linux-kernel - [PATCH v2 5/5] extcon: extcon-max8997: Simplify driver using devm

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Date:   Tue, 18 May 2021 15:33:17 +0300
From:   Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
To:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Matti Vaittinen <mazziesaccount@...il.com>
Cc:     hanwoo Choi <cw00.choi@...sung.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 5/5] extcon: extcon-max8997: Simplify driver using devm

Simplify driver by switching to use the resource managed IRQ
requesting and resource managed work-queue initialization.

Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
---
Changelog:
 v2:
  - IRQ freeing fix splitted in own patch

Please note that the change is compile-tested only. All proper testing is
highly appreciated.
---
 drivers/extcon/extcon-max8997.c | 47 +++++++++++----------------------
 1 file changed, 16 insertions(+), 31 deletions(-)

diff --git a/drivers/extcon/extcon-max8997.c b/drivers/extcon/extcon-max8997.c
index c15a612067af..bbc592823570 100644
--- a/drivers/extcon/extcon-max8997.c
+++ b/drivers/extcon/extcon-max8997.c
@@ -5,6 +5,7 @@
 //  Copyright (C) 2012 Samsung Electronics
 //  Donggeun Kim <dg77.kim@...sung.com>
 
+#include <linux/devm-helpers.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/i2c.h>
@@ -650,27 +651,30 @@ static int max8997_muic_probe(struct platform_device *pdev)
 	mutex_init(&info->mutex);
 
 	INIT_WORK(&info->irq_work, max8997_muic_irq_work);
+	ret = devm_work_autocancel(&pdev->dev, &info->irq_work,
+				   max8997_muic_irq_work);
+	if (ret)
+		return ret;
 
 	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
 		struct max8997_muic_irq *muic_irq = &muic_irqs[i];
 		unsigned int virq = 0;
 
 		virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
-		if (!virq) {
-			ret = -EINVAL;
-			goto err_irq;
-		}
+		if (!virq)
+			return -EINVAL;
+
 		muic_irq->virq = virq;
 
-		ret = request_threaded_irq(virq, NULL,
-				max8997_muic_irq_handler,
-				IRQF_NO_SUSPEND,
-				muic_irq->name, info);
+		ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
+						max8997_muic_irq_handler,
+						IRQF_NO_SUSPEND,
+						muic_irq->name, info);
 		if (ret) {
 			dev_err(&pdev->dev,
 				"failed: irq request (IRQ: %d, error :%d)\n",
 				muic_irq->irq, ret);
-			goto err_irq;
+			return ret;
 		}
 	}
 
@@ -678,14 +682,13 @@ static int max8997_muic_probe(struct platform_device *pdev)
 	info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
 	if (IS_ERR(info->edev)) {
 		dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
-		ret = PTR_ERR(info->edev);
-		goto err_irq;
+		return PTR_ERR(info->edev);
 	}
 
 	ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register extcon device\n");
-		goto err_irq;
+		return ret;
 	}
 
 	if (pdata && pdata->muic_pdata) {
@@ -733,7 +736,7 @@ static int max8997_muic_probe(struct platform_device *pdev)
 				2, info->status);
 	if (ret) {
 		dev_err(info->dev, "failed to read MUIC register\n");
-		goto err_irq;
+		return ret;
 	}
 	cable_type = max8997_muic_get_cable_type(info,
 					   MAX8997_CABLE_GROUP_ADC, &attached);
@@ -756,23 +759,6 @@ static int max8997_muic_probe(struct platform_device *pdev)
 			delay_jiffies);
 
 	return 0;
-
-err_irq:
-	while (--i >= 0)
-		free_irq(muic_irqs[i].virq, info);
-	return ret;
-}
-
-static int max8997_muic_remove(struct platform_device *pdev)
-{
-	struct max8997_muic_info *info = platform_get_drvdata(pdev);
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
-		free_irq(muic_irqs[i].virq, info);
-	cancel_work_sync(&info->irq_work);
-
-	return 0;
 }
 
 static struct platform_driver max8997_muic_driver = {
@@ -780,7 +766,6 @@ static struct platform_driver max8997_muic_driver = {
 		.name	= DEV_NAME,
 	},
 	.probe		= max8997_muic_probe,
-	.remove		= max8997_muic_remove,
 };
 
 module_platform_driver(max8997_muic_driver);
-- 
2.25.4


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

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