[deliverable/linux.git] / drivers / gpu / drm / drm_platform.c

/*
 * 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_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,
};

/**
 * Platform device initialization. Called direct from modules.
 *
 * \return zero on success or a negative number on failure.
 *
 * Initializes a drm_device structures,registering the
 * stubs
 *
 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
 * after the initialization for driver customization.
 */

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;
	return drm_get_platform_dev(platform_device, driver);
}
EXPORT_SYMBOL(drm_platform_init);
Commit	Line	Data
dcdb1674 JC	1	/*
	2	* Derived from drm_pci.c
	3	*
	4	* Copyright 2003 José Fonseca.
	5	* Copyright 2003 Leif Delgass.
	6	* Copyright (c) 2009, Code Aurora Forum.
	7	* All Rights Reserved.
	8	*
	9	* Permission is hereby granted, free of charge, to any person obtaining a
	10	* copy of this software and associated documentation files (the "Software"),
	11	* to deal in the Software without restriction, including without limitation
	12	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	13	* and/or sell copies of the Software, and to permit persons to whom the
	14	* Software is furnished to do so, subject to the following conditions:
	15	*
	16	* The above copyright notice and this permission notice (including the next
	17	* paragraph) shall be included in all copies or substantial portions of the
	18	* Software.
	19	*
	20	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	21	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	23	* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	24	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
	25	* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
	26	*/
	27
2d1a8a48	28	#include <linux/export.h>
760285e7	29	#include <drm/drmP.h>
dcdb1674	30
66cc8b6b	31	/*
dcdb1674 JC	32	* Register.
	33	*
	34	* \param platdev - Platform device struture
	35	* \return zero on success or a negative number on failure.
	36	*
	37	* Attempt to gets inter module "drm" information. If we are first
	38	* then register the character device and inter module information.
	39	* Try and register, if we fail to register, backout previous work.
	40	*/
	41
66cc8b6b LD	42	static int drm_get_platform_dev(struct platform_device *platdev,
66cc8b6b LD	43	struct drm_driver *driver)
dcdb1674 JC	44	{
	45	struct drm_device *dev;
	46	int ret;
	47
	48	DRM_DEBUG("\n");
	49
1bb72532	50	dev = drm_dev_alloc(driver, &platdev->dev);
dcdb1674 JC	51	if (!dev)
	52	return -ENOMEM;
	53
	54	dev->platformdev = platdev;
dcdb1674	55
c22f0ace	56	ret = drm_dev_register(dev, 0);
dcdb1674	57	if (ret)
c22f0ace	58	goto err_free;
b64c115e	59
dcdb1674 JC	60	DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
	61	driver->name, driver->major, driver->minor, driver->patchlevel,
	62	driver->date, dev->primary->index);
	63
	64	return 0;
	65
c22f0ace	66	err_free:
099d1c29	67	drm_dev_unref(dev);
dcdb1674 JC	68	return ret;
dcdb1674 JC	69	}
dcdb1674	70
8410ea3b DA	71	static int drm_platform_get_irq(struct drm_device *dev)
	72	{
	73	return platform_get_irq(dev->platformdev, 0);
	74	}
	75
	76	static const char drm_platform_get_name(struct drm_device dev)
	77	{
	78	return dev->platformdev->name;
	79	}
	80
	81	static int drm_platform_set_busid(struct drm_device dev, struct drm_master master)
	82	{
b19c19af	83	int len, ret, id;
8410ea3b	84
28a4a163 RC	85	master->unique_len = 13 + strlen(dev->platformdev->name);
28a4a163 RC	86	master->unique_size = master->unique_len;
8410ea3b DA	87	master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
	88
	89	if (master->unique == NULL)
	90	return -ENOMEM;
	91
b19c19af RC	92	id = dev->platformdev->id;
	93
	94	/* if only a single instance of the platform device, id will be
	95	* set to -1.. use 0 instead to avoid a funny looking bus-id:
	96	*/
	97	if (id == -1)
	98	id = 0;
	99
8410ea3b	100	len = snprintf(master->unique, master->unique_len,
b19c19af	101	"platform:%s:%02d", dev->platformdev->name, id);
8410ea3b DA	102
	103	if (len > master->unique_len) {
	104	DRM_ERROR("Unique buffer overflowed\n");
	105	ret = -EINVAL;
	106	goto err;
	107	}
	108
	109	dev->devname =
	110	kmalloc(strlen(dev->platformdev->name) +
	111	master->unique_len + 2, GFP_KERNEL);
	112
	113	if (dev->devname == NULL) {
	114	ret = -ENOMEM;
	115	goto err;
	116	}
	117
	118	sprintf(dev->devname, "%s@%s", dev->platformdev->name,
	119	master->unique);
	120	return 0;
	121	err:
	122	return ret;
	123	}
	124
	125	static struct drm_bus drm_platform_bus = {
	126	.bus_type = DRIVER_BUS_PLATFORM,
	127	.get_irq = drm_platform_get_irq,
	128	.get_name = drm_platform_get_name,
	129	.set_busid = drm_platform_set_busid,
	130	};
	131
dcdb1674	132	/**
8410ea3b	133	* Platform device initialization. Called direct from modules.
dcdb1674 JC	134	*
	135	* \return zero on success or a negative number on failure.
	136	*
	137	* Initializes a drm_device structures,registering the
	138	* stubs
	139	*
	140	* Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
	141	* after the initialization for driver customization.
	142	*/
	143
8410ea3b	144	int drm_platform_init(struct drm_driver driver, struct platform_device platform_device)
dcdb1674	145	{
8410ea3b DA	146	DRM_DEBUG("\n");
	147
	148	driver->kdriver.platform_device = platform_device;
	149	driver->bus = &drm_platform_bus;
8410ea3b DA	150	return drm_get_platform_dev(platform_device, driver);
	151	}
	152	EXPORT_SYMBOL(drm_platform_init);