platform/chrome: Introduce a new function to check EC features.

Use the EC_CMD_GET_FEATURES message to check the supported features for
each MCU.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
[tomeu: adapted to changes in mainline]
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
[enric: remove references to USB PD feature and do it more generic]
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
For the MFD changes:
  Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

2 files changed, 85 insertions, 0 deletions

diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
index 1f85b7aff097..f62043a75f43 100644
--- a/include/linux/mfd/cros_ec.h
+++ b/include/linux/mfd/cros_ec.h
@@ -184,6 +184,7 @@ struct cros_ec_dev {
         struct cros_ec_device *ec_dev;
         struct device *dev;
         u16 cmd_offset;
+        u32 features[2];
 };
 
 /**
diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
index 8826e0f64b0e..1683003603f3 100644
--- a/include/linux/mfd/cros_ec_commands.h
+++ b/include/linux/mfd/cros_ec_commands.h
@@ -713,6 +713,90 @@ struct ec_response_get_set_value {
 /* More than one command can use these structs to get/set paramters. */
 #define EC_CMD_GSV_PAUSE_IN_S5  0x0c
 
+/*****************************************************************************/
+/* List the features supported by the firmware */
+#define EC_CMD_GET_FEATURES  0x0d
+
+/* Supported features */
+enum ec_feature_code {
+        /*
+         * This image contains a limited set of features. Another image
+         * in RW partition may support more features.
+         */
+        EC_FEATURE_LIMITED = 0,
+        /*
+         * Commands for probing/reading/writing/erasing the flash in the
+         * EC are present.
+         */
+        EC_FEATURE_FLASH = 1,
+        /*
+         * Can control the fan speed directly.
+         */
+        EC_FEATURE_PWM_FAN = 2,
+        /*
+         * Can control the intensity of the keyboard backlight.
+         */
+        EC_FEATURE_PWM_KEYB = 3,
+        /*
+         * Support Google lightbar, introduced on Pixel.
+         */
+        EC_FEATURE_LIGHTBAR = 4,
+        /* Control of LEDs  */
+        EC_FEATURE_LED = 5,
+        /* Exposes an interface to control gyro and sensors.
+         * The host goes through the EC to access these sensors.
+         * In addition, the EC may provide composite sensors, like lid angle.
+         */
+        EC_FEATURE_MOTION_SENSE = 6,
+        /* The keyboard is controlled by the EC */
+        EC_FEATURE_KEYB = 7,
+        /* The AP can use part of the EC flash as persistent storage. */
+        EC_FEATURE_PSTORE = 8,
+        /* The EC monitors BIOS port 80h, and can return POST codes. */
+        EC_FEATURE_PORT80 = 9,
+        /*
+         * Thermal management: include TMP specific commands.
+         * Higher level than direct fan control.
+         */
+        EC_FEATURE_THERMAL = 10,
+        /* Can switch the screen backlight on/off */
+        EC_FEATURE_BKLIGHT_SWITCH = 11,
+        /* Can switch the wifi module on/off */
+        EC_FEATURE_WIFI_SWITCH = 12,
+        /* Monitor host events, through for example SMI or SCI */
+        EC_FEATURE_HOST_EVENTS = 13,
+        /* The EC exposes GPIO commands to control/monitor connected devices. */
+        EC_FEATURE_GPIO = 14,
+        /* The EC can send i2c messages to downstream devices. */
+        EC_FEATURE_I2C = 15,
+        /* Command to control charger are included */
+        EC_FEATURE_CHARGER = 16,
+        /* Simple battery support. */
+        EC_FEATURE_BATTERY = 17,
+        /*
+         * Support Smart battery protocol
+         * (Common Smart Battery System Interface Specification)
+         */
+        EC_FEATURE_SMART_BATTERY = 18,
+        /* EC can dectect when the host hangs. */
+        EC_FEATURE_HANG_DETECT = 19,
+        /* Report power information, for pit only */
+        EC_FEATURE_PMU = 20,
+        /* Another Cros EC device is present downstream of this one */
+        EC_FEATURE_SUB_MCU = 21,
+        /* Support USB Power delivery (PD) commands */
+        EC_FEATURE_USB_PD = 22,
+        /* Control USB multiplexer, for audio through USB port for instance. */
+        EC_FEATURE_USB_MUX = 23,
+        /* Motion Sensor code has an internal software FIFO */
+        EC_FEATURE_MOTION_SENSE_FIFO = 24,
+};
+
+#define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32))
+#define EC_FEATURE_MASK_1(event_code) (1UL << (event_code - 32))
+struct ec_response_get_features {
+        uint32_t flags[2];
+} __packed;
 
 /*****************************************************************************/
 /* Flash commands */