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Add poll method to serial drivers

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1268 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2008-11-17 23:22:27 +00:00
parent 2ed32601fa
commit c14ec89a4f
8 changed files with 406 additions and 113 deletions
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include/nuttx/serial.h
+47 -1
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@@ -49,6 +49,14 @@
* Definitions
************************************************************************************/
/* Maximum number of threads than can be waiting for POLL events */
#ifndef CONFIG_DEV_CONSOLE_NPOLLWAITERS
# define CONFIG_DEV_CONSOLE_NPOLLWAITERS 2
#endif
/* vtable access helpers */
#define uart_setup(dev) dev->ops->setup(dev)
#define uart_shutdown(dev) dev->ops->shutdown(dev)
#define uart_attach(dev) dev->ops->attach(dev)
@@ -186,10 +194,23 @@ struct uart_dev_s
sem_t closesem; /* Locks out new open while close is in progress */
sem_t xmitsem; /* Wakeup user waiting for space in xmit.buffer */
sem_t recvsem; /* Wakeup user waiting for data in recv.buffer */
#ifndef CONFIG_DISABLE_POLL
sem_t pollsem; /* Manages exclusive access to fds[] */
#endif
struct uart_buffer_s xmit; /* Describes transmit buffer */
struct uart_buffer_s recv; /* Describes receive buffer */
FAR const struct uart_ops_s *ops; /* Arch-specific operations */
FAR void *priv; /* Used by the arch-specific logic */
FAR void *priv; /* Used by the arch-specific logic */
/* The following is a list if poll structures of threads waiting for
* driver events. The 'struct pollfd' reference for each open is also
* retained in the f_priv field of the 'struct file'.
*/
#ifndef CONFIG_DISABLE_POLL
struct pollfd *fds[CONFIG_DEV_CONSOLE_NPOLLWAITERS];
#endif
};
typedef struct uart_dev_s uart_dev_t;
@@ -245,6 +266,31 @@ EXTERN void uart_xmitchars(FAR uart_dev_t *dev);
EXTERN void uart_recvchars(FAR uart_dev_t *dev);
/************************************************************************************
* Name: uart_datareceived
*
* Description:
* This function is called from uart_recvchars when new serial data is place in
* the driver's circular buffer. This function will wake-up any stalled read()
* operations that are waiting for incoming data.
*
************************************************************************************/
EXTERN void uart_datareceived(FAR uart_dev_t *dev);
/************************************************************************************
* Name: uart_datasent
*
* Description:
* This function is called from uart_xmitchars after serial data has been sent,
* freeing up some space in the driver's circular buffer. This function will
* wake-up any stalled write() operations that was waiting for space to buffer
* outgoing data.
*
************************************************************************************/
EXTERN void uart_datasent(FAR uart_dev_t *dev);
#undef EXTERN
#if defined(__cplusplus)
}