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add multi low level driver support, use kernel<->user-space copy functions

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git-svn-id: svn+ssh://en.codiert.org/home/staff/ben/dev/misc.svn/projects/fpgafs@389 766a2236-cff9-0310-b0c0-a81a5f92509a
This commit is contained in:
ben 2007-09-10 07:45:12 +00:00
parent 638cd927bb
commit 24c36a0d8d
4 changed files with 122 additions and 26 deletions
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17
files.c
View File

@ -45,11 +45,6 @@ static ssize_t fpgafs_stat_read(struct file *file, char __user *buf,
return 4;
}
static const struct file_operations fpgafs_stat_fops = {
.open = fpgafs_open,
.read = fpgafs_stat_read,
};
static ssize_t fpgafs_cmd_write(struct file *file, const char __user *buf,
size_t len, loff_t *pos)
{
@ -69,6 +64,11 @@ static ssize_t fpgafs_cmd_write(struct file *file, const char __user *buf,
return 4;
}
static const struct file_operations fpgafs_stat_fops = {
.open = fpgafs_open,
.read = fpgafs_stat_read,
};
static const struct file_operations fpgafs_cmd_fops = {
.open = fpgafs_open,
.write = fpgafs_cmd_write,
@ -90,11 +90,18 @@ static const struct file_operations fpgafs_dout_fops = {
.write = fpgafs_send_data,
};
static const struct file_operations fpgafs_lldrv_fops = {
.open = fpgafs_open,
.write = fpgafs_write_lldrv,
.read = fpgafs_read_lldrv,
};
struct tree_descr fpgafs_dir_contents[] = {
{ "din", &fpgafs_din_fops, 0222, },
{ "dout", &fpgafs_dout_fops, 0444, },
{ "load", &fpgafs_load_fops, 0666, },
{ "cmd", &fpgafs_cmd_fops, 0222, },
{ "stat", &fpgafs_stat_fops, 0444, },
{ "lldrv", &fpgafs_lldrv_fops, 0444, },
{},
};

7
fpgafs.h
View File

@ -16,7 +16,7 @@ enum {
struct fpga_context {
char *load_buf;
unsigned intlldrv;
unsigned int lldrv;
int bla;
};
@ -61,6 +61,11 @@ ssize_t fpgafs_write_load(struct file *file, const char __user *buf,
ssize_t fpgafs_read_load(struct file *file, char __user *buf,
size_t len, loff_t *pos);
ssize_t fpgafs_write_lldrv(struct file *file, const char __user *buf,
size_t len, loff_t *pos);
ssize_t fpgafs_read_lldrv(struct file *file, char __user *buf,
size_t len, loff_t *pos);
struct fpga_context* alloc_fpga_context(void);
void free_fpga_context(struct fpga_context *ctx);
#endif /* FPGAFS_H */

39
fpgafs_lldrv_rag.c
View File

@ -1,10 +1,12 @@
/*********************************************
* Benjamin Krill <ben@codiert.org>
*********************************************/
#include <linux/pagemap.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/mm.h>
#include "fpgafs.h"
#define VENDOR_ID_ALTERA 0x1172
@ -14,24 +16,49 @@ static void *vaddr = 0;
static unsigned long memstart = 0, memlen = 0;
/* len must 2 or higher ... */
static int fpgafs_send_data_rag(struct fpga_context *ctx, const char __user *buf, int len)
{
int i;
for(i=0; i < len; i+=2)
writew((buf[i+1] << 8)|buf[i], vaddr);
u8 __user *usr;
unsigned char dat[2];
if (len < 2)
return -EINVAL;
if (!access_ok(VERIFY_READ, buf, len))
return -EFAULT;
for(i=0; i < len; i+=2) {
usr = (u8*)&buf[i];
if (__get_user(dat[0], usr))
return -EFAULT;
usr = (u8*)&buf[i+1];
if (__get_user(dat[1], usr))
return -EFAULT;
writew((dat[1] << 8)|dat[0], vaddr);
}
return i;
}
/* len must 2 or higher ... */
static int fpgafs_recv_data_rag(struct fpga_context *ctx, unsigned char *buf, int len)
{
int i; unsigned short d;
unsigned char b[2];
if ((len < 2) || ((len % 2) != 0))
return -EINVAL;
for(i=0; i < len; i+=2) {
d=readw((void *)((unsigned int)vaddr | 0x20));
buf[i] = d & 0xff;
buf[i+1] = d >> 8;
b[i] = d & 0xff;
b[i+1] = d >> 8;
if (copy_to_user(b, ctx->load_buf, 2))
return -EFAULT;
}
return i;
}

85
llmgmt.c
View File

@ -1,9 +1,11 @@
/*********************************************
* Benjamin Krill <ben@codiert.org>
*********************************************/
#include <linux/pagemap.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mm.h>
#include "fpgafs.h"
#define FPGAFS_MAX_LLDRV 3
@ -20,7 +22,8 @@ struct fpga_context* alloc_fpga_context(void)
if (!ctx)
goto out;
/* do some stuff */
/* initialize the struct*/
ctx->lldrv = -1;
out:
return ctx;
@ -38,8 +41,9 @@ void free_fpga_context(struct fpga_context *ctx)
ssize_t fpgafs_send_data(struct file *file, const char __user *buf,
size_t len, loff_t *pos)
{
return (lldrv_cur) ?
lldrv_cur->send((struct fpga_context*)file->private_data, buf, len)
struct fpga_context *fcur = (struct fpga_context*)file->private_data;
return (fcur->lldrv > -1) ?
lldrv[fcur->lldrv]->send(fcur, buf, len)
: -EBUSY;
}
EXPORT_SYMBOL_GPL(fpgafs_send_data);
@ -47,8 +51,9 @@ EXPORT_SYMBOL_GPL(fpgafs_send_data);
ssize_t fpgafs_recv_data(struct file *file, char __user *buf,
size_t len, loff_t *pos)
{
return (lldrv_cur) ?
lldrv_cur->recv((struct fpga_context*)file->private_data, buf, len)
struct fpga_context *fcur = (struct fpga_context*)file->private_data;
return (fcur->lldrv > -1) ?
lldrv[fcur->lldrv]->recv(fcur, buf, len)
: -EBUSY;
}
EXPORT_SYMBOL_GPL(fpgafs_recv_data);
@ -56,8 +61,9 @@ EXPORT_SYMBOL_GPL(fpgafs_recv_data);
ssize_t fpgafs_write_load(struct file *file, const char __user *buf,
size_t len, loff_t *pos)
{
return (lldrv_cur) ?
lldrv_cur->write_load((struct fpga_context*)file->private_data, buf, len)
struct fpga_context *fcur = (struct fpga_context*)file->private_data;
return (fcur->lldrv > -1) ?
lldrv[fcur->lldrv]->write_load(fcur, buf, len)
: -EBUSY;
}
EXPORT_SYMBOL_GPL(fpgafs_write_load);
@ -65,12 +71,63 @@ EXPORT_SYMBOL_GPL(fpgafs_write_load);
ssize_t fpgafs_read_load(struct file *file, char __user *buf,
size_t len, loff_t *pos)
{
return (lldrv_cur) ?
lldrv_cur->read_load((struct fpga_context*)file->private_data, buf, len)
struct fpga_context *fcur = (struct fpga_context*)file->private_data;
return (fcur->lldrv > -1) ?
lldrv[fcur->lldrv]->read_load(fcur, buf, len)
: -EBUSY;
}
EXPORT_SYMBOL_GPL(fpgafs_read_load);
/* set/get current low level driver */
ssize_t fpgafs_read_lldrv(struct file *file, char __user *buf,
size_t len, loff_t *pos)
{
struct fpga_context *fcur = (struct fpga_context*)file->private_data;
size_t l = (len > 5)?5:len;
if (fcur->lldrv > -1) {
if (copy_to_user(buf, lldrv[fcur->lldrv]->name, l))
return -EFAULT;
} else {
return -EBUSY;
}
return l;
}
EXPORT_SYMBOL_GPL(fpgafs_read_lldrv);
ssize_t fpgafs_write_lldrv(struct file *file, const char __user *buf,
size_t len, loff_t *pos)
{
struct fpga_context *fcur = (struct fpga_context*)file->private_data;
u32 cp = 0, i;
u8 __user *usr;
unsigned char tmp[5];
size_t l = (len > 5)?5:len;
/* get name */
while (cp < l) {
usr = (u8*)&buf[cp];
if (__get_user(tmp[cp], usr))
return -EFAULT;
cp++;
}
for(i=0; i < FPGAFS_MAX_LLDRV; i++)
if (lldrv[i] != NULL) {
for (cp = 0; cp < l; cp++) {
if (lldrv[i]->name[cp] != tmp[cp])
break;
}
if (cp == l) {
fcur->lldrv = i;
return l;
}
}
fcur->lldrv = -1;
return -1;
}
EXPORT_SYMBOL_GPL(fpgafs_write_lldrv);
/* low level un-/register functions */
int fpgafs_register_lldrv(struct fpgafs_lldrv *drv)
{
@ -83,15 +140,15 @@ int fpgafs_register_lldrv(struct fpgafs_lldrv *drv)
/* find free space */
for(i=0; i < FPGAFS_MAX_LLDRV; i++)
if (lldrv[lldrv_count] == NULL) {
lldrv[lldrv_count] = drv;
if (lldrv[i] == NULL) {
lldrv[i] = drv;
break;
}
if (lldrv[lldrv_count]->init)
lldrv[lldrv_count]->init();
if (lldrv[i]->init)
lldrv[i]->init();
lldrv_cur = lldrv[lldrv_count];
lldrv_cur = lldrv[i];
lldrv_count++;