path: root/drivers/staging/csr/io.c

/*
 * ---------------------------------------------------------------------------
 *  FILE:     io.c
 *
 *  PURPOSE:
 *      This file contains routines that the SDIO driver can call when a
 *      UniFi card is first inserted (or detected) and removed.
 *
 *      When used with sdioemb, the udev scripts (at least on Ubuntu) don't
 *      recognise a UniFi being added to the system. This is because sdioemb
 *      does not register itself as a device_driver, it uses it's own code
 *      to handle insert and remove.
 *      To have Ubuntu recognise UniFi, edit /etc/udev/rules.d/85-ifupdown.rules
 *      to change this line:
 *          SUBSYSTEM=="net", DRIVERS=="?*", GOTO="net_start"
 *      to these:
 *          #SUBSYSTEM=="net", DRIVERS=="?*", GOTO="net_start"
 *          SUBSYSTEM=="net", GOTO="net_start"
 *
 *      Then you can add a stanza to /etc/network/interfaces like this:
 *          auto eth1
 *          iface eth1 inet dhcp
 *          wpa-conf /etc/wpa_supplicant.conf
 *      This will then automatically associate when a car dis inserted.
 *
 * Copyright (C) 2006-2009 by Cambridge Silicon Radio Ltd.
 *
 * Refer to LICENSE.txt included with this source code for details on
 * the license terms.
 *
 * ---------------------------------------------------------------------------
 */
#include <linux/proc_fs.h>

#include "csr_wifi_hip_unifi.h"
#include "csr_wifi_hip_unifiversion.h"
#include "csr_wifi_hip_unifi_udi.h"   /* for unifi_print_status() */
#include "unifiio.h"
#include "unifi_priv.h"

/*
 * Array of pointers to context structs for unifi devices that are present.
 * The index in the array corresponds to the wlan interface number
 * (if "wlan*" is used). If "eth*" is used, the eth* numbers are allocated
 * after any Ethernet cards.
 *
 * The Arasan PCI-SDIO controller card supported by this driver has 2 slots,
 * hence a max of 2 devices.
 */
static unifi_priv_t *Unifi_instances[MAX_UNIFI_DEVS];

/* Array of pointers to netdev objects used by the UniFi driver, as there
 * are now many per instance. This is used to determine which netdev events
 * are for UniFi as opposed to other net interfaces.
 */
static netInterface_priv_t *Unifi_netdev_instances[MAX_UNIFI_DEVS * CSR_WIFI_NUM_INTERFACES];

/*
 * Array to hold the status of each unifi device in each slot.
 * We only process an insert event when In_use[] for the slot is
 * UNIFI_DEV_NOT_IN_USE. Otherwise, it means that the slot is in use or
 * we are in the middle of a cleanup (the action on unplug).
 */
#define UNIFI_DEV_NOT_IN_USE    0
#define UNIFI_DEV_IN_USE        1
#define UNIFI_DEV_CLEANUP       2
static int In_use[MAX_UNIFI_DEVS];
/*
 * Mutex to prevent UDI clients to open the character device before the priv
 * is created and initialised.
 */
DEFINE_SEMAPHORE(Unifi_instance_mutex);
/*
 * When the device is removed, unregister waits on Unifi_cleanup_wq
 * until all the UDI clients release the character device.
 */
DECLARE_WAIT_QUEUE_HEAD(Unifi_cleanup_wq);


static int uf_read_proc(char *page, char **start, off_t offset, int count,
                        int *eof, void *data);

#ifdef CSR_WIFI_RX_PATH_SPLIT

static CsrResult signal_buffer_init(unifi_priv_t * priv, int size)
{
    int i;

    priv->rxSignalBuffer.writePointer =
    priv->rxSignalBuffer.readPointer = 0;
    priv->rxSignalBuffer.size = size;
    /* Allocating Memory for Signal primitive pointer */
    for(i=0; i<size; i++)
    {
         priv->rxSignalBuffer.rx_buff[i].sig_len=0;
         priv->rxSignalBuffer.rx_buff[i].bufptr = kmalloc(UNIFI_PACKED_SIGBUF_SIZE, GFP_KERNEL);
         if (priv->rxSignalBuffer.rx_buff[i].bufptr == NULL)
         {
             int j;
             unifi_error(priv,"signal_buffer_init:Failed to Allocate shared memory for T-H signals \n");
             for(j=0;j<i;j++)
             {
                 priv->rxSignalBuffer.rx_buff[j].sig_len=0;
                 kfree(priv->rxSignalBuffer.rx_buff[j].bufptr);
                 priv->rxSignalBuffer.rx_buff[j].bufptr = NULL;
             }
             return -1;
         }
    }
    return 0;
}


static void signal_buffer_free(unifi_priv_t * priv, int size)
{
    int i;

    for(i=0; i<size; i++)
    {
         priv->rxSignalBuffer.rx_buff[i].sig_len=0;
         kfree(priv->rxSignalBuffer.rx_buff[i].bufptr);
         priv->rxSignalBuffer.rx_buff[i].bufptr = NULL;
    }
}
#endif
/*
 * ---------------------------------------------------------------------------
 *  uf_register_netdev
 *
 *      Registers the network interface, installes the qdisc,
 *      and registers the inet handler.
 *      In the porting exercise, register the driver to the network
 *      stack if necessary.
 *
 *  Arguments:
 *      priv          Pointer to driver context.
 *
 *  Returns:
 *      O on success, non-zero otherwise.
 *
 *  Notes:
 *      We will only unregister when the card is ejected, so we must
 *      only do it once.
 * ---------------------------------------------------------------------------
 */
int
uf_register_netdev(unifi_priv_t *priv, int interfaceTag)
{
    int r;
    netInterface_priv_t *interfacePriv = priv->interfacePriv[interfaceTag];

    if (interfaceTag >= CSR_WIFI_NUM_INTERFACES) {
        unifi_error(priv, "uf_register_netdev bad interfaceTag\n");
        return -EINVAL;
    }

    /*
     * Allocates a device number and registers device with the network
     * stack.
     */
    unifi_trace(priv, UDBG5, "uf_register_netdev: netdev %d - 0x%p\n",
            interfaceTag, priv->netdev[