Drop support of kernels prior to 3.2 (Debian 7, Ubuntu 12.04)

1 files changed, 37 insertions, 161 deletions

diff --git a/driver/compat.h b/driver/compat.h
index 5232a22..a8a2cf0 100644
--- a/driver/compat.h
+++ b/driver/compat.h
@@ -10,196 +10,72 @@
 #ifndef _COMPAT_H
 #define _COMPAT_H
 
-/*
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3,0,0)
-# error "Linux 3.0 and latter are supported"
-#endif
-*/
+#include <linux/version.h>
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)
-# define __devinit
-# define __devexit
-# define __devinitdata
+/* Check macros and kernel version first */
+#ifndef KERNEL_VERSION
+# error "No KERNEL_VERSION macro! Stopping."
 #endif
 
-/* 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;
-}
+#ifndef LINUX_VERSION_CODE
+# error "No LINUX_VERSION_CODE macro! Stopping."
 #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
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,2,0)
+# error "Linux 3.2 and latter are supported"
 #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)
+/* VM_RESERVED is removed in 3.7-rc1 */
+#ifndef VM_RESERVED
+# define  VM_RESERVED   (VM_DONTEXPAND | VM_DONTDUMP)
 #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
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)
+# define __devinit
+# define __devexit
+# define __devinitdata
 #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
+#define compat_lock_page __set_page_locked
+#define compat_unlock_page __clear_page_locked
 
-/* 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 class_device_attribute device_attribute
+#define CLASS_DEVICE_ATTR DEVICE_ATTR
+#define class_device device
+#define class_data dev
+#define class_device_create(type, parent, devno, devpointer, nameformat, minor, privdata) \
+		device_create(type, parent, devno, privdata, nameformat, minor)
+#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)
 
-#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)
+#define class_compat class
 
-#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
+#define IRQ_HANDLER_FUNC(name) irqreturn_t name(int irq, void *dev_id)
 
-/* 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
+#define request_irq(irq, irq_handler, modname, privdata) request_irq(irq, irq_handler, IRQF_SHARED, modname, privdata)
 
-/* 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
-}
 
 int pcidriver_pcie_get_mps(struct pci_dev *dev);
 int pcidriver_pcie_set_mps(struct pci_dev *dev, int mps);