/*
* Writing a frame must not return the number of written bytes.
* It must return either zero for success, or <0 for error.
* In addition, it must not alter the skb
*/
static int nfc_mei_phy_write(void *phy_id, struct sk_buff *skb)
{
struct nfc_mei_phy *phy = phy_id;
int r;
MEI_DUMP_SKB_OUT("mei frame sent", skb);
r = mei_cl_send(phy->device, skb->data, skb->len);
if (r > 0)
r = 0;
return r;
}
static int mei_nfc_if_version(struct nfc_mei_phy *phy)
{
struct mei_nfc_cmd cmd;
struct mei_nfc_reply *reply = NULL;
struct mei_nfc_if_version *version;
size_t if_version_length;
int bytes_recv, r;
pr_info("%s\n", __func__);
memset(&cmd, 0, sizeof(struct mei_nfc_cmd));
cmd.hdr.cmd = MEI_NFC_CMD_MAINTENANCE;
cmd.hdr.data_size = 1;
cmd.sub_command = MEI_NFC_SUBCMD_IF_VERSION;
MEI_DUMP_NFC_HDR("version", &cmd.hdr);
r = mei_cl_send(phy->device, (u8 *)&cmd, sizeof(struct mei_nfc_cmd));
if (r < 0) {
pr_err("Could not send IF version cmd\n");
return r;
}
/* to be sure on the stack we alloc memory */
if_version_length = sizeof(struct mei_nfc_reply) +
sizeof(struct mei_nfc_if_version);
reply = kzalloc(if_version_length, GFP_KERNEL);
if (!reply)
return -ENOMEM;
bytes_recv = mei_cl_recv(phy->device, (u8 *)reply, if_version_length);
if (bytes_recv < 0 || bytes_recv < sizeof(struct mei_nfc_reply)) {
pr_err("Could not read IF version\n");
r = -EIO;
goto err;
}
version = (struct mei_nfc_if_version *)reply->data;
phy->fw_ivn = version->fw_ivn;
phy->vendor_id = version->vendor_id;
phy->radio_type = version->radio_type;
err:
kfree(reply);
return r;
}
static int mei_nfc_send(struct nfc_mei_phy *phy, u8 *buf, size_t length)
{
struct mei_nfc_hdr *hdr;
u8 *mei_buf;
int err;
err = -ENOMEM;
mei_buf = kzalloc(length + MEI_NFC_HEADER_SIZE, GFP_KERNEL);
if (!mei_buf)
goto out;
hdr = (struct mei_nfc_hdr *)mei_buf;
hdr->cmd = MEI_NFC_CMD_HCI_SEND;
hdr->status = 0;
hdr->req_id = phy->req_id;
hdr->reserved = 0;
hdr->data_size = length;
MEI_DUMP_NFC_HDR("send", hdr);
memcpy(mei_buf + MEI_NFC_HEADER_SIZE, buf, length);
err = mei_cl_send(phy->device, mei_buf, length + MEI_NFC_HEADER_SIZE);
if (err < 0)
goto out;
if (!wait_event_interruptible_timeout(phy->send_wq,
phy->recv_req_id == phy->req_id, HZ)) {
pr_err("NFC MEI command timeout\n");
err = -ETIME;
} else {
phy->req_id++;
}
out:
kfree(mei_buf);
return err;
}
static int mei_nfc_connect(struct nfc_mei_phy *phy)
{
struct mei_nfc_cmd *cmd, *reply;
struct mei_nfc_connect *connect;
struct mei_nfc_connect_resp *connect_resp;
size_t connect_length, connect_resp_length;
int bytes_recv, r;
pr_info("%s\n", __func__);
connect_length = sizeof(struct mei_nfc_cmd) +
sizeof(struct mei_nfc_connect);
connect_resp_length = sizeof(struct mei_nfc_cmd) +
sizeof(struct mei_nfc_connect_resp);
cmd = kzalloc(connect_length, GFP_KERNEL);
if (!cmd)
return -ENOMEM;
connect = (struct mei_nfc_connect *)cmd->data;
reply = kzalloc(connect_resp_length, GFP_KERNEL);
if (!reply) {
kfree(cmd);
return -ENOMEM;
}
connect_resp = (struct mei_nfc_connect_resp *)reply->data;
cmd->hdr.cmd = MEI_NFC_CMD_MAINTENANCE;
cmd->hdr.data_size = 3;
cmd->sub_command = MEI_NFC_SUBCMD_CONNECT;
connect->fw_ivn = phy->fw_ivn;
connect->vendor_id = phy->vendor_id;
MEI_DUMP_NFC_HDR("connect request", &cmd->hdr);
r = mei_cl_send(phy->device, (u8 *)cmd, connect_length);
if (r < 0) {
pr_err("Could not send connect cmd %d\n", r);
goto err;
}
bytes_recv = mei_cl_recv(phy->device, (u8 *)reply, connect_resp_length);
if (bytes_recv < 0) {
r = bytes_recv;
pr_err("Could not read connect response %d\n", r);
goto err;
}
MEI_DUMP_NFC_HDR("connect reply", &reply->hdr);
pr_info("IVN 0x%x Vendor ID 0x%x\n",
connect_resp->fw_ivn, connect_resp->vendor_id);
pr_info("ME FW %d.%d.%d.%d\n",
connect_resp->me_major, connect_resp->me_minor,
connect_resp->me_hotfix, connect_resp->me_build);
r = 0;
err:
kfree(reply);
kfree(cmd);
return r;
}
