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authorGrant Likely <grant.likely@secretlab.ca>2012-02-01 19:22:22 +0100
committerGrant Likely <grant.likely@secretlab.ca>2012-02-01 22:26:30 +0100
commit07d57a32fb6eb2da017796e038682f817a4f685e (patch)
tree4c7bb83cbda8db99ed91f575d8355c5b45b16cfb /drivers
parentof: Add of_property_match_string() to find index into a string list (diff)
downloadlinux-07d57a32fb6eb2da017796e038682f817a4f685e.tar.xz
linux-07d57a32fb6eb2da017796e038682f817a4f685e.zip
drivercore: Output common devicetree information in uevent
When userspace needs to find a specific device, it currently isn't easy to resolve a /sys/devices/ path from a specific device tree node. Nor is it easy to obtain the compatible list for devices. This patch generalizes the code that inserts OF_* values into the uevent device attribute so that any device that is attached to an OF node will have that information exported to userspace. Without this patch only platform devices and some powerpc-specific busses have access to this data. The original function also creates a MODALIAS property for the compatible list, but that code has not been generalized into the common case because it has the potential to break module loading on a lot of bus types. Bus types are still responsible for their own MODALIAS properties. Boot tested on ARM and compile tested on PowerPC and SPARC. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Tobias Klauser <tklauser@distanz.ch> Cc: Frederic Lambert <frdrc66@gmail.com> Cc: Rob Herring <rob.herring@calxeda.com> Cc: Mark Brown <broonie@sirena.org.uk> Cc: "David S. Miller" <davem@davemloft.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/base/core.c5
-rw-r--r--drivers/base/platform.c2
-rw-r--r--drivers/macintosh/macio_asic.c2
-rw-r--r--drivers/of/device.c30
4 files changed, 23 insertions, 16 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 4a67cc0c8b37..28d8c21bb323 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -18,6 +18,8 @@
#include <linux/string.h>
#include <linux/kdev_t.h>
#include <linux/notifier.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/genhd.h>
#include <linux/kallsyms.h>
#include <linux/mutex.h>
@@ -267,6 +269,9 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj,
if (dev->driver)
add_uevent_var(env, "DRIVER=%s", dev->driver->name);
+ /* Add common DT information about the device */
+ of_device_uevent(dev, env);
+
/* have the bus specific function add its stuff */
if (dev->bus && dev->bus->uevent) {
retval = dev->bus->uevent(dev, env);
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index f0c605e99ade..a1a722502587 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -621,7 +621,7 @@ static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
int rc;
/* Some devices have extra OF data and an OF-style MODALIAS */
- rc = of_device_uevent(dev,env);
+ rc = of_device_uevent_modalias(dev,env);
if (rc != -ENODEV)
return rc;
diff --git a/drivers/macintosh/macio_asic.c b/drivers/macintosh/macio_asic.c
index 4daf9e5a7736..20e5c2cda430 100644
--- a/drivers/macintosh/macio_asic.c
+++ b/drivers/macintosh/macio_asic.c
@@ -137,7 +137,7 @@ extern struct device_attribute macio_dev_attrs[];
struct bus_type macio_bus_type = {
.name = "macio",
.match = macio_bus_match,
- .uevent = of_device_uevent,
+ .uevent = of_device_uevent_modalias,
.probe = macio_device_probe,
.remove = macio_device_remove,
.shutdown = macio_device_shutdown,
diff --git a/drivers/of/device.c b/drivers/of/device.c
index 62b4b32ac887..4c74e4fc5a51 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -128,39 +128,41 @@ ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
/**
* of_device_uevent - Display OF related uevent information
*/
-int of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
+void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
{
const char *compat;
int seen = 0, cplen, sl;
if ((!dev) || (!dev->of_node))
- return -ENODEV;
-
- if (add_uevent_var(env, "OF_NAME=%s", dev->of_node->name))
- return -ENOMEM;
+ return;
- if (add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type))
- return -ENOMEM;
+ add_uevent_var(env, "OF_NAME=%s", dev->of_node->name);
+ add_uevent_var(env, "OF_FULLNAME=%s", dev->of_node->full_name);
+ if (dev->of_node->type && strcmp("<NULL>", dev->of_node->type) != 0)
+ add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type);
/* Since the compatible field can contain pretty much anything
* it's not really legal to split it out with commas. We split it
* up using a number of environment variables instead. */
-
compat = of_get_property(dev->of_node, "compatible", &cplen);
while (compat && *compat && cplen > 0) {
- if (add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat))
- return -ENOMEM;
-
+ add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
sl = strlen(compat) + 1;
compat += sl;
cplen -= sl;
seen++;
}
+ add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
+}
- if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen))
- return -ENOMEM;
+int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
+{
+ int sl;
+
+ if ((!dev) || (!dev->of_node))
+ return -ENODEV;
- /* modalias is trickier, we add it in 2 steps */
+ /* Devicetree modalias is tricky, we add it in 2 steps */
if (add_uevent_var(env, "MODALIAS="))
return -ENOMEM;