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V4L/DVB (10237): pvrusb2: Generate a device-unique identifier

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Implement a new internal function to create a string device
identifier.  This ID stays with the specific device, making it useful
to user space to identify specific devices.  We use the serial number
if available; otherwise we give up and just spit out a unit/instance ID.

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mike Isely 2009-01-14 04:22:56 -03:00 committed by Mauro Carvalho Chehab
parent d166b02ea6
commit 13a887971b
3 changed files with 34 additions and 0 deletions
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12
drivers/media/video/pvrusb2/pvrusb2-hdw-internal.h
View File

@ -195,8 +195,20 @@ struct pvr2_hdw {
struct mutex big_lock_mutex;
int big_lock_held; /* For debugging */
/* This is a simple string which identifies the instance of this
driver. It is unique within the set of existing devices, but
there is no attempt to keep the name consistent with the same
physical device each time. */
char name[32];
/* This is a simple string which identifies the physical device
instance itself - if possible. (If not possible, then it is
based on the specific driver instance, similar to name above.)
The idea here is that userspace might hopefully be able to use
this recognize specific tuners. It will encode a serial number,
if available. */
char identifier[32];
/* I2C stuff */
struct i2c_adapter i2c_adap;
struct i2c_algorithm i2c_algo;

19
drivers/media/video/pvrusb2/pvrusb2-hdw.c
View File

@ -1283,6 +1283,12 @@ const char *pvr2_hdw_get_bus_info(struct pvr2_hdw *hdw)
}
const char *pvr2_hdw_get_device_identifier(struct pvr2_hdw *hdw)
{
return hdw->identifier;
}
unsigned long pvr2_hdw_get_cur_freq(struct pvr2_hdw *hdw)
{
return hdw->freqSelector ? hdw->freqValTelevision : hdw->freqValRadio;
@ -2024,6 +2030,19 @@ static void pvr2_hdw_setup_low(struct pvr2_hdw *hdw)
hdw->std_mask_eeprom = V4L2_STD_ALL;
}
if (hdw->serial_number) {
idx = scnprintf(hdw->identifier, sizeof(hdw->identifier) - 1,
"sn-%lu", hdw->serial_number);
} else if (hdw->unit_number >= 0) {
idx = scnprintf(hdw->identifier, sizeof(hdw->identifier) - 1,
"unit-%c",
hdw->unit_number + 'a');
} else {
idx = scnprintf(hdw->identifier, sizeof(hdw->identifier) - 1,
"unit-??");
}
hdw->identifier[idx] = 0;
pvr2_hdw_setup_std(hdw);
if (!get_default_tuner_type(hdw)) {

3
drivers/media/video/pvrusb2/pvrusb2-hdw.h
View File

@ -132,6 +132,9 @@ unsigned long pvr2_hdw_get_sn(struct pvr2_hdw *);
/* Retrieve bus location info of device */
const char *pvr2_hdw_get_bus_info(struct pvr2_hdw *);
/* Retrieve per-instance string identifier for this specific device */
const char *pvr2_hdw_get_device_identifier(struct pvr2_hdw *);
/* Called when hardware has been unplugged */
void pvr2_hdw_disconnect(struct pvr2_hdw *);