linux.git/drivers/mfd/dln2.c, branch v3.19 Linux kernel source tree mfd: dln2: add support for USB-SPI module 2014-11-25T16:18:57+00:00 Laurentiu Palcu laurentiu.palcu@intel.com 2014-11-07T12:45:14+00:00 21cf3318d675b6ceeb5a3ed82ffe467a2b6eaee4 Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com> 
Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>
mfd: dln2: A couple endian fixes 2014-11-19T17:12:59+00:00 Dan Carpenter dan.carpenter@oracle.com 2014-11-18T12:58:00+00:00 2fc2b4846c14c8c2d2c6e9114b4548f846521cfb Sparse catches a couple endian bugs. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Octavian Purdila <octavian.purdila@intel.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> 
Sparse catches a couple endian bugs.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Octavian Purdila <octavian.purdila@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
mfd: dln2: Add a limit check for invalid echo 2014-11-19T17:12:50+00:00 Octavian Purdila octavian.purdila@intel.com 2014-11-18T12:57:59+00:00 00ee7a37fdc3ed9bc6315f8af0270f2df55437d7 The echo field in dln2_transfer_complete comes directly from an USB transfer and we should not trust it is valid. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Octavian Purdila <octavian.purdila@intel.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> 
The echo field in dln2_transfer_complete comes directly from an USB
transfer and we should not trust it is valid.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
mfd: dln2: Fix _dln2_transfer return code 2014-11-19T17:12:19+00:00 Octavian Purdila octavian.purdila@intel.com 2014-11-18T12:57:57+00:00 7ca2b1c6724b150d8305ce06e4b07904ecbcb3fb If wait_for_completion_interruptible_timeout returns a positive value it may be propagated as the return value of _dln2_transfer. This contradicts the documentation of the function and exposes unnecessary internals to the callers. This patch makes sure to set the return value to 0 in that case. Reported-by: Julia Lawall <julia.lawall@lip6.fr> Signed-off-by: Octavian Purdila <octavian.purdila@intel.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> 
If wait_for_completion_interruptible_timeout returns a positive value
it may be propagated as the return value of _dln2_transfer. This
contradicts the documentation of the function and exposes unnecessary
internals to the callers.

This patch makes sure to set the return value to 0 in that case.

Reported-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
mfd: Add support for Diolan DLN-2 devices 2014-11-10T16:30:05+00:00 Octavian Purdila octavian.purdila@intel.com 2014-11-06T13:48:03+00:00 338a128142975439a19ab3c91480bc9d5a71f033 This patch implements the USB part of the Diolan USB-I2C/SPI/GPIO Master Adapter DLN-2. Details about the device can be found here: https://www.diolan.com/i2c/i2c_interface.html. Information about the USB protocol can be found in the Programmer's Reference Manual [1], see section 1.7. Because the hardware has a single transmit endpoint and a single receive endpoint the communication between the various DLN2 drivers and the hardware will be muxed/demuxed by this driver. Each DLN2 module will be identified by the handle field within the DLN2 message header. If a DLN2 module issues multiple commands in parallel they will be identified by the echo counter field in the message header. The DLN2 modules can use the dln2_transfer() function to issue a command and wait for its response. They can also register a callback that is going to be called when a specific event id is generated by the device (e.g. GPIO interrupts). The device uses handle 0 for sending events. [1] https://www.diolan.com/downloads/dln-api-manual.pdf Signed-off-by: Octavian Purdila <octavian.purdila@intel.com> Reviewed-by: Johan Hovold <johan@kernel.org> Signed-off-by: Lee Jones <lee.jones@linaro.org> 
This patch implements the USB part of the Diolan USB-I2C/SPI/GPIO
Master Adapter DLN-2. Details about the device can be found here:

https://www.diolan.com/i2c/i2c_interface.html.

Information about the USB protocol can be found in the Programmer's
Reference Manual [1], see section 1.7.

Because the hardware has a single transmit endpoint and a single
receive endpoint the communication between the various DLN2 drivers
and the hardware will be muxed/demuxed by this driver.

Each DLN2 module will be identified by the handle field within the DLN2
message header. If a DLN2 module issues multiple commands in parallel
they will be identified by the echo counter field in the message header.

The DLN2 modules can use the dln2_transfer() function to issue a
command and wait for its response. They can also register a callback
that is going to be called when a specific event id is generated by
the device (e.g. GPIO interrupts). The device uses handle 0 for
sending events.

[1] https://www.diolan.com/downloads/dln-api-manual.pdf

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>