drivers/hwmon/emc1403.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * emc1403.c - SMSC Thermal Driver
   4  *
   5  * Copyright (C) 2008 Intel Corp
   6  *
   7  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/slab.h>
  15 #include <linux/i2c.h>
  16 #include <linux/hwmon.h>
  17 #include <linux/hwmon-sysfs.h>
  18 #include <linux/err.h>
  19 #include <linux/sysfs.h>
  20 #include <linux/mutex.h>
  21 #include <linux/regmap.h>
  22
  23 #define THERMAL_PID_REG         0xfd
  24 #define THERMAL_SMSC_ID_REG     0xfe
  25 #define THERMAL_REVISION_REG    0xff
  26
  27 enum emc1403_chip { emc1402, emc1403, emc1404 };
  28
  29 struct thermal_data {
  30         struct regmap *regmap;
  31         struct mutex mutex;
  32         const struct attribute_group *groups[4];
  33 };
  34
  35 static ssize_t temp_show(struct device *dev, struct device_attribute *attr,
  36                          char *buf)
  37 {
  38         struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
  39         struct thermal_data *data = dev_get_drvdata(dev);
  40         unsigned int val;
  41         int retval;
  42
  43         retval = regmap_read(data->regmap, sda->index, &val);
  44         if (retval < 0)
  45                 return retval;
  46         return sprintf(buf, "%d000\n", val);
  47 }
  48
  49 static ssize_t bit_show(struct device *dev, struct device_attribute *attr,
  50                         char *buf)
  51 {
  52         struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
  53         struct thermal_data *data = dev_get_drvdata(dev);
  54         unsigned int val;
  55         int retval;
  56
  57         retval = regmap_read(data->regmap, sda->nr, &val);
  58         if (retval < 0)
  59                 return retval;
  60         return sprintf(buf, "%d\n", !!(val & sda->index));
  61 }
  62
  63 static ssize_t temp_store(struct device *dev, struct device_attribute *attr,
  64                           const char *buf, size_t count)
  65 {
  66         struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
  67         struct thermal_data *data = dev_get_drvdata(dev);
  68         unsigned long val;
  69         int retval;
  70
  71         if (kstrtoul(buf, 10, &val))
  72                 return -EINVAL;
  73         retval = regmap_write(data->regmap, sda->index,
  74                               DIV_ROUND_CLOSEST(val, 1000));
  75         if (retval < 0)
  76                 return retval;
  77         return count;
  78 }
  79
  80 static ssize_t bit_store(struct device *dev, struct device_attribute *attr,
  81                          const char *buf, size_t count)
  82 {
  83         struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
  84         struct thermal_data *data = dev_get_drvdata(dev);
  85         unsigned long val;
  86         int retval;
  87
  88         if (kstrtoul(buf, 10, &val))
  89                 return -EINVAL;
  90
  91         retval = regmap_update_bits(data->regmap, sda->nr, sda->index,
  92                                     val ? sda->index : 0);
  93         if (retval < 0)
  94                 return retval;
  95         return count;
  96 }
  97
  98 static ssize_t show_hyst_common(struct device *dev,
  99                                 struct device_attribute *attr, char *buf,
 100                                 bool is_min)
 101 {
 102         struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
 103         struct thermal_data *data = dev_get_drvdata(dev);
 104         struct regmap *regmap = data->regmap;
 105         unsigned int limit;
 106         unsigned int hyst;
 107         int retval;
 108
 109         retval = regmap_read(regmap, sda->index, &limit);
 110         if (retval < 0)
 111                 return retval;
 112
 113         retval = regmap_read(regmap, 0x21, &hyst);
 114         if (retval < 0)
 115                 return retval;
 116
 117         return sprintf(buf, "%d000\n", is_min ? limit + hyst : limit - hyst);
 118 }
 119
 120 static ssize_t hyst_show(struct device *dev, struct device_attribute *attr,
 121                          char *buf)
 122 {
 123         return show_hyst_common(dev, attr, buf, false);
 124 }
 125
 126 static ssize_t min_hyst_show(struct device *dev,
 127                              struct device_attribute *attr, char *buf)
 128 {
 129         return show_hyst_common(dev, attr, buf, true);
 130 }
 131
 132 static ssize_t hyst_store(struct device *dev, struct device_attribute *attr,
 133                           const char *buf, size_t count)
 134 {
 135         struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
 136         struct thermal_data *data = dev_get_drvdata(dev);
 137         struct regmap *regmap = data->regmap;
 138         unsigned int limit;
 139         int retval;
 140         int hyst;
 141         unsigned long val;
 142
 143         if (kstrtoul(buf, 10, &val))
 144                 return -EINVAL;
 145
 146         mutex_lock(&data->mutex);
 147         retval = regmap_read(regmap, sda->index, &limit);
 148         if (retval < 0)
 149                 goto fail;
 150
 151         hyst = limit * 1000 - val;
 152         hyst = clamp_val(DIV_ROUND_CLOSEST(hyst, 1000), 0, 255);
 153         retval = regmap_write(regmap, 0x21, hyst);
 154         if (retval == 0)
 155                 retval = count;
 156 fail:
 157         mutex_unlock(&data->mutex);
 158         return retval;
 159 }
 160
 161 /*
 162  *      Sensors. We pass the actual i2c register to the methods.
 163  */
 164
 165 static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, 0x06);
 166 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 0x05);
 167 static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, 0x20);
 168 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0x00);
 169 static SENSOR_DEVICE_ATTR_2_RO(temp1_min_alarm, bit, 0x36, 0x01);
 170 static SENSOR_DEVICE_ATTR_2_RO(temp1_max_alarm, bit, 0x35, 0x01);
 171 static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, bit, 0x37, 0x01);
 172 static SENSOR_DEVICE_ATTR_RO(temp1_min_hyst, min_hyst, 0x06);
 173 static SENSOR_DEVICE_ATTR_RO(temp1_max_hyst, hyst, 0x05);
 174 static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, hyst, 0x20);
 175
 176 static SENSOR_DEVICE_ATTR_RW(temp2_min, temp, 0x08);
 177 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, 0x07);
 178 static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp, 0x19);
 179 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 0x01);
 180 static SENSOR_DEVICE_ATTR_2_RO(temp2_fault, bit, 0x1b, 0x02);
 181 static SENSOR_DEVICE_ATTR_2_RO(temp2_min_alarm, bit, 0x36, 0x02);
 182 static SENSOR_DEVICE_ATTR_2_RO(temp2_max_alarm, bit, 0x35, 0x02);
 183 static SENSOR_DEVICE_ATTR_2_RO(temp2_crit_alarm, bit, 0x37, 0x02);
 184 static SENSOR_DEVICE_ATTR_RO(temp2_min_hyst, min_hyst, 0x08);
 185 static SENSOR_DEVICE_ATTR_RO(temp2_max_hyst, hyst, 0x07);
 186 static SENSOR_DEVICE_ATTR_RO(temp2_crit_hyst, hyst, 0x19);
 187
 188 static SENSOR_DEVICE_ATTR_RW(temp3_min, temp, 0x16);
 189 static SENSOR_DEVICE_ATTR_RW(temp3_max, temp, 0x15);
 190 static SENSOR_DEVICE_ATTR_RW(temp3_crit, temp, 0x1A);
 191 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 0x23);
 192 static SENSOR_DEVICE_ATTR_2_RO(temp3_fault, bit, 0x1b, 0x04);
 193 static SENSOR_DEVICE_ATTR_2_RO(temp3_min_alarm, bit, 0x36, 0x04);
 194 static SENSOR_DEVICE_ATTR_2_RO(temp3_max_alarm, bit, 0x35, 0x04);
 195 static SENSOR_DEVICE_ATTR_2_RO(temp3_crit_alarm, bit, 0x37, 0x04);
 196 static SENSOR_DEVICE_ATTR_RO(temp3_min_hyst, min_hyst, 0x16);
 197 static SENSOR_DEVICE_ATTR_RO(temp3_max_hyst, hyst, 0x15);
 198 static SENSOR_DEVICE_ATTR_RO(temp3_crit_hyst, hyst, 0x1A);
 199
 200 static SENSOR_DEVICE_ATTR_RW(temp4_min, temp, 0x2D);
 201 static SENSOR_DEVICE_ATTR_RW(temp4_max, temp, 0x2C);
 202 static SENSOR_DEVICE_ATTR_RW(temp4_crit, temp, 0x30);
 203 static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 0x2A);
 204 static SENSOR_DEVICE_ATTR_2_RO(temp4_fault, bit, 0x1b, 0x08);
 205 static SENSOR_DEVICE_ATTR_2_RO(temp4_min_alarm, bit, 0x36, 0x08);
 206 static SENSOR_DEVICE_ATTR_2_RO(temp4_max_alarm, bit, 0x35, 0x08);
 207 static SENSOR_DEVICE_ATTR_2_RO(temp4_crit_alarm, bit, 0x37, 0x08);
 208 static SENSOR_DEVICE_ATTR_RO(temp4_min_hyst, min_hyst, 0x2D);
 209 static SENSOR_DEVICE_ATTR_RO(temp4_max_hyst, hyst, 0x2C);
 210 static SENSOR_DEVICE_ATTR_RO(temp4_crit_hyst, hyst, 0x30);
 211
 212 static SENSOR_DEVICE_ATTR_2_RW(power_state, bit, 0x03, 0x40);
 213
 214 static struct attribute *emc1402_attrs[] = {
 215         &sensor_dev_attr_temp1_min.dev_attr.attr,
 216         &sensor_dev_attr_temp1_max.dev_attr.attr,
 217         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 218         &sensor_dev_attr_temp1_input.dev_attr.attr,
 219         &sensor_dev_attr_temp1_min_hyst.dev_attr.attr,
 220         &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
 221         &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
 222
 223         &sensor_dev_attr_temp2_min.dev_attr.attr,
 224         &sensor_dev_attr_temp2_max.dev_attr.attr,
 225         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 226         &sensor_dev_attr_temp2_input.dev_attr.attr,
 227         &sensor_dev_attr_temp2_min_hyst.dev_attr.attr,
 228         &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
 229         &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
 230
 231         &sensor_dev_attr_power_state.dev_attr.attr,
 232         NULL
 233 };
 234
 235 static const struct attribute_group emc1402_group = {
 236                 .attrs = emc1402_attrs,
 237 };
 238
 239 static struct attribute *emc1403_attrs[] = {
 240         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 241         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 242         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 243
 244         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 245         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 246         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 247         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 248
 249         &sensor_dev_attr_temp3_min.dev_attr.attr,
 250         &sensor_dev_attr_temp3_max.dev_attr.attr,
 251         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 252         &sensor_dev_attr_temp3_input.dev_attr.attr,
 253         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 254         &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
 255         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 256         &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 257         &sensor_dev_attr_temp3_min_hyst.dev_attr.attr,
 258         &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
 259         &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
 260         NULL
 261 };
 262
 263 static const struct attribute_group emc1403_group = {
 264         .attrs = emc1403_attrs,
 265 };
 266
 267 static struct attribute *emc1404_attrs[] = {
 268         &sensor_dev_attr_temp4_min.dev_attr.attr,
 269         &sensor_dev_attr_temp4_max.dev_attr.attr,
 270         &sensor_dev_attr_temp4_crit.dev_attr.attr,
 271         &sensor_dev_attr_temp4_input.dev_attr.attr,
 272         &sensor_dev_attr_temp4_fault.dev_attr.attr,
 273         &sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
 274         &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 275         &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
 276         &sensor_dev_attr_temp4_min_hyst.dev_attr.attr,
 277         &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
 278         &sensor_dev_attr_temp4_crit_hyst.dev_attr.attr,
 279         NULL
 280 };
 281
 282 static const struct attribute_group emc1404_group = {
 283         .attrs = emc1404_attrs,
 284 };
 285
 286 /*
 287  * EMC14x2 uses a different register and different bits to report alarm and
 288  * fault status. For simplicity, provide a separate attribute group for this
 289  * chip series.
 290  * Since we can not re-use the same attribute names, create a separate attribute
 291  * array.
 292  */
 293 static struct sensor_device_attribute_2 emc1402_alarms[] = {
 294         SENSOR_ATTR_2_RO(temp1_min_alarm, bit, 0x02, 0x20),
 295         SENSOR_ATTR_2_RO(temp1_max_alarm, bit, 0x02, 0x40),
 296         SENSOR_ATTR_2_RO(temp1_crit_alarm, bit, 0x02, 0x01),
 297
 298         SENSOR_ATTR_2_RO(temp2_fault, bit, 0x02, 0x04),
 299         SENSOR_ATTR_2_RO(temp2_min_alarm, bit, 0x02, 0x08),
 300         SENSOR_ATTR_2_RO(temp2_max_alarm, bit, 0x02, 0x10),
 301         SENSOR_ATTR_2_RO(temp2_crit_alarm, bit, 0x02, 0x02),
 302 };
 303
 304 static struct attribute *emc1402_alarm_attrs[] = {
 305         &emc1402_alarms[0].dev_attr.attr,
 306         &emc1402_alarms[1].dev_attr.attr,
 307         &emc1402_alarms[2].dev_attr.attr,
 308         &emc1402_alarms[3].dev_attr.attr,
 309         &emc1402_alarms[4].dev_attr.attr,
 310         &emc1402_alarms[5].dev_attr.attr,
 311         &emc1402_alarms[6].dev_attr.attr,
 312         NULL,
 313 };
 314
 315 static const struct attribute_group emc1402_alarm_group = {
 316         .attrs = emc1402_alarm_attrs,
 317 };
 318
 319 static int emc1403_detect(struct i2c_client *client,
 320                         struct i2c_board_info *info)
 321 {
 322         int id;
 323         /* Check if thermal chip is SMSC and EMC1403 or EMC1423 */
 324
 325         id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
 326         if (id != 0x5d)
 327                 return -ENODEV;
 328
 329         id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
 330         switch (id) {
 331         case 0x20:
 332                 strlcpy(info->type, "emc1402", I2C_NAME_SIZE);
 333                 break;
 334         case 0x21:
 335                 strlcpy(info->type, "emc1403", I2C_NAME_SIZE);
 336                 break;
 337         case 0x22:
 338                 strlcpy(info->type, "emc1422", I2C_NAME_SIZE);
 339                 break;
 340         case 0x23:
 341                 strlcpy(info->type, "emc1423", I2C_NAME_SIZE);
 342                 break;
 343         case 0x25:
 344                 strlcpy(info->type, "emc1404", I2C_NAME_SIZE);
 345                 break;
 346         case 0x27:
 347                 strlcpy(info->type, "emc1424", I2C_NAME_SIZE);
 348                 break;
 349         default:
 350                 return -ENODEV;
 351         }
 352
 353         id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
 354         if (id < 0x01 || id > 0x04)
 355                 return -ENODEV;
 356
 357         return 0;
 358 }
 359
 360 static bool emc1403_regmap_is_volatile(struct device *dev, unsigned int reg)
 361 {
 362         switch (reg) {
 363         case 0x00:      /* internal diode high byte */
 364         case 0x01:      /* external diode 1 high byte */
 365         case 0x02:      /* status */
 366         case 0x10:      /* external diode 1 low byte */
 367         case 0x1b:      /* external diode fault */
 368         case 0x23:      /* external diode 2 high byte */
 369         case 0x24:      /* external diode 2 low byte */
 370         case 0x29:      /* internal diode low byte */
 371         case 0x2a:      /* externl diode 3 high byte */
 372         case 0x2b:      /* external diode 3 low byte */
 373         case 0x35:      /* high limit status */
 374         case 0x36:      /* low limit status */
 375         case 0x37:      /* therm limit status */
 376                 return true;
 377         default:
 378                 return false;
 379         }
 380 }
 381
 382 static const struct regmap_config emc1403_regmap_config = {
 383         .reg_bits = 8,
 384         .val_bits = 8,
 385         .cache_type = REGCACHE_RBTREE,
 386         .volatile_reg = emc1403_regmap_is_volatile,
 387 };
 388
 389 static const struct i2c_device_id emc1403_idtable[];
 390
 391 static int emc1403_probe(struct i2c_client *client)
 392 {
 393         struct thermal_data *data;
 394         struct device *hwmon_dev;
 395         const struct i2c_device_id *id = i2c_match_id(emc1403_idtable, client);
 396
 397         data = devm_kzalloc(&client->dev, sizeof(struct thermal_data),
 398                             GFP_KERNEL);
 399         if (data == NULL)
 400                 return -ENOMEM;
 401
 402         data->regmap = devm_regmap_init_i2c(client, &emc1403_regmap_config);
 403         if (IS_ERR(data->regmap))
 404                 return PTR_ERR(data->regmap);
 405
 406         mutex_init(&data->mutex);
 407
 408         switch (id->driver_data) {
 409         case emc1404:
 410                 data->groups[2] = &emc1404_group;
 411                 fallthrough;
 412         case emc1403:
 413                 data->groups[1] = &emc1403_group;
 414                 fallthrough;
 415         case emc1402:
 416                 data->groups[0] = &emc1402_group;
 417         }
 418
 419         if (id->driver_data == emc1402)
 420                 data->groups[1] = &emc1402_alarm_group;
 421
 422         hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
 423                                                            client->name, data,
 424                                                            data->groups);
 425         if (IS_ERR(hwmon_dev))
 426                 return PTR_ERR(hwmon_dev);
 427
 428         dev_info(&client->dev, "%s Thermal chip found\n", id->name);
 429         return 0;
 430 }
 431
 432 static const unsigned short emc1403_address_list[] = {
 433         0x18, 0x1c, 0x29, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
 434 };
 435
 436 /* Last digit of chip name indicates number of channels */
 437 static const struct i2c_device_id emc1403_idtable[] = {
 438         { "emc1402", emc1402 },
 439         { "emc1403", emc1403 },
 440         { "emc1404", emc1404 },
 441         { "emc1412", emc1402 },
 442         { "emc1413", emc1403 },
 443         { "emc1414", emc1404 },
 444         { "emc1422", emc1402 },
 445         { "emc1423", emc1403 },
 446         { "emc1424", emc1404 },
 447         { }
 448 };
 449 MODULE_DEVICE_TABLE(i2c, emc1403_idtable);
 450
 451 static struct i2c_driver sensor_emc1403 = {
 452         .class = I2C_CLASS_HWMON,
 453         .driver = {
 454                 .name = "emc1403",
 455         },
 456         .detect = emc1403_detect,
 457         .probe_new = emc1403_probe,
 458         .id_table = emc1403_idtable,
 459         .address_list = emc1403_address_list,
 460 };
 461
 462 module_i2c_driver(sensor_emc1403);
 463
 464 MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
 465 MODULE_DESCRIPTION("emc1403 Thermal Driver");
 466 MODULE_LICENSE("GPL v2");