X-Git-Url: https://git.stricted.de/?a=blobdiff_plain;f=drivers%2Fbase%2Fplatform.c;h=2b8755db76c6e65f48b7784cb463d6a213238453;hb=a8c4c20dfa8b28a3c99e33c639d9c2ea5657741e;hp=0f81731bdfa8122aeccfc439907533cfd3fc98ba;hpb=ed03f430cdc8c802652467e9097606fedc2c7abc;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 0f81731bdfa8..2b8755db76c6 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -61,7 +61,7 @@ int platform_get_irq(struct platform_device *dev, unsigned int num)
 {
 	struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
 
-	return r ? r->start : 0;
+	return r ? r->start : -ENXIO;
 }
 EXPORT_SYMBOL_GPL(platform_get_irq);
 
@@ -98,7 +98,7 @@ int platform_get_irq_byname(struct platform_device *dev, char *name)
 {
 	struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
 
-	return r ? r->start : 0;
+	return r ? r->start : -ENXIO;
 }
 EXPORT_SYMBOL_GPL(platform_get_irq_byname);
 
@@ -275,7 +275,7 @@ int platform_device_add(struct platform_device *pdev)
 	pr_debug("Registering platform device '%s'. Parent at %s\n",
 		 pdev->dev.bus_id, pdev->dev.parent->bus_id);
 
-	ret = device_register(&pdev->dev);
+	ret = device_add(&pdev->dev);
 	if (ret == 0)
 		return ret;
 
@@ -326,8 +326,8 @@ EXPORT_SYMBOL_GPL(platform_device_register);
  *	platform_device_unregister - unregister a platform-level device
  *	@pdev:	platform device we're unregistering
  *
- *	Unregistration is done in 2 steps. Fisrt we release all resources
- *	and remove it from the sybsystem, then we drop reference count by
+ *	Unregistration is done in 2 steps. First we release all resources
+ *	and remove it from the subsystem, then we drop reference count by
  *	calling platform_device_put().
  */
 void platform_device_unregister(struct platform_device * pdev)
@@ -452,6 +452,37 @@ void platform_driver_unregister(struct platform_driver *drv)
 EXPORT_SYMBOL_GPL(platform_driver_unregister);
 
 
+/* modalias support enables more hands-off userspace setup:
+ * (a) environment variable lets new-style hotplug events work once system is
+ *     fully running:  "modprobe $MODALIAS"
+ * (b) sysfs attribute lets new-style coldplug recover from hotplug events
+ *     mishandled before system is fully running:  "modprobe $(cat modalias)"
+ */
+static ssize_t
+modalias_show(struct device *dev, struct device_attribute *a, char *buf)
+{
+	struct platform_device	*pdev = to_platform_device(dev);
+	int len = snprintf(buf, PAGE_SIZE, "%s\n", pdev->name);
+
+	return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
+}
+
+static struct device_attribute platform_dev_attrs[] = {
+	__ATTR_RO(modalias),
+	__ATTR_NULL,
+};
+
+static int platform_uevent(struct device *dev, char **envp, int num_envp,
+		char *buffer, int buffer_size)
+{
+	struct platform_device	*pdev = to_platform_device(dev);
+
+	envp[0] = buffer;
+	snprintf(buffer, buffer_size, "MODALIAS=%s", pdev->name);
+	return 0;
+}
+
+
 /**
  *	platform_match - bind platform device to platform driver.
  *	@dev:	device.
@@ -496,7 +527,9 @@ static int platform_resume(struct device * dev)
 
 struct bus_type platform_bus_type = {
 	.name		= "platform",
+	.dev_attrs	= platform_dev_attrs,
 	.match		= platform_match,
+	.uevent		= platform_uevent,
 	.suspend	= platform_suspend,
 	.resume		= platform_resume,
 };