i2c-parport: define ports to connect

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.

Tested-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-parport.c b/drivers/i2c/busses/i2c-parport.c
index a1fac5aa9bae..155da957a92b 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 +166,19 @@ static void i2c_parport_irq(void *data)
 static void i2c_parport_attach(struct parport *port)
 {
         struct i2c_par *adapter;
+        int i;
+        struct pardev_cb i2c_parport_cb;
+
+        for (i = 0; i < MAX_DEVICE; i++) {
+                if (parport[i] == -1)
+                        continue;
+                if (port->number == parport[i])
+                        break;
+        }
+        if (i == MAX_DEVICE) {
+                pr_debug("i2c-parport: Not using parport%d.\n", port->number);
+                return;
+        }
 
         adapter = kzalloc(sizeof(struct i2c_par), GFP_KERNEL);
         if (adapter == NULL) {
@@ -298,5 +314,12 @@ MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
 MODULE_DESCRIPTION("I2C bus over parallel port");
 MODULE_LICENSE("GPL");
 
+module_param_array(parport, int, NULL, 0);
+MODULE_PARM_DESC(parport,
+                 "List of parallel ports to bind to, by index.\n"
+                 " Atmost " __stringify(MAX_DEVICE) " devices are supported.\n"
+                 " Default is one device connected to parport0.\n"
+);
+
 module_init(i2c_parport_init);
 module_exit(i2c_parport_exit);