mfd: Add new ab8500 GPADC driver (dae2db30) · Commits · e / devices / android_kernel_xiaomi_nabu

drivers/mfd/Kconfig

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	@@ -534,6 +534,13 @@ config AB8500_DEBUG
	Select this option if you want debug information using the debug		Select this option if you want debug information using the debug
	filesystem, debugfs.		filesystem, debugfs.

			config AB8500_GPADC
			bool "AB8500 GPADC driver"
			depends on AB8500_CORE && REGULATOR_AB8500
			default y
			help
			AB8500 GPADC driver used to convert Acc and battery/ac/usb voltage

	config AB3550_CORE		config AB3550_CORE
	bool "ST-Ericsson AB3550 Mixed Signal Circuit core functions"		bool "ST-Ericsson AB3550 Mixed Signal Circuit core functions"
	select MFD_CORE		select MFD_CORE

drivers/mfd/Makefile

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	@@ -74,6 +74,7 @@ obj-$(CONFIG_AB3550_CORE) += ab3550-core.o
	obj-$(CONFIG_AB8500_CORE) += ab8500-core.o ab8500-sysctrl.o		obj-$(CONFIG_AB8500_CORE) += ab8500-core.o ab8500-sysctrl.o
	obj-$(CONFIG_AB8500_I2C_CORE) += ab8500-i2c.o		obj-$(CONFIG_AB8500_I2C_CORE) += ab8500-i2c.o
	obj-$(CONFIG_AB8500_DEBUG) += ab8500-debugfs.o		obj-$(CONFIG_AB8500_DEBUG) += ab8500-debugfs.o
			obj-$(CONFIG_AB8500_GPADC) += ab8500-gpadc.o
	obj-$(CONFIG_MFD_TIMBERDALE) += timberdale.o		obj-$(CONFIG_MFD_TIMBERDALE) += timberdale.o
	obj-$(CONFIG_PMIC_ADP5520) += adp5520.o		obj-$(CONFIG_PMIC_ADP5520) += adp5520.o
	obj-$(CONFIG_LPC_SCH) += lpc_sch.o		obj-$(CONFIG_LPC_SCH) += lpc_sch.o

drivers/mfd/ab8500-gpadc.c

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			/*
			* Copyright (C) ST-Ericsson SA 2010
			*
			* License Terms: GNU General Public License v2
			* Author: Arun R Murthy <arun.murthy@stericsson.com>
			*/
			#include <linux/init.h>
			#include <linux/module.h>
			#include <linux/device.h>
			#include <linux/interrupt.h>
			#include <linux/spinlock.h>
			#include <linux/delay.h>
			#include <linux/platform_device.h>
			#include <linux/completion.h>
			#include <linux/regulator/consumer.h>
			#include <linux/err.h>
			#include <linux/slab.h>
			#include <linux/mfd/ab8500.h>
			#include <linux/mfd/abx500.h>
			#include <linux/mfd/ab8500-gpadc.h>

			/*
			* GPADC register offsets
			* Bank : 0x0A
			*/
			#define AB8500_GPADC_CTRL1_REG 0x00
			#define AB8500_GPADC_CTRL2_REG 0x01
			#define AB8500_GPADC_CTRL3_REG 0x02
			#define AB8500_GPADC_AUTO_TIMER_REG 0x03
			#define AB8500_GPADC_STAT_REG 0x04
			#define AB8500_GPADC_MANDATAL_REG 0x05
			#define AB8500_GPADC_MANDATAH_REG 0x06
			#define AB8500_GPADC_AUTODATAL_REG 0x07
			#define AB8500_GPADC_AUTODATAH_REG 0x08
			#define AB8500_GPADC_MUX_CTRL_REG 0x09

			/* gpadc constants */
			#define EN_VINTCORE12 0x04
			#define EN_VTVOUT 0x02
			#define EN_GPADC 0x01
			#define DIS_GPADC 0x00
			#define SW_AVG_16 0x60
			#define ADC_SW_CONV 0x04
			#define EN_BUF 0x40
			#define DIS_ZERO 0x00
			#define GPADC_BUSY 0x01

			/**
			* struct ab8500_gpadc - ab8500 GPADC device information
			* @dev: pointer to the struct device
			* @parent: pointer to the parent device structure ab8500
			* @ab8500_gpadc_complete: pointer to the struct completion, to indicate
			* the completion of gpadc conversion
			* @ab8500_gpadc_lock: structure of type mutex
			* @regu: pointer to the struct regulator
			* @irq: interrupt number that is used by gpadc
			*/
			static struct ab8500_gpadc {
			struct device *dev;
			struct ab8500 *parent;
			struct completion ab8500_gpadc_complete;
			struct mutex ab8500_gpadc_lock;
			struct regulator *regu;
			int irq;
			} *di;

			/**
			* ab8500_gpadc_convert() - gpadc conversion
			* @input: analog input to be converted to digital data
			*
			* This function converts the selected analog i/p to digital
			* data. Thereafter calibration has to be made to obtain the
			* data in the required quantity measurement.
			*/
			int ab8500_gpadc_convert(u8 input)
			{
			int ret;
			u16 data = 0;
			int looplimit = 0;
			u8 val, low_data, high_data;

			if (!di)
			return -ENODEV;

			mutex_lock(&di->ab8500_gpadc_lock);
			/* Enable VTVout LDO this is required for GPADC */
			regulator_enable(di->regu);

			/* Check if ADC is not busy, lock and proceed */
			do {
			ret = abx500_get_register_interruptible(di->dev, AB8500_GPADC,
			AB8500_GPADC_STAT_REG, &val);
			if (ret < 0)
			goto out;
			if (!(val & GPADC_BUSY))
			break;
			msleep(10);
			} while (++looplimit < 10);
			if (looplimit >= 10 && (val & GPADC_BUSY)) {
			dev_err(di->dev, "gpadc_conversion: GPADC busy");
			ret = -EINVAL;
			goto out;
			}

			/* Enable GPADC */
			ret = abx500_mask_and_set_register_interruptible(di->dev, AB8500_GPADC,
			AB8500_GPADC_CTRL1_REG, EN_GPADC, EN_GPADC);
			if (ret < 0) {
			dev_err(di->dev, "gpadc_conversion: enable gpadc failed\n");
			goto out;
			}
			/* Select the input source and set average samples to 16 */
			ret = abx500_set_register_interruptible(di->dev, AB8500_GPADC,
			AB8500_GPADC_CTRL2_REG, (input \| SW_AVG_16));
			if (ret < 0) {
			dev_err(di->dev,
			"gpadc_conversion: set avg samples failed\n");
			goto out;
			}
			/* Enable ADC, Buffering and select rising edge, start Conversion */
			ret = abx500_mask_and_set_register_interruptible(di->dev, AB8500_GPADC,
			AB8500_GPADC_CTRL1_REG, EN_BUF, EN_BUF);
			if (ret < 0) {
			dev_err(di->dev,
			"gpadc_conversion: select falling edge failed\n");
			goto out;
			}
			ret = abx500_mask_and_set_register_interruptible(di->dev, AB8500_GPADC,
			AB8500_GPADC_CTRL1_REG, ADC_SW_CONV, ADC_SW_CONV);
			if (ret < 0) {
			dev_err(di->dev,
			"gpadc_conversion: start s/w conversion failed\n");
			goto out;
			}
			/* wait for completion of conversion */
			if (!wait_for_completion_timeout(&di->ab8500_gpadc_complete, 2*HZ)) {
			dev_err(di->dev,
			"timeout: didnt recieve GPADC conversion interrupt\n");
			ret = -EINVAL;
			goto out;
			}

			/* Read the converted RAW data */
			ret = abx500_get_register_interruptible(di->dev, AB8500_GPADC,
			AB8500_GPADC_MANDATAL_REG, &low_data);
			if (ret < 0) {
			dev_err(di->dev, "gpadc_conversion: read low data failed\n");
			goto out;
			}

			ret = abx500_get_register_interruptible(di->dev, AB8500_GPADC,
			AB8500_GPADC_MANDATAH_REG, &high_data);
			if (ret < 0) {
			dev_err(di->dev, "gpadc_conversion: read high data failed\n");
			goto out;
			}

			data = (high_data << 8) \| low_data;
			/* Disable GPADC */
			ret = abx500_set_register_interruptible(di->dev, AB8500_GPADC,
			AB8500_GPADC_CTRL1_REG, DIS_GPADC);
			if (ret < 0) {
			dev_err(di->dev, "gpadc_conversion: disable gpadc failed\n");
			goto out;
			}
			/* Disable VTVout LDO this is required for GPADC */
			regulator_disable(di->regu);
			mutex_unlock(&di->ab8500_gpadc_lock);
			return data;

			out:
			/*
			* It has shown to be needed to turn off the GPADC if an error occurs,
			* otherwise we might have problem when waiting for the busy bit in the
			* GPADC status register to go low. In V1.1 there wait_for_completion
			* seems to timeout when waiting for an interrupt.. Not seen in V2.0
			*/
			(void) abx500_set_register_interruptible(di->dev, AB8500_GPADC,
			AB8500_GPADC_CTRL1_REG, DIS_GPADC);
			regulator_disable(di->regu);
			mutex_unlock(&di->ab8500_gpadc_lock);
			dev_err(di->dev, "gpadc_conversion: Failed to AD convert channel %d\n",
			input);
			return ret;
			}
			EXPORT_SYMBOL(ab8500_gpadc_convert);

			/**
			* ab8500_bm_gpswadcconvend_handler() - isr for s/w gpadc conversion completion
			* @irq: irq number
			* @data: pointer to the data passed during request irq
			*
			* This is a interrupt service routine for s/w gpadc conversion completion.
			* Notifies the gpadc completion is completed and the converted raw value
			* can be read from the registers.
			* Returns IRQ status(IRQ_HANDLED)
			*/
			static irqreturn_t ab8500_bm_gpswadcconvend_handler(int irq, void *_di)
			{
			struct ab8500_gpadc *gpadc = _di;

			complete(&gpadc->ab8500_gpadc_complete);

			return IRQ_HANDLED;
			}

			static int __devinit ab8500_gpadc_probe(struct platform_device *pdev)
			{
			int ret = 0;
			struct ab8500_gpadc *gpadc;

			gpadc = kzalloc(sizeof(struct ab8500_gpadc), GFP_KERNEL);
			if (!gpadc) {
			dev_err(&pdev->dev, "Error: No memory\n");
			return -ENOMEM;
			}

			gpadc->parent = dev_get_drvdata(pdev->dev.parent);
			gpadc->irq = platform_get_irq_byname(pdev, "SW_CONV_END");
			if (gpadc->irq < 0) {
			dev_err(gpadc->dev, "failed to get platform irq-%d\n", di->irq);
			ret = gpadc->irq;
			goto fail;
			}

			gpadc->dev = &pdev->dev;
			mutex_init(&di->ab8500_gpadc_lock);

			/* Initialize completion used to notify completion of conversion */
			init_completion(&gpadc->ab8500_gpadc_complete);

			/* Register interrupt - SwAdcComplete */
			ret = request_threaded_irq(gpadc->irq, NULL,
			ab8500_bm_gpswadcconvend_handler,
			IRQF_NO_SUSPEND \| IRQF_SHARED, "ab8500-gpadc", gpadc);
			if (ret < 0) {
			dev_err(gpadc->dev, "Failed to register interrupt, irq: %d\n",
			gpadc->irq);
			goto fail;
			}

			/* VTVout LDO used to power up ab8500-GPADC */
			gpadc->regu = regulator_get(&pdev->dev, "vddadc");
			if (IS_ERR(gpadc->regu)) {
			ret = PTR_ERR(gpadc->regu);
			dev_err(gpadc->dev, "failed to get vtvout LDO\n");
			goto fail;
			}
			di = gpadc;
			dev_dbg(gpadc->dev, "probe success\n");
			return 0;
			fail:
			kfree(gpadc);
			gpadc = NULL;
			return ret;
			}

			static int __devexit ab8500_gpadc_remove(struct platform_device *pdev)
			{
			struct ab8500_gpadc *gpadc = platform_get_drvdata(pdev);

			/* remove interrupt - completion of Sw ADC conversion */
			free_irq(gpadc->irq, di);
			/* disable VTVout LDO that is being used by GPADC */
			regulator_put(gpadc->regu);
			kfree(gpadc);
			gpadc = NULL;
			return 0;
			}

			static struct platform_driver ab8500_gpadc_driver = {
			.probe = ab8500_gpadc_probe,
			.remove = __devexit_p(ab8500_gpadc_remove),
			.driver = {
			.name = "ab8500-gpadc",
			.owner = THIS_MODULE,
			},
			};

			static int __init ab8500_gpadc_init(void)
			{
			return platform_driver_register(&ab8500_gpadc_driver);
			}

			static void __exit ab8500_gpadc_exit(void)
			{
			platform_driver_unregister(&ab8500_gpadc_driver);
			}

			subsys_initcall_sync(ab8500_gpadc_init);
			module_exit(ab8500_gpadc_exit);

			MODULE_LICENSE("GPL v2");
			MODULE_AUTHOR("Arun R Murthy");
			MODULE_ALIAS("platform:ab8500_gpadc");
			MODULE_DESCRIPTION("AB8500 GPADC driver");

include/linux/mfd/ab8500-gpadc.h

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			/*
			* Copyright (C) 2010 ST-Ericsson SA
			* Licensed under GPLv2.
			*
			* Author: Arun R Murthy <arun.murthy@stericsson.com>
			*/

			#ifndef _AB8500_GPADC_H
			#define _AB8500_GPADC_H

			/* GPADC source: From datasheet(ADCSwSel[4:0] in GPADCCtrl2) */
			#define BAT_CTRL 0x01
			#define BTEMP_BALL 0x02
			#define MAIN_CHARGER_V 0x03
			#define ACC_DETECT1 0x04
			#define ACC_DETECT2 0x05
			#define ADC_AUX1 0x06
			#define ADC_AUX2 0x07
			#define MAIN_BAT_V 0x08
			#define VBUS_V 0x09
			#define MAIN_CHARGER_C 0x0A
			#define USB_CHARGER_C 0x0B
			#define BK_BAT_V 0x0C
			#define DIE_TEMP 0x0D

			int ab8500_gpadc_convert(u8 input);

			#endif /* _AB8500_GPADC_H */