From: David van Moolenbroek Date: Mon, 2 Sep 2013 23:57:41 +0000 (+0200) Subject: printer: use libchardriver X-Git-Tag: v3.3.0~587 X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/invmod.png?a=commitdiff_plain;h=6e6bb544c61bd90064196075574b22084aedc884;p=minix.git printer: use libchardriver Change-Id: Ifa3cabeada74c32df2613b8279c00f86e831c775 --- diff --git a/drivers/printer/printer.c b/drivers/printer/printer.c index bccc6af48..6b75aadd1 100644 --- a/drivers/printer/printer.c +++ b/drivers/printer/printer.c @@ -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. */ - - int r = OK; - int retries; - u32_t status; - - /* 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. - */ - 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) { +/* The printer is used by sending write requests to it. Process one. */ + 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 */ + + /* 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; + + 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'