Patchwork [RFC,v2,2/4] OMAP4: Keyboard controller support

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Submitter Abraham Arce
Date May 13, 2010, 8:50 p.m.
Message ID <27F9C60D11D683428E133F85D2BB4A53043E113BFA@dlee03.ent.ti.com>
Download mbox | patch
Permalink /patch/99430/
State New, archived
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Patch

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 64c1023..9e1c5d5 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -403,6 +403,16 @@  config KEYBOARD_OMAP
 	  To compile this driver as a module, choose M here: the
 	  module will be called omap-keypad.
 
+config KEYBOARD_OMAP4
+        tristate "TI OMAP4 keypad support"
+        depends on ARCH_OMAP4
+	default n
+        help
+          Say Y here if you want to use the OMAP4 keypad.
+
+          To compile this driver as a module, choose M here: the
+          module will be called omap-keypad.
+
 config KEYBOARD_TWL4030
 	tristate "TI TWL4030/TWL5030/TPS659x0 keypad support"
 	depends on TWL4030_CORE
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 706c6b5..7e2987e 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -28,6 +28,7 @@  obj-$(CONFIG_KEYBOARD_MATRIX)		+= matrix_keypad.o
 obj-$(CONFIG_KEYBOARD_MAX7359)		+= max7359_keypad.o
 obj-$(CONFIG_KEYBOARD_NEWTON)		+= newtonkbd.o
 obj-$(CONFIG_KEYBOARD_OMAP)		+= omap-keypad.o
+obj-$(CONFIG_KEYBOARD_OMAP4)		+= omap4-keypad.o
 obj-$(CONFIG_KEYBOARD_OPENCORES)	+= opencores-kbd.o
 obj-$(CONFIG_KEYBOARD_PXA27x)		+= pxa27x_keypad.o
 obj-$(CONFIG_KEYBOARD_PXA930_ROTARY)	+= pxa930_rotary.o
diff --git a/drivers/input/keyboard/omap4-keypad.c b/drivers/input/keyboard/omap4-keypad.c
new file mode 100644
index 0000000..e8bac82
--- /dev/null
+++ b/drivers/input/keyboard/omap4-keypad.c
@@ -0,0 +1,304 @@ 
+/*
+ * omap4-keypad.c
+ *
+ * OMAP4 Keypad Driver
+ *
+ * Copyright (C) 2010 Texas Instruments
+ *
+ * Author: Abraham Arce <x0066660@ti.com>
+ * Initial Code: Syed Rafiuddin <rafiuddin.syed@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/input.h>
+#include <linux/input/matrix_keypad.h>
+#include <linux/slab.h>
+
+/* OMAP4 registers */
+#define OMAP4_KBD_REVISION		0x00
+#define OMAP4_KBD_SYSCONFIG		0x10
+#define OMAP4_KBD_SYSSTATUS		0x14
+#define OMAP4_KBD_IRQSTATUS		0x18
+#define OMAP4_KBD_IRQENABLE		0x1C
+#define OMAP4_KBD_WAKEUPENABLE		0x20
+#define OMAP4_KBD_PENDING		0x24
+#define OMAP4_KBD_CTRL			0x28
+#define OMAP4_KBD_DEBOUNCINGTIME	0x2C
+#define OMAP4_KBD_LONGKEYTIME		0x30
+#define OMAP4_KBD_TIMEOUT		0x34
+#define OMAP4_KBD_STATEMACHINE		0x38
+#define OMAP4_KBD_ROWINPUTS		0x3C
+#define OMAP4_KBD_COLUMNOUTPUTS		0x40
+#define OMAP4_KBD_FULLCODE31_0		0x44
+#define OMAP4_KBD_FULLCODE63_32		0x48
+
+/* OMAP4 bit definitions */
+#define OMAP4_DEF_SYSCONFIG_SOFTRST	(1 << 1)
+#define OMAP4_DEF_SYSCONFIG_ENAWKUP	(1 << 2)
+#define OMAP4_DEF_IRQENABLE_EVENTEN	(1 << 0)
+#define OMAP4_DEF_IRQENABLE_LONGKEY	(1 << 1)
+#define OMAP4_DEF_IRQENABLE_TIMEOUTEN	(1 << 2)
+#define OMAP4_DEF_CTRL_NOSOFTMODE	(1 << 1)
+#define OMAP4_DEF_CTRLPTVVALUE		(1 << 2)
+#define OMAP4_DEF_CTRLPTV		(1 << 1)
+#define OMAP4_DEF_IRQDISABLE		0x00
+
+/* OMAP4 values */
+#define OMAP4_VAL_DEBOUNCINGTIME	0x07
+#define OMAP4_VAL_FUNCTIONALCFG		0x1E
+
+#define OMAP4_MASK_IRQSTATUSDISABLE	0xFFFF
+
+struct omap_keypad {
+	struct input_dev *input;
+	struct platform_device *pdev;
+
+	void __iomem    *base;
+	int irq;
+
+	unsigned short *keycodes;
+	unsigned int rows;
+	unsigned int cols;
+	unsigned int row_shift;
+	unsigned char key_state[8];
+	unsigned short keymap[];
+};
+
+static void __init omap_keypad_config(struct omap_keypad *keypad_data)
+{
+	__raw_writel(OMAP4_DEF_SYSCONFIG_SOFTRST | OMAP4_DEF_SYSCONFIG_ENAWKUP,
+			keypad_data->base + OMAP4_KBD_SYSCONFIG);
+	__raw_writel(OMAP4_VAL_FUNCTIONALCFG,
+			keypad_data->base + OMAP4_KBD_CTRL);
+	__raw_writel(OMAP4_VAL_DEBOUNCINGTIME,
+			keypad_data->base + OMAP4_KBD_DEBOUNCINGTIME);
+	__raw_writel(OMAP4_DEF_IRQDISABLE,
+			keypad_data->base + OMAP4_KBD_IRQSTATUS);
+	__raw_writel(OMAP4_DEF_IRQENABLE_EVENTEN | OMAP4_DEF_IRQENABLE_LONGKEY,
+			keypad_data->base + OMAP4_KBD_IRQENABLE);
+}
+
+/* Interrupt handler */
+static irqreturn_t omap_keypad_interrupt(int irq, void *dev_id)
+{
+	struct omap_keypad *keypad_data = dev_id;
+	struct input_dev *input_dev = keypad_data->input;
+	unsigned char key_state[8];
+	int col, row, code;
+	u32 *new_state = (u32 *) key_state;
+
+	/* Disable interrupts */
+	__raw_writel(OMAP4_DEF_IRQDISABLE, keypad_data->base +
+			OMAP4_KBD_IRQENABLE);
+
+	*new_state = __raw_readl(keypad_data->base +
+			OMAP4_KBD_FULLCODE31_0);
+	*(new_state + 1) = __raw_readl(keypad_data->base +
+			OMAP4_KBD_FULLCODE63_32);
+
+	for (col = 0; col < keypad_data->cols; col++) {
+		for (row = 0; row < keypad_data->rows; row++) {
+			code = MATRIX_SCAN_CODE(row, col,
+					keypad_data->row_shift);
+			input_event(input_dev, EV_MSC, MSC_SCAN, code);
+			input_report_key(input_dev, keypad_data->keymap[code],
+					key_state[row] & (1 << col));
+			input_sync(input_dev);
+		}
+	}
+
+	memcpy(keypad_data->key_state, &key_state,
+			sizeof(keypad_data->key_state));
+
+	/* clear pending interrupts */
+	__raw_writel(__raw_readl(keypad_data->base + OMAP4_KBD_IRQSTATUS),
+			keypad_data->base + OMAP4_KBD_IRQSTATUS);
+
+	/* enable interrupts */
+	__raw_writel(OMAP4_DEF_IRQENABLE_EVENTEN | OMAP4_DEF_IRQENABLE_LONGKEY,
+			keypad_data->base + OMAP4_KBD_IRQENABLE);
+
+	return IRQ_HANDLED;
+
+}
+
+
+static int __devinit omap_keypad_probe(struct platform_device *pdev)
+{
+	struct matrix_keypad_platform_data *pdata;
+	struct input_dev *input_dev;
+	const struct matrix_keymap_data *keymap_data;
+	struct omap_keypad *keypad_data;
+
+	unsigned int status = 0, row_shift = 0, error = 0;
+
+	/* platform data */
+	pdata = pdev->dev.platform_data;
+	if (!pdata) {
+		dev_err(&pdev->dev, "no platform data defined\n");
+		return -EINVAL;
+	}
+
+	/* keymap data */
+	keymap_data = pdata->keymap_data;
+	if (!keymap_data) {
+		dev_err(&pdev->dev, "no keymap data defined\n");
+		error = -EINVAL;
+		goto failed_free_pdata;
+	}
+
+	/* omap keypad data and keycodes */
+	row_shift = get_count_order(pdata->num_col_gpios);
+	keypad_data = kzalloc(sizeof(struct omap_keypad) +
+			(pdata->num_row_gpios << row_shift) *
+			sizeof(unsigned short), GFP_KERNEL);
+	if (!keypad_data) {
+		dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
+		error = -ENOMEM;
+		goto failed_free_keymap;
+	}
+
+	memcpy(keypad_data->keymap, pdata->keymap_data->keymap,
+			sizeof(pdata->keymap_data->keymap_size));
+
+	/* omap keyboard base resource */
+	keypad_data->base = pdata->base;
+	if (!keypad_data->base) {
+		error = -ENOMEM;
+		goto failed_free_keypad;
+	}
+
+	/* omap keyboard irq */
+	keypad_data->irq = pdata->irq;
+	if (keypad_data->irq < 0) {
+		dev_err(&pdev->dev, "no keyboard irq assigned\n");
+		error = keypad_data->irq;
+		goto failed_free_base;
+	}
+
+	/* input device allocation */
+	input_dev = input_allocate_device();
+	if (!input_dev) {
+		error = -ENOMEM;
+		goto failed_free_base;
+	}
+
+	keypad_data->input = input_dev;
+	keypad_data->row_shift = row_shift;
+	keypad_data->rows = pdata->num_row_gpios;
+	keypad_data->cols = pdata->num_col_gpios;
+
+	input_dev->name = pdev->name;
+	input_dev->dev.parent = &pdev->dev;
+	input_dev->id.bustype = BUS_HOST;
+	input_dev->id.vendor = 0x0001;
+	input_dev->id.product = 0x0001;
+	input_dev->id.version = 0x0001;
+	input_dev->keycode	= keypad_data->keymap;
+	input_dev->keycodesize	= sizeof(keypad_data->keymap[0]);
+	input_dev->keycodemax	= pdata->num_row_gpios << row_shift;
+
+	__set_bit(EV_KEY, input_dev->evbit);
+	__set_bit(EV_REP, input_dev->evbit);
+
+	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
+	input_set_drvdata(input_dev, keypad_data);
+
+	matrix_keypad_build_keymap(keymap_data, row_shift,
+			input_dev->keycode, input_dev->keybit);
+
+	status = input_register_device(keypad_data->input);
+	if (status < 0) {
+		dev_err(&pdev->dev, "failed to register input device\n");
+		goto failed_free_input;
+	}
+
+	omap_keypad_config(keypad_data);
+
+	status = request_irq(keypad_data->irq, omap_keypad_interrupt,
+			IRQF_TRIGGER_FALLING,
+			"omap4-keypad", keypad_data);
+	if (status) {
+		dev_err(&pdev->dev, "failed to register interrupt\n");
+		error = -ENOMEM;
+		goto failed_unregister_device;
+	}
+
+	platform_set_drvdata(pdev, keypad_data);
+
+	return 0;
+
+failed_unregister_device:
+	input_unregister_device(keypad_data->input);
+	input_dev = NULL;
+failed_free_input:
+	input_free_device(input_dev);
+failed_free_base:
+	keypad_data->base = NULL;
+failed_free_keypad:
+	kfree(keypad_data);
+failed_free_keymap:
+	kfree(keymap_data);
+failed_free_pdata:
+	kfree(pdata);
+	return error;
+}
+
+static int __devexit omap_keypad_remove(struct platform_device *pdev)
+{
+	struct omap_keypad *keypad_data = platform_get_drvdata(pdev);
+
+	free_irq(keypad_data->irq, keypad_data);
+	input_unregister_device(keypad_data->input);
+	keypad_data->input = NULL;
+	platform_set_drvdata(pdev, NULL);
+	kfree(keypad_data);
+
+	return 0;
+}
+
+static struct platform_driver omap_keypad_driver = {
+	.probe		= omap_keypad_probe,
+	.remove		= __devexit_p(omap_keypad_remove),
+	.driver		= {
+		.name	= "omap4-keypad",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init omap_keypad_init(void)
+{
+	return platform_driver_register(&omap_keypad_driver);
+}
+
+static void __exit omap_keypad_exit(void)
+{
+	platform_driver_unregister(&omap_keypad_driver);
+}
+
+module_init(omap_keypad_init);
+module_exit(omap_keypad_exit);
+
+MODULE_AUTHOR("Texas Instruments");
+MODULE_DESCRIPTION("OMAP4 Keypad Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:omap4-keypad");