| /* |
| * 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/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/input-polldev.h> |
| #include <linux/gpio.h> |
| #include <linux/gpio_mouse.h> |
| |
| |
| /* |
| * Timer function which is run every scan_ms ms when the device is opened. |
| * The dev input variable 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 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); |
| |
| out_free_gpios: |
| while (--i >= 0) { |
| pin = pdata->pins[i]; |
| if (pin) |
| gpio_free(pin); |
| } |
| out: |
| return error; |
| } |
| |
| static int 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); |
| } |
| |
| return 0; |
| } |
| |
| static struct platform_driver gpio_mouse_device_driver = { |
| .probe = gpio_mouse_probe, |
| .remove = gpio_mouse_remove, |
| .driver = { |
| .name = "gpio_mouse", |
| .owner = THIS_MODULE, |
| } |
| }; |
| module_platform_driver(gpio_mouse_device_driver); |
| |
| MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>"); |
| MODULE_DESCRIPTION("GPIO mouse driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform:gpio_mouse"); /* work with hotplug and coldplug */ |
| |