| // SPDX-License-Identifier: GPL-2.0+ |
| // Copyright IBM Corp 2019 |
| |
| #include <linux/bitops.h> |
| #include <linux/device.h> |
| #include <linux/hwmon-sysfs.h> |
| #include <linux/kernel.h> |
| #include <linux/sysfs.h> |
| |
| #include "common.h" |
| |
| /* OCC status register */ |
| #define OCC_STAT_MASTER BIT(7) |
| #define OCC_STAT_ACTIVE BIT(0) |
| |
| /* OCC extended status register */ |
| #define OCC_EXT_STAT_DVFS_OT BIT(7) |
| #define OCC_EXT_STAT_DVFS_POWER BIT(6) |
| #define OCC_EXT_STAT_MEM_THROTTLE BIT(5) |
| #define OCC_EXT_STAT_QUICK_DROP BIT(4) |
| |
| static ssize_t occ_sysfs_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| int rc; |
| int val = 0; |
| struct occ *occ = dev_get_drvdata(dev); |
| struct occ_poll_response_header *header; |
| struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr); |
| |
| rc = occ_update_response(occ); |
| if (rc) |
| return rc; |
| |
| header = (struct occ_poll_response_header *)occ->resp.data; |
| |
| switch (sattr->index) { |
| case 0: |
| val = !!(header->status & OCC_STAT_MASTER); |
| break; |
| case 1: |
| val = !!(header->status & OCC_STAT_ACTIVE); |
| break; |
| case 2: |
| val = !!(header->status & OCC_EXT_STAT_DVFS_OT); |
| break; |
| case 3: |
| val = !!(header->status & OCC_EXT_STAT_DVFS_POWER); |
| break; |
| case 4: |
| val = !!(header->status & OCC_EXT_STAT_MEM_THROTTLE); |
| break; |
| case 5: |
| val = !!(header->status & OCC_EXT_STAT_QUICK_DROP); |
| break; |
| case 6: |
| val = header->occ_state; |
| break; |
| case 7: |
| if (header->status & OCC_STAT_MASTER) |
| val = hweight8(header->occs_present); |
| else |
| val = 1; |
| break; |
| case 8: |
| val = occ->error; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return snprintf(buf, PAGE_SIZE - 1, "%d\n", val); |
| } |
| |
| static SENSOR_DEVICE_ATTR(occ_master, 0444, occ_sysfs_show, NULL, 0); |
| static SENSOR_DEVICE_ATTR(occ_active, 0444, occ_sysfs_show, NULL, 1); |
| static SENSOR_DEVICE_ATTR(occ_dvfs_overtemp, 0444, occ_sysfs_show, NULL, 2); |
| static SENSOR_DEVICE_ATTR(occ_dvfs_power, 0444, occ_sysfs_show, NULL, 3); |
| static SENSOR_DEVICE_ATTR(occ_mem_throttle, 0444, occ_sysfs_show, NULL, 4); |
| static SENSOR_DEVICE_ATTR(occ_quick_pwr_drop, 0444, occ_sysfs_show, NULL, 5); |
| static SENSOR_DEVICE_ATTR(occ_state, 0444, occ_sysfs_show, NULL, 6); |
| static SENSOR_DEVICE_ATTR(occs_present, 0444, occ_sysfs_show, NULL, 7); |
| static SENSOR_DEVICE_ATTR(occ_error, 0444, occ_sysfs_show, NULL, 8); |
| |
| static struct attribute *occ_attributes[] = { |
| &sensor_dev_attr_occ_master.dev_attr.attr, |
| &sensor_dev_attr_occ_active.dev_attr.attr, |
| &sensor_dev_attr_occ_dvfs_overtemp.dev_attr.attr, |
| &sensor_dev_attr_occ_dvfs_power.dev_attr.attr, |
| &sensor_dev_attr_occ_mem_throttle.dev_attr.attr, |
| &sensor_dev_attr_occ_quick_pwr_drop.dev_attr.attr, |
| &sensor_dev_attr_occ_state.dev_attr.attr, |
| &sensor_dev_attr_occs_present.dev_attr.attr, |
| &sensor_dev_attr_occ_error.dev_attr.attr, |
| NULL |
| }; |
| |
| static const struct attribute_group occ_sysfs = { |
| .attrs = occ_attributes, |
| }; |
| |
| void occ_sysfs_poll_done(struct occ *occ) |
| { |
| const char *name; |
| struct occ_poll_response_header *header = |
| (struct occ_poll_response_header *)occ->resp.data; |
| |
| /* |
| * On the first poll response, we haven't yet created the sysfs |
| * attributes, so don't make any notify calls. |
| */ |
| if (!occ->hwmon) |
| goto done; |
| |
| if ((header->status & OCC_STAT_MASTER) != |
| (occ->prev_stat & OCC_STAT_MASTER)) { |
| name = sensor_dev_attr_occ_master.dev_attr.attr.name; |
| sysfs_notify(&occ->bus_dev->kobj, NULL, name); |
| } |
| |
| if ((header->status & OCC_STAT_ACTIVE) != |
| (occ->prev_stat & OCC_STAT_ACTIVE)) { |
| name = sensor_dev_attr_occ_active.dev_attr.attr.name; |
| sysfs_notify(&occ->bus_dev->kobj, NULL, name); |
| } |
| |
| if ((header->ext_status & OCC_EXT_STAT_DVFS_OT) != |
| (occ->prev_ext_stat & OCC_EXT_STAT_DVFS_OT)) { |
| name = sensor_dev_attr_occ_dvfs_overtemp.dev_attr.attr.name; |
| sysfs_notify(&occ->bus_dev->kobj, NULL, name); |
| } |
| |
| if ((header->ext_status & OCC_EXT_STAT_DVFS_POWER) != |
| (occ->prev_ext_stat & OCC_EXT_STAT_DVFS_POWER)) { |
| name = sensor_dev_attr_occ_dvfs_power.dev_attr.attr.name; |
| sysfs_notify(&occ->bus_dev->kobj, NULL, name); |
| } |
| |
| if ((header->ext_status & OCC_EXT_STAT_MEM_THROTTLE) != |
| (occ->prev_ext_stat & OCC_EXT_STAT_MEM_THROTTLE)) { |
| name = sensor_dev_attr_occ_mem_throttle.dev_attr.attr.name; |
| sysfs_notify(&occ->bus_dev->kobj, NULL, name); |
| } |
| |
| if ((header->ext_status & OCC_EXT_STAT_QUICK_DROP) != |
| (occ->prev_ext_stat & OCC_EXT_STAT_QUICK_DROP)) { |
| name = sensor_dev_attr_occ_quick_pwr_drop.dev_attr.attr.name; |
| sysfs_notify(&occ->bus_dev->kobj, NULL, name); |
| } |
| |
| if ((header->status & OCC_STAT_MASTER) && |
| header->occs_present != occ->prev_occs_present) { |
| name = sensor_dev_attr_occs_present.dev_attr.attr.name; |
| sysfs_notify(&occ->bus_dev->kobj, NULL, name); |
| } |
| |
| if (occ->error && occ->error != occ->prev_error) { |
| name = sensor_dev_attr_occ_error.dev_attr.attr.name; |
| sysfs_notify(&occ->bus_dev->kobj, NULL, name); |
| } |
| |
| /* no notifications for OCC state; doesn't indicate error condition */ |
| |
| done: |
| occ->prev_error = occ->error; |
| occ->prev_stat = header->status; |
| occ->prev_ext_stat = header->ext_status; |
| occ->prev_occs_present = header->occs_present; |
| } |
| |
| int occ_setup_sysfs(struct occ *occ) |
| { |
| return sysfs_create_group(&occ->bus_dev->kobj, &occ_sysfs); |
| } |
| |
| void occ_shutdown(struct occ *occ) |
| { |
| sysfs_remove_group(&occ->bus_dev->kobj, &occ_sysfs); |
| } |