154 lines
3.7 KiB
C
154 lines
3.7 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* License Terms: GNU General Public License v2
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* Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
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*
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* AB8500 Power-On Key handler
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/abx500/ab8500.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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/**
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* struct ab8500_ponkey - ab8500 ponkey information
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* @input_dev: pointer to input device
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* @ab8500: ab8500 parent
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* @irq_dbf: irq number for falling transition
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* @irq_dbr: irq number for rising transition
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*/
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struct ab8500_ponkey {
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struct input_dev *idev;
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struct ab8500 *ab8500;
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int irq_dbf;
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int irq_dbr;
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};
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/* AB8500 gives us an interrupt when ONKEY is held */
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static irqreturn_t ab8500_ponkey_handler(int irq, void *data)
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{
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struct ab8500_ponkey *ponkey = data;
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if (irq == ponkey->irq_dbf)
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input_report_key(ponkey->idev, KEY_POWER, true);
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else if (irq == ponkey->irq_dbr)
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input_report_key(ponkey->idev, KEY_POWER, false);
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input_sync(ponkey->idev);
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return IRQ_HANDLED;
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}
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static int ab8500_ponkey_probe(struct platform_device *pdev)
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{
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struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
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struct ab8500_ponkey *ponkey;
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struct input_dev *input;
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int irq_dbf, irq_dbr;
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int error;
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irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF");
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if (irq_dbf < 0) {
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dev_err(&pdev->dev, "No IRQ for ONKEY_DBF, error=%d\n", irq_dbf);
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return irq_dbf;
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}
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irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR");
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if (irq_dbr < 0) {
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dev_err(&pdev->dev, "No IRQ for ONKEY_DBR, error=%d\n", irq_dbr);
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return irq_dbr;
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}
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ponkey = kzalloc(sizeof(struct ab8500_ponkey), GFP_KERNEL);
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input = input_allocate_device();
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if (!ponkey || !input) {
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error = -ENOMEM;
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goto err_free_mem;
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}
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ponkey->idev = input;
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ponkey->ab8500 = ab8500;
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ponkey->irq_dbf = irq_dbf;
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ponkey->irq_dbr = irq_dbr;
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input->name = "AB8500 POn(PowerOn) Key";
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input->dev.parent = &pdev->dev;
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input_set_capability(input, EV_KEY, KEY_POWER);
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error = request_any_context_irq(ponkey->irq_dbf, ab8500_ponkey_handler,
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0, "ab8500-ponkey-dbf", ponkey);
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if (error < 0) {
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dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n",
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ponkey->irq_dbf, error);
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goto err_free_mem;
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}
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error = request_any_context_irq(ponkey->irq_dbr, ab8500_ponkey_handler,
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0, "ab8500-ponkey-dbr", ponkey);
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if (error < 0) {
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dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n",
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ponkey->irq_dbr, error);
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goto err_free_dbf_irq;
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}
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error = input_register_device(ponkey->idev);
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if (error) {
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dev_err(ab8500->dev, "Can't register input device: %d\n", error);
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goto err_free_dbr_irq;
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}
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platform_set_drvdata(pdev, ponkey);
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return 0;
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err_free_dbr_irq:
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free_irq(ponkey->irq_dbr, ponkey);
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err_free_dbf_irq:
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free_irq(ponkey->irq_dbf, ponkey);
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err_free_mem:
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input_free_device(input);
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kfree(ponkey);
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return error;
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}
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static int ab8500_ponkey_remove(struct platform_device *pdev)
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{
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struct ab8500_ponkey *ponkey = platform_get_drvdata(pdev);
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free_irq(ponkey->irq_dbf, ponkey);
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free_irq(ponkey->irq_dbr, ponkey);
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input_unregister_device(ponkey->idev);
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kfree(ponkey);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id ab8500_ponkey_match[] = {
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{ .compatible = "stericsson,ab8500-ponkey", },
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{}
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};
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#endif
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static struct platform_driver ab8500_ponkey_driver = {
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.driver = {
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.name = "ab8500-poweron-key",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(ab8500_ponkey_match),
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},
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.probe = ab8500_ponkey_probe,
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.remove = ab8500_ponkey_remove,
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};
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module_platform_driver(ab8500_ponkey_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
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MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");
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