![Naveen Jain](/assets/img/avatar_default.png)
Older mechanism of counting the number of protocols registered with ST was slow, in-efficient. It used to check the protocol data for NULL for each registration/unregistration. With this change, counting protocols in maintained by a single counter protos_registered. Counting protocols is not just for debug purposes Signed-off-by: Naveen Jain <naveen_jain@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1066 lines
27 KiB
C
1066 lines
27 KiB
C
/*
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* Shared Transport Line discipline driver Core
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* This hooks up ST KIM driver and ST LL driver
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* Copyright (C) 2009 Texas Instruments
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#define pr_fmt(fmt) "(stc): " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/tty.h>
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/* understand BT, FM and GPS for now */
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#include <net/bluetooth/hci.h>
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#include "fm.h"
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/*
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* packet formats for fm and gps
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* #include "gps.h"
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*/
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#include "st_core.h"
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#include "st_kim.h"
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#include "st_ll.h"
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#include "st.h"
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#ifdef DEBUG
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/* strings to be used for rfkill entries and by
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* ST Core to be used for sysfs debug entry
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*/
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#define PROTO_ENTRY(type, name) name
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const unsigned char *protocol_strngs[] = {
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PROTO_ENTRY(ST_BT, "Bluetooth"),
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PROTO_ENTRY(ST_FM, "FM"),
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PROTO_ENTRY(ST_GPS, "GPS"),
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};
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#endif
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/* function pointer pointing to either,
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* st_kim_recv during registration to receive fw download responses
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* st_int_recv after registration to receive proto stack responses
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*/
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void (*st_recv) (void*, const unsigned char*, long);
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/********************************************************************/
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#if 0
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/* internal misc functions */
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bool is_protocol_list_empty(void)
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{
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unsigned char i = 0;
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pr_info(" %s ", __func__);
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for (i = 0; i < ST_MAX; i++) {
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if (st_gdata->list[i] != NULL)
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return ST_NOTEMPTY;
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/* not empty */
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}
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/* list empty */
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return ST_EMPTY;
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}
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#endif
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/* can be called in from
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* -- KIM (during fw download)
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* -- ST Core (during st_write)
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*
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* This is the internal write function - a wrapper
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* to tty->ops->write
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*/
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int st_int_write(struct st_data_s *st_gdata,
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const unsigned char *data, int count)
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{
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#ifdef VERBOSE /* for debug */
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int i;
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#endif
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struct tty_struct *tty;
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if (unlikely(st_gdata == NULL || st_gdata->tty == NULL)) {
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pr_err("tty unavailable to perform write");
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return ST_ERR_FAILURE;
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}
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tty = st_gdata->tty;
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#ifdef VERBOSE
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printk(KERN_ERR "start data..\n");
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for (i = 0; i < count; i++) /* no newlines for each datum */
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printk(" %x", data[i]);
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printk(KERN_ERR "\n ..end data\n");
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#endif
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return tty->ops->write(tty, data, count);
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}
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/*
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* push the skb received to relevant
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* protocol stacks
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*/
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void st_send_frame(enum proto_type protoid, struct st_data_s *st_gdata)
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{
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pr_info(" %s(prot:%d) ", __func__, protoid);
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if (unlikely
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(st_gdata == NULL || st_gdata->rx_skb == NULL
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|| st_gdata->list[protoid] == NULL)) {
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pr_err("protocol %d not registered, no data to send?",
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protoid);
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kfree_skb(st_gdata->rx_skb);
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return;
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}
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/* this cannot fail
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* this shouldn't take long
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* - should be just skb_queue_tail for the
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* protocol stack driver
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*/
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if (likely(st_gdata->list[protoid]->recv != NULL)) {
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if (unlikely(st_gdata->list[protoid]->recv(st_gdata->rx_skb)
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!= ST_SUCCESS)) {
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pr_err(" proto stack %d's ->recv failed", protoid);
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kfree_skb(st_gdata->rx_skb);
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return;
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}
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} else {
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pr_err(" proto stack %d's ->recv null", protoid);
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kfree_skb(st_gdata->rx_skb);
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}
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pr_info(" done %s", __func__);
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return;
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}
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/*
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* to call registration complete callbacks
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* of all protocol stack drivers
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*/
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void st_reg_complete(struct st_data_s *st_gdata, char err)
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{
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unsigned char i = 0;
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pr_info(" %s ", __func__);
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for (i = 0; i < ST_MAX; i++) {
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if (likely(st_gdata != NULL && st_gdata->list[i] != NULL &&
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st_gdata->list[i]->reg_complete_cb != NULL))
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st_gdata->list[i]->reg_complete_cb(err);
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}
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}
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static inline int st_check_data_len(struct st_data_s *st_gdata,
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int protoid, int len)
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{
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register int room = skb_tailroom(st_gdata->rx_skb);
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pr_info("len %d room %d", len, room);
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if (!len) {
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/* Received packet has only packet header and
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* has zero length payload. So, ask ST CORE to
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* forward the packet to protocol driver (BT/FM/GPS)
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*/
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st_send_frame(protoid, st_gdata);
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} else if (len > room) {
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/* Received packet's payload length is larger.
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* We can't accommodate it in created skb.
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*/
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pr_err("Data length is too large len %d room %d", len,
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room);
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kfree_skb(st_gdata->rx_skb);
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} else {
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/* Packet header has non-zero payload length and
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* we have enough space in created skb. Lets read
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* payload data */
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st_gdata->rx_state = ST_BT_W4_DATA;
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st_gdata->rx_count = len;
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return len;
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}
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/* Change ST state to continue to process next
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* packet */
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st_gdata->rx_state = ST_W4_PACKET_TYPE;
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st_gdata->rx_skb = NULL;
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st_gdata->rx_count = 0;
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return 0;
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}
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/* internal function for action when wake-up ack
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* received
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*/
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static inline void st_wakeup_ack(struct st_data_s *st_gdata,
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unsigned char cmd)
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{
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register struct sk_buff *waiting_skb;
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unsigned long flags = 0;
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spin_lock_irqsave(&st_gdata->lock, flags);
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/* de-Q from waitQ and Q in txQ now that the
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* chip is awake
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*/
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while ((waiting_skb = skb_dequeue(&st_gdata->tx_waitq)))
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skb_queue_tail(&st_gdata->txq, waiting_skb);
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/* state forwarded to ST LL */
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st_ll_sleep_state(st_gdata, (unsigned long)cmd);
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spin_unlock_irqrestore(&st_gdata->lock, flags);
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/* wake up to send the recently copied skbs from waitQ */
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st_tx_wakeup(st_gdata);
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}
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/* Decodes received RAW data and forwards to corresponding
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* client drivers (Bluetooth,FM,GPS..etc).
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*
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*/
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void st_int_recv(void *disc_data,
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const unsigned char *data, long count)
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{
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register char *ptr;
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struct hci_event_hdr *eh;
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struct hci_acl_hdr *ah;
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struct hci_sco_hdr *sh;
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struct fm_event_hdr *fm;
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struct gps_event_hdr *gps;
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register int len = 0, type = 0, dlen = 0;
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static enum proto_type protoid = ST_MAX;
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struct st_data_s *st_gdata = (struct st_data_s *)disc_data;
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ptr = (char *)data;
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/* tty_receive sent null ? */
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if (unlikely(ptr == NULL) || (st_gdata == NULL)) {
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pr_err(" received null from TTY ");
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return;
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}
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pr_info("count %ld rx_state %ld"
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"rx_count %ld", count, st_gdata->rx_state,
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st_gdata->rx_count);
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/* Decode received bytes here */
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while (count) {
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if (st_gdata->rx_count) {
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len = min_t(unsigned int, st_gdata->rx_count, count);
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memcpy(skb_put(st_gdata->rx_skb, len), ptr, len);
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st_gdata->rx_count -= len;
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count -= len;
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ptr += len;
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if (st_gdata->rx_count)
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continue;
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/* Check ST RX state machine , where are we? */
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switch (st_gdata->rx_state) {
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/* Waiting for complete packet ? */
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case ST_BT_W4_DATA:
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pr_info("Complete pkt received");
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/* Ask ST CORE to forward
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* the packet to protocol driver */
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st_send_frame(protoid, st_gdata);
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st_gdata->rx_state = ST_W4_PACKET_TYPE;
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st_gdata->rx_skb = NULL;
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protoid = ST_MAX; /* is this required ? */
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continue;
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/* Waiting for Bluetooth event header ? */
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case ST_BT_W4_EVENT_HDR:
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eh = (struct hci_event_hdr *)st_gdata->rx_skb->
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data;
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pr_info("Event header: evt 0x%2.2x"
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"plen %d", eh->evt, eh->plen);
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st_check_data_len(st_gdata, protoid, eh->plen);
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continue;
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/* Waiting for Bluetooth acl header ? */
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case ST_BT_W4_ACL_HDR:
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ah = (struct hci_acl_hdr *)st_gdata->rx_skb->
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data;
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dlen = __le16_to_cpu(ah->dlen);
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pr_info("ACL header: dlen %d", dlen);
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st_check_data_len(st_gdata, protoid, dlen);
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continue;
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/* Waiting for Bluetooth sco header ? */
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case ST_BT_W4_SCO_HDR:
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sh = (struct hci_sco_hdr *)st_gdata->rx_skb->
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data;
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pr_info("SCO header: dlen %d", sh->dlen);
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st_check_data_len(st_gdata, protoid, sh->dlen);
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continue;
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case ST_FM_W4_EVENT_HDR:
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fm = (struct fm_event_hdr *)st_gdata->rx_skb->
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data;
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pr_info("FM Header: ");
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st_check_data_len(st_gdata, ST_FM, fm->plen);
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continue;
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/* TODO : Add GPS packet machine logic here */
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case ST_GPS_W4_EVENT_HDR:
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/* [0x09 pkt hdr][R/W byte][2 byte len] */
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gps = (struct gps_event_hdr *)st_gdata->rx_skb->
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data;
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pr_info("GPS Header: ");
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st_check_data_len(st_gdata, ST_GPS, gps->plen);
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continue;
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} /* end of switch rx_state */
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}
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/* end of if rx_count */
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/* Check first byte of packet and identify module
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* owner (BT/FM/GPS) */
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switch (*ptr) {
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/* Bluetooth event packet? */
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case HCI_EVENT_PKT:
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pr_info("Event packet");
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st_gdata->rx_state = ST_BT_W4_EVENT_HDR;
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st_gdata->rx_count = HCI_EVENT_HDR_SIZE;
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type = HCI_EVENT_PKT;
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protoid = ST_BT;
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break;
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/* Bluetooth acl packet? */
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case HCI_ACLDATA_PKT:
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pr_info("ACL packet");
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st_gdata->rx_state = ST_BT_W4_ACL_HDR;
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st_gdata->rx_count = HCI_ACL_HDR_SIZE;
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type = HCI_ACLDATA_PKT;
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protoid = ST_BT;
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break;
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/* Bluetooth sco packet? */
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case HCI_SCODATA_PKT:
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pr_info("SCO packet");
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st_gdata->rx_state = ST_BT_W4_SCO_HDR;
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st_gdata->rx_count = HCI_SCO_HDR_SIZE;
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type = HCI_SCODATA_PKT;
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protoid = ST_BT;
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break;
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/* Channel 8(FM) packet? */
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case ST_FM_CH8_PKT:
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pr_info("FM CH8 packet");
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type = ST_FM_CH8_PKT;
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st_gdata->rx_state = ST_FM_W4_EVENT_HDR;
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st_gdata->rx_count = FM_EVENT_HDR_SIZE;
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protoid = ST_FM;
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break;
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/* Channel 9(GPS) packet? */
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case 0x9: /*ST_LL_GPS_CH9_PKT */
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pr_info("GPS CH9 packet");
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type = 0x9; /* ST_LL_GPS_CH9_PKT; */
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protoid = ST_GPS;
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st_gdata->rx_state = ST_GPS_W4_EVENT_HDR;
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st_gdata->rx_count = 3; /* GPS_EVENT_HDR_SIZE -1*/
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break;
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case LL_SLEEP_IND:
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case LL_SLEEP_ACK:
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case LL_WAKE_UP_IND:
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pr_info("PM packet");
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/* this takes appropriate action based on
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* sleep state received --
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*/
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st_ll_sleep_state(st_gdata, *ptr);
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ptr++;
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count--;
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continue;
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case LL_WAKE_UP_ACK:
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pr_info("PM packet");
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/* wake up ack received */
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st_wakeup_ack(st_gdata, *ptr);
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ptr++;
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count--;
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continue;
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/* Unknow packet? */
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default:
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pr_err("Unknown packet type %2.2x", (__u8) *ptr);
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ptr++;
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count--;
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continue;
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};
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ptr++;
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count--;
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switch (protoid) {
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case ST_BT:
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/* Allocate new packet to hold received data */
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st_gdata->rx_skb =
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bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
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if (!st_gdata->rx_skb) {
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pr_err("Can't allocate mem for new packet");
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st_gdata->rx_state = ST_W4_PACKET_TYPE;
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st_gdata->rx_count = 0;
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return;
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}
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bt_cb(st_gdata->rx_skb)->pkt_type = type;
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break;
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case ST_FM: /* for FM */
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st_gdata->rx_skb =
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alloc_skb(FM_MAX_FRAME_SIZE, GFP_ATOMIC);
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if (!st_gdata->rx_skb) {
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pr_err("Can't allocate mem for new packet");
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st_gdata->rx_state = ST_W4_PACKET_TYPE;
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st_gdata->rx_count = 0;
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return;
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}
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/* place holder 0x08 */
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skb_reserve(st_gdata->rx_skb, 1);
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st_gdata->rx_skb->cb[0] = ST_FM_CH8_PKT;
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break;
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case ST_GPS:
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/* for GPS */
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st_gdata->rx_skb =
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alloc_skb(100 /*GPS_MAX_FRAME_SIZE */ , GFP_ATOMIC);
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if (!st_gdata->rx_skb) {
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pr_err("Can't allocate mem for new packet");
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st_gdata->rx_state = ST_W4_PACKET_TYPE;
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st_gdata->rx_count = 0;
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return;
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}
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/* place holder 0x09 */
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skb_reserve(st_gdata->rx_skb, 1);
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st_gdata->rx_skb->cb[0] = 0x09; /*ST_GPS_CH9_PKT; */
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break;
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case ST_MAX:
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break;
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}
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}
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pr_info("done %s", __func__);
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return;
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}
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/* internal de-Q function
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* -- return previous in-completely written skb
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* or return the skb in the txQ
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*/
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struct sk_buff *st_int_dequeue(struct st_data_s *st_gdata)
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{
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struct sk_buff *returning_skb;
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pr_info("%s", __func__);
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/* if the previous skb wasn't written completely
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*/
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if (st_gdata->tx_skb != NULL) {
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returning_skb = st_gdata->tx_skb;
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st_gdata->tx_skb = NULL;
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return returning_skb;
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}
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/* de-Q from the txQ always if previous write is complete */
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return skb_dequeue(&st_gdata->txq);
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}
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/* internal Q-ing function
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* will either Q the skb to txq or the tx_waitq
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* depending on the ST LL state
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*
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* lock the whole func - since ll_getstate and Q-ing should happen
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* in one-shot
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*/
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void st_int_enqueue(struct st_data_s *st_gdata, struct sk_buff *skb)
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{
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unsigned long flags = 0;
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pr_info("%s", __func__);
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/* this function can be invoked in more then one context.
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* so have a lock */
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spin_lock_irqsave(&st_gdata->lock, flags);
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switch (st_ll_getstate(st_gdata)) {
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case ST_LL_AWAKE:
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pr_info("ST LL is AWAKE, sending normally");
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skb_queue_tail(&st_gdata->txq, skb);
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break;
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case ST_LL_ASLEEP_TO_AWAKE:
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skb_queue_tail(&st_gdata->tx_waitq, skb);
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break;
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case ST_LL_AWAKE_TO_ASLEEP: /* host cannot be in this state */
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pr_err("ST LL is illegal state(%ld),"
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"purging received skb.", st_ll_getstate(st_gdata));
|
|
kfree_skb(skb);
|
|
break;
|
|
|
|
case ST_LL_ASLEEP:
|
|
/* call a function of ST LL to put data
|
|
* in tx_waitQ and wake_ind in txQ
|
|
*/
|
|
skb_queue_tail(&st_gdata->tx_waitq, skb);
|
|
st_ll_wakeup(st_gdata);
|
|
break;
|
|
default:
|
|
pr_err("ST LL is illegal state(%ld),"
|
|
"purging received skb.", st_ll_getstate(st_gdata));
|
|
kfree_skb(skb);
|
|
break;
|
|
}
|
|
spin_unlock_irqrestore(&st_gdata->lock, flags);
|
|
pr_info("done %s", __func__);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* internal wakeup function
|
|
* called from either
|
|
* - TTY layer when write's finished
|
|
* - st_write (in context of the protocol stack)
|
|
*/
|
|
void st_tx_wakeup(struct st_data_s *st_data)
|
|
{
|
|
struct sk_buff *skb;
|
|
unsigned long flags; /* for irq save flags */
|
|
pr_info("%s", __func__);
|
|
/* check for sending & set flag sending here */
|
|
if (test_and_set_bit(ST_TX_SENDING, &st_data->tx_state)) {
|
|
pr_info("ST already sending");
|
|
/* keep sending */
|
|
set_bit(ST_TX_WAKEUP, &st_data->tx_state);
|
|
return;
|
|
/* TX_WAKEUP will be checked in another
|
|
* context
|
|
*/
|
|
}
|
|
do { /* come back if st_tx_wakeup is set */
|
|
/* woke-up to write */
|
|
clear_bit(ST_TX_WAKEUP, &st_data->tx_state);
|
|
while ((skb = st_int_dequeue(st_data))) {
|
|
int len;
|
|
spin_lock_irqsave(&st_data->lock, flags);
|
|
/* enable wake-up from TTY */
|
|
set_bit(TTY_DO_WRITE_WAKEUP, &st_data->tty->flags);
|
|
len = st_int_write(st_data, skb->data, skb->len);
|
|
skb_pull(skb, len);
|
|
/* if skb->len = len as expected, skb->len=0 */
|
|
if (skb->len) {
|
|
/* would be the next skb to be sent */
|
|
st_data->tx_skb = skb;
|
|
spin_unlock_irqrestore(&st_data->lock, flags);
|
|
break;
|
|
}
|
|
kfree_skb(skb);
|
|
spin_unlock_irqrestore(&st_data->lock, flags);
|
|
}
|
|
/* if wake-up is set in another context- restart sending */
|
|
} while (test_bit(ST_TX_WAKEUP, &st_data->tx_state));
|
|
|
|
/* clear flag sending */
|
|
clear_bit(ST_TX_SENDING, &st_data->tx_state);
|
|
}
|
|
|
|
/********************************************************************/
|
|
/* functions called from ST KIM
|
|
*/
|
|
void kim_st_list_protocols(struct st_data_s *st_gdata, char *buf)
|
|
{
|
|
unsigned long flags = 0;
|
|
#ifdef DEBUG
|
|
unsigned char i = ST_MAX;
|
|
#endif
|
|
spin_lock_irqsave(&st_gdata->lock, flags);
|
|
#ifdef DEBUG /* more detailed log */
|
|
for (i = 0; i < ST_MAX; i++) {
|
|
if (i == 0) {
|
|
sprintf(buf, "%s is %s", protocol_strngs[i],
|
|
st_gdata->list[i] !=
|
|
NULL ? "Registered" : "Unregistered");
|
|
} else {
|
|
sprintf(buf, "%s\n%s is %s", buf, protocol_strngs[i],
|
|
st_gdata->list[i] !=
|
|
NULL ? "Registered" : "Unregistered");
|
|
}
|
|
}
|
|
sprintf(buf, "%s\n", buf);
|
|
#else /* limited info */
|
|
sprintf(buf, "[%d]\nBT=%c\nFM=%c\nGPS=%c\n",
|
|
st_gdata->protos_registered,
|
|
st_gdata->list[ST_BT] != NULL ? 'R' : 'U',
|
|
st_gdata->list[ST_FM] != NULL ? 'R' : 'U',
|
|
st_gdata->list[ST_GPS] != NULL ? 'R' : 'U');
|
|
#endif
|
|
spin_unlock_irqrestore(&st_gdata->lock, flags);
|
|
}
|
|
|
|
/********************************************************************/
|
|
/*
|
|
* functions called from protocol stack drivers
|
|
* to be EXPORT-ed
|
|
*/
|
|
long st_register(struct st_proto_s *new_proto)
|
|
{
|
|
struct st_data_s *st_gdata;
|
|
long err = ST_SUCCESS;
|
|
unsigned long flags = 0;
|
|
|
|
st_kim_ref(&st_gdata);
|
|
pr_info("%s(%d) ", __func__, new_proto->type);
|
|
if (st_gdata == NULL || new_proto == NULL || new_proto->recv == NULL
|
|
|| new_proto->reg_complete_cb == NULL) {
|
|
pr_err("gdata/new_proto/recv or reg_complete_cb not ready");
|
|
return ST_ERR_FAILURE;
|
|
}
|
|
|
|
if (new_proto->type < ST_BT || new_proto->type >= ST_MAX) {
|
|
pr_err("protocol %d not supported", new_proto->type);
|
|
return ST_ERR_NOPROTO;
|
|
}
|
|
|
|
if (st_gdata->list[new_proto->type] != NULL) {
|
|
pr_err("protocol %d already registered", new_proto->type);
|
|
return ST_ERR_ALREADY;
|
|
}
|
|
|
|
/* can be from process context only */
|
|
spin_lock_irqsave(&st_gdata->lock, flags);
|
|
|
|
if (test_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state)) {
|
|
pr_info(" ST_REG_IN_PROGRESS:%d ", new_proto->type);
|
|
/* fw download in progress */
|
|
st_kim_chip_toggle(new_proto->type, KIM_GPIO_ACTIVE);
|
|
|
|
st_gdata->list[new_proto->type] = new_proto;
|
|
st_gdata->protos_registered++;
|
|
new_proto->write = st_write;
|
|
|
|
set_bit(ST_REG_PENDING, &st_gdata->st_state);
|
|
spin_unlock_irqrestore(&st_gdata->lock, flags);
|
|
return ST_ERR_PENDING;
|
|
} else if (st_gdata->protos_registered == ST_EMPTY) {
|
|
pr_info(" protocol list empty :%d ", new_proto->type);
|
|
set_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state);
|
|
st_recv = st_kim_recv;
|
|
|
|
/* release lock previously held - re-locked below */
|
|
spin_unlock_irqrestore(&st_gdata->lock, flags);
|
|
|
|
/* enable the ST LL - to set default chip state */
|
|
st_ll_enable(st_gdata);
|
|
/* this may take a while to complete
|
|
* since it involves BT fw download
|
|
*/
|
|
err = st_kim_start();
|
|
if (err != ST_SUCCESS) {
|
|
clear_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state);
|
|
if ((st_gdata->protos_registered != ST_EMPTY) &&
|
|
(test_bit(ST_REG_PENDING, &st_gdata->st_state))) {
|
|
pr_err(" KIM failure complete callback ");
|
|
st_reg_complete(st_gdata, ST_ERR_FAILURE);
|
|
}
|
|
|
|
return ST_ERR_FAILURE;
|
|
}
|
|
|
|
/* the protocol might require other gpios to be toggled
|
|
*/
|
|
st_kim_chip_toggle(new_proto->type, KIM_GPIO_ACTIVE);
|
|
|
|
clear_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state);
|
|
st_recv = st_int_recv;
|
|
|
|
/* this is where all pending registration
|
|
* are signalled to be complete by calling callback functions
|
|
*/
|
|
if ((st_gdata->protos_registered != ST_EMPTY) &&
|
|
(test_bit(ST_REG_PENDING, &st_gdata->st_state))) {
|
|
pr_info(" call reg complete callback ");
|
|
st_reg_complete(st_gdata, ST_SUCCESS);
|
|
}
|
|
clear_bit(ST_REG_PENDING, &st_gdata->st_state);
|
|
|
|
/* check for already registered once more,
|
|
* since the above check is old
|
|
*/
|
|
if (st_gdata->list[new_proto->type] != NULL) {
|
|
pr_err(" proto %d already registered ",
|
|
new_proto->type);
|
|
return ST_ERR_ALREADY;
|
|
}
|
|
|
|
spin_lock_irqsave(&st_gdata->lock, flags);
|
|
st_gdata->list[new_proto->type] = new_proto;
|
|
st_gdata->protos_registered++;
|
|
new_proto->write = st_write;
|
|
spin_unlock_irqrestore(&st_gdata->lock, flags);
|
|
return err;
|
|
}
|
|
/* if fw is already downloaded & new stack registers protocol */
|
|
else {
|
|
switch (new_proto->type) {
|
|
case ST_BT:
|
|
/* do nothing */
|
|
break;
|
|
case ST_FM:
|
|
case ST_GPS:
|
|
st_kim_chip_toggle(new_proto->type, KIM_GPIO_ACTIVE);
|
|
break;
|
|
case ST_MAX:
|
|
default:
|
|
pr_err("%d protocol not supported",
|
|
new_proto->type);
|
|
err = ST_ERR_NOPROTO;
|
|
/* something wrong */
|
|
break;
|
|
}
|
|
st_gdata->list[new_proto->type] = new_proto;
|
|
st_gdata->protos_registered++;
|
|
new_proto->write = st_write;
|
|
|
|
/* lock already held before entering else */
|
|
spin_unlock_irqrestore(&st_gdata->lock, flags);
|
|
return err;
|
|
}
|
|
pr_info("done %s(%d) ", __func__, new_proto->type);
|
|
}
|
|
EXPORT_SYMBOL_GPL(st_register);
|
|
|
|
/* to unregister a protocol -
|
|
* to be called from protocol stack driver
|
|
*/
|
|
long st_unregister(enum proto_type type)
|
|
{
|
|
long err = ST_SUCCESS;
|
|
unsigned long flags = 0;
|
|
struct st_data_s *st_gdata;
|
|
|
|
pr_info("%s: %d ", __func__, type);
|
|
|
|
st_kim_ref(&st_gdata);
|
|
if (type < ST_BT || type >= ST_MAX) {
|
|
pr_err(" protocol %d not supported", type);
|
|
return ST_ERR_NOPROTO;
|
|
}
|
|
|
|
spin_lock_irqsave(&st_gdata->lock, flags);
|
|
|
|
if (st_gdata->list[type] == NULL) {
|
|
pr_err(" protocol %d not registered", type);
|
|
spin_unlock_irqrestore(&st_gdata->lock, flags);
|
|
return ST_ERR_NOPROTO;
|
|
}
|
|
|
|
st_gdata->protos_registered--;
|
|
st_gdata->list[type] = NULL;
|
|
|
|
/* kim ignores BT in the below function
|
|
* and handles the rest, BT is toggled
|
|
* only in kim_start and kim_stop
|
|
*/
|
|
st_kim_chip_toggle(type, KIM_GPIO_INACTIVE);
|
|
spin_unlock_irqrestore(&st_gdata->lock, flags);
|
|
|
|
if ((st_gdata->protos_registered == ST_EMPTY) &&
|
|
(!test_bit(ST_REG_PENDING, &st_gdata->st_state))) {
|
|
pr_info(" all protocols unregistered ");
|
|
|
|
/* stop traffic on tty */
|
|
if (st_gdata->tty) {
|
|
tty_ldisc_flush(st_gdata->tty);
|
|
stop_tty(st_gdata->tty);
|
|
}
|
|
|
|
/* all protocols now unregistered */
|
|
st_kim_stop();
|
|
/* disable ST LL */
|
|
st_ll_disable(st_gdata);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* called in protocol stack drivers
|
|
* via the write function pointer
|
|
*/
|
|
long st_write(struct sk_buff *skb)
|
|
{
|
|
struct st_data_s *st_gdata;
|
|
#ifdef DEBUG
|
|
enum proto_type protoid = ST_MAX;
|
|
#endif
|
|
long len;
|
|
|
|
st_kim_ref(&st_gdata);
|
|
if (unlikely(skb == NULL || st_gdata == NULL
|
|
|| st_gdata->tty == NULL)) {
|
|
pr_err("data/tty unavailable to perform write");
|
|
return ST_ERR_FAILURE;
|
|
}
|
|
#ifdef DEBUG /* open-up skb to read the 1st byte */
|
|
switch (skb->data[0]) {
|
|
case HCI_COMMAND_PKT:
|
|
case HCI_ACLDATA_PKT:
|
|
case HCI_SCODATA_PKT:
|
|
protoid = ST_BT;
|
|
break;
|
|
case ST_FM_CH8_PKT:
|
|
protoid = ST_FM;
|
|
break;
|
|
case 0x09:
|
|
protoid = ST_GPS;
|
|
break;
|
|
}
|
|
if (unlikely(st_gdata->list[protoid] == NULL)) {
|
|
pr_err(" protocol %d not registered, and writing? ",
|
|
protoid);
|
|
return ST_ERR_FAILURE;
|
|
}
|
|
#endif
|
|
pr_info("%d to be written", skb->len);
|
|
len = skb->len;
|
|
|
|
/* st_ll to decide where to enqueue the skb */
|
|
st_int_enqueue(st_gdata, skb);
|
|
/* wake up */
|
|
st_tx_wakeup(st_gdata);
|
|
|
|
/* return number of bytes written */
|
|
return len;
|
|
}
|
|
|
|
/* for protocols making use of shared transport */
|
|
EXPORT_SYMBOL_GPL(st_unregister);
|
|
|
|
/********************************************************************/
|
|
/*
|
|
* functions called from TTY layer
|
|
*/
|
|
static int st_tty_open(struct tty_struct *tty)
|
|
{
|
|
int err = ST_SUCCESS;
|
|
struct st_data_s *st_gdata;
|
|
pr_info("%s ", __func__);
|
|
|
|
st_kim_ref(&st_gdata);
|
|
st_gdata->tty = tty;
|
|
tty->disc_data = st_gdata;
|
|
|
|
/* don't do an wakeup for now */
|
|
clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
|
|
|
|
/* mem already allocated
|
|
*/
|
|
tty->receive_room = 65536;
|
|
/* Flush any pending characters in the driver and discipline. */
|
|
tty_ldisc_flush(tty);
|
|
tty_driver_flush_buffer(tty);
|
|
/*
|
|
* signal to UIM via KIM that -
|
|
* installation of N_TI_WL ldisc is complete
|
|
*/
|
|
st_kim_complete();
|
|
pr_info("done %s", __func__);
|
|
return err;
|
|
}
|
|
|
|
static void st_tty_close(struct tty_struct *tty)
|
|
{
|
|
unsigned char i = ST_MAX;
|
|
unsigned long flags = 0;
|
|
struct st_data_s *st_gdata = tty->disc_data;
|
|
|
|
pr_info("%s ", __func__);
|
|
|
|
/* TODO:
|
|
* if a protocol has been registered & line discipline
|
|
* un-installed for some reason - what should be done ?
|
|
*/
|
|
spin_lock_irqsave(&st_gdata->lock, flags);
|
|
for (i = ST_BT; i < ST_MAX; i++) {
|
|
if (st_gdata->list[i] != NULL)
|
|
pr_err("%d not un-registered", i);
|
|
st_gdata->list[i] = NULL;
|
|
}
|
|
spin_unlock_irqrestore(&st_gdata->lock, flags);
|
|
/*
|
|
* signal to UIM via KIM that -
|
|
* N_TI_WL ldisc is un-installed
|
|
*/
|
|
st_kim_complete();
|
|
st_gdata->tty = NULL;
|
|
/* Flush any pending characters in the driver and discipline. */
|
|
tty_ldisc_flush(tty);
|
|
tty_driver_flush_buffer(tty);
|
|
|
|
spin_lock_irqsave(&st_gdata->lock, flags);
|
|
/* empty out txq and tx_waitq */
|
|
skb_queue_purge(&st_gdata->txq);
|
|
skb_queue_purge(&st_gdata->tx_waitq);
|
|
/* reset the TTY Rx states of ST */
|
|
st_gdata->rx_count = 0;
|
|
st_gdata->rx_state = ST_W4_PACKET_TYPE;
|
|
kfree_skb(st_gdata->rx_skb);
|
|
st_gdata->rx_skb = NULL;
|
|
spin_unlock_irqrestore(&st_gdata->lock, flags);
|
|
|
|
pr_info("%s: done ", __func__);
|
|
}
|
|
|
|
static void st_tty_receive(struct tty_struct *tty, const unsigned char *data,
|
|
char *tty_flags, int count)
|
|
{
|
|
|
|
#ifdef VERBOSE
|
|
long i;
|
|
printk(KERN_ERR "incoming data...\n");
|
|
for (i = 0; i < count; i++)
|
|
printk(" %x", data[i]);
|
|
printk(KERN_ERR "\n.. data end\n");
|
|
#endif
|
|
|
|
/*
|
|
* if fw download is in progress then route incoming data
|
|
* to KIM for validation
|
|
*/
|
|
st_recv(tty->disc_data, data, count);
|
|
pr_info("done %s", __func__);
|
|
}
|
|
|
|
/* wake-up function called in from the TTY layer
|
|
* inside the internal wakeup function will be called
|
|
*/
|
|
static void st_tty_wakeup(struct tty_struct *tty)
|
|
{
|
|
struct st_data_s *st_gdata = tty->disc_data;
|
|
pr_info("%s ", __func__);
|
|
/* don't do an wakeup for now */
|
|
clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
|
|
|
|
/* call our internal wakeup */
|
|
st_tx_wakeup((void *)st_gdata);
|
|
}
|
|
|
|
static void st_tty_flush_buffer(struct tty_struct *tty)
|
|
{
|
|
struct st_data_s *st_gdata = tty->disc_data;
|
|
pr_info("%s ", __func__);
|
|
|
|
kfree_skb(st_gdata->tx_skb);
|
|
st_gdata->tx_skb = NULL;
|
|
|
|
tty->ops->flush_buffer(tty);
|
|
return;
|
|
}
|
|
|
|
/********************************************************************/
|
|
int st_core_init(struct st_data_s **core_data)
|
|
{
|
|
struct st_data_s *st_gdata;
|
|
long err;
|
|
static struct tty_ldisc_ops *st_ldisc_ops;
|
|
|
|
/* populate and register to TTY line discipline */
|
|
st_ldisc_ops = kzalloc(sizeof(*st_ldisc_ops), GFP_KERNEL);
|
|
if (!st_ldisc_ops) {
|
|
pr_err("no mem to allocate");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
st_ldisc_ops->magic = TTY_LDISC_MAGIC;
|
|
st_ldisc_ops->name = "n_st"; /*"n_hci"; */
|
|
st_ldisc_ops->open = st_tty_open;
|
|
st_ldisc_ops->close = st_tty_close;
|
|
st_ldisc_ops->receive_buf = st_tty_receive;
|
|
st_ldisc_ops->write_wakeup = st_tty_wakeup;
|
|
st_ldisc_ops->flush_buffer = st_tty_flush_buffer;
|
|
st_ldisc_ops->owner = THIS_MODULE;
|
|
|
|
err = tty_register_ldisc(N_TI_WL, st_ldisc_ops);
|
|
if (err) {
|
|
pr_err("error registering %d line discipline %ld",
|
|
N_TI_WL, err);
|
|
kfree(st_ldisc_ops);
|
|
return err;
|
|
}
|
|
pr_info("registered n_shared line discipline");
|
|
|
|
st_gdata = kzalloc(sizeof(struct st_data_s), GFP_KERNEL);
|
|
if (!st_gdata) {
|
|
pr_err("memory allocation failed");
|
|
err = tty_unregister_ldisc(N_TI_WL);
|
|
if (err)
|
|
pr_err("unable to un-register ldisc %ld", err);
|
|
kfree(st_ldisc_ops);
|
|
err = -ENOMEM;
|
|
return err;
|
|
}
|
|
|
|
/* Initialize ST TxQ and Tx waitQ queue head. All BT/FM/GPS module skb's
|
|
* will be pushed in this queue for actual transmission.
|
|
*/
|
|
skb_queue_head_init(&st_gdata->txq);
|
|
skb_queue_head_init(&st_gdata->tx_waitq);
|
|
|
|
/* Locking used in st_int_enqueue() to avoid multiple execution */
|
|
spin_lock_init(&st_gdata->lock);
|
|
|
|
/* ldisc_ops ref to be only used in __exit of module */
|
|
st_gdata->ldisc_ops = st_ldisc_ops;
|
|
|
|
#if 0
|
|
err = st_kim_init();
|
|
if (err) {
|
|
pr_err("error during kim initialization(%ld)", err);
|
|
kfree(st_gdata);
|
|
err = tty_unregister_ldisc(N_TI_WL);
|
|
if (err)
|
|
pr_err("unable to un-register ldisc");
|
|
kfree(st_ldisc_ops);
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
err = st_ll_init(st_gdata);
|
|
if (err) {
|
|
pr_err("error during st_ll initialization(%ld)", err);
|
|
kfree(st_gdata);
|
|
err = tty_unregister_ldisc(N_TI_WL);
|
|
if (err)
|
|
pr_err("unable to un-register ldisc");
|
|
kfree(st_ldisc_ops);
|
|
return -1;
|
|
}
|
|
*core_data = st_gdata;
|
|
return 0;
|
|
}
|
|
|
|
void st_core_exit(struct st_data_s *st_gdata)
|
|
{
|
|
long err;
|
|
/* internal module cleanup */
|
|
err = st_ll_deinit(st_gdata);
|
|
if (err)
|
|
pr_err("error during deinit of ST LL %ld", err);
|
|
#if 0
|
|
err = st_kim_deinit();
|
|
if (err)
|
|
pr_err("error during deinit of ST KIM %ld", err);
|
|
#endif
|
|
if (st_gdata != NULL) {
|
|
/* Free ST Tx Qs and skbs */
|
|
skb_queue_purge(&st_gdata->txq);
|
|
skb_queue_purge(&st_gdata->tx_waitq);
|
|
kfree_skb(st_gdata->rx_skb);
|
|
kfree_skb(st_gdata->tx_skb);
|
|
/* TTY ldisc cleanup */
|
|
err = tty_unregister_ldisc(N_TI_WL);
|
|
if (err)
|
|
pr_err("unable to un-register ldisc %ld", err);
|
|
kfree(st_gdata->ldisc_ops);
|
|
/* free the global data pointer */
|
|
kfree(st_gdata);
|
|
}
|
|
}
|
|
|
|
|