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printer: use libchardriver

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Change-Id: Ifa3cabeada74c32df2613b8279c00f86e831c775
This commit is contained in:
David van Moolenbroek 2013-09-03 01:57:41 +02:00 committed by Lionel Sambuc
parent 597151d963
commit 6e6bb544c6
1 changed files with 90 additions and 133 deletions
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223
drivers/printer/printer.c
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@ -91,22 +91,23 @@ static unsigned char obuf[128]; /* output buffer */
static unsigned const char *optr; /* ptr to next char in obuf to print */
static int orig_count; /* original byte count */
static int port_base; /* I/O port for printer */
static endpoint_t proc_nr; /* user requesting the printing */
static cp_grant_id_t grant_nr; /* grant on which print happens */
static int user_left; /* bytes of output left in user buf */
static vir_bytes user_vir_d; /* offset in user buf */
int writing; /* nonzero while write is in progress */
static cdev_id_t write_id; /* request ID of ongoing write */
static int irq_hook_id; /* id of irq hook at kernel */
static void do_cancel(message *m_ptr);
static void output_done(void);
static void do_write(message *m_ptr);
static void prepare_output(void);
static int do_probe(void);
static void do_initialize(void);
static void reply(int code, endpoint_t replyee, endpoint_t proc,
cp_grant_id_t grant, int status);
static void do_printer_output(void);
static int printer_open(devminor_t minor, int access, endpoint_t user_endpt);
static ssize_t printer_write(devminor_t minor, u64_t position,
endpoint_t endpt, cp_grant_id_t grant, size_t size, int flags,
cdev_id_t id);
static int printer_cancel(devminor_t minor, endpoint_t endpt, cdev_id_t id);
static void printer_intr(unsigned int mask);
/* SEF functions and variables. */
static void sef_local_startup(void);
@ -115,49 +116,25 @@ EXTERN int sef_cb_lu_prepare(int state);
EXTERN int sef_cb_lu_state_isvalid(int state);
EXTERN void sef_cb_lu_state_dump(int state);
/* Entry points to this driver. */
static struct chardriver printer_tab = {
.cdr_open = printer_open,
.cdr_write = printer_write,
.cdr_cancel = printer_cancel,
.cdr_intr = printer_intr
};
/*===========================================================================*
* printer_task *
*===========================================================================*/
int main(void)
{
/* Main routine of the printer task. */
message pr_mess; /* buffer for all incoming messages */
int ipc_status;
/* SEF local startup. */
sef_local_startup();
while (TRUE) {
if(driver_receive(ANY, &pr_mess, &ipc_status) != OK) {
panic("driver_receive failed");
}
if (is_ipc_notify(ipc_status)) {
switch (_ENDPOINT_P(pr_mess.m_source)) {
case HARDWARE:
do_printer_output();
break;
}
continue;
}
switch(pr_mess.m_type) {
case DEV_OPEN:
do_initialize(); /* initialize */
reply(DEV_OPEN_REPL, pr_mess.m_source, pr_mess.USER_ENDPT,
(cp_grant_id_t) pr_mess.IO_GRANT, OK);
break;
case DEV_CLOSE:
reply(DEV_CLOSE_REPL, pr_mess.m_source, pr_mess.USER_ENDPT,
(cp_grant_id_t) pr_mess.IO_GRANT, OK);
break;
case DEV_WRITE_S: do_write(&pr_mess); break;
case CANCEL: do_cancel(&pr_mess); break;
default:
reply(DEV_REVIVE, pr_mess.m_source, pr_mess.USER_ENDPT,
(cp_grant_id_t) pr_mess.IO_GRANT, EINVAL);
}
}
chardriver_task(&printer_tab);
}
/*===========================================================================*
@ -202,54 +179,49 @@ static int sef_cb_init_fresh(int UNUSED(type), sef_init_info_t *UNUSED(info))
/*===========================================================================*
* do_write *
*===========================================================================*/
static void do_write(m_ptr)
register message *m_ptr; /* pointer to the newly arrived message */
static ssize_t printer_write(devminor_t UNUSED(minor), u64_t UNUSED(position),
endpoint_t endpt, cp_grant_id_t grant, size_t size, int flags,
cdev_id_t id)
{
/* The printer is used by sending DEV_WRITE messages to it. Process one. */
/* The printer is used by sending write requests to it. Process one. */
int retries;
u32_t status;
int r = OK;
int retries;
u32_t status;
/* Reject command if last write is not yet finished, the count is not
* positive, or we're asked not to block.
*/
if (writing) return EIO;
if (size <= 0) return EINVAL;
if (flags & FLG_OP_NONBLOCK) return EAGAIN; /* not supported */
/* Reject command if last write is not yet finished, the count is not
* positive, or the user address is bad.
*/
if (writing) r = EIO;
else if (m_ptr->COUNT <= 0) r = EINVAL;
else if (m_ptr->FLAGS & FLG_OP_NONBLOCK) r = EAGAIN; /* not supported */
/* If no errors occurred, continue printing with the caller.
* First wait until the printer is online to prevent stupid errors.
*/
caller = endpt;
user_left = size;
orig_count = size;
user_vir_d = 0; /* Offset. */
writing = TRUE;
grant_nr = grant;
write_id = id;
/* If no errors occurred, continue printing with the caller.
* First wait until the printer is online to prevent stupid errors.
*/
if (r == OK) {
caller = m_ptr->m_source;
proc_nr = m_ptr->USER_ENDPT;
user_left = m_ptr->COUNT;
orig_count = m_ptr->COUNT;
user_vir_d = 0; /* Offset. */
writing = TRUE;
grant_nr = (cp_grant_id_t) m_ptr->IO_GRANT;
retries = MAX_ONLINE_RETRIES + 1;
while (--retries > 0) {
if(sys_inb(port_base + 1, &status) != OK) {
retries = MAX_ONLINE_RETRIES + 1;
while (--retries > 0) {
if (sys_inb(port_base + 1, &status) != OK) {
printf("printer: sys_inb of %x failed\n", port_base+1);
panic("sys_inb failed");
}
if ((status & ON_LINE)) { /* printer online! */
prepare_output();
do_printer_output();
return;
}
micro_delay(500000); /* wait before retry */
}
/* If we reach this point, the printer was not online in time. */
done_status = status;
output_done();
} else {
reply(DEV_REVIVE, m_ptr->m_source, m_ptr->USER_ENDPT,
(cp_grant_id_t) m_ptr->IO_GRANT, r);
}
}
if (status & ON_LINE) { /* printer online! */
prepare_output();
printer_intr(0);
return EDONTREPLY; /* we may already have sent a reply */
}
micro_delay(500000); /* wait before retry */
}
/* If we reach this point, the printer was not online in time. */
done_status = status;
output_done();
return EDONTREPLY;
}
/*===========================================================================*
@ -260,12 +232,11 @@ static void output_done()
/* Previous chunk of printing is finished. Continue if OK and more.
* Otherwise, reply to caller (FS).
*/
register int status;
message m;
int status;
if (!writing) return; /* probably leftover interrupt */
if (done_status != OK) { /* printer error occurred */
status = EIO;
if (!writing) return; /* probably leftover interrupt */
if (done_status != OK) { /* printer error occurred */
status = EIO;
if ((done_status & ON_LINE) == 0) {
printf("Printer is not on line\n");
} else if ((done_status & NO_PAPER)) {
@ -279,64 +250,36 @@ static void output_done()
status = orig_count - user_left;
}
oleft = 0; /* cancel further output */
}
else if (user_left != 0) { /* not yet done, continue! */
} else if (user_left != 0) { /* not yet done, continue! */
prepare_output();
return;
}
else { /* done! report back to FS */
} else { /* done! report back to FS */
status = orig_count;
}
}
memset(&m, 0, sizeof(m));
m.m_type = DEV_REVIVE; /* build message */
m.REP_ENDPT = proc_nr;
m.REP_STATUS = status;
m.REP_IO_GRANT = grant_nr;
send(caller, &m);
chardriver_reply_task(caller, write_id, status);
writing = FALSE; /* unmark event */
writing = FALSE; /* unmark event */
}
/*===========================================================================*
* do_cancel *
* printer_cancel *
*===========================================================================*/
static void do_cancel(m_ptr)
register message *m_ptr; /* pointer to the newly arrived message */
static int printer_cancel(devminor_t UNUSED(minor), endpoint_t endpt,
cdev_id_t id)
{
/* Cancel a print request that has already started. Usually this means that
* the process doing the printing has been killed by a signal. It is not
* clear if there are race conditions. Try not to cancel the wrong process,
* but rely on FS to handle the EINTR reply and de-suspension properly.
* but rely on VFS to handle the EINTR reply and de-suspension properly.
*/
if (writing && m_ptr->USER_ENDPT == proc_nr &&
(cp_grant_id_t) m_ptr->IO_GRANT == grant_nr) {
if (writing && caller == endpt && write_id == id) {
oleft = 0; /* cancel output by interrupt handler */
writing = FALSE;
reply(DEV_REVIVE, m_ptr->m_source, proc_nr, grant_nr, EINTR);
return EINTR;
}
}
/*===========================================================================*
* reply *
*===========================================================================*/
static void reply(code, replyee, process, grant, status)
int code; /* DEV_OPEN_REPL, DEV_CLOSE_REPL, DEV_REVIVE */
endpoint_t replyee; /* destination for message (normally FS) */
endpoint_t process; /* which user requested the printing */
cp_grant_id_t grant; /* which grant was involved */
int status; /* number of chars printed or error code */
{
/* Send a reply telling FS that printing has started or stopped. */
message pr_mess;
pr_mess.m_type = code; /* reply code */
pr_mess.REP_STATUS = status; /* count or EIO */
pr_mess.REP_ENDPT = process; /* which user does this pertain to */
pr_mess.REP_IO_GRANT = grant; /* the grant */
send(replyee, &pr_mess); /* send the message */
return EDONTREPLY;
}
/*===========================================================================*
@ -348,7 +291,7 @@ static int do_probe(void)
/* Get the base port for first printer. */
if(sys_readbios(LPT1_IO_PORT_ADDR, &port_base, LPT1_IO_PORT_SIZE) != OK) {
panic("do_initialize: sys_readbios failed");
panic("do_probe: sys_readbios failed");
}
/* If the port is zero, the parallel port is not available at all. */
@ -361,10 +304,6 @@ static int do_probe(void)
static void do_initialize()
{
/* Set global variables and initialize the printer. */
static int initialized = FALSE;
if (initialized) return;
initialized = TRUE;
if(sys_outb(port_base + 2, INIT_PRINTER) != OK) {
printf("printer: sys_outb of %x failed\n", port_base+2);
panic("do_initialize: sys_outb init failed");
@ -381,6 +320,24 @@ static void do_initialize()
}
}
/*==========================================================================*
* printer_open *
*==========================================================================*/
static int printer_open(devminor_t UNUSED(minor), int UNUSED(access),
endpoint_t UNUSED(user_endpt))
{
/* Initialize on first open. */
static int initialized = FALSE;
if (!initialized) {
do_initialize();
initialized = TRUE;
}
return OK;
}
/*==========================================================================*
* prepare_output *
*==========================================================================*/
@ -405,9 +362,9 @@ static void prepare_output()
}
/*===========================================================================*
* do_printer_output *
* printer_intr *
*===========================================================================*/
static void do_printer_output()
static void printer_intr(unsigned int UNUSED(mask))
{
/* This function does the actual output to the printer. This is called on an
* interrupt message sent from the generic interrupt handler that 'forwards'