forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
856 lines
20 KiB
856 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* NFC Digital Protocol stack |
|
* Copyright (c) 2013, Intel Corporation. |
|
*/ |
|
|
|
#define pr_fmt(fmt) "digital: %s: " fmt, __func__ |
|
|
|
#include <linux/module.h> |
|
|
|
#include "digital.h" |
|
|
|
#define DIGITAL_PROTO_NFCA_RF_TECH \ |
|
(NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | \ |
|
NFC_PROTO_NFC_DEP_MASK | NFC_PROTO_ISO14443_MASK) |
|
|
|
#define DIGITAL_PROTO_NFCB_RF_TECH NFC_PROTO_ISO14443_B_MASK |
|
|
|
#define DIGITAL_PROTO_NFCF_RF_TECH \ |
|
(NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK) |
|
|
|
#define DIGITAL_PROTO_ISO15693_RF_TECH NFC_PROTO_ISO15693_MASK |
|
|
|
/* Delay between each poll frame (ms) */ |
|
#define DIGITAL_POLL_INTERVAL 10 |
|
|
|
struct digital_cmd { |
|
struct list_head queue; |
|
|
|
u8 type; |
|
u8 pending; |
|
|
|
u16 timeout; |
|
struct sk_buff *req; |
|
struct sk_buff *resp; |
|
struct digital_tg_mdaa_params *mdaa_params; |
|
|
|
nfc_digital_cmd_complete_t cmd_cb; |
|
void *cb_context; |
|
}; |
|
|
|
struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev, |
|
unsigned int len) |
|
{ |
|
struct sk_buff *skb; |
|
|
|
skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom, |
|
GFP_KERNEL); |
|
if (skb) |
|
skb_reserve(skb, ddev->tx_headroom); |
|
|
|
return skb; |
|
} |
|
|
|
void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init, |
|
u8 bitwise_inv, u8 msb_first) |
|
{ |
|
u16 crc; |
|
|
|
crc = crc_func(init, skb->data, skb->len); |
|
|
|
if (bitwise_inv) |
|
crc = ~crc; |
|
|
|
if (msb_first) |
|
crc = __fswab16(crc); |
|
|
|
skb_put_u8(skb, crc & 0xFF); |
|
skb_put_u8(skb, (crc >> 8) & 0xFF); |
|
} |
|
|
|
int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func, |
|
u16 crc_init, u8 bitwise_inv, u8 msb_first) |
|
{ |
|
int rc; |
|
u16 crc; |
|
|
|
if (skb->len <= 2) |
|
return -EIO; |
|
|
|
crc = crc_func(crc_init, skb->data, skb->len - 2); |
|
|
|
if (bitwise_inv) |
|
crc = ~crc; |
|
|
|
if (msb_first) |
|
crc = __swab16(crc); |
|
|
|
rc = (skb->data[skb->len - 2] - (crc & 0xFF)) + |
|
(skb->data[skb->len - 1] - ((crc >> 8) & 0xFF)); |
|
|
|
if (rc) |
|
return -EIO; |
|
|
|
skb_trim(skb, skb->len - 2); |
|
|
|
return 0; |
|
} |
|
|
|
static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on) |
|
{ |
|
ddev->ops->switch_rf(ddev, on); |
|
} |
|
|
|
static inline void digital_abort_cmd(struct nfc_digital_dev *ddev) |
|
{ |
|
ddev->ops->abort_cmd(ddev); |
|
} |
|
|
|
static void digital_wq_cmd_complete(struct work_struct *work) |
|
{ |
|
struct digital_cmd *cmd; |
|
struct nfc_digital_dev *ddev = container_of(work, |
|
struct nfc_digital_dev, |
|
cmd_complete_work); |
|
|
|
mutex_lock(&ddev->cmd_lock); |
|
|
|
cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd, |
|
queue); |
|
if (!cmd) { |
|
mutex_unlock(&ddev->cmd_lock); |
|
return; |
|
} |
|
|
|
list_del(&cmd->queue); |
|
|
|
mutex_unlock(&ddev->cmd_lock); |
|
|
|
if (!IS_ERR(cmd->resp)) |
|
print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1, |
|
cmd->resp->data, cmd->resp->len, false); |
|
|
|
cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp); |
|
|
|
kfree(cmd->mdaa_params); |
|
kfree(cmd); |
|
|
|
schedule_work(&ddev->cmd_work); |
|
} |
|
|
|
static void digital_send_cmd_complete(struct nfc_digital_dev *ddev, |
|
void *arg, struct sk_buff *resp) |
|
{ |
|
struct digital_cmd *cmd = arg; |
|
|
|
cmd->resp = resp; |
|
|
|
schedule_work(&ddev->cmd_complete_work); |
|
} |
|
|
|
static void digital_wq_cmd(struct work_struct *work) |
|
{ |
|
int rc; |
|
struct digital_cmd *cmd; |
|
struct digital_tg_mdaa_params *params; |
|
struct nfc_digital_dev *ddev = container_of(work, |
|
struct nfc_digital_dev, |
|
cmd_work); |
|
|
|
mutex_lock(&ddev->cmd_lock); |
|
|
|
cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd, |
|
queue); |
|
if (!cmd || cmd->pending) { |
|
mutex_unlock(&ddev->cmd_lock); |
|
return; |
|
} |
|
|
|
cmd->pending = 1; |
|
|
|
mutex_unlock(&ddev->cmd_lock); |
|
|
|
if (cmd->req) |
|
print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1, |
|
cmd->req->data, cmd->req->len, false); |
|
|
|
switch (cmd->type) { |
|
case DIGITAL_CMD_IN_SEND: |
|
rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout, |
|
digital_send_cmd_complete, cmd); |
|
break; |
|
|
|
case DIGITAL_CMD_TG_SEND: |
|
rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout, |
|
digital_send_cmd_complete, cmd); |
|
break; |
|
|
|
case DIGITAL_CMD_TG_LISTEN: |
|
rc = ddev->ops->tg_listen(ddev, cmd->timeout, |
|
digital_send_cmd_complete, cmd); |
|
break; |
|
|
|
case DIGITAL_CMD_TG_LISTEN_MDAA: |
|
params = cmd->mdaa_params; |
|
|
|
rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout, |
|
digital_send_cmd_complete, cmd); |
|
break; |
|
|
|
case DIGITAL_CMD_TG_LISTEN_MD: |
|
rc = ddev->ops->tg_listen_md(ddev, cmd->timeout, |
|
digital_send_cmd_complete, cmd); |
|
break; |
|
|
|
default: |
|
pr_err("Unknown cmd type %d\n", cmd->type); |
|
return; |
|
} |
|
|
|
if (!rc) |
|
return; |
|
|
|
pr_err("in_send_command returned err %d\n", rc); |
|
|
|
mutex_lock(&ddev->cmd_lock); |
|
list_del(&cmd->queue); |
|
mutex_unlock(&ddev->cmd_lock); |
|
|
|
kfree_skb(cmd->req); |
|
kfree(cmd->mdaa_params); |
|
kfree(cmd); |
|
|
|
schedule_work(&ddev->cmd_work); |
|
} |
|
|
|
int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type, |
|
struct sk_buff *skb, struct digital_tg_mdaa_params *params, |
|
u16 timeout, nfc_digital_cmd_complete_t cmd_cb, |
|
void *cb_context) |
|
{ |
|
struct digital_cmd *cmd; |
|
|
|
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); |
|
if (!cmd) |
|
return -ENOMEM; |
|
|
|
cmd->type = cmd_type; |
|
cmd->timeout = timeout; |
|
cmd->req = skb; |
|
cmd->mdaa_params = params; |
|
cmd->cmd_cb = cmd_cb; |
|
cmd->cb_context = cb_context; |
|
INIT_LIST_HEAD(&cmd->queue); |
|
|
|
mutex_lock(&ddev->cmd_lock); |
|
list_add_tail(&cmd->queue, &ddev->cmd_queue); |
|
mutex_unlock(&ddev->cmd_lock); |
|
|
|
schedule_work(&ddev->cmd_work); |
|
|
|
return 0; |
|
} |
|
|
|
int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param) |
|
{ |
|
int rc; |
|
|
|
rc = ddev->ops->in_configure_hw(ddev, type, param); |
|
if (rc) |
|
pr_err("in_configure_hw failed: %d\n", rc); |
|
|
|
return rc; |
|
} |
|
|
|
int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param) |
|
{ |
|
int rc; |
|
|
|
rc = ddev->ops->tg_configure_hw(ddev, type, param); |
|
if (rc) |
|
pr_err("tg_configure_hw failed: %d\n", rc); |
|
|
|
return rc; |
|
} |
|
|
|
static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech) |
|
{ |
|
struct digital_tg_mdaa_params *params; |
|
|
|
params = kzalloc(sizeof(*params), GFP_KERNEL); |
|
if (!params) |
|
return -ENOMEM; |
|
|
|
params->sens_res = DIGITAL_SENS_RES_NFC_DEP; |
|
get_random_bytes(params->nfcid1, sizeof(params->nfcid1)); |
|
params->sel_res = DIGITAL_SEL_RES_NFC_DEP; |
|
|
|
params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1; |
|
params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2; |
|
get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2); |
|
params->sc = DIGITAL_SENSF_FELICA_SC; |
|
|
|
return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params, |
|
500, digital_tg_recv_atr_req, NULL); |
|
} |
|
|
|
static int digital_tg_listen_md(struct nfc_digital_dev *ddev, u8 rf_tech) |
|
{ |
|
return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MD, NULL, NULL, 500, |
|
digital_tg_recv_md_req, NULL); |
|
} |
|
|
|
int digital_target_found(struct nfc_digital_dev *ddev, |
|
struct nfc_target *target, u8 protocol) |
|
{ |
|
int rc; |
|
u8 framing; |
|
u8 rf_tech; |
|
u8 poll_tech_count; |
|
int (*check_crc)(struct sk_buff *skb); |
|
void (*add_crc)(struct sk_buff *skb); |
|
|
|
rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech; |
|
|
|
switch (protocol) { |
|
case NFC_PROTO_JEWEL: |
|
framing = NFC_DIGITAL_FRAMING_NFCA_T1T; |
|
check_crc = digital_skb_check_crc_b; |
|
add_crc = digital_skb_add_crc_b; |
|
break; |
|
|
|
case NFC_PROTO_MIFARE: |
|
framing = NFC_DIGITAL_FRAMING_NFCA_T2T; |
|
check_crc = digital_skb_check_crc_a; |
|
add_crc = digital_skb_add_crc_a; |
|
break; |
|
|
|
case NFC_PROTO_FELICA: |
|
framing = NFC_DIGITAL_FRAMING_NFCF_T3T; |
|
check_crc = digital_skb_check_crc_f; |
|
add_crc = digital_skb_add_crc_f; |
|
break; |
|
|
|
case NFC_PROTO_NFC_DEP: |
|
if (rf_tech == NFC_DIGITAL_RF_TECH_106A) { |
|
framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP; |
|
check_crc = digital_skb_check_crc_a; |
|
add_crc = digital_skb_add_crc_a; |
|
} else { |
|
framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP; |
|
check_crc = digital_skb_check_crc_f; |
|
add_crc = digital_skb_add_crc_f; |
|
} |
|
break; |
|
|
|
case NFC_PROTO_ISO15693: |
|
framing = NFC_DIGITAL_FRAMING_ISO15693_T5T; |
|
check_crc = digital_skb_check_crc_b; |
|
add_crc = digital_skb_add_crc_b; |
|
break; |
|
|
|
case NFC_PROTO_ISO14443: |
|
framing = NFC_DIGITAL_FRAMING_NFCA_T4T; |
|
check_crc = digital_skb_check_crc_a; |
|
add_crc = digital_skb_add_crc_a; |
|
break; |
|
|
|
case NFC_PROTO_ISO14443_B: |
|
framing = NFC_DIGITAL_FRAMING_NFCB_T4T; |
|
check_crc = digital_skb_check_crc_b; |
|
add_crc = digital_skb_add_crc_b; |
|
break; |
|
|
|
default: |
|
pr_err("Invalid protocol %d\n", protocol); |
|
return -EINVAL; |
|
} |
|
|
|
pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol); |
|
|
|
ddev->curr_rf_tech = rf_tech; |
|
|
|
if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) { |
|
ddev->skb_add_crc = digital_skb_add_crc_none; |
|
ddev->skb_check_crc = digital_skb_check_crc_none; |
|
} else { |
|
ddev->skb_add_crc = add_crc; |
|
ddev->skb_check_crc = check_crc; |
|
} |
|
|
|
rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing); |
|
if (rc) |
|
return rc; |
|
|
|
target->supported_protocols = (1 << protocol); |
|
|
|
poll_tech_count = ddev->poll_tech_count; |
|
ddev->poll_tech_count = 0; |
|
|
|
rc = nfc_targets_found(ddev->nfc_dev, target, 1); |
|
if (rc) { |
|
ddev->poll_tech_count = poll_tech_count; |
|
return rc; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
void digital_poll_next_tech(struct nfc_digital_dev *ddev) |
|
{ |
|
u8 rand_mod; |
|
|
|
digital_switch_rf(ddev, 0); |
|
|
|
mutex_lock(&ddev->poll_lock); |
|
|
|
if (!ddev->poll_tech_count) { |
|
mutex_unlock(&ddev->poll_lock); |
|
return; |
|
} |
|
|
|
get_random_bytes(&rand_mod, sizeof(rand_mod)); |
|
ddev->poll_tech_index = rand_mod % ddev->poll_tech_count; |
|
|
|
mutex_unlock(&ddev->poll_lock); |
|
|
|
schedule_delayed_work(&ddev->poll_work, |
|
msecs_to_jiffies(DIGITAL_POLL_INTERVAL)); |
|
} |
|
|
|
static void digital_wq_poll(struct work_struct *work) |
|
{ |
|
int rc; |
|
struct digital_poll_tech *poll_tech; |
|
struct nfc_digital_dev *ddev = container_of(work, |
|
struct nfc_digital_dev, |
|
poll_work.work); |
|
mutex_lock(&ddev->poll_lock); |
|
|
|
if (!ddev->poll_tech_count) { |
|
mutex_unlock(&ddev->poll_lock); |
|
return; |
|
} |
|
|
|
poll_tech = &ddev->poll_techs[ddev->poll_tech_index]; |
|
|
|
mutex_unlock(&ddev->poll_lock); |
|
|
|
rc = poll_tech->poll_func(ddev, poll_tech->rf_tech); |
|
if (rc) |
|
digital_poll_next_tech(ddev); |
|
} |
|
|
|
static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech, |
|
digital_poll_t poll_func) |
|
{ |
|
struct digital_poll_tech *poll_tech; |
|
|
|
if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX) |
|
return; |
|
|
|
poll_tech = &ddev->poll_techs[ddev->poll_tech_count++]; |
|
|
|
poll_tech->rf_tech = rf_tech; |
|
poll_tech->poll_func = poll_func; |
|
} |
|
|
|
/** |
|
* digital_start_poll - start_poll operation |
|
* @nfc_dev: device to be polled |
|
* @im_protocols: bitset of nfc initiator protocols to be used for polling |
|
* @tm_protocols: bitset of nfc transport protocols to be used for polling |
|
* |
|
* For every supported protocol, the corresponding polling function is added |
|
* to the table of polling technologies (ddev->poll_techs[]) using |
|
* digital_add_poll_tech(). |
|
* When a polling function fails (by timeout or protocol error) the next one is |
|
* schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work). |
|
*/ |
|
static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols, |
|
__u32 tm_protocols) |
|
{ |
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
|
u32 matching_im_protocols, matching_tm_protocols; |
|
|
|
pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols, |
|
tm_protocols, ddev->protocols); |
|
|
|
matching_im_protocols = ddev->protocols & im_protocols; |
|
matching_tm_protocols = ddev->protocols & tm_protocols; |
|
|
|
if (!matching_im_protocols && !matching_tm_protocols) { |
|
pr_err("Unknown protocol\n"); |
|
return -EINVAL; |
|
} |
|
|
|
if (ddev->poll_tech_count) { |
|
pr_err("Already polling\n"); |
|
return -EBUSY; |
|
} |
|
|
|
if (ddev->curr_protocol) { |
|
pr_err("A target is already active\n"); |
|
return -EBUSY; |
|
} |
|
|
|
ddev->poll_tech_count = 0; |
|
ddev->poll_tech_index = 0; |
|
|
|
if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH) |
|
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A, |
|
digital_in_send_sens_req); |
|
|
|
if (matching_im_protocols & DIGITAL_PROTO_NFCB_RF_TECH) |
|
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106B, |
|
digital_in_send_sensb_req); |
|
|
|
if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) { |
|
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F, |
|
digital_in_send_sensf_req); |
|
|
|
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F, |
|
digital_in_send_sensf_req); |
|
} |
|
|
|
if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH) |
|
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693, |
|
digital_in_send_iso15693_inv_req); |
|
|
|
if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) { |
|
if (ddev->ops->tg_listen_mdaa) { |
|
digital_add_poll_tech(ddev, 0, |
|
digital_tg_listen_mdaa); |
|
} else if (ddev->ops->tg_listen_md) { |
|
digital_add_poll_tech(ddev, 0, |
|
digital_tg_listen_md); |
|
} else { |
|
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A, |
|
digital_tg_listen_nfca); |
|
|
|
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F, |
|
digital_tg_listen_nfcf); |
|
|
|
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F, |
|
digital_tg_listen_nfcf); |
|
} |
|
} |
|
|
|
if (!ddev->poll_tech_count) { |
|
pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n", |
|
matching_im_protocols, matching_tm_protocols); |
|
return -EINVAL; |
|
} |
|
|
|
schedule_delayed_work(&ddev->poll_work, 0); |
|
|
|
return 0; |
|
} |
|
|
|
static void digital_stop_poll(struct nfc_dev *nfc_dev) |
|
{ |
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
|
|
|
mutex_lock(&ddev->poll_lock); |
|
|
|
if (!ddev->poll_tech_count) { |
|
pr_err("Polling operation was not running\n"); |
|
mutex_unlock(&ddev->poll_lock); |
|
return; |
|
} |
|
|
|
ddev->poll_tech_count = 0; |
|
|
|
mutex_unlock(&ddev->poll_lock); |
|
|
|
cancel_delayed_work_sync(&ddev->poll_work); |
|
|
|
digital_abort_cmd(ddev); |
|
} |
|
|
|
static int digital_dev_up(struct nfc_dev *nfc_dev) |
|
{ |
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
|
|
|
digital_switch_rf(ddev, 1); |
|
|
|
return 0; |
|
} |
|
|
|
static int digital_dev_down(struct nfc_dev *nfc_dev) |
|
{ |
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
|
|
|
digital_switch_rf(ddev, 0); |
|
|
|
return 0; |
|
} |
|
|
|
static int digital_dep_link_up(struct nfc_dev *nfc_dev, |
|
struct nfc_target *target, |
|
__u8 comm_mode, __u8 *gb, size_t gb_len) |
|
{ |
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
|
int rc; |
|
|
|
rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len); |
|
|
|
if (!rc) |
|
ddev->curr_protocol = NFC_PROTO_NFC_DEP; |
|
|
|
return rc; |
|
} |
|
|
|
static int digital_dep_link_down(struct nfc_dev *nfc_dev) |
|
{ |
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
|
|
|
digital_abort_cmd(ddev); |
|
|
|
ddev->curr_protocol = 0; |
|
|
|
return 0; |
|
} |
|
|
|
static int digital_activate_target(struct nfc_dev *nfc_dev, |
|
struct nfc_target *target, __u32 protocol) |
|
{ |
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
|
|
|
if (ddev->poll_tech_count) { |
|
pr_err("Can't activate a target while polling\n"); |
|
return -EBUSY; |
|
} |
|
|
|
if (ddev->curr_protocol) { |
|
pr_err("A target is already active\n"); |
|
return -EBUSY; |
|
} |
|
|
|
ddev->curr_protocol = protocol; |
|
|
|
return 0; |
|
} |
|
|
|
static void digital_deactivate_target(struct nfc_dev *nfc_dev, |
|
struct nfc_target *target, |
|
u8 mode) |
|
{ |
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
|
|
|
if (!ddev->curr_protocol) { |
|
pr_err("No active target\n"); |
|
return; |
|
} |
|
|
|
digital_abort_cmd(ddev); |
|
ddev->curr_protocol = 0; |
|
} |
|
|
|
static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb) |
|
{ |
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(dev); |
|
|
|
return digital_tg_send_dep_res(ddev, skb); |
|
} |
|
|
|
static void digital_in_send_complete(struct nfc_digital_dev *ddev, void *arg, |
|
struct sk_buff *resp) |
|
{ |
|
struct digital_data_exch *data_exch = arg; |
|
int rc; |
|
|
|
if (IS_ERR(resp)) { |
|
rc = PTR_ERR(resp); |
|
resp = NULL; |
|
goto done; |
|
} |
|
|
|
if (ddev->curr_protocol == NFC_PROTO_MIFARE) { |
|
rc = digital_in_recv_mifare_res(resp); |
|
/* crc check is done in digital_in_recv_mifare_res() */ |
|
goto done; |
|
} |
|
|
|
if ((ddev->curr_protocol == NFC_PROTO_ISO14443) || |
|
(ddev->curr_protocol == NFC_PROTO_ISO14443_B)) { |
|
rc = digital_in_iso_dep_pull_sod(ddev, resp); |
|
if (rc) |
|
goto done; |
|
} |
|
|
|
rc = ddev->skb_check_crc(resp); |
|
|
|
done: |
|
if (rc) { |
|
kfree_skb(resp); |
|
resp = NULL; |
|
} |
|
|
|
data_exch->cb(data_exch->cb_context, resp, rc); |
|
|
|
kfree(data_exch); |
|
} |
|
|
|
static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target, |
|
struct sk_buff *skb, data_exchange_cb_t cb, |
|
void *cb_context) |
|
{ |
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
|
struct digital_data_exch *data_exch; |
|
int rc; |
|
|
|
data_exch = kzalloc(sizeof(*data_exch), GFP_KERNEL); |
|
if (!data_exch) |
|
return -ENOMEM; |
|
|
|
data_exch->cb = cb; |
|
data_exch->cb_context = cb_context; |
|
|
|
if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) { |
|
rc = digital_in_send_dep_req(ddev, target, skb, data_exch); |
|
goto exit; |
|
} |
|
|
|
if ((ddev->curr_protocol == NFC_PROTO_ISO14443) || |
|
(ddev->curr_protocol == NFC_PROTO_ISO14443_B)) { |
|
rc = digital_in_iso_dep_push_sod(ddev, skb); |
|
if (rc) |
|
goto exit; |
|
} |
|
|
|
ddev->skb_add_crc(skb); |
|
|
|
rc = digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete, |
|
data_exch); |
|
|
|
exit: |
|
if (rc) |
|
kfree(data_exch); |
|
|
|
return rc; |
|
} |
|
|
|
static struct nfc_ops digital_nfc_ops = { |
|
.dev_up = digital_dev_up, |
|
.dev_down = digital_dev_down, |
|
.start_poll = digital_start_poll, |
|
.stop_poll = digital_stop_poll, |
|
.dep_link_up = digital_dep_link_up, |
|
.dep_link_down = digital_dep_link_down, |
|
.activate_target = digital_activate_target, |
|
.deactivate_target = digital_deactivate_target, |
|
.tm_send = digital_tg_send, |
|
.im_transceive = digital_in_send, |
|
}; |
|
|
|
struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops, |
|
__u32 supported_protocols, |
|
__u32 driver_capabilities, |
|
int tx_headroom, int tx_tailroom) |
|
{ |
|
struct nfc_digital_dev *ddev; |
|
|
|
if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen || |
|
!ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd || |
|
!ops->switch_rf || (ops->tg_listen_md && !ops->tg_get_rf_tech)) |
|
return NULL; |
|
|
|
ddev = kzalloc(sizeof(*ddev), GFP_KERNEL); |
|
if (!ddev) |
|
return NULL; |
|
|
|
ddev->driver_capabilities = driver_capabilities; |
|
ddev->ops = ops; |
|
|
|
mutex_init(&ddev->cmd_lock); |
|
INIT_LIST_HEAD(&ddev->cmd_queue); |
|
|
|
INIT_WORK(&ddev->cmd_work, digital_wq_cmd); |
|
INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete); |
|
|
|
mutex_init(&ddev->poll_lock); |
|
INIT_DELAYED_WORK(&ddev->poll_work, digital_wq_poll); |
|
|
|
if (supported_protocols & NFC_PROTO_JEWEL_MASK) |
|
ddev->protocols |= NFC_PROTO_JEWEL_MASK; |
|
if (supported_protocols & NFC_PROTO_MIFARE_MASK) |
|
ddev->protocols |= NFC_PROTO_MIFARE_MASK; |
|
if (supported_protocols & NFC_PROTO_FELICA_MASK) |
|
ddev->protocols |= NFC_PROTO_FELICA_MASK; |
|
if (supported_protocols & NFC_PROTO_NFC_DEP_MASK) |
|
ddev->protocols |= NFC_PROTO_NFC_DEP_MASK; |
|
if (supported_protocols & NFC_PROTO_ISO15693_MASK) |
|
ddev->protocols |= NFC_PROTO_ISO15693_MASK; |
|
if (supported_protocols & NFC_PROTO_ISO14443_MASK) |
|
ddev->protocols |= NFC_PROTO_ISO14443_MASK; |
|
if (supported_protocols & NFC_PROTO_ISO14443_B_MASK) |
|
ddev->protocols |= NFC_PROTO_ISO14443_B_MASK; |
|
|
|
ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN; |
|
ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN; |
|
|
|
ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols, |
|
ddev->tx_headroom, |
|
ddev->tx_tailroom); |
|
if (!ddev->nfc_dev) { |
|
pr_err("nfc_allocate_device failed\n"); |
|
goto free_dev; |
|
} |
|
|
|
nfc_set_drvdata(ddev->nfc_dev, ddev); |
|
|
|
return ddev; |
|
|
|
free_dev: |
|
kfree(ddev); |
|
|
|
return NULL; |
|
} |
|
EXPORT_SYMBOL(nfc_digital_allocate_device); |
|
|
|
void nfc_digital_free_device(struct nfc_digital_dev *ddev) |
|
{ |
|
nfc_free_device(ddev->nfc_dev); |
|
kfree(ddev); |
|
} |
|
EXPORT_SYMBOL(nfc_digital_free_device); |
|
|
|
int nfc_digital_register_device(struct nfc_digital_dev *ddev) |
|
{ |
|
return nfc_register_device(ddev->nfc_dev); |
|
} |
|
EXPORT_SYMBOL(nfc_digital_register_device); |
|
|
|
void nfc_digital_unregister_device(struct nfc_digital_dev *ddev) |
|
{ |
|
struct digital_cmd *cmd, *n; |
|
|
|
nfc_unregister_device(ddev->nfc_dev); |
|
|
|
mutex_lock(&ddev->poll_lock); |
|
ddev->poll_tech_count = 0; |
|
mutex_unlock(&ddev->poll_lock); |
|
|
|
cancel_delayed_work_sync(&ddev->poll_work); |
|
cancel_work_sync(&ddev->cmd_work); |
|
cancel_work_sync(&ddev->cmd_complete_work); |
|
|
|
list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) { |
|
list_del(&cmd->queue); |
|
|
|
/* Call the command callback if any and pass it a ENODEV error. |
|
* This gives a chance to the command issuer to free any |
|
* allocated buffer. |
|
*/ |
|
if (cmd->cmd_cb) |
|
cmd->cmd_cb(ddev, cmd->cb_context, ERR_PTR(-ENODEV)); |
|
|
|
kfree(cmd->mdaa_params); |
|
kfree(cmd); |
|
} |
|
} |
|
EXPORT_SYMBOL(nfc_digital_unregister_device); |
|
|
|
MODULE_LICENSE("GPL");
|
|
|