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-rw-r--r--net/nfc/digital_core.c863
1 files changed, 863 insertions, 0 deletions
diff --git a/net/nfc/digital_core.c b/net/nfc/digital_core.c
new file mode 100644
index 0000000..0fd5518
--- /dev/null
+++ b/net/nfc/digital_core.c
@@ -0,0 +1,863 @@
+/*
+ * NFC Digital Protocol stack
+ * Copyright (c) 2013, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ */
+
+#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(skb, 1) = crc & 0xFF;
+ *skb_put(skb, 1) = (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(struct digital_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(struct digital_tg_mdaa_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;
+}
+
+/**
+ * start_poll operation
+ *
+ * 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;
+ }
+
+ 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(struct digital_data_exch), GFP_KERNEL);
+ if (!data_exch) {
+ pr_err("Failed to allocate data_exch struct\n");
+ 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(struct nfc_digital_dev), 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");