[PATCH v3 16/30] mfd: cros_ec: Fix event processing API

Gwendal Grignou
2019-05-09T21:16:02Z

Improve API between EC and Host to report events.

Acked-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
---
include/linux/mfd/cros_ec_commands.h | 87 ++++++++++++++++++++++++----
1 file changed, 76 insertions(+), 11 deletions(-)

diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
index 701b03cfa445..51fe65170ce6 100644
--- a/include/linux/mfd/cros_ec_commands.h
+++ b/include/linux/mfd/cros_ec_commands.h
@@ -500,7 +500,8 @@ enum host_event_code {
EC_HOST_EVENT_BATTERY_CRITICAL = 7,
EC_HOST_EVENT_BATTERY = 8,
EC_HOST_EVENT_THERMAL_THRESHOLD = 9,
- EC_HOST_EVENT_THERMAL_OVERLOAD = 10,
+ /* Event generated by a device attached to the EC */
+ EC_HOST_EVENT_DEVICE = 10,
EC_HOST_EVENT_THERMAL = 11,
EC_HOST_EVENT_USB_CHARGER = 12,
EC_HOST_EVENT_KEY_PRESSED = 13,
@@ -527,15 +528,34 @@ enum host_event_code {
EC_HOST_EVENT_HANG_DETECT = 20,
/* Hang detect logic detected a hang and warm rebooted the AP */
EC_HOST_EVENT_HANG_REBOOT = 21,
+
/* PD MCU triggering host event */
EC_HOST_EVENT_PD_MCU = 22,

- /* EC desires to change state of host-controlled USB mux */
- EC_HOST_EVENT_USB_MUX = 28,
+ /* Battery Status flags have changed */
+ EC_HOST_EVENT_BATTERY_STATUS = 23,
+
+ /* EC encountered a panic, triggering a reset */
+ EC_HOST_EVENT_PANIC = 24,
+
+ /* Keyboard fastboot combo has been pressed */
+ EC_HOST_EVENT_KEYBOARD_FASTBOOT = 25,

/* EC RTC event occurred */
EC_HOST_EVENT_RTC = 26,

+ /* Emulate MKBP event */
+ EC_HOST_EVENT_MKBP = 27,
+
+ /* EC desires to change state of host-controlled USB mux */
+ EC_HOST_EVENT_USB_MUX = 28,
+
+ /* TABLET/LAPTOP mode or detachable base attach/detach event */
+ EC_HOST_EVENT_MODE_CHANGE = 29,
+
+ /* Keyboard recovery combo with hardware reinitialization */
+ EC_HOST_EVENT_KEYBOARD_RECOVERY_HW_REINIT = 30,
+
/*
* The high bit of the event mask is not used as a host event code. If
* it reads back as set, then the entire event mask should be
@@ -1259,7 +1279,7 @@ enum ec_feature_code {
EC_FEATURE_REFINED_TABLET_MODE_HYSTERESIS = 37,
/* EC supports audio codec. */
EC_FEATURE_AUDIO_CODEC = 38,
- /* EC Supports SCP. */
+ /* The MCU is a System Companion Processor (SCP). */
EC_FEATURE_SCP = 39,
/* The MCU is an Integrated Sensor Hub */
EC_FEATURE_ISH = 40,
@@ -3183,12 +3203,23 @@ struct ec_result_keyscan_seq_ctrl {
} __ec_todo_packed;

/*
- * Command for retrieving the next pending MKBP event from the EC device
+ * Get the next pending MKBP event.
*
- * The device replies with UNAVAILABLE if there aren't any pending events.
+ * Returns EC_RES_UNAVAILABLE if there is no event pending.
*/
#define EC_CMD_GET_NEXT_EVENT 0x0067

+#define EC_MKBP_HAS_MORE_EVENTS_SHIFT 7
+
+/*
+ * We use the most significant bit of the event type to indicate to the host
+ * that the EC has more MKBP events available to provide.
+ */
+#define EC_MKBP_HAS_MORE_EVENTS BIT(EC_MKBP_HAS_MORE_EVENTS_SHIFT)
+
+/* The mask to apply to get the raw event type */
+#define EC_MKBP_EVENT_TYPE_MASK (BIT(EC_MKBP_HAS_MORE_EVENTS_SHIFT) - 1)
+
enum ec_mkbp_event {
/* Keyboard matrix changed. The event data is the new matrix state. */
EC_MKBP_EVENT_KEY_MATRIX = 0,
@@ -3205,9 +3236,21 @@ enum ec_mkbp_event {
/* The state of the switches have changed. */
EC_MKBP_EVENT_SWITCH = 4,

- /* EC sent a sysrq command */
+ /* New Fingerprint sensor event, the event data is fp_events bitmap. */
+ EC_MKBP_EVENT_FINGERPRINT = 5,
+
+ /*
+ * Sysrq event: send emulated sysrq. The event data is sysrq,
+ * corresponding to the key to be pressed.
+ */
EC_MKBP_EVENT_SYSRQ = 6,

+ /*
+ * New 64-bit host event.
+ * The event data is 8 bytes of host event flags.
+ */
+ EC_MKBP_EVENT_HOST_EVENT64 = 7,
+
/* Notify the AP that something happened on CEC */
EC_MKBP_EVENT_CEC_EVENT = 8,

@@ -3217,12 +3260,14 @@ enum ec_mkbp_event {
/* Number of MKBP events */
EC_MKBP_EVENT_COUNT,
};
+BUILD_ASSERT(EC_MKBP_EVENT_COUNT <= EC_MKBP_EVENT_TYPE_MASK);

union __ec_align_offset1 ec_response_get_next_data {
uint8_t key_matrix[13];

/* Unaligned */
- uint32_t host_event;
+ uint32_t host_event;
+ uint64_t host_event64;

struct __ec_todo_unpacked {
/* For aligning the fifo_info */
@@ -3230,14 +3275,25 @@ union __ec_align_offset1 ec_response_get_next_data {
struct ec_response_motion_sense_fifo_info info;
} sensor_fifo;

- uint32_t buttons;
- uint32_t switches;
- uint32_t sysrq;
+ uint32_t buttons;
+
+ uint32_t switches;
+
+ uint32_t fp_events;
+
+ uint32_t sysrq;
+
+ /* CEC events from enum mkbp_cec_event */
+ uint32_t cec_events;
};

union __ec_align_offset1 ec_response_get_next_data_v1 {
uint8_t key_matrix[16];
+
+ /* Unaligned */
uint32_t host_event;
+ uint64_t host_event64;
+
struct __ec_todo_unpacked {
/* For aligning the fifo_info */
uint8_t reserved[3];
@@ -3245,11 +3301,19 @@ union __ec_align_offset1 ec_response_get_next_data_v1 {
} sensor_fifo;

uint32_t buttons;
+
uint32_t switches;
+
+ uint32_t fp_events;
+
uint32_t sysrq;
+
+ /* CEC events from enum mkbp_cec_event */
uint32_t cec_events;
+
uint8_t cec_message[16];
};
+BUILD_ASSERT(sizeof(union ec_response_get_next_data_v1) == 16);

struct ec_response_get_next_event {
uint8_t event_type;
@@ -3268,6 +3332,7 @@ struct ec_response_get_next_event_v1 {
#define EC_MKBP_POWER_BUTTON 0
#define EC_MKBP_VOL_UP 1
#define EC_MKBP_VOL_DOWN 2
+#define EC_MKBP_RECOVERY 3

/* Switches */
#define EC_MKBP_LID_OPEN 0
--
2.21.0.1020.gf2820cf01a-goog