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linuxdebug/drivers/nfc/pn544/pn544.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0-only
/*
* HCI based Driver for NXP PN544 NFC Chip
*
* Copyright (C) 2012 Intel Corporation. All rights reserved.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/nfc.h>
#include <net/nfc/hci.h>
#include "pn544.h"
/* Timing restrictions (ms) */
#define PN544_HCI_RESETVEN_TIME 30
enum pn544_state {
PN544_ST_COLD,
PN544_ST_FW_READY,
PN544_ST_READY,
};
#define FULL_VERSION_LEN 11
/* Proprietary commands */
#define PN544_WRITE 0x3f
#define PN544_TEST_SWP 0x21
/* Proprietary gates, events, commands and registers */
/* NFC_HCI_RF_READER_A_GATE additional registers and commands */
#define PN544_RF_READER_A_AUTO_ACTIVATION 0x10
#define PN544_RF_READER_A_CMD_CONTINUE_ACTIVATION 0x12
#define PN544_MIFARE_CMD 0x21
/* Commands that apply to all RF readers */
#define PN544_RF_READER_CMD_PRESENCE_CHECK 0x30
#define PN544_RF_READER_CMD_ACTIVATE_NEXT 0x32
/* NFC_HCI_ID_MGMT_GATE additional registers */
#define PN544_ID_MGMT_FULL_VERSION_SW 0x10
#define PN544_RF_READER_ISO15693_GATE 0x12
#define PN544_RF_READER_F_GATE 0x14
#define PN544_FELICA_ID 0x04
#define PN544_FELICA_RAW 0x20
#define PN544_RF_READER_JEWEL_GATE 0x15
#define PN544_JEWEL_RAW_CMD 0x23
#define PN544_RF_READER_NFCIP1_INITIATOR_GATE 0x30
#define PN544_RF_READER_NFCIP1_TARGET_GATE 0x31
#define PN544_SYS_MGMT_GATE 0x90
#define PN544_SYS_MGMT_INFO_NOTIFICATION 0x02
#define PN544_POLLING_LOOP_MGMT_GATE 0x94
#define PN544_DEP_MODE 0x01
#define PN544_DEP_ATR_REQ 0x02
#define PN544_DEP_ATR_RES 0x03
#define PN544_DEP_MERGE 0x0D
#define PN544_PL_RDPHASES 0x06
#define PN544_PL_EMULATION 0x07
#define PN544_PL_NFCT_DEACTIVATED 0x09
#define PN544_SWP_MGMT_GATE 0xA0
#define PN544_SWP_DEFAULT_MODE 0x01
#define PN544_NFC_WI_MGMT_GATE 0xA1
#define PN544_NFC_ESE_DEFAULT_MODE 0x01
#define PN544_HCI_EVT_SND_DATA 0x01
#define PN544_HCI_EVT_ACTIVATED 0x02
#define PN544_HCI_EVT_DEACTIVATED 0x03
#define PN544_HCI_EVT_RCV_DATA 0x04
#define PN544_HCI_EVT_CONTINUE_MI 0x05
#define PN544_HCI_EVT_SWITCH_MODE 0x03
#define PN544_HCI_CMD_ATTREQUEST 0x12
#define PN544_HCI_CMD_CONTINUE_ACTIVATION 0x13
static const struct nfc_hci_gate pn544_gates[] = {
{NFC_HCI_ADMIN_GATE, NFC_HCI_INVALID_PIPE},
{NFC_HCI_LOOPBACK_GATE, NFC_HCI_INVALID_PIPE},
{NFC_HCI_ID_MGMT_GATE, NFC_HCI_INVALID_PIPE},
{NFC_HCI_LINK_MGMT_GATE, NFC_HCI_INVALID_PIPE},
{NFC_HCI_RF_READER_B_GATE, NFC_HCI_INVALID_PIPE},
{NFC_HCI_RF_READER_A_GATE, NFC_HCI_INVALID_PIPE},
{PN544_SYS_MGMT_GATE, NFC_HCI_INVALID_PIPE},
{PN544_SWP_MGMT_GATE, NFC_HCI_INVALID_PIPE},
{PN544_POLLING_LOOP_MGMT_GATE, NFC_HCI_INVALID_PIPE},
{PN544_NFC_WI_MGMT_GATE, NFC_HCI_INVALID_PIPE},
{PN544_RF_READER_F_GATE, NFC_HCI_INVALID_PIPE},
{PN544_RF_READER_JEWEL_GATE, NFC_HCI_INVALID_PIPE},
{PN544_RF_READER_ISO15693_GATE, NFC_HCI_INVALID_PIPE},
{PN544_RF_READER_NFCIP1_INITIATOR_GATE, NFC_HCI_INVALID_PIPE},
{PN544_RF_READER_NFCIP1_TARGET_GATE, NFC_HCI_INVALID_PIPE}
};
/* Largest headroom needed for outgoing custom commands */
#define PN544_CMDS_HEADROOM 2
struct pn544_hci_info {
const struct nfc_phy_ops *phy_ops;
void *phy_id;
struct nfc_hci_dev *hdev;
enum pn544_state state;
struct mutex info_lock;
int async_cb_type;
data_exchange_cb_t async_cb;
void *async_cb_context;
fw_download_t fw_download;
};
static int pn544_hci_open(struct nfc_hci_dev *hdev)
{
struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
int r = 0;
mutex_lock(&info->info_lock);
if (info->state != PN544_ST_COLD) {
r = -EBUSY;
goto out;
}
r = info->phy_ops->enable(info->phy_id);
if (r == 0)
info->state = PN544_ST_READY;
out:
mutex_unlock(&info->info_lock);
return r;
}
static void pn544_hci_close(struct nfc_hci_dev *hdev)
{
struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
mutex_lock(&info->info_lock);
if (info->state == PN544_ST_COLD)
goto out;
info->phy_ops->disable(info->phy_id);
info->state = PN544_ST_COLD;
out:
mutex_unlock(&info->info_lock);
}
static int pn544_hci_ready(struct nfc_hci_dev *hdev)
{
struct sk_buff *skb;
static struct hw_config {
u8 adr[2];
u8 value;
} hw_config[] = {
{{0x9f, 0x9a}, 0x00},
{{0x98, 0x10}, 0xbc},
{{0x9e, 0x71}, 0x00},
{{0x98, 0x09}, 0x00},
{{0x9e, 0xb4}, 0x00},
{{0x9c, 0x01}, 0x08},
{{0x9e, 0xaa}, 0x01},
{{0x9b, 0xd1}, 0x17},
{{0x9b, 0xd2}, 0x58},
{{0x9b, 0xd3}, 0x10},
{{0x9b, 0xd4}, 0x47},
{{0x9b, 0xd5}, 0x0c},
{{0x9b, 0xd6}, 0x37},
{{0x9b, 0xdd}, 0x33},
{{0x9b, 0x84}, 0x00},
{{0x99, 0x81}, 0x79},
{{0x99, 0x31}, 0x79},
{{0x98, 0x00}, 0x3f},
{{0x9f, 0x09}, 0x02},
{{0x9f, 0x0a}, 0x05},
{{0x9e, 0xd1}, 0xa1},
{{0x99, 0x23}, 0x01},
{{0x9e, 0x74}, 0x00},
{{0x9e, 0x90}, 0x00},
{{0x9f, 0x28}, 0x10},
{{0x9f, 0x35}, 0x04},
{{0x9f, 0x36}, 0x11},
{{0x9c, 0x31}, 0x00},
{{0x9c, 0x32}, 0x00},
{{0x9c, 0x19}, 0x0a},
{{0x9c, 0x1a}, 0x0a},
{{0x9c, 0x0c}, 0x00},
{{0x9c, 0x0d}, 0x00},
{{0x9c, 0x12}, 0x00},
{{0x9c, 0x13}, 0x00},
{{0x98, 0xa2}, 0x09},
{{0x98, 0x93}, 0x00},
{{0x98, 0x7d}, 0x08},
{{0x98, 0x7e}, 0x00},
{{0x9f, 0xc8}, 0x00},
};
struct hw_config *p = hw_config;
int count = ARRAY_SIZE(hw_config);
struct sk_buff *res_skb;
u8 param[4];
int r;
param[0] = 0;
while (count--) {
param[1] = p->adr[0];
param[2] = p->adr[1];
param[3] = p->value;
r = nfc_hci_send_cmd(hdev, PN544_SYS_MGMT_GATE, PN544_WRITE,
param, 4, &res_skb);
if (r < 0)
return r;
if (res_skb->len != 1) {
kfree_skb(res_skb);
return -EPROTO;
}
if (res_skb->data[0] != p->value) {
kfree_skb(res_skb);
return -EIO;
}
kfree_skb(res_skb);
p++;
}
param[0] = NFC_HCI_UICC_HOST_ID;
r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
NFC_HCI_ADMIN_WHITELIST, param, 1);
if (r < 0)
return r;
param[0] = 0x3d;
r = nfc_hci_set_param(hdev, PN544_SYS_MGMT_GATE,
PN544_SYS_MGMT_INFO_NOTIFICATION, param, 1);
if (r < 0)
return r;
param[0] = 0x0;
r = nfc_hci_set_param(hdev, NFC_HCI_RF_READER_A_GATE,
PN544_RF_READER_A_AUTO_ACTIVATION, param, 1);
if (r < 0)
return r;
r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
NFC_HCI_EVT_END_OPERATION, NULL, 0);
if (r < 0)
return r;
param[0] = 0x1;
r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
PN544_PL_NFCT_DEACTIVATED, param, 1);
if (r < 0)
return r;
param[0] = 0x0;
r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
PN544_PL_RDPHASES, param, 1);
if (r < 0)
return r;
r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
PN544_ID_MGMT_FULL_VERSION_SW, &skb);
if (r < 0)
return r;
if (skb->len != FULL_VERSION_LEN) {
kfree_skb(skb);
return -EINVAL;
}
print_hex_dump(KERN_DEBUG, "FULL VERSION SOFTWARE INFO: ",
DUMP_PREFIX_NONE, 16, 1,
skb->data, FULL_VERSION_LEN, false);
kfree_skb(skb);
return 0;
}
static int pn544_hci_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb)
{
struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
return info->phy_ops->write(info->phy_id, skb);
}
static int pn544_hci_start_poll(struct nfc_hci_dev *hdev,
u32 im_protocols, u32 tm_protocols)
{
u8 phases = 0;
int r;
u8 duration[2];
u8 activated;
u8 i_mode = 0x3f; /* Enable all supported modes */
u8 t_mode = 0x0f;
u8 t_merge = 0x01; /* Enable merge by default */
pr_info(DRIVER_DESC ": %s protocols 0x%x 0x%x\n",
__func__, im_protocols, tm_protocols);
r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
NFC_HCI_EVT_END_OPERATION, NULL, 0);
if (r < 0)
return r;
duration[0] = 0x18;
duration[1] = 0x6a;
r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
PN544_PL_EMULATION, duration, 2);
if (r < 0)
return r;
activated = 0;
r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
PN544_PL_NFCT_DEACTIVATED, &activated, 1);
if (r < 0)
return r;
if (im_protocols & (NFC_PROTO_ISO14443_MASK | NFC_PROTO_MIFARE_MASK |
NFC_PROTO_JEWEL_MASK))
phases |= 1; /* Type A */
if (im_protocols & NFC_PROTO_FELICA_MASK) {
phases |= (1 << 2); /* Type F 212 */
phases |= (1 << 3); /* Type F 424 */
}
phases |= (1 << 5); /* NFC active */
r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
PN544_PL_RDPHASES, &phases, 1);
if (r < 0)
return r;
if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
hdev->gb = nfc_get_local_general_bytes(hdev->ndev,
&hdev->gb_len);
pr_debug("generate local bytes %p\n", hdev->gb);
if (hdev->gb == NULL || hdev->gb_len == 0) {
im_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
tm_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
}
}
if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
r = nfc_hci_send_event(hdev,
PN544_RF_READER_NFCIP1_INITIATOR_GATE,
NFC_HCI_EVT_END_OPERATION, NULL, 0);
if (r < 0)
return r;
r = nfc_hci_set_param(hdev,
PN544_RF_READER_NFCIP1_INITIATOR_GATE,
PN544_DEP_MODE, &i_mode, 1);
if (r < 0)
return r;
r = nfc_hci_set_param(hdev,
PN544_RF_READER_NFCIP1_INITIATOR_GATE,
PN544_DEP_ATR_REQ, hdev->gb, hdev->gb_len);
if (r < 0)
return r;
r = nfc_hci_send_event(hdev,
PN544_RF_READER_NFCIP1_INITIATOR_GATE,
NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
if (r < 0)
nfc_hci_send_event(hdev,
PN544_RF_READER_NFCIP1_INITIATOR_GATE,
NFC_HCI_EVT_END_OPERATION, NULL, 0);
}
if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
r = nfc_hci_set_param(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
PN544_DEP_MODE, &t_mode, 1);
if (r < 0)
return r;
r = nfc_hci_set_param(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
PN544_DEP_ATR_RES, hdev->gb, hdev->gb_len);
if (r < 0)
return r;
r = nfc_hci_set_param(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
PN544_DEP_MERGE, &t_merge, 1);
if (r < 0)
return r;
}
r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
if (r < 0)
nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
NFC_HCI_EVT_END_OPERATION, NULL, 0);
return r;
}
static int pn544_hci_dep_link_up(struct nfc_hci_dev *hdev,
struct nfc_target *target, u8 comm_mode,
u8 *gb, size_t gb_len)
{
struct sk_buff *rgb_skb = NULL;
int r;
r = nfc_hci_get_param(hdev, target->hci_reader_gate,
PN544_DEP_ATR_RES, &rgb_skb);
if (r < 0)
return r;
if (rgb_skb->len == 0 || rgb_skb->len > NFC_GB_MAXSIZE) {
r = -EPROTO;
goto exit;
}
print_hex_dump(KERN_DEBUG, "remote gb: ", DUMP_PREFIX_OFFSET,
16, 1, rgb_skb->data, rgb_skb->len, true);
r = nfc_set_remote_general_bytes(hdev->ndev, rgb_skb->data,
rgb_skb->len);
if (r == 0)
r = nfc_dep_link_is_up(hdev->ndev, target->idx, comm_mode,
NFC_RF_INITIATOR);
exit:
kfree_skb(rgb_skb);
return r;
}
static int pn544_hci_dep_link_down(struct nfc_hci_dev *hdev)
{
return nfc_hci_send_event(hdev, PN544_RF_READER_NFCIP1_INITIATOR_GATE,
NFC_HCI_EVT_END_OPERATION, NULL, 0);
}
static int pn544_hci_target_from_gate(struct nfc_hci_dev *hdev, u8 gate,
struct nfc_target *target)
{
switch (gate) {
case PN544_RF_READER_F_GATE:
target->supported_protocols = NFC_PROTO_FELICA_MASK;
break;
case PN544_RF_READER_JEWEL_GATE:
target->supported_protocols = NFC_PROTO_JEWEL_MASK;
target->sens_res = 0x0c00;
break;
case PN544_RF_READER_NFCIP1_INITIATOR_GATE:
target->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
break;
default:
return -EPROTO;
}
return 0;
}
static int pn544_hci_complete_target_discovered(struct nfc_hci_dev *hdev,
u8 gate,
struct nfc_target *target)
{
struct sk_buff *uid_skb;
int r = 0;
if (gate == PN544_RF_READER_NFCIP1_INITIATOR_GATE)
return r;
if (target->supported_protocols & NFC_PROTO_NFC_DEP_MASK) {
r = nfc_hci_send_cmd(hdev,
PN544_RF_READER_NFCIP1_INITIATOR_GATE,
PN544_HCI_CMD_CONTINUE_ACTIVATION, NULL, 0, NULL);
if (r < 0)
return r;
target->hci_reader_gate = PN544_RF_READER_NFCIP1_INITIATOR_GATE;
} else if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
if (target->nfcid1_len != 4 && target->nfcid1_len != 7 &&
target->nfcid1_len != 10)
return -EPROTO;
r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
PN544_RF_READER_CMD_ACTIVATE_NEXT,
target->nfcid1, target->nfcid1_len, NULL);
} else if (target->supported_protocols & NFC_PROTO_FELICA_MASK) {
r = nfc_hci_get_param(hdev, PN544_RF_READER_F_GATE,
PN544_FELICA_ID, &uid_skb);
if (r < 0)
return r;
if (uid_skb->len != 8) {
kfree_skb(uid_skb);
return -EPROTO;
}
/* Type F NFC-DEP IDm has prefix 0x01FE */
if ((uid_skb->data[0] == 0x01) && (uid_skb->data[1] == 0xfe)) {
kfree_skb(uid_skb);
r = nfc_hci_send_cmd(hdev,
PN544_RF_READER_NFCIP1_INITIATOR_GATE,
PN544_HCI_CMD_CONTINUE_ACTIVATION,
NULL, 0, NULL);
if (r < 0)
return r;
target->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
target->hci_reader_gate =
PN544_RF_READER_NFCIP1_INITIATOR_GATE;
} else {
r = nfc_hci_send_cmd(hdev, PN544_RF_READER_F_GATE,
PN544_RF_READER_CMD_ACTIVATE_NEXT,
uid_skb->data, uid_skb->len, NULL);
kfree_skb(uid_skb);
}
} else if (target->supported_protocols & NFC_PROTO_ISO14443_MASK) {
/*
* TODO: maybe other ISO 14443 require some kind of continue
* activation, but for now we've seen only this one below.
*/
if (target->sens_res == 0x4403) /* Type 4 Mifare DESFire */
r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
PN544_RF_READER_A_CMD_CONTINUE_ACTIVATION,
NULL, 0, NULL);
}
return r;
}
#define PN544_CB_TYPE_READER_F 1
static void pn544_hci_data_exchange_cb(void *context, struct sk_buff *skb,
int err)
{
struct pn544_hci_info *info = context;
switch (info->async_cb_type) {
case PN544_CB_TYPE_READER_F:
if (err == 0)
skb_pull(skb, 1);
info->async_cb(info->async_cb_context, skb, err);
break;
default:
if (err == 0)
kfree_skb(skb);
break;
}
}
#define MIFARE_CMD_AUTH_KEY_A 0x60
#define MIFARE_CMD_AUTH_KEY_B 0x61
#define MIFARE_CMD_HEADER 2
#define MIFARE_UID_LEN 4
#define MIFARE_KEY_LEN 6
#define MIFARE_CMD_LEN 12
/*
* Returns:
* <= 0: driver handled the data exchange
* 1: driver doesn't especially handle, please do standard processing
*/
static int pn544_hci_im_transceive(struct nfc_hci_dev *hdev,
struct nfc_target *target,
struct sk_buff *skb, data_exchange_cb_t cb,
void *cb_context)
{
struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
pr_info(DRIVER_DESC ": %s for gate=%d\n", __func__,
target->hci_reader_gate);
switch (target->hci_reader_gate) {
case NFC_HCI_RF_READER_A_GATE:
if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
/*
* It seems that pn544 is inverting key and UID for
* MIFARE authentication commands.
*/
if (skb->len == MIFARE_CMD_LEN &&
(skb->data[0] == MIFARE_CMD_AUTH_KEY_A ||
skb->data[0] == MIFARE_CMD_AUTH_KEY_B)) {
u8 uid[MIFARE_UID_LEN];
u8 *data = skb->data + MIFARE_CMD_HEADER;
memcpy(uid, data + MIFARE_KEY_LEN,
MIFARE_UID_LEN);
memmove(data + MIFARE_UID_LEN, data,
MIFARE_KEY_LEN);
memcpy(data, uid, MIFARE_UID_LEN);
}
return nfc_hci_send_cmd_async(hdev,
target->hci_reader_gate,
PN544_MIFARE_CMD,
skb->data, skb->len,
cb, cb_context);
} else
return 1;
case PN544_RF_READER_F_GATE:
*(u8 *)skb_push(skb, 1) = 0;
*(u8 *)skb_push(skb, 1) = 0;
info->async_cb_type = PN544_CB_TYPE_READER_F;
info->async_cb = cb;
info->async_cb_context = cb_context;
return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
PN544_FELICA_RAW, skb->data,
skb->len,
pn544_hci_data_exchange_cb, info);
case PN544_RF_READER_JEWEL_GATE:
return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
PN544_JEWEL_RAW_CMD, skb->data,
skb->len, cb, cb_context);
case PN544_RF_READER_NFCIP1_INITIATOR_GATE:
*(u8 *)skb_push(skb, 1) = 0;
return nfc_hci_send_event(hdev, target->hci_reader_gate,
PN544_HCI_EVT_SND_DATA, skb->data,
skb->len);
default:
return 1;
}
}
static int pn544_hci_tm_send(struct nfc_hci_dev *hdev, struct sk_buff *skb)
{
int r;
/* Set default false for multiple information chaining */
*(u8 *)skb_push(skb, 1) = 0;
r = nfc_hci_send_event(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
PN544_HCI_EVT_SND_DATA, skb->data, skb->len);
kfree_skb(skb);
return r;
}
static int pn544_hci_check_presence(struct nfc_hci_dev *hdev,
struct nfc_target *target)
{
pr_debug("supported protocol %d\n", target->supported_protocols);
if (target->supported_protocols & (NFC_PROTO_ISO14443_MASK |
NFC_PROTO_ISO14443_B_MASK)) {
return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
PN544_RF_READER_CMD_PRESENCE_CHECK,
NULL, 0, NULL);
} else if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
if (target->nfcid1_len != 4 && target->nfcid1_len != 7 &&
target->nfcid1_len != 10)
return -EOPNOTSUPP;
return nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
PN544_RF_READER_CMD_ACTIVATE_NEXT,
target->nfcid1, target->nfcid1_len, NULL);
} else if (target->supported_protocols & (NFC_PROTO_JEWEL_MASK |
NFC_PROTO_FELICA_MASK)) {
return -EOPNOTSUPP;
} else if (target->supported_protocols & NFC_PROTO_NFC_DEP_MASK) {
return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
PN544_HCI_CMD_ATTREQUEST,
NULL, 0, NULL);
}
return 0;
}
/*
* Returns:
* <= 0: driver handled the event, skb consumed
* 1: driver does not handle the event, please do standard processing
*/
static int pn544_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
struct sk_buff *skb)
{
struct sk_buff *rgb_skb = NULL;
u8 gate = hdev->pipes[pipe].gate;
int r;
pr_debug("hci event %d\n", event);
switch (event) {
case PN544_HCI_EVT_ACTIVATED:
if (gate == PN544_RF_READER_NFCIP1_INITIATOR_GATE) {
r = nfc_hci_target_discovered(hdev, gate);
} else if (gate == PN544_RF_READER_NFCIP1_TARGET_GATE) {
r = nfc_hci_get_param(hdev, gate, PN544_DEP_ATR_REQ,
&rgb_skb);
if (r < 0)
goto exit;
r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
NFC_COMM_PASSIVE, rgb_skb->data,
rgb_skb->len);
kfree_skb(rgb_skb);
} else {
r = -EINVAL;
}
break;
case PN544_HCI_EVT_DEACTIVATED:
r = nfc_hci_send_event(hdev, gate, NFC_HCI_EVT_END_OPERATION,
NULL, 0);
break;
case PN544_HCI_EVT_RCV_DATA:
if (skb->len < 2) {
r = -EPROTO;
goto exit;
}
if (skb->data[0] != 0) {
pr_debug("data0 %d\n", skb->data[0]);
r = -EPROTO;
goto exit;
}
skb_pull(skb, 2);
return nfc_tm_data_received(hdev->ndev, skb);
default:
return 1;
}
exit:
kfree_skb(skb);
return r;
}
static int pn544_hci_fw_download(struct nfc_hci_dev *hdev,
const char *firmware_name)
{
struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
if (info->fw_download == NULL)
return -ENOTSUPP;
return info->fw_download(info->phy_id, firmware_name, hdev->sw_romlib);
}
static int pn544_hci_discover_se(struct nfc_hci_dev *hdev)
{
u32 se_idx = 0;
u8 ese_mode = 0x01; /* Default mode */
struct sk_buff *res_skb;
int r;
r = nfc_hci_send_cmd(hdev, PN544_SYS_MGMT_GATE, PN544_TEST_SWP,
NULL, 0, &res_skb);
if (r == 0) {
if (res_skb->len == 2 && res_skb->data[0] == 0x00)
nfc_add_se(hdev->ndev, se_idx++, NFC_SE_UICC);
kfree_skb(res_skb);
}
r = nfc_hci_send_event(hdev, PN544_NFC_WI_MGMT_GATE,
PN544_HCI_EVT_SWITCH_MODE,
&ese_mode, 1);
if (r == 0)
nfc_add_se(hdev->ndev, se_idx++, NFC_SE_EMBEDDED);
return !se_idx;
}
#define PN544_SE_MODE_OFF 0x00
#define PN544_SE_MODE_ON 0x01
static int pn544_hci_enable_se(struct nfc_hci_dev *hdev, u32 se_idx)
{
const struct nfc_se *se;
u8 enable = PN544_SE_MODE_ON;
static struct uicc_gatelist {
u8 head;
u8 adr[2];
u8 value;
} uicc_gatelist[] = {
{0x00, {0x9e, 0xd9}, 0x23},
{0x00, {0x9e, 0xda}, 0x21},
{0x00, {0x9e, 0xdb}, 0x22},
{0x00, {0x9e, 0xdc}, 0x24},
};
struct uicc_gatelist *p = uicc_gatelist;
int count = ARRAY_SIZE(uicc_gatelist);
struct sk_buff *res_skb;
int r;
se = nfc_find_se(hdev->ndev, se_idx);
switch (se->type) {
case NFC_SE_UICC:
while (count--) {
r = nfc_hci_send_cmd(hdev, PN544_SYS_MGMT_GATE,
PN544_WRITE, (u8 *)p, 4, &res_skb);
if (r < 0)
return r;
if (res_skb->len != 1) {
kfree_skb(res_skb);
return -EPROTO;
}
if (res_skb->data[0] != p->value) {
kfree_skb(res_skb);
return -EIO;
}
kfree_skb(res_skb);
p++;
}
return nfc_hci_set_param(hdev, PN544_SWP_MGMT_GATE,
PN544_SWP_DEFAULT_MODE, &enable, 1);
case NFC_SE_EMBEDDED:
return nfc_hci_set_param(hdev, PN544_NFC_WI_MGMT_GATE,
PN544_NFC_ESE_DEFAULT_MODE, &enable, 1);
default:
return -EINVAL;
}
}
static int pn544_hci_disable_se(struct nfc_hci_dev *hdev, u32 se_idx)
{
const struct nfc_se *se;
u8 disable = PN544_SE_MODE_OFF;
se = nfc_find_se(hdev->ndev, se_idx);
switch (se->type) {
case NFC_SE_UICC:
return nfc_hci_set_param(hdev, PN544_SWP_MGMT_GATE,
PN544_SWP_DEFAULT_MODE, &disable, 1);
case NFC_SE_EMBEDDED:
return nfc_hci_set_param(hdev, PN544_NFC_WI_MGMT_GATE,
PN544_NFC_ESE_DEFAULT_MODE, &disable, 1);
default:
return -EINVAL;
}
}
static const struct nfc_hci_ops pn544_hci_ops = {
.open = pn544_hci_open,
.close = pn544_hci_close,
.hci_ready = pn544_hci_ready,
.xmit = pn544_hci_xmit,
.start_poll = pn544_hci_start_poll,
.dep_link_up = pn544_hci_dep_link_up,
.dep_link_down = pn544_hci_dep_link_down,
.target_from_gate = pn544_hci_target_from_gate,
.complete_target_discovered = pn544_hci_complete_target_discovered,
.im_transceive = pn544_hci_im_transceive,
.tm_send = pn544_hci_tm_send,
.check_presence = pn544_hci_check_presence,
.event_received = pn544_hci_event_received,
.fw_download = pn544_hci_fw_download,
.discover_se = pn544_hci_discover_se,
.enable_se = pn544_hci_enable_se,
.disable_se = pn544_hci_disable_se,
};
int pn544_hci_probe(void *phy_id, const struct nfc_phy_ops *phy_ops,
char *llc_name, int phy_headroom, int phy_tailroom,
int phy_payload, fw_download_t fw_download,
struct nfc_hci_dev **hdev)
{
struct pn544_hci_info *info;
u32 protocols;
struct nfc_hci_init_data init_data;
int r;
info = kzalloc(sizeof(struct pn544_hci_info), GFP_KERNEL);
if (!info) {
r = -ENOMEM;
goto err_info_alloc;
}
info->phy_ops = phy_ops;
info->phy_id = phy_id;
info->fw_download = fw_download;
info->state = PN544_ST_COLD;
mutex_init(&info->info_lock);
init_data.gate_count = ARRAY_SIZE(pn544_gates);
memcpy(init_data.gates, pn544_gates, sizeof(pn544_gates));
/*
* TODO: Session id must include the driver name + some bus addr
* persistent info to discriminate 2 identical chips
*/
strcpy(init_data.session_id, "ID544HCI");
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;
info->hdev = nfc_hci_allocate_device(&pn544_hci_ops, &init_data, 0,
protocols, llc_name,
phy_headroom + PN544_CMDS_HEADROOM,
phy_tailroom, phy_payload);
if (!info->hdev) {
pr_err("Cannot allocate nfc hdev\n");
r = -ENOMEM;
goto err_alloc_hdev;
}
nfc_hci_set_clientdata(info->hdev, info);
r = nfc_hci_register_device(info->hdev);
if (r)
goto err_regdev;
*hdev = info->hdev;
return 0;
err_regdev:
nfc_hci_free_device(info->hdev);
err_alloc_hdev:
kfree(info);
err_info_alloc:
return r;
}
EXPORT_SYMBOL(pn544_hci_probe);
void pn544_hci_remove(struct nfc_hci_dev *hdev)
{
struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
nfc_hci_unregister_device(hdev);
nfc_hci_free_device(hdev);
kfree(info);
}
EXPORT_SYMBOL(pn544_hci_remove);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(DRIVER_DESC);