From e97b81ddbb8b8c72b85330ac4a454a4513dcba8a Mon Sep 17 00:00:00 2001 From: "Mark M. Hoffman" Date: Thu, 23 Mar 2006 16:50:25 +0100 Subject: [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 Signed-off-by: Jean Delvare Signed-off-by: Greg Kroah-Hartman --- drivers/i2c/busses/Kconfig | 5 ++++- drivers/i2c/busses/i2c-parport-light.c | 9 +++++++-- drivers/i2c/busses/i2c-parport.c | 9 +++++++-- drivers/i2c/busses/i2c-parport.h | 2 +- 4 files changed, 19 insertions(+), 6 deletions(-) (limited to 'drivers/i2c') diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 089c6f5b24d..d6d44946a28 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 c63025a4c86..e09ebbb2f9f 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 7e2e8cd1c14..934bd55bae1 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 d702e5e0388..9ddd816d5d0 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" -- cgit v1.2.3