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Staging: ti-st: cleanup code comments
cleanup the code commenting in the headers/structures, also cleanup few inline commenting in the function Signed-off-by: Pavan Savoy <pavan_savoy@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Pavan Savoy
Greg Kroah-Hartman
parent
e6d9e64e36
commit
36b5aee46b
@ -24,24 +24,24 @@
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#define ST_H
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#include <linux/skbuff.h>
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/*
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* st.h
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*/
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/* TODO:
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* Move the following to tty.h upon acceptance
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*/
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#define N_TI_WL 20 /* Ldisc for TI's WL BT, FM, GPS combo chips */
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/* some gpios have active high, others like fm have
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* active low
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/**
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* enum kim_gpio_state - Few protocols such as FM have ACTIVE LOW
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* gpio states for their chip/core enable gpios
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*/
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enum kim_gpio_state {
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KIM_GPIO_INACTIVE,
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KIM_GPIO_ACTIVE,
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};
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/*
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* the list of protocols on chip
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/**
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* enum proto-type - The protocol on WiLink chips which share a
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* common physical interface like UART.
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*/
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enum proto_type {
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ST_BT,
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@ -50,28 +50,26 @@ enum proto_type {
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ST_MAX,
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};
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/* per protocol structure
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* for BT/FM and GPS
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/**
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* struct st_proto_s - Per Protocol structure from BT/FM/GPS to ST
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* @type: type of the protocol being registered among the
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* available proto_type(BT, FM, GPS the protocol which share TTY).
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* @recv: the receiver callback pointing to a function in the
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* protocol drivers called by the ST driver upon receiving
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* relevant data.
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* @match_packet: reserved for future use, to make ST more generic
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* @reg_complete_cb: callback handler pointing to a function in protocol
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* handler called by ST when the pending registrations are complete.
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* The registrations are marked pending, in situations when fw
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* download is in progress.
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* @write: pointer to function in ST provided to protocol drivers from ST,
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* to be made use when protocol drivers have data to send to TTY.
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*/
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struct st_proto_s {
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enum proto_type type;
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/*
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* to be called by ST when data arrives
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*/
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long (*recv) (struct sk_buff *);
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/*
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* for future use, logic now to be in ST
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*/
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unsigned char (*match_packet) (const unsigned char *data);
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/*
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* subsequent registration return PENDING,
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* signalled complete by this callback function
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*/
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void (*reg_complete_cb) (char data);
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/*
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* write function, sent in as NULL and to be returned to
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* protocol drivers
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*/
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long (*write) (struct sk_buff *skb);
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};
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@ -72,6 +72,7 @@ bool is_protocol_list_empty(void)
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return ST_EMPTY;
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}
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#endif
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/* can be called in from
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* -- KIM (during fw download)
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* -- ST Core (during st_write)
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@ -131,7 +132,8 @@ void st_send_frame(enum proto_type protoid, struct st_data_s *st_gdata)
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return;
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}
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/*
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/**
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* st_reg_complete -
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* to call registration complete callbacks
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* of all protocol stack drivers
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*/
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@ -185,8 +187,9 @@ static inline int st_check_data_len(struct st_data_s *st_gdata,
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return 0;
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}
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/* internal function for action when wake-up ack
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* received
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/**
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* 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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@ -209,9 +212,13 @@ static inline void st_wakeup_ack(struct st_data_s *st_gdata,
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st_tx_wakeup(st_gdata);
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}
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/* Decodes received RAW data and forwards to corresponding
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* client drivers (Bluetooth,FM,GPS..etc).
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*
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/**
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* 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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@ -438,41 +445,39 @@ void st_int_recv(void *disc_data,
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return;
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}
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/* internal de-Q function
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* -- return previous in-completely written skb
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* or return the skb in the txQ
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/**
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* 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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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 the previous skb wasn't written completely
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*/
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if (st_gdata->tx_skb != NULL) {
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returning_skb = st_gdata->tx_skb;
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st_gdata->tx_skb = NULL;
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return returning_skb;
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}
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/* de-Q from the txQ always if previous write is complete */
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return skb_dequeue(&st_gdata->txq);
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}
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/* internal Q-ing function
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* will either Q the skb to txq or the tx_waitq
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* depending on the ST LL state
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*
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* lock the whole func - since ll_getstate and Q-ing should happen
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* in one-shot
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/**
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* 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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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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/* this function can be invoked in more then one context.
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* so have a lock */
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spin_lock_irqsave(&st_gdata->lock, flags);
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switch (st_ll_getstate(st_gdata)) {
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@ -483,16 +488,12 @@ void st_int_enqueue(struct st_data_s *st_gdata, struct sk_buff *skb)
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case ST_LL_ASLEEP_TO_AWAKE:
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skb_queue_tail(&st_gdata->tx_waitq, skb);
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break;
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case ST_LL_AWAKE_TO_ASLEEP: /* host cannot be in this state */
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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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/* call a function of ST LL to put data
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* in tx_waitQ and wake_ind in txQ
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*/
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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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@ -502,6 +503,7 @@ void st_int_enqueue(struct st_data_s *st_gdata, struct sk_buff *skb)
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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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@ -36,59 +36,87 @@
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#define ST_REG_PENDING 3
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#define ST_WAITING_FOR_RESP 4
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/*
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* local data required for ST/KIM/ST-HCI-LL
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/**
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* struct st_data_s - ST core internal structure
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* @st_state: different states of ST like initializing, registration
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* in progress, this is mainly used to return relevant err codes
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* when protocol drivers are registering. It is also used to track
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* the recv function, as in during fw download only HCI events
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* can occur , where as during other times other events CH8, CH9
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* can occur.
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* @tty: tty provided by the TTY core for line disciplines.
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* @ldisc_ops: the procedures that this line discipline registers with TTY.
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* @tx_skb: If for some reason the tty's write returns lesser bytes written
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* then to maintain the rest of data to be written on next instance.
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* This needs to be protected, hence the lock inside wakeup func.
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* @tx_state: if the data is being written onto the TTY and protocol driver
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* wants to send more, queue up data and mark that there is
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* more data to send.
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* @list: the list of protocols registered, only MAX can exist, one protocol
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* can register only once.
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* @rx_state: states to be maintained inside st's tty receive
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* @rx_count: count to be maintained inside st's tty receieve
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* @rx_skb: the skb where all data for a protocol gets accumulated,
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* since tty might not call receive when a complete event packet
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* is received, the states, count and the skb needs to be maintained.
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* @txq: the list of skbs which needs to be sent onto the TTY.
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* @tx_waitq: if the chip is not in AWAKE state, the skbs needs to be queued
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* up in here, PM(WAKEUP_IND) data needs to be sent and then the skbs
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* from waitq can be moved onto the txq.
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* Needs locking too.
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* @lock: the lock to protect skbs, queues, and ST states.
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* @protos_registered: count of the protocols registered, also when 0 the
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* chip enable gpio can be toggled, and when it changes to 1 the fw
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* needs to be downloaded to initialize chip side ST.
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* @ll_state: the various PM states the chip can be, the states are notified
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* to us, when the chip sends relevant PM packets(SLEEP_IND, WAKE_IND).
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* @kim_data: reference to the parent encapsulating structure.
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*
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*/
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struct st_data_s {
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unsigned long st_state;
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/*
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* an instance of tty_struct & ldisc ops to move around
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*/
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struct tty_struct *tty;
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struct tty_ldisc_ops *ldisc_ops;
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/*
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* the tx skb -
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* if the skb is already dequeued and the tty failed to write the same
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* maintain the skb to write in the next transaction
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*/
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struct sk_buff *tx_skb;
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#define ST_TX_SENDING 1
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#define ST_TX_WAKEUP 2
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unsigned long tx_state;
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/*
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* list of protocol registered
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*/
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struct st_proto_s *list[ST_MAX];
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/*
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* lock
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*/
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unsigned long rx_state;
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unsigned long rx_count;
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struct sk_buff *rx_skb;
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struct sk_buff_head txq, tx_waitq;
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spinlock_t lock; /* ST LL state lock */
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spinlock_t lock;
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unsigned char protos_registered;
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unsigned long ll_state; /* ST LL power state */
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/* device reference to kim data */
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unsigned long ll_state;
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void *kim_data;
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};
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/* point this to tty->driver->write or tty->ops->write
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/**
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* st_int_write -
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* point this to tty->driver->write or tty->ops->write
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* depending upon the kernel version
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*/
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int st_int_write(struct st_data_s*, const unsigned char*, int);
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/* internal write function, passed onto protocol drivers
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/**
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* st_write -
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* internal write function, passed onto protocol drivers
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* via the write function ptr of protocol struct
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*/
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long st_write(struct sk_buff *);
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/* function to be called from ST-LL
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*/
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/* function to be called from ST-LL */
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void st_ll_send_frame(enum proto_type, struct sk_buff *);
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/* internal wake up function */
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void st_tx_wakeup(struct st_data_s *st_data);
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/* init, exit entry funcs called from KIM */
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int st_core_init(struct st_data_s **);
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void st_core_exit(struct st_data_s *);
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/* ask for reference from KIM */
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void st_kim_ref(struct st_data_s **);
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#define GPS_STUB_TEST
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@ -104,10 +104,11 @@ const unsigned char *protocol_names[] = {
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/**********************************************************************/
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/* internal functions */
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/*
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* function to return whether the firmware response was proper
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* in case of error don't complete so that waiting for proper
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* response times out
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/**
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* validate_firmware_response -
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* function to return whether the firmware response was proper
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* in case of error don't complete so that waiting for proper
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* response times out
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*/
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void validate_firmware_response(struct kim_data_s *kim_gdata)
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{
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@ -158,10 +159,11 @@ static inline int kim_check_data_len(struct kim_data_s *kim_gdata, int len)
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return 0;
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}
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/* receive function called during firmware download
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* - firmware download responses on different UART drivers
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* have been observed to come in bursts of different
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* tty_receive and hence the logic
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/**
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* kim_int_recv - receive function called during firmware download
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* firmware download responses on different UART drivers
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* have been observed to come in bursts of different
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* tty_receive and hence the logic
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*/
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void kim_int_recv(struct kim_data_s *kim_gdata,
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const unsigned char *data, long count)
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@ -220,7 +222,7 @@ void kim_int_recv(struct kim_data_s *kim_gdata,
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ptr++;
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count--;
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continue;
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} /* end of switch *ptr */
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}
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ptr++;
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count--;
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kim_gdata->rx_skb =
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@ -230,9 +232,9 @@ void kim_int_recv(struct kim_data_s *kim_gdata,
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kim_gdata->rx_state = ST_W4_PACKET_TYPE;
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kim_gdata->rx_count = 0;
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return;
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} /* not necessary in this case */
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}
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bt_cb(kim_gdata->rx_skb)->pkt_type = type;
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} /* end of while count */
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}
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pr_info("done %s", __func__);
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return;
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}
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@ -278,8 +280,10 @@ static long read_local_version(struct kim_data_s *kim_gdata, char *bts_scr_name)
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return 0;
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}
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/* internal function which parses through the .bts firmware script file
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* intreprets SEND, DELAY actions only as of now
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/**
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* download_firmware -
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* internal function which parses through the .bts firmware
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* script file intreprets SEND, DELAY actions only as of now
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*/
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static long download_firmware(struct kim_data_s *kim_gdata)
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{
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@ -445,8 +449,13 @@ void st_kim_complete(void *kim_data)
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complete(&kim_gdata->ldisc_installed);
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}
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/* called from ST Core upon 1st registration
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*/
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/**
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* st_kim_start - called from ST Core upon 1st registration
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* This involves toggling the chip enable gpio, reading
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* the firmware version from chip, forming the fw file name
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* based on the chip version, requesting the fw, parsing it
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* and perform download(send/recv).
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*/
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long st_kim_start(void *kim_data)
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{
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long err = 0;
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@ -501,8 +510,10 @@ long st_kim_start(void *kim_data)
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return err;
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}
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/* called from ST Core, on the last un-registration
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*/
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/**
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* st_kim_stop - called from ST Core, on the last un-registration
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* toggle low the chip enable gpio
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*/
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long st_kim_stop(void *kim_data)
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{
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long err = 0;
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@ -607,6 +618,13 @@ static int kim_toggle_radio(void *data, bool blocked)
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return 0;
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}
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/**
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* st_kim_ref - reference the core's data
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* This references the per-ST platform device in the arch/xx/
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* board-xx.c file.
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* This would enable multiple such platform devices to exist
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* on a given platform
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*/
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void st_kim_ref(struct st_data_s **core_data)
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{
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struct platform_device *pdev;
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@ -43,13 +43,9 @@
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* since the self-test for chip takes a while
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*/
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#define POR_RETRY_COUNT 5
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/*
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* legacy rfkill support where-in 3 rfkill
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* devices are created for the 3 gpios
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* that ST has requested
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*/
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/* chip version storage
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/**
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* struct chip_version - save the chip version
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*/
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struct chip_version {
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unsigned short full;
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@ -58,18 +54,40 @@ struct chip_version {
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unsigned short maj_ver;
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};
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/*
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* header file for ST provided by KIM
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/**
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* struct kim_data_s - the KIM internal data, embedded as the
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* platform's drv data. One for each ST device in the system.
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* @uim_pid: KIM needs to communicate with UIM to request to install
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* the ldisc by opening UART when protocol drivers register.
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* @kim_pdev: the platform device added in one of the board-XX.c file
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* in arch/XX/ directory, 1 for each ST device.
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* @kim_rcvd: completion handler to notify when data was received,
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* mainly used during fw download, which involves multiple send/wait
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* for each of the HCI-VS commands.
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* @ldisc_installed: completion handler to notify that the UIM accepted
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* the request to install ldisc, notify from tty_open which suggests
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* the ldisc was properly installed.
|
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* @resp_buffer: data buffer for the .bts fw file name.
|
||||
* @fw_entry: firmware class struct to request/release the fw.
|
||||
* @gpios: the list of core/chip enable gpios for BT, FM and GPS cores.
|
||||
* @rx_state: the rx state for kim's receive func during fw download.
|
||||
* @rx_count: the rx count for the kim's receive func during fw download.
|
||||
* @rx_skb: all of fw data might not come at once, and hence data storage for
|
||||
* whole of the fw response, only HCI_EVENTs and hence diff from ST's
|
||||
* response.
|
||||
* @rfkill: rfkill data for each of the cores to be registered with rfkill.
|
||||
* @rf_protos: proto types of the data registered with rfkill sub-system.
|
||||
* @core_data: ST core's data, which mainly is the tty's disc_data
|
||||
* @version: chip version available via a sysfs entry.
|
||||
*
|
||||
*/
|
||||
struct kim_data_s {
|
||||
long uim_pid;
|
||||
struct platform_device *kim_pdev;
|
||||
struct completion kim_rcvd, ldisc_installed;
|
||||
/* MAX len of the .bts firmware script name */
|
||||
char resp_buffer[30];
|
||||
const struct firmware *fw_entry;
|
||||
long gpios[ST_MAX];
|
||||
/* used by kim_int_recv to validate fw response */
|
||||
unsigned long rx_state;
|
||||
unsigned long rx_count;
|
||||
struct sk_buff *rx_skb;
|
||||
@ -79,20 +97,17 @@ struct kim_data_s {
|
||||
struct chip_version version;
|
||||
};
|
||||
|
||||
/**
|
||||
* functions called when 1 of the protocol drivers gets
|
||||
* registered, these need to communicate with UIM to request
|
||||
* ldisc installed, read chip_version, download relevant fw
|
||||
*/
|
||||
long st_kim_start(void *);
|
||||
long st_kim_stop(void *);
|
||||
/*
|
||||
* called from st_tty_receive to authenticate fw_download
|
||||
*/
|
||||
|
||||
void st_kim_recv(void *, const unsigned char *, long count);
|
||||
|
||||
void st_kim_chip_toggle(enum proto_type, enum kim_gpio_state);
|
||||
|
||||
void st_kim_complete(void *);
|
||||
|
||||
/* function called from ST KIM to ST Core, to
|
||||
* list out the protocols registered
|
||||
*/
|
||||
void kim_st_list_protocols(struct st_data_s *, char *);
|
||||
|
||||
/*
|
||||
@ -105,9 +120,13 @@ void kim_st_list_protocols(struct st_data_s *, char *);
|
||||
#define ACTION_RUN_SCRIPT 5
|
||||
#define ACTION_REMARKS 6
|
||||
|
||||
/*
|
||||
* * BRF Firmware header
|
||||
* */
|
||||
/**
|
||||
* struct bts_header - the fw file is NOT binary which can
|
||||
* be sent onto TTY as is. The .bts is more a script
|
||||
* file which has different types of actions.
|
||||
* Each such action needs to be parsed by the KIM and
|
||||
* relevant procedure to be called.
|
||||
*/
|
||||
struct bts_header {
|
||||
uint32_t magic;
|
||||
uint32_t version;
|
||||
@ -115,9 +134,10 @@ struct bts_header {
|
||||
uint8_t actions[0];
|
||||
} __attribute__ ((packed));
|
||||
|
||||
/*
|
||||
* * BRF Actions structure
|
||||
* */
|
||||
/**
|
||||
* struct bts_action - Each .bts action has its own type of
|
||||
* data.
|
||||
*/
|
||||
struct bts_action {
|
||||
uint16_t type;
|
||||
uint16_t size;
|
||||
@ -143,8 +163,11 @@ struct bts_action_serial {
|
||||
uint32_t flow_control;
|
||||
} __attribute__ ((packed));
|
||||
|
||||
/* for identifying the change speed HCI VS
|
||||
* command
|
||||
/**
|
||||
* struct hci_command - the HCI-VS for intrepreting
|
||||
* the change baud rate of host-side UART, which
|
||||
* needs to be ignored, since UIM would do that
|
||||
* when it receives request from KIM for ldisc installation.
|
||||
*/
|
||||
struct hci_command {
|
||||
uint8_t prefix;
|
||||
|
||||
@ -41,6 +41,7 @@
|
||||
#define ST_LL_AWAKE_TO_ASLEEP 3
|
||||
#define ST_LL_INVALID 4
|
||||
|
||||
/* different PM notifications coming from chip */
|
||||
#define LL_SLEEP_IND 0x30
|
||||
#define LL_SLEEP_ACK 0x31
|
||||
#define LL_WAKE_UP_IND 0x32
|
||||
@ -50,13 +51,19 @@
|
||||
long st_ll_init(struct st_data_s *);
|
||||
long st_ll_deinit(struct st_data_s *);
|
||||
|
||||
/* enable/disable ST LL along with KIM start/stop
|
||||
/**
|
||||
* enable/disable ST LL along with KIM start/stop
|
||||
* called by ST Core
|
||||
*/
|
||||
void st_ll_enable(struct st_data_s *);
|
||||
void st_ll_disable(struct st_data_s *);
|
||||
|
||||
/**
|
||||
* various funcs used by ST core to set/get the various PM states
|
||||
* of the chip.
|
||||
*/
|
||||
unsigned long st_ll_getstate(struct st_data_s *);
|
||||
unsigned long st_ll_sleep_state(struct st_data_s *, unsigned char);
|
||||
void st_ll_wakeup(struct st_data_s *);
|
||||
|
||||
#endif /* ST_LL_H */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user