orinoco_cs.c

自己根据lkd和情境分析

/* orinoco_cs.c 0.09b	- (formerly known as dldwd_cs.c)
 *
 * A driver for "Hermes" chipset based PCMCIA wireless adaptors, such
 * as the Lucent WavelanIEEE/Orinoco cards and their OEM (Cabletron/
 * EnteraSys RoamAbout 802.11, ELSA Airlancer, Melco Buffalo and others).
 * It should also be usable on various Prism II based cards such as the
 * Linksys, D-Link and Farallon Skyline. It should also work on Symbol
 * cards such as the 3Com AirConnect and Ericsson WLAN.
 * 
 * Copyright notice & release notes in file orinoco.c
 */

#include <linux/config.h>

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/ioport.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/system.h>
#include <linux/proc_fs.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/wireless.h>
#include <linux/list.h>

#include <pcmcia/version.h>
#include <pcmcia/cs_types.h>
#include <pcmcia/cs.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/cisreg.h>
#include <pcmcia/ds.h>
#include <pcmcia/bus_ops.h>

#include "hermes.h"
#include "orinoco.h"

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

static char version[] __initdata = "orinoco_cs.c 0.09b (David Gibson <[e-mail]> and others)";

MODULE_AUTHOR("David Gibson <[e-mail]>");
MODULE_DESCRIPTION("Driver for PCMCIA Lucent Orinoco, Prism II based and similar wireless cards");
#ifdef MODULE_LICENSE
MODULE_LICENSE("Dual MPL/GPL");
#endif

/* Parameters that can be set with 'insmod' */

/* The old way: bit map of interrupts to choose from */
/* This means pick from 15, 14, 12, 11, 10, 9, 7, 5, 4, and 3 */
static uint irq_mask = 0xdeb8;
/* Newer, simpler way of listing specific interrupts */
static int irq_list[4] = { -1 };
/* Do a Pcmcia soft reset (may help some cards) */
static int reset_cor = 0;
/* Some D-Link cards have buggy CIS. They do work at 5v properly, but
 * don't have any CIS entry for it. This workaround it... */
static int ignore_cis_vcc; /* = 0 */

MODULE_PARM(irq_mask, "i");
MODULE_PARM(irq_list, "1-4i");
MODULE_PARM(reset_cor, "i");
MODULE_PARM(ignore_cis_vcc, "i");

/* Pcmcia specific structure */
struct orinoco_pccard {
	dev_link_t link;
	dev_node_t node;

	/* Common structure (fully included), see orinoco.h */
	struct orinoco_private  priv;
};

/*
 * Function prototypes
 */

/* struct net_device methods */
static int orinoco_cs_open(struct net_device *dev);
static int orinoco_cs_stop(struct net_device *dev);

/* PCMCIA gumpf */
static void orinoco_cs_config(dev_link_t * link);
static void orinoco_cs_release(u_long arg);
static int orinoco_cs_event(event_t event, int priority,
		       event_callback_args_t * args);

static dev_link_t *orinoco_cs_attach(void);
static void orinoco_cs_detach(dev_link_t *);

/*
   The dev_info variable is the "key" that is used to match up this
   device driver with appropriate cards, through the card configuration
   database.
*/

static dev_info_t dev_info = "orinoco_cs";

/*
   A linked list of "instances" of the dummy device.  Each actual
   PCMCIA card corresponds to one device instance, and is described
   by one dev_link_t structure (defined in ds.h).

   You may not want to use a linked list for this -- for example, the
   memory card driver uses an array of dev_link_t pointers, where minor
   device numbers are used to derive the corresponding array index.
*/

static dev_link_t *dev_list; /* = NULL */

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

static void
cs_error(client_handle_t handle, int func, int ret)
{
	error_info_t err = { func, ret };
	CardServices(ReportError, handle, &err);
}

static int
orinoco_cs_open(struct net_device *dev)
{
	struct orinoco_private *priv = (struct orinoco_private *)dev->priv;
	struct orinoco_pccard* card = (struct orinoco_pccard *)priv->card;
	dev_link_t *link = &card->link;
	int err;
	
	TRACE_ENTER(priv->ndev.name);

	link->open++;
	netif_device_attach(dev);
	
	err = orinoco_reset(priv);
	if (err)
		orinoco_cs_stop(dev);
	else
		netif_start_queue(dev);

	TRACE_EXIT(priv->ndev.name);

	return err;
}

static int
orinoco_cs_stop(struct net_device *dev)
{
	struct orinoco_private *priv = (struct orinoco_private *)dev->priv;
	struct orinoco_pccard* card = (struct orinoco_pccard *)priv->card;
	dev_link_t *link = &card->link;

	TRACE_ENTER(priv->ndev.name);

	netif_stop_queue(dev);

	orinoco_shutdown(priv);
	
	link->open--;

	if (link->state & DEV_STALE_CONFIG)
		mod_timer(&link->release, jiffies + HZ/20);
	
	TRACE_EXIT(priv->ndev.name);
	
	return 0;
}

/*
 * Do a soft reset of the Pcmcia card using the Configuration Option Register
 * Can't do any harm, and actually may do some good on some cards...
 * In fact, this seem necessary for Spectrum cards...
 */
static int
orinoco_cs_cor_reset(struct orinoco_private *priv)
{
	struct orinoco_pccard* card = (struct orinoco_pccard *)priv->card;
	dev_link_t *link = &card->link;
	conf_reg_t reg;
	u_int default_cor; 

	TRACE_ENTER(priv->ndev.name);

	/* Doing it if hardware is gone is guaranteed crash */
	if(! (link->state & DEV_CONFIG) )
		return -ENODEV;

	/* Save original COR value */
	reg.Function = 0;
	reg.Action = CS_READ;
	reg.Offset = CISREG_COR;
	reg.Value = 0;
	CardServices(AccessConfigurationRegister, link->handle, &reg);
	default_cor = reg.Value;

	DEBUG(2, "orinoco : orinoco_cs_cor_reset() : cor=0x%X\n", default_cor);

	/* Soft-Reset card */
	reg.Action = CS_WRITE;
	reg.Offset = CISREG_COR;
	reg.Value = (default_cor | COR_SOFT_RESET);
	CardServices(AccessConfigurationRegister, link->handle, &reg);

	/* Wait until the card has acknowledged our reset */
	/* FIXME: mdelay() is deprecated -dgibson */
	mdelay(1);

	/* Restore original COR configuration index */
	reg.Value = (default_cor & ~COR_SOFT_RESET);
	CardServices(AccessConfigurationRegister, link->handle, &reg);

	/* Wait until the card has finished restarting */
	/* FIXME: mdelay() is deprecated -dgibson */
	mdelay(1);

	TRACE_EXIT(priv->ndev.name);

	return 0;
}

/* Remove zombie instances (card removed, detach pending) */
static void
flush_stale_links(void)
{
	dev_link_t *link, *next;
	TRACE_ENTER("orinoco");
	for (link = dev_list; link; link = next) {
		next = link->next;
		if (link->state & DEV_STALE_LINK)
			orinoco_cs_detach(link);
	}
	TRACE_EXIT("orinoco");
}

/*======================================================================
  orinoco_cs_attach() creates an "instance" of the driver, allocating
  local data structures for one device.  The device is registered
  with Card Services.
  
  The dev_link structure is initialized, but we don't actually
  configure the card at this point -- we wait until we receive a
  card insertion event.
  ======================================================================*/

static dev_link_t *
orinoco_cs_attach(void)
{
	struct orinoco_pccard *card;
	struct orinoco_private *priv;
	dev_link_t *link;
	struct net_device *ndev;
	client_reg_t client_reg;
	int ret, i;

	TRACE_ENTER("orinoco");
	/* A bit of cleanup */
	flush_stale_links();

	/* Allocate space for private device-specific data */
	card = kmalloc(sizeof(*card), GFP_KERNEL);
	if (! card) {
		link = NULL;
		goto out;
	}
	memset(card, 0, sizeof(*card));

	/* Link both structure together */
	priv = &(card->priv);
	priv->card = card;
	link = &card->link;
	ndev = &priv->ndev;
	link->priv = priv;

	/* Initialize the dev_link_t structure */
	link->release.function = &orinoco_cs_release;
	link->release.data = (u_long) link;

	/* Interrupt setup */
	link->irq.Attributes = IRQ_TYPE_EXCLUSIVE;
	link->irq.IRQInfo1 = IRQ_INFO2_VALID | IRQ_LEVEL_ID;
	if (irq_list[0] == -1)
		link->irq.IRQInfo2 = irq_mask;
	else
		for (i = 0; i < 4; i++)
			link->irq.IRQInfo2 |= 1 << irq_list[i];
	link->irq.Handler = NULL;

	/*
	   General socket configuration defaults can go here.  In this
	   client, we assume very little, and rely on the CIS for almost
	   everything.  In most clients, many details (i.e., number, sizes,
	   and attributes of IO windows) are fixed by the nature of the
	   device, and can be hard-wired here.
	 */
	link->conf.Attributes = 0;
	link->conf.IntType = INT_MEMORY_AND_IO;

	/* Setup the common part */
	if(orinoco_setup(priv) < 0) {
		kfree(card);
		return NULL;
	}

	/* Overrides */
	ndev->open = orinoco_cs_open;
	ndev->stop = orinoco_cs_stop;
	priv->card_reset_handler = orinoco_cs_cor_reset;

	/* Register with Card Services */
	link->next = dev_list;
	dev_list = link;
	client_reg.dev_info = &dev_info;
	client_reg.Attributes = INFO_IO_CLIENT | INFO_CARD_SHARE;
	client_reg.EventMask =
	    CS_EVENT_CARD_INSERTION | CS_EVENT_CARD_REMOVAL |
	    CS_EVENT_RESET_PHYSICAL | CS_EVENT_CARD_RESET |
	    CS_EVENT_PM_SUSPEND | CS_EVENT_PM_RESUME;
	client_reg.event_handler = &orinoco_cs_event;
	client_reg.Version = 0x0210;
	client_reg.event_callback_args.client_data = link;
	ret = CardServices(RegisterClient, &link->handle, &client_reg);
	if (ret != CS_SUCCESS) {
		cs_error(link->handle, RegisterClient, ret);
		orinoco_cs_detach(link);
		link = NULL;
		goto out;
	}

 out:
	TRACE_EXIT("orinoco");
	return link;
}				/* orinoco_cs_attach */

/*======================================================================
  This deletes a driver "instance".  The device is de-registered
  with Card Services.  If it has been released, all local data
  structures are freed.  Otherwise, the structures will be freed
  when the device is released.
  ======================================================================*/

static void
orinoco_cs_detach(dev_link_t * link)
{
	dev_link_t **linkp;
	struct orinoco_private *priv = link->priv;

	TRACE_ENTER("orinoco");

	/* Locate device structure */
	for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next)
		if (*linkp == link)
			break;
	if (*linkp == NULL)
		goto out;

	/*
	   If the device is currently configured and active, we won't
	   actually delete it yet.  Instead, it is marked so that when
	   the release() function is called, that will trigger a proper
	   detach().
	 */
	if (link->state & DEV_CONFIG) {
#ifdef PCMCIA_DEBUG
		printk(KERN_DEBUG "orinoco_cs: detach postponed, '%s' "
		       "still locked\n", link->dev->dev_name);
#endif
		link->state |= DEV_STALE_LINK;
		goto out;
	}

	/* Break the link with Card Services */
	if (link->handle)
		CardServices(DeregisterClient, link->handle);

	/* Unlink device structure, and free it */
	*linkp = link->next;
	DEBUG(0, "orinoco_cs: detach: link=%p link->dev=%p\n", link, link->dev);
	if (link->dev) {
		DEBUG(0, "orinoco_cs: About to unregister net device %p\n",
		      &priv->ndev);
		unregister_netdev(&priv->ndev);
	}
	kfree(priv->card);

 out:
	TRACE_EXIT("orinoco");
}				/* orinoco_cs_detach */

/*======================================================================
  orinoco_cs_config() is scheduled to run after a CARD_INSERTION event
  is received, to configure the PCMCIA socket, and to make the
  device available to the system.
  ======================================================================*/

#define CS_CHECK(fn, args...) \
while ((last_ret=CardServices(last_fn=(fn),args))!=0) goto cs_failed

#define CFG_CHECK(fn, args...) \
if (CardServices(fn, args) != 0) goto next_entry

static void
orinoco_cs_config(dev_link_t * link)
{
	client_handle_t handle = link->handle;
	struct orinoco_private *priv = link->priv;
	struct orinoco_pccard *card = (struct orinoco_pccard *)priv->card;
	hermes_t *hw = &priv->hw;