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    Subject[PATCH] bluetooth: BT driver using ST for TI combo devices
    Date
    From: Pavan Savoy <pavan_savoy@ti.com>

    This is BlueZ driver making use of Shared Transport line
    discipline to communicate with the chip.

    Signed-off-by: Pavan Savoy <pavan_savoy@ti.com>
    ---
    drivers/staging/ti-st/bt_drv.c | 502 ++++++++++++++++++++++++++++++++++++++++
    drivers/staging/ti-st/bt_drv.h | 61 +++++
    2 files changed, 563 insertions(+), 0 deletions(-)
    create mode 100644 drivers/staging/ti-st/bt_drv.c
    create mode 100644 drivers/staging/ti-st/bt_drv.h

    diff --git a/drivers/staging/ti-st/bt_drv.c b/drivers/staging/ti-st/bt_drv.c
    new file mode 100644
    index 0000000..d8420b5
    --- /dev/null
    +++ b/drivers/staging/ti-st/bt_drv.c
    @@ -0,0 +1,502 @@
    +/*
    + * Texas Instrument's Bluetooth Driver For Shared Transport.
    + *
    + * Bluetooth Driver acts as interface between HCI CORE and
    + * TI Shared Transport Layer.
    + *
    + * 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
    + *
    + */
    +
    +#include <net/bluetooth/bluetooth.h>
    +#include <net/bluetooth/hci_core.h>
    +
    +#include "st.h"
    +#include "bt_drv.h"
    +
    +/* Define this macro to get debug msg */
    +#undef DEBUG
    +
    +#ifdef DEBUG
    +#define BT_DRV_DBG(fmt, arg...) printk(KERN_INFO "(btdrv):"fmt"\n" , ## arg)
    +#define BTDRV_API_START() printk(KERN_INFO "(btdrv): %s Start\n", \
    + __func__)
    +#define BTDRV_API_EXIT(errno) printk(KERN_INFO "(btdrv): %s Exit(%d)\n", \
    + __func__, errno)
    +#else
    +#define BT_DRV_DBG(fmt, arg...)
    +#define BTDRV_API_START()
    +#define BTDRV_API_EXIT(errno)
    +#endif
    +
    +#define BT_DRV_ERR(fmt, arg...) printk(KERN_ERR "(btdrv):"fmt"\n" , ## arg)
    +
    +static int reset;
    +static struct hci_st *hst;
    +
    +/* Increments HCI counters based on pocket ID (cmd,acl,sco) */
    +static inline void hci_st_tx_complete(struct hci_st *hst, int pkt_type)
    +{
    + struct hci_dev *hdev;
    +
    + BTDRV_API_START();
    +
    + hdev = hst->hdev;
    +
    + /* Update HCI stat counters */
    + switch (pkt_type) {
    + case HCI_COMMAND_PKT:
    + hdev->stat.cmd_tx++;
    + break;
    +
    + case HCI_ACLDATA_PKT:
    + hdev->stat.acl_tx++;
    + break;
    +
    + case HCI_SCODATA_PKT:
    + hdev->stat.cmd_tx++;
    + break;
    + }
    +
    + BTDRV_API_EXIT(0);
    +}
    +
    +/* ------- Interfaces to Shared Transport ------ */
    +
    +/* Called by ST layer to indicate protocol registration completion
    + * status.hci_st_open() function will wait for signal from this
    + * API when st_register() function returns ST_PENDING.
    + */
    +static void hci_st_registration_completion_cb(char data)
    +{
    + BTDRV_API_START();
    +
    + /* hci_st_open() function needs value of 'data' to know
    + * the registration status(success/fail),So have a back
    + * up of it.
    + */
    + hst->streg_cbdata = data;
    +
    + /* Got a feedback from ST for BT driver registration
    + * request.Wackup hci_st_open() function to continue
    + * it's open operation.
    + */
    + complete(&hst->wait_for_btdrv_reg_completion);
    +
    + BTDRV_API_EXIT(0);
    +}
    +
    +/* Called by Shared Transport layer when receive data is
    + * available */
    +static long hci_st_receive(struct sk_buff *skb)
    +{
    + int err;
    + int len;
    +
    + BTDRV_API_START();
    +
    + err = 0;
    + len = 0;
    +
    + if (skb == NULL) {
    + BT_DRV_ERR("Invalid SKB received from ST");
    + BTDRV_API_EXIT(-EFAULT);
    + return -EFAULT;
    + }
    + if (!hst) {
    + kfree_skb(skb);
    + BT_DRV_ERR("Invalid hci_st memory,freeing SKB");
    + BTDRV_API_EXIT(-EFAULT);
    + return -EFAULT;
    + }
    + if (!test_bit(BT_DRV_RUNNING, &hst->flags)) {
    + kfree_skb(skb);
    + BT_DRV_ERR("Device is not running,freeing SKB");
    + BTDRV_API_EXIT(-EINVAL);
    + return -EINVAL;
    + }
    +
    + len = skb->len;
    + skb->dev = (struct net_device *)hst->hdev;
    +
    + /* Forward skb to HCI CORE layer */
    + err = hci_recv_frame(skb);
    + if (err) {
    + kfree_skb(skb);
    + BT_DRV_ERR("Unable to push skb to HCI CORE(%d),freeing SKB",
    + err);
    + BTDRV_API_EXIT(err);
    + return err;
    + }
    + hst->hdev->stat.byte_rx += len;
    +
    + BTDRV_API_EXIT(0);
    + return 0;
    +}
    +
    +/* ------- Interfaces to HCI layer ------ */
    +
    +/* Called from HCI core to initialize the device */
    +static int hci_st_open(struct hci_dev *hdev)
    +{
    + static struct st_proto_s hci_st_proto;
    + unsigned long timeleft;
    + int err;
    +
    + BTDRV_API_START();
    +
    + err = 0;
    +
    + BT_DRV_DBG("%s %p", hdev->name, hdev);
    +
    + /* Already registered with ST ? */
    + if (test_bit(BT_ST_REGISTERED, &hst->flags)) {
    + BT_DRV_ERR("Registered with ST already,open called again?");
    + BTDRV_API_EXIT(0);
    + return 0;
    + }
    +
    + /* Populate BT driver info required by ST */
    + memset(&hci_st_proto, 0, sizeof(hci_st_proto));
    +
    + /* BT driver ID */
    + hci_st_proto.type = ST_BT;
    +
    + /* Receive function which called from ST */
    + hci_st_proto.recv = hci_st_receive;
    +
    + /* Packet match function may used in future */
    + hci_st_proto.match_packet = NULL;
    +
    + /* Callback to be called when registration is pending */
    + hci_st_proto.reg_complete_cb = hci_st_registration_completion_cb;
    +
    + /* This is write function pointer of ST. BT driver will make use of this
    + * for sending any packets to chip. ST will assign and give to us, so
    + * make it as NULL */
    + hci_st_proto.write = NULL;
    +
    + /* Register with ST layer */
    + err = st_register(&hci_st_proto);
    + if (err == ST_ERR_PENDING) {
    + /* Prepare wait-for-completion handler data structures.
    + * Needed to syncronize this and st_registration_completion_cb()
    + * functions.
    + */
    + init_completion(&hst->wait_for_btdrv_reg_completion);
    +
    + /* Reset ST registration callback status flag , this value
    + * will be updated in hci_st_registration_completion_cb()
    + * function whenever it called from ST driver.
    + */
    + hst->streg_cbdata = -EINPROGRESS;
    +
    + /* ST is busy with other protocol registration(may be busy with
    + * firmware download).So,Wait till the registration callback
    + * (passed as a argument to st_register() function) getting
    + * called from ST.
    + */
    + BT_DRV_DBG(" %s waiting for reg completion signal from ST",
    + __func__);
    +
    + timeleft =
    + wait_for_completion_timeout
    + (&hst->wait_for_btdrv_reg_completion,
    + msecs_to_jiffies(BT_REGISTER_TIMEOUT));
    + if (!timeleft) {
    + BT_DRV_ERR("Timeout(%ld sec),didn't get reg"
    + "completion signal from ST",
    + BT_REGISTER_TIMEOUT / 1000);
    + BTDRV_API_EXIT(-ETIMEDOUT);
    + return -ETIMEDOUT;
    + }
    +
    + /* Is ST registration callback called with ERROR value? */
    + if (hst->streg_cbdata != 0) {
    + BT_DRV_ERR("ST reg completion CB called with invalid"
    + "status %d", hst->streg_cbdata);
    + BTDRV_API_EXIT(-EAGAIN);
    + return -EAGAIN;
    + }
    + err = 0;
    + } else if (err == ST_ERR_FAILURE) {
    + BT_DRV_ERR("st_register failed %d", err);
    + BTDRV_API_EXIT(-EAGAIN);
    + return -EAGAIN;
    + }
    +
    + /* Do we have proper ST write function? */
    + if (hci_st_proto.write != NULL) {
    + /* We need this pointer for sending any Bluetooth pkts */
    + hst->st_write = hci_st_proto.write;
    + } else {
    + BT_DRV_ERR("failed to get ST write func pointer");
    +
    + /* Undo registration with ST */
    + err = st_unregister(ST_BT);
    + if (err < 0)
    + BT_DRV_ERR("st_unregister failed %d", err);
    +
    + hst->st_write = NULL;
    + BTDRV_API_EXIT(-EAGAIN);
    + return -EAGAIN;
    + }
    +
    + /* Registration with ST layer is completed successfully,
    + * now chip is ready to accept commands from HCI CORE.
    + * Mark HCI Device flag as RUNNING
    + */
    + set_bit(HCI_RUNNING, &hdev->flags);
    +
    + /* Registration with ST successful */
    + set_bit(BT_ST_REGISTERED, &hst->flags);
    +
    + BTDRV_API_EXIT(err);
    + return err;
    +}
    +
    +/* Close device */
    +static int hci_st_close(struct hci_dev *hdev)
    +{
    + int err;
    +
    + BTDRV_API_START();
    +
    + err = 0;
    +
    + /* Unregister from ST layer */
    + if (test_and_clear_bit(BT_ST_REGISTERED, &hst->flags)) {
    + err = st_unregister(ST_BT);
    + if (err != ST_SUCCESS) {
    + BT_DRV_ERR("st_unregister failed %d", err);
    + BTDRV_API_EXIT(-EBUSY);
    + return -EBUSY;
    + }
    + }
    +
    + hst->st_write = NULL;
    +
    + /* ST layer would have moved chip to inactive state.
    + * So,clear HCI device RUNNING flag.
    + */
    + if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) {
    + BTDRV_API_EXIT(0);
    + return 0;
    + }
    +
    + BTDRV_API_EXIT(err);
    + return err;
    +}
    +
    +/* Called from HCI CORE , Sends frames to Shared Transport */
    +static int hci_st_send_frame(struct sk_buff *skb)
    +{
    + struct hci_dev *hdev;
    + struct hci_st *hst;
    + long len;
    +
    + BTDRV_API_START();
    +
    + if (skb == NULL) {
    + BT_DRV_ERR("Invalid skb received from HCI CORE");
    + BTDRV_API_EXIT(-ENOMEM);
    + return -ENOMEM;
    + }
    + hdev = (struct hci_dev *)skb->dev;
    + if (!hdev) {
    + BT_DRV_ERR("SKB received for invalid HCI Device (hdev=NULL)");
    + BTDRV_API_EXIT(-ENODEV);
    + return -ENODEV;
    + }
    + if (!test_bit(HCI_RUNNING, &hdev->flags)) {
    + BT_DRV_ERR("Device is not running");
    + BTDRV_API_EXIT(-EBUSY);
    + return -EBUSY;
    + }
    +
    + hst = (struct hci_st *)hdev->driver_data;
    +
    + /* Prepend skb with frame type */
    + memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
    +
    + BT_DRV_DBG(" %s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type,
    + skb->len);
    +
    + /* Insert skb to shared transport layer's transmit queue.
    + * Freeing skb memory is taken care in shared transport layer,
    + * so don't free skb memory here.
    + */
    + if (!hst->st_write) {
    + kfree_skb(skb);
    + BT_DRV_ERR(" Can't write to ST, st_write null?");
    + BTDRV_API_EXIT(-EAGAIN);
    + return -EAGAIN;
    + }
    + len = hst->st_write(skb);
    + if (len < 0) {
    + /* Something went wrong in st write , free skb memory */
    + kfree_skb(skb);
    + BT_DRV_ERR(" ST write failed (%ld)", len);
    + BTDRV_API_EXIT(-EAGAIN);
    + return -EAGAIN;
    + }
    +
    + /* ST accepted our skb. So, Go ahead and do rest */
    + hdev->stat.byte_tx += len;
    + hci_st_tx_complete(hst, bt_cb(skb)->pkt_type);
    +
    + BTDRV_API_EXIT(0);
    + return 0;
    +}
    +
    +static void hci_st_destruct(struct hci_dev *hdev)
    +{
    + BTDRV_API_START();
    +
    + if (!hdev) {
    + BT_DRV_ERR("Destruct called with invalid HCI Device"
    + "(hdev=NULL)");
    + BTDRV_API_EXIT(0);
    + return;
    + }
    +
    + BT_DRV_DBG("%s", hdev->name);
    +
    + /* free hci_st memory */
    + if (hdev->driver_data != NULL)
    + kfree(hdev->driver_data);
    +
    + BTDRV_API_EXIT(0);
    + return;
    +}
    +
    +/* Creates new HCI device */
    +static int hci_st_register_dev(struct hci_st *hst)
    +{
    + struct hci_dev *hdev;
    +
    + BTDRV_API_START();
    +
    + /* Initialize and register HCI device */
    + hdev = hci_alloc_dev();
    + if (!hdev) {
    + BT_DRV_ERR("Can't allocate HCI device");
    + BTDRV_API_EXIT(-ENOMEM);
    + return -ENOMEM;
    + }
    + BT_DRV_DBG(" HCI device allocated. hdev= %p", hdev);
    +
    + hst->hdev = hdev;
    + hdev->bus = HCI_UART;
    + hdev->driver_data = hst;
    + hdev->open = hci_st_open;
    + hdev->close = hci_st_close;
    + hdev->flush = NULL;
    + hdev->send = hci_st_send_frame;
    + hdev->destruct = hci_st_destruct;
    + hdev->owner = THIS_MODULE;
    +
    + if (reset)
    + set_bit(HCI_QUIRK_NO_RESET, &hdev->quirks);
    +
    + if (hci_register_dev(hdev) < 0) {
    + BT_DRV_ERR("Can't register HCI device");
    + hci_free_dev(hdev);
    + BTDRV_API_EXIT(-ENODEV);
    + return -ENODEV;
    + }
    +
    + BT_DRV_DBG(" HCI device registered. hdev= %p", hdev);
    + BTDRV_API_EXIT(0);
    + return 0;
    +}
    +
    +/* ------- Module Init interface ------ */
    +
    +static int __init bt_drv_init(void)
    +{
    + int err;
    +
    + BTDRV_API_START();
    +
    + err = 0;
    +
    + BT_DRV_DBG(" Bluetooth Driver Version %s", VERSION);
    +
    + /* Allocate local resource memory */
    + hst = kzalloc(sizeof(struct hci_st), GFP_KERNEL);
    + if (!hst) {
    + BT_DRV_ERR("Can't allocate control structure");
    + BTDRV_API_EXIT(-ENFILE);
    + return -ENFILE;
    + }
    +
    + /* Expose "hciX" device to user space */
    + err = hci_st_register_dev(hst);
    + if (err) {
    + /* Release local resource memory */
    + kfree(hst);
    +
    + BT_DRV_ERR("Unable to expose hci0 device(%d)", err);
    + BTDRV_API_EXIT(err);
    + return err;
    + }
    + set_bit(BT_DRV_RUNNING, &hst->flags);
    +
    + BTDRV_API_EXIT(err);
    + return err;
    +}
    +
    +/* ------- Module Exit interface ------ */
    +
    +static void __exit bt_drv_exit(void)
    +{
    + BTDRV_API_START();
    +
    + /* Deallocate local resource's memory */
    + if (hst) {
    + struct hci_dev *hdev = hst->hdev;
    +
    + if (hdev == NULL) {
    + BT_DRV_ERR("Invalid hdev memory");
    + kfree(hst);
    + } else {
    + hci_st_close(hdev);
    + if (test_and_clear_bit(BT_DRV_RUNNING, &hst->flags)) {
    + /* Remove HCI device (hciX) created
    + * in module init.
    + */
    + hci_unregister_dev(hdev);
    +
    + /* Free HCI device memory */
    + hci_free_dev(hdev);
    + }
    + }
    + }
    + BTDRV_API_EXIT(0);
    +}
    +
    +module_init(bt_drv_init);
    +module_exit(bt_drv_exit);
    +
    +/* ------ Module Info ------ */
    +
    +module_param(reset, bool, 0644);
    +MODULE_PARM_DESC(reset, "Send HCI reset command on initialization");
    +MODULE_AUTHOR("Raja Mani <raja_mani@ti.com>");
    +MODULE_DESCRIPTION("Bluetooth Driver for TI Shared Transport" VERSION);
    +MODULE_VERSION(VERSION);
    +MODULE_LICENSE("GPL");
    diff --git a/drivers/staging/ti-st/bt_drv.h b/drivers/staging/ti-st/bt_drv.h
    new file mode 100644
    index 0000000..a0beebe
    --- /dev/null
    +++ b/drivers/staging/ti-st/bt_drv.h
    @@ -0,0 +1,61 @@
    +/*
    + * Texas Instrument's Bluetooth Driver For Shared Transport.
    + *
    + * Bluetooth Driver acts as interface between HCI CORE and
    + * TI Shared Transport Layer.
    + *
    + * 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 _BT_DRV_H
    +#define _BT_DRV_H
    +
    +/* Bluetooth Driver Version */
    +#define VERSION "1.0"
    +
    +/* Defines number of seconds to wait for reg completion
    + * callback getting called from ST (in case,registration
    + * with ST returns PENDING status)
    + */
    +#define BT_REGISTER_TIMEOUT msecs_to_jiffies(6000) /* 6 sec */
    +
    +/* BT driver's local status */
    +#define BT_DRV_RUNNING 0
    +#define BT_ST_REGISTERED 1
    +
    +/* BT driver operation structure */
    +struct hci_st {
    +
    + /* hci device pointer which binds to bt driver */
    + struct hci_dev *hdev;
    +
    + /* used locally,to maintain various BT driver status */
    + unsigned long flags;
    +
    + /* to hold ST registration callback status */
    + char streg_cbdata;
    +
    + /* write function pointer of ST driver */
    + long (*st_write) (struct sk_buff *);
    +
    + /* Wait on comepletion handler needed to synchronize
    + * hci_st_open() and hci_st_registration_completion_cb()
    + * functions.*/
    + struct completion wait_for_btdrv_reg_completion;
    +};
    +
    +#endif
    --
    1.5.4.3


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