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path: root/drivers/usb/storage/libusual.c
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Diffstat (limited to 'drivers/usb/storage/libusual.c')
-rw-r--r--drivers/usb/storage/libusual.c243
1 files changed, 0 insertions, 243 deletions
diff --git a/drivers/usb/storage/libusual.c b/drivers/usb/storage/libusual.c
deleted file mode 100644
index fe3ffe1459b..00000000000
--- a/drivers/usb/storage/libusual.c
+++ /dev/null
@@ -1,243 +0,0 @@
-/*
- * libusual
- *
- * The libusual contains the table of devices common for ub and usb-storage.
- */
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/usb.h>
-#include <linux/usb_usual.h>
-#include <linux/vmalloc.h>
-#include <linux/kthread.h>
-#include <linux/mutex.h>
-
-/*
- */
-#define USU_MOD_FL_THREAD 1 /* Thread is running */
-#define USU_MOD_FL_PRESENT 2 /* The module is loaded */
-
-struct mod_status {
- unsigned long fls;
-};
-
-static struct mod_status stat[3];
-static DEFINE_SPINLOCK(usu_lock);
-
-/*
- */
-#define USB_US_DEFAULT_BIAS USB_US_TYPE_STOR
-static atomic_t usu_bias = ATOMIC_INIT(USB_US_DEFAULT_BIAS);
-
-#define BIAS_NAME_SIZE (sizeof("usb-storage"))
-static const char *bias_names[3] = { "none", "usb-storage", "ub" };
-
-static DEFINE_MUTEX(usu_probe_mutex);
-static DECLARE_COMPLETION(usu_end_notify);
-static atomic_t total_threads = ATOMIC_INIT(0);
-
-static int usu_probe_thread(void *arg);
-
-/*
- * @type: the module type as an integer
- */
-void usb_usual_set_present(int type)
-{
- struct mod_status *st;
- unsigned long flags;
-
- if (type <= 0 || type >= 3)
- return;
- st = &stat[type];
- spin_lock_irqsave(&usu_lock, flags);
- st->fls |= USU_MOD_FL_PRESENT;
- spin_unlock_irqrestore(&usu_lock, flags);
-}
-EXPORT_SYMBOL_GPL(usb_usual_set_present);
-
-void usb_usual_clear_present(int type)
-{
- struct mod_status *st;
- unsigned long flags;
-
- if (type <= 0 || type >= 3)
- return;
- st = &stat[type];
- spin_lock_irqsave(&usu_lock, flags);
- st->fls &= ~USU_MOD_FL_PRESENT;
- spin_unlock_irqrestore(&usu_lock, flags);
-}
-EXPORT_SYMBOL_GPL(usb_usual_clear_present);
-
-/*
- * Match the calling driver type against the table.
- * Returns: 0 if the device matches.
- */
-int usb_usual_check_type(const struct usb_device_id *id, int caller_type)
-{
- int id_type = USB_US_TYPE(id->driver_info);
-
- if (caller_type <= 0 || caller_type >= 3)
- return -EINVAL;
-
- /* Drivers grab fixed assignment devices */
- if (id_type == caller_type)
- return 0;
- /* Drivers grab devices biased to them */
- if (id_type == USB_US_TYPE_NONE && caller_type == atomic_read(&usu_bias))
- return 0;
- return -ENODEV;
-}
-EXPORT_SYMBOL_GPL(usb_usual_check_type);
-
-/*
- */
-static int usu_probe(struct usb_interface *intf,
- const struct usb_device_id *id)
-{
- int rc;
- unsigned long type;
- struct task_struct* task;
- unsigned long flags;
-
- type = USB_US_TYPE(id->driver_info);
- if (type == 0)
- type = atomic_read(&usu_bias);
-
- spin_lock_irqsave(&usu_lock, flags);
- if ((stat[type].fls & (USU_MOD_FL_THREAD|USU_MOD_FL_PRESENT)) != 0) {
- spin_unlock_irqrestore(&usu_lock, flags);
- return -ENXIO;
- }
- stat[type].fls |= USU_MOD_FL_THREAD;
- spin_unlock_irqrestore(&usu_lock, flags);
-
- task = kthread_run(usu_probe_thread, (void*)type, "libusual_%ld", type);
- if (IS_ERR(task)) {
- rc = PTR_ERR(task);
- printk(KERN_WARNING "libusual: "
- "Unable to start the thread for %s: %d\n",
- bias_names[type], rc);
- spin_lock_irqsave(&usu_lock, flags);
- stat[type].fls &= ~USU_MOD_FL_THREAD;
- spin_unlock_irqrestore(&usu_lock, flags);
- return rc; /* Not being -ENXIO causes a message printed */
- }
- atomic_inc(&total_threads);
-
- return -ENXIO;
-}
-
-static void usu_disconnect(struct usb_interface *intf)
-{
- ; /* We should not be here. */
-}
-
-static struct usb_driver usu_driver = {
- .name = "libusual",
- .probe = usu_probe,
- .disconnect = usu_disconnect,
- .id_table = usb_storage_usb_ids,
-};
-
-/*
- * A whole new thread for a purpose of request_module seems quite stupid.
- * The request_module forks once inside again. However, if we attempt
- * to load a storage module from our own modprobe thread, that module
- * references our symbols, which cannot be resolved until our module is
- * initialized. I wish there was a way to wait for the end of initialization.
- * The module notifier reports MODULE_STATE_COMING only.
- * So, we wait until module->init ends as the next best thing.
- */
-static int usu_probe_thread(void *arg)
-{
- int type = (unsigned long) arg;
- struct mod_status *st = &stat[type];
- int rc;
- unsigned long flags;
-
- mutex_lock(&usu_probe_mutex);
- rc = request_module(bias_names[type]);
- spin_lock_irqsave(&usu_lock, flags);
- if (rc == 0 && (st->fls & USU_MOD_FL_PRESENT) == 0) {
- /*
- * This should not happen, but let us keep tabs on it.
- */
- printk(KERN_NOTICE "libusual: "
- "modprobe for %s succeeded, but module is not present\n",
- bias_names[type]);
- }
- st->fls &= ~USU_MOD_FL_THREAD;
- spin_unlock_irqrestore(&usu_lock, flags);
- mutex_unlock(&usu_probe_mutex);
-
- complete_and_exit(&usu_end_notify, 0);
-}
-
-/*
- */
-static int __init usb_usual_init(void)
-{
- int rc;
-
- mutex_lock(&usu_probe_mutex);
- rc = usb_register(&usu_driver);
- mutex_unlock(&usu_probe_mutex);
- return rc;
-}
-
-static void __exit usb_usual_exit(void)
-{
- /*
- * We do not check for any drivers present, because
- * they keep us pinned with symbol references.
- */
-
- usb_deregister(&usu_driver);
-
- while (atomic_read(&total_threads) > 0) {
- wait_for_completion(&usu_end_notify);
- atomic_dec(&total_threads);
- }
-}
-
-/*
- * Validate and accept the bias parameter.
- */
-static int usu_set_bias(const char *bias_s, struct kernel_param *kp)
-{
- int i;
- int len;
- int bias_n = 0;
-
- len = strlen(bias_s);
- if (len == 0)
- return -EDOM;
- if (bias_s[len-1] == '\n')
- --len;
-
- for (i = 1; i < 3; i++) {
- if (strncmp(bias_s, bias_names[i], len) == 0) {
- bias_n = i;
- break;
- }
- }
- if (bias_n == 0)
- return -EINVAL;
-
- atomic_set(&usu_bias, bias_n);
- return 0;
-}
-
-static int usu_get_bias(char *buffer, struct kernel_param *kp)
-{
- return strlen(strcpy(buffer, bias_names[atomic_read(&usu_bias)]));
-}
-
-module_init(usb_usual_init);
-module_exit(usb_usual_exit);
-
-module_param_call(bias, usu_set_bias, usu_get_bias, NULL, S_IRUGO|S_IWUSR);
-__MODULE_PARM_TYPE(bias, "string");
-MODULE_PARM_DESC(bias, "Bias to usb-storage or ub");
-
-MODULE_LICENSE("GPL");