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184 lines
3.8 KiB
184 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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 && 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 && 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 && 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 && 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 && 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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postcore_initcall(isa_bus_init);
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