From 6b729861831177b270a2932a13e79cb41d673146 Mon Sep 17 00:00:00 2001 From: Evgeniy Polyakov Date: Sat, 4 Jun 2005 01:30:43 +0400 Subject: [PATCH] w1: Added the triplet w1 master method and changes w1_search() to use it. Adds the triplet w1 master method and changes w1_search() to use it. Signed-off-by: Ben Gardner Signed-off-by: Evgeniy Polyakov Signed-off-by: Greg Kroah-Hartman --- drivers/w1/w1.h | 87 ++++++++++++++++++++++++++++++++++++++++++++------------- 1 file changed, 67 insertions(+), 20 deletions(-) (limited to 'drivers/w1/w1.h') diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h index 44dfb92e55cd..3cfdd08d32fc 100644 --- a/drivers/w1/w1.h +++ b/drivers/w1/w1.h @@ -25,9 +25,9 @@ struct w1_reg_num { #if defined(__LITTLE_ENDIAN_BITFIELD) - __u64 family:8, - id:48, - crc:8; + __u64 family:8, + id:48, + crc:8; #elif defined(__BIG_ENDIAN_BITFIELD) __u64 crc:8, id:48, @@ -84,24 +84,71 @@ struct w1_slave typedef void (* w1_slave_found_callback)(unsigned long, u64); + +/** + * Note: read_bit and write_bit are very low level functions and should only + * be used with hardware that doesn't really support 1-wire operations, + * like a parallel/serial port. + * Either define read_bit and write_bit OR define, at minimum, touch_bit and + * reset_bus. + */ struct w1_bus_master { - unsigned long data; - - u8 (*read_bit)(unsigned long); - void (*write_bit)(unsigned long, u8); - - u8 (*read_byte)(unsigned long); - void (*write_byte)(unsigned long, u8); - - u8 (*read_block)(unsigned long, u8 *, int); - void (*write_block)(unsigned long, u8 *, int); - - u8 (*touch_bit)(unsigned long, u8); - - u8 (*reset_bus)(unsigned long); - - void (*search)(unsigned long, w1_slave_found_callback); + /** the first parameter in all the functions below */ + unsigned long data; + + /** + * Sample the line level + * @return the level read (0 or 1) + */ + u8 (*read_bit)(unsigned long); + + /** Sets the line level */ + void (*write_bit)(unsigned long, u8); + + /** + * touch_bit is the lowest-level function for devices that really + * support the 1-wire protocol. + * touch_bit(0) = write-0 cycle + * touch_bit(1) = write-1 / read cycle + * @return the bit read (0 or 1) + */ + u8 (*touch_bit)(unsigned long, u8); + + /** + * Reads a bytes. Same as 8 touch_bit(1) calls. + * @return the byte read + */ + u8 (*read_byte)(unsigned long); + + /** + * Writes a byte. Same as 8 touch_bit(x) calls. + */ + void (*write_byte)(unsigned long, u8); + + /** + * Same as a series of read_byte() calls + * @return the number of bytes read + */ + u8 (*read_block)(unsigned long, u8 *, int); + + /** Same as a series of write_byte() calls */ + void (*write_block)(unsigned long, const u8 *, int); + + /** + * Combines two reads and a smart write for ROM searches + * @return bit0=Id bit1=comp_id bit2=dir_taken + */ + u8 (*triplet)(unsigned long, u8); + + /** + * long write-0 with a read for the presence pulse detection + * @return -1=Error, 0=Device present, 1=No device present + */ + u8 (*reset_bus)(unsigned long); + + /** Really nice hardware can handles the ROM searches */ + void (*search)(unsigned long, w1_slave_found_callback); }; struct w1_master @@ -137,7 +184,7 @@ struct w1_master }; int w1_create_master_attributes(struct w1_master *); -void w1_search(struct w1_master *dev); +void w1_search(struct w1_master *dev, w1_slave_found_callback cb); #endif /* __KERNEL__ */ -- cgit v1.2.2