261 строка
7.1 KiB
C
261 строка
7.1 KiB
C
/*
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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.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 regmap *reg;
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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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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 = regmap_read(data->reg, 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 = regmap_read(data->reg, 0, &value_lo);
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if (err)
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return err;
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err = regmap_read(data->reg, 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 umode_t vexpress_hwmon_attr_is_visible(struct kobject *kobj,
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struct attribute *attr, int index)
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{
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struct device *dev = kobj_to_dev(kobj);
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struct device_attribute *dev_attr = container_of(attr,
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struct device_attribute, attr);
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if (dev_attr->show == vexpress_hwmon_label_show &&
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!of_get_property(dev->of_node, "label", NULL))
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return 0;
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return attr->mode;
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}
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struct vexpress_hwmon_type {
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const char *name;
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const struct attribute_group **attr_groups;
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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 struct attribute *vexpress_hwmon_attrs_volt[] = {
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&dev_attr_in1_label.attr,
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&sensor_dev_attr_in1_input.dev_attr.attr,
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NULL
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};
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static struct attribute_group vexpress_hwmon_group_volt = {
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.is_visible = vexpress_hwmon_attr_is_visible,
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.attrs = vexpress_hwmon_attrs_volt,
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};
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static struct vexpress_hwmon_type vexpress_hwmon_volt = {
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.name = "vexpress_volt",
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.attr_groups = (const struct attribute_group *[]) {
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&vexpress_hwmon_group_volt,
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NULL,
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},
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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 struct attribute *vexpress_hwmon_attrs_amp[] = {
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&dev_attr_curr1_label.attr,
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&sensor_dev_attr_curr1_input.dev_attr.attr,
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NULL
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};
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static struct attribute_group vexpress_hwmon_group_amp = {
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.is_visible = vexpress_hwmon_attr_is_visible,
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.attrs = vexpress_hwmon_attrs_amp,
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};
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static struct vexpress_hwmon_type vexpress_hwmon_amp = {
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.name = "vexpress_amp",
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.attr_groups = (const struct attribute_group *[]) {
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&vexpress_hwmon_group_amp,
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NULL
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},
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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 struct attribute *vexpress_hwmon_attrs_temp[] = {
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&dev_attr_temp1_label.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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NULL
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};
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static struct attribute_group vexpress_hwmon_group_temp = {
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.is_visible = vexpress_hwmon_attr_is_visible,
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.attrs = vexpress_hwmon_attrs_temp,
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};
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static struct vexpress_hwmon_type vexpress_hwmon_temp = {
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.name = "vexpress_temp",
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.attr_groups = (const struct attribute_group *[]) {
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&vexpress_hwmon_group_temp,
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NULL
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},
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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 struct attribute *vexpress_hwmon_attrs_power[] = {
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&dev_attr_power1_label.attr,
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&sensor_dev_attr_power1_input.dev_attr.attr,
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NULL
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};
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static struct attribute_group vexpress_hwmon_group_power = {
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.is_visible = vexpress_hwmon_attr_is_visible,
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.attrs = vexpress_hwmon_attrs_power,
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};
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static struct vexpress_hwmon_type vexpress_hwmon_power = {
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.name = "vexpress_power",
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.attr_groups = (const struct attribute_group *[]) {
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&vexpress_hwmon_group_power,
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NULL
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},
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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 struct attribute *vexpress_hwmon_attrs_energy[] = {
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&dev_attr_energy1_label.attr,
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&sensor_dev_attr_energy1_input.dev_attr.attr,
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NULL
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};
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static struct attribute_group vexpress_hwmon_group_energy = {
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.is_visible = vexpress_hwmon_attr_is_visible,
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.attrs = vexpress_hwmon_attrs_energy,
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};
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static struct vexpress_hwmon_type vexpress_hwmon_energy = {
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.name = "vexpress_energy",
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.attr_groups = (const struct attribute_group *[]) {
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&vexpress_hwmon_group_energy,
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NULL
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},
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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_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_amp,
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}, {
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.compatible = "arm,vexpress-temp",
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.data = &vexpress_hwmon_temp,
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}, {
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.compatible = "arm,vexpress-power",
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.data = &vexpress_hwmon_power,
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}, {
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.compatible = "arm,vexpress-energy",
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.data = &vexpress_hwmon_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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const struct of_device_id *match;
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struct vexpress_hwmon_data *data;
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const struct vexpress_hwmon_type *type;
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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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type = match->data;
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data->reg = devm_regmap_init_vexpress_config(&pdev->dev);
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if (IS_ERR(data->reg))
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return PTR_ERR(data->reg);
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data->hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
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type->name, data, type->attr_groups);
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return PTR_ERR_OR_ZERO(data->hwmon_dev);
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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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.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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