Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / hwmon / twl4030-madc-hwmon.c

diff --git a/kernel/drivers/hwmon/twl4030-madc-hwmon.c b/kernel/drivers/hwmon/twl4030-madc-hwmon.c
new file mode 100644 (file)
index 0000000..b5caf7f
--- /dev/null
+++ b/kernel/drivers/hwmon/twl4030-madc-hwmon.c
@@ -0,0 +1,118 @@
+/*
+ *
+ * TWL4030 MADC Hwmon driver-This driver monitors the real time
+ * conversion of analog signals like battery temperature,
+ * battery type, battery level etc. User can ask for the conversion on a
+ * particular channel using the sysfs nodes.
+ *
+ * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
+ * J Keerthy <j-keerthy@ti.com>
+ *
+ * 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.
+ *
+ * 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 St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/i2c/twl.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/i2c/twl4030-madc.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/stddef.h>
+#include <linux/sysfs.h>
+#include <linux/err.h>
+#include <linux/types.h>
+
+/*
+ * sysfs hook function
+ */
+static ssize_t madc_read(struct device *dev,
+                        struct device_attribute *devattr, char *buf)
+{
+       struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+       struct twl4030_madc_request req = {
+               .channels = 1 << attr->index,
+               .method = TWL4030_MADC_SW2,
+               .type = TWL4030_MADC_WAIT,
+       };
+       long val;
+
+       val = twl4030_madc_conversion(&req);
+       if (val < 0)
+               return val;
+
+       return sprintf(buf, "%d\n", req.rbuf[attr->index]);
+}
+
+/* sysfs nodes to read individual channels from user side */
+static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, madc_read, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, madc_read, NULL, 1);
+static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, madc_read, NULL, 2);
+static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, madc_read, NULL, 3);
+static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, madc_read, NULL, 4);
+static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, madc_read, NULL, 5);
+static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, madc_read, NULL, 6);
+static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, madc_read, NULL, 7);
+static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, madc_read, NULL, 8);
+static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, madc_read, NULL, 9);
+static SENSOR_DEVICE_ATTR(curr10_input, S_IRUGO, madc_read, NULL, 10);
+static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, madc_read, NULL, 11);
+static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, madc_read, NULL, 12);
+static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, madc_read, NULL, 15);
+
+static struct attribute *twl4030_madc_attrs[] = {
+       &sensor_dev_attr_in0_input.dev_attr.attr,
+       &sensor_dev_attr_temp1_input.dev_attr.attr,
+       &sensor_dev_attr_in2_input.dev_attr.attr,
+       &sensor_dev_attr_in3_input.dev_attr.attr,
+       &sensor_dev_attr_in4_input.dev_attr.attr,
+       &sensor_dev_attr_in5_input.dev_attr.attr,
+       &sensor_dev_attr_in6_input.dev_attr.attr,
+       &sensor_dev_attr_in7_input.dev_attr.attr,
+       &sensor_dev_attr_in8_input.dev_attr.attr,
+       &sensor_dev_attr_in9_input.dev_attr.attr,
+       &sensor_dev_attr_curr10_input.dev_attr.attr,
+       &sensor_dev_attr_in11_input.dev_attr.attr,
+       &sensor_dev_attr_in12_input.dev_attr.attr,
+       &sensor_dev_attr_in15_input.dev_attr.attr,
+       NULL
+};
+ATTRIBUTE_GROUPS(twl4030_madc);
+
+static int twl4030_madc_hwmon_probe(struct platform_device *pdev)
+{
+       struct device *hwmon;
+
+       hwmon = devm_hwmon_device_register_with_groups(&pdev->dev,
+                                                      "twl4030_madc", NULL,
+                                                      twl4030_madc_groups);
+       return PTR_ERR_OR_ZERO(hwmon);
+}
+
+static struct platform_driver twl4030_madc_hwmon_driver = {
+       .probe = twl4030_madc_hwmon_probe,
+       .driver = {
+                  .name = "twl4030_madc_hwmon",
+                  },
+};
+
+module_platform_driver(twl4030_madc_hwmon_driver);
+
+MODULE_DESCRIPTION("TWL4030 ADC Hwmon driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("J Keerthy");
+MODULE_ALIAS("platform:twl4030_madc_hwmon");