drm_platform.c

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/*
 * Derived from drm_pci.c
 *
 * Copyright 2003 José Fonseca.
 * Copyright 2003 Leif Delgass.
 * Copyright (c) 2009, Code Aurora Forum.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <linux/export.h>
#include <drm/drmP.h>

int drm_get_platform_dev(struct platform_device *platdev,
             struct drm_driver *driver)
{
    struct drm_device *dev;
    int ret;

    DRM_DEBUG("\n");

    dev = kzalloc(sizeof(*dev), GFP_KERNEL);
    if (!dev)
        return -ENOMEM;

    dev->platformdev = platdev;
    dev->dev = &platdev->dev;

    mutex_lock(&drm_global_mutex);

    ret = drm_fill_in_dev(dev, NULL, driver);

    if (ret) {
        printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
        goto err_g1;
    }

    if (drm_core_check_feature(dev, DRIVER_MODESET)) {
        ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
        if (ret)
            goto err_g1;
    }

    ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY);
    if (ret)
        goto err_g2;

    if (dev->driver->load) {
        ret = dev->driver->load(dev, 0);
        if (ret)
            goto err_g3;
    }

    /* setup the grouping for the legacy output */
    if (drm_core_check_feature(dev, DRIVER_MODESET)) {
        ret = drm_mode_group_init_legacy_group(dev,
                &dev->primary->mode_group);
        if (ret)
            goto err_g3;
    }

    list_add_tail(&dev->driver_item, &driver->device_list);

    mutex_unlock(&drm_global_mutex);

    DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
         driver->name, driver->major, driver->minor, driver->patchlevel,
         driver->date, dev->primary->index);

    return 0;

err_g3:
    drm_put_minor(&dev->primary);
err_g2:
    if (drm_core_check_feature(dev, DRIVER_MODESET))
        drm_put_minor(&dev->control);
err_g1:
    kfree(dev);
    mutex_unlock(&drm_global_mutex);
    return ret;
}
EXPORT_SYMBOL(drm_get_platform_dev);

static int drm_platform_get_irq(struct drm_device *dev)
{
    return platform_get_irq(dev->platformdev, 0);
}

static const char *drm_platform_get_name(struct drm_device *dev)
{
    return dev->platformdev->name;
}

static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *master)
{
    int len, ret, id;

    master->unique_len = 13 + strlen(dev->platformdev->name);
    master->unique_size = master->unique_len;
    master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);

    if (master->unique == NULL)
        return -ENOMEM;

    id = dev->platformdev->id;

    /* if only a single instance of the platform device, id will be
     * set to -1.. use 0 instead to avoid a funny looking bus-id:
     */
    if (id == -1)
        id = 0;

    len = snprintf(master->unique, master->unique_len,
            "platform:%s:%02d", dev->platformdev->name, id);

    if (len > master->unique_len) {
        DRM_ERROR("Unique buffer overflowed\n");
        ret = -EINVAL;
        goto err;
    }

    dev->devname =
        kmalloc(strlen(dev->platformdev->name) +
            master->unique_len + 2, GFP_KERNEL);

    if (dev->devname == NULL) {
        ret = -ENOMEM;
        goto err;
    }

    sprintf(dev->devname, "%s@%s", dev->platformdev->name,
        master->unique);
    return 0;
err:
    return ret;
}

static struct drm_bus drm_platform_bus = {
    .bus_type = DRIVER_BUS_PLATFORM,
    .get_irq = drm_platform_get_irq,
    .get_name = drm_platform_get_name,
    .set_busid = drm_platform_set_busid,
};

int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device)
{
    DRM_DEBUG("\n");

    driver->kdriver.platform_device = platform_device;
    driver->bus = &drm_platform_bus;
    INIT_LIST_HEAD(&driver->device_list);
    return drm_get_platform_dev(platform_device, driver);
}
EXPORT_SYMBOL(drm_platform_init);

void drm_platform_exit(struct drm_driver *driver, struct platform_device *platform_device)
{
    struct drm_device *dev, *tmp;
    DRM_DEBUG("\n");

    list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item)
        drm_put_dev(dev);
    DRM_INFO("Module unloaded\n");
}
EXPORT_SYMBOL(drm_platform_exit);