as of now i2c-parport was connecting to all the available parallel ports. Lets limit that to maximum of 4 instances and at the same time define which instance connects to which parallel port
Signed-off-by: Sudip Mukherjee <[email protected]> --- drivers/i2c/busses/i2c-parport.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/drivers/i2c/busses/i2c-parport.c b/drivers/i2c/busses/i2c-parport.c index a1fac5a..a9b25c3 100644 --- a/drivers/i2c/busses/i2c-parport.c +++ b/drivers/i2c/busses/i2c-parport.c @@ -46,6 +46,9 @@ struct i2c_par { static LIST_HEAD(adapter_list); static DEFINE_MUTEX(adapter_list_lock); +#define MAX_DEVICE 4 +static int parport[MAX_DEVICE] = {0, -1, -1, -1}; + /* ----- Low-level parallel port access ----------------------------------- */ @@ -163,6 +166,18 @@ static void i2c_parport_irq(void *data) static void i2c_parport_attach(struct parport *port) { struct i2c_par *adapter; + int i; + + for (i = 0; i < MAX_DEVICE; i++) { + if (parport[i] == -1) + continue; + if (port->number == parport[i]) + break; + } + if (i == MAX_DEVICE) { + pr_err("port mentioned not found\n"); + return; + } adapter = kzalloc(sizeof(struct i2c_par), GFP_KERNEL); if (adapter == NULL) { @@ -298,5 +313,11 @@ MODULE_AUTHOR("Jean Delvare <[email protected]>"); MODULE_DESCRIPTION("I2C bus over parallel port"); MODULE_LICENSE("GPL"); +module_param_array(parport, int, NULL, 0); +MODULE_PARM_DESC(parport, "Atmost 4 instances are allowed.\n" + "Mention portnumbers in array.\n" + "If the port is not to be used mention -1.\n" + "Default is one instance connected to parport0\n"); + module_init(i2c_parport_init); module_exit(i2c_parport_exit); -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
