diff options
Diffstat (limited to 'drivers/isdn/hardware/eicon/dadapter.c')
| -rw-r--r-- | drivers/isdn/hardware/eicon/dadapter.c | 364 |
1 files changed, 364 insertions, 0 deletions
diff --git a/drivers/isdn/hardware/eicon/dadapter.c b/drivers/isdn/hardware/eicon/dadapter.c new file mode 100644 index 000000000..514209994 --- /dev/null +++ b/drivers/isdn/hardware/eicon/dadapter.c @@ -0,0 +1,364 @@ +/* + * + Copyright (c) Eicon Networks, 2002. + * + This source file is supplied for the use with + Eicon Networks range of DIVA Server Adapters. + * + Eicon File Revision : 2.1 + * + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + * + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY OF ANY KIND WHATSOEVER INCLUDING ANY + implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + See the GNU General Public License for more details. + * + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ +#include "platform.h" +#include "pc.h" +#include "debuglib.h" +#include "di_defs.h" +#include "divasync.h" +#include "dadapter.h" +/* -------------------------------------------------------------------------- + Adapter array change notification framework + -------------------------------------------------------------------------- */ +typedef struct _didd_adapter_change_notification { + didd_adapter_change_callback_t callback; + void IDI_CALL_ENTITY_T *context; +} didd_adapter_change_notification_t, \ + * IDI_CALL_ENTITY_T pdidd_adapter_change_notification_t; +#define DIVA_DIDD_MAX_NOTIFICATIONS 256 +static didd_adapter_change_notification_t \ +NotificationTable[DIVA_DIDD_MAX_NOTIFICATIONS]; +/* -------------------------------------------------------------------------- + Array to held adapter information + -------------------------------------------------------------------------- */ +static DESCRIPTOR HandleTable[NEW_MAX_DESCRIPTORS]; +static dword Adapters = 0; /* Number of adapters */ +/* -------------------------------------------------------------------------- + Shadow IDI_DIMAINT + and 'shadow' debug stuff + -------------------------------------------------------------------------- */ +static void no_printf(unsigned char *format, ...) +{ +#ifdef EBUG + va_list ap; + va_start(ap, format); + debug((format, ap)); + va_end(ap); +#endif +} + +/* ------------------------------------------------------------------------- + Portable debug Library + ------------------------------------------------------------------------- */ +#include "debuglib.c" + +static DESCRIPTOR MAdapter = {IDI_DIMAINT, /* Adapter Type */ + 0x00, /* Channels */ + 0x0000, /* Features */ + (IDI_CALL)no_printf}; +/* -------------------------------------------------------------------------- + DAdapter. Only IDI clients with buffer, that is huge enough to + get all descriptors will receive information about DAdapter + { byte type, byte channels, word features, IDI_CALL request } + -------------------------------------------------------------------------- */ +static void IDI_CALL_LINK_T diva_dadapter_request(ENTITY IDI_CALL_ENTITY_T *); +static DESCRIPTOR DAdapter = {IDI_DADAPTER, /* Adapter Type */ + 0x00, /* Channels */ + 0x0000, /* Features */ + diva_dadapter_request }; +/* -------------------------------------------------------------------------- + LOCALS + -------------------------------------------------------------------------- */ +static dword diva_register_adapter_callback(\ + didd_adapter_change_callback_t callback, + void IDI_CALL_ENTITY_T *context); +static void diva_remove_adapter_callback(dword handle); +static void diva_notify_adapter_change(DESCRIPTOR *d, int removal); +static diva_os_spin_lock_t didd_spin; +/* -------------------------------------------------------------------------- + Should be called as first step, after driver init + -------------------------------------------------------------------------- */ +void diva_didd_load_time_init(void) { + memset(&HandleTable[0], 0x00, sizeof(HandleTable)); + memset(&NotificationTable[0], 0x00, sizeof(NotificationTable)); + diva_os_initialize_spin_lock(&didd_spin, "didd"); +} +/* -------------------------------------------------------------------------- + Should be called as last step, if driver does unload + -------------------------------------------------------------------------- */ +void diva_didd_load_time_finit(void) { + diva_os_destroy_spin_lock(&didd_spin, "didd"); +} +/* -------------------------------------------------------------------------- + Called in order to register new adapter in adapter array + return adapter handle (> 0) on success + return -1 adapter array overflow + -------------------------------------------------------------------------- */ +static int diva_didd_add_descriptor(DESCRIPTOR *d) { + diva_os_spin_lock_magic_t irql; + int i; + if (d->type == IDI_DIMAINT) { + if (d->request) { + MAdapter.request = d->request; + dprintf = (DIVA_DI_PRINTF)d->request; + diva_notify_adapter_change(&MAdapter, 0); /* Inserted */ + DBG_TRC(("DIMAINT registered, dprintf=%08x", d->request)) + } else { + DBG_TRC(("DIMAINT removed")) + diva_notify_adapter_change(&MAdapter, 1); /* About to remove */ + MAdapter.request = (IDI_CALL)no_printf; + dprintf = no_printf; + } + return (NEW_MAX_DESCRIPTORS); + } + for (i = 0; i < NEW_MAX_DESCRIPTORS; i++) { + diva_os_enter_spin_lock(&didd_spin, &irql, "didd_add"); + if (HandleTable[i].type == 0) { + memcpy(&HandleTable[i], d, sizeof(*d)); + Adapters++; + diva_os_leave_spin_lock(&didd_spin, &irql, "didd_add"); + diva_notify_adapter_change(d, 0); /* we have new adapter */ + DBG_TRC(("Add adapter[%d], request=%08x", (i + 1), d->request)) + return (i + 1); + } + diva_os_leave_spin_lock(&didd_spin, &irql, "didd_add"); + } + DBG_ERR(("Can't add adapter, out of resources")) + return (-1); +} +/* -------------------------------------------------------------------------- + Called in order to remove one registered adapter from array + return adapter handle (> 0) on success + return 0 on success + -------------------------------------------------------------------------- */ +static int diva_didd_remove_descriptor(IDI_CALL request) { + diva_os_spin_lock_magic_t irql; + int i; + if (request == MAdapter.request) { + DBG_TRC(("DIMAINT removed")) + dprintf = no_printf; + diva_notify_adapter_change(&MAdapter, 1); /* About to remove */ + MAdapter.request = (IDI_CALL)no_printf; + return (0); + } + for (i = 0; (Adapters && (i < NEW_MAX_DESCRIPTORS)); i++) { + if (HandleTable[i].request == request) { + diva_notify_adapter_change(&HandleTable[i], 1); /* About to remove */ + diva_os_enter_spin_lock(&didd_spin, &irql, "didd_rm"); + memset(&HandleTable[i], 0x00, sizeof(HandleTable[0])); + Adapters--; + diva_os_leave_spin_lock(&didd_spin, &irql, "didd_rm"); + DBG_TRC(("Remove adapter[%d], request=%08x", (i + 1), request)) + return (0); + } + } + DBG_ERR(("Invalid request=%08x, can't remove adapter", request)) + return (-1); +} +/* -------------------------------------------------------------------------- + Read adapter array + return 1 if not enough space to save all available adapters + -------------------------------------------------------------------------- */ +static int diva_didd_read_adapter_array(DESCRIPTOR *buffer, int length) { + diva_os_spin_lock_magic_t irql; + int src, dst; + memset(buffer, 0x00, length); + length /= sizeof(DESCRIPTOR); + DBG_TRC(("DIDD_Read, space = %d, Adapters = %d", length, Adapters + 2)) + + diva_os_enter_spin_lock(&didd_spin, &irql, "didd_read"); + for (src = 0, dst = 0; + (Adapters && (src < NEW_MAX_DESCRIPTORS) && (dst < length)); + src++) { + if (HandleTable[src].type) { + memcpy(&buffer[dst], &HandleTable[src], sizeof(DESCRIPTOR)); + dst++; + } + } + diva_os_leave_spin_lock(&didd_spin, &irql, "didd_read"); + if (dst < length) { + memcpy(&buffer[dst], &MAdapter, sizeof(DESCRIPTOR)); + dst++; + } else { + DBG_ERR(("Can't write DIMAINT. Array too small")) + } + if (dst < length) { + memcpy(&buffer[dst], &DAdapter, sizeof(DESCRIPTOR)); + dst++; + } else { + DBG_ERR(("Can't write DADAPTER. Array too small")) + } + DBG_TRC(("Read %d adapters", dst)) + return (dst == length); +} +/* -------------------------------------------------------------------------- + DAdapter request function. + This function does process only synchronous requests, and is used + for reception/registration of new interfaces + -------------------------------------------------------------------------- */ +static void IDI_CALL_LINK_T diva_dadapter_request( \ + ENTITY IDI_CALL_ENTITY_T *e) { + IDI_SYNC_REQ *syncReq = (IDI_SYNC_REQ *)e; + if (e->Req) { /* We do not process it, also return error */ + e->Rc = OUT_OF_RESOURCES; + DBG_ERR(("Can't process async request, Req=%02x", e->Req)) + return; + } + /* + So, we process sync request + */ + switch (e->Rc) { + case IDI_SYNC_REQ_DIDD_REGISTER_ADAPTER_NOTIFY: { + diva_didd_adapter_notify_t *pinfo = &syncReq->didd_notify.info; + pinfo->handle = diva_register_adapter_callback( \ + (didd_adapter_change_callback_t)pinfo->callback, + (void IDI_CALL_ENTITY_T *)pinfo->context); + e->Rc = 0xff; + } break; + case IDI_SYNC_REQ_DIDD_REMOVE_ADAPTER_NOTIFY: { + diva_didd_adapter_notify_t *pinfo = &syncReq->didd_notify.info; + diva_remove_adapter_callback(pinfo->handle); + e->Rc = 0xff; + } break; + case IDI_SYNC_REQ_DIDD_ADD_ADAPTER: { + diva_didd_add_adapter_t *pinfo = &syncReq->didd_add_adapter.info; + if (diva_didd_add_descriptor((DESCRIPTOR *)pinfo->descriptor) < 0) { + e->Rc = OUT_OF_RESOURCES; + } else { + e->Rc = 0xff; + } + } break; + case IDI_SYNC_REQ_DIDD_REMOVE_ADAPTER: { + diva_didd_remove_adapter_t *pinfo = &syncReq->didd_remove_adapter.info; + if (diva_didd_remove_descriptor((IDI_CALL)pinfo->p_request) < 0) { + e->Rc = OUT_OF_RESOURCES; + } else { + e->Rc = 0xff; + } + } break; + case IDI_SYNC_REQ_DIDD_READ_ADAPTER_ARRAY: { + diva_didd_read_adapter_array_t *pinfo =\ + &syncReq->didd_read_adapter_array.info; + if (diva_didd_read_adapter_array((DESCRIPTOR *)pinfo->buffer, + (int)pinfo->length)) { + e->Rc = OUT_OF_RESOURCES; + } else { + e->Rc = 0xff; + } + } break; + default: + DBG_ERR(("Can't process sync request, Req=%02x", e->Rc)) + e->Rc = OUT_OF_RESOURCES; + } +} +/* -------------------------------------------------------------------------- + IDI client does register his notification function + -------------------------------------------------------------------------- */ +static dword diva_register_adapter_callback( \ + didd_adapter_change_callback_t callback, + void IDI_CALL_ENTITY_T *context) { + diva_os_spin_lock_magic_t irql; + dword i; + + for (i = 0; i < DIVA_DIDD_MAX_NOTIFICATIONS; i++) { + diva_os_enter_spin_lock(&didd_spin, &irql, "didd_nfy_add"); + if (!NotificationTable[i].callback) { + NotificationTable[i].callback = callback; + NotificationTable[i].context = context; + diva_os_leave_spin_lock(&didd_spin, &irql, "didd_nfy_add"); + DBG_TRC(("Register adapter notification[%d]=%08x", i + 1, callback)) + return (i + 1); + } + diva_os_leave_spin_lock(&didd_spin, &irql, "didd_nfy_add"); + } + DBG_ERR(("Can't register adapter notification, overflow")) + return (0); +} +/* -------------------------------------------------------------------------- + IDI client does register his notification function + -------------------------------------------------------------------------- */ +static void diva_remove_adapter_callback(dword handle) { + diva_os_spin_lock_magic_t irql; + if (handle && ((--handle) < DIVA_DIDD_MAX_NOTIFICATIONS)) { + diva_os_enter_spin_lock(&didd_spin, &irql, "didd_nfy_rm"); + NotificationTable[handle].callback = NULL; + NotificationTable[handle].context = NULL; + diva_os_leave_spin_lock(&didd_spin, &irql, "didd_nfy_rm"); + DBG_TRC(("Remove adapter notification[%d]", (int)(handle + 1))) + return; + } + DBG_ERR(("Can't remove adapter notification, handle=%d", handle)) + } +/* -------------------------------------------------------------------------- + Notify all client about adapter array change + Does suppose following behavior in the client side: + Step 1: Redister Notification + Step 2: Read Adapter Array + -------------------------------------------------------------------------- */ +static void diva_notify_adapter_change(DESCRIPTOR *d, int removal) { + int i, do_notify; + didd_adapter_change_notification_t nfy; + diva_os_spin_lock_magic_t irql; + for (i = 0; i < DIVA_DIDD_MAX_NOTIFICATIONS; i++) { + do_notify = 0; + diva_os_enter_spin_lock(&didd_spin, &irql, "didd_nfy"); + if (NotificationTable[i].callback) { + memcpy(&nfy, &NotificationTable[i], sizeof(nfy)); + do_notify = 1; + } + diva_os_leave_spin_lock(&didd_spin, &irql, "didd_nfy"); + if (do_notify) { + (*(nfy.callback))(nfy.context, d, removal); + } + } +} +/* -------------------------------------------------------------------------- + For all systems, that are linked by Kernel Mode Linker this is ONLY one + function thet should be exported by this device driver + IDI clients should look for IDI_DADAPTER, and use request function + of this adapter (sync request) in order to receive appropriate services: + - add new adapter + - remove existing adapter + - add adapter array notification + - remove adapter array notification + (read adapter is redundant in this case) + INPUT: + buffer - pointer to buffer that will receive adapter array + length - length (in bytes) of space in buffer + OUTPUT: + Adapter array will be written to memory described by 'buffer' + If the last adapter seen in the returned adapter array is + IDI_DADAPTER or if last adapter in array does have type '0', then + it was enougth space in buffer to accommodate all available + adapter descriptors + *NOTE 1 (debug interface): + The IDI adapter of type 'IDI_DIMAINT' does register as 'request' + famous 'dprintf' function (of type DI_PRINTF, please look + include/debuglib.c and include/debuglib.h) for details. + So dprintf is not exported from module debug module directly, + instead of this IDI_DIMAINT is registered. + Module load order will receive in this case: + 1. DIDD (this file) + 2. DIMAINT does load and register 'IDI_DIMAINT', at this step + DIDD should be able to get 'dprintf', save it, and + register with DIDD by means of 'dprintf' function. + 3. any other driver is loaded and is able to access adapter array + and debug interface + This approach does allow to load/unload debug interface on demand, + and save memory, it it is necessary. + -------------------------------------------------------------------------- */ +void IDI_CALL_LINK_T DIVA_DIDD_Read(void IDI_CALL_ENTITY_T *buffer, + int length) { + diva_didd_read_adapter_array(buffer, length); +} |