1 files changed, 196 insertions, 190 deletions

diff --git a/drivers/input/keyboard/gpio_keys_polled.c b/drivers/input/keyboard/gpio_keys_polled.c
index cd5ed9e22168..e6707d72210e 100644
--- a/drivers/input/keyboard/gpio_keys_polled.c
+++ b/drivers/input/keyboard/gpio_keys_polled.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *  Driver for buttons on GPIO lines not capable of generating interrupts
  *
@@ -9,209 +10,225 @@
  *
  *  also was based on: /drivers/input/keyboard/gpio_keys.c
  *	Copyright 2005 Phil Blundell
- *
- *  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/kernel.h>
 #include <linux/module.h>
-#include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/input.h>
-#include <linux/input-polldev.h>
 #include <linux/ioport.h>
 #include <linux/platform_device.h>
 #include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/gpio_keys.h>
-#include <linux/of_platform.h>
-#include <linux/of_gpio.h>
+#include <linux/property.h>
 
 #define DRV_NAME	"gpio-keys-polled"
 
 struct gpio_keys_button_data {
+	struct gpio_desc *gpiod;
 	int last_state;
 	int count;
 	int threshold;
-	int can_sleep;
 };
 
 struct gpio_keys_polled_dev {
-	struct input_polled_dev *poll_dev;
+	struct input_dev *input;
 	struct device *dev;
 	const struct gpio_keys_platform_data *pdata;
-	struct gpio_keys_button_data data[0];
+	unsigned long rel_axis_seen[BITS_TO_LONGS(REL_CNT)];
+	unsigned long abs_axis_seen[BITS_TO_LONGS(ABS_CNT)];
+	struct gpio_keys_button_data data[];
 };
 
+static void gpio_keys_button_event(struct input_dev *input,
+				   const struct gpio_keys_button *button,
+				   int state)
+{
+	struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
+	unsigned int type = button->type ?: EV_KEY;
+
+	if (type == EV_REL) {
+		if (state) {
+			input_event(input, type, button->code, button->value);
+			__set_bit(button->code, bdev->rel_axis_seen);
+		}
+	} else if (type == EV_ABS) {
+		if (state) {
+			input_event(input, type, button->code, button->value);
+			__set_bit(button->code, bdev->abs_axis_seen);
+		}
+	} else {
+		input_event(input, type, button->code, state);
+		input_sync(input);
+	}
+}
+
 static void gpio_keys_polled_check_state(struct input_dev *input,
-					 struct gpio_keys_button *button,
+					 const struct gpio_keys_button *button,
 					 struct gpio_keys_button_data *bdata)
 {
 	int state;
 
-	if (bdata->can_sleep)
-		state = !!gpio_get_value_cansleep(button->gpio);
-	else
-		state = !!gpio_get_value(button->gpio);
+	state = gpiod_get_value_cansleep(bdata->gpiod);
+	if (state < 0) {
+		dev_err(input->dev.parent,
+			"failed to get gpio state: %d\n", state);
+	} else {
+		gpio_keys_button_event(input, button, state);
 
-	if (state != bdata->last_state) {
-		unsigned int type = button->type ?: EV_KEY;
-
-		input_event(input, type, button->code,
-			    !!(state ^ button->active_low));
-		input_sync(input);
-		bdata->count = 0;
-		bdata->last_state = state;
+		if (state != bdata->last_state) {
+			bdata->count = 0;
+			bdata->last_state = state;
+		}
 	}
 }
 
-static void gpio_keys_polled_poll(struct input_polled_dev *dev)
+static void gpio_keys_polled_poll(struct input_dev *input)
 {
-	struct gpio_keys_polled_dev *bdev = dev->private;
+	struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
 	const struct gpio_keys_platform_data *pdata = bdev->pdata;
-	struct input_dev *input = dev->input;
 	int i;
 
+	memset(bdev->rel_axis_seen, 0, sizeof(bdev->rel_axis_seen));
+	memset(bdev->abs_axis_seen, 0, sizeof(bdev->abs_axis_seen));
+
 	for (i = 0; i < pdata->nbuttons; i++) {
 		struct gpio_keys_button_data *bdata = &bdev->data[i];
 
-		if (bdata->count < bdata->threshold)
+		if (bdata->count < bdata->threshold) {
 			bdata->count++;
-		else
+			gpio_keys_button_event(input, &pdata->buttons[i],
+					       bdata->last_state);
+		} else {
 			gpio_keys_polled_check_state(input, &pdata->buttons[i],
 						     bdata);
+		}
 	}
+
+	for_each_set_bit(i, input->relbit, REL_CNT) {
+		if (!test_bit(i, bdev->rel_axis_seen))
+			input_event(input, EV_REL, i, 0);
+	}
+
+	for_each_set_bit(i, input->absbit, ABS_CNT) {
+		if (!test_bit(i, bdev->abs_axis_seen))
+			input_event(input, EV_ABS, i, 0);
+	}
+
+	input_sync(input);
 }
 
-static void gpio_keys_polled_open(struct input_polled_dev *dev)
+static int gpio_keys_polled_open(struct input_dev *input)
 {
-	struct gpio_keys_polled_dev *bdev = dev->private;
+	struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
 	const struct gpio_keys_platform_data *pdata = bdev->pdata;
 
 	if (pdata->enable)
 		pdata->enable(bdev->dev);
+
+	return 0;
 }
 
-static void gpio_keys_polled_close(struct input_polled_dev *dev)
+static void gpio_keys_polled_close(struct input_dev *input)
 {
-	struct gpio_keys_polled_dev *bdev = dev->private;
+	struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
 	const struct gpio_keys_platform_data *pdata = bdev->pdata;
 
 	if (pdata->disable)
 		pdata->disable(bdev->dev);
 }
 
-#ifdef CONFIG_OF
-static struct gpio_keys_platform_data *gpio_keys_polled_get_devtree_pdata(struct device *dev)
+static struct gpio_keys_platform_data *
+gpio_keys_polled_get_devtree_pdata(struct device *dev)
 {
-	struct device_node *node, *pp;
 	struct gpio_keys_platform_data *pdata;
 	struct gpio_keys_button *button;
-	int error;
 	int nbuttons;
-	int i;
-
-	node = dev->of_node;
-	if (!node)
-		return NULL;
 
-	nbuttons = of_get_child_count(node);
+	nbuttons = device_get_child_node_count(dev);
 	if (nbuttons == 0)
-		return NULL;
-
-	pdata = kzalloc(sizeof(*pdata) + nbuttons * (sizeof *button),
-			GFP_KERNEL);
-	if (!pdata) {
-		error = -ENOMEM;
-		goto err_out;
-	}
-
-	pdata->buttons = (struct gpio_keys_button *)(pdata + 1);
-	pdata->nbuttons = nbuttons;
+		return ERR_PTR(-EINVAL);
 
-	pdata->rep = !!of_get_property(node, "autorepeat", NULL);
-	of_property_read_u32(node, "poll-interval", &pdata->poll_interval);
+	pdata = devm_kzalloc(dev, sizeof(*pdata) + nbuttons * sizeof(*button),
+			     GFP_KERNEL);
+	if (!pdata)
+		return ERR_PTR(-ENOMEM);
 
-	i = 0;
-	for_each_child_of_node(node, pp) {
-		int gpio;
-		enum of_gpio_flags flags;
+	button = (struct gpio_keys_button *)(pdata + 1);
 
-		if (!of_find_property(pp, "gpios", NULL)) {
-			pdata->nbuttons--;
-			dev_warn(dev, "Found button without gpios\n");
-			continue;
-		}
-
-		gpio = of_get_gpio_flags(pp, 0, &flags);
-		if (gpio < 0) {
-			error = gpio;
-			if (error != -EPROBE_DEFER)
-				dev_err(dev,
-					"Failed to get gpio flags, error: %d\n",
-					error);
-			goto err_free_pdata;
-		}
+	pdata->buttons = button;
+	pdata->nbuttons = nbuttons;
 
-		button = &pdata->buttons[i++];
+	pdata->rep = device_property_present(dev, "autorepeat");
+	device_property_read_u32(dev, "poll-interval", &pdata->poll_interval);
 
-		button->gpio = gpio;
-		button->active_low = flags & OF_GPIO_ACTIVE_LOW;
+	device_property_read_string(dev, "label", &pdata->name);
 
-		if (of_property_read_u32(pp, "linux,code", &button->code)) {
-			dev_err(dev, "Button without keycode: 0x%x\n",
-				button->gpio);
-			error = -EINVAL;
-			goto err_free_pdata;
+	device_for_each_child_node_scoped(dev, child) {
+		if (fwnode_property_read_u32(child, "linux,code",
+					     &button->code)) {
+			dev_err(dev, "button without keycode\n");
+			return ERR_PTR(-EINVAL);
 		}
 
-		button->desc = of_get_property(pp, "label", NULL);
+		fwnode_property_read_string(child, "label", &button->desc);
 
-		if (of_property_read_u32(pp, "linux,input-type", &button->type))
+		if (fwnode_property_read_u32(child, "linux,input-type",
+					     &button->type))
 			button->type = EV_KEY;
 
-		button->wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL);
+		if (fwnode_property_read_u32(child, "linux,input-value",
+					     (u32 *)&button->value))
+			button->value = 1;
+
+		button->wakeup =
+			fwnode_property_read_bool(child, "wakeup-source") ||
+			/* legacy name */
+			fwnode_property_read_bool(child, "gpio-key,wakeup");
 
-		if (of_property_read_u32(pp, "debounce-interval",
-					 &button->debounce_interval))
+		if (fwnode_property_read_u32(child, "debounce-interval",
+					     &button->debounce_interval))
 			button->debounce_interval = 5;
-	}
 
-	if (pdata->nbuttons == 0) {
-		error = -EINVAL;
-		goto err_free_pdata;
+		button++;
 	}
 
 	return pdata;
+}
 
-err_free_pdata:
-	kfree(pdata);
-err_out:
-	return ERR_PTR(error);
+static void gpio_keys_polled_set_abs_params(struct input_dev *input,
+	const struct gpio_keys_platform_data *pdata, unsigned int code)
+{
+	int i, min = 0, max = 0;
+
+	for (i = 0; i < pdata->nbuttons; i++) {
+		const struct gpio_keys_button *button = &pdata->buttons[i];
+
+		if (button->type != EV_ABS || button->code != code)
+			continue;
+
+		if (button->value < min)
+			min = button->value;
+		if (button->value > max)
+			max = button->value;
+	}
+
+	input_set_abs_params(input, code, min, max, 0, 0);
 }
 
-static struct of_device_id gpio_keys_polled_of_match[] = {
+static const struct of_device_id gpio_keys_polled_of_match[] = {
 	{ .compatible = "gpio-keys-polled", },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match);
 
-#else
-
-static inline struct gpio_keys_platform_data *
-gpio_keys_polled_get_devtree_pdata(struct device *dev)
-{
-	return NULL;
-}
-#endif
-
 static int gpio_keys_polled_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct fwnode_handle *child = NULL;
 	const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
 	struct gpio_keys_polled_dev *bdev;
-	struct input_polled_dev *poll_dev;
 	struct input_dev *input;
 	int error;
 	int i;
@@ -220,93 +237,123 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
 		pdata = gpio_keys_polled_get_devtree_pdata(dev);
 		if (IS_ERR(pdata))
 			return PTR_ERR(pdata);
-		if (!pdata) {
-			dev_err(dev, "missing platform data\n");
-			return -EINVAL;
-		}
 	}
 
 	if (!pdata->poll_interval) {
 		dev_err(dev, "missing poll_interval value\n");
-		error = -EINVAL;
-		goto err_free_pdata;
+		return -EINVAL;
 	}
 
-	bdev = kzalloc(sizeof(struct gpio_keys_polled_dev) +
-		       pdata->nbuttons * sizeof(struct gpio_keys_button_data),
-		       GFP_KERNEL);
+	bdev = devm_kzalloc(dev, struct_size(bdev, data, pdata->nbuttons),
+			    GFP_KERNEL);
 	if (!bdev) {
 		dev_err(dev, "no memory for private data\n");
-		error = -ENOMEM;
-		goto err_free_pdata;
+		return -ENOMEM;
 	}
 
-	poll_dev = input_allocate_polled_device();
-	if (!poll_dev) {
-		dev_err(dev, "no memory for polled device\n");
-		error = -ENOMEM;
-		goto err_free_bdev;
+	input = devm_input_allocate_device(dev);
+	if (!input) {
+		dev_err(dev, "no memory for input device\n");
+		return -ENOMEM;
 	}
 
-	poll_dev->private = bdev;
-	poll_dev->poll = gpio_keys_polled_poll;
-	poll_dev->poll_interval = pdata->poll_interval;
-	poll_dev->open = gpio_keys_polled_open;
-	poll_dev->close = gpio_keys_polled_close;
+	input_set_drvdata(input, bdev);
 
-	input = poll_dev->input;
-
-	input->name = pdev->name;
+	input->name = pdata->name ?: pdev->name;
 	input->phys = DRV_NAME"/input0";
-	input->dev.parent = &pdev->dev;
 
 	input->id.bustype = BUS_HOST;
 	input->id.vendor = 0x0001;
 	input->id.product = 0x0001;
 	input->id.version = 0x0100;
 
+	input->open = gpio_keys_polled_open;
+	input->close = gpio_keys_polled_close;
+
 	__set_bit(EV_KEY, input->evbit);
 	if (pdata->rep)
 		__set_bit(EV_REP, input->evbit);
 
 	for (i = 0; i < pdata->nbuttons; i++) {
-		struct gpio_keys_button *button = &pdata->buttons[i];
+		const struct gpio_keys_button *button = &pdata->buttons[i];
 		struct gpio_keys_button_data *bdata = &bdev->data[i];
-		unsigned int gpio = button->gpio;
 		unsigned int type = button->type ?: EV_KEY;
 
 		if (button->wakeup) {
 			dev_err(dev, DRV_NAME " does not support wakeup\n");
-			error = -EINVAL;
-			goto err_free_gpio;
+			fwnode_handle_put(child);
+			return -EINVAL;
 		}
 
-		error = gpio_request_one(gpio, GPIOF_IN,
-					 button->desc ?: DRV_NAME);
-		if (error) {
-			dev_err(dev, "unable to claim gpio %u, err=%d\n",
-				gpio, error);
-			goto err_free_gpio;
+		if (!dev_get_platdata(dev)) {
+			/* No legacy static platform data */
+			child = device_get_next_child_node(dev, child);
+			if (!child) {
+				dev_err(dev, "missing child device node\n");
+				return -EINVAL;
+			}
+
+			bdata->gpiod = devm_fwnode_gpiod_get(dev, child,
+							     NULL, GPIOD_IN,
+							     button->desc);
+			if (IS_ERR(bdata->gpiod)) {
+				fwnode_handle_put(child);
+				return dev_err_probe(dev, PTR_ERR(bdata->gpiod),
+						     "failed to get gpio\n");
+			}
+		} else if (gpio_is_valid(button->gpio)) {
+			/*
+			 * Legacy GPIO number so request the GPIO here and
+			 * convert it to descriptor.
+			 */
+			error = devm_gpio_request_one(dev, button->gpio, GPIOF_IN,
+						      button->desc ? : DRV_NAME);
+			if (error)
+				return dev_err_probe(dev, error,
+						     "unable to claim gpio %u\n",
+						     button->gpio);
+
+			bdata->gpiod = gpio_to_desc(button->gpio);
+			if (!bdata->gpiod) {
+				dev_err(dev,
+					"unable to convert gpio %u to descriptor\n",
+					button->gpio);
+				return -EINVAL;
+			}
+
+			if (button->active_low ^ gpiod_is_active_low(bdata->gpiod))
+				gpiod_toggle_active_low(bdata->gpiod);
 		}
 
-		bdata->can_sleep = gpio_cansleep(gpio);
 		bdata->last_state = -1;
 		bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
 						pdata->poll_interval);
 
 		input_set_capability(input, type, button->code);
+		if (type == EV_ABS)
+			gpio_keys_polled_set_abs_params(input, pdata,
+							button->code);
 	}
 
-	bdev->poll_dev = poll_dev;
+	fwnode_handle_put(child);
+
+	bdev->input = input;
 	bdev->dev = dev;
 	bdev->pdata = pdata;
-	platform_set_drvdata(pdev, bdev);
 
-	error = input_register_polled_device(poll_dev);
+	error = input_setup_polling(input, gpio_keys_polled_poll);
+	if (error) {
+		dev_err(dev, "unable to set up polling, err=%d\n", error);
+		return error;
+	}
+
+	input_set_poll_interval(input, pdata->poll_interval);
+
+	error = input_register_device(input);
 	if (error) {
 		dev_err(dev, "unable to register polled device, err=%d\n",
 			error);
-		goto err_free_gpio;
+		return error;
 	}
 
 	/* report initial state of the buttons */
@@ -314,57 +361,16 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
 		gpio_keys_polled_check_state(input, &pdata->buttons[i],
 					     &bdev->data[i]);
 
-	return 0;
-
-err_free_gpio:
-	while (--i >= 0)
-		gpio_free(pdata->buttons[i].gpio);
-
-	input_free_polled_device(poll_dev);
-
-err_free_bdev:
-	kfree(bdev);
-
-err_free_pdata:
-	/* If we have no platform_data, we allocated pdata dynamically.  */
-	if (!dev_get_platdata(&pdev->dev))
-		kfree(pdata);
-
-	return error;
-}
-
-static int gpio_keys_polled_remove(struct platform_device *pdev)
-{
-	struct gpio_keys_polled_dev *bdev = platform_get_drvdata(pdev);
-	const struct gpio_keys_platform_data *pdata = bdev->pdata;
-	int i;
-
-	input_unregister_polled_device(bdev->poll_dev);
-
-	for (i = 0; i < pdata->nbuttons; i++)
-		gpio_free(pdata->buttons[i].gpio);
-
-	input_free_polled_device(bdev->poll_dev);
-
-	/*
-	 * If we had no platform_data, we allocated pdata dynamically and
-	 * must free it here.
-	 */
-	if (!dev_get_platdata(&pdev->dev))
-		kfree(pdata);
-
-	kfree(bdev);
+	input_sync(input);
 
 	return 0;
 }
 
 static struct platform_driver gpio_keys_polled_driver = {
 	.probe	= gpio_keys_polled_probe,
-	.remove	= gpio_keys_polled_remove,
 	.driver	= {
 		.name	= DRV_NAME,
-		.owner	= THIS_MODULE,
-		.of_match_table = of_match_ptr(gpio_keys_polled_of_match),
+		.of_match_table = gpio_keys_polled_of_match,
 	},
 };
 module_platform_driver(gpio_keys_polled_driver);