This patch adds support for using the ST-Ericsson CG2900
connectivity controller as a driver for the BlueZ Bluetooth
stack.
This patch registers as a driver into the BlueZ framework and, when
opened by BlueZ, it registers as user for bt_cmd, bt_acl, and bt_evt
channels.
Signed-off-by: Par-Gunnar Hjalmdahl <par-gunnar.p.hjalmdahl@xxxxxxxxxxxxxx>
---
drivers/bluetooth/Kconfig | 7 +
drivers/bluetooth/Makefile | 2 +
drivers/bluetooth/cg2900_hci.c | 896 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 905 insertions(+), 0 deletions(-)
create mode 100644 drivers/bluetooth/cg2900_hci.c
diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index 02deef4..9ca8d69 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -219,4 +219,11 @@ config BT_ATH3K
Say Y here to compile support for "Atheros firmware download driver"
into the kernel or say M to compile it as module (ath3k).
+config BT_CG2900
+ tristate "ST-Ericsson CG2900 driver"
+ depends on MFD_CG2900 && BT
+ help
+ Select if ST-Ericsson CG2900 Connectivity controller shall be used as
+ Bluetooth controller for BlueZ.
+
endmenu
diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
index 71bdf13..a479c16 100644
--- a/drivers/bluetooth/Makefile
+++ b/drivers/bluetooth/Makefile
@@ -19,6 +19,8 @@ obj-$(CONFIG_BT_ATH3K) += ath3k.o
obj-$(CONFIG_BT_MRVL) += btmrvl.o
obj-$(CONFIG_BT_MRVL_SDIO) += btmrvl_sdio.o
+obj-$(CONFIG_BT_CG2900) += cg2900_hci.o
+
btmrvl-y := btmrvl_main.o
btmrvl-$(CONFIG_DEBUG_FS) += btmrvl_debugfs.o
diff --git a/drivers/bluetooth/cg2900_hci.c b/drivers/bluetooth/cg2900_hci.c
new file mode 100644
index 0000000..de1ada8
--- /dev/null
+++ b/drivers/bluetooth/cg2900_hci.c
@@ -0,0 +1,896 @@
+/*
+ * drivers/bluetooth/cg2900_hci.c
+ *
+ * Copyright (C) ST-Ericsson SA 2010
+ * Authors:
+ * Par-Gunnar Hjalmdahl (par-gunnar.p.hjalmdahl@xxxxxxxxxxxxxx) for
ST-Ericsson.
+ * Henrik Possung (henrik.possung@xxxxxxxxxxxxxx) for ST-Ericsson.
+ * Josef Kindberg (josef.kindberg@xxxxxxxxxxxxxx) for ST-Ericsson.
+ * Dariusz Szymszak (dariusz.xd.szymczak@xxxxxxxxxxxxxx) for ST-Ericsson.
+ * Kjell Andersson (kjell.k.andersson@xxxxxxxxxxxxxx) for ST-Ericsson.
+ * License terms: GNU General Public License (GPL), version 2
+ *
+ * Linux Bluetooth HCI H:4 Driver for ST-Ericsson CG2900 connectivity
controller
+ * towards the BlueZ Bluetooth stack.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/skbuff.h>
+#include <asm/byteorder.h>
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci.h>
+#include <net/bluetooth/hci_core.h>
+
+#include <linux/workqueue.h>
+#include <linux/wait.h>
+#include <linux/time.h>
+#include <linux/jiffies.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+
+#include <linux/mfd/cg2900.h>
+#include <mach/cg2900_devices.h>
+
+/* module_param declared in cg2900_core.c */
+extern int cg2900_debug_level;
+
+#define NAME "CG2900 HCI"
+
+/* Debug defines */
+#define CG2900_DBG_DATA(fmt, arg...) \
+do { \
+ if (cg2900_debug_level >= 25) \
+ printk(KERN_DEBUG NAME " %s: " fmt "\n" , __func__ , ## arg); \
+} while (0)
+
+#define CG2900_DBG(fmt, arg...) \
+do { \
+ if (cg2900_debug_level >= 20) \
+ printk(KERN_DEBUG NAME " %s: " fmt "\n" , __func__ , ## arg); \
+} while (0)
+
+#define CG2900_INFO(fmt, arg...) \
+do { \
+ if (cg2900_debug_level >= 10) \
+ printk(KERN_INFO NAME ": " fmt "\n" , ## arg); \
+} while (0)
+
+#define CG2900_ERR(fmt, arg...) \
+do { \
+ if (cg2900_debug_level >= 1) \
+ printk(KERN_ERR NAME " %s: " fmt "\n" , __func__ , ## arg); \
+} while (0)
+
+#define CG2900_SET_STATE(__name, __var, __new_state) \
+do { \
+ CG2900_DBG("New %s: 0x%X", __name, (uint32_t)__new_state); \
+ __var = __new_state; \
+} while (0)
+
+/* HCI device type */
+#define HCI_CG2900 HCI_VIRTUAL
+
+/* Wait for 5 seconds for a response to our requests */
+#define RESP_TIMEOUT 5000
+
+/* State-setting defines */
+#define SET_RESET_STATE(__hci_reset_new_state) \
+ CG2900_SET_STATE("reset_state", hci_info->reset_state, \
+ __hci_reset_new_state)
+#define SET_ENABLE_STATE(__hci_enable_new_state) \
+ CG2900_SET_STATE("enable_state", hci_info->enable_state, \
+ __hci_enable_new_state)
+
+/* Bluetooth error codes */
+#define HCI_ERR_NO_ERROR 0x00
+#define HCI_ERR_CMD_DISALLOWED 0x0C
+
+/**
+ * enum reset_state - RESET-states of the HCI driver.
+ *
+ * @RESET_IDLE: No reset in progress.
+ * @RESET_ACTIVATED: Reset in progress.
+ * @RESET_UNREGISTERED: hdev is unregistered.
+ */
+
+enum reset_state {
+ RESET_IDLE,
+ RESET_ACTIVATED,
+ RESET_UNREGISTERED
+};
+
+/**
+ * enum enable_state - ENABLE-states of the HCI driver.
+ *
+ * @ENABLE_IDLE: The HCI driver is loaded but not opened.
+ * @ENABLE_WAITING_BT_ENABLED_CC: The HCI driver is waiting for a command
+ * complete event from the BT chip as a
+ * response to a BT Enable (true) command.
+ * @ENABLE_BT_ENABLED: The BT chip is enabled.
+ * @ENABLE_WAITING_BT_DISABLED_CC: The HCI driver is waiting for a command
+ * complete event from the BT chip as a
+ * response to a BT Enable (false) command.
+ * @ENABLE_BT_DISABLED: The BT chip is disabled.
+ * @ENABLE_BT_ERROR: The HCI driver is in a bad state, some
+ * thing has failed and is not expected to
+ * work properly.
+ */
+enum enable_state {
+ ENABLE_IDLE,
+ ENABLE_WAITING_BT_ENABLED_CC,
+ ENABLE_BT_ENABLED,
+ ENABLE_WAITING_BT_DISABLED_CC,
+ ENABLE_BT_DISABLED,
+ ENABLE_BT_ERROR
+};
+
+/**
+ * struct hci_info - Specifies HCI driver private data.
+ *
+ * This type specifies CG2900 HCI driver private data.
+ *
+ * @bt_cmd: Device structure for BT command channel.
+ * @bt_evt: Device structure for BT event channel.
+ * @bt_acl: Device structure for BT ACL channel.
+ * @hdev: Device structure for HCI device.
+ * @reset_state: Device enum for HCI driver reset state.
+ * @enable_state: Device enum for HCI driver BT enable state.
+ */
+struct hci_info {
+ struct cg2900_device *bt_cmd;
+ struct cg2900_device *bt_evt;
+ struct cg2900_device *bt_acl;
+ struct hci_dev *hdev;
+ enum reset_state reset_state;
+ enum enable_state enable_state;
+};
+
+/**
+ * struct dev_info - Specifies private data used when receiving
callbacks from CPD.
+ *
+ * @hdev: Device structure for HCI device.
+ * @hci_data_type: Type of data according to BlueZ.
+ */
+struct dev_info {
+ struct hci_dev *hdev;
+ u8 hci_data_type;
+};
+
+/* Variables where LSB and MSB for bt_enable command is stored */
+static u16 bt_enable_cmd;
+
+static struct hci_info *hci_info;
+
+/*
+ * hci_wait_queue - Main Wait Queue in HCI driver.
+ */
+static DECLARE_WAIT_QUEUE_HEAD(hci_wait_queue);
+
+/* Internal function declarations */
+static int register_to_bluez(void);
+
+/* Internal functions */
+
+/**
+ * remove_bt_users() - Unregister and remove any existing BT users.
+ * @info: HCI driver info structure.
+ */
+static void remove_bt_users(struct hci_info *info)
+{
+ if (info->bt_cmd) {
+ kfree(info->bt_cmd->user_data);
+ info->bt_cmd->user_data = NULL;
+ cg2900_deregister_user(info->bt_cmd);
+ info->bt_cmd = NULL;
+ }
+
+ if (info->bt_evt) {
+ kfree(info->bt_evt->user_data);
+ info->bt_evt->user_data = NULL;
+ cg2900_deregister_user(info->bt_evt);
+ info->bt_evt = NULL;
+ }
+
+ if (info->bt_acl) {
+ kfree(info->bt_acl->user_data);
+ info->bt_acl->user_data = NULL;
+ cg2900_deregister_user(info->bt_acl);
+ info->bt_acl = NULL;
+ }
+}
+
+/**
+ * hci_read_cb() - Callback for handling data received from CG2900 driver.
+ * @dev: Device receiving data.
+ * @skb: Buffer with data coming from device.
+ */
+static void hci_read_cb(struct cg2900_device *dev, struct sk_buff *skb)
+{
+ int err = 0;
+ struct dev_info *dev_info;
+ struct hci_event_hdr *evt;
+ struct hci_ev_cmd_complete *cmd_complete;
+ struct hci_ev_cmd_status *cmd_status;
+ u8 status;
+
+ if (!skb) {
+ CG2900_ERR("NULL supplied for skb");
+ return;
+ }
+
+ if (!dev) {
+ CG2900_ERR("dev == NULL");
+ goto fin_free_skb;
+ }
+
+ dev_info = (struct dev_info *)dev->user_data;
+
+ if (!dev_info) {
+ CG2900_ERR("dev_info == NULL");
+ goto fin_free_skb;
+ }
+
+ evt = (struct hci_event_hdr *)skb->data;
+ cmd_complete = (struct hci_ev_cmd_complete *)(skb->data + sizeof(*evt));
+ cmd_status = (struct hci_ev_cmd_status *)(skb->data + sizeof(*evt));
+
+ /*
+ * Check if HCI Driver it self is expecting a Command Complete packet
+ * from the chip after a BT Enable command.
+ */
+ if ((hci_info->enable_state == ENABLE_WAITING_BT_ENABLED_CC ||
+ hci_info->enable_state == ENABLE_WAITING_BT_DISABLED_CC) &&
+ hci_info->bt_evt->h4_channel == dev->h4_channel &&
+ evt->evt == HCI_EV_CMD_COMPLETE &&
+ le16_to_cpu(cmd_complete->opcode) == bt_enable_cmd) {
+ /*
+ * This is the command complete event for
+ * the HCI_Cmd_VS_Bluetooth_Enable.
+ * Check result and update state.
+ *
+ * The BT chip is enabled/disabled. Either it was enabled/
+ * disabled now (status NO_ERROR) or it was already enabled/
+ * disabled (assuming status CMD_DISALLOWED is already enabled/
+ * disabled).
+ */
+ status = *(skb->data + sizeof(*evt) + sizeof(*cmd_complete));
+ if (status != HCI_ERR_NO_ERROR &&
+ status != HCI_ERR_CMD_DISALLOWED) {
+ CG2900_ERR("Could not enable/disable BT core (0x%X)",
+ status);
+ SET_ENABLE_STATE(ENABLE_BT_ERROR);
+ goto fin_free_skb;
+ }
+
+ if (hci_info->enable_state == ENABLE_WAITING_BT_ENABLED_CC) {
+ SET_ENABLE_STATE(ENABLE_BT_ENABLED);
+ CG2900_INFO("BT core is enabled");
+ } else {
+ SET_ENABLE_STATE(ENABLE_BT_DISABLED);
+ CG2900_INFO("BT core is disabled");
+ }
+
+ /* Wake up whom ever is waiting for this result. */
+ wake_up_interruptible(&hci_wait_queue);
+ goto fin_free_skb;
+ } else if ((hci_info->enable_state == ENABLE_WAITING_BT_DISABLED_CC ||
+ hci_info->enable_state == ENABLE_WAITING_BT_ENABLED_CC) &&
+ hci_info->bt_evt->h4_channel == dev->h4_channel &&
+ evt->evt == HCI_EV_CMD_STATUS &&
+ le16_to_cpu(cmd_status->opcode) == bt_enable_cmd) {
+ /*
+ * Clear the status events since the Bluez is not expecting
+ * them.
+ */
+ CG2900_DBG("HCI Driver received Command Status(for "
+ "BT enable): 0x%X", cmd_status->status);
+ /*
+ * This is the command status event for
+ * the HCI_Cmd_VS_Bluetooth_Enable.
+ * Just free the packet.
+ */
+ goto fin_free_skb;
+ } else {
+ bt_cb(skb)->pkt_type = dev_info->hci_data_type;
+ skb->dev = (struct net_device *)dev_info->hdev;
+ /* Update BlueZ stats */
+ dev_info->hdev->stat.byte_rx += skb->len;
+ if (bt_cb(skb)->pkt_type == HCI_ACLDATA_PKT)
+ dev_info->hdev->stat.acl_rx++;
+ else
+ dev_info->hdev->stat.evt_rx++;
+
+ CG2900_DBG_DATA("Data receive %d bytes", skb->len);
+
+ /* Provide BlueZ with received frame*/
+ err = hci_recv_frame(skb);
+ /* If err, skb have been freed in hci_recv_frame() */
+ if (err)
+ CG2900_ERR("Failed in supplying packet to BlueZ (%d)",
+ err);
+ }
+
+ return;
+
+fin_free_skb:
+ kfree_skb(skb);
+}
+
+/**
+ * hci_reset_cb() - Callback for handling reset from CG2900 driver.
+ * @dev: CPD device resetting.
+ */
+static void hci_reset_cb(struct cg2900_device *dev)
+{
+ int err;
+ struct hci_dev *hdev;
+ struct dev_info *dev_info;
+ struct hci_info *info;
+
+ CG2900_INFO("BluezDriver: hci_reset_cb");
+
+ if (!dev) {
+ CG2900_ERR("NULL supplied for dev");
+ return;
+ }
+
+ dev_info = (struct dev_info *)dev->user_data;
+ if (!dev_info) {
+ CG2900_ERR("NULL supplied for dev_info");
+ return;
+ }
+
+ hdev = dev_info->hdev;
+ if (!hdev) {
+ CG2900_ERR("NULL supplied for hdev");
+ return;
+ }
+
+ info = (struct hci_info *)hdev->driver_data;
+ if (!info) {
+ CG2900_ERR("NULL supplied for driver_data");
+ return;
+ }
+
+ switch (dev_info->hci_data_type) {
+
+ case HCI_EVENT_PKT:
+ info->bt_evt = NULL;
+ break;
+
+ case HCI_COMMAND_PKT:
+ info->bt_cmd = NULL;
+ break;
+
+ case HCI_ACLDATA_PKT:
+ info->bt_acl = NULL;
+ break;
+
+ default:
+ CG2900_ERR("Unknown HCI data type:%d",
+ dev_info->hci_data_type);
+ return;
+ }
+
+ SET_RESET_STATE(RESET_ACTIVATED);
+
+ /* Free userdata as device info structure will be freed by CG2900
+ * when this callback returns */
+ kfree(dev->user_data);
+ dev->user_data = NULL;
+
+ /*
+ * Continue to deregister hdev if all channels has been reset else
+ * return.
+ */
+ if (info->bt_evt || info->bt_cmd || info->bt_acl)
+ return;
+
+ /*
+ * Deregister HCI device. Close and Destruct functions should
+ * in turn be called by BlueZ.
+ */
+ CG2900_INFO("Deregister HCI device");
+ err = hci_unregister_dev(hdev);
+ if (err)
+ CG2900_ERR("Can not deregister HCI device! (%d)", err);
+ /*
+ * Now we are in trouble. Try to register a new hdev
+ * anyway even though this will cost some memory.
+ */
+
+ wait_event_interruptible_timeout(hci_wait_queue,
+ (RESET_UNREGISTERED == hci_info->reset_state),
+ msecs_to_jiffies(RESP_TIMEOUT));
+ if (RESET_UNREGISTERED != hci_info->reset_state)
+ /*
+ * Now we are in trouble. Try to register a new hdev
+ * anyway even though this will cost some memory.
+ */
+ CG2900_ERR("Timeout expired. Could not deregister HCI device");
+
+ /* Init and register hdev */
+ CG2900_INFO("Register HCI device");
+ err = register_to_bluez();
+ if (err)
+ CG2900_ERR("HCI Device registration error (%d).", err);
+}
+
+/*
+ * struct cg2900_cb - Specifies callback structure for CG2900 user.
+ *
+ * @read_cb: Callback function called when data is received from
+ * the controller.
+ * @reset_cb: Callback function called when the controller has been reset.
+ */
+static struct cg2900_callbacks cg2900_cb = {
+ .read_cb = hci_read_cb,
+ .reset_cb = hci_reset_cb
+};
+
+/**
+ * open_from_hci() - Open HCI interface.
+ * @hdev: HCI device being opened.
+ *
+ * BlueZ callback function for opening HCI interface to device.
+ *
+ * Returns:
+ * 0 if there is no error.
+ * -EINVAL if NULL pointer is supplied.
+ * -EOPNOTSUPP if supplied packet type is not supported.
+ * -EBUSY if device is already opened.
+ * -EACCES if opening of channels failed.
+ */
+static int open_from_hci(struct hci_dev *hdev)
+{
+ struct hci_info *info;
+ struct dev_info *dev_info;
+ struct sk_buff *enable_cmd;
+ int err;
+
+ CG2900_INFO("Open ST-Ericsson connectivity HCI driver");
+
+ if (!hdev) {
+ CG2900_ERR("NULL supplied for hdev");
+ return -EINVAL;
+ }
+
+ info = (struct hci_info *)hdev->driver_data;
+ if (!info) {
+ CG2900_ERR("NULL supplied for driver_data");
+ return -EINVAL;
+ }
+
+ if (test_and_set_bit(HCI_RUNNING, &(hdev->flags))) {
+ CG2900_ERR("Device already opened!");
+ return -EBUSY;
+ }
+
+ if (!(info->bt_cmd)) {
+ info->bt_cmd = cg2900_register_user(CG2900_BT_CMD,
+ &cg2900_cb);
+ if (info->bt_cmd) {
+ dev_info = kmalloc(sizeof(*dev_info), GFP_KERNEL);
+ if (dev_info) {
+ dev_info->hdev = hdev;
+ dev_info->hci_data_type = HCI_COMMAND_PKT;
+ }
+ info->bt_cmd->user_data = dev_info;
+ } else {
+ CG2900_ERR("Couldn't register CG2900_BT_CMD to CG2900");
+ err = -EACCES;
+ goto handle_error;
+ }
+ }
+
+ if (!(info->bt_evt)) {
+ info->bt_evt = cg2900_register_user(CG2900_BT_EVT,
+ &cg2900_cb);
+ if (info->bt_evt) {
+ dev_info = kmalloc(sizeof(*dev_info), GFP_KERNEL);
+ if (dev_info) {
+ dev_info->hdev = hdev;
+ dev_info->hci_data_type = HCI_EVENT_PKT;
+ }
+ info->bt_evt->user_data = dev_info;
+ } else {
+ CG2900_ERR("Couldn't register CG2900_BT_EVT to CG2900");
+ err = -EACCES;
+ goto handle_error;
+ }
+ }
+
+ if (!(info->bt_acl)) {
+ info->bt_acl = cg2900_register_user(CG2900_BT_ACL,
+ &cg2900_cb);
+ if (info->bt_acl) {
+ dev_info = kmalloc(sizeof(*dev_info), GFP_KERNEL);
+ if (dev_info) {
+ dev_info->hdev = hdev;
+ dev_info->hci_data_type = HCI_ACLDATA_PKT;
+ }
+ info->bt_acl->user_data = dev_info;
+ } else {
+ CG2900_ERR("Couldn't register CG2900_BT_ACL to CG2900");
+ err = -EACCES;
+ goto handle_error;
+ }
+ }
+
+ if (info->reset_state == RESET_ACTIVATED)
+ SET_RESET_STATE(RESET_IDLE);
+
+ /*
+ * Call platform specific function that returns the chip dependent
+ * bt enable(true) HCI command.
+ * If NULL is returned, then no bt_enable command should be sent to the
+ * chip.
+ */
+ enable_cmd = cg2900_devices_get_bt_enable_cmd(&bt_enable_cmd, true);
+ if (!enable_cmd) {
+ /* The chip is enabled by default */
+ SET_ENABLE_STATE(ENABLE_BT_ENABLED);
+ return 0;
+ }
+
+ /* Set the HCI state before sending command to chip. */
+ SET_ENABLE_STATE(ENABLE_WAITING_BT_ENABLED_CC);
+
+ /* Send command to chip */
+ cg2900_write(info->bt_cmd, enable_cmd);
+
+ /*
+ * Wait for callback to receive command complete and then wake us up
+ * again.
+ */
+ wait_event_interruptible_timeout(hci_wait_queue,
+ (info->enable_state == ENABLE_BT_ENABLED),
+ msecs_to_jiffies(RESP_TIMEOUT));
+ /* Check the current state to se that it worked. */
+ if (info->enable_state != ENABLE_BT_ENABLED) {
+ CG2900_ERR("Could not enable BT core (%d)", info->enable_state);
+ err = -EACCES;
+ SET_ENABLE_STATE(ENABLE_BT_DISABLED);
+ goto handle_error;
+ }
+
+ return 0;
+
+handle_error:
+ remove_bt_users(info);
+ clear_bit(HCI_RUNNING, &(hdev->flags));
+ return err;
+
+}
+
+/**
+ * flush_from_hci() - Flush HCI interface.
+ * @hdev: HCI device being flushed.
+ *
+ * Returns:
+ * 0 if there is no error.
+ * -EINVAL if NULL pointer is supplied.
+ */
+static int flush_from_hci(struct hci_dev *hdev)
+{
+ CG2900_INFO("flush_from_hci");
+
+ if (!hdev) {
+ CG2900_ERR("NULL supplied for hdev");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/**
+ * close_from_hci() - Close HCI interface.
+ * @hdev: HCI device being closed.
+ *
+ * BlueZ callback function for closing HCI interface.
+ * It flushes the interface first.
+ *
+ * Returns:
+ * 0 if there is no error.
+ * -EINVAL if NULL pointer is supplied.
+ * -EOPNOTSUPP if supplied packet type is not supported.
+ * -EBUSY if device is not opened.
+ */
+static int close_from_hci(struct hci_dev *hdev)
+{
+ struct hci_info *info = NULL;
+ struct sk_buff *enable_cmd;
+
+ CG2900_INFO("close_from_hci");
+
+ if (!hdev) {
+ CG2900_ERR("NULL supplied for hdev");
+ return -EINVAL;
+ }
+
+ info = (struct hci_info *)hdev->driver_data;
+ if (!info) {
+ CG2900_ERR("NULL supplied for driver_data");
+ return -EINVAL;
+ }
+
+ if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags))) {
+ CG2900_ERR("Device already closed!");
+ return -EBUSY;
+ }
+
+ flush_from_hci(hdev);
+
+ /* Do not do this if there is an reset ongoing */
+ if (hci_info->reset_state == RESET_ACTIVATED)
+ goto remove_users;
+
+ /*
+ * Get the chip dependent BT Enable HCI command. The command parameter
+ * shall be set to false to disable the BT core.
+ * If NULL is returned, then no BT Enable command should be sent to the
+ * chip.
+ */
+ enable_cmd = cg2900_devices_get_bt_enable_cmd(&bt_enable_cmd, false);
+ if (!enable_cmd) {
+ /*
+ * The chip is enabled by default and we should not disable it.
+ */
+ SET_ENABLE_STATE(ENABLE_BT_ENABLED);
+ goto remove_users;
+ }
+
+ /* Set the HCI state before sending command to chip */
+ SET_ENABLE_STATE(ENABLE_WAITING_BT_DISABLED_CC);
+
+ /* Send command to chip */
+ cg2900_write(info->bt_cmd, enable_cmd);
+
+ /*
+ * Wait for callback to receive command complete and then wake us up
+ * again.
+ */
+ wait_event_interruptible_timeout(hci_wait_queue,
+ (info->enable_state == ENABLE_BT_DISABLED),
+ msecs_to_jiffies(RESP_TIMEOUT));
+ /* Check the current state to se that it worked. */
+ if (info->enable_state != ENABLE_BT_DISABLED) {
+ CG2900_ERR("Could not disable BT core.");
+ SET_ENABLE_STATE(ENABLE_BT_ENABLED);
+ }
+
+remove_users:
+ /* Finally deregister all users and free allocated data */
+ remove_bt_users(info);
+ return 0;
+}
+
+/**
+ * send_from_hci() - Send packet to device.
+ * @skb: sk buffer to be sent.
+ *
+ * BlueZ callback function for sending sk buffer.
+ *
+ * Returns:
+ * 0 if there is no error.
+ * -EINVAL if NULL pointer is supplied.
+ * -EOPNOTSUPP if supplied packet type is not supported.
+ * Error codes from cg2900_write.
+ */
+static int send_from_hci(struct sk_buff *skb)
+{
+ struct hci_dev *hdev;
+ struct hci_info *info;
+ int err = 0;
+
+ if (!skb) {
+ CG2900_ERR("NULL supplied for skb");
+ return -EINVAL;
+ }
+
+ hdev = (struct hci_dev *)(skb->dev);
+ if (!hdev) {
+ CG2900_ERR("NULL supplied for hdev");
+ return -EINVAL;
+ }
+
+ info = (struct hci_info *)hdev->driver_data;
+ if (!info) {
+ CG2900_ERR("NULL supplied for info");
+ return -EINVAL;
+ }
+
+ /* Update BlueZ stats */
+ hdev->stat.byte_tx += skb->len;
+
+ CG2900_DBG_DATA("Data transmit %d bytes", skb->len);
+
+ switch (bt_cb(skb)->pkt_type) {
+ case HCI_COMMAND_PKT:
+ CG2900_DBG("Sending HCI_COMMAND_PKT");
+ err = cg2900_write(info->bt_cmd, skb);
+ hdev->stat.cmd_tx++;
+ break;
+ case HCI_ACLDATA_PKT:
+ CG2900_DBG("Sending HCI_ACLDATA_PKT");
+ err = cg2900_write(info->bt_acl, skb);
+ hdev->stat.acl_tx++;
+ break;
+ default:
+ CG2900_ERR("Trying to transmit unsupported packet type "
+ "(0x%.2X)", bt_cb(skb)->pkt_type);
+ err = -EOPNOTSUPP;
+ break;
+ };
+
+ return err;
+}
+
+/**
+ * destruct_from_hci() - Destruct HCI interface.
+ * @hdev: HCI device being destructed.
+ */
+static void destruct_from_hci(struct hci_dev *hdev)
+{
+ CG2900_INFO("destruct_from_hci");
+
+ if (!hci_info)
+ return;
+
+ /* When being reset, register a new hdev when hdev is deregistered */
+ if (hci_info->reset_state == RESET_ACTIVATED) {
+ if (hci_info->hdev)
+ hci_free_dev(hci_info->hdev);
+ SET_RESET_STATE(RESET_UNREGISTERED);
+ }
+}
+
+/**
+ * notify_from_hci() - Notification from the HCI interface.
+ * @hdev: HCI device notifying.
+ * @evt: Notification event.
+ */
+static void notify_from_hci(struct hci_dev *hdev, unsigned int evt)
+{
+ CG2900_INFO("notify_from_hci - evt = 0x%.2X", evt);
+}
+
+/**
+ * ioctl_from_hci() - Handle IOCTL call to the HCI interface.
+ * @hdev: HCI device.
+ * @cmd: IOCTL command.
+ * @arg: IOCTL argument.
+ *
+ * Returns:
+ * -EINVAL if NULL is supplied for hdev.
+ * -EPERM otherwise since current driver supports no IOCTL.
+ */
+static int ioctl_from_hci(struct hci_dev *hdev, unsigned int cmd,
+ unsigned long arg)
+{
+ CG2900_INFO("ioctl_from_hci - cmd 0x%X", cmd);
+ CG2900_DBG("DIR: %d, TYPE: %d, NR: %d, SIZE: %d",
+ _IOC_DIR(cmd), _IOC_TYPE(cmd), _IOC_NR(cmd),
+ _IOC_SIZE(cmd));
+
+ if (!hdev) {
+ CG2900_ERR("NULL supplied for hdev");
+ return -EINVAL;;
+ }
+
+ return -EPERM;
+}
+
+/**
+ * register_to_bluez() - Initialize module.
+ *
+ * Alloc, init, and register HCI device to BlueZ.
+ *
+ * Returns:
+ * 0 if there is no error.
+ * -ENOMEM if allocation fails.
+ * Error codes from hci_register_dev.
+ */
+static int register_to_bluez(void)
+{
+ int err;
+
+ hci_info->hdev = hci_alloc_dev();
+ if (!hci_info->hdev) {
+ CG2900_ERR("Could not allocate mem for HCI driver");
+ return -ENOMEM;
+ }
+
+ hci_info->hdev->bus = HCI_CG2900;
+ hci_info->hdev->driver_data = hci_info;
+ hci_info->hdev->owner = THIS_MODULE;
+ hci_info->hdev->open = open_from_hci;
+ hci_info->hdev->close = close_from_hci;
+ hci_info->hdev->flush = flush_from_hci;
+ hci_info->hdev->send = send_from_hci;
+ hci_info->hdev->destruct = destruct_from_hci;
+ hci_info->hdev->notify = notify_from_hci;
+ hci_info->hdev->ioctl = ioctl_from_hci;
+
+ err = hci_register_dev(hci_info->hdev);
+ if (err) {
+ CG2900_ERR("Can not register HCI device (%d)", err);
+ hci_free_dev(hci_info->hdev);
+ }
+
+ SET_ENABLE_STATE(ENABLE_IDLE);
+ SET_RESET_STATE(RESET_IDLE);
+
+ return err;
+}
+
+/**
+ * hci_init() - Initialize module.
+ *
+ * Allocate and initialize private data. Register to BlueZ.
+ *
+ * Returns:
+ * 0 if there is no error.
+ * -ENOMEM if allocation fails.
+ * Error codes from register_to_bluez.
+ */
+static int __init hci_init(void)
+{
+ int err;
+ CG2900_INFO("hci_init");
+
+ /* Initialize private data. */
+ hci_info = kzalloc(sizeof(*hci_info), GFP_KERNEL);
+ if (!hci_info) {
+ CG2900_ERR("Could not alloc hci_info struct.");
+ return -ENOMEM;
+ }
+
+ /* Init and register hdev */
+ err = register_to_bluez();
+ if (err) {
+ CG2900_ERR("HCI Device registration error (%d)", err);
+ kfree(hci_info);
+ hci_info = NULL;
+ return err;
+ }
+
+ return 0;
+}
+
+/**
+ * hci_exit() - Remove module.
+ *
+ * Remove HCI device from CG2900 driver.
+ */
+static void __exit hci_exit(void)
+{
+ int err = 0;
+
+ CG2900_INFO("hci_exit");
+
+ if (!hci_info)
+ return;
+
+ if (!hci_info->hdev)
+ goto finished;
+
+ err = hci_unregister_dev(hci_info->hdev);
+ if (err)
+ CG2900_ERR("Can not unregister HCI device (%d)", err);
+ hci_free_dev(hci_info->hdev);
+
+finished:
+ kfree(hci_info);
+ hci_info = NULL;
+}
+
+module_init(hci_init);
+module_exit(hci_exit);
+
+MODULE_AUTHOR("Par-Gunnar Hjalmdahl ST-Ericsson");
+MODULE_AUTHOR("Henrik Possung ST-Ericsson");
+MODULE_AUTHOR("Josef Kindberg ST-Ericsson");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Linux Bluetooth HCI H:4 Driver for ST-Ericsson
controller");
--
1.6.3.3
--
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