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linux/drivers/nfc/pn533/usb.c
Johannes Berg 59ae1d127a networking: introduce and use skb_put_data() 
A common pattern with skb_put() is to just want to memcpy()
some data into the new space, introduce skb_put_data() for
this.

An spatch similar to the one for skb_put_zero() converts many
of the places using it:

    @@
    identifier p, p2;
    expression len, skb, data;
    type t, t2;
    @@
    (
    -p = skb_put(skb, len);
    +p = skb_put_data(skb, data, len);
    |
    -p = (t)skb_put(skb, len);
    +p = skb_put_data(skb, data, len);
    )
    (
    p2 = (t2)p;
    -memcpy(p2, data, len);
    |
    -memcpy(p, data, len);
    )

    @@
    type t, t2;
    identifier p, p2;
    expression skb, data;
    @@
    t *p;
    ...
    (
    -p = skb_put(skb, sizeof(t));
    +p = skb_put_data(skb, data, sizeof(t));
    |
    -p = (t *)skb_put(skb, sizeof(t));
    +p = skb_put_data(skb, data, sizeof(t));
    )
    (
    p2 = (t2)p;
    -memcpy(p2, data, sizeof(*p));
    |
    -memcpy(p, data, sizeof(*p));
    )

    @@
    expression skb, len, data;
    @@
    -memcpy(skb_put(skb, len), data, len);
    +skb_put_data(skb, data, len);

(again, manually post-processed to retain some comments)

Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-16 11:48:37 -04:00

599 lines
14 KiB
C
Raw Blame History

/*
* Driver for NXP PN533 NFC Chip - USB transport layer
*
* Copyright (C) 2011 Instituto Nokia de Tecnologia
* Copyright (C) 2012-2013 Tieto Poland
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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/>.
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/nfc.h>
#include <linux/netdevice.h>
#include <net/nfc/nfc.h>
#include "pn533.h"
#define VERSION "0.1"
#define PN533_VENDOR_ID 0x4CC
#define PN533_PRODUCT_ID 0x2533
#define SCM_VENDOR_ID 0x4E6
#define SCL3711_PRODUCT_ID 0x5591
#define SONY_VENDOR_ID 0x054c
#define PASORI_PRODUCT_ID 0x02e1
#define ACS_VENDOR_ID 0x072f
#define ACR122U_PRODUCT_ID 0x2200
static const struct usb_device_id pn533_usb_table[] = {
{ USB_DEVICE(PN533_VENDOR_ID, PN533_PRODUCT_ID),
.driver_info = PN533_DEVICE_STD },
{ USB_DEVICE(SCM_VENDOR_ID, SCL3711_PRODUCT_ID),
.driver_info = PN533_DEVICE_STD },
{ USB_DEVICE(SONY_VENDOR_ID, PASORI_PRODUCT_ID),
.driver_info = PN533_DEVICE_PASORI },
{ USB_DEVICE(ACS_VENDOR_ID, ACR122U_PRODUCT_ID),
.driver_info = PN533_DEVICE_ACR122U },
{ }
};
MODULE_DEVICE_TABLE(usb, pn533_usb_table);
struct pn533_usb_phy {
struct usb_device *udev;
struct usb_interface *interface;
struct urb *out_urb;
struct urb *in_urb;
struct pn533 *priv;
};
static void pn533_recv_response(struct urb *urb)
{
struct pn533_usb_phy *phy = urb->context;
struct sk_buff *skb = NULL;
if (!urb->status) {
skb = alloc_skb(urb->actual_length, GFP_KERNEL);
if (!skb) {
nfc_err(&phy->udev->dev, "failed to alloc memory\n");
} else {
skb_put_data(skb, urb->transfer_buffer,
urb->actual_length);
}
}
pn533_recv_frame(phy->priv, skb, urb->status);
}
static int pn533_submit_urb_for_response(struct pn533_usb_phy *phy, gfp_t flags)
{
phy->in_urb->complete = pn533_recv_response;
return usb_submit_urb(phy->in_urb, flags);
}
static void pn533_recv_ack(struct urb *urb)
{
struct pn533_usb_phy *phy = urb->context;
struct pn533 *priv = phy->priv;
struct pn533_cmd *cmd = priv->cmd;
struct pn533_std_frame *in_frame;
int rc;
cmd->status = urb->status;
switch (urb->status) {
case 0:
break; /* success */
case -ECONNRESET:
case -ENOENT:
dev_dbg(&phy->udev->dev,
"The urb has been stopped (status %d)\n",
urb->status);
goto sched_wq;
case -ESHUTDOWN:
default:
nfc_err(&phy->udev->dev,
"Urb failure (status %d)\n", urb->status);
goto sched_wq;
}
in_frame = phy->in_urb->transfer_buffer;
if (!pn533_rx_frame_is_ack(in_frame)) {
nfc_err(&phy->udev->dev, "Received an invalid ack\n");
cmd->status = -EIO;
goto sched_wq;
}
rc = pn533_submit_urb_for_response(phy, GFP_ATOMIC);
if (rc) {
nfc_err(&phy->udev->dev,
"usb_submit_urb failed with result %d\n", rc);
cmd->status = rc;
goto sched_wq;
}
return;
sched_wq:
queue_work(priv->wq, &priv->cmd_complete_work);
}
static int pn533_submit_urb_for_ack(struct pn533_usb_phy *phy, gfp_t flags)
{
phy->in_urb->complete = pn533_recv_ack;
return usb_submit_urb(phy->in_urb, flags);
}
static int pn533_usb_send_ack(struct pn533 *dev, gfp_t flags)
{
struct pn533_usb_phy *phy = dev->phy;
static const u8 ack[6] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
/* spec 7.1.1.3: Preamble, SoPC (2), ACK Code (2), Postamble */
int rc;
phy->out_urb->transfer_buffer = (u8 *)ack;
phy->out_urb->transfer_buffer_length = sizeof(ack);
rc = usb_submit_urb(phy->out_urb, flags);
return rc;
}
static int pn533_usb_send_frame(struct pn533 *dev,
struct sk_buff *out)
{
struct pn533_usb_phy *phy = dev->phy;
int rc;
if (phy->priv == NULL)
phy->priv = dev;
phy->out_urb->transfer_buffer = out->data;
phy->out_urb->transfer_buffer_length = out->len;
print_hex_dump_debug("PN533 TX: ", DUMP_PREFIX_NONE, 16, 1,
out->data, out->len, false);
rc = usb_submit_urb(phy->out_urb, GFP_KERNEL);
if (rc)
return rc;
if (dev->protocol_type == PN533_PROTO_REQ_RESP) {
/* request for response for sent packet directly */
rc = pn533_submit_urb_for_response(phy, GFP_ATOMIC);
if (rc)
goto error;
} else if (dev->protocol_type == PN533_PROTO_REQ_ACK_RESP) {
/* request for ACK if that's the case */
rc = pn533_submit_urb_for_ack(phy, GFP_KERNEL);
if (rc)
goto error;
}
return 0;
error:
usb_unlink_urb(phy->out_urb);
return rc;
}
static void pn533_usb_abort_cmd(struct pn533 *dev, gfp_t flags)
{
struct pn533_usb_phy *phy = dev->phy;
/* ACR122U does not support any command which aborts last
* issued command i.e. as ACK for standard PN533. Additionally,
* it behaves stange, sending broken or incorrect responses,
* when we cancel urb before the chip will send response.
*/
if (dev->device_type == PN533_DEVICE_ACR122U)
return;
/* An ack will cancel the last issued command */
pn533_usb_send_ack(dev, flags);
/* cancel the urb request */
usb_kill_urb(phy->in_urb);
}
/* ACR122 specific structs and fucntions */
/* ACS ACR122 pn533 frame definitions */
#define PN533_ACR122_TX_FRAME_HEADER_LEN (sizeof(struct pn533_acr122_tx_frame) \
+ 2)
#define PN533_ACR122_TX_FRAME_TAIL_LEN 0
#define PN533_ACR122_RX_FRAME_HEADER_LEN (sizeof(struct pn533_acr122_rx_frame) \
+ 2)
#define PN533_ACR122_RX_FRAME_TAIL_LEN 2
#define PN533_ACR122_FRAME_MAX_PAYLOAD_LEN PN533_STD_FRAME_MAX_PAYLOAD_LEN
/* CCID messages types */
#define PN533_ACR122_PC_TO_RDR_ICCPOWERON 0x62
#define PN533_ACR122_PC_TO_RDR_ESCAPE 0x6B
#define PN533_ACR122_RDR_TO_PC_ESCAPE 0x83
struct pn533_acr122_ccid_hdr {
u8 type;
u32 datalen;
u8 slot;
u8 seq;
/*
* 3 msg specific bytes or status, error and 1 specific
* byte for reposnse msg
*/
u8 params[3];
u8 data[]; /* payload */
} __packed;
struct pn533_acr122_apdu_hdr {
u8 class;
u8 ins;
u8 p1;
u8 p2;
} __packed;
struct pn533_acr122_tx_frame {
struct pn533_acr122_ccid_hdr ccid;
struct pn533_acr122_apdu_hdr apdu;
u8 datalen;
u8 data[]; /* pn533 frame: TFI ... */
} __packed;
struct pn533_acr122_rx_frame {
struct pn533_acr122_ccid_hdr ccid;
u8 data[]; /* pn533 frame : TFI ... */
} __packed;
static void pn533_acr122_tx_frame_init(void *_frame, u8 cmd_code)
{
struct pn533_acr122_tx_frame *frame = _frame;
frame->ccid.type = PN533_ACR122_PC_TO_RDR_ESCAPE;
/* sizeof(apdu_hdr) + sizeof(datalen) */
frame->ccid.datalen = sizeof(frame->apdu) + 1;
frame->ccid.slot = 0;
frame->ccid.seq = 0;
frame->ccid.params[0] = 0;
frame->ccid.params[1] = 0;
frame->ccid.params[2] = 0;
frame->data[0] = PN533_STD_FRAME_DIR_OUT;
frame->data[1] = cmd_code;
frame->datalen = 2; /* data[0] + data[1] */
frame->apdu.class = 0xFF;
frame->apdu.ins = 0;
frame->apdu.p1 = 0;
frame->apdu.p2 = 0;
}
static void pn533_acr122_tx_frame_finish(void *_frame)
{
struct pn533_acr122_tx_frame *frame = _frame;
frame->ccid.datalen += frame->datalen;
}
static void pn533_acr122_tx_update_payload_len(void *_frame, int len)
{
struct pn533_acr122_tx_frame *frame = _frame;
frame->datalen += len;
}
static bool pn533_acr122_is_rx_frame_valid(void *_frame, struct pn533 *dev)
{
struct pn533_acr122_rx_frame *frame = _frame;
if (frame->ccid.type != 0x83)
return false;
if (!frame->ccid.datalen)
return false;
if (frame->data[frame->ccid.datalen - 2] == 0x63)
return false;
return true;
}
static int pn533_acr122_rx_frame_size(void *frame)
{
struct pn533_acr122_rx_frame *f = frame;
/* f->ccid.datalen already includes tail length */
return sizeof(struct pn533_acr122_rx_frame) + f->ccid.datalen;
}
static u8 pn533_acr122_get_cmd_code(void *frame)
{
struct pn533_acr122_rx_frame *f = frame;
return PN533_FRAME_CMD(f);
}
static struct pn533_frame_ops pn533_acr122_frame_ops = {
.tx_frame_init = pn533_acr122_tx_frame_init,
.tx_frame_finish = pn533_acr122_tx_frame_finish,
.tx_update_payload_len = pn533_acr122_tx_update_payload_len,
.tx_header_len = PN533_ACR122_TX_FRAME_HEADER_LEN,
.tx_tail_len = PN533_ACR122_TX_FRAME_TAIL_LEN,
.rx_is_frame_valid = pn533_acr122_is_rx_frame_valid,
.rx_header_len = PN533_ACR122_RX_FRAME_HEADER_LEN,
.rx_tail_len = PN533_ACR122_RX_FRAME_TAIL_LEN,
.rx_frame_size = pn533_acr122_rx_frame_size,
.max_payload_len = PN533_ACR122_FRAME_MAX_PAYLOAD_LEN,
.get_cmd_code = pn533_acr122_get_cmd_code,
};
struct pn533_acr122_poweron_rdr_arg {
int rc;
struct completion done;
};
static void pn533_acr122_poweron_rdr_resp(struct urb *urb)
{
struct pn533_acr122_poweron_rdr_arg *arg = urb->context;
dev_dbg(&urb->dev->dev, "%s\n", __func__);
print_hex_dump_debug("ACR122 RX: ", DUMP_PREFIX_NONE, 16, 1,
urb->transfer_buffer, urb->transfer_buffer_length,
false);
arg->rc = urb->status;
complete(&arg->done);
}
static int pn533_acr122_poweron_rdr(struct pn533_usb_phy *phy)
{
/* Power on th reader (CCID cmd) */
u8 cmd[10] = {PN533_ACR122_PC_TO_RDR_ICCPOWERON,
0, 0, 0, 0, 0, 0, 3, 0, 0};
int rc;
void *cntx;
struct pn533_acr122_poweron_rdr_arg arg;
dev_dbg(&phy->udev->dev, "%s\n", __func__);
init_completion(&arg.done);
cntx = phy->in_urb->context; /* backup context */
phy->in_urb->complete = pn533_acr122_poweron_rdr_resp;
phy->in_urb->context = &arg;
phy->out_urb->transfer_buffer = cmd;
phy->out_urb->transfer_buffer_length = sizeof(cmd);
print_hex_dump_debug("ACR122 TX: ", DUMP_PREFIX_NONE, 16, 1,
cmd, sizeof(cmd), false);
rc = usb_submit_urb(phy->out_urb, GFP_KERNEL);
if (rc) {
nfc_err(&phy->udev->dev,
"Reader power on cmd error %d\n", rc);
return rc;
}
rc = usb_submit_urb(phy->in_urb, GFP_KERNEL);
if (rc) {
nfc_err(&phy->udev->dev,
"Can't submit reader poweron cmd response %d\n", rc);
return rc;
}
wait_for_completion(&arg.done);
phy->in_urb->context = cntx; /* restore context */
return arg.rc;
}
static void pn533_send_complete(struct urb *urb)
{
struct pn533_usb_phy *phy = urb->context;
switch (urb->status) {
case 0:
break; /* success */
case -ECONNRESET:
case -ENOENT:
dev_dbg(&phy->udev->dev,
"The urb has been stopped (status %d)\n",
urb->status);
break;
case -ESHUTDOWN:
default:
nfc_err(&phy->udev->dev,
"Urb failure (status %d)\n",
urb->status);
}
}
static struct pn533_phy_ops usb_phy_ops = {
.send_frame = pn533_usb_send_frame,
.send_ack = pn533_usb_send_ack,
.abort_cmd = pn533_usb_abort_cmd,
};
static int pn533_usb_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct pn533 *priv;
struct pn533_usb_phy *phy;
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor *endpoint;
int in_endpoint = 0;
int out_endpoint = 0;
int rc = -ENOMEM;
int i;
u32 protocols;
enum pn533_protocol_type protocol_type = PN533_PROTO_REQ_ACK_RESP;
struct pn533_frame_ops *fops = NULL;
unsigned char *in_buf;
int in_buf_len = PN533_EXT_FRAME_HEADER_LEN +
PN533_STD_FRAME_MAX_PAYLOAD_LEN +
PN533_STD_FRAME_TAIL_LEN;
phy = devm_kzalloc(&interface->dev, sizeof(*phy), GFP_KERNEL);
if (!phy)
return -ENOMEM;
in_buf = kzalloc(in_buf_len, GFP_KERNEL);
if (!in_buf)
return -ENOMEM;
phy->udev = usb_get_dev(interface_to_usbdev(interface));
phy->interface = interface;
iface_desc = interface->cur_altsetting;
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint))
in_endpoint = endpoint->bEndpointAddress;
if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint))
out_endpoint = endpoint->bEndpointAddress;
}
if (!in_endpoint || !out_endpoint) {
nfc_err(&interface->dev,
"Could not find bulk-in or bulk-out endpoint\n");
rc = -ENODEV;
goto error;
}
phy->in_urb = usb_alloc_urb(0, GFP_KERNEL);
phy->out_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!phy->in_urb || !phy->out_urb)
goto error;
usb_fill_bulk_urb(phy->in_urb, phy->udev,
usb_rcvbulkpipe(phy->udev, in_endpoint),
in_buf, in_buf_len, NULL, phy);
usb_fill_bulk_urb(phy->out_urb, phy->udev,
usb_sndbulkpipe(phy->udev, out_endpoint),
NULL, 0, pn533_send_complete, phy);
switch (id->driver_info) {
case PN533_DEVICE_STD:
protocols = PN533_ALL_PROTOCOLS;
break;
case PN533_DEVICE_PASORI:
protocols = PN533_NO_TYPE_B_PROTOCOLS;
break;
case PN533_DEVICE_ACR122U:
protocols = PN533_NO_TYPE_B_PROTOCOLS;
fops = &pn533_acr122_frame_ops;
protocol_type = PN533_PROTO_REQ_RESP,
rc = pn533_acr122_poweron_rdr(phy);
if (rc < 0) {
nfc_err(&interface->dev,
"Couldn't poweron the reader (error %d)\n", rc);
goto error;
}
break;
default:
nfc_err(&interface->dev, "Unknown device type %lu\n",
id->driver_info);
rc = -EINVAL;
goto error;
}
priv = pn533_register_device(id->driver_info, protocols, protocol_type,
phy, &usb_phy_ops, fops,
&phy->udev->dev, &interface->dev);
if (IS_ERR(priv)) {
rc = PTR_ERR(priv);
goto error;
}
phy->priv = priv;
rc = pn533_finalize_setup(priv);
if (rc)
goto error;
usb_set_intfdata(interface, phy);
return 0;
error:
usb_free_urb(phy->in_urb);
usb_free_urb(phy->out_urb);
usb_put_dev(phy->udev);
kfree(in_buf);
return rc;
}
static void pn533_usb_disconnect(struct usb_interface *interface)
{
struct pn533_usb_phy *phy = usb_get_intfdata(interface);
if (!phy)
return;
pn533_unregister_device(phy->priv);
usb_set_intfdata(interface, NULL);
usb_kill_urb(phy->in_urb);
usb_kill_urb(phy->out_urb);
kfree(phy->in_urb->transfer_buffer);
usb_free_urb(phy->in_urb);
usb_free_urb(phy->out_urb);
nfc_info(&interface->dev, "NXP PN533 NFC device disconnected\n");
}
static struct usb_driver pn533_usb_driver = {
.name = "pn533_usb",
.probe = pn533_usb_probe,
.disconnect = pn533_usb_disconnect,
.id_table = pn533_usb_table,
};
module_usb_driver(pn533_usb_driver);
MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
MODULE_DESCRIPTION("PN533 USB driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");
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