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authorMark M. Hoffman <mhoffman@lightlink.com>2006-03-23 16:50:25 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2006-04-14 11:18:34 -0700
commite97b81ddbb8b8c72b85330ac4a454a4513dcba8a (patch)
treeb7be59895ee5cafdd5af5b4237f5b96b2812b180 /drivers/i2c
parent3cb8e1a92ef7588d3acdecf493ddddd0dd71a709 (diff)
downloadop-kernel-dev-e97b81ddbb8b8c72b85330ac4a454a4513dcba8a.zip
op-kernel-dev-e97b81ddbb8b8c72b85330ac4a454a4513dcba8a.tar.gz
[PATCH] i2c-parport: Make type parameter mandatory
This patch forces the user to specify what type of adapter is present when loading i2c-parport or i2c-parport-light. If none is specified, the driver init simply fails - instead of assuming adapter type 0. This alleviates the sometimes lengthy boot time delays which can be caused by accidentally building one of these into a kernel along with several i2c slave drivers that have lengthy probe routines (e.g. hwmon drivers). Kconfig and documentation updated accordingly. Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com> Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/Kconfig5
-rw-r--r--drivers/i2c/busses/i2c-parport-light.c9
-rw-r--r--drivers/i2c/busses/i2c-parport.c9
-rw-r--r--drivers/i2c/busses/i2c-parport.h2
4 files changed, 19 insertions, 6 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 089c6f5..d6d4494 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -286,7 +286,10 @@ config I2C_PARPORT
This driver is a replacement for (and was inspired by) an older
driver named i2c-philips-par. The new driver supports more devices,
and makes it easier to add support for new devices.
-
+
+ An adapter type parameter is now mandatory. Please read the file
+ Documentation/i2c/busses/i2c-parport for details.
+
Another driver exists, named i2c-parport-light, which doesn't depend
on the parport driver. This is meant for embedded systems. Don't say
Y here if you intend to say Y or M there.
diff --git a/drivers/i2c/busses/i2c-parport-light.c b/drivers/i2c/busses/i2c-parport-light.c
index c63025a..e09ebbb 100644
--- a/drivers/i2c/busses/i2c-parport-light.c
+++ b/drivers/i2c/busses/i2c-parport-light.c
@@ -121,9 +121,14 @@ static struct i2c_adapter parport_adapter = {
static int __init i2c_parport_init(void)
{
- if (type < 0 || type >= ARRAY_SIZE(adapter_parm)) {
+ if (type < 0) {
+ printk(KERN_WARNING "i2c-parport: adapter type unspecified\n");
+ return -ENODEV;
+ }
+
+ if (type >= ARRAY_SIZE(adapter_parm)) {
printk(KERN_WARNING "i2c-parport: invalid type (%d)\n", type);
- type = 0;
+ return -ENODEV;
}
if (base == 0) {
diff --git a/drivers/i2c/busses/i2c-parport.c b/drivers/i2c/busses/i2c-parport.c
index 7e2e8cd..934bd55 100644
--- a/drivers/i2c/busses/i2c-parport.c
+++ b/drivers/i2c/busses/i2c-parport.c
@@ -241,9 +241,14 @@ static struct parport_driver i2c_parport_driver = {
static int __init i2c_parport_init(void)
{
- if (type < 0 || type >= ARRAY_SIZE(adapter_parm)) {
+ if (type < 0) {
+ printk(KERN_WARNING "i2c-parport: adapter type unspecified\n");
+ return -ENODEV;
+ }
+
+ if (type >= ARRAY_SIZE(adapter_parm)) {
printk(KERN_WARNING "i2c-parport: invalid type (%d)\n", type);
- type = 0;
+ return -ENODEV;
}
return parport_register_driver(&i2c_parport_driver);
diff --git a/drivers/i2c/busses/i2c-parport.h b/drivers/i2c/busses/i2c-parport.h
index d702e5e..9ddd816 100644
--- a/drivers/i2c/busses/i2c-parport.h
+++ b/drivers/i2c/busses/i2c-parport.h
@@ -90,7 +90,7 @@ static struct adapter_parm adapter_parm[] = {
},
};
-static int type;
+static int type = -1;
module_param(type, int, 0);
MODULE_PARM_DESC(type,
"Type of adapter:\n"
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