diff options
Diffstat (limited to 'drivers/staging/ti-st/st_core.c')
| -rw-r--r-- | drivers/staging/ti-st/st_core.c | 54 |
1 files changed, 28 insertions, 26 deletions
diff --git a/drivers/staging/ti-st/st_core.c b/drivers/staging/ti-st/st_core.c index 7806843..b20ab73 100644 --- a/drivers/staging/ti-st/st_core.c +++ b/drivers/staging/ti-st/st_core.c @@ -72,6 +72,7 @@ bool is_protocol_list_empty(void) return ST_EMPTY; } #endif + /* can be called in from * -- KIM (during fw download) * -- ST Core (during st_write) @@ -131,7 +132,8 @@ void st_send_frame(enum proto_type protoid, struct st_data_s *st_gdata) return; } -/* +/** + * st_reg_complete - * to call registration complete callbacks * of all protocol stack drivers */ @@ -185,8 +187,9 @@ static inline int st_check_data_len(struct st_data_s *st_gdata, return 0; } -/* internal function for action when wake-up ack - * received +/** + * 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) @@ -209,9 +212,13 @@ static inline void st_wakeup_ack(struct st_data_s *st_gdata, st_tx_wakeup(st_gdata); } -/* Decodes received RAW data and forwards to corresponding - * client drivers (Bluetooth,FM,GPS..etc). - * +/** + * 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. */ void st_int_recv(void *disc_data, const unsigned char *data, long count) @@ -438,41 +445,39 @@ void st_int_recv(void *disc_data, return; } -/* internal de-Q function - * -- return previous in-completely written skb - * or return the skb in the txQ +/** + * 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. */ struct sk_buff *st_int_dequeue(struct st_data_s *st_gdata) { struct sk_buff *returning_skb; pr_debug("%s", __func__); - /* if the previous skb wasn't written completely - */ if (st_gdata->tx_skb != NULL) { returning_skb = st_gdata->tx_skb; st_gdata->tx_skb = NULL; return returning_skb; } - - /* de-Q from the txQ always if previous write is complete */ return skb_dequeue(&st_gdata->txq); } -/* internal Q-ing function - * will either Q the skb to txq or the tx_waitq - * depending on the ST LL state - * - * lock the whole func - since ll_getstate and Q-ing should happen - * in one-shot +/** + * 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. */ void st_int_enqueue(struct st_data_s *st_gdata, struct sk_buff *skb) { unsigned long flags = 0; pr_debug("%s", __func__); - /* this function can be invoked in more then one context. - * so have a lock */ spin_lock_irqsave(&st_gdata->lock, flags); switch (st_ll_getstate(st_gdata)) { @@ -483,16 +488,12 @@ void st_int_enqueue(struct st_data_s *st_gdata, struct sk_buff *skb) case ST_LL_ASLEEP_TO_AWAKE: skb_queue_tail(&st_gdata->tx_waitq, skb); break; - case ST_LL_AWAKE_TO_ASLEEP: /* host cannot be in this state */ + case ST_LL_AWAKE_TO_ASLEEP: pr_err("ST LL is illegal state(%ld)," "purging received skb.", st_ll_getstate(st_gdata)); kfree_skb(skb); break; - case ST_LL_ASLEEP: - /* call a function of ST LL to put data - * in tx_waitQ and wake_ind in txQ - */ skb_queue_tail(&st_gdata->tx_waitq, skb); st_ll_wakeup(st_gdata); break; @@ -502,6 +503,7 @@ void st_int_enqueue(struct st_data_s *st_gdata, struct sk_buff *skb) kfree_skb(skb); break; } + spin_unlock_irqrestore(&st_gdata->lock, flags); pr_debug("done %s", __func__); return; |
