1 files changed, 180 insertions, 0 deletions

diff --git a/drivers/base/isa.c b/drivers/base/isa.c
new file mode 100644
index 000000000000..d2222397a401
--- /dev/null
+++ b/drivers/base/isa.c
@@ -0,0 +1,180 @@
+/*
+ * ISA bus.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/isa.h>
+
+static struct device isa_bus = {
+        .bus_id         = "isa"
+};
+
+struct isa_dev {
+        struct device dev;
+        struct device *next;
+        unsigned int id;
+};
+
+#define to_isa_dev(x) container_of((x), struct isa_dev, dev)
+
+static int isa_bus_match(struct device *dev, struct device_driver *driver)
+{
+        struct isa_driver *isa_driver = to_isa_driver(driver);
+
+        if (dev->platform_data == isa_driver) {
+                if (!isa_driver->match ||
+                        isa_driver->match(dev, to_isa_dev(dev)->id))
+                        return 1;
+                dev->platform_data = NULL;
+        }
+        return 0;
+}
+
+static int isa_bus_probe(struct device *dev)
+{
+        struct isa_driver *isa_driver = dev->platform_data;
+
+        if (isa_driver->probe)
+                return isa_driver->probe(dev, to_isa_dev(dev)->id);
+
+        return 0;
+}
+
+static int isa_bus_remove(struct device *dev)
+{
+        struct isa_driver *isa_driver = dev->platform_data;
+
+        if (isa_driver->remove)
+                return isa_driver->remove(dev, to_isa_dev(dev)->id);
+
+        return 0;
+}
+
+static void isa_bus_shutdown(struct device *dev)
+{
+        struct isa_driver *isa_driver = dev->platform_data;
+
+        if (isa_driver->shutdown)
+                isa_driver->shutdown(dev, to_isa_dev(dev)->id);
+}
+
+static int isa_bus_suspend(struct device *dev, pm_message_t state)
+{
+        struct isa_driver *isa_driver = dev->platform_data;
+
+        if (isa_driver->suspend)
+                return isa_driver->suspend(dev, to_isa_dev(dev)->id, state);
+
+        return 0;
+}
+
+static int isa_bus_resume(struct device *dev)
+{
+        struct isa_driver *isa_driver = dev->platform_data;
+
+        if (isa_driver->resume)
+                return isa_driver->resume(dev, to_isa_dev(dev)->id);
+
+        return 0;
+}
+
+static struct bus_type isa_bus_type = {
+        .name           = "isa",
+        .match          = isa_bus_match,
+        .probe          = isa_bus_probe,
+        .remove         = isa_bus_remove,
+        .shutdown       = isa_bus_shutdown,
+        .suspend        = isa_bus_suspend,
+        .resume         = isa_bus_resume
+};
+
+static void isa_dev_release(struct device *dev)
+{
+        kfree(to_isa_dev(dev));
+}
+
+void isa_unregister_driver(struct isa_driver *isa_driver)
+{
+        struct device *dev = isa_driver->devices;
+
+        while (dev) {
+                struct device *tmp = to_isa_dev(dev)->next;
+                device_unregister(dev);
+                dev = tmp;
+        }
+        driver_unregister(&isa_driver->driver);
+}
+EXPORT_SYMBOL_GPL(isa_unregister_driver);
+
+int isa_register_driver(struct isa_driver *isa_driver, unsigned int ndev)
+{
+        int error;
+        unsigned int id;
+
+        isa_driver->driver.bus  = &isa_bus_type;
+        isa_driver->devices     = NULL;
+
+        error = driver_register(&isa_driver->driver);
+        if (error)
+                return error;
+
+        for (id = 0; id < ndev; id++) {
+                struct isa_dev *isa_dev;
+
+                isa_dev = kzalloc(sizeof *isa_dev, GFP_KERNEL);
+                if (!isa_dev) {
+                        error = -ENOMEM;
+                        break;
+                }
+
+                isa_dev->dev.parent     = &isa_bus;
+                isa_dev->dev.bus        = &isa_bus_type;
+
+                snprintf(isa_dev->dev.bus_id, BUS_ID_SIZE, "%s.%u",
+                                isa_driver->driver.name, id);
+
+                isa_dev->dev.platform_data      = isa_driver;
+                isa_dev->dev.release            = isa_dev_release;
+                isa_dev->id                     = id;
+
+                error = device_register(&isa_dev->dev);
+                if (error) {
+                        put_device(&isa_dev->dev);
+                        break;
+                }
+
+                if (isa_dev->dev.platform_data) {
+                        isa_dev->next = isa_driver->devices;
+                        isa_driver->devices = &isa_dev->dev;
+                } else
+                        device_unregister(&isa_dev->dev);
+        }
+
+        if (!error && !isa_driver->devices)
+                error = -ENODEV;
+
+        if (error)
+                isa_unregister_driver(isa_driver);
+
+        return error;
+}
+EXPORT_SYMBOL_GPL(isa_register_driver);
+
+static int __init isa_bus_init(void)
+{
+        int error;
+
+        error = bus_register(&isa_bus_type);
+        if (!error) {
+                error = device_register(&isa_bus);
+                if (error)
+                        bus_unregister(&isa_bus_type);
+        }
+        return error;
+}
+
+device_initcall(isa_bus_init);