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Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that 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 you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that 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 [based] [from] [clk] [highbank] [c] you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 355 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Jilayne Lovejoy <opensource@jilayne.com> Reviewed-by: Steve Winslow <swinslow@gmail.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190519154041.837383322@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
277 lines
5.9 KiB
C
277 lines
5.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for NXP PN533 NFC Chip - I2C transport layer
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*
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* Copyright (C) 2011 Instituto Nokia de Tecnologia
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* Copyright (C) 2012-2013 Tieto Poland
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* Copyright (C) 2016 HALE electronic
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*/
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/nfc.h>
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#include <linux/netdevice.h>
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#include <linux/interrupt.h>
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#include <net/nfc/nfc.h>
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#include "pn533.h"
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#define VERSION "0.1"
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#define PN533_I2C_DRIVER_NAME "pn533_i2c"
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struct pn533_i2c_phy {
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struct i2c_client *i2c_dev;
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struct pn533 *priv;
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bool aborted;
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int hard_fault; /*
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* < 0 if hardware error occurred (e.g. i2c err)
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* and prevents normal operation.
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*/
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};
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static int pn533_i2c_send_ack(struct pn533 *dev, gfp_t flags)
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{
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struct pn533_i2c_phy *phy = dev->phy;
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struct i2c_client *client = phy->i2c_dev;
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static const u8 ack[6] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
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/* spec 6.2.1.3: Preamble, SoPC (2), ACK Code (2), Postamble */
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int rc;
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rc = i2c_master_send(client, ack, 6);
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return rc;
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}
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static int pn533_i2c_send_frame(struct pn533 *dev,
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struct sk_buff *out)
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{
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struct pn533_i2c_phy *phy = dev->phy;
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struct i2c_client *client = phy->i2c_dev;
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int rc;
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if (phy->hard_fault != 0)
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return phy->hard_fault;
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if (phy->priv == NULL)
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phy->priv = dev;
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phy->aborted = false;
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print_hex_dump_debug("PN533_i2c TX: ", DUMP_PREFIX_NONE, 16, 1,
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out->data, out->len, false);
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rc = i2c_master_send(client, out->data, out->len);
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if (rc == -EREMOTEIO) { /* Retry, chip was in power down */
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usleep_range(6000, 10000);
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rc = i2c_master_send(client, out->data, out->len);
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}
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if (rc >= 0) {
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if (rc != out->len)
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rc = -EREMOTEIO;
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else
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rc = 0;
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}
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return rc;
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}
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static void pn533_i2c_abort_cmd(struct pn533 *dev, gfp_t flags)
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{
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struct pn533_i2c_phy *phy = dev->phy;
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phy->aborted = true;
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/* An ack will cancel the last issued command */
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pn533_i2c_send_ack(dev, flags);
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/* schedule cmd_complete_work to finish current command execution */
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pn533_recv_frame(phy->priv, NULL, -ENOENT);
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}
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static int pn533_i2c_read(struct pn533_i2c_phy *phy, struct sk_buff **skb)
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{
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struct i2c_client *client = phy->i2c_dev;
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int len = PN533_EXT_FRAME_HEADER_LEN +
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PN533_STD_FRAME_MAX_PAYLOAD_LEN +
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PN533_STD_FRAME_TAIL_LEN + 1;
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int r;
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*skb = alloc_skb(len, GFP_KERNEL);
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if (*skb == NULL)
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return -ENOMEM;
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r = i2c_master_recv(client, skb_put(*skb, len), len);
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if (r != len) {
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nfc_err(&client->dev, "cannot read. r=%d len=%d\n", r, len);
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kfree_skb(*skb);
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return -EREMOTEIO;
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}
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if (!((*skb)->data[0] & 0x01)) {
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nfc_err(&client->dev, "READY flag not set");
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kfree_skb(*skb);
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return -EBUSY;
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}
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/* remove READY byte */
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skb_pull(*skb, 1);
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/* trim to frame size */
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skb_trim(*skb, phy->priv->ops->rx_frame_size((*skb)->data));
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return 0;
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}
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static irqreturn_t pn533_i2c_irq_thread_fn(int irq, void *data)
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{
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struct pn533_i2c_phy *phy = data;
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struct i2c_client *client;
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struct sk_buff *skb = NULL;
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int r;
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if (!phy || irq != phy->i2c_dev->irq) {
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WARN_ON_ONCE(1);
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return IRQ_NONE;
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}
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client = phy->i2c_dev;
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dev_dbg(&client->dev, "IRQ\n");
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if (phy->hard_fault != 0)
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return IRQ_HANDLED;
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r = pn533_i2c_read(phy, &skb);
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if (r == -EREMOTEIO) {
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phy->hard_fault = r;
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pn533_recv_frame(phy->priv, NULL, -EREMOTEIO);
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return IRQ_HANDLED;
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} else if ((r == -ENOMEM) || (r == -EBADMSG) || (r == -EBUSY)) {
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return IRQ_HANDLED;
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}
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if (!phy->aborted)
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pn533_recv_frame(phy->priv, skb, 0);
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return IRQ_HANDLED;
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}
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static struct pn533_phy_ops i2c_phy_ops = {
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.send_frame = pn533_i2c_send_frame,
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.send_ack = pn533_i2c_send_ack,
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.abort_cmd = pn533_i2c_abort_cmd,
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};
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static int pn533_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct pn533_i2c_phy *phy;
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struct pn533 *priv;
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int r = 0;
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dev_dbg(&client->dev, "%s\n", __func__);
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dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
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return -ENODEV;
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}
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phy = devm_kzalloc(&client->dev, sizeof(struct pn533_i2c_phy),
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GFP_KERNEL);
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if (!phy)
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return -ENOMEM;
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phy->i2c_dev = client;
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i2c_set_clientdata(client, phy);
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priv = pn533_register_device(PN533_DEVICE_PN532,
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PN533_NO_TYPE_B_PROTOCOLS,
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PN533_PROTO_REQ_ACK_RESP,
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phy, &i2c_phy_ops, NULL,
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&phy->i2c_dev->dev,
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&client->dev);
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if (IS_ERR(priv)) {
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r = PTR_ERR(priv);
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return r;
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}
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phy->priv = priv;
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r = request_threaded_irq(client->irq, NULL, pn533_i2c_irq_thread_fn,
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IRQF_TRIGGER_FALLING |
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IRQF_SHARED | IRQF_ONESHOT,
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PN533_I2C_DRIVER_NAME, phy);
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if (r < 0) {
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nfc_err(&client->dev, "Unable to register IRQ handler\n");
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goto irq_rqst_err;
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}
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r = pn533_finalize_setup(priv);
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if (r)
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goto fn_setup_err;
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return 0;
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fn_setup_err:
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free_irq(client->irq, phy);
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irq_rqst_err:
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pn533_unregister_device(phy->priv);
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return r;
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}
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static int pn533_i2c_remove(struct i2c_client *client)
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{
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struct pn533_i2c_phy *phy = i2c_get_clientdata(client);
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dev_dbg(&client->dev, "%s\n", __func__);
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free_irq(client->irq, phy);
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pn533_unregister_device(phy->priv);
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return 0;
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}
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static const struct of_device_id of_pn533_i2c_match[] = {
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{ .compatible = "nxp,pn533-i2c", },
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{ .compatible = "nxp,pn532-i2c", },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_pn533_i2c_match);
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static const struct i2c_device_id pn533_i2c_id_table[] = {
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{ PN533_I2C_DRIVER_NAME, 0 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, pn533_i2c_id_table);
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static struct i2c_driver pn533_i2c_driver = {
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.driver = {
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.name = PN533_I2C_DRIVER_NAME,
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(of_pn533_i2c_match),
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},
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.probe = pn533_i2c_probe,
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.id_table = pn533_i2c_id_table,
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.remove = pn533_i2c_remove,
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};
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module_i2c_driver(pn533_i2c_driver);
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MODULE_AUTHOR("Michael Thalmeier <michael.thalmeier@hale.at>");
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MODULE_DESCRIPTION("PN533 I2C driver ver " VERSION);
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MODULE_VERSION(VERSION);
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MODULE_LICENSE("GPL");
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