aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/base/driver.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/base/driver.c')
-rw-r--r--drivers/base/driver.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index 1b645886e9eb..291c5954a3af 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -56,6 +56,41 @@ EXPORT_SYMBOL_GPL(driver_for_each_device);
56 56
57 57
58/** 58/**
59 * driver_find_device - device iterator for locating a particular device.
60 * @driver: The device's driver
61 * @start: Device to begin with
62 * @data: Data to pass to match function
63 * @match: Callback function to check device
64 *
65 * This is similar to the driver_for_each_device() function above, but
66 * it returns a reference to a device that is 'found' for later use, as
67 * determined by the @match callback.
68 *
69 * The callback should return 0 if the device doesn't match and non-zero
70 * if it does. If the callback returns non-zero, this function will
71 * return to the caller and not iterate over any more devices.
72 */
73struct device * driver_find_device(struct device_driver *drv,
74 struct device * start, void * data,
75 int (*match)(struct device *, void *))
76{
77 struct klist_iter i;
78 struct device *dev;
79
80 if (!drv)
81 return NULL;
82
83 klist_iter_init_node(&drv->klist_devices, &i,
84 (start ? &start->knode_driver : NULL));
85 while ((dev = next_device(&i)))
86 if (match(dev, data) && get_device(dev))
87 break;
88 klist_iter_exit(&i);
89 return dev;
90}
91EXPORT_SYMBOL_GPL(driver_find_device);
92
93/**
59 * driver_create_file - create sysfs file for driver. 94 * driver_create_file - create sysfs file for driver.
60 * @drv: driver. 95 * @drv: driver.
61 * @attr: driver attribute descriptor. 96 * @attr: driver attribute descriptor.