drivers/misc/tifm_core.c - kernel/common - Git at Google

 /*
  *  tifm_core.c - TI FlashMedia driver
  *
  *  Copyright (C) 2006 Alex Dubov <[email protected]>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  */

 #include <linux/tifm.h>
 #include <linux/init.h>
 #include <linux/idr.h>

 #define DRIVER_NAME "tifm_core"
 #define DRIVER_VERSION "0.8"

 static struct workqueue_struct *workqueue;
 static DEFINE_IDR(tifm_adapter_idr);
 static DEFINE_SPINLOCK(tifm_adapter_lock);

 static const char *tifm_media_type_name(unsigned char type, unsigned char nt)
 {
 	const char *card_type_name[3][3] = {
 		{ "SmartMedia/xD", "MemoryStick", "MMC/SD" },
 		{ "XD", "MS", "SD"},
 		{ "xd", "ms", "sd"}
 	};

 	if (nt > 2 || type < 1 || type > 3)
 		return NULL;
 	return card_type_name[nt][type - 1];
 }

 static int tifm_dev_match(struct tifm_dev *sock, struct tifm_device_id *id)
 {
 	if (sock->type == id->type)
 		return 1;
 	return 0;
 }

 static int tifm_bus_match(struct device *dev, struct device_driver *drv)
 {
 	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
 	struct tifm_driver *fm_drv = container_of(drv, struct tifm_driver,
 						  driver);
 	struct tifm_device_id *ids = fm_drv->id_table;

 	if (ids) {
 		while (ids->type) {
 			if (tifm_dev_match(sock, ids))
 				return 1;
 			++ids;
 		}
 	}
 	return 0;
 }

 static int tifm_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
 	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);

 	if (add_uevent_var(env, "TIFM_CARD_TYPE=%s", tifm_media_type_name(sock->type, 1)))
 		return -ENOMEM;

 	return 0;
 }

 static int tifm_device_probe(struct device *dev)
 {
 	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
 	struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
 					       driver);
 	int rc = -ENODEV;

 	get_device(dev);
 	if (dev->driver && drv->probe) {
 		rc = drv->probe(sock);
 		if (!rc)
 			return 0;
 	}
 	put_device(dev);
 	return rc;
 }

 static void tifm_dummy_event(struct tifm_dev *sock)
 {
 	return;
 }

 static int tifm_device_remove(struct device *dev)
 {
 	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
 	struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
 					       driver);

 	if (dev->driver && drv->remove) {
 		sock->card_event = tifm_dummy_event;
 		sock->data_event = tifm_dummy_event;
 		drv->remove(sock);
 		sock->dev.driver = NULL;
 	}

 	put_device(dev);
 	return 0;
 }

 #ifdef CONFIG_PM

 static int tifm_device_suspend(struct device *dev, pm_message_t state)
 {
 	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
 	struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
 					       driver);

 	if (dev->driver && drv->suspend)
 		return drv->suspend(sock, state);
 	return 0;
 }

 static int tifm_device_resume(struct device *dev)
 {
 	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
 	struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
 					       driver);

 	if (dev->driver && drv->resume)
 		return drv->resume(sock);
 	return 0;
 }

 #else

 #define tifm_device_suspend NULL
 #define tifm_device_resume NULL

 #endif /* CONFIG_PM */

 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
 			 char *buf)
 {
 	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
 	return sprintf(buf, "%x", sock->type);
 }

 static struct device_attribute tifm_dev_attrs[] = {
 	__ATTR(type, S_IRUGO, type_show, NULL),
 	__ATTR_NULL
 };

 static struct bus_type tifm_bus_type = {
 	.name      = "tifm",
 	.dev_attrs = tifm_dev_attrs,
 	.match     = tifm_bus_match,
 	.uevent    = tifm_uevent,
 	.probe     = tifm_device_probe,
 	.remove    = tifm_device_remove,
 	.suspend   = tifm_device_suspend,
 	.resume    = tifm_device_resume
 };

 static void tifm_free(struct device *dev)
 {
 	struct tifm_adapter *fm = container_of(dev, struct tifm_adapter, dev);

 	kfree(fm);
 }

 static struct class tifm_adapter_class = {
 	.name    = "tifm_adapter",
 	.dev_release = tifm_free
 };

 struct tifm_adapter *tifm_alloc_adapter(unsigned int num_sockets,
 					struct device *dev)
 {
 	struct tifm_adapter *fm;

 	fm = kzalloc(sizeof(struct tifm_adapter)
 		     + sizeof(struct tifm_dev*) * num_sockets, GFP_KERNEL);
 	if (fm) {
 		fm->dev.class = &tifm_adapter_class;
 		fm->dev.parent = dev;
 		device_initialize(&fm->dev);
 		spin_lock_init(&fm->lock);
 		fm->num_sockets = num_sockets;
 	}
 	return fm;
 }
 EXPORT_SYMBOL(tifm_alloc_adapter);

 int tifm_add_adapter(struct tifm_adapter *fm)
 {
 	int rc;

 	if (!idr_pre_get(&tifm_adapter_idr, GFP_KERNEL))
 		return -ENOMEM;

 	spin_lock(&tifm_adapter_lock);
 	rc = idr_get_new(&tifm_adapter_idr, fm, &fm->id);
 	spin_unlock(&tifm_adapter_lock);
 	if (rc)
 		return rc;

 	dev_set_name(&fm->dev, "tifm%u", fm->id);
 	rc = device_add(&fm->dev);
 	if (rc) {
 		spin_lock(&tifm_adapter_lock);
 		idr_remove(&tifm_adapter_idr, fm->id);
 		spin_unlock(&tifm_adapter_lock);
 	}

 	return rc;
 }
 EXPORT_SYMBOL(tifm_add_adapter);

 void tifm_remove_adapter(struct tifm_adapter *fm)
 {
 	unsigned int cnt;

 	flush_workqueue(workqueue);
 	for (cnt = 0; cnt < fm->num_sockets; ++cnt) {
 		if (fm->sockets[cnt])
 			device_unregister(&fm->sockets[cnt]->dev);
 	}

 	spin_lock(&tifm_adapter_lock);
 	idr_remove(&tifm_adapter_idr, fm->id);
 	spin_unlock(&tifm_adapter_lock);
 	device_del(&fm->dev);
 }
 EXPORT_SYMBOL(tifm_remove_adapter);

 void tifm_free_adapter(struct tifm_adapter *fm)
 {
 	put_device(&fm->dev);
 }
 EXPORT_SYMBOL(tifm_free_adapter);

 void tifm_free_device(struct device *dev)
 {
 	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
 	kfree(sock);
 }
 EXPORT_SYMBOL(tifm_free_device);

 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm, unsigned int id,
 				   unsigned char type)
 {
 	struct tifm_dev *sock = NULL;

 	if (!tifm_media_type_name(type, 0))
 		return sock;

 	sock = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
 	if (sock) {
 		spin_lock_init(&sock->lock);
 		sock->type = type;
 		sock->socket_id = id;
 		sock->card_event = tifm_dummy_event;
 		sock->data_event = tifm_dummy_event;

 		sock->dev.parent = fm->dev.parent;
 		sock->dev.bus = &tifm_bus_type;
 		sock->dev.dma_mask = fm->dev.parent->dma_mask;
 		sock->dev.release = tifm_free_device;

 		dev_set_name(&sock->dev, "tifm_%s%u:%u",
 			     tifm_media_type_name(type, 2), fm->id, id);
 		printk(KERN_INFO DRIVER_NAME
 		       ": %s card detected in socket %u:%u\n",
 		       tifm_media_type_name(type, 0), fm->id, id);
 	}
 	return sock;
 }
 EXPORT_SYMBOL(tifm_alloc_device);

 void tifm_eject(struct tifm_dev *sock)
 {
 	struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
 	fm->eject(fm, sock);
 }
 EXPORT_SYMBOL(tifm_eject);

 int tifm_has_ms_pif(struct tifm_dev *sock)
 {
 	struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
 	return fm->has_ms_pif(fm, sock);
 }
 EXPORT_SYMBOL(tifm_has_ms_pif);

 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 		int direction)
 {
 	return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
 }
 EXPORT_SYMBOL(tifm_map_sg);

 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
 		   int direction)
 {
 	pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
 }
 EXPORT_SYMBOL(tifm_unmap_sg);

 void tifm_queue_work(struct work_struct *work)
 {
 	queue_work(workqueue, work);
 }
 EXPORT_SYMBOL(tifm_queue_work);

 int tifm_register_driver(struct tifm_driver *drv)
 {
 	drv->driver.bus = &tifm_bus_type;

 	return driver_register(&drv->driver);
 }
 EXPORT_SYMBOL(tifm_register_driver);

 void tifm_unregister_driver(struct tifm_driver *drv)
 {
 	driver_unregister(&drv->driver);
 }
 EXPORT_SYMBOL(tifm_unregister_driver);

 static int __init tifm_init(void)
 {
 	int rc;

 	workqueue = create_freezeable_workqueue("tifm");
 	if (!workqueue)
 		return -ENOMEM;

 	rc = bus_register(&tifm_bus_type);

 	if (rc)
 		goto err_out_wq;

 	rc = class_register(&tifm_adapter_class);
 	if (!rc)
 		return 0;

 	bus_unregister(&tifm_bus_type);

 err_out_wq:
 	destroy_workqueue(workqueue);

 	return rc;
 }

 static void __exit tifm_exit(void)
 {
 	class_unregister(&tifm_adapter_class);
 	bus_unregister(&tifm_bus_type);
 	destroy_workqueue(workqueue);
 }

 subsys_initcall(tifm_init);
 module_exit(tifm_exit);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Alex Dubov");
 MODULE_DESCRIPTION("TI FlashMedia core driver");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(DRIVER_VERSION);
	/*
	* tifm_core.c - TI FlashMedia driver
	*
	* Copyright (C) 2006 Alex Dubov <[email protected]>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	*/

	#include <linux/tifm.h>
	#include <linux/init.h>
	#include <linux/idr.h>

	#define DRIVER_NAME "tifm_core"
	#define DRIVER_VERSION "0.8"

	static struct workqueue_struct *workqueue;
	static DEFINE_IDR(tifm_adapter_idr);
	static DEFINE_SPINLOCK(tifm_adapter_lock);

	static const char *tifm_media_type_name(unsigned char type, unsigned char nt)
	{
	const char *card_type_name[3][3] = {
	{ "SmartMedia/xD", "MemoryStick", "MMC/SD" },
	{ "XD", "MS", "SD"},
	{ "xd", "ms", "sd"}
	};

	if (nt > 2 \|\| type < 1 \|\| type > 3)
	return NULL;
	return card_type_name[nt][type - 1];
	}

	static int tifm_dev_match(struct tifm_dev sock, struct tifm_device_id id)
	{
	if (sock->type == id->type)
	return 1;
	return 0;
	}

	static int tifm_bus_match(struct device dev, struct device_driver drv)
	{
	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
	struct tifm_driver *fm_drv = container_of(drv, struct tifm_driver,
	driver);
	struct tifm_device_id *ids = fm_drv->id_table;

	if (ids) {
	while (ids->type) {
	if (tifm_dev_match(sock, ids))
	return 1;
	++ids;
	}
	}
	return 0;
	}

	static int tifm_uevent(struct device dev, struct kobj_uevent_env env)
	{
	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);

	if (add_uevent_var(env, "TIFM_CARD_TYPE=%s", tifm_media_type_name(sock->type, 1)))
	return -ENOMEM;

	return 0;
	}

	static int tifm_device_probe(struct device *dev)
	{
	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
	struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
	driver);
	int rc = -ENODEV;

	get_device(dev);
	if (dev->driver && drv->probe) {
	rc = drv->probe(sock);
	if (!rc)
	return 0;
	}
	put_device(dev);
	return rc;
	}

	static void tifm_dummy_event(struct tifm_dev *sock)
	{
	return;
	}

	static int tifm_device_remove(struct device *dev)
	{
	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
	struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
	driver);

	if (dev->driver && drv->remove) {
	sock->card_event = tifm_dummy_event;
	sock->data_event = tifm_dummy_event;
	drv->remove(sock);
	sock->dev.driver = NULL;
	}

	put_device(dev);
	return 0;
	}

	#ifdef CONFIG_PM

	static int tifm_device_suspend(struct device *dev, pm_message_t state)
	{
	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
	struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
	driver);

	if (dev->driver && drv->suspend)
	return drv->suspend(sock, state);
	return 0;
	}

	static int tifm_device_resume(struct device *dev)
	{
	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
	struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
	driver);

	if (dev->driver && drv->resume)
	return drv->resume(sock);
	return 0;
	}

	#else

	#define tifm_device_suspend NULL
	#define tifm_device_resume NULL

	#endif /* CONFIG_PM */

	static ssize_t type_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
	return sprintf(buf, "%x", sock->type);
	}

	static struct device_attribute tifm_dev_attrs[] = {
	__ATTR(type, S_IRUGO, type_show, NULL),
	__ATTR_NULL
	};

	static struct bus_type tifm_bus_type = {
	.name = "tifm",
	.dev_attrs = tifm_dev_attrs,
	.match = tifm_bus_match,
	.uevent = tifm_uevent,
	.probe = tifm_device_probe,
	.remove = tifm_device_remove,
	.suspend = tifm_device_suspend,
	.resume = tifm_device_resume
	};

	static void tifm_free(struct device *dev)
	{
	struct tifm_adapter *fm = container_of(dev, struct tifm_adapter, dev);

	kfree(fm);
	}

	static struct class tifm_adapter_class = {
	.name = "tifm_adapter",
	.dev_release = tifm_free
	};

	struct tifm_adapter *tifm_alloc_adapter(unsigned int num_sockets,
	struct device *dev)
	{
	struct tifm_adapter *fm;

	fm = kzalloc(sizeof(struct tifm_adapter)
	+ sizeof(struct tifm_dev) num_sockets, GFP_KERNEL);
	if (fm) {
	fm->dev.class = &tifm_adapter_class;
	fm->dev.parent = dev;
	device_initialize(&fm->dev);
	spin_lock_init(&fm->lock);
	fm->num_sockets = num_sockets;
	}
	return fm;
	}
	EXPORT_SYMBOL(tifm_alloc_adapter);

	int tifm_add_adapter(struct tifm_adapter *fm)
	{
	int rc;

	if (!idr_pre_get(&tifm_adapter_idr, GFP_KERNEL))
	return -ENOMEM;

	spin_lock(&tifm_adapter_lock);
	rc = idr_get_new(&tifm_adapter_idr, fm, &fm->id);
	spin_unlock(&tifm_adapter_lock);
	if (rc)
	return rc;

	dev_set_name(&fm->dev, "tifm%u", fm->id);
	rc = device_add(&fm->dev);
	if (rc) {
	spin_lock(&tifm_adapter_lock);
	idr_remove(&tifm_adapter_idr, fm->id);
	spin_unlock(&tifm_adapter_lock);
	}

	return rc;
	}
	EXPORT_SYMBOL(tifm_add_adapter);

	void tifm_remove_adapter(struct tifm_adapter *fm)
	{
	unsigned int cnt;

	flush_workqueue(workqueue);
	for (cnt = 0; cnt < fm->num_sockets; ++cnt) {
	if (fm->sockets[cnt])
	device_unregister(&fm->sockets[cnt]->dev);
	}

	spin_lock(&tifm_adapter_lock);
	idr_remove(&tifm_adapter_idr, fm->id);
	spin_unlock(&tifm_adapter_lock);
	device_del(&fm->dev);
	}
	EXPORT_SYMBOL(tifm_remove_adapter);

	void tifm_free_adapter(struct tifm_adapter *fm)
	{
	put_device(&fm->dev);
	}
	EXPORT_SYMBOL(tifm_free_adapter);

	void tifm_free_device(struct device *dev)
	{
	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
	kfree(sock);
	}
	EXPORT_SYMBOL(tifm_free_device);

	struct tifm_dev tifm_alloc_device(struct tifm_adapter fm, unsigned int id,
	unsigned char type)
	{
	struct tifm_dev *sock = NULL;

	if (!tifm_media_type_name(type, 0))
	return sock;

	sock = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
	if (sock) {
	spin_lock_init(&sock->lock);
	sock->type = type;
	sock->socket_id = id;
	sock->card_event = tifm_dummy_event;
	sock->data_event = tifm_dummy_event;

	sock->dev.parent = fm->dev.parent;
	sock->dev.bus = &tifm_bus_type;
	sock->dev.dma_mask = fm->dev.parent->dma_mask;
	sock->dev.release = tifm_free_device;

	dev_set_name(&sock->dev, "tifm_%s%u:%u",
	tifm_media_type_name(type, 2), fm->id, id);
	printk(KERN_INFO DRIVER_NAME
	": %s card detected in socket %u:%u\n",
	tifm_media_type_name(type, 0), fm->id, id);
	}
	return sock;
	}
	EXPORT_SYMBOL(tifm_alloc_device);

	void tifm_eject(struct tifm_dev *sock)
	{
	struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
	fm->eject(fm, sock);
	}
	EXPORT_SYMBOL(tifm_eject);

	int tifm_has_ms_pif(struct tifm_dev *sock)
	{
	struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
	return fm->has_ms_pif(fm, sock);
	}
	EXPORT_SYMBOL(tifm_has_ms_pif);

	int tifm_map_sg(struct tifm_dev sock, struct scatterlist sg, int nents,
	int direction)
	{
	return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
	}
	EXPORT_SYMBOL(tifm_map_sg);

	void tifm_unmap_sg(struct tifm_dev sock, struct scatterlist sg, int nents,
	int direction)
	{
	pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
	}
	EXPORT_SYMBOL(tifm_unmap_sg);

	void tifm_queue_work(struct work_struct *work)
	{
	queue_work(workqueue, work);
	}
	EXPORT_SYMBOL(tifm_queue_work);

	int tifm_register_driver(struct tifm_driver *drv)
	{
	drv->driver.bus = &tifm_bus_type;

	return driver_register(&drv->driver);
	}
	EXPORT_SYMBOL(tifm_register_driver);

	void tifm_unregister_driver(struct tifm_driver *drv)
	{
	driver_unregister(&drv->driver);
	}
	EXPORT_SYMBOL(tifm_unregister_driver);

	static int __init tifm_init(void)
	{
	int rc;

	workqueue = create_freezeable_workqueue("tifm");
	if (!workqueue)
	return -ENOMEM;

	rc = bus_register(&tifm_bus_type);

	if (rc)
	goto err_out_wq;

	rc = class_register(&tifm_adapter_class);
	if (!rc)
	return 0;

	bus_unregister(&tifm_bus_type);

	err_out_wq:
	destroy_workqueue(workqueue);

	return rc;
	}

	static void __exit tifm_exit(void)
	{
	class_unregister(&tifm_adapter_class);
	bus_unregister(&tifm_bus_type);
	destroy_workqueue(workqueue);
	}

	subsys_initcall(tifm_init);
	module_exit(tifm_exit);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Alex Dubov");
	MODULE_DESCRIPTION("TI FlashMedia core driver");
	MODULE_LICENSE("GPL");
	MODULE_VERSION(DRIVER_VERSION);