paride.c
资源名称:block.rar [点击查看]
上传用户:ajay2009
上传日期:2009-05-22
资源大小:495k
文件大小:9k
源码类别:
驱动编程
开发平台:
Unix_Linux
- /*
- paride.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
- Under the terms of the GNU General Public License.
- This is the base module for the family of device drivers
- that support parallel port IDE devices.
- */
- /* Changes:
- 1.01 GRG 1998.05.03 Use spinlocks
- 1.02 GRG 1998.05.05 init_proto, release_proto, ktti
- 1.03 GRG 1998.08.15 eliminate compiler warning
- 1.04 GRG 1998.11.28 added support for FRIQ
- 1.05 TMW 2000.06.06 use parport_find_number instead of
- parport_enumerate
- 1.06 TMW 2001.03.26 more sane parport-or-not resource management
- */
- #define PI_VERSION "1.06"
- #include <linux/module.h>
- #include <linux/config.h>
- #include <linux/kmod.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/ioport.h>
- #include <linux/string.h>
- #include <linux/spinlock.h>
- #include <linux/wait.h>
- #ifdef CONFIG_PARPORT_MODULE
- #define CONFIG_PARPORT
- #endif
- #ifdef CONFIG_PARPORT
- #include <linux/parport.h>
- #endif
- #include "paride.h"
- MODULE_LICENSE("GPL");
- #define MAX_PROTOS 32
- static struct pi_protocol *protocols[MAX_PROTOS];
- static DEFINE_SPINLOCK(pi_spinlock);
- void pi_write_regr(PIA * pi, int cont, int regr, int val)
- {
- pi->proto->write_regr(pi, cont, regr, val);
- }
- EXPORT_SYMBOL(pi_write_regr);
- int pi_read_regr(PIA * pi, int cont, int regr)
- {
- return pi->proto->read_regr(pi, cont, regr);
- }
- EXPORT_SYMBOL(pi_read_regr);
- void pi_write_block(PIA * pi, char *buf, int count)
- {
- pi->proto->write_block(pi, buf, count);
- }
- EXPORT_SYMBOL(pi_write_block);
- void pi_read_block(PIA * pi, char *buf, int count)
- {
- pi->proto->read_block(pi, buf, count);
- }
- EXPORT_SYMBOL(pi_read_block);
- #ifdef CONFIG_PARPORT
- static void pi_wake_up(void *p)
- {
- PIA *pi = (PIA *) p;
- unsigned long flags;
- void (*cont) (void) = NULL;
- spin_lock_irqsave(&pi_spinlock, flags);
- if (pi->claim_cont && !parport_claim(pi->pardev)) {
- cont = pi->claim_cont;
- pi->claim_cont = NULL;
- pi->claimed = 1;
- }
- spin_unlock_irqrestore(&pi_spinlock, flags);
- wake_up(&(pi->parq));
- if (cont)
- cont();
- }
- #endif
- int pi_schedule_claimed(PIA * pi, void (*cont) (void))
- {
- #ifdef CONFIG_PARPORT
- unsigned long flags;
- spin_lock_irqsave(&pi_spinlock, flags);
- if (pi->pardev && parport_claim(pi->pardev)) {
- pi->claim_cont = cont;
- spin_unlock_irqrestore(&pi_spinlock, flags);
- return 0;
- }
- pi->claimed = 1;
- spin_unlock_irqrestore(&pi_spinlock, flags);
- #endif
- return 1;
- }
- EXPORT_SYMBOL(pi_schedule_claimed);
- void pi_do_claimed(PIA * pi, void (*cont) (void))
- {
- if (pi_schedule_claimed(pi, cont))
- cont();
- }
- EXPORT_SYMBOL(pi_do_claimed);
- static void pi_claim(PIA * pi)
- {
- if (pi->claimed)
- return;
- pi->claimed = 1;
- #ifdef CONFIG_PARPORT
- if (pi->pardev)
- wait_event(pi->parq,
- !parport_claim((struct pardevice *) pi->pardev));
- #endif
- }
- static void pi_unclaim(PIA * pi)
- {
- pi->claimed = 0;
- #ifdef CONFIG_PARPORT
- if (pi->pardev)
- parport_release((struct pardevice *) (pi->pardev));
- #endif
- }
- void pi_connect(PIA * pi)
- {
- pi_claim(pi);
- pi->proto->connect(pi);
- }
- EXPORT_SYMBOL(pi_connect);
- void pi_disconnect(PIA * pi)
- {
- pi->proto->disconnect(pi);
- pi_unclaim(pi);
- }
- EXPORT_SYMBOL(pi_disconnect);
- static void pi_unregister_parport(PIA * pi)
- {
- #ifdef CONFIG_PARPORT
- if (pi->pardev) {
- parport_unregister_device((struct pardevice *) (pi->pardev));
- pi->pardev = NULL;
- }
- #endif
- }
- void pi_release(PIA * pi)
- {
- pi_unregister_parport(pi);
- #ifndef CONFIG_PARPORT
- if (pi->reserved)
- release_region(pi->port, pi->reserved);
- #endif /* !CONFIG_PARPORT */
- if (pi->proto->release_proto)
- pi->proto->release_proto(pi);
- module_put(pi->proto->owner);
- }
- EXPORT_SYMBOL(pi_release);
- static int default_test_proto(PIA * pi, char *scratch, int verbose)
- {
- int j, k;
- int e[2] = { 0, 0 };
- pi->proto->connect(pi);
- for (j = 0; j < 2; j++) {
- pi_write_regr(pi, 0, 6, 0xa0 + j * 0x10);
- for (k = 0; k < 256; k++) {
- pi_write_regr(pi, 0, 2, k ^ 0xaa);
- pi_write_regr(pi, 0, 3, k ^ 0x55);
- if (pi_read_regr(pi, 0, 2) != (k ^ 0xaa))
- e[j]++;
- }
- }
- pi->proto->disconnect(pi);
- if (verbose)
- printk("%s: %s: port 0x%x, mode %d, test=(%d,%d)n",
- pi->device, pi->proto->name, pi->port,
- pi->mode, e[0], e[1]);
- return (e[0] && e[1]); /* not here if both > 0 */
- }
- static int pi_test_proto(PIA * pi, char *scratch, int verbose)
- {
- int res;
- pi_claim(pi);
- if (pi->proto->test_proto)
- res = pi->proto->test_proto(pi, scratch, verbose);
- else
- res = default_test_proto(pi, scratch, verbose);
- pi_unclaim(pi);
- return res;
- }
- int pi_register(PIP * pr)
- {
- int k;
- for (k = 0; k < MAX_PROTOS; k++)
- if (protocols[k] && !strcmp(pr->name, protocols[k]->name)) {
- printk("paride: %s protocol already registeredn",
- pr->name);
- return 0;
- }
- k = 0;
- while ((k < MAX_PROTOS) && (protocols[k]))
- k++;
- if (k == MAX_PROTOS) {
- printk("paride: protocol table fulln");
- return 0;
- }
- protocols[k] = pr;
- pr->index = k;
- printk("paride: %s registered as protocol %dn", pr->name, k);
- return 1;
- }
- EXPORT_SYMBOL(pi_register);
- void pi_unregister(PIP * pr)
- {
- if (!pr)
- return;
- if (protocols[pr->index] != pr) {
- printk("paride: %s not registeredn", pr->name);
- return;
- }
- protocols[pr->index] = NULL;
- }
- EXPORT_SYMBOL(pi_unregister);
- static int pi_register_parport(PIA * pi, int verbose)
- {
- #ifdef CONFIG_PARPORT
- struct parport *port;
- port = parport_find_base(pi->port);
- if (!port)
- return 0;
- pi->pardev = parport_register_device(port,
- pi->device, NULL,
- pi_wake_up, NULL, 0, (void *) pi);
- parport_put_port(port);
- if (!pi->pardev)
- return 0;
- init_waitqueue_head(&pi->parq);
- if (verbose)
- printk("%s: 0x%x is %sn", pi->device, pi->port, port->name);
- pi->parname = (char *) port->name;
- #endif
- return 1;
- }
- static int pi_probe_mode(PIA * pi, int max, char *scratch, int verbose)
- {
- int best, range;
- if (pi->mode != -1) {
- if (pi->mode >= max)
- return 0;
- range = 3;
- if (pi->mode >= pi->proto->epp_first)
- range = 8;
- if ((range == 8) && (pi->port % 8))
- return 0;
- pi->reserved = range;
- return (!pi_test_proto(pi, scratch, verbose));
- }
- best = -1;
- for (pi->mode = 0; pi->mode < max; pi->mode++) {
- range = 3;
- if (pi->mode >= pi->proto->epp_first)
- range = 8;
- if ((range == 8) && (pi->port % 8))
- break;
- pi->reserved = range;
- if (!pi_test_proto(pi, scratch, verbose))
- best = pi->mode;
- }
- pi->mode = best;
- return (best > -1);
- }
- static int pi_probe_unit(PIA * pi, int unit, char *scratch, int verbose)
- {
- int max, s, e;
- s = unit;
- e = s + 1;
- if (s == -1) {
- s = 0;
- e = pi->proto->max_units;
- }
- if (!pi_register_parport(pi, verbose))
- return 0;
- if (pi->proto->test_port) {
- pi_claim(pi);
- max = pi->proto->test_port(pi);
- pi_unclaim(pi);
- } else
- max = pi->proto->max_mode;
- if (pi->proto->probe_unit) {
- pi_claim(pi);
- for (pi->unit = s; pi->unit < e; pi->unit++)
- if (pi->proto->probe_unit(pi)) {
- pi_unclaim(pi);
- if (pi_probe_mode(pi, max, scratch, verbose))
- return 1;
- pi_unregister_parport(pi);
- return 0;
- }
- pi_unclaim(pi);
- pi_unregister_parport(pi);
- return 0;
- }
- if (!pi_probe_mode(pi, max, scratch, verbose)) {
- pi_unregister_parport(pi);
- return 0;
- }
- return 1;
- }
- int pi_init(PIA * pi, int autoprobe, int port, int mode,
- int unit, int protocol, int delay, char *scratch,
- int devtype, int verbose, char *device)
- {
- int p, k, s, e;
- int lpts[7] = { 0x3bc, 0x378, 0x278, 0x268, 0x27c, 0x26c, 0 };
- s = protocol;
- e = s + 1;
- if (!protocols[0])
- request_module("paride_protocol");
- if (autoprobe) {
- s = 0;
- e = MAX_PROTOS;
- } else if ((s < 0) || (s >= MAX_PROTOS) || (port <= 0) ||
- (!protocols[s]) || (unit < 0) ||
- (unit >= protocols[s]->max_units)) {
- printk("%s: Invalid parametersn", device);
- return 0;
- }
- for (p = s; p < e; p++) {
- struct pi_protocol *proto = protocols[p];
- if (!proto)
- continue;
- /* still racy */
- if (!try_module_get(proto->owner))
- continue;
- pi->proto = proto;
- pi->private = 0;
- if (proto->init_proto && proto->init_proto(pi) < 0) {
- pi->proto = NULL;
- module_put(proto->owner);
- continue;
- }
- if (delay == -1)
- pi->delay = pi->proto->default_delay;
- else
- pi->delay = delay;
- pi->devtype = devtype;
- pi->device = device;
- pi->parname = NULL;
- pi->pardev = NULL;
- init_waitqueue_head(&pi->parq);
- pi->claimed = 0;
- pi->claim_cont = NULL;
- pi->mode = mode;
- if (port != -1) {
- pi->port = port;
- if (pi_probe_unit(pi, unit, scratch, verbose))
- break;
- pi->port = 0;
- } else {
- k = 0;
- while ((pi->port = lpts[k++]))
- if (pi_probe_unit
- (pi, unit, scratch, verbose))
- break;
- if (pi->port)
- break;
- }
- if (pi->proto->release_proto)
- pi->proto->release_proto(pi);
- module_put(proto->owner);
- }
- if (!pi->port) {
- if (autoprobe)
- printk("%s: Autoprobe failedn", device);
- else
- printk("%s: Adapter not foundn", device);
- return 0;
- }
- #ifndef CONFIG_PARPORT
- if (!request_region(pi->port, pi->reserved, pi->device)) {
- printk(KERN_WARNING "paride: Unable to request region 0x%xn",
- pi->port);
- return 0;
- }
- #endif /* !CONFIG_PARPORT */
- if (pi->parname)
- printk("%s: Sharing %s at 0x%xn", pi->device,
- pi->parname, pi->port);
- pi->proto->log_adapter(pi, scratch, verbose);
- return 1;
- }
- EXPORT_SYMBOL(pi_init);