tifm_core.c

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/*
 *  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/slab.h>
#include <linux/init.h>
#include <linux/idr.h>
#include <linux/module.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_freezable_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);