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Add detailed comments about EC_MEMMAP area to ec_commands.h

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This clarifies the use of the EC's memory-mapped interface to the AP. We
always end up reverse-engineering this, so I'm just documenting what bytes
are actually used.

BUG=none
BRANCH=ToT
TEST=make buildall

No code changes, only comments.

Change-Id: Icfaa794626d2f656ab5d8a8d067b3e2663cc8882
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/193052
Reviewed-by: Randall Spangler <rspangler@chromium.org>
This commit is contained in:
Bill Richardson
2014-04-03 10:11:57 -07:00
committed by chrome-internal-fetch
parent 6d8276c431
commit 34651bcb93
1 changed files with 20 additions and 10 deletions
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30
include/ec_commands.h
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@@ -57,18 +57,22 @@
#define EC_MEMMAP_TEXT_MAX 8 /* Size of a string in the memory map */
/* The offset address of each type of data in mapped memory. */
#define EC_MEMMAP_TEMP_SENSOR 0x00 /* Temp sensors */
#define EC_MEMMAP_FAN 0x10 /* Fan speeds */
#define EC_MEMMAP_TEMP_SENSOR_B 0x18 /* Temp sensors (second set) */
#define EC_MEMMAP_ID 0x20 /* 'E' 'C' */
#define EC_MEMMAP_TEMP_SENSOR 0x00 /* Temp sensors 0x00 - 0x0f */
#define EC_MEMMAP_FAN 0x10 /* Fan speeds 0x10 - 0x17 */
#define EC_MEMMAP_TEMP_SENSOR_B 0x18 /* More temp sensors 0x18 - 0x1f */
#define EC_MEMMAP_ID 0x20 /* 0x20 == 'E', 0x21 == 'C' */
#define EC_MEMMAP_ID_VERSION 0x22 /* Version of data in 0x20 - 0x2f */
#define EC_MEMMAP_THERMAL_VERSION 0x23 /* Version of data in 0x00 - 0x1f */
#define EC_MEMMAP_BATTERY_VERSION 0x24 /* Version of data in 0x40 - 0x7f */
#define EC_MEMMAP_SWITCHES_VERSION 0x25 /* Version of data in 0x30 - 0x33 */
#define EC_MEMMAP_EVENTS_VERSION 0x26 /* Version of data in 0x34 - 0x3f */
#define EC_MEMMAP_HOST_CMD_FLAGS 0x27 /* Host command interface flags */
#define EC_MEMMAP_SWITCHES 0x30
#define EC_MEMMAP_HOST_EVENTS 0x34
#define EC_MEMMAP_HOST_CMD_FLAGS 0x27 /* Host cmd interface flags (8 bits) */
/* Unused 0x28 - 0x2f */
#define EC_MEMMAP_SWITCHES 0x30 /* 8 bits */
/* Unused 0x31 - 0x33 */
#define EC_MEMMAP_HOST_EVENTS 0x34 /* 32 bits */
/* Reserve 0x38 - 0x3f for additional host event-related stuff */
/* Battery values are all 32 bits */
#define EC_MEMMAP_BATT_VOLT 0x40 /* Battery Present Voltage */
#define EC_MEMMAP_BATT_RATE 0x44 /* Battery Present Rate */
#define EC_MEMMAP_BATT_CAP 0x48 /* Battery Remaining Capacity */
@@ -77,13 +81,19 @@
#define EC_MEMMAP_BATT_DVLT 0x54 /* Battery Design Voltage */
#define EC_MEMMAP_BATT_LFCC 0x58 /* Battery Last Full Charge Capacity */
#define EC_MEMMAP_BATT_CCNT 0x5c /* Battery Cycle Count */
/* Strings are all 8 bytes (EC_MEMMAP_TEXT_MAX) */
#define EC_MEMMAP_BATT_MFGR 0x60 /* Battery Manufacturer String */
#define EC_MEMMAP_BATT_MODEL 0x68 /* Battery Model Number String */
#define EC_MEMMAP_BATT_SERIAL 0x70 /* Battery Serial Number String */
#define EC_MEMMAP_BATT_TYPE 0x78 /* Battery Type String */
#define EC_MEMMAP_ALS 0x80 /* ALS readings in lux (uint16_t) */
#define EC_MEMMAP_ACC_STATUS 0x90 /* Accelerometer status */
#define EC_MEMMAP_ACC_DATA 0x92 /* Accelerometer data 0x92 - 0xa5 */
#define EC_MEMMAP_ALS 0x80 /* ALS readings in lux (2 X 16 bits) */
/* Unused 0x84 - 0x8f */
#define EC_MEMMAP_ACC_STATUS 0x90 /* Accelerometer status (8 bits )*/
/* Unused 0x91 */
#define EC_MEMMAP_ACC_DATA 0x92 /* Accelerometer data 0x92 - 0x9f */
#define EC_MEMMAP_GYRO_DATA 0xa0 /* Gyroscope data 0xa0 - 0xa5 */
/* Unused 0xa6 - 0xfe (remember, 0xff is NOT part of the memmap region) */
/* Define the format of the accelerometer mapped memory status byte. */
#define EC_MEMMAP_ACC_STATUS_SAMPLE_ID_MASK 0x0f