drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c

   1 /*
   2  * drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c
   3  * Copyright (c) 2015 Mellanox Technologies. All rights reserved.
   4  * Copyright (c) 2015 Jiri Pirko <jiri@mellanox.com>
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. Neither the names of the copyright holders nor the names of its
  15  *    contributors may be used to endorse or promote products derived from
  16  *    this software without specific prior written permission.
  17  *
  18  * Alternatively, this software may be distributed under the terms of the
  19  * GNU General Public License ("GPL") version 2 as published by the Free
  20  * Software Foundation.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  23  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <linux/kernel.h>
  36 #include <linux/types.h>
  37 #include <linux/device.h>
  38 #include <linux/sysfs.h>
  39 #include <linux/hwmon.h>
  40 #include <linux/err.h>
  41
  42 #include "core.h"
  43
  44 #define MLXSW_HWMON_TEMP_SENSOR_MAX_COUNT 127
  45 #define MLXSW_HWMON_ATTR_COUNT (MLXSW_HWMON_TEMP_SENSOR_MAX_COUNT * 4 + \
  46                                 MLXSW_MFCR_TACHOS_MAX + MLXSW_MFCR_PWMS_MAX)
  47
  48 struct mlxsw_hwmon_attr {
  49         struct device_attribute dev_attr;
  50         struct mlxsw_hwmon *hwmon;
  51         unsigned int type_index;
  52         char name[32];
  53 };
  54
  55 struct mlxsw_hwmon {
  56         struct mlxsw_core *core;
  57         const struct mlxsw_bus_info *bus_info;
  58         struct device *hwmon_dev;
  59         struct attribute_group group;
  60         const struct attribute_group *groups[2];
  61         struct attribute *attrs[MLXSW_HWMON_ATTR_COUNT + 1];
  62         struct mlxsw_hwmon_attr hwmon_attrs[MLXSW_HWMON_ATTR_COUNT];
  63         unsigned int attrs_count;
  64 };
  65
  66 static ssize_t mlxsw_hwmon_temp_show(struct device *dev,
  67                                      struct device_attribute *attr,
  68                                      char *buf)
  69 {
  70         struct mlxsw_hwmon_attr *mlwsw_hwmon_attr =
  71                         container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
  72         struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon;
  73         char mtmp_pl[MLXSW_REG_MTMP_LEN];
  74         unsigned int temp;
  75         int err;
  76
  77         mlxsw_reg_mtmp_pack(mtmp_pl, mlwsw_hwmon_attr->type_index,
  78                             false, false);
  79         err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mtmp), mtmp_pl);
  80         if (err) {
  81                 dev_err(mlxsw_hwmon->bus_info->dev, "Failed to query temp sensor\n");
  82                 return err;
  83         }
  84         mlxsw_reg_mtmp_unpack(mtmp_pl, &temp, NULL, NULL);
  85         return sprintf(buf, "%u\n", temp);
  86 }
  87
  88 static ssize_t mlxsw_hwmon_temp_max_show(struct device *dev,
  89                                          struct device_attribute *attr,
  90                                          char *buf)
  91 {
  92         struct mlxsw_hwmon_attr *mlwsw_hwmon_attr =
  93                         container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
  94         struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon;
  95         char mtmp_pl[MLXSW_REG_MTMP_LEN];
  96         unsigned int temp_max;
  97         int err;
  98
  99         mlxsw_reg_mtmp_pack(mtmp_pl, mlwsw_hwmon_attr->type_index,
 100                             false, false);
 101         err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mtmp), mtmp_pl);
 102         if (err) {
 103                 dev_err(mlxsw_hwmon->bus_info->dev, "Failed to query temp sensor\n");
 104                 return err;
 105         }
 106         mlxsw_reg_mtmp_unpack(mtmp_pl, NULL, &temp_max, NULL);
 107         return sprintf(buf, "%u\n", temp_max);
 108 }
 109
 110 static ssize_t mlxsw_hwmon_temp_rst_store(struct device *dev,
 111                                           struct device_attribute *attr,
 112                                           const char *buf, size_t len)
 113 {
 114         struct mlxsw_hwmon_attr *mlwsw_hwmon_attr =
 115                         container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
 116         struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon;
 117         char mtmp_pl[MLXSW_REG_MTMP_LEN];
 118         unsigned long val;
 119         int err;
 120
 121         err = kstrtoul(buf, 10, &val);
 122         if (err)
 123                 return err;
 124         if (val != 1)
 125                 return -EINVAL;
 126
 127         mlxsw_reg_mtmp_pack(mtmp_pl, mlwsw_hwmon_attr->type_index, true, true);
 128         err = mlxsw_reg_write(mlxsw_hwmon->core, MLXSW_REG(mtmp), mtmp_pl);
 129         if (err) {
 130                 dev_err(mlxsw_hwmon->bus_info->dev, "Failed to reset temp sensor history\n");
 131                 return err;
 132         }
 133         return len;
 134 }
 135
 136 static ssize_t mlxsw_hwmon_fan_rpm_show(struct device *dev,
 137                                         struct device_attribute *attr,
 138                                         char *buf)
 139 {
 140         struct mlxsw_hwmon_attr *mlwsw_hwmon_attr =
 141                         container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
 142         struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon;
 143         char mfsm_pl[MLXSW_REG_MFSM_LEN];
 144         int err;
 145
 146         mlxsw_reg_mfsm_pack(mfsm_pl, mlwsw_hwmon_attr->type_index);
 147         err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mfsm), mfsm_pl);
 148         if (err) {
 149                 dev_err(mlxsw_hwmon->bus_info->dev, "Failed to query fan\n");
 150                 return err;
 151         }
 152         return sprintf(buf, "%u\n", mlxsw_reg_mfsm_rpm_get(mfsm_pl));
 153 }
 154
 155 static ssize_t mlxsw_hwmon_pwm_show(struct device *dev,
 156                                     struct device_attribute *attr,
 157                                     char *buf)
 158 {
 159         struct mlxsw_hwmon_attr *mlwsw_hwmon_attr =
 160                         container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
 161         struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon;
 162         char mfsc_pl[MLXSW_REG_MFSC_LEN];
 163         int err;
 164
 165         mlxsw_reg_mfsc_pack(mfsc_pl, mlwsw_hwmon_attr->type_index, 0);
 166         err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mfsc), mfsc_pl);
 167         if (err) {
 168                 dev_err(mlxsw_hwmon->bus_info->dev, "Failed to query PWM\n");
 169                 return err;
 170         }
 171         return sprintf(buf, "%u\n",
 172                        mlxsw_reg_mfsc_pwm_duty_cycle_get(mfsc_pl));
 173 }
 174
 175 static ssize_t mlxsw_hwmon_pwm_store(struct device *dev,
 176                                      struct device_attribute *attr,
 177                                      const char *buf, size_t len)
 178 {
 179         struct mlxsw_hwmon_attr *mlwsw_hwmon_attr =
 180                         container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
 181         struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon;
 182         char mfsc_pl[MLXSW_REG_MFSC_LEN];
 183         unsigned long val;
 184         int err;
 185
 186         err = kstrtoul(buf, 10, &val);
 187         if (err)
 188                 return err;
 189         if (val > 255)
 190                 return -EINVAL;
 191
 192         mlxsw_reg_mfsc_pack(mfsc_pl, mlwsw_hwmon_attr->type_index, val);
 193         err = mlxsw_reg_write(mlxsw_hwmon->core, MLXSW_REG(mfsc), mfsc_pl);
 194         if (err) {
 195                 dev_err(mlxsw_hwmon->bus_info->dev, "Failed to write PWM\n");
 196                 return err;
 197         }
 198         return len;
 199 }
 200
 201 enum mlxsw_hwmon_attr_type {
 202         MLXSW_HWMON_ATTR_TYPE_TEMP,
 203         MLXSW_HWMON_ATTR_TYPE_TEMP_MAX,
 204         MLXSW_HWMON_ATTR_TYPE_TEMP_RST,
 205         MLXSW_HWMON_ATTR_TYPE_FAN_RPM,
 206         MLXSW_HWMON_ATTR_TYPE_PWM,
 207 };
 208
 209 static void mlxsw_hwmon_attr_add(struct mlxsw_hwmon *mlxsw_hwmon,
 210                                  enum mlxsw_hwmon_attr_type attr_type,
 211                                  unsigned int type_index, unsigned int num) {
 212         struct mlxsw_hwmon_attr *mlxsw_hwmon_attr;
 213         unsigned int attr_index;
 214
 215         attr_index = mlxsw_hwmon->attrs_count;
 216         mlxsw_hwmon_attr = &mlxsw_hwmon->hwmon_attrs[attr_index];
 217
 218         switch (attr_type) {
 219         case MLXSW_HWMON_ATTR_TYPE_TEMP:
 220                 mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_temp_show;
 221                 mlxsw_hwmon_attr->dev_attr.attr.mode = S_IRUGO;
 222                 snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
 223                          "temp%u_input", num + 1);
 224                 break;
 225         case MLXSW_HWMON_ATTR_TYPE_TEMP_MAX:
 226                 mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_temp_max_show;
 227                 mlxsw_hwmon_attr->dev_attr.attr.mode = S_IRUGO;
 228                 snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
 229                          "temp%u_highest", num + 1);
 230                 break;
 231         case MLXSW_HWMON_ATTR_TYPE_TEMP_RST:
 232                 mlxsw_hwmon_attr->dev_attr.store = mlxsw_hwmon_temp_rst_store;
 233                 mlxsw_hwmon_attr->dev_attr.attr.mode = S_IWUSR;
 234                 snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
 235                          "temp%u_reset_history", num + 1);
 236                 break;
 237         case MLXSW_HWMON_ATTR_TYPE_FAN_RPM:
 238                 mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_fan_rpm_show;
 239                 mlxsw_hwmon_attr->dev_attr.attr.mode = S_IRUGO;
 240                 snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
 241                          "fan%u_input", num + 1);
 242                 break;
 243         case MLXSW_HWMON_ATTR_TYPE_PWM:
 244                 mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_pwm_show;
 245                 mlxsw_hwmon_attr->dev_attr.store = mlxsw_hwmon_pwm_store;
 246                 mlxsw_hwmon_attr->dev_attr.attr.mode = S_IWUSR | S_IRUGO;
 247                 snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
 248                          "pwm%u", num + 1);
 249                 break;
 250         default:
 251                 WARN_ON(1);
 252         }
 253
 254         mlxsw_hwmon_attr->type_index = type_index;
 255         mlxsw_hwmon_attr->hwmon = mlxsw_hwmon;
 256         mlxsw_hwmon_attr->dev_attr.attr.name = mlxsw_hwmon_attr->name;
 257         sysfs_attr_init(&mlxsw_hwmon_attr->dev_attr.attr);
 258
 259         mlxsw_hwmon->attrs[attr_index] = &mlxsw_hwmon_attr->dev_attr.attr;
 260         mlxsw_hwmon->attrs_count++;
 261 }
 262
 263 static int mlxsw_hwmon_temp_init(struct mlxsw_hwmon *mlxsw_hwmon)
 264 {
 265         char mtcap_pl[MLXSW_REG_MTCAP_LEN] = {0};
 266         char mtmp_pl[MLXSW_REG_MTMP_LEN];
 267         u8 sensor_count;
 268         int i;
 269         int err;
 270
 271         err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mtcap), mtcap_pl);
 272         if (err) {
 273                 dev_err(mlxsw_hwmon->bus_info->dev, "Failed to get number of temp sensors\n");
 274                 return err;
 275         }
 276         sensor_count = mlxsw_reg_mtcap_sensor_count_get(mtcap_pl);
 277         for (i = 0; i < sensor_count; i++) {
 278                 mlxsw_reg_mtmp_pack(mtmp_pl, i, true, true);
 279                 err = mlxsw_reg_write(mlxsw_hwmon->core,
 280                                       MLXSW_REG(mtmp), mtmp_pl);
 281                 if (err) {
 282                         dev_err(mlxsw_hwmon->bus_info->dev, "Failed to setup temp sensor number %d\n",
 283                                 i);
 284                         return err;
 285                 }
 286                 mlxsw_hwmon_attr_add(mlxsw_hwmon,
 287                                      MLXSW_HWMON_ATTR_TYPE_TEMP, i, i);
 288                 mlxsw_hwmon_attr_add(mlxsw_hwmon,
 289                                      MLXSW_HWMON_ATTR_TYPE_TEMP_MAX, i, i);
 290                 mlxsw_hwmon_attr_add(mlxsw_hwmon,
 291                                      MLXSW_HWMON_ATTR_TYPE_TEMP_RST, i, i);
 292         }
 293         return 0;
 294 }
 295
 296 static int mlxsw_hwmon_fans_init(struct mlxsw_hwmon *mlxsw_hwmon)
 297 {
 298         char mfcr_pl[MLXSW_REG_MFCR_LEN] = {0};
 299         enum mlxsw_reg_mfcr_pwm_frequency freq;
 300         unsigned int type_index;
 301         unsigned int num;
 302         u16 tacho_active;
 303         u8 pwm_active;
 304         int err;
 305
 306         err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mfcr), mfcr_pl);
 307         if (err) {
 308                 dev_err(mlxsw_hwmon->bus_info->dev, "Failed to get to probe PWMs and Tachometers\n");
 309                 return err;
 310         }
 311         mlxsw_reg_mfcr_unpack(mfcr_pl, &freq, &tacho_active, &pwm_active);
 312         num = 0;
 313         for (type_index = 0; type_index < MLXSW_MFCR_TACHOS_MAX; type_index++) {
 314                 if (tacho_active & BIT(type_index))
 315                         mlxsw_hwmon_attr_add(mlxsw_hwmon,
 316                                              MLXSW_HWMON_ATTR_TYPE_FAN_RPM,
 317                                              type_index, num++);
 318         }
 319         num = 0;
 320         for (type_index = 0; type_index < MLXSW_MFCR_PWMS_MAX; type_index++) {
 321                 if (pwm_active & BIT(type_index))
 322                         mlxsw_hwmon_attr_add(mlxsw_hwmon,
 323                                              MLXSW_HWMON_ATTR_TYPE_PWM,
 324                                              type_index, num++);
 325         }
 326         return 0;
 327 }
 328
 329 int mlxsw_hwmon_init(struct mlxsw_core *mlxsw_core,
 330                      const struct mlxsw_bus_info *mlxsw_bus_info,
 331                      struct mlxsw_hwmon **p_hwmon)
 332 {
 333         struct mlxsw_hwmon *mlxsw_hwmon;
 334         struct device *hwmon_dev;
 335         int err;
 336
 337         mlxsw_hwmon = devm_kzalloc(mlxsw_bus_info->dev, sizeof(*mlxsw_hwmon),
 338                                    GFP_KERNEL);
 339         if (!mlxsw_hwmon)
 340                 return -ENOMEM;
 341         mlxsw_hwmon->core = mlxsw_core;
 342         mlxsw_hwmon->bus_info = mlxsw_bus_info;
 343
 344         err = mlxsw_hwmon_temp_init(mlxsw_hwmon);
 345         if (err)
 346                 goto err_temp_init;
 347
 348         err = mlxsw_hwmon_fans_init(mlxsw_hwmon);
 349         if (err)
 350                 goto err_fans_init;
 351
 352         mlxsw_hwmon->groups[0] = &mlxsw_hwmon->group;
 353         mlxsw_hwmon->group.attrs = mlxsw_hwmon->attrs;
 354
 355         hwmon_dev = devm_hwmon_device_register_with_groups(mlxsw_bus_info->dev,
 356                                                            "mlxsw",
 357                                                            mlxsw_hwmon,
 358                                                            mlxsw_hwmon->groups);
 359         if (IS_ERR(hwmon_dev)) {
 360                 err = PTR_ERR(hwmon_dev);
 361                 goto err_hwmon_register;
 362         }
 363
 364         mlxsw_hwmon->hwmon_dev = hwmon_dev;
 365         *p_hwmon = mlxsw_hwmon;
 366         return 0;
 367
 368 err_hwmon_register:
 369 err_fans_init:
 370 err_temp_init:
 371         return err;
 372 }