ds.c

linux 内核源代码

#endif

	while (did && did->match_flags) {
		ds_dbg(3, "trying to match %s to %s\n", dev->bus_id,
		       drv->name);
		if (pcmcia_devmatch(p_dev, did)) {
			ds_dbg(0, "matched %s to %s\n", dev->bus_id,
			       drv->name);
			return 1;
		}
		did++;
	}

	return 0;
}

#ifdef CONFIG_HOTPLUG

static int pcmcia_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct pcmcia_device *p_dev;
	int i;
	u32 hash[4] = { 0, 0, 0, 0};

	if (!dev)
		return -ENODEV;

	p_dev = to_pcmcia_dev(dev);

	/* calculate hashes */
	for (i=0; i<4; i++) {
		if (!p_dev->prod_id[i])
			continue;
		hash[i] = crc32(0, p_dev->prod_id[i], strlen(p_dev->prod_id[i]));
	}

	if (add_uevent_var(env, "SOCKET_NO=%u", p_dev->socket->sock))
		return -ENOMEM;

	if (add_uevent_var(env, "DEVICE_NO=%02X", p_dev->device_no))
		return -ENOMEM;

	if (add_uevent_var(env, "MODALIAS=pcmcia:m%04Xc%04Xf%02Xfn%02Xpfn%02X"
			   "pa%08Xpb%08Xpc%08Xpd%08X",
			   p_dev->has_manf_id ? p_dev->manf_id : 0,
			   p_dev->has_card_id ? p_dev->card_id : 0,
			   p_dev->has_func_id ? p_dev->func_id : 0,
			   p_dev->func,
			   p_dev->device_no,
			   hash[0],
			   hash[1],
			   hash[2],
			   hash[3]))
		return -ENOMEM;

	return 0;
}

#else

static int pcmcia_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	return -ENODEV;
}

#endif

/************************ runtime PM support ***************************/

static int pcmcia_dev_suspend(struct device *dev, pm_message_t state);
static int pcmcia_dev_resume(struct device *dev);

static int runtime_suspend(struct device *dev)
{
	int rc;

	down(&dev->sem);
	rc = pcmcia_dev_suspend(dev, PMSG_SUSPEND);
	up(&dev->sem);
	if (!rc)
		dev->power.power_state.event = PM_EVENT_SUSPEND;
	return rc;
}

static void runtime_resume(struct device *dev)
{
	int rc;

	down(&dev->sem);
	rc = pcmcia_dev_resume(dev);
	up(&dev->sem);
	if (!rc)
		dev->power.power_state.event = PM_EVENT_ON;
}

/************************ per-device sysfs output ***************************/

#define pcmcia_device_attr(field, test, format)				\
static ssize_t field##_show (struct device *dev, struct device_attribute *attr, char *buf)		\
{									\
	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);		\
	return p_dev->test ? sprintf (buf, format, p_dev->field) : -ENODEV; \
}

#define pcmcia_device_stringattr(name, field)					\
static ssize_t name##_show (struct device *dev, struct device_attribute *attr, char *buf)		\
{									\
	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);		\
	return p_dev->field ? sprintf (buf, "%s\n", p_dev->field) : -ENODEV; \
}

pcmcia_device_attr(func, socket, "0x%02x\n");
pcmcia_device_attr(func_id, has_func_id, "0x%02x\n");
pcmcia_device_attr(manf_id, has_manf_id, "0x%04x\n");
pcmcia_device_attr(card_id, has_card_id, "0x%04x\n");
pcmcia_device_stringattr(prod_id1, prod_id[0]);
pcmcia_device_stringattr(prod_id2, prod_id[1]);
pcmcia_device_stringattr(prod_id3, prod_id[2]);
pcmcia_device_stringattr(prod_id4, prod_id[3]);


static ssize_t pcmcia_show_pm_state(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);

	if (p_dev->suspended)
		return sprintf(buf, "off\n");
	else
		return sprintf(buf, "on\n");
}

static ssize_t pcmcia_store_pm_state(struct device *dev, struct device_attribute *attr,
				     const char *buf, size_t count)
{
	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
	int ret = 0;

        if (!count)
                return -EINVAL;

	if ((!p_dev->suspended) && !strncmp(buf, "off", 3))
		ret = runtime_suspend(dev);
	else if (p_dev->suspended && !strncmp(buf, "on", 2))
		runtime_resume(dev);

	return ret ? ret : count;
}


static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
	int i;
	u32 hash[4] = { 0, 0, 0, 0};

	/* calculate hashes */
	for (i=0; i<4; i++) {
		if (!p_dev->prod_id[i])
			continue;
		hash[i] = crc32(0,p_dev->prod_id[i],strlen(p_dev->prod_id[i]));
	}
	return sprintf(buf, "pcmcia:m%04Xc%04Xf%02Xfn%02Xpfn%02X"
				"pa%08Xpb%08Xpc%08Xpd%08X\n",
				p_dev->has_manf_id ? p_dev->manf_id : 0,
				p_dev->has_card_id ? p_dev->card_id : 0,
				p_dev->has_func_id ? p_dev->func_id : 0,
				p_dev->func, p_dev->device_no,
				hash[0], hash[1], hash[2], hash[3]);
}

static ssize_t pcmcia_store_allow_func_id_match(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
	int ret;

	if (!count)
		return -EINVAL;

	mutex_lock(&p_dev->socket->skt_mutex);
	p_dev->allow_func_id_match = 1;
	mutex_unlock(&p_dev->socket->skt_mutex);

	ret = bus_rescan_devices(&pcmcia_bus_type);
	if (ret)
		printk(KERN_INFO "pcmcia: bus_rescan_devices failed after "
		       "allowing func_id matches\n");

	return count;
}

static struct device_attribute pcmcia_dev_attrs[] = {
	__ATTR(function, 0444, func_show, NULL),
	__ATTR(pm_state, 0644, pcmcia_show_pm_state, pcmcia_store_pm_state),
	__ATTR_RO(func_id),
	__ATTR_RO(manf_id),
	__ATTR_RO(card_id),
	__ATTR_RO(prod_id1),
	__ATTR_RO(prod_id2),
	__ATTR_RO(prod_id3),
	__ATTR_RO(prod_id4),
	__ATTR_RO(modalias),
	__ATTR(allow_func_id_match, 0200, NULL, pcmcia_store_allow_func_id_match),
	__ATTR_NULL,
};

/* PM support, also needed for reset */

static int pcmcia_dev_suspend(struct device * dev, pm_message_t state)
{
	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
	struct pcmcia_driver *p_drv = NULL;
	int ret = 0;

	ds_dbg(2, "suspending %s\n", dev->bus_id);

	if (dev->driver)
		p_drv = to_pcmcia_drv(dev->driver);

	if (!p_drv)
		goto out;

	if (p_drv->suspend) {
		ret = p_drv->suspend(p_dev);
		if (ret) {
			printk(KERN_ERR "pcmcia: device %s (driver %s) did "
			       "not want to go to sleep (%d)\n",
			       p_dev->devname, p_drv->drv.name, ret);
			goto out;
		}
	}

	if (p_dev->device_no == p_dev->func) {
		ds_dbg(2, "releasing configuration for %s\n", dev->bus_id);
		pcmcia_release_configuration(p_dev);
	}

 out:
	if (!ret)
		p_dev->suspended = 1;
	return ret;
}


static int pcmcia_dev_resume(struct device * dev)
{
	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
        struct pcmcia_driver *p_drv = NULL;
	int ret = 0;

	ds_dbg(2, "resuming %s\n", dev->bus_id);

	if (dev->driver)
		p_drv = to_pcmcia_drv(dev->driver);

	if (!p_drv)
		goto out;

	if (p_dev->device_no == p_dev->func) {
		ds_dbg(2, "requesting configuration for %s\n", dev->bus_id);
		ret = pcmcia_request_configuration(p_dev, &p_dev->conf);
		if (ret)
			goto out;
	}

	if (p_drv->resume)
		ret = p_drv->resume(p_dev);

 out:
	if (!ret)
		p_dev->suspended = 0;
	return ret;
}


static int pcmcia_bus_suspend_callback(struct device *dev, void * _data)
{
	struct pcmcia_socket *skt = _data;
	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);

	if (p_dev->socket != skt || p_dev->suspended)
		return 0;

	return runtime_suspend(dev);
}

static int pcmcia_bus_resume_callback(struct device *dev, void * _data)
{
	struct pcmcia_socket *skt = _data;
	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);

	if (p_dev->socket != skt || !p_dev->suspended)
		return 0;

	runtime_resume(dev);

	return 0;
}

static int pcmcia_bus_resume(struct pcmcia_socket *skt)
{
	ds_dbg(2, "resuming socket %d\n", skt->sock);
	bus_for_each_dev(&pcmcia_bus_type, NULL, skt, pcmcia_bus_resume_callback);
	return 0;
}

static int pcmcia_bus_suspend(struct pcmcia_socket *skt)
{
	ds_dbg(2, "suspending socket %d\n", skt->sock);
	if (bus_for_each_dev(&pcmcia_bus_type, NULL, skt,
			     pcmcia_bus_suspend_callback)) {
		pcmcia_bus_resume(skt);
		return -EIO;
	}
	return 0;
}


/*======================================================================

    The card status event handler.
    
======================================================================*/

/* Normally, the event is passed to individual drivers after
 * informing userspace. Only for CS_EVENT_CARD_REMOVAL this
 * is inversed to maintain historic compatibility.
 */

static int ds_event(struct pcmcia_socket *skt, event_t event, int priority)
{
	struct pcmcia_socket *s = pcmcia_get_socket(skt);

	if (!s) {
		printk(KERN_ERR "PCMCIA obtaining reference to socket %p " \
			"failed, event 0x%x lost!\n", skt, event);
		return -ENODEV;
	}

	ds_dbg(1, "ds_event(0x%06x, %d, 0x%p)\n",
	       event, priority, skt);

	switch (event) {
	case CS_EVENT_CARD_REMOVAL:
		s->pcmcia_state.present = 0;
		pcmcia_card_remove(skt, NULL);
		handle_event(skt, event);
		break;

	case CS_EVENT_CARD_INSERTION:
		s->pcmcia_state.present = 1;
		pcmcia_card_add(skt);
		handle_event(skt, event);
		break;

	case CS_EVENT_EJECTION_REQUEST:
		break;

	case CS_EVENT_PM_SUSPEND:
	case CS_EVENT_PM_RESUME:
	case CS_EVENT_RESET_PHYSICAL:
	case CS_EVENT_CARD_RESET:
	default:
		handle_event(skt, event);
		break;
    }

    pcmcia_put_socket(s);

    return 0;
} /* ds_event */


struct pcmcia_device * pcmcia_dev_present(struct pcmcia_device *_p_dev)
{
	struct pcmcia_device *p_dev;
	struct pcmcia_device *ret = NULL;

	p_dev = pcmcia_get_dev(_p_dev);
	if (!p_dev)
		return NULL;

	if (!p_dev->socket->pcmcia_state.present)
		goto out;

	if (p_dev->_removed)
		goto out;

	if (p_dev->suspended)
		goto out;

	ret = p_dev;
 out:
	pcmcia_put_dev(p_dev);
	return ret;
}
EXPORT_SYMBOL(pcmcia_dev_present);


static struct pcmcia_callback pcmcia_bus_callback = {
	.owner = THIS_MODULE,
	.event = ds_event,
	.requery = pcmcia_bus_rescan,
	.suspend = pcmcia_bus_suspend,
	.resume = pcmcia_bus_resume,
};

static int __devinit pcmcia_bus_add_socket(struct device *dev,
					   struct class_interface *class_intf)
{
	struct pcmcia_socket *socket = dev_get_drvdata(dev);
	int ret;

	socket = pcmcia_get_socket(socket);
	if (!socket) {
		printk(KERN_ERR "PCMCIA obtaining reference to socket %p failed\n", socket);
		return -ENODEV;
	}

	/*
	 * Ugly. But we want to wait for the socket threads to have started up.
	 * We really should let the drivers themselves drive some of this..
	 */
	msleep(250);

#ifdef CONFIG_PCMCIA_IOCTL
	init_waitqueue_head(&socket->queue);
#endif
	INIT_LIST_HEAD(&socket->devices_list);
	INIT_WORK(&socket->device_add, pcmcia_delayed_add_device);
	memset(&socket->pcmcia_state, 0, sizeof(u8));
	socket->device_count = 0;

	ret = pccard_register_pcmcia(socket, &pcmcia_bus_callback);
	if (ret) {
		printk(KERN_ERR "PCMCIA registration PCCard core failed for socket %p\n", socket);
		pcmcia_put_socket(socket);
		return (ret);
	}

	return 0;
}

static void pcmcia_bus_remove_socket(struct device *dev,
				     struct class_interface *class_intf)
{
	struct pcmcia_socket *socket = dev_get_drvdata(dev);

	if (!socket)
		return;

	socket->pcmcia_state.dead = 1;
	pccard_register_pcmcia(socket, NULL);

	/* unregister any unbound devices */
	mutex_lock(&socket->skt_mutex);
	pcmcia_card_remove(socket, NULL);
	mutex_unlock(&socket->skt_mutex);

	pcmcia_put_socket(socket);

	return;
}


/* the pcmcia_bus_interface is used to handle pcmcia socket devices */
static struct class_interface pcmcia_bus_interface = {
	.class = &pcmcia_socket_class,
	.add_dev = &pcmcia_bus_add_socket,
	.remove_dev = &pcmcia_bus_remove_socket,
};


struct bus_type pcmcia_bus_type = {
	.name = "pcmcia",
	.uevent = pcmcia_bus_uevent,
	.match = pcmcia_bus_match,
	.dev_attrs = pcmcia_dev_attrs,
	.probe = pcmcia_device_probe,
	.remove = pcmcia_device_remove,
	.suspend = pcmcia_dev_suspend,
	.resume = pcmcia_dev_resume,
};


static int __init init_pcmcia_bus(void)
{
	int ret;

	spin_lock_init(&pcmcia_dev_list_lock);

	ret = bus_register(&pcmcia_bus_type);
	if (ret < 0) {
		printk(KERN_WARNING "pcmcia: bus_register error: %d\n", ret);
		return ret;
	}
	ret = class_interface_register(&pcmcia_bus_interface);
	if (ret < 0) {
		printk(KERN_WARNING
			"pcmcia: class_interface_register error: %d\n", ret);
		bus_unregister(&pcmcia_bus_type);
		return ret;
	}

	pcmcia_setup_ioctl();

	return 0;
}
fs_initcall(init_pcmcia_bus); /* one level after subsys_initcall so that 
			       * pcmcia_socket_class is already registered */


static void __exit exit_pcmcia_bus(void)
{
	pcmcia_cleanup_ioctl();

	class_interface_unregister(&pcmcia_bus_interface);

	bus_unregister(&pcmcia_bus_type);
}
module_exit(exit_pcmcia_bus);


MODULE_ALIAS("ds");