diff options
Diffstat (limited to 'drivers/w1/w1.h')
| -rw-r--r-- | drivers/w1/w1.h | 113 |
1 files changed, 82 insertions, 31 deletions
diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h index abbddaf3f8e2..4f0a986e33e3 100644 --- a/drivers/w1/w1.h +++ b/drivers/w1/w1.h @@ -1,8 +1,8 @@ /* - * w1.h + * w1.h * * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> - * + * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -74,36 +74,86 @@ struct w1_slave int ttl; struct w1_master *master; - struct w1_family *family; - struct device dev; - struct completion dev_released; + struct w1_family *family; + struct device dev; + struct completion dev_released; - struct bin_attribute attr_bin; - struct device_attribute attr_name, attr_val; + struct bin_attribute attr_bin; + struct device_attribute attr_name; }; 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); }; +#define W1_MASTER_NEED_EXIT 0 +#define W1_MASTER_NEED_RECONNECT 1 + struct w1_master { struct list_head w1_master_entry; @@ -115,30 +165,31 @@ struct w1_master int slave_ttl; int initialized; u32 id; + int search_count; atomic_t refcnt; void *priv; int priv_size; - int need_exit; + long flags; + pid_t kpid; - struct semaphore mutex; + struct semaphore mutex; struct device_driver *driver; - struct device dev; - struct completion dev_released; - struct completion dev_exited; + struct device dev; + struct completion dev_released; + struct completion dev_exited; struct w1_bus_master *bus_master; u32 seq, groups; - struct sock *nls; + struct sock *nls; }; int w1_create_master_attributes(struct w1_master *); -void w1_destroy_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__ */ |