[1/2] mc13783: add power button support

This adds support for the power-on buttons of MC13783 PMIC.
This is done using a misc input device.

Signed-off-by: Philippe Rétornaz <philippe.retornaz@epfl.ch>
---
 drivers/input/misc/Kconfig             |   11 ++
 drivers/input/misc/Makefile            |    1 +
 drivers/input/misc/mc13783-pwrbutton.c |  288 ++++++++++++++++++++++++++++++++
 drivers/mfd/mc13xxx-core.c             |    4 +
 include/linux/mfd/mc13783.h            |    1 +
 include/linux/mfd/mc13xxx.h            |   18 ++
 6 files changed, 323 insertions(+), 0 deletions(-)
 create mode 100644 drivers/input/misc/mc13783-pwrbutton.c

Hello Philippe,

On Fri, Jul 08, 2011 at 04:23:56PM +0200, Philippe Rétornaz wrote:
> This adds support for the power-on buttons of MC13783 PMIC.
> This is done using a misc input device.
> 
> Signed-off-by: Philippe Rétornaz <philippe.retornaz@epfl.ch>
> ---
>  drivers/input/misc/Kconfig             |   11 ++
>  drivers/input/misc/Makefile            |    1 +
>  drivers/input/misc/mc13783-pwrbutton.c |  288 ++++++++++++++++++++++++++++++++
>  drivers/mfd/mc13xxx-core.c             |    4 +
>  include/linux/mfd/mc13783.h            |    1 +
>  include/linux/mfd/mc13xxx.h            |   18 ++
>  6 files changed, 323 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/input/misc/mc13783-pwrbutton.c
> 
> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
> index 45dc6aa..87d595c 100644
> --- a/drivers/input/misc/Kconfig
> +++ b/drivers/input/misc/Kconfig
> @@ -100,6 +100,17 @@ config INPUT_MAX8925_ONKEY
>  	  To compile this driver as a module, choose M here: the module
>  	  will be called max8925_onkey.
>  
> +config INPUT_MC13783_ON
> +	tristate "MC13783 ON buttons"
> +	depends on MFD_MC13783
> +	help
> +	  Support the ON buttons of MC13783 PMIC as an input device
> +	  reporting power button status.
> +
> +	  To compile this driver as a module, choose M here: the module
> +	  will be called mc13783-pwrbutton.
Why not use INPUT_MC13783_PWRBUTTON to match the source file (and so
module) name.
> +
> +
one empty line should be enough
>  config INPUT_APANEL
>  	tristate "Fujitsu Lifebook Application Panel buttons"
>  	depends on X86 && I2C && LEDS_CLASS
> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
> index 38efb2c..fdc6ab9 100644
> --- a/drivers/input/misc/Makefile
> +++ b/drivers/input/misc/Makefile
> @@ -27,6 +27,7 @@ obj-$(CONFIG_INPUT_IXP4XX_BEEPER)	+= ixp4xx-beeper.o
>  obj-$(CONFIG_INPUT_KEYSPAN_REMOTE)	+= keyspan_remote.o
>  obj-$(CONFIG_INPUT_M68K_BEEP)		+= m68kspkr.o
>  obj-$(CONFIG_INPUT_MAX8925_ONKEY)	+= max8925_onkey.o
> +obj-$(CONFIG_INPUT_MC13783_ON)		+= mc13783-pwrbutton.o
>  obj-$(CONFIG_INPUT_PCAP)		+= pcap_keys.o
>  obj-$(CONFIG_INPUT_PCF50633_PMU)	+= pcf50633-input.o
>  obj-$(CONFIG_INPUT_PCF8574)		+= pcf8574_keypad.o
> diff --git a/drivers/input/misc/mc13783-pwrbutton.c b/drivers/input/misc/mc13783-pwrbutton.c
> new file mode 100644
> index 0000000..6aee01c
> --- /dev/null
> +++ b/drivers/input/misc/mc13783-pwrbutton.c
> @@ -0,0 +1,288 @@
> +/**
> + * mc13783-pwrbutton.c - MC13783 Power Button Input Driver
> + *
> + * Copyright (C) 2011 Philippe Rétornaz
> + *
> + * Based on twl4030-pwrbutton driver by:
> + *     Peter De Schrijver <peter.de-schrijver@nokia.com>
> + *     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 implies GPL v2 only? So you either need to clearify here or you
need to adapt the MODULE_LICENSE line below to read

	MODULE_LICENSE("GPL v2");

> + *
> + * 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
This is not the recent address of the FSF.

> + */
> +
> +#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/mfd/mc13783.h>
> +#include <linux/sched.h>
> +#include <linux/slab.h>
> +
> +struct mc13783_pwrb {
> +	struct input_dev *pwr;
> +	struct mc13xxx *mc13783;
> +#define MC13783_PWRB_B1_POL_INVERT	(1 << 0)
> +#define MC13783_PWRB_B2_POL_INVERT	(1 << 1)
> +#define MC13783_PWRB_B3_POL_INVERT	(1 << 2)
> +	int flags;
> +	unsigned short keymap[3];
> +};
> +
> +#define MC13783_REG_INTERRUPT_SENSE_1		5
> +#define MC13783_IRQSENSE1_ONOFD1S		(1 << 3)
> +#define MC13783_IRQSENSE1_ONOFD2S		(1 << 4)
> +#define MC13783_IRQSENSE1_ONOFD3S		(1 << 5)
> +
> +#define MC13783_REG_POWER_CONTROL_2		15
> +#define MC13783_POWER_CONTROL_2_ON1BDBNC	4
> +#define MC13783_POWER_CONTROL_2_ON2BDBNC	6
> +#define MC13783_POWER_CONTROL_2_ON3BDBNC	8
> +#define MC13783_POWER_CONTROL_2_ON1BRSTEN	(1 << 1)
> +#define MC13783_POWER_CONTROL_2_ON2BRSTEN	(1 << 2)
> +#define MC13783_POWER_CONTROL_2_ON3BRSTEN	(1 << 3)
> +
> +static irqreturn_t button_irq(int irq, void *_priv)
> +{
> +	struct mc13783_pwrb *priv = _priv;
> +	int val;
> +	mc13xxx_irq_ack(priv->mc13783, irq);
> +	mc13xxx_reg_read(priv->mc13783, MC13783_REG_INTERRUPT_SENSE_1, &val);
> +
> +	switch (irq) {
> +	case MC13783_IRQ_ONOFD1:
> +		val = val & MC13783_IRQSENSE1_ONOFD1S ? 1 : 0;
> +		if (priv->flags & MC13783_PWRB_B1_POL_INVERT)
> +			val ^= 1;
> +		input_report_key(priv->pwr, priv->keymap[0], val);
> +		break;
> +
> +	case MC13783_IRQ_ONOFD2:
> +		val = val & MC13783_IRQSENSE1_ONOFD2S ? 1 : 0;
> +		if (priv->flags & MC13783_PWRB_B2_POL_INVERT)
> +			val ^= 1;
> +		input_report_key(priv->pwr, priv->keymap[1], val);
> +		break;
> +
> +	case MC13783_IRQ_ONOFD3:
> +		val = val & MC13783_IRQSENSE1_ONOFD3S ? 1 : 0;
> +		if (priv->flags & MC13783_PWRB_B3_POL_INVERT)
> +			val ^= 1;
> +		input_report_key(priv->pwr, priv->keymap[2], val);
> +		break;
> +	}
> +
> +	input_sync(priv->pwr);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int __devinit mc13783_pwrbutton_probe(struct platform_device *pdev)
> +{
> +	struct mc13xxx_buttons_platform_data *pdata;
> +	struct mc13xxx *mc13783 = dev_get_drvdata(pdev->dev.parent);
> +	struct input_dev *pwr;
> +	struct mc13783_pwrb *priv;
> +	int err = 0;
> +	int reg = 0;
> +
> +	pdata = dev_get_platdata(&pdev->dev);
> +	if (pdata == NULL) {
> +		dev_err(&pdev->dev, "missing platform data\n");
> +		return -ENODEV;
> +	}
> +
> +	pwr = input_allocate_device();
> +	if (!pwr) {
> +		dev_dbg(&pdev->dev, "Can't allocate power button\n");
> +		return -ENOMEM;
> +	}
> +
> +	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> +
> +	if (!priv) {
> +		err = -ENOMEM;
> +		dev_dbg(&pdev->dev, "Can't allocate power button\n");
> +		goto free_input_dev;
> +	}
> +
> +	pwr->evbit[0] = BIT_MASK(EV_KEY);
> +
> +	reg |= (pdata->b1on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON1BDBNC;
> +	reg |= (pdata->b2on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON2BDBNC;
> +	reg |= (pdata->b3on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON3BDBNC;
> +
> +	priv->pwr = pwr;
> +	priv->mc13783 = mc13783;
> +
> +	mc13xxx_lock(mc13783);
> +
> +	if (pdata->b1on_flags & MC13783_BUTTON_ENABLE) {
> +		priv->keymap[0] = pdata->b1on_key;
> +		if (pdata->b1on_key != KEY_RESERVED)
> +			__set_bit(pdata->b1on_key, pwr->keybit);
> +
> +		if (pdata->b1on_flags & MC13783_BUTTON_POL_INVERT)
> +			priv->flags |= MC13783_PWRB_B1_POL_INVERT;
> +
> +		if (pdata->b1on_flags & MC13783_BUTTON_RESET_EN)
> +			reg |= MC13783_POWER_CONTROL_2_ON1BRSTEN;
> +
> +		err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD1,
> +					  button_irq, "b1on", priv);
> +
> +		if (err) {
> +			mc13xxx_unlock(mc13783);
> +
> +			dev_dbg(&pdev->dev, "Can't request irq\n");
> +			goto free_priv;
> +		}
> +	}
> +
> +	if (pdata->b2on_flags & MC13783_BUTTON_ENABLE) {
> +		priv->keymap[0] = pdata->b2on_key;
> +		if (pdata->b2on_key != KEY_RESERVED)
> +			__set_bit(pdata->b2on_key, pwr->keybit);
> +
> +		if (pdata->b2on_flags & MC13783_BUTTON_POL_INVERT)
> +			priv->flags |= MC13783_PWRB_B2_POL_INVERT;
> +
> +		if (pdata->b2on_flags & MC13783_BUTTON_RESET_EN)
> +			reg |= MC13783_POWER_CONTROL_2_ON2BRSTEN;
> +
> +		err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD2,
> +					  button_irq, "b2on", priv);
> +
> +		if (err) {
> +			dev_dbg(&pdev->dev, "Can't request irq\n");
> +			goto free_irq_b1;
> +		}
> +	}
> +
> +	if (pdata->b3on_flags & MC13783_BUTTON_ENABLE) {
> +		priv->keymap[0] = pdata->b3on_key;
> +		if (pdata->b3on_key != KEY_RESERVED)
> +			__set_bit(pdata->b3on_key, pwr->keybit);
> +
> +		if (pdata->b3on_flags & MC13783_BUTTON_POL_INVERT)
> +			priv->flags |= MC13783_PWRB_B3_POL_INVERT;
> +
> +		if (pdata->b3on_flags & MC13783_BUTTON_RESET_EN)
> +			reg |= MC13783_POWER_CONTROL_2_ON3BRSTEN;
> +
> +		err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD3,
> +					  button_irq, "b3on", priv);
> +
> +		if (err) {
> +			dev_dbg(&pdev->dev, "Can't request irq: %d\n", err);
> +			goto free_irq_b2;
> +		}
> +	}
> +
> +	mc13xxx_reg_rmw(mc13783, MC13783_REG_POWER_CONTROL_2, 0x3FE, reg);
> +
> +	mc13xxx_unlock(mc13783);
> +
> +	pwr->name = "mc13783_pwrbutton";
> +	pwr->phys = "mc13783_pwrbutton/input0";
> +	pwr->dev.parent = &pdev->dev;
> +
> +	pwr->keycode = priv->keymap;
> +	pwr->keycodemax = ARRAY_SIZE(priv->keymap);
> +	pwr->keycodesize = sizeof(priv->keymap[0]);
> +
> +	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, priv);
> +
> +	return 0;
> +
> +free_irq:
> +	mc13xxx_lock(mc13783);
> +
> +	if (pdata->b3on_flags & MC13783_BUTTON_ENABLE)
> +		mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD3, priv);
> +free_irq_b2:
> +	if (pdata->b2on_flags & MC13783_BUTTON_ENABLE)
> +		mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD2, priv);
> +
> +free_irq_b1:
> +	if (pdata->b1on_flags & MC13783_BUTTON_ENABLE)
> +		mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD1, priv);
> +
> +	mc13xxx_unlock(mc13783);
> +
> +free_priv:
> +	kfree(priv);
> +
> +free_input_dev:
> +	input_free_device(pwr);
> +
> +	return err;
> +}
> +
> +static int __devexit mc13783_pwrbutton_remove(struct platform_device *pdev)
> +{
> +	struct mc13783_pwrb *priv = platform_get_drvdata(pdev);
> +	struct mc13xxx_buttons_platform_data *pdata;
> +	pdata = dev_get_platdata(&pdev->dev);
> +
> +	mc13xxx_lock(priv->mc13783);
> +
> +	if (pdata->b3on_flags & MC13783_BUTTON_ENABLE)
> +		mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD3, priv);
> +	if (pdata->b2on_flags & MC13783_BUTTON_ENABLE)
> +		mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD2, priv);
> +	if (pdata->b1on_flags & MC13783_BUTTON_ENABLE)
> +		mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD1, priv);
> +
> +	mc13xxx_unlock(priv->mc13783);
> +
> +	input_unregister_device(priv->pwr);
> +	kfree(priv);
> +
> +	return 0;
> +}
> +
> +struct platform_driver mc13783_pwrbutton_driver = {
> +	.probe		= mc13783_pwrbutton_probe,
> +	.remove		= __devexit_p(mc13783_pwrbutton_remove),
> +	.driver		= {
> +		.name	= "mc13783-pwrbutton",
> +		.owner	= THIS_MODULE,
> +	},
> +};
> +
> +static int __init mc13783_pwrbutton_init(void)
> +{
> +	return platform_driver_register(&mc13783_pwrbutton_driver);
> +}
> +module_init(mc13783_pwrbutton_init);
> +
> +static void __exit mc13783_pwrbutton_exit(void)
> +{
> +	platform_driver_unregister(&mc13783_pwrbutton_driver);
> +}
> +module_exit(mc13783_pwrbutton_exit);
> +
> +MODULE_ALIAS("platform:mc13783-pwrbutton");
> +MODULE_DESCRIPTION("MC13783 Power Button");
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Philippe Retornaz");
> diff --git a/drivers/mfd/mc13xxx-core.c b/drivers/mfd/mc13xxx-core.c
> index 7e4d44b..44edf78 100644
> --- a/drivers/mfd/mc13xxx-core.c
> +++ b/drivers/mfd/mc13xxx-core.c
> @@ -778,6 +778,10 @@ err_revision:
>  		mc13xxx_add_subdevice_pdata(mc13xxx, "%s-led",
>  				pdata->leds, sizeof(*pdata->leds));
>  
> +	if (pdata->flags & MC13XXX_USE_BUTTON)
Why not use

	if (pdata->buttons)

to detect if the pwrbutton device should be registered?

> +		mc13xxx_add_subdevice_pdata(mc13xxx, "%s-pwrbutton",
> +				pdata->buttons, sizeof(*pdata->buttons));
> +
>  	return 0;
>  }
>  
> diff --git a/include/linux/mfd/mc13783.h b/include/linux/mfd/mc13783.h
> index 7d0f3d6..bd4fbac 100644
> --- a/include/linux/mfd/mc13783.h
> +++ b/include/linux/mfd/mc13783.h
> @@ -106,6 +106,7 @@ static inline int mc13783_irq_ack(struct mc13783 *mc13783, int irq)
>  #define mc13783_regulator_platform_data mc13xxx_regulator_platform_data
>  #define mc13783_led_platform_data mc13xxx_led_platform_data
>  #define mc13783_leds_platform_data mc13xxx_leds_platform_data
> +#define mc13783_buttons_platform_data mc13xxx_buttons_platform_data
>  
>  #define mc13783_platform_data mc13xxx_platform_data
>  #define MC13783_USE_TOUCHSCREEN	MC13XXX_USE_TOUCHSCREEN
> diff --git a/include/linux/mfd/mc13xxx.h b/include/linux/mfd/mc13xxx.h
> index c064bea..22d8930 100644
> --- a/include/linux/mfd/mc13xxx.h
> +++ b/include/linux/mfd/mc13xxx.h
> @@ -137,6 +137,22 @@ struct mc13xxx_leds_platform_data {
>  	char tc3_period;
>  };
>  
> +struct mc13xxx_buttons_platform_data {
> +#define MC13783_BUTTON_DBNC_0MS		0
> +#define MC13783_BUTTON_DBNC_30MS	1
> +#define MC13783_BUTTON_DBNC_150MS	2
> +#define MC13783_BUTTON_DBNC_750MS	3
> +#define MC13783_BUTTON_ENABLE		(1 << 2)
> +#define MC13783_BUTTON_POL_INVERT	(1 << 3)
> +#define MC13783_BUTTON_RESET_EN		(1 << 4)
> +	int b1on_flags;
> +	unsigned short b1on_key;
> +	int b2on_flags;
> +	unsigned short b2on_key;
> +	int b3on_flags;
> +	unsigned short b3on_key;
> +};
> +
>  struct mc13xxx_platform_data {
>  #define MC13XXX_USE_TOUCHSCREEN (1 << 0)
>  #define MC13XXX_USE_CODEC	(1 << 1)
> @@ -144,10 +160,12 @@ struct mc13xxx_platform_data {
>  #define MC13XXX_USE_RTC		(1 << 3)
>  #define MC13XXX_USE_REGULATOR	(1 << 4)
>  #define MC13XXX_USE_LED		(1 << 5)
> +#define MC13XXX_USE_BUTTON	(1 << 6)
>  	unsigned int flags;
>  
>  	struct mc13xxx_regulator_platform_data regulators;
>  	struct mc13xxx_leds_platform_data *leds;
> +	struct mc13xxx_buttons_platform_data *buttons;
>  };
>  
>  #endif /* ifndef __LINUX_MFD_MC13XXX_H */

Best regards
Uwe

Hi

> > +config INPUT_MC13783_ON
> > +	tristate "MC13783 ON buttons"
> > +	depends on MFD_MC13783
> > +	help
> > +	  Support the ON buttons of MC13783 PMIC as an input device
> > +	  reporting power button status.
> > +
> > +	  To compile this driver as a module, choose M here: the module
> > +	  will be called mc13783-pwrbutton.
> 
> Why not use INPUT_MC13783_PWRBUTTON to match the source file (and so
> module) name.

Ok.

> 
> > +
> > +
> 
> one empty line should be enough

Ok.

> > diff --git a/drivers/input/misc/mc13783-pwrbutton.c
> > b/drivers/input/misc/mc13783-pwrbutton.c new file mode 100644
> > index 0000000..6aee01c
> > --- /dev/null
> > +++ b/drivers/input/misc/mc13783-pwrbutton.c
> > @@ -0,0 +1,288 @@
> > +/**
> > + * mc13783-pwrbutton.c - MC13783 Power Button Input Driver
> > + *
> > + * Copyright (C) 2011 Philippe Rétornaz
> > + *
> > + * Based on twl4030-pwrbutton driver by:
> > + *     Peter De Schrijver <peter.de-schrijver@nokia.com>
> > + *     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 implies GPL v2 only? So you either need to clearify here or you
> need to adapt the MODULE_LICENSE line below to read
> 
> 	MODULE_LICENSE("GPL v2");

Well, I took exactly the same license than the twl4030-pwrbutton. 
This driver is: MODULE_LICENSE("GPL"), why should I change it ?

> > + *
> > + * 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
> 
> This is not the recent address of the FSF.

Ok, will update to 51 Franklin Street, Suite 500, Boston, MA 02110-1335


> > --- a/drivers/mfd/mc13xxx-core.c
> > +++ b/drivers/mfd/mc13xxx-core.c
> > 
> > @@ -778,6 +778,10 @@ err_revision:
> >  		mc13xxx_add_subdevice_pdata(mc13xxx, "%s-led",
> >  		
> >  				pdata->leds, sizeof(*pdata->leds));
> > 
> > +	if (pdata->flags & MC13XXX_USE_BUTTON)
> 
> Why not use
> 
> 	if (pdata->buttons)
> 
> to detect if the pwrbutton device should be registered?

To keep consistancy as the others sub-device are registered the same way 
(regulator, led). I can do it as you propose for the button but IMHO it's a 
bit strange to have a MC13XXX_USE_* for all the subdevice except the buttons. 
So should I change ?

Thanks for the review ! 

Philippe

Hello Philippe,

On Fri, Jul 08, 2011 at 04:45:00PM +0200, Philippe Rétornaz wrote:
> > > +config INPUT_MC13783_ON
> > > +	tristate "MC13783 ON buttons"
> > > +	depends on MFD_MC13783
> > > +	help
> > > +	  Support the ON buttons of MC13783 PMIC as an input device
> > > +	  reporting power button status.
> > > +
> > > +	  To compile this driver as a module, choose M here: the module
> > > +	  will be called mc13783-pwrbutton.
> > 
> > Why not use INPUT_MC13783_PWRBUTTON to match the source file (and so
> > module) name.
> 
> Ok.
> 
> > 
> > > +
> > > +
> > 
> > one empty line should be enough
> 
> Ok.
> 
> > > diff --git a/drivers/input/misc/mc13783-pwrbutton.c
> > > b/drivers/input/misc/mc13783-pwrbutton.c new file mode 100644
> > > index 0000000..6aee01c
> > > --- /dev/null
> > > +++ b/drivers/input/misc/mc13783-pwrbutton.c
> > > @@ -0,0 +1,288 @@
> > > +/**
> > > + * mc13783-pwrbutton.c - MC13783 Power Button Input Driver
> > > + *
> > > + * Copyright (C) 2011 Philippe Rétornaz
> > > + *
> > > + * Based on twl4030-pwrbutton driver by:
> > > + *     Peter De Schrijver <peter.de-schrijver@nokia.com>
> > > + *     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 implies GPL v2 only? So you either need to clearify here or you
> > need to adapt the MODULE_LICENSE line below to read
> > 
> > 	MODULE_LICENSE("GPL v2");
> 
> Well, I took exactly the same license than the twl4030-pwrbutton. 
> This driver is: MODULE_LICENSE("GPL"), why should I change it ?
So this driver is wrong, too. According to include/linux/module.h, "GPL"
means "GNU Public License v2 or later" and "GPL v2" means "GNU Public
License v2".

> > > --- a/drivers/mfd/mc13xxx-core.c
> > > +++ b/drivers/mfd/mc13xxx-core.c
> > > 
> > > @@ -778,6 +778,10 @@ err_revision:
> > >  		mc13xxx_add_subdevice_pdata(mc13xxx, "%s-led",
> > >  		
> > >  				pdata->leds, sizeof(*pdata->leds));
> > > 
> > > +	if (pdata->flags & MC13XXX_USE_BUTTON)
> > 
> > Why not use
> > 
> > 	if (pdata->buttons)
> > 
> > to detect if the pwrbutton device should be registered?
> 
> To keep consistancy as the others sub-device are registered the same way 
> (regulator, led). I can do it as you propose for the button but IMHO it's a 
> bit strange to have a MC13XXX_USE_* for all the subdevice except the buttons. 
> So should I change ?
It would be a third patch for your commit count to convert regulator and
led, too ;-)

Best regards
Uwe