NFC: driver for TI shared transport
Signed-off-by: Ilan Elias <ilane@ti.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ilan Elias
John W. Linville
parent
6a2968aaf5
commit
93aead4642
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@ -27,4 +27,15 @@ config NFC_PN533
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Say Y here to compile support for PN533 devices into the
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kernel or say M to compile it as module (pn533).
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config NFC_WILINK
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tristate "Texas Instruments NFC WiLink driver"
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depends on TI_ST
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help
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This enables the NFC driver for Texas Instrument's BT/FM/GPS/NFC
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combo devices. This makes use of shared transport line discipline
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core driver to communicate with the NFC core of the combo chip.
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Say Y here to compile support for Texas Instrument's NFC WiLink driver
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into the kernel or say M to compile it as module.
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endmenu
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@ -4,5 +4,6 @@
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obj-$(CONFIG_PN544_NFC) += pn544.o
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obj-$(CONFIG_NFC_PN533) += pn533.o
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obj-$(CONFIG_NFC_WILINK) += nfcwilink.o
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ccflags-$(CONFIG_NFC_DEBUG) := -DDEBUG
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@ -0,0 +1,342 @@
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/*
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* Texas Instrument's NFC Driver For Shared Transport.
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*
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* NFC Driver acts as interface between NCI core and
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* TI Shared Transport Layer.
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*
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* Copyright (C) 2011 Texas Instruments, Inc.
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*
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* Written by Ilan Elias <ilane@ti.com>
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*
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* Acknowledgements:
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* This file is based on btwilink.c, which was written
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* by Raja Mani and Pavan Savoy.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/platform_device.h>
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#include <linux/nfc.h>
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#include <net/nfc/nci.h>
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#include <net/nfc/nci_core.h>
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#include <linux/ti_wilink_st.h>
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#define NFCWILINK_CHNL 12
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#define NFCWILINK_OPCODE 7
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#define NFCWILINK_MAX_FRAME_SIZE 300
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#define NFCWILINK_HDR_LEN 4
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#define NFCWILINK_OFFSET_LEN_IN_HDR 1
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#define NFCWILINK_LEN_SIZE 2
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#define NFCWILINK_REGISTER_TIMEOUT 8000 /* 8 sec */
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struct nfcwilink_hdr {
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u8 chnl;
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u8 opcode;
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u16 len;
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} __packed;
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struct nfcwilink {
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struct platform_device *pdev;
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struct nci_dev *ndev;
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unsigned long flags;
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char st_register_cb_status;
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long (*st_write) (struct sk_buff *);
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struct completion st_register_completed;
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};
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/* NFCWILINK driver flags */
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enum {
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NFCWILINK_RUNNING,
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};
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/* Called by ST when registration is complete */
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static void nfcwilink_register_complete(void *priv_data, char data)
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{
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struct nfcwilink *drv = priv_data;
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nfc_dev_dbg(&drv->pdev->dev, "register_complete entry");
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/* store ST registration status */
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drv->st_register_cb_status = data;
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/* complete the wait in nfc_st_open() */
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complete(&drv->st_register_completed);
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}
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/* Called by ST when receive data is available */
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static long nfcwilink_receive(void *priv_data, struct sk_buff *skb)
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{
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struct nfcwilink *drv = priv_data;
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int rc;
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nfc_dev_dbg(&drv->pdev->dev, "receive entry, len %d", skb->len);
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if (!skb)
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return -EFAULT;
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if (!drv) {
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kfree_skb(skb);
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return -EFAULT;
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}
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/* strip the ST header
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(apart for the chnl byte, which is not received in the hdr) */
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skb_pull(skb, (NFCWILINK_HDR_LEN-1));
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skb->dev = (void *) drv->ndev;
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/* Forward skb to NCI core layer */
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rc = nci_recv_frame(skb);
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if (rc < 0) {
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nfc_dev_err(&drv->pdev->dev, "nci_recv_frame failed %d", rc);
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return rc;
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}
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return 0;
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}
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/* protocol structure registered with ST */
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static struct st_proto_s nfcwilink_proto = {
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.chnl_id = NFCWILINK_CHNL,
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.max_frame_size = NFCWILINK_MAX_FRAME_SIZE,
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.hdr_len = (NFCWILINK_HDR_LEN-1), /* not including chnl byte */
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.offset_len_in_hdr = NFCWILINK_OFFSET_LEN_IN_HDR,
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.len_size = NFCWILINK_LEN_SIZE,
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.reserve = 0,
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.recv = nfcwilink_receive,
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.reg_complete_cb = nfcwilink_register_complete,
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.write = NULL,
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};
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static int nfcwilink_open(struct nci_dev *ndev)
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{
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struct nfcwilink *drv = nci_get_drvdata(ndev);
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unsigned long comp_ret;
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int rc;
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nfc_dev_dbg(&drv->pdev->dev, "open entry");
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if (test_and_set_bit(NFCWILINK_RUNNING, &drv->flags)) {
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rc = -EBUSY;
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goto exit;
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}
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nfcwilink_proto.priv_data = drv;
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init_completion(&drv->st_register_completed);
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drv->st_register_cb_status = -EINPROGRESS;
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rc = st_register(&nfcwilink_proto);
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if (rc < 0) {
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if (rc == -EINPROGRESS) {
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comp_ret = wait_for_completion_timeout(
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&drv->st_register_completed,
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msecs_to_jiffies(NFCWILINK_REGISTER_TIMEOUT));
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nfc_dev_dbg(&drv->pdev->dev,
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"wait_for_completion_timeout returned %ld",
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comp_ret);
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if (comp_ret == 0) {
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/* timeout */
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rc = -ETIMEDOUT;
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goto clear_exit;
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} else if (drv->st_register_cb_status != 0) {
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rc = drv->st_register_cb_status;
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nfc_dev_err(&drv->pdev->dev,
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"st_register_cb failed %d", rc);
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goto clear_exit;
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}
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} else {
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nfc_dev_err(&drv->pdev->dev,
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"st_register failed %d", rc);
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goto clear_exit;
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}
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}
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/* st_register MUST fill the write callback */
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BUG_ON(nfcwilink_proto.write == NULL);
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drv->st_write = nfcwilink_proto.write;
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goto exit;
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clear_exit:
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clear_bit(NFCWILINK_RUNNING, &drv->flags);
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exit:
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return rc;
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}
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static int nfcwilink_close(struct nci_dev *ndev)
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{
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struct nfcwilink *drv = nci_get_drvdata(ndev);
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int rc;
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nfc_dev_dbg(&drv->pdev->dev, "close entry");
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if (!test_and_clear_bit(NFCWILINK_RUNNING, &drv->flags))
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return 0;
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rc = st_unregister(&nfcwilink_proto);
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if (rc)
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nfc_dev_err(&drv->pdev->dev, "st_unregister failed %d", rc);
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drv->st_write = NULL;
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return rc;
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}
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static int nfcwilink_send(struct sk_buff *skb)
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{
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struct nci_dev *ndev = (struct nci_dev *)skb->dev;
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struct nfcwilink *drv = nci_get_drvdata(ndev);
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struct nfcwilink_hdr hdr = {NFCWILINK_CHNL, NFCWILINK_OPCODE, 0x0000};
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long len;
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nfc_dev_dbg(&drv->pdev->dev, "send entry, len %d", skb->len);
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if (!test_bit(NFCWILINK_RUNNING, &drv->flags))
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return -EBUSY;
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/* add the ST hdr to the start of the buffer */
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hdr.len = skb->len;
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memcpy(skb_push(skb, NFCWILINK_HDR_LEN), &hdr, NFCWILINK_HDR_LEN);
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/* Insert skb to shared transport layer's transmit queue.
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* Freeing skb memory is taken care in shared transport layer,
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* so don't free skb memory here.
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*/
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len = drv->st_write(skb);
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if (len < 0) {
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kfree_skb(skb);
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nfc_dev_err(&drv->pdev->dev, "st_write failed %ld", len);
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return -EFAULT;
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}
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return 0;
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}
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static struct nci_ops nfcwilink_ops = {
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.open = nfcwilink_open,
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.close = nfcwilink_close,
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.send = nfcwilink_send,
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};
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static int nfcwilink_probe(struct platform_device *pdev)
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{
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static struct nfcwilink *drv;
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int rc;
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u32 protocols;
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nfc_dev_dbg(&pdev->dev, "probe entry");
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drv = kzalloc(sizeof(struct nfcwilink), GFP_KERNEL);
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if (!drv) {
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rc = -ENOMEM;
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goto exit;
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}
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drv->pdev = pdev;
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protocols = NFC_PROTO_JEWEL_MASK
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| NFC_PROTO_MIFARE_MASK | NFC_PROTO_FELICA_MASK
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| NFC_PROTO_ISO14443_MASK
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| NFC_PROTO_NFC_DEP_MASK;
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drv->ndev = nci_allocate_device(&nfcwilink_ops,
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protocols,
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NFCWILINK_HDR_LEN,
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0);
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if (!drv->ndev) {
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nfc_dev_err(&pdev->dev, "nci_allocate_device failed");
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rc = -ENOMEM;
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goto free_exit;
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}
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nci_set_parent_dev(drv->ndev, &pdev->dev);
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nci_set_drvdata(drv->ndev, drv);
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rc = nci_register_device(drv->ndev);
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if (rc < 0) {
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nfc_dev_err(&pdev->dev, "nci_register_device failed %d", rc);
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goto free_dev_exit;
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}
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dev_set_drvdata(&pdev->dev, drv);
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goto exit;
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free_dev_exit:
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nci_free_device(drv->ndev);
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free_exit:
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kfree(drv);
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exit:
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return rc;
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}
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static int nfcwilink_remove(struct platform_device *pdev)
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{
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struct nfcwilink *drv = dev_get_drvdata(&pdev->dev);
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struct nci_dev *ndev;
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nfc_dev_dbg(&pdev->dev, "remove entry");
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if (!drv)
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return -EFAULT;
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ndev = drv->ndev;
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nci_unregister_device(ndev);
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nci_free_device(ndev);
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kfree(drv);
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dev_set_drvdata(&pdev->dev, NULL);
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return 0;
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}
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static struct platform_driver nfcwilink_driver = {
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.probe = nfcwilink_probe,
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.remove = nfcwilink_remove,
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.driver = {
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.name = "nfcwilink",
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.owner = THIS_MODULE,
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},
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};
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/* ------- Module Init/Exit interfaces ------ */
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static int __init nfcwilink_init(void)
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{
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printk(KERN_INFO "NFC Driver for TI WiLink");
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return platform_driver_register(&nfcwilink_driver);
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}
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static void __exit nfcwilink_exit(void)
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{
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platform_driver_unregister(&nfcwilink_driver);
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}
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module_init(nfcwilink_init);
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module_exit(nfcwilink_exit);
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/* ------ Module Info ------ */
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MODULE_AUTHOR("Ilan Elias <ilane@ti.com>");
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MODULE_DESCRIPTION("NFC Driver for TI Shared Transport");
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MODULE_LICENSE("GPL");
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