add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/input/keyboard/gpio_keys_polled.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  *  Driver for buttons on GPIO lines not capable of generating interrupts
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  *
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@@ -9,17 +10,12 @@
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  *
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  *  also was based on: /drivers/input/keyboard/gpio_keys.c
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  *	Copyright 2005 Phil Blundell
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- *
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- *  This program is free software; you can redistribute it and/or modify
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- *  it under the terms of the GNU General Public License version 2 as
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- *  published by the Free Software Foundation.
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  */
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 #include <linux/kernel.h>
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 #include <linux/module.h>
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 #include <linux/slab.h>
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 #include <linux/input.h>
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-#include <linux/input-polldev.h>
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 #include <linux/ioport.h>
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 #include <linux/platform_device.h>
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 #include <linux/gpio.h>
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@@ -37,20 +33,19 @@
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 };
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 struct gpio_keys_polled_dev {
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-	struct input_polled_dev *poll_dev;
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+	struct input_dev *input;
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 	struct device *dev;
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 	const struct gpio_keys_platform_data *pdata;
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 	unsigned long rel_axis_seen[BITS_TO_LONGS(REL_CNT)];
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 	unsigned long abs_axis_seen[BITS_TO_LONGS(ABS_CNT)];
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-	struct gpio_keys_button_data data[0];
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+	struct gpio_keys_button_data data[];
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 };
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-static void gpio_keys_button_event(struct input_polled_dev *dev,
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+static void gpio_keys_button_event(struct input_dev *input,
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 				   const struct gpio_keys_button *button,
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 				   int state)
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 {
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-	struct gpio_keys_polled_dev *bdev = dev->private;
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-	struct input_dev *input = dev->input;
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+	struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
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 	unsigned int type = button->type ?: EV_KEY;
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 	if (type == EV_REL) {
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@@ -69,7 +64,7 @@
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 	}
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 }
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-static void gpio_keys_polled_check_state(struct input_polled_dev *dev,
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+static void gpio_keys_polled_check_state(struct input_dev *input,
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 					 const struct gpio_keys_button *button,
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 					 struct gpio_keys_button_data *bdata)
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 {
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@@ -77,10 +72,10 @@
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 	state = gpiod_get_value_cansleep(bdata->gpiod);
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 	if (state < 0) {
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-		dev_err(dev->input->dev.parent,
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+		dev_err(input->dev.parent,
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 			"failed to get gpio state: %d\n", state);
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 	} else {
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-		gpio_keys_button_event(dev, button, state);
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+		gpio_keys_button_event(input, button, state);
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 		if (state != bdata->last_state) {
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 			bdata->count = 0;
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@@ -89,11 +84,10 @@
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 	}
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 }
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-static void gpio_keys_polled_poll(struct input_polled_dev *dev)
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+static void gpio_keys_polled_poll(struct input_dev *input)
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 {
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-	struct gpio_keys_polled_dev *bdev = dev->private;
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+	struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
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 	const struct gpio_keys_platform_data *pdata = bdev->pdata;
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-	struct input_dev *input = dev->input;
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 	int i;
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 	memset(bdev->rel_axis_seen, 0, sizeof(bdev->rel_axis_seen));
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@@ -104,10 +98,10 @@
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 		if (bdata->count < bdata->threshold) {
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 			bdata->count++;
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-			gpio_keys_button_event(dev, &pdata->buttons[i],
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+			gpio_keys_button_event(input, &pdata->buttons[i],
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 					       bdata->last_state);
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 		} else {
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-			gpio_keys_polled_check_state(dev, &pdata->buttons[i],
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+			gpio_keys_polled_check_state(input, &pdata->buttons[i],
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 						     bdata);
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 		}
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 	}
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@@ -125,18 +119,20 @@
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 	input_sync(input);
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 }
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-static void gpio_keys_polled_open(struct input_polled_dev *dev)
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+static int gpio_keys_polled_open(struct input_dev *input)
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 {
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-	struct gpio_keys_polled_dev *bdev = dev->private;
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+	struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
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 	const struct gpio_keys_platform_data *pdata = bdev->pdata;
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 	if (pdata->enable)
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 		pdata->enable(bdev->dev);
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+
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+	return 0;
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 }
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-static void gpio_keys_polled_close(struct input_polled_dev *dev)
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+static void gpio_keys_polled_close(struct input_dev *input)
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 {
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-	struct gpio_keys_polled_dev *bdev = dev->private;
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+	struct gpio_keys_polled_dev *bdev = input_get_drvdata(input);
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 	const struct gpio_keys_platform_data *pdata = bdev->pdata;
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 	if (pdata->disable)
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@@ -167,6 +163,8 @@
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 	pdata->rep = device_property_present(dev, "autorepeat");
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 	device_property_read_u32(dev, "poll-interval", &pdata->poll_interval);
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+
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+	device_property_read_string(dev, "label", &pdata->name);
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 	device_for_each_child_node(dev, child) {
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 		if (fwnode_property_read_u32(child, "linux,code",
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@@ -233,9 +231,7 @@
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 	struct fwnode_handle *child = NULL;
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 	const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
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 	struct gpio_keys_polled_dev *bdev;
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-	struct input_polled_dev *poll_dev;
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 	struct input_dev *input;
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-	size_t size;
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 	int error;
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 	int i;
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@@ -250,35 +246,31 @@
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 		return -EINVAL;
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 	}
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-	size = sizeof(struct gpio_keys_polled_dev) +
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-			pdata->nbuttons * sizeof(struct gpio_keys_button_data);
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-	bdev = devm_kzalloc(dev, size, GFP_KERNEL);
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+	bdev = devm_kzalloc(dev, struct_size(bdev, data, pdata->nbuttons),
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+			    GFP_KERNEL);
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 	if (!bdev) {
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 		dev_err(dev, "no memory for private data\n");
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 		return -ENOMEM;
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 	}
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-	poll_dev = devm_input_allocate_polled_device(dev);
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-	if (!poll_dev) {
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-		dev_err(dev, "no memory for polled device\n");
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+	input = devm_input_allocate_device(dev);
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+	if (!input) {
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+		dev_err(dev, "no memory for input device\n");
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 		return -ENOMEM;
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 	}
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-	poll_dev->private = bdev;
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-	poll_dev->poll = gpio_keys_polled_poll;
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-	poll_dev->poll_interval = pdata->poll_interval;
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-	poll_dev->open = gpio_keys_polled_open;
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-	poll_dev->close = gpio_keys_polled_close;
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+	input_set_drvdata(input, bdev);
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-	input = poll_dev->input;
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-
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-	input->name = pdev->name;
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+	input->name = pdata->name ?: pdev->name;
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 	input->phys = DRV_NAME"/input0";
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 	input->id.bustype = BUS_HOST;
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 	input->id.vendor = 0x0001;
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 	input->id.product = 0x0001;
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 	input->id.version = 0x0100;
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+
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+	input->open = gpio_keys_polled_open;
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+	input->close = gpio_keys_polled_close;
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 	__set_bit(EV_KEY, input->evbit);
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 	if (pdata->rep)
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@@ -303,10 +295,9 @@
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 				return -EINVAL;
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 			}
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-			bdata->gpiod = devm_fwnode_get_gpiod_from_child(dev,
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-								NULL, child,
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-								GPIOD_IN,
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-								button->desc);
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+			bdata->gpiod = devm_fwnode_gpiod_get(dev, child,
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+							     NULL, GPIOD_IN,
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+							     button->desc);
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 			if (IS_ERR(bdata->gpiod)) {
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 				error = PTR_ERR(bdata->gpiod);
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 				if (error != -EPROBE_DEFER)
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@@ -356,11 +347,19 @@
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 	fwnode_handle_put(child);
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-	bdev->poll_dev = poll_dev;
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+	bdev->input = input;
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 	bdev->dev = dev;
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 	bdev->pdata = pdata;
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-	error = input_register_polled_device(poll_dev);
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+	error = input_setup_polling(input, gpio_keys_polled_poll);
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+	if (error) {
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+		dev_err(dev, "unable to set up polling, err=%d\n", error);
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+		return error;
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+	}
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+
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+	input_set_poll_interval(input, pdata->poll_interval);
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+
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+	error = input_register_device(input);
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 	if (error) {
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 		dev_err(dev, "unable to register polled device, err=%d\n",
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 			error);
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@@ -369,7 +368,7 @@
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 	/* report initial state of the buttons */
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 	for (i = 0; i < pdata->nbuttons; i++)
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-		gpio_keys_polled_check_state(poll_dev, &pdata->buttons[i],
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+		gpio_keys_polled_check_state(input, &pdata->buttons[i],
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 					     &bdev->data[i]);
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 	input_sync(input);