diff options
| author | Serge Semin <fancer.lancer@gmail.com> | 2017-01-13 15:16:52 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-19 11:39:57 +0100 |
| commit | cfad6425382ec81acd073fdf24361e1c30b4cb36 (patch) | |
| tree | 4cdf265f4b8973108de7e332716809f1c93c9cc3 /drivers/misc/eeprom/Kconfig | |
| parent | 8e8e333179d6ea50fd0491b138e71dc9d98378ba (diff) | |
eeprom: Add IDT 89HPESx EEPROM/CSR driver
This driver provides an access to EEPROM of IDT PCIe-switches. IDT PCIe-
switches expose a simple SMBus interface to perform IO-operations from/to
EEPROM, which is located at private (so called Master) SMBus. The driver
creates a simple binary sysfs-file to have an access to the EEPROM using
the SMBus-slave interface in the i2c-device susfs-directory:
/sys/bus/i2c/devices/<bus>-<devaddr>/eeprom
In case if read-only flag is specified at dts-node of the device, User-space
applications won't be able to write to the EEPROM sysfs-node.
Additionally IDT 89HPESx SMBus interface has an ability to read/write
values of device CSRs. This driver exposes debugfs-file to perform simple
IO-operations using that ability for just basic debug purpose. Particularly
the next file is created in the specific debugfs-directory:
/sys/kernel/debug/idt_csr/
Format of the debugfs-file value is:
$ cat /sys/kernel/debug/idt_csr/<bus>-<devaddr>/<devname>;
<CSR address>:<CSR value>
So reading the content of the file gives current CSR address and it value.
If User-space application wishes to change current CSR address, it can just
write a proper value to the sysfs-file:
$ echo "<CSR address>" >
/sys/kernel/debug/idt_csr/<bus>-<devaddr>/<devname>
If it wants to change the CSR value as well, the format of the write
operation is:
$ echo "<CSR address>:<CSR value>" > \
/sys/kernel/debug/idt_csr/<bus>-<devaddr>/<devname>;
CSR address and value can be any of hexadecimal, decimal or octal format.
Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/eeprom/Kconfig')
| -rw-r--r-- | drivers/misc/eeprom/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/misc/eeprom/Kconfig b/drivers/misc/eeprom/Kconfig index c4e41c26649e..de58762097c4 100644 --- a/drivers/misc/eeprom/Kconfig +++ b/drivers/misc/eeprom/Kconfig @@ -100,4 +100,14 @@ config EEPROM_DIGSY_MTC_CFG If unsure, say N. +config EEPROM_IDT_89HPESX + tristate "IDT 89HPESx PCIe-swtiches EEPROM / CSR support" + depends on I2C && SYSFS + help + Enable this driver to get read/write access to EEPROM / CSRs + over IDT PCIe-swtich i2c-slave interface. + + This driver can also be built as a module. If so, the module + will be called idt_89hpesx. + endmenu |