add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/gpio/gpio-xgene.c
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@@ -1,20 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * AppliedMicro X-Gene SoC GPIO Driver
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  *
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  * Copyright (c) 2014, Applied Micro Circuits Corporation
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  * Author: Feng Kan <fkan@apm.com>.
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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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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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  */
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8
 
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 #include <linux/acpi.h>
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@@ -91,7 +80,10 @@
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 	bank_offset = GPIO_SET_DR_OFFSET + GPIO_BANK_OFFSET(offset);
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 	bit_offset = GPIO_BIT_OFFSET(offset);
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-	return !!(ioread32(chip->base + bank_offset) & BIT(bit_offset));
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+	if (ioread32(chip->base + bank_offset) & BIT(bit_offset))
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+		return GPIO_LINE_DIRECTION_IN;
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+
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+	return GPIO_LINE_DIRECTION_OUT;
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 }
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 static int xgene_gpio_dir_in(struct gpio_chip *gc, unsigned int offset)
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@@ -166,28 +158,16 @@
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 static int xgene_gpio_probe(struct platform_device *pdev)
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 {
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-	struct resource *res;
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 	struct xgene_gpio *gpio;
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 	int err = 0;
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 	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
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-	if (!gpio) {
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-		err = -ENOMEM;
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-		goto err;
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-	}
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+	if (!gpio)
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+		return -ENOMEM;
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-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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-	if (!res) {
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-		err = -EINVAL;
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-		goto err;
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-	}
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-
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-	gpio->base = devm_ioremap_nocache(&pdev->dev, res->start,
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-							resource_size(res));
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-	if (!gpio->base) {
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-		err = -ENOMEM;
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-		goto err;
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-	}
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+	gpio->base = devm_platform_ioremap_resource(pdev, 0);
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+	if (IS_ERR(gpio->base))
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+		return PTR_ERR(gpio->base);
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 	gpio->chip.ngpio = XGENE_MAX_GPIOS;
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@@ -207,14 +187,11 @@
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 	if (err) {
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 		dev_err(&pdev->dev,
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 			"failed to register gpiochip.\n");
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-		goto err;
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+		return err;
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 	}
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 	dev_info(&pdev->dev, "X-Gene GPIO driver registered.\n");
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 	return 0;
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-err:
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-	dev_err(&pdev->dev, "X-Gene GPIO driver registration failed.\n");
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-	return err;
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 }
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 static const struct of_device_id xgene_gpio_of_match[] = {