platform/chrome: wilco_ec: Add support for raw commands in debugfs

Add a debugfs attribute that allows sending raw commands to the EC.
This is useful for development and debug but should not be enabled
in a production environment.

To test:
Get the EC firmware build date
First send the request command
> echo 00 f0 38 00 03 00 > raw
Then read the result. "12/21/18" is in the middle of the response
> cat raw
00 31 32 2f 32 31 2f 31 38 00 00 0f 01 00 01 00  .12/21/18.......

Get the EC firmware build date
First send the request command
> echo 00 f0 38 00 03 00 > raw
Then read the result. "12/21/18" is in the middle of the response
> cat raw
00 31 32 2f 32 31 2f 31 38 00 00 0f 01 00 01 00  .12/21/18.......

Signed-off-by: Duncan Laurie <dlaurie@google.com>
Signed-off-by: Nick Crews <ncrews@chromium.org>
[Fix off-by-one error in wilco_ec/debugfs.c]
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/platform_data/wilco-ec.h b/include/linux/platform_data/wilco-ec.h
index 0feb4b520a54..5344975afa1a 100644
--- a/include/linux/platform_data/wilco-ec.h
+++ b/include/linux/platform_data/wilco-ec.h
@@ -34,6 +34,7 @@
  * @data_buffer: Buffer used for EC communication.  The same buffer
  *               is used to hold the request and the response.
  * @data_size: Size of the data buffer used for EC communication.
+ * @debugfs_pdev: The child platform_device used by the debugfs sub-driver.
  */
 struct wilco_ec_device {
         struct device *dev;
@@ -43,6 +44,7 @@ struct wilco_ec_device {
         struct resource *io_packet;
         void *data_buffer;
         size_t data_size;
+        struct platform_device *debugfs_pdev;
 };
 
 /**