Input: gpio_mouse - convert to use GPIO descriptors (836bd419) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/input/mouse/gpio_mouse.c

+67 −124

Original line number	Diff line number	Diff line
		@@ -2,6 +2,7 @@
		* Driver for simulating a mouse on GPIO lines.
		*
		* Copyright (C) 2007 Atmel Corporation
		* Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
		*
		* 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
		@@ -11,24 +12,12 @@
		#include <linux/module.h>
		#include <linux/platform_device.h>
		#include <linux/input-polldev.h>
		#include <linux/gpio.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
		#include <linux/gpio/consumer.h>
		#include <linux/property.h>

		/**
		* struct gpio_mouse
		* @scan_ms: integer in ms specifying the scan periode.
		* @polarity: Pin polarity, active high or low.
		* @scan_ms: the scan interval in milliseconds.
		* @up: GPIO line for up value.
		* @down: GPIO line for down value.
		* @left: GPIO line for left value.
		@@ -36,29 +25,20 @@
		* @bleft: GPIO line for left button.
		* @bmiddle: GPIO line for middle button.
		* @bright: GPIO line for right button.
		* @pins: GPIO line numbers used for the mouse.
		*
		* 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 {
		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];
		};
		u32 scan_ms;
		struct gpio_desc *up;
		struct gpio_desc *down;
		struct gpio_desc *left;
		struct gpio_desc *right;
		struct gpio_desc *bleft;
		struct gpio_desc *bmiddle;
		struct gpio_desc *bright;
		};

		/*
		@@ -71,20 +51,18 @@ static void gpio_mouse_scan(struct input_polled_dev *dev)
		struct input_dev *input = dev->input;
		int x, y;

		if (gpio->bleft >= 0)
		if (gpio->bleft)
		input_report_key(input, BTN_LEFT,
		gpio_get_value(gpio->bleft) ^ gpio->polarity);
		if (gpio->bmiddle >= 0)
		gpiod_get_value(gpio->bleft));
		if (gpio->bmiddle)
		input_report_key(input, BTN_MIDDLE,
		gpio_get_value(gpio->bmiddle) ^ gpio->polarity);
		if (gpio->bright >= 0)
		gpiod_get_value(gpio->bmiddle));
		if (gpio->bright)
		input_report_key(input, BTN_RIGHT,
		gpio_get_value(gpio->bright) ^ gpio->polarity);
		gpiod_get_value(gpio->bright));

		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);
		x = gpiod_get_value(gpio->right) - gpiod_get_value(gpio->left);
		y = gpiod_get_value(gpio->down) - gpiod_get_value(gpio->up);

		input_report_rel(input, REL_X, x);
		input_report_rel(input, REL_Y, y);
		@@ -97,52 +75,49 @@ static int gpio_mouse_probe(struct platform_device *pdev)
		struct gpio_mouse *gmouse;
		struct input_polled_dev *input_poll;
		struct input_dev *input;
		int pin, i;
		int error;
		int ret;

		gmouse = devm_kzalloc(dev, sizeof(*gmouse), GFP_KERNEL);
		if (!gmouse)
		return -ENOMEM;

		if (gmouse->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 = gmouse->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);
		}
		/* Assign some default scanning time */
		ret = device_property_read_u32(dev, "scan-interval-ms",
		&gmouse->scan_ms);
		if (ret \|\| gmouse->scan_ms == 0) {
		dev_warn(dev, "invalid scan time, set to 50 ms\n");
		gmouse->scan_ms = 50;
		}

		input_poll = input_allocate_polled_device();
		gmouse->up = devm_gpiod_get(dev, "up", GPIOD_IN);
		if (IS_ERR(gmouse->up))
		return PTR_ERR(gmouse->up);
		gmouse->down = devm_gpiod_get(dev, "down", GPIOD_IN);
		if (IS_ERR(gmouse->down))
		return PTR_ERR(gmouse->down);
		gmouse->left = devm_gpiod_get(dev, "left", GPIOD_IN);
		if (IS_ERR(gmouse->left))
		return PTR_ERR(gmouse->left);
		gmouse->right = devm_gpiod_get(dev, "right", GPIOD_IN);
		if (IS_ERR(gmouse->right))
		return PTR_ERR(gmouse->right);

		gmouse->bleft = devm_gpiod_get_optional(dev, "button-left", GPIOD_IN);
		if (IS_ERR(gmouse->bleft))
		return PTR_ERR(gmouse->bleft);
		gmouse->bmiddle = devm_gpiod_get_optional(dev, "button-middle",
		GPIOD_IN);
		if (IS_ERR(gmouse->bmiddle))
		return PTR_ERR(gmouse->bmiddle);
		gmouse->bright = devm_gpiod_get_optional(dev, "button-right",
		GPIOD_IN);
		if (IS_ERR(gmouse->bright))
		return PTR_ERR(gmouse->bright);

		input_poll = devm_input_allocate_polled_device(dev);
		if (!input_poll) {
		dev_err(&pdev->dev, "not enough memory for input device\n");
		error = -ENOMEM;
		goto out_free_gpios;
		dev_err(dev, "not enough memory for input device\n");
		return -ENOMEM;
		}

		platform_set_drvdata(pdev, input_poll);
		@@ -159,61 +134,30 @@ static int gpio_mouse_probe(struct platform_device *pdev)

		input_set_capability(input, EV_REL, REL_X);
		input_set_capability(input, EV_REL, REL_Y);
		if (gmouse->bleft >= 0)
		if (gmouse->bleft)
		input_set_capability(input, EV_KEY, BTN_LEFT);
		if (gmouse->bmiddle >= 0)
		if (gmouse->bmiddle)
		input_set_capability(input, EV_KEY, BTN_MIDDLE);
		if (gmouse->bright >= 0)
		if (gmouse->bright)
		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;
		ret = input_register_polled_device(input_poll);
		if (ret) {
		dev_err(dev, "could not register input device\n");
		return ret;
		}

		dev_dbg(&pdev->dev, "%d ms scan time, buttons: %s%s%s\n",
		dev_dbg(dev, "%d ms scan time, buttons: %s%s%s\n",
		gmouse->scan_ms,
		gmouse->bleft < 0 ? "" : "left ",
		gmouse->bmiddle < 0 ? "" : "middle ",
		gmouse->bright < 0 ? "" : "right");

		return 0;

		out_free_polldev:
		input_free_polled_device(input_poll);

		out_free_gpios:
		while (--i >= 0) {
		pin = gmouse->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 *gmouse = 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 = gmouse->pins[i];
		if (pin >= 0)
		gpio_free(pin);
		}
		gmouse->bleft ? "" : "left ",
		gmouse->bmiddle ? "" : "middle ",
		gmouse->bright ? "" : "right");

		return 0;
		}

		static struct platform_driver gpio_mouse_device_driver = {
		.probe = gpio_mouse_probe,
		.remove = gpio_mouse_remove,
		.driver = {
		.name = "gpio_mouse",
		}
		@@ -224,4 +168,3 @@ 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 */