linux-kernel - [PATCH 2/6] mfd: ab8500-core: Make it explicitly non-modular

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Date:   Sat, 29 Oct 2016 21:24:36 -0400
From:   Paul Gortmaker <paul.gortmaker@...driver.com>
To:     <linux-kernel@...r.kernel.org>
CC:     Paul Gortmaker <paul.gortmaker@...driver.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Samuel Ortiz <sameo@...ux.intel.com>,
        Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 2/6] mfd: ab8500-core: Make it explicitly non-modular

The Kconfig currently controlling compilation of this code is:

drivers/mfd/Kconfig:config AB8500_CORE
drivers/mfd/Kconfig:    bool "ST-Ericsson AB8500 Mixed Signal Power Management chip"

...meaning that it currently is not being built as a module by anyone.

Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.

We explicitly disallow a driver unbind, since that doesn't have a
sensible use case anyway, and it allows us to drop the ".remove"
code for non-modular drivers.

Since module_init was not in use by this code, the init ordering
remains unchanged with this commit.

We replace module.h with moduleparam.h ; the latter since this file
was implicitly relying on getting it.

We also delete the MODULE_LICENSE tag etc. since all that information
is already contained at the top of the file in the comments.

Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Samuel Ortiz <sameo@...ux.intel.com>
Cc: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 drivers/mfd/ab8500-core.c | 37 ++++++-------------------------------
 1 file changed, 6 insertions(+), 31 deletions(-)

diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c
index 589eebfc13df..6e00124cef01 100644
--- a/drivers/mfd/ab8500-core.c
+++ b/drivers/mfd/ab8500-core.c
@@ -14,7 +14,7 @@
 #include <linux/irqdomain.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
-#include <linux/module.h>
+#include <linux/moduleparam.h>
 #include <linux/platform_device.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/abx500.h>
@@ -123,6 +123,10 @@ static DEFINE_SPINLOCK(on_stat_lock);
 static u8 turn_on_stat_mask = 0xFF;
 static u8 turn_on_stat_set;
 static bool no_bm; /* No battery management */
+/*
+ * not really modular, but the easiest way to keep compat with existing
+ * bootargs behaviour is to continue using module_param here.
+ */
 module_param(no_bm, bool, S_IRUGO);
 
 #define AB9540_MODEM_CTRL2_REG			0x23
@@ -1324,25 +1328,6 @@ static int ab8500_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int ab8500_remove(struct platform_device *pdev)
-{
-	struct ab8500 *ab8500 = platform_get_drvdata(pdev);
-
-	if (((is_ab8505(ab8500) || is_ab9540(ab8500)) &&
-			ab8500->chip_id >= AB8500_CUT2P0) || is_ab8540(ab8500))
-		sysfs_remove_group(&ab8500->dev->kobj, &ab9540_attr_group);
-	else
-		sysfs_remove_group(&ab8500->dev->kobj, &ab8500_attr_group);
-
-	if ((is_ab8505(ab8500) || is_ab9540(ab8500)) &&
-			ab8500->chip_id >= AB8500_CUT2P0)
-		sysfs_remove_group(&ab8500->dev->kobj, &ab8505_attr_group);
-
-	mfd_remove_devices(ab8500->dev);
-
-	return 0;
-}
-
 static const struct platform_device_id ab8500_id[] = {
 	{ "ab8500-core", AB8500_VERSION_AB8500 },
 	{ "ab8505-i2c", AB8500_VERSION_AB8505 },
@@ -1354,9 +1339,9 @@ static const struct platform_device_id ab8500_id[] = {
 static struct platform_driver ab8500_core_driver = {
 	.driver = {
 		.name = "ab8500-core",
+		.suppress_bind_attrs = true,
 	},
 	.probe	= ab8500_probe,
-	.remove	= ab8500_remove,
 	.id_table = ab8500_id,
 };
 
@@ -1364,14 +1349,4 @@ static int __init ab8500_core_init(void)
 {
 	return platform_driver_register(&ab8500_core_driver);
 }
-
-static void __exit ab8500_core_exit(void)
-{
-	platform_driver_unregister(&ab8500_core_driver);
-}
 core_initcall(ab8500_core_init);
-module_exit(ab8500_core_exit);
-
-MODULE_AUTHOR("Mattias Wallin, Srinidhi Kasagar, Rabin Vincent");
-MODULE_DESCRIPTION("AB8500 MFD core");
-MODULE_LICENSE("GPL v2");
-- 
2.10.1