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[PATCH] w1: Cleans up usage of touch_bit/w1_read_bit/w1_write_bit.

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Cleans up usage of touch_bit/w1_read_bit/w1_write_bit.

Signed-off-by: Ben Gardner <bgardner@wabtec.com>
Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Evgeniy Polyakov 2005-06-04 01:21:46 +04:00 committed by Greg Kroah-Hartman
parent 4e470aa964
commit be57ce267f
3 changed files with 70 additions and 12 deletions
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8
drivers/w1/w1_int.c
View file

@ -121,6 +121,14 @@ int w1_add_master_device(struct w1_bus_master *master)
int retval = 0;
struct w1_netlink_msg msg;
/* validate minimum functionality */
if (!(master->touch_bit && master->reset_bus) &&
!(master->write_bit && master->read_bit))
{
printk(KERN_ERR "w1_add_master_device: invalid function set\n");
return(-EINVAL);
}
dev = w1_alloc_dev(w1_ids++, w1_max_slave_count, w1_max_slave_ttl, &w1_driver, &w1_device);
if (!dev)
return -ENOMEM;

70
drivers/w1/w1_io.c
View file

@ -55,15 +55,29 @@ void w1_delay(unsigned long tm)
udelay(tm * w1_delay_parm);
}
static void w1_write_bit(struct w1_master *dev, int bit);
static u8 w1_read_bit(struct w1_master *dev);
/**
* Generates a write-0 or write-1 cycle and samples the level.
*/
u8 w1_touch_bit(struct w1_master *dev, int bit)
{
if (dev->bus_master->touch_bit)
return dev->bus_master->touch_bit(dev->bus_master->data, bit);
else
else if (bit)
return w1_read_bit(dev);
else {
w1_write_bit(dev, 0);
return(0);
}
}
void w1_write_bit(struct w1_master *dev, int bit)
/**
* Generates a write-0 or write-1 cycle.
* Only call if dev->bus_master->touch_bit is NULL
*/
static void w1_write_bit(struct w1_master *dev, int bit)
{
if (bit) {
dev->bus_master->write_bit(dev->bus_master->data, 0);
@ -78,6 +92,12 @@ void w1_write_bit(struct w1_master *dev, int bit)
}
}
/**
* Writes 8 bits.
*
* @param dev the master device
* @param byte the byte to write
*/
void w1_write_8(struct w1_master *dev, u8 byte)
{
int i;
@ -86,10 +106,15 @@ void w1_write_8(struct w1_master *dev, u8 byte)
dev->bus_master->write_byte(dev->bus_master->data, byte);
else
for (i = 0; i < 8; ++i)
w1_write_bit(dev, (byte >> i) & 0x1);
w1_touch_bit(dev, (byte >> i) & 0x1);
}
u8 w1_read_bit(struct w1_master *dev)
/**
* Generates a write-1 cycle and samples the level.
* Only call if dev->bus_master->touch_bit is NULL
*/
static u8 w1_read_bit(struct w1_master *dev)
{
int result;
@ -104,6 +129,12 @@ u8 w1_read_bit(struct w1_master *dev)
return result & 0x1;
}
/**
* Reads 8 bits.
*
* @param dev the master device
* @return the byte read
*/
u8 w1_read_8(struct w1_master * dev)
{
int i;
@ -113,12 +144,20 @@ u8 w1_read_8(struct w1_master * dev)
res = dev->bus_master->read_byte(dev->bus_master->data);
else
for (i = 0; i < 8; ++i)
res |= (w1_read_bit(dev) << i);
res |= (w1_touch_bit(dev,1) << i);
return res;
}
void w1_write_block(struct w1_master *dev, u8 *buf, int len)
/**
* Writes a series of bytes.
*
* @param dev the master device
* @param buf pointer to the data to write
* @param len the number of bytes to write
* @return the byte read
*/
void w1_write_block(struct w1_master *dev, const u8 *buf, int len)
{
int i;
@ -129,6 +168,14 @@ void w1_write_block(struct w1_master *dev, u8 *buf, int len)
w1_write_8(dev, buf[i]);
}
/**
* Reads a series of bytes.
*
* @param dev the master device
* @param buf pointer to the buffer to fill
* @param len the number of bytes to read
* @return the number of bytes read
*/
u8 w1_read_block(struct w1_master *dev, u8 *buf, int len)
{
int i;
@ -145,9 +192,15 @@ u8 w1_read_block(struct w1_master *dev, u8 *buf, int len)
return ret;
}
/**
* Issues a reset bus sequence.
*
* @param dev The bus master pointer
* @return 0=Device present, 1=No device present or error
*/
int w1_reset_bus(struct w1_master *dev)
{
int result = 0;
int result;
if (dev->bus_master->reset_bus)
result = dev->bus_master->reset_bus(dev->bus_master->data) & 0x1;
@ -183,9 +236,8 @@ void w1_search_devices(struct w1_master *dev, w1_slave_found_callback cb)
w1_search(dev);
}
EXPORT_SYMBOL(w1_write_bit);
EXPORT_SYMBOL(w1_touch_bit);
EXPORT_SYMBOL(w1_write_8);
EXPORT_SYMBOL(w1_read_bit);
EXPORT_SYMBOL(w1_read_8);
EXPORT_SYMBOL(w1_reset_bus);
EXPORT_SYMBOL(w1_calc_crc8);

4
drivers/w1/w1_io.h
View file

@ -26,13 +26,11 @@
void w1_delay(unsigned long);
u8 w1_touch_bit(struct w1_master *, int);
void w1_write_bit(struct w1_master *, int);
void w1_write_8(struct w1_master *, u8);
u8 w1_read_bit(struct w1_master *);
u8 w1_read_8(struct w1_master *);
int w1_reset_bus(struct w1_master *);
u8 w1_calc_crc8(u8 *, int);
void w1_write_block(struct w1_master *, u8 *, int);
void w1_write_block(struct w1_master *, const u8 *, int);
u8 w1_read_block(struct w1_master *, u8 *, int);
void w1_search_devices(struct w1_master *dev, w1_slave_found_callback cb);