Commit Graph

16 Commits

Author SHA1 Message Date
Gustavo A. R. Silva 4db7e1786d i2c: busses: Use fallthrough pseudo-keyword
Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1].

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Acked-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-07-23 22:04:08 +02:00
Wolfram Sang 468ed57fd2 i2c: slave-eeprom: update documentation to recent changes
Support for 16-bit addresses has been added, so remove it from the todo
list. Also, in the introductory sentence, may clear we talk about "slave
IP cores" to make reading easier.

Fixes: 82d5148154 ("i2c-eeprom_slave: Add support for more eeprom models")
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-28 18:06:10 +02:00
Wolfram Sang bee0d92c89 i2c: slave-eeprom: skip useless initialization
We have a kzalloced struct, no need to init to 0.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-28 18:05:56 +02:00
Wolfram Sang 5c71ca4d4f i2c: slave-eeprom: add support for 24c512 EEPROMs
I don't plan to support every EEPROM type, but the 24c512 ones need a
tiny code update, so let's have that upstream.

Reported-by: Patrick Williams <patrick@stwcx.xyz>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Patrick Williams <patrick@stwcx.xyz>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-20 15:25:55 +02:00
Björn Ardö e804f0a78e i2c: slave-eeprom: Make it possible to pre-load eeprom data
If the slave eeprom has a "firmware-name" in devicetree, then pre-load
the data in the eeprom with this file. Otherwise we init the eeprom with
0xFF.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Signed-off-by: Björn Ardö <bjorn.ardo@axis.com>
[wsa: some cosmetic changes]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-04-26 09:39:55 +02:00
chenqiwu 6b060d8a09 i2c: use kobj_to_dev() API
Use kobj_to_dev() API instead of container_of().

Signed-off-by: chenqiwu <chenqiwu@xiaomi.com>
Reviewed-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-03-10 10:50:08 +01:00
Björn Ardö 11af27f494 i2c: slave-eeprom: Add read only mode
Add read-only versions of all EEPROMs. These versions are read-only
on the i2c side, but can be written from the sysfs side.

Signed-off-by: Björn Ardö <bjorn.ardo@axis.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2019-09-28 20:44:12 +02:00
Björn Ardö fe050f9907 i2c: slave-eeprom: Add comment about address handling
The behaviour of the EEPROM in the case where we only send an 8bit
address to a 16bit address EEPROM is not defined. Added comment about
that the slave-eeprom might behave differently from how an actual device
does (only one model measured).

Reported-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Björn Ardö <bjorn.ardo@axis.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2019-09-05 22:26:04 +02:00
Björn Ardö 82d5148154 i2c-eeprom_slave: Add support for more eeprom models
Add a 32 and a 64 kbit memory. These needs 16 bit address
so added support for that as well.

Signed-off-by: Björn Ardö <bjorn.ardo@axis.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2019-09-04 23:08:24 +02:00
Thomas Gleixner b886d83c5b treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation version 2 of the license

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 315 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Armijn Hemel <armijn@tjaldur.nl>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190531190115.503150771@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:37:17 +02:00
Krzysztof Kozlowski 069d5b745b i2c: Drop owner assignment from i2c_driver
i2c_driver does not need to set an owner because i2c_register_driver()
will set it.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2015-08-10 08:37:35 +02:00
Vladimir Zapolskiy 1f023297f7 i2c: slave eeprom: clean up sysfs bin attribute read()/write()
The change removes redundant sysfs binary file boundary checks,
since this task is already done on caller side in fs/sysfs/file.c

Note, on file size overflow read() now returns 0, and this is a
correct and expected EOF notification according to POSIX.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2015-07-31 13:32:30 +02:00
Wolfram Sang 98e982b3a2 i2c: slave-eeprom: add more info when to increase the pointer
It is a bit subtle when to correctly increase the buffer index when
reading. Make this clearer by adding some more comments and pointers to
the docs.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2015-03-27 16:53:40 +01:00
Wolfram Sang 5b77d162a3 i2c: slave: rework the slave API
After more discussion, brave users, and additional datasheet evaluation,
some API updates for the new I2C slave framework became imminent. The
slave events now get some easier to understand naming. Also, the event
handling has been simplified to only need a single call to the slave
callback when an action by the backend is required.

Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2015-03-27 16:53:38 +01:00
Wolfram Sang 2541f7f4c1 i2c: slave-eeprom: fix boundary check when using sysfs
Due to a copy&paste error, the last byte of the shared memory was not
accessible via sysfs.

Reported-by: Debora Grosse <debora@mds.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2015-01-24 05:43:44 +01:00
Wolfram Sang 389be323cf i2c: slave-eeprom: add eeprom simulator driver
The first user of the i2c-slave interface is an eeprom simulator. It is
a shared memory which can be accessed by the remote master via I2C and
locally via sysfs.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2014-12-11 22:25:54 +01:00