[deliverable/linux.git] / drivers / macintosh / ans-lcd.c

/*
 * /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/init.h>
#include <linux/delay.h>
#include <linux/fs.h>

#include <asm/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;

#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(VERIFY_READ, buf, count))
		return -EFAULT;
	for ( i = *ppos; count > 0; ++i, ++p, --count ) 
	{
		char c;
		__get_user(c, p);
		anslcd_write_byte_data( c );
	}
	*ppos = i;
	return p - buf;
}

static int
anslcd_ioctl( struct inode * inode, struct file * file,
				unsigned int cmd, unsigned long arg )
{
	char ch, __user *temp;

#ifdef DEBUG
	printk(KERN_DEBUG "LCD: ioctl(%d,%d)\n",cmd,arg);
#endif

	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 );
		return 0;
	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);
		}
		return 0;
	case ANSLCD_SETSHORTDELAY:
		if (!capable(CAP_SYS_ADMIN))
			return -EACCES;
		anslcd_short_delay=arg;
		return 0;
	case ANSLCD_SETLONGDELAY:
		if (!capable(CAP_SYS_ADMIN))
			return -EACCES;
		anslcd_long_delay=arg;
		return 0;
	default:
		return -EINVAL;
	}
}

static int
anslcd_open( struct inode * inode, struct file * file )
{
	return 0;
}

const struct file_operations anslcd_fops = {
	.write	= anslcd_write,
	.ioctl	= anslcd_ioctl,
	.open	= anslcd_open,
};

static struct miscdevice anslcd_dev = {
	ANSLCD_MINOR,
	"anslcd",
	&anslcd_fops
};

const char anslcd_logo[] =	"********************"  /* 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 || !node->parent || strcmp(node->parent->name, "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

	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]);
	}
	return 0;
}

static void __exit
anslcd_exit(void)
{
	misc_deregister(&anslcd_dev);
	iounmap(anslcd_ptr);
}

module_init(anslcd_init);
module_exit(anslcd_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* /dev/lcd driver for Apple Network Servers.
	3	*/
	4
	5	#include <linux/types.h>
	6	#include <linux/errno.h>
	7	#include <linux/kernel.h>
	8	#include <linux/miscdevice.h>
	9	#include <linux/fcntl.h>
	10	#include <linux/init.h>
	11	#include <linux/delay.h>
	12	#include <linux/fs.h>
	13
	14	#include <asm/uaccess.h>
	15	#include <asm/sections.h>
	16	#include <asm/prom.h>
1da177e4 LT	17	#include <asm/io.h>
1da177e4 LT	18
33d71d26 KG	19	#include "ans-lcd.h"
33d71d26 KG	20
1da177e4 LT	21	#define ANSLCD_ADDR 0xf301c000
	22	#define ANSLCD_CTRL_IX 0x00
	23	#define ANSLCD_DATA_IX 0x10
	24
	25	static unsigned long anslcd_short_delay = 80;
	26	static unsigned long anslcd_long_delay = 3280;
	27	static volatile unsigned char __iomem *anslcd_ptr;
	28
	29	#undef DEBUG
	30
aacaf9bd	31	static void
1da177e4 LT	32	anslcd_write_byte_ctrl ( unsigned char c )
	33	{
	34	#ifdef DEBUG
	35	printk(KERN_DEBUG "LCD: CTRL byte: %02x\n",c);
	36	#endif
	37	out_8(anslcd_ptr + ANSLCD_CTRL_IX, c);
	38	switch(c) {
	39	case 1:
	40	case 2:
	41	case 3:
	42	udelay(anslcd_long_delay); break;
	43	default: udelay(anslcd_short_delay);
	44	}
	45	}
	46
aacaf9bd	47	static void
1da177e4 LT	48	anslcd_write_byte_data ( unsigned char c )
	49	{
	50	out_8(anslcd_ptr + ANSLCD_DATA_IX, c);
	51	udelay(anslcd_short_delay);
	52	}
	53
aacaf9bd	54	static ssize_t
1da177e4 LT	55	anslcd_write( struct file * file, const char __user * buf,
	56	size_t count, loff_t *ppos )
	57	{
	58	const char __user *p = buf;
	59	int i;
	60
	61	#ifdef DEBUG
	62	printk(KERN_DEBUG "LCD: write\n");
	63	#endif
	64
	65	if (!access_ok(VERIFY_READ, buf, count))
	66	return -EFAULT;
	67	for ( i = *ppos; count > 0; ++i, ++p, --count )
	68	{
	69	char c;
	70	__get_user(c, p);
	71	anslcd_write_byte_data( c );
	72	}
	73	*ppos = i;
	74	return p - buf;
	75	}
	76
aacaf9bd	77	static int
1da177e4 LT	78	anslcd_ioctl( struct inode * inode, struct file * file,
	79	unsigned int cmd, unsigned long arg )
	80	{
	81	char ch, __user *temp;
	82
	83	#ifdef DEBUG
	84	printk(KERN_DEBUG "LCD: ioctl(%d,%d)\n",cmd,arg);
	85	#endif
	86
	87	switch ( cmd )
	88	{
	89	case ANSLCD_CLEAR:
	90	anslcd_write_byte_ctrl ( 0x38 );
	91	anslcd_write_byte_ctrl ( 0x0f );
	92	anslcd_write_byte_ctrl ( 0x06 );
	93	anslcd_write_byte_ctrl ( 0x01 );
	94	anslcd_write_byte_ctrl ( 0x02 );
	95	return 0;
	96	case ANSLCD_SENDCTRL:
	97	temp = (char __user *) arg;
	98	__get_user(ch, temp);
	99	for (; ch; temp++) { /* FIXME: This is ugly, but should work, as a \0 byte is not a valid command code */
	100	anslcd_write_byte_ctrl ( ch );
	101	__get_user(ch, temp);
	102	}
	103	return 0;
	104	case ANSLCD_SETSHORTDELAY:
	105	if (!capable(CAP_SYS_ADMIN))
	106	return -EACCES;
	107	anslcd_short_delay=arg;
	108	return 0;
	109	case ANSLCD_SETLONGDELAY:
	110	if (!capable(CAP_SYS_ADMIN))
	111	return -EACCES;
	112	anslcd_long_delay=arg;
	113	return 0;
	114	default:
	115	return -EINVAL;
	116	}
	117	}
	118
aacaf9bd	119	static int
1da177e4 LT	120	anslcd_open( struct inode * inode, struct file * file )
	121	{
	122	return 0;
	123	}
	124
fa027c2a	125	const struct file_operations anslcd_fops = {
1da177e4 LT	126	.write = anslcd_write,
	127	.ioctl = anslcd_ioctl,
	128	.open = anslcd_open,
	129	};
	130
	131	static struct miscdevice anslcd_dev = {
	132	ANSLCD_MINOR,
	133	"anslcd",
	134	&anslcd_fops
	135	};
	136
	137	const char anslcd_logo[] = "*******************" / Line #1 */
	138	"* LINUX! " / Line #3 */
	139	"* Welcome to " / Line #2 */
	140	"*******************"; / Line #4 */
	141
	142	static int __init
	143	anslcd_init(void)
	144	{
	145	int a;
	146	int retval;
	147	struct device_node* node;
	148
30686ba6 SR	149	node = of_find_node_by_name(NULL, "lcd");
	150	if (!node \|\| !node->parent \|\| strcmp(node->parent->name, "gc")) {
	151	of_node_put(node);
1da177e4	152	return -ENODEV;
30686ba6 SR	153	}
30686ba6 SR	154	of_node_put(node);
1da177e4 LT	155
	156	anslcd_ptr = ioremap(ANSLCD_ADDR, 0x20);
	157
	158	retval = misc_register(&anslcd_dev);
	159	if(retval < 0){
	160	printk(KERN_INFO "LCD: misc_register failed\n");
	161	iounmap(anslcd_ptr);
	162	return retval;
	163	}
	164
	165	#ifdef DEBUG
	166	printk(KERN_DEBUG "LCD: init\n");
	167	#endif
	168
	169	anslcd_write_byte_ctrl ( 0x38 );
	170	anslcd_write_byte_ctrl ( 0x0c );
	171	anslcd_write_byte_ctrl ( 0x06 );
	172	anslcd_write_byte_ctrl ( 0x01 );
	173	anslcd_write_byte_ctrl ( 0x02 );
	174	for(a=0;a<80;a++) {
	175	anslcd_write_byte_data(anslcd_logo[a]);
	176	}
	177	return 0;
	178	}
	179
	180	static void __exit
	181	anslcd_exit(void)
	182	{
	183	misc_deregister(&anslcd_dev);
	184	iounmap(anslcd_ptr);
	185	}
	186
	187	module_init(anslcd_init);
	188	module_exit(anslcd_exit);