Support for asynchronous SPI messages and callbacks

[lincan.git] / lincan / include / main.h

diff --git a/lincan/include/main.h b/lincan/include/main.h
index 23accfb31ac56882fccd9f2eeaa6c83af06a14a1..2c146ff1f6bcebfdc915eacddd1a6c9ddcbb84cd 100644 (file)
--- a/lincan/include/main.h
+++ b/lincan/include/main.h
@@ -32,6 +32,8 @@
 /* Publication of enhanced or derived LinCAN files is required although.  */
 /**************************************************************************/
 
+// #define CAN_DEBUG
+
 #include "./can.h"
 #include "./constants.h"
 #include "./can_sysdep.h"
@@ -197,6 +199,7 @@ struct canchip_t {
        int  (*spi_acquire_bus)(struct candevice_t *candev, short channel, int block);
        void (*spi_release_bus)(struct candevice_t *candev, short channel);
        int  (*spi_transfer)(struct candevice_t *candev, void *tx, void *rx, uint16_t len);
+       int  (*spi_async_transfer)(struct candevice_t *candev, void (*callback)(void *data, uint8_t count), void *data, uint8_t count, uint8_t fasthandler);
        short spi_channel;
 
 
@@ -338,14 +341,15 @@ struct hwspecops_t {
        int (*program_irq)(struct candevice_t *candev);
        void (*write_register)(unsigned data, can_ioptr_t address);
        unsigned (*read_register)(can_ioptr_t address);
-       int (*spi_acquire_bus)(struct candevice_t *candev, short channel, int block);
-       void (*spi_release_bus)(struct candevice_t *candev, short channel);
-       int (*spi_transfer)(struct candevice_t *candev, void *tx, void *rx, uint16_t len);
 
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,10))
        void (*release_device)(struct kref *refcount);
 #endif
        
+       int (*spi_acquire_bus)(struct candevice_t *candev, short channel, int block);
+       void (*spi_release_bus)(struct candevice_t *candev, short channel);
+       int (*spi_transfer)(struct candevice_t *candev, void *tx, void *rx, uint16_t len);
+       int (*spi_async_transfer)(struct candevice_t *candev, void (*callback)(void *data, uint8_t count), void *data, uint8_t count, uint8_t fasthandler);
 };
 
 /**
@@ -486,6 +490,28 @@ extern inline unsigned canobj_read_reg(const struct canchip_t *chip, const struc
 #define CONFIG_OC_LINCAN_DYNAMICIO
 #endif
 
+#define SPI_MESSAGE_LENGTH (32)
+
+/**
+ * struct can_spi_async_t - SPI asynchronous communication supplemental data
+ * @chip: pointer to the chip structure
+ * @opcode: Operation code to be identified by spi_async callback function
+ * @tx_buf: a read-only copy of the transfer buffer
+ * @rx_buf: a read-only copy of the transfer buffer
+ * @len: length of the transmitted buffer
+ * @obj: lincan message for data transmission
+ */
+struct can_spi_async_t{
+       struct canchip_t *chip;
+       uint8_t opcode;
+       uint8_t tx_buf[SPI_MESSAGE_LENGTH];
+       uint8_t rx_buf[SPI_MESSAGE_LENGTH];
+       size_t len;
+       struct msgobj_t *obj;
+       canmsg_tstamp_t timestamp;
+};
+
+
 /* Inline function to write to the hardware registers. The argument reg_offs is
  * relative to the memory map of the chip and not the absolute memory reg_offs.
  */
@@ -508,6 +534,11 @@ extern inline int can_spi_transfer(struct canchip_t *chip, void *tx, void *rx, u
        return chip->spi_transfer(chip->hostdevice, tx, rx, len);
 }
 
+extern inline int can_spi_async_transfer(struct canchip_t *chip, void (*callback)(void *data, uint8_t count), struct can_spi_async_t *data, uint8_t count, uint8_t fasthandler)
+{
+       return chip->spi_async_transfer(chip->hostdevice, callback, data, count, fasthandler);
+}
+
 extern inline int can_spi_acquire_bus(struct canchip_t *chip, int block)
 {
        return chip->spi_acquire_bus(chip->hostdevice, chip->spi_channel, block);
@@ -519,7 +550,6 @@ extern inline void can_spi_release_bus(struct canchip_t *chip)
 }
 
 
-
 extern inline void canobj_write_reg(const struct canchip_t *chip, const struct msgobj_t *obj,
                                unsigned char data, unsigned reg_offs)
 {