The patch titled
W1: ds2490.c disable bit read and write
has been added to the -mm tree. Its filename is
w1-ds2490c-disable-bit-read-and-write.patch
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out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: W1: ds2490.c disable bit read and write
From: David Fries <david@xxxxxxxxx>
Don't export read and write bit operations, they didn't work, they weren't
used, and they can't be made to work. The one wire low level bit
operations expect to set high or low levels, the ds2490 hardware only
supports complete read or write time slots, better to just comment them
out.
Signed-off-by: David Fries <david@xxxxxxxxx>
Signed-off-by: Evgeniy Polyakov <johnpol@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/w1/masters/ds2490.c | 25 ++++++++++++++++++-------
1 file changed, 18 insertions(+), 7 deletions(-)
diff -puN drivers/w1/masters/ds2490.c~w1-ds2490c-disable-bit-read-and-write drivers/w1/masters/ds2490.c
--- a/drivers/w1/masters/ds2490.c~w1-ds2490c-disable-bit-read-and-write
+++ a/drivers/w1/masters/ds2490.c
@@ -520,6 +520,7 @@ static int ds_touch_bit(struct ds_device
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
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,
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
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->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;
_
Patches currently in -mm which might be from david@xxxxxxxxx are
w1-fix-deadlocks-and-remove-w1_control_thread.patch
w1-abort-search-early-on-on-exit.patch
w1-dont-delay-search-start.patch
w1-w1_process-block-or-sleep.patch
w1-feature-enable-hardware-strong-pullup.patch
w1-feature-w1_thermc-use-strong-pullup-and-documentation.patch
w1-be-able-to-manually-add-and-remove-slaves.patch
w1-recode-w1_slave_found-logic.patch
w1-new-module-parameter-search_count.patch
w1-document-add-remove-search_count-and-pullup.patch
w1-w1_slave_read_id-read-bug-use-device_attribute.patch
w1-w1_therm-fix-user-buffer-overflow-and-cat.patch
w1-w1_family-remove-unused-variable-need_exit.patch
w1-w1_therm-consistent-mutex-access-code-cleanup.patch
w1-w1_intc-use-first-available-master-number.patch
w1-w1c-s-printk-dev_dbg.patch
w1-w1_ioc-reset-comments-and-msleep.patch
w1-ds1wmc-msleep-for-reset.patch
w1-ds2490c-correct-print-message.patch
w1-ds2490c-add-support-for-strong-pullup.patch
w1-ds2490c-ds_write_bit-grouping-error-disable-readback.patch
w1-ds2490c-disable-bit-read-and-write.patch
w1-ds2490c-simplify-and-fix-ds_touch_bit.patch
w1-ds2490c-ds_dump_status-rework.patch
w1-ds2490c-ds_reset-remove-ds_wait_status.patch
w1-ds2490c-reset-ds2490-in-init.patch
w1-ds2490c-magic-number-work.patch
w1-ds2490c-ds_write_block-remove-extra-ds_wait_status.patch
w1-documentation-w1-masters-ds2490-update.patch
w1-ds2490c-optimize-ds_set_pullup.patch
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