cros_ec.c

	int node = dev_of_offset(dev);
	char id[MSG_BYTES];

	cdev->dev = dev;
	gpio_request_by_name(dev, "ec-interrupt", 0, &cdev->ec_int,
			     GPIOD_IS_IN);
	cdev->optimise_flash_write = fdtdec_get_bool(blob, node,
						     "optimise-flash-write");

	if (cros_ec_check_version(cdev)) {
		debug("%s: Could not detect CROS-EC version\n", __func__);
		return -CROS_EC_ERR_CHECK_VERSION;
	}

	if (cros_ec_read_id(cdev, id, sizeof(id))) {
		debug("%s: Could not read KBC ID\n", __func__);
		return -CROS_EC_ERR_READ_ID;
	}

	/* Remember this device for use by the cros_ec command */
	debug("Google Chrome EC v%d CROS-EC driver ready, id '%s'\n",
	      cdev->protocol_version, id);

	return 0;
}

int cros_ec_decode_ec_flash(const void *blob, int node,
			    struct fdt_cros_ec *config)
{
	int flash_node;

	flash_node = fdt_subnode_offset(blob, node, "flash");
	if (flash_node < 0) {
		debug("Failed to find flash node\n");
		return -1;
	}

	if (fdtdec_read_fmap_entry(blob, flash_node, "flash",
				   &config->flash)) {
		debug("Failed to decode flash node in chrome-ec'\n");
		return -1;
	}

	config->flash_erase_value = fdtdec_get_int(blob, flash_node,
						    "erase-value", -1);
	for (node = fdt_first_subnode(blob, flash_node); node >= 0;
	     node = fdt_next_subnode(blob, node)) {
		const char *name = fdt_get_name(blob, node, NULL);
		enum ec_flash_region region;

		if (0 == strcmp(name, "ro")) {
			region = EC_FLASH_REGION_RO;
		} else if (0 == strcmp(name, "rw")) {
			region = EC_FLASH_REGION_RW;
		} else if (0 == strcmp(name, "wp-ro")) {
			region = EC_FLASH_REGION_WP_RO;
		} else {
			debug("Unknown EC flash region name '%s'\n", name);
			return -1;
		}

		if (fdtdec_read_fmap_entry(blob, node, "reg",
					   &config->region[region])) {
			debug("Failed to decode flash region in chrome-ec'\n");
			return -1;
		}
	}

	return 0;
}

int cros_ec_i2c_tunnel(struct udevice *dev, int port, struct i2c_msg *in,
		       int nmsgs)
{
	struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
	union {
		struct ec_params_i2c_passthru p;
		uint8_t outbuf[EC_PROTO2_MAX_PARAM_SIZE];
	} params;
	union {
		struct ec_response_i2c_passthru r;
		uint8_t inbuf[EC_PROTO2_MAX_PARAM_SIZE];
	} response;
	struct ec_params_i2c_passthru *p = &params.p;
	struct ec_response_i2c_passthru *r = &response.r;
	struct ec_params_i2c_passthru_msg *msg;
	uint8_t *pdata, *read_ptr = NULL;
	int read_len;
	int size;
	int rv;
	int i;

	p->port = port;

	p->num_msgs = nmsgs;
	size = sizeof(*p) + p->num_msgs * sizeof(*msg);

	/* Create a message to write the register address and optional data */
	pdata = (uint8_t *)p + size;

	read_len = 0;
	for (i = 0, msg = p->msg; i < nmsgs; i++, msg++, in++) {
		bool is_read = in->flags & I2C_M_RD;

		msg->addr_flags = in->addr;
		msg->len = in->len;
		if (is_read) {
			msg->addr_flags |= EC_I2C_FLAG_READ;
			read_len += in->len;
			read_ptr = in->buf;
			if (sizeof(*r) + read_len > sizeof(response)) {
				puts("Read length too big for buffer\n");
				return -1;
			}
		} else {
			if (pdata - (uint8_t *)p + in->len > sizeof(params)) {
				puts("Params too large for buffer\n");
				return -1;
			}
			memcpy(pdata, in->buf, in->len);
			pdata += in->len;
		}
	}

	rv = ec_command(cdev, EC_CMD_I2C_PASSTHRU, 0, p, pdata - (uint8_t *)p,
			r, sizeof(*r) + read_len);
	if (rv < 0)
		return rv;

	/* Parse response */
	if (r->i2c_status & EC_I2C_STATUS_ERROR) {
		printf("Transfer failed with status=0x%x\n", r->i2c_status);
		return -1;
	}

	if (rv < sizeof(*r) + read_len) {
		puts("Truncated read response\n");
		return -1;
	}

	/* We only support a single read message for each transfer */
	if (read_len)
		memcpy(read_ptr, r->data, read_len);

	return 0;
}

UCLASS_DRIVER(cros_ec) = {
	.id		= UCLASS_CROS_EC,
	.name		= "cros_ec",
	.per_device_auto_alloc_size = sizeof(struct cros_ec_dev),
	.post_bind	= dm_scan_fdt_dev,
};