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![Shilpasri G Bhat](/assets/img/avatar_default.png)
This patch exports current(A) sensors in inband sensors copied to main memory by OCC. Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> Reviewed-by: Cédric Le Goater <clg@kaod.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
560 lines
13 KiB
C
560 lines
13 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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#include <asm/cputhreads.h>
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#include <asm/smp.h>
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#define MAX_ATTR_LEN 32
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#define MAX_LABEL_LEN 64
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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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TEMP,
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POWER_SUPPLY,
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POWER_INPUT,
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CURRENT,
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MAX_SENSOR_TYPE,
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};
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#define INVALID_INDEX (-1U)
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/*
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* 'compatible' string properties for sensor types as defined in old
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* PowerNV firmware (skiboot). These are ordered as 'enum sensors'.
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*/
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static const char * const legacy_compatibles[] = {
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"ibm,opal-sensor-cooling-fan",
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"ibm,opal-sensor-amb-temp",
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"ibm,opal-sensor-power-supply",
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"ibm,opal-sensor-power"
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};
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static struct sensor_group {
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const char *name; /* matches property 'sensor-type' */
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struct attribute_group group;
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u32 attr_count;
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u32 hwmon_index;
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} sensor_groups[] = {
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{ "fan" },
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{ "temp" },
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{ "in" },
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{ "power" },
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{ "curr" },
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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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u32 hwmon_index;
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u32 opal_index;
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enum sensors type;
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char label[MAX_LABEL_LEN];
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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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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 == 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 ssize_t show_label(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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return sprintf(buf, "%s\n", sdata->label);
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}
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static int __init get_logical_cpu(int hwcpu)
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{
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int cpu;
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for_each_possible_cpu(cpu)
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if (get_hard_smp_processor_id(cpu) == hwcpu)
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return cpu;
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return -ENOENT;
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}
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static void __init make_sensor_label(struct device_node *np,
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struct sensor_data *sdata,
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const char *label)
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{
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u32 id;
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size_t n;
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n = snprintf(sdata->label, sizeof(sdata->label), "%s", label);
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/*
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* Core temp pretty print
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*/
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if (!of_property_read_u32(np, "ibm,pir", &id)) {
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int cpuid = get_logical_cpu(id);
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if (cpuid >= 0)
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/*
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* The digital thermal sensors are associated
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* with a core.
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*/
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n += snprintf(sdata->label + n,
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sizeof(sdata->label) - n, " %d",
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cpuid);
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else
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n += snprintf(sdata->label + n,
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sizeof(sdata->label) - n, " phy%d", id);
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}
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/*
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* Membuffer pretty print
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*/
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if (!of_property_read_u32(np, "ibm,chip-id", &id))
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n += snprintf(sdata->label + n, sizeof(sdata->label) - n,
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" %d", id & 0xffff);
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}
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static int get_sensor_index_attr(const char *name, u32 *index, 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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static const char *convert_opal_attr_name(enum sensors type,
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const char *opal_attr)
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{
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const char *attr_name = NULL;
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if (!strcmp(opal_attr, DT_FAULT_ATTR_SUFFIX)) {
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attr_name = "fault";
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} else if (!strcmp(opal_attr, DT_DATA_ATTR_SUFFIX)) {
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attr_name = "input";
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} else if (!strcmp(opal_attr, DT_THRESHOLD_ATTR_SUFFIX)) {
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if (type == 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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}
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return attr_name;
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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 const char *parse_opal_node_name(const char *node_name,
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enum sensors type, u32 *index)
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{
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char attr_suffix[MAX_ATTR_LEN];
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const char *attr_name;
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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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return ERR_PTR(err);
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attr_name = convert_opal_attr_name(type, attr_suffix);
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if (!attr_name)
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return ERR_PTR(-ENOENT);
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return attr_name;
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}
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static int get_sensor_type(struct device_node *np)
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{
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enum sensors type;
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const char *str;
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for (type = 0; type < ARRAY_SIZE(legacy_compatibles); type++) {
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if (of_device_is_compatible(np, legacy_compatibles[type]))
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return type;
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}
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/*
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* Let's check if we have a newer device tree
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*/
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if (!of_device_is_compatible(np, "ibm,opal-sensor"))
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return MAX_SENSOR_TYPE;
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if (of_property_read_string(np, "sensor-type", &str))
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return MAX_SENSOR_TYPE;
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for (type = 0; type < MAX_SENSOR_TYPE; type++)
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if (!strcmp(str, sensor_groups[type].name))
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return type;
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return MAX_SENSOR_TYPE;
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}
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static u32 get_sensor_hwmon_index(struct sensor_data *sdata,
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struct sensor_data *sdata_table, int count)
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{
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int i;
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/*
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* We don't use the OPAL index on newer device trees
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*/
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if (sdata->opal_index != INVALID_INDEX) {
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for (i = 0; i < count; i++)
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if (sdata_table[i].opal_index == sdata->opal_index &&
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sdata_table[i].type == sdata->type)
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return sdata_table[i].hwmon_index;
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}
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return ++sensor_groups[sdata->type].hwmon_index;
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}
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static int 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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for_each_child_of_node(opal, np) {
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const char *label;
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if (np->name == NULL)
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continue;
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type = get_sensor_type(np);
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if (type == MAX_SENSOR_TYPE)
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continue;
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sensor_groups[type].attr_count++;
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/*
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* add attributes for labels, min and max
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*/
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if (!of_property_read_string(np, "label", &label))
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sensor_groups[type].attr_count++;
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if (of_find_property(np, "sensor-data-min", NULL))
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sensor_groups[type].attr_count++;
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if (of_find_property(np, "sensor-data-max", NULL))
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sensor_groups[type].attr_count++;
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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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static void create_hwmon_attr(struct sensor_data *sdata, const char *attr_name,
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ssize_t (*show)(struct device *dev,
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struct device_attribute *attr,
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char *buf))
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{
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snprintf(sdata->name, MAX_ATTR_LEN, "%s%d_%s",
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sensor_groups[sdata->type].name, sdata->hwmon_index,
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attr_name);
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sysfs_attr_init(&sdata->dev_attr.attr);
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sdata->dev_attr.attr.name = sdata->name;
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sdata->dev_attr.attr.mode = S_IRUGO;
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sdata->dev_attr.show = show;
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}
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static void populate_sensor(struct sensor_data *sdata, int od, int hd, int sid,
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const char *attr_name, enum sensors type,
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const struct attribute_group *pgroup,
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ssize_t (*show)(struct device *dev,
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struct device_attribute *attr,
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char *buf))
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{
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sdata->id = sid;
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sdata->type = type;
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sdata->opal_index = od;
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sdata->hwmon_index = hd;
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create_hwmon_attr(sdata, attr_name, show);
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pgroup->attrs[sensor_groups[type].attr_count++] = &sdata->dev_attr.attr;
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}
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static char *get_max_attr(enum sensors type)
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{
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switch (type) {
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case POWER_INPUT:
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return "input_highest";
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default:
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return "highest";
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}
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}
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static char *get_min_attr(enum sensors type)
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{
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switch (type) {
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case POWER_INPUT:
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return "input_lowest";
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default:
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return "lowest";
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}
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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 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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const char *attr_name;
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u32 opal_index;
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const char *label;
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if (np->name == NULL)
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continue;
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type = get_sensor_type(np);
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if (type == MAX_SENSOR_TYPE)
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continue;
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/*
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* Newer device trees use a "sensor-data" property
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* name for input.
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*/
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if (of_property_read_u32(np, "sensor-id", &sensor_id) &&
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of_property_read_u32(np, "sensor-data", &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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/*
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* If we can not parse the node name, it means we are
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* running on a newer device tree. We can just forget
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* about the OPAL index and use a defaut value for the
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* hwmon attribute name
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*/
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attr_name = parse_opal_node_name(np->name, type, &opal_index);
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if (IS_ERR(attr_name)) {
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attr_name = "input";
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opal_index = INVALID_INDEX;
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}
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sdata[count].opal_index = opal_index;
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sdata[count].hwmon_index =
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get_sensor_hwmon_index(&sdata[count], sdata, count);
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create_hwmon_attr(&sdata[count], attr_name, 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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if (!of_property_read_string(np, "label", &label)) {
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/*
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* For the label attribute, we can reuse the
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* "properties" of the previous "input"
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* attribute. They are related to the same
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* sensor.
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*/
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make_sensor_label(np, &sdata[count], label);
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populate_sensor(&sdata[count], opal_index,
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sdata[count - 1].hwmon_index,
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sensor_id, "label", type, pgroups[type],
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show_label);
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count++;
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}
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if (!of_property_read_u32(np, "sensor-data-max", &sensor_id)) {
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attr_name = get_max_attr(type);
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populate_sensor(&sdata[count], opal_index,
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sdata[count - 1].hwmon_index,
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sensor_id, attr_name, type,
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pgroups[type], show_sensor);
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count++;
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}
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if (!of_property_read_u32(np, "sensor-data-min", &sensor_id)) {
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attr_name = get_min_attr(type);
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populate_sensor(&sdata[count], opal_index,
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sdata[count - 1].hwmon_index,
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sensor_id, attr_name, type,
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pgroups[type], show_sensor);
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count++;
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}
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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 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);
|
|
}
|
|
|
|
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");
|