+++ /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) 2009-2010 Texas Instruments
- * Author: Raja Mani <raja_mani@ti.com>
- * Pavan Savoy <pavan_savoy@ti.com>
- *
- * 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 <linux/platform_device.h>
-#include <net/bluetooth/bluetooth.h>
-#include <net/bluetooth/hci_core.h>
-
-#include <linux/ti_wilink_st.h>
-
-/* Bluetooth Driver Version */
-#define VERSION "1.0"
-
-/* Number of seconds to wait for registration completion
- * when ST returns PENDING status.
- */
-#define BT_REGISTER_TIMEOUT 6000 /* 6 sec */
-
-/**
- * struct ti_st - driver operation structure
- * @hdev: hci device pointer which binds to bt driver
- * @reg_status: ST registration callback status
- * @st_write: write function provided by the ST driver
- * to be used by the driver during send_frame.
- * @wait_reg_completion - completion sync between ti_st_open
- * and ti_st_registration_completion_cb.
- */
-struct ti_st {
- struct hci_dev *hdev;
- char reg_status;
- long (*st_write) (struct sk_buff *);
- struct completion wait_reg_completion;
-};
-
-/* Increments HCI counters based on pocket ID (cmd,acl,sco) */
-static inline void ti_st_tx_complete(struct ti_st *hst, int pkt_type)
-{
- struct hci_dev *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.sco_tx++;
- break;
- }
-}
-
-/* ------- Interfaces to Shared Transport ------ */
-
-/* Called by ST layer to indicate protocol registration completion
- * status.ti_st_open() function will wait for signal from this
- * API when st_register() function returns ST_PENDING.
- */
-static void st_registration_completion_cb(void *priv_data, char data)
-{
- struct ti_st *lhst = priv_data;
-
- /* Save registration status for use in ti_st_open() */
- lhst->reg_status = data;
- /* complete the wait in ti_st_open() */
- complete(&lhst->wait_reg_completion);
-}
-
-/* Called by Shared Transport layer when receive data is
- * available */
-static long st_receive(void *priv_data, struct sk_buff *skb)
-{
- struct ti_st *lhst = priv_data;
- int err;
-
- if (!skb)
- return -EFAULT;
-
- if (!lhst) {
- kfree_skb(skb);
- return -EFAULT;
- }
-
- skb->dev = (void *) lhst->hdev;
-
- /* Forward skb to HCI core layer */
- err = hci_recv_frame(skb);
- if (err < 0) {
- BT_ERR("Unable to push skb to HCI core(%d)", err);
- return err;
- }
-
- lhst->hdev->stat.byte_rx += skb->len;
-
- return 0;
-}
-
-/* ------- Interfaces to HCI layer ------ */
-/* protocol structure registered with shared transport */
-static struct st_proto_s ti_st_proto = {
- .type = ST_BT,
- .recv = st_receive,
- .reg_complete_cb = st_registration_completion_cb,
-};
-
-/* Called from HCI core to initialize the device */
-static int ti_st_open(struct hci_dev *hdev)
-{
- unsigned long timeleft;
- struct ti_st *hst;
- int err;
-
- BT_DBG("%s %p", hdev->name, hdev);
- if (test_and_set_bit(HCI_RUNNING, &hdev->flags)) {
- BT_ERR("btwilink already opened");
- return -EBUSY;
- }
-
- /* provide contexts for callbacks from ST */
- hst = hdev->driver_data;
- ti_st_proto.priv_data = hst;
-
- err = st_register(&ti_st_proto);
- if (err == -EINPROGRESS) {
- /* ST is busy with either protocol registration or firmware
- * download.
- */
- /* Prepare wait-for-completion handler data structures.
- */
- init_completion(&hst->wait_reg_completion);
-
- /* Reset ST registration callback status flag , this value
- * will be updated in ti_st_registration_completion_cb()
- * function whenever it called from ST driver.
- */
- hst->reg_status = -EINPROGRESS;
-
- BT_DBG("waiting for registration completion signal from ST");
- timeleft = wait_for_completion_timeout
- (&hst->wait_reg_completion,
- msecs_to_jiffies(BT_REGISTER_TIMEOUT));
- if (!timeleft) {
- clear_bit(HCI_RUNNING, &hdev->flags);
- BT_ERR("Timeout(%d sec),didn't get reg "
- "completion signal from ST",
- BT_REGISTER_TIMEOUT / 1000);
- return -ETIMEDOUT;
- }
-
- /* Is ST registration callback called with ERROR status? */
- if (hst->reg_status != 0) {
- clear_bit(HCI_RUNNING, &hdev->flags);
- BT_ERR("ST registration completed with invalid "
- "status %d", hst->reg_status);
- return -EAGAIN;
- }
- err = 0;
- } else if (err != 0) {
- clear_bit(HCI_RUNNING, &hdev->flags);
- BT_ERR("st_register failed %d", err);
- return err;
- }
-
- /* ti_st_proto.write is filled up by the underlying shared
- * transport driver upon registration
- */
- hst->st_write = ti_st_proto.write;
- if (!hst->st_write) {
- BT_ERR("undefined ST write function");
- clear_bit(HCI_RUNNING, &hdev->flags);
-
- /* Undo registration with ST */
- err = st_unregister(ST_BT);
- if (err)
- BT_ERR("st_unregister() failed with error %d", err);
-
- hst->st_write = NULL;
- return err;
- }
-
- return err;
-}
-
-/* Close device */
-static int ti_st_close(struct hci_dev *hdev)
-{
- int err;
- struct ti_st *hst = hdev->driver_data;
-
- if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
- return 0;
-
- /* continue to unregister from transport */
- err = st_unregister(ST_BT);
- if (err)
- BT_ERR("st_unregister() failed with error %d", err);
-
- hst->st_write = NULL;
-
- return err;
-}
-
-static int ti_st_send_frame(struct sk_buff *skb)
-{
- struct hci_dev *hdev;
- struct ti_st *hst;
- long len;
-
- hdev = (struct hci_dev *)skb->dev;
-
- if (!test_bit(HCI_RUNNING, &hdev->flags))
- return -EBUSY;
-
- hst = hdev->driver_data;
-
- /* Prepend skb with frame type */
- memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
-
- BT_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.
- */
- len = hst->st_write(skb);
- if (len < 0) {
- kfree_skb(skb);
- BT_ERR("ST write failed (%ld)", len);
- /* Try Again, would only fail if UART has gone bad */
- return -EAGAIN;
- }
-
- /* ST accepted our skb. So, Go ahead and do rest */
- hdev->stat.byte_tx += len;
- ti_st_tx_complete(hst, bt_cb(skb)->pkt_type);
-
- return 0;
-}
-
-static void ti_st_destruct(struct hci_dev *hdev)
-{
- BT_DBG("%s", hdev->name);
- kfree(hdev->driver_data);
-}
-
-static int bt_ti_probe(struct platform_device *pdev)
-{
- static struct ti_st *hst;
- struct hci_dev *hdev;
- int err;
-
- hst = kzalloc(sizeof(struct ti_st), GFP_KERNEL);
- if (!hst)
- return -ENOMEM;
-
- /* Expose "hciX" device to user space */
- hdev = hci_alloc_dev();
- if (!hdev) {
- kfree(hst);
- return -ENOMEM;
- }
-
- BT_DBG("hdev %p", hdev);
-
- hst->hdev = hdev;
- hdev->bus = HCI_UART;
- hdev->driver_data = hst;
- hdev->open = ti_st_open;
- hdev->close = ti_st_close;
- hdev->flush = NULL;
- hdev->send = ti_st_send_frame;
- hdev->destruct = ti_st_destruct;
- hdev->owner = THIS_MODULE;
-
- err = hci_register_dev(hdev);
- if (err < 0) {
- BT_ERR("Can't register HCI device error %d", err);
- kfree(hst);
- hci_free_dev(hdev);
- return err;
- }
-
- BT_DBG("HCI device registered (hdev %p)", hdev);
-
- dev_set_drvdata(&pdev->dev, hst);
- return err;
-}
-
-static int bt_ti_remove(struct platform_device *pdev)
-{
- struct hci_dev *hdev;
- struct ti_st *hst = dev_get_drvdata(&pdev->dev);
-
- if (!hst)
- return -EFAULT;
-
- hdev = hst->hdev;
- ti_st_close(hdev);
- hci_unregister_dev(hdev);
-
- hci_free_dev(hdev);
- kfree(hst);
-
- dev_set_drvdata(&pdev->dev, NULL);
- return 0;
-}
-
-static struct platform_driver btwilink_driver = {
- .probe = bt_ti_probe,
- .remove = bt_ti_remove,
- .driver = {
- .name = "btwilink",
- .owner = THIS_MODULE,
- },
-};
-
-/* ------- Module Init/Exit interfaces ------ */
-static int __init btwilink_init(void)
-{
- BT_INFO("Bluetooth Driver for TI WiLink - Version %s", VERSION);
-
- return platform_driver_register(&btwilink_driver);
-}
-
-static void __exit btwilink_exit(void)
-{
- platform_driver_unregister(&btwilink_driver);
-}
-
-module_init(btwilink_init);
-module_exit(btwilink_exit);
-
-/* ------ Module Info ------ */
-
-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 / LineageOS / G12 / android_kernel_amlogic_linux-4.9.git / commitdiff