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-/*
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- * Texas Instrument's Bluetooth Driver For Shared Transport.
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- *
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- * Bluetooth Driver acts as interface between HCI core and
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- * TI Shared Transport Layer.
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- *
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- * Copyright (C) 2009-2010 Texas Instruments
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- * Author: Raja Mani <raja_mani@ti.com>
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- * Pavan Savoy <pavan_savoy@ti.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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- *
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- */
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-
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-#include <linux/platform_device.h>
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-#include <net/bluetooth/bluetooth.h>
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-#include <net/bluetooth/hci_core.h>
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-
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-#include <linux/ti_wilink_st.h>
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-
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-/* Bluetooth Driver Version */
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-#define VERSION "1.0"
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-
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-/* Number of seconds to wait for registration completion
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- * when ST returns PENDING status.
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- */
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-#define BT_REGISTER_TIMEOUT 6000 /* 6 sec */
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-
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-/**
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- * struct ti_st - driver operation structure
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- * @hdev: hci device pointer which binds to bt driver
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- * @reg_status: ST registration callback status
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- * @st_write: write function provided by the ST driver
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- * to be used by the driver during send_frame.
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- * @wait_reg_completion - completion sync between ti_st_open
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- * and ti_st_registration_completion_cb.
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- */
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-struct ti_st {
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- struct hci_dev *hdev;
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- char reg_status;
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- long (*st_write) (struct sk_buff *);
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- struct completion wait_reg_completion;
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-};
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-
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-/* Increments HCI counters based on pocket ID (cmd,acl,sco) */
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-static inline void ti_st_tx_complete(struct ti_st *hst, int pkt_type)
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-{
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- struct hci_dev *hdev = hst->hdev;
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-
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- /* Update HCI stat counters */
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- switch (pkt_type) {
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- case HCI_COMMAND_PKT:
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- hdev->stat.cmd_tx++;
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- break;
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-
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- case HCI_ACLDATA_PKT:
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- hdev->stat.acl_tx++;
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- break;
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-
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- case HCI_SCODATA_PKT:
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- hdev->stat.sco_tx++;
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- break;
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- }
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-}
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-
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-/* ------- Interfaces to Shared Transport ------ */
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-
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-/* Called by ST layer to indicate protocol registration completion
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- * status.ti_st_open() function will wait for signal from this
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- * API when st_register() function returns ST_PENDING.
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- */
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-static void st_registration_completion_cb(void *priv_data, char data)
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-{
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- struct ti_st *lhst = priv_data;
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-
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- /* Save registration status for use in ti_st_open() */
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- lhst->reg_status = data;
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- /* complete the wait in ti_st_open() */
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- complete(&lhst->wait_reg_completion);
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-}
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-
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-/* Called by Shared Transport layer when receive data is
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- * available */
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-static long st_receive(void *priv_data, struct sk_buff *skb)
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-{
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- struct ti_st *lhst = priv_data;
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- int err;
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-
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- if (!skb)
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- return -EFAULT;
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-
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- if (!lhst) {
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- kfree_skb(skb);
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- return -EFAULT;
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- }
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-
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- skb->dev = (void *) lhst->hdev;
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-
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- /* Forward skb to HCI core layer */
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- err = hci_recv_frame(skb);
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- if (err < 0) {
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- BT_ERR("Unable to push skb to HCI core(%d)", err);
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- return err;
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- }
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-
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- lhst->hdev->stat.byte_rx += skb->len;
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-
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- return 0;
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-}
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-
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-/* ------- Interfaces to HCI layer ------ */
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-/* protocol structure registered with shared transport */
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-static struct st_proto_s ti_st_proto = {
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- .type = ST_BT,
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- .recv = st_receive,
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- .reg_complete_cb = st_registration_completion_cb,
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-};
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-
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-/* Called from HCI core to initialize the device */
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-static int ti_st_open(struct hci_dev *hdev)
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-{
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- unsigned long timeleft;
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- struct ti_st *hst;
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- int err;
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-
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- BT_DBG("%s %p", hdev->name, hdev);
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- if (test_and_set_bit(HCI_RUNNING, &hdev->flags)) {
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- BT_ERR("btwilink already opened");
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- return -EBUSY;
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- }
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-
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- /* provide contexts for callbacks from ST */
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- hst = hdev->driver_data;
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- ti_st_proto.priv_data = hst;
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-
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- err = st_register(&ti_st_proto);
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- if (err == -EINPROGRESS) {
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- /* ST is busy with either protocol registration or firmware
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- * download.
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- */
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- /* Prepare wait-for-completion handler data structures.
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- */
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- init_completion(&hst->wait_reg_completion);
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-
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- /* Reset ST registration callback status flag , this value
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- * will be updated in ti_st_registration_completion_cb()
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- * function whenever it called from ST driver.
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- */
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- hst->reg_status = -EINPROGRESS;
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-
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- BT_DBG("waiting for registration completion signal from ST");
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- timeleft = wait_for_completion_timeout
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- (&hst->wait_reg_completion,
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- msecs_to_jiffies(BT_REGISTER_TIMEOUT));
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- if (!timeleft) {
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- clear_bit(HCI_RUNNING, &hdev->flags);
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- BT_ERR("Timeout(%d sec),didn't get reg "
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- "completion signal from ST",
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- BT_REGISTER_TIMEOUT / 1000);
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- return -ETIMEDOUT;
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- }
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-
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- /* Is ST registration callback called with ERROR status? */
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- if (hst->reg_status != 0) {
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- clear_bit(HCI_RUNNING, &hdev->flags);
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- BT_ERR("ST registration completed with invalid "
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- "status %d", hst->reg_status);
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- return -EAGAIN;
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- }
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- err = 0;
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- } else if (err != 0) {
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- clear_bit(HCI_RUNNING, &hdev->flags);
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- BT_ERR("st_register failed %d", err);
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- return err;
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- }
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-
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- /* ti_st_proto.write is filled up by the underlying shared
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- * transport driver upon registration
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- */
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- hst->st_write = ti_st_proto.write;
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- if (!hst->st_write) {
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- BT_ERR("undefined ST write function");
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- clear_bit(HCI_RUNNING, &hdev->flags);
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-
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- /* Undo registration with ST */
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- err = st_unregister(ST_BT);
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- if (err)
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- BT_ERR("st_unregister() failed with error %d", err);
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-
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- hst->st_write = NULL;
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- return err;
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- }
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-
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- return err;
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-}
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-
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-/* Close device */
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-static int ti_st_close(struct hci_dev *hdev)
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-{
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- int err;
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- struct ti_st *hst = hdev->driver_data;
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-
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- if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
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- return 0;
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-
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- /* continue to unregister from transport */
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- err = st_unregister(ST_BT);
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- if (err)
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- BT_ERR("st_unregister() failed with error %d", err);
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-
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- hst->st_write = NULL;
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-
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- return err;
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-}
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-
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-static int ti_st_send_frame(struct sk_buff *skb)
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-{
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- struct hci_dev *hdev;
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- struct ti_st *hst;
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- long len;
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-
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- hdev = (struct hci_dev *)skb->dev;
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-
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- if (!test_bit(HCI_RUNNING, &hdev->flags))
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- return -EBUSY;
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-
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- hst = hdev->driver_data;
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-
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- /* Prepend skb with frame type */
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- memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
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-
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- BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type,
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- skb->len);
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-
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- /* Insert skb to shared transport layer's transmit queue.
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- * Freeing skb memory is taken care in shared transport layer,
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- * so don't free skb memory here.
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- */
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- len = hst->st_write(skb);
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- if (len < 0) {
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- kfree_skb(skb);
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- BT_ERR("ST write failed (%ld)", len);
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- /* Try Again, would only fail if UART has gone bad */
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- return -EAGAIN;
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- }
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-
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- /* ST accepted our skb. So, Go ahead and do rest */
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- hdev->stat.byte_tx += len;
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- ti_st_tx_complete(hst, bt_cb(skb)->pkt_type);
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-
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- return 0;
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-}
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-
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-static void ti_st_destruct(struct hci_dev *hdev)
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-{
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- BT_DBG("%s", hdev->name);
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- kfree(hdev->driver_data);
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-}
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-
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-static int bt_ti_probe(struct platform_device *pdev)
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-{
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- static struct ti_st *hst;
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- struct hci_dev *hdev;
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- int err;
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-
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- hst = kzalloc(sizeof(struct ti_st), GFP_KERNEL);
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- if (!hst)
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- return -ENOMEM;
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-
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- /* Expose "hciX" device to user space */
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- hdev = hci_alloc_dev();
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- if (!hdev) {
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- kfree(hst);
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- return -ENOMEM;
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- }
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-
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- BT_DBG("hdev %p", hdev);
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-
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- hst->hdev = hdev;
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- hdev->bus = HCI_UART;
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- hdev->driver_data = hst;
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- hdev->open = ti_st_open;
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- hdev->close = ti_st_close;
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- hdev->flush = NULL;
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- hdev->send = ti_st_send_frame;
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- hdev->destruct = ti_st_destruct;
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- hdev->owner = THIS_MODULE;
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-
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- err = hci_register_dev(hdev);
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- if (err < 0) {
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- BT_ERR("Can't register HCI device error %d", err);
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- kfree(hst);
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- hci_free_dev(hdev);
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- return err;
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- }
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-
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- BT_DBG("HCI device registered (hdev %p)", hdev);
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-
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- dev_set_drvdata(&pdev->dev, hst);
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- return err;
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-}
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-
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-static int bt_ti_remove(struct platform_device *pdev)
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-{
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- struct hci_dev *hdev;
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- struct ti_st *hst = dev_get_drvdata(&pdev->dev);
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-
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- if (!hst)
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- return -EFAULT;
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-
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- hdev = hst->hdev;
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- ti_st_close(hdev);
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- hci_unregister_dev(hdev);
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-
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- hci_free_dev(hdev);
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- kfree(hst);
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-
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- dev_set_drvdata(&pdev->dev, NULL);
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- return 0;
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-}
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-
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-static struct platform_driver btwilink_driver = {
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- .probe = bt_ti_probe,
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- .remove = bt_ti_remove,
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- .driver = {
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- .name = "btwilink",
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- .owner = THIS_MODULE,
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- },
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-};
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-
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-/* ------- Module Init/Exit interfaces ------ */
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-static int __init btwilink_init(void)
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-{
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- BT_INFO("Bluetooth Driver for TI WiLink - Version %s", VERSION);
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-
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- return platform_driver_register(&btwilink_driver);
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-}
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-
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-static void __exit btwilink_exit(void)
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-{
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- platform_driver_unregister(&btwilink_driver);
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-}
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-
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-module_init(btwilink_init);
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-module_exit(btwilink_exit);
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-
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-/* ------ Module Info ------ */
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-
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-MODULE_AUTHOR("Raja Mani <raja_mani@ti.com>");
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-MODULE_DESCRIPTION("Bluetooth Driver for TI Shared Transport" VERSION);
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-MODULE_VERSION(VERSION);
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-MODULE_LICENSE("GPL");
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Pavan Savoy