[deliverable/linux.git] / net / nfc / digital_core.c

/*
 * 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.
 *
 */

#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)

#define DIGITAL_PROTO_NFCF_RF_TECH \
	(NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK)

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;
	}

	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;

	default:
		PR_ERR("Unknown cmd type %d", cmd->type);
		return;
	}

	if (!rc)
		return;

	PR_ERR("in_send_command returned err %d", 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", 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", 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);
}

int digital_target_found(struct nfc_digital_dev *ddev,
			 struct nfc_target *target, u8 protocol)
{
	int rc;
	u8 framing;
	u8 rf_tech;
	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;

	default:
		PR_ERR("Invalid protocol %d", protocol);
		return -EINVAL;
	}

	PR_DBG("rf_tech=%d, protocol=%d", rf_tech, protocol);

	ddev->curr_rf_tech = rf_tech;
	ddev->curr_protocol = protocol;

	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);
	rc = nfc_targets_found(ddev->nfc_dev, target, 1);
	if (rc)
		return rc;

	ddev->poll_tech_count = 0;

	return 0;
}

void digital_poll_next_tech(struct nfc_digital_dev *ddev)
{
	digital_switch_rf(ddev, 0);

	mutex_lock(&ddev->poll_lock);

	if (!ddev->poll_tech_count) {
		mutex_unlock(&ddev->poll_lock);
		return;
	}

	ddev->poll_tech_index = (ddev->poll_tech_index + 1) %
				ddev->poll_tech_count;

	mutex_unlock(&ddev->poll_lock);

	schedule_work(&ddev->poll_work);
}

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);
	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_DBG("protocols: im 0x%x, tm 0x%x, supported 0x%x", 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("No known protocol");
		return -EINVAL;
	}

	if (ddev->poll_tech_count) {
		PR_ERR("Already polling");
		return -EBUSY;
	}

	if (ddev->curr_protocol) {
		PR_ERR("A target is already active");
		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 (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 (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
		if (ddev->ops->tg_listen_mdaa) {
			digital_add_poll_tech(ddev, 0,
					      digital_tg_listen_mdaa);
		} 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",
		       matching_im_protocols, matching_tm_protocols);
		return -EINVAL;
	}

	schedule_work(&ddev->poll_work);

	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");
		mutex_unlock(&ddev->poll_lock);
		return;
	}

	ddev->poll_tech_count = 0;

	mutex_unlock(&ddev->poll_lock);

	cancel_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);

	return digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
}

static int digital_dep_link_down(struct nfc_dev *nfc_dev)
{
	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);

	ddev->curr_protocol = 0;

	return 0;
}

static int digital_activate_target(struct nfc_dev *nfc_dev,
				   struct nfc_target *target, __u32 protocol)
{
	return 0;
}

static void digital_deactivate_target(struct nfc_dev *nfc_dev,
				      struct nfc_target *target)
{
	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);

	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);
		goto done;
	}

	if (ddev->curr_protocol == NFC_PROTO_MIFARE)
		rc = digital_in_recv_mifare_res(resp);
	else
		rc = ddev->skb_check_crc(resp);

	if (rc) {
		kfree_skb(resp);
		resp = NULL;
	}

done:
	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;

	data_exch = kzalloc(sizeof(struct digital_data_exch), GFP_KERNEL);
	if (!data_exch) {
		PR_ERR("Failed to allocate data_exch struct");
		return -ENOMEM;
	}

	data_exch->cb = cb;
	data_exch->cb_context = cb_context;

	if (ddev->curr_protocol == NFC_PROTO_NFC_DEP)
		return digital_in_send_dep_req(ddev, target, skb, data_exch);

	ddev->skb_add_crc(skb);

	return digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete,
				   data_exch);
}

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)
		return NULL;

	ddev = kzalloc(sizeof(struct nfc_digital_dev), GFP_KERNEL);
	if (!ddev) {
		PR_ERR("kzalloc failed");
		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_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;

	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");
		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_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);
		kfree(cmd->mdaa_params);
		kfree(cmd);
	}
}
EXPORT_SYMBOL(nfc_digital_unregister_device);

MODULE_LICENSE("GPL");
Commit	Line	Data
4b10884e TE	1	/*
	2	* NFC Digital Protocol stack
	3	* Copyright (c) 2013, Intel Corporation.
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms and conditions of the GNU General Public License,
	7	* version 2, as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*
	14	*/
	15
	16	#include <linux/module.h>
	17
	18	#include "digital.h"
	19
59ee2361	20	#define DIGITAL_PROTO_NFCA_RF_TECH \
7d0911c0	21	(NFC_PROTO_JEWEL_MASK \| NFC_PROTO_MIFARE_MASK \| NFC_PROTO_NFC_DEP_MASK)
59ee2361	22
7d0911c0 TE	23	#define DIGITAL_PROTO_NFCF_RF_TECH \
7d0911c0 TE	24	(NFC_PROTO_FELICA_MASK \| NFC_PROTO_NFC_DEP_MASK)
8c0695e4	25
59ee2361 TE	26	struct digital_cmd {
	27	struct list_head queue;
	28
	29	u8 type;
	30	u8 pending;
	31
	32	u16 timeout;
	33	struct sk_buff *req;
	34	struct sk_buff *resp;
1c7a4c24	35	struct digital_tg_mdaa_params *mdaa_params;
59ee2361 TE	36
	37	nfc_digital_cmd_complete_t cmd_cb;
	38	void *cb_context;
	39	};
	40
	41	struct sk_buff digital_skb_alloc(struct nfc_digital_dev ddev,
	42	unsigned int len)
	43	{
	44	struct sk_buff *skb;
	45
	46	skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom,
	47	GFP_KERNEL);
	48	if (skb)
	49	skb_reserve(skb, ddev->tx_headroom);
	50
	51	return skb;
	52	}
	53
2c66daec TE	54	void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
	55	u8 bitwise_inv, u8 msb_first)
	56	{
	57	u16 crc;
	58
	59	crc = crc_func(init, skb->data, skb->len);
	60
	61	if (bitwise_inv)
	62	crc = ~crc;
	63
	64	if (msb_first)
	65	crc = __fswab16(crc);
	66
	67	*skb_put(skb, 1) = crc & 0xFF;
	68	*skb_put(skb, 1) = (crc >> 8) & 0xFF;
	69	}
	70
	71	int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
	72	u16 crc_init, u8 bitwise_inv, u8 msb_first)
	73	{
	74	int rc;
	75	u16 crc;
	76
	77	if (skb->len <= 2)
	78	return -EIO;
	79
	80	crc = crc_func(crc_init, skb->data, skb->len - 2);
	81
	82	if (bitwise_inv)
	83	crc = ~crc;
	84
	85	if (msb_first)
	86	crc = __swab16(crc);
	87
	88	rc = (skb->data[skb->len - 2] - (crc & 0xFF)) +
	89	(skb->data[skb->len - 1] - ((crc >> 8) & 0xFF));
	90
	91	if (rc)
	92	return -EIO;
	93
	94	skb_trim(skb, skb->len - 2);
	95
	96	return 0;
	97	}
	98
59ee2361 TE	99	static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on)
	100	{
	101	ddev->ops->switch_rf(ddev, on);
	102	}
	103
	104	static inline void digital_abort_cmd(struct nfc_digital_dev *ddev)
	105	{
	106	ddev->ops->abort_cmd(ddev);
	107	}
	108
	109	static void digital_wq_cmd_complete(struct work_struct *work)
	110	{
	111	struct digital_cmd *cmd;
	112	struct nfc_digital_dev *ddev = container_of(work,
	113	struct nfc_digital_dev,
	114	cmd_complete_work);
	115
	116	mutex_lock(&ddev->cmd_lock);
	117
	118	cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
	119	queue);
	120	if (!cmd) {
	121	mutex_unlock(&ddev->cmd_lock);
	122	return;
	123	}
	124
	125	list_del(&cmd->queue);
	126
	127	mutex_unlock(&ddev->cmd_lock);
	128
	129	if (!IS_ERR(cmd->resp))
	130	print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1,
	131	cmd->resp->data, cmd->resp->len, false);
	132
	133	cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp);
	134
1c7a4c24	135	kfree(cmd->mdaa_params);
59ee2361 TE	136	kfree(cmd);
	137
	138	schedule_work(&ddev->cmd_work);
	139	}
	140
	141	static void digital_send_cmd_complete(struct nfc_digital_dev *ddev,
	142	void arg, struct sk_buff resp)
	143	{
	144	struct digital_cmd *cmd = arg;
	145
	146	cmd->resp = resp;
	147
	148	schedule_work(&ddev->cmd_complete_work);
	149	}
	150
	151	static void digital_wq_cmd(struct work_struct *work)
	152	{
	153	int rc;
	154	struct digital_cmd *cmd;
1c7a4c24	155	struct digital_tg_mdaa_params *params;
59ee2361 TE	156	struct nfc_digital_dev *ddev = container_of(work,
	157	struct nfc_digital_dev,
	158	cmd_work);
	159
	160	mutex_lock(&ddev->cmd_lock);
	161
	162	cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
	163	queue);
	164	if (!cmd \|\| cmd->pending) {
	165	mutex_unlock(&ddev->cmd_lock);
	166	return;
	167	}
	168
	169	mutex_unlock(&ddev->cmd_lock);
	170
	171	if (cmd->req)
	172	print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1,
	173	cmd->req->data, cmd->req->len, false);
	174
	175	switch (cmd->type) {
	176	case DIGITAL_CMD_IN_SEND:
	177	rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout,
	178	digital_send_cmd_complete, cmd);
	179	break;
1c7a4c24 TE	180
	181	case DIGITAL_CMD_TG_SEND:
	182	rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout,
	183	digital_send_cmd_complete, cmd);
	184	break;
	185
	186	case DIGITAL_CMD_TG_LISTEN:
	187	rc = ddev->ops->tg_listen(ddev, cmd->timeout,
	188	digital_send_cmd_complete, cmd);
	189	break;
	190
	191	case DIGITAL_CMD_TG_LISTEN_MDAA:
	192	params = cmd->mdaa_params;
	193
	194	rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout,
	195	digital_send_cmd_complete, cmd);
	196	break;
	197
59ee2361 TE	198	default:
	199	PR_ERR("Unknown cmd type %d", cmd->type);
	200	return;
	201	}
	202
	203	if (!rc)
	204	return;
	205
	206	PR_ERR("in_send_command returned err %d", rc);
	207
	208	mutex_lock(&ddev->cmd_lock);
	209	list_del(&cmd->queue);
	210	mutex_unlock(&ddev->cmd_lock);
	211
	212	kfree_skb(cmd->req);
1c7a4c24	213	kfree(cmd->mdaa_params);
59ee2361 TE	214	kfree(cmd);
	215
	216	schedule_work(&ddev->cmd_work);
	217	}
	218
	219	int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
1c7a4c24 TE	220	struct sk_buff skb, struct digital_tg_mdaa_params params,
	221	u16 timeout, nfc_digital_cmd_complete_t cmd_cb,
	222	void *cb_context)
59ee2361 TE	223	{
	224	struct digital_cmd *cmd;
	225
	226	cmd = kzalloc(sizeof(struct digital_cmd), GFP_KERNEL);
	227	if (!cmd)
	228	return -ENOMEM;
	229
	230	cmd->type = cmd_type;
	231	cmd->timeout = timeout;
	232	cmd->req = skb;
1c7a4c24	233	cmd->mdaa_params = params;
59ee2361 TE	234	cmd->cmd_cb = cmd_cb;
	235	cmd->cb_context = cb_context;
	236	INIT_LIST_HEAD(&cmd->queue);
	237
	238	mutex_lock(&ddev->cmd_lock);
	239	list_add_tail(&cmd->queue, &ddev->cmd_queue);
	240	mutex_unlock(&ddev->cmd_lock);
	241
	242	schedule_work(&ddev->cmd_work);
	243
	244	return 0;
	245	}
	246
	247	int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
	248	{
	249	int rc;
	250
	251	rc = ddev->ops->in_configure_hw(ddev, type, param);
	252	if (rc)
	253	PR_ERR("in_configure_hw failed: %d", rc);
	254
	255	return rc;
	256	}
	257
1c7a4c24 TE	258	int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
	259	{
	260	int rc;
	261
	262	rc = ddev->ops->tg_configure_hw(ddev, type, param);
	263	if (rc)
	264	PR_ERR("tg_configure_hw failed: %d", rc);
	265
	266	return rc;
	267	}
	268
	269	static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech)
	270	{
	271	struct digital_tg_mdaa_params *params;
	272
	273	params = kzalloc(sizeof(struct digital_tg_mdaa_params), GFP_KERNEL);
	274	if (!params)
	275	return -ENOMEM;
	276
	277	params->sens_res = DIGITAL_SENS_RES_NFC_DEP;
	278	get_random_bytes(params->nfcid1, sizeof(params->nfcid1));
	279	params->sel_res = DIGITAL_SEL_RES_NFC_DEP;
	280
	281	params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1;
	282	params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2;
	283	get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2);
	284	params->sc = DIGITAL_SENSF_FELICA_SC;
	285
	286	return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params,
	287	500, digital_tg_recv_atr_req, NULL);
	288	}
	289
2c66daec TE	290	int digital_target_found(struct nfc_digital_dev *ddev,
	291	struct nfc_target *target, u8 protocol)
	292	{
	293	int rc;
	294	u8 framing;
	295	u8 rf_tech;
	296	int (check_crc)(struct sk_buff skb);
	297	void (add_crc)(struct sk_buff skb);
	298
	299	rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech;
	300
	301	switch (protocol) {
	302	case NFC_PROTO_JEWEL:
	303	framing = NFC_DIGITAL_FRAMING_NFCA_T1T;
	304	check_crc = digital_skb_check_crc_b;
	305	add_crc = digital_skb_add_crc_b;
	306	break;
	307
	308	case NFC_PROTO_MIFARE:
	309	framing = NFC_DIGITAL_FRAMING_NFCA_T2T;
	310	check_crc = digital_skb_check_crc_a;
	311	add_crc = digital_skb_add_crc_a;
	312	break;
	313
8c0695e4 TE	314	case NFC_PROTO_FELICA:
	315	framing = NFC_DIGITAL_FRAMING_NFCF_T3T;
	316	check_crc = digital_skb_check_crc_f;
	317	add_crc = digital_skb_add_crc_f;
	318	break;
	319
7d0911c0 TE	320	case NFC_PROTO_NFC_DEP:
	321	if (rf_tech == NFC_DIGITAL_RF_TECH_106A) {
	322	framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP;
	323	check_crc = digital_skb_check_crc_a;
	324	add_crc = digital_skb_add_crc_a;
	325	} else {
	326	framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP;
	327	check_crc = digital_skb_check_crc_f;
	328	add_crc = digital_skb_add_crc_f;
	329	}
	330	break;
	331
2c66daec TE	332	default:
	333	PR_ERR("Invalid protocol %d", protocol);
	334	return -EINVAL;
	335	}
	336
	337	PR_DBG("rf_tech=%d, protocol=%d", rf_tech, protocol);
	338
	339	ddev->curr_rf_tech = rf_tech;
	340	ddev->curr_protocol = protocol;
	341
	342	if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
	343	ddev->skb_add_crc = digital_skb_add_crc_none;
	344	ddev->skb_check_crc = digital_skb_check_crc_none;
	345	} else {
	346	ddev->skb_add_crc = add_crc;
	347	ddev->skb_check_crc = check_crc;
	348	}
	349
	350	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing);
	351	if (rc)
	352	return rc;
	353
	354	target->supported_protocols = (1 << protocol);
	355	rc = nfc_targets_found(ddev->nfc_dev, target, 1);
	356	if (rc)
	357	return rc;
	358
	359	ddev->poll_tech_count = 0;
	360
	361	return 0;
	362	}
	363
59ee2361 TE	364	void digital_poll_next_tech(struct nfc_digital_dev *ddev)
	365	{
	366	digital_switch_rf(ddev, 0);
	367
	368	mutex_lock(&ddev->poll_lock);
	369
	370	if (!ddev->poll_tech_count) {
	371	mutex_unlock(&ddev->poll_lock);
	372	return;
	373	}
	374
	375	ddev->poll_tech_index = (ddev->poll_tech_index + 1) %
	376	ddev->poll_tech_count;
	377
	378	mutex_unlock(&ddev->poll_lock);
	379
	380	schedule_work(&ddev->poll_work);
	381	}
	382
	383	static void digital_wq_poll(struct work_struct *work)
	384	{
	385	int rc;
	386	struct digital_poll_tech *poll_tech;
	387	struct nfc_digital_dev *ddev = container_of(work,
	388	struct nfc_digital_dev,
	389	poll_work);
	390	mutex_lock(&ddev->poll_lock);
	391
	392	if (!ddev->poll_tech_count) {
	393	mutex_unlock(&ddev->poll_lock);
	394	return;
	395	}
	396
	397	poll_tech = &ddev->poll_techs[ddev->poll_tech_index];
	398
	399	mutex_unlock(&ddev->poll_lock);
	400
	401	rc = poll_tech->poll_func(ddev, poll_tech->rf_tech);
	402	if (rc)
	403	digital_poll_next_tech(ddev);
	404	}
	405
	406	static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech,
	407	digital_poll_t poll_func)
	408	{
	409	struct digital_poll_tech *poll_tech;
	410
	411	if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX)
	412	return;
	413
	414	poll_tech = &ddev->poll_techs[ddev->poll_tech_count++];
	415
	416	poll_tech->rf_tech = rf_tech;
	417	poll_tech->poll_func = poll_func;
	418	}
	419
	420	/**
	421	* start_poll operation
	422	*
	423	* For every supported protocol, the corresponding polling function is added
	424	* to the table of polling technologies (ddev->poll_techs[]) using
	425	* digital_add_poll_tech().
	426	* When a polling function fails (by timeout or protocol error) the next one is
	427	* schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work).
428	*/
4b10884e TE	429	static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
	430	__u32 tm_protocols)
	431	{
59ee2361 TE	432	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	433	u32 matching_im_protocols, matching_tm_protocols;
	434
	435	PR_DBG("protocols: im 0x%x, tm 0x%x, supported 0x%x", im_protocols,
	436	tm_protocols, ddev->protocols);
	437
	438	matching_im_protocols = ddev->protocols & im_protocols;
	439	matching_tm_protocols = ddev->protocols & tm_protocols;
	440
	441	if (!matching_im_protocols && !matching_tm_protocols) {
	442	PR_ERR("No known protocol");
	443	return -EINVAL;
	444	}
	445
	446	if (ddev->poll_tech_count) {
	447	PR_ERR("Already polling");
	448	return -EBUSY;
	449	}
	450
	451	if (ddev->curr_protocol) {
	452	PR_ERR("A target is already active");
	453	return -EBUSY;
	454	}
	455
	456	ddev->poll_tech_count = 0;
	457	ddev->poll_tech_index = 0;
	458
	459	if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH)
	460	digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
	461	digital_in_send_sens_req);
	462
8c0695e4 TE	463	if (im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) {
	464	digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
	465	digital_in_send_sensf_req);
	466
	467	digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
	468	digital_in_send_sensf_req);
	469	}
	470
1c7a4c24 TE	471	if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
	472	if (ddev->ops->tg_listen_mdaa) {
	473	digital_add_poll_tech(ddev, 0,
	474	digital_tg_listen_mdaa);
	475	} else {
	476	digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
	477	digital_tg_listen_nfca);
	478
	479	digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
	480	digital_tg_listen_nfcf);
	481
	482	digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
	483	digital_tg_listen_nfcf);
	484	}
	485	}
	486
59ee2361 TE	487	if (!ddev->poll_tech_count) {
	488	PR_ERR("Unsupported protocols: im=0x%x, tm=0x%x",
	489	matching_im_protocols, matching_tm_protocols);
	490	return -EINVAL;
	491	}
	492
	493	schedule_work(&ddev->poll_work);
	494
	495	return 0;
4b10884e TE	496	}
	497
	498	static void digital_stop_poll(struct nfc_dev *nfc_dev)
	499	{
59ee2361 TE	500	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	501
	502	mutex_lock(&ddev->poll_lock);
	503
	504	if (!ddev->poll_tech_count) {
	505	PR_ERR("Polling operation was not running");
	506	mutex_unlock(&ddev->poll_lock);
	507	return;
	508	}
	509
	510	ddev->poll_tech_count = 0;
	511
	512	mutex_unlock(&ddev->poll_lock);
	513
	514	cancel_work_sync(&ddev->poll_work);
	515
	516	digital_abort_cmd(ddev);
4b10884e TE	517	}
	518
	519	static int digital_dev_up(struct nfc_dev *nfc_dev)
	520	{
59ee2361 TE	521	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	522
	523	digital_switch_rf(ddev, 1);
	524
	525	return 0;
4b10884e TE	526	}
	527
	528	static int digital_dev_down(struct nfc_dev *nfc_dev)
	529	{
59ee2361 TE	530	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	531
	532	digital_switch_rf(ddev, 0);
	533
	534	return 0;
4b10884e TE	535	}
	536
	537	static int digital_dep_link_up(struct nfc_dev *nfc_dev,
	538	struct nfc_target *target,
	539	__u8 comm_mode, __u8 *gb, size_t gb_len)
	540	{
7d0911c0 TE	541	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	542
	543	return digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
4b10884e TE	544	}
	545
	546	static int digital_dep_link_down(struct nfc_dev *nfc_dev)
	547	{
7d0911c0 TE	548	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	549
	550	ddev->curr_protocol = 0;
	551
	552	return 0;
4b10884e TE	553	}
	554
	555	static int digital_activate_target(struct nfc_dev *nfc_dev,
	556	struct nfc_target *target, __u32 protocol)
	557	{
59ee2361	558	return 0;
4b10884e TE	559	}
	560
	561	static void digital_deactivate_target(struct nfc_dev *nfc_dev,
	562	struct nfc_target *target)
	563	{
59ee2361 TE	564	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	565
	566	ddev->curr_protocol = 0;
4b10884e TE	567	}
	568
	569	static int digital_tg_send(struct nfc_dev dev, struct sk_buff skb)
	570	{
1c7a4c24 TE	571	struct nfc_digital_dev *ddev = nfc_get_drvdata(dev);
	572
	573	return digital_tg_send_dep_res(ddev, skb);
4b10884e TE	574	}
4b10884e TE	575
2c66daec TE	576	static void digital_in_send_complete(struct nfc_digital_dev ddev, void arg,
	577	struct sk_buff *resp)
	578	{
	579	struct digital_data_exch *data_exch = arg;
	580	int rc;
	581
	582	if (IS_ERR(resp)) {
	583	rc = PTR_ERR(resp);
	584	goto done;
	585	}
	586
	587	if (ddev->curr_protocol == NFC_PROTO_MIFARE)
	588	rc = digital_in_recv_mifare_res(resp);
	589	else
	590	rc = ddev->skb_check_crc(resp);
	591
	592	if (rc) {
	593	kfree_skb(resp);
	594	resp = NULL;
	595	}
	596
	597	done:
	598	data_exch->cb(data_exch->cb_context, resp, rc);
	599
	600	kfree(data_exch);
	601	}
	602
4b10884e TE	603	static int digital_in_send(struct nfc_dev nfc_dev, struct nfc_target target,
	604	struct sk_buff *skb, data_exchange_cb_t cb,
	605	void *cb_context)
	606	{
2c66daec TE	607	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	608	struct digital_data_exch *data_exch;
	609
	610	data_exch = kzalloc(sizeof(struct digital_data_exch), GFP_KERNEL);
	611	if (!data_exch) {
	612	PR_ERR("Failed to allocate data_exch struct");
	613	return -ENOMEM;
	614	}
	615
	616	data_exch->cb = cb;
	617	data_exch->cb_context = cb_context;
	618
7d0911c0 TE	619	if (ddev->curr_protocol == NFC_PROTO_NFC_DEP)
	620	return digital_in_send_dep_req(ddev, target, skb, data_exch);
	621
2c66daec TE	622	ddev->skb_add_crc(skb);
	623
	624	return digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete,
	625	data_exch);
4b10884e TE	626	}
	627
	628	static struct nfc_ops digital_nfc_ops = {
	629	.dev_up = digital_dev_up,
	630	.dev_down = digital_dev_down,
	631	.start_poll = digital_start_poll,
	632	.stop_poll = digital_stop_poll,
	633	.dep_link_up = digital_dep_link_up,
	634	.dep_link_down = digital_dep_link_down,
	635	.activate_target = digital_activate_target,
	636	.deactivate_target = digital_deactivate_target,
	637	.tm_send = digital_tg_send,
	638	.im_transceive = digital_in_send,
	639	};
	640
	641	struct nfc_digital_dev nfc_digital_allocate_device(struct nfc_digital_ops ops,
	642	__u32 supported_protocols,
	643	__u32 driver_capabilities,
	644	int tx_headroom, int tx_tailroom)
	645	{
	646	struct nfc_digital_dev *ddev;
	647
	648	if (!ops->in_configure_hw \|\| !ops->in_send_cmd \|\| !ops->tg_listen \|\|
	649	!ops->tg_configure_hw \|\| !ops->tg_send_cmd \|\| !ops->abort_cmd \|\|
	650	!ops->switch_rf)
	651	return NULL;
	652
	653	ddev = kzalloc(sizeof(struct nfc_digital_dev), GFP_KERNEL);
	654	if (!ddev) {
	655	PR_ERR("kzalloc failed");
	656	return NULL;
	657	}
	658
	659	ddev->driver_capabilities = driver_capabilities;
	660	ddev->ops = ops;
	661
59ee2361 TE	662	mutex_init(&ddev->cmd_lock);
	663	INIT_LIST_HEAD(&ddev->cmd_queue);
	664
	665	INIT_WORK(&ddev->cmd_work, digital_wq_cmd);
	666	INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete);
	667
	668	mutex_init(&ddev->poll_lock);
	669	INIT_WORK(&ddev->poll_work, digital_wq_poll);
	670
	671	if (supported_protocols & NFC_PROTO_JEWEL_MASK)
	672	ddev->protocols \|= NFC_PROTO_JEWEL_MASK;
	673	if (supported_protocols & NFC_PROTO_MIFARE_MASK)
	674	ddev->protocols \|= NFC_PROTO_MIFARE_MASK;
8c0695e4 TE	675	if (supported_protocols & NFC_PROTO_FELICA_MASK)
8c0695e4 TE	676	ddev->protocols \|= NFC_PROTO_FELICA_MASK;
7d0911c0 TE	677	if (supported_protocols & NFC_PROTO_NFC_DEP_MASK)
7d0911c0 TE	678	ddev->protocols \|= NFC_PROTO_NFC_DEP_MASK;
59ee2361 TE	679
	680	ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
	681	ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;
4b10884e TE	682
	683	ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols,
	684	ddev->tx_headroom,
	685	ddev->tx_tailroom);
	686	if (!ddev->nfc_dev) {
	687	PR_ERR("nfc_allocate_device failed");
	688	goto free_dev;
	689	}
	690
	691	nfc_set_drvdata(ddev->nfc_dev, ddev);
	692
	693	return ddev;
	694
	695	free_dev:
	696	kfree(ddev);
	697
	698	return NULL;
	699	}
	700	EXPORT_SYMBOL(nfc_digital_allocate_device);
	701
	702	void nfc_digital_free_device(struct nfc_digital_dev *ddev)
	703	{
	704	nfc_free_device(ddev->nfc_dev);
4b10884e TE	705	kfree(ddev);
	706	}
	707	EXPORT_SYMBOL(nfc_digital_free_device);
	708
	709	int nfc_digital_register_device(struct nfc_digital_dev *ddev)
	710	{
	711	return nfc_register_device(ddev->nfc_dev);
	712	}
	713	EXPORT_SYMBOL(nfc_digital_register_device);
	714
	715	void nfc_digital_unregister_device(struct nfc_digital_dev *ddev)
	716	{
59ee2361 TE	717	struct digital_cmd cmd, n;
59ee2361 TE	718
4b10884e	719	nfc_unregister_device(ddev->nfc_dev);
59ee2361 TE	720
	721	mutex_lock(&ddev->poll_lock);
	722	ddev->poll_tech_count = 0;
	723	mutex_unlock(&ddev->poll_lock);
	724
	725	cancel_work_sync(&ddev->poll_work);
	726	cancel_work_sync(&ddev->cmd_work);
	727	cancel_work_sync(&ddev->cmd_complete_work);
	728
	729	list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) {
	730	list_del(&cmd->queue);
1c7a4c24	731	kfree(cmd->mdaa_params);
59ee2361 TE	732	kfree(cmd);
59ee2361 TE	733	}
4b10884e TE	734	}
	735	EXPORT_SYMBOL(nfc_digital_unregister_device);
	736
	737	MODULE_LICENSE("GPL");