--- /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 / linux-beck.git / commitdiff