linux-kernel - [PATCH 1/2] component: Make a "match_add all devices matching my drivers" helper.

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Date:	Mon, 28 Sep 2015 16:54:08 -0700
From:	Eric Anholt <eric@...olt.net>
To:	dri-devel@...ts.freedesktop.org
Cc:	linux-kernel@...r.kernel.org, David Airlie <airlied@...ux.ie>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Inki Dae <inki.dae@...sung.com>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Seung-Woo Kim <sw0312.kim@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Eric Anholt <eric@...olt.net>
Subject: [PATCH 1/2] component: Make a "match_add all devices matching my drivers" helper.

The body of the loop is taken from the exynos driver.  It appears to
also be useful in msm, and I've used it in vc4.

Signed-off-by: Eric Anholt <eric@...olt.net>
---

This is separated from converting exynos to use it, to let it land
separately and not have to sync between trees.

 drivers/base/component.c  | 40 ++++++++++++++++++++++++++++++++++++++++
 include/linux/component.h |  5 +++++
 2 files changed, 45 insertions(+)

diff --git a/drivers/base/component.c b/drivers/base/component.c
index f748430..08167a3 100644
--- a/drivers/base/component.c
+++ b/drivers/base/component.c
@@ -16,6 +16,7 @@
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/platform_device.h>
 #include <linux/slab.h>
 
 struct component_match {
@@ -283,6 +284,45 @@ void component_match_add(struct device *dev, struct component_match **matchptr,
 }
 EXPORT_SYMBOL(component_match_add);
 
+static int compare_dev(struct device *dev, void *data)
+{
+	return dev == (struct device *)data;
+}
+
+/**
+ * component_match_add_platform_drivers - For each driver passed in,
+ * finds each device that probed with it and adds it as a component
+ * driver to the match list.
+ * @dev:     master device for the components
+ * @match:   pointer to the match structure pointer.  For the first
+ *           component_match_add(), this should be a pointer to a NULL
+ *           pointer, which will get filled in by the call.
+ * @drivers: array of platform drivers whose devices should all be
+ *           added to the match
+ * @count:   number of platform drivers to match
+ */
+void component_match_add_platform_drivers(struct device *dev,
+					  struct component_match **match,
+					  struct platform_driver *const *drivers,
+					  int count)
+{
+	int i;
+
+	for (i = 0; i < count; i++) {
+		struct device_driver *drv = &drivers[i]->driver;
+		struct device *p = NULL, *d;
+
+		while ((d = bus_find_device(&platform_bus_type, p, drv,
+					    (void *)platform_bus_type.match))) {
+			put_device(p);
+			component_match_add(dev, match, compare_dev, d);
+			p = d;
+		}
+		put_device(p);
+	}
+}
+EXPORT_SYMBOL_GPL(component_match_add_platform_drivers);
+
 int component_master_add_with_match(struct device *dev,
 	const struct component_master_ops *ops,
 	struct component_match *match)
diff --git a/include/linux/component.h b/include/linux/component.h
index c00dcc3..2d74420 100644
--- a/include/linux/component.h
+++ b/include/linux/component.h
@@ -2,6 +2,7 @@
 #define COMPONENT_H
 
 struct device;
+struct platform_driver;
 
 struct component_ops {
 	int (*bind)(struct device *, struct device *, void *);
@@ -35,5 +36,9 @@ int component_master_add_with_match(struct device *,
 	const struct component_master_ops *, struct component_match *);
 void component_match_add(struct device *, struct component_match **,
 	int (*compare)(struct device *, void *), void *compare_data);
+void component_match_add_platform_drivers(struct device *dev,
+					  struct component_match **match,
+					  struct platform_driver *const *drivers,
+					  int count);
 
 #endif
-- 
2.1.4

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