Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / input / misc / pcap_keys.c

diff --git a/kernel/drivers/input/misc/pcap_keys.c b/kernel/drivers/input/misc/pcap_keys.c
new file mode 100644 (file)
index 0000000..3b81daf
--- /dev/null
+++ b/kernel/drivers/input/misc/pcap_keys.c
@@ -0,0 +1,131 @@
+/*
+ *  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/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 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 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         = pcap_keys_remove,
+       .driver         = {
+               .name   = "pcap-keys",
+       }
+};
+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");