linux-kernel - [PATCH 06/10] watchdog: ebc-c384_wdt: Utilize the ISA bus driver

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Message-Id: <1f5bf2e21006f0fd4f10ab3948cf69a737c0b039.1460040201.git.vilhelm.gray@gmail.com>
Date:	Thu,  7 Apr 2016 10:47:27 -0400
From:	William Breathitt Gray <vilhelm.gray@...il.com>
To:	gregkh@...uxfoundation.org, tglx@...utronix.de, jic23@...nel.org,
	knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net, wim@...ana.be,
	linux@...ck-us.net, linus.walleij@...aro.org, gnurou@...il.com
Cc:	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	linux-watchdog@...r.kernel.org, linux-gpio@...r.kernel.org,
	William Breathitt Gray <vilhelm.gray@...il.com>
Subject: [PATCH 06/10] watchdog: ebc-c384_wdt: Utilize the ISA bus driver

The WinSystems EBC-C384 watchdog timer is controlled via ISA bus
communication. As such, the ISA bus driver is more appropriate than the
platform driver for the WinSystems EBC-C384 watchdog timer driver.

Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
---
 drivers/watchdog/Kconfig        |  2 +-
 drivers/watchdog/ebc-c384_wdt.c | 43 ++++++++++-------------------------------
 2 files changed, 11 insertions(+), 34 deletions(-)

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index fb94765..b10761d 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -738,7 +738,7 @@ config ALIM7101_WDT
 
 config EBC_C384_WDT
 	tristate "WinSystems EBC-C384 Watchdog Timer"
-	depends on X86
+	depends on X86 && ISA_BUS
 	select WATCHDOG_CORE
 	help
 	  Enables watchdog timer support for the watchdog timer on the
diff --git a/drivers/watchdog/ebc-c384_wdt.c b/drivers/watchdog/ebc-c384_wdt.c
index 77fda0b..4b849b8 100644
--- a/drivers/watchdog/ebc-c384_wdt.c
+++ b/drivers/watchdog/ebc-c384_wdt.c
@@ -16,10 +16,10 @@
 #include <linux/errno.h>
 #include <linux/io.h>
 #include <linux/ioport.h>
+#include <linux/isa.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
-#include <linux/platform_device.h>
 #include <linux/types.h>
 #include <linux/watchdog.h>
 
@@ -95,9 +95,8 @@ static const struct watchdog_info ebc_c384_wdt_info = {
 	.identity = MODULE_NAME
 };
 
-static int __init ebc_c384_wdt_probe(struct platform_device *pdev)
+static int ebc_c384_wdt_probe(struct device *dev, unsigned int id)
 {
-	struct device *dev = &pdev->dev;
 	struct watchdog_device *wdd;
 
 	if (!devm_request_region(dev, BASE_ADDR, ADDR_EXTENT, dev_name(dev))) {
@@ -122,61 +121,39 @@ static int __init ebc_c384_wdt_probe(struct platform_device *pdev)
 		dev_warn(dev, "Invalid timeout (%u seconds), using default (%u seconds)\n",
 			timeout, WATCHDOG_TIMEOUT);
 
-	platform_set_drvdata(pdev, wdd);
+	dev_set_drvdata(dev, wdd);
 
 	return watchdog_register_device(wdd);
 }
 
-static int ebc_c384_wdt_remove(struct platform_device *pdev)
+static int ebc_c384_wdt_remove(struct device *dev, unsigned int id)
 {
-	struct watchdog_device *wdd = platform_get_drvdata(pdev);
+	struct watchdog_device *wdd = dev_get_drvdata(dev);
 
 	watchdog_unregister_device(wdd);
 
 	return 0;
 }
 
-static struct platform_driver ebc_c384_wdt_driver = {
+static struct isa_driver ebc_c384_wdt_driver = {
+	.probe = ebc_c384_wdt_probe,
 	.driver = {
 		.name = MODULE_NAME
 	},
 	.remove = ebc_c384_wdt_remove
 };
 
-static struct platform_device *ebc_c384_wdt_device;
-
 static int __init ebc_c384_wdt_init(void)
 {
-	int err;
-
 	if (!dmi_match(DMI_BOARD_NAME, "EBC-C384 SBC"))
 		return -ENODEV;
 
-	ebc_c384_wdt_device = platform_device_alloc(MODULE_NAME, -1);
-	if (!ebc_c384_wdt_device)
-		return -ENOMEM;
-
-	err = platform_device_add(ebc_c384_wdt_device);
-	if (err)
-		goto err_platform_device;
-
-	err = platform_driver_probe(&ebc_c384_wdt_driver, ebc_c384_wdt_probe);
-	if (err)
-		goto err_platform_driver;
-
-	return 0;
-
-err_platform_driver:
-	platform_device_del(ebc_c384_wdt_device);
-err_platform_device:
-	platform_device_put(ebc_c384_wdt_device);
-	return err;
+	return isa_register_driver(&ebc_c384_wdt_driver, 1);
 }
 
 static void __exit ebc_c384_wdt_exit(void)
 {
-	platform_device_unregister(ebc_c384_wdt_device);
-	platform_driver_unregister(&ebc_c384_wdt_driver);
+	isa_unregister_driver(&ebc_c384_wdt_driver);
 }
 
 module_init(ebc_c384_wdt_init);
@@ -185,4 +162,4 @@ module_exit(ebc_c384_wdt_exit);
 MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@...il.com>");
 MODULE_DESCRIPTION("WinSystems EBC-C384 watchdog timer driver");
 MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:" MODULE_NAME);
+MODULE_ALIAS("isa:" MODULE_NAME);
-- 
2.7.3