diff options
Diffstat (limited to 'drivers/misc/ti-st/st_core.c')
| -rw-r--r-- | drivers/misc/ti-st/st_core.c | 918 |
1 files changed, 0 insertions, 918 deletions
diff --git a/drivers/misc/ti-st/st_core.c b/drivers/misc/ti-st/st_core.c deleted file mode 100644 index b878431553ab..000000000000 --- a/drivers/misc/ti-st/st_core.c +++ /dev/null @@ -1,918 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Shared Transport Line discipline driver Core - * This hooks up ST KIM driver and ST LL driver - * Copyright (C) 2009-2010 Texas Instruments - * Author: Pavan Savoy <pavan_savoy@ti.com> - */ - -#define pr_fmt(fmt) "(stc): " fmt -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/tty.h> - -#include <linux/seq_file.h> -#include <linux/skbuff.h> - -#include <linux/ti_wilink_st.h> -#include <linux/netdevice.h> - -/* - * function pointer pointing to either, - * st_kim_recv during registration to receive fw download responses - * st_int_recv after registration to receive proto stack responses - */ -static void (*st_recv)(void *disc_data, const u8 *ptr, size_t count); - -/********************************************************************/ -static void add_channel_to_table(struct st_data_s *st_gdata, - struct st_proto_s *new_proto) -{ - pr_info("%s: id %d\n", __func__, new_proto->chnl_id); - /* list now has the channel id as index itself */ - st_gdata->list[new_proto->chnl_id] = new_proto; - st_gdata->is_registered[new_proto->chnl_id] = true; -} - -static void remove_channel_from_table(struct st_data_s *st_gdata, - struct st_proto_s *proto) -{ - pr_info("%s: id %d\n", __func__, proto->chnl_id); -/* st_gdata->list[proto->chnl_id] = NULL; */ - st_gdata->is_registered[proto->chnl_id] = false; -} - -/* - * called from KIM during firmware download. - * - * This is a wrapper function to tty->ops->write_room. - * It returns number of free space available in - * uart tx buffer. - */ -int st_get_uart_wr_room(struct st_data_s *st_gdata) -{ - if (unlikely(st_gdata == NULL || st_gdata->tty == NULL)) { - pr_err("tty unavailable to perform write"); - return -1; - } - - return tty_write_room(st_gdata->tty); -} - -/* - * can be called in from - * -- KIM (during fw download) - * -- ST Core (during st_write) - * - * This is the internal write function - a wrapper - * to tty->ops->write - */ -int st_int_write(struct st_data_s *st_gdata, - const unsigned char *data, int count) -{ - struct tty_struct *tty; - if (unlikely(st_gdata == NULL || st_gdata->tty == NULL)) { - pr_err("tty unavailable to perform write"); - return -EINVAL; - } - tty = st_gdata->tty; -#ifdef VERBOSE - print_hex_dump(KERN_DEBUG, "<out<", DUMP_PREFIX_NONE, - 16, 1, data, count, 0); -#endif - return tty->ops->write(tty, data, count); - -} - -/* - * push the skb received to relevant - * protocol stacks - */ -static void st_send_frame(unsigned char chnl_id, struct st_data_s *st_gdata) -{ - pr_debug(" %s(prot:%d) ", __func__, chnl_id); - - if (unlikely - (st_gdata == NULL || st_gdata->rx_skb == NULL - || st_gdata->is_registered[chnl_id] == false)) { - pr_err("chnl_id %d not registered, no data to send?", - chnl_id); - kfree_skb(st_gdata->rx_skb); - return; - } - /* - * this cannot fail - * this shouldn't take long - * - should be just skb_queue_tail for the - * protocol stack driver - */ - if (likely(st_gdata->list[chnl_id]->recv != NULL)) { - if (unlikely - (st_gdata->list[chnl_id]->recv - (st_gdata->list[chnl_id]->priv_data, st_gdata->rx_skb) - != 0)) { - pr_err(" proto stack %d's ->recv failed", chnl_id); - kfree_skb(st_gdata->rx_skb); - return; - } - } else { - pr_err(" proto stack %d's ->recv null", chnl_id); - kfree_skb(st_gdata->rx_skb); - } - return; -} - -/* - * st_reg_complete - to call registration complete callbacks - * of all protocol stack drivers - * This function is being called with spin lock held, protocol drivers are - * only expected to complete their waits and do nothing more than that. - */ -static void st_reg_complete(struct st_data_s *st_gdata, int err) -{ - unsigned char i = 0; - pr_info(" %s ", __func__); - for (i = 0; i < ST_MAX_CHANNELS; i++) { - if (likely(st_gdata != NULL && - st_gdata->is_registered[i] == true && - st_gdata->list[i]->reg_complete_cb != NULL)) { - st_gdata->list[i]->reg_complete_cb - (st_gdata->list[i]->priv_data, err); - pr_info("protocol %d's cb sent %d\n", i, err); - if (err) { /* cleanup registered protocol */ - st_gdata->is_registered[i] = false; - if (st_gdata->protos_registered) - st_gdata->protos_registered--; - } - } - } -} - -static inline int st_check_data_len(struct st_data_s *st_gdata, - unsigned char chnl_id, int len) -{ - int room = skb_tailroom(st_gdata->rx_skb); - - pr_debug("len %d room %d", len, room); - - if (!len) { - /* - * Received packet has only packet header and - * has zero length payload. So, ask ST CORE to - * forward the packet to protocol driver (BT/FM/GPS) - */ - st_send_frame(chnl_id, st_gdata); - - } else if (len > room) { - /* - * Received packet's payload length is larger. - * We can't accommodate it in created skb. - */ - pr_err("Data length is too large len %d room %d", len, - room); - kfree_skb(st_gdata->rx_skb); - } else { - /* - * Packet header has non-zero payload length and - * we have enough space in created skb. Lets read - * payload data */ - st_gdata->rx_state = ST_W4_DATA; - st_gdata->rx_count = len; - return len; - } - - /* Change ST state to continue to process next packet */ - st_gdata->rx_state = ST_W4_PACKET_TYPE; - st_gdata->rx_skb = NULL; - st_gdata->rx_count = 0; - st_gdata->rx_chnl = 0; - - return 0; -} - -/* - * st_wakeup_ack - internal function for action when wake-up ack - * received - */ -static inline void st_wakeup_ack(struct st_data_s *st_gdata, - unsigned char cmd) -{ - struct sk_buff *waiting_skb; - unsigned long flags = 0; - - spin_lock_irqsave(&st_gdata->lock, flags); - /* - * de-Q from waitQ and Q in txQ now that the - * chip is awake - */ - while ((waiting_skb = skb_dequeue(&st_gdata->tx_waitq))) - skb_queue_tail(&st_gdata->txq, waiting_skb); - - /* state forwarded to ST LL */ - st_ll_sleep_state(st_gdata, (unsigned long)cmd); - spin_unlock_irqrestore(&st_gdata->lock, flags); - - /* wake up to send the recently copied skbs from waitQ */ - st_tx_wakeup(st_gdata); -} - -/* - * st_int_recv - ST's internal receive function. - * Decodes received RAW data and forwards to corresponding - * client drivers (Bluetooth,FM,GPS..etc). - * This can receive various types of packets, - * HCI-Events, ACL, SCO, 4 types of HCI-LL PM packets - * CH-8 packets from FM, CH-9 packets from GPS cores. - */ -static void st_int_recv(void *disc_data, const u8 *ptr, size_t count) -{ - struct st_proto_s *proto; - unsigned short payload_len = 0; - int len = 0; - unsigned char type = 0; - unsigned char *plen; - struct st_data_s *st_gdata = (struct st_data_s *)disc_data; - unsigned long flags; - - if (st_gdata == NULL) { - pr_err(" received null from TTY "); - return; - } - - pr_debug("count %zu rx_state %ld" - "rx_count %ld", count, st_gdata->rx_state, - st_gdata->rx_count); - - spin_lock_irqsave(&st_gdata->lock, flags); - /* Decode received bytes here */ - while (count) { - if (st_gdata->rx_count) { - len = min_t(unsigned int, st_gdata->rx_count, count); - skb_put_data(st_gdata->rx_skb, ptr, len); - st_gdata->rx_count -= len; - count -= len; - ptr += len; - - if (st_gdata->rx_count) - continue; - - /* Check ST RX state machine , where are we? */ - switch (st_gdata->rx_state) { - /* Waiting for complete packet ? */ - case ST_W4_DATA: - pr_debug("Complete pkt received"); - /* - * Ask ST CORE to forward - * the packet to protocol driver - */ - st_send_frame(st_gdata->rx_chnl, st_gdata); - - st_gdata->rx_state = ST_W4_PACKET_TYPE; - st_gdata->rx_skb = NULL; - continue; - /* parse the header to know details */ - case ST_W4_HEADER: - proto = st_gdata->list[st_gdata->rx_chnl]; - plen = - &st_gdata->rx_skb->data - [proto->offset_len_in_hdr]; - pr_debug("plen pointing to %x\n", *plen); - if (proto->len_size == 1) /* 1 byte len field */ - payload_len = *(unsigned char *)plen; - else if (proto->len_size == 2) - payload_len = - __le16_to_cpu(*(unsigned short *)plen); - else - pr_info("%s: invalid length " - "for id %d\n", - __func__, proto->chnl_id); - st_check_data_len(st_gdata, proto->chnl_id, - payload_len); - pr_debug("off %d, pay len %d\n", - proto->offset_len_in_hdr, payload_len); - continue; - } /* end of switch rx_state */ - } - - /* end of if rx_count */ - - /* - * Check first byte of packet and identify module - * owner (BT/FM/GPS) - */ - switch (*ptr) { - case LL_SLEEP_IND: - case LL_SLEEP_ACK: - case LL_WAKE_UP_IND: - pr_debug("PM packet"); - /* - * this takes appropriate action based on - * sleep state received -- - */ - st_ll_sleep_state(st_gdata, *ptr); - /* - * if WAKEUP_IND collides copy from waitq to txq - * and assume chip awake - */ - spin_unlock_irqrestore(&st_gdata->lock, flags); - if (st_ll_getstate(st_gdata) == ST_LL_AWAKE) - st_wakeup_ack(st_gdata, LL_WAKE_UP_ACK); - spin_lock_irqsave(&st_gdata->lock, flags); - - ptr++; - count--; - continue; - case LL_WAKE_UP_ACK: - pr_debug("PM packet"); - - spin_unlock_irqrestore(&st_gdata->lock, flags); - /* wake up ack received */ - st_wakeup_ack(st_gdata, *ptr); - spin_lock_irqsave(&st_gdata->lock, flags); - - ptr++; - count--; - continue; - /* Unknown packet? */ - default: - type = *ptr; - - /* - * Default case means non-HCILL packets, - * possibilities are packets for: - * (a) valid protocol - Supported Protocols within - * the ST_MAX_CHANNELS. - * (b) registered protocol - Checked by - * "st_gdata->list[type] == NULL)" are supported - * protocols only. - * Rules out any invalid protocol and - * unregistered protocols with channel ID < 16. - */ - - if ((type >= ST_MAX_CHANNELS) || - (st_gdata->list[type] == NULL)) { - pr_err("chip/interface misbehavior: " - "dropping frame starting " - "with 0x%02x\n", type); - goto done; - } - - st_gdata->rx_skb = alloc_skb( - st_gdata->list[type]->max_frame_size, - GFP_ATOMIC); - if (st_gdata->rx_skb == NULL) { - pr_err("out of memory: dropping\n"); - goto done; - } - - skb_reserve(st_gdata->rx_skb, - st_gdata->list[type]->reserve); - /* next 2 required for BT only */ - st_gdata->rx_skb->cb[0] = type; /*pkt_type*/ - st_gdata->rx_skb->cb[1] = 0; /*incoming*/ - st_gdata->rx_chnl = *ptr; - st_gdata->rx_state = ST_W4_HEADER; - st_gdata->rx_count = st_gdata->list[type]->hdr_len; - pr_debug("rx_count %ld\n", st_gdata->rx_count); - } - ptr++; - count--; - } -done: - spin_unlock_irqrestore(&st_gdata->lock, flags); - pr_debug("done %s", __func__); - return; -} - -/* - * st_int_dequeue - internal de-Q function. - * If the previous data set was not written - * completely, return that skb which has the pending data. - * In normal cases, return top of txq. - */ -static struct sk_buff *st_int_dequeue(struct st_data_s *st_gdata) -{ - struct sk_buff *returning_skb; - - pr_debug("%s", __func__); - if (st_gdata->tx_skb != NULL) { - returning_skb = st_gdata->tx_skb; - st_gdata->tx_skb = NULL; - return returning_skb; - } - return skb_dequeue(&st_gdata->txq); -} - -/* - * st_int_enqueue - internal Q-ing function. - * Will either Q the skb to txq or the tx_waitq - * depending on the ST LL state. - * If the chip is asleep, then Q it onto waitq and - * wakeup the chip. - * txq and waitq needs protection since the other contexts - * may be sending data, waking up chip. - */ -static void st_int_enqueue(struct st_data_s *st_gdata, struct sk_buff *skb) -{ - unsigned long flags = 0; - - pr_debug("%s", __func__); - spin_lock_irqsave(&st_gdata->lock, flags); - - switch (st_ll_getstate(st_gdata)) { - case ST_LL_AWAKE: - pr_debug("ST LL is AWAKE, sending normally"); - skb_queue_tail(&st_gdata->txq, skb); - break; - case ST_LL_ASLEEP_TO_AWAKE: - skb_queue_tail(&st_gdata->tx_waitq, skb); - break; - case ST_LL_AWAKE_TO_ASLEEP: - pr_err("ST LL is illegal state(%ld)," - "purging received skb.", st_ll_getstate(st_gdata)); - dev_kfree_skb_irq(skb); - break; - case ST_LL_ASLEEP: - skb_queue_tail(&st_gdata->tx_waitq, skb); - st_ll_wakeup(st_gdata); - break; - default: - pr_err("ST LL is illegal state(%ld)," - "purging received skb.", st_ll_getstate(st_gdata)); - dev_kfree_skb_irq(skb); - break; - } - - spin_unlock_irqrestore(&st_gdata->lock, flags); - pr_debug("done %s", __func__); - return; -} - -/* - * internal wakeup function - * called from either - * - TTY layer when write's finished - * - st_write (in context of the protocol stack) - */ -static void work_fn_write_wakeup(struct work_struct *work) -{ - struct st_data_s *st_gdata = container_of(work, struct st_data_s, - work_write_wakeup); - - st_tx_wakeup((void *)st_gdata); -} -void st_tx_wakeup(struct st_data_s *st_data) -{ - struct sk_buff *skb; - unsigned long flags; /* for irq save flags */ - pr_debug("%s", __func__); - /* check for sending & set flag sending here */ - 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); - return; - /* TX_WAKEUP will be checked in another - * context - */ - } - do { /* come back if st_tx_wakeup is set */ - /* woke-up to write */ - clear_bit(ST_TX_WAKEUP, &st_data->tx_state); - while ((skb = st_int_dequeue(st_data))) { - int len; - spin_lock_irqsave(&st_data->lock, flags); - /* enable wake-up from TTY */ - set_bit(TTY_DO_WRITE_WAKEUP, &st_data->tty->flags); - len = st_int_write(st_data, skb->data, skb->len); - skb_pull(skb, len); - /* if skb->len = len as expected, skb->len=0 */ - if (skb->len) { - /* would be the next skb to be sent */ - st_data->tx_skb = skb; - spin_unlock_irqrestore(&st_data->lock, flags); - break; - } - dev_kfree_skb_irq(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 u8 *data, - const u8 *tty_flags, size_t 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); - } -} |