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path: root/drivers/base/platform.c
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Diffstat (limited to 'drivers/base/platform.c')
-rw-r--r--drivers/base/platform.c80
1 files changed, 70 insertions, 10 deletions
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index f80aaaf9f..1dd6d3bf1 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -513,7 +513,7 @@ static int platform_drv_probe(struct device *_dev)
return ret;
ret = dev_pm_domain_attach(_dev, true);
- if (ret != -EPROBE_DEFER) {
+ if (ret != -EPROBE_DEFER && drv->probe) {
ret = drv->probe(dev);
if (ret)
dev_pm_domain_detach(_dev, true);
@@ -536,9 +536,10 @@ static int platform_drv_remove(struct device *_dev)
{
struct platform_driver *drv = to_platform_driver(_dev->driver);
struct platform_device *dev = to_platform_device(_dev);
- int ret;
+ int ret = 0;
- ret = drv->remove(dev);
+ if (drv->remove)
+ ret = drv->remove(dev);
dev_pm_domain_detach(_dev, true);
return ret;
@@ -549,7 +550,8 @@ static void platform_drv_shutdown(struct device *_dev)
struct platform_driver *drv = to_platform_driver(_dev->driver);
struct platform_device *dev = to_platform_device(_dev);
- drv->shutdown(dev);
+ if (drv->shutdown)
+ drv->shutdown(dev);
dev_pm_domain_detach(_dev, true);
}
@@ -563,12 +565,9 @@ int __platform_driver_register(struct platform_driver *drv,
{
drv->driver.owner = owner;
drv->driver.bus = &platform_bus_type;
- if (drv->probe)
- drv->driver.probe = platform_drv_probe;
- if (drv->remove)
- drv->driver.remove = platform_drv_remove;
- if (drv->shutdown)
- drv->driver.shutdown = platform_drv_shutdown;
+ drv->driver.probe = platform_drv_probe;
+ drv->driver.remove = platform_drv_remove;
+ drv->driver.shutdown = platform_drv_shutdown;
return driver_register(&drv->driver);
}
@@ -711,6 +710,67 @@ err_out:
}
EXPORT_SYMBOL_GPL(__platform_create_bundle);
+/**
+ * __platform_register_drivers - register an array of platform drivers
+ * @drivers: an array of drivers to register
+ * @count: the number of drivers to register
+ * @owner: module owning the drivers
+ *
+ * Registers platform drivers specified by an array. On failure to register a
+ * driver, all previously registered drivers will be unregistered. Callers of
+ * this API should use platform_unregister_drivers() to unregister drivers in
+ * the reverse order.
+ *
+ * Returns: 0 on success or a negative error code on failure.
+ */
+int __platform_register_drivers(struct platform_driver * const *drivers,
+ unsigned int count, struct module *owner)
+{
+ unsigned int i;
+ int err;
+
+ for (i = 0; i < count; i++) {
+ pr_debug("registering platform driver %ps\n", drivers[i]);
+
+ err = __platform_driver_register(drivers[i], owner);
+ if (err < 0) {
+ pr_err("failed to register platform driver %ps: %d\n",
+ drivers[i], err);
+ goto error;
+ }
+ }
+
+ return 0;
+
+error:
+ while (i--) {
+ pr_debug("unregistering platform driver %ps\n", drivers[i]);
+ platform_driver_unregister(drivers[i]);
+ }
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(__platform_register_drivers);
+
+/**
+ * platform_unregister_drivers - unregister an array of platform drivers
+ * @drivers: an array of drivers to unregister
+ * @count: the number of drivers to unregister
+ *
+ * Unegisters platform drivers specified by an array. This is typically used
+ * to complement an earlier call to platform_register_drivers(). Drivers are
+ * unregistered in the reverse order in which they were registered.
+ */
+void platform_unregister_drivers(struct platform_driver * const *drivers,
+ unsigned int count)
+{
+ while (count--) {
+ pr_debug("unregistering platform driver %ps\n", drivers[count]);
+ platform_driver_unregister(drivers[count]);
+ }
+}
+EXPORT_SYMBOL_GPL(platform_unregister_drivers);
+
/* modalias support enables more hands-off userspace setup:
* (a) environment variable lets new-style hotplug events work once system is
* fully running: "modprobe $MODALIAS"