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Date: Tue, 13 Apr 2010 20:36:45 +0530 (IST)
From: Pavan Savoy <pavan_savoy@ti.com>
Reply-To: pavan_savoy@ti.com
Subject: Re: [PATCH] drivers:staging: sources for ST core
To: alan <alan@lxorguk.ukuu.org.uk>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <1270750619-19174-3-git-send-email-pavan_savoy@ti.com>
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Alan,

--- On Thu, 8/4/10, pavan_savoy@ti.com <pavan_savoy@ti.com> wrote:

> From: pavan_savoy@ti.com <pavan_savoy@ti.com>
> Subject: [PATCH] drivers:staging: sources for ST core
> To: gregkh@suse.de, alan@lxorguk.ukuu.org.uk
> Cc: linux-kernel@vger.kernel.org, npelly@google.com, pavan_savoy@yahoo.co.in, "Pavan Savoy" <pavan_savoy@ti.com>
> Date: Thursday, 8 April, 2010, 11:46 PM
> From: Pavan Savoy <pavan_savoy@ti.com>
> 
> Texas Instruments BT, FM and GPS combo chips/drivers
> make use of a single TTY to communicate with the chip.
> This module constitutes the core logic, TTY ldisc driver
> and the exported symbols for registering/unregistering of
> the protocol drivers such as BT/FM/GPS.
> 
> Signed-off-by: Pavan Savoy <pavan_savoy@ti.com>
> ---
>  drivers/staging/ti-st/st_core.c | 1062
> +++++++++++++++++++++++++++++++++++++++
>  drivers/staging/ti-st/st_core.h |   98
> ++++
>  2 files changed, 1160 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/staging/ti-st/st_core.c
>  create mode 100644 drivers/staging/ti-st/st_core.h
> 
> diff --git a/drivers/staging/ti-st/st_core.c
> b/drivers/staging/ti-st/st_core.c
> new file mode 100644
> index 0000000..4e93694
> --- /dev/null
> +++ b/drivers/staging/ti-st/st_core.c
> @@ -0,0 +1,1062 @@
> +/*
> + *  Shared Transport Line discipline driver Core
> + *    This hooks up ST KIM driver and ST LL
> driver
> + *  Copyright (C) 2009 Texas Instruments
> + *
> + *  This program is free software; you can
> redistribute it and/or modify
> + *  it under the terms of the GNU General Public
> License version 2 as
> + *  published by the Free Software Foundation.
> + *
> + *  This program is distributed in the hope that it
> will be useful,
> + *  but WITHOUT ANY WARRANTY; without even the
> implied warranty of
> + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR
> PURPOSE.  See the
> + *  GNU General Public License for more details.
> + *
> + *  You should have received a copy of the GNU
> General Public License
> + *  along with this program; if not, write to the
> Free Software
> + *  Foundation, Inc., 59 Temple Place, Suite 330,
> Boston, MA  02111-1307  USA
> + *
> + */
> +
> +#define pr_fmt(fmt)    "(stc): " fmt
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/tty.h>
> +
> +/* understand BT, FM and GPS for now */
> +#include <net/bluetooth/bluetooth.h>
> +#include <net/bluetooth/hci_core.h>
> +#include <net/bluetooth/hci.h>
> +#include "fm.h"
> +/*
> + * packet formats for fm and gps
> + * #include "gps.h"
> + */
> +#include "st_core.h"
> +#include "st_kim.h"
> +#include "st_ll.h"
> +#include "st.h"
> +
> +#ifdef DEBUG
> +/* strings to be used for rfkill entries and by
> + * ST Core to be used for sysfs debug entry
> + */
> +#define PROTO_ENTRY(type, name)    name
> +const unsigned char *protocol_strngs[] = {
> +    PROTO_ENTRY(ST_BT, "Bluetooth"),
> +    PROTO_ENTRY(ST_FM, "FM"),
> +    PROTO_ENTRY(ST_GPS, "GPS"),
> +};
> +#endif
> +/* 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
> + */
> +void (*st_recv) (void*, const unsigned char*, long);
> +
> +/********************************************************************/
> +#if 0
> +/* internal misc functions */
> +bool is_protocol_list_empty(void)
> +{
> +    unsigned char i = 0;
> +    pr_info(" %s ", __func__);
> +    for (i = 0; i < ST_MAX; i++) {
> +        if
> (st_gdata->list[i] != NULL)
> +           
> return ST_NOTEMPTY;
> +        /* not empty */
> +    }
> +    /* list empty */
> +    return ST_EMPTY;
> +}
> +#endif
> +/* 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)
> +{
> +#ifdef VERBOSE       
>     /* for debug */
> +    int i;
> +#endif
> +    struct tty_struct *tty;
> +    if (unlikely(st_gdata == NULL ||
> st_gdata->tty == NULL)) {
> +        pr_err("tty
> unavailable to perform write");
> +        return
> ST_ERR_FAILURE;
> +    }
> +    tty = st_gdata->tty;
> +#ifdef VERBOSE
> +    printk(KERN_ERR "start data..\n");
> +    for (i = 0; i < count;
> i++)    /* no newlines for each datum */
> +        printk(" %x",
> data[i]);
> +    printk(KERN_ERR "\n ..end data\n");
> +#endif
> +    return tty->ops->write(tty, data,
> count);
> +
> +}
> +
> +/*
> + * push the skb received to relevant
> + * protocol stacks
> + */
> +void st_send_frame(enum proto_type protoid, struct
> st_data_s *st_gdata)
> +{
> +    pr_info(" %s(prot:%d) ", __func__,
> protoid);
> +
> +    if (unlikely
> +        (st_gdata == NULL ||
> st_gdata->rx_skb == NULL
> +         ||
> st_gdata->list[protoid] == NULL)) {
> +        pr_err("protocol %d
> not registered, no data to send?",
> +           
>    protoid);
> +       
> 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[protoid]->recv != NULL)) {
> +        if
> (unlikely(st_gdata->list[protoid]->recv(st_gdata->rx_skb)
> +           
>      != ST_SUCCESS)) {
> +           
> pr_err(" proto stack %d's ->recv failed", protoid);
> +           
> kfree_skb(st_gdata->rx_skb);
> +           
> return;
> +        }
> +    } else {
> +        pr_err(" proto stack
> %d's ->recv null", protoid);
> +       
> kfree_skb(st_gdata->rx_skb);
> +    }
> +    pr_info(" done %s", __func__);
> +    return;
> +}
> +
> +/*
> + * to call registration complete callbacks
> + * of all protocol stack drivers
> + */
> +void st_reg_complete(struct st_data_s *st_gdata, char
> err)
> +{
> +    unsigned char i = 0;
> +    pr_info(" %s ", __func__);
> +    for (i = 0; i < ST_MAX; i++) {
> +        if (likely(st_gdata
> != NULL && st_gdata->list[i] != NULL &&
> +           
>    st_gdata->list[i]->reg_complete_cb
> != NULL))
> +           
> st_gdata->list[i]->reg_complete_cb(err);
> +    }
> +}
> +
> +static inline int st_check_data_len(struct st_data_s
> *st_gdata,
> +    int protoid, int len)
> +{
> +    register int room =
> skb_tailroom(st_gdata->rx_skb);
> +
> +    pr_info("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(protoid, 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_BT_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;
> +
> +    return 0;
> +}
> +
> +/* internal function for action when wake-up ack
> + * received
> + */
> +static inline void st_wakeup_ack(struct st_data_s
> *st_gdata,
> +    unsigned char cmd)
> +{
> +    register 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);
> +}
> +
> +/* Decodes received RAW data and forwards to
> corresponding
> + * client drivers (Bluetooth,FM,GPS..etc).
> + *
> + */
> +void st_int_recv(void *disc_data,
> +    const unsigned char *data, long count)
> +{
> +    register char *ptr;
> +    struct hci_event_hdr *eh;
> +    struct hci_acl_hdr *ah;
> +    struct hci_sco_hdr *sh;
> +    struct fm_event_hdr *fm;
> +    struct gps_event_hdr *gps;
> +    register int len = 0, type = 0, dlen =
> 0;
> +    static enum proto_type protoid =
> ST_MAX;
> +    struct st_data_s *st_gdata = (struct
> st_data_s *)disc_data;
> +
> +    ptr = (char *)data;
> +    /* tty_receive sent null ? */
> +    if (unlikely(ptr == NULL) || (st_gdata
> == NULL)) {
> +        pr_err(" received
> null from TTY ");
> +        return;
> +    }
> +
> +    pr_info("count %ld rx_state %ld"
> +       
>    "rx_count %ld", count,
> st_gdata->rx_state,
> +       
>    st_gdata->rx_count);
> +
> +    /* Decode received bytes here */
> +    while (count) {
> +        if
> (st_gdata->rx_count) {
> +           
> len = min_t(unsigned int, st_gdata->rx_count, count);
> +           
> memcpy(skb_put(st_gdata->rx_skb, len), 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_BT_W4_DATA:
> +           
>     pr_info("Complete pkt received");
> +
> +           
>     /* Ask ST CORE to forward
> +           
>      * the packet to protocol
> driver */
> +           
>     st_send_frame(protoid, st_gdata);
> +
> +           
>     st_gdata->rx_state =
> ST_W4_PACKET_TYPE;
> +           
>     st_gdata->rx_skb = NULL;
> +           
>     protoid = ST_MAX;    /* is
> this required ? */
> +           
>     continue;
> +
> +           
>     /* Waiting for Bluetooth event header ?
> */
> +           
> case ST_BT_W4_EVENT_HDR:
> +           
>     eh = (struct hci_event_hdr
> *)st_gdata->rx_skb->
> +           
>         data;
> +
> +           
>     pr_info("Event header: evt 0x%2.2x"
> +           
>        
>    "plen %d", eh->evt, eh->plen);
> +
> +           
>     st_check_data_len(st_gdata, protoid,
> eh->plen);
> +           
>     continue;
> +
> +           
>     /* Waiting for Bluetooth acl header ? */
> +           
> case ST_BT_W4_ACL_HDR:
> +           
>     ah = (struct hci_acl_hdr
> *)st_gdata->rx_skb->
> +           
>         data;
> +           
>     dlen = __le16_to_cpu(ah->dlen);
> +
> +           
>     pr_info("ACL header: dlen %d", dlen);
> +
> +           
>     st_check_data_len(st_gdata, protoid,
> dlen);
> +           
>     continue;
> +
> +           
>     /* Waiting for Bluetooth sco header ? */
> +           
> case ST_BT_W4_SCO_HDR:
> +           
>     sh = (struct hci_sco_hdr
> *)st_gdata->rx_skb->
> +           
>         data;
> +
> +           
>     pr_info("SCO header: dlen %d",
> sh->dlen);
> +
> +           
>     st_check_data_len(st_gdata, protoid,
> sh->dlen);
> +           
>     continue;
> +           
> case ST_FM_W4_EVENT_HDR:
> +           
>     fm = (struct fm_event_hdr
> *)st_gdata->rx_skb->
> +           
>         data;
> +           
>     pr_info("FM Header: ");
> +           
>     st_check_data_len(st_gdata, ST_FM,
> fm->plen);
> +           
>     continue;
> +           
>     /* TODO : Add GPS packet machine logic
> here */
> +           
> case ST_GPS_W4_EVENT_HDR:
> +           
>     /* [0x09 pkt hdr][R/W byte][2 byte len]
> */
> +           
>     gps = (struct gps_event_hdr
> *)st_gdata->rx_skb->
> +           
>          data;
> +           
>     pr_info("GPS Header: ");
> +           
>     st_check_data_len(st_gdata, ST_GPS,
> gps->plen);
> +           
>     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) {
> +
> +           
> /* Bluetooth event packet? */
> +        case HCI_EVENT_PKT:
> +           
> pr_info("Event packet");
> +           
> st_gdata->rx_state = ST_BT_W4_EVENT_HDR;
> +           
> st_gdata->rx_count = HCI_EVENT_HDR_SIZE;
> +           
> type = HCI_EVENT_PKT;
> +           
> protoid = ST_BT;
> +           
> break;
> +
> +           
> /* Bluetooth acl packet? */
> +        case
> HCI_ACLDATA_PKT:
> +           
> pr_info("ACL packet");
> +           
> st_gdata->rx_state = ST_BT_W4_ACL_HDR;
> +           
> st_gdata->rx_count = HCI_ACL_HDR_SIZE;
> +           
> type = HCI_ACLDATA_PKT;
> +           
> protoid = ST_BT;
> +           
> break;
> +
> +           
> /* Bluetooth sco packet? */
> +        case
> HCI_SCODATA_PKT:
> +           
> pr_info("SCO packet");
> +           
> st_gdata->rx_state = ST_BT_W4_SCO_HDR;
> +           
> st_gdata->rx_count = HCI_SCO_HDR_SIZE;
> +           
> type = HCI_SCODATA_PKT;
> +           
> protoid = ST_BT;
> +           
> break;
> +
> +           
> /* Channel 8(FM) packet? */
> +        case ST_FM_CH8_PKT:
> +           
> pr_info("FM CH8 packet");
> +           
> type = ST_FM_CH8_PKT;
> +           
> st_gdata->rx_state = ST_FM_W4_EVENT_HDR;
> +           
> st_gdata->rx_count = FM_EVENT_HDR_SIZE;
> +           
> protoid = ST_FM;
> +           
> break;
> +
> +           
> /* Channel 9(GPS) packet? */
> +        case
> 0x9:    /*ST_LL_GPS_CH9_PKT */
> +           
> pr_info("GPS CH9 packet");
> +           
> type = 0x9;    /* ST_LL_GPS_CH9_PKT; */
> +           
> protoid = ST_GPS;
> +           
> st_gdata->rx_state = ST_GPS_W4_EVENT_HDR;
> +           
> st_gdata->rx_count = 3;    /*
> GPS_EVENT_HDR_SIZE -1*/
> +           
> break;
> +        case LL_SLEEP_IND:
> +        case LL_SLEEP_ACK:
> +        case
> LL_WAKE_UP_IND:
> +           
> pr_info("PM packet");
> +           
> /* this takes appropriate action based on
> +       
>      * sleep state received --
> +       
>      */
> +           
> st_ll_sleep_state(st_gdata, *ptr);
> +           
> ptr++;
> +           
> count--;
> +           
> continue;
> +        case
> LL_WAKE_UP_ACK:
> +           
> pr_info("PM packet");
> +           
> /* wake up ack received */
> +           
> st_wakeup_ack(st_gdata, *ptr);
> +           
> ptr++;
> +           
> count--;
> +           
> continue;
> +           
> /* Unknow packet? */
> +        default:
> +           
> pr_err("Unknown packet type %2.2x", (__u8) *ptr);
> +           
> ptr++;
> +           
> count--;
> +           
> continue;
> +        };
> +        ptr++;
> +        count--;
> +
> +        switch (protoid) {
> +        case ST_BT:
> +           
> /* Allocate new packet to hold received data */
> +           
> st_gdata->rx_skb =
> +           
>     bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
> +           
> if (!st_gdata->rx_skb) {
> +           
>     pr_err("Can't allocate mem for new
> packet");
> +           
>     st_gdata->rx_state =
> ST_W4_PACKET_TYPE;
> +           
>     st_gdata->rx_count = 0;
> +           
>     return;
> +           
> }
> +           
> bt_cb(st_gdata->rx_skb)->pkt_type = type;
> +           
> break;
> +        case
> ST_FM:    /* for FM */
> +           
> st_gdata->rx_skb =
> +           
>     alloc_skb(FM_MAX_FRAME_SIZE, GFP_ATOMIC);
> +           
> if (!st_gdata->rx_skb) {
> +           
>     pr_err("Can't allocate mem for new
> packet");
> +           
>     st_gdata->rx_state =
> ST_W4_PACKET_TYPE;
> +           
>     st_gdata->rx_count = 0;
> +           
>     return;
> +           
> }
> +           
> /* place holder 0x08 */
> +           
> skb_reserve(st_gdata->rx_skb, 1);
> +           
> st_gdata->rx_skb->cb[0] = ST_FM_CH8_PKT;
> +           
> break;
> +        case ST_GPS:
> +           
> /* for GPS */
> +           
> st_gdata->rx_skb =
> +           
>     alloc_skb(100 /*GPS_MAX_FRAME_SIZE */ ,
> GFP_ATOMIC);
> +           
> if (!st_gdata->rx_skb) {
> +           
>     pr_err("Can't allocate mem for new
> packet");
> +           
>     st_gdata->rx_state =
> ST_W4_PACKET_TYPE;
> +           
>     st_gdata->rx_count = 0;
> +           
>     return;
> +           
> }
> +           
> /* place holder 0x09 */
> +           
> skb_reserve(st_gdata->rx_skb, 1);
> +           
> st_gdata->rx_skb->cb[0] = 0x09;   
> /*ST_GPS_CH9_PKT; */
> +           
> break;
> +        case ST_MAX:
> +           
> break;
> +        }
> +    }
> +    pr_info("done %s", __func__);
> +    return;
> +}
> +
> +/* internal de-Q function
> + * -- return previous in-completely written skb
> + *  or return the skb in the txQ
> + */
> +struct sk_buff *st_int_dequeue(struct st_data_s
> *st_gdata)
> +{
> +    struct sk_buff *returning_skb;
> +
> +    pr_info("%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
> + */
> +void st_int_enqueue(struct st_data_s *st_gdata, struct
> sk_buff *skb)
> +{
> +    unsigned long flags = 0;
> +
> +    pr_info("%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)) {
> +    case ST_LL_AWAKE:
> +        pr_info("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:    /* host cannot be
> in this state */
> +        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;
> +    default:
> +        pr_err("ST LL is
> illegal state(%ld),"
> +           
>    "purging received skb.",
> st_ll_getstate(st_gdata));
> +        kfree_skb(skb);
> +        break;
> +    }
> +   
> spin_unlock_irqrestore(&st_gdata->lock, flags);
> +    pr_info("done %s", __func__);
> +    return;
> +}
> +
> +/*
> + * internal wakeup function
> + * called from either
> + * - TTY layer when write's finished
> + * - st_write (in context of the protocol stack)
> + */
> +void st_tx_wakeup(struct st_data_s *st_data)
> +{
> +    struct sk_buff *skb;
> +    unsigned long flags;   
> /* for irq save flags */
> +    pr_info("%s", __func__);
> +    /* check for sending & set flag
> sending here */
> +    if (test_and_set_bit(ST_TX_SENDING,
> &st_data->tx_state)) {
> +        pr_info("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;
> +           
> }
> +           
> 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,
> char *buf)
> +{
> +    unsigned long flags = 0;
> +#ifdef DEBUG
> +    unsigned char i = ST_MAX;
> +#endif
> +   
> spin_lock_irqsave(&st_gdata->lock, flags);
> +#ifdef DEBUG       
>     /* more detailed log */
> +    for (i = 0; i < ST_MAX; i++) {
> +        if (i == 0) {
> +           
> sprintf(buf, "%s is %s", protocol_strngs[i],
> +           
>     st_gdata->list[i] !=
> +           
>     NULL ? "Registered" : "Unregistered");
> +        } else {
> +           
> sprintf(buf, "%s\n%s is %s", buf, protocol_strngs[i],
> +           
>     st_gdata->list[i] !=
> +           
>     NULL ? "Registered" : "Unregistered");
> +        }
> +    }
> +    sprintf(buf, "%s\n", buf);
> +#else /* limited info */
> +    sprintf(buf, "BT=%c\nFM=%c\nGPS=%c\n",
> +       
> st_gdata->list[ST_BT] != NULL ? 'R' : 'U',
> +       
> st_gdata->list[ST_FM] != NULL ? 'R' : 'U',
> +       
> st_gdata->list[ST_GPS] != NULL ? 'R' : 'U');
> +#endif
> +   
> spin_unlock_irqrestore(&st_gdata->lock, flags);
> +}
> +
> +/********************************************************************/
> +/*
> + * 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 = ST_SUCCESS;
> +    unsigned long flags = 0;
> +
> +    st_kim_ref(&st_gdata);
> +    pr_info("%s(%d) ", __func__,
> new_proto->type);
> +    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
> ST_ERR_FAILURE;
> +    }
> +
> +    if (new_proto->type < ST_BT ||
> new_proto->type >= ST_MAX) {
> +        pr_err("protocol %d
> not supported", new_proto->type);
> +        return
> ST_ERR_NOPROTO;
> +    }
> +
> +    if
> (st_gdata->list[new_proto->type] != NULL) {
> +        pr_err("protocol %d
> already registered", new_proto->type);
> +        return
> ST_ERR_ALREADY;
> +    }
> +
> +    /* 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->type);
> +        /* fw download in
> progress */
> +       
> st_kim_chip_toggle(new_proto->type, KIM_GPIO_ACTIVE);
> +
> +       
> st_gdata->list[new_proto->type] = new_proto;
> +        new_proto->write
> = st_write;
> +
> +       
> set_bit(ST_REG_PENDING, &st_gdata->st_state);
> +       
> spin_unlock_irqrestore(&st_gdata->lock, flags);
> +        return
> ST_ERR_PENDING;
> +    } else if
> (st_gdata->protos_registered == ST_EMPTY) {
> +        pr_info(" protocol
> list empty :%d ", new_proto->type);
> +       
> set_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state);
> +        st_recv =
> st_kim_recv;
> +
> +        /* release lock
> previously held - re-locked below */
> +       
> spin_unlock_irqrestore(&st_gdata->lock, flags);
> +
> +        /* enable the ST LL
> - to set default chip state */
> +       
> st_ll_enable(st_gdata);
> +        /* this may take a
> while to complete
> +         * since
> it involves BT fw download
> +         */
> +        err =
> st_kim_start();
> +        if (err !=
> ST_SUCCESS) {
> +           
> 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
> ");
> +           
>     st_reg_complete(st_gdata,
> ST_ERR_FAILURE);
> +           
> }
> +
> +           
> return ST_ERR_FAILURE;
> +        }
> +
> +        /* the protocol
> might require other gpios to be toggled
> +         */
> +       
> st_kim_chip_toggle(new_proto->type, KIM_GPIO_ACTIVE);
> +
> +       
> 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_info(" call reg complete callback ");
> +           
> st_gdata->protos_registered++;
> +           
> st_reg_complete(st_gdata, ST_SUCCESS);
> +        }
> +       
> clear_bit(ST_REG_PENDING, &st_gdata->st_state);
> +
> +        /* check for already
> registered once more,
> +         * since
> the above check is old
> +         */
> +        if
> (st_gdata->list[new_proto->type] != NULL) {
> +           
> pr_err(" proto %d already registered ",
> +           
>        new_proto->type);
> +           
> return ST_ERR_ALREADY;
> +        }
> +
> +       
> spin_lock_irqsave(&st_gdata->lock, flags);
> +       
> st_gdata->list[new_proto->type] = new_proto;
> +        new_proto->write
> = st_write;
> +       
> spin_unlock_irqrestore(&st_gdata->lock, flags);
> +        return err;
> +    }
> +    /* if fw is already downloaded &
> new stack registers protocol */
> +    else {
> +        switch
> (new_proto->type) {
> +        case ST_BT:
> +           
> /* do nothing */
> +           
> break;
> +        case ST_FM:
> +        case ST_GPS:
> +           
> st_kim_chip_toggle(new_proto->type, KIM_GPIO_ACTIVE);
> +           
> break;
> +        case ST_MAX:
> +        default:
> +           
> pr_err("%d protocol not supported",
> +           
>        new_proto->type);
> +           
> err = ST_ERR_NOPROTO;
> +           
> /* something wrong */
> +           
> break;
> +        }
> +       
> st_gdata->list[new_proto->type] = new_proto;
> +        new_proto->write
> = st_write;
> +
> +        /* lock already held
> before entering else */
> +       
> spin_unlock_irqrestore(&st_gdata->lock, flags);
> +        return err;
> +    }
> +    pr_info("done %s(%d) ", __func__,
> new_proto->type);
> +}
> +EXPORT_SYMBOL_GPL(st_register);
> +
> +/* to unregister a protocol -
> + * to be called from protocol stack driver
> + */
> +long st_unregister(enum proto_type type)
> +{
> +    long err = ST_SUCCESS;
> +    unsigned long flags = 0;
> +    struct st_data_s   
> *st_gdata;
> +
> +    pr_info("%s: %d ", __func__, type);
> +
> +    st_kim_ref(&st_gdata);
> +    if (type < ST_BT || type >=
> ST_MAX) {
> +        pr_err(" protocol %d
> not supported", type);
> +        return
> ST_ERR_NOPROTO;
> +    }
> +
> +   
> spin_lock_irqsave(&st_gdata->lock, flags);
> +
> +    if (st_gdata->list[type] == NULL) {
> +        pr_err(" protocol %d
> not registered", type);
> +       
> spin_unlock_irqrestore(&st_gdata->lock, flags);
> +        return
> ST_ERR_NOPROTO;
> +    }
> +
> +    st_gdata->protos_registered--;
> +    st_gdata->list[type] = NULL;
> +
> +    /* kim ignores BT in the below
> function
> +     * and handles the rest, BT
> is toggled
> +     * only in kim_start and
> kim_stop
> +     */
> +    st_kim_chip_toggle(type,
> KIM_GPIO_INACTIVE);
> +   
> 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
> protocols unregistered ");
> +
> +        /* stop traffic on
> tty */
> +        if
> (st_gdata->tty) {
> +           
> tty_ldisc_flush(st_gdata->tty);
> +           
> stop_tty(st_gdata->tty);
> +        }
> +
> +        /* all protocols now
> unregistered */
> +        st_kim_stop();
> +        /* 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;
> +#ifdef DEBUG
> +    enum proto_type protoid = ST_MAX;
> +#endif
> +    long len;
> +
> +    st_kim_ref(&st_gdata);
> +    if (unlikely(skb == NULL || st_gdata ==
> NULL
> +        || st_gdata->tty
> == NULL)) {
> +        pr_err("data/tty
> unavailable to perform write");
> +        return
> ST_ERR_FAILURE;
> +    }
> +#ifdef DEBUG       
>     /* open-up skb to read the 1st byte */
> +    switch (skb->data[0]) {
> +    case HCI_COMMAND_PKT:
> +    case HCI_ACLDATA_PKT:
> +    case HCI_SCODATA_PKT:
> +        protoid = ST_BT;
> +        break;
> +    case ST_FM_CH8_PKT:
> +        protoid = ST_FM;
> +        break;
> +    case 0x09:
> +        protoid = ST_GPS;
> +        break;
> +    }
> +    if (unlikely(st_gdata->list[protoid]
> == NULL)) {
> +        pr_err(" protocol %d
> not registered, and writing? ",
> +           
>    protoid);
> +        return
> ST_ERR_FAILURE;
> +    }
> +#endif
> +    pr_info("%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)
> +{
> +    int err = ST_SUCCESS;
> +    struct st_data_s *st_gdata;
> +    pr_info("%s ", __func__);
> +
> +    st_kim_ref(&st_gdata);
> +    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();
> +    pr_info("done %s", __func__);
> +    return err;
> +}
> +
> +static void st_tty_close(struct tty_struct *tty)
> +{
> +    unsigned char i = ST_MAX;
> +    unsigned long flags = 0;
> +    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; i++) {
> +        if
> (st_gdata->list[i] != NULL)
> +           
> pr_err("%d not un-registered", i);
> +        st_gdata->list[i]
> = NULL;
> +    }
> +   
> 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->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_info("%s: done ", __func__);
> +}
> +
> +static void st_tty_receive(struct tty_struct *tty, const
> unsigned char *data,
> +           
>    char *tty_flags, int count)
> +{
> +
> +#ifdef VERBOSE
> +    long i;
> +    printk(KERN_ERR "incoming data...\n");
> +    for (i = 0; i < count; i++)
> +        printk(" %x",
> data[i]);
> +    printk(KERN_ERR "\n.. data end\n");
> +#endif
> +
> +    /*
> +     * if fw download is in
> progress then route incoming data
> +     * to KIM for validation
> +     */
> +    st_recv(tty->disc_data, data,
> count);
> +    pr_info("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_info("%s ", __func__);
> +    /* don't do an wakeup for now */
> +    clear_bit(TTY_DO_WRITE_WAKEUP,
> &tty->flags);
> +
> +    /* call our internal wakeup */
> +    st_tx_wakeup((void *)st_gdata);
> +}
> +
> +static void st_tty_flush_buffer(struct tty_struct *tty)
> +{
> +    struct    st_data_s
> *st_gdata = tty->disc_data;
> +    pr_info("%s ", __func__);
> +
> +    kfree_skb(st_gdata->tx_skb);
> +    st_gdata->tx_skb = NULL;
> +
> +    tty->ops->flush_buffer(tty);
> +    return;
> +}
> +
> +/********************************************************************/
> +int st_core_init(struct st_data_s **core_data)
> +{
> +    struct st_data_s *st_gdata;
> +    long err;
> +    static struct tty_ldisc_ops
> *st_ldisc_ops;
> +
> +    /* populate and register to TTY line
> discipline */
> +    st_ldisc_ops =
> kzalloc(sizeof(*st_ldisc_ops), GFP_KERNEL);
> +    if (!st_ldisc_ops) {
> +        pr_err("no mem to
> allocate");
> +        return -ENOMEM;
> +    }
> +
> +    st_ldisc_ops->magic =
> TTY_LDISC_MAGIC;
> +    st_ldisc_ops->name =
> "n_st";    /*"n_hci"; */
> +    st_ldisc_ops->open = st_tty_open;
> +    st_ldisc_ops->close = st_tty_close;
> +    st_ldisc_ops->receive_buf =
> st_tty_receive;
> +    st_ldisc_ops->write_wakeup =
> st_tty_wakeup;
> +    st_ldisc_ops->flush_buffer =
> st_tty_flush_buffer;
> +    st_ldisc_ops->owner = THIS_MODULE;
> +
> +    err = tty_register_ldisc(N_TI_WL,
> st_ldisc_ops);
> +    if (err) {
> +        pr_err("error
> registering %d line discipline %ld",
> +           
>    N_TI_WL, err);
> +       
> kfree(st_ldisc_ops);
> +        return err;
> +    }
> +    pr_info("registered n_shared line
> discipline");
> +
> +    st_gdata = kzalloc(sizeof(struct
> st_data_s), GFP_KERNEL);
> +    if (!st_gdata) {
> +        pr_err("memory
> allocation failed");
> +        err =
> tty_unregister_ldisc(N_TI_WL);
> +        if (err)
> +           
> pr_err("unable to un-register ldisc %ld", err);
> +       
> kfree(st_ldisc_ops);
> +        err = -ENOMEM;
> +        return err;
> +    }
> +
> +    /* 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);
> +
> +    /* ldisc_ops ref to be only used in
> __exit of module */
> +    st_gdata->ldisc_ops = st_ldisc_ops;
> +
> +#if 0
> +    err = st_kim_init();
> +    if (err) {
> +        pr_err("error during
> kim initialization(%ld)", err);
> +        kfree(st_gdata);
> +        err =
> tty_unregister_ldisc(N_TI_WL);
> +        if (err)
> +           
> pr_err("unable to un-register ldisc");
> +       
> kfree(st_ldisc_ops);
> +        return -1;
> +    }
> +#endif
> +
> +    err = st_ll_init(st_gdata);
> +    if (err) {
> +        pr_err("error during
> st_ll initialization(%ld)", err);
> +        kfree(st_gdata);
> +        err =
> tty_unregister_ldisc(N_TI_WL);
> +        if (err)
> +           
> pr_err("unable to un-register ldisc");
> +       
> kfree(st_ldisc_ops);
> +        return -1;
> +    }
> +    *core_data = st_gdata;
> +    return 0;
> +}
> +
> +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 0
> +    err = st_kim_deinit();
> +    if (err)
> +        pr_err("error during
> deinit of ST KIM %ld", err);
> +#endif
> +    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
> */
> +        err =
> tty_unregister_ldisc(N_TI_WL);
> +        if (err)
> +           
> pr_err("unable to un-register ldisc %ld", err);
> +       
> kfree(st_gdata->ldisc_ops);
> +        /* free the global
> data pointer */
> +        kfree(st_gdata);
> +    }
> +}
> +
> +
> diff --git a/drivers/staging/ti-st/st_core.h
> b/drivers/staging/ti-st/st_core.h
> new file mode 100644
> index 0000000..f271c88
> --- /dev/null
> +++ b/drivers/staging/ti-st/st_core.h
> @@ -0,0 +1,98 @@
> +/*
> + *  Shared Transport Core header file
> + *
> + *  Copyright (C) 2009 Texas Instruments
> + *
> + *  This program is free software; you can
> redistribute it and/or modify
> + *  it under the terms of the GNU General Public
> License version 2 as
> + *  published by the Free Software Foundation.
> + *
> + *  This program is distributed in the hope that it
> will be useful,
> + *  but WITHOUT ANY WARRANTY; without even the
> implied warranty of
> + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR
> PURPOSE.  See the
> + *  GNU General Public License for more details.
> + *
> + *  You should have received a copy of the GNU
> General Public License
> + *  along with this program; if not, write to the
> Free Software
> + *  Foundation, Inc., 59 Temple Place, Suite 330,
> Boston, MA  02111-1307  USA
> + *
> + */
> +
> +#ifndef ST_CORE_H
> +#define ST_CORE_H
> +
> +#include <linux/skbuff.h>
> +#include "st.h"
> +
> +/* states of protocol list */
> +#define ST_NOTEMPTY    1
> +#define ST_EMPTY    0
> +
> +/*
> + * possible st_states
> + */
> +#define ST_INITIALIZING   
>     1
> +#define ST_REG_IN_PROGRESS    2
> +#define ST_REG_PENDING   
>     3
> +#define ST_WAITING_FOR_RESP    4
> +
> +/*
> + * local data required for ST/KIM/ST-HCI-LL
> + */
> +struct st_data_s {
> +    unsigned long st_state;
> +/*
> + * an instance of tty_struct & ldisc ops to move
> around
> + */
> +    struct tty_struct *tty;
> +    struct tty_ldisc_ops *ldisc_ops;
> +/*
> + * the tx skb -
> + * if the skb is already dequeued and the tty failed to
> write the same
> + * maintain the skb to write in the next transaction
> + */
> +    struct sk_buff *tx_skb;
> +#define ST_TX_SENDING    1
> +#define ST_TX_WAKEUP    2
> +    unsigned long tx_state;
> +/*
> + * list of protocol registered
> + */
> +    struct st_proto_s *list[ST_MAX];
> +/*
> + * lock
> + */
> +    unsigned long rx_state;
> +    unsigned long rx_count;
> +    struct sk_buff *rx_skb;
> +    struct sk_buff_head txq, tx_waitq;
> +    spinlock_t lock;    /*
> ST LL state lock  */
> +    unsigned char   
> protos_registered;
> +    unsigned long
> ll_state;    /* ST LL power state */
> +};
> +
> +/* point this to tty->driver->write or
> tty->ops->write
> + * depending upon the kernel version
> + */
> +int st_int_write(struct st_data_s*, const unsigned char*,
> int);
> +/* internal write function, passed onto protocol drivers
> + * via the write function ptr of protocol struct
> + */
> +long st_write(struct sk_buff *);
> +/* function to be called from ST-LL
> + */
> +void st_ll_send_frame(enum proto_type, struct sk_buff *);
> +/* internal wake up function */
> +void st_tx_wakeup(struct st_data_s *st_data);
> +
> +int st_core_init(struct st_data_s **);
> +void st_core_exit(struct st_data_s *);
> +void st_kim_ref(struct st_data_s **);
> +
> +#define GPS_STUB_TEST
> +#ifdef GPS_STUB_TEST
> +int gps_chrdrv_stub_write(const unsigned char*, int);
> +void gps_chrdrv_stub_init(void);
> +#endif
> +
> +#endif /*ST_CORE_H */
> -- 
> 1.5.4.3
> 
> 

Any comments on these patches ?


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