ds.c

linux 内核源代码

	 * pseudo multi-function card, we need to unbind
	 * all devices
	 */
	did = p_dev->dev.driver_data;
	if (did && (did->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO) &&
	    (p_dev->socket->device_count != 0) &&
	    (p_dev->device_no == 0))
		pcmcia_card_remove(p_dev->socket, p_dev);

	/* detach the "instance" */
	if (!p_drv)
		return 0;

	if (p_drv->remove)
	       	p_drv->remove(p_dev);

	p_dev->dev_node = NULL;

	/* check for proper unloading */
	if (p_dev->_irq || p_dev->_io || p_dev->_locked)
		printk(KERN_INFO "pcmcia: driver %s did not release config properly\n",
		       p_drv->drv.name);

	for (i = 0; i < MAX_WIN; i++)
		if (p_dev->_win & CLIENT_WIN_REQ(i))
			printk(KERN_INFO "pcmcia: driver %s did not release windows properly\n",
			       p_drv->drv.name);

	/* references from pcmcia_probe_device */
	pcmcia_put_dev(p_dev);
	module_put(p_drv->owner);

	return 0;
}


/*
 * pcmcia_device_query -- determine information about a pcmcia device
 */
static int pcmcia_device_query(struct pcmcia_device *p_dev)
{
	cistpl_manfid_t manf_id;
	cistpl_funcid_t func_id;
	cistpl_vers_1_t	*vers1;
	unsigned int i;

	vers1 = kmalloc(sizeof(*vers1), GFP_KERNEL);
	if (!vers1)
		return -ENOMEM;

	if (!pccard_read_tuple(p_dev->socket, p_dev->func,
			       CISTPL_MANFID, &manf_id)) {
		p_dev->manf_id = manf_id.manf;
		p_dev->card_id = manf_id.card;
		p_dev->has_manf_id = 1;
		p_dev->has_card_id = 1;
	}

	if (!pccard_read_tuple(p_dev->socket, p_dev->func,
			       CISTPL_FUNCID, &func_id)) {
		p_dev->func_id = func_id.func;
		p_dev->has_func_id = 1;
	} else {
		/* rule of thumb: cards with no FUNCID, but with
		 * common memory device geometry information, are
		 * probably memory cards (from pcmcia-cs) */
		cistpl_device_geo_t *devgeo;

		devgeo = kmalloc(sizeof(*devgeo), GFP_KERNEL);
		if (!devgeo) {
			kfree(vers1);
			return -ENOMEM;
		}
		if (!pccard_read_tuple(p_dev->socket, p_dev->func,
				      CISTPL_DEVICE_GEO, devgeo)) {
			ds_dbg(0, "mem device geometry probably means "
			       "FUNCID_MEMORY\n");
			p_dev->func_id = CISTPL_FUNCID_MEMORY;
			p_dev->has_func_id = 1;
		}
		kfree(devgeo);
	}

	if (!pccard_read_tuple(p_dev->socket, p_dev->func, CISTPL_VERS_1,
			       vers1)) {
		for (i=0; i < vers1->ns; i++) {
			char *tmp;
			unsigned int length;

			tmp = vers1->str + vers1->ofs[i];

			length = strlen(tmp) + 1;
			if ((length < 2) || (length > 255))
				continue;

			p_dev->prod_id[i] = kmalloc(sizeof(char) * length,
						    GFP_KERNEL);
			if (!p_dev->prod_id[i])
				continue;

			p_dev->prod_id[i] = strncpy(p_dev->prod_id[i],
						    tmp, length);
		}
	}

	kfree(vers1);
	return 0;
}


/* device_add_lock is needed to avoid double registration by cardmgr and kernel.
 * Serializes pcmcia_device_add; will most likely be removed in future.
 *
 * While it has the caveat that adding new PCMCIA devices inside(!) device_register()
 * won't work, this doesn't matter much at the moment: the driver core doesn't
 * support it either.
 */
static DEFINE_MUTEX(device_add_lock);

struct pcmcia_device * pcmcia_device_add(struct pcmcia_socket *s, unsigned int function)
{
	struct pcmcia_device *p_dev, *tmp_dev;
	unsigned long flags;
	int bus_id_len;

	s = pcmcia_get_socket(s);
	if (!s)
		return NULL;

	mutex_lock(&device_add_lock);

	ds_dbg(3, "adding device to %d, function %d\n", s->sock, function);

	/* max of 4 devices per card */
	if (s->device_count == 4)
		goto err_put;

	p_dev = kzalloc(sizeof(struct pcmcia_device), GFP_KERNEL);
	if (!p_dev)
		goto err_put;

	p_dev->socket = s;
	p_dev->device_no = (s->device_count++);
	p_dev->func   = function;

	p_dev->dev.bus = &pcmcia_bus_type;
	p_dev->dev.parent = s->dev.parent;
	p_dev->dev.release = pcmcia_release_dev;
	/* by default don't allow DMA */
	p_dev->dma_mask = DMA_MASK_NONE;
	p_dev->dev.dma_mask = &p_dev->dma_mask;
	bus_id_len = sprintf (p_dev->dev.bus_id, "%d.%d", p_dev->socket->sock, p_dev->device_no);

	p_dev->devname = kmalloc(6 + bus_id_len + 1, GFP_KERNEL);
	if (!p_dev->devname)
		goto err_free;
	sprintf (p_dev->devname, "pcmcia%s", p_dev->dev.bus_id);
	ds_dbg(3, "devname is %s\n", p_dev->devname);

	spin_lock_irqsave(&pcmcia_dev_list_lock, flags);

	/*
	 * p_dev->function_config must be the same for all card functions.
	 * Note that this is serialized by the device_add_lock, so that
	 * only one such struct will be created.
	 */
        list_for_each_entry(tmp_dev, &s->devices_list, socket_device_list)
                if (p_dev->func == tmp_dev->func) {
			p_dev->function_config = tmp_dev->function_config;
			kref_get(&p_dev->function_config->ref);
		}

	/* Add to the list in pcmcia_bus_socket */
	list_add(&p_dev->socket_device_list, &s->devices_list);

	spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);

	if (!p_dev->function_config) {
		ds_dbg(3, "creating config_t for %s\n", p_dev->dev.bus_id);
		p_dev->function_config = kzalloc(sizeof(struct config_t),
						 GFP_KERNEL);
		if (!p_dev->function_config)
			goto err_unreg;
		kref_init(&p_dev->function_config->ref);
	}

	printk(KERN_NOTICE "pcmcia: registering new device %s\n",
	       p_dev->devname);

	pcmcia_device_query(p_dev);

	if (device_register(&p_dev->dev))
		goto err_unreg;

	mutex_unlock(&device_add_lock);

	return p_dev;

 err_unreg:
	spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
	list_del(&p_dev->socket_device_list);
	spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);

 err_free:
	kfree(p_dev->devname);
	kfree(p_dev);
	s->device_count--;
 err_put:
	mutex_unlock(&device_add_lock);
	pcmcia_put_socket(s);

	return NULL;
}


static int pcmcia_card_add(struct pcmcia_socket *s)
{
	cisinfo_t cisinfo;
	cistpl_longlink_mfc_t mfc;
	unsigned int no_funcs, i;
	int ret = 0;

	if (!(s->resource_setup_done)) {
		ds_dbg(3, "no resources available, delaying card_add\n");
		return -EAGAIN; /* try again, but later... */
	}

	if (pcmcia_validate_mem(s)) {
		ds_dbg(3, "validating mem resources failed, "
		       "delaying card_add\n");
		return -EAGAIN; /* try again, but later... */
	}

	ret = pccard_validate_cis(s, BIND_FN_ALL, &cisinfo);
	if (ret || !cisinfo.Chains) {
		ds_dbg(0, "invalid CIS or invalid resources\n");
		return -ENODEV;
	}

	if (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_LONGLINK_MFC, &mfc))
		no_funcs = mfc.nfn;
	else
		no_funcs = 1;
	s->functions = no_funcs;

	for (i=0; i < no_funcs; i++)
		pcmcia_device_add(s, i);

	return (ret);
}


static void pcmcia_delayed_add_device(struct work_struct *work)
{
	struct pcmcia_socket *s =
		container_of(work, struct pcmcia_socket, device_add);
	ds_dbg(1, "adding additional device to %d\n", s->sock);
	pcmcia_device_add(s, s->pcmcia_state.mfc_pfc);
	s->pcmcia_state.device_add_pending = 0;
	s->pcmcia_state.mfc_pfc = 0;
}

static int pcmcia_requery(struct device *dev, void * _data)
{
	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
	if (!p_dev->dev.driver) {
		ds_dbg(1, "update device information for %s\n",
		       p_dev->dev.bus_id);
		pcmcia_device_query(p_dev);
	}

	return 0;
}

static void pcmcia_bus_rescan(struct pcmcia_socket *skt, int new_cis)
{
	int no_devices = 0;
	int ret = 0;
	unsigned long flags;

	/* must be called with skt_mutex held */
	ds_dbg(0, "re-scanning socket %d\n", skt->sock);

	spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
	if (list_empty(&skt->devices_list))
		no_devices = 1;
	spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);

	/* If this is because of a CIS override, start over */
	if (new_cis && !no_devices)
		pcmcia_card_remove(skt, NULL);

	/* if no devices were added for this socket yet because of
	 * missing resource information or other trouble, we need to
	 * do this now. */
	if (no_devices || new_cis) {
		ret = pcmcia_card_add(skt);
		if (ret)
			return;
	}

	/* some device information might have changed because of a CIS
	 * update or because we can finally read it correctly... so
	 * determine it again, overwriting old values if necessary. */
	bus_for_each_dev(&pcmcia_bus_type, NULL, NULL, pcmcia_requery);

	/* we re-scan all devices, not just the ones connected to this
	 * socket. This does not matter, though. */
	ret = bus_rescan_devices(&pcmcia_bus_type);
	if (ret)
		printk(KERN_INFO "pcmcia: bus_rescan_devices failed\n");
}

#ifdef CONFIG_PCMCIA_LOAD_CIS

/**
 * pcmcia_load_firmware - load CIS from userspace if device-provided is broken
 * @dev: the pcmcia device which needs a CIS override
 * @filename: requested filename in /lib/firmware/
 *
 * This uses the in-kernel firmware loading mechanism to use a "fake CIS" if
 * the one provided by the card is broken. The firmware files reside in
 * /lib/firmware/ in userspace.
 */
static int pcmcia_load_firmware(struct pcmcia_device *dev, char * filename)
{
	struct pcmcia_socket *s = dev->socket;
	const struct firmware *fw;
	char path[20];
	int ret = -ENOMEM;
	int no_funcs;
	int old_funcs;
	cisdump_t *cis;
	cistpl_longlink_mfc_t mfc;

	if (!filename)
		return -EINVAL;

	ds_dbg(1, "trying to load CIS file %s\n", filename);

	if (strlen(filename) > 14) {
		printk(KERN_WARNING "pcmcia: CIS filename is too long\n");
		return -EINVAL;
	}

	snprintf(path, 20, "%s", filename);

	if (request_firmware(&fw, path, &dev->dev) == 0) {
		if (fw->size >= CISTPL_MAX_CIS_SIZE) {
			ret = -EINVAL;
			printk(KERN_ERR "pcmcia: CIS override is too big\n");
			goto release;
		}

		cis = kzalloc(sizeof(cisdump_t), GFP_KERNEL);
		if (!cis) {
			ret = -ENOMEM;
			goto release;
		}

		cis->Length = fw->size + 1;
		memcpy(cis->Data, fw->data, fw->size);

		if (!pcmcia_replace_cis(s, cis))
			ret = 0;
		else {
			printk(KERN_ERR "pcmcia: CIS override failed\n");
			goto release;
		}


		/* update information */
		pcmcia_device_query(dev);

		/* does this cis override add or remove functions? */
		old_funcs = s->functions;

		if (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_LONGLINK_MFC, &mfc))
			no_funcs = mfc.nfn;
		else
			no_funcs = 1;
		s->functions = no_funcs;

		if (old_funcs > no_funcs)
			pcmcia_card_remove(s, dev);
		else if (no_funcs > old_funcs)
			pcmcia_add_device_later(s, 1);
	}
 release:
	release_firmware(fw);

	return (ret);
}

#else /* !CONFIG_PCMCIA_LOAD_CIS */

static inline int pcmcia_load_firmware(struct pcmcia_device *dev, char * filename)
{
	return -ENODEV;
}

#endif


static inline int pcmcia_devmatch(struct pcmcia_device *dev,
				  struct pcmcia_device_id *did)
{
	if (did->match_flags & PCMCIA_DEV_ID_MATCH_MANF_ID) {
		if ((!dev->has_manf_id) || (dev->manf_id != did->manf_id))
			return 0;
	}

	if (did->match_flags & PCMCIA_DEV_ID_MATCH_CARD_ID) {
		if ((!dev->has_card_id) || (dev->card_id != did->card_id))
			return 0;
	}

	if (did->match_flags & PCMCIA_DEV_ID_MATCH_FUNCTION) {
		if (dev->func != did->function)
			return 0;
	}

	if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID1) {
		if (!dev->prod_id[0])
			return 0;
		if (strcmp(did->prod_id[0], dev->prod_id[0]))
			return 0;
	}

	if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID2) {
		if (!dev->prod_id[1])
			return 0;
		if (strcmp(did->prod_id[1], dev->prod_id[1]))
			return 0;
	}

	if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID3) {
		if (!dev->prod_id[2])
			return 0;
		if (strcmp(did->prod_id[2], dev->prod_id[2]))
			return 0;
	}

	if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID4) {
		if (!dev->prod_id[3])
			return 0;
		if (strcmp(did->prod_id[3], dev->prod_id[3]))
			return 0;
	}

	if (did->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO) {
		if (dev->device_no != did->device_no)
			return 0;
	}

	if (did->match_flags & PCMCIA_DEV_ID_MATCH_FUNC_ID) {
		if ((!dev->has_func_id) || (dev->func_id != did->func_id))
			return 0;

		/* if this is a pseudo-multi-function device,
		 * we need explicit matches */
		if (did->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO)
			return 0;
		if (dev->device_no)
			return 0;

		/* also, FUNC_ID matching needs to be activated by userspace
		 * after it has re-checked that there is no possible module
		 * with a prod_id/manf_id/card_id match.
		 */
		ds_dbg(0, "skipping FUNC_ID match for %s until userspace "
		       "interaction\n", dev->dev.bus_id);
		if (!dev->allow_func_id_match)
			return 0;
	}

	if (did->match_flags & PCMCIA_DEV_ID_MATCH_FAKE_CIS) {
		ds_dbg(0, "device %s needs a fake CIS\n", dev->dev.bus_id);
		if (!dev->socket->fake_cis)
			pcmcia_load_firmware(dev, did->cisfile);

		if (!dev->socket->fake_cis)
			return 0;
	}

	if (did->match_flags & PCMCIA_DEV_ID_MATCH_ANONYMOUS) {
		int i;
		for (i=0; i<4; i++)
			if (dev->prod_id[i])
				return 0;
		if (dev->has_manf_id || dev->has_card_id || dev->has_func_id)
			return 0;
	}

	dev->dev.driver_data = (void *) did;

	return 1;
}


static int pcmcia_bus_match(struct device * dev, struct device_driver * drv) {
	struct pcmcia_device * p_dev = to_pcmcia_dev(dev);
	struct pcmcia_driver * p_drv = to_pcmcia_drv(drv);
	struct pcmcia_device_id *did = p_drv->id_table;
	struct pcmcia_dynid *dynid;

	/* match dynamic devices first */
	spin_lock(&p_drv->dynids.lock);
	list_for_each_entry(dynid, &p_drv->dynids.list, node) {
		ds_dbg(3, "trying to match %s to %s\n", dev->bus_id,
		       drv->name);
		if (pcmcia_devmatch(p_dev, &dynid->id)) {
			ds_dbg(0, "matched %s to %s\n", dev->bus_id,
			       drv->name);
			spin_unlock(&p_drv->dynids.lock);
			return 1;
		}
	}
	spin_unlock(&p_drv->dynids.lock);

#ifdef CONFIG_PCMCIA_IOCTL
	/* matching by cardmgr */
	if (p_dev->cardmgr == p_drv) {
		ds_dbg(0, "cardmgr matched %s to %s\n", dev->bus_id,
		       drv->name);
		return 1;
	}