input: PCAP2 misc input driver

This is a driver for misc input events for the PCAP2 PMIC, it handles
the Power key and the Headphone button.

Signed-off-by: Daniel Ribeiro <drwyrm@gmail.com>
Signed-off-by: Ilya Petrov <ilya.muromec@gmail.com>
Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 144 insertions, 0 deletions

diff --git a/drivers/input/misc/pcap_keys.c b/drivers/input/misc/pcap_keys.c
new file mode 100644
index 000000000000..7ea969347ca9
--- /dev/null
+++ b/drivers/input/misc/pcap_keys.c
@@ -0,0 +1,144 @@
+/*
+ *  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>
+
+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,
+        }
+};
+
+static int __init pcap_keys_init(void)
+{
+        return platform_driver_register(&pcap_keys_device_driver);
+};
+
+static void __exit pcap_keys_exit(void)
+{
+        platform_driver_unregister(&pcap_keys_device_driver);
+};
+
+module_init(pcap_keys_init);
+module_exit(pcap_keys_exit);
+
+MODULE_DESCRIPTION("Motorola PCAP2 input events driver");
+MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pcap_keys");