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Date: Mon, 05 Nov 2012 20:52:38 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Lars Poeschel <larsi@....tu-dresden.de>
CC: linus.walleij@...aro.org, poeschel@...onage.de,
sameo@...ux.intel.com, linux-kernel@...r.kernel.org,
jic23@....ac.uk, khali@...ux-fr.org, ben-linux@...ff.org,
w.sang@...gutronix.de, grant.likely@...retlab.ca,
linux-iio@...r.kernel.org
Subject: Re: [PATCH v3 5/5] iio: adc: add viperboard adc driver
On 11/05/2012 02:48 PM, Lars Poeschel wrote:
> From: Lars Poeschel <poeschel@...onage.de>
>
> This adds the mfd cell to use the adc part of the Nano River Technologies
> viperboard.
>
One utter nitpick inline (nice to clean up but totally trivial)
> Signed-off-by: Lars Poeschel <poeschel@...onage.de>
Acked-by: Jonathan Cameron <jic23@...nel.org>
As there is a clear dependence on the mfd elements here this should
probably go though Samuel's tree once people are happy with the other elements.
> ---
> drivers/iio/adc/Kconfig | 7 ++
> drivers/iio/adc/Makefile | 1 +
> drivers/iio/adc/viperboard_adc.c | 181 ++++++++++++++++++++++++++++++++++++++
> drivers/mfd/viperboard.c | 3 +
> include/linux/mfd/viperboard.h | 1 +
> 5 files changed, 193 insertions(+)
> create mode 100644 drivers/iio/adc/viperboard_adc.c
>
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 4927581..35ad77d 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -60,4 +60,11 @@ config LP8788_ADC
> help
> Say yes here to build support for TI LP8788 ADC.
>
> +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
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index 900995d..4852c2e 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -8,3 +8,4 @@ obj-$(CONFIG_AD7476) += ad7476.o
> obj-$(CONFIG_AD7791) += ad7791.o
> obj-$(CONFIG_AT91_ADC) += at91_adc.o
> obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
> +obj-$(CONFIG_VIPERBOARD_ADC) += viperboard_adc.o
> diff --git a/drivers/iio/adc/viperboard_adc.c b/drivers/iio/adc/viperboard_adc.c
> new file mode 100644
> index 0000000..58345c7
> --- /dev/null
> +++ b/drivers/iio/adc/viperboard_adc.c
> @@ -0,0 +1,181 @@
> +/*
> + * Nano River Technologies viperboard iio ADC driver
IIO (told you it was a nitpick).
> + *
> + * (C) 2012 by Lemonage GmbH
> + * Author: Lars Poeschel <poeschel@...onage.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(struct vprbrd_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@...onage.de>");
> +MODULE_DESCRIPTION("IIO ADC driver for Nano River Techs Viperboard");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:viperboard-adc");
> diff --git a/drivers/mfd/viperboard.c b/drivers/mfd/viperboard.c
> index a7b5b34..dacb3b7 100644
> --- a/drivers/mfd/viperboard.c
> +++ b/drivers/mfd/viperboard.c
> @@ -44,6 +44,9 @@ static struct mfd_cell vprbrd_devs[] = {
> {
> .name = "viperboard-i2c",
> },
> + {
> + .name = "viperboard-adc",
> + },
> };
>
> static int vprbrd_probe(struct usb_interface *interface,
> diff --git a/include/linux/mfd/viperboard.h b/include/linux/mfd/viperboard.h
> index ef78514..1934528 100644
> --- a/include/linux/mfd/viperboard.h
> +++ b/include/linux/mfd/viperboard.h
> @@ -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
>
>
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