Input: add driver for AXP20x Power Enable Key (5b6c26a9) · Commits · e / devices / android_kernel_teracube_2e

Documentation/ABI/testing/sysfs-driver-input-axp-pek

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		What: /sys/class/input/input(x)/device/startup
		Date: March 2014
		Contact: Carlo Caione <carlo@caione.org>
		Description: Startup time in us. Board is powered on if the button is pressed
		for more than <startup_time>

		What: /sys/class/input/input(x)/device/shutdown
		Date: March 2014
		Contact: Carlo Caione <carlo@caione.org>
		Description: Shutdown time in us. Board is powered off if the button is pressed
		for more than <shutdown_time>

drivers/input/misc/Kconfig

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		@@ -426,6 +426,17 @@ config INPUT_TPS65218_PWRBUTTON
		To compile this driver as a module, choose M here. The module will
		be called tps65218-pwrbutton.

		config INPUT_AXP20X_PEK
		tristate "X-Powers AXP20X power button driver"
		depends on MFD_AXP20X
		help
		Say Y here if you want to enable power key reporting via the
		AXP20X PMIC.

		To compile this driver as a module, choose M here. The module will
		be called axp20x-pek.


		config INPUT_TWL4030_PWRBUTTON
		tristate "TWL4030 Power button Driver"
		depends on TWL4030_CORE

drivers/input/misc/Makefile

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		@@ -55,6 +55,7 @@ obj-$(CONFIG_INPUT_PWM_BEEPER) += pwm-beeper.o
		obj-$(CONFIG_INPUT_RB532_BUTTON) += rb532_button.o
		obj-$(CONFIG_INPUT_REGULATOR_HAPTIC) += regulator-haptic.o
		obj-$(CONFIG_INPUT_RETU_PWRBUTTON) += retu-pwrbutton.o
		obj-$(CONFIG_INPUT_AXP20X_PEK) += axp20x-pek.o
		obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o
		obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o
		obj-$(CONFIG_INPUT_SIRFSOC_ONKEY) += sirfsoc-onkey.o

drivers/input/misc/axp20x-pek.c

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		/*
		* axp20x power button driver.
		*
		* Copyright (C) 2013 Carlo Caione <carlo@caione.org>
		*
		* This file is subject to the terms and conditions of the GNU General
		* Public License. See the file "COPYING" in the main directory of this
		* archive for more details.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*/

		#include <linux/errno.h>
		#include <linux/irq.h>
		#include <linux/init.h>
		#include <linux/input.h>
		#include <linux/interrupt.h>
		#include <linux/kernel.h>
		#include <linux/mfd/axp20x.h>
		#include <linux/module.h>
		#include <linux/platform_device.h>
		#include <linux/regmap.h>
		#include <linux/slab.h>

		#define AXP20X_PEK_STARTUP_MASK (0xc0)
		#define AXP20X_PEK_SHUTDOWN_MASK (0x03)

		struct axp20x_pek {
		struct axp20x_dev *axp20x;
		struct input_dev *input;
		int irq_dbr;
		int irq_dbf;
		};

		struct axp20x_time {
		unsigned int time;
		unsigned int idx;
		};

		static const struct axp20x_time startup_time[] = {
		{ .time = 128, .idx = 0 },
		{ .time = 1000, .idx = 2 },
		{ .time = 3000, .idx = 1 },
		{ .time = 2000, .idx = 3 },
		};

		static const struct axp20x_time shutdown_time[] = {
		{ .time = 4000, .idx = 0 },
		{ .time = 6000, .idx = 1 },
		{ .time = 8000, .idx = 2 },
		{ .time = 10000, .idx = 3 },
		};

		struct axp20x_pek_ext_attr {
		const struct axp20x_time *p_time;
		unsigned int mask;
		};

		static struct axp20x_pek_ext_attr axp20x_pek_startup_ext_attr = {
		.p_time = startup_time,
		.mask = AXP20X_PEK_STARTUP_MASK,
		};

		static struct axp20x_pek_ext_attr axp20x_pek_shutdown_ext_attr = {
		.p_time = shutdown_time,
		.mask = AXP20X_PEK_SHUTDOWN_MASK,
		};

		static struct axp20x_pek_ext_attr get_axp_ext_attr(struct device_attribute attr)
		{
		return container_of(attr, struct dev_ext_attribute, attr)->var;
		}

		static ssize_t axp20x_show_ext_attr(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
		struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
		unsigned int val;
		int ret, i;

		ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val);
		if (ret != 0)
		return ret;

		val &= axp20x_ea->mask;
		val >>= ffs(axp20x_ea->mask) - 1;

		for (i = 0; i < 4; i++)
		if (val == axp20x_ea->p_time[i].idx)
		val = axp20x_ea->p_time[i].time;

		return sprintf(buf, "%u\n", val);
		}

		static ssize_t axp20x_store_ext_attr(struct device *dev,
		struct device_attribute *attr,
		const char *buf, size_t count)
		{
		struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
		struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
		char val_str[20];
		size_t len;
		int ret, i;
		unsigned int val, idx = 0;
		unsigned int best_err = UINT_MAX;

		val_str[sizeof(val_str) - 1] = '\0';
		strncpy(val_str, buf, sizeof(val_str) - 1);
		len = strlen(val_str);

		if (len && val_str[len - 1] == '\n')
		val_str[len - 1] = '\0';

		ret = kstrtouint(val_str, 10, &val);
		if (ret)
		return ret;

		for (i = 3; i >= 0; i--) {
		unsigned int err;

		err = abs(axp20x_ea->p_time[i].time - val);
		if (err < best_err) {
		best_err = err;
		idx = axp20x_ea->p_time[i].idx;
		}

		if (!err)
		break;
		}

		idx <<= ffs(axp20x_ea->mask) - 1;
		ret = regmap_update_bits(axp20x_pek->axp20x->regmap,
		AXP20X_PEK_KEY,
		axp20x_ea->mask, idx);
		if (ret != 0)
		return -EINVAL;
		return count;
		}

		static struct dev_ext_attribute axp20x_dev_attr_startup = {
		.attr = __ATTR(startup, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
		.var = &axp20x_pek_startup_ext_attr
		};

		static struct dev_ext_attribute axp20x_dev_attr_shutdown = {
		.attr = __ATTR(shutdown, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
		.var = &axp20x_pek_shutdown_ext_attr
		};

		static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
		{
		struct input_dev *idev = pwr;
		struct axp20x_pek *axp20x_pek = input_get_drvdata(idev);

		if (irq == axp20x_pek->irq_dbr)
		input_report_key(idev, KEY_POWER, true);
		else if (irq == axp20x_pek->irq_dbf)
		input_report_key(idev, KEY_POWER, false);

		input_sync(idev);

		return IRQ_HANDLED;
		}

		static int axp20x_pek_probe(struct platform_device *pdev)
		{
		struct axp20x_pek *axp20x_pek;
		struct axp20x_dev *axp20x;
		struct input_dev *idev;
		int error;

		axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek),
		GFP_KERNEL);
		if (!axp20x_pek)
		return -ENOMEM;

		axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent);
		axp20x = axp20x_pek->axp20x;

		axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR");
		if (axp20x_pek->irq_dbr < 0) {
		dev_err(&pdev->dev, "No IRQ for PEK_DBR, error=%d\n",
		axp20x_pek->irq_dbr);
		return axp20x_pek->irq_dbr;
		}
		axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc,
		axp20x_pek->irq_dbr);

		axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF");
		if (axp20x_pek->irq_dbf < 0) {
		dev_err(&pdev->dev, "No IRQ for PEK_DBF, error=%d\n",
		axp20x_pek->irq_dbf);
		return axp20x_pek->irq_dbf;
		}
		axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc,
		axp20x_pek->irq_dbf);

		axp20x_pek->input = devm_input_allocate_device(&pdev->dev);
		if (!axp20x_pek->input)
		return -ENOMEM;

		idev = axp20x_pek->input;

		idev->name = "axp20x-pek";
		idev->phys = "m1kbd/input2";
		idev->dev.parent = &pdev->dev;

		input_set_capability(idev, EV_KEY, KEY_POWER);

		input_set_drvdata(idev, axp20x_pek);

		error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr,
		axp20x_pek_irq, 0,
		"axp20x-pek-dbr", idev);
		if (error < 0) {
		dev_err(axp20x->dev, "Failed to request dbr IRQ#%d: %d\n",
		axp20x_pek->irq_dbr, error);

		return error;
		}

		error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf,
		axp20x_pek_irq, 0,
		"axp20x-pek-dbf", idev);
		if (error < 0) {
		dev_err(axp20x->dev, "Failed to request dbf IRQ#%d: %d\n",
		axp20x_pek->irq_dbf, error);
		return error;
		}

		error = device_create_file(&pdev->dev, &axp20x_dev_attr_startup.attr);
		if (error)
		return error;

		error = device_create_file(&pdev->dev, &axp20x_dev_attr_shutdown.attr);
		if (error)
		goto clear_startup_attr;

		error = input_register_device(idev);
		if (error) {
		dev_err(axp20x->dev, "Can't register input device: %d\n",
		error);
		goto clear_attr;
		}

		platform_set_drvdata(pdev, axp20x_pek);

		return 0;

		clear_attr:
		device_remove_file(&pdev->dev, &axp20x_dev_attr_shutdown.attr);

		clear_startup_attr:
		device_remove_file(&pdev->dev, &axp20x_dev_attr_startup.attr);

		return error;
		}

		static int axp20x_pek_remove(struct platform_device *pdev)
		{
		device_remove_file(&pdev->dev, &axp20x_dev_attr_shutdown.attr);
		device_remove_file(&pdev->dev, &axp20x_dev_attr_startup.attr);

		return 0;
		}

		static struct platform_driver axp20x_pek_driver = {
		.probe = axp20x_pek_probe,
		.remove = axp20x_pek_remove,
		.driver = {
		.name = "axp20x-pek",
		},
		};
		module_platform_driver(axp20x_pek_driver);

		MODULE_DESCRIPTION("axp20x Power Button");
		MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
		MODULE_LICENSE("GPL");