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path: root/drivers/net/wireless/brcm80211/brcmutil/utils.c
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Diffstat (limited to 'drivers/net/wireless/brcm80211/brcmutil/utils.c')
-rw-r--r--drivers/net/wireless/brcm80211/brcmutil/utils.c600
1 files changed, 600 insertions, 0 deletions
diff --git a/drivers/net/wireless/brcm80211/brcmutil/utils.c b/drivers/net/wireless/brcm80211/brcmutil/utils.c
new file mode 100644
index 000000000000..62bcc71eadf6
--- /dev/null
+++ b/drivers/net/wireless/brcm80211/brcmutil/utils.c
@@ -0,0 +1,600 @@
+/*
+ * Copyright (c) 2010 Broadcom Corporation
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/netdevice.h>
+#include <brcmu_utils.h>
+
+MODULE_AUTHOR("Broadcom Corporation");
+MODULE_DESCRIPTION("Broadcom 802.11n wireless LAN driver utilities.");
+MODULE_SUPPORTED_DEVICE("Broadcom 802.11n WLAN cards");
+MODULE_LICENSE("Dual BSD/GPL");
+
+struct sk_buff *brcmu_pkt_buf_get_skb(uint len)
+{
+ struct sk_buff *skb;
+
+ skb = dev_alloc_skb(len);
+ if (skb) {
+ skb_put(skb, len);
+ skb->priority = 0;
+ }
+
+ return skb;
+}
+EXPORT_SYMBOL(brcmu_pkt_buf_get_skb);
+
+/* Free the driver packet. Free the tag if present */
+void brcmu_pkt_buf_free_skb(struct sk_buff *skb)
+{
+ struct sk_buff *nskb;
+ int nest = 0;
+
+ /* perversion: we use skb->next to chain multi-skb packets */
+ while (skb) {
+ nskb = skb->next;
+ skb->next = NULL;
+
+ if (skb->destructor)
+ /* cannot kfree_skb() on hard IRQ (net/core/skbuff.c) if
+ * destructor exists
+ */
+ dev_kfree_skb_any(skb);
+ else
+ /* can free immediately (even in_irq()) if destructor
+ * does not exist
+ */
+ dev_kfree_skb(skb);
+
+ nest++;
+ skb = nskb;
+ }
+}
+EXPORT_SYMBOL(brcmu_pkt_buf_free_skb);
+
+
+/* copy a buffer into a pkt buffer chain */
+uint brcmu_pktfrombuf(struct sk_buff *p, uint offset, int len,
+ unsigned char *buf)
+{
+ uint n, ret = 0;
+
+ /* skip 'offset' bytes */
+ for (; p && offset; p = p->next) {
+ if (offset < (uint) (p->len))
+ break;
+ offset -= p->len;
+ }
+
+ if (!p)
+ return 0;
+
+ /* copy the data */
+ for (; p && len; p = p->next) {
+ n = min((uint) (p->len) - offset, (uint) len);
+ memcpy(p->data + offset, buf, n);
+ buf += n;
+ len -= n;
+ ret += n;
+ offset = 0;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(brcmu_pktfrombuf);
+
+/* return total length of buffer chain */
+uint brcmu_pkttotlen(struct sk_buff *p)
+{
+ uint total;
+
+ total = 0;
+ for (; p; p = p->next)
+ total += p->len;
+ return total;
+}
+EXPORT_SYMBOL(brcmu_pkttotlen);
+
+/*
+ * osl multiple-precedence packet queue
+ * hi_prec is always >= the number of the highest non-empty precedence
+ */
+struct sk_buff *brcmu_pktq_penq(struct pktq *pq, int prec,
+ struct sk_buff *p)
+{
+ struct pktq_prec *q;
+
+ if (pktq_full(pq) || pktq_pfull(pq, prec))
+ return NULL;
+
+ q = &pq->q[prec];
+
+ if (q->head)
+ q->tail->prev = p;
+ else
+ q->head = p;
+
+ q->tail = p;
+ q->len++;
+
+ pq->len++;
+
+ if (pq->hi_prec < prec)
+ pq->hi_prec = (u8) prec;
+
+ return p;
+}
+EXPORT_SYMBOL(brcmu_pktq_penq);
+
+struct sk_buff *brcmu_pktq_penq_head(struct pktq *pq, int prec,
+ struct sk_buff *p)
+{
+ struct pktq_prec *q;
+
+ if (pktq_full(pq) || pktq_pfull(pq, prec))
+ return NULL;
+
+ q = &pq->q[prec];
+
+ if (q->head == NULL)
+ q->tail = p;
+
+ p->prev = q->head;
+ q->head = p;
+ q->len++;
+
+ pq->len++;
+
+ if (pq->hi_prec < prec)
+ pq->hi_prec = (u8) prec;
+
+ return p;
+}
+EXPORT_SYMBOL(brcmu_pktq_penq_head);
+
+struct sk_buff *brcmu_pktq_pdeq(struct pktq *pq, int prec)
+{
+ struct pktq_prec *q;
+ struct sk_buff *p;
+
+ q = &pq->q[prec];
+
+ p = q->head;
+ if (p == NULL)
+ return NULL;
+
+ q->head = p->prev;
+ if (q->head == NULL)
+ q->tail = NULL;
+
+ q->len--;
+
+ pq->len--;
+
+ p->prev = NULL;
+
+ return p;
+}
+EXPORT_SYMBOL(brcmu_pktq_pdeq);
+
+struct sk_buff *brcmu_pktq_pdeq_tail(struct pktq *pq, int prec)
+{
+ struct pktq_prec *q;
+ struct sk_buff *p, *prev;
+
+ q = &pq->q[prec];
+
+ p = q->head;
+ if (p == NULL)
+ return NULL;
+
+ for (prev = NULL; p != q->tail; p = p->prev)
+ prev = p;
+
+ if (prev)
+ prev->prev = NULL;
+ else
+ q->head = NULL;
+
+ q->tail = prev;
+ q->len--;
+
+ pq->len--;
+
+ return p;
+}
+EXPORT_SYMBOL(brcmu_pktq_pdeq_tail);
+
+void
+brcmu_pktq_pflush(struct pktq *pq, int prec, bool dir,
+ bool (*fn)(struct sk_buff *, void *), void *arg)
+{
+ struct pktq_prec *q;
+ struct sk_buff *p, *prev = NULL;
+
+ q = &pq->q[prec];
+ p = q->head;
+ while (p) {
+ if (fn == NULL || (*fn) (p, arg)) {
+ bool head = (p == q->head);
+ if (head)
+ q->head = p->prev;
+ else
+ prev->prev = p->prev;
+ p->prev = NULL;
+ brcmu_pkt_buf_free_skb(p);
+ q->len--;
+ pq->len--;
+ p = (head ? q->head : prev->prev);
+ } else {
+ prev = p;
+ p = p->prev;
+ }
+ }
+
+ if (q->head == NULL)
+ q->tail = NULL;
+}
+EXPORT_SYMBOL(brcmu_pktq_pflush);
+
+void brcmu_pktq_flush(struct pktq *pq, bool dir,
+ bool (*fn)(struct sk_buff *, void *), void *arg)
+{
+ int prec;
+ for (prec = 0; prec < pq->num_prec; prec++)
+ brcmu_pktq_pflush(pq, prec, dir, fn, arg);
+}
+EXPORT_SYMBOL(brcmu_pktq_flush);
+
+void brcmu_pktq_init(struct pktq *pq, int num_prec, int max_len)
+{
+ int prec;
+
+ /* pq is variable size; only zero out what's requested */
+ memset(pq, 0,
+ offsetof(struct pktq, q) + (sizeof(struct pktq_prec) * num_prec));
+
+ pq->num_prec = (u16) num_prec;
+
+ pq->max = (u16) max_len;
+
+ for (prec = 0; prec < num_prec; prec++)
+ pq->q[prec].max = pq->max;
+}
+EXPORT_SYMBOL(brcmu_pktq_init);
+
+struct sk_buff *brcmu_pktq_peek_tail(struct pktq *pq, int *prec_out)
+{
+ int prec;
+
+ if (pq->len == 0)
+ return NULL;
+
+ for (prec = 0; prec < pq->hi_prec; prec++)
+ if (pq->q[prec].head)
+ break;
+
+ if (prec_out)
+ *prec_out = prec;
+
+ return pq->q[prec].tail;
+}
+EXPORT_SYMBOL(brcmu_pktq_peek_tail);
+
+/* Return sum of lengths of a specific set of precedences */
+int brcmu_pktq_mlen(struct pktq *pq, uint prec_bmp)
+{
+ int prec, len;
+
+ len = 0;
+
+ for (prec = 0; prec <= pq->hi_prec; prec++)
+ if (prec_bmp & (1 << prec))
+ len += pq->q[prec].len;
+
+ return len;
+}
+EXPORT_SYMBOL(brcmu_pktq_mlen);
+
+/* Priority dequeue from a specific set of precedences */
+struct sk_buff *brcmu_pktq_mdeq(struct pktq *pq, uint prec_bmp,
+ int *prec_out)
+{
+ struct pktq_prec *q;
+ struct sk_buff *p;
+ int prec;
+
+ if (pq->len == 0)
+ return NULL;
+
+ while ((prec = pq->hi_prec) > 0 && pq->q[prec].head == NULL)
+ pq->hi_prec--;
+
+ while ((prec_bmp & (1 << prec)) == 0 || pq->q[prec].head == NULL)
+ if (prec-- == 0)
+ return NULL;
+
+ q = &pq->q[prec];
+
+ p = q->head;
+ if (p == NULL)
+ return NULL;
+
+ q->head = p->prev;
+ if (q->head == NULL)
+ q->tail = NULL;
+
+ q->len--;
+
+ if (prec_out)
+ *prec_out = prec;
+
+ pq->len--;
+
+ p->prev = NULL;
+
+ return p;
+}
+EXPORT_SYMBOL(brcmu_pktq_mdeq);
+
+#if defined(BCMDBG)
+/* pretty hex print a pkt buffer chain */
+void brcmu_prpkt(const char *msg, struct sk_buff *p0)
+{
+ struct sk_buff *p;
+
+ if (msg && (msg[0] != '\0'))
+ printk(KERN_DEBUG "%s:\n", msg);
+
+ for (p = p0; p; p = p->next)
+ print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, p->data, p->len);
+}
+EXPORT_SYMBOL(brcmu_prpkt);
+#endif /* defined(BCMDBG) */
+
+/*
+ * Traverse a string of 1-byte tag/1-byte length/variable-length value
+ * triples, returning a pointer to the substring whose first element
+ * matches tag
+ */
+struct brcmu_tlv *brcmu_parse_tlvs(void *buf, int buflen, uint key)
+{
+ struct brcmu_tlv *elt;
+ int totlen;
+
+ elt = (struct brcmu_tlv *) buf;
+ totlen = buflen;
+
+ /* find tagged parameter */
+ while (totlen >= 2) {
+ int len = elt->len;
+
+ /* validate remaining totlen */
+ if ((elt->id == key) && (totlen >= (len + 2)))
+ return elt;
+
+ elt = (struct brcmu_tlv *) ((u8 *) elt + (len + 2));
+ totlen -= (len + 2);
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL(brcmu_parse_tlvs);
+
+
+#if defined(BCMDBG)
+int
+brcmu_format_flags(const struct brcmu_bit_desc *bd, u32 flags, char *buf,
+ int len)
+{
+ int i;
+ char *p = buf;
+ char hexstr[16];
+ int slen = 0, nlen = 0;
+ u32 bit;
+ const char *name;
+
+ if (len < 2 || !buf)
+ return 0;
+
+ buf[0] = '\0';
+
+ for (i = 0; flags != 0; i++) {
+ bit = bd[i].bit;
+ name = bd[i].name;
+ if (bit == 0 && flags != 0) {
+ /* print any unnamed bits */
+ snprintf(hexstr, 16, "0x%X", flags);
+ name = hexstr;
+ flags = 0; /* exit loop */
+ } else if ((flags & bit) == 0)
+ continue;
+ flags &= ~bit;
+ nlen = strlen(name);
+ slen += nlen;
+ /* count btwn flag space */
+ if (flags != 0)
+ slen += 1;
+ /* need NULL char as well */
+ if (len <= slen)
+ break;
+ /* copy NULL char but don't count it */
+ strncpy(p, name, nlen + 1);
+ p += nlen;
+ /* copy btwn flag space and NULL char */
+ if (flags != 0)
+ p += snprintf(p, 2, " ");
+ len -= slen;
+ }
+
+ /* indicate the str was too short */
+ if (flags != 0) {
+ if (len < 2)
+ p -= 2 - len; /* overwrite last char */
+ p += snprintf(p, 2, ">");
+ }
+
+ return (int)(p - buf);
+}
+EXPORT_SYMBOL(brcmu_format_flags);
+
+/*
+ * print bytes formatted as hex to a string. return the resulting
+ * string length
+ */
+int brcmu_format_hex(char *str, const void *bytes, int len)
+{
+ int i;
+ char *p = str;
+ const u8 *src = (const u8 *)bytes;
+
+ for (i = 0; i < len; i++) {
+ p += snprintf(p, 3, "%02X", *src);
+ src++;
+ }
+ return (int)(p - str);
+}
+EXPORT_SYMBOL(brcmu_format_hex);
+#endif /* defined(BCMDBG) */
+
+char *brcmu_chipname(uint chipid, char *buf, uint len)
+{
+ const char *fmt;
+
+ fmt = ((chipid > 0xa000) || (chipid < 0x4000)) ? "%d" : "%x";
+ snprintf(buf, len, fmt, chipid);
+ return buf;
+}
+EXPORT_SYMBOL(brcmu_chipname);
+
+uint brcmu_mkiovar(char *name, char *data, uint datalen, char *buf, uint buflen)
+{
+ uint len;
+
+ len = strlen(name) + 1;
+
+ if ((len + datalen) > buflen)
+ return 0;
+
+ strncpy(buf, name, buflen);
+
+ /* append data onto the end of the name string */
+ memcpy(&buf[len], data, datalen);
+ len += datalen;
+
+ return len;
+}
+EXPORT_SYMBOL(brcmu_mkiovar);
+
+/* Quarter dBm units to mW
+ * Table starts at QDBM_OFFSET, so the first entry is mW for qdBm=153
+ * Table is offset so the last entry is largest mW value that fits in
+ * a u16.
+ */
+
+#define QDBM_OFFSET 153 /* Offset for first entry */
+#define QDBM_TABLE_LEN 40 /* Table size */
+
+/* Smallest mW value that will round up to the first table entry, QDBM_OFFSET.
+ * Value is ( mW(QDBM_OFFSET - 1) + mW(QDBM_OFFSET) ) / 2
+ */
+#define QDBM_TABLE_LOW_BOUND 6493 /* Low bound */
+
+/* Largest mW value that will round down to the last table entry,
+ * QDBM_OFFSET + QDBM_TABLE_LEN-1.
+ * Value is ( mW(QDBM_OFFSET + QDBM_TABLE_LEN - 1) +
+ * mW(QDBM_OFFSET + QDBM_TABLE_LEN) ) / 2.
+ */
+#define QDBM_TABLE_HIGH_BOUND 64938 /* High bound */
+
+static const u16 nqdBm_to_mW_map[QDBM_TABLE_LEN] = {
+/* qdBm: +0 +1 +2 +3 +4 +5 +6 +7 */
+/* 153: */ 6683, 7079, 7499, 7943, 8414, 8913, 9441, 10000,
+/* 161: */ 10593, 11220, 11885, 12589, 13335, 14125, 14962, 15849,
+/* 169: */ 16788, 17783, 18836, 19953, 21135, 22387, 23714, 25119,
+/* 177: */ 26607, 28184, 29854, 31623, 33497, 35481, 37584, 39811,
+/* 185: */ 42170, 44668, 47315, 50119, 53088, 56234, 59566, 63096
+};
+
+u16 brcmu_qdbm_to_mw(u8 qdbm)
+{
+ uint factor = 1;
+ int idx = qdbm - QDBM_OFFSET;
+
+ if (idx >= QDBM_TABLE_LEN)
+ /* clamp to max u16 mW value */
+ return 0xFFFF;
+
+ /* scale the qdBm index up to the range of the table 0-40
+ * where an offset of 40 qdBm equals a factor of 10 mW.
+ */
+ while (idx < 0) {
+ idx += 40;
+ factor *= 10;
+ }
+
+ /* return the mW value scaled down to the correct factor of 10,
+ * adding in factor/2 to get proper rounding.
+ */
+ return (nqdBm_to_mW_map[idx] + factor / 2) / factor;
+}
+EXPORT_SYMBOL(brcmu_qdbm_to_mw);
+
+u8 brcmu_mw_to_qdbm(u16 mw)
+{
+ u8 qdbm;
+ int offset;
+ uint mw_uint = mw;
+ uint boundary;
+
+ /* handle boundary case */
+ if (mw_uint <= 1)
+ return 0;
+
+ offset = QDBM_OFFSET;
+
+ /* move mw into the range of the table */
+ while (mw_uint < QDBM_TABLE_LOW_BOUND) {
+ mw_uint *= 10;
+ offset -= 40;
+ }
+
+ for (qdbm = 0; qdbm < QDBM_TABLE_LEN - 1; qdbm++) {
+ boundary = nqdBm_to_mW_map[qdbm] + (nqdBm_to_mW_map[qdbm + 1] -
+ nqdBm_to_mW_map[qdbm]) / 2;
+ if (mw_uint < boundary)
+ break;
+ }
+
+ qdbm += (u8) offset;
+
+ return qdbm;
+}
+EXPORT_SYMBOL(brcmu_mw_to_qdbm);
+
+uint brcmu_bitcount(u8 *bitmap, uint length)
+{
+ uint bitcount = 0, i;
+ u8 tmp;
+ for (i = 0; i < length; i++) {
+ tmp = bitmap[i];
+ while (tmp) {
+ bitcount++;
+ tmp &= (tmp - 1);
+ }
+ }
+ return bitcount;
+}
+EXPORT_SYMBOL(brcmu_bitcount);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-21 21:23:28 +0000