Date:	Wed, 4 May 2011 16:06:55 +0530
From:	Ashish Jangam <Ashish.Jangam@...tcummins.com>
To:	Guenter Roeck <guenter.roeck@...csson.com>
CC:	Randy Dunlap <randy.dunlap@...cle.com>,
	Dajun Chen <Dajun.Chen@...semi.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>
Subject: [PATCHv2 -next] HWMON: HWMON module of DA9052 PMIC driver

Hi,

HWMON Driver for Dialog Semiconductor DA9052 PMICs.

Changes made since last submission:
. Removed battery temperature parameter as it involves logarithm and floating point operation.

Signed-off-by: David Dajun Chen <dchen@...semi.com>
---

diff -Naur linux-next-20110421.orig/Documentation/hwmon/da9052 linux-next-20110421/Documentation/hwmon/da9052
--- linux-next-20110421.orig/Documentation/hwmon/da9052	1970-01-01 05:00:00.000000000 +0500
+++ linux-next-20110421/Documentation/hwmon/da9052	2011-05-04 14:11:56.000000000 +0500
@@ -0,0 +1,61 @@
+Kernel driver da9052-hwmon
+==========================
+
+Supported chips:
+  * Dialog Semiconductors DA9052 PMICs
+    Prefix: 'da9052'
+    Datasheet: Kindly visit www.dialog-semiconductor.com and request for the
+               official datasheet.
+
+Authors: David Dajun Chen <dchen@...semi.com>
+
+Description
+-----------
+
+The DA9052 provides an Analogue to Digital Converter (ADC) with 10 bits
+resolution and track and hold circuitry combined with an analogue input
+multiplexer. The analogue input multiplexer will allow conversion of up to 10
+different inputs. The track and hold circuit ensures stable input voltages at
+the input of the ADC during the conversion.
+
+The ADC is used to measure the following inputs:
+Channel 0: VDDOUT - measurement of the system voltage
+Channel 1: ICH - internal battery charger current measurement
+Channel 2: TBAT - output from the battery NTC
+Channel 3: VBAT - measurement of the battery voltage
+Channel 4: ADC_IN4 - high impedance input (0 - 2.5V)
+Channel 5: ADC_IN5 - high impedance input (0 - 2.5V)
+Channel 6: ADC_IN6 - high impedance input (0 - 2.5V)
+Channel 7: XY - TSI interface to measure the X and Y voltage of the touch
+screen resistive potentiometers
+Channel 8: Internal Tjunc. - sense (internal temp. sensor)
+Channel 9: VBBAT - measurement of the backup battery voltage
+
+By using sysfs attributes we can measure the system voltage VDDOUT, the battery
+charging current ICH, battery temperature TBAT, battery junction temperature
+TJUNC, battery voltage VBAT and the back up battery voltage VBBAT.
+
+Voltage Monitoring
+------------------
+
+Voltages are sampled by a 10 bit ADC.  Voltages in millivolts are 1.465
+times the ADC value.
+
+Temperature Monitoring
+----------------------
+
+Temperatures are sampled by a 10 bit ADC.  Junction and battery temperatures
+are monitored by the ADC channels.
+
+The junction temperature is calculated:
+	Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
+The junction temperature attribute is supported by the driver.
+
+The battery temperature is calculated:
+	Degree Celcius = 1 / (t1 + 1/298)- 273
+where t1 = (1/B)* ln(( ADCval * 2.5)/(R25*ITBAT*255))
+Default values of R25, B, ITBAT are 10e3, 3380 and 50e-6 respectively.
+As the battery temperature computation depends on floating point
+computation and taking natural log the battery temperature attribute is
+not supported by the driver.
+
diff -Naur linux-next-20110421.orig/drivers/hwmon/da9052-hwmon.c linux-next-20110421/drivers/hwmon/da9052-hwmon.c
--- linux-next-20110421.orig/drivers/hwmon/da9052-hwmon.c	1970-01-01 05:00:00.000000000 +0500
+++ linux-next-20110421/drivers/hwmon/da9052-hwmon.c	2011-05-04 14:12:13.000000000 +0500
@@ -0,0 +1,317 @@
+/*
+ * HWMON Driver for Dialog DA9052
+ *
+ * Copyright(c) 2011 Dialog Semiconductor Ltd.
+ *
+ * Author: David Dajun Chen <dchen@...semi.com>
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/hwmon.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/platform_device.h>
+
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/reg.h>
+
+struct da9052_hwmon {
+	struct da9052	*da9052;
+	struct device	*class_device;
+	struct mutex	hwmon_lock;
+};
+static const char * const input_names[] = {
+	[DA9052_ADC_VDDOUT]	=	"VDDOUT",
+	[DA9052_ADC_ICH]	=	"CHARGING CURRENT",
+	[DA9052_ADC_VBAT]	=	"BATTERY VOLTAGE",
+	[DA9052_ADC_IN4]	=	"ADC IN4",
+	[DA9052_ADC_IN5]	=	"ADC IN5",
+	[DA9052_ADC_IN6]	=	"ADC IN6",
+	[DA9052_ADC_TJUNC]	=	"BATTERY JUNCTION TEMP",
+	[DA9052_ADC_VBBAT]	=	"BACK-UP BATTERY VOLTAGE",
+};
+
+static int da9052_enable_vddout_channel(struct da9052 *da9052)
+{
+	int ret;
+
+	ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG);
+	if (ret < 0)
+		return ret;
+
+	ret |= DA9052_ADCCONT_AUTOVDDEN;
+	return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret);
+}
+
+static int da9052_disable_vddout_channel(struct da9052 *da9052)
+{
+	int ret;
+
+	ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG);
+	if (ret < 0)
+		return ret;
+
+	ret &= ~DA9052_ADCCONT_AUTOVDDEN;
+	return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret);
+
+}
+
+static ssize_t da9052_read_vddout(struct device *dev,
+	struct device_attribute *devattr, char *buf)
+{
+	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
+	int ret;
+
+	mutex_lock(&hwmon->hwmon_lock);
+
+	ret = da9052_enable_vddout_channel(hwmon->da9052);
+	if (ret < 0)
+		goto hwmon_err;
+
+	ret = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG);
+	if (ret < 0)
+		pr_err("failed to read VDD_RES_REG\n");
+
+	ret = da9052_disable_vddout_channel(hwmon->da9052);
+	if (ret < 0)
+		goto hwmon_err;
+
+	mutex_unlock(&hwmon->hwmon_lock);
+	return sprintf(buf, "%d\n", ret);
+hwmon_err:
+	mutex_unlock(&hwmon->hwmon_lock);
+	return ret;
+}
+
+static ssize_t da9052_read_ich(struct device *dev,
+	struct device_attribute *devattr, char *buf)
+{
+	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
+	int ret;
+
+	ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG);
+	if (ret < 0)
+		return ret;
+
+	/* Equivalent to 3.9mA/bit in register ICHG_AV */
+	ret = DIV_ROUND_CLOSEST(ret * 39, 10);
+	return sprintf(buf, "%d\n", ret);
+}
+
+static ssize_t da9052_read_vbat(struct device *dev,
+	struct device_attribute *devattr, char *buf)
+{
+	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
+	int ret;
+
+	ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT);
+	if (ret < 0)
+		return ret;
+
+	return sprintf(buf, "%d\n", ret);
+}
+
+static ssize_t da9052_read_misc_channel(struct device *dev,
+	struct device_attribute *devattr, char *buf)
+{
+	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
+	int channel = to_sensor_dev_attr(devattr)->index;
+	int ret;
+
+	ret = da9052_adc_manual_read(hwmon->da9052, channel);
+	if (ret < 0)
+		return ret;
+
+	return sprintf(buf, "%d\n", ret);
+}
+
+static ssize_t da9052_read_tjunc(struct device *dev,
+	struct device_attribute *devattr, char *buf)
+{
+	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
+	int temp;
+	int ret;
+
+	ret = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
+	if (ret < 0)
+		return ret;
+
+	temp = ret;
+
+	ret = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
+	if (ret < 0)
+		return ret;
+
+	/* Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8 */
+	ret = 1708 * (temp - ret) - 108800;
+	return sprintf(buf, "%d\n", ret);
+}
+
+static ssize_t da9052_read_vbbat(struct device *dev,
+	struct device_attribute *devattr, char *buf)
+{
+	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
+	int ret;
+
+	ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
+	if (ret < 0)
+		return ret;
+
+	return sprintf(buf, "%d\n", ret);
+
+}
+
+static ssize_t da9052_hwmon_show_name(struct device *dev,
+		struct device_attribute *devattr, char *buf)
+{
+	return sprintf(buf, "da9052-hwmon\n");
+}
+
+static ssize_t show_label(struct device *dev,
+			  struct device_attribute *devattr, char *buf)
+{
+	return sprintf(buf, "%s\n",
+			input_names[to_sensor_dev_attr(devattr)->index]);
+}
+
+static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL,
+				DA9052_ADC_ICH);
+static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
+				DA9052_ADC_ICH);
+static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL,
+				DA9052_ADC_VBAT);
+static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL,
+				DA9052_ADC_VBAT);
+static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL,
+				DA9052_ADC_IN4);
+static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL,
+				DA9052_ADC_IN4);
+static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL,
+				DA9052_ADC_IN5);
+static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL,
+				DA9052_ADC_IN5);
+static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL,
+				DA9052_ADC_IN6);
+static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL,
+				DA9052_ADC_IN6);
+static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL,
+				DA9052_ADC_VBBAT);
+static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL,
+				DA9052_ADC_VBBAT);
+static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL,
+				DA9052_ADC_ICH);
+static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL,
+				DA9052_ADC_TJUNC);
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, da9052_read_tjunc, NULL,
+				DA9052_ADC_TJUNC);
+static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL,
+				DA9052_ADC_TJUNC);
+
+static DEVICE_ATTR(name, S_IRUGO, da9052_hwmon_show_name, NULL);
+
+static struct attribute *da9052_attr[] = {
+	&dev_attr_name.attr,
+
+	&sensor_dev_attr_in0_input.dev_attr.attr,
+	&sensor_dev_attr_in0_label.dev_attr.attr,
+	&sensor_dev_attr_curr1_input.dev_attr.attr,
+	&sensor_dev_attr_curr1_label.dev_attr.attr,
+	&sensor_dev_attr_temp1_input.dev_attr.attr,
+	&sensor_dev_attr_temp1_label.dev_attr.attr,
+	&sensor_dev_attr_in3_input.dev_attr.attr,
+	&sensor_dev_attr_in3_label.dev_attr.attr,
+	&sensor_dev_attr_in4_input.dev_attr.attr,
+	&sensor_dev_attr_in4_label.dev_attr.attr,
+	&sensor_dev_attr_in5_input.dev_attr.attr,
+	&sensor_dev_attr_in5_label.dev_attr.attr,
+	&sensor_dev_attr_in6_input.dev_attr.attr,
+	&sensor_dev_attr_in6_label.dev_attr.attr,
+	&sensor_dev_attr_temp1_input.dev_attr.attr,
+	&sensor_dev_attr_temp1_label.dev_attr.attr,
+	&sensor_dev_attr_in9_input.dev_attr.attr,
+	&sensor_dev_attr_in9_label.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group da9052_attr_group = {.attrs = da9052_attr};
+
+static int __init da9052_hwmon_probe(struct platform_device *pdev)
+{
+	struct da9052_hwmon *hwmon;
+	int ret;
+
+	hwmon = kzalloc(sizeof(struct da9052_hwmon), GFP_KERNEL);
+	if (!hwmon)
+		return -ENOMEM;
+
+	mutex_init(&hwmon->hwmon_lock);
+	hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
+
+	platform_set_drvdata(pdev, hwmon);
+
+	ret = sysfs_create_group(&pdev->dev.kobj, &da9052_attr_group);
+	if (ret)
+		goto err_mem;
+
+	hwmon->class_device = hwmon_device_register(&pdev->dev);
+	if (IS_ERR(hwmon->class_device)) {
+		ret = PTR_ERR(hwmon->class_device);
+		goto err_mem;
+	}
+
+	return 0;
+
+err_mem:
+	kfree(hwmon);
+	return ret;
+}
+
+static int __devexit da9052_hwmon_remove(struct platform_device *pdev)
+{
+	struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
+
+	hwmon_device_unregister(hwmon->class_device);
+	sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
+	mutex_destroy(&hwmon->hwmon_lock);
+	kfree(hwmon);
+
+	return 0;
+}
+
+static struct platform_driver da9052_hwmon_driver = {
+	.driver = {
+		.name		= "da9052-hwmon",
+		.owner	= THIS_MODULE,
+	},
+	.probe	= da9052_hwmon_probe,
+	.remove	= __devexit_p(da9052_hwmon_remove),
+
+};
+
+static int __init da9052_hwmon_init(void)
+{
+
+	return platform_driver_register(&da9052_hwmon_driver);
+}
+module_init(da9052_hwmon_init);
+
+static void __exit da9052_hwmon_exit(void)
+{
+	platform_driver_unregister(&da9052_hwmon_driver);
+}
+module_exit(da9052_hwmon_exit);
+
+MODULE_AUTHOR("David Dajun Chen <dchen@...semi.com>");
+MODULE_DESCRIPTION("DA9052 HWMON driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:da9052-hwmon");
diff -Naur linux-next-20110421.orig/drivers/hwmon/Kconfig linux-next-20110421/drivers/hwmon/Kconfig
--- linux-next-20110421.orig/drivers/hwmon/Kconfig	2011-04-26 09:31:34.000000000 +0500
+++ linux-next-20110421/drivers/hwmon/Kconfig	2011-05-04 14:10:00.000000000 +0500
@@ -303,6 +303,16 @@
 	  This driver can also be built as a module.  If so, the module
 	  will be called ds1621.
 
+config SENSORS_DA9052_ADC
+	tristate "Dialog DA9052 HWMON"
+	depends on PMIC_DA9052
+	help
+	  Say y here to support the ADC found on
+	  Dialog Semiconductor DA9052 PMIC.
+
+	  This driver can also be built as module. If so, the module
+	  will be called da9052-hwmon.
+
 config SENSORS_I5K_AMB
 	tristate "FB-DIMM AMB temperature sensor on Intel 5000 series chipsets"
 	depends on PCI && EXPERIMENTAL
diff -Naur linux-next-20110421.orig/drivers/hwmon/Makefile linux-next-20110421/drivers/hwmon/Makefile
--- linux-next-20110421.orig/drivers/hwmon/Makefile	2011-04-26 09:31:34.000000000 +0500
+++ linux-next-20110421/drivers/hwmon/Makefile	2011-05-04 14:10:00.000000000 +0500
@@ -41,6 +41,7 @@
 obj-$(CONFIG_SENSORS_ATXP1)		+= atxp1.o
 obj-$(CONFIG_SENSORS_CORETEMP)	+= coretemp.o
 obj-$(CONFIG_SENSORS_PKGTEMP)	+= pkgtemp.o
+obj-$(CONFIG_SENSORS_DA9052_ADC)+= da9052-hwmon.o
 obj-$(CONFIG_SENSORS_DME1737)	+= dme1737.o
 obj-$(CONFIG_SENSORS_DS620)		+= ds620.o
 obj-$(CONFIG_SENSORS_DS1621)		+= ds1621.o

Regards,
Ashish

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