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Add skeleton of allocation code for kmalloc and kfree. Currently allocates a dummy storage area.

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This commit is contained in:
Robin Mallinson 2012-11-18 14:36:05 +00:00
parent 4b87d814df
commit d6e1b2efe5
2 changed files with 13 additions and 1 deletions
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14
ServoBlaster/servoblaster.c
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@ -47,6 +47,7 @@
#include <linux/scatterlist.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <mach/platform.h>
#include <asm/uaccess.h>
#include <mach/dma.h>
@ -315,12 +316,22 @@ void cleanup_module(void)
unregister_chrdev_region(devno, 1);
}
// kmalloc the temporary data required for each user:
// *returnedData string for dev_read
// *useCommand buffer for dev_write to allow incremental writing of data.
static int dev_open(struct inode *inod,struct file *fil)
{
fil->private_data = kmalloc( 32, GFP_KERNEL );
if (0 == fil->private_data)
{
printk(KERN_WARNING "ServoBlaster: Failed to allocate user data\n");
return -ENOMEM;
}
return 0;
}
// This records the written count values. Cannot derive data directly from DMA
// control blocks as current algorithm has a special case for a count of zero.
static int written_data[NUM_SERVOS] = { 0 };
static ssize_t dev_read(struct file *filp,char *buf,size_t count,loff_t *f_pos)
@ -418,6 +429,7 @@ static ssize_t dev_write(struct file *filp,const char *buf,size_t count,loff_t *
static int dev_close(struct inode *inod,struct file *fil)
{
if (0 != fil->private_data) kfree(fil->private_data);
return 0;
}

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ServoBlaster/servoblaster.ko
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