[PATCH 1/2] Input: DaVinci Keypad Driver

[miguel.aguilar@ridgerun.com]

From: Miguel Aguilar <miguel.aguilar@ridgerun.com>

Adds the driver for enabling keypad support for DaVinci platforms.

DM365 is the only platform that uses this driver at the moment.

This driver was tested on DM365 EVM rev C.

Signed-off-by: Miguel Aguilar <miguel.aguilar@ridgerun.com>
---
 arch/arm/configs/davinci_all_defconfig      |    1 +
 arch/arm/mach-davinci/include/mach/keypad.h |   35 +++
 drivers/input/keyboard/Kconfig              |    7 +
 drivers/input/keyboard/Makefile             |    1 +
 drivers/input/keyboard/davinci_keypad.c     |  319 +++++++++++++++++++++++++++
 5 files changed, 363 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/mach-davinci/include/mach/keypad.h
 create mode 100644 drivers/input/keyboard/davinci_keypad.c

diff --git a/arch/arm/configs/davinci_all_defconfig b/arch/arm/configs/davinci_all_defconfig
index ec63c15..e994c83 100644
--- a/arch/arm/configs/davinci_all_defconfig
+++ b/arch/arm/configs/davinci_all_defconfig
@@ -763,6 +763,7 @@ CONFIG_KEYBOARD_GPIO=y
 # CONFIG_KEYBOARD_STOWAWAY is not set
 # CONFIG_KEYBOARD_SUNKBD is not set
 CONFIG_KEYBOARD_XTKBD=m
+CONFIG_KEYBOARD_DAVINCI_DM365=m
 # CONFIG_INPUT_MOUSE is not set
 # CONFIG_INPUT_JOYSTICK is not set
 # CONFIG_INPUT_TABLET is not set
diff --git a/arch/arm/mach-davinci/include/mach/keypad.h b/arch/arm/mach-davinci/include/mach/keypad.h
new file mode 100644
index 0000000..922d20e
--- /dev/null
+++ b/arch/arm/mach-davinci/include/mach/keypad.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2009 Texas Instruments, Inc
+ *
+ * Author: Miguel Aguilar <miguel.aguilar@ridgerun.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
+ */
+
+#ifndef DAVINCI_KEYPAD_H
+#define DAVINCI_KEYPAD_H
+
+#include <linux/io.h>
+
+struct davinci_kp_platform_data {
+	int	*keymap;
+	u32	keymapsize;
+	u32	rep:1;
+	u32	strobe;
+	u32	interval;
+};
+
+#endif
+
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index a6b989a..b6b9517 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -361,4 +361,11 @@ config KEYBOARD_XTKBD
 	  To compile this driver as a module, choose M here: the
 	  module will be called xtkbd.
 
+config KEYBOARD_DAVINCI
+	tristate "TI DaVinci Keypad"
+	depends on ARCH_DAVINCI_DM365
+	help
+	  Say Y to enable keypad module support for the TI DaVinci
+	  platforms (DM365)
+
 endif
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index b5b5eae..0b0274e 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -31,3 +31,4 @@ obj-$(CONFIG_KEYBOARD_STOWAWAY)		+= stowaway.o
 obj-$(CONFIG_KEYBOARD_SUNKBD)		+= sunkbd.o
 obj-$(CONFIG_KEYBOARD_TOSA)		+= tosakbd.o
 obj-$(CONFIG_KEYBOARD_XTKBD)		+= xtkbd.o
+obj-$(CONFIG_KEYBOARD_DAVINCI)		+= davinci_keypad.o
diff --git a/drivers/input/keyboard/davinci_keypad.c b/drivers/input/keyboard/davinci_keypad.c
new file mode 100644
index 0000000..6f0e793
--- /dev/null
+++ b/drivers/input/keyboard/davinci_keypad.c
@@ -0,0 +1,319 @@
+/*
+ * DaVinci Keypad Driver for TI platforms
+ *
+ * Copyright (C) 2009 Texas Instruments, Inc
+ *
+ * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
+ *
+ * Intial Code: Sandeep Paulraj <s-paulraj@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/types.h>
+#include <linux/input.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/errno.h>
+
+#include <asm/irq.h>
+
+#include <mach/hardware.h>
+#include <mach/irqs.h>
+#include <mach/keypad.h>
+
+/* Keypad registers */
+#define DAVINCI_KEYPAD_KEYCTRL		0x0000
+#define DAVINCI_KEYPAD_INTENA		0x0004
+#define DAVINCI_KEYPAD_INTFLAG		0x0008
+#define DAVINCI_KEYPAD_INTCLR		0x000c
+#define DAVINCI_KEYPAD_STRBWIDTH	0x0010
+#define DAVINCI_KEYPAD_INTERVAL		0x0014
+#define DAVINCI_KEYPAD_CONTTIME		0x0018
+#define DAVINCI_KEYPAD_CURRENTST	0x001c
+#define DAVINCI_KEYPAD_PREVSTATE	0x0020
+#define DAVINCI_KEYPAD_EMUCTRL		0x0024
+#define DAVINCI_KEYPAD_IODFTCTRL	0x002c
+
+/* Key Control Register (KEYCTRL) */
+#define DAVINCI_KEYPAD_KEYEN		0x00000001
+#define DAVINCI_KEYPAD_PREVMODE		0x00000002
+#define DAVINCI_KEYPAD_CHATOFF		0x00000004
+#define DAVINCI_KEYPAD_AUTODET		0x00000008
+#define DAVINCI_KEYPAD_SCANMODE		0x00000010
+#define DAVINCI_KEYPAD_OUTTYPE		0x00000020
+#define DAVINCI_KEYPAD_4X4		0x00000040
+
+/* Masks for the interrupts */
+#define DAVINCI_KEYPAD_INT_CONT		0x00000008
+#define DAVINCI_KEYPAD_INT_OFF		0x00000004
+#define DAVINCI_KEYPAD_INT_ON		0x00000002
+#define DAVINCI_KEYPAD_INT_CHANGE	0x00000001
+#define DAVINCI_KEYPAD_INT_ALL		0x0000000f
+
+struct davinci_kp {
+	struct input_dev		*input;
+	struct davinci_kp_platform_data	*pdata;
+	int				irq;
+	void __iomem			*base;
+	resource_size_t			pbase;
+	size_t				base_size;
+};
+
+static void davinci_kp_write(struct davinci_kp *davinci_kp, u32 val, u32 addr)
+{
+	u32 base = (u32)davinci_kp->base;
+
+	__raw_writel(val,(u32 *)(base + addr));
+}
+
+static u32 davinci_kp_read(struct davinci_kp *davinci_kp, u32 addr)
+{
+	u32 base = (u32)davinci_kp->base;
+
+	return __raw_readl((u32 *)(base + addr));
+}
+
+/* Initializing the kp Module */
+static void davinci_kp_initialize(struct davinci_kp *davinci_kp)
+{
+	u32 strobe = davinci_kp->pdata->strobe;
+	u32 interval = davinci_kp->pdata->interval;
+
+	/* Enable all interrupts */
+	davinci_kp_write(davinci_kp, DAVINCI_KEYPAD_INT_ALL, DAVINCI_KEYPAD_INTENA);
+
+	/* Clear interrupts if any */
+	davinci_kp_write(davinci_kp, DAVINCI_KEYPAD_INT_ALL, DAVINCI_KEYPAD_INTCLR);
+
+	/* Setup the scan period = strobe + interval */
+	davinci_kp_write(davinci_kp, strobe, DAVINCI_KEYPAD_STRBWIDTH);
+	davinci_kp_write(davinci_kp, interval, DAVINCI_KEYPAD_INTERVAL);
+	davinci_kp_write(davinci_kp, 0x01, DAVINCI_KEYPAD_CONTTIME);
+
+	/* Enable Keyscan module and enable */
+	davinci_kp_write(davinci_kp, DAVINCI_KEYPAD_AUTODET | DAVINCI_KEYPAD_KEYEN,
+			DAVINCI_KEYPAD_KEYCTRL);
+}
+
+static irqreturn_t davinci_kp_interrupt(int irq, void *dev_id)
+{
+	struct davinci_kp *davinci_kp = dev_id;
+	struct device *dev = &davinci_kp->input->dev;
+	int *keymap = davinci_kp->pdata->keymap;
+		u32 prev_status, new_status, changed, position;
+	int keycode = KEY_UNKNOWN;
+	int ret = IRQ_NONE;
+
+	/* Disable interrupt */
+	davinci_kp_write(davinci_kp, 0x0, DAVINCI_KEYPAD_INTENA);
+
+	/* Reading previous and new status of the keypad */
+	prev_status = davinci_kp_read(davinci_kp, DAVINCI_KEYPAD_PREVSTATE);
+	new_status = davinci_kp_read(davinci_kp, DAVINCI_KEYPAD_CURRENTST);
+
+	changed = prev_status ^ new_status;
+	position = ffs(changed) - 1;
+
+	if (changed) {
+		keycode = keymap[position];
+		if((new_status >> position) & 0x1) {
+			/* Report release */
+			dev_dbg(dev, "davinci_keypad: key %d released\n",
+				    keycode);
+			input_report_key(davinci_kp->input, keycode, 0);
+		} else {
+			/* Report press */
+			dev_dbg(dev, "davinci_keypad: key %d pressed\n",
+				    keycode);
+			input_report_key(davinci_kp->input, keycode, 1);
+		}
+		input_sync(davinci_kp->input);
+		ret = IRQ_HANDLED;
+	}
+
+	/* Clearing interrupt */
+	davinci_kp_write(davinci_kp, DAVINCI_KEYPAD_INT_ALL, DAVINCI_KEYPAD_INTCLR);
+
+	/* Enable interrupts */
+	davinci_kp_write(davinci_kp, 0x1, DAVINCI_KEYPAD_INTENA);
+
+	return ret;
+}
+
+static int __init davinci_kp_probe(struct platform_device *pdev)
+{
+	struct davinci_kp *davinci_kp;
+	struct input_dev *key_dev;
+	struct resource *res, *mem;
+	int ret, i;
+	struct device * dev = &pdev->dev;
+	struct davinci_kp_platform_data *pdata = pdev->dev.platform_data;
+
+	dev_info(dev, "DaVinci Keypad Driver\n");
+
+	if (!pdata->keymap) {
+		dev_dbg(dev, "no keymap from pdata\n");
+		return -EINVAL;
+	}
+
+	davinci_kp = kzalloc(sizeof *davinci_kp, GFP_KERNEL);
+	if(!davinci_kp) {
+		dev_dbg(dev, "could not allocate memory for private data\n");
+		return -ENOMEM;
+	}
+
+	key_dev = input_allocate_device();
+	if (!key_dev) {
+		dev_dbg(dev, "could not allocate input device\n");
+		ret = -ENOMEM;
+		goto fail1;
+	}
+
+	platform_set_drvdata(pdev, davinci_kp);
+
+	davinci_kp->input = key_dev;
+
+	davinci_kp->irq = platform_get_irq(pdev, 0);
+	if (davinci_kp->irq < 0) {
+		dev_err(dev, "no keypad irq\n");
+		ret = davinci_kp->irq;
+		goto fail2;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(dev, "no mem resource\n");
+		ret = -ENODEV;
+		goto fail2;
+	}
+
+	davinci_kp->pbase = res->start;
+	davinci_kp->base_size = resource_size(res);
+
+	mem = request_mem_region(davinci_kp->pbase, davinci_kp->base_size, pdev->name);
+	if (!mem) {
+		dev_err(dev, "KEYSCAN registers at %08x are not free\n",
+			davinci_kp->pbase);
+		ret = -EBUSY;
+		goto fail2;
+	}
+
+	davinci_kp->base = ioremap(davinci_kp->pbase, davinci_kp->base_size);
+	if (!davinci_kp->base) {
+		dev_err(dev, "can't ioremap MEM resource.\n");
+		ret = -ENOMEM;
+		goto fail3;
+	}
+
+	/* Enable auto repeat feature of Linux input subsystem */
+	if (pdata->rep)
+		__set_bit(EV_REP, key_dev->evbit);
+
+	/* Setup input device */
+	__set_bit(EV_KEY, key_dev->evbit);
+
+	/* Setup the keymap */
+	davinci_kp->pdata = pdata;
+
+	for (i = 0; i < davinci_kp->pdata->keymapsize; i++)
+		__set_bit(davinci_kp->pdata->keymap[i], key_dev->keybit);
+
+	key_dev->name = "davinci_keypad";
+	key_dev->phys = "davinci_keypad/input0";
+	key_dev->dev.parent = &pdev->dev;
+	key_dev->id.bustype = BUS_HOST;
+	key_dev->id.vendor = 0x0001;
+	key_dev->id.product = 0x0001;
+	key_dev->id.version = 0x0001;
+	key_dev->keycode = davinci_kp->pdata->keymap;
+	key_dev->keycodesize = sizeof(unsigned int);
+	key_dev->keycodemax = davinci_kp->pdata->keymapsize;
+
+	ret = input_register_device(davinci_kp->input);
+	if (ret < 0) {
+		dev_err(dev, "unable to register DaVinci keypad device\n");
+		goto fail4;
+	}
+
+	ret = request_irq(davinci_kp->irq, davinci_kp_interrupt, IRQF_DISABLED,
+                         "davinci_keypad", davinci_kp);
+	if (ret < 0) {
+		dev_err(dev, "unable to register DaVinci keypad Interrupt\n");
+		goto fail5;
+	}
+
+	davinci_kp_initialize(davinci_kp);
+
+	return 0;
+fail5:
+	input_unregister_device(davinci_kp->input);
+	key_dev = NULL;
+fail4:
+	iounmap(davinci_kp->base);
+fail3:
+	release_mem_region(davinci_kp->pbase, davinci_kp->base_size);
+fail2:
+	input_free_device(key_dev);
+fail1:
+	kfree(davinci_kp);
+
+	return ret;
+}
+
+static int __exit davinci_kp_remove(struct platform_device *pdev)
+{
+	struct davinci_kp *davinci_kp = platform_get_drvdata(pdev);
+
+	free_irq(davinci_kp->irq, davinci_kp);
+
+	input_unregister_device(davinci_kp->input);
+
+	iounmap(davinci_kp->base);
+	release_mem_region(davinci_kp->pbase, davinci_kp->base_size);
+
+	platform_set_drvdata(pdev, NULL);
+
+	kfree(davinci_kp);
+
+	return 0;
+}
+
+static struct platform_driver davinci_kp_driver = {
+	.driver = {
+			.name = "davinci_keypad",
+			.owner = THIS_MODULE,
+		},
+	.remove = __exit_p(davinci_kp_remove),
+};
+
+static int __init davinci_kp_init(void)
+{
+	return platform_driver_probe(&davinci_kp_driver, davinci_kp_probe);
+}
+module_init(davinci_kp_init);
+
+static void __exit davinci_kp_exit(void)
+{
+	platform_driver_unregister(&davinci_kp_driver);
+}
+module_exit(davinci_kp_exit);
+
+MODULE_AUTHOR("Miguel Aguilar");
+MODULE_DESCRIPTION("Texas Instruments DaVinci Keypad Driver");
+MODULE_LICENSE("GPL");
-- 
1.6.0.4