/*
 * Copyright 2006-2009, Haiku, Inc. All Rights Reserved.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *              Axel Dörfler, axeld@pinc-software.de
 */


#include "driver.h"
#include "device.h"
#include "radeon_hd.h"
#include "utility.h"

#include <OS.h>
#include <KernelExport.h>
#include <Drivers.h>
#include <PCI.h>
#include <SupportDefs.h>
#include <graphic_driver.h>
#include <image.h>

#include <stdlib.h>
#include <string.h>


//#define DEBUG_COMMANDS

#define TRACE_DEVICE
#ifdef TRACE_DEVICE
#       define TRACE(x...) dprintf("radeon_hd: " x)
#else
#       define TRACE(x...) ;
#endif

#define ERROR(x...) dprintf("radeon_hd: " x)


/* device hooks prototypes */

static status_t device_open(const char* name, uint32 flags, void** _cookie);
static status_t device_close(void* data);
static status_t device_free(void* data);
static status_t device_ioctl(void* data, uint32 opcode,
        void* buffer, size_t length);
static status_t device_read(void* data, off_t offset,
        void* buffer, size_t* length);
static status_t device_write(void* data, off_t offset,
        const void* buffer, size_t* length);


device_hooks gDeviceHooks = {
        device_open,
        device_close,
        device_free,
        device_ioctl,
        device_read,
        device_write,
        NULL,
        NULL,
        NULL,
        NULL
};


#ifdef DEBUG_COMMANDS
static int
getset_register(int argc, char** argv)
{
        if (argc < 2 || argc > 3) {
                kprintf("usage: %s <register> [set-to-value]\n", argv[0]);
                return 0;
        }

        uint32 reg = parse_expression(argv[1]);
        uint32 value = 0;
        bool set = argc == 3;
        if (set)
                value = parse_expression(argv[2]);

        kprintf("radeon_hd register %#lx\n", reg);

        radeon_info &info = *gDeviceInfo[0];
        uint32 oldValue = read32(info.registers + reg);

        kprintf("  %svalue: %#lx (%lu)\n", set ? "old " : "", oldValue, oldValue);

        if (set) {
                write32(info.registers + reg, value);

                value = read32(info.registers + reg);
                kprintf("  new value: %#lx (%lu)\n", value, value);
        }

        return 0;
}
#endif  // DEBUG_COMMANDS


//      #pragma mark - Device Hooks


static status_t
device_open(const char* name, uint32 /*flags*/, void** _cookie)
{
        TRACE("%s: open(name = %s)\n", __func__, name);
        int32 id;

        // find accessed device
        {
                char* thisName;

                // search for device name
                for (id = 0; (thisName = gDeviceNames[id]) != NULL; id++) {
                        if (!strcmp(name, thisName))
                                break;
                }
                if (!thisName)
                        return B_BAD_VALUE;
        }

        radeon_info* info = gDeviceInfo[id];

        mutex_lock(&gLock);

        if (info->open_count == 0) {
                // This device hasn't been initialized yet, so we
                // allocate needed resources and initialize the structure
                info->init_status = radeon_hd_init(*info);
                if (info->init_status == B_OK) {
#ifdef DEBUG_COMMANDS
                        add_debugger_command("radeonhd_reg", getset_register,
                                "dumps or sets the specified radeon_hd register");
#endif
                }
        }

        if (info->init_status == B_OK) {
                info->open_count++;
                *_cookie = info;
        } else
                ERROR("%s: initialization failed!\n", __func__);

        mutex_unlock(&gLock);

        return info->init_status;
}


static status_t
device_close(void* /*data*/)
{
        TRACE("%s: close\n", __func__);
        return B_OK;
}


static status_t
device_free(void* data)
{
        struct radeon_info* info = (radeon_info*)data;

        mutex_lock(&gLock);

        if (info->open_count-- == 1) {
                // release info structure
                info->init_status = B_NO_INIT;
                radeon_hd_uninit(*info);

#ifdef DEBUG_COMMANDS
        remove_debugger_command("radeonhd_reg", getset_register);
#endif
        }

        mutex_unlock(&gLock);
        return B_OK;
}


static status_t
device_ioctl(void* data, uint32 op, void* buffer, size_t bufferLength)
{
        struct radeon_info* info = (radeon_info*)data;

        switch (op) {
                case B_GET_ACCELERANT_SIGNATURE:
                        TRACE("%s: accelerant: %s\n", __func__, RADEON_ACCELERANT_NAME);
                        if (user_strlcpy((char*)buffer, RADEON_ACCELERANT_NAME,
                                        bufferLength) < B_OK)
                                return B_BAD_ADDRESS;
                        return B_OK;

                // needed to share data between kernel and accelerant
                case RADEON_GET_PRIVATE_DATA:
                {
                        radeon_get_private_data data;
                        if (user_memcpy(&data, buffer, sizeof(radeon_get_private_data)) < B_OK)
                                return B_BAD_ADDRESS;

                        if (data.magic == RADEON_PRIVATE_DATA_MAGIC) {
                                data.shared_info_area = info->shared_area;
                                return user_memcpy(buffer, &data,
                                        sizeof(radeon_get_private_data));
                        }
                        break;
                }

                // needed for cloning
                case RADEON_GET_DEVICE_NAME:
                        if (user_strlcpy((char*)buffer, gDeviceNames[info->id],
                                        bufferLength) < B_OK)
                                return B_BAD_ADDRESS;
                        return B_OK;

                default:
                        TRACE("%s: ioctl() unknown message %" B_PRIu32 " (length = %ld)\n",
                                __func__, op, bufferLength);
                        break;
        }

        return B_DEV_INVALID_IOCTL;
}


static status_t
device_read(void* /*data*/, off_t /*pos*/,
        void* /*buffer*/, size_t *_length)
{
        *_length = 0;
        return B_NOT_ALLOWED;
}


static status_t
device_write(void* /*data*/, off_t /*pos*/,
        const void* /*buffer*/, size_t* _length)
{
        *_length = 0;
        return B_NOT_ALLOWED;
}