensor_dev_attr_temp3_max.dev_attr.attr,
 255         &sensor_dev_attr_temp3_min.dev_attr.attr,
 256         &sensor_dev_attr_temp3_input.dev_attr.attr,
 257         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 258         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 259         NULL
 260 };
 261
 262 static const struct attribute_group temp3_group = {
 263         .attrs = temp3_attributes,
 264 };
 265
 266 /* Return 0 if detection is successful, -ENODEV otherwise */
 267 static int thmc50_detect(struct i2c_client *client, int kind,
 268                          struct i2c_board_info *info)
 269 {
 270         unsigned company;
 271         unsigned revision;
 272         unsigned config;
 273         struct i2c_adapter *adapter = client->adapter;
 274         int err = 0;
 275         const char *type_name;
 276
 277         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 278                 pr_debug("thmc50: detect failed, "
 279                          "smbus byte data not supported!\n");
 280                 return -ENODEV;
 281         }
 282
 283         pr_debug("thmc50: Probing for THMC50 at 0x%2X on bus %d\n",
 284                  client->addr, i2c_adapter_id(client->adapter));
 285
 286         /* Now, we do the remaining detection. */
 287         company = i2c_smbus_read_byte_data(client, THMC50_REG_COMPANY_ID);
 288         revision = i2c_smbus_read_byte_data(client, THMC50_REG_DIE_CODE);
 289         config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
 290
 291         if (kind == 0)
 292                 kind = thmc50;
 293         else if (kind < 0) {
 294                 err = -ENODEV;
 295                 if (revision >= 0xc0 && ((config & 0x10) == 0)) {
 296                         if (company == 0x49) {
 297                                 kind = thmc50;
 298                                 err = 0;
 299                         } else if (company == 0x41) {
 300                                 kind = adm1022;
 301                                 err = 0;
 302                         }
 303                 }
 304         }
 305         if (err == -ENODEV) {
 306                 pr_debug("thmc50: Detection of THMC50/ADM1022 failed\n");
 307                 return err;
 308         }
 309
 310         if (kind == adm1022) {
 311                 int id = i2c_adapter_id(client->adapter);
 312                 int i;
 313
 314                 type_name = "adm1022";
 315                 for (i = 0; i + 1 < adm1022_temp3_num; i += 2)
 316                         if (adm1022_temp3[i] == id &&
 317                             adm1022_temp3[i + 1] == client->addr) {
 318                                 /* enable 2nd remote temp */
 319                                 config |= (1 << 7);
 320                                 i2c_smbus_write_byte_data(client,
 321                                                           THMC50_REG_CONF,
 322                                                           config);
 323                                 break;
 324                         }
 325         } else {
 326                 type_name = "thmc50";
 327         }
 328         pr_debug("thmc50: Detected %s (version %x, revision %x)\n",
 329                  type_name, (revision >> 4) - 0xc, revision & 0xf);
 330
 331         strlcpy(info->type, type_name, I2C_NAME_SIZE);
 332
 333         return 0;
 334 }
 335
 336 static int thmc50_probe(struct i2c_client *client,
 337                         const struct i2c_device_id *id)
 338 {
 339         struct thmc50_data *data;
 340         int err;
 341
 342         data = kzalloc(sizeof(struct thmc50_data), GFP_KERNEL);
 343         if (!data) {
 344                 pr_debug("thmc50: detect failed, kzalloc failed!\n");
 345                 err = -ENOMEM;
 346                 goto exit;
 347         }
 348
 349         i2c_set_clientdata(client, data);
 350         data->type = id->driver_data;
 351         mutex_init(&data->update_lock);
 352
 353         thmc50_init_client(client);
 354
 355         /* Register sysfs hooks */
 356         if ((err = sysfs_create_group(&client->dev.kobj, &thmc50_group)))
 357                 goto exit_free;
 358
 359         /* Register ADM1022 sysfs hooks */
 360         if (data->has_temp3)
 361                 if ((err = sysfs_create_group(&client->dev.kobj,
 362                                               &temp3_group)))
 363                         goto exit_remove_sysfs_thmc50;
 364
 365         /* Register a new directory entry with module sensors */
 366         data->hwmon_dev = hwmon_device_register(&client->dev);
 367         if (IS_ERR(data->hwmon_dev)) {
 368                 err = PTR_ERR(data->hwmon_dev);
 369                 goto exit_remove_sysfs;
 370         }
 371
 372         return 0;
 373
 374 exit_remove_sysfs:
 375         if (data->has_temp3)
 376                 sysfs_remove_group(&client->dev.kobj, &temp3_group);
 377 exit_remove_sysfs_thmc50:
 378         sysfs_remove_group(&client->dev.kobj, &thmc50_group);
 379 exit_free:
 380         kfree(data);
 381 exit:
 382         return err;
 383 }
 384
 385 static int thmc50_remove(struct i2c_client *client)
 386 {
 387         struct thmc50_data *data = i2c_get_clientdata(client);
 388
 389         hwmon_device_unregister(data->hwmon_dev);
 390         sysfs_remove_group(&client->dev.kobj, &thmc50_group);
 391         if (data->has_temp3)
 392                 sysfs_remove_group(&client->dev.kobj, &temp3_group);
 393
 394         kfree(data);
 395
 396         return 0;
 397 }
 398
 399 static void thmc50_init_client(struct i2c_client *client)
 400 {
 401         struct thmc50_data *data = i2c_get_clientdata(client);
 402         int config;
 403
 404         data->analog_out = i2c_smbus_read_byte_data(client,
 405                                                     THMC50_REG_ANALOG_OUT);
 406         /* set up to at least 1 */
 407         if (data->analog_out == 0) {
 408                 data->analog_out = 1;
 409                 i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
 410                                           data->analog_out);
 411         }
 412         config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
 413         config |= 0x1;  /* start the chip if it is in standby mode */
 414         if (data->type == adm1022 && (config & (1 << 7)))
 415                 data->has_temp3 = 1;
 416         i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
 417 }
 418
 419 static struct thmc50_data *thmc50_update_device(struct device *dev)
 420 {
 421         struct i2c_client *client = to_i2c_client(dev);
 422         struct thmc50_data *data = i2c_get_clientdata(client);
 423         int timeout = HZ / 5 + (data->type == thmc50 ? HZ : 0);
 424
 425         mutex_lock(&data->update_lock);
 426
 427         if (time_after(jiffies, data->last_updated + timeout)
 428             || !data->valid) {
 429
 430                 int temps = data->has_temp3 ? 3 : 2;
 431                 int i;
 432                 for (i = 0; i < temps; i++) {
 433                         data->temp_input[i] = i2c_smbus_read_byte_data(client,
 434                                                 THMC50_REG_TEMP[i]);
 435                         data->temp_max[i] = i2c_smbus_read_byte_data(client,
 436                                                 THMC50_REG_TEMP_MAX[i]);
 437                         data->temp_min[i] = i2c_smbus_read_byte_data(client,
 438                                                 THMC50_REG_TEMP_MIN[i]);
 439                 }
 440                 data->analog_out =
 441                     i2c_smbus_read_byte_data(client, THMC50_REG_ANALOG_OUT);
 442                 data->alarms =
 443                     i2c_smbus_read_byte_data(client, THMC50_REG_INTR);
 444                 data->last_updated = jiffies;
 445                 data->valid = 1;
 446         }
 447
 448         mutex_unlock(&data->update_lock);
 449
 450         return data;
 451 }
 452
 453 static int __init sm_thmc50_init(void)
 454 {
 455         return i2c_add_driver(&thmc50_driver);
 456 }
 457
 458 static void __exit sm_thmc50_exit(void)
 459 {
 460         i2c_del_driver(&thmc50_driver);
 461 }
 462
 463 MODULE_AUTHOR("Krzysztof Helt <krzysztof.h1@wp.pl>");
 464 MODULE_DESCRIPTION("THMC50 driver");
 465
 466 module_init(sm_thmc50_init);
 467 module_exit(sm_thmc50_exit);