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path: root/drivers/base/regmap/regmap.c
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2011-09-19regmap: Incorporate the regcache core into regmapDimitris Papastamos
This patch incorporates the regcache core code into regmap. All previous patches have been no-ops essentially up to this point. The bulk read operation is not supported by regcache at the moment. This will be implemented incrementally. Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com> Tested-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-09-05regmap: Add support for device specific write and read flag masks.Lars-Peter Clausen
Some buses like SPI have no standard notation of read or write operations. The general scheme here is to set or clear specific bits in the register address to indicate whether the operation is a read or write. We already support having a read flag mask per bus, but as there is no standard the bits which need to be set or cleared differ between devices and vendors, thus we need a mechanism to specify them per device. This patch adds two new entries to the regmap_config struct, read_flag_mask and write_flag_mask. These will be or'ed onto the top byte when doing a read or write operation. If both masks are empty the device will fallback to the regmap_bus masks. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-09-05Merge branch 'regmap-linus' into regmap-nextMark Brown
2011-09-05regmap: Remove bitrotted module_put()sMark Brown
The conversion to per bus type registration functions means we don't need to do module_get()s to hold the bus types in memory (their users will link to them) so we removed all those calls. This left module_put() calls in the cleanup paths which aren't needed and which cause unbalanced puts if we ever try to unload anything. Reported-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-08-14regmap: Add functions to check for access on registersMark Brown
We're going to be using these in quite a few places so factor out the readable/writable/volatile/precious checks. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-08-08regmap: Skip precious registers when dumping registers via debugfsMark Brown
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-08-08regmap: Provide register map dump via debugfsMark Brown
Copy over the read parts of the ASoC debugfs implementation into regmap, allowing users to see what the register values the device has are at runtime. The implementation, especially the support for seeking, is mostly due to Dimitris Papastamos' work in ASoC. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-08-08regmap: Use a local header for API internalsMark Brown
Allowing the implementation to be multi-file. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-08-08regmap: Implement writable register checksMark Brown
This is mainly intended to be used by devices which can dynamically block register writes at runtime, for other devices there is usually limited value. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-08-08regmap: Add basic tracepointsMark Brown
Trace single register reads and writes, plus start/stop tracepoints for the actual I/O to see where we're spending time. This makes it easy to have always on logging without overwhelming the logs and also lets us take advantage of all the context and time information that the trace subsystem collects for us. We don't currently trace register values for bulk operations as this would add complexity and overhead parsing the cooked data that's being worked with. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-08-08Merge branches 'regmap-linus' and 'regmap-interface' into regmap-nextMark Brown
2011-08-08regmap: Just send the buffer directly for single register writesMark Brown
When doing a single register write we use work_buf for both the register and the value with the buffer formatted for sending directly to the device so we can just do a write() directly. This saves allocating a temporary buffer if we can't do gather writes and is likely to be faster than doing a gather write. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-08-08regmap: Allow devices to specify which registers are accessibleMark Brown
This is currently unused but we need to know which registers exist and their properties in order to implement diagnostics like register map dumps and the cache features. We use callbacks partly because properties can vary at runtime (eg, through access locks on registers) and partly because big switch statements are a good compromise between readable code and small data size for providing information on big register maps. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-07-24regmap: Fix bulk readsMark Brown
We should be reading the number of bytes we were asked for, not the size of a single register. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-07-23regmap: Add generic non-memory mapped register access APIMark Brown
There are many places in the tree where we implement register access for devices on non-memory mapped buses, especially I2C and SPI. Since hardware designers seem to have settled on a relatively consistent set of register interfaces this can be effectively factored out into shared code. There are a standard set of formats for marshalling data for exchange with the device, with the actual I/O mechanisms generally being simple byte streams. We create an abstraction for marshaling data into formats which can be sent on the control interfaces, and create a standard method for plugging in actual transport underneath that. This is mostly a refactoring and renaming of the bottom level of the existing code for sharing register I/O which we have in ASoC. A subsequent patch in this series converts ASoC to use this. The main difference in interface is that reads return values by writing to a location provided by a pointer rather than in the return value, ensuring we can use the full range of the type for register data. We also use unsigned types rather than ints for the same reason. As some of the devices can have very large register maps the existing ASoC code also contains infrastructure for managing register caches. This cache work will be moved over in a future stage to allow for separate review, the current patch only deals with the physical I/O. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Liam Girdwood <lrg@ti.com> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Grant Likely <grant.likely@secretlab.ca>