Input: add twl4030-pwrbutton driver (68d8bf04) · Commits · e / devices / android_kernel_teracube_emerald

drivers/input/misc/Kconfig

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		@@ -193,6 +193,16 @@ config INPUT_CM109
		To compile this driver as a module, choose M here: the module will be
		called cm109.

		config INPUT_TWL4030_PWRBUTTON
		tristate "TWL4030 Power button Driver"
		depends on TWL4030_CORE
		help
		Say Y here if you want to enable power key reporting via the
		TWL4030 family of chips.

		To compile this driver as a module, choose M here. The module will
		be called twl4030_pwrbutton.

		config INPUT_UINPUT
		tristate "User level driver support"
		help

drivers/input/misc/Makefile

+1 −0

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		@@ -21,6 +21,7 @@ obj-$(CONFIG_INPUT_RB532_BUTTON) += rb532_button.o
		obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o
		obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o
		obj-$(CONFIG_INPUT_SPARCSPKR) += sparcspkr.o
		obj-$(CONFIG_INPUT_TWL4030_PWRBUTTON) += twl4030-pwrbutton.o
		obj-$(CONFIG_INPUT_UINPUT) += uinput.o
		obj-$(CONFIG_INPUT_WISTRON_BTNS) += wistron_btns.o
		obj-$(CONFIG_INPUT_YEALINK) += yealink.o

drivers/input/misc/twl4030-pwrbutton.c

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Original line number	Diff line number	Diff line
		/**
		* twl4030-pwrbutton.c - TWL4030 Power Button Input Driver
		*
		* Copyright (C) 2008-2009 Nokia Corporation
		*
		* Written by Peter De Schrijver <peter.de-schrijver@nokia.com>
		* Several fixes by Felipe Balbi <felipe.balbi@nokia.com>
		*
		* 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.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		*/

		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <linux/errno.h>
		#include <linux/input.h>
		#include <linux/interrupt.h>
		#include <linux/platform_device.h>
		#include <linux/i2c/twl4030.h>

		#define PWR_PWRON_IRQ (1 << 0)

		#define STS_HW_CONDITIONS 0xf

		static irqreturn_t powerbutton_irq(int irq, void *_pwr)
		{
		struct input_dev *pwr = _pwr;
		int err;
		u8 value;

		#ifdef CONFIG_LOCKDEP
		/* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which
		* we don't want and can't tolerate since this is a threaded
		* IRQ and can sleep due to the i2c reads it has to issue.
		* Although it might be friendlier not to borrow this thread
		* context...
		*/
		local_irq_enable();
		#endif

		err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &value,
		STS_HW_CONDITIONS);
		if (!err) {
		input_report_key(pwr, KEY_POWER, value & PWR_PWRON_IRQ);
		input_sync(pwr);
		} else {
		dev_err(pwr->dev.parent, "twl4030: i2c error %d while reading"
		" TWL4030 PM_MASTER STS_HW_CONDITIONS register\n", err);
		}

		return IRQ_HANDLED;
		}

		static int __devinit twl4030_pwrbutton_probe(struct platform_device *pdev)
		{
		struct input_dev *pwr;
		int irq = platform_get_irq(pdev, 0);
		int err;

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

		pwr->evbit[0] = BIT_MASK(EV_KEY);
		pwr->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
		pwr->name = "twl4030_pwrbutton";
		pwr->phys = "twl4030_pwrbutton/input0";
		pwr->dev.parent = &pdev->dev;

		err = request_irq(irq, powerbutton_irq,
		IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING,
		"twl4030_pwrbutton", pwr);
		if (err < 0) {
		dev_dbg(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err);
		goto free_input_dev;
		}

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

		platform_set_drvdata(pdev, pwr);

		return 0;

		free_irq:
		free_irq(irq, NULL);
		free_input_dev:
		input_free_device(pwr);
		return err;
		}

		static int __devexit twl4030_pwrbutton_remove(struct platform_device *pdev)
		{
		struct input_dev *pwr = platform_get_drvdata(pdev);
		int irq = platform_get_irq(pdev, 0);

		free_irq(irq, pwr);
		input_unregister_device(pwr);

		return 0;
		}

		struct platform_driver twl4030_pwrbutton_driver = {
		.probe = twl4030_pwrbutton_probe,
		.remove = __devexit_p(twl4030_pwrbutton_remove),
		.driver = {
		.name = "twl4030_pwrbutton",
		.owner = THIS_MODULE,
		},
		};

		static int __init twl4030_pwrbutton_init(void)
		{
		return platform_driver_register(&twl4030_pwrbutton_driver);
		}
		module_init(twl4030_pwrbutton_init);

		static void __exit twl4030_pwrbutton_exit(void)
		{
		platform_driver_unregister(&twl4030_pwrbutton_driver);
		}
		module_exit(twl4030_pwrbutton_exit);

		MODULE_ALIAS("platform:twl4030_pwrbutton");
		MODULE_DESCRIPTION("Triton2 Power Button");
		MODULE_LICENSE("GPL");
		MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>");
		MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");