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/*
* 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 platform_data {
const struct attribute_group *attr_groups[MAX_SENSOR_TYPE + 1];
u32 sensors_count; /* Total count of sensors from each group */
};
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;
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_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 __init 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 __init 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;
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