drivers/hwmon/emc1403.c

   1 /*
   2  * emc1403.c - SMSC Thermal Driver
   3  *
   4  * Copyright (C) 2008 Intel Corp
   5  *
   6  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   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; version 2 of the License.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  20  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  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/sysfs.h>
  31 #include <linux/mutex.h>
  32 #include <linux/regmap.h>
  33
  34 #define THERMAL_PID_REG         0xfd
  35 #define THERMAL_SMSC_ID_REG     0xfe
  36 #define THERMAL_REVISION_REG    0xff
  37
  38 enum emc1403_chip { emc1402, emc1403, emc1404 };
  39
  40 struct thermal_data {
  41         struct regmap *regmap;
  42         struct mutex mutex;
  43         const struct attribute_group *groups[4];
  44 };
  45
  46 static ssize_t temp_show(struct device *dev, struct device_attribute *attr,
  47                          char *buf)
  48 {
  49         struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
  50         struct thermal_data *data = dev_get_drvdata(dev);
  51         unsigned int val;
  52         int retval;
  53
  54         retval = regmap_read(data->regmap, sda->index, &val);
  55         if (retval < 0)
  56                 return retval;
  57         return sprintf(buf, "%d000\n", val);
  58 }
  59
  60 static ssize_t bit_show(struct device *dev, struct device_attribute *attr,
  61                         char *buf)
  62 {
  63         struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
  64         struct thermal_data *data = dev_get_drvdata(dev);
  65         unsigned int val;
  66         int retval;
  67
  68         retval = regmap_read(data->regmap, sda->nr, &val);
  69         if (retval < 0)
  70                 return retval;
  71         return sprintf(buf, "%d\n", !!(val & sda->index));
  72 }
  73
  74 static ssize_t temp_store(struct device *dev, struct device_attribute *attr,
  75                           const char *buf, size_t count)
  76 {
  77         struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
  78         struct thermal_data *data = dev_get_drvdata(dev);
  79         unsigned long val;
  80         int retval;
  81
  82         if (kstrtoul(buf, 10, &val))
  83                 return -EINVAL;
  84         retval = regmap_write(data->regmap, sda->index,
  85                               DIV_ROUND_CLOSEST(val, 1000));
  86         if (retval < 0)
  87                 return retval;
  88         return count;
  89 }
  90
  91 static ssize_t bit_store(struct device *dev, struct device_attribute *attr,
  92                          const char *buf, size_t count)
  93 {
  94         struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
  95         struct thermal_data *data = dev_get_drvdata(dev);
  96         unsigned long val;
  97         int retval;
  98
  99         if (kstrtoul(buf, 10, &val))
 100                 return -EINVAL;
 101
 102         retval = regmap_update_bits(data->regmap, sda->nr, sda->index,
 103                                     val ? sda->index : 0);
 104         if (retval < 0)
 105                 return retval;
 106         return count;
 107 }
 108
 109 static ssize_t show_hyst_common(struct device *dev,
 110                                 struct device_attribute *attr, char *buf,
 111                                 bool is_min)
 112 {
 113         struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
 114         struct thermal_data *data = dev_get_drvdata(dev);
 115         struct regmap *regmap = data->regmap;
 116         unsigned int limit;
 117         unsigned int hyst;
 118         int retval;
 119
 120         retval = regmap_read(regmap, sda->index, &limit);
 121         if (retval < 0)
 122                 return retval;
 123
 124         retval = regmap_read(regmap, 0x21, &hyst);
 125         if (retval < 0)
 126                 return retval;
 127
 128         return sprintf(buf, "%d000\n", is_min ? limit + hyst : limit - hyst);
 129 }
 130
 131 static ssize_t hyst_show(struct device *dev, struct device_attribute *attr,
 132                          char *buf)
 133 {
 134         return show_hyst_common(dev, attr, buf, false);
 135 }
 136
 137 static ssize_t min_hyst_show(struct device *dev,
 138                              struct device_attribute *attr, char *buf)
 139 {
 140         return show_hyst_common(dev, attr, buf, true);
 141 }
 142
 143 static ssize_t hyst_store(struct device *dev, struct device_attribute *attr,
 144                           const char *buf, size_t count)
 145 {
 146         struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
 147         struct thermal_data *data = dev_get_drvdata(dev);
 148         struct regmap *regmap = data->regmap;
 149         unsigned int limit;
 150         int retval;
 151         int hyst;
 152         unsigned long val;
 153
 154         if (kstrtoul(buf, 10, &val))
 155                 return -EINVAL;
 156
 157         mutex_lock(&data->mutex);
 158         retval = regmap_read(regmap, sda->index, &limit);
 159         if (retval < 0)
 160                 goto fail;
 161
 162         hyst = limit * 1000 - val;
 163         hyst = clamp_val(DIV_ROUND_CLOSEST(hyst, 1000), 0, 255);
 164         retval = regmap_write(regmap, 0x21, hyst);
 165         if (retval == 0)
 166                 retval = count;
 167 fail:
 168         mutex_unlock(&data->mutex);
 169         return retval;
 170 }
 171
 172 /*
 173  *      Sensors. We pass the actual i2c register to the methods.
 174  */
 175
 176 static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, 0x06);
 177 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 0x05);
 178 static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, 0x20);
 179 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0x00);
 180 static SENSOR_DEVICE_ATTR_2_RO(temp1_min_alarm, bit, 0x36, 0x01);
 181 static SENSOR_DEVICE_ATTR_2_RO(temp1_max_alarm, bit, 0x35, 0x01);
 182 static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, bit, 0x37, 0x01);
 183 static SENSOR_DEVICE_ATTR_RO(temp1_min_hyst, min_hyst, 0x06);
 184 static SENSOR_DEVICE_ATTR_RO(temp1_max_hyst, hyst, 0x05);
 185 static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, hyst, 0x20);
 186
 187 static SENSOR_DEVICE_ATTR_RW(temp2_min, temp, 0x08);
 188 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, 0x07);
 189 static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp, 0x19);
 190 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 0x01);
 191 static SENSOR_DEVICE_ATTR_2_RO(temp2_fault, bit, 0x1b, 0x02);
 192 static SENSOR_DEVICE_ATTR_2_RO(temp2_min_alarm, bit, 0x36, 0x02);
 193 static SENSOR_DEVICE_ATTR_2_RO(temp2_max_alarm, bit, 0x35, 0x02);
 194 static SENSOR_DEVICE_ATTR_2_RO(temp2_crit_alarm, bit, 0x37, 0x02);
 195 static SENSOR_DEVICE_ATTR_RO(temp2_min_hyst, min_hyst, 0x08);
 196 static SENSOR_DEVICE_ATTR_RO(temp2_max_hyst, hyst, 0x07);
 197 static SENSOR_DEVICE_ATTR_RO(temp2_crit_hyst, hyst, 0x19);
 198
 199 static SENSOR_DEVICE_ATTR_RW(temp3_min, temp, 0x16);
 200 static SENSOR_DEVICE_ATTR_RW(temp3_max, temp, 0x15);
 201 static SENSOR_DEVICE_ATTR_RW(temp3_crit, temp, 0x1A);
 202 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 0x23);
 203 static SENSOR_DEVICE_ATTR_2_RO(temp3_fault, bit, 0x1b, 0x04);
 204 static SENSOR_DEVICE_ATTR_2_RO(temp3_min_alarm, bit, 0x36, 0x04);
 205 static SENSOR_DEVICE_ATTR_2_RO(temp3_max_alarm, bit, 0x35, 0x04);
 206 static SENSOR_DEVICE_ATTR_2_RO(temp3_crit_alarm, bit, 0x37, 0x04);
 207 static SENSOR_DEVICE_ATTR_RO(temp3_min_hyst, min_hyst, 0x16);
 208 static SENSOR_DEVICE_ATTR_RO(temp3_max_hyst, hyst, 0x15);
 209 static SENSOR_DEVICE_ATTR_RO(temp3_crit_hyst, hyst, 0x1A);
 210
 211 static SENSOR_DEVICE_ATTR_RW(temp4_min, temp, 0x2D);
 212 static SENSOR_DEVICE_ATTR_RW(temp4_max, temp, 0x2C);
 213 static SENSOR_DEVICE_ATTR_RW(temp4_crit, temp, 0x30);
 214 static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 0x2A);
 215 static SENSOR_DEVICE_ATTR_2_RO(temp4_fault, bit, 0x1b, 0x08);
 216 static SENSOR_DEVICE_ATTR_2_RO(temp4_min_alarm, bit, 0x36, 0x08);
 217 static SENSOR_DEVICE_ATTR_2_RO(temp4_max_alarm, bit, 0x35, 0x08);
 218 static SENSOR_DEVICE_ATTR_2_RO(temp4_crit_alarm, bit, 0x37, 0x08);
 219 static SENSOR_DEVICE_ATTR_RO(temp4_min_hyst, min_hyst, 0x2D);
 220 static SENSOR_DEVICE_ATTR_RO(temp4_max_hyst, hyst, 0x2C);
 221 static SENSOR_DEVICE_ATTR_RO(temp4_crit_hyst, hyst, 0x30);
 222
 223 static SENSOR_DEVICE_ATTR_2_RW(power_state, bit, 0x03, 0x40);
 224
 225 static struct attribute *emc1402_attrs[] = {
 226         &sensor_dev_attr_temp1_min.dev_attr.attr,
 227         &sensor_dev_attr_temp1_max.dev_attr.attr,
 228         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 229         &sensor_dev_attr_temp1_input.dev_attr.attr,
 230         &sensor_dev_attr_temp1_min_hyst.dev_attr.attr,
 231         &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
 232         &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
 233
 234         &sensor_dev_attr_temp2_min.dev_attr.attr,
 235         &sensor_dev_attr_temp2_max.dev_attr.attr,
 236         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 237         &sensor_dev_attr_temp2_input.dev_attr.attr,
 238         &sensor_dev_attr_temp2_min_hyst.dev_attr.attr,
 239         &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
 240         &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
 241
 242         &sensor_dev_attr_power_state.dev_attr.attr,
 243         NULL
 244 };
 245
 246 static const struct attribute_group emc1402_group = {
 247                 .attrs = emc1402_attrs,
 248 };
 249
 250 static struct attribute *emc1403_attrs[] = {
 251         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 252         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 253         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 254
 255         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 256         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 257         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 258         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 259
 260         &sensor_dev_attr_temp3_min.dev_attr.attr,
 261         &sensor_dev_attr_temp3_max.dev_attr.attr,
 262         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 263         &sensor_dev_attr_temp3_input.dev_attr.attr,
 264         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 265         &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
 266         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 267         &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 268         &sensor_dev_attr_temp3_min_hyst.dev_attr.attr,
 269         &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
 270         &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
 271         NULL
 272 };
 273
 274 static const struct attribute_group emc1403_group = {
 275         .attrs = emc1403_attrs,
 276 };
 277
 278 static struct attribute *emc1404_attrs[] = {
 279         &sensor_dev_attr_temp4_min.dev_attr.attr,
 280         &sensor_dev_attr_temp4_max.dev_attr.attr,
 281         &sensor_dev_attr_temp4_crit.dev_attr.attr,
 282         &sensor_dev_attr_temp4_input.dev_attr.attr,
 283         &sensor_dev_attr_temp4_fault.dev_attr.attr,
 284         &sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
 285         &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 286         &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
 287         &sensor_dev_attr_temp4_min_hyst.dev_attr.attr,
 288         &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
 289         &sensor_dev_attr_temp4_crit_hyst.dev_attr.attr,
 290         NULL
 291 };
 292
 293 static const struct attribute_group emc1404_group = {
 294         .attrs = emc1404_attrs,
 295 };
 296
 297 /*
 298  * EMC14x2 uses a different register and different bits to report alarm and
 299  * fault status. For simplicity, provide a separate attribute group for this
 300  * chip series.
 301  * Since we can not re-use the same attribute names, create a separate attribute
 302  * array.
 303  */
 304 static struct sensor_device_attribute_2 emc1402_alarms[] = {
 305         SENSOR_ATTR_2_RO(temp1_min_alarm, bit, 0x02, 0x20),
 306         SENSOR_ATTR_2_RO(temp1_max_alarm, bit, 0x02, 0x40),
 307         SENSOR_ATTR_2_RO(temp1_crit_alarm, bit, 0x02, 0x01),
 308
 309         SENSOR_ATTR_2_RO(temp2_fault, bit, 0x02, 0x04),
 310         SENSOR_ATTR_2_RO(temp2_min_alarm, bit, 0x02, 0x08),
 311         SENSOR_ATTR_2_RO(temp2_max_alarm, bit, 0x02, 0x10),
 312         SENSOR_ATTR_2_RO(temp2_crit_alarm, bit, 0x02, 0x02),
 313 };
 314
 315 static struct attribute *emc1402_alarm_attrs[] = {
 316         &emc1402_alarms[0].dev_attr.attr,
 317         &emc1402_alarms[1].dev_attr.attr,
 318         &emc1402_alarms[2].dev_attr.attr,
 319         &emc1402_alarms[3].dev_attr.attr,
 320         &emc1402_alarms[4].dev_attr.attr,
 321         &emc1402_alarms[5].dev_attr.attr,
 322         &emc1402_alarms[6].dev_attr.attr,
 323         NULL,
 324 };
 325
 326 static const struct attribute_group emc1402_alarm_group = {
 327         .attrs = emc1402_alarm_attrs,
 328 };
 329
 330 static int emc1403_detect(struct i2c_client *client,
 331                         struct i2c_board_info *info)
 332 {
 333         int id;
 334         /* Check if thermal chip is SMSC and EMC1403 or EMC1423 */
 335
 336         id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
 337         if (id != 0x5d)
 338                 return -ENODEV;
 339
 340         id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
 341         switch (id) {
 342         case 0x20:
 343                 strlcpy(info->type, "emc1402", I2C_NAME_SIZE);
 344                 break;
 345         case 0x21:
 346                 strlcpy(info->type, "emc1403", I2C_NAME_SIZE);
 347                 break;
 348         case 0x22:
 349                 strlcpy(info->type, "emc1422", I2C_NAME_SIZE);
 350                 break;
 351         case 0x23:
 352                 strlcpy(info->type, "emc1423", I2C_NAME_SIZE);
 353                 break;
 354         case 0x25:
 355                 strlcpy(info->type, "emc1404", I2C_NAME_SIZE);
 356                 break;
 357         case 0x27:
 358                 strlcpy(info->type, "emc1424", I2C_NAME_SIZE);
 359                 break;
 360         default:
 361                 return -ENODEV;
 362         }
 363
 364         id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
 365         if (id < 0x01 || id > 0x04)
 366                 return -ENODEV;
 367
 368         return 0;
 369 }
 370
 371 static bool emc1403_regmap_is_volatile(struct device *dev, unsigned int reg)
 372 {
 373         switch (reg) {
 374         case 0x00:      /* internal diode high byte */
 375         case 0x01:      /* external diode 1 high byte */
 376         case 0x02:      /* status */
 377         case 0x10:      /* external diode 1 low byte */
 378         case 0x1b:      /* external diode fault */
 379         case 0x23:      /* external diode 2 high byte */
 380         case 0x24:      /* external diode 2 low byte */
 381         case 0x29:      /* internal diode low byte */
 382         case 0x2a:      /* externl diode 3 high byte */
 383         case 0x2b:      /* external diode 3 low byte */
 384         case 0x35:      /* high limit status */
 385         case 0x36:      /* low limit status */
 386         case 0x37:      /* therm limit status */
 387                 return true;
 388         default:
 389                 return false;
 390         }
 391 }
 392
 393 static const struct regmap_config emc1403_regmap_config = {
 394         .reg_bits = 8,
 395         .val_bits = 8,
 396         .cache_type = REGCACHE_RBTREE,
 397         .volatile_reg = emc1403_regmap_is_volatile,
 398 };
 399
 400 static int emc1403_probe(struct i2c_client *client,
 401                         const struct i2c_device_id *id)
 402 {
 403         struct thermal_data *data;
 404         struct device *hwmon_dev;
 405
 406         data = devm_kzalloc(&client->dev, sizeof(struct thermal_data),
 407                             GFP_KERNEL);
 408         if (data == NULL)
 409                 return -ENOMEM;
 410
 411         data->regmap = devm_regmap_init_i2c(client, &emc1403_regmap_config);
 412         if (IS_ERR(data->regmap))
 413                 return PTR_ERR(data->regmap);
 414
 415         mutex_init(&data->mutex);
 416
 417         switch (id->driver_data) {
 418         case emc1404:
 419                 data->groups[2] = &emc1404_group;
 420                 /* fall through */
 421         case emc1403:
 422                 data->groups[1] = &emc1403_group;
 423                 /* fall through */
 424         case emc1402:
 425                 data->groups[0] = &emc1402_group;
 426         }
 427
 428         if (id->driver_data == emc1402)
 429                 data->groups[1] = &emc1402_alarm_group;
 430
 431         hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
 432                                                            client->name, data,
 433                                                            data->groups);
 434         if (IS_ERR(hwmon_dev))
 435                 return PTR_ERR(hwmon_dev);
 436
 437         dev_info(&client->dev, "%s Thermal chip found\n", id->name);
 438         return 0;
 439 }
 440
 441 static const unsigned short emc1403_address_list[] = {
 442         0x18, 0x1c, 0x29, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
 443 };
 444
 445 /* Last digit of chip name indicates number of channels */
 446 static const struct i2c_device_id emc1403_idtable[] = {
 447         { "emc1402", emc1402 },
 448         { "emc1403", emc1403 },
 449         { "emc1404", emc1404 },
 450         { "emc1412", emc1402 },
 451         { "emc1413", emc1403 },
 452         { "emc1414", emc1404 },
 453         { "emc1422", emc1402 },
 454         { "emc1423", emc1403 },
 455         { "emc1424", emc1404 },
 456         { }
 457 };
 458 MODULE_DEVICE_TABLE(i2c, emc1403_idtable);
 459
 460 static struct i2c_driver sensor_emc1403 = {
 461         .class = I2C_CLASS_HWMON,
 462         .driver = {
 463                 .name = "emc1403",
 464         },
 465         .detect = emc1403_detect,
 466         .probe = emc1403_probe,
 467         .id_table = emc1403_idtable,
 468         .address_list = emc1403_address_list,
 469 };
 470
 471 module_i2c_driver(sensor_emc1403);
 472
 473 MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
 474 MODULE_DESCRIPTION("emc1403 Thermal Driver");
 475 MODULE_LICENSE("GPL v2");