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923 lines
24 KiB
923 lines
24 KiB
// 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 <[email protected]> |
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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/tty.h> |
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|
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#include <linux/seq_file.h> |
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#include <linux/skbuff.h> |
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|
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#include <linux/ti_wilink_st.h> |
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|
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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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/********************************************************************/ |
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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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|
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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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/* |
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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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|
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return tty_write_room(st_gdata->tty); |
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} |
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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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|
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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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|
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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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/* |
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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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|
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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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|
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pr_debug("len %d room %d", len, room); |
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|
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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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|
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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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|
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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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|
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return 0; |
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} |
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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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|
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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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|
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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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|
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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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/* |
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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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|
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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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|
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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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|
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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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|
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if (st_gdata->rx_count) |
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continue; |
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|
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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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|
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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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|
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/* end of if rx_count */ |
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|
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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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|
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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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|
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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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|
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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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/* |
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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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|
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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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|
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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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|
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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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|
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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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* 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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void st_tx_wakeup(struct st_data_s *st_data) |
|
{ |
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struct sk_buff *skb; |
|
unsigned long flags; /* for irq save flags */ |
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pr_debug("%s", __func__); |
|
/* check for sending & set flag sending here */ |
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if (test_and_set_bit(ST_TX_SENDING, &st_data->tx_state)) { |
|
pr_debug("ST already sending"); |
|
/* keep sending */ |
|
set_bit(ST_TX_WAKEUP, &st_data->tx_state); |
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return; |
|
/* TX_WAKEUP will be checked in another |
|
* context |
|
*/ |
|
} |
|
do { /* come back if st_tx_wakeup is set */ |
|
/* woke-up to write */ |
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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 */ |
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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); |
|
skb_pull(skb, len); |
|
/* if skb->len = len as expected, skb->len=0 */ |
|
if (skb->len) { |
|
/* 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); |
|
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, 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', |
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st_gdata->is_registered[0x08] == true ? 'R' : 'U', |
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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); |
|
} |
|
}
|
|
|