Re: [PATCH 7/8] input: misc: Add TWL6030 power button support to twl-pwrbutton

Paul Kocialkowski
2016-04-02T20:30:55Z

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Hi,

Le mercredi 30 mars 2016 à 19:16 +0300, Grygorii Strashko a écrit :
> On 03/29/2016 10:22 PM, Paul Kocialkowski wrote:
> >
> > This renames the twl4030-pwrbutton driver to twl-pwrbutton, since power
> > button
> > handling is very similar on most TWL chips. This also introduces TWL6030
> > power
> > button support.
> >
> > TWL6030 power button support requires the following additional changes:
> > * Devicetree binding and support
> > * Interrupt unmasking and remasking support
>
> Again. pls, do not mix clean up/beautification and adding new features.
> And don't mix DT changes with code changes.

Thanks for the review!

I'll split that one into smaller logical chunks then.

> > Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
> > ---
> >   .../devicetree/bindings/input/twl-pwrbutton.txt    |  22 ++++
> >   .../bindings/input/twl4030-pwrbutton.txt           |  21 ---
> >   arch/arm/boot/dts/twl6030.dtsi                     |   5 +
> >   arch/arm/configs/omap2plus_defconfig               |   2 +-
> >   drivers/input/misc/Kconfig                         |   8 +-
> >   drivers/input/misc/Makefile                        |   2 +-
> >   drivers/input/misc/twl-pwrbutton.c                 | 143
> > +++++++++++++++++++++
> >   drivers/input/misc/twl4030-pwrbutton.c             | 116 -----------------
> >   drivers/mfd/twl-core.c                             |  12 +-
> >   include/linux/i2c/twl.h                            |   1 +
> >   10 files changed, 187 insertions(+), 145 deletions(-)
> >   create mode 100644 Documentation/devicetree/bindings/input/twl-
> > pwrbutton.txt
> >   delete mode 100644 Documentation/devicetree/bindings/input/twl4030-
> > pwrbutton.txt
> >   create mode 100644 drivers/input/misc/twl-pwrbutton.c
> >   delete mode 100644 drivers/input/misc/twl4030-pwrbutton.c
> >
> > diff --git a/Documentation/devicetree/bindings/input/twl-pwrbutton.txt
> > b/Documentation/devicetree/bindings/input/twl-pwrbutton.txt
> > new file mode 100644
> > index 0000000..4931be4
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/input/twl-pwrbutton.txt
> > @@ -0,0 +1,22 @@
> > +Texas Instruments TWL family pwrbutton module
> > +
> > +This module is part of a TWL chip. For more details about the whole
> > +chip see Documentation/devicetree/bindings/mfd/twl-familly.txt.
> > +
> > +This module provides a simple power button event via an Interrupt.
> > +
> > +Required properties:
> > +- compatible: should be one of the following
> > +   - "ti,twl4030-pwrbutton": For controllers compatible with twl4030
> > +   - "ti,twl6030-pwrbutton": For controllers compatible with twl6030
> > +- interrupts: should be one of the following
> > +   - <8>: For controllers compatible with the twl
> > +
> > +Example:
> > +
> > +&twl {
> > + twl_pwrbutton: pwrbutton {
> > + compatible = "ti,twl4030-pwrbutton";
> > + interrupts = <8>;
> > + };
> > +};
> > diff --git a/Documentation/devicetree/bindings/input/twl4030-pwrbutton.txt
> > b/Documentation/devicetree/bindings/input/twl4030-pwrbutton.txt
> > deleted file mode 100644
> > index c864a46..0000000
> > --- a/Documentation/devicetree/bindings/input/twl4030-pwrbutton.txt
> > +++ /dev/null
> > @@ -1,21 +0,0 @@
> > -Texas Instruments TWL family (twl4030) pwrbutton module
> > -
> > -This module is part of the TWL4030. For more details about the whole
> > -chip see Documentation/devicetree/bindings/mfd/twl-familly.txt.
> > -
> > -This module provides a simple power button event via an Interrupt.
> > -
> > -Required properties:
> > -- compatible: should be one of the following
> > -   - "ti,twl4030-pwrbutton": For controllers compatible with twl4030
> > -- interrupts: should be one of the following
> > -   - <8>: For controllers compatible with twl4030
> > -
> > -Example:
> > -
> > -&twl {
> > - twl_pwrbutton: pwrbutton {
> > - compatible = "ti,twl4030-pwrbutton";
> > - interrupts = <8>;
> > - };
> > -};
> > diff --git a/arch/arm/boot/dts/twl6030.dtsi b/arch/arm/boot/dts/twl6030.dtsi
> > index 55eb35f..6a52df1 100644
> > --- a/arch/arm/boot/dts/twl6030.dtsi
> > +++ b/arch/arm/boot/dts/twl6030.dtsi
> > @@ -99,4 +99,9 @@
> >    compatible = "ti,twl6030-pwmled";
> >    #pwm-cells = <2>;
> >    };
> > +
> > + twl_pwrbutton: pwrbutton {
> > + compatible = "ti,twl6030-pwrbutton";
> > + interrupts = <0>;
> > + };
> >   };
> > diff --git a/arch/arm/configs/omap2plus_defconfig
> > b/arch/arm/configs/omap2plus_defconfig
> > index 156bc88..ff9752a 100644
> > --- a/arch/arm/configs/omap2plus_defconfig
> > +++ b/arch/arm/configs/omap2plus_defconfig
> > @@ -217,7 +217,7 @@ CONFIG_TOUCHSCREEN_TSC2007=m
> >   CONFIG_TOUCHSCREEN_TI_AM335X_TSC=m
> >   CONFIG_INPUT_MISC=y
> >   CONFIG_INPUT_TPS65218_PWRBUTTON=m
> > -CONFIG_INPUT_TWL4030_PWRBUTTON=m
> > +CONFIG_INPUT_TWL_PWRBUTTON=m
> >   CONFIG_INPUT_PALMAS_PWRBUTTON=m
> >   CONFIG_SERIO=m
> >   # CONFIG_LEGACY_PTYS is not set
> > diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
> > index 6abb6df..f643e14 100644
> > --- a/drivers/input/misc/Kconfig
> > +++ b/drivers/input/misc/Kconfig
> > @@ -459,15 +459,15 @@ config INPUT_AXP20X_PEK
> >      be called axp20x-pek.
> >
> >
> > -config INPUT_TWL4030_PWRBUTTON
> > - tristate "TWL4030 Power button Driver"
> > +config INPUT_TWL_PWRBUTTON
> > + tristate "TWL Power button Driver"
> >    depends on TWL_CORE
> >    help
> >      Say Y here if you want to enable power key reporting via the
> > -   TWL4030 family of chips.
> > +   TWL family of chips.
> >
> >      To compile this driver as a module, choose M here. The module
> > will
> > -   be called twl4030_pwrbutton.
> > +   be called twl_pwrbutton.
> >
> >   config INPUT_TWL4030_VIBRA
> >    tristate "Support for TWL4030 Vibrator"
> > diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
> > index 0357a08..f77f5e7 100644
> > --- a/drivers/input/misc/Makefile
> > +++ b/drivers/input/misc/Makefile
> > @@ -66,7 +66,7 @@ obj-$(CONFIG_INPUT_SIRFSOC_ONKEY) += sirfsoc-
> > onkey.o
> >   obj-$(CONFIG_INPUT_SOC_BUTTON_ARRAY) += soc_button_array.o
> >   obj-$(CONFIG_INPUT_SPARCSPKR) += sparcspkr.o
> >   obj-$(CONFIG_INPUT_TPS65218_PWRBUTTON) += tps65218-pwrbutton.o
> > -obj-$(CONFIG_INPUT_TWL4030_PWRBUTTON) += twl4030-pwrbutton.o
> > +obj-$(CONFIG_INPUT_TWL_PWRBUTTON) += twl-pwrbutton.o
> >   obj-$(CONFIG_INPUT_TWL4030_VIBRA) += twl4030-vibra.o
> >   obj-$(CONFIG_INPUT_TWL6040_VIBRA) += twl6040-vibra.o
> >   obj-$(CONFIG_INPUT_UINPUT) += uinput.o
> > diff --git a/drivers/input/misc/twl-pwrbutton.c b/drivers/input/misc/twl-
> > pwrbutton.c
> > new file mode 100644
> > index 0000000..a7bc8ad
> > --- /dev/null
> > +++ b/drivers/input/misc/twl-pwrbutton.c
> > @@ -0,0 +1,143 @@
> > +/**
> > + * twl4030-pwrbutton.c - TWL4030 Power Button Input Driver

This should probably be changed, by the way.

> > + * 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/twl.h>
> > +
> > +#define PWR_PWRON_IRQ (1 << 0)
> > +
> > +#define TWL4030_STS_HW_CONDITIONS 0x0f
> > +#define TWL6030_STS_HW_CONDITIONS 0x21
> > +
> > +static irqreturn_t powerbutton_irq(int irq, void *_pwr)
> > +{
> > + struct input_dev *pwr = _pwr;
> > + int err;
> > + u8 value;
> > +
> > + if (twl_class_is_4030())
> one of the benefits of using DT is that we can get rid of code
> like above - compatible string should provide enough info.

I fully agree with you here, especially given what twl_class_is_4030 is actually
doing.

If we're not going to use platform data at all for supporting twl6030 on this
driver, let's just fallback to twl4030 when dt is not used.

> > + err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &value,
> > + TWL4030_STS_HW_CONDITIONS);
> > + else
> > + err = twl_i2c_read_u8(TWL6030_MODULE_ID0, &value,
> > + TWL6030_STS_HW_CONDITIONS);
> > +
> > + if (!err)  {
> > + pm_wakeup_event(pwr->dev.parent, 0);
> > + 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 twl_pwrbutton_probe(struct platform_device *pdev)
> > +{
> > + struct input_dev *pwr;
> > + int irq = platform_get_irq(pdev, 0);
> It may fail ?! and return -EPROBE_DEFER

Fair enough, not that this is inherited from the previous driver, but a cleanup
won't hurt. I should probably have formatted the patch with -M though.

> > + int err;
> > +
> > + pwr = devm_input_allocate_device(&pdev->dev);
> > + if (!pwr) {
> > + dev_err(&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 = "twl_pwrbutton";
> > + pwr->phys = "twl_pwrbutton/input0";
> > + pwr->dev.parent = &pdev->dev;
> > +
> > + if (twl_class_is_6030()) {
> > + twl6030_interrupt_unmask(TWL6030_PWRON_INT_MASK,
> > + REG_INT_MSK_LINE_A);
> > + twl6030_interrupt_unmask(TWL6030_PWRON_INT_MASK,
> > + REG_INT_MSK_STS_A);
> Seems it's time to update twl6030-irq.c and add enable_irq()/disable_irq()
> functionality.

I'll look into that.

> >
> > + }
> > +
> > + err = devm_request_threaded_irq(&pwr->dev, irq, NULL,
> > powerbutton_irq,
> > + IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
> > + IRQF_ONESHOT,
> > + "twl_pwrbutton", pwr);
> > + if (err < 0) {
> > + dev_err(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n",
> > err);
> > + return err;
> > + }
> > +
> > + err = input_register_device(pwr);
> > + if (err) {
> > + dev_err(&pdev->dev, "Can't register power button: %d\n",
> > err);
> > + return err;
> > + }
> > +
> > + platform_set_drvdata(pdev, pwr);
> > + device_init_wakeup(&pdev->dev, true);
> > +
> > + return 0;
> > +}
> > +
> > +static int twl_pwrbutton_remove(struct platform_device *pdev)
> > +{
> > + if (twl_class_is_6030()) {
> > + twl6030_interrupt_mask(TWL6030_PWRON_INT_MASK,
> > + REG_INT_MSK_LINE_A);
> > + twl6030_interrupt_mask(TWL6030_PWRON_INT_MASK,
> > + REG_INT_MSK_STS_A);
> > + }
> device_init_wakeup(&pdev->dev, 0);
>
>
> >
> > +
> > + return 0;
> > +}
> > +
> > +#ifdef CONFIG_OF
> > +static const struct of_device_id twl_pwrbutton_dt_match_table[] = {
> > +       { .compatible = "ti,twl4030-pwrbutton" },
> > +       { .compatible = "ti,twl6030-pwrbutton" },
> > +       {},
> > +};
> > +MODULE_DEVICE_TABLE(of, twl_pwrbutton_dt_match_table);
> > +#endif
> > +
> > +static struct platform_driver twl_pwrbutton_driver = {
> > + .probe = twl_pwrbutton_probe,
> > + .remove = twl_pwrbutton_remove,
> > + .driver = {
> > + .name = "twl_pwrbutton",
> > + .of_match_table =
> > of_match_ptr(twl_pwrbutton_dt_match_table),
> > + },
> > +};
> > +module_platform_driver(twl_pwrbutton_driver);
> > +
> > +MODULE_ALIAS("platform:twl_pwrbutton");
> > +MODULE_DESCRIPTION("TWL Power Button");
> > +MODULE_LICENSE("GPL");
> > +MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>");
> > +MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
> > diff --git a/drivers/input/misc/twl4030-pwrbutton.c
> > b/drivers/input/misc/twl4030-pwrbutton.c
> > deleted file mode 100644
> > index 603fc2f..0000000
> > --- a/drivers/input/misc/twl4030-pwrbutton.c
> > +++ /dev/null
> > @@ -1,116 +0,0 @@
> > -/**
> > - * 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/twl.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;
> > -
> > - err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &value,
> > STS_HW_CONDITIONS);
> > - if (!err)  {
> > - pm_wakeup_event(pwr->dev.parent, 0);
> > - 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 twl4030_pwrbutton_probe(struct platform_device *pdev)
> > -{
> > - struct input_dev *pwr;
> > - int irq = platform_get_irq(pdev, 0);
> > - int err;
> > -
> > - pwr = devm_input_allocate_device(&pdev->dev);
> > - if (!pwr) {
> > - dev_err(&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 = devm_request_threaded_irq(&pwr->dev, irq, NULL,
> > powerbutton_irq,
> > - IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
> > - IRQF_ONESHOT,
> > - "twl4030_pwrbutton", pwr);
> > - if (err < 0) {
> > - dev_err(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n",
> > err);
> > - return err;
> > - }
> > -
> > - err = input_register_device(pwr);
> > - if (err) {
> > - dev_err(&pdev->dev, "Can't register power button: %d\n",
> > err);
> > - return err;
> > - }
> > -
> > - platform_set_drvdata(pdev, pwr);
> > - device_init_wakeup(&pdev->dev, true);
> > -
> > - return 0;
> > -}
> > -
> > -#ifdef CONFIG_OF
> > -static const struct of_device_id twl4030_pwrbutton_dt_match_table[] = {
> > -       { .compatible = "ti,twl4030-pwrbutton" },
> > -       {},
> > -};
> > -MODULE_DEVICE_TABLE(of, twl4030_pwrbutton_dt_match_table);
> > -#endif
> > -
> > -static struct platform_driver twl4030_pwrbutton_driver = {
> > - .probe = twl4030_pwrbutton_probe,
> > - .driver = {
> > - .name = "twl4030_pwrbutton",
> > - .of_match_table =
> > of_match_ptr(twl4030_pwrbutton_dt_match_table),
> > - },
> > -};
> > -module_platform_driver(twl4030_pwrbutton_driver);
> > -
> > -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>");
> > -
> > diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
> > index 74372bc..a1bfe23 100644
> > --- a/drivers/mfd/twl-core.c
> > +++ b/drivers/mfd/twl-core.c
> > @@ -848,13 +848,21 @@ add_children(struct twl_platform_data *pdata, unsigned
> > irq_base,
> >    return PTR_ERR(child);
> >    }
> >
> > - if (IS_ENABLED(CONFIG_INPUT_TWL4030_PWRBUTTON) &&
> > twl_class_is_4030()) {
> > - child = add_child(TWL_MODULE_PM_MASTER,
> > "twl4030_pwrbutton",
> > + if (IS_ENABLED(CONFIG_INPUT_TWL_PWRBUTTON) && twl_class_is_4030())
> > {
> > + child = add_child(TWL_MODULE_PM_MASTER, "twl_pwrbutton",
> >      NULL, 0, true, irq_base + 8 + 0, 0);
> >    if (IS_ERR(child))
> >    return PTR_ERR(child);
> >    }
> >
> > + if (IS_ENABLED(CONFIG_INPUT_TWL_PWRBUTTON) && twl_class_is_6030())
> > {
> > + child = add_child(TWL_MODULE_PM_MASTER, "twl_pwrbutton",
> > +   NULL, 0, true, irq_base + 0, 0);
> > + if (IS_ERR(child))
> > + return PTR_ERR(child);
> > + }
> > +
> no legacy code for twl6030 pls

That's fine with me.

> >
> > +
> >    if (IS_ENABLED(CONFIG_MFD_TWL4030_AUDIO) && pdata->audio &&
> >        twl_class_is_4030()) {
> >    child = add_child(TWL4030_MODULE_AUDIO_VOICE, "twl4030-
> > audio",
> > diff --git a/include/linux/i2c/twl.h b/include/linux/i2c/twl.h
> > index 2decb190..20d33b7 100644
> > --- a/include/linux/i2c/twl.h
> > +++ b/include/linux/i2c/twl.h
> > @@ -127,6 +127,7 @@ enum twl6030_module_ids {
> >   #define REG_INT_MSK_STS_C 0x08
> >
> >   /* MASK INT REG GROUP A */
> > +#define TWL6030_PWRON_INT_MASK 0x01
> >   #define TWL6030_PWR_INT_MASK  0x07
> >   #define TWL6030_RTC_INT_MASK  0x18
> >   #define TWL6030_HOTDIE_INT_MASK  0x20
> >
>

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