/** Write to the data manager file */
__EXPORT ssize_t
dm_write(dm_item_t item, unsigned char index, dm_persitence_t persistence, const void *buf, size_t count)
{
work_q_item_t *work;
/* Make sure data manager has been started and is not shutting down */
if ((g_fd < 0) || g_task_should_exit) {
return -1;
}
/* get a work item and queue up a write request */
if ((work = create_work_item()) == NULL) {
return -1;
}
work->func = dm_write_func;
work->write_params.item = item;
work->write_params.index = index;
work->write_params.persistence = persistence;
work->write_params.buf = buf;
work->write_params.count = count;
/* Enqueue the item on the work queue and wait for the worker thread to complete processing it */
return (ssize_t)enqueue_work_item_and_wait_for_result(work);
}
/**
* uart_tty_wakeup() - Callback function for transmit wake up.
* @tty: Pointer to associated TTY instance data.
*
* The uart_tty_wakeup() callback function is called when low level
* device driver can accept more send data.
*/
static void uart_tty_wakeup(struct tty_struct *tty)
{
int err;
CG2900_INFO("uart_tty_wakeup");
/*
* Clear the TTY_DO_WRITE_WAKEUP bit that is set in
* work_do_transmit().
*/
clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
if (tty != uart_info->tty)
return;
#ifdef BAUD_RATE_FIX
/* Delete sleep timer. */
(void)del_timer(&uart_info->timer);
#endif /* BAUD_RATE_FIX */
/* Start TX operation */
err = create_work_item(uart_info->wq, work_do_transmit, NULL);
if (err)
CG2900_ERR("Failed to create work item (%d) uart_tty_wakeup",
err);
}
/**
* uart_tty_close() - Close UART tty.
* @tty: Pointer to associated TTY instance data.
*
* The uart_tty_close() function is called when the line discipline is changed
* to something else, the TTY is closed, or the TTY detects a hangup.
*/
static void uart_tty_close(struct tty_struct *tty)
{
int err;
CG2900_INFO("uart_tty_close");
BUG_ON(!uart_info);
BUG_ON(!uart_info->wq);
err = create_work_item(uart_info->wq, work_hw_deregistered, NULL);
if (err)
CG2900_ERR("Failed to create work item (%d) "
"work_hw_deregistered", err);
}
/* Tell the data manager about the type of the last reset */
__EXPORT int
dm_restart(dm_reset_reason reason)
{
work_q_item_t *work;
/* Make sure data manager has been started and is not shutting down */
if ((g_fd < 0) || g_task_should_exit)
return -1;
/* get a work item and queue up a restart request */
if ((work = create_work_item()) == NULL)
return -1;
work->func = dm_restart_func;
work->restart_params.reason = reason;
/* Enqueue the item on the work queue and wait for the worker thread to complete processing it */
return enqueue_work_item_and_wait_for_result(work);
}
__EXPORT int
dm_clear(dm_item_t item)
{
work_q_item_t *work;
/* Make sure data manager has been started and is not shutting down */
if ((g_fd < 0) || g_task_should_exit) {
return -1;
}
/* get a work item and queue up a clear request */
if ((work = create_work_item()) == NULL) {
return -1;
}
work->func = dm_clear_func;
work->clear_params.item = item;
/* Enqueue the item on the work queue and wait for the worker thread to complete processing it */
return enqueue_work_item_and_wait_for_result(work);
}
/**
* uart_write() - Transmit data to CG2900 over UART.
* @dev: Transport device information.
* @skb: SK buffer to transmit.
*
* Returns:
* 0 if there is no error.
* Errors from create_work_item.
*/
static int uart_write(struct cg2900_trans_dev *dev, struct sk_buff *skb)
{
int err;
#ifdef BAUD_RATE_FIX
/* Delete sleep timer. */
(void)del_timer(&uart_info->timer);
#else /* BAUD_RATE_FIX */
update_timer();
#endif /* BAUD_RATE_FIX */
/* Queue the sk_buffer... */
skb_queue_tail(&uart_info->tx_queue, skb);
CG2900_DBG_DATA_CONTENT("uart_write", skb->data, skb->len);
/* ...and start TX operation */
err = create_work_item(uart_info->wq, work_do_transmit, NULL);
if (err)
CG2900_ERR("Failed to create work item (%d) uart_tty_wakeup",
err);
return err;
}
/**
* set_baud_rate() - Sets new baud rate for the UART.
* @baud: New baud rate.
*
* This function first sends the HCI command
* Hci_Cmd_ST_Set_Uart_Baud_Rate. It then changes the baud rate in HW, and
* finally it waits for the Command Complete event for the
* Hci_Cmd_ST_Set_Uart_Baud_Rate command.
*
* Returns:
* 0 if there is no error.
* -EALREADY if baud rate change is already in progress.
* -EFAULT if one or more of the UART related structs is not allocated.
* -ENOMEM if skb allocation has failed.
* -EPERM if setting the new baud rate has failed.
* Error codes generated by create_work_item.
*/
static int set_baud_rate(int baud)
{
struct tty_struct *tty = NULL;
int err = 0;
struct sk_buff *skb;
int old_baud_rate;
CG2900_INFO("set_baud_rate (%d baud)", baud);
if (uart_info->baud_rate_state != BAUD_IDLE) {
CG2900_ERR("Trying to set new baud rate before old setting "
"is finished");
return -EALREADY;
}
if (uart_info->tty)
tty = uart_info->tty;
else {
CG2900_ERR("Important structs not allocated!");
return -EFAULT;
}
#ifdef BAUD_RATE_FIX
/* Disable the RTS Flow */
//tty_throttle(tty); // Not supported by Host
//cg29xx_rts_gpio_control(0);
/* ++Hemant: Baudrate Workaround */
cg29xx_rts_gpio_control(0);
/* --Hemant: Baudrate Workaround */
#endif /* BAUD_RATE_FIX */
/*
* Store old baud rate so that we can restore it if something goes
* wrong.
*/
old_baud_rate = uart_info->baud_rate;
skb = alloc_set_baud_rate_cmd(&baud);
if (!skb) {
CG2900_ERR("alloc_set_baud_rate_cmd failed");
return -ENOMEM;
}
SET_BAUD_STATE(BAUD_START);
uart_info->baud_rate = baud;
/* Queue the sk_buffer... */
skb_queue_tail(&uart_info->tx_queue, skb);
/* ... and call the common UART TX function */
CG2900_DBG_DATA_CONTENT("set_baud_rate", skb->data, skb->len);
err = create_work_item(uart_info->wq, work_do_transmit, NULL);
if (err) {
CG2900_ERR("Failed to send change baud rate cmd, freeing "
"skb.");
skb = skb_dequeue_tail(&uart_info->tx_queue);
SET_BAUD_STATE(BAUD_IDLE);
uart_info->baud_rate = old_baud_rate;
kfree_skb(skb);
return err;
}
CG2900_DBG("Set baud rate cmd scheduled for sending.");
printk(KERN_ERR "Set baud rate cmd scheduled for sending.");
/*
* Now wait for the command complete.
* It will come at the new baudrate.
*/
wait_event_interruptible_timeout(uart_wait_queue,
((BAUD_SUCCESS == uart_info->baud_rate_state) ||
(BAUD_FAIL == uart_info->baud_rate_state)),
msecs_to_jiffies(UART_RESP_TIMEOUT/50));/* ++ daniel - port fail recovery */
if (BAUD_SUCCESS == uart_info->baud_rate_state)
//CG2900_DBG("Baudrate changed to %d baud", baud);
printk(KERN_ERR "Baudrate changed to %d baud", baud);
else {
//CG2900_ERR("Failed to set new baudrate (%d)",
// uart_info->baud_rate_state);
printk(KERN_ERR "Failed to set new baudrate (%d)",
uart_info->baud_rate_state);
err = -EPERM;
}
/* Finally flush the TTY so we are sure that is no bad data there */
if (tty->ops->flush_buffer) {
CG2900_DBG("Flushing TTY after baud rate change");
tty->ops->flush_buffer(tty);
}
/* Finished. Set state to IDLE */
SET_BAUD_STATE(BAUD_IDLE);
return err;
}
