/*
- * 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
struct w1_reg_num
{
+#if defined(__LITTLE_ENDIAN_BITFIELD)
__u64 family:8,
id:48,
crc:8;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+ __u64 crc:8,
+ id:48,
+ family:8;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
};
#ifdef __KERNEL__
#include <linux/completion.h>
#include <linux/device.h>
-
-#include <net/sock.h>
-
-#include <asm/semaphore.h>
+#include <linux/mutex.h>
#include "w1_family.h"
#define W1_SLAVE_DATA_SIZE 128
#define W1_SEARCH 0xF0
-#define W1_CONDITIONAL_SEARCH 0xEC
+#define W1_ALARM_SEARCH 0xEC
#define W1_CONVERT_TEMP 0x44
#define W1_SKIP_ROM 0xCC
#define W1_READ_SCRATCHPAD 0xBE
#define W1_READ_PSUPPLY 0xB4
#define W1_MATCH_ROM 0x55
-#define W1_SLAVE_ACTIVE (1<<0)
+#define W1_SLAVE_ACTIVE 0
struct w1_slave
{
atomic_t refcnt;
u8 rom[9];
u32 flags;
+ int ttl;
struct w1_master *master;
- struct w1_family *family;
- struct device dev;
- struct completion dev_released;
-
- struct bin_attribute attr_bin;
- struct device_attribute attr_name, attr_val;
+ struct w1_family *family;
+ void *family_data;
+ struct device dev;
+ struct completion released;
};
+typedef void (* w1_slave_found_callback)(void *, 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);
+ /** the first parameter in all the functions below */
+ void *data;
+
+ /**
+ * Sample the line level
+ * @return the level read (0 or 1)
+ */
+ u8 (*read_bit)(void *);
+
+ /** Sets the line level */
+ void (*write_bit)(void *, 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)(void *, u8);
+
+ /**
+ * Reads a bytes. Same as 8 touch_bit(1) calls.
+ * @return the byte read
+ */
+ u8 (*read_byte)(void *);
+
+ /**
+ * Writes a byte. Same as 8 touch_bit(x) calls.
+ */
+ void (*write_byte)(void *, u8);
+
+ /**
+ * Same as a series of read_byte() calls
+ * @return the number of bytes read
+ */
+ u8 (*read_block)(void *, u8 *, int);
+
+ /** Same as a series of write_byte() calls */
+ void (*write_block)(void *, const u8 *, int);
+
+ /**
+ * Combines two reads and a smart write for ROM searches
+ * @return bit0=Id bit1=comp_id bit2=dir_taken
+ */
+ u8 (*triplet)(void *, 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)(void *);
+
+ /** Really nice hardware can handles the different types of ROM search */
+ void (*search)(void *, u8, 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;
struct list_head slist;
int max_slave_count, slave_count;
unsigned long attempts;
+ int slave_ttl;
int initialized;
u32 id;
+ int search_count;
atomic_t refcnt;
void *priv;
int priv_size;
- int need_exit;
- pid_t kpid;
- wait_queue_head_t kwait;
- struct semaphore mutex;
+ long flags;
+
+ struct task_struct *thread;
+ struct mutex mutex;
struct device_driver *driver;
- struct device dev;
- struct completion dev_released;
- struct completion dev_exited;
+ struct device dev;
struct w1_bus_master *bus_master;
- u32 seq, groups;
- struct sock *nls;
+ u32 seq;
};
int w1_create_master_attributes(struct w1_master *);
-void w1_destroy_master_attributes(struct w1_master *);
+void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb);
+void w1_search_devices(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb);
+struct w1_slave *w1_search_slave(struct w1_reg_num *id);
+void w1_search_process(struct w1_master *dev, u8 search_type);
+struct w1_master *w1_search_master_id(u32 id);
+
+u8 w1_triplet(struct w1_master *dev, int bdir);
+void w1_write_8(struct w1_master *, u8);
+int w1_reset_bus(struct w1_master *);
+u8 w1_calc_crc8(u8 *, int);
+void w1_write_block(struct w1_master *, const u8 *, int);
+u8 w1_read_block(struct w1_master *, u8 *, int);
+int w1_reset_select_slave(struct w1_slave *sl);
+
+static inline struct w1_slave* dev_to_w1_slave(struct device *dev)
+{
+ return container_of(dev, struct w1_slave, dev);
+}
+
+static inline struct w1_slave* kobj_to_w1_slave(struct kobject *kobj)
+{
+ return dev_to_w1_slave(container_of(kobj, struct device, kobj));
+}
+
+static inline struct w1_master* dev_to_w1_master(struct device *dev)
+{
+ return container_of(dev, struct w1_master, dev);
+}
+
+extern struct device_driver w1_master_driver;
+extern struct device w1_master_device;
+extern int w1_max_slave_count;
+extern int w1_max_slave_ttl;
+extern struct list_head w1_masters;
+extern struct mutex w1_mlock;
+
+extern int w1_process(void *);
#endif /* __KERNEL__ */
git://git.onelab.eu / linux-2.6.git / blobdiff