[PATCH v5 WIP 3/5] i2c-parport: define ports to connect

[Sudip Mukherjee <sudipm.mukherjee@gmail.com>]

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 <sudip@vectorindia.org>
---
 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 <jdelvare@suse.de>");
 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