drivers/hwmon/lineage-pem.c

   1 /*
   2  * Driver for Lineage Compact Power Line series of power entry modules.
   3  *
   4  * Copyright (C) 2010, 2011 Ericsson AB.
   5  *
   6  * Documentation:
   7  *  http://www.lineagepower.com/oem/pdf/CPLI2C.pdf
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/err.h>
  28 #include <linux/slab.h>
  29 #include <linux/i2c.h>
  30 #include <linux/hwmon.h>
  31 #include <linux/hwmon-sysfs.h>
  32 #include <linux/jiffies.h>
  33
  34 /*
  35  * This driver supports various Lineage Compact Power Line DC/DC and AC/DC
  36  * converters such as CP1800, CP2000AC, CP2000DC, CP2100DC, and others.
  37  *
  38  * The devices are nominally PMBus compliant. However, most standard PMBus
  39  * commands are not supported. Specifically, all hardware monitoring and
  40  * status reporting commands are non-standard. For this reason, a standard
  41  * PMBus driver can not be used.
  42  *
  43  * All Lineage CPL devices have a built-in I2C bus master selector (PCA9541).
  44  * To ensure device access, this driver should only be used as client driver
  45  * to the pca9541 I2C master selector driver.
  46  */
  47
  48 /* Command codes */
  49 #define PEM_OPERATION           0x01
  50 #define PEM_CLEAR_INFO_FLAGS    0x03
  51 #define PEM_VOUT_COMMAND        0x21
  52 #define PEM_VOUT_OV_FAULT_LIMIT 0x40
  53 #define PEM_READ_DATA_STRING    0xd0
  54 #define PEM_READ_INPUT_STRING   0xdc
  55 #define PEM_READ_FIRMWARE_REV   0xdd
  56 #define PEM_READ_RUN_TIMER      0xde
  57 #define PEM_FAN_HI_SPEED        0xdf
  58 #define PEM_FAN_NORMAL_SPEED    0xe0
  59 #define PEM_READ_FAN_SPEED      0xe1
  60
  61 /* offsets in data string */
  62 #define PEM_DATA_STATUS_2       0
  63 #define PEM_DATA_STATUS_1       1
  64 #define PEM_DATA_ALARM_2        2
  65 #define PEM_DATA_ALARM_1        3
  66 #define PEM_DATA_VOUT_LSB       4
  67 #define PEM_DATA_VOUT_MSB       5
  68 #define PEM_DATA_CURRENT        6
  69 #define PEM_DATA_TEMP           7
  70
  71 /* Virtual entries, to report constants */
  72 #define PEM_DATA_TEMP_MAX       10
  73 #define PEM_DATA_TEMP_CRIT      11
  74
  75 /* offsets in input string */
  76 #define PEM_INPUT_VOLTAGE       0
  77 #define PEM_INPUT_POWER_LSB     1
  78 #define PEM_INPUT_POWER_MSB     2
  79
  80 /* offsets in fan data */
  81 #define PEM_FAN_ADJUSTMENT      0
  82 #define PEM_FAN_FAN1            1
  83 #define PEM_FAN_FAN2            2
  84 #define PEM_FAN_FAN3            3
  85
  86 /* Status register bits */
  87 #define STS1_OUTPUT_ON          (1 << 0)
  88 #define STS1_LEDS_FLASHING      (1 << 1)
  89 #define STS1_EXT_FAULT          (1 << 2)
  90 #define STS1_SERVICE_LED_ON     (1 << 3)
  91 #define STS1_SHUTDOWN_OCCURRED  (1 << 4)
  92 #define STS1_INT_FAULT          (1 << 5)
  93 #define STS1_ISOLATION_TEST_OK  (1 << 6)
  94
  95 #define STS2_ENABLE_PIN_HI      (1 << 0)
  96 #define STS2_DATA_OUT_RANGE     (1 << 1)
  97 #define STS2_RESTARTED_OK       (1 << 1)
  98 #define STS2_ISOLATION_TEST_FAIL (1 << 3)
  99 #define STS2_HIGH_POWER_CAP     (1 << 4)
 100 #define STS2_INVALID_INSTR      (1 << 5)
 101 #define STS2_WILL_RESTART       (1 << 6)
 102 #define STS2_PEC_ERR            (1 << 7)
 103
 104 /* Alarm register bits */
 105 #define ALRM1_VIN_OUT_LIMIT     (1 << 0)
 106 #define ALRM1_VOUT_OUT_LIMIT    (1 << 1)
 107 #define ALRM1_OV_VOLT_SHUTDOWN  (1 << 2)
 108 #define ALRM1_VIN_OVERCURRENT   (1 << 3)
 109 #define ALRM1_TEMP_WARNING      (1 << 4)
 110 #define ALRM1_TEMP_SHUTDOWN     (1 << 5)
 111 #define ALRM1_PRIMARY_FAULT     (1 << 6)
 112 #define ALRM1_POWER_LIMIT       (1 << 7)
 113
 114 #define ALRM2_5V_OUT_LIMIT      (1 << 1)
 115 #define ALRM2_TEMP_FAULT        (1 << 2)
 116 #define ALRM2_OV_LOW            (1 << 3)
 117 #define ALRM2_DCDC_TEMP_HIGH    (1 << 4)
 118 #define ALRM2_PRI_TEMP_HIGH     (1 << 5)
 119 #define ALRM2_NO_PRIMARY        (1 << 6)
 120 #define ALRM2_FAN_FAULT         (1 << 7)
 121
 122 #define FIRMWARE_REV_LEN        4
 123 #define DATA_STRING_LEN         9
 124 #define INPUT_STRING_LEN        5       /* 4 for most devices   */
 125 #define FAN_SPEED_LEN           5
 126
 127 struct pem_data {
 128         struct i2c_client *client;
 129         const struct attribute_group *groups[4];
 130
 131         struct mutex update_lock;
 132         bool valid;
 133         bool fans_supported;
 134         int input_length;
 135         unsigned long last_updated;     /* in jiffies */
 136
 137         u8 firmware_rev[FIRMWARE_REV_LEN];
 138         u8 data_string[DATA_STRING_LEN];
 139         u8 input_string[INPUT_STRING_LEN];
 140         u8 fan_speed[FAN_SPEED_LEN];
 141 };
 142
 143 static int pem_read_block(struct i2c_client *client, u8 command, u8 *data,
 144                           int data_len)
 145 {
 146         u8 block_buffer[I2C_SMBUS_BLOCK_MAX];
 147         int result;
 148
 149         result = i2c_smbus_read_block_data(client, command, block_buffer);
 150         if (unlikely(result < 0))
 151                 goto abort;
 152         if (unlikely(result == 0xff || result != data_len)) {
 153                 result = -EIO;
 154                 goto abort;
 155         }
 156         memcpy(data, block_buffer, data_len);
 157         result = 0;
 158 abort:
 159         return result;
 160 }
 161
 162 static struct pem_data *pem_update_device(struct device *dev)
 163 {
 164         struct pem_data *data = dev_get_drvdata(dev);
 165         struct i2c_client *client = data->client;
 166         struct pem_data *ret = data;
 167
 168         mutex_lock(&data->update_lock);
 169
 170         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 171                 int result;
 172
 173                 /* Read data string */
 174                 result = pem_read_block(client, PEM_READ_DATA_STRING,
 175                                         data->data_string,
 176                                         sizeof(data->data_string));
 177                 if (unlikely(result < 0)) {
 178                         ret = ERR_PTR(result);
 179                         goto abort;
 180                 }
 181
 182                 /* Read input string */
 183                 if (data->input_length) {
 184                         result = pem_read_block(client, PEM_READ_INPUT_STRING,
 185                                                 data->input_string,
 186                                                 data->input_length);
 187                         if (unlikely(result < 0)) {
 188                                 ret = ERR_PTR(result);
 189                                 goto abort;
 190                         }
 191                 }
 192
 193                 /* Read fan speeds */
 194                 if (data->fans_supported) {
 195                         result = pem_read_block(client, PEM_READ_FAN_SPEED,
 196                                                 data->fan_speed,
 197                                                 sizeof(data->fan_speed));
 198                         if (unlikely(result < 0)) {
 199                                 ret = ERR_PTR(result);
 200                                 goto abort;
 201                         }
 202                 }
 203
 204                 i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS);
 205
 206                 data->last_updated = jiffies;
 207                 data->valid = 1;
 208         }
 209 abort:
 210         mutex_unlock(&data->update_lock);
 211         return ret;
 212 }
 213
 214 static long pem_get_data(u8 *data, int len, int index)
 215 {
 216         long val;
 217
 218         switch (index) {
 219         case PEM_DATA_VOUT_LSB:
 220                 val = (data[index] + (data[index+1] << 8)) * 5 / 2;
 221                 break;
 222         case PEM_DATA_CURRENT:
 223                 val = data[index] * 200;
 224                 break;
 225         case PEM_DATA_TEMP:
 226                 val = data[index] * 1000;
 227                 break;
 228         case PEM_DATA_TEMP_MAX:
 229                 val = 97 * 1000;        /* 97 degrees C per datasheet */
 230                 break;
 231         case PEM_DATA_TEMP_CRIT:
 232                 val = 107 * 1000;       /* 107 degrees C per datasheet */
 233                 break;
 234         default:
 235                 WARN_ON_ONCE(1);
 236                 val = 0;
 237         }
 238         return val;
 239 }
 240
 241 static long pem_get_input(u8 *data, int len, int index)
 242 {
 243         long val;
 244
 245         switch (index) {
 246         case PEM_INPUT_VOLTAGE:
 247                 if (len == INPUT_STRING_LEN)
 248                         val = (data[index] + (data[index+1] << 8) - 75) * 1000;
 249                 else
 250                         val = (data[index] - 75) * 1000;
 251                 break;
 252         case PEM_INPUT_POWER_LSB:
 253                 if (len == INPUT_STRING_LEN)
 254                         index++;
 255                 val = (data[index] + (data[index+1] << 8)) * 1000000L;
 256                 break;
 257         default:
 258                 WARN_ON_ONCE(1);
 259                 val = 0;
 260         }
 261         return val;
 262 }
 263
 264 static long pem_get_fan(u8 *data, int len, int index)
 265 {
 266         long val;
 267
 268         switch (index) {
 269         case PEM_FAN_FAN1:
 270         case PEM_FAN_FAN2:
 271         case PEM_FAN_FAN3:
 272                 val = data[index] * 100;
 273                 break;
 274         default:
 275                 WARN_ON_ONCE(1);
 276                 val = 0;
 277         }
 278         return val;
 279 }
 280
 281 /*
 282  * Show boolean, either a fault or an alarm.
 283  * .nr points to the register, .index is the bit mask to check
 284  */
 285 static ssize_t pem_show_bool(struct device *dev,
 286                              struct device_attribute *da, char *buf)
 287 {
 288         struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da);
 289         struct pem_data *data = pem_update_device(dev);
 290         u8 status;
 291
 292         if (IS_ERR(data))
 293                 return PTR_ERR(data);
 294
 295         status = data->data_string[attr->nr] & attr->index;
 296         return snprintf(buf, PAGE_SIZE, "%d\n", !!status);
 297 }
 298
 299 static ssize_t pem_show_data(struct device *dev, struct device_attribute *da,
 300                              char *buf)
 301 {
 302         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 303         struct pem_data *data = pem_update_device(dev);
 304         long value;
 305
 306         if (IS_ERR(data))
 307                 return PTR_ERR(data);
 308
 309         value = pem_get_data(data->data_string, sizeof(data->data_string),
 310                              attr->index);
 311
 312         return snprintf(buf, PAGE_SIZE, "%ld\n", value);
 313 }
 314
 315 static ssize_t pem_show_input(struct device *dev, struct device_attribute *da,
 316                               char *buf)
 317 {
 318         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 319         struct pem_data *data = pem_update_device(dev);
 320         long value;
 321
 322         if (IS_ERR(data))
 323                 return PTR_ERR(data);
 324
 325         value = pem_get_input(data->input_string, sizeof(data->input_string),
 326                               attr->index);
 327
 328         return snprintf(buf, PAGE_SIZE, "%ld\n", value);
 329 }
 330
 331 static ssize_t pem_show_fan(struct device *dev, struct device_attribute *da,
 332                             char *buf)
 333 {
 334         struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 335         struct pem_data *data = pem_update_device(dev);
 336         long value;
 337
 338         if (IS_ERR(data))
 339                 return PTR_ERR(data);
 340
 341         value = pem_get_fan(data->fan_speed, sizeof(data->fan_speed),
 342                             attr->index);
 343
 344         return snprintf(buf, PAGE_SIZE, "%ld\n", value);
 345 }
 346
 347 /* Voltages */
 348 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, pem_show_data, NULL,
 349                           PEM_DATA_VOUT_LSB);
 350 static SENSOR_DEVICE_ATTR_2(in1_alarm, S_IRUGO, pem_show_bool, NULL,
 351                             PEM_DATA_ALARM_1, ALRM1_VOUT_OUT_LIMIT);
 352 static SENSOR_DEVICE_ATTR_2(in1_crit_alarm, S_IRUGO, pem_show_bool, NULL,
 353                             PEM_DATA_ALARM_1, ALRM1_OV_VOLT_SHUTDOWN);
 354 static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, pem_show_input, NULL,
 355                           PEM_INPUT_VOLTAGE);
 356 static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, pem_show_bool, NULL,
 357                             PEM_DATA_ALARM_1,
 358                             ALRM1_VIN_OUT_LIMIT | ALRM1_PRIMARY_FAULT);
 359
 360 /* Currents */
 361 static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, pem_show_data, NULL,
 362                           PEM_DATA_CURRENT);
 363 static SENSOR_DEVICE_ATTR_2(curr1_alarm, S_IRUGO, pem_show_bool, NULL,
 364                             PEM_DATA_ALARM_1, ALRM1_VIN_OVERCURRENT);
 365
 366 /* Power */
 367 static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, pem_show_input, NULL,
 368                           PEM_INPUT_POWER_LSB);
 369 static SENSOR_DEVICE_ATTR_2(power1_alarm, S_IRUGO, pem_show_bool, NULL,
 370                             PEM_DATA_ALARM_1, ALRM1_POWER_LIMIT);
 371
 372 /* Fans */
 373 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, pem_show_fan, NULL,
 374                           PEM_FAN_FAN1);
 375 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, pem_show_fan, NULL,
 376                           PEM_FAN_FAN2);
 377 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, pem_show_fan, NULL,
 378                           PEM_FAN_FAN3);
 379 static SENSOR_DEVICE_ATTR_2(fan1_alarm, S_IRUGO, pem_show_bool, NULL,
 380                             PEM_DATA_ALARM_2, ALRM2_FAN_FAULT);
 381
 382 /* Temperatures */
 383 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, pem_show_data, NULL,
 384                           PEM_DATA_TEMP);
 385 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, pem_show_data, NULL,
 386                           PEM_DATA_TEMP_MAX);
 387 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, pem_show_data, NULL,
 388                           PEM_DATA_TEMP_CRIT);
 389 static SENSOR_DEVICE_ATTR_2(temp1_alarm, S_IRUGO, pem_show_bool, NULL,
 390                             PEM_DATA_ALARM_1, ALRM1_TEMP_WARNING);
 391 static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, pem_show_bool, NULL,
 392                             PEM_DATA_ALARM_1, ALRM1_TEMP_SHUTDOWN);
 393 static SENSOR_DEVICE_ATTR_2(temp1_fault, S_IRUGO, pem_show_bool, NULL,
 394                             PEM_DATA_ALARM_2, ALRM2_TEMP_FAULT);
 395
 396 static struct attribute *pem_attributes[] = {
 397         &sensor_dev_attr_in1_input.dev_attr.attr,
 398         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 399         &sensor_dev_attr_in1_crit_alarm.dev_attr.attr,
 400         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 401
 402         &sensor_dev_attr_curr1_alarm.dev_attr.attr,
 403
 404         &sensor_dev_attr_power1_alarm.dev_attr.attr,
 405
 406         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 407
 408         &sensor_dev_attr_temp1_input.dev_attr.attr,
 409         &sensor_dev_attr_temp1_max.dev_attr.attr,
 410         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 411         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 412         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 413         &sensor_dev_attr_temp1_fault.dev_attr.attr,
 414
 415         NULL,
 416 };
 417
 418 static const struct attribute_group pem_group = {
 419         .attrs = pem_attributes,
 420 };
 421
 422 static struct attribute *pem_input_attributes[] = {
 423         &sensor_dev_attr_in2_input.dev_attr.attr,
 424         &sensor_dev_attr_curr1_input.dev_attr.attr,
 425         &sensor_dev_attr_power1_input.dev_attr.attr,
 426         NULL
 427 };
 428
 429 static const struct attribute_group pem_input_group = {
 430         .attrs = pem_input_attributes,
 431 };
 432
 433 static struct attribute *pem_fan_attributes[] = {
 434         &sensor_dev_attr_fan1_input.dev_attr.attr,
 435         &sensor_dev_attr_fan2_input.dev_attr.attr,
 436         &sensor_dev_attr_fan3_input.dev_attr.attr,
 437         NULL
 438 };
 439
 440 static const struct attribute_group pem_fan_group = {
 441         .attrs = pem_fan_attributes,
 442 };
 443
 444 static int pem_probe(struct i2c_client *client,
 445                      const struct i2c_device_id *id)
 446 {
 447         struct i2c_adapter *adapter = client->adapter;
 448         struct device *dev = &client->dev;
 449         struct device *hwmon_dev;
 450         struct pem_data *data;
 451         int ret, idx = 0;
 452
 453         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BLOCK_DATA
 454                                      | I2C_FUNC_SMBUS_WRITE_BYTE))
 455                 return -ENODEV;
 456
 457         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 458         if (!data)
 459                 return -ENOMEM;
 460
 461         data->client = client;
 462         mutex_init(&data->update_lock);
 463
 464         /*
 465          * We use the next two commands to determine if the device is really
 466          * there.
 467          */
 468         ret = pem_read_block(client, PEM_READ_FIRMWARE_REV,
 469                              data->firmware_rev, sizeof(data->firmware_rev));
 470         if (ret < 0)
 471                 return ret;
 472
 473         ret = i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS);
 474         if (ret < 0)
 475                 return ret;
 476
 477         dev_info(dev, "Firmware revision %d.%d.%d\n",
 478                  data->firmware_rev[0], data->firmware_rev[1],
 479                  data->firmware_rev[2]);
 480
 481         /* sysfs hooks */
 482         data->groups[idx++] = &pem_group;
 483
 484         /*
 485          * Check if input readings are supported.
 486          * This is the case if we can read input data,
 487          * and if the returned data is not all zeros.
 488          * Note that input alarms are always supported.
 489          */
 490         ret = pem_read_block(client, PEM_READ_INPUT_STRING,
 491                              data->input_string,
 492                              sizeof(data->input_string) - 1);
 493         if (!ret && (data->input_string[0] || data->input_string[1] ||
 494                      data->input_string[2]))
 495                 data->input_length = sizeof(data->input_string) - 1;
 496         else if (ret < 0) {
 497                 /* Input string is one byte longer for some devices */
 498                 ret = pem_read_block(client, PEM_READ_INPUT_STRING,
 499                                     data->input_string,
 500                                     sizeof(data->input_string));
 501                 if (!ret && (data->input_string[0] || data->input_string[1] ||
 502                             data->input_string[2] || data->input_string[3]))
 503                         data->input_length = sizeof(data->input_string);
 504         }
 505
 506         if (data->input_length)
 507                 data->groups[idx++] = &pem_input_group;
 508
 509         /*
 510          * Check if fan speed readings are supported.
 511          * This is the case if we can read fan speed data,
 512          * and if the returned data is not all zeros.
 513          * Note that the fan alarm is always supported.
 514          */
 515         ret = pem_read_block(client, PEM_READ_FAN_SPEED,
 516                              data->fan_speed,
 517                              sizeof(data->fan_speed));
 518         if (!ret && (data->fan_speed[0] || data->fan_speed[1] ||
 519                      data->fan_speed[2] || data->fan_speed[3])) {
 520                 data->fans_supported = true;
 521                 data->groups[idx++] = &pem_fan_group;
 522         }
 523
 524         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 525                                                            data, data->groups);
 526         return PTR_ERR_OR_ZERO(hwmon_dev);
 527 }
 528
 529 static const struct i2c_device_id pem_id[] = {
 530         {"lineage_pem", 0},
 531         {}
 532 };
 533 MODULE_DEVICE_TABLE(i2c, pem_id);
 534
 535 static struct i2c_driver pem_driver = {
 536         .driver = {
 537                    .name = "lineage_pem",
 538                    },
 539         .probe = pem_probe,
 540         .id_table = pem_id,
 541 };
 542
 543 module_i2c_driver(pem_driver);
 544
 545 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 546 MODULE_DESCRIPTION("Lineage CPL PEM hardware monitoring driver");
 547 MODULE_LICENSE("GPL");