hwmon: DA9055 HWMON driver (e5970223) · Commits · 戴 / test

Documentation/hwmon/da9055

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		Supported chips:
		* Dialog Semiconductors DA9055 PMIC
		Prefix: 'da9055'
		Datasheet: Datasheet is not publicly available.

		Authors: David Dajun Chen <dchen@diasemi.com>

		Description
		-----------

		The DA9055 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 5
		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: ADC_IN1 - high impedance input (0 - 2.5V)
		Channel 2: ADC_IN2 - high impedance input (0 - 2.5V)
		Channel 3: ADC_IN3 - high impedance input (0 - 2.5V)
		Channel 4: Internal Tjunc. - sense (internal temp. sensor)

		By using sysfs attributes we can measure the system voltage VDDOUT,
		chip junction temperature and auxiliary channels voltages.

		Voltage Monitoring
		------------------

		Voltages are sampled in a AUTO mode it can be manually sampled too and results
		are stored in a 10 bit ADC.

		The system voltage is calculated as:
		Milli volt = ((ADC value * 1000) / 85) + 2500

		The voltages on ADC channels 1, 2 and 3 are calculated as:
		Milli volt = (ADC value * 1000) / 102

		Temperature Monitoring
		----------------------

		Temperatures are sampled by a 10 bit ADC. Junction temperatures
		are monitored by the ADC channels.

		The junction temperature is calculated:
		Degrees celsius = -0.4084 * (ADC_RES - T_OFFSET) + 307.6332
		The junction temperature attribute is supported by the driver.

drivers/hwmon/Kconfig

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		@@ -334,6 +334,16 @@ config SENSORS_DA9052_ADC
		This driver can also be built as module. If so, the module
		will be called da9052-hwmon.

		config SENSORS_DA9055
		tristate "Dialog Semiconductor DA9055 ADC"
		depends on MFD_DA9055
		help
		If you say yes here you get support for ADC on the Dialog
		Semiconductor DA9055 PMIC.

		This driver can also be built as a module. If so, the module
		will be called da9055-hwmon.

		config SENSORS_I5K_AMB
		tristate "FB-DIMM AMB temperature sensor on Intel 5000 series chipsets"
		depends on PCI

drivers/hwmon/Makefile

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		@@ -44,6 +44,7 @@ obj-$(CONFIG_SENSORS_ASC7621) += asc7621.o
		obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o
		obj-$(CONFIG_SENSORS_CORETEMP) += coretemp.o
		obj-$(CONFIG_SENSORS_DA9052_ADC)+= da9052-hwmon.o
		obj-$(CONFIG_SENSORS_DA9055)+= da9055-hwmon.o
		obj-$(CONFIG_SENSORS_DME1737) += dme1737.o
		obj-$(CONFIG_SENSORS_DS620) += ds620.o
		obj-$(CONFIG_SENSORS_DS1621) += ds1621.o

drivers/hwmon/da9055-hwmon.c

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		/*
		* HWMON Driver for Dialog DA9055
		*
		* Copyright(c) 2012 Dialog Semiconductor Ltd.
		*
		* Author: David Dajun Chen <dchen@diasemi.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/delay.h>
		#include <linux/err.h>
		#include <linux/hwmon.h>
		#include <linux/hwmon-sysfs.h>
		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/platform_device.h>
		#include <linux/completion.h>

		#include <linux/mfd/da9055/core.h>
		#include <linux/mfd/da9055/reg.h>

		#define DA9055_ADCIN_DIV 102
		#define DA9055_VSYS_DIV 85

		#define DA9055_ADC_VSYS 0
		#define DA9055_ADC_ADCIN1 1
		#define DA9055_ADC_ADCIN2 2
		#define DA9055_ADC_ADCIN3 3
		#define DA9055_ADC_TJUNC 4

		struct da9055_hwmon {
		struct da9055 *da9055;
		struct device *class_device;
		struct mutex hwmon_lock;
		struct mutex irq_lock;
		struct completion done;
		};

		static const char * const input_names[] = {
		[DA9055_ADC_VSYS] = "VSYS",
		[DA9055_ADC_ADCIN1] = "ADC IN1",
		[DA9055_ADC_ADCIN2] = "ADC IN2",
		[DA9055_ADC_ADCIN3] = "ADC IN3",
		[DA9055_ADC_TJUNC] = "CHIP TEMP",
		};

		static const u8 chan_mux[DA9055_ADC_TJUNC + 1] = {
		[DA9055_ADC_VSYS] = DA9055_ADC_MUX_VSYS,
		[DA9055_ADC_ADCIN1] = DA9055_ADC_MUX_ADCIN1,
		[DA9055_ADC_ADCIN2] = DA9055_ADC_MUX_ADCIN2,
		[DA9055_ADC_ADCIN3] = DA9055_ADC_MUX_ADCIN1,
		[DA9055_ADC_TJUNC] = DA9055_ADC_MUX_T_SENSE,
		};

		static int da9055_adc_manual_read(struct da9055_hwmon *hwmon,
		unsigned char channel)
		{
		int ret;
		unsigned short calc_data;
		unsigned short data;
		unsigned char mux_sel;
		struct da9055 *da9055 = hwmon->da9055;

		if (channel > DA9055_ADC_TJUNC)
		return -EINVAL;

		mutex_lock(&hwmon->irq_lock);

		/* Selects desired MUX for manual conversion */
		mux_sel = chan_mux[channel] \| DA9055_ADC_MAN_CONV;

		ret = da9055_reg_write(da9055, DA9055_REG_ADC_MAN, mux_sel);
		if (ret < 0)
		goto err;

		/* Wait for an interrupt */
		if (!wait_for_completion_timeout(&hwmon->done,
		msecs_to_jiffies(500))) {
		dev_err(da9055->dev,
		"timeout waiting for ADC conversion interrupt\n");
		ret = -ETIMEDOUT;
		goto err;
		}

		ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_H);
		if (ret < 0)
		goto err;

		calc_data = (unsigned short)ret;
		data = calc_data << 2;

		ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_L);
		if (ret < 0)
		goto err;

		calc_data = (unsigned short)(ret & DA9055_ADC_LSB_MASK);
		data \|= calc_data;

		ret = data;

		err:
		mutex_unlock(&hwmon->irq_lock);
		return ret;
		}

		static irqreturn_t da9055_auxadc_irq(int irq, void *irq_data)
		{
		struct da9055_hwmon *hwmon = irq_data;

		complete(&hwmon->done);

		return IRQ_HANDLED;
		}

		/* Conversion function for VSYS and ADCINx */
		static inline int volt_reg_to_mV(int value, int channel)
		{
		if (channel == DA9055_ADC_VSYS)
		return DIV_ROUND_CLOSEST(value * 1000, DA9055_VSYS_DIV) + 2500;
		else
		return DIV_ROUND_CLOSEST(value * 1000, DA9055_ADCIN_DIV);
		}

		static int da9055_enable_auto_mode(struct da9055 *da9055, int channel)
		{

		return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel,
		1 << channel);

		}

		static int da9055_disable_auto_mode(struct da9055 *da9055, int channel)
		{

		return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel, 0);
		}

		static ssize_t da9055_read_auto_ch(struct device *dev,
		struct device_attribute devattr, char buf)
		{
		struct da9055_hwmon *hwmon = dev_get_drvdata(dev);
		int ret, adc;
		int channel = to_sensor_dev_attr(devattr)->index;

		mutex_lock(&hwmon->hwmon_lock);

		ret = da9055_enable_auto_mode(hwmon->da9055, channel);
		if (ret < 0)
		goto hwmon_err;

		usleep_range(10000, 10500);

		adc = da9055_reg_read(hwmon->da9055, DA9055_REG_VSYS_RES + channel);
		if (adc < 0) {
		ret = adc;
		goto hwmon_err_release;
		}

		ret = da9055_disable_auto_mode(hwmon->da9055, channel);
		if (ret < 0)
		goto hwmon_err;

		mutex_unlock(&hwmon->hwmon_lock);

		return sprintf(buf, "%d\n", volt_reg_to_mV(adc, channel));

		hwmon_err_release:
		da9055_disable_auto_mode(hwmon->da9055, channel);
		hwmon_err:
		mutex_unlock(&hwmon->hwmon_lock);
		return ret;
		}

		static ssize_t da9055_read_tjunc(struct device *dev,
		struct device_attribute devattr, char buf)
		{
		struct da9055_hwmon *hwmon = dev_get_drvdata(dev);
		int tjunc;
		int toffset;

		tjunc = da9055_adc_manual_read(hwmon, DA9055_ADC_TJUNC);
		if (tjunc < 0)
		return tjunc;

		toffset = da9055_reg_read(hwmon->da9055, DA9055_REG_T_OFFSET);
		if (toffset < 0)
		return toffset;

		/*
		* Degrees celsius = -0.4084 * (ADC_RES - T_OFFSET) + 307.6332
		* T_OFFSET is a trim value used to improve accuracy of the result
		*/
		return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(-4084 * (tjunc - toffset)
		+ 3076332, 10000));
		}

		static ssize_t da9055_hwmon_show_name(struct device *dev,
		struct device_attribute *devattr,
		char *buf)
		{
		return sprintf(buf, "da9055-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, da9055_read_auto_ch, NULL,
		DA9055_ADC_VSYS);
		static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
		DA9055_ADC_VSYS);
		static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, da9055_read_auto_ch, NULL,
		DA9055_ADC_ADCIN1);
		static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, show_label, NULL,
		DA9055_ADC_ADCIN1);
		static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, da9055_read_auto_ch, NULL,
		DA9055_ADC_ADCIN2);
		static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, show_label, NULL,
		DA9055_ADC_ADCIN2);
		static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9055_read_auto_ch, NULL,
		DA9055_ADC_ADCIN3);
		static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL,
		DA9055_ADC_ADCIN3);

		static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, da9055_read_tjunc, NULL,
		DA9055_ADC_TJUNC);
		static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL,
		DA9055_ADC_TJUNC);

		static DEVICE_ATTR(name, S_IRUGO, da9055_hwmon_show_name, NULL);

		static struct attribute *da9055_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_temp1_input.dev_attr.attr,
		&sensor_dev_attr_temp1_label.dev_attr.attr,
		NULL
		};

		static const struct attribute_group da9055_attr_group = {.attrs = da9055_attr};

		static int da9055_hwmon_probe(struct platform_device *pdev)
		{
		struct da9055_hwmon *hwmon;
		int hwmon_irq, ret;

		hwmon = devm_kzalloc(&pdev->dev, sizeof(struct da9055_hwmon),
		GFP_KERNEL);
		if (!hwmon)
		return -ENOMEM;

		mutex_init(&hwmon->hwmon_lock);
		mutex_init(&hwmon->irq_lock);

		init_completion(&hwmon->done);
		hwmon->da9055 = dev_get_drvdata(pdev->dev.parent);

		platform_set_drvdata(pdev, hwmon);

		hwmon_irq = platform_get_irq_byname(pdev, "HWMON");
		if (hwmon_irq < 0)
		return hwmon_irq;

		hwmon_irq = regmap_irq_get_virq(hwmon->da9055->irq_data, hwmon_irq);
		if (hwmon_irq < 0)
		return hwmon_irq;

		ret = devm_request_threaded_irq(&pdev->dev, hwmon_irq,
		NULL, da9055_auxadc_irq,
		IRQF_TRIGGER_HIGH \| IRQF_ONESHOT,
		"adc-irq", hwmon);
		if (ret != 0) {
		dev_err(hwmon->da9055->dev, "DA9055 ADC IRQ failed ret=%d\n",
		ret);
		return ret;
		}

		ret = sysfs_create_group(&pdev->dev.kobj, &da9055_attr_group);
		if (ret)
		return ret;

		hwmon->class_device = hwmon_device_register(&pdev->dev);
		if (IS_ERR(hwmon->class_device)) {
		ret = PTR_ERR(hwmon->class_device);
		goto err;
		}

		return 0;

		err:
		sysfs_remove_group(&pdev->dev.kobj, &da9055_attr_group);
		return ret;
		}

		static int da9055_hwmon_remove(struct platform_device *pdev)
		{
		struct da9055_hwmon *hwmon = platform_get_drvdata(pdev);

		sysfs_remove_group(&pdev->dev.kobj, &da9055_attr_group);
		hwmon_device_unregister(hwmon->class_device);

		return 0;
		}

		static struct platform_driver da9055_hwmon_driver = {
		.probe = da9055_hwmon_probe,
		.remove = da9055_hwmon_remove,
		.driver = {
		.name = "da9055-hwmon",
		.owner = THIS_MODULE,
		},
		};

		module_platform_driver(da9055_hwmon_driver);

		MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
		MODULE_DESCRIPTION("DA9055 HWMON driver");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("platform:da9055-hwmon");

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