aboutsummaryrefslogtreecommitdiff
path: root/Documentation/i2c
diff options
context:
space:
mode:
authorJean Delvare <khali@linux-fr.org>2005-10-17 23:16:25 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2005-10-28 14:02:12 -0700
commit2445eb62e98250f1ec8cbc8cf7c4be9cfafe88e5 (patch)
treed378cbfddb05c37d09cf03c71f070b02aed7a9cc /Documentation/i2c
parentdeb875c7ff2ef417a2daff41ee4b357098b7ab10 (diff)
downloadlinux-linaro-stable-2445eb62e98250f1ec8cbc8cf7c4be9cfafe88e5.tar.gz
[PATCH] i2c: Documentation update
Update the i2c documentation: kzalloc should be used instead of kmalloc. I also fixed a couple other things nearby in writing-clients, as several past changes had never been reported there. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation/i2c')
-rw-r--r--Documentation/i2c/porting-clients2
-rw-r--r--Documentation/i2c/writing-clients16
2 files changed, 6 insertions, 12 deletions
diff --git a/Documentation/i2c/porting-clients b/Documentation/i2c/porting-clients
index 4849dfd6961c..184fac2377aa 100644
--- a/Documentation/i2c/porting-clients
+++ b/Documentation/i2c/porting-clients
@@ -82,7 +82,7 @@ Technical changes:
exit and exit_free. For i2c+isa drivers, labels should be named
ERROR0, ERROR1 and ERROR2. Don't forget to properly set err before
jumping to error labels. By the way, labels should be left-aligned.
- Use memset to fill the client and data area with 0x00.
+ Use kzalloc instead of kmalloc.
Use i2c_set_clientdata to set the client data (as opposed to
a direct access to client->data).
Use strlcpy instead of strcpy to copy the client name.
diff --git a/Documentation/i2c/writing-clients b/Documentation/i2c/writing-clients
index 1882811c7f5d..e94d9c6cc522 100644
--- a/Documentation/i2c/writing-clients
+++ b/Documentation/i2c/writing-clients
@@ -55,6 +55,7 @@ be very useful.
An example structure is below.
struct foo_data {
+ struct i2c_client client;
struct semaphore lock; /* For ISA access in `sensors' drivers. */
int sysctl_id; /* To keep the /proc directory entry for
`sensors' drivers. */
@@ -307,22 +308,15 @@ For now, you can ignore the `flags' parameter. It is there for future use.
client structure, even though we cannot fill it completely yet.
But it allows us to access several i2c functions safely */
- /* Note that we reserve some space for foo_data too. If you don't
- need it, remove it. We do it here to help to lessen memory
- fragmentation. */
- if (! (new_client = kmalloc(sizeof(struct i2c_client) +
- sizeof(struct foo_data),
- GFP_KERNEL))) {
+ if (!(data = kzalloc(sizeof(struct foo_data), GFP_KERNEL))) {
err = -ENOMEM;
goto ERROR0;
}
- /* This is tricky, but it will set the data to the right value. */
- client->data = new_client + 1;
- data = (struct foo_data *) (client->data);
+ new_client = &data->client;
+ i2c_set_clientdata(new_client, data);
new_client->addr = address;
- new_client->data = data;
new_client->adapter = adapter;
new_client->driver = &foo_driver;
new_client->flags = 0;
@@ -448,7 +442,7 @@ much simpler than the attachment code, fortunately!
release_region(client->addr,LM78_EXTENT);
/* HYBRID SENSORS CHIP ONLY END */
- kfree(client); /* Frees client data too, if allocated at the same time */
+ kfree(data);
return 0;
}