add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/gpio/gpio-pl061.c
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@@ -1,11 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (C) 2008, 2009 Provigent Ltd.
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  *
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  * Author: Baruch Siach <baruch@tkos.co.il>
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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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  * Driver for the ARM PrimeCell(tm) General Purpose Input/Output (PL061)
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  *
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@@ -19,6 +16,7 @@
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 #include <linux/interrupt.h>
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 #include <linux/irq.h>
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 #include <linux/irqchip/chained_irq.h>
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+#include <linux/module.h>
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 #include <linux/bitops.h>
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 #include <linux/gpio/driver.h>
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 #include <linux/device.h>
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@@ -66,7 +64,10 @@
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 {
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 	struct pl061 *pl061 = gpiochip_get_data(gc);
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-	return !(readb(pl061->base + GPIODIR) & BIT(offset));
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+	if (readb(pl061->base + GPIODIR) & BIT(offset))
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+		return GPIO_LINE_DIRECTION_OUT;
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+
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+	return GPIO_LINE_DIRECTION_IN;
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 }
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 static int pl061_direction_input(struct gpio_chip *gc, unsigned offset)
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@@ -286,6 +287,7 @@
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 {
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 	struct device *dev = &adev->dev;
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 	struct pl061 *pl061;
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+	struct gpio_irq_chip *girq;
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 	int ret, irq;
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 	pl061 = devm_kzalloc(dev, sizeof(*pl061), GFP_KERNEL);
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@@ -297,11 +299,8 @@
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 		return PTR_ERR(pl061->base);
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 	raw_spin_lock_init(&pl061->lock);
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-	if (of_property_read_bool(dev->of_node, "gpio-ranges")) {
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-		pl061->gc.request = gpiochip_generic_request;
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-		pl061->gc.free = gpiochip_generic_free;
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-	}
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-
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+	pl061->gc.request = gpiochip_generic_request;
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+	pl061->gc.free = gpiochip_generic_free;
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 	pl061->gc.base = -1;
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 	pl061->gc.get_direction = pl061_get_direction;
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 	pl061->gc.direction_input = pl061_direction_input;
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@@ -312,10 +311,6 @@
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 	pl061->gc.label = dev_name(dev);
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 	pl061->gc.parent = dev;
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 	pl061->gc.owner = THIS_MODULE;
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-
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-	ret = gpiochip_add_data(&pl061->gc, pl061);
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-	if (ret)
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-		return ret;
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 	/*
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 	 * irq_chip support
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@@ -329,25 +324,28 @@
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 	writeb(0, pl061->base + GPIOIE); /* disable irqs */
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 	irq = adev->irq[0];
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-	if (irq < 0) {
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-		dev_err(&adev->dev, "invalid IRQ\n");
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-		return -ENODEV;
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-	}
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+	if (!irq)
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+		dev_warn(&adev->dev, "IRQ support disabled\n");
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 	pl061->parent_irq = irq;
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-	ret = gpiochip_irqchip_add(&pl061->gc, &pl061->irq_chip,
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-				   0, handle_bad_irq,
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-				   IRQ_TYPE_NONE);
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-	if (ret) {
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-		dev_info(&adev->dev, "could not add irqchip\n");
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+	girq = &pl061->gc.irq;
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+	girq->chip = &pl061->irq_chip;
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+	girq->parent_handler = pl061_irq_handler;
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+	girq->num_parents = 1;
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+	girq->parents = devm_kcalloc(dev, 1, sizeof(*girq->parents),
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+				     GFP_KERNEL);
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+	if (!girq->parents)
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+		return -ENOMEM;
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+	girq->parents[0] = irq;
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+	girq->default_type = IRQ_TYPE_NONE;
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+	girq->handler = handle_bad_irq;
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+
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+	ret = devm_gpiochip_add_data(dev, &pl061->gc, pl061);
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+	if (ret)
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 		return ret;
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-	}
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-	gpiochip_set_chained_irqchip(&pl061->gc, &pl061->irq_chip,
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-				     irq, pl061_irq_handler);
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 	amba_set_drvdata(adev, pl061);
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-	dev_info(&adev->dev, "PL061 GPIO chip @%pa registered\n",
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-		 &adev->res.start);
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+	dev_info(dev, "PL061 GPIO chip registered\n");
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 	return 0;
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 }
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@@ -411,6 +409,7 @@
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 	},
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 	{ 0, 0 },
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 };
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+MODULE_DEVICE_TABLE(amba, pl061_ids);
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 static struct amba_driver pl061_gpio_driver = {
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 	.drv = {
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@@ -422,9 +421,6 @@
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 	.id_table	= pl061_ids,
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 	.probe		= pl061_probe,
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 };
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+module_amba_driver(pl061_gpio_driver);
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-static int __init pl061_gpio_init(void)
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-{
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-	return amba_driver_register(&pl061_gpio_driver);
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-}
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-device_initcall(pl061_gpio_init);
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+MODULE_LICENSE("GPL v2");