diff options
Diffstat (limited to 'drivers/staging/cg2900/bluetooth/btcg2900.c')
| -rw-r--r-- | drivers/staging/cg2900/bluetooth/btcg2900.c | 1195 |
1 files changed, 1195 insertions, 0 deletions
diff --git a/drivers/staging/cg2900/bluetooth/btcg2900.c b/drivers/staging/cg2900/bluetooth/btcg2900.c new file mode 100644 index 00000000000..cebd5872222 --- /dev/null +++ b/drivers/staging/cg2900/bluetooth/btcg2900.c @@ -0,0 +1,1195 @@ +/* + * Bluetooth driver for ST-Ericsson CG2900 connectivity controller. + * + * Copyright (C) ST-Ericsson SA 2010 + * + * Authors: + * Par-Gunnar Hjalmdahl (par-gunnar.p.hjalmdahl@stericsson.com) + * Henrik Possung (henrik.possung@stericsson.com) + * Josef Kindberg (josef.kindberg@stericsson.com) + * Dariusz Szymszak (dariusz.xd.szymczak@stericsson.com) + * Kjell Andersson (kjell.k.andersson@stericsson.com) + * + * License terms: GNU General Public License (GPL), version 2 + */ + +#include <asm/byteorder.h> +#include <linux/jiffies.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/platform_device.h> +#include <linux/skbuff.h> +#include <linux/time.h> +#include <linux/timer.h> +#include <linux/types.h> +#include <linux/wait.h> +#include <linux/workqueue.h> +#include <linux/mfd/core.h> +#include <net/bluetooth/bluetooth.h> +#include <net/bluetooth/hci.h> +#include <net/bluetooth/hci_core.h> + +#include "cg2900.h" + +#define BT_HEADER_LENGTH 0x03 + +#define NAME "BTCG2900 " + +/* Wait for 5 seconds for a response to our requests */ +#define RESP_TIMEOUT 5000 + +/* 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 +}; + +/* Defines which state the driver has when BT is active */ +#define BTCG2900_ACTIVE_STATE ENABLE_BT_ENABLED + +/** + * struct btcg2900_info - Specifies HCI driver private data. + * + * This type specifies CG2900 HCI driver private data. + * + * @list: list_head struct. + * @parent: Parent to this BT device. All BT channels will have + * common parent. + * @cmd: Device structure for BT command channel. + * @evt: Device structure for BT event channel. + * @acl: Device structure for BT ACL channel. + * @pdev: Device structure for platform device. + * @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 btcg2900_info { + struct list_head list; + struct device *parent; + struct device *cmd; + struct device *evt; + struct device *acl; + struct hci_dev *hdev; + enum reset_state reset_state; + enum enable_state enable_state; +}; + +/** + * struct enable_info - Specifies data for sending enable commands. + * + * @enable: True if command should enable the functionality. + * @name: Name of the command, only informative. + * @get_cmd: Function for retrieving command. + * @success: State to set upon success. + * @awaiting_cc: State to set while waiting for response. + * @failed: State to set upon failure. + */ +struct enable_info { + bool enable; + char *name; + struct sk_buff* (*get_cmd)(struct btcg2900_info *info, bool enable); + enum enable_state success; + enum enable_state awaiting_cc; + enum enable_state failed; +}; + +/** + * struct dev_info - Specifies private data used when receiving callbacks from CG2900 driver. + * + * @hci_data_type: Type of data according to BlueZ. + */ +struct dev_info { + u8 hci_data_type; +}; + +/* Defines for vs_bt_enable_cmd */ +#define BT_VS_BT_ENABLE 0xFF10 +#define VS_BT_DISABLE 0x00 +#define VS_BT_ENABLE 0x01 + +/** + * struct vs_bt_enable_cmd - Specifies HCI VS Bluetooth_Enable command. + * + * @op_code: HCI command op code. + * @len: Parameter length of command. + * @enable: 0 for disable BT, 1 for enable BT. + */ +struct vs_bt_enable_cmd { + __le16 op_code; + u8 len; + u8 enable; +} __packed; + +/* + * hci_wait_queue - Main Wait Queue in HCI driver. + */ +static DECLARE_WAIT_QUEUE_HEAD(hci_wait_queue); + +/* + * btcg2900_devices - List of active CG2900 BT devices. + */ +static LIST_HEAD(btcg2900_devices); + +/* Internal function declarations */ +static int register_bluetooth(struct btcg2900_info *info); + +/* Internal functions */ + +/** + * get_bt_enable_cmd() - Get HCI BT enable command. + * @info: Device info structure. + * @bt_enable: true if Bluetooth IP shall be enabled, false otherwise. + * + * Returns: + * NULL if no command shall be sent, + * sk_buffer with command otherwise. + */ +static struct sk_buff *get_bt_enable_cmd(struct btcg2900_info *info, + bool bt_enable) +{ + struct sk_buff *skb; + struct vs_bt_enable_cmd *cmd; + struct cg2900_rev_data rev_data; + struct cg2900_user_data *pf_data; + + pf_data = dev_get_platdata(info->cmd); + + if (!pf_data->get_local_revision(pf_data, &rev_data)) { + BT_ERR(NAME "Couldn't get revision"); + return NULL; + } + + /* If connected chip does not support the command return NULL */ + if (!check_chip_revision_support(rev_data.revision)) { + BT_ERR(NAME "Unsupported Chip revision:0x%x\n", + rev_data.revision); + return NULL; + } + + /* CG2900 used */ + skb = pf_data->alloc_skb(sizeof(*cmd), GFP_KERNEL); + if (!skb) { + BT_ERR(NAME "Could not allocate skb"); + return NULL; + } + + cmd = (struct vs_bt_enable_cmd *)skb_put(skb, sizeof(*cmd)); + cmd->op_code = cpu_to_le16(BT_VS_BT_ENABLE); + cmd->len = sizeof(*cmd) - BT_HEADER_LENGTH; + if (bt_enable) + cmd->enable = VS_BT_ENABLE; + else + cmd->enable = VS_BT_DISABLE; + + return skb; +} + +/** + * close_bt_users() - Close all BT channels. + * @info: HCI driver info structure. + */ +static void close_bt_users(struct btcg2900_info *info) +{ + struct cg2900_user_data *pf_data; + + pf_data = dev_get_platdata(info->cmd); + if (pf_data->opened) + pf_data->close(pf_data); + + pf_data = dev_get_platdata(info->acl); + if (pf_data->opened) + pf_data->close(pf_data); + + pf_data = dev_get_platdata(info->evt); + if (pf_data->opened) + pf_data->close(pf_data); +} + +/** + * handle_bt_enable_comp() - Handle received BtEnable Complete event. + * @info: Info structure. + * @skb: Buffer with data coming from device. + * + * Returns: + * true if data has been handled internally, + * false otherwise. + */ +static bool handle_bt_enable_comp(struct btcg2900_info *info, u8 status) +{ + if (info->enable_state != ENABLE_WAITING_BT_ENABLED_CC && + info->enable_state != ENABLE_WAITING_BT_DISABLED_CC) + return false; + /* + * 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). + */ + if (status != HCI_ERR_NO_ERROR && status != HCI_ERR_CMD_DISALLOWED) { + BT_ERR(NAME "Could not enable/disable BT core (0x%X)", + status); + BT_DBG("New enable_state: ENABLE_BT_ERROR"); + info->enable_state = ENABLE_BT_ERROR; + goto finished; + } + + if (info->enable_state == ENABLE_WAITING_BT_ENABLED_CC) { + BT_DBG("New enable_state: ENABLE_BT_ENABLED"); + info->enable_state = ENABLE_BT_ENABLED; + BT_INFO("CG2900 BT core is enabled"); + } else { + BT_DBG("New enable_state: ENABLE_BT_DISABLED"); + info->enable_state = ENABLE_BT_DISABLED; + BT_INFO("CG2900 BT core is disabled"); + } + +finished: + /* Wake up whoever is waiting for this result. */ + wake_up_all(&hci_wait_queue); + return true; +} + +/** + * handle_bt_enable_stat() - Handle received BtEnable Status event. + * @info: Info structure. + * @skb: Buffer with data coming from device. + * + * Returns: + * true if data has been handled internally, + * false otherwise. + */ +static bool handle_bt_enable_stat(struct btcg2900_info *info, u8 status) +{ + if (info->enable_state != ENABLE_WAITING_BT_DISABLED_CC && + info->enable_state != ENABLE_WAITING_BT_ENABLED_CC) + return false; + + BT_DBG("HCI Driver received Command Status (BT enable): 0x%X", status); + /* + * This is the command status event for the HCI_Cmd_VS_Bluetooth_Enable. + * Just free the packet. + */ + return true; +} + +/** + * handle_rx_evt() - Check if received data is response to internal command. + * @info: Info structure. + * @skb: Buffer with data coming from device. + * + * Returns: + * true if data has been handled internally, + * false otherwise. + */ +static bool handle_rx_evt(struct btcg2900_info *info, struct sk_buff *skb) +{ + struct hci_event_hdr *evt = (struct hci_event_hdr *)skb->data; + struct hci_ev_cmd_complete *cmd_complete; + struct hci_ev_cmd_status *cmd_status; + u16 op_code; + u8 status; + bool pkt_handled = false; + + /* If BT is active no internal packets shall be generated */ + if (info->enable_state == BTCG2900_ACTIVE_STATE) + return false; + + if (evt->evt == HCI_EV_CMD_COMPLETE) { + cmd_complete = (struct hci_ev_cmd_complete *)(evt + 1); + status = *((u8 *)(cmd_complete + 1)); + op_code = le16_to_cpu(cmd_complete->opcode); + + if (op_code == BT_VS_BT_ENABLE) + pkt_handled = handle_bt_enable_comp(info, status); + } else if (evt->evt == HCI_EV_CMD_STATUS) { + cmd_status = (struct hci_ev_cmd_status *)(evt + 1); + op_code = le16_to_cpu(cmd_status->opcode); + status = cmd_status->status; + + if (op_code == BT_VS_BT_ENABLE) + pkt_handled = handle_bt_enable_stat(info, status); + } + + if (pkt_handled) + kfree_skb(skb); + + return pkt_handled; +} + +/** + * 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_user_data *user, struct sk_buff *skb) +{ + int err = 0; + struct dev_info *dev_info; + struct btcg2900_info *info; + + dev_info = cg2900_get_usr(user); + info = dev_get_drvdata(user->dev); + + if (user->dev != info->evt || !handle_rx_evt(info, skb)) { + bt_cb(skb)->pkt_type = dev_info->hci_data_type; + skb->dev = (struct net_device *)info->hdev; + /* Update BlueZ stats */ + info->hdev->stat.byte_rx += skb->len; + if (bt_cb(skb)->pkt_type == HCI_ACLDATA_PKT) + info->hdev->stat.acl_rx++; + else + info->hdev->stat.evt_rx++; + + BT_DBG("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) + BT_ERR(NAME "Failed in supplying packet to Bluetooth" + " stack (%d)", err); + } +} + +/** + * hci_reset_cb() - Callback for handling reset from CG2900 driver. + * @dev: CPD device resetting. + */ +static void hci_reset_cb(struct cg2900_user_data *dev) +{ + int err; + struct btcg2900_info *info; + struct cg2900_user_data *pf_data; + + BT_INFO(NAME "hci_reset_cb"); + + info = dev_get_drvdata(dev->dev); + + BT_DBG("New reset_state: RESET_ACTIVATED"); + info->reset_state = RESET_ACTIVATED; + + /* + * Continue to deregister hdev if all channels has been reset else + * return. + */ + pf_data = dev_get_platdata(info->acl); + if (pf_data->opened) + return; + pf_data = dev_get_platdata(info->cmd); + if (pf_data->opened) + return; + pf_data = dev_get_platdata(info->evt); + if (pf_data->opened) + return; + + /* + * Deregister HCI device. Close and Destruct functions should + * in turn be called by BlueZ. + */ + BT_DBG("Deregister HCI device"); + hci_unregister_dev(info->hdev); + + wait_event_timeout(hci_wait_queue, + (RESET_UNREGISTERED == info->reset_state), + msecs_to_jiffies(RESP_TIMEOUT)); + if (RESET_UNREGISTERED != info->reset_state) + /* + * Now we are in trouble. Try to register a new hdev + * anyway even though this will cost some memory. + */ + BT_ERR(NAME "Timeout expired. Could not deregister HCI device"); + + /* Init and register hdev */ + BT_DBG("Register HCI device"); + err = register_bluetooth(info); + if (err) + BT_ERR(NAME "HCI Device registration error (%d)", err); +} + +/** + * send_enable_cmd() - Send a command with only enable/disable functionality. + * @info: Info structure. + * @en_info: Enable info structure. + * + * Returns: + * 0 if successful, + * -EACCES if correct response to command is not received, + * Error codes from CG2900 write. + */ +static int send_enable_cmd(struct btcg2900_info *info, + struct enable_info *en_info) +{ + struct sk_buff *enable_cmd; + int err; + struct cg2900_user_data *pf_data; + + /* + * Call function that returns the chip dependent enable HCI command. + * If NULL is returned, then no bt_enable command should be sent to the + * chip. + */ + enable_cmd = en_info->get_cmd(info, en_info->enable); + if (!enable_cmd) { + BT_DBG("%s New enable_state: %d", en_info->name, + en_info->success); + info->enable_state = en_info->success; + return 0; + } + + /* Set the HCI state before sending command to chip. */ + BT_DBG("%s New enable_state: %d", en_info->name, en_info->awaiting_cc); + info->enable_state = en_info->awaiting_cc; + + /* Send command to chip */ + pf_data = dev_get_platdata(info->cmd); + err = pf_data->write(pf_data, enable_cmd); + if (err) { + BT_ERR("Couldn't send %s command (%d)", en_info->name, err); + kfree_skb(enable_cmd); + info->enable_state = en_info->failed; + return err; + } + + /* + * Wait for callback to receive command complete and then wake us up + * again. + */ + wait_event_timeout(hci_wait_queue, + info->enable_state == en_info->success, + msecs_to_jiffies(RESP_TIMEOUT)); + /* Check the current state to see if it worked */ + if (info->enable_state != en_info->success) { + BT_ERR("Could not change %s state (%d)", + en_info->name, info->enable_state); + BT_DBG("%s New enable_state: %d", en_info->name, + en_info->failed); + info->enable_state = en_info->failed; + return -EACCES; + } + + return 0; +} + +/** + * btcg2900_open() - 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 btcg2900_open(struct hci_dev *hdev) +{ + struct btcg2900_info *info; + struct cg2900_user_data *pf_data; + int err; + struct enable_info en_info; + + BT_INFO("Open ST-Ericsson CG2900 driver"); + + if (!hdev) { + BT_ERR(NAME "NULL supplied for hdev"); + return -EINVAL; + } + + info = hci_get_drvdata(hdev); + if (!info) { + BT_ERR(NAME "NULL supplied for driver_data"); + return -EINVAL; + } + + if (test_and_set_bit(HCI_RUNNING, &(hdev->flags))) { + BT_ERR(NAME "Device already opened!"); + return -EBUSY; + } + + pf_data = dev_get_platdata(info->acl); + err = pf_data->open(pf_data); + if (err) { + BT_ERR("Couldn't open BT ACL channel (%d)", err); + goto handle_error; + } + + pf_data = dev_get_platdata(info->cmd); + err = pf_data->open(pf_data); + if (err) { + BT_ERR("Couldn't open BT CMD channel (%d)", err); + goto handle_error; + } + + pf_data = dev_get_platdata(info->evt); + err = pf_data->open(pf_data); + if (err) { + BT_ERR("Couldn't open BT EVT channel (%d)", err); + goto handle_error; + } + + if (info->reset_state == RESET_ACTIVATED) { + BT_DBG("New reset_state: RESET_IDLE"); + info->reset_state = RESET_IDLE; + } + + /* First enable the BT core */ + en_info.enable = true; + en_info.get_cmd = get_bt_enable_cmd; + en_info.name = "VS BT Enable (true)"; + en_info.success = ENABLE_BT_ENABLED; + en_info.awaiting_cc = ENABLE_WAITING_BT_ENABLED_CC; + en_info.failed = ENABLE_BT_DISABLED; + + err = send_enable_cmd(info, &en_info); + if (err) { + BT_ERR("Couldn't enable BT core (%d)", err); + goto handle_error; + } + + return 0; + +handle_error: + close_bt_users(info); + clear_bit(HCI_RUNNING, &(hdev->flags)); + return err; + +} + +/** + * btcg2900_close() - 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 btcg2900_close(struct hci_dev *hdev) +{ + struct btcg2900_info *info = NULL; + int err; + struct enable_info en_info; + + BT_DBG("btcg2900_close"); + + if (!hdev) { + BT_ERR(NAME "NULL supplied for hdev"); + return -EINVAL; + } + + info = hci_get_drvdata(hdev); + if (!info) { + BT_ERR(NAME "NULL supplied for driver_data"); + return -EINVAL; + } + + if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags))) { + BT_ERR(NAME "Device already closed!"); + return -EBUSY; + } + + /* Do not do this if there is an reset ongoing */ + if (info->reset_state == RESET_ACTIVATED) + goto remove_users; + + /* Now disable the BT core */ + en_info.enable = false; + en_info.get_cmd = get_bt_enable_cmd; + en_info.name = "VS BT Enable (false)"; + en_info.success = ENABLE_BT_DISABLED; + en_info.awaiting_cc = ENABLE_WAITING_BT_DISABLED_CC; + en_info.failed = ENABLE_BT_ENABLED; + + err = send_enable_cmd(info, &en_info); + if (err) + BT_ERR("Couldn't disable BT core (%d)", err); + +remove_users: + /* Finally deregister all users and free allocated data */ + close_bt_users(info); + return 0; +} + +/** + * btcg2900_send() - 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 btcg2900_send(struct sk_buff *skb) +{ + struct hci_dev *hdev; + struct btcg2900_info *info; + struct cg2900_user_data *pf_data; + int err = 0; + + if (!skb) { + BT_ERR(NAME "NULL supplied for skb"); + return -EINVAL; + } + + hdev = (struct hci_dev *)(skb->dev); + if (!hdev) { + BT_ERR(NAME "NULL supplied for hdev"); + return -EINVAL; + } + + info = hci_get_drvdata(hdev); + if (!info) { + BT_ERR(NAME "NULL supplied for info"); + return -EINVAL; + } + + /* Update BlueZ stats */ + hdev->stat.byte_tx += skb->len; + + BT_DBG("Data transmit %d bytes", skb->len); + + switch (bt_cb(skb)->pkt_type) { + case HCI_COMMAND_PKT: + BT_DBG("Sending HCI_COMMAND_PKT"); + pf_data = dev_get_platdata(info->cmd); + err = pf_data->write(pf_data, skb); + hdev->stat.cmd_tx++; + break; + case HCI_ACLDATA_PKT: + BT_DBG("Sending HCI_ACLDATA_PKT"); + pf_data = dev_get_platdata(info->acl); + err = pf_data->write(pf_data, skb); + hdev->stat.acl_tx++; + break; + default: + BT_ERR(NAME "Trying to transmit unsupported packet type" + " (0x%.2X)", bt_cb(skb)->pkt_type); + err = -EOPNOTSUPP; + break; + }; + + return err; +} + +/** + * btcg2900_destruct() - Destruct HCI interface. + * @hdev: HCI device being destructed. + */ +static void btcg2900_destruct(struct hci_dev *hdev) +{ + struct btcg2900_info *info; + + BT_DBG("btcg2900_destruct"); + + info = hci_get_drvdata(hdev); + if (!info) { + BT_ERR(NAME "NULL supplied for info"); + return; + } + + /* + * When destruct is called it means that the Bluetooth stack is done + * with the HCI device and we can now free it. + * Normally we do this only when removing the whole module through + * btcg2900_remove(), but when being reset we free the device here and + * we then set the reset state so that the reset handler can allocate a + * new HCI device and then register it to the Bluetooth stack. + */ + if (info->reset_state == RESET_ACTIVATED) { + if (info->hdev) { + hci_free_dev(info->hdev); + info->hdev = NULL; + } + BT_DBG("New reset_state: RESET_UNREGISTERED"); + info->reset_state = RESET_UNREGISTERED; + wake_up_all(&hci_wait_queue); + } +} + +/** + * get_info() - Return info structure for this device. + * @dev: Current device. + * + * Returns: + * Pointer to info struct if there is no error. + * ERR_PTR(-ENOMEM) if allocation fails. + */ +static struct btcg2900_info *get_info(struct device *dev) +{ + struct list_head *cursor; + struct btcg2900_info *tmp; + struct btcg2900_info *info = NULL; + + /* Find the info structure */ + list_for_each(cursor, &btcg2900_devices) { + tmp = list_entry(cursor, struct btcg2900_info, list); + if (tmp->parent == dev->parent) { + info = tmp; + break; + } + } + + if (info) + return info; + + info = kzalloc(sizeof(*info), GFP_KERNEL); + if (!info) { + BT_ERR("Could not allocate info struct"); + return ERR_PTR(-ENOMEM); + } + info->parent = dev->parent; + list_add_tail(&info->list, &btcg2900_devices); + BT_DBG("CG2900 device added"); + return info; +} + +/** + * device_removed() - Remove device from list if there are no channels left. + * @info: BTCG2900 info structure. + */ +static void device_removed(struct btcg2900_info *info) +{ + struct list_head *cursor; + struct btcg2900_info *tmp; + + if (info->acl || info->cmd || info->evt) + /* There are still devices active */ + return; + + /* Find the info structure and delete it */ + list_for_each(cursor, &btcg2900_devices) { + tmp = list_entry(cursor, struct btcg2900_info, list); + if (tmp == info) { + list_del(cursor); + break; + } + } + kfree(info); + BT_DBG("CG2900 device removed"); +} + +/** + * register_bluetooth() - 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_bluetooth(struct btcg2900_info *info) +{ + int err; + struct cg2900_user_data *pf_data; + + /* Check if all channels have been probed */ + if (!info->acl || !info->cmd || !info->evt) + return 0; + + pf_data = dev_get_platdata(info->cmd); + + info->hdev = hci_alloc_dev(); + if (!info->hdev) { + BT_ERR("Could not allocate mem for CG2900 BT driver"); + return -ENOMEM; + } + + SET_HCIDEV_DEV(info->hdev, info->parent); + info->hdev->bus = pf_data->channel_data.bt_bus; + hci_set_drvdata(info->hdev, info); + info->hdev->open = btcg2900_open; + info->hdev->close = btcg2900_close; + info->hdev->send = btcg2900_send; + /* FIXME no more destruct move this management somewhere + * info->hdev->destruct = btcg2900_destruct; + */ + + err = hci_register_dev(info->hdev); + if (err) { + BT_ERR("Can not register BTCG2900 HCI device (%d)", err); + hci_free_dev(info->hdev); + info->hdev = NULL; + } + + BT_INFO("CG2900 registered"); + + BT_DBG("New enable_state: ENABLE_IDLE"); + info->enable_state = ENABLE_IDLE; + BT_DBG("New reset_state: RESET_IDLE"); + info->reset_state = RESET_IDLE; + + return err; +} + +/** + * probe_common() - Initialize channel and register to BT stack. + * @dev: Current device. + * @info: BTCG2900 info structure. + * @hci_data_type: Data type of this channel, e.g. ACL. + * + * Allocate and initialize private data. Register to Bluetooth stack. + * + * Returns: + * 0 if there is no error. + * -ENOMEM if allocation fails. + * Error codes from register_bluetooth. + */ +static int probe_common(struct platform_device *pdev, + struct btcg2900_info *info, + u8 hci_data_type) +{ + int err; + struct cg2900_user_data *pf_data; + struct dev_info *dev_info; + struct device *dev = &pdev->dev; + + dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL); + if (!dev_info) { + BT_ERR("Could not allocate dev_info"); + return -ENOMEM; + } + + dev_set_drvdata(dev, info); + + pf_data = dev_get_platdata(dev); + pf_data->dev = dev; + pf_data->read_cb = hci_read_cb; + pf_data->reset_cb = hci_reset_cb; + + /* Init and register hdev */ + err = register_bluetooth(info); + if (err) { + BT_ERR("HCI Device registration error (%d)", err); + kfree(dev_info); + return err; + } + dev_info->hci_data_type = hci_data_type; + cg2900_set_usr(pf_data, dev_info); + + return 0; +} + +/** + * btcg2900_cmd_probe() - Initialize command channel. + * @pdev: Platform device. + * + * Allocate and initialize private data. + * + * Returns: + * 0 if there is no error. + * Error codes from get_info and probe_common. + */ +static int __devinit btcg2900_cmd_probe(struct platform_device *pdev) +{ + int err; + struct btcg2900_info *info; + + BT_DBG("Starting CG2900 Command channel"); + + info = get_info(&pdev->dev); + if (IS_ERR(info)) + return PTR_ERR(info); + + info->cmd = &pdev->dev; + + err = probe_common(pdev, info, HCI_COMMAND_PKT); + if (err) { + BT_ERR("Failed to initialize channel"); + info->cmd = NULL; + device_removed(info); + return err; + } + + return 0; +} + +/** + * btcg2900_acl_probe() - Initialize command channel. + * @pdev: Platform device. + * + * Allocate and initialize private data. + * + * Returns: + * 0 if there is no error. + * Error codes from get_info and probe_common. + */ +static int __devinit btcg2900_acl_probe(struct platform_device *pdev) +{ + int err; + struct btcg2900_info *info; + + BT_DBG("Starting CG2900 ACL channel"); + + info = get_info(&pdev->dev); + if (IS_ERR(info)) + return PTR_ERR(info); + + info->acl = &pdev->dev; + + err = probe_common(pdev, info, HCI_ACLDATA_PKT); + if (err) { + BT_ERR("Failed to initialize channel"); + info->acl = NULL; + device_removed(info); + return err; + } + + return 0; +} + +/** + * btcg2900_evt_probe() - Initialize event channel. + * @pdev: Platform device. + * + * Allocate and initialize private data. + * + * Returns: + * 0 if there is no error. + * Error codes from get_info and probe_common. + */ +static int __devinit btcg2900_evt_probe(struct platform_device *pdev) +{ + int err; + struct btcg2900_info *info; + + BT_DBG("Starting CG2900 Event channel"); + + info = get_info(&pdev->dev); + if (IS_ERR(info)) + return PTR_ERR(info); + + info->evt = &pdev->dev; + + err = probe_common(pdev, info, HCI_EVENT_PKT); + if (err) { + BT_ERR("Failed to initialize channel"); + info->evt = NULL; + device_removed(info); + return err; + } + + return 0; +} + +/** + * remove_common() - Remove channel. + * @pdev: Platform device. + * + * Returns: + * 0 if there is no error. + * Error codes from hci_unregister_dev. + */ +static int remove_common(struct platform_device *pdev, + struct btcg2900_info *info) +{ + int err = 0; + struct cg2900_user_data *pf_data; + struct dev_info *dev_info; + + pf_data = dev_get_platdata(&pdev->dev); + dev_info = cg2900_get_usr(pf_data); + + kfree(dev_info); + cg2900_set_usr(pf_data, NULL); + + if (!info->hdev) + goto finished; + + BT_INFO("Unregistering CG2900"); + hci_set_drvdata(info->hdev, NULL); + hci_unregister_dev(info->hdev); + hci_free_dev(info->hdev); + info->hdev = NULL; + +finished: + device_removed(info); + return err; +} + +/** + * btcg2900_cmd_remove() - Remove command channel. + * @pdev: Platform device. + * + * Returns: + * 0 if there is no error. + * Error codes from remove_common. + */ +static int __devexit btcg2900_cmd_remove(struct platform_device *pdev) +{ + struct btcg2900_info *info; + + BT_DBG("Removing CG2900 Command channel"); + + info = dev_get_drvdata(&pdev->dev); + info->cmd = NULL; + return remove_common(pdev, info); +} + +/** + * btcg2900_acl_remove() - Remove ACL channel. + * @pdev: Platform device. + * + * Returns: + * 0 if there is no error. + * Error codes from remove_common. + */ +static int __devexit btcg2900_acl_remove(struct platform_device *pdev) +{ + struct btcg2900_info *info; + + BT_DBG("Removing CG2900 ACL channel"); + + info = dev_get_drvdata(&pdev->dev); + info->acl = NULL; + return remove_common(pdev, info); +} + +/** + * btcg2900_evt_remove() - Remove event channel. + * @pdev: Platform device. + * + * Returns: + * 0 if there is no error. + * Error codes from remove_common. + */ +static int __devexit btcg2900_evt_remove(struct platform_device *pdev) +{ + struct btcg2900_info *info; + + BT_DBG("Removing CG2900 Event channel"); + + info = dev_get_drvdata(&pdev->dev); + info->evt = NULL; + return remove_common(pdev, info); +} + +static struct platform_driver btcg2900_cmd_driver = { + .driver = { + .name = "cg2900-btcmd", + .owner = THIS_MODULE, + }, + .probe = btcg2900_cmd_probe, + .remove = __devexit_p(btcg2900_cmd_remove), +}; + +static struct platform_driver btcg2900_acl_driver = { + .driver = { + .name = "cg2900-btacl", + .owner = THIS_MODULE, + }, + .probe = btcg2900_acl_probe, + .remove = __devexit_p(btcg2900_acl_remove), +}; + +static struct platform_driver btcg2900_evt_driver = { + .driver = { + .name = "cg2900-btevt", + .owner = THIS_MODULE, + }, + .probe = btcg2900_evt_probe, + .remove = __devexit_p(btcg2900_evt_remove), +}; + +/** + * btcg2900_init() - Initialize module. + * + * Registers platform driver. + */ +static int __init btcg2900_init(void) +{ + int err; + + BT_DBG("btcg2900_init"); + + err = platform_driver_register(&btcg2900_cmd_driver); + if (err) { + BT_ERR("Failed to register cmd (%d)", err); + return err; + } + err = platform_driver_register(&btcg2900_acl_driver); + if (err) { + BT_ERR("Failed to register acl (%d)", err); + return err; + } + err = platform_driver_register(&btcg2900_evt_driver); + if (err) { + BT_ERR("Failed to register evt (%d)", err); + return err; + } + return err; +} + +/** + * btcg2900_exit() - Remove module. + * + * Unregisters platform driver. + */ +static void __exit btcg2900_exit(void) +{ + BT_DBG("btcg2900_exit"); + platform_driver_unregister(&btcg2900_cmd_driver); + platform_driver_unregister(&btcg2900_acl_driver); + platform_driver_unregister(&btcg2900_evt_driver); +} + +module_init(btcg2900_init); +module_exit(btcg2900_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"); |