linux-kernel - [PATCH 0/4] mmc: sdio: Export CISTPL_VERS

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Date:   Mon, 27 Jul 2020 15:38:33 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/4] mmc: sdio: Export CISTPL_VERS_1 attributes to userspace

CISTPL_VERS_1 structure contains useful information for identification
of SDIO cards. It contains revision number according to which standard
is SDIO card compliant. And also it contain human readable info strings
which should contain manufacturer name or product information, like for
old PCMCIA cards. SDIO simplified specification 3.00 just contain
reference to PCMCIA metaformat specification for definition of that
CISTPL_VERS_1 structure itself.

Human readable SDIO card strings can be useful for userspace to do card
identification. Until now kernel exported to userspace only vendor and
device numbers but these numbers do not help to identify new or unknown
cards.


I have tested these patches with Marwell 88W8997 SDIO card (WiFi+Bluetooth)
and here is content of attributes available in userspace:

$ grep . /sys/class/mmc_host/mmc0/mmc0:0001/* /sys/class/mmc_host/mmc0/mmc0:0001/*/*
/sys/class/mmc_host/mmc0/mmc0:0001/device:0x9140
/sys/class/mmc_host/mmc0/mmc0:0001/info1:Marvell
/sys/class/mmc_host/mmc0/mmc0:0001/info2:Wireless Device ID: 50
/sys/class/mmc_host/mmc0/mmc0:0001/ocr:0x00200000
/sys/class/mmc_host/mmc0/mmc0:0001/rca:0x0001
/sys/class/mmc_host/mmc0/mmc0:0001/revision:1.0
/sys/class/mmc_host/mmc0/mmc0:0001/type:SDIO
/sys/class/mmc_host/mmc0/mmc0:0001/uevent:MMC_TYPE=SDIO
/sys/class/mmc_host/mmc0/mmc0:0001/uevent:SDIO_ID=02DF:9140
/sys/class/mmc_host/mmc0/mmc0:0001/uevent:SDIO_REVISION=1.0
/sys/class/mmc_host/mmc0/mmc0:0001/uevent:SDIO_INFO1=Marvell
/sys/class/mmc_host/mmc0/mmc0:0001/uevent:SDIO_INFO2=Wireless Device ID: 50
/sys/class/mmc_host/mmc0/mmc0:0001/uevent:SDIO_INFO3=
/sys/class/mmc_host/mmc0/mmc0:0001/vendor:0x02df
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:1/class:0x00
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:1/device:0x9141
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:1/info1:Marvell WiFi Device
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:1/modalias:sdio:c00v02DFd9141
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:1/revision:1.0
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:1/uevent:DRIVER=mwifiex_sdio
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:1/uevent:SDIO_CLASS=00
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:1/uevent:SDIO_ID=02DF:9141
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:1/uevent:SDIO_REVISION=1.0
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:1/uevent:SDIO_INFO1=Marvell WiFi Device
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:1/uevent:SDIO_INFO2=
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:1/uevent:MODALIAS=sdio:c00v02DFd9141
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:1/vendor:0x02df
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:2/class:0x00
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:2/device:0x9142
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:2/info1:Marvell Bluetooth Device
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:2/modalias:sdio:c00v02DFd9142
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:2/revision:1.0
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:2/uevent:DRIVER=btmrvl_sdio
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:2/uevent:SDIO_CLASS=00
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:2/uevent:SDIO_ID=02DF:9142
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:2/uevent:SDIO_REVISION=1.0
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:2/uevent:SDIO_INFO1=Marvell Bluetooth Device
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:2/uevent:SDIO_INFO2=
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:2/uevent:MODALIAS=sdio:c00v02DFd9142
/sys/class/mmc_host/mmc0/mmc0:0001/mmc0:0001:2/vendor:0x02df
/sys/class/mmc_host/mmc0/mmc0:0001/power/control:auto
/sys/class/mmc_host/mmc0/mmc0:0001/power/runtime_active_time:0
/sys/class/mmc_host/mmc0/mmc0:0001/power/runtime_status:unsupported
/sys/class/mmc_host/mmc0/mmc0:0001/power/runtime_suspended_time:0
/sys/class/mmc_host/mmc0/mmc0:0001/subsystem/drivers_autoprobe:1

As can be seen SDIO card does not provide all 4 info strings as required by
SDIO/PCMCIA specificaion and the third and the second strings are empty.


Pali Rohár (4):
  mmc: sdio: Check for CISTPL_VERS_1 buffer size
  mmc: sdio: Parse CISTPL_VERS_1 major and minor revision numbers
  mmc: sdio: Extend sdio_config_attr macro and use it also for modalias
  mmc: sdio: Export SDIO revision and info strings to userspace

 drivers/mmc/core/bus.c        | 12 ++++++++
 drivers/mmc/core/sd.c         | 36 +++++++++++++++++++++--
 drivers/mmc/core/sdio.c       | 24 ++++++++++++++++
 drivers/mmc/core/sdio_bus.c   | 54 ++++++++++++++++++++++++++---------
 drivers/mmc/core/sdio_cis.c   | 11 +++++++
 include/linux/mmc/card.h      |  2 ++
 include/linux/mmc/sdio_func.h |  2 ++
 7 files changed, 124 insertions(+), 17 deletions(-)

-- 
2.20.1