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| author | Sudip Mukherjee <sudipm.mukherjee@gmail.com> | 2015-05-20 17:26:59 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-06-01 00:08:19 +0200 |
| commit | 19a4fb21f804dbd5a327eba7a1569b6b8e941a54 (patch) | |
| tree | c29861ee269636bd3cca2321152119c72c9719b1 /drivers/i2c | |
| parent | staging: panel: use new parport device model (diff) | |
| download | linux-19a4fb21f804dbd5a327eba7a1569b6b8e941a54.tar.xz linux-19a4fb21f804dbd5a327eba7a1569b6b8e941a54.zip | |
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>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-parport.c | 23 |
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); |