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Driver core: add platform_create_bundle() helper
Many legacy-style module create singleton platform devices themselves, along with corresponding platform driver. Instead of replicating error handling code in all such drivers, provide a helper that allocates and registers a single platform device and a driver and binds them together. Signed-off-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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2 changed files with 63 additions and 0 deletions
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@ -548,6 +548,64 @@ int __init_or_module platform_driver_probe(struct platform_driver *drv,
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}
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}
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EXPORT_SYMBOL_GPL(platform_driver_probe);
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EXPORT_SYMBOL_GPL(platform_driver_probe);
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/**
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* platform_create_bundle - register driver and create corresponding device
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* @driver: platform driver structure
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* @probe: the driver probe routine, probably from an __init section
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* @res: set of resources that needs to be allocated for the device
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* @n_res: number of resources
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* @data: platform specific data for this platform device
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* @size: size of platform specific data
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*
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* Use this in legacy-style modules that probe hardware directly and
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* register a single platform device and corresponding platform driver.
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*/
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struct platform_device * __init_or_module platform_create_bundle(
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struct platform_driver *driver,
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int (*probe)(struct platform_device *),
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struct resource *res, unsigned int n_res,
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const void *data, size_t size)
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{
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struct platform_device *pdev;
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int error;
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pdev = platform_device_alloc(driver->driver.name, -1);
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if (!pdev) {
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error = -ENOMEM;
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goto err_out;
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}
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if (res) {
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error = platform_device_add_resources(pdev, res, n_res);
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if (error)
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goto err_pdev_put;
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}
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if (data) {
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error = platform_device_add_data(pdev, data, size);
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if (error)
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goto err_pdev_put;
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}
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error = platform_device_add(pdev);
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if (error)
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goto err_pdev_put;
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error = platform_driver_probe(driver, probe);
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if (error)
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goto err_pdev_del;
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return pdev;
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err_pdev_del:
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platform_device_del(pdev);
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err_pdev_put:
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platform_device_put(pdev);
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err_out:
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return ERR_PTR(error);
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}
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EXPORT_SYMBOL_GPL(platform_create_bundle);
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/* modalias support enables more hands-off userspace setup:
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/* modalias support enables more hands-off userspace setup:
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* (a) environment variable lets new-style hotplug events work once system is
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* (a) environment variable lets new-style hotplug events work once system is
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* fully running: "modprobe $MODALIAS"
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* fully running: "modprobe $MODALIAS"
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@ -77,6 +77,11 @@ extern int platform_driver_probe(struct platform_driver *driver,
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#define platform_get_drvdata(_dev) dev_get_drvdata(&(_dev)->dev)
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#define platform_get_drvdata(_dev) dev_get_drvdata(&(_dev)->dev)
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#define platform_set_drvdata(_dev,data) dev_set_drvdata(&(_dev)->dev, (data))
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#define platform_set_drvdata(_dev,data) dev_set_drvdata(&(_dev)->dev, (data))
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extern struct platform_device *platform_create_bundle(struct platform_driver *driver,
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int (*probe)(struct platform_device *),
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struct resource *res, unsigned int n_res,
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const void *data, size_t size);
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/* early platform driver interface */
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/* early platform driver interface */
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struct early_platform_driver {
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struct early_platform_driver {
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const char *class_str;
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const char *class_str;
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