source: mainline/uspace/lib/libdrv/include/driver.h@ 08d9525a

/*
 * Copyright (c) 2010 Lenka Trochtova
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup libdrv
 * @{
 */
/** @file
 */
#ifndef LIBDRV_DRIVER_H_
#define LIBDRV_DRIVER_H_


#include <adt/list.h>
#include <ipc/ipc.h>
#include <ipc/devman.h>
#include <ipc/dev_iface.h>
#include <device/hw_res.h>
#include <device/char.h>
#include <assert.h>
#include <ddi.h>
#include <libarch/ddi.h>
#include <fibril_synch.h>
#include <malloc.h>

struct device;
typedef struct device device_t;

// device interface

// first two parameters: device and interface structure registered by the devices driver
typedef void remote_iface_func_t(device_t*, void *, ipc_callid_t, ipc_call_t *);
typedef remote_iface_func_t *remote_iface_func_ptr_t;
typedef void remote_handler_t(device_t*, ipc_callid_t, ipc_call_t *);

typedef struct {
        size_t method_count;
        remote_iface_func_ptr_t *methods;
} remote_iface_t;

typedef struct {
        remote_iface_t * ifaces[DEV_IFACE_COUNT];
} iface_dipatch_table_t;


static inline bool is_valid_iface_idx(int idx)
{
        return 0 <= idx && idx < DEV_IFACE_MAX;
}

remote_iface_t* get_remote_iface(int idx);
remote_iface_func_ptr_t get_remote_method(remote_iface_t *rem_iface, ipcarg_t iface_method_idx);


// device class

/** Devices belonging to the same class should implement the same set of interfaces.*/
typedef struct device_class {
        /** Unique identification of the class. */
        int id;
        /** Optional callback function called when a client is connecting to the device. */
        int (*open)(device_t *dev);
        /** Optional callback function called when a client is disconnecting from the device. */
        void (*close)(device_t *dev);
        /** The table of standard interfaces implemented by the device. */
        void *interfaces[DEV_IFACE_COUNT];      
        /** The default handler of remote client requests. If the client's remote request cannot be handled 
         * by any of the standard interfaces, the default handler is used.*/
        remote_handler_t *default_handler;
} device_class_t;


// device

/** The device. */
struct device {
        /** Globally unique device identifier (assigned to the device by the device manager). */
        device_handle_t handle;
        /** The phone to the parent device driver (if it is different from this driver).*/
        int parent_phone;
        /** Parent device if handled by this driver, NULL otherwise. */
        device_t *parent;
        /** The device's name.*/
        const char *name;
        /** The list of device ids for device-to-driver matching.*/
        match_id_list_t match_ids;
        /** The device driver's data associated with this device.*/
        void *driver_data;
        /** Device class consist of class id and table of interfaces supported by the device.*/
        device_class_t *class;
        /** Pointer to the previous and next device in the list of devices handled by the driver */
        link_t link;
};


// driver

/** Generic device driver operations. */
typedef struct driver_ops {
        /** Callback method for passing a new device to the device driver.*/
        int (*add_device)(device_t *dev);
        // TODO add other generic driver operations
} driver_ops_t;

/** The driver structure.*/
typedef struct driver {
        /** The name of the device driver. */
        const char *name;
        /** Generic device driver operations. */
        driver_ops_t *driver_ops;
} driver_t;

int driver_main(driver_t *drv);

/** Create new device structure. 
 * 
 * @return the device structure.
 */
static inline device_t * create_device()
{
        device_t *dev = malloc(sizeof(device_t));
        if (NULL != dev) {
                memset(dev, 0, sizeof(device_t));
                init_match_ids(&dev->match_ids);
        }       
        return dev;
}

/** Delete device structure. 
 * 
 * @param dev the device structure.
 */
static inline void delete_device(device_t *dev)
{
        clean_match_ids(&dev->match_ids);
        if (NULL != dev->name) {
                free(dev->name);
        }
        free(dev);
}

static inline void * device_get_iface(device_t *dev, dev_inferface_idx_t idx)
{
        assert(is_valid_iface_idx(idx));        
        if (NULL == dev->class) {
                return NULL;
        }
        return dev->class->interfaces[idx];     
}

int child_device_register(device_t *child, device_t *parent);

// interrupts

typedef void interrupt_handler_t(device_t *dev, ipc_callid_t iid, ipc_call_t *icall);

typedef struct interrupt_context {
        int id;
        device_t *dev;
        int irq;
        interrupt_handler_t *handler;
        link_t link;
} interrupt_context_t;

typedef struct interrupt_context_list {
        int curr_id;
        link_t contexts;
        fibril_mutex_t mutex;
} interrupt_context_list_t;

static inline interrupt_context_t * create_interrupt_context()
{ 
        interrupt_context_t *ctx = (interrupt_context_t *)malloc(sizeof(interrupt_context_t));
        if (NULL != ctx) {
                memset(ctx, 0, sizeof(interrupt_context_t));
        }
        return ctx;
}

static inline void delete_interrupt_context(interrupt_context_t *ctx)
{
        if (NULL != ctx) {
                free(ctx);
        }
}

static inline void init_interrupt_context_list(interrupt_context_list_t *list)
{
        memset(list, 0, sizeof(interrupt_context_list_t));
        fibril_mutex_initialize(&list->mutex);
        list_initialize(&list->contexts);       
}

static inline void add_interrupt_context(interrupt_context_list_t *list, interrupt_context_t *ctx)
{
        fibril_mutex_lock(&list->mutex);
        
        ctx->id = list->curr_id++;
        list_append(&ctx->link, &list->contexts);
        
        fibril_mutex_unlock(&list->mutex);
}

static inline void remove_interrupt_context(interrupt_context_list_t *list, interrupt_context_t *ctx)
{
        fibril_mutex_lock(&list->mutex);
        
        list_remove(&ctx->link);
        
        fibril_mutex_unlock(&list->mutex);
}

static inline interrupt_context_t *find_interrupt_context_by_id(interrupt_context_list_t *list, int id) 
{
        fibril_mutex_lock(&list->mutex);        
        link_t *link = list->contexts.next;
        interrupt_context_t *ctx;
        
        while (link != &list->contexts) {
                ctx = list_get_instance(link, interrupt_context_t, link);
                if (id == ctx->id) {
                        fibril_mutex_unlock(&list->mutex);
                        return ctx;
                }
                link = link->next;
        }       
        fibril_mutex_unlock(&list->mutex);      
        return NULL;
}

static inline interrupt_context_t *find_interrupt_context(interrupt_context_list_t *list, device_t *dev, int irq) 
{
        fibril_mutex_lock(&list->mutex);        
        link_t *link = list->contexts.next;
        interrupt_context_t *ctx;
        
        while (link != &list->contexts) {
                ctx = list_get_instance(link, interrupt_context_t, link);
                if (irq == ctx->irq && dev == ctx->dev) {
                        fibril_mutex_unlock(&list->mutex);
                        return ctx;
                }
                link = link->next;
        }       
        fibril_mutex_unlock(&list->mutex);      
        return NULL;
}

int register_interrupt_handler(device_t *dev, int irq, interrupt_handler_t *handler, irq_code_t *pseudocode);
int unregister_interrupt_handler(device_t *dev, int irq);


// default handler for client requests

static inline remote_handler_t * device_get_default_handler(device_t *dev)
{
        if (NULL == dev->class) {
                return NULL;
        }
        
        return dev->class->default_handler;     
}

#endif

/**
 * @}
 */