diff options
Diffstat (limited to 'drivers/hwmon/vexpress-hwmon.c')
| -rw-r--r-- | drivers/hwmon/vexpress-hwmon.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/drivers/hwmon/vexpress-hwmon.c b/drivers/hwmon/vexpress-hwmon.c new file mode 100644 index 000000000..2ac5fb96b --- /dev/null +++ b/drivers/hwmon/vexpress-hwmon.c @@ -0,0 +1,245 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * + * Copyright (C) 2012 ARM Limited + */ + +#define DRVNAME "vexpress-hwmon" +#define pr_fmt(fmt) DRVNAME ": " fmt + +#include <linux/device.h> +#include <linux/err.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/vexpress.h> + +struct vexpress_hwmon_data { + struct device *hwmon_dev; + struct regmap *reg; +}; + +static ssize_t vexpress_hwmon_label_show(struct device *dev, + struct device_attribute *dev_attr, char *buffer) +{ + const char *label = of_get_property(dev->of_node, "label", NULL); + + return sysfs_emit(buffer, "%s\n", label); +} + +static ssize_t vexpress_hwmon_u32_show(struct device *dev, + struct device_attribute *dev_attr, char *buffer) +{ + struct vexpress_hwmon_data *data = dev_get_drvdata(dev); + int err; + u32 value; + + err = regmap_read(data->reg, 0, &value); + if (err) + return err; + + return sysfs_emit(buffer, "%u\n", value / + to_sensor_dev_attr(dev_attr)->index); +} + +static ssize_t vexpress_hwmon_u64_show(struct device *dev, + struct device_attribute *dev_attr, char *buffer) +{ + struct vexpress_hwmon_data *data = dev_get_drvdata(dev); + int err; + u32 value_hi, value_lo; + + err = regmap_read(data->reg, 0, &value_lo); + if (err) + return err; + + err = regmap_read(data->reg, 1, &value_hi); + if (err) + return err; + + return sysfs_emit(buffer, "%llu\n", + div_u64(((u64)value_hi << 32) | value_lo, + to_sensor_dev_attr(dev_attr)->index)); +} + +static umode_t vexpress_hwmon_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int index) +{ + struct device *dev = kobj_to_dev(kobj); + struct device_attribute *dev_attr = container_of(attr, + struct device_attribute, attr); + + if (dev_attr->show == vexpress_hwmon_label_show && + !of_get_property(dev->of_node, "label", NULL)) + return 0; + + return attr->mode; +} + +struct vexpress_hwmon_type { + const char *name; + const struct attribute_group **attr_groups; +}; + +#if !defined(CONFIG_REGULATOR_VEXPRESS) +static DEVICE_ATTR(in1_label, 0444, vexpress_hwmon_label_show, NULL); +static SENSOR_DEVICE_ATTR_RO(in1_input, vexpress_hwmon_u32, 1000); +static struct attribute *vexpress_hwmon_attrs_volt[] = { + &dev_attr_in1_label.attr, + &sensor_dev_attr_in1_input.dev_attr.attr, + NULL +}; +static struct attribute_group vexpress_hwmon_group_volt = { + .is_visible = vexpress_hwmon_attr_is_visible, + .attrs = vexpress_hwmon_attrs_volt, +}; +static struct vexpress_hwmon_type vexpress_hwmon_volt = { + .name = "vexpress_volt", + .attr_groups = (const struct attribute_group *[]) { + &vexpress_hwmon_group_volt, + NULL, + }, +}; +#endif + +static DEVICE_ATTR(curr1_label, 0444, vexpress_hwmon_label_show, NULL); +static SENSOR_DEVICE_ATTR_RO(curr1_input, vexpress_hwmon_u32, 1000); +static struct attribute *vexpress_hwmon_attrs_amp[] = { + &dev_attr_curr1_label.attr, + &sensor_dev_attr_curr1_input.dev_attr.attr, + NULL +}; +static struct attribute_group vexpress_hwmon_group_amp = { + .is_visible = vexpress_hwmon_attr_is_visible, + .attrs = vexpress_hwmon_attrs_amp, +}; +static struct vexpress_hwmon_type vexpress_hwmon_amp = { + .name = "vexpress_amp", + .attr_groups = (const struct attribute_group *[]) { + &vexpress_hwmon_group_amp, + NULL + }, +}; + +static DEVICE_ATTR(temp1_label, 0444, vexpress_hwmon_label_show, NULL); +static SENSOR_DEVICE_ATTR_RO(temp1_input, vexpress_hwmon_u32, 1000); +static struct attribute *vexpress_hwmon_attrs_temp[] = { + &dev_attr_temp1_label.attr, + &sensor_dev_attr_temp1_input.dev_attr.attr, + NULL +}; +static struct attribute_group vexpress_hwmon_group_temp = { + .is_visible = vexpress_hwmon_attr_is_visible, + .attrs = vexpress_hwmon_attrs_temp, +}; +static struct vexpress_hwmon_type vexpress_hwmon_temp = { + .name = "vexpress_temp", + .attr_groups = (const struct attribute_group *[]) { + &vexpress_hwmon_group_temp, + NULL + }, +}; + +static DEVICE_ATTR(power1_label, 0444, vexpress_hwmon_label_show, NULL); +static SENSOR_DEVICE_ATTR_RO(power1_input, vexpress_hwmon_u32, 1); +static struct attribute *vexpress_hwmon_attrs_power[] = { + &dev_attr_power1_label.attr, + &sensor_dev_attr_power1_input.dev_attr.attr, + NULL +}; +static struct attribute_group vexpress_hwmon_group_power = { + .is_visible = vexpress_hwmon_attr_is_visible, + .attrs = vexpress_hwmon_attrs_power, +}; +static struct vexpress_hwmon_type vexpress_hwmon_power = { + .name = "vexpress_power", + .attr_groups = (const struct attribute_group *[]) { + &vexpress_hwmon_group_power, + NULL + }, +}; + +static DEVICE_ATTR(energy1_label, 0444, vexpress_hwmon_label_show, NULL); +static SENSOR_DEVICE_ATTR_RO(energy1_input, vexpress_hwmon_u64, 1); +static struct attribute *vexpress_hwmon_attrs_energy[] = { + &dev_attr_energy1_label.attr, + &sensor_dev_attr_energy1_input.dev_attr.attr, + NULL +}; +static struct attribute_group vexpress_hwmon_group_energy = { + .is_visible = vexpress_hwmon_attr_is_visible, + .attrs = vexpress_hwmon_attrs_energy, +}; +static struct vexpress_hwmon_type vexpress_hwmon_energy = { + .name = "vexpress_energy", + .attr_groups = (const struct attribute_group *[]) { + &vexpress_hwmon_group_energy, + NULL + }, +}; + +static const struct of_device_id vexpress_hwmon_of_match[] = { +#if !defined(CONFIG_REGULATOR_VEXPRESS) + { + .compatible = "arm,vexpress-volt", + .data = &vexpress_hwmon_volt, + }, +#endif + { + .compatible = "arm,vexpress-amp", + .data = &vexpress_hwmon_amp, + }, { + .compatible = "arm,vexpress-temp", + .data = &vexpress_hwmon_temp, + }, { + .compatible = "arm,vexpress-power", + .data = &vexpress_hwmon_power, + }, { + .compatible = "arm,vexpress-energy", + .data = &vexpress_hwmon_energy, + }, + {} +}; +MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match); + +static int vexpress_hwmon_probe(struct platform_device *pdev) +{ + struct vexpress_hwmon_data *data; + const struct vexpress_hwmon_type *type; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + platform_set_drvdata(pdev, data); + + type = of_device_get_match_data(&pdev->dev); + if (!type) + return -ENODEV; + + data->reg = devm_regmap_init_vexpress_config(&pdev->dev); + if (IS_ERR(data->reg)) + return PTR_ERR(data->reg); + + data->hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, + type->name, data, type->attr_groups); + + return PTR_ERR_OR_ZERO(data->hwmon_dev); +} + +static struct platform_driver vexpress_hwmon_driver = { + .probe = vexpress_hwmon_probe, + .driver = { + .name = DRVNAME, + .of_match_table = vexpress_hwmon_of_match, + }, +}; + +module_platform_driver(vexpress_hwmon_driver); + +MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>"); +MODULE_DESCRIPTION("Versatile Express hwmon sensors driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:vexpress-hwmon"); |