diff options
Diffstat (limited to 'drivers/hwmon/ibmpowernv.c')
| -rw-r--r-- | drivers/hwmon/ibmpowernv.c | 737 |
1 files changed, 737 insertions, 0 deletions
diff --git a/drivers/hwmon/ibmpowernv.c b/drivers/hwmon/ibmpowernv.c new file mode 100644 index 000000000..64d05edff --- /dev/null +++ b/drivers/hwmon/ibmpowernv.c @@ -0,0 +1,737 @@ +/* + * IBM PowerNV platform sensors for temperature/fan/voltage/power + * Copyright (C) 2014 IBM + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. + */ + +#define DRVNAME "ibmpowernv" +#define pr_fmt(fmt) DRVNAME ": " fmt + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/of.h> +#include <linux/slab.h> + +#include <linux/platform_device.h> +#include <asm/opal.h> +#include <linux/err.h> +#include <asm/cputhreads.h> +#include <asm/smp.h> + +#define MAX_ATTR_LEN 32 +#define MAX_LABEL_LEN 64 + +/* Sensor suffix name from DT */ +#define DT_FAULT_ATTR_SUFFIX "faulted" +#define DT_DATA_ATTR_SUFFIX "data" +#define DT_THRESHOLD_ATTR_SUFFIX "thrs" + +/* + * Enumerates all the types of sensors in the POWERNV platform and does index + * into 'struct sensor_group' + */ +enum sensors { + FAN, + TEMP, + POWER_SUPPLY, + POWER_INPUT, + CURRENT, + ENERGY, + MAX_SENSOR_TYPE, +}; + +#define INVALID_INDEX (-1U) + +/* + * 'compatible' string properties for sensor types as defined in old + * PowerNV firmware (skiboot). These are ordered as 'enum sensors'. + */ +static const char * const legacy_compatibles[] = { + "ibm,opal-sensor-cooling-fan", + "ibm,opal-sensor-amb-temp", + "ibm,opal-sensor-power-supply", + "ibm,opal-sensor-power" +}; + +static struct sensor_group { + const char *name; /* matches property 'sensor-type' */ + struct attribute_group group; + u32 attr_count; + u32 hwmon_index; +} sensor_groups[] = { + { "fan" }, + { "temp" }, + { "in" }, + { "power" }, + { "curr" }, + { "energy" }, +}; + +struct sensor_data { + u32 id; /* An opaque id of the firmware for each sensor */ + u32 hwmon_index; + u32 opal_index; + enum sensors type; + char label[MAX_LABEL_LEN]; + char name[MAX_ATTR_LEN]; + struct device_attribute dev_attr; + struct sensor_group_data *sgrp_data; +}; + +struct sensor_group_data { + struct mutex mutex; + u32 gid; + bool enable; +}; + +struct platform_data { + const struct attribute_group *attr_groups[MAX_SENSOR_TYPE + 1]; + struct sensor_group_data *sgrp_data; + u32 sensors_count; /* Total count of sensors from each group */ + u32 nr_sensor_groups; /* Total number of sensor groups */ +}; + +static ssize_t show_sensor(struct device *dev, struct device_attribute *devattr, + char *buf) +{ + struct sensor_data *sdata = container_of(devattr, struct sensor_data, + dev_attr); + ssize_t ret; + u64 x; + + if (sdata->sgrp_data && !sdata->sgrp_data->enable) + return -ENODATA; + + ret = opal_get_sensor_data_u64(sdata->id, &x); + + if (ret) + return ret; + + /* Convert temperature to milli-degrees */ + if (sdata->type == TEMP) + x *= 1000; + /* Convert power to micro-watts */ + else if (sdata->type == POWER_INPUT) + x *= 1000000; + + return sprintf(buf, "%llu\n", x); +} + +static ssize_t show_enable(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct sensor_data *sdata = container_of(devattr, struct sensor_data, + dev_attr); + + return sprintf(buf, "%u\n", sdata->sgrp_data->enable); +} + +static ssize_t store_enable(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct sensor_data *sdata = container_of(devattr, struct sensor_data, + dev_attr); + struct sensor_group_data *sgrp_data = sdata->sgrp_data; + int ret; + bool data; + + ret = kstrtobool(buf, &data); + if (ret) + return ret; + + ret = mutex_lock_interruptible(&sgrp_data->mutex); + if (ret) + return ret; + + if (data != sgrp_data->enable) { + ret = sensor_group_enable(sgrp_data->gid, data); + if (!ret) + sgrp_data->enable = data; + } + + if (!ret) + ret = count; + + mutex_unlock(&sgrp_data->mutex); + return ret; +} + +static ssize_t show_label(struct device *dev, struct device_attribute *devattr, + char *buf) +{ + struct sensor_data *sdata = container_of(devattr, struct sensor_data, + dev_attr); + + return sprintf(buf, "%s\n", sdata->label); +} + +static int get_logical_cpu(int hwcpu) +{ + int cpu; + + for_each_possible_cpu(cpu) + if (get_hard_smp_processor_id(cpu) == hwcpu) + return cpu; + + return -ENOENT; +} + +static void make_sensor_label(struct device_node *np, + struct sensor_data *sdata, const char *label) +{ + u32 id; + size_t n; + + n = snprintf(sdata->label, sizeof(sdata->label), "%s", label); + + /* + * Core temp pretty print + */ + if (!of_property_read_u32(np, "ibm,pir", &id)) { + int cpuid = get_logical_cpu(id); + + if (cpuid >= 0) + /* + * The digital thermal sensors are associated + * with a core. + */ + n += snprintf(sdata->label + n, + sizeof(sdata->label) - n, " %d", + cpuid); + else + n += snprintf(sdata->label + n, + sizeof(sdata->label) - n, " phy%d", id); + } + + /* + * Membuffer pretty print + */ + if (!of_property_read_u32(np, "ibm,chip-id", &id)) + n += snprintf(sdata->label + n, sizeof(sdata->label) - n, + " %d", id & 0xffff); +} + +static int get_sensor_index_attr(const char *name, u32 *index, char *attr) +{ + char *hash_pos = strchr(name, '#'); + char buf[8] = { 0 }; + char *dash_pos; + u32 copy_len; + int err; + + if (!hash_pos) + return -EINVAL; + + dash_pos = strchr(hash_pos, '-'); + if (!dash_pos) + return -EINVAL; + + copy_len = dash_pos - hash_pos - 1; + if (copy_len >= sizeof(buf)) + return -EINVAL; + + strncpy(buf, hash_pos + 1, copy_len); + + err = kstrtou32(buf, 10, index); + if (err) + return err; + + strncpy(attr, dash_pos + 1, MAX_ATTR_LEN); + + return 0; +} + +static const char *convert_opal_attr_name(enum sensors type, + const char *opal_attr) +{ + const char *attr_name = NULL; + + if (!strcmp(opal_attr, DT_FAULT_ATTR_SUFFIX)) { + attr_name = "fault"; + } else if (!strcmp(opal_attr, DT_DATA_ATTR_SUFFIX)) { + attr_name = "input"; + } else if (!strcmp(opal_attr, DT_THRESHOLD_ATTR_SUFFIX)) { + if (type == TEMP) + attr_name = "max"; + else if (type == FAN) + attr_name = "min"; + } + + return attr_name; +} + +/* + * This function translates the DT node name into the 'hwmon' attribute name. + * IBMPOWERNV device node appear like cooling-fan#2-data, amb-temp#1-thrs etc. + * which need to be mapped as fan2_input, temp1_max respectively before + * populating them inside hwmon device class. + */ +static const char *parse_opal_node_name(const char *node_name, + enum sensors type, u32 *index) +{ + char attr_suffix[MAX_ATTR_LEN]; + const char *attr_name; + int err; + + err = get_sensor_index_attr(node_name, index, attr_suffix); + if (err) + return ERR_PTR(err); + + attr_name = convert_opal_attr_name(type, attr_suffix); + if (!attr_name) + return ERR_PTR(-ENOENT); + + return attr_name; +} + +static int get_sensor_type(struct device_node *np) +{ + enum sensors type; + const char *str; + + for (type = 0; type < ARRAY_SIZE(legacy_compatibles); type++) { + if (of_device_is_compatible(np, legacy_compatibles[type])) + return type; + } + + /* + * Let's check if we have a newer device tree + */ + if (!of_device_is_compatible(np, "ibm,opal-sensor")) + return MAX_SENSOR_TYPE; + + if (of_property_read_string(np, "sensor-type", &str)) + return MAX_SENSOR_TYPE; + + for (type = 0; type < MAX_SENSOR_TYPE; type++) + if (!strcmp(str, sensor_groups[type].name)) + return type; + + return MAX_SENSOR_TYPE; +} + +static u32 get_sensor_hwmon_index(struct sensor_data *sdata, + struct sensor_data *sdata_table, int count) +{ + int i; + + /* + * We don't use the OPAL index on newer device trees + */ + if (sdata->opal_index != INVALID_INDEX) { + for (i = 0; i < count; i++) + if (sdata_table[i].opal_index == sdata->opal_index && + sdata_table[i].type == sdata->type) + return sdata_table[i].hwmon_index; + } + return ++sensor_groups[sdata->type].hwmon_index; +} + +static int init_sensor_group_data(struct platform_device *pdev, + struct platform_data *pdata) +{ + struct sensor_group_data *sgrp_data; + struct device_node *groups, *sgrp; + int count = 0, ret = 0; + enum sensors type; + + groups = of_find_compatible_node(NULL, NULL, "ibm,opal-sensor-group"); + if (!groups) + return ret; + + for_each_child_of_node(groups, sgrp) { + type = get_sensor_type(sgrp); + if (type != MAX_SENSOR_TYPE) + pdata->nr_sensor_groups++; + } + + if (!pdata->nr_sensor_groups) + goto out; + + sgrp_data = devm_kcalloc(&pdev->dev, pdata->nr_sensor_groups, + sizeof(*sgrp_data), GFP_KERNEL); + if (!sgrp_data) { + ret = -ENOMEM; + goto out; + } + + for_each_child_of_node(groups, sgrp) { + u32 gid; + + type = get_sensor_type(sgrp); + if (type == MAX_SENSOR_TYPE) + continue; + + if (of_property_read_u32(sgrp, "sensor-group-id", &gid)) + continue; + + if (of_count_phandle_with_args(sgrp, "sensors", NULL) <= 0) + continue; + + sensor_groups[type].attr_count++; + sgrp_data[count].gid = gid; + mutex_init(&sgrp_data[count].mutex); + sgrp_data[count++].enable = false; + } + + pdata->sgrp_data = sgrp_data; +out: + of_node_put(groups); + return ret; +} + +static struct sensor_group_data *get_sensor_group(struct platform_data *pdata, + struct device_node *node, + enum sensors gtype) +{ + struct sensor_group_data *sgrp_data = pdata->sgrp_data; + struct device_node *groups, *sgrp; + + groups = of_find_compatible_node(NULL, NULL, "ibm,opal-sensor-group"); + if (!groups) + return NULL; + + for_each_child_of_node(groups, sgrp) { + struct of_phandle_iterator it; + u32 gid; + int rc, i; + enum sensors type; + + type = get_sensor_type(sgrp); + if (type != gtype) + continue; + + if (of_property_read_u32(sgrp, "sensor-group-id", &gid)) + continue; + + of_for_each_phandle(&it, rc, sgrp, "sensors", NULL, 0) + if (it.phandle == node->phandle) { + of_node_put(it.node); + break; + } + + if (rc) + continue; + + for (i = 0; i < pdata->nr_sensor_groups; i++) + if (gid == sgrp_data[i].gid) { + of_node_put(sgrp); + of_node_put(groups); + return &sgrp_data[i]; + } + } + + of_node_put(groups); + return NULL; +} + +static int populate_attr_groups(struct platform_device *pdev) +{ + struct platform_data *pdata = platform_get_drvdata(pdev); + const struct attribute_group **pgroups = pdata->attr_groups; + struct device_node *opal, *np; + enum sensors type; + int ret; + + ret = init_sensor_group_data(pdev, pdata); + if (ret) + return ret; + + opal = of_find_node_by_path("/ibm,opal/sensors"); + for_each_child_of_node(opal, np) { + const char *label; + + if (np->name == NULL) + continue; + + type = get_sensor_type(np); + if (type == MAX_SENSOR_TYPE) + continue; + + sensor_groups[type].attr_count++; + + /* + * add attributes for labels, min and max + */ + if (!of_property_read_string(np, "label", &label)) + sensor_groups[type].attr_count++; + if (of_find_property(np, "sensor-data-min", NULL)) + sensor_groups[type].attr_count++; + if (of_find_property(np, "sensor-data-max", NULL)) + sensor_groups[type].attr_count++; + } + + of_node_put(opal); + + for (type = 0; type < MAX_SENSOR_TYPE; type++) { + sensor_groups[type].group.attrs = devm_kcalloc(&pdev->dev, + sensor_groups[type].attr_count + 1, + sizeof(struct attribute *), + GFP_KERNEL); + if (!sensor_groups[type].group.attrs) + return -ENOMEM; + + pgroups[type] = &sensor_groups[type].group; + pdata->sensors_count += sensor_groups[type].attr_count; + sensor_groups[type].attr_count = 0; + } + + return 0; +} + +static void create_hwmon_attr(struct sensor_data *sdata, const char *attr_name, + ssize_t (*show)(struct device *dev, + struct device_attribute *attr, + char *buf), + ssize_t (*store)(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count)) +{ + snprintf(sdata->name, MAX_ATTR_LEN, "%s%d_%s", + sensor_groups[sdata->type].name, sdata->hwmon_index, + attr_name); + + sysfs_attr_init(&sdata->dev_attr.attr); + sdata->dev_attr.attr.name = sdata->name; + sdata->dev_attr.show = show; + if (store) { + sdata->dev_attr.store = store; + sdata->dev_attr.attr.mode = 0664; + } else { + sdata->dev_attr.attr.mode = 0444; + } +} + +static void populate_sensor(struct sensor_data *sdata, int od, int hd, int sid, + const char *attr_name, enum sensors type, + const struct attribute_group *pgroup, + struct sensor_group_data *sgrp_data, + ssize_t (*show)(struct device *dev, + struct device_attribute *attr, + char *buf), + ssize_t (*store)(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count)) +{ + sdata->id = sid; + sdata->type = type; + sdata->opal_index = od; + sdata->hwmon_index = hd; + create_hwmon_attr(sdata, attr_name, show, store); + pgroup->attrs[sensor_groups[type].attr_count++] = &sdata->dev_attr.attr; + sdata->sgrp_data = sgrp_data; +} + +static char *get_max_attr(enum sensors type) +{ + switch (type) { + case POWER_INPUT: + return "input_highest"; + default: + return "highest"; + } +} + +static char *get_min_attr(enum sensors type) +{ + switch (type) { + case POWER_INPUT: + return "input_lowest"; + default: + return "lowest"; + } +} + +/* + * Iterate through the device tree for each child of 'sensors' node, create + * a sysfs attribute file, the file is named by translating the DT node name + * to the name required by the higher 'hwmon' driver like fan1_input, temp1_max + * etc.. + */ +static int create_device_attrs(struct platform_device *pdev) +{ + struct platform_data *pdata = platform_get_drvdata(pdev); + const struct attribute_group **pgroups = pdata->attr_groups; + struct device_node *opal, *np; + struct sensor_data *sdata; + u32 count = 0; + u32 group_attr_id[MAX_SENSOR_TYPE] = {0}; + + sdata = devm_kcalloc(&pdev->dev, + pdata->sensors_count, sizeof(*sdata), + GFP_KERNEL); + if (!sdata) + return -ENOMEM; + + opal = of_find_node_by_path("/ibm,opal/sensors"); + for_each_child_of_node(opal, np) { + struct sensor_group_data *sgrp_data; + const char *attr_name; + u32 opal_index, hw_id; + u32 sensor_id; + const char *label; + enum sensors type; + + if (np->name == NULL) + continue; + + type = get_sensor_type(np); + if (type == MAX_SENSOR_TYPE) + continue; + + /* + * Newer device trees use a "sensor-data" property + * name for input. + */ + if (of_property_read_u32(np, "sensor-id", &sensor_id) && + of_property_read_u32(np, "sensor-data", &sensor_id)) { + dev_info(&pdev->dev, + "'sensor-id' missing in the node '%s'\n", + np->name); + continue; + } + + sdata[count].id = sensor_id; + sdata[count].type = type; + + /* + * If we can not parse the node name, it means we are + * running on a newer device tree. We can just forget + * about the OPAL index and use a defaut value for the + * hwmon attribute name + */ + attr_name = parse_opal_node_name(np->name, type, &opal_index); + if (IS_ERR(attr_name)) { + attr_name = "input"; + opal_index = INVALID_INDEX; + } + + hw_id = get_sensor_hwmon_index(&sdata[count], sdata, count); + sgrp_data = get_sensor_group(pdata, np, type); + populate_sensor(&sdata[count], opal_index, hw_id, sensor_id, + attr_name, type, pgroups[type], sgrp_data, + show_sensor, NULL); + count++; + + if (!of_property_read_string(np, "label", &label)) { + /* + * For the label attribute, we can reuse the + * "properties" of the previous "input" + * attribute. They are related to the same + * sensor. + */ + + make_sensor_label(np, &sdata[count], label); + populate_sensor(&sdata[count], opal_index, hw_id, + sensor_id, "label", type, pgroups[type], + NULL, show_label, NULL); + count++; + } + + if (!of_property_read_u32(np, "sensor-data-max", &sensor_id)) { + attr_name = get_max_attr(type); + populate_sensor(&sdata[count], opal_index, hw_id, + sensor_id, attr_name, type, + pgroups[type], sgrp_data, show_sensor, + NULL); + count++; + } + + if (!of_property_read_u32(np, "sensor-data-min", &sensor_id)) { + attr_name = get_min_attr(type); + populate_sensor(&sdata[count], opal_index, hw_id, + sensor_id, attr_name, type, + pgroups[type], sgrp_data, show_sensor, + NULL); + count++; + } + + if (sgrp_data && !sgrp_data->enable) { + sgrp_data->enable = true; + hw_id = ++group_attr_id[type]; + populate_sensor(&sdata[count], opal_index, hw_id, + sgrp_data->gid, "enable", type, + pgroups[type], sgrp_data, show_enable, + store_enable); + count++; + } + } + + of_node_put(opal); + return 0; +} + +static int ibmpowernv_probe(struct platform_device *pdev) +{ + struct platform_data *pdata; + struct device *hwmon_dev; + int err; + + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + platform_set_drvdata(pdev, pdata); + pdata->sensors_count = 0; + pdata->nr_sensor_groups = 0; + err = populate_attr_groups(pdev); + if (err) + return err; + + /* Create sysfs attribute data for each sensor found in the DT */ + err = create_device_attrs(pdev); + if (err) + return err; + + /* Finally, register with hwmon */ + hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, DRVNAME, + pdata, + pdata->attr_groups); + + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +static const struct platform_device_id opal_sensor_driver_ids[] = { + { + .name = "opal-sensor", + }, + { } +}; +MODULE_DEVICE_TABLE(platform, opal_sensor_driver_ids); + +static const struct of_device_id opal_sensor_match[] = { + { .compatible = "ibm,opal-sensor" }, + { }, +}; +MODULE_DEVICE_TABLE(of, opal_sensor_match); + +static struct platform_driver ibmpowernv_driver = { + .probe = ibmpowernv_probe, + .id_table = opal_sensor_driver_ids, + .driver = { + .name = DRVNAME, + .of_match_table = opal_sensor_match, + }, +}; + +module_platform_driver(ibmpowernv_driver); + +MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>"); +MODULE_DESCRIPTION("IBM POWERNV platform sensors"); +MODULE_LICENSE("GPL"); |