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-rw-r--r--drivers/base/Makefile1
-rw-r--r--drivers/base/isa.c180
-rw-r--r--include/linux/isa.h28
3 files changed, 209 insertions, 0 deletions
diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index 659cde6c2fb9..b539e5e75b56 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -5,6 +5,7 @@ obj-y := core.o sys.o bus.o dd.o \
cpu.o firmware.o init.o map.o dmapool.o \
attribute_container.o transport_class.o
obj-y += power/
+obj-$(CONFIG_ISA) += isa.o
obj-$(CONFIG_FW_LOADER) += firmware_class.o
obj-$(CONFIG_NUMA) += node.o
obj-$(CONFIG_MEMORY_HOTPLUG) += memory.o
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);
diff --git a/include/linux/isa.h b/include/linux/isa.h
new file mode 100644
index 000000000000..1b855335cb11
--- /dev/null
+++ b/include/linux/isa.h
@@ -0,0 +1,28 @@
+/*
+ * ISA bus.
+ */
+
+#ifndef __LINUX_ISA_H
+#define __LINUX_ISA_H
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+
+struct isa_driver {
+ int (*match)(struct device *, unsigned int);
+ int (*probe)(struct device *, unsigned int);
+ int (*remove)(struct device *, unsigned int);
+ void (*shutdown)(struct device *, unsigned int);
+ int (*suspend)(struct device *, unsigned int, pm_message_t);
+ int (*resume)(struct device *, unsigned int);
+
+ struct device_driver driver;
+ struct device *devices;
+};
+
+#define to_isa_driver(x) container_of((x), struct isa_driver, driver)
+
+int isa_register_driver(struct isa_driver *, unsigned int);
+void isa_unregister_driver(struct isa_driver *);
+
+#endif /* __LINUX_ISA_H */