Thread (17 messages) 17 messages, 6 authors, 2016-11-19

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

From: Jonathan Cameron <hidden>
Date: 2016-11-19 20:10:08
Also in: linux-iio, linux-input, linux-omap, lkml 


On 19 November 2016 18:38:49 GMT+00:00, Dmitry Torokhov [off-list ref] wrote:
On Sat, Nov 12, 2016 at 02:19:30PM +0000, Jonathan Cameron wrote:
quoted
On 12/11/16 14:04, Jonathan Cameron wrote:
quoted
On 11/11/16 19:02, H. Nikolaus Schaller wrote:
quoted
The tsc2007 chip not only has a resistive touch screen controller
but
quoted
quoted
quoted
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,
quoted
quoted
quoted
we simply provide all other adc channels as optional iio
interfaces
quoted
quoted
quoted
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
quoted
quoted
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
quoted
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?
Fair point. Is there a clean way of handling this?
quoted
quoted
Otherwise looks good to me
quoted
Signed-off-by: H. Nikolaus Schaller <redacted>
Reviewed-by: Jonathan Cameron <redacted>
quoted
---
 drivers/input/touchscreen/Makefile                 |   2 +
 drivers/input/touchscreen/tsc2007.h                | 118
++++++++++++++++
quoted
quoted
quoted
 .../touchscreen/{tsc2007.c => tsc2007_core.c}      | 119
++++++----------
quoted
quoted
quoted
 drivers/input/touchscreen/tsc2007_iio.c            | 152
+++++++++++++++++++++
quoted
quoted
quoted
 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%)
quoted
quoted
quoted
 create mode 100644 drivers/input/touchscreen/tsc2007_iio.c

diff --git a/drivers/input/touchscreen/Makefile
b/drivers/input/touchscreen/Makefile
quoted
quoted
quoted
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
quoted
quoted
quoted
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-ec7hoAtq5SbSUeElwK9/Pw@public.gmane.org>
+ *
+ * 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
quoted
quoted
quoted
+ *  it under the terms of the GNU General Public License version
2 as
quoted
quoted
quoted
+ *  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
quoted
quoted
quoted
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)
quoted
quoted
quoted
 
 	return val;
 }
+EXPORT_SYMBOL(tsc2007_xfer);
 
 static void tsc2007_read_values(struct tsc2007 *tsc, struct
ts_event *tc)
quoted
quoted
quoted
 {
@@ -138,7 +69,7 @@ static void tsc2007_read_values(struct tsc2007
*tsc, struct ts_event *tc)
quoted
quoted
quoted
 	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,
quoted
quoted
quoted
 
 	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)
quoted
quoted
quoted
 
 	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)
quoted
quoted
quoted
 	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)
quoted
quoted
quoted
 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);
quoted
quoted
quoted
+	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,
quoted
quoted
quoted
 	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,
quoted
quoted
quoted
 	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,
quoted
quoted
quoted
 	} 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,
quoted
quoted
quoted
 				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,
quoted
quoted
quoted
 	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,
quoted
quoted
quoted
 	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
quoted
quoted
quoted
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-xXXSsgcRVICgSpxsJD1C4w@public.gmane.org>
+ *
+ *  This program is free software; you can redistribute it and/or
modify
quoted
quoted
quoted
+ *  it under the terms of the GNU General Public License version
2 as
quoted
quoted
quoted
+ *  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? */
quoted
quoted
quoted
+	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)
quoted
quoted
quoted
+{
+	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 */
quoted
quoted
quoted
+	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
quoted
quoted
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
  



    
  

  
    

      

        Keyboard shortcuts
      

      

        
          
hback out one level

          
jnext message in thread

          
kprevious message in thread

          
ldrill in

          
Escclose help / fold thread tree

          
?toggle this help