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yaml
---
r: 58488
b: refs/heads/master
c: 5f56550
h: refs/heads/master
v: v3
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Hans-Christian Egtvedt authored and Dmitry Torokhov committed Jul 10, 2007
1 parent 1bc0511 commit 7bddc8e
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Showing 5 changed files with 275 additions and 1 deletion.
2 changes: 1 addition & 1 deletion [refs]
Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: 9657d75c5f0f7d0a9cb507521d3ad1436aea28c9
refs/heads/master: 5f5655023f2814969b744c1e07494666587243aa
16 changes: 16 additions & 0 deletions trunk/drivers/input/mouse/Kconfig
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Expand Up @@ -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
1 change: 1 addition & 0 deletions trunk/drivers/input/mouse/Makefile
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Expand Up @@ -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

Expand Down
196 changes: 196 additions & 0 deletions trunk/drivers/input/mouse/gpio_mouse.c
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/*
* 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");
61 changes: 61 additions & 0 deletions trunk/include/linux/gpio_mouse.h
Original file line number Diff line number Diff line change
@@ -0,0 +1,61 @@
/*
* 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.
*/

#ifndef _GPIO_MOUSE_H
#define _GPIO_MOUSE_H

#define GPIO_MOUSE_POLARITY_ACT_HIGH 0x00
#define GPIO_MOUSE_POLARITY_ACT_LOW 0x01

#define GPIO_MOUSE_PIN_UP 0
#define GPIO_MOUSE_PIN_DOWN 1
#define GPIO_MOUSE_PIN_LEFT 2
#define GPIO_MOUSE_PIN_RIGHT 3
#define GPIO_MOUSE_PIN_BLEFT 4
#define GPIO_MOUSE_PIN_BMIDDLE 5
#define GPIO_MOUSE_PIN_BRIGHT 6
#define GPIO_MOUSE_PIN_MAX 7

/**
* struct gpio_mouse_platform_data
* @scan_ms: integer in ms specifying the scan periode.
* @polarity: Pin polarity, active high or low.
* @up: GPIO line for up value.
* @down: GPIO line for down value.
* @left: GPIO line for left value.
* @right: GPIO line for right value.
* @bleft: GPIO line for left button.
* @bmiddle: GPIO line for middle button.
* @bright: GPIO line for right button.
*
* This struct must be added to the platform_device in the board code.
* It is used by the gpio_mouse driver to setup GPIO lines and to
* calculate mouse movement.
*/
struct gpio_mouse_platform_data {
int scan_ms;
int polarity;

union {
struct {
int up;
int down;
int left;
int right;

int bleft;
int bmiddle;
int bright;
};
int pins[GPIO_MOUSE_PIN_MAX];
};
};

#endif /* _GPIO_MOUSE_H */

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