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HID: intel-ish-hid: ishtp: add helper functions for client buffer operation

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Add helper ishtp_cl_tx_empty() and ishtp_cl_rx_get_rb() to hide internal
details from callers, who needs this functionality.

Signed-off-by: Even Xu <even.xu@intel.com>
Reviewed-by: Andriy Shevchenko <andriy.shevchenko@intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Even Xu 2018-09-11 16:44:15 -07:00 committed by Jiri Kosina
parent d174c6664f
commit a1c40ce62f
2 changed files with 47 additions and 0 deletions
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45
drivers/hid/intel-ish-hid/ishtp/client-buffers.c
View File

@ -255,3 +255,48 @@ int ishtp_cl_io_rb_recycle(struct ishtp_cl_rb *rb)
return rets;
}
EXPORT_SYMBOL(ishtp_cl_io_rb_recycle);
/**
* ishtp_cl_tx_empty() -test whether client device tx buffer is empty
* @cl: Pointer to client device instance
*
* Look client device tx buffer list, and check whether this list is empty
*
* Return: true if client tx buffer list is empty else false
*/
bool ishtp_cl_tx_empty(struct ishtp_cl *cl)
{
int tx_list_empty;
unsigned long tx_flags;
spin_lock_irqsave(&cl->tx_list_spinlock, tx_flags);
tx_list_empty = list_empty(&cl->tx_list.list);
spin_unlock_irqrestore(&cl->tx_list_spinlock, tx_flags);
return !!tx_list_empty;
}
EXPORT_SYMBOL(ishtp_cl_tx_empty);
/**
* ishtp_cl_rx_get_rb() -Get a rb from client device rx buffer list
* @cl: Pointer to client device instance
*
* Check client device in-processing buffer list and get a rb from it.
*
* Return: rb pointer if buffer list isn't empty else NULL
*/
struct ishtp_cl_rb *ishtp_cl_rx_get_rb(struct ishtp_cl *cl)
{
unsigned long rx_flags;
struct ishtp_cl_rb *rb;
spin_lock_irqsave(&cl->in_process_spinlock, rx_flags);
rb = list_first_entry_or_null(&cl->in_process_list.list,
struct ishtp_cl_rb, list);
if (rb)
list_del_init(&rb->list);
spin_unlock_irqrestore(&cl->in_process_spinlock, rx_flags);
return rb;
}
EXPORT_SYMBOL(ishtp_cl_rx_get_rb);

2
drivers/hid/intel-ish-hid/ishtp/client.h
View File

@ -178,5 +178,7 @@ int ishtp_cl_flush_queues(struct ishtp_cl *cl);
/* exported functions from ISHTP client buffer management scope */
int ishtp_cl_io_rb_recycle(struct ishtp_cl_rb *rb);
bool ishtp_cl_tx_empty(struct ishtp_cl *cl);
struct ishtp_cl_rb *ishtp_cl_rx_get_rb(struct ishtp_cl *cl);
#endif /* _ISHTP_CLIENT_H_ */