patch-2.3.99-pre3 linux/drivers/isdn/avmb1/avm_cs.c

• Lines: 529
• Date: Thu Mar 23 08:38:57 2000
• Orig file: v2.3.99-pre2/linux/drivers/isdn/avmb1/avm_cs.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre2/linux/drivers/isdn/avmb1/avm_cs.c linux/drivers/isdn/avmb1/avm_cs.c
@@ -0,0 +1,528 @@
+/*======================================================================
+
+    A PCMCIA client driver for AVM B1/M1/M2
+
+    Written by Carsten Paeth, calle@calle.in-berlin.de
+    
+======================================================================*/
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/ptrace.h>
+#include <linux/malloc.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/tty.h>
+#include <linux/serial.h>
+#include <linux/major.h>
+#include <asm/io.h>
+#include <asm/system.h>
+
+#include <pcmcia/version.h>
+#include <pcmcia/cs_types.h>
+#include <pcmcia/cs.h>
+#include <pcmcia/cistpl.h>
+#include <pcmcia/ciscode.h>
+#include <pcmcia/ds.h>
+#include <pcmcia/cisreg.h>
+
+#include <linux/skbuff.h>
+#include <linux/capi.h>
+#include <linux/b1lli.h>
+#include <linux/b1pcmcia.h>
+
+/*====================================================================*/
+
+/* Parameters that can be set with 'insmod' */
+
+/* This means pick from 15, 12, 11, 10, 9, 7, 5, 4, and 3 */
+static int default_irq_list[10] = { 15, 12, 11, 10, 9, 7, 5, 4, 3, -1 };
+static int irq_list[10] = { -1 };
+
+MODULE_PARM(irq_list, "1-10i");
+
+/*====================================================================*/
+
+/*
+   The event() function is this driver's Card Services event handler.
+   It will be called by Card Services when an appropriate card status
+   event is received.  The config() and release() entry points are
+   used to configure or release a socket, in response to card insertion
+   and ejection events.  They are invoked from the skeleton event
+   handler.
+*/
+
+static void avmcs_config(dev_link_t *link);
+static void avmcs_release(u_long arg);
+static int avmcs_event(event_t event, int priority,
+			  event_callback_args_t *args);
+
+/*
+   The attach() and detach() entry points are used to create and destroy
+   "instances" of the driver, where each instance represents everything
+   needed to manage one actual PCMCIA card.
+*/
+
+static dev_link_t *avmcs_attach(void);
+static void avmcs_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 = "avm_cs";
+
+/*
+   A linked list of "instances" of the skeleton 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;
+
+/*
+   A dev_link_t structure has fields for most things that are needed
+   to keep track of a socket, but there will usually be some device
+   specific information that also needs to be kept track of.  The
+   'priv' pointer in a dev_link_t structure can be used to point to
+   a device-specific private data structure, like this.
+
+   A driver needs to provide a dev_node_t structure for each device
+   on a card.  In some cases, there is only one device per card (for
+   example, ethernet cards, modems).  In other cases, there may be
+   many actual or logical devices (SCSI adapters, memory cards with
+   multiple partitions).  The dev_node_t structures need to be kept
+   in a linked list starting at the 'dev' field of a dev_link_t
+   structure.  We allocate them in the card's private data structure,
+   because they generally can't be allocated dynamically.
+*/
+   
+typedef struct local_info_t {
+    dev_node_t	node;
+} local_info_t;
+
+/*====================================================================*/
+
+static void cs_error(client_handle_t handle, int func, int ret)
+{
+    error_info_t err = { func, ret };
+    CardServices(ReportError, handle, &err);
+}
+
+/*======================================================================
+
+    avmcs_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 *avmcs_attach(void)
+{
+    client_reg_t client_reg;
+    dev_link_t *link;
+    local_info_t *local;
+    int ret, i;
+    
+    /* Initialize the dev_link_t structure */
+    link = kmalloc(sizeof(struct dev_link_t), GFP_KERNEL);
+    memset(link, 0, sizeof(struct dev_link_t));
+    link->release.function = &avmcs_release;
+    link->release.data = (u_long)link;
+
+    /* The io structure describes IO port mapping */
+    link->io.NumPorts1 = 16;
+    link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
+    link->io.NumPorts2 = 16;
+    link->io.Attributes2 = IO_DATA_PATH_WIDTH_16;
+    link->io.IOAddrLines = 5;
+
+    /* Interrupt setup */
+    link->irq.Attributes = IRQ_TYPE_EXCLUSIVE;
+    link->irq.Attributes = IRQ_TYPE_DYNAMIC_SHARING|IRQ_FIRST_SHARED;
+
+    link->irq.IRQInfo1 = IRQ_INFO2_VALID|IRQ_LEVEL_ID;
+    if (irq_list[0] != -1) {
+	    for (i = 0; i < 10 && irq_list[i] > 0; i++)
+	       link->irq.IRQInfo2 |= 1 << irq_list[i];
+    } else {
+	    for (i = 0; i < 10 && default_irq_list[i] > 0; i++)
+	       link->irq.IRQInfo2 |= 1 << default_irq_list[i];
+    }
+    
+    /* General socket configuration */
+    link->conf.Attributes = CONF_ENABLE_IRQ;
+    link->conf.Vcc = 50;
+    link->conf.IntType = INT_MEMORY_AND_IO;
+    link->conf.ConfigIndex = 1;
+    link->conf.Present = PRESENT_OPTION;
+
+    /* Allocate space for private device-specific data */
+    local = kmalloc(sizeof(local_info_t), GFP_KERNEL);
+    memset(local, 0, sizeof(local_info_t));
+    link->priv = local;
+    
+    /* 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 = &avmcs_event;
+    client_reg.Version = 0x0210;
+    client_reg.event_callback_args.client_data = link;
+    ret = CardServices(RegisterClient, &link->handle, &client_reg);
+    if (ret != 0) {
+	cs_error(link->handle, RegisterClient, ret);
+	avmcs_detach(link);
+	return NULL;
+    }
+
+    return link;
+} /* avmcs_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 avmcs_detach(dev_link_t *link)
+{
+    dev_link_t **linkp;
+
+    /* Locate device structure */
+    for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next)
+	if (*linkp == link) break;
+    if (*linkp == NULL)
+	return;
+
+    /*
+       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) {
+	link->state |= DEV_STALE_LINK;
+	return;
+    }
+
+    /* Break the link with Card Services */
+    if (link->handle)
+	CardServices(DeregisterClient, link->handle);
+    
+    /* Unlink device structure, free pieces */
+    *linkp = link->next;
+    if (link->priv) {
+	kfree_s(link->priv, sizeof(local_info_t));
+    }
+    kfree_s(link, sizeof(struct dev_link_t));
+    
+} /* avmcs_detach */
+
+/*======================================================================
+
+    avmcs_config() is scheduled to run after a CARD_INSERTION event
+    is received, to configure the PCMCIA socket, and to make the
+    ethernet device available to the system.
+    
+======================================================================*/
+
+static int get_tuple(int fn, client_handle_t handle, tuple_t *tuple,
+		     cisparse_t *parse)
+{
+    int i;
+    i = CardServices(fn, handle, tuple);
+    if (i != CS_SUCCESS) return i;
+    i = CardServices(GetTupleData, handle, tuple);
+    if (i != CS_SUCCESS) return i;
+    return CardServices(ParseTuple, handle, tuple, parse);
+}
+
+#define first_tuple(a, b, c) get_tuple(GetFirstTuple, a, b, c)
+#define next_tuple(a, b, c) get_tuple(GetNextTuple, a, b, c)
+
+static void avmcs_config(dev_link_t *link)
+{
+    client_handle_t handle;
+    tuple_t tuple;
+    cisparse_t parse;
+    cistpl_cftable_entry_t *cf = &parse.cftable_entry;
+    local_info_t *dev;
+    int i;
+    u_char buf[64];
+    char devname[128];
+    int cardtype;
+    int (*addcard)(unsigned int port, unsigned irq);
+    
+    handle = link->handle;
+    dev = link->priv;
+
+    /*
+       This reads the card's CONFIG tuple to find its configuration
+       registers.
+    */
+    do {
+	tuple.DesiredTuple = CISTPL_CONFIG;
+	i = CardServices(GetFirstTuple, handle, &tuple);
+	if (i != CS_SUCCESS) break;
+	tuple.TupleData = buf;
+	tuple.TupleDataMax = 64;
+	tuple.TupleOffset = 0;
+	i = CardServices(GetTupleData, handle, &tuple);
+	if (i != CS_SUCCESS) break;
+	i = CardServices(ParseTuple, handle, &tuple, &parse);
+	if (i != CS_SUCCESS) break;
+	link->conf.ConfigBase = parse.config.base;
+    } while (0);
+    if (i != CS_SUCCESS) {
+	cs_error(link->handle, ParseTuple, i);
+	link->state &= ~DEV_CONFIG_PENDING;
+	return;
+    }
+    
+    /* Configure card */
+    link->state |= DEV_CONFIG;
+
+    do {
+
+	tuple.Attributes = 0;
+	tuple.TupleData = buf;
+	tuple.TupleDataMax = 254;
+	tuple.TupleOffset = 0;
+	tuple.DesiredTuple = CISTPL_VERS_1;
+
+	devname[0] = 0;
+	if( !first_tuple(handle, &tuple, &parse) && parse.version_1.ns > 1 ) {
+	    strncpy(devname,parse.version_1.str + parse.version_1.ofs[1], 
+			sizeof(devname));
+	}
+	/*
+         * find IO port
+         */
+	tuple.TupleData = (cisdata_t *)buf;
+	tuple.TupleOffset = 0; tuple.TupleDataMax = 255;
+	tuple.Attributes = 0;
+	tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
+	i = first_tuple(handle, &tuple, &parse);
+	while (i == CS_SUCCESS) {
+	    if (cf->io.nwin > 0) {
+		link->conf.ConfigIndex = cf->index;
+		link->io.BasePort1 = cf->io.win[0].base;
+		link->io.NumPorts1 = cf->io.win[0].len;
+                printk(KERN_INFO "avm_cs: testing i/o %#x-%#x\n",
+			link->io.BasePort1,
+		        link->io.BasePort1+link->io.NumPorts1);
+		i = CardServices(RequestIO, link->handle, &link->io);
+		if (i == CS_SUCCESS) goto found_port;
+	    }
+	    i = next_tuple(handle, &tuple, &parse);
+	}
+
+found_port:
+	if (i != CS_SUCCESS) {
+	    cs_error(link->handle, RequestIO, i);
+	    break;
+	}
+	
+	/*
+	 * allocate an interrupt line
+	 */
+	i = CardServices(RequestIRQ, link->handle, &link->irq);
+	if (i != CS_SUCCESS) {
+	    cs_error(link->handle, RequestIRQ, i);
+	    CardServices(ReleaseIO, link->handle, &link->io);
+	    break;
+	}
+	
+	/*
+         * configure the PCMCIA socket
+	  */
+	i = CardServices(RequestConfiguration, link->handle, &link->conf);
+	if (i != CS_SUCCESS) {
+	    cs_error(link->handle, RequestConfiguration, i);
+	    CardServices(ReleaseIO, link->handle, &link->io);
+	    CardServices(ReleaseIRQ, link->handle, &link->irq);
+	    break;
+	}
+
+    } while (0);
+
+    /* At this point, the dev_node_t structure(s) should be
+       initialized and arranged in a linked list at link->dev. */
+
+    if (devname[0]) {
+	char *s = strrchr(devname, ' ');
+	if (!s)
+	   s = devname;
+	else s++;
+	strcpy(dev->node.dev_name, s);
+        if (strcmp("M1", s) == 0) {
+           cardtype = AVM_CARDTYPE_M1;
+        } else if (strcmp("M2", s) == 0) {
+           cardtype = AVM_CARDTYPE_M2;
+	} else {
+           cardtype = AVM_CARDTYPE_B1;
+	}
+    } else {
+        strcpy(dev->node.dev_name, "b1");
+        cardtype = AVM_CARDTYPE_B1;
+    }
+
+    dev->node.major = 64;
+    dev->node.minor = 0;
+    link->dev = &dev->node;
+    
+    link->state &= ~DEV_CONFIG_PENDING;
+    /* If any step failed, release any partially configured state */
+    if (i != 0) {
+	avmcs_release((u_long)link);
+	return;
+    }
+
+
+    switch (cardtype) {
+        case AVM_CARDTYPE_M1: addcard = b1pcmcia_addcard_m1; break;
+        case AVM_CARDTYPE_M2: addcard = b1pcmcia_addcard_m2; break;
+	default:
+        case AVM_CARDTYPE_B1: addcard = b1pcmcia_addcard_b1; break;
+    }
+    if ((i = (*addcard)(link->io.BasePort1, link->irq.AssignedIRQ)) < 0) {
+        printk(KERN_ERR "avm_cs: failed to add AVM-%s-Controller at i/o %#x, irq %d\n",
+		dev->node.dev_name, link->io.BasePort1, link->irq.AssignedIRQ);
+	avmcs_release((u_long)link);
+	return;
+    }
+    dev->node.minor = i;
+
+} /* avmcs_config */
+
+/*======================================================================
+
+    After a card is removed, avmcs_release() will unregister the net
+    device, and release the PCMCIA configuration.  If the device is
+    still open, this will be postponed until it is closed.
+    
+======================================================================*/
+
+static void avmcs_release(u_long arg)
+{
+    dev_link_t *link = (dev_link_t *)arg;
+
+    /*
+       If the device is currently in use, we won't release until it
+       is actually closed.
+    */
+    if (link->open) {
+	link->state |= DEV_STALE_CONFIG;
+	return;
+    }
+
+    b1pcmcia_delcard(link->io.BasePort1, link->irq.AssignedIRQ);
+
+    /* Unlink the device chain */
+    link->dev = NULL;
+    
+    /* Don't bother checking to see if these succeed or not */
+    CardServices(ReleaseConfiguration, link->handle);
+    CardServices(ReleaseIO, link->handle, &link->io);
+    CardServices(ReleaseIRQ, link->handle, &link->irq);
+    link->state &= ~DEV_CONFIG;
+    
+    if (link->state & DEV_STALE_LINK)
+	avmcs_detach(link);
+    
+} /* avmcs_release */
+
+/*======================================================================
+
+    The card status event handler.  Mostly, this schedules other
+    stuff to run after an event is received.  A CARD_REMOVAL event
+    also sets some flags to discourage the net drivers from trying
+    to talk to the card any more.
+
+    When a CARD_REMOVAL event is received, we immediately set a flag
+    to block future accesses to this device.  All the functions that
+    actually access the device should check this flag to make sure
+    the card is still present.
+    
+======================================================================*/
+
+static int avmcs_event(event_t event, int priority,
+			  event_callback_args_t *args)
+{
+    dev_link_t *link = args->client_data;
+
+    switch (event) {
+    case CS_EVENT_CARD_REMOVAL:
+	link->state &= ~DEV_PRESENT;
+	if (link->state & DEV_CONFIG) {
+	    link->release.expires = jiffies + (HZ/20);
+	    add_timer(&link->release);
+	}
+	break;
+    case CS_EVENT_CARD_INSERTION:
+	link->state |= DEV_PRESENT | DEV_CONFIG_PENDING;
+	avmcs_config(link);
+	break;
+    case CS_EVENT_PM_SUSPEND:
+	link->state |= DEV_SUSPEND;
+	/* Fall through... */
+    case CS_EVENT_RESET_PHYSICAL:
+	if (link->state & DEV_CONFIG)
+	    CardServices(ReleaseConfiguration, link->handle);
+	break;
+    case CS_EVENT_PM_RESUME:
+	link->state &= ~DEV_SUSPEND;
+	/* Fall through... */
+    case CS_EVENT_CARD_RESET:
+	if (link->state & DEV_CONFIG)
+	    CardServices(RequestConfiguration, link->handle, &link->conf);
+	break;
+    }
+    return 0;
+} /* avmcs_event */
+
+/*====================================================================*/
+
+int init_module(void)
+{
+    servinfo_t serv;
+    CardServices(GetCardServicesInfo, &serv);
+    if (serv.Revision != CS_RELEASE_CODE) {
+	printk(KERN_NOTICE "avm_cs: Card Services release "
+	       "does not match!\n");
+	return -1;
+    }
+    register_pccard_driver(&dev_info, &avmcs_attach, &avmcs_detach);
+    return 0;
+}
+
+void cleanup_module(void)
+{
+    unregister_pccard_driver(&dev_info);
+    while (dev_list != NULL) {
+	if (dev_list->state & DEV_CONFIG)
+	    avmcs_release((u_long)dev_list);
+	avmcs_detach(dev_list);
+    }
+}