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authorThomas Pugliese <thomas.pugliese@gmail.com>2014-09-16 16:10:50 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-09-23 22:05:26 -0700
commitd08e1ad994afb70daf4ebf340f50425c1c5a2b75 (patch)
tree9dfc564046e2101ce868c3a5b62bf7740a349d1a /drivers/uwb
parent005799d560769bca8d87b08502c34317ab5e3bcd (diff)
uwb: add an ASIE sysfs attribute to uwb_rc devices
Allow user mode to add and remove application specific information elements (ASIEs) to the beacon of a uwb_rc device. Signed-off-by: Thomas Pugliese <thomas.pugliese@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/uwb')
-rw-r--r--drivers/uwb/lc-rc.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/drivers/uwb/lc-rc.c b/drivers/uwb/lc-rc.c
index 3eca6ceb9844..d059ad4d0dbd 100644
--- a/drivers/uwb/lc-rc.c
+++ b/drivers/uwb/lc-rc.c
@@ -119,10 +119,109 @@ struct uwb_rc *uwb_rc_alloc(void)
}
EXPORT_SYMBOL_GPL(uwb_rc_alloc);
+/*
+ * Show the ASIE that is broadcast in the UWB beacon by this uwb_rc device.
+ */
+static ssize_t ASIE_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;
+ struct uwb_ie_hdr *ie;
+ void *ptr;
+ size_t len;
+ int result = 0;
+
+ /* init empty buffer. */
+ result = scnprintf(buf, PAGE_SIZE, "\n");
+ mutex_lock(&rc->ies_mutex);
+ /* walk IEData looking for an ASIE. */
+ ptr = rc->ies->IEData;
+ len = le16_to_cpu(rc->ies->wIELength);
+ for (;;) {
+ ie = uwb_ie_next(&ptr, &len);
+ if (!ie)
+ break;
+ if (ie->element_id == UWB_APP_SPEC_IE) {
+ result = uwb_ie_dump_hex(ie,
+ ie->length + sizeof(struct uwb_ie_hdr),
+ buf, PAGE_SIZE);
+ break;
+ }
+ }
+ mutex_unlock(&rc->ies_mutex);
+
+ return result;
+}
+
+/*
+ * Update the ASIE that is broadcast in the UWB beacon by this uwb_rc device.
+ */
+static ssize_t ASIE_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;
+ char ie_buf[255];
+ int result, ie_len = 0;
+ const char *cur_ptr = buf;
+ struct uwb_ie_hdr *ie;
+
+ /* empty string means clear the ASIE. */
+ if (strlen(buf) <= 1) {
+ uwb_rc_ie_rm(rc, UWB_APP_SPEC_IE);
+ return size;
+ }
+
+ /* if non-empty string, convert string of hex chars to binary. */
+ while (ie_len < sizeof(ie_buf)) {
+ int char_count;
+
+ if (sscanf(cur_ptr, " %02hhX %n",
+ &(ie_buf[ie_len]), &char_count) > 0) {
+ ++ie_len;
+ /* skip chars read from cur_ptr. */
+ cur_ptr += char_count;
+ } else {
+ break;
+ }
+ }
+
+ /* validate IE length and type. */
+ if (ie_len < sizeof(struct uwb_ie_hdr)) {
+ dev_err(dev, "%s: Invalid ASIE size %d.\n", __func__, ie_len);
+ return -EINVAL;
+ }
+
+ ie = (struct uwb_ie_hdr *)ie_buf;
+ if (ie->element_id != UWB_APP_SPEC_IE) {
+ dev_err(dev, "%s: Invalid IE element type size = 0x%02X.\n",
+ __func__, ie->element_id);
+ return -EINVAL;
+ }
+
+ /* bounds check length field from user. */
+ if (ie->length > (ie_len - sizeof(struct uwb_ie_hdr)))
+ ie->length = ie_len - sizeof(struct uwb_ie_hdr);
+
+ /*
+ * Valid ASIE received. Remove current ASIE then add the new one using
+ * uwb_rc_ie_add.
+ */
+ uwb_rc_ie_rm(rc, UWB_APP_SPEC_IE);
+
+ result = uwb_rc_ie_add(rc, ie, ie->length + sizeof(struct uwb_ie_hdr));
+
+ return result >= 0 ? size : result;
+}
+static DEVICE_ATTR_RW(ASIE);
+
static struct attribute *rc_attrs[] = {
&dev_attr_mac_address.attr,
&dev_attr_scan.attr,
&dev_attr_beacon.attr,
+ &dev_attr_ASIE.attr,
NULL,
};

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