diff options
Diffstat (limited to 'drivers/staging/meilhaus/medlock.c')
| -rw-r--r-- | drivers/staging/meilhaus/medlock.c | 195 |
1 files changed, 0 insertions, 195 deletions
diff --git a/drivers/staging/meilhaus/medlock.c b/drivers/staging/meilhaus/medlock.c deleted file mode 100644 index 8ded397214f8..000000000000 --- a/drivers/staging/meilhaus/medlock.c +++ /dev/null @@ -1,195 +0,0 @@ -/** - * @file medlock.c - * - * @brief Implements the device lock class. - * @note Copyright (C) 2006 Meilhaus Electronic GmbH (support@meilhaus.de) - * @author Guenter Gebhardt - */ - -/* - * Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de) - * - * This file 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 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the 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 <linux/spinlock.h> - -#include "medefines.h" -#include "meerror.h" - -#include "medebug.h" -#include "meslist.h" -#include "mesubdevice.h" -#include "medlock.h" - -int me_dlock_enter(struct me_dlock *dlock, struct file *filep) -{ - PDEBUG_LOCKS("executed.\n"); - - spin_lock(&dlock->spin_lock); - - if ((dlock->filep) != NULL && (dlock->filep != filep)) { - PERROR("Device is locked by another process.\n"); - spin_unlock(&dlock->spin_lock); - return ME_ERRNO_LOCKED; - } - - dlock->count++; - - spin_unlock(&dlock->spin_lock); - - return ME_ERRNO_SUCCESS; -} - -int me_dlock_exit(struct me_dlock *dlock, struct file *filep) -{ - PDEBUG_LOCKS("executed.\n"); - - spin_lock(&dlock->spin_lock); - dlock->count--; - spin_unlock(&dlock->spin_lock); - - return ME_ERRNO_SUCCESS; -} - -int me_dlock_lock(struct me_dlock *dlock, - struct file *filep, int lock, int flags, me_slist_t *slist) -{ - int err = ME_ERRNO_SUCCESS; - int i; - me_subdevice_t *subdevice; - - PDEBUG_LOCKS("executed.\n"); - - spin_lock(&dlock->spin_lock); - - switch (lock) { - - case ME_LOCK_RELEASE: - if ((dlock->filep == filep) || (dlock->filep == NULL)) { - dlock->filep = NULL; - - /* Unlock all possibly locked subdevices. */ - - for (i = 0; i < me_slist_get_number_subdevices(slist); - i++) { - subdevice = me_slist_get_subdevice(slist, i); - - if (subdevice) - err = - subdevice-> - me_subdevice_lock_subdevice - (subdevice, filep, ME_LOCK_RELEASE, - flags); - else - err = ME_ERRNO_INTERNAL; - } - } - - break; - - case ME_LOCK_SET: - if (dlock->count) { - PERROR("Device is used by another process.\n"); - err = ME_ERRNO_USED; - } else if ((dlock->filep != NULL) && (dlock->filep != filep)) { - PERROR("Device is locked by another process.\n"); - err = ME_ERRNO_LOCKED; - } else if (dlock->filep == NULL) { - /* Check any subdevice is locked by another process. */ - - for (i = 0; i < me_slist_get_number_subdevices(slist); - i++) { - subdevice = me_slist_get_subdevice(slist, i); - - if (subdevice) { - if ((err = - subdevice-> - me_subdevice_lock_subdevice - (subdevice, filep, ME_LOCK_CHECK, - flags))) { - PERROR - ("A subdevice is locked by another process.\n"); - break; - } - } else { - err = ME_ERRNO_INTERNAL; - } - } - - /* If no subdevices are locked by other processes, - we can take ownership of the device. Otherwise we jump ahead. */ - if (!err) - dlock->filep = filep; - } - - break; - - case ME_LOCK_CHECK: - if (dlock->count) { - err = ME_ERRNO_USED; - } else if ((dlock->filep != NULL) && (dlock->filep != filep)) { - err = ME_ERRNO_LOCKED; - } else if (dlock->filep == NULL) { - for (i = 0; i < me_slist_get_number_subdevices(slist); - i++) { - subdevice = me_slist_get_subdevice(slist, i); - - if (subdevice) { - if ((err = - subdevice-> - me_subdevice_lock_subdevice - (subdevice, filep, ME_LOCK_CHECK, - flags))) { - PERROR - ("A subdevice is locked by another process.\n"); - break; - } - } else { - err = ME_ERRNO_INTERNAL; - } - } - } - - break; - - default: - PERROR("Invalid lock.\n"); - - err = ME_ERRNO_INVALID_LOCK; - - break; - } - - spin_unlock(&dlock->spin_lock); - - return err; -} - -void me_dlock_deinit(struct me_dlock *dlock) -{ - PDEBUG_LOCKS("executed.\n"); -} - -int me_dlock_init(me_dlock_t *dlock) -{ - PDEBUG_LOCKS("executed.\n"); - - dlock->filep = NULL; - dlock->count = 0; - spin_lock_init(&dlock->spin_lock); - - return 0; -} |