kernel/drivers/platform/chrome/cros_ec_dev.h, branch linux-4.3.y

mfd: cros_ec: Support multiple EC in a system

2015-06-15T12:18:23Z

Chromebooks can have more than one Embedded Controller so the cros_ec device id has to be incremented for each EC registered. Add a new structure to represent multiple EC as different char devices (e.g: /dev/cros_ec, /dev/cros_pd). It connects to cros_ec_device and allows sysfs inferface for cros_pd. Also reduce number of allocated objects, make chromeos sysfs class object a static and add refcounting to prevent object deletion while command is in progress. Signed-off-by: Gwendal Grignou Reviewed-by: Dmitry Torokhov Signed-off-by: Javier Martinez Canillas Tested-by: Heiko Stuebner Acked-by: Lee Jones Acked-by: Olof Johansson Signed-off-by: Lee Jones

platform/chrome: Expose Chrome OS Lightbar to users

2015-02-26T23:45:16Z

This adds some sysfs entries to provide userspace control of the four-element LED "lightbar" on the Chromebook Pixel. This only instantiates the lightbar controls if the device actually exists. To prevent DoS attacks, this interface is limited to 20 accesses/second, although that rate can be adjusted by a privileged user. On Chromebooks without a lightbar, this should have no effect. On the Chromebook Pixel, you should be able to do things like this: $ cd /sys/devices/virtual/chromeos/cros_ec/lightbar $ echo 0x80 > brightness $ echo 255 > brightness $ $ cat sequence S0 $ echo konami > sequence $ cat sequence KONAMI $ $ cat sequence S0 And $ cd /sys/devices/virtual/chromeos/cros_ec/lightbar $ echo stop > sequence $ echo "4 255 255 255" > led_rgb $ echo "0 255 0 0 1 0 255 0 2 0 0 255 3 255 255 0" > led_rgb $ echo run > sequence Test the DoS prevention with this: $ cd /sys/devices/virtual/chromeos/cros_ec/lightbar $ echo 500 > interval_msec $ time (cat version version version version version version version) Signed-off-by: Bill Richardson Reviewed-by: Olof Johansson Tested-by: Doug Anderson Reviewed-by: Benson Leung Signed-off-by: Javier Martinez Canillas Tested-by: Gwendal Grignou Reviewed-by: Gwendal Grignou Signed-off-by: Olof Johansson

platform/chrome: Create sysfs attributes for the ChromeOS EC

2015-02-26T23:45:12Z

This adds the first few sysfs attributes for the Chrome OS EC. These controls are made available under /sys/devices/virtual/chromeos/cros_ec flashinfo - display current flash info reboot - tell the EC to reboot in various ways version - information about the EC software and hardware Future changes will build on this to add additional controls. From a root shell, you should be able to do things like this: cd /sys/devices/virtual/chromeos/cros_ec cat flashinfo cat version echo rw > reboot cat version echo ro > reboot cat version echo rw > reboot cat version echo cold > reboot That last command will reboot the AP too. Signed-off-by: Bill Richardson Reviewed-by: Olof Johansson Signed-off-by: Javier Martinez Canillas Tested-by: Gwendal Grignou Reviewed-by: Gwendal Grignou Signed-off-by: Olof Johansson

platform/chrome: Add Chrome OS EC userspace device interface

2015-02-26T23:45:06Z

This patch adds a device interface to access the Chrome OS Embedded Controller from user-space. Signed-off-by: Bill Richardson Reviewed-by: Simon Glass Signed-off-by: Javier Martinez Canillas Reviewed-by: Gwendal Grignou Tested-by: Gwendal Grignou Reviewed-by: Gwendal Grignou Signed-off-by: Olof Johansson