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i2c-parport: define ports to connect

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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>
This commit is contained in:
Sudip Mukherjee 2015-05-20 20:56:59 +05:30 committed by Greg Kroah-Hartman
parent 9be83c0a44
commit 19a4fb21f8
1 changed files with 23 additions and 0 deletions
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23
drivers/i2c/busses/i2c-parport.c
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@ -46,6 +46,9 @@ struct i2c_par {
static LIST_HEAD(adapter_list); static LIST_HEAD(adapter_list);
static DEFINE_MUTEX(adapter_list_lock); static DEFINE_MUTEX(adapter_list_lock);
#define MAX_DEVICE 4
static int parport[MAX_DEVICE] = {0, -1, -1, -1};
/* ----- Low-level parallel port access ----------------------------------- */ /* ----- Low-level parallel port access ----------------------------------- */
@ -163,6 +166,19 @@ static void i2c_parport_irq(void *data)
static void i2c_parport_attach(struct parport *port) static void i2c_parport_attach(struct parport *port)
{ {
struct i2c_par *adapter; 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); adapter = kzalloc(sizeof(struct i2c_par), GFP_KERNEL);
if (adapter == NULL) { if (adapter == NULL) {
@ -298,5 +314,12 @@ MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("I2C bus over parallel port"); MODULE_DESCRIPTION("I2C bus over parallel port");
MODULE_LICENSE("GPL"); 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_init(i2c_parport_init);
module_exit(i2c_parport_exit); module_exit(i2c_parport_exit);