[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.
 *
 */

#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)

#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\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);
}

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\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);
	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_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 (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\n",
		       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\n");
		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);
	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);

	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)
{
	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);
		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\n");
		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)
		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\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_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
c5da0e4a SO	16	#define pr_fmt(fmt) "digital: %s: " fmt, __func__
c5da0e4a SO	17
4b10884e TE	18	#include <linux/module.h>
	19
	20	#include "digital.h"
	21
59ee2361	22	#define DIGITAL_PROTO_NFCA_RF_TECH \
7d0911c0	23	(NFC_PROTO_JEWEL_MASK \| NFC_PROTO_MIFARE_MASK \| NFC_PROTO_NFC_DEP_MASK)
59ee2361	24
7d0911c0 TE	25	#define DIGITAL_PROTO_NFCF_RF_TECH \
7d0911c0 TE	26	(NFC_PROTO_FELICA_MASK \| NFC_PROTO_NFC_DEP_MASK)
8c0695e4	27
59ee2361 TE	28	struct digital_cmd {
	29	struct list_head queue;
	30
	31	u8 type;
	32	u8 pending;
	33
	34	u16 timeout;
	35	struct sk_buff *req;
	36	struct sk_buff *resp;
1c7a4c24	37	struct digital_tg_mdaa_params *mdaa_params;
59ee2361 TE	38
	39	nfc_digital_cmd_complete_t cmd_cb;
	40	void *cb_context;
	41	};
	42
	43	struct sk_buff digital_skb_alloc(struct nfc_digital_dev ddev,
	44	unsigned int len)
	45	{
	46	struct sk_buff *skb;
	47
	48	skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom,
	49	GFP_KERNEL);
	50	if (skb)
	51	skb_reserve(skb, ddev->tx_headroom);
	52
	53	return skb;
	54	}
	55
2c66daec TE	56	void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
	57	u8 bitwise_inv, u8 msb_first)
	58	{
	59	u16 crc;
	60
	61	crc = crc_func(init, skb->data, skb->len);
	62
	63	if (bitwise_inv)
	64	crc = ~crc;
	65
	66	if (msb_first)
	67	crc = __fswab16(crc);
	68
	69	*skb_put(skb, 1) = crc & 0xFF;
	70	*skb_put(skb, 1) = (crc >> 8) & 0xFF;
	71	}
	72
	73	int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
	74	u16 crc_init, u8 bitwise_inv, u8 msb_first)
	75	{
	76	int rc;
	77	u16 crc;
	78
	79	if (skb->len <= 2)
	80	return -EIO;
	81
	82	crc = crc_func(crc_init, skb->data, skb->len - 2);
	83
	84	if (bitwise_inv)
	85	crc = ~crc;
	86
	87	if (msb_first)
	88	crc = __swab16(crc);
	89
	90	rc = (skb->data[skb->len - 2] - (crc & 0xFF)) +
	91	(skb->data[skb->len - 1] - ((crc >> 8) & 0xFF));
	92
	93	if (rc)
	94	return -EIO;
	95
	96	skb_trim(skb, skb->len - 2);
	97
	98	return 0;
	99	}
	100
59ee2361 TE	101	static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on)
	102	{
	103	ddev->ops->switch_rf(ddev, on);
	104	}
	105
	106	static inline void digital_abort_cmd(struct nfc_digital_dev *ddev)
	107	{
	108	ddev->ops->abort_cmd(ddev);
	109	}
	110
	111	static void digital_wq_cmd_complete(struct work_struct *work)
	112	{
	113	struct digital_cmd *cmd;
	114	struct nfc_digital_dev *ddev = container_of(work,
	115	struct nfc_digital_dev,
	116	cmd_complete_work);
	117
	118	mutex_lock(&ddev->cmd_lock);
	119
	120	cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
	121	queue);
	122	if (!cmd) {
	123	mutex_unlock(&ddev->cmd_lock);
	124	return;
	125	}
	126
	127	list_del(&cmd->queue);
	128
	129	mutex_unlock(&ddev->cmd_lock);
	130
	131	if (!IS_ERR(cmd->resp))
	132	print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1,
	133	cmd->resp->data, cmd->resp->len, false);
	134
	135	cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp);
	136
1c7a4c24	137	kfree(cmd->mdaa_params);
59ee2361 TE	138	kfree(cmd);
	139
	140	schedule_work(&ddev->cmd_work);
	141	}
	142
	143	static void digital_send_cmd_complete(struct nfc_digital_dev *ddev,
	144	void arg, struct sk_buff resp)
	145	{
	146	struct digital_cmd *cmd = arg;
	147
	148	cmd->resp = resp;
	149
	150	schedule_work(&ddev->cmd_complete_work);
	151	}
	152
	153	static void digital_wq_cmd(struct work_struct *work)
	154	{
	155	int rc;
	156	struct digital_cmd *cmd;
1c7a4c24	157	struct digital_tg_mdaa_params *params;
59ee2361 TE	158	struct nfc_digital_dev *ddev = container_of(work,
	159	struct nfc_digital_dev,
	160	cmd_work);
	161
	162	mutex_lock(&ddev->cmd_lock);
	163
	164	cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
	165	queue);
	166	if (!cmd \|\| cmd->pending) {
	167	mutex_unlock(&ddev->cmd_lock);
	168	return;
	169	}
	170
	171	mutex_unlock(&ddev->cmd_lock);
	172
	173	if (cmd->req)
	174	print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1,
	175	cmd->req->data, cmd->req->len, false);
	176
	177	switch (cmd->type) {
	178	case DIGITAL_CMD_IN_SEND:
	179	rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout,
	180	digital_send_cmd_complete, cmd);
	181	break;
1c7a4c24 TE	182
	183	case DIGITAL_CMD_TG_SEND:
	184	rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout,
	185	digital_send_cmd_complete, cmd);
	186	break;
	187
	188	case DIGITAL_CMD_TG_LISTEN:
	189	rc = ddev->ops->tg_listen(ddev, cmd->timeout,
	190	digital_send_cmd_complete, cmd);
	191	break;
	192
	193	case DIGITAL_CMD_TG_LISTEN_MDAA:
	194	params = cmd->mdaa_params;
	195
	196	rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout,
	197	digital_send_cmd_complete, cmd);
	198	break;
	199
59ee2361	200	default:
26042530	201	pr_err("Unknown cmd type %d\n", cmd->type);
59ee2361 TE	202	return;
	203	}
	204
	205	if (!rc)
	206	return;
	207
26042530	208	pr_err("in_send_command returned err %d\n", rc);
59ee2361 TE	209
	210	mutex_lock(&ddev->cmd_lock);
	211	list_del(&cmd->queue);
	212	mutex_unlock(&ddev->cmd_lock);
	213
	214	kfree_skb(cmd->req);
1c7a4c24	215	kfree(cmd->mdaa_params);
59ee2361 TE	216	kfree(cmd);
	217
	218	schedule_work(&ddev->cmd_work);
	219	}
	220
	221	int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
1c7a4c24 TE	222	struct sk_buff skb, struct digital_tg_mdaa_params params,
	223	u16 timeout, nfc_digital_cmd_complete_t cmd_cb,
	224	void *cb_context)
59ee2361 TE	225	{
	226	struct digital_cmd *cmd;
	227
	228	cmd = kzalloc(sizeof(struct digital_cmd), GFP_KERNEL);
	229	if (!cmd)
	230	return -ENOMEM;
	231
	232	cmd->type = cmd_type;
	233	cmd->timeout = timeout;
	234	cmd->req = skb;
1c7a4c24	235	cmd->mdaa_params = params;
59ee2361 TE	236	cmd->cmd_cb = cmd_cb;
	237	cmd->cb_context = cb_context;
	238	INIT_LIST_HEAD(&cmd->queue);
	239
	240	mutex_lock(&ddev->cmd_lock);
	241	list_add_tail(&cmd->queue, &ddev->cmd_queue);
	242	mutex_unlock(&ddev->cmd_lock);
	243
	244	schedule_work(&ddev->cmd_work);
	245
	246	return 0;
	247	}
	248
	249	int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
	250	{
	251	int rc;
	252
	253	rc = ddev->ops->in_configure_hw(ddev, type, param);
	254	if (rc)
26042530	255	pr_err("in_configure_hw failed: %d\n", rc);
59ee2361 TE	256
	257	return rc;
	258	}
	259
1c7a4c24 TE	260	int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
	261	{
	262	int rc;
	263
	264	rc = ddev->ops->tg_configure_hw(ddev, type, param);
	265	if (rc)
26042530	266	pr_err("tg_configure_hw failed: %d\n", rc);
1c7a4c24 TE	267
	268	return rc;
	269	}
	270
	271	static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech)
	272	{
	273	struct digital_tg_mdaa_params *params;
	274
	275	params = kzalloc(sizeof(struct digital_tg_mdaa_params), GFP_KERNEL);
	276	if (!params)
	277	return -ENOMEM;
	278
	279	params->sens_res = DIGITAL_SENS_RES_NFC_DEP;
	280	get_random_bytes(params->nfcid1, sizeof(params->nfcid1));
	281	params->sel_res = DIGITAL_SEL_RES_NFC_DEP;
	282
	283	params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1;
	284	params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2;
	285	get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2);
	286	params->sc = DIGITAL_SENSF_FELICA_SC;
	287
	288	return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params,
	289	500, digital_tg_recv_atr_req, NULL);
	290	}
	291
2c66daec TE	292	int digital_target_found(struct nfc_digital_dev *ddev,
	293	struct nfc_target *target, u8 protocol)
	294	{
	295	int rc;
	296	u8 framing;
	297	u8 rf_tech;
	298	int (check_crc)(struct sk_buff skb);
	299	void (add_crc)(struct sk_buff skb);
	300
	301	rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech;
	302
	303	switch (protocol) {
	304	case NFC_PROTO_JEWEL:
	305	framing = NFC_DIGITAL_FRAMING_NFCA_T1T;
	306	check_crc = digital_skb_check_crc_b;
	307	add_crc = digital_skb_add_crc_b;
	308	break;
	309
	310	case NFC_PROTO_MIFARE:
	311	framing = NFC_DIGITAL_FRAMING_NFCA_T2T;
	312	check_crc = digital_skb_check_crc_a;
	313	add_crc = digital_skb_add_crc_a;
	314	break;
	315
8c0695e4 TE	316	case NFC_PROTO_FELICA:
	317	framing = NFC_DIGITAL_FRAMING_NFCF_T3T;
	318	check_crc = digital_skb_check_crc_f;
	319	add_crc = digital_skb_add_crc_f;
	320	break;
	321
7d0911c0 TE	322	case NFC_PROTO_NFC_DEP:
	323	if (rf_tech == NFC_DIGITAL_RF_TECH_106A) {
	324	framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP;
	325	check_crc = digital_skb_check_crc_a;
	326	add_crc = digital_skb_add_crc_a;
	327	} else {
	328	framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP;
	329	check_crc = digital_skb_check_crc_f;
	330	add_crc = digital_skb_add_crc_f;
	331	}
	332	break;
	333
2c66daec	334	default:
26042530	335	pr_err("Invalid protocol %d\n", protocol);
2c66daec TE	336	return -EINVAL;
	337	}
	338
26042530	339	pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol);
2c66daec TE	340
2c66daec TE	341	ddev->curr_rf_tech = rf_tech;
2c66daec TE	342
	343	if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
	344	ddev->skb_add_crc = digital_skb_add_crc_none;
	345	ddev->skb_check_crc = digital_skb_check_crc_none;
	346	} else {
	347	ddev->skb_add_crc = add_crc;
	348	ddev->skb_check_crc = check_crc;
	349	}
	350
	351	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing);
	352	if (rc)
	353	return rc;
	354
	355	target->supported_protocols = (1 << protocol);
	356	rc = nfc_targets_found(ddev->nfc_dev, target, 1);
	357	if (rc)
	358	return rc;
	359
	360	ddev->poll_tech_count = 0;
	361
	362	return 0;
	363	}
	364
59ee2361 TE	365	void digital_poll_next_tech(struct nfc_digital_dev *ddev)
	366	{
	367	digital_switch_rf(ddev, 0);
	368
	369	mutex_lock(&ddev->poll_lock);
	370
	371	if (!ddev->poll_tech_count) {
	372	mutex_unlock(&ddev->poll_lock);
	373	return;
	374	}
	375
	376	ddev->poll_tech_index = (ddev->poll_tech_index + 1) %
	377	ddev->poll_tech_count;
	378
	379	mutex_unlock(&ddev->poll_lock);
	380
	381	schedule_work(&ddev->poll_work);
	382	}
	383
	384	static void digital_wq_poll(struct work_struct *work)
	385	{
	386	int rc;
	387	struct digital_poll_tech *poll_tech;
	388	struct nfc_digital_dev *ddev = container_of(work,
	389	struct nfc_digital_dev,
	390	poll_work);
	391	mutex_lock(&ddev->poll_lock);
	392
	393	if (!ddev->poll_tech_count) {
	394	mutex_unlock(&ddev->poll_lock);
	395	return;
	396	}
	397
	398	poll_tech = &ddev->poll_techs[ddev->poll_tech_index];
	399
	400	mutex_unlock(&ddev->poll_lock);
	401
	402	rc = poll_tech->poll_func(ddev, poll_tech->rf_tech);
	403	if (rc)
	404	digital_poll_next_tech(ddev);
	405	}
	406
	407	static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech,
	408	digital_poll_t poll_func)
	409	{
	410	struct digital_poll_tech *poll_tech;
	411
	412	if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX)
	413	return;
	414
	415	poll_tech = &ddev->poll_techs[ddev->poll_tech_count++];
	416
	417	poll_tech->rf_tech = rf_tech;
	418	poll_tech->poll_func = poll_func;
	419	}
	420
	421	/**
	422	* start_poll operation
	423	*
	424	* For every supported protocol, the corresponding polling function is added
	425	* to the table of polling technologies (ddev->poll_techs[]) using
	426	* digital_add_poll_tech().
	427	* When a polling function fails (by timeout or protocol error) the next one is
	428	* schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work).
429	*/
4b10884e TE	430	static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
	431	__u32 tm_protocols)
	432	{
59ee2361 TE	433	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	434	u32 matching_im_protocols, matching_tm_protocols;
	435
26042530	436	pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols,
c5da0e4a	437	tm_protocols, ddev->protocols);
59ee2361 TE	438
	439	matching_im_protocols = ddev->protocols & im_protocols;
	440	matching_tm_protocols = ddev->protocols & tm_protocols;
	441
	442	if (!matching_im_protocols && !matching_tm_protocols) {
26042530	443	pr_err("Unknown protocol\n");
59ee2361 TE	444	return -EINVAL;
	445	}
	446
	447	if (ddev->poll_tech_count) {
26042530	448	pr_err("Already polling\n");
59ee2361 TE	449	return -EBUSY;
	450	}
	451
	452	if (ddev->curr_protocol) {
26042530	453	pr_err("A target is already active\n");
59ee2361 TE	454	return -EBUSY;
	455	}
	456
	457	ddev->poll_tech_count = 0;
	458	ddev->poll_tech_index = 0;
	459
	460	if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH)
	461	digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
	462	digital_in_send_sens_req);
	463
8c0695e4 TE	464	if (im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) {
	465	digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
	466	digital_in_send_sensf_req);
	467
	468	digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
	469	digital_in_send_sensf_req);
	470	}
	471
1c7a4c24 TE	472	if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
	473	if (ddev->ops->tg_listen_mdaa) {
	474	digital_add_poll_tech(ddev, 0,
	475	digital_tg_listen_mdaa);
	476	} else {
	477	digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
	478	digital_tg_listen_nfca);
	479
	480	digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
	481	digital_tg_listen_nfcf);
	482
	483	digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
	484	digital_tg_listen_nfcf);
	485	}
	486	}
	487
59ee2361	488	if (!ddev->poll_tech_count) {
26042530	489	pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n",
59ee2361 TE	490	matching_im_protocols, matching_tm_protocols);
	491	return -EINVAL;
	492	}
	493
	494	schedule_work(&ddev->poll_work);
	495
	496	return 0;
4b10884e TE	497	}
	498
	499	static void digital_stop_poll(struct nfc_dev *nfc_dev)
	500	{
59ee2361 TE	501	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	502
	503	mutex_lock(&ddev->poll_lock);
	504
	505	if (!ddev->poll_tech_count) {
26042530	506	pr_err("Polling operation was not running\n");
59ee2361 TE	507	mutex_unlock(&ddev->poll_lock);
	508	return;
	509	}
	510
	511	ddev->poll_tech_count = 0;
	512
	513	mutex_unlock(&ddev->poll_lock);
	514
	515	cancel_work_sync(&ddev->poll_work);
	516
	517	digital_abort_cmd(ddev);
4b10884e TE	518	}
	519
	520	static int digital_dev_up(struct nfc_dev *nfc_dev)
	521	{
59ee2361 TE	522	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	523
	524	digital_switch_rf(ddev, 1);
	525
	526	return 0;
4b10884e TE	527	}
	528
	529	static int digital_dev_down(struct nfc_dev *nfc_dev)
	530	{
59ee2361 TE	531	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	532
	533	digital_switch_rf(ddev, 0);
	534
	535	return 0;
4b10884e TE	536	}
	537
	538	static int digital_dep_link_up(struct nfc_dev *nfc_dev,
	539	struct nfc_target *target,
	540	__u8 comm_mode, __u8 *gb, size_t gb_len)
	541	{
7d0911c0	542	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
48e10445 TE	543	int rc;
	544
	545	rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
7d0911c0	546
48e10445 TE	547	if (!rc)
	548	ddev->curr_protocol = NFC_PROTO_NFC_DEP;
	549
	550	return rc;
4b10884e TE	551	}
	552
	553	static int digital_dep_link_down(struct nfc_dev *nfc_dev)
	554	{
7d0911c0 TE	555	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	556
	557	ddev->curr_protocol = 0;
	558
	559	return 0;
4b10884e TE	560	}
	561
	562	static int digital_activate_target(struct nfc_dev *nfc_dev,
	563	struct nfc_target *target, __u32 protocol)
	564	{
48e10445 TE	565	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	566
	567	if (ddev->poll_tech_count) {
	568	pr_err("Can't activate a target while polling\n");
	569	return -EBUSY;
	570	}
	571
	572	if (ddev->curr_protocol) {
	573	pr_err("A target is already active\n");
	574	return -EBUSY;
	575	}
	576
	577	ddev->curr_protocol = protocol;
	578
59ee2361	579	return 0;
4b10884e TE	580	}
	581
	582	static void digital_deactivate_target(struct nfc_dev *nfc_dev,
	583	struct nfc_target *target)
	584	{
59ee2361 TE	585	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
59ee2361 TE	586
48e10445 TE	587	if (!ddev->curr_protocol) {
	588	pr_err("No active target\n");
	589	return;
	590	}
	591
59ee2361	592	ddev->curr_protocol = 0;
4b10884e TE	593	}
	594
	595	static int digital_tg_send(struct nfc_dev dev, struct sk_buff skb)
	596	{
1c7a4c24 TE	597	struct nfc_digital_dev *ddev = nfc_get_drvdata(dev);
	598
	599	return digital_tg_send_dep_res(ddev, skb);
4b10884e TE	600	}
4b10884e TE	601
2c66daec TE	602	static void digital_in_send_complete(struct nfc_digital_dev ddev, void arg,
	603	struct sk_buff *resp)
	604	{
	605	struct digital_data_exch *data_exch = arg;
	606	int rc;
	607
	608	if (IS_ERR(resp)) {
	609	rc = PTR_ERR(resp);
	610	goto done;
	611	}
	612
	613	if (ddev->curr_protocol == NFC_PROTO_MIFARE)
	614	rc = digital_in_recv_mifare_res(resp);
	615	else
	616	rc = ddev->skb_check_crc(resp);
	617
	618	if (rc) {
	619	kfree_skb(resp);
	620	resp = NULL;
	621	}
	622
	623	done:
	624	data_exch->cb(data_exch->cb_context, resp, rc);
	625
	626	kfree(data_exch);
	627	}
	628
4b10884e TE	629	static int digital_in_send(struct nfc_dev nfc_dev, struct nfc_target target,
	630	struct sk_buff *skb, data_exchange_cb_t cb,
	631	void *cb_context)
	632	{
2c66daec TE	633	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	634	struct digital_data_exch *data_exch;
	635
	636	data_exch = kzalloc(sizeof(struct digital_data_exch), GFP_KERNEL);
	637	if (!data_exch) {
26042530	638	pr_err("Failed to allocate data_exch struct\n");
2c66daec TE	639	return -ENOMEM;
	640	}
	641
	642	data_exch->cb = cb;
	643	data_exch->cb_context = cb_context;
	644
7d0911c0 TE	645	if (ddev->curr_protocol == NFC_PROTO_NFC_DEP)
	646	return digital_in_send_dep_req(ddev, target, skb, data_exch);
	647
2c66daec TE	648	ddev->skb_add_crc(skb);
	649
	650	return digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete,
	651	data_exch);
4b10884e TE	652	}
	653
	654	static struct nfc_ops digital_nfc_ops = {
	655	.dev_up = digital_dev_up,
	656	.dev_down = digital_dev_down,
	657	.start_poll = digital_start_poll,
	658	.stop_poll = digital_stop_poll,
	659	.dep_link_up = digital_dep_link_up,
	660	.dep_link_down = digital_dep_link_down,
	661	.activate_target = digital_activate_target,
	662	.deactivate_target = digital_deactivate_target,
	663	.tm_send = digital_tg_send,
	664	.im_transceive = digital_in_send,
	665	};
	666
	667	struct nfc_digital_dev nfc_digital_allocate_device(struct nfc_digital_ops ops,
	668	__u32 supported_protocols,
	669	__u32 driver_capabilities,
	670	int tx_headroom, int tx_tailroom)
	671	{
	672	struct nfc_digital_dev *ddev;
	673
	674	if (!ops->in_configure_hw \|\| !ops->in_send_cmd \|\| !ops->tg_listen \|\|
	675	!ops->tg_configure_hw \|\| !ops->tg_send_cmd \|\| !ops->abort_cmd \|\|
	676	!ops->switch_rf)
	677	return NULL;
	678
	679	ddev = kzalloc(sizeof(struct nfc_digital_dev), GFP_KERNEL);
26042530	680	if (!ddev)
4b10884e	681	return NULL;
4b10884e TE	682
	683	ddev->driver_capabilities = driver_capabilities;
	684	ddev->ops = ops;
	685
59ee2361 TE	686	mutex_init(&ddev->cmd_lock);
	687	INIT_LIST_HEAD(&ddev->cmd_queue);
	688
	689	INIT_WORK(&ddev->cmd_work, digital_wq_cmd);
	690	INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete);
	691
	692	mutex_init(&ddev->poll_lock);
	693	INIT_WORK(&ddev->poll_work, digital_wq_poll);
	694
	695	if (supported_protocols & NFC_PROTO_JEWEL_MASK)
	696	ddev->protocols \|= NFC_PROTO_JEWEL_MASK;
	697	if (supported_protocols & NFC_PROTO_MIFARE_MASK)
	698	ddev->protocols \|= NFC_PROTO_MIFARE_MASK;
8c0695e4 TE	699	if (supported_protocols & NFC_PROTO_FELICA_MASK)
8c0695e4 TE	700	ddev->protocols \|= NFC_PROTO_FELICA_MASK;
7d0911c0 TE	701	if (supported_protocols & NFC_PROTO_NFC_DEP_MASK)
7d0911c0 TE	702	ddev->protocols \|= NFC_PROTO_NFC_DEP_MASK;
59ee2361 TE	703
	704	ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
	705	ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;
4b10884e TE	706
	707	ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols,
	708	ddev->tx_headroom,
	709	ddev->tx_tailroom);
	710	if (!ddev->nfc_dev) {
26042530	711	pr_err("nfc_allocate_device failed\n");
4b10884e TE	712	goto free_dev;
	713	}
	714
	715	nfc_set_drvdata(ddev->nfc_dev, ddev);
	716
	717	return ddev;
	718
	719	free_dev:
	720	kfree(ddev);
	721
	722	return NULL;
	723	}
	724	EXPORT_SYMBOL(nfc_digital_allocate_device);
	725
	726	void nfc_digital_free_device(struct nfc_digital_dev *ddev)
	727	{
	728	nfc_free_device(ddev->nfc_dev);
4b10884e TE	729	kfree(ddev);
	730	}
	731	EXPORT_SYMBOL(nfc_digital_free_device);
	732
	733	int nfc_digital_register_device(struct nfc_digital_dev *ddev)
	734	{
	735	return nfc_register_device(ddev->nfc_dev);
	736	}
	737	EXPORT_SYMBOL(nfc_digital_register_device);
	738
	739	void nfc_digital_unregister_device(struct nfc_digital_dev *ddev)
	740	{
59ee2361 TE	741	struct digital_cmd cmd, n;
59ee2361 TE	742
4b10884e	743	nfc_unregister_device(ddev->nfc_dev);
59ee2361 TE	744
	745	mutex_lock(&ddev->poll_lock);
	746	ddev->poll_tech_count = 0;
	747	mutex_unlock(&ddev->poll_lock);
	748
	749	cancel_work_sync(&ddev->poll_work);
	750	cancel_work_sync(&ddev->cmd_work);
	751	cancel_work_sync(&ddev->cmd_complete_work);
	752
	753	list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) {
	754	list_del(&cmd->queue);
1c7a4c24	755	kfree(cmd->mdaa_params);
59ee2361 TE	756	kfree(cmd);
59ee2361 TE	757	}
4b10884e TE	758	}
	759	EXPORT_SYMBOL(nfc_digital_unregister_device);
	760
	761	MODULE_LICENSE("GPL");