diff options
Diffstat (limited to 'drivers/hwmon/vexpress.c')
| -rw-r--r-- | drivers/hwmon/vexpress.c | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/drivers/hwmon/vexpress.c b/drivers/hwmon/vexpress.c new file mode 100644 index 00000000000..59fd1268e58 --- /dev/null +++ b/drivers/hwmon/vexpress.c @@ -0,0 +1,229 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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. + * + * 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_device.h> +#include <linux/platform_device.h> +#include <linux/vexpress.h> + +struct vexpress_hwmon_data { + struct device *hwmon_dev; + struct vexpress_config_func *func; +}; + +static ssize_t vexpress_hwmon_name_show(struct device *dev, + struct device_attribute *dev_attr, char *buffer) +{ + const char *compatible = of_get_property(dev->of_node, "compatible", + NULL); + + return sprintf(buffer, "%s\n", compatible); +} + +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); + + if (!label) + return -ENOENT; + + return snprintf(buffer, PAGE_SIZE, "%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 = vexpress_config_read(data->func, 0, &value); + if (err) + return err; + + return snprintf(buffer, PAGE_SIZE, "%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 = vexpress_config_read(data->func, 0, &value_lo); + if (err) + return err; + + err = vexpress_config_read(data->func, 1, &value_hi); + if (err) + return err; + + return snprintf(buffer, PAGE_SIZE, "%llu\n", + div_u64(((u64)value_hi << 32) | value_lo, + to_sensor_dev_attr(dev_attr)->index)); +} + +static DEVICE_ATTR(name, S_IRUGO, vexpress_hwmon_name_show, NULL); + +#define VEXPRESS_HWMON_ATTRS(_name, _label_attr, _input_attr) \ +struct attribute *vexpress_hwmon_attrs_##_name[] = { \ + &dev_attr_name.attr, \ + &dev_attr_##_label_attr.attr, \ + &sensor_dev_attr_##_input_attr.dev_attr.attr, \ + NULL \ +} + +#if !defined(CONFIG_REGULATOR_VEXPRESS) +static DEVICE_ATTR(in1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); +static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, vexpress_hwmon_u32_show, + NULL, 1000); +static VEXPRESS_HWMON_ATTRS(volt, in1_label, in1_input); +static struct attribute_group vexpress_hwmon_group_volt = { + .attrs = vexpress_hwmon_attrs_volt, +}; +#endif + +static DEVICE_ATTR(curr1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); +static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, vexpress_hwmon_u32_show, + NULL, 1000); +static VEXPRESS_HWMON_ATTRS(amp, curr1_label, curr1_input); +static struct attribute_group vexpress_hwmon_group_amp = { + .attrs = vexpress_hwmon_attrs_amp, +}; + +static DEVICE_ATTR(temp1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, vexpress_hwmon_u32_show, + NULL, 1000); +static VEXPRESS_HWMON_ATTRS(temp, temp1_label, temp1_input); +static struct attribute_group vexpress_hwmon_group_temp = { + .attrs = vexpress_hwmon_attrs_temp, +}; + +static DEVICE_ATTR(power1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); +static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, vexpress_hwmon_u32_show, + NULL, 1); +static VEXPRESS_HWMON_ATTRS(power, power1_label, power1_input); +static struct attribute_group vexpress_hwmon_group_power = { + .attrs = vexpress_hwmon_attrs_power, +}; + +static DEVICE_ATTR(energy1_label, S_IRUGO, vexpress_hwmon_label_show, NULL); +static SENSOR_DEVICE_ATTR(energy1_input, S_IRUGO, vexpress_hwmon_u64_show, + NULL, 1); +static VEXPRESS_HWMON_ATTRS(energy, energy1_label, energy1_input); +static struct attribute_group vexpress_hwmon_group_energy = { + .attrs = vexpress_hwmon_attrs_energy, +}; + +static struct of_device_id vexpress_hwmon_of_match[] = { +#if !defined(CONFIG_REGULATOR_VEXPRESS) + { + .compatible = "arm,vexpress-volt", + .data = &vexpress_hwmon_group_volt, + }, +#endif + { + .compatible = "arm,vexpress-amp", + .data = &vexpress_hwmon_group_amp, + }, { + .compatible = "arm,vexpress-temp", + .data = &vexpress_hwmon_group_temp, + }, { + .compatible = "arm,vexpress-power", + .data = &vexpress_hwmon_group_power, + }, { + .compatible = "arm,vexpress-energy", + .data = &vexpress_hwmon_group_energy, + }, + {} +}; +MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match); + +static int vexpress_hwmon_probe(struct platform_device *pdev) +{ + int err; + const struct of_device_id *match; + struct vexpress_hwmon_data *data; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + platform_set_drvdata(pdev, data); + + match = of_match_device(vexpress_hwmon_of_match, &pdev->dev); + if (!match) + return -ENODEV; + + data->func = vexpress_config_func_get_by_dev(&pdev->dev); + if (!data->func) + return -ENODEV; + + err = sysfs_create_group(&pdev->dev.kobj, match->data); + if (err) + goto error; + + data->hwmon_dev = hwmon_device_register(&pdev->dev); + if (IS_ERR(data->hwmon_dev)) { + err = PTR_ERR(data->hwmon_dev); + goto error; + } + + return 0; + +error: + sysfs_remove_group(&pdev->dev.kobj, match->data); + vexpress_config_func_put(data->func); + return err; +} + +static int __devexit vexpress_hwmon_remove(struct platform_device *pdev) +{ + struct vexpress_hwmon_data *data = platform_get_drvdata(pdev); + const struct of_device_id *match; + + hwmon_device_unregister(data->hwmon_dev); + + match = of_match_device(vexpress_hwmon_of_match, &pdev->dev); + sysfs_remove_group(&pdev->dev.kobj, match->data); + + vexpress_config_func_put(data->func); + + return 0; +} + +static struct platform_driver vexpress_hwmon_driver = { + .probe = vexpress_hwmon_probe, + .remove = __devexit_p(vexpress_hwmon_remove), + .driver = { + .name = DRVNAME, + .owner = THIS_MODULE, + .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"); |