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-rw-r--r--drivers/nfc/mei_phy.c416
1 files changed, 416 insertions, 0 deletions
diff --git a/drivers/nfc/mei_phy.c b/drivers/nfc/mei_phy.c
new file mode 100644
index 000000000..8a04c5e02
--- /dev/null
+++ b/drivers/nfc/mei_phy.c
@@ -0,0 +1,416 @@
+/*
+ * MEI Library for mei bus nfc device access
+ *
+ * Copyright (C) 2013 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/nfc.h>
+
+#include "mei_phy.h"
+
+struct mei_nfc_hdr {
+ u8 cmd;
+ u8 status;
+ u16 req_id;
+ u32 reserved;
+ u16 data_size;
+} __packed;
+
+struct mei_nfc_cmd {
+ struct mei_nfc_hdr hdr;
+ u8 sub_command;
+ u8 data[];
+} __packed;
+
+struct mei_nfc_reply {
+ struct mei_nfc_hdr hdr;
+ u8 sub_command;
+ u8 reply_status;
+ u8 data[];
+} __packed;
+
+struct mei_nfc_if_version {
+ u8 radio_version_sw[3];
+ u8 reserved[3];
+ u8 radio_version_hw[3];
+ u8 i2c_addr;
+ u8 fw_ivn;
+ u8 vendor_id;
+ u8 radio_type;
+} __packed;
+
+struct mei_nfc_connect {
+ u8 fw_ivn;
+ u8 vendor_id;
+} __packed;
+
+struct mei_nfc_connect_resp {
+ u8 fw_ivn;
+ u8 vendor_id;
+ u16 me_major;
+ u16 me_minor;
+ u16 me_hotfix;
+ u16 me_build;
+} __packed;
+
+
+#define MEI_NFC_CMD_MAINTENANCE 0x00
+#define MEI_NFC_CMD_HCI_SEND 0x01
+#define MEI_NFC_CMD_HCI_RECV 0x02
+
+#define MEI_NFC_SUBCMD_CONNECT 0x00
+#define MEI_NFC_SUBCMD_IF_VERSION 0x01
+
+#define MEI_NFC_MAX_READ (MEI_NFC_HEADER_SIZE + MEI_NFC_MAX_HCI_PAYLOAD)
+
+#define MEI_DUMP_SKB_IN(info, skb) \
+do { \
+ pr_debug("%s:\n", info); \
+ print_hex_dump_debug("mei in : ", DUMP_PREFIX_OFFSET, \
+ 16, 1, (skb)->data, (skb)->len, false); \
+} while (0)
+
+#define MEI_DUMP_SKB_OUT(info, skb) \
+do { \
+ pr_debug("%s:\n", info); \
+ print_hex_dump_debug("mei out: ", DUMP_PREFIX_OFFSET, \
+ 16, 1, (skb)->data, (skb)->len, false); \
+} while (0)
+
+#define MEI_DUMP_NFC_HDR(info, _hdr) \
+do { \
+ pr_debug("%s:\n", info); \
+ pr_debug("cmd=%02d status=%d req_id=%d rsvd=%d size=%d\n", \
+ (_hdr)->cmd, (_hdr)->status, (_hdr)->req_id, \
+ (_hdr)->reserved, (_hdr)->data_size); \
+} while (0)
+
+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_cldev_send(phy->cldev, (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_cldev_recv(phy->cldev, (u8 *)reply, if_version_length);
+ if (bytes_recv < 0 || bytes_recv < if_version_length) {
+ 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_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_cldev_send(phy->cldev, (u8 *)cmd, connect_length);
+ if (r < 0) {
+ pr_err("Could not send connect cmd %d\n", r);
+ goto err;
+ }
+
+ bytes_recv = mei_cldev_recv(phy->cldev, (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;
+}
+
+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_cldev_send(phy->cldev, 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;
+}
+
+/*
+ * 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_nfc_send(phy, skb->data, skb->len);
+ if (r > 0)
+ r = 0;
+
+ return r;
+}
+
+static int mei_nfc_recv(struct nfc_mei_phy *phy, u8 *buf, size_t length)
+{
+ struct mei_nfc_hdr *hdr;
+ int received_length;
+
+ received_length = mei_cldev_recv(phy->cldev, buf, length);
+ if (received_length < 0)
+ return received_length;
+
+ hdr = (struct mei_nfc_hdr *) buf;
+
+ MEI_DUMP_NFC_HDR("receive", hdr);
+ if (hdr->cmd == MEI_NFC_CMD_HCI_SEND) {
+ phy->recv_req_id = hdr->req_id;
+ wake_up(&phy->send_wq);
+
+ return 0;
+ }
+
+ return received_length;
+}
+
+
+static void nfc_mei_rx_cb(struct mei_cl_device *cldev)
+{
+ struct nfc_mei_phy *phy = mei_cldev_get_drvdata(cldev);
+ struct sk_buff *skb;
+ int reply_size;
+
+ if (!phy)
+ return;
+
+ if (phy->hard_fault != 0)
+ return;
+
+ skb = alloc_skb(MEI_NFC_MAX_READ, GFP_KERNEL);
+ if (!skb)
+ return;
+
+ reply_size = mei_nfc_recv(phy, skb->data, MEI_NFC_MAX_READ);
+ if (reply_size < MEI_NFC_HEADER_SIZE) {
+ kfree_skb(skb);
+ return;
+ }
+
+ skb_put(skb, reply_size);
+ skb_pull(skb, MEI_NFC_HEADER_SIZE);
+
+ MEI_DUMP_SKB_IN("mei frame read", skb);
+
+ nfc_hci_recv_frame(phy->hdev, skb);
+}
+
+static int nfc_mei_phy_enable(void *phy_id)
+{
+ int r;
+ struct nfc_mei_phy *phy = phy_id;
+
+ pr_info("%s\n", __func__);
+
+ if (phy->powered == 1)
+ return 0;
+
+ r = mei_cldev_enable(phy->cldev);
+ if (r < 0) {
+ pr_err("Could not enable device %d\n", r);
+ return r;
+ }
+
+ r = mei_nfc_if_version(phy);
+ if (r < 0) {
+ pr_err("Could not enable device %d\n", r);
+ goto err;
+ }
+
+ r = mei_nfc_connect(phy);
+ if (r < 0) {
+ pr_err("Could not connect to device %d\n", r);
+ goto err;
+ }
+
+ r = mei_cldev_register_rx_cb(phy->cldev, nfc_mei_rx_cb);
+ if (r) {
+ pr_err("Event cb registration failed %d\n", r);
+ goto err;
+ }
+
+ phy->powered = 1;
+
+ return 0;
+
+err:
+ phy->powered = 0;
+ mei_cldev_disable(phy->cldev);
+ return r;
+}
+
+static void nfc_mei_phy_disable(void *phy_id)
+{
+ struct nfc_mei_phy *phy = phy_id;
+
+ pr_info("%s\n", __func__);
+
+ mei_cldev_disable(phy->cldev);
+
+ phy->powered = 0;
+}
+
+struct nfc_phy_ops mei_phy_ops = {
+ .write = nfc_mei_phy_write,
+ .enable = nfc_mei_phy_enable,
+ .disable = nfc_mei_phy_disable,
+};
+EXPORT_SYMBOL_GPL(mei_phy_ops);
+
+struct nfc_mei_phy *nfc_mei_phy_alloc(struct mei_cl_device *cldev)
+{
+ struct nfc_mei_phy *phy;
+
+ phy = kzalloc(sizeof(struct nfc_mei_phy), GFP_KERNEL);
+ if (!phy)
+ return NULL;
+
+ phy->cldev = cldev;
+ init_waitqueue_head(&phy->send_wq);
+ mei_cldev_set_drvdata(cldev, phy);
+
+ return phy;
+}
+EXPORT_SYMBOL_GPL(nfc_mei_phy_alloc);
+
+void nfc_mei_phy_free(struct nfc_mei_phy *phy)
+{
+ mei_cldev_disable(phy->cldev);
+ kfree(phy);
+}
+EXPORT_SYMBOL_GPL(nfc_mei_phy_free);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("mei bus NFC device interface");
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