diff options
Diffstat (limited to 'drivers/staging/csr/io.c')
| -rw-r--r-- | drivers/staging/csr/io.c | 1166 |
1 files changed, 1166 insertions, 0 deletions
diff --git a/drivers/staging/csr/io.c b/drivers/staging/csr/io.c new file mode 100644 index 000000000000..e6503d9620a4 --- /dev/null +++ b/drivers/staging/csr/io.c @@ -0,0 +1,1166 @@ +/* + * --------------------------------------------------------------------------- + * 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. + */ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37) +DEFINE_SEMAPHORE(Unifi_instance_mutex); +#else +DECLARE_MUTEX(Unifi_instance_mutex); +#endif +/* + * 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; + func_enter(); + + 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; + } + func_exit(); + return -1; + } + } + func_exit(); + 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[interfaceTag]); + r = register_netdev(priv->netdev[interfaceTag]); + if (r) { + unifi_error(priv, "Failed to register net device\n"); + return -EINVAL; + } + + /* The device is registed */ + interfacePriv->netdev_registered = 1; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28) +#ifdef CONFIG_NET_SCHED + /* + * IMPORTANT: + * uf_install_qdisc() holds the network device lock, we can not + * install the qdisk before the network device is registered. + */ + r = uf_install_qdisc(priv->netdev[interfaceTag]); + if (r) { + unifi_error(priv, "Failed to install qdisc\n"); + return r; + } +#endif /* CONFIG_NET_SCHED */ +#endif /* LINUX_VERSION_CODE */ + +#ifdef CSR_SUPPORT_SME + /* + * Register the inet handler; it notifies us for changes in the IP address. + */ + uf_register_inet_notifier(); +#endif /* CSR_SUPPORT_SME */ + + unifi_notice(priv, "unifi%d is %s\n", + priv->instance, priv->netdev[interfaceTag]->name); + + return 0; +} /* uf_register_netdev */ + + +/* + * --------------------------------------------------------------------------- + * uf_unregister_netdev + * + * Unregisters the network interface and the inet handler. + * + * Arguments: + * priv Pointer to driver context. + * + * Returns: + * None. + * + * --------------------------------------------------------------------------- + */ +void +uf_unregister_netdev(unifi_priv_t *priv) +{ + int i=0; + +#ifdef CSR_SUPPORT_SME + /* Unregister the inet handler... */ + uf_unregister_inet_notifier(); +#endif /* CSR_SUPPORT_SME */ + + for (i=0; i<CSR_WIFI_NUM_INTERFACES; i++) { + netInterface_priv_t *interfacePriv = priv->interfacePriv[i]; + if (interfacePriv->netdev_registered) { + unifi_trace(priv, UDBG5, + "uf_unregister_netdev: netdev %d - 0x%p\n", + i, priv->netdev[i]); + + /* ... and the netdev */ + unregister_netdev(priv->netdev[i]); + interfacePriv->netdev_registered = 0; + } + + interfacePriv->interfaceMode = 0; + + /* Enable all queues by default */ + interfacePriv->queueEnabled[0] = 1; + interfacePriv->queueEnabled[1] = 1; + interfacePriv->queueEnabled[2] = 1; + interfacePriv->queueEnabled[3] = 1; + } + + priv->totalInterfaceCount = 0; +} /* uf_unregister_netdev() */ + + +/* + * --------------------------------------------------------------------------- + * register_unifi_sdio + * + * This function is called from the Probe (or equivalent) method of + * the SDIO driver when a UniFi card is detected. + * We allocate the Linux net_device struct, initialise the HIP core + * lib, create the char device nodes and start the userspace helper + * to initialise the device. + * + * Arguments: + * sdio_dev Pointer to SDIO context handle to use for all + * SDIO ops. + * bus_id A small number indicating the SDIO card position on the + * bus. Typically this is the slot number, e.g. 0, 1 etc. + * Valid values are 0 to MAX_UNIFI_DEVS-1. + * dev Pointer to kernel device manager struct. + * + * Returns: + * Pointer to the unifi instance, or NULL on error. + * --------------------------------------------------------------------------- + */ +static unifi_priv_t * +register_unifi_sdio(CsrSdioFunction *sdio_dev, int bus_id, struct device *dev) +{ + unifi_priv_t *priv = NULL; + int r = -1; + CsrResult csrResult; + + func_enter(); + + if ((bus_id < 0) || (bus_id >= MAX_UNIFI_DEVS)) { + unifi_error(priv, "register_unifi_sdio: invalid device %d\n", + bus_id); + return NULL; + } + + down(&Unifi_instance_mutex); + + if (In_use[bus_id] != UNIFI_DEV_NOT_IN_USE) { + unifi_error(priv, "register_unifi_sdio: device %d is already in use\n", + bus_id); + goto failed0; + } + + + /* Allocate device private and net_device structs */ + priv = uf_alloc_netdevice(sdio_dev, bus_id); + if (priv == NULL) { + unifi_error(priv, "Failed to allocate driver private\n"); + goto failed0; + } + + priv->unifi_device = dev; + + SET_NETDEV_DEV(priv->netdev[0], dev); + + /* We are not ready to send data yet. */ + netif_carrier_off(priv->netdev[0]); + + /* Allocate driver context. */ + priv->card = unifi_alloc_card(priv->sdio, priv); + if (priv->card == NULL) { + unifi_error(priv, "Failed to allocate UniFi driver card struct.\n"); + goto failed1; + } + + if (Unifi_instances[bus_id]) { + unifi_error(priv, "Internal error: instance for slot %d is already taken\n", + bus_id); + } + Unifi_instances[bus_id] = priv; + In_use[bus_id] = UNIFI_DEV_IN_USE; + + /* Save the netdev_priv for use by the netdev event callback mechanism */ + Unifi_netdev_instances[bus_id * CSR_WIFI_NUM_INTERFACES] = netdev_priv(priv->netdev[0]); + + /* Initialise the mini-coredump capture buffers */ + csrResult = unifi_coredump_init(priv->card, (u16)coredump_max); + if (csrResult != CSR_RESULT_SUCCESS) { + unifi_error(priv, "Couldn't allocate mini-coredump buffers\n"); + } + + /* Create the character device nodes */ + r = uf_create_device_nodes(priv, bus_id); + if (r) { + goto failed1; + } + + /* + * We use the slot number as unifi device index. + */ + snprintf(priv->proc_entry_name, 64, "driver/unifi%d", priv->instance); + /* + * The following complex casting is in place in order to eliminate 64-bit compilation warning + * "cast to/from pointer from/to integer of different size" + */ + if (!create_proc_read_entry(priv->proc_entry_name, 0, 0, + uf_read_proc, (void *)(long)priv->instance)) + { + unifi_error(priv, "unifi: can't create /proc/driver/unifi\n"); + } + + /* Allocate the net_device for interfaces other than 0. */ + { + int i; + priv->totalInterfaceCount =0; + + for(i=1;i<CSR_WIFI_NUM_INTERFACES;i++) + { + if( !uf_alloc_netdevice_for_other_interfaces(priv,i) ) + { + /* error occured while allocating the net_device for interface[i]. The net_device are + * allocated for the interfaces with id<i. Dont worry, all the allocated net_device will + * be releasing chen the control goes to the label failed0. + */ + unifi_error(priv, "Failed to allocate driver private for interface[%d]\n",i); + goto failed0; + } + else + { + SET_NETDEV_DEV(priv->netdev[i], dev); + + /* We are not ready to send data yet. */ + netif_carrier_off(priv->netdev[i]); + + /* Save the netdev_priv for use by the netdev event callback mechanism */ + Unifi_netdev_instances[bus_id * CSR_WIFI_NUM_INTERFACES + i] = netdev_priv(priv->netdev[i]); + } + } + + for(i=0;i<CSR_WIFI_NUM_INTERFACES;i++) + { + netInterface_priv_t *interfacePriv = priv->interfacePriv[i]; + interfacePriv->netdev_registered=0; + } + } + +#ifdef CSR_WIFI_RX_PATH_SPLIT + if (signal_buffer_init(priv, CSR_WIFI_RX_SIGNAL_BUFFER_SIZE)) + { + unifi_error(priv,"Failed to allocate shared memory for T-H signals\n"); + goto failed2; + } + priv->rx_workqueue = create_singlethread_workqueue("rx_workq"); + if (priv->rx_workqueue == NULL) { + unifi_error(priv,"create_singlethread_workqueue failed \n"); + goto failed3; + } + INIT_WORK(&priv->rx_work_struct, rx_wq_handler); +#endif + +#ifdef CSR_WIFI_HIP_DEBUG_OFFLINE + if (log_hip_signals) + { + uf_register_hip_offline_debug(priv); + } +#endif + + /* Initialise the SME related threads and parameters */ + r = uf_sme_init(priv); + if (r) { + unifi_error(priv, "SME initialisation failed.\n"); + goto failed4; + } + + /* + * Run the userspace helper program (unififw) to perform + * the device initialisation. + */ + unifi_trace(priv, UDBG1, "run UniFi helper app...\n"); + r = uf_run_unifihelper(priv); + if (r) { + unifi_notice(priv, "unable to run UniFi helper app\n"); + /* Not a fatal error. */ + } + + up(&Unifi_instance_mutex); + + func_exit(); + return priv; + +failed4: +#ifdef CSR_WIFI_HIP_DEBUG_OFFLINE +if (log_hip_signals) +{ + uf_unregister_hip_offline_debug(priv); +} +#endif +#ifdef CSR_WIFI_RX_PATH_SPLIT + flush_workqueue(priv->rx_workqueue); + destroy_workqueue(priv->rx_workqueue); +failed3: + signal_buffer_free(priv,CSR_WIFI_RX_SIGNAL_BUFFER_SIZE); +failed2: +#endif + /* Remove the device nodes */ + uf_destroy_device_nodes(priv); +failed1: + /* Deregister priv->netdev_client */ + ul_deregister_client(priv->netdev_client); + +failed0: + if (priv && priv->card) { + unifi_coredump_free(priv->card); + unifi_free_card(priv->card); + } + if (priv) { + uf_free_netdevice(priv); + } + + up(&Unifi_instance_mutex); + + func_exit(); + return NULL; +} /* register_unifi_sdio() */ + + +/* + * --------------------------------------------------------------------------- + * ask_unifi_sdio_cleanup + * + * We can not free our private context, until all the char device + * clients have closed the file handles. unregister_unifi_sdio() which + * is called when a card is removed, waits on Unifi_cleanup_wq until + * the reference count becomes zero. It is time to wake it up now. + * + * Arguments: + * priv Pointer to driver context. + * + * Returns: + * None. + * --------------------------------------------------------------------------- + */ +static void +ask_unifi_sdio_cleanup(unifi_priv_t *priv) +{ + func_enter(); + + /* + * Now clear the flag that says the old instance is in use. + * This is used to prevent a new instance being started before old + * one has finshed closing down, for example if bounce makes the card + * appear to be ejected and re-inserted quickly. + */ + In_use[priv->instance] = UNIFI_DEV_CLEANUP; + + unifi_trace(NULL, UDBG5, "ask_unifi_sdio_cleanup: wake up cleanup workqueue.\n"); + wake_up(&Unifi_cleanup_wq); + + func_exit(); + +} /* ask_unifi_sdio_cleanup() */ + + +/* + * --------------------------------------------------------------------------- + * cleanup_unifi_sdio + * + * Release any resources owned by a unifi instance. + * + * Arguments: + * priv Pointer to the instance to free. + * + * Returns: + * None. + * --------------------------------------------------------------------------- + */ +static void +cleanup_unifi_sdio(unifi_priv_t *priv) +{ + int priv_instance; + int i; + static const CsrWifiMacAddress broadcast_address = {{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}}; + + func_enter(); + + /* Remove the device nodes */ + uf_destroy_device_nodes(priv); + + /* Mark this device as gone away by NULLing the entry in Unifi_instances */ + Unifi_instances[priv->instance] = NULL; + + unifi_trace(priv, UDBG5, "cleanup_unifi_sdio: remove_proc_entry\n"); + /* + * Free the children of priv before unifi_free_netdevice() frees + * the priv struct + */ + remove_proc_entry(priv->proc_entry_name, 0); + + + /* Unregister netdev as a client. */ + if (priv->netdev_client) { + unifi_trace(priv, UDBG2, "Netdev client (id:%d s:0x%X) is unregistered\n", + priv->netdev_client->client_id, priv->netdev_client->sender_id); + ul_deregister_client(priv->netdev_client); + } + + /* Destroy the SME related threads and parameters */ + uf_sme_deinit(priv); + +#ifdef CSR_SME_USERSPACE + priv->smepriv = NULL; +#endif + +#ifdef CSR_WIFI_HIP_DEBUG_OFFLINE + if (log_hip_signals) + { + uf_unregister_hip_offline_debug(priv); + } +#endif + + /* Free any packets left in the Rx queues */ + for(i=0;i<CSR_WIFI_NUM_INTERFACES;i++) + { + uf_free_pending_rx_packets(priv, UF_UNCONTROLLED_PORT_Q, broadcast_address,i); + uf_free_pending_rx_packets(priv, UF_CONTROLLED_PORT_Q, broadcast_address,i); + } + /* + * We need to free the resources held by the core, which include tx skbs, + * otherwise we can not call unregister_netdev(). + */ + if (priv->card) { + unifi_trace(priv, UDBG5, "cleanup_unifi_sdio: free card\n"); + unifi_coredump_free(priv->card); + unifi_free_card(priv->card); + priv->card = NULL; + } + + /* + * Unregister the network device. + * We can not unregister the netdev before we release + * all pending packets in the core. + */ + uf_unregister_netdev(priv); + priv->totalInterfaceCount = 0; + + /* Clear the table of registered netdev_priv's */ + for (i = 0; i < CSR_WIFI_NUM_INTERFACES; i++) { + Unifi_netdev_instances[priv->instance * CSR_WIFI_NUM_INTERFACES + i] = NULL; + } + + unifi_trace(priv, UDBG5, "cleanup_unifi_sdio: uf_free_netdevice\n"); + /* + * When uf_free_netdevice() returns, the priv is invalid + * so we need to remember the instance to clear the global flag later. + */ + priv_instance = priv->instance; + +#ifdef CSR_WIFI_RX_PATH_SPLIT + flush_workqueue(priv->rx_workqueue); + destroy_workqueue(priv->rx_workqueue); + signal_buffer_free(priv,CSR_WIFI_RX_SIGNAL_BUFFER_SIZE); +#endif + + /* Priv is freed as part of the net_device */ + uf_free_netdevice(priv); + + /* + * Now clear the flag that says the old instance is in use. + * This is used to prevent a new instance being started before old + * one has finshed closing down, for example if bounce makes the card + * appear to be ejected and re-inserted quickly. + */ + In_use[priv_instance] = UNIFI_DEV_NOT_IN_USE; + + unifi_trace(NULL, UDBG5, "cleanup_unifi_sdio: DONE.\n"); + + func_exit(); + +} /* cleanup_unifi_sdio() */ + + +/* + * --------------------------------------------------------------------------- + * unregister_unifi_sdio + * + * Call from SDIO driver when it detects that UniFi has been removed. + * + * Arguments: + * bus_id Number of the card that was ejected. + * + * Returns: + * None. + * --------------------------------------------------------------------------- + */ +static void +unregister_unifi_sdio(int bus_id) +{ + unifi_priv_t *priv; + int interfaceTag=0; + u8 reason = CONFIG_IND_EXIT; + + if ((bus_id < 0) || (bus_id >= MAX_UNIFI_DEVS)) { + unifi_error(NULL, "unregister_unifi_sdio: invalid device %d\n", + bus_id); + return; + } + + priv = Unifi_instances[bus_id]; + if (priv == NULL) { + unifi_error(priv, "unregister_unifi_sdio: device %d is not registered\n", + bus_id); + func_exit(); + return; + } + + /* Stop the network traffic before freeing the core. */ + for(interfaceTag=0;interfaceTag<priv->totalInterfaceCount;interfaceTag++) + { + netInterface_priv_t *interfacePriv = priv->interfacePriv[interfaceTag]; + if(interfacePriv->netdev_registered) + { + netif_carrier_off(priv->netdev[interfaceTag]); + UF_NETIF_TX_STOP_ALL_QUEUES(priv->netdev[interfaceTag]); + } + } + +#ifdef CSR_NATIVE_LINUX + /* + * If the unifi thread was started, signal it to stop. This + * should cause any userspace processes with open unifi device to + * close them. + */ + uf_stop_thread(priv, &priv->bh_thread); + + /* Unregister the interrupt handler */ + if (csr_sdio_linux_remove_irq(priv->sdio)) { + unifi_notice(priv, + "csr_sdio_linux_remove_irq failed to talk to card.\n"); + } + + /* Ensure no MLME functions are waiting on a the mlme_event semaphore. */ + uf_abort_mlme(priv); +#endif /* CSR_NATIVE_LINUX */ + + ul_log_config_ind(priv, &reason, sizeof(u8)); + + /* Deregister the UDI hook from the core. */ + unifi_remove_udi_hook(priv->card, logging_handler); + + uf_put_instance(bus_id); + + /* + * Wait until the device is cleaned up. i.e., when all userspace + * processes have closed any open unifi devices. + */ + wait_event(Unifi_cleanup_wq, In_use[bus_id] == UNIFI_DEV_CLEANUP); + unifi_trace(NULL, UDBG5, "Received clean up event\n"); + + /* Now we can free the private context and the char device nodes */ + cleanup_unifi_sdio(priv); + +} /* unregister_unifi_sdio() */ + + +/* + * --------------------------------------------------------------------------- + * uf_find_instance + * + * Find the context structure for a given UniFi device instance. + * + * Arguments: + * inst The instance number to look for. + * + * Returns: + * None. + * --------------------------------------------------------------------------- + */ +unifi_priv_t * +uf_find_instance(int inst) +{ + if ((inst < 0) || (inst >= MAX_UNIFI_DEVS)) { + return NULL; + } + return Unifi_instances[inst]; +} /* uf_find_instance() */ + + +/* + * --------------------------------------------------------------------------- + * uf_find_priv + * + * Find the device instance for a given context structure. + * + * Arguments: + * priv The context structure pointer to look for. + * + * Returns: + * index of instance, -1 otherwise. + * --------------------------------------------------------------------------- + */ +int +uf_find_priv(unifi_priv_t *priv) +{ + int inst; + + if (!priv) { + return -1; + } + + for (inst = 0; inst < MAX_UNIFI_DEVS; inst++) { + if (Unifi_instances[inst] == priv) { + return inst; + } + } + + return -1; +} /* uf_find_priv() */ + +/* + * --------------------------------------------------------------------------- + * uf_find_netdev_priv + * + * Find the device instance for a given netdev context structure. + * + * Arguments: + * priv The context structure pointer to look for. + * + * Returns: + * index of instance, -1 otherwise. + * --------------------------------------------------------------------------- + */ +int +uf_find_netdev_priv(netInterface_priv_t *priv) +{ + int inst; + + if (!priv) { + return -1; + } + + for (inst = 0; inst < MAX_UNIFI_DEVS * CSR_WIFI_NUM_INTERFACES; inst++) { + if (Unifi_netdev_instances[inst] == priv) { + return inst; + } + } + + return -1; +} /* uf_find_netdev_priv() */ + +/* + * --------------------------------------------------------------------------- + * uf_get_instance + * + * Find the context structure for a given UniFi device instance + * and increment the reference count. + * + * Arguments: + * inst The instance number to look for. + * + * Returns: + * Pointer to the instance or NULL if no instance exists. + * --------------------------------------------------------------------------- + */ +unifi_priv_t * +uf_get_instance(int inst) +{ + unifi_priv_t *priv; + + down(&Unifi_instance_mutex); + + priv = uf_find_instance(inst); + if (priv) { + priv->ref_count++; + } + + up(&Unifi_instance_mutex); + + return priv; +} + +/* + * --------------------------------------------------------------------------- + * uf_put_instance + * + * Decrement the context reference count, freeing resources and + * shutting down the driver when the count reaches zero. + * + * Arguments: + * inst The instance number to look for. + * + * Returns: + * Pointer to the instance or NULL if no instance exists. + * --------------------------------------------------------------------------- + */ +void +uf_put_instance(int inst) +{ + unifi_priv_t *priv; + + down(&Unifi_instance_mutex); + + priv = uf_find_instance(inst); + if (priv) { + priv->ref_count--; + if (priv->ref_count == 0) { + ask_unifi_sdio_cleanup(priv); + } + } + + up(&Unifi_instance_mutex); +} + + +/* + * --------------------------------------------------------------------------- + * uf_read_proc + * + * Read method for driver node in /proc/driver/unifi0 + * + * Arguments: + * page + * start + * offset + * count + * eof + * data + * + * Returns: + * None. + * --------------------------------------------------------------------------- + */ +#ifdef CONFIG_PROC_FS +static int +uf_read_proc(char *page, char **start, off_t offset, int count, + int *eof, void *data) +{ +#define UNIFI_DEBUG_TXT_BUFFER 8*1024 + unifi_priv_t *priv; + int actual_amount_to_copy; + char *p, *orig_p; + s32 remain = UNIFI_DEBUG_TXT_BUFFER; + s32 written; + int i; + + /* + * The following complex casting is in place in order to eliminate 64-bit compilation warning + * "cast to/from pointer from/to integer of different size" + */ + priv = uf_find_instance((int)(long)data); + if (!priv) { + return 0; + } + + p = kmalloc( UNIFI_DEBUG_TXT_BUFFER, GFP_KERNEL ); + + orig_p = p; + + written = CsrSnprintf(p, remain, "UniFi SDIO Driver: %s %s %s\n", + CSR_WIFI_VERSION, __DATE__, __TIME__); + UNIFI_SNPRINTF_RET(p, remain, written); +#ifdef CSR_SME_USERSPACE + written = CsrSnprintf(p, remain, "SME: CSR userspace "); + UNIFI_SNPRINTF_RET(p, remain, written); +#ifdef CSR_SUPPORT_WEXT + written = CsrSnprintf(p, remain, "with WEXT support\n"); +#else + written = CsrSnprintf(p, remain, "\n"); +#endif /* CSR_SUPPORT_WEXT */ + UNIFI_SNPRINTF_RET(p, remain, written); +#endif /* CSR_SME_USERSPACE */ +#ifdef CSR_NATIVE_LINUX + written = CsrSnprintf(p, remain, "SME: native\n"); + UNIFI_SNPRINTF_RET(p, remain, written); +#endif + +#ifdef CSR_SUPPORT_SME + written = CsrSnprintf(p, remain, + "Firmware (ROM) build:%lu, Patch:%lu\n", + priv->card_info.fw_build, + priv->sme_versions.firmwarePatch); + UNIFI_SNPRINTF_RET(p, remain, written); +#endif + p += unifi_print_status(priv->card, p, &remain); + + written = CsrSnprintf(p, remain, "Last dbg str: %s\n", + priv->last_debug_string); + UNIFI_SNPRINTF_RET(p, remain, written); + + written = CsrSnprintf(p, remain, "Last dbg16:"); + UNIFI_SNPRINTF_RET(p, remain, written); + for (i = 0; i < 8; i++) { + written = CsrSnprintf(p, remain, " %04X", + priv->last_debug_word16[i]); + UNIFI_SNPRINTF_RET(p, remain, written); + } + written = CsrSnprintf(p, remain, "\n"); + UNIFI_SNPRINTF_RET(p, remain, written); + written = CsrSnprintf(p, remain, " "); + UNIFI_SNPRINTF_RET(p, remain, written); + for (; i < 16; i++) { + written = CsrSnprintf(p, remain, " %04X", + priv->last_debug_word16[i]); + UNIFI_SNPRINTF_RET(p, remain, written); + } + written = CsrSnprintf(p, remain, "\n"); + UNIFI_SNPRINTF_RET(p, remain, written); + *start = page; + + written = UNIFI_DEBUG_TXT_BUFFER - remain; + + if( offset >= written ) + { + *eof = 1; + kfree( orig_p ); + return(0); + } + + if( offset + count > written ) + { + actual_amount_to_copy = written - offset; + *eof = 1; + } + else + { + actual_amount_to_copy = count; + } + + memcpy( page, &(orig_p[offset]), actual_amount_to_copy ); + + kfree( orig_p ); + + return( actual_amount_to_copy ); +} /* uf_read_proc() */ +#endif + + + + +static void +uf_lx_suspend(CsrSdioFunction *sdio_ctx) +{ + unifi_priv_t *priv = sdio_ctx->driverData; + unifi_suspend(priv); + + CsrSdioSuspendAcknowledge(sdio_ctx, CSR_RESULT_SUCCESS); +} + +static void +uf_lx_resume(CsrSdioFunction *sdio_ctx) +{ + unifi_priv_t *priv = sdio_ctx->driverData; + unifi_resume(priv); + + CsrSdioResumeAcknowledge(sdio_ctx, CSR_RESULT_SUCCESS); +} + +static int active_slot = MAX_UNIFI_DEVS; +static struct device *os_devices[MAX_UNIFI_DEVS]; + +void +uf_add_os_device(int bus_id, struct device *os_device) +{ + if ((bus_id < 0) || (bus_id >= MAX_UNIFI_DEVS)) { + unifi_error(NULL, "uf_add_os_device: invalid device %d\n", + bus_id); + return; + } + + active_slot = bus_id; + os_devices[bus_id] = os_device; +} /* uf_add_os_device() */ + +void +uf_remove_os_device(int bus_id) +{ + if ((bus_id < 0) || (bus_id >= MAX_UNIFI_DEVS)) { + unifi_error(NULL, "uf_remove_os_device: invalid device %d\n", + bus_id); + return; + } + + active_slot = bus_id; + os_devices[bus_id] = NULL; +} /* uf_remove_os_device() */ + +static void +uf_sdio_inserted(CsrSdioFunction *sdio_ctx) +{ + unifi_priv_t *priv; + + unifi_trace(NULL, UDBG5, "uf_sdio_inserted(0x%p), slot_id=%d, dev=%p\n", + sdio_ctx, active_slot, os_devices[active_slot]); + + priv = register_unifi_sdio(sdio_ctx, active_slot, os_devices[active_slot]); + if (priv == NULL) { + CsrSdioInsertedAcknowledge(sdio_ctx, CSR_RESULT_FAILURE); + return; + } + + sdio_ctx->driverData = priv; + + CsrSdioInsertedAcknowledge(sdio_ctx, CSR_RESULT_SUCCESS); +} /* uf_sdio_inserted() */ + + +static void +uf_sdio_removed(CsrSdioFunction *sdio_ctx) +{ + unregister_unifi_sdio(active_slot); + CsrSdioRemovedAcknowledge(sdio_ctx); +} /* uf_sdio_removed() */ + + +static void +uf_sdio_dsr_handler(CsrSdioFunction *sdio_ctx) +{ + unifi_priv_t *priv = sdio_ctx->driverData; + + unifi_sdio_interrupt_handler(priv->card); +} /* uf_sdio_dsr_handler() */ + +/* + * --------------------------------------------------------------------------- + * uf_sdio_int_handler + * + * Interrupt callback function for SDIO interrupts. + * This is called in kernel context (i.e. not interrupt context). + * We retrieve the unifi context pointer and call the main UniFi + * interrupt handler. + * + * Arguments: + * fdev SDIO context pointer + * + * Returns: + * None. + * --------------------------------------------------------------------------- + */ +static CsrSdioInterruptDsrCallback +uf_sdio_int_handler(CsrSdioFunction *sdio_ctx) +{ + return uf_sdio_dsr_handler; +} /* uf_sdio_int_handler() */ + + + + +static CsrSdioFunctionId unifi_ids[] = +{ + { + .manfId = SDIO_MANF_ID_CSR, + .cardId = SDIO_CARD_ID_UNIFI_3, + .sdioFunction = SDIO_WLAN_FUNC_ID_UNIFI_3, + .sdioInterface = CSR_SDIO_ANY_SDIO_INTERFACE, + }, + { + .manfId = SDIO_MANF_ID_CSR, + .cardId = SDIO_CARD_ID_UNIFI_4, + .sdioFunction = SDIO_WLAN_FUNC_ID_UNIFI_4, + .sdioInterface = CSR_SDIO_ANY_SDIO_INTERFACE, + } +}; + + +/* + * Structure to register with the glue layer. + */ +static CsrSdioFunctionDriver unifi_sdioFunction_drv = +{ + .inserted = uf_sdio_inserted, + .removed = uf_sdio_removed, + .intr = uf_sdio_int_handler, + .suspend = uf_lx_suspend, + .resume = uf_lx_resume, + + .ids = unifi_ids, + .idsCount = sizeof(unifi_ids) / sizeof(unifi_ids[0]) +}; + + +/* + * --------------------------------------------------------------------------- + * uf_sdio_load + * uf_sdio_unload + * + * These functions are called from the main module load and unload + * functions. They perform the appropriate operations for the monolithic + * driver. + * + * Arguments: + * None. + * + * Returns: + * None. + * --------------------------------------------------------------------------- + */ +int __init +uf_sdio_load(void) +{ + CsrResult csrResult; + + csrResult = CsrSdioFunctionDriverRegister(&unifi_sdioFunction_drv); + if (csrResult != CSR_RESULT_SUCCESS) { + unifi_error(NULL, "Failed to register UniFi SDIO driver: csrResult=%d\n", csrResult); + return -EIO; + } + + return 0; +} /* uf_sdio_load() */ + + + +void __exit +uf_sdio_unload(void) +{ + CsrSdioFunctionDriverUnregister(&unifi_sdioFunction_drv); +} /* uf_sdio_unload() */ + |