184 lines
3.7 KiB
C
184 lines
3.7 KiB
C
/*
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* ISA bus.
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*/
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/dma-mapping.h>
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#include <linux/isa.h>
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static struct device isa_bus = {
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.init_name = "isa"
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};
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struct isa_dev {
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struct device dev;
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struct device *next;
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unsigned int id;
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};
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#define to_isa_dev(x) container_of((x), struct isa_dev, dev)
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static int isa_bus_match(struct device *dev, struct device_driver *driver)
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{
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struct isa_driver *isa_driver = to_isa_driver(driver);
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if (dev->platform_data == isa_driver) {
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if (!isa_driver->match ||
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isa_driver->match(dev, to_isa_dev(dev)->id))
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return 1;
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dev->platform_data = NULL;
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}
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return 0;
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}
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static int isa_bus_probe(struct device *dev)
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{
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struct isa_driver *isa_driver = dev->platform_data;
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if (isa_driver->probe)
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return isa_driver->probe(dev, to_isa_dev(dev)->id);
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return 0;
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}
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static int isa_bus_remove(struct device *dev)
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{
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struct isa_driver *isa_driver = dev->platform_data;
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if (isa_driver->remove)
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return isa_driver->remove(dev, to_isa_dev(dev)->id);
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return 0;
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}
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static void isa_bus_shutdown(struct device *dev)
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{
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struct isa_driver *isa_driver = dev->platform_data;
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if (isa_driver->shutdown)
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isa_driver->shutdown(dev, to_isa_dev(dev)->id);
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}
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static int isa_bus_suspend(struct device *dev, pm_message_t state)
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{
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struct isa_driver *isa_driver = dev->platform_data;
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if (isa_driver->suspend)
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return isa_driver->suspend(dev, to_isa_dev(dev)->id, state);
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return 0;
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}
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static int isa_bus_resume(struct device *dev)
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{
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struct isa_driver *isa_driver = dev->platform_data;
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if (isa_driver->resume)
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return isa_driver->resume(dev, to_isa_dev(dev)->id);
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return 0;
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}
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static struct bus_type isa_bus_type = {
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.name = "isa",
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.match = isa_bus_match,
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.probe = isa_bus_probe,
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.remove = isa_bus_remove,
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.shutdown = isa_bus_shutdown,
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.suspend = isa_bus_suspend,
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.resume = isa_bus_resume
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};
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static void isa_dev_release(struct device *dev)
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{
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kfree(to_isa_dev(dev));
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}
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void isa_unregister_driver(struct isa_driver *isa_driver)
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{
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struct device *dev = isa_driver->devices;
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while (dev) {
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struct device *tmp = to_isa_dev(dev)->next;
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device_unregister(dev);
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dev = tmp;
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}
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driver_unregister(&isa_driver->driver);
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}
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EXPORT_SYMBOL_GPL(isa_unregister_driver);
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int isa_register_driver(struct isa_driver *isa_driver, unsigned int ndev)
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{
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int error;
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unsigned int id;
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isa_driver->driver.bus = &isa_bus_type;
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isa_driver->devices = NULL;
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error = driver_register(&isa_driver->driver);
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if (error)
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return error;
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for (id = 0; id < ndev; id++) {
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struct isa_dev *isa_dev;
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isa_dev = kzalloc(sizeof *isa_dev, GFP_KERNEL);
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if (!isa_dev) {
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error = -ENOMEM;
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break;
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}
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isa_dev->dev.parent = &isa_bus;
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isa_dev->dev.bus = &isa_bus_type;
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dev_set_name(&isa_dev->dev, "%s.%u",
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isa_driver->driver.name, id);
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isa_dev->dev.platform_data = isa_driver;
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isa_dev->dev.release = isa_dev_release;
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isa_dev->id = id;
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isa_dev->dev.coherent_dma_mask = DMA_BIT_MASK(24);
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isa_dev->dev.dma_mask = &isa_dev->dev.coherent_dma_mask;
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error = device_register(&isa_dev->dev);
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if (error) {
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put_device(&isa_dev->dev);
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break;
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}
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if (isa_dev->dev.platform_data) {
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isa_dev->next = isa_driver->devices;
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isa_driver->devices = &isa_dev->dev;
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} else
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device_unregister(&isa_dev->dev);
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}
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if (!error && !isa_driver->devices)
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error = -ENODEV;
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if (error)
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isa_unregister_driver(isa_driver);
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return error;
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}
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EXPORT_SYMBOL_GPL(isa_register_driver);
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static int __init isa_bus_init(void)
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{
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int error;
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error = bus_register(&isa_bus_type);
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if (!error) {
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error = device_register(&isa_bus);
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if (error)
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bus_unregister(&isa_bus_type);
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}
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return error;
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}
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device_initcall(isa_bus_init);
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