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    Subject[PATCH 4/4] input: misc: introduce retu-pwrbutton
    Date
    Add Retu power button driver.

    Cc: linux-input@vger.kernel.org
    Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
    ---
    drivers/input/misc/Kconfig | 10 +++
    drivers/input/misc/Makefile | 1 +
    drivers/input/misc/retu-pwrbutton.c | 127 +++++++++++++++++++++++++++++++++++
    3 files changed, 138 insertions(+), 0 deletions(-)
    create mode 100644 drivers/input/misc/retu-pwrbutton.c

    diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
    index 7c0f1ec..e5be189 100644
    --- a/drivers/input/misc/Kconfig
    +++ b/drivers/input/misc/Kconfig
    @@ -367,6 +367,16 @@ config INPUT_CM109
    To compile this driver as a module, choose M here: the module will be
    called cm109.

    +config INPUT_RETU_PWRBUTTON
    + tristate "Retu Power button Driver"
    + depends on MFD_RETU
    + help
    + Say Y here if you want to enable power key reporting via the
    + Retu chips found in Nokia Internet Tablets (770, N800, N810).
    +
    + To compile this driver as a module, choose M here. The module will
    + be called retu-pwrbutton.
    +
    config INPUT_TWL4030_PWRBUTTON
    tristate "TWL4030 Power button Driver"
    depends on TWL4030_CORE
    diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
    index 83fe6f5..4fbee0d 100644
    --- a/drivers/input/misc/Makefile
    +++ b/drivers/input/misc/Makefile
    @@ -45,6 +45,7 @@ obj-$(CONFIG_INPUT_PMIC8XXX_PWRKEY) += pmic8xxx-pwrkey.o
    obj-$(CONFIG_INPUT_POWERMATE) += powermate.o
    obj-$(CONFIG_INPUT_PWM_BEEPER) += pwm-beeper.o
    obj-$(CONFIG_INPUT_RB532_BUTTON) += rb532_button.o
    +obj-$(CONFIG_INPUT_RETU_PWRBUTTON) += retu-pwrbutton.o
    obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o
    obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o
    obj-$(CONFIG_INPUT_SPARCSPKR) += sparcspkr.o
    diff --git a/drivers/input/misc/retu-pwrbutton.c b/drivers/input/misc/retu-pwrbutton.c
    new file mode 100644
    index 0000000..f802d4d
    --- /dev/null
    +++ b/drivers/input/misc/retu-pwrbutton.c
    @@ -0,0 +1,127 @@
    +/*
    + * Retu power button driver.
    + *
    + * Copyright (C) 2004-2010 Nokia Corporation
    + *
    + * Original code written by Ari Saastamoinen, Juha Yrjölä and Felipe Balbi.
    + * Converted to use to use Retu MFD driver by Aaro Koskinen.
    + *
    + * 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/irq.h>
    +#include <linux/init.h>
    +#include <linux/slab.h>
    +#include <linux/errno.h>
    +#include <linux/input.h>
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/mfd/retu.h>
    +#include <linux/interrupt.h>
    +#include <linux/platform_device.h>
    +
    +#define RETU_STATUS_PWRONX (1 << 5)
    +
    +struct retu_pwrbutton {
    + struct input_dev *idev;
    + struct retu_dev *rdev;
    + struct device *dev;
    + bool pressed;
    + int irq;
    +};
    +
    +static irqreturn_t retu_pwrbutton_irq(int irq, void *_pwr)
    +{
    + struct retu_pwrbutton *pwr = _pwr;
    + bool state;
    +
    + state = !(retu_read(pwr->rdev, RETU_REG_STATUS) & RETU_STATUS_PWRONX);
    +
    + if (pwr->pressed != state) {
    + input_report_key(pwr->idev, KEY_POWER, state);
    + input_sync(pwr->idev);
    + pwr->pressed = state;
    + }
    +
    + return IRQ_HANDLED;
    +}
    +
    +static int __devinit retu_pwrbutton_probe(struct platform_device *pdev)
    +{
    + struct retu_dev *rdev = dev_get_drvdata(pdev->dev.parent);
    + struct retu_pwrbutton *pwr;
    + int ret;
    +
    + pwr = kzalloc(sizeof(*pwr), GFP_KERNEL);
    + if (!pwr)
    + return -ENOMEM;
    +
    + pwr->rdev = rdev;
    + pwr->dev = &pdev->dev;
    + pwr->irq = platform_get_irq(pdev, 0);
    + platform_set_drvdata(pdev, pwr);
    +
    + ret = request_threaded_irq(pwr->irq, NULL, retu_pwrbutton_irq, 0,
    + "retu-pwrbutton", pwr);
    + if (ret < 0)
    + goto error_irq;
    +
    + pwr->idev = input_allocate_device();
    + if (!pwr->idev) {
    + ret = -ENOMEM;
    + goto error_input;
    + }
    +
    + pwr->idev->evbit[0] = BIT_MASK(EV_KEY);
    + pwr->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
    + pwr->idev->name = "retu-pwrbutton";
    +
    + ret = input_register_device(pwr->idev);
    + if (ret < 0)
    + goto error_reg;
    +
    + return 0;
    +
    +error_reg:
    + input_free_device(pwr->idev);
    +error_input:
    + free_irq(pwr->irq, pwr);
    +error_irq:
    + kfree(pwr);
    + return ret;
    +}
    +
    +static int __devexit retu_pwrbutton_remove(struct platform_device *pdev)
    +{
    + struct retu_pwrbutton *pwr = platform_get_drvdata(pdev);
    +
    + free_irq(pwr->irq, pwr);
    + input_unregister_device(pwr->idev);
    + input_free_device(pwr->idev);
    + kfree(pwr);
    +
    + return 0;
    +}
    +
    +static struct platform_driver retu_pwrbutton_driver = {
    + .probe = retu_pwrbutton_probe,
    + .remove = __devexit_p(retu_pwrbutton_remove),
    + .driver = {
    + .name = "retu-pwrbutton",
    + },
    +};
    +module_platform_driver(retu_pwrbutton_driver);
    +
    +MODULE_ALIAS("platform:retu-pwrbutton");
    +MODULE_DESCRIPTION("Retu Power Button");
    +MODULE_AUTHOR("Ari Saastamoinen");
    +MODULE_AUTHOR("Felipe Balbi");
    +MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
    +MODULE_LICENSE("GPL");
    --
    1.7.2.5
    --
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