[PATCHv1 6/11] HWMON: HWMON module of DA9052 PMIC driver

[Ashish Jangam]

Hi Randy,

HWMON Driver for Dialog Semiconductor DA9052 PMICs.

Changes made since last submission:
. Changed the return format for charging current, bat temperature
. and junction temperature
. Code formatting done
. Added DA9052 HWMON description file
. Ported on 2.6.38.2 kernel

Linux Kernel Version: 2.6.38.2

Signed-off-by: D. Chen <dchen@xxxxxxxxxxx>
---
diff -Naur linux-2.6.38.2/Documentation/hwmon/da9052 wrk_linux-2.6.38.2/Documentation/hwmon/da9052
--- linux-2.6.38.2/Documentation/hwmon/da9052	1970-01-01 05:00:00.000000000 +0500
+++ wrk_linux-2.6.38.2/Documentation/hwmon/da9052	2011-04-14 15:27:49.000000000 +0500
@@ -0,0 +1,60 @@
+Kernel driver da9052-hwmon
+==========================
+
+Supported chips:
+  * Dialog Semiconductors DA9052 PMICs
+    Prefix: 'da9052'
+    Datasheet:Available on the Internet
+
+Authors: David Dajun Chen <dchen@xxxxxxxxxxx>
+
+Description
+-----------
+
+The DA9052 is a highly integrated PMIC subsystem with supply domain flexibility
+to support a wide range of application processors, associated peripherals and
+user interface functions.
+
+Combined with a switched-mode DC input/USB compatible charger, full power path
+management and multiple sleep modes the device offers an energy-optimised
+solution suitable for portable handheld, wireless and infotainment applications.
+
+Interfacing directly to a Li-lon/Polymer battery pack the high efficiency
+switching charger supports precise current/voltage charging as well as
+pre charge and USB modes without processor interaction. During charging the die
+temperature is thermally regulated enabling higher capacity batteries to be
+rapidly charged at currents up to 1.25A with minimum thermal impact to
+space-constrained PCB.s.
+
+USB suspend mode operation is supported and for robustness the USB power inputs
+are internally protected against over-voltage conditions.
+
+The autonomous power path controller seamlessly detects and manages energy flow
+between an AC adaptor, USB cable and battery whilst maintaining USB power
+specification compliance.
+
+The internally-generated system power rail supports power scenarios such as
+instant-on with a full discharged battery. A reverse-protected backup battery
+charger is also integrated into the power path function.
+
+The power efficiency and flexibility of the switching input stage is maintained
+to the generated supplies. Controlled by a programmable digital power manager
+the 14 user- programmable switched/linear regulators may be configured
+for a variety of start up sequences, levels and timings.
+
+Voltage Monitoring
+------------------
+
+Voltages are sampled by a 10 bit ADC.  Voltages in milivolts are 1.465
+times the ADC value.
+
+Temperature Monitoring
+----------------------
+
+Temperatures are sampled by a 10 bit ADC.  Chip and battery temperatures
+are available.  The chip temperature is calculated as:
+
+	Degrees celsius = (512.18 - data) / 1.0983
+
+while the battery temperature calculation will depend on the NTC
+thermistor component.
diff -Naur linux-2.6.38.2/drivers/hwmon/da9052-hwmon.c wrk_linux-2.6.38.2/drivers/hwmon/da9052-hwmon.c
--- linux-2.6.38.2/drivers/hwmon/da9052-hwmon.c	1970-01-01 05:00:00.000000000 +0500
+++ wrk_linux-2.6.38.2/drivers/hwmon/da9052-hwmon.c	2011-04-14 15:36:40.000000000 +0500
@@ -0,0 +1,328 @@
+/*
+ * HWMON Driver for Dialog DA9052
+ *
+ * Copyright(c) 2009 Dialog Semiconductor Ltd.
+ *
+ * Author: Dajun Chen <dchen@xxxxxxxxxxx>
+ *
+ *  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 *input_names[] = {
+	[DA9052_ADC_VDDOUT]=	"VDDOUT",
+	[DA9052_ADC_ICH]	=	"CHARGING CURRENT",
+	[DA9052_ADC_TBAT]	=	"BATTERY TEMP",
+	[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 = -EIO;
+
+	mutex_lock(&hwmon->hwmon_lock);
+
+	ret = da9052_enable_vddout_channel(hwmon->da9052);
+	if (ret < 0) {
+		mutex_unlock(&hwmon->hwmon_lock);
+		return ret;
+	}
+
+	ret = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG);
+	if (ret < 0) {
+		mutex_unlock(&hwmon->hwmon_lock);
+		return ret;
+	}
+
+	ret = da9052_disable_vddout_channel(hwmon->da9052);
+	if (ret < 0) {
+		mutex_unlock(&hwmon->hwmon_lock);
+		return ret;
+	}
+
+	mutex_unlock(&hwmon->hwmon_lock);
+	return sprintf(buf, "%u\n", 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_tbat(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_TBAT_RES_REG);
+	if (ret < 0)
+		return ret;
+
+	/* Degrees celsius = (512.18-ret) / 1.0983 */
+	ret = 512180 - (ret * 1000);
+	ret = DIV_ROUND_CLOSEST(ret * 10000, 10983);
+	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, "%u\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 -EIO;
+
+	return sprintf(buf, "%u\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_RESâ T_OFFSET) â 108.8 */
+	ret = DIV_ROUND_CLOSEST((temp - ret) * 1708, 1000);
+	ret = round_down(ret, 108.8);
+	return sprintf(buf, "%d\n", (char)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, "%u\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)
+{
+	int channel = to_sensor_dev_attr(devattr)->index;
+
+	return sprintf(buf, "%s\n", input_names[channel]);
+}
+
+#define DA9052_ADC_CHANNELS(id, func_name, name)\
+	static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label,\
+				  NULL, name);\
+	static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, func_name,\
+				  NULL, name)
+
+DA9052_ADC_CHANNELS(0, da9052_read_vddout, DA9052_ADC_VDDOUT);
+DA9052_ADC_CHANNELS(1, da9052_read_ich, DA9052_ADC_ICH);
+DA9052_ADC_CHANNELS(2, da9052_read_tbat, DA9052_ADC_TBAT);
+DA9052_ADC_CHANNELS(3, da9052_read_vbat, DA9052_ADC_VBAT);
+DA9052_ADC_CHANNELS(4, da9052_read_misc_channel, DA9052_ADC_IN4);
+DA9052_ADC_CHANNELS(5, da9052_read_misc_channel, DA9052_ADC_IN5);
+DA9052_ADC_CHANNELS(6, da9052_read_misc_channel, DA9052_ADC_IN6);
+DA9052_ADC_CHANNELS(8, da9052_read_tjunc, DA9052_ADC_TJUNC);
+DA9052_ADC_CHANNELS(9, da9052_read_vbbat, DA9052_ADC_VBBAT);
+
+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_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,
+	&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_in8_input.dev_attr.attr,
+	&sensor_dev_attr_in8_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);
+
+	hwmon->class_device = hwmon_device_register(&pdev->dev);
+	if (IS_ERR(hwmon->class_device)) {
+		ret = PTR_ERR(hwmon->class_device);
+		goto err_sysfs;
+	}
+
+	ret = sysfs_create_group(&pdev->dev.kobj, &da9052_attr_group);
+	if (ret)
+		goto err_mem;
+
+	platform_set_drvdata(pdev, hwmon);
+
+	return 0;
+
+err_sysfs:
+	sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
+err_mem:
+	mutex_destroy(&hwmon->hwmon_lock);
+	kfree(hwmon);
+	return ret;
+}
+
+static int __devexit da9052_hwmon_remove(struct platform_device *pdev)
+{
+	struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
+
+	mutex_destroy(&hwmon->hwmon_lock);
+	hwmon_device_unregister(hwmon->class_device);
+	sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
+	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@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("DA9052 ADC driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:da9052-hwmon");
diff -Naur linux-2.6.38.2/drivers/hwmon/Kconfig wrk_linux-2.6.38.2/drivers/hwmon/Kconfig
--- linux-2.6.38.2/drivers/hwmon/Kconfig	2011-03-27 23:37:20.000000000 +0500
+++ wrk_linux-2.6.38.2/drivers/hwmon/Kconfig	2011-04-14 15:37:09.000000000 +0500
@@ -294,6 +294,13 @@
 	  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.
+
 config SENSORS_I5K_AMB
 	tristate "FB-DIMM AMB temperature sensor on Intel 5000 series chipsets"
 	depends on PCI && EXPERIMENTAL
diff -Naur linux-2.6.38.2/drivers/hwmon/Makefile wrk_linux-2.6.38.2/drivers/hwmon/Makefile
--- linux-2.6.38.2/drivers/hwmon/Makefile	2011-03-27 23:37:20.000000000 +0500
+++ wrk_linux-2.6.38.2/drivers/hwmon/Makefile	2011-04-14 15:37:01.000000000 +0500
@@ -40,6 +40,7 @@
 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 J


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