/* * 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/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 released. */ 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 da9055_onkey_probe(struct platform_device *pdev) { struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent); struct da9055_onkey *onkey; struct input_dev *input_dev; 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); 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 err_free_input; } err = input_register_device(input_dev); if (err) { dev_err(&pdev->dev, "Unable to register input device, %d\n", err); goto err_free_irq; } platform_set_drvdata(pdev, onkey); return 0; err_free_irq: free_irq(irq, onkey); cancel_delayed_work_sync(&onkey->work); err_free_input: input_free_device(input_dev); return err; } static int 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 = da9055_onkey_remove, .driver = { .name = "da9055-onkey", }, }; 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");