--- /dev/null
+/*
+ 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/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>
+#include <linux/sched.h> /* TASK_* */
+#include <linux/parport.h>
+
+#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);
+
+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();
+}
+
+int pi_schedule_claimed(PIA * pi, void (*cont) (void))
+{
+ 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);
+ 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;
+ if (pi->pardev)
+ wait_event(pi->parq,
+ !parport_claim((struct pardevice *) pi->pardev));
+}
+
+static void pi_unclaim(PIA * pi)
+{
+ pi->claimed = 0;
+ if (pi->pardev)
+ parport_release((struct pardevice *) (pi->pardev));
+}
+
+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)
+{
+ if (pi->pardev) {
+ parport_unregister_device((struct pardevice *) (pi->pardev));
+ pi->pardev = NULL;
+ }
+}
+
+void pi_release(PIA * pi)
+{
+ pi_unregister_parport(pi);
+ 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 paride_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 registered\n",
+ pr->name);
+ return -1;
+ }
+ k = 0;
+ while ((k < MAX_PROTOS) && (protocols[k]))
+ k++;
+ if (k == MAX_PROTOS) {
+ printk("paride: protocol table full\n");
+ return -1;
+ }
+ protocols[k] = pr;
+ pr->index = k;
+ printk("paride: %s registered as protocol %d\n", pr->name, k);
+ return 0;
+}
+
+EXPORT_SYMBOL(paride_register);
+
+void paride_unregister(PIP * pr)
+{
+ if (!pr)
+ return;
+ if (protocols[pr->index] != pr) {
+ printk("paride: %s not registered\n", pr->name);
+ return;
+ }
+ protocols[pr->index] = NULL;
+}
+
+EXPORT_SYMBOL(paride_unregister);
+
+static int pi_register_parport(PIA * pi, int verbose)
+{
+ 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 %s\n", pi->device, pi->port, port->name);
+
+ pi->parname = (char *) port->name;
+
+ 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 parameters\n", 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 failed\n", device);
+ else
+ printk("%s: Adapter not found\n", device);
+ return 0;
+ }
+
+ if (pi->parname)
+ printk("%s: Sharing %s at 0x%x\n", pi->device,
+ pi->parname, pi->port);
+
+ pi->proto->log_adapter(pi, scratch, verbose);
+
+ return 1;
+}
+
+EXPORT_SYMBOL(pi_init);
Code Review / kvmfornfv.git / blobdiff