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307 lines
7.7 KiB
307 lines
7.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// |
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// Copyright 2018 Google LLC. |
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#include <linux/completion.h> |
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#include <linux/delay.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/platform_data/cros_ec_commands.h> |
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#include <linux/platform_data/cros_ec_proto.h> |
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#include <linux/platform_device.h> |
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#include <linux/rpmsg.h> |
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#include <linux/slab.h> |
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#include "cros_ec.h" |
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#define EC_MSG_TIMEOUT_MS 200 |
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#define HOST_COMMAND_MARK 1 |
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#define HOST_EVENT_MARK 2 |
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/** |
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* struct cros_ec_rpmsg_response - rpmsg message format from from EC. |
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* |
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* @type: The type of message, should be either HOST_COMMAND_MARK or |
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* HOST_EVENT_MARK, representing that the message is a response to |
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* host command, or a host event. |
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* @data: ec_host_response for host command. |
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*/ |
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struct cros_ec_rpmsg_response { |
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u8 type; |
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u8 data[] __aligned(4); |
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}; |
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/** |
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* struct cros_ec_rpmsg - information about a EC over rpmsg. |
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* |
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* @rpdev: rpmsg device we are connected to |
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* @xfer_ack: completion for host command transfer. |
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* @host_event_work: Work struct for pending host event. |
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* @ept: The rpmsg endpoint of this channel. |
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* @has_pending_host_event: Boolean used to check if there is a pending event. |
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* @probe_done: Flag to indicate that probe is done. |
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*/ |
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struct cros_ec_rpmsg { |
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struct rpmsg_device *rpdev; |
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struct completion xfer_ack; |
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struct work_struct host_event_work; |
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struct rpmsg_endpoint *ept; |
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bool has_pending_host_event; |
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bool probe_done; |
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}; |
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/** |
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* cros_ec_cmd_xfer_rpmsg - Transfer a message over rpmsg and receive the reply |
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* |
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* @ec_dev: ChromeOS EC device |
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* @ec_msg: Message to transfer |
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* |
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* This is only used for old EC proto version, and is not supported for this |
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* driver. |
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* |
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* Return: -EINVAL |
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*/ |
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static int cros_ec_cmd_xfer_rpmsg(struct cros_ec_device *ec_dev, |
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struct cros_ec_command *ec_msg) |
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{ |
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return -EINVAL; |
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} |
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/** |
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* cros_ec_pkt_xfer_rpmsg - Transfer a packet over rpmsg and receive the reply |
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* |
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* @ec_dev: ChromeOS EC device |
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* @ec_msg: Message to transfer |
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* |
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* Return: number of bytes of the reply on success or negative error code. |
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*/ |
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static int cros_ec_pkt_xfer_rpmsg(struct cros_ec_device *ec_dev, |
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struct cros_ec_command *ec_msg) |
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{ |
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struct cros_ec_rpmsg *ec_rpmsg = ec_dev->priv; |
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struct ec_host_response *response; |
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unsigned long timeout; |
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int len; |
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int ret; |
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u8 sum; |
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int i; |
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ec_msg->result = 0; |
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len = cros_ec_prepare_tx(ec_dev, ec_msg); |
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dev_dbg(ec_dev->dev, "prepared, len=%d\n", len); |
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reinit_completion(&ec_rpmsg->xfer_ack); |
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ret = rpmsg_send(ec_rpmsg->ept, ec_dev->dout, len); |
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if (ret) { |
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dev_err(ec_dev->dev, "rpmsg send failed\n"); |
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return ret; |
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} |
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timeout = msecs_to_jiffies(EC_MSG_TIMEOUT_MS); |
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ret = wait_for_completion_timeout(&ec_rpmsg->xfer_ack, timeout); |
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if (!ret) { |
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dev_err(ec_dev->dev, "rpmsg send timeout\n"); |
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return -EIO; |
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} |
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/* check response error code */ |
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response = (struct ec_host_response *)ec_dev->din; |
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ec_msg->result = response->result; |
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ret = cros_ec_check_result(ec_dev, ec_msg); |
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if (ret) |
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goto exit; |
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if (response->data_len > ec_msg->insize) { |
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dev_err(ec_dev->dev, "packet too long (%d bytes, expected %d)", |
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response->data_len, ec_msg->insize); |
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ret = -EMSGSIZE; |
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goto exit; |
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} |
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/* copy response packet payload and compute checksum */ |
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memcpy(ec_msg->data, ec_dev->din + sizeof(*response), |
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response->data_len); |
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sum = 0; |
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for (i = 0; i < sizeof(*response) + response->data_len; i++) |
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sum += ec_dev->din[i]; |
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if (sum) { |
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dev_err(ec_dev->dev, "bad packet checksum, calculated %x\n", |
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sum); |
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ret = -EBADMSG; |
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goto exit; |
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} |
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ret = response->data_len; |
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exit: |
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if (ec_msg->command == EC_CMD_REBOOT_EC) |
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msleep(EC_REBOOT_DELAY_MS); |
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return ret; |
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} |
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static void |
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cros_ec_rpmsg_host_event_function(struct work_struct *host_event_work) |
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{ |
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struct cros_ec_rpmsg *ec_rpmsg = container_of(host_event_work, |
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struct cros_ec_rpmsg, |
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host_event_work); |
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cros_ec_irq_thread(0, dev_get_drvdata(&ec_rpmsg->rpdev->dev)); |
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} |
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static int cros_ec_rpmsg_callback(struct rpmsg_device *rpdev, void *data, |
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int len, void *priv, u32 src) |
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{ |
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struct cros_ec_device *ec_dev = dev_get_drvdata(&rpdev->dev); |
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struct cros_ec_rpmsg *ec_rpmsg = ec_dev->priv; |
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struct cros_ec_rpmsg_response *resp; |
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if (!len) { |
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dev_warn(ec_dev->dev, "rpmsg received empty response"); |
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return -EINVAL; |
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} |
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resp = data; |
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len -= offsetof(struct cros_ec_rpmsg_response, data); |
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if (resp->type == HOST_COMMAND_MARK) { |
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if (len > ec_dev->din_size) { |
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dev_warn(ec_dev->dev, |
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"received length %d > din_size %d, truncating", |
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len, ec_dev->din_size); |
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len = ec_dev->din_size; |
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} |
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memcpy(ec_dev->din, resp->data, len); |
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complete(&ec_rpmsg->xfer_ack); |
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} else if (resp->type == HOST_EVENT_MARK) { |
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/* |
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* If the host event is sent before cros_ec_register is |
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* finished, queue the host event. |
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*/ |
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if (ec_rpmsg->probe_done) |
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schedule_work(&ec_rpmsg->host_event_work); |
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else |
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ec_rpmsg->has_pending_host_event = true; |
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} else { |
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dev_warn(ec_dev->dev, "rpmsg received invalid type = %d", |
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resp->type); |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static struct rpmsg_endpoint * |
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cros_ec_rpmsg_create_ept(struct rpmsg_device *rpdev) |
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{ |
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struct rpmsg_channel_info chinfo = {}; |
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strscpy(chinfo.name, rpdev->id.name, RPMSG_NAME_SIZE); |
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chinfo.src = rpdev->src; |
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chinfo.dst = RPMSG_ADDR_ANY; |
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return rpmsg_create_ept(rpdev, cros_ec_rpmsg_callback, NULL, chinfo); |
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} |
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static int cros_ec_rpmsg_probe(struct rpmsg_device *rpdev) |
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{ |
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struct device *dev = &rpdev->dev; |
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struct cros_ec_rpmsg *ec_rpmsg; |
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struct cros_ec_device *ec_dev; |
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int ret; |
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ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL); |
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if (!ec_dev) |
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return -ENOMEM; |
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ec_rpmsg = devm_kzalloc(dev, sizeof(*ec_rpmsg), GFP_KERNEL); |
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if (!ec_rpmsg) |
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return -ENOMEM; |
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ec_dev->dev = dev; |
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ec_dev->priv = ec_rpmsg; |
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ec_dev->cmd_xfer = cros_ec_cmd_xfer_rpmsg; |
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ec_dev->pkt_xfer = cros_ec_pkt_xfer_rpmsg; |
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ec_dev->phys_name = dev_name(&rpdev->dev); |
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ec_dev->din_size = sizeof(struct ec_host_response) + |
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sizeof(struct ec_response_get_protocol_info); |
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ec_dev->dout_size = sizeof(struct ec_host_request); |
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dev_set_drvdata(dev, ec_dev); |
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ec_rpmsg->rpdev = rpdev; |
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init_completion(&ec_rpmsg->xfer_ack); |
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INIT_WORK(&ec_rpmsg->host_event_work, |
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cros_ec_rpmsg_host_event_function); |
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ec_rpmsg->ept = cros_ec_rpmsg_create_ept(rpdev); |
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if (!ec_rpmsg->ept) |
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return -ENOMEM; |
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ret = cros_ec_register(ec_dev); |
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if (ret < 0) { |
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rpmsg_destroy_ept(ec_rpmsg->ept); |
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cancel_work_sync(&ec_rpmsg->host_event_work); |
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return ret; |
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} |
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ec_rpmsg->probe_done = true; |
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if (ec_rpmsg->has_pending_host_event) |
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schedule_work(&ec_rpmsg->host_event_work); |
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return 0; |
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} |
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static void cros_ec_rpmsg_remove(struct rpmsg_device *rpdev) |
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{ |
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struct cros_ec_device *ec_dev = dev_get_drvdata(&rpdev->dev); |
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struct cros_ec_rpmsg *ec_rpmsg = ec_dev->priv; |
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cros_ec_unregister(ec_dev); |
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rpmsg_destroy_ept(ec_rpmsg->ept); |
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cancel_work_sync(&ec_rpmsg->host_event_work); |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int cros_ec_rpmsg_suspend(struct device *dev) |
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{ |
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struct cros_ec_device *ec_dev = dev_get_drvdata(dev); |
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return cros_ec_suspend(ec_dev); |
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} |
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static int cros_ec_rpmsg_resume(struct device *dev) |
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{ |
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struct cros_ec_device *ec_dev = dev_get_drvdata(dev); |
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return cros_ec_resume(ec_dev); |
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} |
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#endif |
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static SIMPLE_DEV_PM_OPS(cros_ec_rpmsg_pm_ops, cros_ec_rpmsg_suspend, |
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cros_ec_rpmsg_resume); |
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static const struct of_device_id cros_ec_rpmsg_of_match[] = { |
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{ .compatible = "google,cros-ec-rpmsg", }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, cros_ec_rpmsg_of_match); |
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static struct rpmsg_driver cros_ec_driver_rpmsg = { |
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.drv = { |
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.name = "cros-ec-rpmsg", |
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.of_match_table = cros_ec_rpmsg_of_match, |
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.pm = &cros_ec_rpmsg_pm_ops, |
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}, |
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.probe = cros_ec_rpmsg_probe, |
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.remove = cros_ec_rpmsg_remove, |
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}; |
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module_rpmsg_driver(cros_ec_driver_rpmsg); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("ChromeOS EC multi function device (rpmsg)");
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