mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Zhenzhong Duan](/assets/img/avatar_default.png)
HWRNG_MINOR and RNG_MISCDEV_MINOR are duplicate definitions, use unified HWRNG_MINOR instead and moved into miscdevice.h ANSLCD_MINOR and LCD_MINOR are duplicate definitions, use unified LCD_MINOR instead and moved into miscdevice.h MISCDEV_MINOR is renamed to PXA3XX_GCU_MINOR and moved into miscdevice.h Other definitions are just moved without any change. Link: https://lore.kernel.org/lkml/20200120221323.GJ15860@mit.edu/t/ Suggested-by: Arnd Bergmann <arnd@arndb.de> Build-tested-by: Willy TARREAU <wtarreau@haproxy.com> Build-tested-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@gmail.com> Acked-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Link: https://lore.kernel.org/r/20200311071654.335-2-zhenzhong.duan@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
205 lines
4 KiB
C
205 lines
4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* /dev/lcd driver for Apple Network Servers.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/miscdevice.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/module.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/fs.h>
|
|
|
|
#include <linux/uaccess.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/io.h>
|
|
|
|
#include "ans-lcd.h"
|
|
|
|
#define ANSLCD_ADDR 0xf301c000
|
|
#define ANSLCD_CTRL_IX 0x00
|
|
#define ANSLCD_DATA_IX 0x10
|
|
|
|
static unsigned long anslcd_short_delay = 80;
|
|
static unsigned long anslcd_long_delay = 3280;
|
|
static volatile unsigned char __iomem *anslcd_ptr;
|
|
static DEFINE_MUTEX(anslcd_mutex);
|
|
|
|
#undef DEBUG
|
|
|
|
static void
|
|
anslcd_write_byte_ctrl ( unsigned char c )
|
|
{
|
|
#ifdef DEBUG
|
|
printk(KERN_DEBUG "LCD: CTRL byte: %02x\n",c);
|
|
#endif
|
|
out_8(anslcd_ptr + ANSLCD_CTRL_IX, c);
|
|
switch(c) {
|
|
case 1:
|
|
case 2:
|
|
case 3:
|
|
udelay(anslcd_long_delay); break;
|
|
default: udelay(anslcd_short_delay);
|
|
}
|
|
}
|
|
|
|
static void
|
|
anslcd_write_byte_data ( unsigned char c )
|
|
{
|
|
out_8(anslcd_ptr + ANSLCD_DATA_IX, c);
|
|
udelay(anslcd_short_delay);
|
|
}
|
|
|
|
static ssize_t
|
|
anslcd_write( struct file * file, const char __user * buf,
|
|
size_t count, loff_t *ppos )
|
|
{
|
|
const char __user *p = buf;
|
|
int i;
|
|
|
|
#ifdef DEBUG
|
|
printk(KERN_DEBUG "LCD: write\n");
|
|
#endif
|
|
|
|
if (!access_ok(buf, count))
|
|
return -EFAULT;
|
|
|
|
mutex_lock(&anslcd_mutex);
|
|
for ( i = *ppos; count > 0; ++i, ++p, --count )
|
|
{
|
|
char c;
|
|
__get_user(c, p);
|
|
anslcd_write_byte_data( c );
|
|
}
|
|
mutex_unlock(&anslcd_mutex);
|
|
*ppos = i;
|
|
return p - buf;
|
|
}
|
|
|
|
static long
|
|
anslcd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
char ch, __user *temp;
|
|
long ret = 0;
|
|
|
|
#ifdef DEBUG
|
|
printk(KERN_DEBUG "LCD: ioctl(%d,%d)\n",cmd,arg);
|
|
#endif
|
|
|
|
mutex_lock(&anslcd_mutex);
|
|
|
|
switch ( cmd )
|
|
{
|
|
case ANSLCD_CLEAR:
|
|
anslcd_write_byte_ctrl ( 0x38 );
|
|
anslcd_write_byte_ctrl ( 0x0f );
|
|
anslcd_write_byte_ctrl ( 0x06 );
|
|
anslcd_write_byte_ctrl ( 0x01 );
|
|
anslcd_write_byte_ctrl ( 0x02 );
|
|
break;
|
|
case ANSLCD_SENDCTRL:
|
|
temp = (char __user *) arg;
|
|
__get_user(ch, temp);
|
|
for (; ch; temp++) { /* FIXME: This is ugly, but should work, as a \0 byte is not a valid command code */
|
|
anslcd_write_byte_ctrl ( ch );
|
|
__get_user(ch, temp);
|
|
}
|
|
break;
|
|
case ANSLCD_SETSHORTDELAY:
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
ret =-EACCES;
|
|
else
|
|
anslcd_short_delay=arg;
|
|
break;
|
|
case ANSLCD_SETLONGDELAY:
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
ret = -EACCES;
|
|
else
|
|
anslcd_long_delay=arg;
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
mutex_unlock(&anslcd_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
anslcd_open( struct inode * inode, struct file * file )
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
const struct file_operations anslcd_fops = {
|
|
.write = anslcd_write,
|
|
.unlocked_ioctl = anslcd_ioctl,
|
|
.open = anslcd_open,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
static struct miscdevice anslcd_dev = {
|
|
LCD_MINOR,
|
|
"anslcd",
|
|
&anslcd_fops
|
|
};
|
|
|
|
static const char anslcd_logo[] __initconst =
|
|
"********************" /* Line #1 */
|
|
"* LINUX! *" /* Line #3 */
|
|
"* Welcome to *" /* Line #2 */
|
|
"********************"; /* Line #4 */
|
|
|
|
static int __init
|
|
anslcd_init(void)
|
|
{
|
|
int a;
|
|
int retval;
|
|
struct device_node* node;
|
|
|
|
node = of_find_node_by_name(NULL, "lcd");
|
|
if (!node || !of_node_name_eq(node->parent, "gc")) {
|
|
of_node_put(node);
|
|
return -ENODEV;
|
|
}
|
|
of_node_put(node);
|
|
|
|
anslcd_ptr = ioremap(ANSLCD_ADDR, 0x20);
|
|
|
|
retval = misc_register(&anslcd_dev);
|
|
if(retval < 0){
|
|
printk(KERN_INFO "LCD: misc_register failed\n");
|
|
iounmap(anslcd_ptr);
|
|
return retval;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
printk(KERN_DEBUG "LCD: init\n");
|
|
#endif
|
|
|
|
mutex_lock(&anslcd_mutex);
|
|
anslcd_write_byte_ctrl ( 0x38 );
|
|
anslcd_write_byte_ctrl ( 0x0c );
|
|
anslcd_write_byte_ctrl ( 0x06 );
|
|
anslcd_write_byte_ctrl ( 0x01 );
|
|
anslcd_write_byte_ctrl ( 0x02 );
|
|
for(a=0;a<80;a++) {
|
|
anslcd_write_byte_data(anslcd_logo[a]);
|
|
}
|
|
mutex_unlock(&anslcd_mutex);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit
|
|
anslcd_exit(void)
|
|
{
|
|
misc_deregister(&anslcd_dev);
|
|
iounmap(anslcd_ptr);
|
|
}
|
|
|
|
module_init(anslcd_init);
|
|
module_exit(anslcd_exit);
|
|
MODULE_LICENSE("GPL v2");
|