Add AR1010 serial touch screen, enable it in s_defconfig

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>

4 files changed, 262 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index c16429fc71a6..f965c4f7f9ac 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -827,4 +827,13 @@ config TOUCHSCREEN_AR1020_I2C
 	  To compile this driver as a module, choose M here: the
 	  module will be called ar1020-i2c.
 
+config TOUCHSCREEN_AR1010_UART
+	tristate "Microchip AR1010 UART touchscreen"
+	help
+	  Say Y here if you have a Microchip AR1010 serial touch controller 
+	  and want to enable support for it
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called mchpar1xxx.
+
 endif
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 846f5a1b4ee8..60be897e4438 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -69,3 +69,4 @@ obj-$(CONFIG_TOUCHSCREEN_EGALAX)	+= egalax_ts.o
 obj-$(CONFIG_TOUCHSCREEN_FT5X06)	+= ft5x06_ts.o
 obj-$(CONFIG_TOUCHSCREEN_ELAN)		+= elan_ts.o
 obj-$(CONFIG_TOUCHSCREEN_AR1020_I2C)	+= ar1020-i2c.o
+obj-$(CONFIG_TOUCHSCREEN_AR1010_UART)	+= mchpar1xxx.o
diff --git a/drivers/input/touchscreen/mchpar1xxx.c b/drivers/input/touchscreen/mchpar1xxx.c
new file mode 100755
index 000000000000..379747eb5671
--- /dev/null
+++ b/drivers/input/touchscreen/mchpar1xxx.c
@@ -0,0 +1,249 @@
+/*
+ * Microchip Serial Touchscreen Driver
+ *
+ * Copyright (c) 2010 Microchip Technology, Inc.
+ * 
+ * http://www.microchip.com/mtouch
+ */
+
+/*
+ * 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.
+ */
+
+/*
+ * This driver can handle serial Microchip controllers using the AR1XXX 5-byte protocol 
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+#include "serio-mchp.h"
+#include <linux/init.h>
+#include <linux/ctype.h>
+
+#define DRIVER_DESC	"Microchip AR1XXX Serial Touchscreen Driver"
+
+MODULE_AUTHOR("Steve Grahovac <steve.grahovac@microchip.com>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+/*
+ * Definitions & global arrays.
+ */
+
+#define MCHIP_MAX_LENGTH	5
+
+/*
+ * Per-touchscreen controller data.
+ */
+
+struct mchip {
+	struct input_dev *dev;
+	struct serio *serio;
+	int id;
+	int index;
+	unsigned char data[MCHIP_MAX_LENGTH];
+	char phys[32];
+};
+
+static void mchpar1xxx_process_data(struct mchip *mchip, unsigned char data)
+{
+	struct input_dev *dev = mchip->dev;
+
+	mchip->data[mchip->index] = data;
+
+	/****************************************************
+	
+	Data format, 5 bytes: SYNC, DATA1, DATA2, DATA3, DATA4
+	
+	SYNC [7:0]: 1,0,0,0,0,TOUCHSTATUS[0:0]
+	DATA1[7:0]: 0,X-LOW[6:0]
+	DATA2[7:0]: 0,X-HIGH[4:0]
+	DATA3[7:0]: 0,Y-LOW[6:0]
+	DATA4[7:0]: 0,Y-HIGH[4:0]
+	
+	TOUCHSTATUS: 0 = Touch up, 1 = Touch down
+	
+	****************************************************/		
+	
+	switch (mchip->index++) {
+		case 0:
+			if (!(0x80 & data))
+			{
+/*			    printk(KERN_ERR "mchip: Sync bit not set\n"); */
+			    mchip->index = 0;			  
+			}
+			break;
+
+		case (MCHIP_MAX_LENGTH - 1):
+			/* verify byte is valid for current index */
+			if (0x80 & data)
+			{
+				/* byte not valid */			  
+				mchip->data[0]=data;
+				mchip->index = 1;
+				break;
+			}			  
+
+			mchip->index = 0;
+
+/*			printk(KERN_ERR "mchip: %d %d %d\n",((mchip->data[2] & 0x1f) << 7) | (mchip->data[1] & 0x7f), 				((mchip->data[4] & 0x1f) << 7) | (mchip->data[3] & 0x7f), 0 != (mchip->data[0] & 7)); */			
+			
+			input_report_abs(dev, ABS_X, ((mchip->data[2] & 0x1f) << 7) | (mchip->data[1] & 0x7f));
+			input_report_abs(dev, ABS_Y, ((mchip->data[4] & 0x1f) << 7) | (mchip->data[3] & 0x7f));
+			input_report_key(dev, BTN_TOUCH, 0 != (mchip->data[0] & 1) );
+			input_sync(dev);			
+			break;
+		default:
+			/* verify byte is valid for current index */
+			if (0x80 & data)
+			{
+				/* byte not valid */
+				mchip->data[0]=data;
+				mchip->index = 1;
+			}			  
+			break;
+			
+	}
+}
+
+
+static irqreturn_t mchpar1xxx_interrupt(struct serio *serio,
+		unsigned char data, unsigned int flags)
+{
+    struct mchip *mchip = serio_get_drvdata(serio);
+
+    mchpar1xxx_process_data(mchip, data);
+
+    return IRQ_HANDLED;
+}
+
+static int mchpar1xxx_setup(struct mchip *mchip)
+{
+	struct input_dev *dev = mchip->dev;
+
+	input_set_abs_params(dev, ABS_X, 0, 4095, 0, 0);
+	input_set_abs_params(dev, ABS_Y, 0, 4095, 0, 0);
+	return 0;
+}
+
+/*
+ * mchpar1xxx_disconnect() is the opposite of mchpar1xxx_connect()
+ */
+
+static void mchpar1xxx_disconnect(struct serio *serio)
+{
+	struct mchip *mchip = serio_get_drvdata(serio);
+
+	input_get_device(mchip->dev);
+	input_unregister_device(mchip->dev);
+	serio_close(serio);
+	serio_set_drvdata(serio, NULL);
+	input_put_device(mchip->dev);
+	kfree(mchip);
+}
+
+/*
+ * mchpar1xxx_connect() is the routine that is called when someone adds a
+ * new serio device that supports AR1XXX protocol and registers it as
+ * an input device.
+ */
+
+static int mchpar1xxx_connect(struct serio *serio, struct serio_driver *drv)
+{
+	struct mchip *mchip;
+	struct input_dev *input_dev;
+	int err;
+
+	mchip = kzalloc(sizeof(struct mchip), GFP_KERNEL);
+	input_dev = input_allocate_device();
+	if (!mchip || !input_dev) {
+		err = -ENOMEM;
+		goto fail1;
+	}
+
+	mchip->serio = serio;
+	mchip->id = serio->id.id;
+	mchip->dev = input_dev;
+	snprintf(mchip->phys, sizeof(mchip->phys), "%s/input0", serio->phys);
+
+	input_dev->name = "Microchip AR1XXX Serial TouchScreen";
+	input_dev->phys = mchip->phys;
+	input_dev->id.bustype = BUS_RS232;
+	input_dev->id.vendor = SERIO_MCHPAR1XXX;
+	input_dev->id.product = mchip->id;
+	input_dev->id.version = 0x0100;
+	input_dev->dev.parent = &serio->dev;
+
+	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+
+	serio_set_drvdata(serio, mchip);
+
+	err = serio_open(serio, drv);
+	if (err)
+		goto fail2;
+
+	mchpar1xxx_setup(mchip);
+
+	err = input_register_device(mchip->dev);
+	if (err)
+		goto fail3;
+
+	return 0;
+
+ fail3: serio_close(serio);
+ fail2:	serio_set_drvdata(serio, NULL);
+ fail1:	input_free_device(input_dev);
+	kfree(mchip);
+	return err;
+}
+
+/*
+ * The serio driver structure.
+ */
+
+static struct serio_device_id mchpar1xxx_serio_ids[] = {
+	{
+		.type	= SERIO_RS232,
+		.proto	= SERIO_MCHPAR1XXX,
+		.id	= SERIO_ANY,
+		.extra	= SERIO_ANY,
+	},
+	{ 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, mchpar1xxx_serio_ids);
+
+static struct serio_driver mchpar1xxx_drv = {
+	.driver		= {
+		.name	= "mchip",
+	},
+	.description	= DRIVER_DESC,
+	.id_table	= mchpar1xxx_serio_ids,
+	.interrupt	= mchpar1xxx_interrupt,
+	.connect	= mchpar1xxx_connect,
+	.disconnect	= mchpar1xxx_disconnect,
+};
+
+/*
+ * The functions for inserting/removing us as a module.
+ */
+
+static int __init mchpar1xxx_init(void)
+{
+	return serio_register_driver(&mchpar1xxx_drv);
+}
+
+static void __exit mchpar1xxx_exit(void)
+{
+	serio_unregister_driver(&mchpar1xxx_drv);
+}
+
+module_init(mchpar1xxx_init);
+module_exit(mchpar1xxx_exit);
diff --git a/drivers/input/touchscreen/serio-mchp.h b/drivers/input/touchscreen/serio-mchp.h
new file mode 100755
index 000000000000..b0fa8c9735a7
--- /dev/null
+++ b/drivers/input/touchscreen/serio-mchp.h
@@ -0,0 +1,3 @@
+#define SERIO_MCHPTSHARC 0xf0
+#define SERIO_MCHPPCAP   0xf1
+#define SERIO_MCHPAR1XXX 0xf2