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path: root/drivers/hwmon/wm8350-hwmon.c
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Diffstat (limited to 'drivers/hwmon/wm8350-hwmon.c')
-rw-r--r--drivers/hwmon/wm8350-hwmon.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/drivers/hwmon/wm8350-hwmon.c b/drivers/hwmon/wm8350-hwmon.c
new file mode 100644
index 000000000..31af438ff
--- /dev/null
+++ b/drivers/hwmon/wm8350-hwmon.c
@@ -0,0 +1,104 @@
+/*
+ * drivers/hwmon/wm8350-hwmon.c - Wolfson Microelectronics WM8350 PMIC
+ * hardware monitoring features.
+ *
+ * Copyright (C) 2009 Wolfson Microelectronics plc
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License v2 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.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+
+#include <linux/mfd/wm8350/core.h>
+#include <linux/mfd/wm8350/comparator.h>
+
+static const char * const input_names[] = {
+ [WM8350_AUXADC_USB] = "USB",
+ [WM8350_AUXADC_LINE] = "Line",
+ [WM8350_AUXADC_BATT] = "Battery",
+};
+
+static ssize_t show_voltage(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct wm8350 *wm8350 = dev_get_drvdata(dev);
+ int channel = to_sensor_dev_attr(attr)->index;
+ int val;
+
+ val = wm8350_read_auxadc(wm8350, channel, 0, 0) * WM8350_AUX_COEFF;
+ val = DIV_ROUND_CLOSEST(val, 1000);
+
+ return sprintf(buf, "%d\n", val);
+}
+
+static ssize_t show_label(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int channel = to_sensor_dev_attr(attr)->index;
+
+ return sprintf(buf, "%s\n", input_names[channel]);
+}
+
+#define WM8350_NAMED_VOLTAGE(id, name) \
+ static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage,\
+ NULL, name); \
+ static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \
+ NULL, name)
+
+WM8350_NAMED_VOLTAGE(0, WM8350_AUXADC_USB);
+WM8350_NAMED_VOLTAGE(1, WM8350_AUXADC_BATT);
+WM8350_NAMED_VOLTAGE(2, WM8350_AUXADC_LINE);
+
+static struct attribute *wm8350_attrs[] = {
+ &sensor_dev_attr_in0_input.dev_attr.attr,
+ &sensor_dev_attr_in0_label.dev_attr.attr,
+ &sensor_dev_attr_in1_input.dev_attr.attr,
+ &sensor_dev_attr_in1_label.dev_attr.attr,
+ &sensor_dev_attr_in2_input.dev_attr.attr,
+ &sensor_dev_attr_in2_label.dev_attr.attr,
+
+ NULL,
+};
+
+ATTRIBUTE_GROUPS(wm8350);
+
+static int wm8350_hwmon_probe(struct platform_device *pdev)
+{
+ struct wm8350 *wm8350 = platform_get_drvdata(pdev);
+ struct device *hwmon_dev;
+
+ hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, "wm8350",
+ wm8350,
+ wm8350_groups);
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static struct platform_driver wm8350_hwmon_driver = {
+ .probe = wm8350_hwmon_probe,
+ .driver = {
+ .name = "wm8350-hwmon",
+ },
+};
+
+module_platform_driver(wm8350_hwmon_driver);
+
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_DESCRIPTION("WM8350 Hardware Monitoring");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:wm8350-hwmon");