diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/debugfs-wilco-ec | 45 |
1 files changed, 34 insertions, 11 deletions
diff --git a/Documentation/ABI/testing/debugfs-wilco-ec b/Documentation/ABI/testing/debugfs-wilco-ec index f814f112e213..73a5a66ddca6 100644 --- a/Documentation/ABI/testing/debugfs-wilco-ec +++ b/Documentation/ABI/testing/debugfs-wilco-ec @@ -1,23 +1,46 @@ +What: /sys/kernel/debug/wilco_ec/h1_gpio +Date: April 2019 +KernelVersion: 5.2 +Description: + As part of Chrome OS's FAFT (Fully Automated Firmware Testing) + tests, we need to ensure that the H1 chip is properly setting + some GPIO lines. The h1_gpio attribute exposes the state + of the lines: + - ENTRY_TO_FACT_MODE in BIT(0) + - SPI_CHROME_SEL in BIT(1) + + Output will formatted with "0x%02x\n". + What: /sys/kernel/debug/wilco_ec/raw Date: January 2019 KernelVersion: 5.1 Description: Write and read raw mailbox commands to the EC. - For writing: - Bytes 0-1 indicate the message type: - 00 F0 = Execute Legacy Command - 00 F2 = Read/Write NVRAM Property - Byte 2 provides the command code - Bytes 3+ consist of the data passed in the request + You can write a hexadecimal sentence to raw, and that series of + bytes will be sent to the EC. Then, you can read the bytes of + response by reading from raw. - At least three bytes are required, for the msg type and command, - with additional bytes optional for additional data. + For writing, bytes 0-1 indicate the message type, one of enum + wilco_ec_msg_type. Byte 2+ consist of the data passed in the + request, starting at MBOX[0] + + At least three bytes are required for writing, two for the type + and at least a single byte of data. Only the first + EC_MAILBOX_DATA_SIZE bytes of MBOX will be used. Example: // Request EC info type 3 (EC firmware build date) - $ echo 00 f0 38 00 03 00 > raw + // Corresponds with sending type 0x00f0 with + // MBOX = [38, 00, 03, 00] + $ echo 00 f0 38 00 03 00 > /sys/kernel/debug/wilco_ec/raw // View the result. The decoded ASCII result "12/21/18" is // included after the raw hex. - $ cat raw - 00 31 32 2f 32 31 2f 31 38 00 38 00 01 00 2f 00 .12/21/18.8... + // Corresponds with MBOX = [00, 00, 31, 32, 2f, 32, 31, 38, ...] + $ cat /sys/kernel/debug/wilco_ec/raw + 00 00 31 32 2f 32 31 2f 31 38 00 38 00 01 00 2f 00 ..12/21/18.8... + + Note that the first 32 bytes of the received MBOX[] will be + printed, even if some of the data is junk. It is up to you to + know how many of the first bytes of data are the actual + response. |