platform/chrome: Introduce a new function to check EC features. (e4244ebd) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/platform/chrome/cros_ec_dev.c

+37 −0

Original line number	Diff line number	Diff line
		@@ -87,6 +87,41 @@ static int ec_get_version(struct cros_ec_dev ec, char str, int maxlen)
		return ret;
		}

		static int cros_ec_check_features(struct cros_ec_dev *ec, int feature)
		{
		struct cros_ec_command *msg;
		int ret;

		if (ec->features[0] == -1U && ec->features[1] == -1U) {
		/* features bitmap not read yet */

		msg = kmalloc(sizeof(*msg) + sizeof(ec->features), GFP_KERNEL);
		if (!msg)
		return -ENOMEM;

		msg->version = 0;
		msg->command = EC_CMD_GET_FEATURES + ec->cmd_offset;
		msg->insize = sizeof(ec->features);
		msg->outsize = 0;

		ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
		if (ret < 0 \|\| msg->result != EC_RES_SUCCESS) {
		dev_warn(ec->dev, "cannot get EC features: %d/%d\n",
		ret, msg->result);
		memset(ec->features, 0, sizeof(ec->features));
		}

		memcpy(ec->features, msg->data, sizeof(ec->features));

		dev_dbg(ec->dev, "EC features %08x %08x\n",
		ec->features[0], ec->features[1]);

		kfree(msg);
		}

		return ec->features[feature / 32] & EC_FEATURE_MASK_0(feature);
		}

		/* Device file ops */
		static int ec_device_open(struct inode inode, struct file filp)
		{
		@@ -245,6 +280,8 @@ static int ec_device_probe(struct platform_device *pdev)
		ec->ec_dev = dev_get_drvdata(dev->parent);
		ec->dev = dev;
		ec->cmd_offset = ec_platform->cmd_offset;
		ec->features[0] = -1U; /* Not cached yet */
		ec->features[1] = -1U; /* Not cached yet */
		device_initialize(&ec->class_dev);
		cdev_init(&ec->cdev, &fops);

include/linux/mfd/cros_ec.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -184,6 +184,7 @@ struct cros_ec_dev {
		struct cros_ec_device *ec_dev;
		struct device *dev;
		u16 cmd_offset;
		u32 features[2];
		};

		/**

include/linux/mfd/cros_ec_commands.h

+84 −0

Original line number	Diff line number	Diff line
		@@ -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 */