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    Subject[PATCH 1/2] input: misc: add twl4030-pwrbutton driver
    Date
    From: Felipe Balbi <felipe.balbi@nokia.com>

    This is part of the twl4030 multifunction device driver.

    With this driver we add support for reporting KEY_POWER
    events via the input layer.

    Cc: David Brownell <dbrownell@users.sourceforge.net>
    Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
    Cc: Samuel Ortiz <sameo@openedhand.com>
    Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
    ---
    I guess this part should go via input tree if Sam is ok with it.

    drivers/input/misc/Kconfig | 4 +
    drivers/input/misc/Makefile | 1 +
    drivers/input/misc/twl4030-pwrbutton.c | 147 ++++++++++++++++++++++++++++++++
    3 files changed, 152 insertions(+), 0 deletions(-)
    create mode 100644 drivers/input/misc/twl4030-pwrbutton.c

    diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
    index 67e5553..9667b50 100644
    --- a/drivers/input/misc/Kconfig
    +++ b/drivers/input/misc/Kconfig
    @@ -193,6 +193,10 @@ 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
    +
    config INPUT_UINPUT
    tristate "User level driver support"
    help
    diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
    index bb62e6e..2fabcdb 100644
    --- a/drivers/input/misc/Makefile
    +++ b/drivers/input/misc/Makefile
    @@ -19,6 +19,7 @@ obj-$(CONFIG_INPUT_YEALINK) += yealink.o
    obj-$(CONFIG_INPUT_CM109) += cm109.o
    obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
    obj-$(CONFIG_INPUT_UINPUT) += uinput.o
    +obj-$(CONFIG_INPUT_TWL4030_PWRBUTTON) += twl4030-pwrbutton.o
    obj-$(CONFIG_INPUT_APANEL) += apanel.o
    obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o
    obj-$(CONFIG_INPUT_PCF50633_PMU) += pcf50633-input.o
    diff --git a/drivers/input/misc/twl4030-pwrbutton.c b/drivers/input/misc/twl4030-pwrbutton.c
    new file mode 100644
    index 0000000..676d789
    --- /dev/null
    +++ b/drivers/input/misc/twl4030-pwrbutton.c
    @@ -0,0 +1,147 @@
    +/**
    + * drivers/i2c/chips/twl4030-pwrbutton.c
    + *
    + * Driver for sending triton2 power button event to input-layer
    + *
    + * Copyright (C) 2008-2009 Nokia Corporation
    + *
    + * Written by Peter De Schrijver <peter.de-schrijver@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 struct input_dev *powerbutton_dev;
    +static struct device *dbg_dev;
    +
    +static irqreturn_t powerbutton_irq(int irq, void *dev_id)
    +{
    + int err;
    + u8 value;
    +
    +#ifdef CONFIG_LOCKDEP
    + /* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which
    + * we don't want and can't tolerate. 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(powerbutton_dev, KEY_POWER,
    + value & PWR_PWRON_IRQ);
    + } else {
    + dev_err(dbg_dev, "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)
    +{
    + int err = 0;
    + int irq = platform_get_irq(pdev, 0);
    +
    + dbg_dev = &pdev->dev;
    +
    + /* PWRBTN == PWRON */
    + err = request_irq(irq, powerbutton_irq,
    + IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
    + "twl4030-pwrbutton", NULL);
    + if (err < 0) {
    + dev_dbg(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err);
    + goto out;
    + }
    +
    + powerbutton_dev = input_allocate_device();
    + if (!powerbutton_dev) {
    + dev_dbg(&pdev->dev, "Can't allocate power button\n");
    + err = -ENOMEM;
    + goto free_irq_and_out;
    + }
    +
    + powerbutton_dev->evbit[0] = BIT_MASK(EV_KEY);
    + powerbutton_dev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
    + powerbutton_dev->name = "triton2-pwrbutton";
    +
    + err = input_register_device(powerbutton_dev);
    + if (err) {
    + dev_dbg(&pdev->dev, "Can't register power button: %d\n", err);
    + goto free_input_dev;
    + }
    +
    + dev_info(&pdev->dev, "triton2 power button driver initialized\n");
    +
    + return 0;
    +
    +
    +free_input_dev:
    + input_free_device(powerbutton_dev);
    +free_irq_and_out:
    + free_irq(TWL4030_PWRIRQ_PWRBTN, NULL);
    +out:
    + return err;
    +}
    +
    +static int __devexit twl4030_pwrbutton_remove(struct platform_device *pdev)
    +{
    + int irq = platform_get_irq(pdev, 0);
    +
    + free_irq(irq, NULL);
    + input_unregister_device(powerbutton_dev);
    + input_free_device(powerbutton_dev);
    +
    + return 0;
    +}
    +
    +struct platform_driver twl4030_pwrbutton_driver = {
    + .probe = twl4030_pwrbutton_probe,
    + .remove = 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_DESCRIPTION("Triton2 Power Button");
    +MODULE_LICENSE("GPL");
    +MODULE_AUTHOR("Peter De Schrijver");
    +
    --
    1.6.2.rc0.61.g5cd12


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