Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / hwmon / wm8350-hwmon.c

diff --git a/kernel/drivers/hwmon/wm8350-hwmon.c b/kernel/drivers/hwmon/wm8350-hwmon.c
new file mode 100644 (file)
index 0000000..31af438
--- /dev/null
+++ b/kernel/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");