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[16];
  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_fan_rpm_show(struct device *dev,
 111                                         struct device_attribute *attr,
 112                                         char *buf)
 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 mfsm_pl[MLXSW_REG_MFSM_LEN];
 118         int err;
 119
 120         mlxsw_reg_mfsm_pack(mfsm_pl, mlwsw_hwmon_attr->type_index);
 121         err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mfsm), mfsm_pl);
 122         if (err) {
 123                 dev_err(mlxsw_hwmon->bus_info->dev, "Failed to query fan\n");
 124                 return err;
 125         }
 126         return sprintf(buf, "%u\n", mlxsw_reg_mfsm_rpm_get(mfsm_pl));
 127 }
 128
 129 static ssize_t mlxsw_hwmon_pwm_show(struct device *dev,
 130                                     struct device_attribute *attr,
 131                                     char *buf)
 132 {
 133         struct mlxsw_hwmon_attr *mlwsw_hwmon_attr =
 134                         container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
 135         struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon;
 136         char mfsc_pl[MLXSW_REG_MFSC_LEN];
 137         int err;
 138
 139         mlxsw_reg_mfsc_pack(mfsc_pl, mlwsw_hwmon_attr->type_index, 0);
 140         err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mfsc), mfsc_pl);
 141         if (err) {
 142                 dev_err(mlxsw_hwmon->bus_info->dev, "Failed to query PWM\n");
 143                 return err;
 144         }
 145         return sprintf(buf, "%u\n",
 146                        mlxsw_reg_mfsc_pwm_duty_cycle_get(mfsc_pl));
 147 }
 148
 149 static ssize_t mlxsw_hwmon_pwm_store(struct device *dev,
 150                                      struct device_attribute *attr,
 151                                      const char *buf, size_t len)
 152 {
 153         struct mlxsw_hwmon_attr *mlwsw_hwmon_attr =
 154                         container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
 155         struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon;
 156         char mfsc_pl[MLXSW_REG_MFSC_LEN];
 157         unsigned long val;
 158         int err;
 159
 160         err = kstrtoul(buf, 10, &val);
 161         if (err)
 162                 return err;
 163         if (val > 255)
 164                 return -EINVAL;
 165
 166         mlxsw_reg_mfsc_pack(mfsc_pl, mlwsw_hwmon_attr->type_index, val);
 167         err = mlxsw_reg_write(mlxsw_hwmon->core, MLXSW_REG(mfsc), mfsc_pl);
 168         if (err) {
 169                 dev_err(mlxsw_hwmon->bus_info->dev, "Failed to write PWM\n");
 170                 return err;
 171         }
 172         return err ? err : len;
 173 }
 174
 175 enum mlxsw_hwmon_attr_type {
 176         MLXSW_HWMON_ATTR_TYPE_TEMP,
 177         MLXSW_HWMON_ATTR_TYPE_TEMP_MAX,
 178         MLXSW_HWMON_ATTR_TYPE_FAN_RPM,
 179         MLXSW_HWMON_ATTR_TYPE_PWM,
 180 };
 181
 182 static void mlxsw_hwmon_attr_add(struct mlxsw_hwmon *mlxsw_hwmon,
 183                                  enum mlxsw_hwmon_attr_type attr_type,
 184                                  unsigned int type_index, unsigned int num) {
 185         struct mlxsw_hwmon_attr *mlxsw_hwmon_attr;
 186         unsigned int attr_index;
 187
 188         attr_index = mlxsw_hwmon->attrs_count;
 189         mlxsw_hwmon_attr = &mlxsw_hwmon->hwmon_attrs[attr_index];
 190
 191         switch (attr_type) {
 192         case MLXSW_HWMON_ATTR_TYPE_TEMP:
 193                 mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_temp_show;
 194                 mlxsw_hwmon_attr->dev_attr.attr.mode = S_IRUGO;
 195                 snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
 196                          "temp%u_input", num + 1);
 197                 break;
 198         case MLXSW_HWMON_ATTR_TYPE_TEMP_MAX:
 199                 mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_temp_max_show;
 200                 mlxsw_hwmon_attr->dev_attr.attr.mode = S_IRUGO;
 201                 snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
 202                          "temp%u_highest", num + 1);
 203                 break;
 204         case MLXSW_HWMON_ATTR_TYPE_FAN_RPM:
 205                 mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_fan_rpm_show;
 206                 mlxsw_hwmon_attr->dev_attr.attr.mode = S_IRUGO;
 207                 snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
 208                          "fan%u_input", num + 1);
 209                 break;
 210         case MLXSW_HWMON_ATTR_TYPE_PWM:
 211                 mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_pwm_show;
 212                 mlxsw_hwmon_attr->dev_attr.store = mlxsw_hwmon_pwm_store;
 213                 mlxsw_hwmon_attr->dev_attr.attr.mode = S_IWUSR | S_IRUGO;
 214                 snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
 215                          "pwm%u", num + 1);
 216                 break;
 217         default:
 218                 WARN_ON(1);
 219         }
 220
 221         mlxsw_hwmon_attr->type_index = type_index;
 222         mlxsw_hwmon_attr->hwmon = mlxsw_hwmon;
 223         mlxsw_hwmon_attr->dev_attr.attr.name = mlxsw_hwmon_attr->name;
 224         sysfs_attr_init(&mlxsw_hwmon_attr->dev_attr.attr);
 225
 226         mlxsw_hwmon->attrs[attr_index] = &mlxsw_hwmon_attr->dev_attr.attr;
 227         mlxsw_hwmon->attrs_count++;
 228 }
 229
 230 static int mlxsw_hwmon_temp_init(struct mlxsw_hwmon *mlxsw_hwmon)
 231 {
 232         char mtcap_pl[MLXSW_REG_MTCAP_LEN];
 233         char mtmp_pl[MLXSW_REG_MTMP_LEN];
 234         u8 sensor_count;
 235         int i;
 236         int err;
 237
 238         err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mtcap), mtcap_pl);
 239         if (err) {
 240                 dev_err(mlxsw_hwmon->bus_info->dev, "Failed to get number of temp sensors\n");
 241                 return err;
 242         }
 243         sensor_count = mlxsw_reg_mtcap_sensor_count_get(mtcap_pl);
 244         for (i = 0; i < sensor_count; i++) {
 245                 mlxsw_reg_mtmp_pack(mtmp_pl, 0, true, true);
 246                 err = mlxsw_reg_write(mlxsw_hwmon->core,
 247                                       MLXSW_REG(mtmp), mtmp_pl);
 248                 if (err) {
 249                         dev_err(mlxsw_hwmon->bus_info->dev, "Failed to setup temp sensor number %d\n",
 250                                 i);
 251                         return err;
 252                 }
 253                 mlxsw_hwmon_attr_add(mlxsw_hwmon,
 254                                      MLXSW_HWMON_ATTR_TYPE_TEMP, i, i);
 255                 mlxsw_hwmon_attr_add(mlxsw_hwmon,
 256                                      MLXSW_HWMON_ATTR_TYPE_TEMP_MAX, i, i);
 257         }
 258         return 0;
 259 }
 260
 261 static int mlxsw_hwmon_fans_init(struct mlxsw_hwmon *mlxsw_hwmon)
 262 {
 263         char mfcr_pl[MLXSW_REG_MFCR_LEN];
 264         enum mlxsw_reg_mfcr_pwm_frequency freq;
 265         unsigned int type_index;
 266         unsigned int num;
 267         u16 tacho_active;
 268         u8 pwm_active;
 269         int err;
 270
 271         err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mfcr), mfcr_pl);
 272         if (err) {
 273                 dev_err(mlxsw_hwmon->bus_info->dev, "Failed to get to probe PWMs and Tachometers\n");
 274                 return err;
 275         }
 276         mlxsw_reg_mfcr_unpack(mfcr_pl, &freq, &tacho_active, &pwm_active);
 277         num = 0;
 278         for (type_index = 0; type_index < MLXSW_MFCR_TACHOS_MAX; type_index++) {
 279                 if (tacho_active & BIT(type_index))
 280                         mlxsw_hwmon_attr_add(mlxsw_hwmon,
 281                                              MLXSW_HWMON_ATTR_TYPE_FAN_RPM,
 282                                              type_index, num++);
 283         }
 284         num = 0;
 285         for (type_index = 0; type_index < MLXSW_MFCR_PWMS_MAX; type_index++) {
 286                 if (pwm_active & BIT(type_index))
 287                         mlxsw_hwmon_attr_add(mlxsw_hwmon,
 288                                              MLXSW_HWMON_ATTR_TYPE_PWM,
 289                                              type_index, num++);
 290         }
 291         return 0;
 292 }
 293
 294 int mlxsw_hwmon_init(struct mlxsw_core *mlxsw_core,
 295                      const struct mlxsw_bus_info *mlxsw_bus_info,
 296                      struct mlxsw_hwmon **p_hwmon)
 297 {
 298         struct mlxsw_hwmon *mlxsw_hwmon;
 299         struct device *hwmon_dev;
 300         int err;
 301
 302         mlxsw_hwmon = kzalloc(sizeof(*mlxsw_hwmon), GFP_KERNEL);
 303         if (!mlxsw_hwmon)
 304                 return -ENOMEM;
 305         mlxsw_hwmon->core = mlxsw_core;
 306         mlxsw_hwmon->bus_info = mlxsw_bus_info;
 307
 308         err = mlxsw_hwmon_temp_init(mlxsw_hwmon);
 309         if (err)
 310                 goto err_temp_init;
 311
 312         err = mlxsw_hwmon_fans_init(mlxsw_hwmon);
 313         if (err)
 314                 goto err_fans_init;
 315
 316         mlxsw_hwmon->groups[0] = &mlxsw_hwmon->group;
 317         mlxsw_hwmon->group.attrs = mlxsw_hwmon->attrs;
 318
 319         hwmon_dev = devm_hwmon_device_register_with_groups(mlxsw_bus_info->dev,
 320                                                            "mlxsw",
 321                                                            mlxsw_hwmon,
 322                                                            mlxsw_hwmon->groups);
 323         if (IS_ERR(hwmon_dev)) {
 324                 err = PTR_ERR(hwmon_dev);
 325                 goto err_hwmon_register;
 326         }
 327
 328         mlxsw_hwmon->hwmon_dev = hwmon_dev;
 329         *p_hwmon = mlxsw_hwmon;
 330         return 0;
 331
 332 err_hwmon_register:
 333 err_fans_init:
 334 err_temp_init:
 335         kfree(mlxsw_hwmon);
 336         return err;
 337 }
 338
 339 void mlxsw_hwmon_fini(struct mlxsw_hwmon *mlxsw_hwmon)
 340 {
 341         kfree(mlxsw_hwmon);
 342 }