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/* $Id: parport_probe.c,v 1.3 1997/10/19 18:18:46 phil Exp $
* Parallel port device probing code
*
* Authors: Carsten Gross, carsten@sol.wohnheim.uni-ulm.de
* Philip Blundell <Philip.Blundell@pobox.com>
*/
#include <linux/tasks.h>
#include <linux/parport.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/malloc.h>
#include <linux/ctype.h>
#include <linux/module.h>
#include <linux/lp.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/uaccess.h>
#undef DEBUG_PROBE
static inline int read_nibble(struct parport *port)
{
unsigned char i;
i = parport_read_status(port)>>3;
i &= ~8;
if ((i & 0x10) == 0) i |= 8;
return (i & 0x0f);
}
static void read_terminate(struct parport *port) {
parport_write_control(port, (parport_read_control(port) & ~2) | 8);
/* SelectIN high, AutoFeed low */
if (parport_wait_peripheral(port, 0x80, 0))
/* timeout, SelectIN high, Autofeed low */
return;
parport_write_control(port, parport_read_control(port) | 2);
/* AutoFeed high */
parport_wait_peripheral(port, 0x80, 0x80);
/* no timeout possible, Autofeed low, SelectIN high */
parport_write_control(port, (parport_read_control(port) & ~2) | 8);
}
static long read_polled(struct parport *port, char *buf,
unsigned long length)
{
int i;
char *temp=buf;
unsigned int count = 0;
unsigned char z=0;
unsigned char Byte=0;
unsigned long igiveupat=jiffies+5*HZ;
for (i=0; time_before(jiffies, igiveupat); i++) {
/* if(current->need_resched) schedule(); */
parport_write_control(port, parport_read_control(port) | 2); /* AutoFeed high */
if (parport_wait_peripheral(port, 0x40, 0)) {
#ifdef DEBUG_PROBE
/* Some peripherals just time out when they've sent
all their data. */
printk("%s: read1 timeout.\n", port->name);
#endif
parport_write_control(port, parport_read_control(port) & ~2);
break;
}
z = read_nibble(port);
parport_write_control(port, parport_read_control(port) & ~2); /* AutoFeed low */
if (parport_wait_peripheral(port, 0x40, 0x40)) {
printk("%s: read2 timeout.\n", port->name);
break;
}
if ((i & 1) != 0) {
Byte |= (z<<4);
if (temp)
*(temp++) = Byte;
if (++count == length)
temp = NULL;
/* Does the error line indicate end of data? */
if ((parport_read_status(port) & LP_PERRORP) ==
LP_PERRORP)
break;
} else
Byte=z;
}
read_terminate(port);
return count;
}
int parport_probe(struct parport *port, char *buffer, int len)
{
struct pardevice *dev = parport_register_device(port, "IEEE 1284 probe", NULL, NULL, NULL, 0, &dev);
int result = 0;
if (!dev) {
printk("%s: unable to register for probe.\n", port->name);
return -EINVAL;
}
parport_claim_or_block(dev);
switch (parport_ieee1284_nibble_mode_ok(port, 4)) {
case 2:
current->state=TASK_INTERRUPTIBLE;
/* HACK: wait 10ms because printer seems to ack wrong */
schedule_timeout((HZ+99)/100);
result = read_polled(port, buffer, len);
break;
default:
result = -EIO;
break;
}
parport_release(dev);
parport_unregister_device(dev);
return result;
}
static struct {
char *token;
char *descr;
} classes[] = {
{ "", "Legacy device" },
{ "PRINTER", "Printer" },
{ "MODEM", "Modem" },
{ "NET", "Network device" },
{ "HDC", "Hard disk" },
{ "PCMCIA", "PCMCIA" },
{ "MEDIA", "Multimedia device" },
{ "FDC", "Floppy disk" },
{ "PORTS", "Ports" },
{ "SCANNER", "Scanner" },
{ "DIGICAM", "Digital camera" },
{ "", "Unknown device" },
{ "", "Unspecified" },
{ NULL, NULL }
};
static char *strdup(char *str)
{
int n = strlen(str)+1;
char *s = kmalloc(n, GFP_KERNEL);
if (!s) return NULL;
return strcpy(s, str);
}
static void parse_data(struct parport *port, char *str)
{
char *txt = kmalloc(strlen(str)+1, GFP_KERNEL);
char *p = txt, *q;
int guessed_class = PARPORT_CLASS_UNSPEC;
if (!txt) {
printk("%s probe: memory squeeze\n", port->name);
return;
}
strcpy(txt, str);
while (p) {
char *sep;
q = strchr(p, ';');
if (q) *q = 0;
sep = strchr(p, ':');
if (sep) {
char *u = p;
*(sep++) = 0;
while (*u) {
*u = toupper(*u);
u++;
}
if (!strcmp(p, "MFG") || !strcmp(p, "MANUFACTURER")) {
if (port->probe_info.mfr)
kfree (port->probe_info.mfr);
port->probe_info.mfr = strdup(sep);
} else if (!strcmp(p, "MDL") || !strcmp(p, "MODEL")) {
if (port->probe_info.model)
kfree (port->probe_info.model);
port->probe_info.model = strdup(sep);
} else if (!strcmp(p, "CLS") || !strcmp(p, "CLASS")) {
int i;
if (port->probe_info.class_name)
kfree (port->probe_info.class_name);
port->probe_info.class_name = strdup(sep);
for (u = sep; *u; u++)
*u = toupper(*u);
for (i = 0; classes[i].token; i++) {
if (!strcmp(classes[i].token, sep)) {
port->probe_info.class = i;
goto rock_on;
}
}
printk(KERN_WARNING "%s probe: warning, class '%s' not understood.\n", port->name, sep);
port->probe_info.class = PARPORT_CLASS_OTHER;
} else if (!strcmp(p, "CMD") || !strcmp(p, "COMMAND SET")) {
if (port->probe_info.cmdset)
kfree (port->probe_info.cmdset);
port->probe_info.cmdset = strdup(sep);
/* if it speaks printer language, it's
probably a printer */
if (strstr(sep, "PJL") || strstr(sep, "PCL"))
guessed_class = PARPORT_CLASS_PRINTER;
} else if (!strcmp(p, "DES") || !strcmp(p, "DESCRIPTION")) {
if (port->probe_info.description)
kfree (port->probe_info.description);
port->probe_info.description = strdup(sep);
}
}
rock_on:
if (q) p = q+1; else p=NULL;
}
/* If the device didn't tell us its class, maybe we have managed to
guess one from the things it did say. */
if (port->probe_info.class == PARPORT_CLASS_UNSPEC)
port->probe_info.class = guessed_class;
kfree(txt);
}
static void pretty_print(struct parport *port)
{
printk(KERN_INFO "%s: %s", port->name,
classes[port->probe_info.class].descr);
if (port->probe_info.class) {
printk(", %s %s", port->probe_info.mfr,
port->probe_info.model);
}
printk("\n");
}
void parport_probe_one(struct parport *port)
{
char *buffer = kmalloc(2048, GFP_KERNEL);
int r;
MOD_INC_USE_COUNT;
port->probe_info.model = strdup ("Unknown device");
port->probe_info.mfr = strdup ("Unknown vendor");
port->probe_info.description = port->probe_info.cmdset = NULL;
port->probe_info.class = PARPORT_CLASS_UNSPEC;
port->probe_info.class_name = NULL;
if (!buffer) {
printk(KERN_ERR "%s probe: Memory squeeze.\n", port->name);
return;
}
r = parport_probe(port, buffer, 2047);
if (r < 0) {
printk(KERN_INFO "%s: no IEEE-1284 device present.\n",
port->name);
port->probe_info.class = PARPORT_CLASS_LEGACY;
} else if (r == 0) {
printk(KERN_INFO "%s: no ID data returned by device.\n",
port->name);
} else {
buffer[r] = 0;
#ifdef DEBUG_PROBE
printk("%s id: %s\n", port->name, buffer+2);
#endif
parse_data(port, buffer+2);
pretty_print(port);
}
kfree(buffer);
MOD_DEC_USE_COUNT;
}
#if MODULE
int init_module(void)
{
struct parport *p;
for (p = parport_enumerate(); p; p = p->next)
parport_probe_one(p);
parport_probe_hook = &parport_probe_one;
return 0;
}
void cleanup_module(void)
{
parport_probe_hook = NULL;
}
#endif
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