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Commit 19a4fb21 authored by Sudip Mukherjee's avatar Sudip Mukherjee Committed by Greg Kroah-Hartman
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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: default avatarJean Delvare <jdelvare@suse.de>
Signed-off-by: default avatarSudip Mukherjee <sudip@vectorindia.org>
Acked-by: default avatarWolfram Sang <wsa@the-dreams.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9be83c0a

drivers/i2c/busses/i2c-parport.c

+23 −0
Original line number Diff line number Diff line
@@ -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);