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+/*
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+ * drivers/hwmon/wm831x-hwmon.c - Wolfson Microelectronics WM831x PMIC
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+ * hardware monitoring features.
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+ *
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+ * Copyright (C) 2009 Wolfson Microelectronics plc
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License v2 as published by the
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+ * Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful, but WITHOUT
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+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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+ * more details.
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+ *
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+ * You should have received a copy of the GNU General Public License along with
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+ * this program; if not, write to the Free Software Foundation, Inc.,
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+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/platform_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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+
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+#include <linux/mfd/wm831x/core.h>
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+#include <linux/mfd/wm831x/auxadc.h>
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+
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+struct wm831x_hwmon {
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+ struct wm831x *wm831x;
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+ struct device *classdev;
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+};
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+
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+static ssize_t show_name(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ return sprintf(buf, "wm831x\n");
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+}
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+
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+static const char *input_names[] = {
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+ [WM831X_AUX_SYSVDD] = "SYSVDD",
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+ [WM831X_AUX_USB] = "USB",
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+ [WM831X_AUX_BKUP_BATT] = "Backup battery",
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+ [WM831X_AUX_BATT] = "Battery",
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+ [WM831X_AUX_WALL] = "WALL",
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+ [WM831X_AUX_CHIP_TEMP] = "PMIC",
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+ [WM831X_AUX_BATT_TEMP] = "Battery",
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+};
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+
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+
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+static ssize_t show_voltage(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ struct wm831x_hwmon *hwmon = dev_get_drvdata(dev);
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+ int channel = to_sensor_dev_attr(attr)->index;
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+ int ret;
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+
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+ ret = wm831x_auxadc_read_uv(hwmon->wm831x, channel);
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+ if (ret < 0)
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+ return ret;
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+
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+ return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret, 1000));
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+}
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+
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+static ssize_t show_chip_temp(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ struct wm831x_hwmon *hwmon = dev_get_drvdata(dev);
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+ int channel = to_sensor_dev_attr(attr)->index;
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+ int ret;
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+
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+ ret = wm831x_auxadc_read(hwmon->wm831x, channel);
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+ if (ret < 0)
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+ return ret;
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+
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+ /* Degrees celsius = (512.18-ret) / 1.0983 */
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+ ret = 512180 - (ret * 1000);
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+ ret = DIV_ROUND_CLOSEST(ret * 10000, 10983);
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+
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+ return sprintf(buf, "%d\n", ret);
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+}
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+
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+static ssize_t show_label(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ int channel = to_sensor_dev_attr(attr)->index;
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+
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+ return sprintf(buf, "%s\n", input_names[channel]);
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+}
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+
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+#define WM831X_VOLTAGE(id, name) \
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+ static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage, \
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+ NULL, name)
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+
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+#define WM831X_NAMED_VOLTAGE(id, name) \
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+ WM831X_VOLTAGE(id, name); \
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+ static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \
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+ NULL, name)
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+
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+static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
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+
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+WM831X_VOLTAGE(0, WM831X_AUX_AUX1);
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+WM831X_VOLTAGE(1, WM831X_AUX_AUX2);
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+WM831X_VOLTAGE(2, WM831X_AUX_AUX3);
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+WM831X_VOLTAGE(3, WM831X_AUX_AUX4);
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+
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+WM831X_NAMED_VOLTAGE(4, WM831X_AUX_SYSVDD);
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+WM831X_NAMED_VOLTAGE(5, WM831X_AUX_USB);
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+WM831X_NAMED_VOLTAGE(6, WM831X_AUX_BATT);
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+WM831X_NAMED_VOLTAGE(7, WM831X_AUX_WALL);
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+WM831X_NAMED_VOLTAGE(8, WM831X_AUX_BKUP_BATT);
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+
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+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_chip_temp, NULL,
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+ WM831X_AUX_CHIP_TEMP);
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+static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL,
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+ WM831X_AUX_CHIP_TEMP);
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+/* Report as a voltage since conversion depends on external components
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+ * and that's what the ABI wants. */
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+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_voltage, NULL,
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+ WM831X_AUX_BATT_TEMP);
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+static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
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+ WM831X_AUX_BATT_TEMP);
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+
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+static struct attribute *wm831x_attributes[] = {
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+ &dev_attr_name.attr,
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+
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+ &sensor_dev_attr_in0_input.dev_attr.attr,
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+ &sensor_dev_attr_in1_input.dev_attr.attr,
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+ &sensor_dev_attr_in2_input.dev_attr.attr,
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+ &sensor_dev_attr_in3_input.dev_attr.attr,
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+
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+ &sensor_dev_attr_in4_input.dev_attr.attr,
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+ &sensor_dev_attr_in4_label.dev_attr.attr,
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+ &sensor_dev_attr_in5_input.dev_attr.attr,
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+ &sensor_dev_attr_in5_label.dev_attr.attr,
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+ &sensor_dev_attr_in6_input.dev_attr.attr,
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+ &sensor_dev_attr_in6_label.dev_attr.attr,
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+ &sensor_dev_attr_in7_input.dev_attr.attr,
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+ &sensor_dev_attr_in7_label.dev_attr.attr,
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+ &sensor_dev_attr_in8_input.dev_attr.attr,
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+ &sensor_dev_attr_in8_label.dev_attr.attr,
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+
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+ &sensor_dev_attr_temp1_input.dev_attr.attr,
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+ &sensor_dev_attr_temp1_label.dev_attr.attr,
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+ &sensor_dev_attr_temp2_input.dev_attr.attr,
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+ &sensor_dev_attr_temp2_label.dev_attr.attr,
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+
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+ NULL
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+};
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+
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+static const struct attribute_group wm831x_attr_group = {
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+ .attrs = wm831x_attributes,
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+};
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+
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+static int __devinit wm831x_hwmon_probe(struct platform_device *pdev)
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+{
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+ struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
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+ struct wm831x_hwmon *hwmon;
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+ int ret;
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+
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+ hwmon = kzalloc(sizeof(struct wm831x_hwmon), GFP_KERNEL);
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+ if (!hwmon)
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+ return -ENOMEM;
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+
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+ hwmon->wm831x = wm831x;
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+
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+ ret = sysfs_create_group(&pdev->dev.kobj, &wm831x_attr_group);
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+ if (ret)
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+ goto err;
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+
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+ hwmon->classdev = hwmon_device_register(&pdev->dev);
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+ if (IS_ERR(hwmon->classdev)) {
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+ ret = PTR_ERR(hwmon->classdev);
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+ goto err_sysfs;
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+ }
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+
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+ platform_set_drvdata(pdev, hwmon);
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+
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+ return 0;
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+
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+err_sysfs:
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+ sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group);
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+err:
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+ kfree(hwmon);
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+ return ret;
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+}
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+
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+static int __devexit wm831x_hwmon_remove(struct platform_device *pdev)
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+{
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+ struct wm831x_hwmon *hwmon = platform_get_drvdata(pdev);
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+
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+ hwmon_device_unregister(hwmon->classdev);
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+ sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group);
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+ platform_set_drvdata(pdev, NULL);
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+ kfree(hwmon);
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+
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+ return 0;
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+}
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+
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+static struct platform_driver wm831x_hwmon_driver = {
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+ .probe = wm831x_hwmon_probe,
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+ .remove = __devexit_p(wm831x_hwmon_remove),
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+ .driver = {
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+ .name = "wm831x-hwmon",
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+ .owner = THIS_MODULE,
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+ },
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+};
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+
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+static int __init wm831x_hwmon_init(void)
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+{
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+ return platform_driver_register(&wm831x_hwmon_driver);
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+}
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+module_init(wm831x_hwmon_init);
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+
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+static void __exit wm831x_hwmon_exit(void)
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+{
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+ platform_driver_unregister(&wm831x_hwmon_driver);
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+}
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+module_exit(wm831x_hwmon_exit);
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+
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+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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+MODULE_DESCRIPTION("WM831x Hardware Monitoring");
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+MODULE_LICENSE("GPL");
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+MODULE_ALIAS("platform:wm831x-hwmon");
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