Commit a9e340dc authored by Dmitry Torokhov's avatar Dmitry Torokhov
Browse files

Input: rotary_encoder - move away from platform data structure 



Drop support for platform data passed via a C-structure and switch to
device properties instead, which should make the driver compatible with all
platforms: OF, ACPI and static boards. Static boards should use property
sets to communicate device parameters to the driver.

Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 8631580f

arch/arm/mach-pxa/raumfeld.c

+21 −8
Original line number Diff line number Diff line
@@ -18,13 +18,13 @@ 


#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/property.h>

#include <linux/platform_device.h>

#include <linux/interrupt.h>

#include <linux/gpio.h>

#include <linux/gpio/machine.h>

#include <linux/smsc911x.h>

#include <linux/input.h>

#include <linux/rotary_encoder.h>

#include <linux/gpio_keys.h>

#include <linux/input/eeti_ts.h>

#include <linux/leds.h>
@@ -378,18 +378,27 @@ static struct gpiod_lookup_table raumfeld_rotary_gpios_table = { 
	},

};



static struct rotary_encoder_platform_data raumfeld_rotary_encoder_info = {

	.steps		= 24,

	.axis		= REL_X,

	.relative_axis	= 1,

static u32 raumfeld_rotary_encoder_steps = 24;

static u32 raumfeld_rotary_encoder_axis = REL_X;

static u32 raumfeld_rotary_encoder_relative_axis = 1;



static struct property_entry raumfeld_rotary_properties[] = {

	{ "rotary-encoder,steps-per-period",

		DEV_PROP_U32, 1, &raumfeld_rotary_encoder_steps, },

	{ "linux,axis",

		DEV_PROP_U32, 1, &raumfeld_rotary_encoder_axis, },

	{ "rotary-encoder,relative_axis",

		DEV_PROP_U32, 1, &raumfeld_rotary_encoder_relative_axis, },

	{ NULL }

};



static struct property_set raumfeld_rotary_property_set = {

	.properties = raumfeld_rotary_properties,

};



static struct platform_device rotary_encoder_device = {

	.name		= "rotary-encoder",

	.id		= 0,

	.dev		= {

		.platform_data = &raumfeld_rotary_encoder_info,

	}

};



/**
@@ -1061,6 +1070,8 @@ static void __init raumfeld_controller_init(void) 
	pxa3xx_mfp_config(ARRAY_AND_SIZE(raumfeld_controller_pin_config));



	gpiod_add_lookup_table(&raumfeld_rotary_gpios_table);

	device_add_property_set(&rotary_encoder_device.dev,

				&raumfeld_rotary_property_set);

	platform_device_register(&rotary_encoder_device);



	spi_register_board_info(ARRAY_AND_SIZE(controller_spi_devices));
@@ -1099,6 +1110,8 @@ static void __init raumfeld_speaker_init(void) 
	platform_device_register(&smc91x_device);



	gpiod_add_lookup_table(&raumfeld_rotary_gpios_table);

	device_add_property_set(&rotary_encoder_device.dev,

				&raumfeld_rotary_property_set);

	platform_device_register(&rotary_encoder_device);



	raumfeld_audio_init();

drivers/input/misc/rotary_encoder.c

+55 −91
Original line number Diff line number Diff line
@@ -21,20 +21,23 @@ 
#include <linux/device.h>

#include <linux/platform_device.h>

#include <linux/gpio/consumer.h>

#include <linux/rotary_encoder.h>

#include <linux/slab.h>

#include <linux/of.h>

#include <linux/of_platform.h>

#include <linux/pm.h>

#include <linux/property.h>



#define DRV_NAME "rotary-encoder"



struct rotary_encoder {

	struct input_dev *input;

	const struct rotary_encoder_platform_data *pdata;



	struct mutex access_mutex;



	unsigned int axis;

	u32 steps;

	u32 axis;

	bool relative_axis;

	bool rollover;



	unsigned int pos;



	struct gpio_desc *gpio_a;
@@ -59,31 +62,29 @@ static int rotary_encoder_get_state(struct rotary_encoder *encoder) 


static void rotary_encoder_report_event(struct rotary_encoder *encoder)

{

	const struct rotary_encoder_platform_data *pdata = encoder->pdata;



	if (pdata->relative_axis) {

	if (encoder->relative_axis) {

		input_report_rel(encoder->input,

				 pdata->axis, encoder->dir ? -1 : 1);

				 encoder->axis, encoder->dir ? -1 : 1);

	} else {

		unsigned int pos = encoder->pos;



		if (encoder->dir) {

			/* turning counter-clockwise */

			if (pdata->rollover)

				pos += pdata->steps;

			if (encoder->rollover)

				pos += encoder->steps;

			if (pos)

				pos--;

		} else {

			/* turning clockwise */

			if (pdata->rollover || pos < pdata->steps)

			if (encoder->rollover || pos < encoder->steps)

				pos++;

		}



		if (pdata->rollover)

			pos %= pdata->steps;

		if (encoder->rollover)

			pos %= encoder->steps;



		encoder->pos = pos;

		input_report_abs(encoder->input, pdata->axis, encoder->pos);

		input_report_abs(encoder->input, encoder->axis, encoder->pos);

	}



	input_sync(encoder->input);
@@ -204,90 +205,43 @@ out: 
	return IRQ_HANDLED;

}



#ifdef CONFIG_OF

static const struct of_device_id rotary_encoder_of_match[] = {

	{ .compatible = "rotary-encoder", },

	{ },

};

MODULE_DEVICE_TABLE(of, rotary_encoder_of_match);



static struct rotary_encoder_platform_data *rotary_encoder_parse_dt(struct device *dev)

{

	const struct of_device_id *of_id =

				of_match_device(rotary_encoder_of_match, dev);

	struct device_node *np = dev->of_node;

	struct rotary_encoder_platform_data *pdata;

	int error;



	if (!of_id || !np)

		return NULL;



	pdata = devm_kzalloc(dev, sizeof(struct rotary_encoder_platform_data),

			     GFP_KERNEL);

	if (!pdata)

		return ERR_PTR(-ENOMEM);



	of_property_read_u32(np, "rotary-encoder,steps", &pdata->steps);

	of_property_read_u32(np, "linux,axis", &pdata->axis);



	pdata->relative_axis =

		of_property_read_bool(np, "rotary-encoder,relative-axis");

	pdata->rollover = of_property_read_bool(np, "rotary-encoder,rollover");



	error = of_property_read_u32(np, "rotary-encoder,steps-per-period",

				     &pdata->steps_per_period);

	if (error) {

		/*

		 * The 'half-period' property has been deprecated, you must use

		 * 'steps-per-period' and set an appropriate value, but we still

		 * need to parse it to maintain compatibility.

		 */

		if (of_property_read_bool(np, "rotary-encoder,half-period")) {

			pdata->steps_per_period = 2;

		} else {

			/* Fallback to one step per period behavior */

			pdata->steps_per_period = 1;

		}

	}



	pdata->wakeup_source = of_property_read_bool(np, "wakeup-source");



	return pdata;

}

#else

static inline struct rotary_encoder_platform_data *

rotary_encoder_parse_dt(struct device *dev)

{

	return NULL;

}

#endif



static int rotary_encoder_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	const struct rotary_encoder_platform_data *pdata = dev_get_platdata(dev);

	struct rotary_encoder *encoder;

	struct input_dev *input;

	irq_handler_t handler;

	u32 steps_per_period;

	int err;



	if (!pdata) {

		pdata = rotary_encoder_parse_dt(dev);

		if (IS_ERR(pdata))

			return PTR_ERR(pdata);



		if (!pdata) {

			dev_err(dev, "missing platform data\n");

			return -EINVAL;

		}

	}



	encoder = devm_kzalloc(dev, sizeof(struct rotary_encoder), GFP_KERNEL);

	if (!encoder)

		return -ENOMEM;



	mutex_init(&encoder->access_mutex);

	encoder->pdata = pdata;



	device_property_read_u32(dev, "rotary-encoder,steps", &encoder->steps);



	err = device_property_read_u32(dev, "rotary-encoder,steps-per-period",

				       &steps_per_period);

	if (err) {

		/*

		 * The 'half-period' property has been deprecated, you must

		 * use 'steps-per-period' and set an appropriate value, but

		 * we still need to parse it to maintain compatibility. If

		 * neither property is present we fall back to the one step

		 * per period behavior.

		 */

		steps_per_period = device_property_read_bool(dev,

					"rotary-encoder,half-period") ? 2 : 1;

	}



	encoder->rollover =

		device_property_read_bool(dev, "rotary-encoder,rollover");



	device_property_read_u32(dev, "linux,axis", &encoder->axis);

	encoder->relative_axis =

		device_property_read_bool(dev, "rotary-encoder,relative-axis");



	encoder->gpio_a = devm_gpiod_get_index(dev, NULL, 0, GPIOD_IN);

	if (IS_ERR(encoder->gpio_a)) {
@@ -317,12 +271,13 @@ static int rotary_encoder_probe(struct platform_device *pdev) 
	input->id.bustype = BUS_HOST;

	input->dev.parent = dev;



	if (pdata->relative_axis)

		input_set_capability(input, EV_REL, pdata->axis);

	if (encoder->relative_axis)

		input_set_capability(input, EV_REL, encoder->axis);

	else

		input_set_abs_params(input, pdata->axis, 0, pdata->steps, 0, 1);

		input_set_abs_params(input,

				     encoder->axis, 0, encoder->steps, 0, 1);



	switch (pdata->steps_per_period) {

	switch (steps_per_period) {

	case 4:

		handler = &rotary_encoder_quarter_period_irq;

		encoder->last_stable = rotary_encoder_get_state(encoder);
@@ -336,7 +291,7 @@ static int rotary_encoder_probe(struct platform_device *pdev) 
		break;

	default:

		dev_err(dev, "'%d' is not a valid steps-per-period value\n",

			pdata->steps_per_period);

			steps_per_period);

		return -EINVAL;

	}
@@ -364,7 +319,8 @@ static int rotary_encoder_probe(struct platform_device *pdev) 
		return err;

	}



	device_init_wakeup(&pdev->dev, pdata->wakeup_source);

	device_init_wakeup(dev,

			   device_property_read_bool(dev, "wakeup-source"));



	platform_set_drvdata(pdev, encoder);
@@ -398,6 +354,14 @@ static int __maybe_unused rotary_encoder_resume(struct device *dev) 
static SIMPLE_DEV_PM_OPS(rotary_encoder_pm_ops,

			 rotary_encoder_suspend, rotary_encoder_resume);



#ifdef CONFIG_OF

static const struct of_device_id rotary_encoder_of_match[] = {

	{ .compatible = "rotary-encoder", },

	{ },

};

MODULE_DEVICE_TABLE(of, rotary_encoder_of_match);

#endif



static struct platform_driver rotary_encoder_driver = {

	.probe		= rotary_encoder_probe,

	.driver		= {

include/linux/rotary_encoder.h

deleted100644 → 0
+0 −13
Original line number Diff line number Diff line 
#ifndef __ROTARY_ENCODER_H__

#define __ROTARY_ENCODER_H__



struct rotary_encoder_platform_data {

	unsigned int steps;

	unsigned int axis;

	unsigned int steps_per_period;

	bool relative_axis;

	bool rollover;

	bool wakeup_source;

};



#endif /* __ROTARY_ENCODER_H__ */

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