diff options
author | Michael Thalmeier <michael.thalmeier@hale.at> | 2016-03-25 15:46:54 +0100 |
---|---|---|
committer | Samuel Ortiz <sameo@linux.intel.com> | 2016-04-09 23:53:20 +0200 |
commit | dd7bedcd2673e4c8957d15d7e6e649fc6fa40206 (patch) | |
tree | dbe51f2048ed438bf00b95e068ba8601bc05265f /drivers/nfc | |
parent | NFC: pn533: Separate physical layer from the core implementation (diff) | |
download | linux-dd7bedcd2673e4c8957d15d7e6e649fc6fa40206.tar.xz linux-dd7bedcd2673e4c8957d15d7e6e649fc6fa40206.zip |
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>
Diffstat (limited to 'drivers/nfc')
-rw-r--r-- | drivers/nfc/pn533/Kconfig | 11 | ||||
-rw-r--r-- | drivers/nfc/pn533/Makefile | 2 | ||||
-rw-r--r-- | drivers/nfc/pn533/i2c.c | 271 | ||||
-rw-r--r-- | drivers/nfc/pn533/pn533.c | 31 | ||||
-rw-r--r-- | drivers/nfc/pn533/pn533.h | 2 |
5 files changed, 317 insertions, 0 deletions
diff --git a/drivers/nfc/pn533/Kconfig b/drivers/nfc/pn533/Kconfig index b5a926e42f7b..d94122dd30e4 100644 --- a/drivers/nfc/pn533/Kconfig +++ b/drivers/nfc/pn533/Kconfig @@ -14,3 +14,14 @@ config NFC_PN533_USB If you choose to build a module, it'll be called pn533_usb. Say N if unsure. + +config NFC_PN533_I2C + tristate "NFC PN533 device support (I2C)" + depends on I2C + select NFC_PN533 + ---help--- + This module adds support for the NXP pn533 I2C interface. + Select this if your platform is using the I2C bus. + + If you choose to build a module, it'll be called pn533_i2c. + Say N if unsure. diff --git a/drivers/nfc/pn533/Makefile b/drivers/nfc/pn533/Makefile index 12c6be481483..51d24c622fcb 100644 --- a/drivers/nfc/pn533/Makefile +++ b/drivers/nfc/pn533/Makefile @@ -2,6 +2,8 @@ # Makefile for PN533 NFC driver # pn533_usb-objs = usb.o +pn533_i2c-objs = i2c.o obj-$(CONFIG_NFC_PN533) += pn533.o obj-$(CONFIG_NFC_PN533_USB) += pn533_usb.o +obj-$(CONFIG_NFC_PN533_I2C) += pn533_i2c.o diff --git a/drivers/nfc/pn533/i2c.c b/drivers/nfc/pn533/i2c.c new file mode 100644 index 000000000000..9679aa52c381 --- /dev/null +++ b/drivers/nfc/pn533/i2c.c @@ -0,0 +1,271 @@ +/* + * Driver for NXP PN533 NFC Chip - I2C transport layer + * + * Copyright (C) 2011 Instituto Nokia de Tecnologia + * Copyright (C) 2012-2013 Tieto Poland + * Copyright (C) 2016 HALE electronic + * + * + * 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/>. + */ + +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/i2c.h> +#include <linux/nfc.h> +#include <linux/netdevice.h> +#include <linux/interrupt.h> +#include <net/nfc/nfc.h> +#include "pn533.h" + +#define VERSION "0.1" + +#define PN533_I2C_DRIVER_NAME "pn533_i2c" + +struct pn533_i2c_phy { + struct i2c_client *i2c_dev; + struct pn533 *priv; + + int hard_fault; /* + * < 0 if hardware error occurred (e.g. i2c err) + * and prevents normal operation. + */ +}; + +static int pn533_i2c_send_ack(struct pn533 *dev, gfp_t flags) +{ + struct pn533_i2c_phy *phy = dev->phy; + struct i2c_client *client = phy->i2c_dev; + u8 ack[6] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00}; + /* spec 6.2.1.3: Preamble, SoPC (2), ACK Code (2), Postamble */ + int rc; + + rc = i2c_master_send(client, ack, 6); + + return rc; +} + +static int pn533_i2c_send_frame(struct pn533 *dev, + struct sk_buff *out) +{ + struct pn533_i2c_phy *phy = dev->phy; + struct i2c_client *client = phy->i2c_dev; + int rc; + + if (phy->hard_fault != 0) + return phy->hard_fault; + + if (phy->priv == NULL) + phy->priv = dev; + + print_hex_dump_debug("PN533_i2c TX: ", DUMP_PREFIX_NONE, 16, 1, + out->data, out->len, false); + + rc = i2c_master_send(client, out->data, out->len); + + if (rc == -EREMOTEIO) { /* Retry, chip was in power down */ + usleep_range(6000, 10000); + rc = i2c_master_send(client, out->data, out->len); + } + + if (rc >= 0) { + if (rc != out->len) + rc = -EREMOTEIO; + else + rc = 0; + } + + return rc; +} + +static void pn533_i2c_abort_cmd(struct pn533 *dev, gfp_t flags) +{ + /* An ack will cancel the last issued command */ + pn533_i2c_send_ack(dev, flags); + + /* schedule cmd_complete_work to finish current command execution */ + if (dev->cmd != NULL) + dev->cmd->status = -ENOENT; + queue_work(dev->wq, &dev->cmd_complete_work); +} + +static int pn533_i2c_read(struct pn533_i2c_phy *phy, struct sk_buff **skb) +{ + struct i2c_client *client = phy->i2c_dev; + int len = PN533_EXT_FRAME_HEADER_LEN + + PN533_STD_FRAME_MAX_PAYLOAD_LEN + + PN533_STD_FRAME_TAIL_LEN + 1; + int r; + + *skb = alloc_skb(len, GFP_KERNEL); + if (*skb == NULL) + return -ENOMEM; + + r = i2c_master_recv(client, skb_put(*skb, len), len); + if (r != len) { + nfc_err(&client->dev, "cannot read. r=%d len=%d\n", r, len); + kfree_skb(*skb); + return -EREMOTEIO; + } + + if (!((*skb)->data[0] & 0x01)) { + nfc_err(&client->dev, "READY flag not set"); + kfree_skb(*skb); + return -EBUSY; + } + + /* remove READY byte */ + skb_pull(*skb, 1); + /* trim to frame size */ + skb_trim(*skb, phy->priv->ops->rx_frame_size((*skb)->data)); + + return 0; +} + +static irqreturn_t pn533_i2c_irq_thread_fn(int irq, void *data) +{ + struct pn533_i2c_phy *phy = data; + struct i2c_client *client; + struct sk_buff *skb = NULL; + int r; + + if (!phy || irq != phy->i2c_dev->irq) { + WARN_ON_ONCE(1); + return IRQ_NONE; + } + + client = phy->i2c_dev; + dev_dbg(&client->dev, "IRQ\n"); + + if (phy->hard_fault != 0) + return IRQ_HANDLED; + + r = pn533_i2c_read(phy, &skb); + if (r == -EREMOTEIO) { + phy->hard_fault = r; + + pn533_recv_frame(phy->priv, NULL, -EREMOTEIO); + + return IRQ_HANDLED; + } else if ((r == -ENOMEM) || (r == -EBADMSG) || (r == -EBUSY)) { + return IRQ_HANDLED; + } + + pn533_recv_frame(phy->priv, skb, 0); + + return IRQ_HANDLED; +} + +static struct pn533_phy_ops i2c_phy_ops = { + .send_frame = pn533_i2c_send_frame, + .send_ack = pn533_i2c_send_ack, + .abort_cmd = pn533_i2c_abort_cmd, +}; + + +static int pn533_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct pn533_i2c_phy *phy; + struct pn533 *priv; + int r = 0; + + dev_dbg(&client->dev, "%s\n", __func__); + dev_dbg(&client->dev, "IRQ: %d\n", client->irq); + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { + nfc_err(&client->dev, "Need I2C_FUNC_I2C\n"); + return -ENODEV; + } + + phy = devm_kzalloc(&client->dev, sizeof(struct pn533_i2c_phy), + GFP_KERNEL); + if (!phy) + return -ENOMEM; + + phy->i2c_dev = client; + i2c_set_clientdata(client, phy); + + r = request_threaded_irq(client->irq, NULL, pn533_i2c_irq_thread_fn, + IRQF_TRIGGER_FALLING | + IRQF_SHARED | IRQF_ONESHOT, + PN533_I2C_DRIVER_NAME, phy); + + if (r < 0) + nfc_err(&client->dev, "Unable to register IRQ handler\n"); + + priv = pn533_register_device(PN533_DEVICE_PN532, + PN533_NO_TYPE_B_PROTOCOLS, + PN533_PROTO_REQ_ACK_RESP, + phy, &i2c_phy_ops, NULL, + &phy->i2c_dev->dev); + + if (IS_ERR(priv)) { + r = PTR_ERR(priv); + goto err_register; + } + + phy->priv = priv; + + return 0; + +err_register: + free_irq(client->irq, phy); + + return r; +} + +static int pn533_i2c_remove(struct i2c_client *client) +{ + struct pn533_i2c_phy *phy = i2c_get_clientdata(client); + + dev_dbg(&client->dev, "%s\n", __func__); + + pn533_unregister_device(phy->priv); + + return 0; +} + +static const struct of_device_id of_pn533_i2c_match[] = { + { .compatible = "nxp,pn533-i2c", }, + { .compatible = "nxp,pn532-i2c", }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_pn533_i2c_match); + +static struct i2c_device_id pn533_i2c_id_table[] = { + { PN533_I2C_DRIVER_NAME, 0 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, pn533_i2c_id_table); + +static struct i2c_driver pn533_i2c_driver = { + .driver = { + .name = PN533_I2C_DRIVER_NAME, + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(of_pn533_i2c_match), + }, + .probe = pn533_i2c_probe, + .id_table = pn533_i2c_id_table, + .remove = pn533_i2c_remove, +}; + +module_i2c_driver(pn533_i2c_driver); + +MODULE_AUTHOR("Michael Thalmeier <michael.thalmeier@hale.at>"); +MODULE_DESCRIPTION("PN533 I2C driver ver " VERSION); +MODULE_VERSION(VERSION); +MODULE_LICENSE("GPL"); diff --git a/drivers/nfc/pn533/pn533.c b/drivers/nfc/pn533/pn533.c index 52d83fec5add..ee9e8f1195fa 100644 --- a/drivers/nfc/pn533/pn533.c +++ b/drivers/nfc/pn533/pn533.c @@ -2427,8 +2427,37 @@ static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf) return rc; } +static int pn532_sam_configuration(struct nfc_dev *nfc_dev) +{ + struct pn533 *dev = nfc_get_drvdata(nfc_dev); + struct sk_buff *skb; + struct sk_buff *resp; + + skb = pn533_alloc_skb(dev, 1); + if (!skb) + return -ENOMEM; + + *skb_put(skb, 1) = 0x01; + + resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb); + if (IS_ERR(resp)) + return PTR_ERR(resp); + + dev_kfree_skb(resp); + return 0; +} + static int pn533_dev_up(struct nfc_dev *nfc_dev) { + struct pn533 *dev = nfc_get_drvdata(nfc_dev); + + if (dev->device_type == PN533_DEVICE_PN532) { + int rc = pn532_sam_configuration(nfc_dev); + + if (rc) + return rc; + } + return pn533_rf_field(nfc_dev, 1); } @@ -2461,6 +2490,7 @@ static int pn533_setup(struct pn533 *dev) case PN533_DEVICE_STD: case PN533_DEVICE_PASORI: case PN533_DEVICE_ACR122U: + case PN533_DEVICE_PN532: max_retries.mx_rty_atr = 0x2; max_retries.mx_rty_psl = 0x1; max_retries.mx_rty_passive_act = @@ -2496,6 +2526,7 @@ static int pn533_setup(struct pn533 *dev) switch (dev->device_type) { case PN533_DEVICE_STD: + case PN533_DEVICE_PN532: break; case PN533_DEVICE_PASORI: diff --git a/drivers/nfc/pn533/pn533.h b/drivers/nfc/pn533/pn533.h index 1d9f19eb2a99..ba604f6d93f9 100644 --- a/drivers/nfc/pn533/pn533.h +++ b/drivers/nfc/pn533/pn533.h @@ -21,6 +21,7 @@ #define PN533_DEVICE_STD 0x1 #define PN533_DEVICE_PASORI 0x2 #define PN533_DEVICE_ACR122U 0x3 +#define PN533_DEVICE_PN532 0x4 #define PN533_ALL_PROTOCOLS (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK |\ NFC_PROTO_FELICA_MASK | NFC_PROTO_ISO14443_MASK |\ @@ -73,6 +74,7 @@ #define PN533_FRAME_CMD(f) (f->data[1]) #define PN533_CMD_GET_FIRMWARE_VERSION 0x02 +#define PN533_CMD_SAM_CONFIGURATION 0x14 #define PN533_CMD_RF_CONFIGURATION 0x32 #define PN533_CMD_IN_DATA_EXCHANGE 0x40 #define PN533_CMD_IN_COMM_THRU 0x42 |