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path: root/include/linux/nvmem-provider.h
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2018-12-06nvmem: add new config optionBartosz Golaszewski1-0/+2
We want to add nvmem support for MTD. TI DaVinci is the first platform that will be using it, but only in non-DT mode. In order not to introduce any new interface to supporting of which we would have to commit - add a new config option that tells nvmem not to use the DT node of the parent device. This way we won't be creating nvmem devices corresponding with MTD partitions defined in device tree. By default MTD will set this new field to true. Once a set of bindings for MTD nvmem cells is agreed upon, we'll be able to remove this option. Signed-off-by: Bartosz Golaszewski <[email protected]> Signed-off-by: Srinivas Kandagatla <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2018-12-06nvmem: Move nvmem_type_str array to its only userAndy Shevchenko1-7/+0
Since we put static variable to a header file it's copied to each module that includes the header. But not all of them are actually using it. Move nvmem_type_str array to its only user to make a compiler happy: In file included from include/linux/rtc.h:18, from drivers/rtc/rtc-proc.c:15: include/linux/nvmem-provider.h:29:27: warning: 'nvmem_type_str' defined but not used [-Wunused-const-variable=] static const char * const nvmem_type_str[] = { ^~~~~~~~~~~~~~ Suggested-by: Alexandre Belloni <[email protected]> Suggested-by: Joe Perches <[email protected]> Cc: Srinivas Kandagatla <[email protected]> Signed-off-by: Andy Shevchenko <[email protected]> Signed-off-by: Srinivas Kandagatla <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2018-12-06nvmem: add type attributeAlexandre Belloni1-0/+16
Add a type attribute so userspace is able to know how the data is stored as this can help taking the correct decision when selecting which device to use. This will also help program display the proper warnings when burning fuses for example. Signed-off-by: Alexandre Belloni <[email protected]> Signed-off-by: Srinivas Kandagatla <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2018-09-28nvmem: use EOPNOTSUPP instead of ENOSYSBartosz Golaszewski1-3/+2
Checkpatch emits warnings when using ENOSYS. Some of the frameworks started using EOPNOTSUPP as return values for API functions when given subsystem is disabled in Kconfig. Signed-off-by: Bartosz Golaszewski <[email protected]> Signed-off-by: Srinivas Kandagatla <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2018-09-28nvmem: use SPDX license identifiersBartosz Golaszewski1-4/+1
Use SPDX license identiefiers to core nvmem files and remove GPL 2.0 license boilerplate. Signed-off-by: Bartosz Golaszewski <[email protected]> Signed-off-by: Srinivas Kandagatla <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2018-09-28nvmem: add support for cell infoBartosz Golaszewski1-9/+24
Add new structs and routines allowing users to define nvmem cells from machine code. This global list of entries is parsed when a provider is registered and cells are associated with the relevant nvmem_device struct. A possible improvement for the future is to allow users to register cell tables after the nvmem provider has been registered by updating the cell list at each call to nvmem_(add|del)_cell_table(). Signed-off-by: Bartosz Golaszewski <[email protected]> Signed-off-by: Srinivas Kandagatla <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2018-09-28nvmem: change the signature of nvmem_unregister()Bartosz Golaszewski1-6/+3
We switched the nvmem framework to using kref instead of manually checking the current number of users in nvmem_unregister() so this function can no longer fail. We also converted all remaining users that still checked the return value of nvmem_unregister() to using devm_nvmem_register(). Make the routine return void. Signed-off-by: Bartosz Golaszewski <[email protected]> Signed-off-by: Srinivas Kandagatla <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2018-05-14drivers: nvmem: Export nvmem_add_cells()Andrew Lunn1-0/+11
Not all platforms use device tree. It is useful to be able to add cells to a NVMEM device from code. Export nvmem_add_cells() so making this possible. This required changing the parameters a bit, so that just the cells and the number of cells are passed, not the whole nvmem config structure. Signed-off-by: Andrew Lunn <[email protected]> Reviewed-by: Andrey Smirnov <[email protected]> Signed-off-by: Srinivas Kandagatla <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2018-03-14nvmem: Introduce devm_nvmem_(un)register()Andrey Smirnov1-0/+17
Introduce devm_nvmem_register()/devm_nvmem_unregister() to make .remove() unnecessary in trivial drivers. Cc: Srinivas Kandagatla <[email protected]> Cc: Heiko Stuebner <[email protected]> Cc: Masahiro Yamada <[email protected]> Cc: Carlo Caione <[email protected]> Cc: Kevin Hilman <[email protected]> Cc: Matthias Brugger <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Signed-off-by: Andrey Smirnov <[email protected]> Signed-off-by: Srinivas Kandagatla <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2018-03-14nvmem: core: Allow specifying device name verbatimAndrey Smirnov1-0/+3
Add code to allow avoid having nvmem core append a numeric suffix to the end of the name by passing config->id of -1. Cc: Srinivas Kandagatla <[email protected]> Cc: Heiko Stuebner <[email protected]> Cc: Masahiro Yamada <[email protected]> Cc: Carlo Caione <[email protected]> Cc: Kevin Hilman <[email protected]> Cc: Matthias Brugger <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Signed-off-by: Andrey Smirnov <[email protected]> Signed-off-by: Srinivas Kandagatla <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2018-03-14nvmem: Document struct nvmem_configAndrey Smirnov1-0/+22
Add a simple description of struct nvmem_config and its fields. Cc: Srinivas Kandagatla <[email protected]> Cc: Heiko Stuebner <[email protected]> Cc: Masahiro Yamada <[email protected]> Cc: Carlo Caione <[email protected]> Cc: Kevin Hilman <[email protected]> Cc: Matthias Brugger <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Signed-off-by: Andrey Smirnov <[email protected]> Signed-off-by: Srinivas Kandagatla <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2017-07-10nvmem: include linux/err.h from headerArnd Bergmann1-0/+3
The new support for nvmem devices from the rtc layer caused a build error in some configurations: include/linux/nvmem-provider.h: In function 'nvmem_register': include/linux/nvmem-provider.h:51:9: error: implicit declaration of function 'ERR_PTR' [-Werror=implicit-function-declaration] This adds the missing include to ensure we can always include the header. Fixes: 697e5a47aa12 ("rtc: add generic nvmem support") Signed-off-by: Arnd Bergmann <[email protected]> Acked-by: Srinivas Kandagatla <[email protected]> Signed-off-by: Alexandre Belloni <[email protected]>
2016-05-01nvmem: core: remove regmap dependencySrinivas Kandagatla1-0/+10
nvmem uses regmap_raw_read/write apis to read/write data from providers, regmap raw apis stopped working with recent kernels which removed raw accessors on mmio bus. This resulted in broken nvmem for providers which are based on regmap mmio bus. This issue can be fixed temporarly by moving to other regmap apis, but we might hit same issue in future. Moving to interfaces based on read/write callbacks from providers would be more robust. This patch removes regmap dependency from nvmem and introduces read/write callbacks from the providers. Without this patch nvmem providers like qfprom based on regmap mmio bus would not work. Reported-by: Rajendra Nayak <[email protected]> Signed-off-by: Srinivas Kandagatla <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2016-03-01nvmem: Add backwards compatibility support for older EEPROM drivers.Andrew Lunn1-1/+3
Older drivers made an 'eeprom' file available in the /sys device directory. Have the NVMEM core provide this to retain backwards compatibility. Signed-off-by: Andrew Lunn <[email protected]> Acked-by: Srinivas Kandagatla <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2016-03-01nvmem: Add flag to export NVMEM to root onlyAndrew Lunn1-0/+1
Legacy AT24, AT25 EEPROMs are exported in sys so that only root can read the contents. The EEPROMs may contain sensitive information. Add a flag so the provide can indicate that NVMEM should also restrict access to root only. Signed-off-by: Andrew Lunn <[email protected]> Acked-by: Srinivas Kandagatla <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2015-08-05nvmem: Add a simple NVMEM framework for nvmem providersSrinivas Kandagatla1-0/+47
This patch adds just providers part of the framework just to enable easy review. Up until now, NVMEM drivers like eeprom were stored in drivers/misc, where they all had to duplicate pretty much the same code to register a sysfs file, allow in-kernel users to access the content of the devices they were driving, etc. This was also a problem as far as other in-kernel users were involved, since the solutions used were pretty much different from on driver to another, there was a rather big abstraction leak. This introduction of this framework aims at solving this. It also introduces DT representation for consumer devices to go get the data they require (MAC Addresses, SoC/Revision ID, part numbers, and so on) from the nvmems. Having regmap interface to this framework would give much better abstraction for nvmems on different buses. Signed-off-by: Maxime Ripard <[email protected]> [Maxime Ripard: intial version of eeprom framework] Signed-off-by: Srinivas Kandagatla <[email protected]> Tested-by: Stefan Wahren <[email protected]> Tested-by: Philipp Zabel <[email protected]> Tested-by: Rajendra Nayak <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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