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* w1: fix slave selection on big-endian systemsEvgeniy Polyakov2008-12-241-1/+3
| | | | | | | | | | | | | | | During test of the w1-gpio driver i found that in "w1.c:679 w1_slave_found()" the device id is converted to little-endian with "cpu_to_le64()", but its not converted back to cpu format in "w1_io.c:293 w1_reset_select_slave()". Based on a patch created by Andreas Hummel. [akpm@linux-foundation.org: remove unneeded cast] Reported-by: Andreas Hummel <andi_hummel@gmx.de> Signed-off-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1_MASTER_DS1WM should depend on HAVE_CLKAl Viro2008-11-301-1/+1
| | | | | | | | Uses clk_...() a lot Acked-by: rmk+kernel@arm.linux.org.uk Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1 OMAP: Fix OMAP LDP boot crashStanley.Miao2008-11-201-5/+5
| | | | | | | | | | OMAP LDP boot crash. This is because w1 subsystem changed the search interface, so update omap_hdq's search interface to follow the change. Signed-off-by: Stanley.Miao <stanley.miao@windriver.com> Signed-off-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hdq: bQ27000 HDQ Slave Interface DriverMadhusudhan Chikkature2008-11-133-1/+131
| | | | | | | | | Provide the BQ27000 slave interface driver. Signed-off-by: Madhusudhan Chikkature<madhu.cr@ti.com> Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hdq driver for OMAP2430/3430Madhusudhan Chikkature2008-11-133-0/+733
| | | | | | | | | | | | | | | | The HDQ/1-Wire module of TI OMAP2430/3430 platforms implement the hardware protocol of the master functions of the Benchmark HDQ and the Dallas Semiconductor 1-Wire protocols. These protocols use a single wire for communication between the master (HDQ/1-Wire controller) and the slave (HDQ/1-Wire external compliant device). This patch provides the HDQ driver to suppport TI OMAP2430/3430 platforms. Signed-off-by: Madhusudhan Chikkature<madhu.cr@ti.com> Acked-by: Felipe Balbi <felipe.balbi@nokia.com> Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* w1: export w1_read_8 functionMadhusudhan Chikkature2008-11-132-1/+3
| | | | | | | | | | | Export the w1_read_8 function for use of drivers. The OMAP HDQ driver(drivers/w1/masters/omap_hdq.c) uses this function. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Madhusudhan Chikkature<madhu.cr@ti.com> Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* x86: sysfs: kill owner field from attributeParag Warudkar2008-10-201-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Tejun's commit 7b595756ec1f49e0049a9e01a1298d53a7faaa15 made sysfs attribute->owner unnecessary. But the field was left in the structure to ease the merge. It's been over a year since that change and it is now time to start killing attribute->owner along with its users - one arch at a time! This patch is attempt #1 to get rid of attribute->owner only for CONFIG_X86_64 or CONFIG_X86_32 . We will deal with other arches later on as and when possible - avr32 will be the next since that is something I can test. Compile (make allyesconfig / make allmodconfig / custom config) and boot tested. akpm: the idea is that we put the declaration of sttribute.owner inside `#ifndef CONFIG_X86'. But that proved to be too ambitious for now because new usages kept on turning up in subsystem trees. [akpm: remove the ifdef for now] Signed-off-by: Parag Warudkar <parag.lkml@gmail.com> Cc: Greg KH <greg@kroah.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Tejun Heo <htejun@gmail.com> Cc: Len Brown <lenb@kernel.org> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Jean Delvare <khali@linux-fr.org> Cc: Roland Dreier <rolandd@cisco.com> Cc: David Brownell <david-b@pacbell.net> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* w1: new driver. DS2431 chipBernhard Weirich2008-10-162-0/+313
| | | | | | | | | [akpm@linux-foundation.org: minor fixlets and cleanups] Signed-off-by: Bernhard Weirich <bernhard.weirich@riedel.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Cc: Ben Gardner <bgardner@wabtec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: ds2490.c optimize ds_set_pullupDavid Fries2008-10-161-19/+45
| | | | | | | | | | | | | | | | Optimize the ds_set_pullup function. For a strong pullup to be sent the ds2490 has to have both the strong pullup mode enabled, and the specific write operation has to have the SPU bit enabled. Previously the write always had the SPU bit enabled and both the duration and model was set when a strong pullup was requested. Now the strong pullup mode is enabled at initialization time, the delay is updated only when the value changes, and the write SPU bit is set only when a strong pullup is required. This removes two or three bus transactions per strong pullup request. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: ds2490.c ds_write_block remove extra ds_wait_statusDavid Fries2008-10-161-2/+0
| | | | | | | | | Drop the extra ds_wait_status() in ds_write_block(). Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: ds2490.c magic number workDavid Fries2008-10-161-4/+12
| | | | | | | | | This replaces some magic numbers with marcos and corrects one marco. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: ds2490.c reset ds2490 in initDavid Fries2008-10-161-0/+21
| | | | | | | | | | | | | | | Reset the device in init as it can be in a bad state. This is necessary because a block write will wait for data to be placed in the output buffer and block any later commands which will keep accumulating and the device will not be idle. Another case is removing the ds2490 module while a bus search is in progress, somehow a few commands get through, but the input transfers fail leaving data in the input buffer. This will cause the next read to fail see the note in ds_recv_data. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: ds2490.c ds_reset remove ds_wait_statusDavid Fries2008-10-161-13/+2
| | | | | | | | | | ds_reset no longer calls ds_wait_status, the result wasn't used and it would only delay the following data operations. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: ds2490.c ds_dump_status reworkDavid Fries2008-10-161-50/+84
| | | | | | | | | | | | | | | | | | | - add result register #defines - rename ds_dump_status to ds_print_msg - rename ds_recv_status to ds_dump_status - ds_dump_status prints the requested status and no longer reads the status, this is because the second status read can return different data for example the result register - the result register will be printed, though limited to detecting a new device, detecting other values such as a short would require additional reporting methods - ST_EPOF was moved to ds_wait_status to clear the error condition sooner Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: ds2490.c simplify and fix ds_touch_bitDavid Fries2008-10-161-17/+4
| | | | | | | | | | | | | | | | | | | | | | Simplify and fix ds_touch_bit. If a device is attached in the middle of a bus search the status register will return more than the default 16 bytes. The additional bytes indicate that it has detected a new device. The way ds_wait_status is coded, if it doesn't read 16 status bytes it returns an error value. ds_touch_bit then will detect that error and return an error. In that case it doesn't read the input buffer and returns uninitialized data. It doesn't stop there. The next transaction will not expect the extra byte in the input buffer and the short read will cause an error and clear out both the old byte and new data in the input buffer. Just ignore the value of ds_wait_status. It is still required to wait until ds2490 is again idle and there is data to read when ds_recv_data is called. This also removes the while loop. None of the other commands wait and verify that the issued command is in the status register. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: ds2490.c disable bit read and writeDavid Fries2008-10-161-7/+18
| | | | | | | | | | | | | 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@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: ds2490.c ds_write_bit, grouping error, disable readbackDavid Fries2008-10-161-1/+6
| | | | | | | | | | | | ds_write_bit doesn't read the input buffer, so add COMM_ICP and a comment that it will no longer generate a read back data byte. If there is an extra data byte later on then it will cause an error and discard what data was there. Corrected operator ordering for ds_send_control. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: ds2490.c add support for strong pullupDavid Fries2008-10-161-38/+38
| | | | | | | | | | | | | | | | Add strong pullup support for ds2490 driver, also drop mdelay(750), which busy waits, usage in favour of msleep for long delays. Now with msleep only being called when the strong pullup is active, one wire bus operations are only taking minimal system overhead. The new set_pullup will only enable the strong pullup when requested, which is expected to be the only write operation that will benefit from a strong pullup. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: ds2490.c correct print messageDavid Fries2008-10-161-1/+2
| | | | | | | | | | | Corrected print message, it was writing not reading, this also prints the endpoint used for the write instead of hardcoding it. Failed to write 1-wire data to ep0x%x: err=%d. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: ds1wm.c msleep for resetDavid Fries2008-10-161-1/+3
| | | | | | | | | | | | | | | | | | | Like the previous w1_io.c reset coments and msleep patch, I don't have the hardware to verify the change, but I think it is safe. It also helps to see a comment like this in the code. "We'll wait a bit longer just to be sure." If they are going to calculate delaying 324.9us, but actually delay 500us, why not just give up the CPU and sleep? This is designed for a battery powered ARM system, avoiding busywaiting has to be good for battery life. I sent a request for testers March 7, 2008 to the Linux kernel mailing list and two developers who have patches for ds1wm.c, but I didn't get any respons. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: w1_io.c reset comments and msleepDavid Fries2008-10-161-1/+13
| | | | | | | | | | | | | w1_reset_bus, added some comments about the timing and switched to msleep for the later delay. I don't have the hardware to test the sleep after reset change. The one wire doesn't have a timing requirement between commands so it is fine. I do have the USB hardware and it would be in big trouble with 10ms interrupt transfers to find that the reset completed. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: w1.c s/printk/dev_dbg/David Fries2008-10-161-3/+3
| | | | | | | | | s/printk/dev_dbg/ Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: w1_int.c use first available master numberDavid Fries2008-10-161-6/+26
| | | | | | | | | | | Follow the example of other devices (like the joystick device). Pick the first available id for each detected device. Currently for USB devices, suspending and resuming would cause the number to increment. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: w1_therm consistent mutex access code cleanupDavid Fries2008-10-161-1/+1
| | | | | | | | | | | sl->master->mutex and dev->mutex refer to the same mutex variable, but be consistent and use the same set of pointers for the lock and unlock calls. It is less confusing (and one less pointer dereference this way). Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: w1_family, remove unused variable need_exitDavid Fries2008-10-162-7/+1
| | | | | | | | | | | Removed the w1_family structure member variable need_exit. It was only being set and never used. Even if it were to be used it is a polling type operation. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: w1_therm fix user buffer overflow and catDavid Fries2008-10-162-36/+20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fixed data reading bug by replacing binary attribute with device one. Switching the sysfs read from bin_attribute to device_attribute. The data is far under PAGE_SIZE so the binary interface isn't required. As the device_attribute interface will make one call to w1_therm_read per file open and buffer, the result is, the following problems go away. buffer overflow: Execute a short read on w1_slave and w1_therm_read_bin would still return the full string size worth of data clobbering the user space buffer when it returned. Switching to device_attribute avoids the buffer overflow problems. With the snprintf formatted output dealing with short reads without doing a conversion per read would have been difficult. bad behavior: `cat w1_slave` would cause two temperature conversions to take place. Previously the code assumed W1_SLAVE_DATA_SIZE would be returned with each read. It would not return 0 unless the offset was less than W1_SLAVE_DATA_SIZE. The result was the first read did a temperature conversion, filled the buffer and returned, the offset in the second read would be less than W1_SLAVE_DATA_SIZE and also fill the buffer and return, the third read would finnally have a big enough offset to return 0 and cause cat to stop. Now w1_therm_read will be called at most once per open. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: w1_slave_read_id read bug, use device_attributeDavid Fries2008-10-161-25/+10
| | | | | | | | | | | | Fix bug reading the id sysfs file. If less than the full 8 bytes were read, the next read would start at the first byte instead of continuing. It needed the offset added to memcpy, or the better solution was to replace it with the device attribute instead of bin attribute. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: new module parameter search_countDavid Fries2008-10-161-1/+3
| | | | | | | | | | Added a new module parameter search_count which allows overriding the default search count. -1 continual, 0 disabled, N that many times. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: recode w1_slave_found logicDavid Fries2008-10-161-20/+6
| | | | | | | | | | | Simplified the logic in w1_slave_found by using the new w1_attach_slave_device function to find a slave and mark it as active or add the device if the crc checks. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: be able to manually add and remove slavesDavid Fries2008-10-161-1/+137
| | | | | | | | | | | | sysfs entries were added to manually add and remove slave devices. This is useful if the automatic bus searching is disabled, and the device ids are already known. [akpm@linux-foundation.org: fix printk types] Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: feature, w1_therm.c use strong pullup and documentationDavid Fries2008-10-161-2/+13
| | | | | | | | | | Added strong pullup to thermal sensor driver and general documentation on the sensor. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: feature, enable hardware strong pullupDavid Fries2008-10-164-5/+131
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a strong pullup option to the w1 system. This supplies extra power for parasite powered devices. There is a w1_master_pullup sysfs entry and enable_pullup module parameter to enable or disable the strong pullup. The one wire bus requires at a minimum one wire and ground. The common wire is used for sending and receiving data as well as supplying power to devices that are parasite powered of which temperature sensors can be one example. The bus must be idle and left high while a temperature conversion is in progress, in addition the normal pullup resister on larger networks or even higher temperatures might not supply enough power. The pullup resister can't provide too much pullup current, because devices need to pull the bus down to write a value. This enables the strong pullup for supported hardware, which can supply more current when requested. Unsupported hardware will just delay with the bus high. The hardware USB 2490 one wire bus master has a bit on some commands which will enable the strong pullup as soon as the command finishes executing. To use strong pullup, call the new w1_next_pullup function to register the duration. The next write command will call set_pullup before sending the data, and reset the duration to zero once it returns. Switched from simple_strtol to strict_strtol. Signed-off-by: David Fries <david@fries.net> Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: w1_process, block or sleepDavid Fries2008-10-163-9/+17
| | | | | | | | | | | | | | | | The w1_process thread's sleeping and termination has been modified. msleep_interruptible was replaced by schedule_timeout and schedule to allow for kthread_stop and wake_up_process to interrupt the sleep and the unbounded sleeping when a bus search is disabled. The W1_MASTER_NEED_EXIT and flags variable were removed as they were redundant with kthread_should_stop and kthread_stop. If w1_process is sleeping, requesting a search will immediately wake it up rather than waiting for the end of msleep_interruptible previously. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: don't delay search startDavid Fries2008-10-162-22/+23
| | | | | | | | | | | | | | | Move the creation of the w1_process thread to after the device has been initialized. This way w1_process doesn't have to check to see if it has been initialized and the bus search can proceed without sleeping. That also eliminates two checks in the w1_process loop. The sleep now happens at the end of the loop not the beginning. Also added a comment for why the atomic_set was 2. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: abort search early on on exitDavid Fries2008-10-161-0/+5
| | | | | | | | | | | Early abort if the master driver or the hardware goes away in the middle of a bus search operation. The alternative is to spam the print buffer up to 64*64 times with read errors in the case of USB. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: fix deadlocks and remove w1_control_threadDavid Fries2008-10-167-122/+71
| | | | | | | | | | | | | | | | | | | | | | | w1_control_thread was removed which would wake up every second and process newly registered family codes and complete some final cleanup for a removed master. Those routines were moved to the threads that were previously requesting those operations. A new function w1_reconnect_slaves takes care of reconnecting existing slave devices when a new family code is registered or removed. The removal case was missing and would cause a deadlock waiting for the family code reference count to decrease, which will now happen. A problem with registering a family code was fixed. A slave device would be unattached if it wasn't yet claimed, then attached at the end of the list, two unclaimed slaves would cause an infinite loop. The struct w1_bus_master.search now takes a pointer to the struct w1_master device to avoid searching for it, which would have caused a lock ordering deadlock with the removal of w1_control_thread. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* w1/ds2482: Convert to a new-style driverJean Delvare2008-07-161-60/+44
| | | | | | | | The new-style ds2482 driver implements the optional detect() callback to cover the use cases of the legacy driver. I'm curious if anyone really needs this though, so it might be removed in the feature. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* drivers: replace remaining __FUNCTION__ occurrencesHarvey Harrison2008-04-301-1/+1
| | | | | | | | | __FUNCTION__ is gcc-specific, use __func__ Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Cc: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ds1wm: report bus reset errorAnton Vorontsov2008-03-051-9/+9
| | | | | | | | | | | | | | | The patch replaces dev_dbg() by dev_err(), so the user could actually see the error, instead of wondering why w1 doesn't work. The root cause of the bus reset error isn't yet debugged though, but this sometimes happens on iPaq H5555. And while I'm at it, some cosmetic cleanups also made (few lines were using spaces instead of tabs). Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com> Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ds1wm: should check for IS_ERR(clk) instead of NULLAnton Vorontsov2008-03-051-2/+3
| | | | | | | | | | | | | | On the error condition clk_get() returns ERR_PTR(..), so checking for NULL doesn't work. ds1wm module causes a kernel oops when ds1wm clock isn't registered. This patch converts NULL check to IS_ERR(), plus uses PTR_ERR() for the return code. Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com> Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* DS1WM: decouple host IRQ and INTR active state settingsPhilipp Zabel2008-02-071-4/+5
| | | | | | | | | | | | | The DS1WM driver incorrectly infers the IAS bit (1-wire interrupt active high) from IRQ settings. There are devices that have IAS=0 but still need the IRQ to trigger on a rising edge. With this patch, machines with DS1WM that need IAS=1 have to set .active_high=1 in the ds1wm_platform_data. Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com> Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Acked-by: Matt Reimer <mreimer@vpop.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* w1-gpio: add GPIO w1 bus master driverVille Syrjala2008-02-063-0/+135
| | | | | | | | | | | | Add a GPIO 1-wire bus master driver. The driver used the GPIO API to control the wire and the GPIO pin can be specified using platform data similar to i2c-gpio. The driver was tested with AT91SAM9260 + DS2401. Signed-off-by: Ville Syrjala <syrjala@sci.fi> Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: w1_therm.c standardize units to millidegrees CDavid Fries2008-02-061-1/+2
| | | | | | | | | | | | | | | | | | | Standardize the temperature units to millidegrees C for the two sensor conversion routines. Previously the routines were, w1_DS18B20_convert_temp degrees C w1_DS18S20_convert_temp millidegrees C Unfortunately this will break any program using the ds18b20 value as it will now be 1000 times bigger. Fortunately there can't be that many users out there, or some of these bugs will have been fixed by now, such as the negative C error (see previous patch) that makes me think the ds18b20 is the better choice to change because of the current bugs. Signed-off-by: David Fries <david@fries.net> Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* w1: remove unused and confusing variable.Evgeniy Polyakov2008-02-061-4/+0
| | | | | | | | | | Remvoe variable which actually is not used (except assigning it a value) and confusing break out of the family checking loop. Found by Harry Mason. Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Cc: Harry J Mason <hjm03r@ecs.soton.ac.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* i2c: normal_i2c can be made const (remaining drivers)Jean Delvare2008-01-271-1/+1
| | | | Signed-off-by: Jean Delvare <khali@linux-fr.org>
* W1: w1_therm.c is flagging 0C etc as invalidDavid Fries2008-01-221-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The extra rom[0] check is flagging valid temperatures as invalid when there is already a CRC data transmission check. w1_therm_read_bin() if (rom[8] == crc && rom[0]) verdict = 1; Requiring rom[0] to be non-zero will flag as invalid temperature conversions when the low byte is zero, specifically the temperatures 0C, 16C, 32C, 48C, -16C, -32C, and -48C. The CRC check is produced on the device for the previous 8 bytes and is required to ensure the data integrity in transmission. I don't see why the extra check for rom[0] being non-zero is in there. Evgeniy Polyakov didn't know either. Just for a check I unplugged the sensor, executed a temperature conversion, and read the results. The read was all ff's, which also failed the CRC, so it doesn't need to protect against a disconnected sensor. I have more extensive patches in the work, but these two trivial ones will do for today. I would like to hear from people who use the ds2490 USB to one wire dongle. 1 if you would be willing to test the patches as I currently only have the one sensor on a short parisite powered wire, 2 if there is any cheap sources for the ds2490. Signed-off-by: David Fries <david@fries.net> Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: w1_therm.c ds18b20 decode freezing temperatures correctlyDavid Fries2008-01-221-1/+1
| | | | | | | | | | | | | | | | | | | | Correct the decoding of negative C temperatures. The code did a binary OR of two bytes to make a 16 bit value, but assignd it to an integer. This caused the value to not be sign extended and to loose that it was a negative number in the assignment. Before the patch (in my freezer), w1_slave ed fe 4b 46 7f ff 03 10 e4 : crc=e4 YES ed fe 4b 46 7f ff 03 10 e4 t=4078 With the patch, e3 fe 4b 46 7f ff 0d 10 81 : crc=81 YES e3 fe 4b 46 7f ff 0d 10 81 t=-17 Signed-off-by: David Fries <david@fries.net> Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* w1: decrement slave counter only in ->release() callbackEvgeniy Polyakov2008-01-141-4/+2
| | | | | | | | | | | | | | Decrement the slave counter only in ->release() callback instead of both in ->release() and w1 control. Patch is based on debug work and preliminary patch made by Henri Laakso. Henri noticed in debug that this counter becomes negative after w1 slave device is physically removed. Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Cc: Henri Laakso <henri.laakso@wapice.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* W1: fix memset size errorLi Zefan2007-11-151-1/+1
| | | | | | | | | The size argument passed to memset is wrong. Signed-off-by Li Zefan <lizf@cn.fujitsu.com> Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Kbuild/doc: fix links to Documentation filesDirk Hohndel2007-10-301-1/+2
| | | | | | | Fix links to files in Documentation/* in various Kconfig files Signed-off-by: Dirk Hohndel <hohndel@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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