1 files changed, 192 insertions, 0 deletions
diff --git a/driver/compat.h b/driver/compat.h
new file mode 100644
index 0000000..80f232b
--- /dev/null
+++ b/driver/compat.h
@@ -0,0 +1,192 @@
+/**
+ *
+ * @file compat.h
+ * @author Michael Stapelberg
+ * @date 2009-04-05
+ * @brief Contains compatibility definitions for the different linux kernel versions to avoid
+ * putting ifdefs all over the driver code.
+ *
+ */
+#ifndef _COMPAT_H
+#define _COMPAT_H
+
+/* dev_name is the wrapper one needs to use to access what was formerly called
+ * bus_id in struct device. However, before 2.6.27, direct access was necessary,
+ * so we provide our own version. */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27)
+static inline const char *dev_name(struct device *dev) {
+	return dev->bus_id;
+}
+#endif
+
+/* SetPageLocked disappeared in v2.6.27 */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27)
+	#define compat_lock_page SetPageLocked
+	#define compat_unlock_page ClearPageLocked
+#else
+	/* in v2.6.28, __set_page_locked and __clear_page_locked was introduced */
+	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28)
+		#define compat_lock_page __set_page_locked
+		#define compat_unlock_page __clear_page_locked
+	#else
+		/* However, in v2.6.27 itself, neither of them is there, so
+		 * we need to use our own function fiddling with bits inside
+		 * the page struct :-\ */
+		static inline void compat_lock_page(struct page *page) {
+			__set_bit(PG_locked, &page->flags);
+		}
+
+		static inline void compat_unlock_page(struct page *page) {
+			__clear_bit(PG_locked, &page->flags);
+		}
+	#endif
+#endif
+
+/* Before 2.6.13, simple_class was the standard interface. Nowadays, it's just called class */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13)
+
+	#define class_compat class_simple
+
+	/* These functions are redirected to their old corresponding functions */
+	#define class_create(module, name) class_simple_create(module, name)
+	#define class_destroy(type) class_simple_destroy(type)
+	#define class_device_destroy(unused, devno) class_simple_device_remove(devno)
+	#define class_device_create(type, unused, devno, devpointer, nameformat, minor, unused) \
+		class_simple_device_add(type, devno, devpointer, nameformat, minor)
+	#define class_set_devdata(classdev, privdata) classdev->class_data = privdata
+	#define DEVICE_ATTR_COMPAT
+	#define sysfs_attr_def_name(name) class_device_attr_##name
+	#define sysfs_attr_def_pointer privdata->class_dev
+	#define SYSFS_GET_FUNCTION(name) ssize_t name(struct class_device *cls, char *buf)
+	#define SYSFS_SET_FUNCTION(name) ssize_t name(struct class_device *cls, const char *buf, size_t count)
+	#define SYSFS_GET_PRIVDATA (pcidriver_privdata_t*)cls->class_data
+
+#else
+
+/* In 2.6.26, device.h was changed quite significantly. Luckily, it only affected
+   type/function names, for the most part. */
+//#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
+	#define class_device_attribute device_attribute
+	#define CLASS_DEVICE_ATTR DEVICE_ATTR
+	#define class_device device
+	#define class_data dev
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27)
+	#define class_device_create(type, parent, devno, devpointer, nameformat, minor, privdata) \
+		device_create(type, parent, devno, privdata, nameformat, minor)
+#else
+	#define class_device_create(type, parent, devno, devpointer, nameformat, minor, unused) \
+		device_create(type, parent, devno, nameformat, minor)
+#endif
+	#define class_device_create_file device_create_file
+	#define class_device_remove_file device_remove_file
+	#define class_device_destroy device_destroy
+	#define DEVICE_ATTR_COMPAT struct device_attribute *attr,
+	#define class_set_devdata dev_set_drvdata
+
+	#define sysfs_attr_def_name(name) dev_attr_##name
+	#define sysfs_attr_def_pointer privdata->class_dev
+	#define SYSFS_GET_FUNCTION(name) ssize_t name(struct device *dev, struct device_attribute *attr, char *buf)
+	#define SYSFS_SET_FUNCTION(name) ssize_t name(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+	#define SYSFS_GET_PRIVDATA dev_get_drvdata(dev)
+
+//#endif
+
+#define class_compat class
+
+#endif
+
+/* The arguments of IRQ handlers have been changed in 2.6.19. It's very likely that
+   int irq will disappear somewhen in the future (current is 2.6.29), too. */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19)
+	#define IRQ_HANDLER_FUNC(name) irqreturn_t name(int irq, void *dev_id)
+#else
+	#define IRQ_HANDLER_FUNC(name) irqreturn_t name(int irq, void *dev_id, struct pt_regs *regs)
+#endif
+
+/* atomic_inc_return appeared in 2.6.9, at least in CERN scientific linux, provide
+   compatibility wrapper for older kernels */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,9)
+static int atomic_inc_return(atomic_t *variable) {
+	atomic_inc(variable);
+	return atomic_read(variable);
+}
+#endif
+
+/* sg_set_page is available starting at 2.6.24 */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)
+
+#define sg_set_page(sg, set_page, set_length, set_offset) do { \
+	(sg)->page = set_page; \
+	(sg)->length = set_length; \
+	(sg)->offset = set_offset; \
+} while (0)
+
+#endif
+
+/* Before 2.6.20, disable was not an atomic counter, so this check was needed */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20)
+#define pci_disable_device(pdev) do { \
+	if (pdev->is_enabled) \
+		pci_disable_device(pdev); \
+} while (0)
+#endif
+
+/* Before 2.6.24, scatter/gather lists did not need to be initialized */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)
+	#define sg_init_table(sg, nr_pages)
+#endif
+
+/* SA_SHIRQ was renamed to IRQF_SHARED in 2.6.24 */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
+	#define request_irq(irq, irq_handler, modname, privdata) request_irq(irq, irq_handler, IRQF_SHARED, modname, privdata)
+#else
+	#define request_irq(irq, irq_handler, modname, privdata) request_irq(irq, irq_handler, SA_SHIRQ, modname, privdata)
+#endif
+
+/* In 2.6.13, io_remap_page_range was removed in favor for io_remap_pfn_range which works on
+   more platforms and allows more memory space */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,13)
+#define io_remap_pfn_range_compat(vmap, vm_start, bar_addr, bar_length, vm_page_prot) \
+	io_remap_pfn_range(vmap, vm_start, (bar_addr >> PAGE_SHIFT), bar_length, vm_page_prot)
+#else
+#define io_remap_pfn_range_compat(vmap, vm_start, bar_addr, bar_length, vm_page_prot) \
+	io_remap_page_range(vmap, vm_start, bar_addr, bar_length, vm_page_prot)
+#endif
+
+/* In 2.6.10, remap_pfn_range was introduced, see io_remap_pfn_range_compat */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,10)
+#define remap_pfn_range_compat(vmap, vm_start, bar_addr, bar_length, vm_page_prot) \
+	remap_pfn_range(vmap, vm_start, (bar_addr >> PAGE_SHIFT), bar_length, vm_page_prot)
+
+#define remap_pfn_range_cpua_compat(vmap, vm_start, cpua, size, vm_page_prot) \
+	remap_pfn_range(vmap, vm_start, page_to_pfn(virt_to_page((void*)cpua)), size, vm_page_prot)
+
+#else
+#define remap_pfn_range_compat(vmap, vm_start, bar_addr, bar_length, vm_page_prot) \
+	remap_page_range(vmap, vm_start, bar_addr, bar_length, vm_page_prot)
+
+#define remap_pfn_range_cpua_compat(vmap, vm_start, cpua, size, vm_page_prot) \
+	remap_page_range(vmap, vm_start, virt_to_phys((void*)cpua), size, vm_page_prot)
+#endif
+
+/**
+ * Go over the pages of the kmem buffer, and mark them as reserved.
+ * This is needed, otherwise mmaping the kernel memory to user space
+ * will fail silently (mmaping /dev/null) when using remap_xx_range.
+ */
+static inline void set_pages_reserved_compat(unsigned long cpua, unsigned long size)
+{
+	/* Starting in 2.6.15, the PG_RESERVED bit was removed.
+	   See also http://lwn.net/Articles/161204/ */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15)
+	struct page *page, *last_page;
+
+	page = virt_to_page(cpua);
+	last_page = virt_to_page(cpua + size - 1);
+
+	for (; page <= last_page; page++)
+               SetPageReserved(page);
+#endif
+}
+
+#endif