366 lines
8.7 KiB
C
366 lines
8.7 KiB
C
/*
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* IBM PowerNV platform sensors for temperature/fan/voltage/power
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* Copyright (C) 2014 IBM
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program.
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*/
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#define DRVNAME "ibmpowernv"
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#define pr_fmt(fmt) DRVNAME ": " fmt
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <asm/opal.h>
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#include <linux/err.h>
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#define MAX_ATTR_LEN 32
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/* Sensor suffix name from DT */
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#define DT_FAULT_ATTR_SUFFIX "faulted"
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#define DT_DATA_ATTR_SUFFIX "data"
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#define DT_THRESHOLD_ATTR_SUFFIX "thrs"
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/*
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* Enumerates all the types of sensors in the POWERNV platform and does index
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* into 'struct sensor_group'
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*/
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enum sensors {
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FAN,
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AMBIENT_TEMP,
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POWER_SUPPLY,
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POWER_INPUT,
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MAX_SENSOR_TYPE,
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};
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static struct sensor_group {
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const char *name;
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const char *compatible;
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struct attribute_group group;
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u32 attr_count;
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} sensor_groups[] = {
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{"fan", "ibm,opal-sensor-cooling-fan"},
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{"temp", "ibm,opal-sensor-amb-temp"},
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{"in", "ibm,opal-sensor-power-supply"},
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{"power", "ibm,opal-sensor-power"}
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};
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struct sensor_data {
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u32 id; /* An opaque id of the firmware for each sensor */
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enum sensors type;
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char name[MAX_ATTR_LEN];
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struct device_attribute dev_attr;
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};
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struct platform_data {
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const struct attribute_group *attr_groups[MAX_SENSOR_TYPE + 1];
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u32 sensors_count; /* Total count of sensors from each group */
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};
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/* Platform device representing all the ibmpowernv sensors */
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static struct platform_device *pdevice;
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static ssize_t show_sensor(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_data *sdata = container_of(devattr, struct sensor_data,
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dev_attr);
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ssize_t ret;
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u32 x;
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ret = opal_get_sensor_data(sdata->id, &x);
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if (ret)
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return ret;
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/* Convert temperature to milli-degrees */
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if (sdata->type == AMBIENT_TEMP)
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x *= 1000;
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/* Convert power to micro-watts */
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else if (sdata->type == POWER_INPUT)
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x *= 1000000;
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return sprintf(buf, "%u\n", x);
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}
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static int __init get_sensor_index_attr(const char *name, u32 *index,
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char *attr)
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{
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char *hash_pos = strchr(name, '#');
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char buf[8] = { 0 };
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char *dash_pos;
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u32 copy_len;
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int err;
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if (!hash_pos)
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return -EINVAL;
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dash_pos = strchr(hash_pos, '-');
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if (!dash_pos)
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return -EINVAL;
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copy_len = dash_pos - hash_pos - 1;
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if (copy_len >= sizeof(buf))
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return -EINVAL;
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strncpy(buf, hash_pos + 1, copy_len);
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err = kstrtou32(buf, 10, index);
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if (err)
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return err;
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strncpy(attr, dash_pos + 1, MAX_ATTR_LEN);
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return 0;
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}
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/*
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* This function translates the DT node name into the 'hwmon' attribute name.
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* IBMPOWERNV device node appear like cooling-fan#2-data, amb-temp#1-thrs etc.
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* which need to be mapped as fan2_input, temp1_max respectively before
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* populating them inside hwmon device class.
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*/
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static int __init create_hwmon_attr_name(struct device *dev, enum sensors type,
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const char *node_name,
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char *hwmon_attr_name)
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{
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char attr_suffix[MAX_ATTR_LEN];
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char *attr_name;
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u32 index;
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int err;
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err = get_sensor_index_attr(node_name, &index, attr_suffix);
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if (err) {
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dev_err(dev, "Sensor device node name '%s' is invalid\n",
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node_name);
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return err;
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}
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if (!strcmp(attr_suffix, DT_FAULT_ATTR_SUFFIX)) {
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attr_name = "fault";
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} else if (!strcmp(attr_suffix, DT_DATA_ATTR_SUFFIX)) {
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attr_name = "input";
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} else if (!strcmp(attr_suffix, DT_THRESHOLD_ATTR_SUFFIX)) {
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if (type == AMBIENT_TEMP)
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attr_name = "max";
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else if (type == FAN)
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attr_name = "min";
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else
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return -ENOENT;
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} else {
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return -ENOENT;
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}
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snprintf(hwmon_attr_name, MAX_ATTR_LEN, "%s%d_%s",
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sensor_groups[type].name, index, attr_name);
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return 0;
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}
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static int __init populate_attr_groups(struct platform_device *pdev)
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{
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struct platform_data *pdata = platform_get_drvdata(pdev);
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const struct attribute_group **pgroups = pdata->attr_groups;
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struct device_node *opal, *np;
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enum sensors type;
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opal = of_find_node_by_path("/ibm,opal/sensors");
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if (!opal) {
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dev_dbg(&pdev->dev, "Opal node 'sensors' not found\n");
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return -ENODEV;
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}
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for_each_child_of_node(opal, np) {
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if (np->name == NULL)
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continue;
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for (type = 0; type < MAX_SENSOR_TYPE; type++)
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if (of_device_is_compatible(np,
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sensor_groups[type].compatible)) {
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sensor_groups[type].attr_count++;
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break;
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}
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}
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of_node_put(opal);
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for (type = 0; type < MAX_SENSOR_TYPE; type++) {
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sensor_groups[type].group.attrs = devm_kzalloc(&pdev->dev,
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sizeof(struct attribute *) *
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(sensor_groups[type].attr_count + 1),
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GFP_KERNEL);
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if (!sensor_groups[type].group.attrs)
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return -ENOMEM;
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pgroups[type] = &sensor_groups[type].group;
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pdata->sensors_count += sensor_groups[type].attr_count;
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sensor_groups[type].attr_count = 0;
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}
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return 0;
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}
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/*
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* Iterate through the device tree for each child of 'sensors' node, create
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* a sysfs attribute file, the file is named by translating the DT node name
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* to the name required by the higher 'hwmon' driver like fan1_input, temp1_max
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* etc..
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*/
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static int __init create_device_attrs(struct platform_device *pdev)
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{
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struct platform_data *pdata = platform_get_drvdata(pdev);
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const struct attribute_group **pgroups = pdata->attr_groups;
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struct device_node *opal, *np;
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struct sensor_data *sdata;
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u32 sensor_id;
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enum sensors type;
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u32 count = 0;
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int err = 0;
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opal = of_find_node_by_path("/ibm,opal/sensors");
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sdata = devm_kzalloc(&pdev->dev, pdata->sensors_count * sizeof(*sdata),
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GFP_KERNEL);
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if (!sdata) {
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err = -ENOMEM;
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goto exit_put_node;
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}
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for_each_child_of_node(opal, np) {
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if (np->name == NULL)
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continue;
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for (type = 0; type < MAX_SENSOR_TYPE; type++)
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if (of_device_is_compatible(np,
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sensor_groups[type].compatible))
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break;
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if (type == MAX_SENSOR_TYPE)
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continue;
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if (of_property_read_u32(np, "sensor-id", &sensor_id)) {
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dev_info(&pdev->dev,
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"'sensor-id' missing in the node '%s'\n",
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np->name);
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continue;
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}
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sdata[count].id = sensor_id;
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sdata[count].type = type;
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err = create_hwmon_attr_name(&pdev->dev, type, np->name,
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sdata[count].name);
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if (err)
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goto exit_put_node;
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sysfs_attr_init(&sdata[count].dev_attr.attr);
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sdata[count].dev_attr.attr.name = sdata[count].name;
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sdata[count].dev_attr.attr.mode = S_IRUGO;
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sdata[count].dev_attr.show = show_sensor;
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pgroups[type]->attrs[sensor_groups[type].attr_count++] =
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&sdata[count++].dev_attr.attr;
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}
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exit_put_node:
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of_node_put(opal);
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return err;
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}
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static int __init ibmpowernv_probe(struct platform_device *pdev)
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{
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struct platform_data *pdata;
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struct device *hwmon_dev;
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int err;
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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platform_set_drvdata(pdev, pdata);
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pdata->sensors_count = 0;
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err = populate_attr_groups(pdev);
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if (err)
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return err;
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/* Create sysfs attribute data for each sensor found in the DT */
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err = create_device_attrs(pdev);
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if (err)
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return err;
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/* Finally, register with hwmon */
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hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, DRVNAME,
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pdata,
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pdata->attr_groups);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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}
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static struct platform_driver ibmpowernv_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = DRVNAME,
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},
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};
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static int __init ibmpowernv_init(void)
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{
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int err;
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pdevice = platform_device_alloc(DRVNAME, 0);
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if (!pdevice) {
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pr_err("Device allocation failed\n");
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err = -ENOMEM;
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goto exit;
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}
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err = platform_device_add(pdevice);
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if (err) {
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pr_err("Device addition failed (%d)\n", err);
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goto exit_device_put;
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}
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err = platform_driver_probe(&ibmpowernv_driver, ibmpowernv_probe);
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if (err) {
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if (err != -ENODEV)
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pr_err("Platform driver probe failed (%d)\n", err);
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goto exit_device_del;
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}
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return 0;
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exit_device_del:
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platform_device_del(pdevice);
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exit_device_put:
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platform_device_put(pdevice);
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exit:
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return err;
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}
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static void __exit ibmpowernv_exit(void)
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{
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platform_driver_unregister(&ibmpowernv_driver);
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platform_device_unregister(pdevice);
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}
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MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>");
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MODULE_DESCRIPTION("IBM POWERNV platform sensors");
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MODULE_LICENSE("GPL");
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module_init(ibmpowernv_init);
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module_exit(ibmpowernv_exit);
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