diff --git a/include/linux/hayesesp.h b/include/linux/hayesesp.h
new file mode 100644
index 0000000..b436be7
--- /dev/null
+++ b/include/linux/hayesesp.h
@@ -0,0 +1,124 @@
+#ifndef HAYESESP_H
+#define HAYESESP_H
+
+struct hayes_esp_config {
+	short flow_on;
+	short flow_off;
+	short rx_trigger;
+	short tx_trigger;
+	short pio_threshold;
+	unsigned char rx_timeout;
+	char dma_channel;
+};
+
+#ifdef __KERNEL__
+
+#define ESP_DMA_CHANNEL   0
+#define ESP_RX_TRIGGER    768
+#define ESP_TX_TRIGGER    768
+#define ESP_FLOW_OFF      1016
+#define ESP_FLOW_ON       944
+#define ESP_RX_TMOUT      128
+#define ESP_PIO_THRESHOLD 32
+
+#define ESP_IN_MAJOR	57	/* major dev # for dial in */
+#define ESP_OUT_MAJOR	58	/* major dev # for dial out */
+#define ESPC_SCALE 	3
+#define UART_ESI_BASE	0x00
+#define UART_ESI_SID	0x01
+#define UART_ESI_RX	0x02
+#define UART_ESI_TX	0x02
+#define UART_ESI_CMD1	0x04
+#define UART_ESI_CMD2	0x05
+#define UART_ESI_STAT1	0x04
+#define UART_ESI_STAT2	0x05
+#define UART_ESI_RWS	0x07
+
+#define UART_IER_DMA_TMOUT	0x80
+#define UART_IER_DMA_TC		0x08
+
+#define ESI_SET_IRQ		0x04
+#define ESI_SET_DMA_TMOUT	0x05
+#define ESI_SET_SRV_MASK	0x06
+#define ESI_SET_ERR_MASK	0x07
+#define ESI_SET_FLOW_CNTL	0x08
+#define ESI_SET_FLOW_CHARS	0x09
+#define ESI_SET_FLOW_LVL	0x0a
+#define ESI_SET_TRIGGER		0x0b
+#define ESI_SET_RX_TIMEOUT	0x0c
+#define ESI_SET_FLOW_TMOUT	0x0d
+#define ESI_WRITE_UART		0x0e
+#define ESI_READ_UART		0x0f
+#define ESI_SET_MODE		0x10
+#define ESI_GET_ERR_STAT	0x12
+#define ESI_GET_UART_STAT	0x13
+#define ESI_GET_RX_AVAIL	0x14
+#define ESI_GET_TX_AVAIL	0x15
+#define ESI_START_DMA_RX	0x16
+#define ESI_START_DMA_TX	0x17
+#define ESI_ISSUE_BREAK		0x1a
+#define ESI_FLUSH_RX		0x1b
+#define ESI_FLUSH_TX		0x1c
+#define ESI_SET_BAUD		0x1d
+#define ESI_SET_ENH_IRQ		0x1f
+#define ESI_SET_REINTR		0x20
+#define ESI_SET_PRESCALAR	0x23
+#define ESI_NO_COMMAND		0xff
+
+#define ESP_STAT_RX_TIMEOUT	0x01
+#define ESP_STAT_DMA_RX		0x02
+#define ESP_STAT_DMA_TX		0x04
+#define ESP_STAT_NEVER_DMA      0x08
+#define ESP_STAT_USE_PIO        0x10
+
+#define ESP_EVENT_WRITE_WAKEUP	0
+#define ESP_MAGIC		0x53ee
+#define ESP_XMIT_SIZE		4096
+
+struct esp_struct {
+	int			magic;
+	spinlock_t		lock;
+	int			port;
+	int			irq;
+	int			flags; 		/* defined in tty.h */
+	struct tty_struct 	*tty;
+	int			read_status_mask;
+	int			ignore_status_mask;
+	int			timeout;
+	int			stat_flags;
+	int			custom_divisor;
+	int			close_delay;
+	unsigned short		closing_wait;
+	unsigned short		closing_wait2;
+	int			IER; 	/* Interrupt Enable Register */
+	int			MCR; 	/* Modem control register */
+	unsigned long		event;
+	unsigned long		last_active;
+	int			line;
+	int			count;	    /* # of fd on device */
+	int			blocked_open; /* # of blocked opens */
+	unsigned char 		*xmit_buf;
+	int			xmit_head;
+	int			xmit_tail;
+	int			xmit_cnt;
+	struct work_struct	tqueue;
+	struct work_struct	tqueue_hangup;
+	wait_queue_head_t	open_wait;
+	wait_queue_head_t	close_wait;
+	wait_queue_head_t	delta_msr_wait;
+	wait_queue_head_t	break_wait;
+	struct async_icount	icount;	/* kernel counters for the 4 input interrupts */
+	struct hayes_esp_config config; /* port configuration */
+	struct esp_struct	*next_port; /* For the linked list */
+};
+
+struct esp_pio_buffer {
+	unsigned char data[1024];
+	struct esp_pio_buffer *next;
+};
+
+#endif /* __KERNEL__ */
+
+
+#endif /* ESP_H */
+