5 files changed, 243 insertions, 0 deletions

diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
index 50e06e8dd05d..7bbea097cda2 100644
--- a/drivers/input/mouse/Kconfig
+++ b/drivers/input/mouse/Kconfig
@@ -216,4 +216,20 @@ config MOUSE_HIL
 	help
 	  Say Y here to support HIL pointers.
 
+config MOUSE_GPIO
+	tristate "GPIO mouse"
+	depends on GENERIC_GPIO
+	select INPUT_POLLDEV
+	help
+	  This driver simulates a mouse on GPIO lines of various CPUs (and some
+	  other chips).
+
+	  Say Y here if your device has buttons or a simple joystick connected
+	  directly to GPIO lines. Your board-specific setup logic must also
+	  provide a platform device and platform data saying which GPIOs are
+	  used.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called gpio_mouse.
+
 endif
diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
index aa4ba878533f..9e6e36330820 100644
--- a/drivers/input/mouse/Makefile
+++ b/drivers/input/mouse/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_MOUSE_PS2)		+= psmouse.o
 obj-$(CONFIG_MOUSE_SERIAL)	+= sermouse.o
 obj-$(CONFIG_MOUSE_HIL)		+= hil_ptr.o
 obj-$(CONFIG_MOUSE_VSXXXAA)	+= vsxxxaa.o
+obj-$(CONFIG_MOUSE_GPIO)	+= gpio_mouse.o
 
 psmouse-objs := psmouse-base.o synaptics.o
 
diff --git a/drivers/input/mouse/gpio_mouse.c b/drivers/input/mouse/gpio_mouse.c
new file mode 100644
index 000000000000..0936d6ba015c
--- /dev/null
+++ b/drivers/input/mouse/gpio_mouse.c
@@ -0,0 +1,196 @@
+/*
+ * Driver for simulating a mouse on GPIO lines.
+ *
+ * Copyright (C) 2007 Atmel Corporation
+ *
+ * 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/init.h>
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/input-polldev.h>
+#include <linux/gpio_mouse.h>
+
+#include <asm/gpio.h>
+
+/*
+ * Timer function which is run every scan_ms ms when the device is opened.
+ * The dev input varaible is set to the the input_dev pointer.
+ */
+static void gpio_mouse_scan(struct input_polled_dev *dev)
+{
+	struct gpio_mouse_platform_data *gpio = dev->private;
+	struct input_dev *input = dev->input;
+	int x, y;
+
+	if (gpio->bleft >= 0)
+		input_report_key(input, BTN_LEFT,
+				gpio_get_value(gpio->bleft) ^ gpio->polarity);
+	if (gpio->bmiddle >= 0)
+		input_report_key(input, BTN_MIDDLE,
+				gpio_get_value(gpio->bmiddle) ^ gpio->polarity);
+	if (gpio->bright >= 0)
+		input_report_key(input, BTN_RIGHT,
+				gpio_get_value(gpio->bright) ^ gpio->polarity);
+
+	x = (gpio_get_value(gpio->right) ^ gpio->polarity)
+		- (gpio_get_value(gpio->left) ^ gpio->polarity);
+	y = (gpio_get_value(gpio->down) ^ gpio->polarity)
+		- (gpio_get_value(gpio->up) ^ gpio->polarity);
+
+	input_report_rel(input, REL_X, x);
+	input_report_rel(input, REL_Y, y);
+	input_sync(input);
+}
+
+static int __init gpio_mouse_probe(struct platform_device *pdev)
+{
+	struct gpio_mouse_platform_data *pdata = pdev->dev.platform_data;
+	struct input_polled_dev *input_poll;
+	struct input_dev *input;
+	int pin, i;
+	int error;
+
+	if (!pdata) {
+		dev_err(&pdev->dev, "no platform data\n");
+		error = -ENXIO;
+		goto out;
+	}
+
+	if (pdata->scan_ms < 0) {
+		dev_err(&pdev->dev, "invalid scan time\n");
+		error = -EINVAL;
+		goto out;
+	}
+
+	for (i = 0; i < GPIO_MOUSE_PIN_MAX; i++) {
+		pin = pdata->pins[i];
+
+		if (pin < 0) {
+
+			if (i <= GPIO_MOUSE_PIN_RIGHT) {
+				/* Mouse direction is required. */
+				dev_err(&pdev->dev,
+					"missing GPIO for directions\n");
+				error = -EINVAL;
+				goto out_free_gpios;
+			}
+
+			if (i == GPIO_MOUSE_PIN_BLEFT)
+				dev_dbg(&pdev->dev, "no left button defined\n");
+
+		} else {
+			error = gpio_request(pin, "gpio_mouse");
+			if (error) {
+				dev_err(&pdev->dev, "fail %d pin (%d idx)\n",
+					pin, i);
+				goto out_free_gpios;
+			}
+
+			gpio_direction_input(pin);
+		}
+	}
+
+	input_poll = input_allocate_polled_device();
+	if (!input_poll) {
+		dev_err(&pdev->dev, "not enough memory for input device\n");
+		error = -ENOMEM;
+		goto out_free_gpios;
+	}
+
+	platform_set_drvdata(pdev, input_poll);
+
+	/* set input-polldev handlers */
+	input_poll->private = pdata;
+	input_poll->poll = gpio_mouse_scan;
+	input_poll->poll_interval = pdata->scan_ms;
+
+	input = input_poll->input;
+	input->name = pdev->name;
+	input->id.bustype = BUS_HOST;
+	input->dev.parent = &pdev->dev;
+
+	input_set_capability(input, EV_REL, REL_X);
+	input_set_capability(input, EV_REL, REL_Y);
+	if (pdata->bleft >= 0)
+		input_set_capability(input, EV_KEY, BTN_LEFT);
+	if (pdata->bmiddle >= 0)
+		input_set_capability(input, EV_KEY, BTN_MIDDLE);
+	if (pdata->bright >= 0)
+		input_set_capability(input, EV_KEY, BTN_RIGHT);
+
+	error = input_register_polled_device(input_poll);
+	if (error) {
+		dev_err(&pdev->dev, "could not register input device\n");
+		goto out_free_polldev;
+	}
+
+	dev_dbg(&pdev->dev, "%d ms scan time, buttons: %s%s%s\n",
+			pdata->scan_ms,
+			pdata->bleft < 0 ? "" : "left ",
+			pdata->bmiddle < 0 ? "" : "middle ",
+			pdata->bright < 0 ? "" : "right");
+
+	return 0;
+
+ out_free_polldev:
+	input_free_polled_device(input_poll);
+	platform_set_drvdata(pdev, NULL);
+
+ out_free_gpios:
+	while (--i >= 0) {
+		pin = pdata->pins[i];
+		if (pin)
+			gpio_free(pin);
+	}
+ out:
+	return error;
+}
+
+static int __devexit gpio_mouse_remove(struct platform_device *pdev)
+{
+	struct input_polled_dev *input = platform_get_drvdata(pdev);
+	struct gpio_mouse_platform_data *pdata = input->private;
+	int pin, i;
+
+	input_unregister_polled_device(input);
+	input_free_polled_device(input);
+
+	for (i = 0; i < GPIO_MOUSE_PIN_MAX; i++) {
+		pin = pdata->pins[i];
+		if (pin >= 0)
+			gpio_free(pin);
+	}
+
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+struct platform_driver gpio_mouse_device_driver = {
+	.remove		= __devexit_p(gpio_mouse_remove),
+	.driver		= {
+		.name	= "gpio_mouse",
+	}
+};
+
+static int __init gpio_mouse_init(void)
+{
+	return platform_driver_probe(&gpio_mouse_device_driver,
+			gpio_mouse_probe);
+}
+module_init(gpio_mouse_init);
+
+static void __exit gpio_mouse_exit(void)
+{
+	platform_driver_unregister(&gpio_mouse_device_driver);
+}
+module_exit(gpio_mouse_exit);
+
+MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>");
+MODULE_DESCRIPTION("GPIO mouse driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
index f15f695777f8..b9f0fb2530e2 100644
--- a/drivers/input/mouse/psmouse-base.c
+++ b/drivers/input/mouse/psmouse-base.c
@@ -178,6 +178,15 @@ static psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
 	}
 
 /*
+ * Cortron PS2 Trackball reports SIDE button on the 4th bit of the first
+ * byte.
+ */
+	if (psmouse->type == PSMOUSE_CORTRON) {
+		input_report_key(dev, BTN_SIDE, (packet[0] >> 3) & 1);
+		packet[0] |= 0x08;
+	}
+
+/*
  * Generic PS/2 Mouse
  */
 
@@ -539,6 +548,20 @@ static int ps2bare_detect(struct psmouse *psmouse, int set_properties)
 	return 0;
 }
 
+/*
+ * Cortron PS/2 protocol detection. There's no special way to detect it, so it
+ * must be forced by sysfs protocol writing.
+ */
+static int cortron_detect(struct psmouse *psmouse, int set_properties)
+{
+	if (set_properties) {
+		psmouse->vendor = "Cortron";
+		psmouse->name = "PS/2 Trackball";
+		set_bit(BTN_SIDE, psmouse->dev->keybit);
+	}
+
+	return 0;
+}
 
 /*
  * psmouse_extensions() probes for any extensions to the basic PS/2 protocol
@@ -740,6 +763,12 @@ static const struct psmouse_protocol psmouse_protocols[] = {
 	},
 #endif
 	{
+		.type		= PSMOUSE_CORTRON,
+		.name		= "CortronPS/2",
+		.alias		= "cortps",
+		.detect		= cortron_detect,
+	},
+	{
 		.type		= PSMOUSE_AUTO,
 		.name		= "auto",
 		.alias		= "any",
diff --git a/drivers/input/mouse/psmouse.h b/drivers/input/mouse/psmouse.h
index 3964e8acbc54..27a68835b5ba 100644
--- a/drivers/input/mouse/psmouse.h
+++ b/drivers/input/mouse/psmouse.h
@@ -88,6 +88,7 @@ enum psmouse_type {
 	PSMOUSE_LIFEBOOK,
 	PSMOUSE_TRACKPOINT,
 	PSMOUSE_TOUCHKIT_PS2,
+	PSMOUSE_CORTRON,
 	PSMOUSE_AUTO		/* This one should always be last */
 };