+++ /dev/null
-/*
- * 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 <linux/ti_wilink_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(void *priv_data, char data)
-{
- struct hci_st *lhst = (struct hci_st *)priv_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.
- */
- lhst->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(&lhst->wait_for_btdrv_reg_completion);
-
- BTDRV_API_EXIT(0);
-}
-
-/* Called by Shared Transport layer when receive data is
- * available */
-static long hci_st_receive(void *priv_data, struct sk_buff *skb)
-{
- int err;
- int len;
- struct hci_st *lhst = (struct hci_st *)priv_data;
-
- 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 (!lhst) {
- kfree_skb(skb);
- BT_DRV_ERR("Invalid hci_st memory,freeing SKB");
- BTDRV_API_EXIT(-EFAULT);
- return -EFAULT;
- }
- if (!test_bit(BT_DRV_RUNNING, &lhst->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 *)lhst->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;
- }
- lhst->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;
-
- /* send in the hst to be received at registration complete callback
- * and during st's receive
- */
- hci_st_proto.priv_data = hst;
-
- /* Register with ST layer */
- err = st_register(&hci_st_proto);
- if (err == -EINPROGRESS) {
- /* 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 == -1) {
- 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 != 0) {
- 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");
projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / commitdiff