Date:	Fri, 19 Apr 2013 20:22:12 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Anthony Olech <anthony.olech.opensource@...semi.com>
CC:	Jonathan Cameron <jic23@....ac.uk>, linux-iio@...r.kernel.org,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Arnd Bergmann <arnd@...db.de>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Steven Toth <stoth@...nellabs.com>,
	Michael Krufky <mkrufky@...nellabs.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Dajun Chen <david.chen@...semi.com>
Subject: Re: [NEW DRIVER V6 2/7] drivers/iio/adc: DA9058 ADC driver

Same issues as in v5 plus one more ...


On 04/19/2013 06:56 PM, Anthony Olech wrote:
> This patch is relative to next-20130419 of linux-next
> 
> This is the ADC component driver of the Dialog DA9058 PMIC.
> This driver is just one component of the whole DA9058 PMIC
> driver. It depends on the DA9058 CORE component driver.
> The HWMON component driver depends on this ADC component driver.
> 
> This component driver recieves the actual platform data from
> the DA9058 CORE driver, whose settings may be overridden from
> the platform data supplied from the machine driver.
> 
> Changes relative to V5 of this patch:
> - rebased to next-20130419 in git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> - removed redundant #include <linux/mfd/da9058/version.h>
> - changed to using devm_request_threaded_irq()

This creates a race condition...

> - corrected dates on copyright statements
> 
> Signed-off-by: Anthony Olech <anthony.olech.opensource@...semi.com>
> Signed-off-by: David Dajun Chen <david.chen@...semi.com>
> ---
>  drivers/iio/adc/Kconfig      |   12 ++
>  drivers/iio/adc/Makefile     |    1 +
>  drivers/iio/adc/da9058-adc.c |  396 ++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 409 insertions(+)
>  create mode 100644 drivers/iio/adc/da9058-adc.c
> 
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index ab0767e6..68162bf 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -111,6 +111,18 @@ config EXYNOS_ADC
>  	  of SoCs for drivers such as the touchscreen and hwmon to use to share
>  	  this resource.
>  
> +config DA9058_ADC
> +	tristate "Dialog DA9058 PMIC ADC"
> +	depends on MFD_DA9058
> +	select SYSFS
> +	help
> +	  Say yes here to build support for the ADC component of
> +	  the DAILOG DA9058 PMIC.
> +	  If unsure, say N (but it's safe to say "Y").
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called da9058-adc.
> +
>  config LP8788_ADC
>  	bool "LP8788 ADC driver"
>  	depends on MFD_LP8788
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index 0a825be..ad04a7d 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -11,6 +11,7 @@ obj-$(CONFIG_AD7791) += ad7791.o
>  obj-$(CONFIG_AD7793) += ad7793.o
>  obj-$(CONFIG_AD7887) += ad7887.o
>  obj-$(CONFIG_AT91_ADC) += at91_adc.o
> +obj-$(CONFIG_DA9058_ADC) += da9058-adc.o
>  obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
>  obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
>  obj-$(CONFIG_MAX1363) += max1363.o
> diff --git a/drivers/iio/adc/da9058-adc.c b/drivers/iio/adc/da9058-adc.c
> new file mode 100644
> index 0000000..872eaba
> --- /dev/null
> +++ b/drivers/iio/adc/da9058-adc.c
> @@ -0,0 +1,396 @@
> +/*
> + *  Copyright (C) 2012, 2013 Dialog Semiconductor Ltd.
> + *
> + *  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/module.h>
> +#include <linux/interrupt.h>
> +#include <linux/iio/iio.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/core.h>
> +
> +#include <linux/mfd/da9058/core.h>
> +#include <linux/mfd/da9058/registers.h>
> +#include <linux/mfd/da9058/irq.h>
> +#include <linux/mfd/da9058/pdata.h>
> +#include <linux/mfd/da9058/adc.h>
> +#include <linux/mfd/da9058/conf.h>
> +
> +struct da9058_adc {
> +	struct da9058 *da9058;
> +	struct platform_device *pdev;
> +	struct rtc_device *rtc_dev;
> +	int use_automatic_adc;
> +	int irq;
> +};
> +
> +/*
> + *  if the PMIC is in automatic ADC consersion mode we have the choice
> + *  of just getting the last (automatic) conversion or doing a manual
> + *  conversion anyway.
> + *
> + *  if the PMIC is not in automatic ADC consersion mode we have no choice
> + *  we just have to ignore the requested mode and just do a manual
> + *  ADC conversion.
> + */
> +static int da9058_automatic_adc_conversion(struct da9058 *da9058,
> +				const int channel, unsigned int *value)
> +{
> +	unsigned int adc_msh, adc_lsh;
> +	int ret;
> +
> +	switch (channel) {
> +	case DA9058_ADCMAN_MUXSEL_VBAT:
> +		ret = da9058_reg_read(da9058, DA9058_VBATRES_REG_MSB,
> +						&adc_msh);
> +		if (ret)
> +			return ret;
> +
> +		ret = da9058_reg_read(da9058, DA9058_AUTORES_REG_1,
> +					&adc_lsh);
> +		if (ret)
> +			return ret;
> +
> +		*value = (adc_lsh & 0x0F) | (adc_msh << 4);
> +
> +		return 0;
> +	case DA9058_ADCMAN_MUXSEL_TEMP:
> +		ret = da9058_reg_read(da9058, DA9058_TEMPRES_REG_MSB,
> +						&adc_msh);
> +		if (ret)
> +			return ret;
> +
> +		ret = da9058_reg_read(da9058, DA9058_AUTORES_REG_1,
> +					&adc_lsh);
> +		if (ret)
> +			return ret;
> +
> +		*value = (adc_lsh >> 4) | (adc_msh << 4);
> +
> +		return 0;
> +	case DA9058_ADCMAN_MUXSEL_VF:
> +		ret = da9058_reg_read(da9058, DA9058_VREF_REG,
> +					&adc_msh);
> +		if (ret)
> +			return ret;
> +
> +		ret = da9058_reg_read(da9058, DA9058_AUTORES_REG_2,
> +					&adc_lsh);
> +		if (ret)
> +			return ret;
> +
> +		*value = (adc_lsh & 0x0F) | (adc_msh << 4);
> +
> +		return 0;
> +	case DA9058_ADCMAN_MUXSEL_ADCIN:
> +		ret = da9058_reg_read(da9058, DA9058_ADCINRES_REG_MSB,
> +					&adc_msh);
> +		if (ret)
> +			return ret;
> +
> +		ret = da9058_reg_read(da9058, DA9058_AUTORES_REG_2,
> +					&adc_lsh);
> +		if (ret)
> +			return ret;
> +
> +		*value = (adc_lsh >> 4) | (adc_msh << 4);
> +
> +		return 0;
> +	case DA9058_ADCMAN_MUXSEL_TJUNC:
> +		ret = da9058_reg_read(da9058, DA9058_TJUNCRES_REG,
> +					&adc_msh);
> +		if (ret)
> +			return ret;
> +
> +		ret = da9058_reg_read(da9058, DA9058_AUTORES_REG_3,
> +					&adc_lsh);
> +		if (ret)
> +			return ret;
> +
> +		*value = (adc_lsh >> 4) | (adc_msh << 4);
> +
> +		return 0;
> +	default:
> +		dev_err(da9058->dev, "ADC Channel %d is reserved\n", channel);
> +		return -EIO;
> +	}
> +}
> +
> +static int da9058_manual_adc_conversion(struct da9058 *da9058,
> +				const int channel, unsigned int *value)
> +{
> +	unsigned int adc_msh, adc_lsh;
> +	int ret;
> +
> +	mutex_lock(&da9058->adc_mutex);
> +
> +	ret = da9058_reg_write(da9058, DA9058_ADCMAN_REG,
> +					DA9058_ADCMAN_MANCONV | channel);
> +	if (ret < 0)
> +		goto err;
> +
> +	if (!wait_for_completion_interruptible_timeout(&da9058->adc_read_done,
> +						msecs_to_jiffies(500))) {
> +		dev_err(da9058->dev,
> +			"timeout waiting for ADC conversion interrupt\n");
> +		ret = -ETIMEDOUT;
> +		goto err;
> +	}
> +
> +	ret = da9058_reg_read(da9058, DA9058_ADCRESH_REG, &adc_msh);
> +	if (ret < 0)
> +		goto err;
> +
> +	ret = da9058_reg_read(da9058, DA9058_ADCRESL_REG, &adc_lsh);
> +	if (ret < 0)
> +		goto err;
> +
> +	*value = (adc_msh << 4) | (adc_lsh & 0x0F);
> +
> +err:
> +	mutex_unlock(&da9058->adc_mutex);
> +	return ret;
> +}
> +
> +static int da9058_adc_conversion_read(struct da9058 *da9058, const int channel,
> +					int automatic_mode, unsigned int *value)
> +{
> +	if (!value)
> +		return -EINVAL;
> +
> +	if (automatic_mode) {
> +		unsigned int adc_ctrl;
> +		int ret;
> +
> +		ret = da9058_reg_read(da9058, DA9058_ADCCONT_REG, &adc_ctrl);
> +		if (ret)
> +			return ret;
> +
> +		if (adc_ctrl & DA9058_ADCCONT_AUTOADCEN)
> +			return da9058_automatic_adc_conversion(da9058,
> +						channel, value);
> +		else
> +			return da9058_manual_adc_conversion(da9058,
> +						channel, value);
> +	} else {
> +		return da9058_manual_adc_conversion(da9058, channel, value);
> +	}
> +}
> +
> +static irqreturn_t da9058_adc_interrupt(int irq, void *data)
> +{
> +	struct da9058 *da9058 = data;
> +
> +	complete(&da9058->adc_read_done);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int da9058_adc_read_raw(struct iio_dev *idev,
> +	struct iio_chan_spec const *chan, int *val, int *val2, long info)
> +{
> +	struct da9058_adc *adc = iio_priv(idev);
> +	struct da9058 *da9058 = adc->da9058;
> +	int ret;
> +
> +	switch (info) {
> +	case IIO_CHAN_INFO_RAW:
> +		ret = da9058_adc_conversion_read(da9058, chan->channel,
> +					adc->use_automatic_adc, val);
> +		if (ret)
> +			return ret;
> +		else
> +			return IIO_VAL_INT;
> +	default:
> +		return -EINVAL;
> +	};
> +}
> +
> +static const struct iio_info da9058_adc_info = {
> +	.driver_module = THIS_MODULE,
> +	.read_raw = &da9058_adc_read_raw,
> +};
> +
> +static const struct iio_chan_spec da9058_adc_channels[] = {
> +	{
> +		.type = IIO_VOLTAGE,
> +		.indexed = 1,
> +		.channel = 0,
> +		.scan_index = 0,
> +		.scan_type = {
> +			.sign = 'u',
> +			.realbits = 12,
> +			.storagebits = 16,
> +			},
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> +	},
> +	{
> +		.type = IIO_VOLTAGE,
> +		.indexed = 1,
> +		.channel = 1,
> +		.scan_index = 1,
> +		.scan_type = {
> +			.sign = 'u',
> +			.realbits = 12,
> +			.storagebits = 16,
> +			},
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> +	},
> +	{
> +		.type = IIO_VOLTAGE,
> +		.indexed = 1,
> +		.channel = 2,
> +		.scan_index = 2,
> +		.scan_type = {
> +			.sign = 'u',
> +			.realbits = 12,
> +			.storagebits = 16,
> +			},
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> +	},
> +	{
> +		.type = IIO_VOLTAGE,
> +		.indexed = 1,
> +		.channel = 3,
> +		.scan_index = 3,
> +		.scan_type = {
> +			.sign = 'u',
> +			.realbits = 12,
> +			.storagebits = 16,
> +			},
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> +	},
> +	{
> +		.type = IIO_VOLTAGE,
> +		.indexed = 1,
> +		.channel = 4,
> +		.scan_index = 4,
> +		.scan_type = {
> +			.sign = 'u',
> +			.realbits = 12,
> +			.storagebits = 16,
> +			},
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> +	},
> +
> +};
> +
> +static int da9058_adc_probe(struct platform_device *pdev)
> +{
> +	struct da9058 *da9058 = dev_get_drvdata(pdev->dev.parent);
> +	const struct mfd_cell *cell = mfd_get_cell(pdev);
> +	struct da9058_adc_pdata *adc_pdata;
> +	struct da9058_adc *adc;
> +	struct iio_dev *idev;
> +	int ret;
> +
> +	if (cell == NULL) {
> +		ret = -ENODEV;
> +		goto exit;
> +	}
> +
> +	if (da9058 == NULL) {
> +		ret = -ENODEV;
> +		goto exit;
> +	}
> +
> +	if (da9058->adc_read) {
> +		ret = -EEXIST;
> +		goto exit;
> +	}
> +
> +	adc_pdata = cell->platform_data;
> +
> +	if (adc_pdata == NULL) {
> +		ret = -EINVAL;
> +		goto exit;
> +	}
> +
> +	idev = iio_device_alloc(sizeof(struct da9058_adc));
> +	if (idev == NULL) {
> +		ret = -ENOMEM;
> +		goto error_ret;
> +	}
> +	adc = iio_priv(idev);
> +
> +	platform_set_drvdata(pdev, idev);
> +
> +	idev->dev.parent = &pdev->dev;
> +	idev->name = dev_name(&pdev->dev);
> +	idev->modes = INDIO_DIRECT_MODE;
> +	idev->info = &da9058_adc_info;
> +
> +	adc->irq = platform_get_irq(pdev, 0);
> +	if (adc->irq < 0) {
> +		dev_err(&pdev->dev, "cannot get ADC IRQ error=%d\n",
> +				adc->irq);
> +		ret = -ENODEV;
> +		goto error_free_device;
> +	}
> +
> +	idev->channels = da9058_adc_channels;
> +	idev->num_channels = ARRAY_SIZE(da9058_adc_channels);
> +	idev->masklength = ARRAY_SIZE(da9058_adc_channels);
> +
> +	platform_set_drvdata(pdev, adc);
> +	adc->da9058 = da9058;
> +	adc->pdev = pdev;
> +	adc->use_automatic_adc = adc_pdata->use_automatic_adc;
> +	da9058->adc_read = da9058_adc_conversion_read;
> +
> +	ret = iio_device_register(idev);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "Couldn't register the device, error=%d\n",
> +			ret);
> +		goto error_free_device;
> +	}
> +
> +	ret = devm_request_threaded_irq(&pdev->dev,
> +				da9058_to_virt_irq_num(da9058, adc->irq),
> +				NULL, da9058_adc_interrupt,
> +				IRQF_TRIGGER_RISING | IRQF_ONESHOT,
> +				"DA9058 ADC EOM", da9058);
> +	if (ret)
> +		goto failed_to_get_adc_interrupt;
> +
> +	goto exit;
> +
> +failed_to_get_adc_interrupt:
> +	iio_device_unregister(idev);
> +error_free_device:
> +	iio_device_free(idev);
> +exit:
> +error_ret:
> +	return ret;
> +}
> +
> +static int da9058_adc_remove(struct platform_device *pdev)
> +{
> +	struct iio_dev *idev = platform_get_drvdata(pdev);
> +
> +	iio_device_unregister(idev);
> +	iio_device_free(idev);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver da9058_adc_driver = {
> +	.probe = da9058_adc_probe,
> +	.remove = da9058_adc_remove,
> +	.driver = {
> +		.name = "da9058-adc",
> +		.owner = THIS_MODULE,
> +	},
> +};
> +
> +module_platform_driver(da9058_adc_driver);
> +
> +MODULE_DESCRIPTION("Dialog DA9058 PMIC Analogue to Digial Converter Driver");
> +MODULE_AUTHOR("Anthony Olech <Anthony.Olech@...semi.com>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:da9058-adc");

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