/* * Input driver for PCAP events: * * Power key * * Headphone button * * Copyright (c) 2008,2009 Ilya Petrov <ilya.muromec@gmail.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * */ #include <linux/module.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/input.h> #include <linux/mfd/ezx-pcap.h> #include <linux/slab.h> struct pcap_keys { struct pcap_chip *pcap; struct input_dev *input; }; /* PCAP2 interrupts us on keypress */ static irqreturn_t pcap_keys_handler(int irq, void *_pcap_keys) { struct pcap_keys *pcap_keys = _pcap_keys; int pirq = irq_to_pcap(pcap_keys->pcap, irq); u32 pstat; ezx_pcap_read(pcap_keys->pcap, PCAP_REG_PSTAT, &pstat); pstat &= 1 << pirq; switch (pirq) { case PCAP_IRQ_ONOFF: input_report_key(pcap_keys->input, KEY_POWER, !pstat); break; case PCAP_IRQ_MIC: input_report_key(pcap_keys->input, KEY_HP, !pstat); break; } input_sync(pcap_keys->input); return IRQ_HANDLED; } static int __devinit pcap_keys_probe(struct platform_device *pdev) { int err = -ENOMEM; struct pcap_keys *pcap_keys; struct input_dev *input_dev; pcap_keys = kmalloc(sizeof(struct pcap_keys), GFP_KERNEL); if (!pcap_keys) return err; pcap_keys->pcap = dev_get_drvdata(pdev->dev.parent); input_dev = input_allocate_device(); if (!input_dev) goto fail; pcap_keys->input = input_dev; platform_set_drvdata(pdev, pcap_keys); input_dev->name = pdev->name; input_dev->phys = "pcap-keys/input0"; input_dev->id.bustype = BUS_HOST; input_dev->dev.parent = &pdev->dev; __set_bit(EV_KEY, input_dev->evbit); __set_bit(KEY_POWER, input_dev->keybit); __set_bit(KEY_HP, input_dev->keybit); err = input_register_device(input_dev); if (err) goto fail_allocate; err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys_handler, 0, "Power key", pcap_keys); if (err) goto fail_register; err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC), pcap_keys_handler, 0, "Headphone button", pcap_keys); if (err) goto fail_pwrkey; return 0; fail_pwrkey: free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys); fail_register: input_unregister_device(input_dev); goto fail; fail_allocate: input_free_device(input_dev); fail: kfree(pcap_keys); return err; } static int __devexit pcap_keys_remove(struct platform_device *pdev) { struct pcap_keys *pcap_keys = platform_get_drvdata(pdev); free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys); free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC), pcap_keys); input_unregister_device(pcap_keys->input); kfree(pcap_keys); return 0; } static struct platform_driver pcap_keys_device_driver = { .probe = pcap_keys_probe, .remove = __devexit_p(pcap_keys_remove), .driver = { .name = "pcap-keys", .owner = THIS_MODULE, } }; module_platform_driver(pcap_keys_device_driver); MODULE_DESCRIPTION("Motorola PCAP2 input events driver"); MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:pcap_keys");