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path: root/drivers/misc/eeprom
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2019-02-20eeprom: at24: add support for 24c2048Adrian Bunk
[ Upstream commit 37cf28d3b5bca1b532a0b6aac722e7f2788a9294 ] Works with ST M24M02. Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Signed-off-by: Sasha Levin <sashal@kernel.org>
2018-08-21Merge branch 'i2c/for-4.19' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux Pull i2c updates from Wolfram Sang: - the core has now a lockless variant of i2c_smbus_xfer. Some open coded versions of this got removed in drivers. This also enables proper SCCB support in regmap. - locking got a more precise naming. i2c_{un}lock_adapter() had to go, and we know use i2c_lock_bus() consistently with flags like I2C_LOCK_ROOT_ADAPTER and I2C_LOCK_SEGMENT to avoid ambiguity. - the gpio fault injector got a new delicate testcase - the bus recovery procedure got fixed to handle the new testcase correctly - a new quirk flag for controllers not able to handle zero length messages together with driver updates to use it - new drivers: FSI bus attached I2C masters, GENI I2C controller, Owl family S900 - and a good set of driver improvements and bugfixes * 'i2c/for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (77 commits) i2c: rcar: implement STOP and REP_START according to docs i2c: rcar: refactor private flags i2c: core: ACPI: Make acpi_gsb_i2c_read_bytes() check i2c_transfer return value i2c: core: ACPI: Properly set status byte to 0 for multi-byte writes dt-bindings: i2c: rcar: Add r8a774a1 support dt-bindings: i2c: sh_mobile: Add r8a774a1 support i2c: imx: Simplify stopped state tracking i2c: imx: Fix race condition in dma read i2c: pasemi: remove hardcoded bus numbers on smbus i2c: designware: Add SPDX license tag i2c: designware: Convert to use struct i2c_timings i2c: core: Parse SDA hold time from firmware i2c: designware-pcidrv: Mark expected switch fall-through i2c: amd8111: Mark expected switch fall-through i2c: sh_mobile: use core to detect 'no zero length read' quirk i2c: xlr: use core to detect 'no zero length' quirk i2c: rcar: use core to detect 'no zero length' quirk i2c: stu300: use core to detect 'no zero length' quirk i2c: pmcmsp: use core to detect 'no zero length' quirk i2c: mxs: use core to detect 'no zero length' quirk ...
2018-08-05misc: eeprom: assignment outside the if statementParth Y Shah
Assignment of any variable should be kept outside the if statement Signed-off-by: Parth Y Shah <sparth1292@gmail.com> Reviewed-by: Jean Delvare <jdelvare@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-08-02eeprom: idt_89hpesx: clean up an error pointer vs NULL inconsistencyDan Carpenter
We check for IS_ERR_OR_NULL() here, but later we check the same thing for NULL only. It turns out that it can only be NULL so we can make the checking consistent by removing the ERR_PTR stuff. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-07-25eeprom: at24: Add support for address-width propertyAlan Chiang
Provide a flexible way to determine the addressing bits of eeprom. Pass the addressing bits to driver through address-width property. Signed-off-by: Alan Chiang <alanx.chiang@intel.com> Signed-off-by: Andy Yeh <andy.yeh@intel.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2018-07-07eeprom: at25: mark expected switch fall-throughsGustavo A. R. Silva
In preparation to enabling -Wimplicit-fallthrough, mark switch cases where we are expecting to fall through. Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-07-03eeprom: idt_89hpesx: remove redundant variable csrval_lenColin Ian King
Variable csrval_len is being assigned but is never used hence it is redundant and can be removed. Cleans up clang warning: warning: variable 'csrval_len' set but not used [-Wunused-but-set-variable] Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-06-14Merge branch 'i2c/for-4.18' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux Pull i2c updates from Wolfram Sang: - mainly feature additions to drivers (stm32f7, qup, xlp9xx, mlxcpld, ...) - conversion to use the i2c_8bit_addr_from_msg macro consistently - move includes to platform_data - core updates to allow the (still in review) I3C subsystem to connect - and the regular share of smaller driver updates * 'i2c/for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (68 commits) i2c: qup: fix building without CONFIG_ACPI i2c: tegra: Remove suspend-resume i2c: imx-lpi2c: Switch to SPDX identifier i2c: mxs: Switch to SPDX identifier i2c: busses: make use of i2c_8bit_addr_from_msg i2c: algos: make use of i2c_8bit_addr_from_msg i2c: rcar: document R8A77980 bindings i2c: qup: Add command-line parameter to override SCL frequency i2c: qup: Correct duty cycle for FM and FM+ i2c: qup: Add support for Fast Mode Plus i2c: qup: add probe path for Centriq ACPI devices i2c: robotfuzz-osif: drop pointless test i2c: robotfuzz-osif: remove pointless local variable i2c: rk3x: Don't print visible virtual mapping MMIO address i2c: opal: don't check number of messages in the driver i2c: ibm_iic: don't check number of messages in the driver i2c: imx: Switch to SPDX identifier i2c: mux: pca954x: merge calls to of_match_device and of_device_get_match_data i2c: mux: demux-pinctrl: use proper parent device for demux adapter i2c: mux: improve error message for failed symlink ...
2018-06-12treewide: kmalloc() -> kmalloc_array()Kees Cook
The kmalloc() function has a 2-factor argument form, kmalloc_array(). This patch replaces cases of: kmalloc(a * b, gfp) with: kmalloc_array(a * b, gfp) as well as handling cases of: kmalloc(a * b * c, gfp) with: kmalloc(array3_size(a, b, c), gfp) as it's slightly less ugly than: kmalloc_array(array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: kmalloc(4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. The tools/ directory was manually excluded, since it has its own implementation of kmalloc(). The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ type TYPE; expression THING, E; @@ ( kmalloc( - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | kmalloc( - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression COUNT; typedef u8; typedef __u8; @@ ( kmalloc( - sizeof(u8) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(__u8) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(char) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(unsigned char) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(u8) * COUNT + COUNT , ...) | kmalloc( - sizeof(__u8) * COUNT + COUNT , ...) | kmalloc( - sizeof(char) * COUNT + COUNT , ...) | kmalloc( - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - kmalloc + kmalloc_array ( - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ identifier SIZE, COUNT; @@ - kmalloc + kmalloc_array ( - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( kmalloc( - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kmalloc( - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kmalloc( - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kmalloc( - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( kmalloc( - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kmalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kmalloc( - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kmalloc( - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kmalloc( - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | kmalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ identifier STRIDE, SIZE, COUNT; @@ ( kmalloc( - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression E1, E2, E3; constant C1, C2, C3; @@ ( kmalloc(C1 * C2 * C3, ...) | kmalloc( - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | kmalloc( - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | kmalloc( - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | kmalloc( - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( kmalloc(sizeof(THING) * C2, ...) | kmalloc(sizeof(TYPE) * C2, ...) | kmalloc(C1 * C2 * C3, ...) | kmalloc(C1 * C2, ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - (E1) * E2 + E1, E2 , ...) | - kmalloc + kmalloc_array ( - (E1) * (E2) + E1, E2 , ...) | - kmalloc + kmalloc_array ( - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
2018-05-16eeprom: at24: provide a separate routine for creating dummy i2c clientsBartosz Golaszewski
Move the code responsible for creating the dummy i2c clients used by chips taking multiple slave addresses to a separate function. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Reviewed-by: Peter Rosin <peda@axentia.se>
2018-05-16eeprom: at24: provide and use a helper for releasing dummy i2c clientsBartosz Golaszewski
This allows us to drop two opencoded for loops. We also don't need to check if the i2c client is NULL before calling i2c_unregister_device(). Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Reviewed-by: Peter Rosin <peda@axentia.se>
2018-05-16eeprom: at24: use devm_nvmem_register()Bartosz Golaszewski
We now have a managed variant of nvmem_register(). Use it in at24_probe(). Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Reviewed-by: Peter Rosin <peda@axentia.se>
2018-05-16eeprom: at24: fix retrieving the at24_chip_data structureBartosz Golaszewski
Commit feb2f19b1e8f ("eeprom: at24: move platform data processing into a separate routine") introduced a bug where we incorrectly retireve the at24_chip_data structure. Remove the unnecessary ampersand operator. Fixes: feb2f19b1e8f ("eeprom: at24: move platform data processing into a separate routine") Reported-by: Vadim Pasternak <vadimp@mellanox.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2018-05-09eeprom: at24: fix retrieving the at24_chip_data structureBartosz Golaszewski
Commit feb2f19b1e8f ("eeprom: at24: move platform data processing into a separate routine") introduced a bug where we incorrectly retireve the at24_chip_data structure. Remove the unnecessary ampersand operator. Fixes: feb2f19b1e8f ("eeprom: at24: move platform data processing into a separate routine") Reported-by: Vadim Pasternak <vadimp@mellanox.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2018-04-04Merge tag 'char-misc-4.17-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc Pull char/misc updates from Greg KH: "Here is the big set of char/misc driver patches for 4.17-rc1. There are a lot of little things in here, nothing huge, but all important to the different hardware types involved: - thunderbolt driver updates - parport updates (people still care...) - nvmem driver updates - mei updates (as always) - hwtracing driver updates - hyperv driver updates - extcon driver updates - ... and a handful of even smaller driver subsystem and individual driver updates All of these have been in linux-next with no reported issues" * tag 'char-misc-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (149 commits) hwtracing: Add HW tracing support menu intel_th: Add ACPI glue layer intel_th: Allow forcing host mode through drvdata intel_th: Pick up irq number from resources intel_th: Don't touch switch routing in host mode intel_th: Use correct method of finding hub intel_th: Add SPDX GPL-2.0 header to replace GPLv2 boilerplate stm class: Make dummy's master/channel ranges configurable stm class: Add SPDX GPL-2.0 header to replace GPLv2 boilerplate MAINTAINERS: Bestow upon myself the care for drivers/hwtracing hv: add SPDX license id to Kconfig hv: add SPDX license to trace Drivers: hv: vmbus: do not mark HV_PCIE as perf_device Drivers: hv: vmbus: respect what we get from hv_get_synint_state() /dev/mem: Avoid overwriting "err" in read_mem() eeprom: at24: use SPDX identifier instead of GPL boiler-plate eeprom: at24: simplify the i2c functionality checking eeprom: at24: fix a line break eeprom: at24: tweak newlines eeprom: at24: refactor at24_probe() ...
2018-03-23eeprom: at24: use SPDX identifier instead of GPL boiler-plateBartosz Golaszewski
Replace the GPL (or later) header with the SPDX identifier for GPL-2.0+. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: simplify the i2c functionality checkingBartosz Golaszewski
Save one call and make code prettier by checking the i2c functionality in the beginning of at24_probe(), saving the relevant values and reusing them later. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: fix a line breakBartosz Golaszewski
Align the broken line with the opening parenthesis to stay consistent with the rest of the driver code. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: tweak newlinesBartosz Golaszewski
Remove the newline between the nvmem registration and its return value check. This is consistent with the rest of the driver code. Add a missing newline between two pdata checks to stay consistent with all the others. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: refactor at24_probe()Bartosz Golaszewski
The code in at24_probe() is pretty mangled. It can be cleaned up a bit by doing things one by one. Let's group the code by logic: parse and verify pdata, initialize the regmap, allocate and fill the fields of at24_data, allocate dummy i2c devices, initialize pm & register with nvmem. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: remove at24_platform_data from at24_dataBartosz Golaszewski
Not all fields from at24_platform_data are needed in at24_data. Let's keep just the ones we need and not carry the whole platform_data structure all the time. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: move platform data processing into a separate routineBartosz Golaszewski
This driver can receive its device data from different sources depending on the system. Move the entire code processing platform data, device tree and acpi into a separate function. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: switch to using probe_new() from the i2c frameworkBartosz Golaszewski
Use the new probe() style for i2c drivers. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: provide and use at24_base_client_dev()Bartosz Golaszewski
Use a helper function for accessing the device struct of the base i2c client. This routine is named in a way that reflects its purpose unlike the previously hand-coded dereferencing. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: readability tweak in at24_probe()Bartosz Golaszewski
Use a helper variable for the size we want to allocate with devm_kzalloc() and save an ugly line break. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: use a helper variable for devBartosz Golaszewski
We use the &client->dev construct all over in at24_probe(). Use a helper variable which is more readable and allows to avoid a couple unnecessary line breaks. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: rename chip to pdata in at24_probe()Bartosz Golaszewski
Reflect the purpose of this variable: it contains platform data so name it such. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: rename at24_get_pdata()Bartosz Golaszewski
As preparation for at24_probe() refactoring: rename at24_get_pdata() to at24_properties_to_pdata(). We're doing it because we'll move the pdata parsing code into a separate function which will be called at24_get_pdata(). Current routine with that name actually parses the device properties so change its name to reflect its purpose. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: don't check if byte_len is a power of 2Bartosz Golaszewski
We support certain models the size of which is not a power of 2. This is not a reason to emit a warning. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: make struct initialization uniform in at24_probe()Bartosz Golaszewski
When zeroing structs, use "{ }" everywhere. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: drop redundant variable in at24_write()Bartosz Golaszewski
We can reuse ret instead of defining a loop-local status variable. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: drop redundant variable in at24_read()Bartosz Golaszewski
We can reuse ret instead of defining a loop-local status variable. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: remove code separatorsBartosz Golaszewski
These are just two left-overs from times when this driver was bigger. They are not really useful anymore. Remove them. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: arrange local variablesBartosz Golaszewski
Arrange declarations of local variables by line length as visually it's easier to read. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: remove nvmem_config from at24_dataBartosz Golaszewski
This structure only needs to exist during the call to nvmem_register(). Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at24: disable regmap lockingBartosz Golaszewski
We use our own mutex for locking. Disable the regmap-specific locking. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-23eeprom: at25: sizeof t should be sizeof(t)Devang Panchal
Resolved checkpatch warning "sizeof t should be sizeof(t)" issue found by checkpatch. Signed-off-by: Devang Panchal <devang.panchal@softnautics.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-02-14spi: spi-gpio: Rewrite to use GPIO descriptorsLinus Walleij
This converts the bit-banged GPIO SPI driver to looking up and using GPIO descriptors to get a handle on GPIO lines for SCK, MOSI, MISO and all CS lines. All existing board files are converted in one go to keep it all consistent. With these conversions I rarely find any interrim steps that makes any sense. Device tree probing and GPIO handling should work like before also after this patch. For board files, we stop using controller data to pass the GPIO line for chip select, instead we pass this as a GPIO descriptor lookup like everything else. In some s3c24xx machines the names of the SPI devices were set to "spi-gpio" rather than "spi_gpio" which can never have worked, I fixed it working (I guess) as part of this patch set. Sometimes I wonder how this code got upstream in the first place, it obviously is not tested. mach-s3c64xx/mach-smartq.c has the same problem and additionally defines the *same* GPIO line for MOSI and MISO which is not going to be accepted by gpiolib. As the lines were number 1,2,2 I assumed it was a typo and use lines 1,2,3. A comment gives awat that line 0 is chip select though no actual SPI device is provided for the LCD supposed to be on this bit-banged SPI bus. I left it intact instead of just deleting the bus though. Kill off board file code that try to initialize the SPI lines to the same values that they will later be set by the spi_gpio driver anyways. Given the huge number of weird things in these board files I do not think this code is very tested or put in with much afterthought anyways. In order to assert that we do not get performance regressions on this crucial bing-banged driver, a ran a script like this dumping the Ilitek ILI9322 regmap 10000 times (it has no caching obviously) on an otherwise idle system in two iterations before and after the patches: #!/bin/sh for run in `seq 10000` do cat /debug/regmap/spi0.0/registers > /dev/null done Before the patch: time test.sh real 3m 41.03s user 0m 29.41s sys 3m 7.22s time test.sh real 3m 44.24s user 0m 32.31s sys 3m 7.60s After the patch: time test.sh real 3m 41.32s user 0m 28.92s sys 3m 8.08s time test.sh real 3m 39.92s user 0m 30.20s sys 3m 5.56s So any performance differences seems to be in the error margin. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2018-02-04Merge branch 'i2c/for-4.16' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux Pull i2c updates from Wolfram Sang: "I2C has the following changes for you: - new flag to mark DMA safe buffers in i2c_msg. Also, some infrastructure around it. And docs. - huge refactoring of the at24 driver led by the new maintainer Bartosz - update I2C bus recovery to send STOP after recovery - conversion from gpio to gpiod for I2C bus recovery - adding a fault-injector to the i2c-gpio driver - lots of small driver improvements, and bigger ones to i2c-sh_mobile" * 'i2c/for-4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (99 commits) i2c: mv64xxx: Add myself as maintainer for this driver i2c: mv64xxx: Fix clock resource by adding an optional bus clock i2c: mv64xxx: Remove useless test before clk_disable_unprepare i2c: mxs: use true and false for boolean values i2c: meson: update doc description to fix build warnings i2c: meson: add configurable divider factors dt-bindings: i2c: update documentation for the Meson-AXG i2c: imx-lpi2c: add runtime pm support i2c: rcar: fix some trivial typos in comments i2c: davinci: fix the cpufreq transition i2c: rk3x: add proper kerneldoc header i2c: rk3x: account for const type of of_device_id.data i2c: acorn: remove outdated path from file header i2c: acorn: add MODULE_LICENSE tag i2c: rcar: implement bus recovery i2c: send STOP after successful bus recovery i2c: ensure SDA is released in recovery if SDA is controllable i2c: add 'set_sda' to bus_recovery_info i2c: add identifier in declarations for i2c_bus_recovery i2c: make kerneldoc about bus recovery more precise ...
2018-01-02eeprom: at24: extend the list of chips supported in DTBartosz Golaszewski
Add all supported at24 variants to the of_match table. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
2018-01-02Merge 4.15-rc6 into char-misc-nextGreg Kroah-Hartman
We want the fixes in here as well. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-01-01eeprom: at24: add support for the write-protect pinBartosz Golaszewski
AT24 EEPROMs have a write-protect pin, which - when pulled high - inhibits writes to the upper quadrant of memory (although it has been observed that on some chips it disables writing to the entire memory range). On some boards, this pin is connected to a GPIO and pulled high by default, which forces the user to manually change its state before writing. On linux this means that we either need to hog the line all the time, or set the GPIO value before writing from outside of the at24 driver. Make the driver check if the write-protect GPIO was defined in the device tree and pull it low whenever writing to the EEPROM. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
2018-01-01eeprom: at24: remove temporary fix for at24mac402 sizeSven Van Asbroeck
The chip size passed via devicetree, i2c, or acpi device ids is now no longer limited to a power of two. So the temporary fix can be removed. Signed-off-by: Sven Van Asbroeck <svendev@arcx.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2018-01-01eeprom: at24: convert magic numbers to structsSven Van Asbroeck
Fundamental properties such as capacity and page size differ among at24-type chips. But these chips do not have an id register, so this can't be discovered at runtime. Traditionally, at24-type eeprom properties were determined in two ways: - by passing a 'struct at24_platform_data' via platform_data, or - by naming the chip type in the devicetree, which passes a 'magic number' to probe(), which is then converted to a 'struct at24_platform_data'. Recently a bug was discovered because the magic number rounds down all chip sizes to the lowest power of two. This was addressed by a work-around commit 5478e478eee3 ("eeprom: at24: correctly set the size for at24mac402"), with the wish that magic numbers should over time be converted to structs. This patch replaces the magic numbers with 'struct at24_chip_data'. Signed-off-by: Sven Van Asbroeck <svendev@arcx.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2018-01-01eeprom: at24: code shrinkBartosz Golaszewski
A regmap_config struct is pretty big and declaring two of them statically just to tweak the reg_bits value adds unnecessary bloat. Declare the regmap config locally in at24_probe() instead. Bloat-o-meter output for ARM: add/remove: 0/2 grow/shrink: 1/0 up/down: 4/-272 (-268) Function old new delta at24_probe 1560 1564 +4 regmap_config_8 136 - -136 regmap_config_16 136 - -136 Total: Before=7012, After=6744, chg -3.82% Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2018-01-01eeprom: at24: use a common prefix for all symbols in at24.cBartosz Golaszewski
There are a couple symbols defined in the driver source file which are missing the at24_ prefix. This patch fixes that. For module params: use module_param_named() in order to not break userspace. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2018-01-01eeprom: at24: fix coding style issuesBartosz Golaszewski
Fix issues reported by checkpatch for at24.c. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2018-01-01eeprom: at24: support eeproms that do not auto-rollover readsSven Van Asbroeck
Some multi-address eeproms in the at24 family may not automatically roll-over reads to the next slave address. On those eeproms, reads that straddle slave boundaries will not work correctly. Solution: Mark such eeproms with a flag that prevents reads straddling slave boundaries. Add the AT24_FLAG_NO_RDROL flag to the eeprom entry in the device_id table, or add 'no-read-rollover' to the eeprom devicetree entry. Note that I have not personally enountered an at24 chip that does not support read rollovers. They may or may not exist. However, my hardware requires this functionality because of a quirk. Signed-off-by: Sven Van Asbroeck <svendev@arcx.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2018-01-01eeprom: at24: remove now unneeded smbus-related codeHeiner Kallweit
Remove remaining now unneeded code dealing with SMBUS details. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2018-01-01eeprom: at24: remove old read functionsHeiner Kallweit
Remove the old and now unused read functions. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
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