25 static int prepare_packet(struct cros_ec_device *ec_dev,  in prepare_packet()  argument
33 	BUG_ON(ec_dev->proto_version != EC_HOST_REQUEST_VERSION);  in prepare_packet()
34 	BUG_ON(msg->outsize + sizeof(*request) > ec_dev->dout_size);  in prepare_packet()
36 	out = ec_dev->dout;  in prepare_packet()
58 static int send_command(struct cros_ec_device *ec_dev,  in send_command()  argument
63 	if (ec_dev->proto_version > 2)  in send_command()
64 		ret = ec_dev->pkt_xfer(ec_dev, msg);  in send_command()
66 		ret = ec_dev->cmd_xfer(ec_dev, msg);  in send_command()
90 			ret = ec_dev->cmd_xfer(ec_dev, status_msg);  in send_command()
110 int cros_ec_prepare_tx(struct cros_ec_device *ec_dev,  in cros_ec_prepare_tx()  argument
117 	if (ec_dev->proto_version > 2)  in cros_ec_prepare_tx()
118 		return prepare_packet(ec_dev, msg);  in cros_ec_prepare_tx()
121 	out = ec_dev->dout;  in cros_ec_prepare_tx()
134 int cros_ec_check_result(struct cros_ec_device *ec_dev,  in cros_ec_check_result()  argument
141 		dev_dbg(ec_dev->dev, "command 0x%02x in progress\n",  in cros_ec_check_result()
145 		dev_dbg(ec_dev->dev, "command 0x%02x returned %d\n",  in cros_ec_check_result()
152 static int cros_ec_host_command_proto_query(struct cros_ec_device *ec_dev,  in cros_ec_host_command_proto_query()  argument
164 	if (!ec_dev->pkt_xfer)  in cros_ec_host_command_proto_query()
171 	ret = send_command(ec_dev, msg);  in cros_ec_host_command_proto_query()
174 		dev_dbg(ec_dev->dev,  in cros_ec_host_command_proto_query()
188 static int cros_ec_host_command_proto_query_v2(struct cros_ec_device *ec_dev)  in cros_ec_host_command_proto_query_v2()  argument
209 	ret = send_command(ec_dev, msg);  in cros_ec_host_command_proto_query_v2()
212 		dev_dbg(ec_dev->dev,  in cros_ec_host_command_proto_query_v2()
217 		dev_err(ec_dev->dev,  in cros_ec_host_command_proto_query_v2()
223 		dev_err(ec_dev->dev,  in cros_ec_host_command_proto_query_v2()
237 int cros_ec_query_all(struct cros_ec_device *ec_dev)  in cros_ec_query_all()  argument
239 	struct device *dev = ec_dev->dev;  in cros_ec_query_all()
250 	ec_dev->proto_version = 3;  in cros_ec_query_all()
251 	ret = cros_ec_host_command_proto_query(ec_dev, 0, proto_msg);  in cros_ec_query_all()
256 		ec_dev->max_request = proto_info->max_request_packet_size -  in cros_ec_query_all()
258 		ec_dev->max_response = proto_info->max_response_packet_size -  in cros_ec_query_all()
260 		ec_dev->proto_version =  in cros_ec_query_all()
263 		dev_dbg(ec_dev->dev,  in cros_ec_query_all()
265 			ec_dev->proto_version);  in cros_ec_query_all()
267 		ec_dev->din_size = ec_dev->max_response +  in cros_ec_query_all()
270 		ec_dev->dout_size = ec_dev->max_request +  in cros_ec_query_all()
277 		ret = cros_ec_host_command_proto_query(ec_dev, 1, proto_msg);  in cros_ec_query_all()
280 			dev_dbg(ec_dev->dev, "no PD chip found: %d\n", ret);  in cros_ec_query_all()
281 			ec_dev->max_passthru = 0;  in cros_ec_query_all()
283 			dev_dbg(ec_dev->dev, "found PD chip\n");  in cros_ec_query_all()
284 			ec_dev->max_passthru =  in cros_ec_query_all()
290 		ec_dev->proto_version = 2;  in cros_ec_query_all()
291 		ret = cros_ec_host_command_proto_query_v2(ec_dev);  in cros_ec_query_all()
295 			dev_dbg(ec_dev->dev, "falling back to proto v2\n");  in cros_ec_query_all()
297 			ec_dev->max_request = EC_PROTO2_MAX_PARAM_SIZE;  in cros_ec_query_all()
298 			ec_dev->max_response = EC_PROTO2_MAX_PARAM_SIZE;  in cros_ec_query_all()
299 			ec_dev->max_passthru = 0;  in cros_ec_query_all()
300 			ec_dev->pkt_xfer = NULL;  in cros_ec_query_all()
301 			ec_dev->din_size = EC_MSG_BYTES;  in cros_ec_query_all()
302 			ec_dev->dout_size = EC_MSG_BYTES;  in cros_ec_query_all()
309 			ec_dev->proto_version = EC_PROTO_VERSION_UNKNOWN;  in cros_ec_query_all()
310 			dev_dbg(ec_dev->dev, "EC query failed: %d\n", ret);  in cros_ec_query_all()
315 	devm_kfree(dev, ec_dev->din);  in cros_ec_query_all()
316 	devm_kfree(dev, ec_dev->dout);  in cros_ec_query_all()
318 	ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL);  in cros_ec_query_all()
319 	if (!ec_dev->din) {  in cros_ec_query_all()
324 	ec_dev->dout = devm_kzalloc(dev, ec_dev->dout_size, GFP_KERNEL);  in cros_ec_query_all()
325 	if (!ec_dev->dout) {  in cros_ec_query_all()
326 		devm_kfree(dev, ec_dev->din);  in cros_ec_query_all()
337 int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,  in cros_ec_cmd_xfer()  argument
342 	mutex_lock(&ec_dev->lock);  in cros_ec_cmd_xfer()
343 	if (ec_dev->proto_version == EC_PROTO_VERSION_UNKNOWN) {  in cros_ec_cmd_xfer()
344 		ret = cros_ec_query_all(ec_dev);  in cros_ec_cmd_xfer()
346 			dev_err(ec_dev->dev,  in cros_ec_cmd_xfer()
348 			mutex_unlock(&ec_dev->lock);  in cros_ec_cmd_xfer()
353 	if (msg->insize > ec_dev->max_response) {  in cros_ec_cmd_xfer()
354 		dev_dbg(ec_dev->dev, "clamping message receive buffer\n");  in cros_ec_cmd_xfer()
355 		msg->insize = ec_dev->max_response;  in cros_ec_cmd_xfer()
359 		if (msg->outsize > ec_dev->max_request) {  in cros_ec_cmd_xfer()
360 			dev_err(ec_dev->dev,  in cros_ec_cmd_xfer()
363 				ec_dev->max_request);  in cros_ec_cmd_xfer()
364 			mutex_unlock(&ec_dev->lock);  in cros_ec_cmd_xfer()
368 		if (msg->outsize > ec_dev->max_passthru) {  in cros_ec_cmd_xfer()
369 			dev_err(ec_dev->dev,  in cros_ec_cmd_xfer()
372 				ec_dev->max_passthru);  in cros_ec_cmd_xfer()
373 			mutex_unlock(&ec_dev->lock);  in cros_ec_cmd_xfer()
377 	ret = send_command(ec_dev, msg);  in cros_ec_cmd_xfer()
378 	mutex_unlock(&ec_dev->lock);  in cros_ec_cmd_xfer()