1 // SPDX-License-Identifier: GPL-2.0
13 #include <linux/rpmsg.h>
23  * struct cros_ec_rpmsg_response - rpmsg message format from from EC.
36  * struct cros_ec_rpmsg - information about a EC over rpmsg.
38  * @rpdev:	rpmsg device we are connected to
41  * @ept: The rpmsg endpoint of this channel.
55  * cros_ec_cmd_xfer_rpmsg - Transfer a message over rpmsg and receive the reply
63  * Return: -EINVAL
68 	return -EINVAL;  in cros_ec_cmd_xfer_rpmsg()
72  * cros_ec_pkt_xfer_rpmsg - Transfer a packet over rpmsg and receive the reply
82 	struct cros_ec_rpmsg *ec_rpmsg = ec_dev->priv;  in cros_ec_pkt_xfer_rpmsg()
90 	ec_msg->result = 0;  in cros_ec_pkt_xfer_rpmsg()
94 	dev_dbg(ec_dev->dev, "prepared, len=%d\n", len);  in cros_ec_pkt_xfer_rpmsg()
96 	reinit_completion(&ec_rpmsg->xfer_ack);  in cros_ec_pkt_xfer_rpmsg()
97 	ret = rpmsg_send(ec_rpmsg->ept, ec_dev->dout, len);  in cros_ec_pkt_xfer_rpmsg()
99 		dev_err(ec_dev->dev, "rpmsg send failed\n");  in cros_ec_pkt_xfer_rpmsg()
104 	ret = wait_for_completion_timeout(&ec_rpmsg->xfer_ack, timeout);  in cros_ec_pkt_xfer_rpmsg()
106 		dev_err(ec_dev->dev, "rpmsg send timeout\n");  in cros_ec_pkt_xfer_rpmsg()
107 		return -EIO;  in cros_ec_pkt_xfer_rpmsg()
111 	response = (struct ec_host_response *)ec_dev->din;  in cros_ec_pkt_xfer_rpmsg()
112 	ec_msg->result = response->result;  in cros_ec_pkt_xfer_rpmsg()
118 	if (response->data_len > ec_msg->insize) {  in cros_ec_pkt_xfer_rpmsg()
119 		dev_err(ec_dev->dev, "packet too long (%d bytes, expected %d)",  in cros_ec_pkt_xfer_rpmsg()
120 			response->data_len, ec_msg->insize);  in cros_ec_pkt_xfer_rpmsg()
121 		ret = -EMSGSIZE;  in cros_ec_pkt_xfer_rpmsg()
126 	memcpy(ec_msg->data, ec_dev->din + sizeof(*response),  in cros_ec_pkt_xfer_rpmsg()
127 	       response->data_len);  in cros_ec_pkt_xfer_rpmsg()
130 	for (i = 0; i < sizeof(*response) + response->data_len; i++)  in cros_ec_pkt_xfer_rpmsg()
131 		sum += ec_dev->din[i];  in cros_ec_pkt_xfer_rpmsg()
134 		dev_err(ec_dev->dev, "bad packet checksum, calculated %x\n",  in cros_ec_pkt_xfer_rpmsg()
136 		ret = -EBADMSG;  in cros_ec_pkt_xfer_rpmsg()
140 	ret = response->data_len;  in cros_ec_pkt_xfer_rpmsg()
142 	if (ec_msg->command == EC_CMD_REBOOT_EC)  in cros_ec_pkt_xfer_rpmsg()
155 	cros_ec_irq_thread(0, dev_get_drvdata(&ec_rpmsg->rpdev->dev));  in cros_ec_rpmsg_host_event_function()
161 	struct cros_ec_device *ec_dev = dev_get_drvdata(&rpdev->dev);  in cros_ec_rpmsg_callback()
162 	struct cros_ec_rpmsg *ec_rpmsg = ec_dev->priv;  in cros_ec_rpmsg_callback()
166 		dev_warn(ec_dev->dev, "rpmsg received empty response");  in cros_ec_rpmsg_callback()
167 		return -EINVAL;  in cros_ec_rpmsg_callback()
171 	len -= offsetof(struct cros_ec_rpmsg_response, data);  in cros_ec_rpmsg_callback()
172 	if (resp->type == HOST_COMMAND_MARK) {  in cros_ec_rpmsg_callback()
173 		if (len > ec_dev->din_size) {  in cros_ec_rpmsg_callback()
174 			dev_warn(ec_dev->dev,  in cros_ec_rpmsg_callback()
176 				 len, ec_dev->din_size);  in cros_ec_rpmsg_callback()
177 			len = ec_dev->din_size;  in cros_ec_rpmsg_callback()
180 		memcpy(ec_dev->din, resp->data, len);  in cros_ec_rpmsg_callback()
181 		complete(&ec_rpmsg->xfer_ack);  in cros_ec_rpmsg_callback()
182 	} else if (resp->type == HOST_EVENT_MARK) {  in cros_ec_rpmsg_callback()
187 		if (ec_rpmsg->probe_done)  in cros_ec_rpmsg_callback()
188 			schedule_work(&ec_rpmsg->host_event_work);  in cros_ec_rpmsg_callback()
190 			ec_rpmsg->has_pending_host_event = true;  in cros_ec_rpmsg_callback()
192 		dev_warn(ec_dev->dev, "rpmsg received invalid type = %d",  in cros_ec_rpmsg_callback()
193 			 resp->type);  in cros_ec_rpmsg_callback()
194 		return -EINVAL;  in cros_ec_rpmsg_callback()
205 	strscpy(chinfo.name, rpdev->id.name, RPMSG_NAME_SIZE);  in cros_ec_rpmsg_create_ept()
206 	chinfo.src = rpdev->src;  in cros_ec_rpmsg_create_ept()
214 	struct device *dev = &rpdev->dev;  in cros_ec_rpmsg_probe()
221 		return -ENOMEM;  in cros_ec_rpmsg_probe()
225 		return -ENOMEM;  in cros_ec_rpmsg_probe()
227 	ec_dev->dev = dev;  in cros_ec_rpmsg_probe()
228 	ec_dev->priv = ec_rpmsg;  in cros_ec_rpmsg_probe()
229 	ec_dev->cmd_xfer = cros_ec_cmd_xfer_rpmsg;  in cros_ec_rpmsg_probe()
230 	ec_dev->pkt_xfer = cros_ec_pkt_xfer_rpmsg;  in cros_ec_rpmsg_probe()
231 	ec_dev->phys_name = dev_name(&rpdev->dev);  in cros_ec_rpmsg_probe()
232 	ec_dev->din_size = sizeof(struct ec_host_response) +  in cros_ec_rpmsg_probe()
234 	ec_dev->dout_size = sizeof(struct ec_host_request);  in cros_ec_rpmsg_probe()
237 	ec_rpmsg->rpdev = rpdev;  in cros_ec_rpmsg_probe()
238 	init_completion(&ec_rpmsg->xfer_ack);  in cros_ec_rpmsg_probe()
239 	INIT_WORK(&ec_rpmsg->host_event_work,  in cros_ec_rpmsg_probe()
242 	ec_rpmsg->ept = cros_ec_rpmsg_create_ept(rpdev);  in cros_ec_rpmsg_probe()
243 	if (!ec_rpmsg->ept)  in cros_ec_rpmsg_probe()
244 		return -ENOMEM;  in cros_ec_rpmsg_probe()
248 		rpmsg_destroy_ept(ec_rpmsg->ept);  in cros_ec_rpmsg_probe()
249 		cancel_work_sync(&ec_rpmsg->host_event_work);  in cros_ec_rpmsg_probe()
253 	ec_rpmsg->probe_done = true;  in cros_ec_rpmsg_probe()
255 	if (ec_rpmsg->has_pending_host_event)  in cros_ec_rpmsg_probe()
256 		schedule_work(&ec_rpmsg->host_event_work);  in cros_ec_rpmsg_probe()
263 	struct cros_ec_device *ec_dev = dev_get_drvdata(&rpdev->dev);  in cros_ec_rpmsg_remove()
264 	struct cros_ec_rpmsg *ec_rpmsg = ec_dev->priv;  in cros_ec_rpmsg_remove()
267 	rpmsg_destroy_ept(ec_rpmsg->ept);  in cros_ec_rpmsg_remove()
268 	cancel_work_sync(&ec_rpmsg->host_event_work);  in cros_ec_rpmsg_remove()
291 	{ .compatible = "google,cros-ec-rpmsg", },
298 		.name   = "cros-ec-rpmsg",
309 MODULE_DESCRIPTION("ChromeOS EC multi function device (rpmsg)");