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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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