Re: [PATCH v8 3/8] drivers:input:tsc2007: add iio interface to read external ADC input and temperature
From: Jonathan Cameron
Date: Sun Nov 27 2016 - 06:03:02 EST
On 24/11/16 18:05, H. Nikolaus Schaller wrote:
>
>> Am 24.11.2016 um 18:38 schrieb Jonathan Cameron <jic23@xxxxxxxxxxxxxxxxxxxxx>:
>>
>>
>>
>> On 22 November 2016 14:02:30 GMT+00:00, "H. Nikolaus Schaller" <hns@xxxxxxxxxxxxx> wrote:
>>> The tsc2007 chip not only has a resistive touch screen controller but
>>> also an external AUX adc imput which can be used for an ambient
>>> light sensor, battery voltage monitoring or any general purpose.
>>>
>>> Additionally it can measure the chip temperature.
>>>
>>> This extension provides an iio interface for these adc channels.
>>>
>>> Since it is not wasting much resources and is very straightforward,
>>> we simply provide all other adc channels as optional iio interfaces
>>> as weel. This can be used for debugging or special applications.
>>>
>>> This patch also splits the tsc2007 driver in several source files:
>>> tsc2007.h -- constants, structs and stubs
>>> tsc2007_core.c -- functional parts of the original driver
>>> tsc2007_iio.c -- the optional iio stuff
>>>
>>> Makefile magic allows to conditionally link the iio stuff
>>> if CONFIG_IIO=y or =m in a way that it works with
>>> CONFIG_TOUCHSCREEN_TSC2007=m.
>>>
>>> Signed-off-by: H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>
>>> Reviewed-by: Jonathan Cameron <jic23@xxxxxxxxxx>
>>> ---
>>> drivers/input/touchscreen/Makefile | 7 +
>>> drivers/input/touchscreen/tsc2007.h | 116
>>> ++++++++++++++++
>>> .../touchscreen/{tsc2007.c => tsc2007_core.c} | 95 +++----------
>>> drivers/input/touchscreen/tsc2007_iio.c | 150
>>> +++++++++++++++++++++
>>> 4 files changed, 294 insertions(+), 74 deletions(-)
>>> create mode 100644 drivers/input/touchscreen/tsc2007.h
>>> rename drivers/input/touchscreen/{tsc2007.c => tsc2007_core.c} (86%)
>>> create mode 100644 drivers/input/touchscreen/tsc2007_iio.c
>>>
>>> diff --git a/drivers/input/touchscreen/Makefile
>>> b/drivers/input/touchscreen/Makefile
>>> index 81b8645..3be0d19 100644
>>> --- a/drivers/input/touchscreen/Makefile
>>> +++ b/drivers/input/touchscreen/Makefile
>>> @@ -80,6 +80,13 @@ obj-$(CONFIG_TOUCHSCREEN_TSC_SERIO) += tsc40.o
>>> obj-$(CONFIG_TOUCHSCREEN_TSC200X_CORE) += tsc200x-core.o
>>> obj-$(CONFIG_TOUCHSCREEN_TSC2004) += tsc2004.o
>>> obj-$(CONFIG_TOUCHSCREEN_TSC2005) += tsc2005.o
>>> +tsc2007-y := tsc2007_core.o
>>> +ifeq ($(CONFIG_IIO),y)
>>> +tsc2007-y += tsc2007_iio.o
>>> +endif
>>> +ifeq ($(CONFIG_IIO),m)
>>> +tsc2007-y += tsc2007_iio.o
>>
>> Not tsc2007-m ?
>>
>> I don't follow how this works!
>
> I guess tsc2007-y is an internal collector variable name
> for multiple .o components. Sort of a "library" object.
>
> While
>
> obj-y += tsc2007.o adds it to the kernel
> obj-m += tsc2007.o adds it to the modules
>
> I am not sure if my explanation is correct but it appears
> to work that way.
>
> Anyways what shall we do? If CONFIG_TOUCHSCREEN_TSC2007=y
> and IIO=m we have a problem that we need dynamic binding.
Yes, we just need to block that particular combination. Only build in the IIO support
if it is also built in. That's way I thought we'd want to add it tsc2007-m which would
only be used if tsc2007 as a whole was built as a module.
Otherwise it would be ignored (I think!)
I'm not seeing this structure anywhere else in kernel - hence cc'd Yann and the Kbuild list
to see if they can offer some advices.
As a quick summary, we are looking to add IIO support to this driver in the following circumstances.
IIO and this driver are modules. (ideally handling the dependencies nicely)
IIO and this driver are both built in.
Problem case is driver built in and IIO as a module.
Jonathan
>
>>> +endif
>>> obj-$(CONFIG_TOUCHSCREEN_TSC2007) += tsc2007.o
>>> obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o
>>> obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001) += wacom_w8001.o
>>> diff --git a/drivers/input/touchscreen/tsc2007.h
>>> b/drivers/input/touchscreen/tsc2007.h
>>> new file mode 100644
>>> index 0000000..c25932f
>>> --- /dev/null
>>> +++ b/drivers/input/touchscreen/tsc2007.h
>>> @@ -0,0 +1,116 @@
>>> +/*
>>> + * Copyright (c) 2008 MtekVision Co., Ltd.
>>> + * Kwangwoo Lee <kwlee@xxxxxxxxxxxxxx>
>>> + *
>>> + * Using code from:
>>> + * - ads7846.c
>>> + * Copyright (c) 2005 David Brownell
>>> + * Copyright (c) 2006 Nokia Corporation
>>> + * - corgi_ts.c
>>> + * Copyright (C) 2004-2005 Richard Purdie
>>> + * - omap_ts.[hc], ads7846.h, ts_osk.c
>>> + * Copyright (C) 2002 MontaVista Software
>>> + * Copyright (C) 2004 Texas Instruments
>>> + * Copyright (C) 2005 Dirk Behme
>>> + *
>>> + * This program is free software; you can redistribute it and/or
>>> modify
>>> + * it under the terms of the GNU General Public License version 2 as
>>> + * published by the Free Software Foundation.
>>> + */
>>> +
>>> +#include <linux/input/touchscreen.h>
>>> +
>>> +#define TSC2007_MEASURE_TEMP0 (0x0 << 4)
>>> +#define TSC2007_MEASURE_AUX (0x2 << 4)
>>> +#define TSC2007_MEASURE_TEMP1 (0x4 << 4)
>>> +#define TSC2007_ACTIVATE_XN (0x8 << 4)
>>> +#define TSC2007_ACTIVATE_YN (0x9 << 4)
>>> +#define TSC2007_ACTIVATE_YP_XN (0xa << 4)
>>> +#define TSC2007_SETUP (0xb << 4)
>>> +#define TSC2007_MEASURE_X (0xc << 4)
>>> +#define TSC2007_MEASURE_Y (0xd << 4)
>>> +#define TSC2007_MEASURE_Z1 (0xe << 4)
>>> +#define TSC2007_MEASURE_Z2 (0xf << 4)
>>> +
>>> +#define TSC2007_POWER_OFF_IRQ_EN (0x0 << 2)
>>> +#define TSC2007_ADC_ON_IRQ_DIS0 (0x1 << 2)
>>> +#define TSC2007_ADC_OFF_IRQ_EN (0x2 << 2)
>>> +#define TSC2007_ADC_ON_IRQ_DIS1 (0x3 << 2)
>>> +
>>> +#define TSC2007_12BIT (0x0 << 1)
>>> +#define TSC2007_8BIT (0x1 << 1)
>>> +
>>> +#define MAX_12BIT ((1 << 12) - 1)
>>> +
>>> +#define ADC_ON_12BIT (TSC2007_12BIT | TSC2007_ADC_ON_IRQ_DIS0)
>>> +
>>> +#define READ_Y (ADC_ON_12BIT | TSC2007_MEASURE_Y)
>>> +#define READ_Z1 (ADC_ON_12BIT | TSC2007_MEASURE_Z1)
>>> +#define READ_Z2 (ADC_ON_12BIT | TSC2007_MEASURE_Z2)
>>> +#define READ_X (ADC_ON_12BIT | TSC2007_MEASURE_X)
>>> +#define PWRDOWN (TSC2007_12BIT | TSC2007_POWER_OFF_IRQ_EN)
>>> +
>>> +struct ts_event {
>>> + u16 x;
>>> + u16 y;
>>> + u16 z1, z2;
>>> +};
>>> +
>>> +struct tsc2007 {
>>> + struct input_dev *input;
>>> + char phys[32];
>>> +
>>> + struct i2c_client *client;
>>> +
>>> + u16 model;
>>> + u16 x_plate_ohms;
>>> +
>>> + struct touchscreen_properties prop;
>>> +
>>> + bool report_resistance;
>>> + u16 min_x;
>>> + u16 min_y;
>>> + u16 max_x;
>>> + u16 max_y;
>>> + u16 max_rt;
>>> + unsigned long poll_period; /* in jiffies */
>>> + int fuzzx;
>>> + int fuzzy;
>>> + int fuzzz;
>>> +
>>> + unsigned int gpio;
>>> + int irq;
>>> +
>>> + wait_queue_head_t wait;
>>> + bool stopped;
>>> + bool pendown;
>>> +
>>> + int (*get_pendown_state)(struct device *);
>>> + void (*clear_penirq)(void);
>>> +
>>> + struct mutex mlock;
>>> + struct iio_dev *iio_dev; /* optional */
>>> +};
>>> +
>>> +int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd);
>>> +u32 tsc2007_calculate_resistance(struct tsc2007 *tsc,
>>> + struct ts_event *tc);
>>> +bool tsc2007_is_pen_down(struct tsc2007 *ts);
>>> +
>>> +#if IS_ENABLED(CONFIG_IIO)
>>> +
>>> +/* defined in tsc2007_iio.c */
>>> +int tsc2007_iio_configure(struct tsc2007 *ts);
>>> +void tsc2007_iio_unconfigure(struct tsc2007 *ts);
>>> +
>>> +#else /* CONFIG_IIO */
>>> +
>>> +static inline int tsc2007_iio_configure(struct tsc2007 *ts)
>>> +{
>>> + return 0;
>>> +}
>>> +static inline void tsc2007_iio_unconfigure(struct tsc2007 *ts)
>>> +{
>>> +}
>>> +
>>> +#endif /* CONFIG_IIO */
>>> diff --git a/drivers/input/touchscreen/tsc2007.c
>>> b/drivers/input/touchscreen/tsc2007_core.c
>>> similarity index 86%
>>> rename from drivers/input/touchscreen/tsc2007.c
>>> rename to drivers/input/touchscreen/tsc2007_core.c
>>> index 76b462b..812ded8 100644
>>> --- a/drivers/input/touchscreen/tsc2007.c
>>> +++ b/drivers/input/touchscreen/tsc2007_core.c
>>> @@ -27,79 +27,11 @@
>>> #include <linux/i2c.h>
>>> #include <linux/i2c/tsc2007.h>
>>> #include <linux/of_device.h>
>>> -#include <linux/of.h>
>>> #include <linux/of_gpio.h>
>>> -#include <linux/input/touchscreen.h>
>>> -
>>> -#define TSC2007_MEASURE_TEMP0 (0x0 << 4)
>>> -#define TSC2007_MEASURE_AUX (0x2 << 4)
>>> -#define TSC2007_MEASURE_TEMP1 (0x4 << 4)
>>> -#define TSC2007_ACTIVATE_XN (0x8 << 4)
>>> -#define TSC2007_ACTIVATE_YN (0x9 << 4)
>>> -#define TSC2007_ACTIVATE_YP_XN (0xa << 4)
>>> -#define TSC2007_SETUP (0xb << 4)
>>> -#define TSC2007_MEASURE_X (0xc << 4)
>>> -#define TSC2007_MEASURE_Y (0xd << 4)
>>> -#define TSC2007_MEASURE_Z1 (0xe << 4)
>>> -#define TSC2007_MEASURE_Z2 (0xf << 4)
>>> -
>>> -#define TSC2007_POWER_OFF_IRQ_EN (0x0 << 2)
>>> -#define TSC2007_ADC_ON_IRQ_DIS0 (0x1 << 2)
>>> -#define TSC2007_ADC_OFF_IRQ_EN (0x2 << 2)
>>> -#define TSC2007_ADC_ON_IRQ_DIS1 (0x3 << 2)
>>> -
>>> -#define TSC2007_12BIT (0x0 << 1)
>>> -#define TSC2007_8BIT (0x1 << 1)
>>> -
>>> -#define MAX_12BIT ((1 << 12) - 1)
>>> -
>>> -#define ADC_ON_12BIT (TSC2007_12BIT | TSC2007_ADC_ON_IRQ_DIS0)
>>> -
>>> -#define READ_Y (ADC_ON_12BIT | TSC2007_MEASURE_Y)
>>> -#define READ_Z1 (ADC_ON_12BIT | TSC2007_MEASURE_Z1)
>>> -#define READ_Z2 (ADC_ON_12BIT | TSC2007_MEASURE_Z2)
>>> -#define READ_X (ADC_ON_12BIT | TSC2007_MEASURE_X)
>>> -#define PWRDOWN (TSC2007_12BIT | TSC2007_POWER_OFF_IRQ_EN)
>>> -
>>> -struct ts_event {
>>> - u16 x;
>>> - u16 y;
>>> - u16 z1, z2;
>>> -};
>>> -
>>> -struct tsc2007 {
>>> - struct input_dev *input;
>>> - char phys[32];
>>> -
>>> - struct i2c_client *client;
>>> -
>>> - u16 model;
>>> - u16 x_plate_ohms;
>>> -
>>> - struct touchscreen_properties prop;
>>> -
>>> - bool report_resistance;
>>> - u16 min_x;
>>> - u16 min_y;
>>> - u16 max_x;
>>> - u16 max_y;
>>> - u16 max_rt;
>>> - unsigned long poll_period; /* in jiffies */
>>> - int fuzzx;
>>> - int fuzzy;
>>> - int fuzzz;
>>> -
>>> - unsigned gpio;
>>> - int irq;
>>> -
>>> - wait_queue_head_t wait;
>>> - bool stopped;
>>> +#include "tsc2007.h"
>>>
>>> - int (*get_pendown_state)(struct device *);
>>> - void (*clear_penirq)(void);
>>> -};
>>>
>>> -static inline int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd)
>>> +int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd)
>>> {
>>> s32 data;
>>> u16 val;
>>> @@ -137,7 +69,7 @@ static void tsc2007_read_values(struct tsc2007 *tsc,
>>> struct ts_event *tc)
>>> tsc2007_xfer(tsc, PWRDOWN);
>>> }
>>>
>>> -static u32 tsc2007_calculate_resistance(struct tsc2007 *tsc,
>>> +u32 tsc2007_calculate_resistance(struct tsc2007 *tsc,
>>> struct ts_event *tc)
>>> {
>>> u32 rt = 0;
>>> @@ -158,7 +90,7 @@ static u32 tsc2007_calculate_resistance(struct
>>> tsc2007 *tsc,
>>> return rt;
>>> }
>>>
>>> -static bool tsc2007_is_pen_down(struct tsc2007 *ts)
>>> +bool tsc2007_is_pen_down(struct tsc2007 *ts)
>>> {
>>> /*
>>> * NOTE: We can't rely on the pressure to determine the pen down
>>> @@ -191,7 +123,10 @@ static irqreturn_t tsc2007_soft_irq(int irq, void
>>> *handle)
>>> while (!ts->stopped && tsc2007_is_pen_down(ts)) {
>>>
>>> /* pen is down, continue with the measurement */
>>> +
>>> + mutex_lock(&ts->mlock);
>>> tsc2007_read_values(ts, &tc);
>>> + mutex_unlock(&ts->mlock);
>>>
>>> rt = tsc2007_calculate_resistance(ts, &tc);
>>>
>>> @@ -441,7 +376,8 @@ static void tsc2007_call_exit_platform_hw(void
>>> *data)
>>> static int tsc2007_probe(struct i2c_client *client,
>>> const struct i2c_device_id *id)
>>> {
>>> - const struct tsc2007_platform_data *pdata =
>>> dev_get_platdata(&client->dev);
>>> + const struct tsc2007_platform_data *pdata =
>>> + dev_get_platdata(&client->dev);
>>> struct tsc2007 *ts;
>>> struct input_dev *input_dev;
>>> int err;
>>> @@ -463,7 +399,9 @@ static int tsc2007_probe(struct i2c_client *client,
>>> ts->client = client;
>>> ts->irq = client->irq;
>>> ts->input = input_dev;
>>> +
>>> init_waitqueue_head(&ts->wait);
>>> + mutex_init(&ts->mlock);
>>>
>>> snprintf(ts->phys, sizeof(ts->phys),
>>> "%s/input0", dev_name(&client->dev));
>>> @@ -534,7 +472,7 @@ static int tsc2007_probe(struct i2c_client *client,
>>> if (err < 0) {
>>> dev_err(&client->dev,
>>> "Failed to setup chip: %d\n", err);
>>> - return err; /* usually, chip does not respond */
>>> + return err; /* chip does not respond */
>>> }
>>>
>>> err = input_register_device(input_dev);
>>> @@ -544,6 +482,14 @@ static int tsc2007_probe(struct i2c_client
>>> *client,
>>> return err;
>>> }
>>>
>>> + return tsc2007_iio_configure(ts);
>>> +}
>>> +
>>> +static int tsc2007_remove(struct i2c_client *client)
>>> +{
>>> + struct tsc2007 *ts = i2c_get_clientdata(client);
>>> +
>>> + tsc2007_iio_unconfigure(ts);
>>> return 0;
>>> }
>>>
>>> @@ -569,6 +515,7 @@ static struct i2c_driver tsc2007_driver = {
>>> },
>>> .id_table = tsc2007_idtable,
>>> .probe = tsc2007_probe,
>>> + .remove = tsc2007_remove,
>>> };
>>>
>>> module_i2c_driver(tsc2007_driver);
>>> diff --git a/drivers/input/touchscreen/tsc2007_iio.c
>>> b/drivers/input/touchscreen/tsc2007_iio.c
>>> new file mode 100644
>>> index 0000000..ed79944
>>> --- /dev/null
>>> +++ b/drivers/input/touchscreen/tsc2007_iio.c
>>> @@ -0,0 +1,150 @@
>>> +/*
>>> + * Copyright (c) 2016 Golden Delicious Comp. GmbH&Co. KG
>>> + * Nikolaus Schaller <hns@xxxxxxxxxxxxx>
>>> + *
>>> + * This program is free software; you can redistribute it and/or
>>> modify
>>> + * it under the terms of the GNU General Public License version 2 as
>>> + * published by the Free Software Foundation.
>>> + */
>>> +
>>> +#include <linux/i2c.h>
>>> +#include <linux/iio/iio.h>
>>> +#include "tsc2007.h"
>>> +
>>> +struct tsc2007_iio {
>>> + struct tsc2007 *ts;
>>> +};
>>> +
>>> +#define TSC2007_CHAN_IIO(_chan, _name, _type, _chan_info) \
>>> +{ \
>>> + .datasheet_name = _name, \
>>> + .type = _type, \
>>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
>>> + BIT(_chan_info), \
>>> + .indexed = 1, \
>>> + .channel = _chan, \
>>> +}
>>> +
>>> +static const struct iio_chan_spec tsc2007_iio_channel[] = {
>>> + TSC2007_CHAN_IIO(0, "x", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
>>> + TSC2007_CHAN_IIO(1, "y", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
>>> + TSC2007_CHAN_IIO(2, "z1", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
>>> + TSC2007_CHAN_IIO(3, "z2", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
>>> + TSC2007_CHAN_IIO(4, "adc", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
>>> + TSC2007_CHAN_IIO(5, "rt", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), /* Ohms?
>>> */
>>> + TSC2007_CHAN_IIO(6, "pen", IIO_PRESSURE, IIO_CHAN_INFO_RAW),
>>> + TSC2007_CHAN_IIO(7, "temp0", IIO_TEMP, IIO_CHAN_INFO_RAW),
>>> + TSC2007_CHAN_IIO(8, "temp1", IIO_TEMP, IIO_CHAN_INFO_RAW),
>>> +};
>>> +
>>> +static int tsc2007_read_raw(struct iio_dev *indio_dev,
>>> + struct iio_chan_spec const *chan, int *val, int *val2, long mask)
>>> +{
>>> + struct tsc2007_iio *iio = iio_priv(indio_dev);
>>> + struct tsc2007 *tsc = iio->ts;
>>> + int adc_chan = chan->channel;
>>> + int ret = 0;
>>> +
>>> + if (adc_chan >= ARRAY_SIZE(tsc2007_iio_channel))
>>> + return -EINVAL;
>>> +
>>> + if (mask != IIO_CHAN_INFO_RAW)
>>> + return -EINVAL;
>>> +
>>> + mutex_lock(&tsc->mlock);
>>> +
>>> + switch (chan->channel) {
>>> + case 0:
>>> + *val = tsc2007_xfer(tsc, READ_X);
>>> + break;
>>> + case 1:
>>> + *val = tsc2007_xfer(tsc, READ_Y);
>>> + break;
>>> + case 2:
>>> + *val = tsc2007_xfer(tsc, READ_Z1);
>>> + break;
>>> + case 3:
>>> + *val = tsc2007_xfer(tsc, READ_Z2);
>>> + break;
>>> + case 4:
>>> + *val = tsc2007_xfer(tsc, (ADC_ON_12BIT | TSC2007_MEASURE_AUX));
>>> + break;
>>> + case 5: {
>>> + struct ts_event tc;
>>> +
>>> + tc.x = tsc2007_xfer(tsc, READ_X);
>>> + tc.z1 = tsc2007_xfer(tsc, READ_Z1);
>>> + tc.z2 = tsc2007_xfer(tsc, READ_Z2);
>>> + *val = tsc2007_calculate_resistance(tsc, &tc);
>>> + break;
>>> + }
>>> + case 6:
>>> + *val = tsc2007_is_pen_down(tsc);
>>> + break;
>>> + case 7:
>>> + *val = tsc2007_xfer(tsc,
>>> + (ADC_ON_12BIT | TSC2007_MEASURE_TEMP0));
>>> + break;
>>> + case 8:
>>> + *val = tsc2007_xfer(tsc,
>>> + (ADC_ON_12BIT | TSC2007_MEASURE_TEMP1));
>>> + break;
>>> + }
>>> +
>>> + /* Prepare for next touch reading - power down ADC, enable PENIRQ */
>>> + tsc2007_xfer(tsc, PWRDOWN);
>>> +
>>> + mutex_unlock(&tsc->mlock);
>>> +
>>> + ret = IIO_VAL_INT;
>>> +
>>> + return ret;
>>> +}
>>> +
>>> +static const struct iio_info tsc2007_iio_info = {
>>> + .read_raw = tsc2007_read_raw,
>>> + .driver_module = THIS_MODULE,
>>> +};
>>> +
>>> +int tsc2007_iio_configure(struct tsc2007 *ts)
>>> +{
>>> + int err;
>>> + struct iio_dev *indio_dev;
>>> + struct tsc2007_iio *iio;
>>> +
>>> + indio_dev = devm_iio_device_alloc(&ts->client->dev,
>>> + sizeof(struct tsc2007_iio));
>>> + if (!indio_dev) {
>>> + dev_err(&ts->client->dev, "iio_device_alloc failed\n");
>>> + return -ENOMEM;
>>> + }
>>> +
>>> + iio = iio_priv(indio_dev);
>>> + iio->ts = ts;
>>> + ts->iio_dev = (void *) indio_dev;
>>> +
>>> + indio_dev->name = "tsc2007";
>>> + indio_dev->dev.parent = &ts->client->dev;
>>> + indio_dev->info = &tsc2007_iio_info;
>>> + indio_dev->modes = INDIO_DIRECT_MODE;
>>> + indio_dev->channels = tsc2007_iio_channel;
>>> + indio_dev->num_channels = ARRAY_SIZE(tsc2007_iio_channel);
>>> +
>>> + err = iio_device_register(indio_dev);
>>> + if (err < 0) {
>>> + dev_err(&ts->client->dev, "iio_device_register() failed: %d\n",
>>> + err);
>>> + return err;
>>> + }
>>> +
>>> + return 0;
>>> +}
>>> +EXPORT_SYMBOL(tsc2007_iio_configure);
>>> +
>>> +void tsc2007_iio_unconfigure(struct tsc2007 *ts)
>>> +{
>>> + struct iio_dev *indio_dev = ts->iio_dev;
>>> +
>>> + iio_device_unregister(indio_dev);
>>> +}
>>> +EXPORT_SYMBOL(tsc2007_iio_unconfigure);
>>
>> --
>> Sent from my Android device with K-9 Mail. Please excuse my brevity.
>