[PATCH] w1: Cleans up usage of touch_bit/w1_read_bit/w1_write_bit.
From: Greg KH
Date: Wed Jun 22 2005 - 00:21:12 EST
[PATCH] w1: Cleans up usage of touch_bit/w1_read_bit/w1_write_bit.
Cleans up usage of touch_bit/w1_read_bit/w1_write_bit.
Signed-off-by: Ben Gardner <bgardner@xxxxxxxxxx>
Signed-off-by: Evgeniy Polyakov <johnpol@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
commit be57ce267fd558c52d2389530c15618681b7cfa7
tree 74b9d71873a9bd3152c955114b846c251f7216a9
parent 4e470aa9642d49230bcdfbb393cf5a81da333aba
author Evgeniy Polyakov <johnpol@xxxxxxxxxxx> Sat, 04 Jun 2005 01:21:46 +0400
committer Greg Kroah-Hartman <gregkh@xxxxxxx> Tue, 21 Jun 2005 21:43:10 -0700
drivers/w1/w1_int.c | 8 ++++++
drivers/w1/w1_io.c | 70 ++++++++++++++++++++++++++++++++++++++++++++-------
drivers/w1/w1_io.h | 4 +--
3 files changed, 70 insertions(+), 12 deletions(-)
diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c
--- a/drivers/w1/w1_int.c
+++ b/drivers/w1/w1_int.c
@@ -121,6 +121,14 @@ int w1_add_master_device(struct w1_bus_m
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;
diff --git a/drivers/w1/w1_io.c b/drivers/w1/w1_io.c
--- a/drivers/w1/w1_io.c
+++ b/drivers/w1/w1_io.c
@@ -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,
}
}
+/**
+ * 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, u
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 *de
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,
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
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);
diff --git a/drivers/w1/w1_io.h b/drivers/w1/w1_io.h
--- a/drivers/w1/w1_io.h
+++ b/drivers/w1/w1_io.h
@@ -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);
-
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