Re: [Patch v4 7/7] Onkey: DA9055 Onkey driver

[Ashish Jangam <ashish.jangam@kpitcummins.com>]

Does this patch looks good?
On Fri, 2012-10-12 at 15:02 +0530, Ashish Jangam wrote:
> This is the ONKEY driver of the Dialog DA9055 PMIC and depends on the DA9055 MFD
> core driver.
> 
> This patch is functionally tested on SMDK6410 board.
> 
> Signed-off-by: David Dajun Chen <dchen@diasemi.com>
> Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
> ---
> changes since v4:
> - remove of devm_*irq API
> changes since v3:
> - used of module_platform_driver macro
> - add regmap virtual irq function
> changes since v2:
> - add support for handling the button release case
> ---
>  drivers/input/misc/Kconfig        |   10 ++
>  drivers/input/misc/Makefile       |    1 +
>  drivers/input/misc/da9055_onkey.c |  171 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 182 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/input/misc/da9055_onkey.c
> 
> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
> index 7c0f1ec..6a45cb8 100644
> --- a/drivers/input/misc/Kconfig
> +++ b/drivers/input/misc/Kconfig
> @@ -486,6 +486,16 @@ config INPUT_DA9052_ONKEY
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called da9052_onkey.
>  
> +config INPUT_DA9055_ONKEY
> +	tristate "Dialog Semiconductor DA9055 ONKEY"
> +	depends on MFD_DA9055
> +	help
> +	  Support the ONKEY of DA9055 PMICs as an input device
> +	  reporting power button status.
> +
> +	  To compile this driver as a module, choose M here: the module
> +	  will be called da9055_onkey.
> +
>  config INPUT_DM355EVM
>  	tristate "TI DaVinci DM355 EVM Keypad and IR Remote"
>  	depends on MFD_DM355EVM_MSP
> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
> index 83fe6f5..23347e3 100644
> --- a/drivers/input/misc/Makefile
> +++ b/drivers/input/misc/Makefile
> @@ -23,6 +23,7 @@ obj-$(CONFIG_INPUT_CMA3000)		+= cma3000_d0x.o
>  obj-$(CONFIG_INPUT_CMA3000_I2C)		+= cma3000_d0x_i2c.o
>  obj-$(CONFIG_INPUT_COBALT_BTNS)		+= cobalt_btns.o
>  obj-$(CONFIG_INPUT_DA9052_ONKEY)	+= da9052_onkey.o
> +obj-$(CONFIG_INPUT_DA9055_ONKEY)	+= da9055_onkey.o
>  obj-$(CONFIG_INPUT_DM355EVM)		+= dm355evm_keys.o
>  obj-$(CONFIG_INPUT_GP2A)		+= gp2ap002a00f.o
>  obj-$(CONFIG_INPUT_GPIO_TILT_POLLED)	+= gpio_tilt_polled.o
> diff --git a/drivers/input/misc/da9055_onkey.c b/drivers/input/misc/da9055_onkey.c
> new file mode 100644
> index 0000000..217b5ee
> --- /dev/null
> +++ b/drivers/input/misc/da9055_onkey.c
> @@ -0,0 +1,171 @@
> +/*
> + * ON pin driver for Dialog DA9055 PMICs
> + *
> + * Copyright(c) 2012 Dialog Semiconductor Ltd.
> + *
> + * Author: David Dajun Chen <dchen@diasemi.com>
> + *
> + * This program is free software; you can redistribute  it and/or modify it
> + * under  the terms of  the GNU General  Public License as published by the
> + * Free Software Foundation;  either version 2 of the  License, or (at your
> + * option) any later version.
> + */
> +
> +#include <linux/init.h>
> +#include <linux/input.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +
> +#include <linux/mfd/da9055/core.h>
> +#include <linux/mfd/da9055/reg.h>
> +
> +struct da9055_onkey {
> +	struct da9055 *da9055;
> +	struct input_dev *input;
> +	struct delayed_work work;
> +};
> +
> +static void da9055_onkey_query(struct da9055_onkey *onkey)
> +{
> +	int key_stat;
> +
> +	key_stat = da9055_reg_read(onkey->da9055, DA9055_REG_STATUS_A);
> +	if (key_stat < 0) {
> +		dev_err(onkey->da9055->dev,
> +			"Failed to read onkey event %d\n", key_stat);
> +	} else {
> +		key_stat &= DA9055_NOKEY_STS;
> +		/*
> +		 * Onkey status bit is cleared when onkey button is relased.
> +		 */
> +		if (!key_stat) {
> +			input_report_key(onkey->input, KEY_POWER, 0);
> +			input_sync(onkey->input);
> +		}
> +	}
> +
> +	/*
> +	 * Interrupt is generated only when the ONKEY pin is asserted.
> +	 * Hence the deassertion of the pin is simulated through work queue.
> +	 */
> +	if (key_stat)
> +		schedule_delayed_work(&onkey->work, msecs_to_jiffies(10));
> +
> +}
> +
> +static void da9055_onkey_work(struct work_struct *work)
> +{
> +	struct da9055_onkey *onkey = container_of(work, struct da9055_onkey,
> +						  work.work);
> +
> +	da9055_onkey_query(onkey);
> +}
> +
> +static irqreturn_t da9055_onkey_irq(int irq, void *data)
> +{
> +	struct da9055_onkey *onkey = data;
> +
> +	input_report_key(onkey->input, KEY_POWER, 1);
> +	input_sync(onkey->input);
> +
> +	da9055_onkey_query(onkey);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int __devinit da9055_onkey_probe(struct platform_device *pdev)
> +{
> +	struct input_dev *input_dev;
> +	struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
> +	struct da9055_onkey *onkey;
> +	int irq, err;
> +
> +	irq = platform_get_irq_byname(pdev, "ONKEY");
> +	if (irq < 0) {
> +		dev_err(&pdev->dev,
> +			"Failed to get an IRQ for input device, %d\n", irq);
> +		return -EINVAL;
> +	}
> +
> +	onkey = devm_kzalloc(&pdev->dev, sizeof(*onkey), GFP_KERNEL);
> +	if (!onkey) {
> +		dev_err(&pdev->dev, "Failed to allocate memory\n");
> +		return -ENOMEM;
> +	}
> +
> +	input_dev = input_allocate_device();
> +	if (!input_dev) {
> +		dev_err(&pdev->dev, "Failed to allocate memory\n");
> +		return -ENOMEM;
> +	}
> +
> +	onkey->input = input_dev;
> +	onkey->da9055 = da9055;
> +	input_dev->name = "da9055-onkey";
> +	input_dev->phys = "da9055-onkey/input0";
> +	input_dev->dev.parent = &pdev->dev;
> +
> +	input_dev->evbit[0] = BIT_MASK(EV_KEY);
> +	__set_bit(KEY_POWER, input_dev->keybit);
> +
> +	INIT_DELAYED_WORK(&onkey->work, da9055_onkey_work);
> +
> +	irq = regmap_irq_get_virq(da9055->irq_data, irq);
> +	err = request_threaded_irq(irq, NULL, da9055_onkey_irq,
> +				   IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
> +				   "ONKEY", onkey);
> +	if (err < 0) {
> +		dev_err(&pdev->dev,
> +			"Failed to register ONKEY IRQ %d, error = %d\n",
> +			irq, err);
> +		goto free_onkey;
> +	}
> +
> +	err = input_register_device(input_dev);
> +	if (err) {
> +		dev_err(&pdev->dev, "Unable to register input device, %d\n",
> +			err);
> +		goto free_irq;
> +	}
> +
> +	platform_set_drvdata(pdev, onkey);
> +
> +	return 0;
> +
> +free_irq:
> +	free_irq(irq, onkey);
> +free_onkey:
> +	cancel_delayed_work_sync(&onkey->work);
> +	input_free_device(input_dev);
> +
> +	return err;
> +}
> +
> +static int __devexit da9055_onkey_remove(struct platform_device *pdev)
> +{
> +	struct da9055_onkey *onkey = platform_get_drvdata(pdev);
> +	int irq = platform_get_irq_byname(pdev, "ONKEY");
> +
> +	irq = regmap_irq_get_virq(onkey->da9055->irq_data, irq);
> +	free_irq(irq, onkey);
> +	cancel_delayed_work_sync(&onkey->work);
> +	input_unregister_device(onkey->input);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver da9055_onkey_driver = {
> +	.probe	= da9055_onkey_probe,
> +	.remove	= __devexit_p(da9055_onkey_remove),
> +	.driver = {
> +		.name	= "da9055-onkey",
> +		.owner	= THIS_MODULE,
> +	},
> +};
> +
> +module_platform_driver(da9055_onkey_driver);
> +
> +MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
> +MODULE_DESCRIPTION("Onkey driver for DA9055");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:da9055-onkey");