924 lines
24 KiB
C
924 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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) 2009-2010 Texas Instruments
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* Author: Pavan Savoy <pavan_savoy@ti.com>
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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/tty.h>
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#include <linux/seq_file.h>
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#include <linux/skbuff.h>
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#include <linux/ti_wilink_st.h>
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extern void st_kim_recv(void *, const unsigned char *, long);
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void st_int_recv(void *, const unsigned char *, long);
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/*
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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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static void (*st_recv) (void *, const unsigned char *, long);
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/********************************************************************/
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static void add_channel_to_table(struct st_data_s *st_gdata,
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struct st_proto_s *new_proto)
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{
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pr_info("%s: id %d\n", __func__, new_proto->chnl_id);
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/* list now has the channel id as index itself */
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st_gdata->list[new_proto->chnl_id] = new_proto;
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st_gdata->is_registered[new_proto->chnl_id] = true;
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}
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static void remove_channel_from_table(struct st_data_s *st_gdata,
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struct st_proto_s *proto)
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{
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pr_info("%s: id %d\n", __func__, proto->chnl_id);
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/* st_gdata->list[proto->chnl_id] = NULL; */
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st_gdata->is_registered[proto->chnl_id] = false;
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}
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/*
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* called from KIM during firmware download.
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*
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* This is a wrapper function to tty->ops->write_room.
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* It returns number of free space available in
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* uart tx buffer.
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*/
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int st_get_uart_wr_room(struct st_data_s *st_gdata)
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{
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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 -1;
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}
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return tty_write_room(st_gdata->tty);
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}
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/*
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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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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 -EINVAL;
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}
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tty = st_gdata->tty;
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#ifdef VERBOSE
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print_hex_dump(KERN_DEBUG, "<out<", DUMP_PREFIX_NONE,
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16, 1, data, count, 0);
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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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static void st_send_frame(unsigned char chnl_id, struct st_data_s *st_gdata)
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{
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pr_debug(" %s(prot:%d) ", __func__, chnl_id);
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if (unlikely
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(st_gdata == NULL || st_gdata->rx_skb == NULL
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|| st_gdata->is_registered[chnl_id] == false)) {
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pr_err("chnl_id %d not registered, no data to send?",
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chnl_id);
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kfree_skb(st_gdata->rx_skb);
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return;
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}
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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[chnl_id]->recv != NULL)) {
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if (unlikely
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(st_gdata->list[chnl_id]->recv
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(st_gdata->list[chnl_id]->priv_data, st_gdata->rx_skb)
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!= 0)) {
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pr_err(" proto stack %d's ->recv failed", chnl_id);
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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", chnl_id);
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kfree_skb(st_gdata->rx_skb);
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}
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return;
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}
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/*
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* st_reg_complete - to call registration complete callbacks
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* of all protocol stack drivers
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* This function is being called with spin lock held, protocol drivers are
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* only expected to complete their waits and do nothing more than that.
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*/
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static void st_reg_complete(struct st_data_s *st_gdata, int 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_CHANNELS; i++) {
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if (likely(st_gdata != NULL &&
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st_gdata->is_registered[i] == true &&
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st_gdata->list[i]->reg_complete_cb != NULL)) {
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st_gdata->list[i]->reg_complete_cb
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(st_gdata->list[i]->priv_data, err);
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pr_info("protocol %d's cb sent %d\n", i, err);
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if (err) { /* cleanup registered protocol */
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st_gdata->is_registered[i] = false;
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if (st_gdata->protos_registered)
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st_gdata->protos_registered--;
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}
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}
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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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unsigned char chnl_id, int len)
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{
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int room = skb_tailroom(st_gdata->rx_skb);
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pr_debug("len %d room %d", len, room);
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if (!len) {
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/*
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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(chnl_id, st_gdata);
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} else if (len > room) {
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/*
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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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/*
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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_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 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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st_gdata->rx_chnl = 0;
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return 0;
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}
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/*
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* st_wakeup_ack - 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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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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/*
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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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/*
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* st_int_recv - ST's internal receive function.
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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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* This can receive various types of packets,
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* HCI-Events, ACL, SCO, 4 types of HCI-LL PM packets
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* CH-8 packets from FM, CH-9 packets from GPS cores.
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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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char *ptr;
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struct st_proto_s *proto;
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unsigned short payload_len = 0;
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int len = 0;
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unsigned char type = 0;
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unsigned char *plen;
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struct st_data_s *st_gdata = (struct st_data_s *)disc_data;
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unsigned long flags;
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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_debug("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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spin_lock_irqsave(&st_gdata->lock, flags);
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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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skb_put_data(st_gdata->rx_skb, 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_W4_DATA:
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pr_debug("Complete pkt received");
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/*
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* Ask ST CORE to forward
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* the packet to protocol driver
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*/
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st_send_frame(st_gdata->rx_chnl, 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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continue;
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/* parse the header to know details */
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case ST_W4_HEADER:
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proto = st_gdata->list[st_gdata->rx_chnl];
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plen =
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&st_gdata->rx_skb->data
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[proto->offset_len_in_hdr];
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pr_debug("plen pointing to %x\n", *plen);
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if (proto->len_size == 1) /* 1 byte len field */
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payload_len = *(unsigned char *)plen;
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else if (proto->len_size == 2)
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payload_len =
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__le16_to_cpu(*(unsigned short *)plen);
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else
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pr_info("%s: invalid length "
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"for id %d\n",
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__func__, proto->chnl_id);
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st_check_data_len(st_gdata, proto->chnl_id,
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payload_len);
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pr_debug("off %d, pay len %d\n",
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proto->offset_len_in_hdr, payload_len);
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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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/*
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* Check first byte of packet and identify module
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* owner (BT/FM/GPS)
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*/
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switch (*ptr) {
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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_debug("PM packet");
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/*
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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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/*
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* if WAKEUP_IND collides copy from waitq to txq
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* and assume chip awake
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*/
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spin_unlock_irqrestore(&st_gdata->lock, flags);
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if (st_ll_getstate(st_gdata) == ST_LL_AWAKE)
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st_wakeup_ack(st_gdata, LL_WAKE_UP_ACK);
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spin_lock_irqsave(&st_gdata->lock, flags);
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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_debug("PM packet");
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spin_unlock_irqrestore(&st_gdata->lock, flags);
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/* wake up ack received */
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st_wakeup_ack(st_gdata, *ptr);
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spin_lock_irqsave(&st_gdata->lock, flags);
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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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type = *ptr;
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/*
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* Default case means non-HCILL packets,
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* possibilities are packets for:
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* (a) valid protocol - Supported Protocols within
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* the ST_MAX_CHANNELS.
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* (b) registered protocol - Checked by
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* "st_gdata->list[type] == NULL)" are supported
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* protocols only.
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* Rules out any invalid protocol and
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* unregistered protocols with channel ID < 16.
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*/
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if ((type >= ST_MAX_CHANNELS) ||
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(st_gdata->list[type] == NULL)) {
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pr_err("chip/interface misbehavior: "
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"dropping frame starting "
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"with 0x%02x\n", type);
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goto done;
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}
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st_gdata->rx_skb = alloc_skb(
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st_gdata->list[type]->max_frame_size,
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GFP_ATOMIC);
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if (st_gdata->rx_skb == NULL) {
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pr_err("out of memory: dropping\n");
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goto done;
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}
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skb_reserve(st_gdata->rx_skb,
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st_gdata->list[type]->reserve);
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/* next 2 required for BT only */
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st_gdata->rx_skb->cb[0] = type; /*pkt_type*/
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st_gdata->rx_skb->cb[1] = 0; /*incoming*/
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st_gdata->rx_chnl = *ptr;
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st_gdata->rx_state = ST_W4_HEADER;
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st_gdata->rx_count = st_gdata->list[type]->hdr_len;
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pr_debug("rx_count %ld\n", st_gdata->rx_count);
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}
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ptr++;
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count--;
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}
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done:
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spin_unlock_irqrestore(&st_gdata->lock, flags);
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pr_debug("done %s", __func__);
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return;
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}
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/*
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* st_int_dequeue - internal de-Q function.
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* If the previous data set was not written
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* completely, return that skb which has the pending data.
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* In normal cases, return top of txq.
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*/
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static 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_debug("%s", __func__);
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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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return skb_dequeue(&st_gdata->txq);
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}
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/*
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* st_int_enqueue - 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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* If the chip is asleep, then Q it onto waitq and
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* wakeup the chip.
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* txq and waitq needs protection since the other contexts
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* may be sending data, waking up chip.
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*/
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static 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_debug("%s", __func__);
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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_debug("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:
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pr_err("ST LL is illegal state(%ld),"
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"purging received skb.", st_ll_getstate(st_gdata));
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kfree_skb(skb);
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break;
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case ST_LL_ASLEEP:
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skb_queue_tail(&st_gdata->tx_waitq, skb);
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st_ll_wakeup(st_gdata);
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break;
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default:
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pr_err("ST LL is illegal state(%ld),"
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"purging received skb.", st_ll_getstate(st_gdata));
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kfree_skb(skb);
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break;
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}
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spin_unlock_irqrestore(&st_gdata->lock, flags);
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pr_debug("done %s", __func__);
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return;
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}
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/*
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* internal wakeup function
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* called from either
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* - TTY layer when write's finished
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* - st_write (in context of the protocol stack)
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*/
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static void work_fn_write_wakeup(struct work_struct *work)
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{
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struct st_data_s *st_gdata = container_of(work, struct st_data_s,
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work_write_wakeup);
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st_tx_wakeup((void *)st_gdata);
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}
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void st_tx_wakeup(struct st_data_s *st_data)
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{
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struct sk_buff *skb;
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unsigned long flags; /* for irq save flags */
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pr_debug("%s", __func__);
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/* check for sending & set flag sending here */
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if (test_and_set_bit(ST_TX_SENDING, &st_data->tx_state)) {
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pr_debug("ST already sending");
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/* keep sending */
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set_bit(ST_TX_WAKEUP, &st_data->tx_state);
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return;
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/* TX_WAKEUP will be checked in another
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* context
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*/
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}
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do { /* come back if st_tx_wakeup is set */
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/* woke-up to write */
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clear_bit(ST_TX_WAKEUP, &st_data->tx_state);
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while ((skb = st_int_dequeue(st_data))) {
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int len;
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spin_lock_irqsave(&st_data->lock, flags);
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/* enable wake-up from TTY */
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set_bit(TTY_DO_WRITE_WAKEUP, &st_data->tty->flags);
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len = st_int_write(st_data, skb->data, skb->len);
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skb_pull(skb, len);
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/* if skb->len = len as expected, skb->len=0 */
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if (skb->len) {
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/* would be the next skb to be sent */
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st_data->tx_skb = skb;
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spin_unlock_irqrestore(&st_data->lock, flags);
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break;
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}
|
|
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, void *buf)
|
|
{
|
|
seq_printf(buf, "[%d]\nBT=%c\nFM=%c\nGPS=%c\n",
|
|
st_gdata->protos_registered,
|
|
st_gdata->is_registered[0x04] == true ? 'R' : 'U',
|
|
st_gdata->is_registered[0x08] == true ? 'R' : 'U',
|
|
st_gdata->is_registered[0x09] == true ? 'R' : 'U');
|
|
}
|
|
|
|
/********************************************************************/
|
|
/*
|
|
* 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 = 0;
|
|
unsigned long flags = 0;
|
|
|
|
st_kim_ref(&st_gdata, 0);
|
|
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 -EINVAL;
|
|
}
|
|
|
|
if (new_proto->chnl_id >= ST_MAX_CHANNELS) {
|
|
pr_err("chnl_id %d not supported", new_proto->chnl_id);
|
|
return -EPROTONOSUPPORT;
|
|
}
|
|
|
|
if (st_gdata->is_registered[new_proto->chnl_id] == true) {
|
|
pr_err("chnl_id %d already registered", new_proto->chnl_id);
|
|
return -EALREADY;
|
|
}
|
|
|
|
/* 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->chnl_id);
|
|
/* fw download in progress */
|
|
|
|
add_channel_to_table(st_gdata, 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 -EINPROGRESS;
|
|
} else if (st_gdata->protos_registered == ST_EMPTY) {
|
|
pr_info(" chnl_id list empty :%d ", new_proto->chnl_id);
|
|
set_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state);
|
|
st_recv = st_kim_recv;
|
|
|
|
/* enable the ST LL - to set default chip state */
|
|
st_ll_enable(st_gdata);
|
|
|
|
/* release lock previously held - re-locked below */
|
|
spin_unlock_irqrestore(&st_gdata->lock, flags);
|
|
|
|
/*
|
|
* this may take a while to complete
|
|
* since it involves BT fw download
|
|
*/
|
|
err = st_kim_start(st_gdata->kim_data);
|
|
if (err != 0) {
|
|
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 ");
|
|
spin_lock_irqsave(&st_gdata->lock, flags);
|
|
st_reg_complete(st_gdata, err);
|
|
spin_unlock_irqrestore(&st_gdata->lock, flags);
|
|
clear_bit(ST_REG_PENDING, &st_gdata->st_state);
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock_irqsave(&st_gdata->lock, flags);
|
|
|
|
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_debug(" call reg complete callback ");
|
|
st_reg_complete(st_gdata, 0);
|
|
}
|
|
clear_bit(ST_REG_PENDING, &st_gdata->st_state);
|
|
|
|
/*
|
|
* check for already registered once more,
|
|
* since the above check is old
|
|
*/
|
|
if (st_gdata->is_registered[new_proto->chnl_id] == true) {
|
|
pr_err(" proto %d already registered ",
|
|
new_proto->chnl_id);
|
|
spin_unlock_irqrestore(&st_gdata->lock, flags);
|
|
return -EALREADY;
|
|
}
|
|
|
|
add_channel_to_table(st_gdata, 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 {
|
|
add_channel_to_table(st_gdata, 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;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(st_register);
|
|
|
|
/*
|
|
* to unregister a protocol -
|
|
* to be called from protocol stack driver
|
|
*/
|
|
long st_unregister(struct st_proto_s *proto)
|
|
{
|
|
long err = 0;
|
|
unsigned long flags = 0;
|
|
struct st_data_s *st_gdata;
|
|
|
|
pr_debug("%s: %d ", __func__, proto->chnl_id);
|
|
|
|
st_kim_ref(&st_gdata, 0);
|
|
if (!st_gdata || proto->chnl_id >= ST_MAX_CHANNELS) {
|
|
pr_err(" chnl_id %d not supported", proto->chnl_id);
|
|
return -EPROTONOSUPPORT;
|
|
}
|
|
|
|
spin_lock_irqsave(&st_gdata->lock, flags);
|
|
|
|
if (st_gdata->is_registered[proto->chnl_id] == false) {
|
|
pr_err(" chnl_id %d not registered", proto->chnl_id);
|
|
spin_unlock_irqrestore(&st_gdata->lock, flags);
|
|
return -EPROTONOSUPPORT;
|
|
}
|
|
|
|
if (st_gdata->protos_registered)
|
|
st_gdata->protos_registered--;
|
|
|
|
remove_channel_from_table(st_gdata, proto);
|
|
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 chnl_ids unregistered ");
|
|
|
|
/* stop traffic on tty */
|
|
if (st_gdata->tty) {
|
|
tty_ldisc_flush(st_gdata->tty);
|
|
stop_tty(st_gdata->tty);
|
|
}
|
|
|
|
/* all chnl_ids now unregistered */
|
|
st_kim_stop(st_gdata->kim_data);
|
|
/* 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;
|
|
long len;
|
|
|
|
st_kim_ref(&st_gdata, 0);
|
|
if (unlikely(skb == NULL || st_gdata == NULL
|
|
|| st_gdata->tty == NULL)) {
|
|
pr_err("data/tty unavailable to perform write");
|
|
return -EINVAL;
|
|
}
|
|
|
|
pr_debug("%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)
|
|
{
|
|
struct st_data_s *st_gdata;
|
|
pr_info("%s ", __func__);
|
|
|
|
st_kim_ref(&st_gdata, 0);
|
|
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(st_gdata->kim_data);
|
|
pr_debug("done %s", __func__);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void st_tty_close(struct tty_struct *tty)
|
|
{
|
|
unsigned char i;
|
|
unsigned long flags;
|
|
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_CHANNELS; i++) {
|
|
if (st_gdata->is_registered[i] == true)
|
|
pr_err("%d not un-registered", i);
|
|
st_gdata->list[i] = NULL;
|
|
st_gdata->is_registered[i] = false;
|
|
}
|
|
st_gdata->protos_registered = 0;
|
|
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->kim_data);
|
|
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_debug("%s: done ", __func__);
|
|
}
|
|
|
|
static void st_tty_receive(struct tty_struct *tty, const unsigned char *data,
|
|
const char *tty_flags, int count)
|
|
{
|
|
#ifdef VERBOSE
|
|
print_hex_dump(KERN_DEBUG, ">in>", DUMP_PREFIX_NONE,
|
|
16, 1, data, count, 0);
|
|
#endif
|
|
|
|
/*
|
|
* if fw download is in progress then route incoming data
|
|
* to KIM for validation
|
|
*/
|
|
st_recv(tty->disc_data, data, count);
|
|
pr_debug("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_debug("%s ", __func__);
|
|
/* don't do an wakeup for now */
|
|
clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
|
|
|
|
/*
|
|
* schedule the internal wakeup instead of calling directly to
|
|
* avoid lockup (port->lock needed in tty->ops->write is
|
|
* already taken here
|
|
*/
|
|
schedule_work(&st_gdata->work_write_wakeup);
|
|
}
|
|
|
|
static void st_tty_flush_buffer(struct tty_struct *tty)
|
|
{
|
|
struct st_data_s *st_gdata = tty->disc_data;
|
|
pr_debug("%s ", __func__);
|
|
|
|
kfree_skb(st_gdata->tx_skb);
|
|
st_gdata->tx_skb = NULL;
|
|
|
|
tty_driver_flush_buffer(tty);
|
|
return;
|
|
}
|
|
|
|
static struct tty_ldisc_ops st_ldisc_ops = {
|
|
.num = N_TI_WL,
|
|
.name = "n_st",
|
|
.open = st_tty_open,
|
|
.close = st_tty_close,
|
|
.receive_buf = st_tty_receive,
|
|
.write_wakeup = st_tty_wakeup,
|
|
.flush_buffer = st_tty_flush_buffer,
|
|
.owner = THIS_MODULE
|
|
};
|
|
|
|
/********************************************************************/
|
|
int st_core_init(struct st_data_s **core_data)
|
|
{
|
|
struct st_data_s *st_gdata;
|
|
long err;
|
|
|
|
err = tty_register_ldisc(&st_ldisc_ops);
|
|
if (err) {
|
|
pr_err("error registering %d line discipline %ld",
|
|
N_TI_WL, err);
|
|
return err;
|
|
}
|
|
pr_debug("registered n_shared line discipline");
|
|
|
|
st_gdata = kzalloc(sizeof(struct st_data_s), GFP_KERNEL);
|
|
if (!st_gdata) {
|
|
pr_err("memory allocation failed");
|
|
err = -ENOMEM;
|
|
goto err_unreg_ldisc;
|
|
}
|
|
|
|
/* 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);
|
|
|
|
err = st_ll_init(st_gdata);
|
|
if (err) {
|
|
pr_err("error during st_ll initialization(%ld)", err);
|
|
goto err_free_gdata;
|
|
}
|
|
|
|
INIT_WORK(&st_gdata->work_write_wakeup, work_fn_write_wakeup);
|
|
|
|
*core_data = st_gdata;
|
|
return 0;
|
|
err_free_gdata:
|
|
kfree(st_gdata);
|
|
err_unreg_ldisc:
|
|
tty_unregister_ldisc(&st_ldisc_ops);
|
|
return err;
|
|
}
|
|
|
|
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 (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 */
|
|
tty_unregister_ldisc(&st_ldisc_ops);
|
|
/* free the global data pointer */
|
|
kfree(st_gdata);
|
|
}
|
|
}
|