[PATCH] PCAP misc input driver (for 2.6.32)

[Daniel Ribeiro <drwyrm@gmail.com>]

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This is a driver for misc input events for the PCAP2 PMIC, it handles
the power button, headphone insertion/removal and the headphone button.

Signed-off-by: Ilya Petrov <ilya.muromec@gmail.com>
Signed-off-by: Daniel Ribeiro <drwyrm@gmail.com>

---
 drivers/input/keyboard/Kconfig     |    7 ++
 drivers/input/keyboard/Makefile    |    1 +
 drivers/input/keyboard/pcap_keys.c |  152 ++++++++++++++++++++++++++++++++++++
 3 files changed, 160 insertions(+), 0 deletions(-)

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 9d8f796..ea512b0 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -353,4 +353,11 @@ config KEYBOARD_EP93XX
 	  To compile this driver as a module, choose M here: the
 	  module will be called ep93xx_keypad.
 
+config KEYBOARD_PCAP
+        tristate "Motorola EZX PCAP events"
+        depends on EZX_PCAP
+        help
+          Say Y here if you want to use power key and jack events
+          on Motorola EZX 2nd generation phones
+
 endif
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 156b647..06b77dd 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -30,3 +30,4 @@ obj-$(CONFIG_KEYBOARD_MAPLE)		+= maple_keyb.o
 obj-$(CONFIG_KEYBOARD_BFIN)		+= bf54x-keys.o
 obj-$(CONFIG_KEYBOARD_SH_KEYSC)		+= sh_keysc.o
 obj-$(CONFIG_KEYBOARD_EP93XX)		+= ep93xx_keypad.o
+obj-$(CONFIG_KEYBOARD_PCAP)		+= pcap_keys.o
diff --git a/drivers/input/keyboard/pcap_keys.c b/drivers/input/keyboard/pcap_keys.c
new file mode 100644
index 0000000..8a9b533
--- /dev/null
+++ b/drivers/input/keyboard/pcap_keys.c
@@ -0,0 +1,152 @@
+/*
+ *  Input driver for PCAP events:
+ *   * Power key
+ *   * Jack plug/unplug
+ *   * 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_HS:
+		input_report_switch(pcap_keys->input,
+				SW_HEADPHONE_INSERT, !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 __init pcap_keys_probe(struct platform_device *pdev)
+{
+	int err = -ENOMEM;
+	struct pcap_keys *pcap_keys;
+
+	pcap_keys = kmalloc(sizeof(struct pcap_keys), GFP_KERNEL);
+	if (!pcap_keys)
+		return err;
+
+	pcap_keys->pcap = platform_get_drvdata(pdev);
+
+	pcap_keys->input = input_allocate_device();
+	if (!pcap_keys->input)
+		goto fail;
+
+	platform_set_drvdata(pdev, pcap_keys);
+	pcap_keys->input->name = pdev->name;
+	pcap_keys->input->phys = "pcap-keys/input0";
+	pcap_keys->input->dev.parent = &pdev->dev;
+
+	pcap_keys->input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_SW);
+	set_bit(KEY_POWER, pcap_keys->input->keybit);
+	set_bit(SW_HEADPHONE_INSERT, pcap_keys->input->swbit);
+	set_bit(KEY_HP, pcap_keys->input->keybit);
+
+	err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF),
+			pcap_keys_handler, 0, "Power key", pcap_keys);
+	if (err)
+		goto fail_dev;
+
+	err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_HS),
+			pcap_keys_handler, 0, "Headphone jack", pcap_keys);
+	if (err)
+		goto fail_pwrkey;
+
+	err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC),
+			pcap_keys_handler, 0, "MIC jack/button", pcap_keys);
+	if (err)
+		goto fail_jack;
+
+	err = input_register_device(pcap_keys->input);
+	if (err)
+		goto fail_mic;
+
+	return 0;
+
+fail_mic:
+	free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC), pcap_keys);
+fail_jack:
+	free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_HS), pcap_keys);
+fail_pwrkey:
+	free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys);
+fail_dev:
+	input_free_device(pcap_keys->input);
+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_HS), 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",
+		.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");
-- 
tg: (22f99ae..) ezx/pcap_keys (depends on: ezx/local/pcap)

-- 
Daniel Ribeiro

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