diff options
Diffstat (limited to 'drivers/gpu/drm/drm_platform.c')
| -rw-r--r-- | drivers/gpu/drm/drm_platform.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_platform.c b/drivers/gpu/drm/drm_platform.c new file mode 100644 index 00000000000..d5b76f148c1 --- /dev/null +++ b/drivers/gpu/drm/drm_platform.c @@ -0,0 +1,126 @@ +/* + * 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> + +/* + * Register. + * + * \param platdev - Platform device struture + * \return zero on success or a negative number on failure. + * + * Attempt to gets inter module "drm" information. If we are first + * then register the character device and inter module information. + * Try and register, if we fail to register, backout previous work. + */ + +static int drm_get_platform_dev(struct platform_device *platdev, + struct drm_driver *driver) +{ + struct drm_device *dev; + int ret; + + DRM_DEBUG("\n"); + + dev = drm_dev_alloc(driver, &platdev->dev); + if (!dev) + return -ENOMEM; + + dev->platformdev = platdev; + + ret = drm_dev_register(dev, 0); + if (ret) + goto err_free; + + 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_free: + drm_dev_unref(dev); + return ret; +} + +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; + } + + return 0; +err: + return ret; +} + +static struct drm_bus drm_platform_bus = { + .set_busid = drm_platform_set_busid, +}; + +/** + * drm_platform_init - Register a platform device with the DRM subsystem + * @driver: DRM device driver + * @platform_device: platform device to register + * + * Registers the specified DRM device driver and platform device with the DRM + * subsystem, initializing a drm_device structure and calling the driver's + * .load() function. + * + * Return: 0 on success or a negative error code on failure. + */ +int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device) +{ + DRM_DEBUG("\n"); + + driver->bus = &drm_platform_bus; + return drm_get_platform_dev(platform_device, driver); +} +EXPORT_SYMBOL(drm_platform_init); |