Linux Device Drivers 3 examples

1 files changed, 126 insertions, 0 deletions

diff --git a/sculld/sculld.h b/sculld/sculld.h
new file mode 100644
index 0000000..8c21f75
--- /dev/null
+++ b/sculld/sculld.h
@@ -0,0 +1,126 @@
+/* -*- C -*-
+ * sculld.h -- definitions for the sculld char module
+ *
+ * Copyright (C) 2001 Alessandro Rubini and Jonathan Corbet
+ * Copyright (C) 2001 O'Reilly & Associates
+ *
+ * The source code in this file can be freely used, adapted,
+ * and redistributed in source or binary form, so long as an
+ * acknowledgment appears in derived source files.  The citation
+ * should list that the code comes from the book "Linux Device
+ * Drivers" by Alessandro Rubini and Jonathan Corbet, published
+ * by O'Reilly & Associates.   No warranty is attached;
+ * we cannot take responsibility for errors or fitness for use.
+ */
+
+#include <linux/ioctl.h>
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include "../include/lddbus.h"
+
+/*
+ * Macros to help debugging
+ */
+
+#undef PDEBUG             /* undef it, just in case */
+#ifdef SCULLD_DEBUG
+#  ifdef __KERNEL__
+     /* This one if debugging is on, and kernel space */
+#    define PDEBUG(fmt, args...) printk( KERN_DEBUG "sculld: " fmt, ## args)
+#  else
+     /* This one for user space */
+#    define PDEBUG(fmt, args...) fprintf(stderr, fmt, ## args)
+#  endif
+#else
+#  define PDEBUG(fmt, args...) /* not debugging: nothing */
+#endif
+
+#undef PDEBUGG
+#define PDEBUGG(fmt, args...) /* nothing: it's a placeholder */
+
+#define SCULLD_MAJOR 0   /* dynamic major by default */
+
+#define SCULLD_DEVS 4    /* sculld0 through sculld3 */
+
+/*
+ * The bare device is a variable-length region of memory.
+ * Use a linked list of indirect blocks.
+ *
+ * "sculld_dev->data" points to an array of pointers, each
+ * pointer refers to a memory page.
+ *
+ * The array (quantum-set) is SCULLD_QSET long.
+ */
+#define SCULLD_ORDER    0 /* one page at a time */
+#define SCULLD_QSET     500
+
+struct sculld_dev {
+	void **data;
+	struct sculld_dev *next;  /* next listitem */
+	int vmas;                 /* active mappings */
+	int order;                /* the current allocation order */
+	int qset;                 /* the current array size */
+	size_t size;              /* 32-bit will suffice */
+	struct semaphore sem;     /* Mutual exclusion */
+	struct cdev cdev;
+	char devname[20];
+	struct ldd_device ldev;
+};
+
+extern struct sculld_dev *sculld_devices;
+
+extern struct file_operations sculld_fops;
+
+/*
+ * The different configurable parameters
+ */
+extern int sculld_major;     /* main.c */
+extern int sculld_devs;
+extern int sculld_order;
+extern int sculld_qset;
+
+/*
+ * Prototypes for shared functions
+ */
+int sculld_trim(struct sculld_dev *dev);
+struct sculld_dev *sculld_follow(struct sculld_dev *dev, int n);
+
+
+#ifdef SCULLD_DEBUG
+#  define SCULLD_USE_PROC
+#endif
+
+/*
+ * Ioctl definitions
+ */
+
+/* Use 'K' as magic number */
+#define SCULLD_IOC_MAGIC  'K'
+
+#define SCULLD_IOCRESET    _IO(SCULLD_IOC_MAGIC, 0)
+
+/*
+ * S means "Set" through a ptr,
+ * T means "Tell" directly
+ * G means "Get" (to a pointed var)
+ * Q means "Query", response is on the return value
+ * X means "eXchange": G and S atomically
+ * H means "sHift": T and Q atomically
+ */
+#define SCULLD_IOCSORDER   _IOW(SCULLD_IOC_MAGIC,  1, int)
+#define SCULLD_IOCTORDER   _IO(SCULLD_IOC_MAGIC,   2)
+#define SCULLD_IOCGORDER   _IOR(SCULLD_IOC_MAGIC,  3, int)
+#define SCULLD_IOCQORDER   _IO(SCULLD_IOC_MAGIC,   4)
+#define SCULLD_IOCXORDER   _IOWR(SCULLD_IOC_MAGIC, 5, int)
+#define SCULLD_IOCHORDER   _IO(SCULLD_IOC_MAGIC,   6)
+#define SCULLD_IOCSQSET    _IOW(SCULLD_IOC_MAGIC,  7, int)
+#define SCULLD_IOCTQSET    _IO(SCULLD_IOC_MAGIC,   8)
+#define SCULLD_IOCGQSET    _IOR(SCULLD_IOC_MAGIC,  9, int)
+#define SCULLD_IOCQQSET    _IO(SCULLD_IOC_MAGIC,  10)
+#define SCULLD_IOCXQSET    _IOWR(SCULLD_IOC_MAGIC,11, int)
+#define SCULLD_IOCHQSET    _IO(SCULLD_IOC_MAGIC,  12)
+
+#define SCULLD_IOC_MAXNR 12
+
+
+