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Input: add support for OnKey module for DA9052/53 PMIC
On-key Driver for Dialog Semiconductor DA9052/53 PMICs. Signed-off-by: David Dajun Chen <dchen@diasemi.com> Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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/* | ||
* ON pin driver for Dialog DA9052 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. | ||
*/ | ||
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#include <linux/init.h> | ||
#include <linux/input.h> | ||
#include <linux/module.h> | ||
#include <linux/platform_device.h> | ||
#include <linux/workqueue.h> | ||
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#include <linux/mfd/da9052/da9052.h> | ||
#include <linux/mfd/da9052/reg.h> | ||
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struct da9052_onkey { | ||
struct da9052 *da9052; | ||
struct input_dev *input; | ||
struct delayed_work work; | ||
unsigned int irq; | ||
}; | ||
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static void da9052_onkey_query(struct da9052_onkey *onkey) | ||
{ | ||
int key_stat; | ||
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key_stat = da9052_reg_read(onkey->da9052, DA9052_EVENT_B_REG); | ||
if (key_stat < 0) { | ||
dev_err(onkey->da9052->dev, | ||
"Failed to read onkey event %d\n", key_stat); | ||
} else { | ||
/* | ||
* Since interrupt for deassertion of ONKEY pin is not | ||
* generated, onkey event state determines the onkey | ||
* button state. | ||
*/ | ||
key_stat &= DA9052_EVENTB_ENONKEY; | ||
input_report_key(onkey->input, KEY_POWER, key_stat); | ||
input_sync(onkey->input); | ||
} | ||
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/* | ||
* 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(50)); | ||
} | ||
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static void da9052_onkey_work(struct work_struct *work) | ||
{ | ||
struct da9052_onkey *onkey = container_of(work, struct da9052_onkey, | ||
work.work); | ||
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da9052_onkey_query(onkey); | ||
} | ||
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static irqreturn_t da9052_onkey_irq(int irq, void *data) | ||
{ | ||
struct da9052_onkey *onkey = data; | ||
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da9052_onkey_query(onkey); | ||
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return IRQ_HANDLED; | ||
} | ||
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static int __devinit da9052_onkey_probe(struct platform_device *pdev) | ||
{ | ||
struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent); | ||
struct da9052_onkey *onkey; | ||
struct input_dev *input_dev; | ||
int irq; | ||
int error; | ||
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if (!da9052) { | ||
dev_err(&pdev->dev, "Failed to get the driver's data\n"); | ||
return -EINVAL; | ||
} | ||
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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; | ||
} | ||
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onkey = kzalloc(sizeof(*onkey), GFP_KERNEL); | ||
input_dev = input_allocate_device(); | ||
if (!onkey || !input_dev) { | ||
dev_err(&pdev->dev, "Failed to allocate memory\n"); | ||
return -ENOMEM; | ||
} | ||
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onkey->input = input_dev; | ||
onkey->da9052 = da9052; | ||
onkey->irq = irq; | ||
INIT_DELAYED_WORK(&onkey->work, da9052_onkey_work); | ||
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input_dev->name = "da9052-onkey"; | ||
input_dev->phys = "da9052-onkey/input0"; | ||
input_dev->dev.parent = &pdev->dev; | ||
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input_dev->evbit[0] = BIT_MASK(EV_KEY); | ||
__set_bit(KEY_POWER, input_dev->keybit); | ||
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error = request_threaded_irq(onkey->irq, NULL, da9052_onkey_irq, | ||
IRQF_TRIGGER_LOW | IRQF_ONESHOT, | ||
"ONKEY", onkey); | ||
if (error < 0) { | ||
dev_err(onkey->da9052->dev, | ||
"Failed to register ONKEY IRQ %d, error = %d\n", | ||
onkey->irq, error); | ||
goto err_free_mem; | ||
} | ||
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error = input_register_device(onkey->input); | ||
if (error) { | ||
dev_err(&pdev->dev, "Unable to register input device, %d\n", | ||
error); | ||
goto err_free_irq; | ||
} | ||
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platform_set_drvdata(pdev, onkey); | ||
return 0; | ||
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err_free_irq: | ||
free_irq(onkey->irq, onkey); | ||
cancel_delayed_work_sync(&onkey->work); | ||
err_free_mem: | ||
input_free_device(input_dev); | ||
kfree(onkey); | ||
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return error; | ||
} | ||
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static int __devexit da9052_onkey_remove(struct platform_device *pdev) | ||
{ | ||
struct da9052_onkey *onkey = platform_get_drvdata(pdev); | ||
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free_irq(onkey->irq, onkey); | ||
cancel_delayed_work_sync(&onkey->work); | ||
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input_unregister_device(onkey->input); | ||
kfree(onkey); | ||
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return 0; | ||
} | ||
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static struct platform_driver da9052_onkey_driver = { | ||
.probe = da9052_onkey_probe, | ||
.remove = __devexit_p(da9052_onkey_remove), | ||
.driver = { | ||
.name = "da9052-onkey", | ||
.owner = THIS_MODULE, | ||
}, | ||
}; | ||
module_platform_driver(da9052_onkey_driver); | ||
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MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | ||
MODULE_DESCRIPTION("Onkey driver for DA9052"); | ||
MODULE_LICENSE("GPL"); | ||
MODULE_ALIAS("platform:da9052-onkey"); |