On Fri, Sep 28, 2012 at 03:40:32PM +0800, Zhang Rui wrote:
> +acpi_status __init i2c_enumerate_slave(acpi_handle handle, u32 level,
> +                                    void *data, void **return_value)
> +{
> +     int result;
> +     acpi_status status;
> +     struct acpi_buffer buffer;
> +     struct acpi_resource *resource;
> +     struct acpi_resource_gpio *gpio;
> +     struct acpi_resource_i2c_serialbus *i2c;
> +     int i;
> +     struct acpi_i2c_root *root = data;
> +     struct i2c_board_info info;
> +     struct acpi_device *device;
> +
> +     if (acpi_bus_get_device(handle, &device))
> +             return AE_OK;
> +
> +     status = acpi_get_current_resources(handle, &buffer);
> +     if (ACPI_FAILURE(status)) {
> +             dev_err(&device->dev, "Failed to get ACPI resources\n");
> +             return AE_OK;
> +     }
> +
> +     for (i = 0; i < buffer.length; i += sizeof(struct acpi_resource)) {
> +             resource = (struct acpi_resource *)(buffer.pointer + i);
> +
> +             switch (resource->type) {
> +             case ACPI_RESOURCE_TYPE_GPIO:
> +                     gpio = &resource->data.gpio;
> +
> +                     if (gpio->connection_type == 
> ACPI_RESOURCE_GPIO_TYPE_INT) {
> +                             result =
> +                                 acpi_device_get_gpio_irq
> +                                 (gpio->resource_source.string_ptr,
> +                                  gpio->pin_table[0], &info.irq);

acpi_device_get_gpio_irq() is not defined in this patch series?

Also you need to do the gpio_request()/gpio_to_irq() things somewhere. Are
they handled in acpi_device_get_gpio_irq()?

How about GpioIo resources?

> +                             if (result)
> +                                     dev_err(&device->dev,
> +                                             "Failed to get IRQ\n");
> +                     }
> +                     break;
> +             case ACPI_RESOURCE_TYPE_SERIAL_BUS:
> +                     i2c = &resource->data.i2c_serial_bus;
> +
> +                     info.addr = i2c->slave_address;
> +                     break;
> +             default:
> +                     break;
> +             }
> +     }
> +
> +     add_slave(root, &info);
> +
> +     kfree(buffer.pointer);
> +     return AE_OK;
> +}
> +
> +static int __devinit acpi_i2c_root_add(struct acpi_device *device)
> +{
> +     acpi_status status;
> +     struct acpi_i2c_root *root;
> +     struct resource *resources;
> +     int result;
> +
> +     if (!device->pnp.unique_id) {
> +             dev_err(&device->dev,
> +                     "Unsupported ACPI I2C controller. No UID\n");

Where does this restriction come from? As far as I understand UID is
optional.

> +             return -ENODEV;
> +     }
> +
> +     root = kzalloc(sizeof(struct acpi_i2c_root), GFP_KERNEL);
> +     if (!root)
> +             return -ENOMEM;
> +
> +     root->device = device;
> +
> +     kstrtoint(device->pnp.unique_id, 10, &root->busnum);
> +
> +     /* enumerate I2C controller */
> +     root->pdev =
> +         platform_device_alloc(acpi_device_hid(device), root->busnum);
> +     if (!root->pdev) {
> +             dev_err(&device->dev, "Failed to alloc platform device\n");
> +             goto err;
> +     }
> +
> +     result = acpi_get_generic_resources(device, &resources);
> +     if (result < 0) {
> +             dev_err(&device->dev, "Failed to get resources\n");
> +             goto err;
> +     }
> +
> +     platform_device_add_resources(root->pdev, resources, result);
> +     platform_device_add(root->pdev);
> +
> +     /* enumerate I2C slave devices */
> +     status = acpi_walk_namespace(ACPI_TYPE_DEVICE, root->device->handle, 1,
> +                                  i2c_enumerate_slave, NULL, root, NULL);
> +
> +     if (ACPI_FAILURE(status)) {
> +             dev_err(&root->device->dev, "i2c ACPI namespace walk error!\n");
> +             kfree(root);
> +             return -ENODEV;
> +     }
> +
> +     register_slaves(root);
> +
> +     return 0;
> +err:
> +     kfree(root);
> +     return -ENODEV;
> +}
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