USB: Move wusbcore and UWB to staging as it is obsolete

[linux-2.6-microblaze.git] / drivers / staging / uwb / scan.c

diff --git a/drivers/staging/uwb/scan.c b/drivers/staging/uwb/scan.c
new file mode 100644 (file)
index 0000000..ffc3f45
--- /dev/null
+++ b/drivers/staging/uwb/scan.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Ultra Wide Band
+ * Scanning management
+ *
+ * Copyright (C) 2005-2006 Intel Corporation
+ * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
+ *
+ * FIXME: docs
+ * FIXME: there are issues here on how BEACON and SCAN on USB RCI deal
+ *        with each other. Currently seems that START_BEACON while
+ *        SCAN_ONLY will cancel the scan, so we need to update the
+ *        state here. Clarification request sent by email on
+ *        10/05/2005.
+ *        10/28/2005 No clear answer heard--maybe we'll hack the API
+ *                   so that when we start beaconing, if the HC is
+ *                   scanning in a mode not compatible with beaconing
+ *                   we just fail.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include "uwb-internal.h"
+
+
+/**
+ * Start/stop scanning in a radio controller
+ *
+ * @rc:      UWB Radio Controller
+ * @channel: Channel to scan; encodings in WUSB1.0[Table 5.12]
+ * @type:    Type of scanning to do.
+ * @bpst_offset: value at which to start scanning (if type ==
+ *                UWB_SCAN_ONLY_STARTTIME)
+ * @returns: 0 if ok, < 0 errno code on error
+ *
+ * We put the command on kmalloc'ed memory as some arches cannot do
+ * USB from the stack. The reply event is copied from an stage buffer,
+ * so it can be in the stack. See WUSB1.0[8.6.2.4] for more details.
+ */
+int uwb_rc_scan(struct uwb_rc *rc,
+               unsigned channel, enum uwb_scan_type type,
+               unsigned bpst_offset)
+{
+       int result;
+       struct uwb_rc_cmd_scan *cmd;
+       struct uwb_rc_evt_confirm reply;
+
+       result = -ENOMEM;
+       cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
+       if (cmd == NULL)
+               goto error_kzalloc;
+       mutex_lock(&rc->uwb_dev.mutex);
+       cmd->rccb.bCommandType = UWB_RC_CET_GENERAL;
+       cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_SCAN);
+       cmd->bChannelNumber = channel;
+       cmd->bScanState = type;
+       cmd->wStartTime = cpu_to_le16(bpst_offset);
+       reply.rceb.bEventType = UWB_RC_CET_GENERAL;
+       reply.rceb.wEvent = UWB_RC_CMD_SCAN;
+       result = uwb_rc_cmd(rc, "SCAN", &cmd->rccb, sizeof(*cmd),
+                           &reply.rceb, sizeof(reply));
+       if (result < 0)
+               goto error_cmd;
+       if (reply.bResultCode != UWB_RC_RES_SUCCESS) {
+               dev_err(&rc->uwb_dev.dev,
+                       "SCAN: command execution failed: %s (%d)\n",
+                       uwb_rc_strerror(reply.bResultCode), reply.bResultCode);
+               result = -EIO;
+               goto error_cmd;
+       }
+       rc->scanning = channel;
+       rc->scan_type = type;
+error_cmd:
+       mutex_unlock(&rc->uwb_dev.mutex);
+       kfree(cmd);
+error_kzalloc:
+       return result;
+}
+
+/*
+ * Print scanning state
+ */
+static ssize_t uwb_rc_scan_show(struct device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+       struct uwb_dev *uwb_dev = to_uwb_dev(dev);
+       struct uwb_rc *rc = uwb_dev->rc;
+       ssize_t result;
+
+       mutex_lock(&rc->uwb_dev.mutex);
+       result = sprintf(buf, "%d %d\n", rc->scanning, rc->scan_type);
+       mutex_unlock(&rc->uwb_dev.mutex);
+       return result;
+}
+
+/*
+ *
+ */
+static ssize_t uwb_rc_scan_store(struct device *dev,
+                                struct device_attribute *attr,
+                                const char *buf, size_t size)
+{
+       struct uwb_dev *uwb_dev = to_uwb_dev(dev);
+       struct uwb_rc *rc = uwb_dev->rc;
+       unsigned channel;
+       unsigned type;
+       unsigned bpst_offset = 0;
+       ssize_t result = -EINVAL;
+
+       result = sscanf(buf, "%u %u %u\n", &channel, &type, &bpst_offset);
+       if (result >= 2 && type < UWB_SCAN_TOP)
+               result = uwb_rc_scan(rc, channel, type, bpst_offset);
+
+       return result < 0 ? result : size;
+}
+
+/** Radio Control sysfs interface (declaration) */
+DEVICE_ATTR(scan, S_IRUGO | S_IWUSR, uwb_rc_scan_show, uwb_rc_scan_store);