iio: adc: Add viperboard adc driver (ffd8a6e7) · Commits · e / devices / android_kernel_fairphone_FP3

drivers/iio/adc/Kconfig

+7 −0

Original line number	Diff line number	Diff line
		@@ -67,4 +67,11 @@ config TI_AM335X_ADC
		Say yes here to build support for Texas Instruments ADC
		driver which is also a MFD client.

		config VIPERBOARD_ADC
		tristate "Viperboard ADC support"
		depends on MFD_VIPERBOARD && USB
		help
		Say yes here to access the ADC part of the Nano River
		Technologies Viperboard.

		endmenu

drivers/iio/adc/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -9,3 +9,4 @@ obj-$(CONFIG_AD7791) += ad7791.o
		obj-$(CONFIG_AT91_ADC) += at91_adc.o
		obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
		obj-$(CONFIG_TI_AM335X_ADC) += ti_am335x_adc.o
		obj-$(CONFIG_VIPERBOARD_ADC) += viperboard_adc.o
		No newline at end of file

drivers/iio/adc/viperboard_adc.c

0 → 100644

+181 −0

Original line number	Diff line number	Diff line
		/*
		* Nano River Technologies viperboard IIO ADC driver
		*
		* (C) 2012 by Lemonage GmbH
		* Author: Lars Poeschel <poeschel@lemonage.de>
		* All rights reserved.
		*
		* 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/errno.h>
		#include <linux/module.h>
		#include <linux/slab.h>
		#include <linux/types.h>
		#include <linux/mutex.h>
		#include <linux/platform_device.h>

		#include <linux/usb.h>
		#include <linux/iio/iio.h>

		#include <linux/mfd/viperboard.h>

		#define VPRBRD_ADC_CMD_GET 0x00

		struct vprbrd_adc_msg {
		u8 cmd;
		u8 chan;
		u8 val;
		} __packed;

		struct vprbrd_adc {
		struct vprbrd *vb;
		};

		#define VPRBRD_ADC_CHANNEL(_index) { \
		.type = IIO_VOLTAGE, \
		.indexed = 1, \
		.channel = _index, \
		.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT, \
		.scan_index = _index, \
		.scan_type = { \
		.sign = 'u', \
		.realbits = 8, \
		.storagebits = 8, \
		}, \
		}

		static struct iio_chan_spec const vprbrd_adc_iio_channels[] = {
		VPRBRD_ADC_CHANNEL(0),
		VPRBRD_ADC_CHANNEL(1),
		VPRBRD_ADC_CHANNEL(2),
		VPRBRD_ADC_CHANNEL(3),
		};

		static int vprbrd_iio_read_raw(struct iio_dev *iio_dev,
		struct iio_chan_spec const *chan,
		int *val,
		int *val2,
		long info)
		{
		int ret, error = 0;
		struct vprbrd_adc *adc = iio_priv(iio_dev);
		struct vprbrd *vb = adc->vb;
		struct vprbrd_adc_msg admsg = (struct vprbrd_adc_msg )vb->buf;

		switch (info) {
		case IIO_CHAN_INFO_RAW:
		mutex_lock(&vb->lock);

		admsg->cmd = VPRBRD_ADC_CMD_GET;
		admsg->chan = chan->scan_index;
		admsg->val = 0x00;

		ret = usb_control_msg(vb->usb_dev,
		usb_sndctrlpipe(vb->usb_dev, 0), VPRBRD_USB_REQUEST_ADC,
		VPRBRD_USB_TYPE_OUT, 0x0000, 0x0000, admsg,
		sizeof(struct vprbrd_adc_msg), VPRBRD_USB_TIMEOUT_MS);
		if (ret != sizeof(struct vprbrd_adc_msg)) {
		dev_err(&iio_dev->dev, "usb send error on adc read\n");
		error = -EREMOTEIO;
		}

		ret = usb_control_msg(vb->usb_dev,
		usb_rcvctrlpipe(vb->usb_dev, 0), VPRBRD_USB_REQUEST_ADC,
		VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, admsg,
		sizeof(struct vprbrd_adc_msg), VPRBRD_USB_TIMEOUT_MS);

		*val = admsg->val;

		mutex_unlock(&vb->lock);

		if (ret != sizeof(struct vprbrd_adc_msg)) {
		dev_err(&iio_dev->dev, "usb recv error on adc read\n");
		error = -EREMOTEIO;
		}

		if (error)
		goto error;

		return IIO_VAL_INT;
		default:
		error = -EINVAL;
		break;
		}
		error:
		return error;
		}

		static const struct iio_info vprbrd_adc_iio_info = {
		.read_raw = &vprbrd_iio_read_raw,
		.driver_module = THIS_MODULE,
		};

		static int __devinit vprbrd_adc_probe(struct platform_device *pdev)
		{
		struct vprbrd *vb = dev_get_drvdata(pdev->dev.parent);
		struct vprbrd_adc *adc;
		struct iio_dev *indio_dev;
		int ret;

		/* registering iio */
		indio_dev = iio_device_alloc(sizeof(*adc));
		if (!indio_dev) {
		dev_err(&pdev->dev, "failed allocating iio device\n");
		return -ENOMEM;
		}

		adc = iio_priv(indio_dev);
		adc->vb = vb;
		indio_dev->name = "viperboard adc";
		indio_dev->dev.parent = &pdev->dev;
		indio_dev->info = &vprbrd_adc_iio_info;
		indio_dev->modes = INDIO_DIRECT_MODE;
		indio_dev->channels = vprbrd_adc_iio_channels;
		indio_dev->num_channels = ARRAY_SIZE(vprbrd_adc_iio_channels);

		ret = iio_device_register(indio_dev);
		if (ret) {
		dev_err(&pdev->dev, "could not register iio (adc)");
		goto error;
		}

		platform_set_drvdata(pdev, indio_dev);

		return 0;

		error:
		iio_device_free(indio_dev);
		return ret;
		}

		static int __devexit vprbrd_adc_remove(struct platform_device *pdev)
		{
		struct iio_dev *indio_dev = platform_get_drvdata(pdev);

		iio_device_unregister(indio_dev);
		iio_device_free(indio_dev);

		return 0;
		}

		static struct platform_driver vprbrd_adc_driver = {
		.driver = {
		.name = "viperboard-adc",
		.owner = THIS_MODULE,
		},
		.probe = vprbrd_adc_probe,
		.remove = __devexit_p(vprbrd_adc_remove),
		};

		module_platform_driver(vprbrd_adc_driver);

		MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");
		MODULE_DESCRIPTION("IIO ADC driver for Nano River Techs Viperboard");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("platform:viperboard-adc");

drivers/mfd/viperboard.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -44,6 +44,9 @@ static struct mfd_cell vprbrd_devs[] = {
		{
		.name = "viperboard-i2c",
		},
		{
		.name = "viperboard-adc",
		},
		};

		static int vprbrd_probe(struct usb_interface *interface,

include/linux/mfd/viperboard.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -46,6 +46,7 @@
		#define VPRBRD_USB_REQUEST_I2C 0xe9
		#define VPRBRD_USB_REQUEST_MAJOR 0xea
		#define VPRBRD_USB_REQUEST_MINOR 0xeb
		#define VPRBRD_USB_REQUEST_ADC 0xec
		#define VPRBRD_USB_REQUEST_GPIOA 0xed
		#define VPRBRD_USB_REQUEST_GPIOB 0xdd