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/*
* Marvell NFC driver: major functions
*
* Copyright (C) 2014, Marvell International Ltd.
*
* This software file (the "File") is distributed by Marvell International
* Ltd. under the terms of the GNU General Public License Version 2, June 1991
* (the "License"). You may use, redistribute and/or modify this File in
* accordance with the terms and conditions of the License, a copy of which
* is available on the worldwide web at
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
*
* THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
* IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
* ARE EXPRESSLY DISCLAIMED. The License provides additional details about
* this warranty disclaimer.
*/
#include <linux/module.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/nfc.h>
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>
#include "nfcmrvl.h"
#define VERSION "1.0"
static int nfcmrvl_nci_open(struct nci_dev *ndev)
{
struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
int err;
if (test_and_set_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
return 0;
err = priv->if_ops->nci_open(priv);
if (err)
clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags);
return err;
}
static int nfcmrvl_nci_close(struct nci_dev *ndev)
{
struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
if (!test_and_clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
return 0;
priv->if_ops->nci_close(priv);
return 0;
}
static int nfcmrvl_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
{
struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
nfc_info(priv->dev, "send entry, len %d\n", skb->len);
skb->dev = (void *)ndev;
if (!test_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
return -EBUSY;
if (priv->hci_muxed) {
unsigned char *hdr;
unsigned char len = skb->len;
hdr = (char *) skb_push(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
hdr[0] = NFCMRVL_HCI_COMMAND_CODE;
hdr[1] = NFCMRVL_HCI_OGF;
hdr[2] = NFCMRVL_HCI_OCF;
hdr[3] = len;
}
return priv->if_ops->nci_send(priv, skb);
}
static int nfcmrvl_nci_setup(struct nci_dev *ndev)
{
return 0;
}
static struct nci_ops nfcmrvl_nci_ops = {
.open = nfcmrvl_nci_open,
.close = nfcmrvl_nci_close,
.send = nfcmrvl_nci_send,
.setup = nfcmrvl_nci_setup,
};
struct nfcmrvl_private *nfcmrvl_nci_register_dev(void *drv_data,
struct nfcmrvl_if_ops *ops,
struct device *dev,
unsigned int flags)
{
struct nfcmrvl_private *priv;
int rc;
int headroom = 0;
u32 protocols;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return ERR_PTR(-ENOMEM);
priv->drv_data = drv_data;
priv->if_ops = ops;
priv->dev = dev;
priv->hci_muxed = (flags & NFCMRVL_DEV_FLAG_HCI_MUXED) ? 1 : 0;
priv->reset_n_io = NFCMRVL_DEV_FLAG_GET_RESET_N_IO(flags);
if (priv->reset_n_io) {
rc = devm_gpio_request_one(dev,
priv->reset_n_io,
GPIOF_OUT_INIT_LOW,
"nfcmrvl_reset_n");
if (rc < 0)
nfc_err(dev, "failed to request reset_n io\n");
}
if (priv->hci_muxed)
headroom = NFCMRVL_HCI_EVENT_HEADER_SIZE;
protocols = NFC_PROTO_JEWEL_MASK
| NFC_PROTO_MIFARE_MASK | NFC_PROTO_FELICA_MASK
| NFC_PROTO_ISO14443_MASK
| NFC_PROTO_ISO14443_B_MASK
| NFC_PROTO_NFC_DEP_MASK;
priv->ndev = nci_allocate_device(&nfcmrvl_nci_ops, protocols,
headroom, 0);
if (!priv->ndev) {
nfc_err(dev, "nci_allocate_device failed\n");
rc = -ENOMEM;
goto error;
}
nci_set_drvdata(priv->ndev, priv);
nfcmrvl_chip_reset(priv);
rc = nci_register_device(priv->ndev);
if (rc) {
nfc_err(dev, "nci_register_device failed %d\n", rc);
nci_free_device(priv->ndev);
goto error;
}
nfc_info(dev, "registered with nci successfully\n");
return priv;
error:
kfree(priv);
return ERR_PTR(rc);
}
EXPORT_SYMBOL_GPL(nfcmrvl_nci_register_dev);
void nfcmrvl_nci_unregister_dev(struct nfcmrvl_private *priv)
{
struct nci_dev *ndev = priv->ndev;
nci_unregister_device(ndev);
nci_free_device(ndev);
kfree(priv);
}
EXPORT_SYMBOL_GPL(nfcmrvl_nci_unregister_dev);
int nfcmrvl_nci_recv_frame(struct nfcmrvl_private *priv, struct sk_buff *skb)
{
if (priv->hci_muxed) {
if (skb->data[0] == NFCMRVL_HCI_EVENT_CODE &&
skb->data[1] == NFCMRVL_HCI_NFC_EVENT_CODE) {
/* Data packet, let's extract NCI payload */
skb_pull(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
} else {
/* Skip this packet */
kfree_skb(skb);
return 0;
}
}
if (test_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
nci_recv_frame(priv->ndev, skb);
else {
/* Drop this packet since nobody wants it */
kfree_skb(skb);
return 0;
}
return 0;
}
EXPORT_SYMBOL_GPL(nfcmrvl_nci_recv_frame);
void nfcmrvl_chip_reset(struct nfcmrvl_private *priv)
{
/*
* This function does not take care if someone is using the device.
* To be improved.
*/
if (priv->reset_n_io) {
nfc_info(priv->dev, "reset the chip\n");
gpio_set_value(priv->reset_n_io, 0);
usleep_range(5000, 10000);
gpio_set_value(priv->reset_n_io, 1);
} else
nfc_info(priv->dev, "no reset available on this interface\n");
}
MODULE_AUTHOR("Marvell International Ltd.");
MODULE_DESCRIPTION("Marvell NFC driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL v2");
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