Re: [PATCH v7 4/9] drivers:input:tsc2007: add iio interface to read external ADC input and temperature

From: Dmitry Torokhov
Date: Sat Nov 19 2016 - 13:38:59 EST

On Sat, Nov 12, 2016 at 02:19:30PM +0000, Jonathan Cameron wrote:
> On 12/11/16 14:04, Jonathan Cameron wrote:
> > On 11/11/16 19:02, H. Nikolaus Schaller 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 in a way that it works with
> >> CONFIG_TOUCHSCREEN_TSC2007=m.
> >>
> >
> > I ran a quick build test and it blows up in a number of ways related to
> > the #ifdef CONFIG_IIO.
> >
> > I'm not entirely sure why but
> > #if IS_ENABLED(CONFIG_IIO) works fine.
> Ah, I'm being sleepy today. It's because I'm building IIO as a module
> and the symbol defined would therefore be CONFIG_IIO_MODULE.
>
> The IS_ENABLED macro takes care of both cases.

No it doesn't. Have you tried building the driver into the kernel with
IIO as a module?

> >
> > Otherwise looks good to me
> >> Signed-off-by: H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>
> > Reviewed-by: Jonathan Cameron <jic23@xxxxxxxxxx>
> >> ---
> >> drivers/input/touchscreen/Makefile | 2 +
> >> drivers/input/touchscreen/tsc2007.h | 118 ++++++++++++++++
> >> .../touchscreen/{tsc2007.c => tsc2007_core.c} | 119 ++++++----------
> >> drivers/input/touchscreen/tsc2007_iio.c | 152 +++++++++++++++++++++
> >> 4 files changed, 310 insertions(+), 81 deletions(-)
> >> create mode 100644 drivers/input/touchscreen/tsc2007.h
> >> rename drivers/input/touchscreen/{tsc2007.c => tsc2007_core.c} (85%)
> >> create mode 100644 drivers/input/touchscreen/tsc2007_iio.c
> >>
> >> diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
> >> index 81b8645..d932e2d 100644
> >> --- a/drivers/input/touchscreen/Makefile
> >> +++ b/drivers/input/touchscreen/Makefile
> >> @@ -80,6 +80,8 @@ 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
> >> +tsc2007-$(CONFIG_IIO) += tsc2007_iio.o
> >> obj-$(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..5049bf8
> >> --- /dev/null
> >> +++ b/drivers/input/touchscreen/tsc2007.h
> >> @@ -0,0 +1,118 @@
> >> +/*
> >> + * drivers/input/touchscreen/tsc2007.h
> >> + *
> >> + * 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);
> >> +
> >> +#ifdef 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 85%
> >> rename from drivers/input/touchscreen/tsc2007.c
> >> rename to drivers/input/touchscreen/tsc2007_core.c
> >> index 5e3c4bf..72775ae 100644
> >> --- a/drivers/input/touchscreen/tsc2007.c
> >> +++ b/drivers/input/touchscreen/tsc2007_core.c
> >> @@ -27,80 +27,10 @@
> >> #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;
> >> +#include "tsc2007.h"
> >>
> >> - unsigned gpio;
> >> - int irq;
> >> -
> >> - wait_queue_head_t wait;
> >> - bool stopped;
> >> - bool pendown;
> >> -
> >> - 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;
> >> @@ -121,6 +51,7 @@ static inline int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd)
> >>
> >> return val;
> >> }
> >> +EXPORT_SYMBOL(tsc2007_xfer);
> >>
> >> static void tsc2007_read_values(struct tsc2007 *tsc, struct ts_event *tc)
> >> {
> >> @@ -138,7 +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;
> >> @@ -158,8 +89,9 @@ static u32 tsc2007_calculate_resistance(struct tsc2007 *tsc,
> >>
> >> return rt;
> >> }
> >> +EXPORT_SYMBOL(tsc2007_calculate_resistance);
> >>
> >> -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
> >> @@ -180,6 +112,7 @@ static bool tsc2007_is_pen_down(struct tsc2007 *ts)
> >>
> >> return ts->get_pendown_state(&ts->client->dev);
> >> }
> >> +EXPORT_SYMBOL(tsc2007_is_pen_down);
> >>
> >> static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
> >> {
> >> @@ -192,7 +125,10 @@ 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);
> >>
> >> @@ -450,7 +386,8 @@ 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;
> >> @@ -472,7 +409,13 @@ static int tsc2007_probe(struct i2c_client *client,
> >> ts->client = client;
> >> ts->irq = client->irq;
> >> ts->input = input_dev;
> >> +
> >> + err = tsc2007_iio_configure(ts);
> >> + if (err < 0)
> >> + return err;
> >> +
> >> init_waitqueue_head(&ts->wait);
> >> + mutex_init(&ts->mlock);
> >>
> >> snprintf(ts->phys, sizeof(ts->phys),
> >> "%s/input0", dev_name(&client->dev));
> >> @@ -494,7 +437,7 @@ static int tsc2007_probe(struct i2c_client *client,
> >> if (pdata) {
> >> err = tsc2007_probe_pdev(client, ts, pdata, id);
> >> if (err)
> >> - return err;
> >> + goto probe_err;
> >> input_set_abs_params(input_dev, ABS_X, 0, ts->max_x-ts->min_x,
> >> ts->fuzzx, 0);
> >> input_set_abs_params(input_dev, ABS_Y, 0, ts->max_y-ts->min_y,
> >> @@ -504,7 +447,7 @@ static int tsc2007_probe(struct i2c_client *client,
> >> } else {
> >> err = tsc2007_probe_dt(client, ts);
> >> if (err)
> >> - return err;
> >> + goto probe_err;
> >> }
> >>
> >> if (pdata) {
> >> @@ -516,7 +459,7 @@ static int tsc2007_probe(struct i2c_client *client,
> >> dev_err(&client->dev,
> >> "Failed to register exit_platform_hw action, %d\n",
> >> err);
> >> - return err;
> >> + goto probe_err;
> >> }
> >> }
> >>
> >> @@ -533,7 +476,7 @@ static int tsc2007_probe(struct i2c_client *client,
> >> if (err) {
> >> dev_err(&client->dev, "Failed to request irq %d: %d\n",
> >> ts->irq, err);
> >> - return err;
> >> + goto probe_err;
> >> }
> >>
> >> tsc2007_stop(ts);
> >> @@ -543,17 +486,30 @@ 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 */
> >> + goto probe_err; /* chip does not respond */
> >> }
> >>
> >> err = input_register_device(input_dev);
> >> if (err) {
> >> dev_err(&client->dev,
> >> "Failed to register input device: %d\n", err);
> >> - return err;
> >> + goto probe_err;
> >> }
> >>
> >> return 0;
> >> +
> >> +probe_err:
> >> + tsc2007_iio_unconfigure(ts);
> >> + return err;
> >> +}
> >> +
> >> +static int tsc2007_remove(struct i2c_client *client)
> >> +{
> >> + struct tsc2007 *ts = i2c_get_clientdata(client);
> >> +
> >> + tsc2007_iio_unconfigure(ts);
> >> + input_unregister_device(ts->input);
> >> + return 0;
> >> }
> >>
> >> static const struct i2c_device_id tsc2007_idtable[] = {
> >> @@ -578,6 +534,7 @@ 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..e492bba
> >> --- /dev/null
> >> +++ b/drivers/input/touchscreen/tsc2007_iio.c
> >> @@ -0,0 +1,152 @@
> >> +/*
> >> + * drivers/input/touchscreen/tsc2007_iio.c
> >> + *
> >> + * 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);
> >>
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-iio" in
> > the body of a message to majordomo@xxxxxxxxxxxxxxx
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> >
>

--
Dmitry