hwmon: Versatile Express hwmon driver
hwmon framework driver for Versatile Express sensors, providing information about board level voltage (only when regulator driver is not configured), currents, temperature and power/energy usage. Labels for the values can be defined as DT properties. Signed-off-by: Pawel Moll <pawel.moll@arm.com> Acked-by: Guenter Roeck <linux@roeck-us.net>
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Pawel Moll
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48ed887724
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@ -0,0 +1,23 @@
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Versatile Express hwmon sensors
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-------------------------------
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Requires node properties:
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- "compatible" value : one of
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"arm,vexpress-volt"
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"arm,vexpress-amp"
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"arm,vexpress-temp"
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"arm,vexpress-power"
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"arm,vexpress-energy"
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- "arm,vexpress-sysreg,func" when controlled via vexpress-sysreg
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(see Documentation/devicetree/bindings/arm/vexpress-sysreg.txt
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for more details)
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Optional node properties:
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- label : string describing the monitored value
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Example:
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energy@0 {
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compatible = "arm,vexpress-energy";
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arm,vexpress-sysreg,func = <13 0>;
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label = "A15 Jcore";
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};
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Kernel driver vexpress
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======================
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Supported systems:
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* ARM Ltd. Versatile Express platform
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Prefix: 'vexpress'
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Datasheets:
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* "Hardware Description" sections of the Technical Reference Manuals
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for the Versatile Express boards:
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http://infocenter.arm.com/help/topic/com.arm.doc.subset.boards.express/index.html
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* Section "4.4.14. System Configuration registers" of the V2M-P1 TRM:
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http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0447-/index.html
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Author: Pawel Moll
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Description
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-----------
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Versatile Express platform (http://www.arm.com/versatileexpress/) is a
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reference & prototyping system for ARM Ltd. processors. It can be set up
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from a wide range of boards, each of them containing (apart of the main
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chip/FPGA) a number of microcontrollers responsible for platform
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configuration and control. Theses microcontrollers can also monitor the
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board and its environment by a number of internal and external sensors,
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providing information about power lines voltages and currents, board
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temperature and power usage. Some of them also calculate consumed energy
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and provide a cumulative use counter.
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The configuration devices are _not_ memory mapped and must be accessed
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via a custom interface, abstracted by the "vexpress_config" API.
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As these devices are non-discoverable, they must be described in a Device
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Tree passed to the kernel. Details of the DT binding for them can be found
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in Documentation/devicetree/bindings/hwmon/vexpress.txt.
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@ -1197,6 +1197,14 @@ config SENSORS_TWL4030_MADC
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This driver can also be built as a module. If so it will be called
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twl4030-madc-hwmon.
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config SENSORS_VEXPRESS
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tristate "Versatile Express"
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depends on VEXPRESS_CONFIG
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help
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This driver provides support for hardware sensors available on
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the ARM Ltd's Versatile Express platform. It can provide wide
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range of information like temperature, power, energy.
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config SENSORS_VIA_CPUTEMP
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tristate "VIA CPU temperature sensor"
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depends on X86
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@ -121,6 +121,7 @@ obj-$(CONFIG_SENSORS_TMP102) += tmp102.o
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obj-$(CONFIG_SENSORS_TMP401) += tmp401.o
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obj-$(CONFIG_SENSORS_TMP421) += tmp421.o
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obj-$(CONFIG_SENSORS_TWL4030_MADC)+= twl4030-madc-hwmon.o
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obj-$(CONFIG_SENSORS_VEXPRESS) += vexpress.o
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obj-$(CONFIG_SENSORS_VIA_CPUTEMP)+= via-cputemp.o
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obj-$(CONFIG_SENSORS_VIA686A) += via686a.o
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obj-$(CONFIG_SENSORS_VT1211) += vt1211.o
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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 version 2 as
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* published by the Free Software Foundation.
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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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* Copyright (C) 2012 ARM Limited
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*/
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#define DRVNAME "vexpress-hwmon"
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#define pr_fmt(fmt) DRVNAME ": " fmt
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/vexpress.h>
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struct vexpress_hwmon_data {
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struct device *hwmon_dev;
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struct vexpress_config_func *func;
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};
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static ssize_t vexpress_hwmon_name_show(struct device *dev,
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struct device_attribute *dev_attr, char *buffer)
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{
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const char *compatible = of_get_property(dev->of_node, "compatible",
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NULL);
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return sprintf(buffer, "%s\n", compatible);
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}
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static ssize_t vexpress_hwmon_label_show(struct device *dev,
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struct device_attribute *dev_attr, char *buffer)
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{
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const char *label = of_get_property(dev->of_node, "label", NULL);
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if (!label)
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return -ENOENT;
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return snprintf(buffer, PAGE_SIZE, "%s\n", label);
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}
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static ssize_t vexpress_hwmon_u32_show(struct device *dev,
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struct device_attribute *dev_attr, char *buffer)
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{
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struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
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int err;
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u32 value;
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err = vexpress_config_read(data->func, 0, &value);
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if (err)
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return err;
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return snprintf(buffer, PAGE_SIZE, "%u\n", value /
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to_sensor_dev_attr(dev_attr)->index);
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}
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static ssize_t vexpress_hwmon_u64_show(struct device *dev,
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struct device_attribute *dev_attr, char *buffer)
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{
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struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
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int err;
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u32 value_hi, value_lo;
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err = vexpress_config_read(data->func, 0, &value_lo);
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if (err)
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return err;
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err = vexpress_config_read(data->func, 1, &value_hi);
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if (err)
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return err;
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return snprintf(buffer, PAGE_SIZE, "%llu\n",
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div_u64(((u64)value_hi << 32) | value_lo,
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to_sensor_dev_attr(dev_attr)->index));
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}
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static DEVICE_ATTR(name, S_IRUGO, vexpress_hwmon_name_show, NULL);
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#define VEXPRESS_HWMON_ATTRS(_name, _label_attr, _input_attr) \
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struct attribute *vexpress_hwmon_attrs_##_name[] = { \
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&dev_attr_name.attr, \
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&dev_attr_##_label_attr.attr, \
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&sensor_dev_attr_##_input_attr.dev_attr.attr, \
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NULL \
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}
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#if !defined(CONFIG_REGULATOR_VEXPRESS)
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static DEVICE_ATTR(in1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
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static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, vexpress_hwmon_u32_show,
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NULL, 1000);
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static VEXPRESS_HWMON_ATTRS(volt, in1_label, in1_input);
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static struct attribute_group vexpress_hwmon_group_volt = {
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.attrs = vexpress_hwmon_attrs_volt,
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};
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#endif
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static DEVICE_ATTR(curr1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
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static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, vexpress_hwmon_u32_show,
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NULL, 1000);
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static VEXPRESS_HWMON_ATTRS(amp, curr1_label, curr1_input);
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static struct attribute_group vexpress_hwmon_group_amp = {
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.attrs = vexpress_hwmon_attrs_amp,
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};
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static DEVICE_ATTR(temp1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, vexpress_hwmon_u32_show,
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NULL, 1000);
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static VEXPRESS_HWMON_ATTRS(temp, temp1_label, temp1_input);
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static struct attribute_group vexpress_hwmon_group_temp = {
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.attrs = vexpress_hwmon_attrs_temp,
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};
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static DEVICE_ATTR(power1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
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static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, vexpress_hwmon_u32_show,
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NULL, 1);
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static VEXPRESS_HWMON_ATTRS(power, power1_label, power1_input);
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static struct attribute_group vexpress_hwmon_group_power = {
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.attrs = vexpress_hwmon_attrs_power,
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};
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static DEVICE_ATTR(energy1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
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static SENSOR_DEVICE_ATTR(energy1_input, S_IRUGO, vexpress_hwmon_u64_show,
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NULL, 1);
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static VEXPRESS_HWMON_ATTRS(energy, energy1_label, energy1_input);
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static struct attribute_group vexpress_hwmon_group_energy = {
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.attrs = vexpress_hwmon_attrs_energy,
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};
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static struct of_device_id vexpress_hwmon_of_match[] = {
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#if !defined(CONFIG_REGULATOR_VEXPRESS)
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{
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.compatible = "arm,vexpress-volt",
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.data = &vexpress_hwmon_group_volt,
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},
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#endif
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{
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.compatible = "arm,vexpress-amp",
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.data = &vexpress_hwmon_group_amp,
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}, {
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.compatible = "arm,vexpress-temp",
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.data = &vexpress_hwmon_group_temp,
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}, {
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.compatible = "arm,vexpress-power",
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.data = &vexpress_hwmon_group_power,
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}, {
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.compatible = "arm,vexpress-energy",
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.data = &vexpress_hwmon_group_energy,
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},
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{}
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};
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MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match);
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static int vexpress_hwmon_probe(struct platform_device *pdev)
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{
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int err;
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const struct of_device_id *match;
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struct vexpress_hwmon_data *data;
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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platform_set_drvdata(pdev, data);
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match = of_match_device(vexpress_hwmon_of_match, &pdev->dev);
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if (!match)
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return -ENODEV;
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data->func = vexpress_config_func_get_by_dev(&pdev->dev);
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if (!data->func)
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return -ENODEV;
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err = sysfs_create_group(&pdev->dev.kobj, match->data);
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if (err)
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goto error;
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data->hwmon_dev = hwmon_device_register(&pdev->dev);
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if (IS_ERR(data->hwmon_dev)) {
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err = PTR_ERR(data->hwmon_dev);
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goto error;
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}
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return 0;
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error:
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sysfs_remove_group(&pdev->dev.kobj, match->data);
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vexpress_config_func_put(data->func);
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return err;
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}
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static int __devexit vexpress_hwmon_remove(struct platform_device *pdev)
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{
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struct vexpress_hwmon_data *data = platform_get_drvdata(pdev);
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const struct of_device_id *match;
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hwmon_device_unregister(data->hwmon_dev);
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match = of_match_device(vexpress_hwmon_of_match, &pdev->dev);
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sysfs_remove_group(&pdev->dev.kobj, match->data);
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vexpress_config_func_put(data->func);
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return 0;
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}
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static struct platform_driver vexpress_hwmon_driver = {
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.probe = vexpress_hwmon_probe,
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.remove = __devexit_p(vexpress_hwmon_remove),
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.driver = {
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.name = DRVNAME,
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.owner = THIS_MODULE,
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.of_match_table = vexpress_hwmon_of_match,
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},
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};
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module_platform_driver(vexpress_hwmon_driver);
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MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
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MODULE_DESCRIPTION("Versatile Express hwmon sensors driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:vexpress-hwmon");
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