drivers/hwmon/occ/sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 // Copyright IBM Corp 2019
   3
   4 #include <linux/bitops.h>
   5 #include <linux/device.h>
   6 #include <linux/export.h>
   7 #include <linux/hwmon-sysfs.h>
   8 #include <linux/kernel.h>
   9 #include <linux/sysfs.h>
  10
  11 #include "common.h"
  12
  13 /* OCC status register */
  14 #define OCC_STAT_MASTER                 BIT(7)
  15 #define OCC_STAT_ACTIVE                 BIT(0)
  16
  17 /* OCC extended status register */
  18 #define OCC_EXT_STAT_DVFS_OT            BIT(7)
  19 #define OCC_EXT_STAT_DVFS_POWER         BIT(6)
  20 #define OCC_EXT_STAT_MEM_THROTTLE       BIT(5)
  21 #define OCC_EXT_STAT_QUICK_DROP         BIT(4)
  22
  23 static ssize_t occ_sysfs_show(struct device *dev,
  24                               struct device_attribute *attr, char *buf)
  25 {
  26         int rc;
  27         int val = 0;
  28         struct occ *occ = dev_get_drvdata(dev);
  29         struct occ_poll_response_header *header;
  30         struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
  31
  32         rc = occ_update_response(occ);
  33         if (rc)
  34                 return rc;
  35
  36         header = (struct occ_poll_response_header *)occ->resp.data;
  37
  38         switch (sattr->index) {
  39         case 0:
  40                 val = !!(header->status & OCC_STAT_MASTER);
  41                 break;
  42         case 1:
  43                 val = !!(header->status & OCC_STAT_ACTIVE);
  44                 break;
  45         case 2:
  46                 val = !!(header->ext_status & OCC_EXT_STAT_DVFS_OT);
  47                 break;
  48         case 3:
  49                 val = !!(header->ext_status & OCC_EXT_STAT_DVFS_POWER);
  50                 break;
  51         case 4:
  52                 val = !!(header->ext_status & OCC_EXT_STAT_MEM_THROTTLE);
  53                 break;
  54         case 5:
  55                 val = !!(header->ext_status & OCC_EXT_STAT_QUICK_DROP);
  56                 break;
  57         case 6:
  58                 val = header->occ_state;
  59                 break;
  60         case 7:
  61                 if (header->status & OCC_STAT_MASTER)
  62                         val = hweight8(header->occs_present);
  63                 else
  64                         val = 1;
  65                 break;
  66         default:
  67                 return -EINVAL;
  68         }
  69
  70         return snprintf(buf, PAGE_SIZE - 1, "%d\n", val);
  71 }
  72
  73 static ssize_t occ_error_show(struct device *dev,
  74                               struct device_attribute *attr, char *buf)
  75 {
  76         struct occ *occ = dev_get_drvdata(dev);
  77
  78         occ_update_response(occ);
  79
  80         return snprintf(buf, PAGE_SIZE - 1, "%d\n", occ->error);
  81 }
  82
  83 static SENSOR_DEVICE_ATTR(occ_master, 0444, occ_sysfs_show, NULL, 0);
  84 static SENSOR_DEVICE_ATTR(occ_active, 0444, occ_sysfs_show, NULL, 1);
  85 static SENSOR_DEVICE_ATTR(occ_dvfs_overtemp, 0444, occ_sysfs_show, NULL, 2);
  86 static SENSOR_DEVICE_ATTR(occ_dvfs_power, 0444, occ_sysfs_show, NULL, 3);
  87 static SENSOR_DEVICE_ATTR(occ_mem_throttle, 0444, occ_sysfs_show, NULL, 4);
  88 static SENSOR_DEVICE_ATTR(occ_quick_pwr_drop, 0444, occ_sysfs_show, NULL, 5);
  89 static SENSOR_DEVICE_ATTR(occ_state, 0444, occ_sysfs_show, NULL, 6);
  90 static SENSOR_DEVICE_ATTR(occs_present, 0444, occ_sysfs_show, NULL, 7);
  91 static DEVICE_ATTR_RO(occ_error);
  92
  93 static struct attribute *occ_attributes[] = {
  94         &sensor_dev_attr_occ_master.dev_attr.attr,
  95         &sensor_dev_attr_occ_active.dev_attr.attr,
  96         &sensor_dev_attr_occ_dvfs_overtemp.dev_attr.attr,
  97         &sensor_dev_attr_occ_dvfs_power.dev_attr.attr,
  98         &sensor_dev_attr_occ_mem_throttle.dev_attr.attr,
  99         &sensor_dev_attr_occ_quick_pwr_drop.dev_attr.attr,
 100         &sensor_dev_attr_occ_state.dev_attr.attr,
 101         &sensor_dev_attr_occs_present.dev_attr.attr,
 102         &dev_attr_occ_error.attr,
 103         NULL
 104 };
 105
 106 static const struct attribute_group occ_sysfs = {
 107         .attrs = occ_attributes,
 108 };
 109
 110 void occ_sysfs_poll_done(struct occ *occ)
 111 {
 112         const char *name;
 113         struct occ_poll_response_header *header =
 114                 (struct occ_poll_response_header *)occ->resp.data;
 115
 116         /*
 117          * On the first poll response, we haven't yet created the sysfs
 118          * attributes, so don't make any notify calls.
 119          */
 120         if (!occ->hwmon)
 121                 goto done;
 122
 123         if ((header->status & OCC_STAT_MASTER) !=
 124             (occ->prev_stat & OCC_STAT_MASTER)) {
 125                 name = sensor_dev_attr_occ_master.dev_attr.attr.name;
 126                 sysfs_notify(&occ->bus_dev->kobj, NULL, name);
 127         }
 128
 129         if ((header->status & OCC_STAT_ACTIVE) !=
 130             (occ->prev_stat & OCC_STAT_ACTIVE)) {
 131                 name = sensor_dev_attr_occ_active.dev_attr.attr.name;
 132                 sysfs_notify(&occ->bus_dev->kobj, NULL, name);
 133         }
 134
 135         if ((header->ext_status & OCC_EXT_STAT_DVFS_OT) !=
 136             (occ->prev_ext_stat & OCC_EXT_STAT_DVFS_OT)) {
 137                 name = sensor_dev_attr_occ_dvfs_overtemp.dev_attr.attr.name;
 138                 sysfs_notify(&occ->bus_dev->kobj, NULL, name);
 139         }
 140
 141         if ((header->ext_status & OCC_EXT_STAT_DVFS_POWER) !=
 142             (occ->prev_ext_stat & OCC_EXT_STAT_DVFS_POWER)) {
 143                 name = sensor_dev_attr_occ_dvfs_power.dev_attr.attr.name;
 144                 sysfs_notify(&occ->bus_dev->kobj, NULL, name);
 145         }
 146
 147         if ((header->ext_status & OCC_EXT_STAT_MEM_THROTTLE) !=
 148             (occ->prev_ext_stat & OCC_EXT_STAT_MEM_THROTTLE)) {
 149                 name = sensor_dev_attr_occ_mem_throttle.dev_attr.attr.name;
 150                 sysfs_notify(&occ->bus_dev->kobj, NULL, name);
 151         }
 152
 153         if ((header->ext_status & OCC_EXT_STAT_QUICK_DROP) !=
 154             (occ->prev_ext_stat & OCC_EXT_STAT_QUICK_DROP)) {
 155                 name = sensor_dev_attr_occ_quick_pwr_drop.dev_attr.attr.name;
 156                 sysfs_notify(&occ->bus_dev->kobj, NULL, name);
 157         }
 158
 159         if ((header->status & OCC_STAT_MASTER) &&
 160             header->occs_present != occ->prev_occs_present) {
 161                 name = sensor_dev_attr_occs_present.dev_attr.attr.name;
 162                 sysfs_notify(&occ->bus_dev->kobj, NULL, name);
 163         }
 164
 165         if (occ->error && occ->error != occ->prev_error) {
 166                 name = dev_attr_occ_error.attr.name;
 167                 sysfs_notify(&occ->bus_dev->kobj, NULL, name);
 168         }
 169
 170         /* no notifications for OCC state; doesn't indicate error condition */
 171
 172 done:
 173         occ->prev_error = occ->error;
 174         occ->prev_stat = header->status;
 175         occ->prev_ext_stat = header->ext_status;
 176         occ->prev_occs_present = header->occs_present;
 177 }
 178
 179 int occ_setup_sysfs(struct occ *occ)
 180 {
 181         return sysfs_create_group(&occ->bus_dev->kobj, &occ_sysfs);
 182 }
 183
 184 void occ_shutdown(struct occ *occ)
 185 {
 186         sysfs_remove_group(&occ->bus_dev->kobj, &occ_sysfs);
 187 }
 188 EXPORT_SYMBOL_GPL(occ_shutdown);