From: Hans-Christian Egtvedt <[EMAIL PROTECTED]>
This patch adds support for simulating a mouse using GPIO lines.
The driver needs a platform_data struct to be defined and registered with the
appropriate platform_device.
The driver has been tested on AT32AP7000 microprocessor using the ATSTK1000
development board.
Signed-off-by: Hans-Christian Egtvedt <[EMAIL PROTECTED]>
---
drivers/input/mouse/Kconfig | 15 ++
drivers/input/mouse/Makefile | 1 +
drivers/input/mouse/gpio_mouse.c | 276 ++++++++++++++++++++++++++++++++++++++
include/linux/gpio_mouse.h | 53 +++++++
4 files changed, 345 insertions(+), 0 deletions(-)
diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
index 35d998c..a3c7057 100644
--- a/drivers/input/mouse/Kconfig
+++ b/drivers/input/mouse/Kconfig
@@ -125,4 +125,19 @@ config MOUSE_HIL
help
Say Y here to support HIL pointers.
+config MOUSE_GPIO
+ tristate "GPIO mouse"
+ depends on GENERIC_GPIO
+ 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 21a1de6..5d0fc43 100644
--- a/drivers/input/mouse/Makefile
+++ b/drivers/input/mouse/Makefile
@@ -13,5 +13,6 @@ 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 alps.o logips2pp.o synaptics.o lifebook.o
trackpoint.o
diff --git a/drivers/input/mouse/gpio_mouse.c b/drivers/input/mouse/gpio_mouse.c
new file mode 100644
index 0000000..3f36b73
--- /dev/null
+++ b/drivers/input/mouse/gpio_mouse.c
@@ -0,0 +1,276 @@
+/*
+ * 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.
+ */
+
+/*#define DEBUG*/
+
+#include <linux/init.h>
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+#include <linux/platform_device.h>
+#include <linux/input.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(unsigned long _dev)
+{
+ struct input_dev *input = (struct input_dev *)_dev;
+ struct gpio_mouse_platform_data *gpio = input->private;
+ 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);
+
+ mod_timer(&gpio->timer, jiffies + msecs_to_jiffies(gpio->scan_ms));
+}
+
+/* Only start the timer when the device is actually in use, i.e. opened */
+static int gpio_mouse_open(struct input_dev *input)
+{
+ struct gpio_mouse_platform_data *gpio = input->private;
+ gpio->timer.expires = jiffies + msecs_to_jiffies(gpio->scan_ms);
+ gpio->timer.data = (unsigned long)input;
+ add_timer(&gpio->timer);
+ return 0;
+}
+
+static void gpio_mouse_close(struct input_dev *input)
+{
+ struct gpio_mouse_platform_data *gpio = input->private;
+ del_timer_sync(&gpio->timer);
+}
+
+static int __init gpio_mouse_probe(struct platform_device *pdev)
+{
+ struct gpio_mouse_platform_data *pdata = pdev->dev.platform_data;
+ struct input_dev *input;
+ int ret;
+
+ if (!pdata) {
+ dev_dbg(&pdev->dev, "no platform data\n");
+ ret = -ENXIO;
+ goto out;
+ }
+
+ if (pdata->up < 0 || pdata->down < 0 || pdata->right < 0
+ || pdata->left < 0) {
+ dev_dbg(&pdev->dev, "missing GPIO for directions\n");
+ ret = -EINVAL;
+ goto out_gpio;
+ }
+ if (pdata->scan_ms < 0) {
+ dev_dbg(&pdev->dev, "invalid scan time\n");
+ ret = -EINVAL;
+ goto out_gpio;
+ }
+
+ /* Mouse direction, required */
+ ret = gpio_request(pdata->up, "gpio_mouse_up");
+ if (ret) {
+ dev_dbg(&pdev->dev, "fail up pin\n");
+ goto out_gpio;
+ }
+ ret = gpio_request(pdata->down, "gpio_mouse_down");
+ if (ret) {
+ dev_dbg(&pdev->dev, "fail down pin\n");
+ goto out_gpio;
+ }
+ ret = gpio_request(pdata->left, "gpio_mouse_left");
+ if (ret) {
+ dev_dbg(&pdev->dev, "fail left pin\n");
+ goto out_gpio;
+ }
+ ret = gpio_request(pdata->right, "gpio_mouse_right");
+ if (ret) {
+ dev_dbg(&pdev->dev, "fail right pin\n");
+ goto out_gpio;
+ }
+
+ gpio_direction_input(pdata->up);
+ gpio_direction_input(pdata->down);
+ gpio_direction_input(pdata->left);
+ gpio_direction_input(pdata->right);
+
+ /* Mouse buttons, not required, but should at least have bleft */
+ if (pdata->bleft >= 0) {
+ ret = gpio_request(pdata->bleft, "gpio_mouse_bleft");
+ if (ret) {
+ dev_dbg(&pdev->dev, "fail bleft pin\n");
+ goto out_gpio;
+ }
+ gpio_direction_input(pdata->bleft);
+ } else {
+ dev_dbg(&pdev->dev, "no left button defined\n");
+ }
+ if (pdata->bmiddle >= 0) {
+ ret = gpio_request(pdata->bmiddle, "gpio_mouse_bmiddle");
+ if (ret) {
+ dev_dbg(&pdev->dev, "fail bmiddle pin\n");
+ goto out_gpio;
+ }
+ gpio_direction_input(pdata->bmiddle);
+ }
+ if (pdata->bright >= 0) {
+ ret = gpio_request(pdata->bright, "gpio_mouse_bright");
+ if (ret) {
+ dev_dbg(&pdev->dev, "fail bright pin\n");
+ goto out_gpio;
+ }
+ gpio_direction_input(pdata->bright);
+ }
+
+ input = input_allocate_device();
+ if (!input) {
+ dev_dbg(&pdev->dev, "not enough memory for input device\n");
+ ret = -ENOMEM;
+ goto out_gpio;
+ }
+
+ platform_set_drvdata(pdev, input);
+
+ input->name = pdev->name;
+ input->cdev.dev = &pdev->dev;
+ input->private = pdata;
+
+ /*
+ * Revisit: is bustype, vendor, product and version needed to
+ * input->id? And if they should be present, what values should they
+ * have?
+ */
+
+ input->evbit[0] = BIT(EV_REL);
+ if (pdata->bleft >= 0 || pdata->bmiddle >= 0 || pdata->bright >= 0) {
+ input->evbit[0] |= BIT(EV_KEY);
+
+ if (pdata->bleft >= 0)
+ input->keybit[LONG(BTN_MOUSE)] = BIT(BTN_LEFT);
+ if (pdata->bmiddle >= 0)
+ input->keybit[LONG(BTN_MOUSE)] |= BIT(BTN_MIDDLE);
+ if (pdata->bright >= 0)
+ input->keybit[LONG(BTN_MOUSE)] |= BIT(BTN_RIGHT);
+ }
+ input->relbit[0] = BIT(REL_X) | BIT(REL_Y);
+
+ input->open = gpio_mouse_open;
+ input->close = gpio_mouse_close;
+
+ /* init the scan timer */
+ pdata->timer.function = gpio_mouse_scan;
+ pdata->timer.base = &boot_tvec_bases;
+
+ ret = input_register_device(input);
+ if (ret) {
+ dev_dbg(&pdev->dev, "could not register input device\n");
+ goto out_reg_dev;
+ }
+
+ 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_reg_dev:
+ input_free_device(input);
+ platform_set_drvdata(pdev, NULL);
+out_gpio:
+ if (pdata->up >= 0)
+ gpio_free(pdata->up);
+ if (pdata->down >= 0)
+ gpio_free(pdata->down);
+ if (pdata->left >= 0)
+ gpio_free(pdata->left);
+ if (pdata->right >= 0)
+ gpio_free(pdata->right);
+ if (pdata->bleft >= 0)
+ gpio_free(pdata->bleft);
+ if (pdata->bmiddle >= 0)
+ gpio_free(pdata->bmiddle);
+ if (pdata->bright >= 0)
+ gpio_free(pdata->bright);
+out:
+ return ret;
+}
+
+static int __exit gpio_mouse_remove(struct platform_device *pdev)
+{
+ struct gpio_mouse_platform_data *pdata = pdev->dev.platform_data;
+ struct input_dev *input = platform_get_drvdata(pdev);
+
+ if (input)
+ input_unregister_device(input);
+
+ if (pdata->up >= 0)
+ gpio_free(pdata->up);
+ if (pdata->down >= 0)
+ gpio_free(pdata->down);
+ if (pdata->left >= 0)
+ gpio_free(pdata->left);
+ if (pdata->right >= 0)
+ gpio_free(pdata->right);
+ if (pdata->bleft >= 0)
+ gpio_free(pdata->bleft);
+ if (pdata->bmiddle >= 0)
+ gpio_free(pdata->bmiddle);
+ if (pdata->bright >= 0)
+ gpio_free(pdata->bright);
+
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+struct platform_driver gpio_mouse_device_driver = {
+ .remove = __exit_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 <[EMAIL PROTECTED]>");
+MODULE_DESCRIPTION("GPIO mouse driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/gpio_mouse.h b/include/linux/gpio_mouse.h
new file mode 100644
index 0000000..b63d43f
--- /dev/null
+++ b/include/linux/gpio_mouse.h
@@ -0,0 +1,53 @@
+/*
+ * 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
+
+#include <linux/timer.h>
+
+#define GPIO_MOUSE_POLARITY_ACT_HIGH 0x00
+#define GPIO_MOUSE_POLARITY_ACT_LOW 0x01
+
+/**
+ * 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.
+ * @bright: GPIO line for right button.
+ * @bmiddle: GPIO line for middle button.
+ * @timer: placeholder for struct timer_list initialized in the driver.
+ *
+ * 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, calculate mouse movement
+ * and have a reference to the timer used for scanning.
+ */
+struct gpio_mouse_platform_data {
+ int scan_ms;
+ int polarity;
+
+ int up;
+ int down;
+ int left;
+ int right;
+
+ int bleft;
+ int bmiddle;
+ int bright;
+
+ /* private */
+ struct timer_list timer;
+};
+
+#endif /* _GPIO_MOUSE_H */
--
1.4.4.2
