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authorNeelesh Gupta <neelegup@linux.vnet.ibm.com>2014-07-08 14:38:38 +0530
committerGuenter Roeck <linux@roeck-us.net>2014-08-04 07:01:38 -0700
commit24c1aa8587922ba1a3ca4fa58748e94f13b97fab (patch)
tree23188964ca0a6267c453c1559f00ed0adcd821f8 /drivers/hwmon
parenta8bfeceb0c1400b9331c00f6969afa6cb82d5d4a (diff)
downloadblackbird-op-linux-24c1aa8587922ba1a3ca4fa58748e94f13b97fab.tar.gz
blackbird-op-linux-24c1aa8587922ba1a3ca4fa58748e94f13b97fab.zip
hwmon: (powerpc/powernv) hwmon driver for power, fan rpm, voltage and temperature
This patch adds basic kernel support for reading power values, fan speed rpm, voltage and temperature data on powernv platforms which will be exported to user space through sysfs interface. Test results: ------------- [root@tul163p1 ~]# sensors ibmpowernv-isa-0000 Adapter: ISA adapter fan1: 5465 RPM (min = 0 RPM) fan2: 5152 RPM (min = 0 RPM) fan3: 5521 RPM (min = 0 RPM) fan4: 4891 RPM (min = 0 RPM) fan5: 0 RPM (min = 0 RPM) fan6: 0 RPM (min = 0 RPM) fan7: 7480 RPM (min = 0 RPM) fan8: 7944 RPM (min = 0 RPM) temp1: +39.0°C (high = +0.0°C) power1: 190.00 W [root@tul163p1 ~]# ls /sys/devices/platform/ alarmtimer ibmpowernv.0 power rtc-generic serial8250 uevent [root@tul163p1 ~]# ls /sys/devices/platform/ibmpowernv.0/hwmon/hwmon0/ device fan2_min fan4_min fan6_min fan8_min power fan1_fault fan3_fault fan5_fault fan7_fault in1_fault power1_input fan1_input fan3_input fan5_input fan7_input in2_fault subsystem fan1_min fan3_min fan5_min fan7_min in3_fault temp1_input fan2_fault fan4_fault fan6_fault fan8_fault in4_fault temp1_max fan2_input fan4_input fan6_input fan8_input name uevent [root@tul163p1 ~]# ls /sys/class/hwmon/hwmon0/ device fan2_min fan4_min fan6_min fan8_min power fan1_fault fan3_fault fan5_fault fan7_fault in1_fault power1_input fan1_input fan3_input fan5_input fan7_input in2_fault subsystem fan1_min fan3_min fan5_min fan7_min in3_fault temp1_input fan2_fault fan4_fault fan6_fault fan8_fault in4_fault temp1_max fan2_input fan4_input fan6_input fan8_input name uevent [root@tul163p1 ~]# Signed-off-by: Neelesh Gupta <neelegup@linux.vnet.ibm.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/Kconfig11
-rw-r--r--drivers/hwmon/Makefile1
-rw-r--r--drivers/hwmon/ibmpowernv.c364
3 files changed, 376 insertions, 0 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 37908ff8f7ff..c0aec8db462f 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -554,6 +554,17 @@ config SENSORS_IBMPEX
This driver can also be built as a module. If so, the module
will be called ibmpex.
+config SENSORS_IBMPOWERNV
+ tristate "IBM POWERNV platform sensors"
+ depends on PPC_POWERNV
+ default y
+ help
+ If you say yes here you get support for the temperature/fan/power
+ sensors on your PowerNV platform.
+
+ This driver can also be built as a module. If so, the module
+ will be called ibmpowernv.
+
config SENSORS_IIO_HWMON
tristate "Hwmon driver that uses channels specified via iio maps"
depends on IIO
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 1362382a3187..f4435ea6b169 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -71,6 +71,7 @@ obj-$(CONFIG_SENSORS_ULTRA45) += ultra45_env.o
obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb.o
obj-$(CONFIG_SENSORS_IBMAEM) += ibmaem.o
obj-$(CONFIG_SENSORS_IBMPEX) += ibmpex.o
+obj-$(CONFIG_SENSORS_IBMPOWERNV)+= ibmpowernv.o
obj-$(CONFIG_SENSORS_IIO_HWMON) += iio_hwmon.o
obj-$(CONFIG_SENSORS_INA209) += ina209.o
obj-$(CONFIG_SENSORS_INA2XX) += ina2xx.o
diff --git a/drivers/hwmon/ibmpowernv.c b/drivers/hwmon/ibmpowernv.c
new file mode 100644
index 000000000000..e6b652a35815
--- /dev/null
+++ b/drivers/hwmon/ibmpowernv.c
@@ -0,0 +1,364 @@
+/*
+ * 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>
+
+#define MAX_ATTR_LEN 32
+
+/* 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,
+ AMBIENT_TEMP,
+ POWER_SUPPLY,
+ POWER_INPUT,
+ MAX_SENSOR_TYPE,
+};
+
+static struct sensor_group {
+ const char *name;
+ const char *compatible;
+ struct attribute_group group;
+ u32 attr_count;
+} sensor_groups[] = {
+ {"fan", "ibm,opal-sensor-cooling-fan"},
+ {"temp", "ibm,opal-sensor-amb-temp"},
+ {"in", "ibm,opal-sensor-power-supply"},
+ {"power", "ibm,opal-sensor-power"}
+};
+
+struct sensor_data {
+ u32 id; /* An opaque id of the firmware for each sensor */
+ enum sensors type;
+ 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 */
+};
+
+/* Platform device representing all the ibmpowernv sensors */
+static struct platform_device *pdevice;
+
+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;
+ u32 x;
+
+ ret = opal_get_sensor_data(sdata->id, &x);
+ if (ret)
+ return ret;
+
+ /* Convert temperature to milli-degrees */
+ if (sdata->type == AMBIENT_TEMP)
+ x *= 1000;
+ /* Convert power to micro-watts */
+ else if (sdata->type == POWER_INPUT)
+ x *= 1000000;
+
+ return sprintf(buf, "%u\n", x);
+}
+
+static int __init 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;
+}
+
+/*
+ * 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 int __init create_hwmon_attr_name(struct device *dev, enum sensors type,
+ const char *node_name,
+ char *hwmon_attr_name)
+{
+ char attr_suffix[MAX_ATTR_LEN];
+ char *attr_name;
+ u32 index;
+ int err;
+
+ err = get_sensor_index_attr(node_name, &index, attr_suffix);
+ if (err) {
+ dev_err(dev, "Sensor device node name '%s' is invalid\n",
+ node_name);
+ return err;
+ }
+
+ if (!strcmp(attr_suffix, DT_FAULT_ATTR_SUFFIX)) {
+ attr_name = "fault";
+ } else if (!strcmp(attr_suffix, DT_DATA_ATTR_SUFFIX)) {
+ attr_name = "input";
+ } else if (!strcmp(attr_suffix, DT_THRESHOLD_ATTR_SUFFIX)) {
+ if (type == AMBIENT_TEMP)
+ attr_name = "max";
+ else if (type == FAN)
+ attr_name = "min";
+ else
+ return -ENOENT;
+ } else {
+ return -ENOENT;
+ }
+
+ snprintf(hwmon_attr_name, MAX_ATTR_LEN, "%s%d_%s",
+ sensor_groups[type].name, index, attr_name);
+ return 0;
+}
+
+static int __init 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;
+
+ opal = of_find_node_by_path("/ibm,opal/sensors");
+ if (!opal) {
+ dev_err(&pdev->dev, "Opal node 'sensors' not found\n");
+ return -ENODEV;
+ }
+
+ for_each_child_of_node(opal, np) {
+ if (np->name == NULL)
+ continue;
+
+ for (type = 0; type < MAX_SENSOR_TYPE; type++)
+ if (of_device_is_compatible(np,
+ sensor_groups[type].compatible)) {
+ sensor_groups[type].attr_count++;
+ break;
+ }
+ }
+
+ of_node_put(opal);
+
+ for (type = 0; type < MAX_SENSOR_TYPE; type++) {
+ sensor_groups[type].group.attrs = devm_kzalloc(&pdev->dev,
+ sizeof(struct attribute *) *
+ (sensor_groups[type].attr_count + 1),
+ 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;
+}
+
+/*
+ * 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 __init 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;
+ const __be32 *sensor_id;
+ enum sensors type;
+ u32 count = 0;
+ int err = 0;
+
+ opal = of_find_node_by_path("/ibm,opal/sensors");
+ sdata = devm_kzalloc(&pdev->dev, pdata->sensors_count * sizeof(*sdata),
+ GFP_KERNEL);
+ if (!sdata) {
+ err = -ENOMEM;
+ goto exit_put_node;
+ }
+
+ for_each_child_of_node(opal, np) {
+ if (np->name == NULL)
+ continue;
+
+ for (type = 0; type < MAX_SENSOR_TYPE; type++)
+ if (of_device_is_compatible(np,
+ sensor_groups[type].compatible))
+ break;
+
+ if (type == MAX_SENSOR_TYPE)
+ continue;
+
+ sensor_id = of_get_property(np, "sensor-id", NULL);
+ if (!sensor_id) {
+ dev_info(&pdev->dev,
+ "'sensor-id' missing in the node '%s'\n",
+ np->name);
+ continue;
+ }
+
+ sdata[count].id = be32_to_cpup(sensor_id);
+ sdata[count].type = type;
+ err = create_hwmon_attr_name(&pdev->dev, type, np->name,
+ sdata[count].name);
+ if (err)
+ goto exit_put_node;
+
+ sysfs_attr_init(&sdata[count].dev_attr.attr);
+ sdata[count].dev_attr.attr.name = sdata[count].name;
+ sdata[count].dev_attr.attr.mode = S_IRUGO;
+ sdata[count].dev_attr.show = show_sensor;
+
+ pgroups[type]->attrs[sensor_groups[type].attr_count++] =
+ &sdata[count++].dev_attr.attr;
+ }
+
+exit_put_node:
+ of_node_put(opal);
+ return err;
+}
+
+static int __init 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;
+ 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 struct platform_driver ibmpowernv_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = DRVNAME,
+ },
+};
+
+static int __init ibmpowernv_init(void)
+{
+ int err;
+
+ pdevice = platform_device_alloc(DRVNAME, 0);
+ if (!pdevice) {
+ pr_err("Device allocation failed\n");
+ err = -ENOMEM;
+ goto exit;
+ }
+
+ err = platform_device_add(pdevice);
+ if (err) {
+ pr_err("Device addition failed (%d)\n", err);
+ goto exit_device_put;
+ }
+
+ err = platform_driver_probe(&ibmpowernv_driver, ibmpowernv_probe);
+ if (err) {
+ pr_err("Platfrom driver probe failed\n");
+ goto exit_device_del;
+ }
+
+ return 0;
+
+exit_device_del:
+ platform_device_del(pdevice);
+exit_device_put:
+ platform_device_put(pdevice);
+exit:
+ return err;
+}
+
+static void __exit ibmpowernv_exit(void)
+{
+ platform_driver_unregister(&ibmpowernv_driver);
+ platform_device_unregister(pdevice);
+}
+
+MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>");
+MODULE_DESCRIPTION("IBM POWERNV platform sensors");
+MODULE_LICENSE("GPL");
+
+module_init(ibmpowernv_init);
+module_exit(ibmpowernv_exit);
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