Input: add gpio-mouse driver (5f565502) · Commits · e / devices / android_kernel_sony_msm8998

drivers/input/mouse/Kconfig

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		@@ -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

drivers/input/mouse/Makefile

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		@@ -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

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");

include/linux/gpio_mouse.h

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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.
		*/

		#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 */