1e2f05d60SEddie James // SPDX-License-Identifier: GPL-2.0+ 2e2f05d60SEddie James // Copyright IBM Corp 2019 3df04ced6SEddie James 4df04ced6SEddie James #include <linux/bitops.h> 5df04ced6SEddie James #include <linux/device.h> 65679ed99SJean Delvare #include <linux/export.h> 7df04ced6SEddie James #include <linux/hwmon-sysfs.h> 8df04ced6SEddie James #include <linux/kernel.h> 9df04ced6SEddie James #include <linux/sysfs.h> 10df04ced6SEddie James 11df04ced6SEddie James #include "common.h" 12df04ced6SEddie James 13df04ced6SEddie James /* OCC status register */ 14df04ced6SEddie James #define OCC_STAT_MASTER BIT(7) 15df04ced6SEddie James #define OCC_STAT_ACTIVE BIT(0) 16df04ced6SEddie James 17df04ced6SEddie James /* OCC extended status register */ 18df04ced6SEddie James #define OCC_EXT_STAT_DVFS_OT BIT(7) 19df04ced6SEddie James #define OCC_EXT_STAT_DVFS_POWER BIT(6) 20df04ced6SEddie James #define OCC_EXT_STAT_MEM_THROTTLE BIT(5) 21df04ced6SEddie James #define OCC_EXT_STAT_QUICK_DROP BIT(4) 22df04ced6SEddie James 23df04ced6SEddie James static ssize_t occ_sysfs_show(struct device *dev, 24df04ced6SEddie James struct device_attribute *attr, char *buf) 25df04ced6SEddie James { 26df04ced6SEddie James int rc; 27df04ced6SEddie James int val = 0; 28df04ced6SEddie James struct occ *occ = dev_get_drvdata(dev); 29df04ced6SEddie James struct occ_poll_response_header *header; 30df04ced6SEddie James struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr); 31df04ced6SEddie James 32df04ced6SEddie James rc = occ_update_response(occ); 33df04ced6SEddie James if (rc) 34df04ced6SEddie James return rc; 35df04ced6SEddie James 36df04ced6SEddie James header = (struct occ_poll_response_header *)occ->resp.data; 37df04ced6SEddie James 38df04ced6SEddie James switch (sattr->index) { 39df04ced6SEddie James case 0: 40df04ced6SEddie James val = !!(header->status & OCC_STAT_MASTER); 41df04ced6SEddie James break; 42df04ced6SEddie James case 1: 43df04ced6SEddie James val = !!(header->status & OCC_STAT_ACTIVE); 44df04ced6SEddie James break; 45df04ced6SEddie James case 2: 46b88c5049SLei YU val = !!(header->ext_status & OCC_EXT_STAT_DVFS_OT); 47df04ced6SEddie James break; 48df04ced6SEddie James case 3: 49b88c5049SLei YU val = !!(header->ext_status & OCC_EXT_STAT_DVFS_POWER); 50df04ced6SEddie James break; 51df04ced6SEddie James case 4: 52b88c5049SLei YU val = !!(header->ext_status & OCC_EXT_STAT_MEM_THROTTLE); 53df04ced6SEddie James break; 54df04ced6SEddie James case 5: 55b88c5049SLei YU val = !!(header->ext_status & OCC_EXT_STAT_QUICK_DROP); 56df04ced6SEddie James break; 57df04ced6SEddie James case 6: 58df04ced6SEddie James val = header->occ_state; 59df04ced6SEddie James break; 60df04ced6SEddie James case 7: 61df04ced6SEddie James if (header->status & OCC_STAT_MASTER) 62df04ced6SEddie James val = hweight8(header->occs_present); 63df04ced6SEddie James else 64df04ced6SEddie James val = 1; 65df04ced6SEddie James break; 66df04ced6SEddie James default: 67df04ced6SEddie James return -EINVAL; 68df04ced6SEddie James } 69df04ced6SEddie James 70*1f4d4af4SGuenter Roeck return sysfs_emit(buf, "%d\n", val); 71df04ced6SEddie James } 72df04ced6SEddie James 73afe8419eSEddie James static ssize_t occ_error_show(struct device *dev, 74afe8419eSEddie James struct device_attribute *attr, char *buf) 75afe8419eSEddie James { 76afe8419eSEddie James struct occ *occ = dev_get_drvdata(dev); 77afe8419eSEddie James 78afe8419eSEddie James occ_update_response(occ); 79afe8419eSEddie James 80*1f4d4af4SGuenter Roeck return sysfs_emit(buf, "%d\n", occ->error); 81afe8419eSEddie James } 82afe8419eSEddie James 83df04ced6SEddie James static SENSOR_DEVICE_ATTR(occ_master, 0444, occ_sysfs_show, NULL, 0); 84df04ced6SEddie James static SENSOR_DEVICE_ATTR(occ_active, 0444, occ_sysfs_show, NULL, 1); 85df04ced6SEddie James static SENSOR_DEVICE_ATTR(occ_dvfs_overtemp, 0444, occ_sysfs_show, NULL, 2); 86df04ced6SEddie James static SENSOR_DEVICE_ATTR(occ_dvfs_power, 0444, occ_sysfs_show, NULL, 3); 87df04ced6SEddie James static SENSOR_DEVICE_ATTR(occ_mem_throttle, 0444, occ_sysfs_show, NULL, 4); 88df04ced6SEddie James static SENSOR_DEVICE_ATTR(occ_quick_pwr_drop, 0444, occ_sysfs_show, NULL, 5); 89df04ced6SEddie James static SENSOR_DEVICE_ATTR(occ_state, 0444, occ_sysfs_show, NULL, 6); 90df04ced6SEddie James static SENSOR_DEVICE_ATTR(occs_present, 0444, occ_sysfs_show, NULL, 7); 91afe8419eSEddie James static DEVICE_ATTR_RO(occ_error); 92df04ced6SEddie James 93df04ced6SEddie James static struct attribute *occ_attributes[] = { 94df04ced6SEddie James &sensor_dev_attr_occ_master.dev_attr.attr, 95df04ced6SEddie James &sensor_dev_attr_occ_active.dev_attr.attr, 96df04ced6SEddie James &sensor_dev_attr_occ_dvfs_overtemp.dev_attr.attr, 97df04ced6SEddie James &sensor_dev_attr_occ_dvfs_power.dev_attr.attr, 98df04ced6SEddie James &sensor_dev_attr_occ_mem_throttle.dev_attr.attr, 99df04ced6SEddie James &sensor_dev_attr_occ_quick_pwr_drop.dev_attr.attr, 100df04ced6SEddie James &sensor_dev_attr_occ_state.dev_attr.attr, 101df04ced6SEddie James &sensor_dev_attr_occs_present.dev_attr.attr, 102afe8419eSEddie James &dev_attr_occ_error.attr, 103df04ced6SEddie James NULL 104df04ced6SEddie James }; 105df04ced6SEddie James 106df04ced6SEddie James static const struct attribute_group occ_sysfs = { 107df04ced6SEddie James .attrs = occ_attributes, 108df04ced6SEddie James }; 109df04ced6SEddie James 110df04ced6SEddie James void occ_sysfs_poll_done(struct occ *occ) 111df04ced6SEddie James { 112df04ced6SEddie James const char *name; 113df04ced6SEddie James struct occ_poll_response_header *header = 114df04ced6SEddie James (struct occ_poll_response_header *)occ->resp.data; 115df04ced6SEddie James 116df04ced6SEddie James /* 117df04ced6SEddie James * On the first poll response, we haven't yet created the sysfs 118df04ced6SEddie James * attributes, so don't make any notify calls. 119df04ced6SEddie James */ 120df04ced6SEddie James if (!occ->hwmon) 121df04ced6SEddie James goto done; 122df04ced6SEddie James 123df04ced6SEddie James if ((header->status & OCC_STAT_MASTER) != 124df04ced6SEddie James (occ->prev_stat & OCC_STAT_MASTER)) { 125df04ced6SEddie James name = sensor_dev_attr_occ_master.dev_attr.attr.name; 126df04ced6SEddie James sysfs_notify(&occ->bus_dev->kobj, NULL, name); 127df04ced6SEddie James } 128df04ced6SEddie James 129df04ced6SEddie James if ((header->status & OCC_STAT_ACTIVE) != 130df04ced6SEddie James (occ->prev_stat & OCC_STAT_ACTIVE)) { 131df04ced6SEddie James name = sensor_dev_attr_occ_active.dev_attr.attr.name; 132df04ced6SEddie James sysfs_notify(&occ->bus_dev->kobj, NULL, name); 133df04ced6SEddie James } 134df04ced6SEddie James 135df04ced6SEddie James if ((header->ext_status & OCC_EXT_STAT_DVFS_OT) != 136df04ced6SEddie James (occ->prev_ext_stat & OCC_EXT_STAT_DVFS_OT)) { 137df04ced6SEddie James name = sensor_dev_attr_occ_dvfs_overtemp.dev_attr.attr.name; 138df04ced6SEddie James sysfs_notify(&occ->bus_dev->kobj, NULL, name); 139df04ced6SEddie James } 140df04ced6SEddie James 141df04ced6SEddie James if ((header->ext_status & OCC_EXT_STAT_DVFS_POWER) != 142df04ced6SEddie James (occ->prev_ext_stat & OCC_EXT_STAT_DVFS_POWER)) { 143df04ced6SEddie James name = sensor_dev_attr_occ_dvfs_power.dev_attr.attr.name; 144df04ced6SEddie James sysfs_notify(&occ->bus_dev->kobj, NULL, name); 145df04ced6SEddie James } 146df04ced6SEddie James 147df04ced6SEddie James if ((header->ext_status & OCC_EXT_STAT_MEM_THROTTLE) != 148df04ced6SEddie James (occ->prev_ext_stat & OCC_EXT_STAT_MEM_THROTTLE)) { 149df04ced6SEddie James name = sensor_dev_attr_occ_mem_throttle.dev_attr.attr.name; 150df04ced6SEddie James sysfs_notify(&occ->bus_dev->kobj, NULL, name); 151df04ced6SEddie James } 152df04ced6SEddie James 153df04ced6SEddie James if ((header->ext_status & OCC_EXT_STAT_QUICK_DROP) != 154df04ced6SEddie James (occ->prev_ext_stat & OCC_EXT_STAT_QUICK_DROP)) { 155df04ced6SEddie James name = sensor_dev_attr_occ_quick_pwr_drop.dev_attr.attr.name; 156df04ced6SEddie James sysfs_notify(&occ->bus_dev->kobj, NULL, name); 157df04ced6SEddie James } 158df04ced6SEddie James 159df04ced6SEddie James if ((header->status & OCC_STAT_MASTER) && 160df04ced6SEddie James header->occs_present != occ->prev_occs_present) { 161df04ced6SEddie James name = sensor_dev_attr_occs_present.dev_attr.attr.name; 162df04ced6SEddie James sysfs_notify(&occ->bus_dev->kobj, NULL, name); 163df04ced6SEddie James } 164df04ced6SEddie James 165df04ced6SEddie James if (occ->error && occ->error != occ->prev_error) { 166afe8419eSEddie James name = dev_attr_occ_error.attr.name; 167df04ced6SEddie James sysfs_notify(&occ->bus_dev->kobj, NULL, name); 168df04ced6SEddie James } 169df04ced6SEddie James 170df04ced6SEddie James /* no notifications for OCC state; doesn't indicate error condition */ 171df04ced6SEddie James 172df04ced6SEddie James done: 173df04ced6SEddie James occ->prev_error = occ->error; 174df04ced6SEddie James occ->prev_stat = header->status; 175df04ced6SEddie James occ->prev_ext_stat = header->ext_status; 176df04ced6SEddie James occ->prev_occs_present = header->occs_present; 177df04ced6SEddie James } 178df04ced6SEddie James 179df04ced6SEddie James int occ_setup_sysfs(struct occ *occ) 180df04ced6SEddie James { 181df04ced6SEddie James return sysfs_create_group(&occ->bus_dev->kobj, &occ_sysfs); 182df04ced6SEddie James } 183df04ced6SEddie James 184df04ced6SEddie James void occ_shutdown(struct occ *occ) 185df04ced6SEddie James { 186df04ced6SEddie James sysfs_remove_group(&occ->bus_dev->kobj, &occ_sysfs); 187df04ced6SEddie James } 1885679ed99SJean Delvare EXPORT_SYMBOL_GPL(occ_shutdown); 189