[deliverable/linux.git] / drivers / fpga / fpga-mgr.c

/*
 * FPGA Manager Core
 *
 *  Copyright (C) 2013-2015 Altera Corporation
 *
 * With code from the mailing list:
 * Copyright (C) 2013 Xilinx, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <linux/firmware.h>
#include <linux/fpga/fpga-mgr.h>
#include <linux/idr.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/mutex.h>
#include <linux/slab.h>

static DEFINE_IDA(fpga_mgr_ida);
static struct class *fpga_mgr_class;

/**
 * fpga_mgr_buf_load - load fpga from image in buffer
 * @mgr:	fpga manager
 * @flags:	flags setting fpga confuration modes
 * @buf:	buffer contain fpga image
 * @count:	byte count of buf
 *
 * Step the low level fpga manager through the device-specific steps of getting
 * an FPGA ready to be configured, writing the image to it, then doing whatever
 * post-configuration steps necessary.  This code assumes the caller got the
 * mgr pointer from of_fpga_mgr_get() and checked that it is not an error code.
 *
 * Return: 0 on success, negative error code otherwise.
 */
int fpga_mgr_buf_load(struct fpga_manager *mgr, u32 flags, const char *buf,
		      size_t count)
{
	struct device *dev = &mgr->dev;
	int ret;

	/*
	 * Call the low level driver's write_init function.  This will do the
	 * device-specific things to get the FPGA into the state where it is
	 * ready to receive an FPGA image.
	 */
	mgr->state = FPGA_MGR_STATE_WRITE_INIT;
	ret = mgr->mops->write_init(mgr, flags, buf, count);
	if (ret) {
		dev_err(dev, "Error preparing FPGA for writing\n");
		mgr->state = FPGA_MGR_STATE_WRITE_INIT_ERR;
		return ret;
	}

	/*
	 * Write the FPGA image to the FPGA.
	 */
	mgr->state = FPGA_MGR_STATE_WRITE;
	ret = mgr->mops->write(mgr, buf, count);
	if (ret) {
		dev_err(dev, "Error while writing image data to FPGA\n");
		mgr->state = FPGA_MGR_STATE_WRITE_ERR;
		return ret;
	}

	/*
	 * After all the FPGA image has been written, do the device specific
	 * steps to finish and set the FPGA into operating mode.
	 */
	mgr->state = FPGA_MGR_STATE_WRITE_COMPLETE;
	ret = mgr->mops->write_complete(mgr, flags);
	if (ret) {
		dev_err(dev, "Error after writing image data to FPGA\n");
		mgr->state = FPGA_MGR_STATE_WRITE_COMPLETE_ERR;
		return ret;
	}
	mgr->state = FPGA_MGR_STATE_OPERATING;

	return 0;
}
EXPORT_SYMBOL_GPL(fpga_mgr_buf_load);

/**
 * fpga_mgr_firmware_load - request firmware and load to fpga
 * @mgr:	fpga manager
 * @flags:	flags setting fpga confuration modes
 * @image_name:	name of image file on the firmware search path
 *
 * Request an FPGA image using the firmware class, then write out to the FPGA.
 * Update the state before each step to provide info on what step failed if
 * there is a failure.  This code assumes the caller got the mgr pointer
 * from of_fpga_mgr_get() and checked that it is not an error code.
 *
 * Return: 0 on success, negative error code otherwise.
 */
int fpga_mgr_firmware_load(struct fpga_manager *mgr, u32 flags,
			   const char *image_name)
{
	struct device *dev = &mgr->dev;
	const struct firmware *fw;
	int ret;

	dev_info(dev, "writing %s to %s\n", image_name, mgr->name);

	mgr->state = FPGA_MGR_STATE_FIRMWARE_REQ;

	ret = request_firmware(&fw, image_name, dev);
	if (ret) {
		mgr->state = FPGA_MGR_STATE_FIRMWARE_REQ_ERR;
		dev_err(dev, "Error requesting firmware %s\n", image_name);
		return ret;
	}

	ret = fpga_mgr_buf_load(mgr, flags, fw->data, fw->size);
	if (ret)
		return ret;

	release_firmware(fw);

	return 0;
}
EXPORT_SYMBOL_GPL(fpga_mgr_firmware_load);

static const char * const state_str[] = {
	[FPGA_MGR_STATE_UNKNOWN] =		"unknown",
	[FPGA_MGR_STATE_POWER_OFF] =		"power off",
	[FPGA_MGR_STATE_POWER_UP] =		"power up",
	[FPGA_MGR_STATE_RESET] =		"reset",

	/* requesting FPGA image from firmware */
	[FPGA_MGR_STATE_FIRMWARE_REQ] =		"firmware request",
	[FPGA_MGR_STATE_FIRMWARE_REQ_ERR] =	"firmware request error",

	/* Preparing FPGA to receive image */
	[FPGA_MGR_STATE_WRITE_INIT] =		"write init",
	[FPGA_MGR_STATE_WRITE_INIT_ERR] =	"write init error",

	/* Writing image to FPGA */
	[FPGA_MGR_STATE_WRITE] =		"write",
	[FPGA_MGR_STATE_WRITE_ERR] =		"write error",

	/* Finishing configuration after image has been written */
	[FPGA_MGR_STATE_WRITE_COMPLETE] =	"write complete",
	[FPGA_MGR_STATE_WRITE_COMPLETE_ERR] =	"write complete error",

	/* FPGA reports to be in normal operating mode */
	[FPGA_MGR_STATE_OPERATING] =		"operating",
};

static ssize_t name_show(struct device *dev,
			 struct device_attribute *attr, char *buf)
{
	struct fpga_manager *mgr = to_fpga_manager(dev);

	return sprintf(buf, "%s\n", mgr->name);
}

static ssize_t state_show(struct device *dev,
			  struct device_attribute *attr, char *buf)
{
	struct fpga_manager *mgr = to_fpga_manager(dev);

	return sprintf(buf, "%s\n", state_str[mgr->state]);
}

static DEVICE_ATTR_RO(name);
static DEVICE_ATTR_RO(state);

static struct attribute *fpga_mgr_attrs[] = {
	&dev_attr_name.attr,
	&dev_attr_state.attr,
	NULL,
};
ATTRIBUTE_GROUPS(fpga_mgr);

static int fpga_mgr_of_node_match(struct device *dev, const void *data)
{
	return dev->of_node == data;
}

/**
 * of_fpga_mgr_get - get an exclusive reference to a fpga mgr
 * @node:	device node
 *
 * Given a device node, get an exclusive reference to a fpga mgr.
 *
 * Return: fpga manager struct or IS_ERR() condition containing error code.
 */
struct fpga_manager *of_fpga_mgr_get(struct device_node *node)
{
	struct fpga_manager *mgr;
	struct device *dev;
	int ret = -ENODEV;

	dev = class_find_device(fpga_mgr_class, NULL, node,
				fpga_mgr_of_node_match);
	if (!dev)
		return ERR_PTR(-ENODEV);

	mgr = to_fpga_manager(dev);
	if (!mgr)
		goto err_dev;

	/* Get exclusive use of fpga manager */
	if (!mutex_trylock(&mgr->ref_mutex)) {
		ret = -EBUSY;
		goto err_dev;
	}

	if (!try_module_get(dev->parent->driver->owner))
		goto err_ll_mod;

	return mgr;

err_ll_mod:
	mutex_unlock(&mgr->ref_mutex);
err_dev:
	put_device(dev);
	return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(of_fpga_mgr_get);

/**
 * fpga_mgr_put - release a reference to a fpga manager
 * @mgr:	fpga manager structure
 */
void fpga_mgr_put(struct fpga_manager *mgr)
{
	module_put(mgr->dev.parent->driver->owner);
	mutex_unlock(&mgr->ref_mutex);
	put_device(&mgr->dev);
}
EXPORT_SYMBOL_GPL(fpga_mgr_put);

/**
 * fpga_mgr_register - register a low level fpga manager driver
 * @dev:	fpga manager device from pdev
 * @name:	fpga manager name
 * @mops:	pointer to structure of fpga manager ops
 * @priv:	fpga manager private data
 *
 * Return: 0 on success, negative error code otherwise.
 */
int fpga_mgr_register(struct device *dev, const char *name,
		      const struct fpga_manager_ops *mops,
		      void *priv)
{
	struct fpga_manager *mgr;
	int id, ret;

	if (!mops || !mops->write_init || !mops->write ||
	    !mops->write_complete || !mops->state) {
		dev_err(dev, "Attempt to register without fpga_manager_ops\n");
		return -EINVAL;
	}

	if (!name || !strlen(name)) {
		dev_err(dev, "Attempt to register with no name!\n");
		return -EINVAL;
	}

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

	id = ida_simple_get(&fpga_mgr_ida, 0, 0, GFP_KERNEL);
	if (id < 0) {
		ret = id;
		goto error_kfree;
	}

	mutex_init(&mgr->ref_mutex);

	mgr->name = name;
	mgr->mops = mops;
	mgr->priv = priv;

	/*
	 * Initialize framework state by requesting low level driver read state
	 * from device.  FPGA may be in reset mode or may have been programmed
	 * by bootloader or EEPROM.
	 */
	mgr->state = mgr->mops->state(mgr);

	device_initialize(&mgr->dev);
	mgr->dev.class = fpga_mgr_class;
	mgr->dev.parent = dev;
	mgr->dev.of_node = dev->of_node;
	mgr->dev.id = id;
	dev_set_drvdata(dev, mgr);

	ret = dev_set_name(&mgr->dev, "fpga%d", id);
	if (ret)
		goto error_device;

	ret = device_add(&mgr->dev);
	if (ret)
		goto error_device;

	dev_info(&mgr->dev, "%s registered\n", mgr->name);

	return 0;

error_device:
	ida_simple_remove(&fpga_mgr_ida, id);
error_kfree:
	kfree(mgr);

	return ret;
}
EXPORT_SYMBOL_GPL(fpga_mgr_register);

/**
 * fpga_mgr_unregister - unregister a low level fpga manager driver
 * @dev:	fpga manager device from pdev
 */
void fpga_mgr_unregister(struct device *dev)
{
	struct fpga_manager *mgr = dev_get_drvdata(dev);

	dev_info(&mgr->dev, "%s %s\n", __func__, mgr->name);

	/*
	 * If the low level driver provides a method for putting fpga into
	 * a desired state upon unregister, do it.
	 */
	if (mgr->mops->fpga_remove)
		mgr->mops->fpga_remove(mgr);

	device_unregister(&mgr->dev);
}
EXPORT_SYMBOL_GPL(fpga_mgr_unregister);

static void fpga_mgr_dev_release(struct device *dev)
{
	struct fpga_manager *mgr = to_fpga_manager(dev);

	ida_simple_remove(&fpga_mgr_ida, mgr->dev.id);
	kfree(mgr);
}

static int __init fpga_mgr_class_init(void)
{
	pr_info("FPGA manager framework\n");

	fpga_mgr_class = class_create(THIS_MODULE, "fpga_manager");
	if (IS_ERR(fpga_mgr_class))
		return PTR_ERR(fpga_mgr_class);

	fpga_mgr_class->dev_groups = fpga_mgr_groups;
	fpga_mgr_class->dev_release = fpga_mgr_dev_release;

	return 0;
}

static void __exit fpga_mgr_class_exit(void)
{
	class_destroy(fpga_mgr_class);
	ida_destroy(&fpga_mgr_ida);
}

MODULE_AUTHOR("Alan Tull <atull@opensource.altera.com>");
MODULE_DESCRIPTION("FPGA manager framework");
MODULE_LICENSE("GPL v2");

subsys_initcall(fpga_mgr_class_init);
module_exit(fpga_mgr_class_exit);
Commit	Line	Data
6a8c3be7 AT	1	/*
	2	* FPGA Manager Core
	3	*
	4	* Copyright (C) 2013-2015 Altera Corporation
	5	*
	6	* With code from the mailing list:
	7	* Copyright (C) 2013 Xilinx, Inc.
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms and conditions of the GNU General Public License,
	11	* version 2, as published by the Free Software Foundation.
	12	*
	13	* This program is distributed in the hope it will be useful, but WITHOUT
	14	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	15	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	16	* more details.
	17	*
	18	* You should have received a copy of the GNU General Public License along with
	19	* this program. If not, see <http://www.gnu.org/licenses/>.
	20	*/
	21	#include <linux/firmware.h>
	22	#include <linux/fpga/fpga-mgr.h>
	23	#include <linux/idr.h>
	24	#include <linux/module.h>
	25	#include <linux/of.h>
	26	#include <linux/mutex.h>
	27	#include <linux/slab.h>
	28
	29	static DEFINE_IDA(fpga_mgr_ida);
	30	static struct class *fpga_mgr_class;
	31
	32	/**
	33	* fpga_mgr_buf_load - load fpga from image in buffer
	34	* @mgr: fpga manager
	35	* @flags: flags setting fpga confuration modes
	36	* @buf: buffer contain fpga image
	37	* @count: byte count of buf
	38	*
	39	* Step the low level fpga manager through the device-specific steps of getting
	40	* an FPGA ready to be configured, writing the image to it, then doing whatever
92d94a7e AT	41	* post-configuration steps necessary. This code assumes the caller got the
92d94a7e AT	42	* mgr pointer from of_fpga_mgr_get() and checked that it is not an error code.
6a8c3be7 AT	43	*
	44	* Return: 0 on success, negative error code otherwise.
	45	*/
	46	int fpga_mgr_buf_load(struct fpga_manager mgr, u32 flags, const char buf,
	47	size_t count)
	48	{
	49	struct device *dev = &mgr->dev;
	50	int ret;
	51
6a8c3be7 AT	52	/*
	53	* Call the low level driver's write_init function. This will do the
	54	* device-specific things to get the FPGA into the state where it is
	55	* ready to receive an FPGA image.
	56	*/
	57	mgr->state = FPGA_MGR_STATE_WRITE_INIT;
	58	ret = mgr->mops->write_init(mgr, flags, buf, count);
	59	if (ret) {
	60	dev_err(dev, "Error preparing FPGA for writing\n");
	61	mgr->state = FPGA_MGR_STATE_WRITE_INIT_ERR;
	62	return ret;
	63	}
	64
	65	/*
	66	* Write the FPGA image to the FPGA.
	67	*/
	68	mgr->state = FPGA_MGR_STATE_WRITE;
	69	ret = mgr->mops->write(mgr, buf, count);
	70	if (ret) {
	71	dev_err(dev, "Error while writing image data to FPGA\n");
	72	mgr->state = FPGA_MGR_STATE_WRITE_ERR;
	73	return ret;
	74	}
	75
	76	/*
	77	* After all the FPGA image has been written, do the device specific
	78	* steps to finish and set the FPGA into operating mode.
	79	*/
	80	mgr->state = FPGA_MGR_STATE_WRITE_COMPLETE;
	81	ret = mgr->mops->write_complete(mgr, flags);
	82	if (ret) {
	83	dev_err(dev, "Error after writing image data to FPGA\n");
	84	mgr->state = FPGA_MGR_STATE_WRITE_COMPLETE_ERR;
	85	return ret;
	86	}
	87	mgr->state = FPGA_MGR_STATE_OPERATING;
	88
	89	return 0;
	90	}
	91	EXPORT_SYMBOL_GPL(fpga_mgr_buf_load);
	92
	93	/**
	94	* fpga_mgr_firmware_load - request firmware and load to fpga
	95	* @mgr: fpga manager
	96	* @flags: flags setting fpga confuration modes
	97	* @image_name: name of image file on the firmware search path
	98	*
	99	* Request an FPGA image using the firmware class, then write out to the FPGA.
	100	* Update the state before each step to provide info on what step failed if
92d94a7e AT	101	* there is a failure. This code assumes the caller got the mgr pointer
92d94a7e AT	102	* from of_fpga_mgr_get() and checked that it is not an error code.
6a8c3be7 AT	103	*
	104	* Return: 0 on success, negative error code otherwise.
	105	*/
	106	int fpga_mgr_firmware_load(struct fpga_manager *mgr, u32 flags,
	107	const char *image_name)
	108	{
	109	struct device *dev = &mgr->dev;
	110	const struct firmware *fw;
	111	int ret;
	112
6a8c3be7 AT	113	dev_info(dev, "writing %s to %s\n", image_name, mgr->name);
	114
	115	mgr->state = FPGA_MGR_STATE_FIRMWARE_REQ;
	116
	117	ret = request_firmware(&fw, image_name, dev);
	118	if (ret) {
	119	mgr->state = FPGA_MGR_STATE_FIRMWARE_REQ_ERR;
	120	dev_err(dev, "Error requesting firmware %s\n", image_name);
	121	return ret;
	122	}
	123
	124	ret = fpga_mgr_buf_load(mgr, flags, fw->data, fw->size);
	125	if (ret)
	126	return ret;
	127
	128	release_firmware(fw);
	129
	130	return 0;
	131	}
	132	EXPORT_SYMBOL_GPL(fpga_mgr_firmware_load);
	133
	134	static const char * const state_str[] = {
	135	[FPGA_MGR_STATE_UNKNOWN] = "unknown",
	136	[FPGA_MGR_STATE_POWER_OFF] = "power off",
	137	[FPGA_MGR_STATE_POWER_UP] = "power up",
	138	[FPGA_MGR_STATE_RESET] = "reset",
	139
	140	/* requesting FPGA image from firmware */
	141	[FPGA_MGR_STATE_FIRMWARE_REQ] = "firmware request",
	142	[FPGA_MGR_STATE_FIRMWARE_REQ_ERR] = "firmware request error",
	143
	144	/* Preparing FPGA to receive image */
	145	[FPGA_MGR_STATE_WRITE_INIT] = "write init",
	146	[FPGA_MGR_STATE_WRITE_INIT_ERR] = "write init error",
	147
	148	/* Writing image to FPGA */
	149	[FPGA_MGR_STATE_WRITE] = "write",
	150	[FPGA_MGR_STATE_WRITE_ERR] = "write error",
	151
	152	/* Finishing configuration after image has been written */
	153	[FPGA_MGR_STATE_WRITE_COMPLETE] = "write complete",
	154	[FPGA_MGR_STATE_WRITE_COMPLETE_ERR] = "write complete error",
	155
	156	/* FPGA reports to be in normal operating mode */
	157	[FPGA_MGR_STATE_OPERATING] = "operating",
	158	};
	159
	160	static ssize_t name_show(struct device *dev,
	161	struct device_attribute attr, char buf)
	162	{
	163	struct fpga_manager *mgr = to_fpga_manager(dev);
	164
	165	return sprintf(buf, "%s\n", mgr->name);
	166	}
	167
	168	static ssize_t state_show(struct device *dev,
	169	struct device_attribute attr, char buf)
	170	{
	171	struct fpga_manager *mgr = to_fpga_manager(dev);
	172
	173	return sprintf(buf, "%s\n", state_str[mgr->state]);
	174	}
	175
	176	static DEVICE_ATTR_RO(name);
177	static DEVICE_ATTR_RO(state);
178
179	static struct attribute *fpga_mgr_attrs[] = {
180	&dev_attr_name.attr,
181	&dev_attr_state.attr,
182	NULL,
183	};
184	ATTRIBUTE_GROUPS(fpga_mgr);
185
186	static int fpga_mgr_of_node_match(struct device dev, const void data)
187	{
188	return dev->of_node == data;
189	}
190
191	/**
192	* of_fpga_mgr_get - get an exclusive reference to a fpga mgr
193	* @node: device node
194	*
195	* Given a device node, get an exclusive reference to a fpga mgr.
196	*
197	* Return: fpga manager struct or IS_ERR() condition containing error code.
198	*/
199	struct fpga_manager of_fpga_mgr_get(struct device_node node)
200	{
201	struct fpga_manager *mgr;
202	struct device *dev;
654ba4cc	203	int ret = -ENODEV;
6a8c3be7 AT	204
	205	dev = class_find_device(fpga_mgr_class, NULL, node,
	206	fpga_mgr_of_node_match);
	207	if (!dev)
	208	return ERR_PTR(-ENODEV);
	209
	210	mgr = to_fpga_manager(dev);
6a8c3be7	211	if (!mgr)
654ba4cc	212	goto err_dev;
6a8c3be7 AT	213
6a8c3be7 AT	214	/* Get exclusive use of fpga manager */
654ba4cc AT	215	if (!mutex_trylock(&mgr->ref_mutex)) {
	216	ret = -EBUSY;
	217	goto err_dev;
6a8c3be7 AT	218	}
6a8c3be7 AT	219
654ba4cc AT	220	if (!try_module_get(dev->parent->driver->owner))
	221	goto err_ll_mod;
	222
6a8c3be7	223	return mgr;
654ba4cc AT	224
	225	err_ll_mod:
	226	mutex_unlock(&mgr->ref_mutex);
	227	err_dev:
	228	put_device(dev);
	229	return ERR_PTR(ret);
6a8c3be7 AT	230	}
	231	EXPORT_SYMBOL_GPL(of_fpga_mgr_get);
	232
	233	/**
	234	* fpga_mgr_put - release a reference to a fpga manager
	235	* @mgr: fpga manager structure
	236	*/
	237	void fpga_mgr_put(struct fpga_manager *mgr)
	238	{
654ba4cc AT	239	module_put(mgr->dev.parent->driver->owner);
	240	mutex_unlock(&mgr->ref_mutex);
	241	put_device(&mgr->dev);
6a8c3be7 AT	242	}
	243	EXPORT_SYMBOL_GPL(fpga_mgr_put);
	244
	245	/**
	246	* fpga_mgr_register - register a low level fpga manager driver
	247	* @dev: fpga manager device from pdev
	248	* @name: fpga manager name
	249	* @mops: pointer to structure of fpga manager ops
	250	* @priv: fpga manager private data
	251	*
	252	* Return: 0 on success, negative error code otherwise.
	253	*/
	254	int fpga_mgr_register(struct device dev, const char name,
	255	const struct fpga_manager_ops *mops,
	256	void *priv)
	257	{
	258	struct fpga_manager *mgr;
6a8c3be7 AT	259	int id, ret;
	260
	261	if (!mops \|\| !mops->write_init \|\| !mops->write \|\|
	262	!mops->write_complete \|\| !mops->state) {
	263	dev_err(dev, "Attempt to register without fpga_manager_ops\n");
	264	return -EINVAL;
	265	}
	266
	267	if (!name \|\| !strlen(name)) {
	268	dev_err(dev, "Attempt to register with no name!\n");
	269	return -EINVAL;
	270	}
	271
	272	mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
	273	if (!mgr)
	274	return -ENOMEM;
	275
	276	id = ida_simple_get(&fpga_mgr_ida, 0, 0, GFP_KERNEL);
	277	if (id < 0) {
	278	ret = id;
	279	goto error_kfree;
	280	}
	281
	282	mutex_init(&mgr->ref_mutex);
	283
	284	mgr->name = name;
	285	mgr->mops = mops;
	286	mgr->priv = priv;
	287
	288	/*
	289	* Initialize framework state by requesting low level driver read state
	290	* from device. FPGA may be in reset mode or may have been programmed
	291	* by bootloader or EEPROM.
	292	*/
	293	mgr->state = mgr->mops->state(mgr);
	294
	295	device_initialize(&mgr->dev);
	296	mgr->dev.class = fpga_mgr_class;
	297	mgr->dev.parent = dev;
	298	mgr->dev.of_node = dev->of_node;
	299	mgr->dev.id = id;
	300	dev_set_drvdata(dev, mgr);
	301
07687c03 AT	302	ret = dev_set_name(&mgr->dev, "fpga%d", id);
	303	if (ret)
	304	goto error_device;
6a8c3be7 AT	305
	306	ret = device_add(&mgr->dev);
	307	if (ret)
	308	goto error_device;
	309
	310	dev_info(&mgr->dev, "%s registered\n", mgr->name);
	311
	312	return 0;
	313
	314	error_device:
	315	ida_simple_remove(&fpga_mgr_ida, id);
	316	error_kfree:
	317	kfree(mgr);
	318
	319	return ret;
	320	}
	321	EXPORT_SYMBOL_GPL(fpga_mgr_register);
	322
	323	/**
	324	* fpga_mgr_unregister - unregister a low level fpga manager driver
	325	* @dev: fpga manager device from pdev
	326	*/
	327	void fpga_mgr_unregister(struct device *dev)
	328	{
	329	struct fpga_manager *mgr = dev_get_drvdata(dev);
	330
	331	dev_info(&mgr->dev, "%s %s\n", __func__, mgr->name);
	332
	333	/*
	334	* If the low level driver provides a method for putting fpga into
	335	* a desired state upon unregister, do it.
	336	*/
	337	if (mgr->mops->fpga_remove)
	338	mgr->mops->fpga_remove(mgr);
	339
	340	device_unregister(&mgr->dev);
	341	}
	342	EXPORT_SYMBOL_GPL(fpga_mgr_unregister);
	343
	344	static void fpga_mgr_dev_release(struct device *dev)
	345	{
	346	struct fpga_manager *mgr = to_fpga_manager(dev);
	347
	348	ida_simple_remove(&fpga_mgr_ida, mgr->dev.id);
	349	kfree(mgr);
	350	}
	351
	352	static int __init fpga_mgr_class_init(void)
	353	{
	354	pr_info("FPGA manager framework\n");
	355
	356	fpga_mgr_class = class_create(THIS_MODULE, "fpga_manager");
	357	if (IS_ERR(fpga_mgr_class))
	358	return PTR_ERR(fpga_mgr_class);
	359
	360	fpga_mgr_class->dev_groups = fpga_mgr_groups;
	361	fpga_mgr_class->dev_release = fpga_mgr_dev_release;
	362
	363	return 0;
	364	}
	365
	366	static void __exit fpga_mgr_class_exit(void)
	367	{
	368	class_destroy(fpga_mgr_class);
369	ida_destroy(&fpga_mgr_ida);
370	}
371
372	MODULE_AUTHOR("Alan Tull <atull@opensource.altera.com>");
373	MODULE_DESCRIPTION("FPGA manager framework");
374	MODULE_LICENSE("GPL v2");
375
376	subsys_initcall(fpga_mgr_class_init);
377	module_exit(fpga_mgr_class_exit);