diff options
Diffstat (limited to 'net/irda/irda_device.c')
| -rw-r--r-- | net/irda/irda_device.c | 489 |
1 files changed, 489 insertions, 0 deletions
diff --git a/net/irda/irda_device.c b/net/irda/irda_device.c new file mode 100644 index 00000000000..fda299e300c --- /dev/null +++ b/net/irda/irda_device.c @@ -0,0 +1,489 @@ +/********************************************************************* + * + * Filename: irda_device.c + * Version: 0.9 + * Description: Utility functions used by the device drivers + * Status: Experimental. + * Author: Dag Brattli <dagb@cs.uit.no> + * Created at: Sat Oct 9 09:22:27 1999 + * Modified at: Sun Jan 23 17:41:24 2000 + * Modified by: Dag Brattli <dagb@cs.uit.no> + * + * Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved. + * Copyright (c) 2000-2001 Jean Tourrilhes <jt@hpl.hp.com> + * + * 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 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., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + * + ********************************************************************/ + +#include <linux/config.h> +#include <linux/string.h> +#include <linux/proc_fs.h> +#include <linux/skbuff.h> +#include <linux/if.h> +#include <linux/if_ether.h> +#include <linux/if_arp.h> +#include <linux/netdevice.h> +#include <linux/init.h> +#include <linux/tty.h> +#include <linux/kmod.h> +#include <linux/spinlock.h> + +#include <asm/ioctls.h> +#include <asm/uaccess.h> +#include <asm/dma.h> +#include <asm/io.h> + +#include <net/irda/irda_device.h> +#include <net/irda/irlap.h> +#include <net/irda/timer.h> +#include <net/irda/wrapper.h> + +static void __irda_task_delete(struct irda_task *task); + +static hashbin_t *dongles = NULL; +static hashbin_t *tasks = NULL; + +#ifdef CONFIG_IRDA_DEBUG +static const char *task_state[] = { + "IRDA_TASK_INIT", + "IRDA_TASK_DONE", + "IRDA_TASK_WAIT", + "IRDA_TASK_WAIT1", + "IRDA_TASK_WAIT2", + "IRDA_TASK_WAIT3", + "IRDA_TASK_CHILD_INIT", + "IRDA_TASK_CHILD_WAIT", + "IRDA_TASK_CHILD_DONE", +}; +#endif /* CONFIG_IRDA_DEBUG */ + +static void irda_task_timer_expired(void *data); + +int __init irda_device_init( void) +{ + dongles = hashbin_new(HB_NOLOCK); + if (dongles == NULL) { + IRDA_WARNING("IrDA: Can't allocate dongles hashbin!\n"); + return -ENOMEM; + } + spin_lock_init(&dongles->hb_spinlock); + + tasks = hashbin_new(HB_LOCK); + if (tasks == NULL) { + IRDA_WARNING("IrDA: Can't allocate tasks hashbin!\n"); + hashbin_delete(dongles, NULL); + return -ENOMEM; + } + + /* We no longer initialise the driver ourselves here, we let + * the system do it for us... - Jean II */ + + return 0; +} + +static void __exit leftover_dongle(void *arg) +{ + struct dongle_reg *reg = arg; + IRDA_WARNING("IrDA: Dongle type %x not unregistered\n", + reg->type); +} + +void __exit irda_device_cleanup(void) +{ + IRDA_DEBUG(4, "%s()\n", __FUNCTION__); + + hashbin_delete(tasks, (FREE_FUNC) __irda_task_delete); + + hashbin_delete(dongles, leftover_dongle); +} + +/* + * Function irda_device_set_media_busy (self, status) + * + * Called when we have detected that another station is transmitting + * in contention mode. + */ +void irda_device_set_media_busy(struct net_device *dev, int status) +{ + struct irlap_cb *self; + + IRDA_DEBUG(4, "%s(%s)\n", __FUNCTION__, status ? "TRUE" : "FALSE"); + + self = (struct irlap_cb *) dev->atalk_ptr; + + IRDA_ASSERT(self != NULL, return;); + IRDA_ASSERT(self->magic == LAP_MAGIC, return;); + + if (status) { + self->media_busy = TRUE; + if (status == SMALL) + irlap_start_mbusy_timer(self, SMALLBUSY_TIMEOUT); + else + irlap_start_mbusy_timer(self, MEDIABUSY_TIMEOUT); + IRDA_DEBUG( 4, "Media busy!\n"); + } else { + self->media_busy = FALSE; + irlap_stop_mbusy_timer(self); + } +} +EXPORT_SYMBOL(irda_device_set_media_busy); + + +/* + * Function irda_device_is_receiving (dev) + * + * Check if the device driver is currently receiving data + * + */ +int irda_device_is_receiving(struct net_device *dev) +{ + struct if_irda_req req; + int ret; + + IRDA_DEBUG(2, "%s()\n", __FUNCTION__); + + if (!dev->do_ioctl) { + IRDA_ERROR("%s: do_ioctl not impl. by device driver\n", + __FUNCTION__); + return -1; + } + + ret = dev->do_ioctl(dev, (struct ifreq *) &req, SIOCGRECEIVING); + if (ret < 0) + return ret; + + return req.ifr_receiving; +} + +void irda_task_next_state(struct irda_task *task, IRDA_TASK_STATE state) +{ + IRDA_DEBUG(2, "%s(), state = %s\n", __FUNCTION__, task_state[state]); + + task->state = state; +} +EXPORT_SYMBOL(irda_task_next_state); + +static void __irda_task_delete(struct irda_task *task) +{ + del_timer(&task->timer); + + kfree(task); +} + +void irda_task_delete(struct irda_task *task) +{ + /* Unregister task */ + hashbin_remove(tasks, (long) task, NULL); + + __irda_task_delete(task); +} +EXPORT_SYMBOL(irda_task_delete); + +/* + * Function irda_task_kick (task) + * + * Tries to execute a task possible multiple times until the task is either + * finished, or askes for a timeout. When a task is finished, we do post + * processing, and notify the parent task, that is waiting for this task + * to complete. + */ +static int irda_task_kick(struct irda_task *task) +{ + int finished = TRUE; + int count = 0; + int timeout; + + IRDA_DEBUG(2, "%s()\n", __FUNCTION__); + + IRDA_ASSERT(task != NULL, return -1;); + IRDA_ASSERT(task->magic == IRDA_TASK_MAGIC, return -1;); + + /* Execute task until it's finished, or askes for a timeout */ + do { + timeout = task->function(task); + if (count++ > 100) { + IRDA_ERROR("%s: error in task handler!\n", + __FUNCTION__); + irda_task_delete(task); + return TRUE; + } + } while ((timeout == 0) && (task->state != IRDA_TASK_DONE)); + + if (timeout < 0) { + IRDA_ERROR("%s: Error executing task!\n", __FUNCTION__); + irda_task_delete(task); + return TRUE; + } + + /* Check if we are finished */ + if (task->state == IRDA_TASK_DONE) { + del_timer(&task->timer); + + /* Do post processing */ + if (task->finished) + task->finished(task); + + /* Notify parent */ + if (task->parent) { + /* Check if parent is waiting for us to complete */ + if (task->parent->state == IRDA_TASK_CHILD_WAIT) { + task->parent->state = IRDA_TASK_CHILD_DONE; + + /* Stop timer now that we are here */ + del_timer(&task->parent->timer); + + /* Kick parent task */ + irda_task_kick(task->parent); + } + } + irda_task_delete(task); + } else if (timeout > 0) { + irda_start_timer(&task->timer, timeout, (void *) task, + irda_task_timer_expired); + finished = FALSE; + } else { + IRDA_DEBUG(0, "%s(), not finished, and no timeout!\n", + __FUNCTION__); + finished = FALSE; + } + + return finished; +} + +/* + * Function irda_task_execute (instance, function, finished) + * + * This function registers and tries to execute tasks that may take some + * time to complete. We do it this hairy way since we may have been + * called from interrupt context, so it's not possible to use + * schedule_timeout() + * Two important notes : + * o Make sure you irda_task_delete(task); in case you delete the + * calling instance. + * o No real need to lock when calling this function, but you may + * want to lock within the task handler. + * Jean II + */ +struct irda_task *irda_task_execute(void *instance, + IRDA_TASK_CALLBACK function, + IRDA_TASK_CALLBACK finished, + struct irda_task *parent, void *param) +{ + struct irda_task *task; + + IRDA_DEBUG(2, "%s()\n", __FUNCTION__); + + task = kmalloc(sizeof(struct irda_task), GFP_ATOMIC); + if (!task) + return NULL; + + task->state = IRDA_TASK_INIT; + task->instance = instance; + task->function = function; + task->finished = finished; + task->parent = parent; + task->param = param; + task->magic = IRDA_TASK_MAGIC; + + init_timer(&task->timer); + + /* Register task */ + hashbin_insert(tasks, (irda_queue_t *) task, (long) task, NULL); + + /* No time to waste, so lets get going! */ + return irda_task_kick(task) ? NULL : task; +} +EXPORT_SYMBOL(irda_task_execute); + +/* + * Function irda_task_timer_expired (data) + * + * Task time has expired. We now try to execute task (again), and restart + * the timer if the task has not finished yet + */ +static void irda_task_timer_expired(void *data) +{ + struct irda_task *task; + + IRDA_DEBUG(2, "%s()\n", __FUNCTION__); + + task = (struct irda_task *) data; + + irda_task_kick(task); +} + +/* + * Function irda_device_setup (dev) + * + * This function should be used by low level device drivers in a similar way + * as ether_setup() is used by normal network device drivers + */ +static void irda_device_setup(struct net_device *dev) +{ + dev->hard_header_len = 0; + dev->addr_len = 0; + + dev->type = ARPHRD_IRDA; + dev->tx_queue_len = 8; /* Window size + 1 s-frame */ + + memset(dev->broadcast, 0xff, 4); + + dev->mtu = 2048; + dev->flags = IFF_NOARP; +} + +/* + * Funciton alloc_irdadev + * Allocates and sets up an IRDA device in a manner similar to + * alloc_etherdev. + */ +struct net_device *alloc_irdadev(int sizeof_priv) +{ + return alloc_netdev(sizeof_priv, "irda%d", irda_device_setup); +} +EXPORT_SYMBOL(alloc_irdadev); + +/* + * Function irda_device_init_dongle (self, type, qos) + * + * Initialize attached dongle. + * + * Important : request_module require us to call this function with + * a process context and irq enabled. - Jean II + */ +dongle_t *irda_device_dongle_init(struct net_device *dev, int type) +{ + struct dongle_reg *reg; + dongle_t *dongle = NULL; + + might_sleep(); + + spin_lock(&dongles->hb_spinlock); + reg = hashbin_find(dongles, type, NULL); + +#ifdef CONFIG_KMOD + /* Try to load the module needed */ + if (!reg && capable(CAP_SYS_MODULE)) { + spin_unlock(&dongles->hb_spinlock); + + request_module("irda-dongle-%d", type); + + spin_lock(&dongles->hb_spinlock); + reg = hashbin_find(dongles, type, NULL); + } +#endif + + if (!reg || !try_module_get(reg->owner) ) { + IRDA_ERROR("IrDA: Unable to find requested dongle type %x\n", + type); + goto out; + } + + /* Allocate dongle info for this instance */ + dongle = kmalloc(sizeof(dongle_t), GFP_KERNEL); + if (!dongle) + goto out; + + memset(dongle, 0, sizeof(dongle_t)); + + /* Bind the registration info to this particular instance */ + dongle->issue = reg; + dongle->dev = dev; + + out: + spin_unlock(&dongles->hb_spinlock); + return dongle; +} +EXPORT_SYMBOL(irda_device_dongle_init); + +/* + * Function irda_device_dongle_cleanup (dongle) + */ +int irda_device_dongle_cleanup(dongle_t *dongle) +{ + IRDA_ASSERT(dongle != NULL, return -1;); + + dongle->issue->close(dongle); + module_put(dongle->issue->owner); + kfree(dongle); + + return 0; +} +EXPORT_SYMBOL(irda_device_dongle_cleanup); + +/* + * Function irda_device_register_dongle (dongle) + */ +int irda_device_register_dongle(struct dongle_reg *new) +{ + spin_lock(&dongles->hb_spinlock); + /* Check if this dongle has been registered before */ + if (hashbin_find(dongles, new->type, NULL)) { + IRDA_MESSAGE("%s: Dongle type %x already registered\n", + __FUNCTION__, new->type); + } else { + /* Insert IrDA dongle into hashbin */ + hashbin_insert(dongles, (irda_queue_t *) new, new->type, NULL); + } + spin_unlock(&dongles->hb_spinlock); + + return 0; +} +EXPORT_SYMBOL(irda_device_register_dongle); + +/* + * Function irda_device_unregister_dongle (dongle) + * + * Unregister dongle, and remove dongle from list of registered dongles + * + */ +void irda_device_unregister_dongle(struct dongle_reg *dongle) +{ + struct dongle *node; + + spin_lock(&dongles->hb_spinlock); + node = hashbin_remove(dongles, dongle->type, NULL); + if (!node) + IRDA_ERROR("%s: dongle not found!\n", __FUNCTION__); + spin_unlock(&dongles->hb_spinlock); +} +EXPORT_SYMBOL(irda_device_unregister_dongle); + +#ifdef CONFIG_ISA +/* + * Function setup_dma (idev, buffer, count, mode) + * + * Setup the DMA channel. Commonly used by ISA FIR drivers + * + */ +void irda_setup_dma(int channel, dma_addr_t buffer, int count, int mode) +{ + unsigned long flags; + + flags = claim_dma_lock(); + + disable_dma(channel); + clear_dma_ff(channel); + set_dma_mode(channel, mode); + set_dma_addr(channel, buffer); + set_dma_count(channel, count); + enable_dma(channel); + + release_dma_lock(flags); +} +EXPORT_SYMBOL(irda_setup_dma); +#endif |