NFC: pn533: add I2C phy driver
This adds the I2C phy interface for the pn533 driver. This way the driver can be used to interact with I2C connected pn532 devices. Signed-off-by: Michael Thalmeier <michael.thalmeier@hale.at> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Michael Thalmeier
Samuel Ortiz
parent
9815c7cf22
commit
dd7bedcd26
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@ -14,3 +14,14 @@ config NFC_PN533_USB
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If you choose to build a module, it'll be called pn533_usb.
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Say N if unsure.
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config NFC_PN533_I2C
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tristate "NFC PN533 device support (I2C)"
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depends on I2C
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select NFC_PN533
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---help---
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This module adds support for the NXP pn533 I2C interface.
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Select this if your platform is using the I2C bus.
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If you choose to build a module, it'll be called pn533_i2c.
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Say N if unsure.
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@ -2,6 +2,8 @@
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# Makefile for PN533 NFC driver
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#
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pn533_usb-objs = usb.o
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pn533_i2c-objs = i2c.o
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obj-$(CONFIG_NFC_PN533) += pn533.o
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obj-$(CONFIG_NFC_PN533_USB) += pn533_usb.o
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obj-$(CONFIG_NFC_PN533_I2C) += pn533_i2c.o
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@ -0,0 +1,271 @@
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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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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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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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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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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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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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/* 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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if (dev->cmd != NULL)
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dev->cmd->status = -ENOENT;
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queue_work(dev->wq, &dev->cmd_complete_work);
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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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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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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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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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if (IS_ERR(priv)) {
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r = PTR_ERR(priv);
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goto err_register;
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}
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phy->priv = priv;
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return 0;
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err_register:
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free_irq(client->irq, phy);
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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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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 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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@ -2427,8 +2427,37 @@ static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
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return rc;
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}
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static int pn532_sam_configuration(struct nfc_dev *nfc_dev)
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{
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struct pn533 *dev = nfc_get_drvdata(nfc_dev);
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struct sk_buff *skb;
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struct sk_buff *resp;
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skb = pn533_alloc_skb(dev, 1);
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if (!skb)
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return -ENOMEM;
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*skb_put(skb, 1) = 0x01;
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resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb);
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if (IS_ERR(resp))
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return PTR_ERR(resp);
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dev_kfree_skb(resp);
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return 0;
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}
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static int pn533_dev_up(struct nfc_dev *nfc_dev)
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{
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struct pn533 *dev = nfc_get_drvdata(nfc_dev);
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if (dev->device_type == PN533_DEVICE_PN532) {
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int rc = pn532_sam_configuration(nfc_dev);
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if (rc)
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return rc;
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}
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return pn533_rf_field(nfc_dev, 1);
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}
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@ -2461,6 +2490,7 @@ static int pn533_setup(struct pn533 *dev)
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case PN533_DEVICE_STD:
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case PN533_DEVICE_PASORI:
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case PN533_DEVICE_ACR122U:
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case PN533_DEVICE_PN532:
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max_retries.mx_rty_atr = 0x2;
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max_retries.mx_rty_psl = 0x1;
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max_retries.mx_rty_passive_act =
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@ -2496,6 +2526,7 @@ static int pn533_setup(struct pn533 *dev)
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switch (dev->device_type) {
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case PN533_DEVICE_STD:
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case PN533_DEVICE_PN532:
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break;
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case PN533_DEVICE_PASORI:
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@ -21,6 +21,7 @@
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#define PN533_DEVICE_STD 0x1
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#define PN533_DEVICE_PASORI 0x2
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#define PN533_DEVICE_ACR122U 0x3
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#define PN533_DEVICE_PN532 0x4
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#define PN533_ALL_PROTOCOLS (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK |\
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NFC_PROTO_FELICA_MASK | NFC_PROTO_ISO14443_MASK |\
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@ -73,6 +74,7 @@
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#define PN533_FRAME_CMD(f) (f->data[1])
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#define PN533_CMD_GET_FIRMWARE_VERSION 0x02
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#define PN533_CMD_SAM_CONFIGURATION 0x14
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#define PN533_CMD_RF_CONFIGURATION 0x32
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#define PN533_CMD_IN_DATA_EXCHANGE 0x40
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#define PN533_CMD_IN_COMM_THRU 0x42
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