diff options
Diffstat (limited to 'Documentation/extcon/porting-android-switch-class')
| -rw-r--r-- | Documentation/extcon/porting-android-switch-class | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/Documentation/extcon/porting-android-switch-class b/Documentation/extcon/porting-android-switch-class index eb0fa5f4fe8..49c81caef84 100644 --- a/Documentation/extcon/porting-android-switch-class +++ b/Documentation/extcon/porting-android-switch-class @@ -25,8 +25,10 @@ MyungJoo Ham <myungjoo.ham@samsung.com> @print_state: no change but type change (switch_dev->extcon_dev) - switch_dev_register(sdev, dev) - => extcon_dev_register(edev, dev) - : no change but type change (sdev->edev) + => extcon_dev_register(edev) + : type change (sdev->edev) + : remove second param('dev'). if edev has parent device, should store + 'dev' to 'edev.dev.parent' before registering extcon device - switch_dev_unregister(sdev) => extcon_dev_unregister(edev) : no change but type change (sdev->edev) @@ -48,7 +50,7 @@ so that they are still compatible with legacy userspace processes. Extcon's extended features for switch device drivers with complex features usually required magic numbers in state value of switch_dev. With extcon, such magic numbers that - support multiple cables ( + support multiple cables are no more required or supported. 1. Define cable names at edev->supported_cable. 2. (Recommended) remove print_state callback. @@ -112,11 +114,8 @@ exclusive, the two cables cannot be in ATTACHED state simulteneously. ****** ABI Location - If "CONFIG_ANDROID" is enabled and "CONFIG_ANDROID_SWITCH" is -disabled, /sys/class/switch/* are created as symbolic links to -/sys/class/extcon/*. Because CONFIG_ANDROID_SWITCH creates -/sys/class/switch directory, we disable symboling linking if -CONFIG_ANDROID_SWITCH is enabled. + If "CONFIG_ANDROID" is enabled, /sys/class/switch/* are created +as symbolic links to /sys/class/extcon/*. The two files of switch class, name and state, are provided with extcon, too. When the multistate support (STEP 2 of CHAPTER 1.) is |