diff options
Diffstat (limited to 'drivers/hwmon/occ/sysfs.c')
| -rw-r--r-- | drivers/hwmon/occ/sysfs.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/drivers/hwmon/occ/sysfs.c b/drivers/hwmon/occ/sysfs.c new file mode 100644 index 000000000000..743b26ec8e54 --- /dev/null +++ b/drivers/hwmon/occ/sysfs.c @@ -0,0 +1,188 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * OCC hwmon driver sysfs interface + * + * Copyright (C) IBM Corporation 2018 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#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); +} |