1 files changed, 101 insertions, 105 deletions

diff --git a/drivers/input/mouse/gpio_mouse.c b/drivers/input/mouse/gpio_mouse.c
index ced07391304b..a26d8be6f795 100644
--- a/drivers/input/mouse/gpio_mouse.c
+++ b/drivers/input/mouse/gpio_mouse.c
@@ -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
@@ -11,9 +12,35 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/input-polldev.h>
-#include <linux/gpio.h>
-#include <linux/gpio_mouse.h>
-
+#include <linux/gpio/consumer.h>
+#include <linux/property.h>
+#include <linux/of.h>
+
+/**
+ * struct gpio_mouse
+ * @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.
+ * @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 {
+	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;
+};
 
 /*
  * Timer function which is run every scan_ms ms when the device is opened.
@@ -21,24 +48,22 @@
  */
 static void gpio_mouse_scan(struct input_polled_dev *dev)
 {
-	struct gpio_mouse_platform_data *gpio = dev->private;
+	struct gpio_mouse *gpio = dev->private;
 	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);
@@ -47,65 +72,61 @@ static void gpio_mouse_scan(struct input_polled_dev *dev)
 
 static int gpio_mouse_probe(struct platform_device *pdev)
 {
-	struct gpio_mouse_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct device *dev = &pdev->dev;
+	struct gpio_mouse *gmouse;
 	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);
-		}
+	int ret;
+
+	gmouse = devm_kzalloc(dev, sizeof(*gmouse), GFP_KERNEL);
+	if (!gmouse)
+		return -ENOMEM;
+
+	/* 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);
 
 	/* set input-polldev handlers */
-	input_poll->private = pdata;
+	input_poll->private = gmouse;
 	input_poll->poll = gpio_mouse_scan;
-	input_poll->poll_interval = pdata->scan_ms;
+	input_poll->poll_interval = gmouse->scan_ms;
 
 	input = input_poll->input;
 	input->name = pdev->name;
@@ -114,63 +135,39 @@ 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 (pdata->bleft >= 0)
+	if (gmouse->bleft)
 		input_set_capability(input, EV_KEY, BTN_LEFT);
-	if (pdata->bmiddle >= 0)
+	if (gmouse->bmiddle)
 		input_set_capability(input, EV_KEY, BTN_MIDDLE);
-	if (pdata->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",
-			pdata->scan_ms,
-			pdata->bleft < 0 ? "" : "left ",
-			pdata->bmiddle < 0 ? "" : "middle ",
-			pdata->bright < 0 ? "" : "right");
+	dev_dbg(dev, "%d ms scan time, buttons: %s%s%s\n",
+		gmouse->scan_ms,
+		gmouse->bleft ? "" : "left ",
+		gmouse->bmiddle ? "" : "middle ",
+		gmouse->bright ? "" : "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 const struct of_device_id gpio_mouse_of_match[] = {
+	{ .compatible = "gpio-mouse", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, gpio_mouse_of_match);
 
 static struct platform_driver gpio_mouse_device_driver = {
 	.probe		= gpio_mouse_probe,
-	.remove		= gpio_mouse_remove,
 	.driver		= {
 		.name	= "gpio_mouse",
+		.of_match_table = gpio_mouse_of_match,
 	}
 };
 module_platform_driver(gpio_mouse_device_driver);
@@ -179,4 +176,3 @@ 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 */
-