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https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git
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22c040fa21
On many boards, communication between the kernel and the Embedded Controller happens over an LPC bus. In these cases, the kernel config CONFIG_CROS_EC_LPC is enabled. Some of these LPC boards contain a Microchip Embedded Controller (MEC) that is different from the regular EC. On these devices, the same LPC bus is used, but the protocol is a little different. In these cases, the CONFIG_CROS_EC_LPC_MEC kernel config is enabled. Currently, the kernel decides at compile-time whether or not to use the MEC variant, and, when that kernel option is selected it breaks the other boards. We would like a kind of runtime detection to avoid this. This patch adds that detection mechanism by probing the protocol at runtime, first we assume that a MEC variant is connected, and if the protocol fails it fallbacks to the regular EC. This adds a bit of overload because we try to read twice on those LPC boards that doesn't contain a MEC variant, but is a better solution than having to select the EC variant at compile-time. While here also fix the alignment in Kconfig file for this config option replacing the spaces by tabs. Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Reviewed-by: Ezequiel Garcia <ezequiel@collabora.com> Tested-by: Nick Crews <ncrews@chromium.org> Reviewed-by: Nick Crews <ncrews@chromium.org>
37 lines
1.3 KiB
Plaintext
37 lines
1.3 KiB
Plaintext
config WILCO_EC
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tristate "ChromeOS Wilco Embedded Controller"
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depends on ACPI && X86 && CROS_EC_LPC
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help
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If you say Y here, you get support for talking to the ChromeOS
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Wilco EC over an eSPI bus. This uses a simple byte-level protocol
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with a checksum.
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To compile this driver as a module, choose M here: the
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module will be called wilco_ec.
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config WILCO_EC_DEBUGFS
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tristate "Enable raw access to EC via debugfs"
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depends on WILCO_EC
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help
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If you say Y here, you get support for sending raw commands to
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the Wilco EC via debugfs. These commands do not do any byte
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manipulation and allow for testing arbitrary commands. This
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interface is intended for debug only and will not be present
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on production devices.
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config WILCO_EC_EVENTS
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tristate "Enable event forwarding from EC to userspace"
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depends on WILCO_EC
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help
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If you say Y here, you get support for the EC to send events
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(such as power state changes) to userspace. The EC sends the events
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over ACPI, and a driver queues up the events to be read by a
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userspace daemon from /dev/wilco_event using read() and poll().
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config WILCO_EC_TELEMETRY
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tristate "Enable querying telemetry data from EC"
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depends on WILCO_EC
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help
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If you say Y here, you get support to query EC telemetry data from
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/dev/wilco_telem0 using write() and then read().
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