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Subject[PATCH] 2.5.31 driverfs: patch for your consideration
Here's the patch as we discussed.

diff -ur --new-file a/drivers/base/interface.c b/drivers/base/interface.c
--- a/drivers/base/interface.c Wed Aug 14 17:09:28 2002
+++ b/drivers/base/interface.c Fri Aug 16 22:03:18 2002
@@ -88,8 +88,20 @@
static DEVICE_ATTR(power,"power",S_IWUSR | S_IRUGO,
device_read_power,device_write_power);

+
+static ssize_t device_read_driver(struct device * dev, char * buf,
size_t count, loff_t off)
+{
+ if (dev->driver)
+ return off ? 0 : sprintf(buf,"%s\n",dev->driver->name);
+ else
+ return 0;
+}
+
+static DEVICE_ATTR(driver,"driver",S_IRUGO,device_read_driver,NULL);
+
struct device_attribute * device_default_files[] = {
&dev_attr_name,
&dev_attr_power,
+ &dev_attr_driver,
NULL,
};




Also if You're interested here's the write support for "driver".

diff -ur --new-file a/drivers/base/base.h b/drivers/base/base.h
--- a/drivers/base/base.h Fri Aug 16 12:20:18 2002
+++ b/drivers/base/base.h Fri Aug 16 22:17:26 2002
@@ -26,3 +26,5 @@

extern int driver_attach(struct device_driver * drv);
extern void driver_detach(struct device_driver * drv);
+extern int do_driver_detach(struct device * dev, struct device_driver *
drv);
+extern int do_driver_attach(struct device * dev, void * data);
diff -ur --new-file a/drivers/base/core.c b/drivers/base/core.c
--- a/drivers/base/core.c Wed Aug 14 17:09:28 2002
+++ b/drivers/base/core.c Fri Aug 16 22:16:30 2002
@@ -98,7 +98,7 @@

static void device_detach(struct device * dev)
{
- struct device_driver * drv;
+ struct device_driver * drv;

if (dev->driver) {
lock_device(dev);
@@ -117,7 +117,7 @@
}
}

-static int do_driver_attach(struct device * dev, void * data)
+int do_driver_attach(struct device * dev, void * data)
{
struct device_driver * drv = (struct device_driver *)data;
int error = 0;
@@ -134,7 +134,7 @@
return bus_for_each_dev(drv->bus,drv,do_driver_attach);
}

-static int do_driver_detach(struct device * dev, struct device_driver *
drv)
+int do_driver_detach(struct device * dev, struct device_driver * drv)
{
lock_device(dev);
if (dev->driver == drv) {
diff -ur --new-file a/drivers/base/interface.c b/drivers/base/interface.c
--- a/drivers/base/interface.c Fri Aug 16 22:06:41 2002
+++ b/drivers/base/interface.c Fri Aug 16 22:15:29 2002
@@ -8,6 +8,7 @@
#include <linux/device.h>
#include <linux/err.h>
#include <linux/stat.h>
+#include "base.h"

static ssize_t device_read_name(struct device * dev, char * buf, size_t
count, loff_t off)
{
@@ -97,7 +98,44 @@
return 0;
}

-static DEVICE_ATTR(driver,"driver",S_IRUGO,device_read_driver,NULL);
+struct device_driver * find_driver_by_name(struct bus_type * bus, char
* name)
+{
+ struct list_head * pos;
+ struct device_driver * drv;
+ list_for_each (pos, &bus->drivers)
+ {
+ drv = list_entry(pos, struct device_driver, bus_list);
+ if (!strncmp(drv->name,name,strlen(name) - 1))
+ return drv;
+
+ }
+ return NULL;
+
+}
+
+static ssize_t device_write_driver(struct device * dev, char * buf,
size_t count, loff_t off)
+{
+ struct device_driver * drv = NULL;
+ int error = 0;
+ if (off)
+ return 0;
+ if (!dev->bus)
+ return count;
+ if (!dev->driver)
+ {
+ drv = find_driver_by_name(dev->bus, buf);
+ if (drv)
+ error = do_driver_attach(dev,drv);
+
+ } else if (!strnicmp(buf,"remove",6))
+ {
+ error = do_driver_detach(dev, dev->driver);
+ }
+ return error < 0 ? error : count;
+}
+
+static DEVICE_ATTR(driver,"driver",S_IWUSR | S_IRUGO,
+ device_read_driver,device_write_driver);

struct device_attribute * device_default_files[] = {
&dev_attr_name,


I look forward to hearing from you.

Thanks,
Adam

PS: Would you be interested in a patch that would port the pnpbios
driver to the driver model?

-
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