// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Input driver for PCAP events:
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* * Power key
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* * Headphone button
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*
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* Copyright (c) 2008,2009 Ilya Petrov <ilya.muromec@gmail.com>
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/mfd/ezx-pcap.h>
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#include <linux/slab.h>
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struct pcap_keys {
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struct pcap_chip *pcap;
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struct input_dev *input;
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};
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/* PCAP2 interrupts us on keypress */
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static irqreturn_t pcap_keys_handler(int irq, void *_pcap_keys)
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{
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struct pcap_keys *pcap_keys = _pcap_keys;
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int pirq = irq_to_pcap(pcap_keys->pcap, irq);
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u32 pstat;
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ezx_pcap_read(pcap_keys->pcap, PCAP_REG_PSTAT, &pstat);
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pstat &= 1 << pirq;
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switch (pirq) {
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case PCAP_IRQ_ONOFF:
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input_report_key(pcap_keys->input, KEY_POWER, !pstat);
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break;
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case PCAP_IRQ_MIC:
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input_report_key(pcap_keys->input, KEY_HP, !pstat);
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break;
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}
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input_sync(pcap_keys->input);
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return IRQ_HANDLED;
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}
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static int pcap_keys_probe(struct platform_device *pdev)
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{
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int err = -ENOMEM;
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struct pcap_keys *pcap_keys;
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struct input_dev *input_dev;
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pcap_keys = kmalloc(sizeof(struct pcap_keys), GFP_KERNEL);
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if (!pcap_keys)
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return err;
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pcap_keys->pcap = dev_get_drvdata(pdev->dev.parent);
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input_dev = input_allocate_device();
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if (!input_dev)
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goto fail;
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pcap_keys->input = input_dev;
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platform_set_drvdata(pdev, pcap_keys);
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input_dev->name = pdev->name;
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input_dev->phys = "pcap-keys/input0";
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input_dev->id.bustype = BUS_HOST;
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input_dev->dev.parent = &pdev->dev;
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__set_bit(EV_KEY, input_dev->evbit);
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__set_bit(KEY_POWER, input_dev->keybit);
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__set_bit(KEY_HP, input_dev->keybit);
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err = input_register_device(input_dev);
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if (err)
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goto fail_allocate;
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err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF),
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pcap_keys_handler, 0, "Power key", pcap_keys);
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if (err)
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goto fail_register;
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err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC),
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pcap_keys_handler, 0, "Headphone button", pcap_keys);
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if (err)
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goto fail_pwrkey;
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return 0;
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fail_pwrkey:
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free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys);
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fail_register:
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input_unregister_device(input_dev);
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goto fail;
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fail_allocate:
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input_free_device(input_dev);
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fail:
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kfree(pcap_keys);
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return err;
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}
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static int pcap_keys_remove(struct platform_device *pdev)
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{
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struct pcap_keys *pcap_keys = platform_get_drvdata(pdev);
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free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys);
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free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC), pcap_keys);
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input_unregister_device(pcap_keys->input);
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kfree(pcap_keys);
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return 0;
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}
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static struct platform_driver pcap_keys_device_driver = {
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.probe = pcap_keys_probe,
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.remove = pcap_keys_remove,
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.driver = {
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.name = "pcap-keys",
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}
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};
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module_platform_driver(pcap_keys_device_driver);
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MODULE_DESCRIPTION("Motorola PCAP2 input events driver");
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MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:pcap_keys");
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