Release 4.7 drivers/input/misc/soc_button_array.c

Directory: drivers/input/misc
/*
 * Supports for the button array on SoC tablets originally running
 * Windows 8.
 *
 * (C) Copyright 2014 Intel Corporation
 *
 * 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; version 2
 * of the License.
 */

#include <linux/module.h>
#include <linux/input.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio_keys.h>
#include <linux/platform_device.h>

/*
 * Definition of buttons on the tablet. The ACPI index of each button
 * is defined in section 2.8.7.2 of "Windows ACPI Design Guide for SoC
 * Platforms"
 */

#define MAX_NBUTTONS	5


struct soc_button_info {
	
const char *name;
	
int acpi_index;
	
unsigned int event_type;
	
unsigned int event_code;
	
bool autorepeat;
	
bool wakeup;
};

/*
 * Some of the buttons like volume up/down are auto repeat, while others
 * are not. To support both, we register two platform devices, and put
 * buttons into them based on whether the key should be auto repeat.
 */

#define BUTTON_TYPES	2


struct soc_button_data {
	
struct platform_device *children[BUTTON_TYPES];
};

/*
 * Get the Nth GPIO number from the ACPI object.
 */


static int soc_button_lookup_gpio(struct device *dev, int acpi_index)
{
	struct gpio_desc *desc;
	int gpio;

	desc = gpiod_get_index(dev, KBUILD_MODNAME, acpi_index, GPIOD_ASIS);
	if (IS_ERR(desc))
		return PTR_ERR(desc);

	gpio = desc_to_gpio(desc);

	gpiod_put(desc);

	return gpio;
}

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static struct platform_device *

soc_button_device_create(struct platform_device *pdev,
			 const struct soc_button_info *button_info,
			 bool autorepeat)
{
	const struct soc_button_info *info;
	struct platform_device *pd;
	struct gpio_keys_button *gpio_keys;
	struct gpio_keys_platform_data *gpio_keys_pdata;
	int n_buttons = 0;
	int gpio;
	int error;

	gpio_keys_pdata = devm_kzalloc(&pdev->dev,
				       sizeof(*gpio_keys_pdata) +
					sizeof(*gpio_keys) * MAX_NBUTTONS,
				       GFP_KERNEL);
	if (!gpio_keys_pdata)
		return ERR_PTR(-ENOMEM);

	gpio_keys = (void *)(gpio_keys_pdata + 1);

	for (info = button_info; info->name; info++) {
		if (info->autorepeat != autorepeat)
			continue;

		gpio = soc_button_lookup_gpio(&pdev->dev, info->acpi_index);
		if (gpio < 0)
			continue;

		gpio_keys[n_buttons].type = info->event_type;
		gpio_keys[n_buttons].code = info->event_code;
		gpio_keys[n_buttons].gpio = gpio;
		gpio_keys[n_buttons].active_low = 1;
		gpio_keys[n_buttons].desc = info->name;
		gpio_keys[n_buttons].wakeup = info->wakeup;
		n_buttons++;
	}

	if (n_buttons == 0) {
		error = -ENODEV;
		goto err_free_mem;
	}

	gpio_keys_pdata->buttons = gpio_keys;
	gpio_keys_pdata->nbuttons = n_buttons;
	gpio_keys_pdata->rep = autorepeat;

	pd = platform_device_alloc("gpio-keys", PLATFORM_DEVID_AUTO);
	if (!pd) {
		error = -ENOMEM;
		goto err_free_mem;
	}

	error = platform_device_add_data(pd, gpio_keys_pdata,
					 sizeof(*gpio_keys_pdata));
	if (error)
		goto err_free_pdev;

	error = platform_device_add(pd);
	if (error)
		goto err_free_pdev;

	return pd;

err_free_pdev:
	platform_device_put(pd);
err_free_mem:
	devm_kfree(&pdev->dev, gpio_keys_pdata);
	return ERR_PTR(error);
}

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Total 336 100.00% 3 100.00%



static int soc_button_remove(struct platform_device *pdev)
{
	struct soc_button_data *priv = platform_get_drvdata(pdev);

	int i;

	for (i = 0; i < BUTTON_TYPES; i++)
		if (priv->children[i])
			platform_device_unregister(priv->children[i]);

	return 0;
}

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Total 59 100.00% 2 100.00%



static int soc_button_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	const struct acpi_device_id *id;
	struct soc_button_info *button_info;
	struct soc_button_data *priv;
	struct platform_device *pd;
	int i;
	int error;

	id = acpi_match_device(dev->driver->acpi_match_table, dev);
	if (!id)
		return -ENODEV;

	button_info = (struct soc_button_info *)id->driver_data;

	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	platform_set_drvdata(pdev, priv);

	for (i = 0; i < BUTTON_TYPES; i++) {
		pd = soc_button_device_create(pdev, button_info, i == 0);
		if (IS_ERR(pd)) {
			error = PTR_ERR(pd);
			if (error != -ENODEV) {
				soc_button_remove(pdev);
				return error;
			}
			continue;
		}

		priv->children[i] = pd;
	}

	if (!priv->children[0] && !priv->children[1])
		return -ENODEV;

	return 0;
}

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Total 211 100.00% 3 100.00%


static struct soc_button_info soc_button_PNP0C40[] = {
	{ "power", 0, EV_KEY, KEY_POWER, false, true },
	{ "home", 1, EV_KEY, KEY_LEFTMETA, false, true },
	{ "volume_up", 2, EV_KEY, KEY_VOLUMEUP, true, false },
	{ "volume_down", 3, EV_KEY, KEY_VOLUMEDOWN, true, false },
	{ "rotation_lock", 4, EV_SW, SW_ROTATE_LOCK, false, false },
	{ }
};


static const struct acpi_device_id soc_button_acpi_match[] = {
	{ "PNP0C40", (unsigned long)soc_button_PNP0C40 },
	{ }
};

MODULE_DEVICE_TABLE(acpi, soc_button_acpi_match);


static struct platform_driver soc_button_driver = {
	.probe          = soc_button_probe,
	.remove		= soc_button_remove,
	.driver		= {
		.name = KBUILD_MODNAME,
		.acpi_match_table = ACPI_PTR(soc_button_acpi_match),
        },
};

module_platform_driver(soc_button_driver);

MODULE_LICENSE("GPL");
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alexandre courbot alexandre courbot 2 0.22% 1 16.67%
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Total 898 100.00% 6 100.00%
  Directory: drivers/input/misc

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
lejun zhu	lejun zhu	61	96.83%	1	50.00%
alexandre courbot	alexandre courbot	2	3.17%	1	50.00%
	Total	63	100.00%	2	100.00%
cregit-Linux how code gets into the kernel

Release 4.7 drivers/input/misc/soc_button_array.c

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