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Diffstat (limited to 'drivers/w1')
-rw-r--r--drivers/w1/masters/ds2490.c25
1 files changed, 18 insertions, 7 deletions
diff --git a/drivers/w1/masters/ds2490.c b/drivers/w1/masters/ds2490.c
index 6fabf584395f..1b632d549e79 100644
--- a/drivers/w1/masters/ds2490.c
+++ b/drivers/w1/masters/ds2490.c
@@ -520,6 +520,7 @@ static int ds_touch_bit(struct ds_device *dev, u8 bit, u8 *tbit)
return 0;
}
+#if 0
static int ds_write_bit(struct ds_device *dev, u8 bit)
{
int err;
@@ -538,6 +539,7 @@ static int ds_write_bit(struct ds_device *dev, u8 bit)
return 0;
}
+#endif
static int ds_write_byte(struct ds_device *dev, u8 byte)
{
@@ -722,6 +724,7 @@ static u8 ds9490r_touch_bit(void *data, u8 bit)
return ret;
}
+#if 0
static void ds9490r_write_bit(void *data, u8 bit)
{
struct ds_device *dev = data;
@@ -729,13 +732,6 @@ static void ds9490r_write_bit(void *data, u8 bit)
ds_write_bit(dev, bit);
}
-static void ds9490r_write_byte(void *data, u8 byte)
-{
- struct ds_device *dev = data;
-
- ds_write_byte(dev, byte);
-}
-
static u8 ds9490r_read_bit(void *data)
{
struct ds_device *dev = data;
@@ -748,6 +744,14 @@ static u8 ds9490r_read_bit(void *data)
return bit & 1;
}
+#endif
+
+static void ds9490r_write_byte(void *data, u8 byte)
+{
+ struct ds_device *dev = data;
+
+ ds_write_byte(dev, byte);
+}
static u8 ds9490r_read_byte(void *data)
{
@@ -812,8 +816,15 @@ static int ds_w1_init(struct ds_device *dev)
dev->master.data = dev;
dev->master.touch_bit = &ds9490r_touch_bit;
+ /* read_bit and write_bit in w1_bus_master are expected to set and
+ * sample the line level. For write_bit that means it is expected to
+ * set it to that value and leave it there. ds2490 only supports an
+ * individual time slot at the lowest level. The requirement from
+ * pulling the bus state down to reading the state is 15us, something
+ * that isn't realistic on the USB bus anyway.
dev->master.read_bit = &ds9490r_read_bit;
dev->master.write_bit = &ds9490r_write_bit;
+ */
dev->master.read_byte = &ds9490r_read_byte;
dev->master.write_byte = &ds9490r_write_byte;
dev->master.read_block = &ds9490r_read_block;