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Commit 92d57a73 authored May 13, 2011 by Trilok Soni Committed by Samuel Ortiz May 26, 2011

input: Add support for Qualcomm PMIC8XXX power key



Add support for PMIC8XXX power key driven over dedicated
KYPD_PWR_N pin.

Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Trilok Soni <tsoni@codeaurora.org>
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

parent 39325b59

drivers/input/misc/Kconfig

+11 −0

Original line number	Diff line number	Diff line
		@@ -330,6 +330,17 @@ config INPUT_PWM_BEEPER
		To compile this driver as a module, choose M here: the module will be
		called pwm-beeper.

		config INPUT_PMIC8XXX_PWRKEY
		tristate "PMIC8XXX power key support"
		depends on MFD_PM8XXX
		help
		Say Y here if you want support for the PMIC8XXX power key.

		If unsure, say N.

		To compile this driver as a module, choose M here: the
		module will be called pmic8xxx-pwrkey.

		config INPUT_GPIO_ROTARY_ENCODER
		tristate "Rotary encoders connected to GPIO pins"
		depends on GPIOLIB && GENERIC_GPIO

drivers/input/misc/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -33,6 +33,7 @@ obj-$(CONFIG_INPUT_PCF8574) += pcf8574_keypad.o
		obj-$(CONFIG_INPUT_PCSPKR) += pcspkr.o
		obj-$(CONFIG_INPUT_POWERMATE) += powermate.o
		obj-$(CONFIG_INPUT_PWM_BEEPER) += pwm-beeper.o
		obj-$(CONFIG_INPUT_PMIC8XXX_PWRKEY) += pmic8xxx-pwrkey.o
		obj-$(CONFIG_INPUT_RB532_BUTTON) += rb532_button.o
		obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o
		obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o

drivers/input/misc/pmic8xxx-pwrkey.c

0 → 100644

+231 −0

Original line number	Diff line number	Diff line
		/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 and
		* only version 2 as published by the Free Software Foundation.
		*
		* 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/module.h>
		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <linux/errno.h>
		#include <linux/slab.h>
		#include <linux/input.h>
		#include <linux/interrupt.h>
		#include <linux/platform_device.h>
		#include <linux/log2.h>

		#include <linux/mfd/pm8xxx/core.h>
		#include <linux/input/pmic8xxx-pwrkey.h>

		#define PON_CNTL_1 0x1C
		#define PON_CNTL_PULL_UP BIT(7)
		#define PON_CNTL_TRIG_DELAY_MASK (0x7)

		/**
		* struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
		* @key_press_irq: key press irq number
		*/
		struct pmic8xxx_pwrkey {
		struct input_dev *pwr;
		int key_press_irq;
		};

		static irqreturn_t pwrkey_press_irq(int irq, void *_pwrkey)
		{
		struct pmic8xxx_pwrkey *pwrkey = _pwrkey;

		input_report_key(pwrkey->pwr, KEY_POWER, 1);
		input_sync(pwrkey->pwr);

		return IRQ_HANDLED;
		}

		static irqreturn_t pwrkey_release_irq(int irq, void *_pwrkey)
		{
		struct pmic8xxx_pwrkey *pwrkey = _pwrkey;

		input_report_key(pwrkey->pwr, KEY_POWER, 0);
		input_sync(pwrkey->pwr);

		return IRQ_HANDLED;
		}

		#ifdef CONFIG_PM_SLEEP
		static int pmic8xxx_pwrkey_suspend(struct device *dev)
		{
		struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);

		if (device_may_wakeup(dev))
		enable_irq_wake(pwrkey->key_press_irq);

		return 0;
		}

		static int pmic8xxx_pwrkey_resume(struct device *dev)
		{
		struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);

		if (device_may_wakeup(dev))
		disable_irq_wake(pwrkey->key_press_irq);

		return 0;
		}
		#endif

		static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
		pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);

		static int __devinit pmic8xxx_pwrkey_probe(struct platform_device *pdev)
		{
		struct input_dev *pwr;
		int key_release_irq = platform_get_irq(pdev, 0);
		int key_press_irq = platform_get_irq(pdev, 1);
		int err;
		unsigned int delay;
		u8 pon_cntl;
		struct pmic8xxx_pwrkey *pwrkey;
		const struct pm8xxx_pwrkey_platform_data *pdata = mfd_get_data(pdev);

		if (!pdata) {
		dev_err(&pdev->dev, "power key platform data not supplied\n");
		return -EINVAL;
		}

		if (pdata->kpd_trigger_delay_us > 62500) {
		dev_err(&pdev->dev, "invalid power key trigger delay\n");
		return -EINVAL;
		}

		pwrkey = kzalloc(sizeof(*pwrkey), GFP_KERNEL);
		if (!pwrkey)
		return -ENOMEM;

		pwr = input_allocate_device();
		if (!pwr) {
		dev_dbg(&pdev->dev, "Can't allocate power button\n");
		err = -ENOMEM;
		goto free_pwrkey;
		}

		input_set_capability(pwr, EV_KEY, KEY_POWER);

		pwr->name = "pmic8xxx_pwrkey";
		pwr->phys = "pmic8xxx_pwrkey/input0";
		pwr->dev.parent = &pdev->dev;

		delay = (pdata->kpd_trigger_delay_us << 10) / USEC_PER_SEC;
		delay = 1 + ilog2(delay);

		err = pm8xxx_readb(pdev->dev.parent, PON_CNTL_1, &pon_cntl);
		if (err < 0) {
		dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
		goto free_input_dev;
		}

		pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
		pon_cntl \|= (delay & PON_CNTL_TRIG_DELAY_MASK);
		if (pdata->pull_up)
		pon_cntl \|= PON_CNTL_PULL_UP;
		else
		pon_cntl &= ~PON_CNTL_PULL_UP;

		err = pm8xxx_writeb(pdev->dev.parent, PON_CNTL_1, pon_cntl);
		if (err < 0) {
		dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
		goto free_input_dev;
		}

		err = input_register_device(pwr);
		if (err) {
		dev_dbg(&pdev->dev, "Can't register power key: %d\n", err);
		goto free_input_dev;
		}

		pwrkey->key_press_irq = key_press_irq;
		pwrkey->pwr = pwr;

		platform_set_drvdata(pdev, pwrkey);

		err = request_irq(key_press_irq, pwrkey_press_irq,
		IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_press", pwrkey);
		if (err < 0) {
		dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
		key_press_irq, err);
		goto unreg_input_dev;
		}

		err = request_irq(key_release_irq, pwrkey_release_irq,
		IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_release", pwrkey);
		if (err < 0) {
		dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
		key_release_irq, err);

		goto free_press_irq;
		}

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

		return 0;

		free_press_irq:
		free_irq(key_press_irq, NULL);
		unreg_input_dev:
		platform_set_drvdata(pdev, NULL);
		input_unregister_device(pwr);
		pwr = NULL;
		free_input_dev:
		input_free_device(pwr);
		free_pwrkey:
		kfree(pwrkey);
		return err;
		}

		static int __devexit pmic8xxx_pwrkey_remove(struct platform_device *pdev)
		{
		struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev);
		int key_release_irq = platform_get_irq(pdev, 0);
		int key_press_irq = platform_get_irq(pdev, 1);

		device_init_wakeup(&pdev->dev, 0);

		free_irq(key_press_irq, pwrkey);
		free_irq(key_release_irq, pwrkey);
		input_unregister_device(pwrkey->pwr);
		platform_set_drvdata(pdev, NULL);
		kfree(pwrkey);

		return 0;
		}

		static struct platform_driver pmic8xxx_pwrkey_driver = {
		.probe = pmic8xxx_pwrkey_probe,
		.remove = __devexit_p(pmic8xxx_pwrkey_remove),
		.driver = {
		.name = PM8XXX_PWRKEY_DEV_NAME,
		.owner = THIS_MODULE,
		.pm = &pm8xxx_pwr_key_pm_ops,
		},
		};

		static int __init pmic8xxx_pwrkey_init(void)
		{
		return platform_driver_register(&pmic8xxx_pwrkey_driver);
		}
		module_init(pmic8xxx_pwrkey_init);

		static void __exit pmic8xxx_pwrkey_exit(void)
		{
		platform_driver_unregister(&pmic8xxx_pwrkey_driver);
		}
		module_exit(pmic8xxx_pwrkey_exit);

		MODULE_ALIAS("platform:pmic8xxx_pwrkey");
		MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
		MODULE_LICENSE("GPL v2");
		MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");

include/linux/input/pmic8xxx-pwrkey.h

0 → 100644

+31 −0

Original line number	Diff line number	Diff line
		/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 and
		* only version 2 as published by the Free Software Foundation.
		*
		* 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.
		*/

		#ifndef __PMIC8XXX_PWRKEY_H__
		#define __PMIC8XXX_PWRKEY_H__

		#define PM8XXX_PWRKEY_DEV_NAME "pm8xxx-pwrkey"

		/**
		* struct pm8xxx_pwrkey_platform_data - platform data for pwrkey driver
		* @pull up: power on register control for pull up/down configuration
		* @kpd_trigger_delay_us: time delay for power key state change interrupt
		* trigger.
		* @wakeup: configure power key as wakeup source
		*/
		struct pm8xxx_pwrkey_platform_data {
		bool pull_up;
		u32 kpd_trigger_delay_us;
		u32 wakeup;
		};

		#endif /* __PMIC8XXX_PWRKEY_H__ */