Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

[linux-2.6-block.git] / drivers / i2c / i2c-core.c

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 679a31fcb6d6f4c4cd3e96860ec87c82f2ebacc2..82576aaccc909b833a88d96f4eb2b18414a7b38c 100644 (file)
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -111,6 +111,8 @@ struct i2c_acpi_lookup {
        acpi_handle adapter_handle;
        acpi_handle device_handle;
        acpi_handle search_handle;
+       int n;
+       int index;
        u32 speed;
        u32 min_speed;
 };
@@ -129,6 +131,9 @@ static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data)
        if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C)
                return 1;
 
+       if (lookup->index != -1 && lookup->n++ != lookup->index)
+               return 1;
+
        status = acpi_get_handle(lookup->device_handle,
                                 sb->resource_source.string_ptr,
                                 &lookup->adapter_handle);
@@ -181,6 +186,7 @@ static int i2c_acpi_get_info(struct acpi_device *adev,
 
        memset(&lookup, 0, sizeof(lookup));
        lookup.info = info;
+       lookup.index = -1;
 
        ret = i2c_acpi_do_lookup(adev, &lookup);
        if (ret)
@@ -327,6 +333,7 @@ u32 i2c_acpi_find_bus_speed(struct device *dev)
        lookup.search_handle = ACPI_HANDLE(dev);
        lookup.min_speed = UINT_MAX;
        lookup.info = &dummy;
+       lookup.index = -1;
 
        status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
                                     I2C_ACPI_MAX_SCAN_DEPTH,
@@ -413,6 +420,55 @@ static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value,
 static struct notifier_block i2c_acpi_notifier = {
        .notifier_call = i2c_acpi_notify,
 };
+
+/**
+ * i2c_acpi_new_device - Create i2c-client for the Nth I2cSerialBus resource
+ * @dev:     Device owning the ACPI resources to get the client from
+ * @index:   Index of ACPI resource to get
+ * @info:    describes the I2C device; note this is modified (addr gets set)
+ * Context: can sleep
+ *
+ * By default the i2c subsys creates an i2c-client for the first I2cSerialBus
+ * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus
+ * resources, in that case this function can be used to create an i2c-client
+ * for other I2cSerialBus resources in the Current Resource Settings table.
+ *
+ * Also see i2c_new_device, which this function calls to create the i2c-client.
+ *
+ * Returns a pointer to the new i2c-client, or NULL if the adapter is not found.
+ */
+struct i2c_client *i2c_acpi_new_device(struct device *dev, int index,
+                                      struct i2c_board_info *info)
+{
+       struct i2c_acpi_lookup lookup;
+       struct i2c_adapter *adapter;
+       struct acpi_device *adev;
+       LIST_HEAD(resource_list);
+       int ret;
+
+       adev = ACPI_COMPANION(dev);
+       if (!adev)
+               return NULL;
+
+       memset(&lookup, 0, sizeof(lookup));
+       lookup.info = info;
+       lookup.device_handle = acpi_device_handle(adev);
+       lookup.index = index;
+
+       ret = acpi_dev_get_resources(adev, &resource_list,
+                                    i2c_acpi_fill_info, &lookup);
+       acpi_dev_free_resource_list(&resource_list);
+
+       if (ret < 0 || !info->addr)
+               return NULL;
+
+       adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle);
+       if (!adapter)
+               return NULL;
+
+       return i2c_new_device(adapter, info);
+}
+EXPORT_SYMBOL_GPL(i2c_acpi_new_device);
 #else /* CONFIG_ACPI */
 static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { }
 extern struct notifier_block i2c_acpi_notifier;
@@ -928,7 +984,9 @@ static int i2c_device_probe(struct device *dev)
        if (!client)
                return 0;
 
-       if (!client->irq) {
+       driver = to_i2c_driver(dev->driver);
+
+       if (!client->irq && !driver->disable_i2c_core_irq_mapping) {
                int irq = -ENOENT;
 
                if (client->flags & I2C_CLIENT_HOST_NOTIFY) {
@@ -950,8 +1008,6 @@ static int i2c_device_probe(struct device *dev)
                client->irq = irq;
        }
 
-       driver = to_i2c_driver(dev->driver);
-
        /*
         * An I2C ID table is not mandatory, if and only if, a suitable Device
         * Tree match table entry is supplied for the probing device.