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-rw-r--r--drivers/nfc/Kconfig2
-rw-r--r--drivers/nfc/Makefile3
-rw-r--r--drivers/nfc/st21nfcb/Kconfig22
-rw-r--r--drivers/nfc/st21nfcb/Makefile8
-rw-r--r--drivers/nfc/st21nfcb/i2c.c462
-rw-r--r--drivers/nfc/st21nfcb/ndlc.c298
-rw-r--r--drivers/nfc/st21nfcb/ndlc.h55
-rw-r--r--drivers/nfc/st21nfcb/st21nfcb.c129
-rw-r--r--drivers/nfc/st21nfcb/st21nfcb.h38
-rw-r--r--include/linux/platform_data/st21nfcb.h32
10 files changed, 1047 insertions, 2 deletions
diff --git a/drivers/nfc/Kconfig b/drivers/nfc/Kconfig
index 26c66a126551..7929fac13e1c 100644
--- a/drivers/nfc/Kconfig
+++ b/drivers/nfc/Kconfig
@@ -72,5 +72,5 @@ source "drivers/nfc/pn544/Kconfig"
source "drivers/nfc/microread/Kconfig"
source "drivers/nfc/nfcmrvl/Kconfig"
source "drivers/nfc/st21nfca/Kconfig"
-
+source "drivers/nfc/st21nfcb/Kconfig"
endmenu
diff --git a/drivers/nfc/Makefile b/drivers/nfc/Makefile
index 23225b0287fd..6b23a2c6e34a 100644
--- a/drivers/nfc/Makefile
+++ b/drivers/nfc/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_NFC_SIM) += nfcsim.o
obj-$(CONFIG_NFC_PORT100) += port100.o
obj-$(CONFIG_NFC_MRVL) += nfcmrvl/
obj-$(CONFIG_NFC_TRF7970A) += trf7970a.o
-obj-$(CONFIG_NFC_ST21NFCA) += st21nfca/
+obj-$(CONFIG_NFC_ST21NFCA) += st21nfca/
+obj-$(CONFIG_NFC_ST21NFCB) += st21nfcb/
ccflags-$(CONFIG_NFC_DEBUG) := -DDEBUG
diff --git a/drivers/nfc/st21nfcb/Kconfig b/drivers/nfc/st21nfcb/Kconfig
new file mode 100644
index 000000000000..e0322dd03a70
--- /dev/null
+++ b/drivers/nfc/st21nfcb/Kconfig
@@ -0,0 +1,22 @@
+config NFC_ST21NFCB
+ tristate "STMicroelectronics ST21NFCB NFC driver"
+ depends on NFC_NCI
+ default n
+ ---help---
+ STMicroelectronics ST21NFCB core driver. It implements the chipset
+ NCI logic and hooks into the NFC kernel APIs. Physical layers will
+ register against it.
+
+ To compile this driver as a module, choose m here. The module will
+ be called st21nfcb.
+ Say N if unsure.
+
+config NFC_ST21NFCB_I2C
+ tristate "NFC ST21NFCB i2c support"
+ depends on NFC_ST21NFCB && I2C
+ ---help---
+ This module adds support for the STMicroelectronics st21nfcb i2c interface.
+ Select this if your platform is using the i2c bus.
+
+ If you choose to build a module, it'll be called st21nfcb_i2c.
+ Say N if unsure.
diff --git a/drivers/nfc/st21nfcb/Makefile b/drivers/nfc/st21nfcb/Makefile
new file mode 100644
index 000000000000..13d9f03b2fea
--- /dev/null
+++ b/drivers/nfc/st21nfcb/Makefile
@@ -0,0 +1,8 @@
+#
+# Makefile for ST21NFCB NCI based NFC driver
+#
+
+st21nfcb_i2c-objs = i2c.o
+
+obj-$(CONFIG_NFC_ST21NFCB) += st21nfcb.o ndlc.o
+obj-$(CONFIG_NFC_ST21NFCB_I2C) += st21nfcb_i2c.o
diff --git a/drivers/nfc/st21nfcb/i2c.c b/drivers/nfc/st21nfcb/i2c.c
new file mode 100644
index 000000000000..0f690baaef7a
--- /dev/null
+++ b/drivers/nfc/st21nfcb/i2c.c
@@ -0,0 +1,462 @@
+/*
+ * I2C Link Layer for ST21NFCB NCI based Driver
+ * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
+ *
+ * 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 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/>.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/crc-ccitt.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/of_irq.h>
+#include <linux/of_gpio.h>
+#include <linux/miscdevice.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/nfc.h>
+#include <linux/firmware.h>
+#include <linux/unaligned/access_ok.h>
+#include <linux/platform_data/st21nfcb.h>
+
+#include <net/nfc/nci.h>
+#include <net/nfc/llc.h>
+#include <net/nfc/nfc.h>
+
+#include "ndlc.h"
+
+#define DRIVER_DESC "NCI NFC driver for ST21NFCB"
+
+/* ndlc header */
+#define ST21NFCB_FRAME_HEADROOM 1
+#define ST21NFCB_FRAME_TAILROOM 0
+
+#define ST21NFCB_NCI_I2C_MIN_SIZE 4 /* PCB(1) + NCI Packet header(3) */
+#define ST21NFCB_NCI_I2C_MAX_SIZE 250 /* req 4.2.1 */
+
+#define ST21NFCB_NCI_I2C_DRIVER_NAME "st21nfcb_nci_i2c"
+
+static struct i2c_device_id st21nfcb_nci_i2c_id_table[] = {
+ {ST21NFCB_NCI_DRIVER_NAME, 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, st21nfcb_nci_i2c_id_table);
+
+struct st21nfcb_i2c_phy {
+ struct i2c_client *i2c_dev;
+ struct llt_ndlc *ndlc;
+
+ unsigned int gpio_irq;
+ unsigned int gpio_reset;
+ unsigned int irq_polarity;
+
+ int powered;
+
+ /*
+ * < 0 if hardware error occured (e.g. i2c err)
+ * and prevents normal operation.
+ */
+ int hard_fault;
+};
+
+#define I2C_DUMP_SKB(info, skb) \
+do { \
+ pr_debug("%s:\n", info); \
+ print_hex_dump(KERN_DEBUG, "i2c: ", DUMP_PREFIX_OFFSET, \
+ 16, 1, (skb)->data, (skb)->len, 0); \
+} while (0)
+
+static int st21nfcb_nci_i2c_enable(void *phy_id)
+{
+ struct st21nfcb_i2c_phy *phy = phy_id;
+
+ gpio_set_value(phy->gpio_reset, 0);
+ usleep_range(10000, 15000);
+ gpio_set_value(phy->gpio_reset, 1);
+ phy->powered = 1;
+ usleep_range(80000, 85000);
+
+ return 0;
+}
+
+static void st21nfcb_nci_i2c_disable(void *phy_id)
+{
+ struct st21nfcb_i2c_phy *phy = phy_id;
+
+ pr_info("\n");
+
+ phy->powered = 0;
+ /* reset chip in order to flush clf */
+ gpio_set_value(phy->gpio_reset, 0);
+ usleep_range(10000, 15000);
+ gpio_set_value(phy->gpio_reset, 1);
+}
+
+static void st21nfcb_nci_remove_header(struct sk_buff *skb)
+{
+ skb_pull(skb, ST21NFCB_FRAME_HEADROOM);
+}
+
+/*
+ * Writing a frame must not return the number of written bytes.
+ * It must return either zero for success, or <0 for error.
+ * In addition, it must not alter the skb
+ */
+static int st21nfcb_nci_i2c_write(void *phy_id, struct sk_buff *skb)
+{
+ int r = -1;
+ struct st21nfcb_i2c_phy *phy = phy_id;
+ struct i2c_client *client = phy->i2c_dev;
+
+ I2C_DUMP_SKB("st21nfcb_nci_i2c_write", skb);
+
+ if (phy->hard_fault != 0)
+ return phy->hard_fault;
+
+ r = i2c_master_send(client, skb->data, skb->len);
+ if (r == -EREMOTEIO) { /* Retry, chip was in standby */
+ usleep_range(1000, 4000);
+ r = i2c_master_send(client, skb->data, skb->len);
+ }
+
+ if (r >= 0) {
+ if (r != skb->len)
+ r = -EREMOTEIO;
+ else
+ r = 0;
+ }
+
+ st21nfcb_nci_remove_header(skb);
+
+ return r;
+}
+
+/*
+ * Reads an ndlc frame and returns it in a newly allocated sk_buff.
+ * returns:
+ * frame size : if received frame is complete (find ST21NFCB_SOF_EOF at
+ * end of read)
+ * -EAGAIN : if received frame is incomplete (not find ST21NFCB_SOF_EOF
+ * at end of read)
+ * -EREMOTEIO : i2c read error (fatal)
+ * -EBADMSG : frame was incorrect and discarded
+ * (value returned from st21nfcb_nci_i2c_repack)
+ * -EIO : if no ST21NFCB_SOF_EOF is found after reaching
+ * the read length end sequence
+ */
+static int st21nfcb_nci_i2c_read(struct st21nfcb_i2c_phy *phy,
+ struct sk_buff **skb)
+{
+ int r;
+ u8 len;
+ u8 buf[ST21NFCB_NCI_I2C_MAX_SIZE];
+ struct i2c_client *client = phy->i2c_dev;
+
+ r = i2c_master_recv(client, buf, 4);
+ if (r == -EREMOTEIO) { /* Retry, chip was in standby */
+ usleep_range(1000, 4000);
+ r = i2c_master_recv(client, buf, 4);
+ } else if (r != 4) {
+ nfc_err(&client->dev, "cannot read ndlc & nci header\n");
+ return -EREMOTEIO;
+ }
+
+ len = be16_to_cpu(*(__be16 *) (buf + 2));
+ if (len > ST21NFCB_NCI_I2C_MAX_SIZE) {
+ nfc_err(&client->dev, "invalid frame len\n");
+ return -EBADMSG;
+ }
+
+ *skb = alloc_skb(4 + len, GFP_KERNEL);
+ if (*skb == NULL)
+ return -ENOMEM;
+
+ skb_reserve(*skb, 4);
+ skb_put(*skb, 4);
+ memcpy((*skb)->data, buf, 4);
+
+ if (!len)
+ return 0;
+
+ r = i2c_master_recv(client, buf, len);
+ if (r != len) {
+ kfree_skb(*skb);
+ return -EREMOTEIO;
+ }
+
+ skb_put(*skb, len);
+ memcpy((*skb)->data + 4, buf, len);
+
+ I2C_DUMP_SKB("i2c frame read", *skb);
+
+ return 0;
+}
+
+/*
+ * Reads an ndlc frame from the chip.
+ *
+ * On ST21NFCB, IRQ goes in idle state when read starts.
+ */
+static irqreturn_t st21nfcb_nci_irq_thread_fn(int irq, void *phy_id)
+{
+ struct st21nfcb_i2c_phy *phy = phy_id;
+ 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)
+ return IRQ_HANDLED;
+
+ if (!phy->powered) {
+ st21nfcb_nci_i2c_disable(phy);
+ return IRQ_HANDLED;
+ }
+
+ r = st21nfcb_nci_i2c_read(phy, &skb);
+ if (r == -EREMOTEIO) {
+ phy->hard_fault = r;
+ ndlc_recv(phy->ndlc, NULL);
+ return IRQ_HANDLED;
+ } else if (r == -ENOMEM || r == -EBADMSG) {
+ return IRQ_HANDLED;
+ }
+
+ ndlc_recv(phy->ndlc, skb);
+
+ return IRQ_HANDLED;
+}
+
+static struct nfc_phy_ops i2c_phy_ops = {
+ .write = st21nfcb_nci_i2c_write,
+ .enable = st21nfcb_nci_i2c_enable,
+ .disable = st21nfcb_nci_i2c_disable,
+};
+
+#ifdef CONFIG_OF
+static int st21nfcb_nci_i2c_of_request_resources(struct i2c_client *client)
+{
+ struct st21nfcb_i2c_phy *phy = i2c_get_clientdata(client);
+ struct device_node *pp;
+ int gpio;
+ int r;
+
+ pp = client->dev.of_node;
+ if (!pp)
+ return -ENODEV;
+
+ /* Get GPIO from device tree */
+ gpio = of_get_named_gpio(pp, "reset-gpios", 0);
+ if (gpio < 0) {
+ nfc_err(&client->dev,
+ "Failed to retrieve reset-gpios from device tree\n");
+ return gpio;
+ }
+
+ /* GPIO request and configuration */
+ r = devm_gpio_request(&client->dev, gpio, "clf_reset");
+ if (r) {
+ nfc_err(&client->dev, "Failed to request reset pin\n");
+ return -ENODEV;
+ }
+
+ r = gpio_direction_output(gpio, 1);
+ if (r) {
+ nfc_err(&client->dev,
+ "Failed to set reset pin direction as output\n");
+ return -ENODEV;
+ }
+ phy->gpio_reset = gpio;
+
+ /* IRQ */
+ r = irq_of_parse_and_map(pp, 0);
+ if (r < 0) {
+ nfc_err(&client->dev,
+ "Unable to get irq, error: %d\n", r);
+ return r;
+ }
+
+ phy->irq_polarity = irq_get_trigger_type(r);
+ client->irq = r;
+
+ return 0;
+}
+#else
+static int st21nfcb_nci_i2c_of_request_resources(struct i2c_client *client)
+{
+ return -ENODEV;
+}
+#endif
+
+static int st21nfcb_nci_i2c_request_resources(struct i2c_client *client)
+{
+ struct st21nfcb_nfc_platform_data *pdata;
+ struct st21nfcb_i2c_phy *phy = i2c_get_clientdata(client);
+ int r;
+ int irq;
+
+ pdata = client->dev.platform_data;
+ if (pdata == NULL) {
+ nfc_err(&client->dev, "No platform data\n");
+ return -EINVAL;
+ }
+
+ /* store for later use */
+ phy->gpio_irq = pdata->gpio_irq;
+ phy->gpio_reset = pdata->gpio_reset;
+ phy->irq_polarity = pdata->irq_polarity;
+
+ r = devm_gpio_request(&client->dev, phy->gpio_irq, "wake_up");
+ if (r) {
+ pr_err("%s : gpio_request failed\n", __FILE__);
+ return -ENODEV;
+ }
+
+ r = gpio_direction_input(phy->gpio_irq);
+ if (r) {
+ pr_err("%s : gpio_direction_input failed\n", __FILE__);
+ return -ENODEV;
+ }
+
+ r = devm_gpio_request(&client->dev,
+ phy->gpio_reset, "clf_reset");
+ if (r) {
+ pr_err("%s : reset gpio_request failed\n", __FILE__);
+ return -ENODEV;
+ }
+
+ r = gpio_direction_output(phy->gpio_reset, 1);
+ if (r) {
+ pr_err("%s : reset gpio_direction_output failed\n",
+ __FILE__);
+ return -ENODEV;
+ }
+
+ /* IRQ */
+ irq = gpio_to_irq(phy->gpio_irq);
+ if (irq < 0) {
+ nfc_err(&client->dev,
+ "Unable to get irq number for GPIO %d error %d\n",
+ phy->gpio_irq, r);
+ return -ENODEV;
+ }
+ client->irq = irq;
+
+ return 0;
+}
+
+static int st21nfcb_nci_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct st21nfcb_i2c_phy *phy;
+ struct st21nfcb_nfc_platform_data *pdata;
+ int r;
+
+ 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 st21nfcb_i2c_phy),
+ GFP_KERNEL);
+ if (!phy) {
+ nfc_err(&client->dev,
+ "Cannot allocate memory for st21nfcb i2c phy.\n");
+ return -ENOMEM;
+ }
+
+ phy->i2c_dev = client;
+
+ i2c_set_clientdata(client, phy);
+
+ pdata = client->dev.platform_data;
+ if (!pdata && client->dev.of_node) {
+ r = st21nfcb_nci_i2c_of_request_resources(client);
+ if (r) {
+ nfc_err(&client->dev, "No platform data\n");
+ return r;
+ }
+ } else if (pdata) {
+ r = st21nfcb_nci_i2c_request_resources(client);
+ if (r) {
+ nfc_err(&client->dev,
+ "Cannot get platform resources\n");
+ return r;
+ }
+ } else {
+ nfc_err(&client->dev,
+ "st21nfcb platform resources not available\n");
+ return -ENODEV;
+ }
+
+ r = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+ st21nfcb_nci_irq_thread_fn,
+ phy->irq_polarity | IRQF_ONESHOT,
+ ST21NFCB_NCI_DRIVER_NAME, phy);
+ if (r < 0) {
+ nfc_err(&client->dev, "Unable to register IRQ handler\n");
+ return r;
+ }
+
+ return ndlc_probe(phy, &i2c_phy_ops, &client->dev,
+ ST21NFCB_FRAME_HEADROOM, ST21NFCB_FRAME_TAILROOM,
+ &phy->ndlc);
+}
+
+static int st21nfcb_nci_i2c_remove(struct i2c_client *client)
+{
+ struct st21nfcb_i2c_phy *phy = i2c_get_clientdata(client);
+
+ dev_dbg(&client->dev, "%s\n", __func__);
+
+ ndlc_remove(phy->ndlc);
+
+ if (phy->powered)
+ st21nfcb_nci_i2c_disable(phy);
+
+ return 0;
+}
+
+static const struct of_device_id of_st21nfcb_i2c_match[] = {
+ { .compatible = "st,st21nfcb_i2c", },
+ {}
+};
+
+static struct i2c_driver st21nfcb_nci_i2c_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = ST21NFCB_NCI_I2C_DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(of_st21nfcb_i2c_match),
+ },
+ .probe = st21nfcb_nci_i2c_probe,
+ .id_table = st21nfcb_nci_i2c_id_table,
+ .remove = st21nfcb_nci_i2c_remove,
+};
+
+module_i2c_driver(st21nfcb_nci_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/drivers/nfc/st21nfcb/ndlc.c b/drivers/nfc/st21nfcb/ndlc.c
new file mode 100644
index 000000000000..83c97c36112b
--- /dev/null
+++ b/drivers/nfc/st21nfcb/ndlc.c
@@ -0,0 +1,298 @@
+/*
+ * Low Level Transport (NDLC) Driver for STMicroelectronics NFC Chip
+ *
+ * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
+ *
+ * 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 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/sched.h>
+#include <net/nfc/nci_core.h>
+
+#include "ndlc.h"
+#include "st21nfcb.h"
+
+#define NDLC_TIMER_T1 100
+#define NDLC_TIMER_T1_WAIT 400
+#define NDLC_TIMER_T2 1200
+
+#define PCB_TYPE_DATAFRAME 0x80
+#define PCB_TYPE_SUPERVISOR 0xc0
+#define PCB_TYPE_MASK PCB_TYPE_SUPERVISOR
+
+#define PCB_SYNC_ACK 0x20
+#define PCB_SYNC_NACK 0x10
+#define PCB_SYNC_WAIT 0x30
+#define PCB_SYNC_NOINFO 0x00
+#define PCB_SYNC_MASK PCB_SYNC_WAIT
+
+#define PCB_DATAFRAME_RETRANSMIT_YES 0x00
+#define PCB_DATAFRAME_RETRANSMIT_NO 0x04
+#define PCB_DATAFRAME_RETRANSMIT_MASK PCB_DATAFRAME_RETRANSMIT_NO
+
+#define PCB_SUPERVISOR_RETRANSMIT_YES 0x00
+#define PCB_SUPERVISOR_RETRANSMIT_NO 0x02
+#define PCB_SUPERVISOR_RETRANSMIT_MASK PCB_SUPERVISOR_RETRANSMIT_NO
+
+#define PCB_FRAME_CRC_INFO_PRESENT 0x08
+#define PCB_FRAME_CRC_INFO_NOTPRESENT 0x00
+#define PCB_FRAME_CRC_INFO_MASK PCB_FRAME_CRC_INFO_PRESENT
+
+#define NDLC_DUMP_SKB(info, skb) \
+do { \
+ pr_debug("%s:\n", info); \
+ print_hex_dump(KERN_DEBUG, "ndlc: ", DUMP_PREFIX_OFFSET, \
+ 16, 1, skb->data, skb->len, 0); \
+} while (0)
+
+int ndlc_open(struct llt_ndlc *ndlc)
+{
+ /* toggle reset pin */
+ ndlc->ops->enable(ndlc->phy_id);
+ return 0;
+}
+EXPORT_SYMBOL(ndlc_open);
+
+void ndlc_close(struct llt_ndlc *ndlc)
+{
+ /* toggle reset pin */
+ ndlc->ops->disable(ndlc->phy_id);
+}
+EXPORT_SYMBOL(ndlc_close);
+
+int ndlc_send(struct llt_ndlc *ndlc, struct sk_buff *skb)
+{
+ /* add ndlc header */
+ u8 pcb = PCB_TYPE_DATAFRAME | PCB_DATAFRAME_RETRANSMIT_NO |
+ PCB_FRAME_CRC_INFO_NOTPRESENT;
+
+ *skb_push(skb, 1) = pcb;
+ skb_queue_tail(&ndlc->send_q, skb);
+
+ schedule_work(&ndlc->sm_work);
+
+ return 0;
+}
+EXPORT_SYMBOL(ndlc_send);
+
+static void llt_ndlc_send_queue(struct llt_ndlc *ndlc)
+{
+ struct sk_buff *skb;
+ int r;
+ unsigned long time_sent;
+
+ if (ndlc->send_q.qlen)
+ pr_debug("sendQlen=%d unackQlen=%d\n",
+ ndlc->send_q.qlen, ndlc->ack_pending_q.qlen);
+
+ while (ndlc->send_q.qlen) {
+ skb = skb_dequeue(&ndlc->send_q);
+ NDLC_DUMP_SKB("ndlc frame written", skb);
+ r = ndlc->ops->write(ndlc->phy_id, skb);
+ if (r < 0) {
+ ndlc->hard_fault = r;
+ break;
+ }
+ time_sent = jiffies;
+ *(unsigned long *)skb->cb = time_sent;
+
+ skb_queue_tail(&ndlc->ack_pending_q, skb);
+
+ /* start timer t1 for ndlc aknowledge */
+ ndlc->t1_active = true;
+ mod_timer(&ndlc->t1_timer, time_sent +
+ msecs_to_jiffies(NDLC_TIMER_T1));
+ }
+}
+
+static void llt_ndlc_requeue_data_pending(struct llt_ndlc *ndlc)
+{
+ struct sk_buff *skb;
+ u8 pcb;
+
+ while ((skb = skb_dequeue_tail(&ndlc->ack_pending_q))) {
+ pcb = skb->data[0];
+ switch (pcb & PCB_TYPE_MASK) {
+ case PCB_TYPE_SUPERVISOR:
+ skb->data[0] = (pcb & ~PCB_SUPERVISOR_RETRANSMIT_MASK) |
+ PCB_SUPERVISOR_RETRANSMIT_YES;
+ break;
+ case PCB_TYPE_DATAFRAME:
+ skb->data[0] = (pcb & ~PCB_DATAFRAME_RETRANSMIT_MASK) |
+ PCB_DATAFRAME_RETRANSMIT_YES;
+ break;
+ default:
+ pr_err("UNKNOWN Packet Control Byte=%d\n", pcb);
+ kfree_skb(skb);
+ break;
+ }
+ skb_queue_head(&ndlc->send_q, skb);
+ }
+}
+
+static void llt_ndlc_rcv_queue(struct llt_ndlc *ndlc)
+{
+ struct sk_buff *skb;
+ u8 pcb;
+ unsigned long time_sent;
+
+ if (ndlc->rcv_q.qlen)
+ pr_debug("rcvQlen=%d\n", ndlc->rcv_q.qlen);
+
+ while ((skb = skb_dequeue(&ndlc->rcv_q)) != NULL) {
+ pcb = skb->data[0];
+ skb_pull(skb, 1);
+ if ((pcb & PCB_TYPE_MASK) == PCB_TYPE_SUPERVISOR) {
+ switch (pcb & PCB_SYNC_MASK) {
+ case PCB_SYNC_ACK:
+ del_timer_sync(&ndlc->t1_timer);
+ del_timer_sync(&ndlc->t2_timer);
+ ndlc->t2_active = false;
+ ndlc->t1_active = false;
+ break;
+ case PCB_SYNC_NACK:
+ llt_ndlc_requeue_data_pending(ndlc);
+ llt_ndlc_send_queue(ndlc);
+ /* start timer t1 for ndlc aknowledge */
+ time_sent = jiffies;
+ ndlc->t1_active = true;
+ mod_timer(&ndlc->t1_timer, time_sent +
+ msecs_to_jiffies(NDLC_TIMER_T1));
+ break;
+ case PCB_SYNC_WAIT:
+ time_sent = jiffies;
+ ndlc->t1_active = true;
+ mod_timer(&ndlc->t1_timer, time_sent +
+ msecs_to_jiffies(NDLC_TIMER_T1_WAIT));
+ break;
+ default:
+ pr_err("UNKNOWN Packet Control Byte=%d\n", pcb);
+ kfree_skb(skb);
+ break;
+ }
+ } else {
+ nci_recv_frame(ndlc->ndev, skb);
+ }
+ }
+}
+
+static void llt_ndlc_sm_work(struct work_struct *work)
+{
+ struct llt_ndlc *ndlc = container_of(work, struct llt_ndlc, sm_work);
+
+ llt_ndlc_send_queue(ndlc);
+ llt_ndlc_rcv_queue(ndlc);
+
+ if (ndlc->t1_active && timer_pending(&ndlc->t1_timer) == 0) {
+ pr_debug
+ ("Handle T1(recv SUPERVISOR) elapsed (T1 now inactive)\n");
+ ndlc->t1_active = false;
+
+ llt_ndlc_requeue_data_pending(ndlc);
+ llt_ndlc_send_queue(ndlc);
+ }
+
+ if (ndlc->t2_active && timer_pending(&ndlc->t2_timer) == 0) {
+ pr_debug("Handle T2(recv DATA) elapsed (T2 now inactive)\n");
+ ndlc->t2_active = false;
+ ndlc->t1_active = false;
+ del_timer_sync(&ndlc->t1_timer);
+
+ ndlc_close(ndlc);
+ ndlc->hard_fault = -EREMOTEIO;
+ }
+}
+
+void ndlc_recv(struct llt_ndlc *ndlc, struct sk_buff *skb)
+{
+ if (skb == NULL) {
+ pr_err("NULL Frame -> link is dead\n");
+ ndlc->hard_fault = -EREMOTEIO;
+ ndlc_close(ndlc);
+ } else {
+ NDLC_DUMP_SKB("incoming frame", skb);
+ skb_queue_tail(&ndlc->rcv_q, skb);
+ }
+
+ schedule_work(&ndlc->sm_work);
+}
+EXPORT_SYMBOL(ndlc_recv);
+
+static void ndlc_t1_timeout(unsigned long data)
+{
+ struct llt_ndlc *ndlc = (struct llt_ndlc *)data;
+
+ pr_debug("\n");
+
+ schedule_work(&ndlc->sm_work);
+}
+
+static void ndlc_t2_timeout(unsigned long data)
+{
+ struct llt_ndlc *ndlc = (struct llt_ndlc *)data;
+
+ pr_debug("\n");
+
+ schedule_work(&ndlc->sm_work);
+}
+
+int ndlc_probe(void *phy_id, struct nfc_phy_ops *phy_ops, struct device *dev,
+ int phy_headroom, int phy_tailroom, struct llt_ndlc **ndlc_id)
+{
+ struct llt_ndlc *ndlc;
+
+ ndlc = devm_kzalloc(dev, sizeof(struct llt_ndlc), GFP_KERNEL);
+ if (!ndlc) {
+ nfc_err(dev, "Cannot allocate memory for ndlc.\n");
+ return -ENOMEM;
+ }
+ ndlc->ops = phy_ops;
+ ndlc->phy_id = phy_id;
+ ndlc->dev = dev;
+
+ *ndlc_id = ndlc;
+
+ /* start timers */
+ init_timer(&ndlc->t1_timer);
+ ndlc->t1_timer.data = (unsigned long)ndlc;
+ ndlc->t1_timer.function = ndlc_t1_timeout;
+
+ init_timer(&ndlc->t2_timer);
+ ndlc->t2_timer.data = (unsigned long)ndlc;
+ ndlc->t2_timer.function = ndlc_t2_timeout;
+
+ skb_queue_head_init(&ndlc->rcv_q);
+ skb_queue_head_init(&ndlc->send_q);
+ skb_queue_head_init(&ndlc->ack_pending_q);
+
+ INIT_WORK(&ndlc->sm_work, llt_ndlc_sm_work);
+
+ return st21nfcb_nci_probe(ndlc, phy_headroom, phy_tailroom);
+}
+EXPORT_SYMBOL(ndlc_probe);
+
+void ndlc_remove(struct llt_ndlc *ndlc)
+{
+ /* cancel timers */
+ del_timer_sync(&ndlc->t1_timer);
+ del_timer_sync(&ndlc->t2_timer);
+ ndlc->t2_active = false;
+ ndlc->t1_active = false;
+
+ skb_queue_purge(&ndlc->rcv_q);
+ skb_queue_purge(&ndlc->send_q);
+
+ st21nfcb_nci_remove(ndlc->ndev);
+ kfree(ndlc);
+}
+EXPORT_SYMBOL(ndlc_remove);
diff --git a/drivers/nfc/st21nfcb/ndlc.h b/drivers/nfc/st21nfcb/ndlc.h
new file mode 100644
index 000000000000..c30a2f0faa5f
--- /dev/null
+++ b/drivers/nfc/st21nfcb/ndlc.h
@@ -0,0 +1,55 @@
+/*
+ * NCI based Driver for STMicroelectronics NFC Chip
+ *
+ * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
+ *
+ * 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 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/>.
+ */
+
+#ifndef __LOCAL_NDLC_H_
+#define __LOCAL_NDLC_H_
+
+#include <linux/skbuff.h>
+#include <net/nfc/nfc.h>
+
+/* Low Level Transport description */
+struct llt_ndlc {
+ struct nci_dev *ndev;
+ struct nfc_phy_ops *ops;
+ void *phy_id;
+
+ struct timer_list t1_timer;
+ bool t1_active;
+
+ struct timer_list t2_timer;
+ bool t2_active;
+
+ struct sk_buff_head rcv_q;
+ struct sk_buff_head send_q;
+ struct sk_buff_head ack_pending_q;
+
+ struct work_struct sm_work;
+
+ struct device *dev;
+
+ int hard_fault;
+};
+
+int ndlc_open(struct llt_ndlc *ndlc);
+void ndlc_close(struct llt_ndlc *ndlc);
+int ndlc_send(struct llt_ndlc *ndlc, struct sk_buff *skb);
+void ndlc_recv(struct llt_ndlc *ndlc, struct sk_buff *skb);
+int ndlc_probe(void *phy_id, struct nfc_phy_ops *phy_ops, struct device *dev,
+ int phy_headroom, int phy_tailroom, struct llt_ndlc **ndlc_id);
+void ndlc_remove(struct llt_ndlc *ndlc);
+#endif /* __LOCAL_NDLC_H__ */
diff --git a/drivers/nfc/st21nfcb/st21nfcb.c b/drivers/nfc/st21nfcb/st21nfcb.c
new file mode 100644
index 000000000000..4d95863e3063
--- /dev/null
+++ b/drivers/nfc/st21nfcb/st21nfcb.c
@@ -0,0 +1,129 @@
+/*
+ * NCI based Driver for STMicroelectronics NFC Chip
+ *
+ * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
+ *
+ * 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 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/module.h>
+#include <linux/nfc.h>
+#include <net/nfc/nci.h>
+#include <net/nfc/nci_core.h>
+
+#include "st21nfcb.h"
+#include "ndlc.h"
+
+#define DRIVER_DESC "NCI NFC driver for ST21NFCB"
+
+static int st21nfcb_nci_open(struct nci_dev *ndev)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
+ int r;
+
+ if (test_and_set_bit(ST21NFCB_NCI_RUNNING, &info->flags))
+ return 0;
+
+ r = ndlc_open(info->ndlc);
+ if (r)
+ clear_bit(ST21NFCB_NCI_RUNNING, &info->flags);
+
+ return r;
+}
+
+static int st21nfcb_nci_close(struct nci_dev *ndev)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
+
+ if (!test_and_clear_bit(ST21NFCB_NCI_RUNNING, &info->flags))
+ return 0;
+
+ ndlc_close(info->ndlc);
+
+ return 0;
+}
+
+static int st21nfcb_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
+
+ skb->dev = (void *)ndev;
+
+ if (!test_bit(ST21NFCB_NCI_RUNNING, &info->flags))
+ return -EBUSY;
+
+ return ndlc_send(info->ndlc, skb);
+}
+
+static struct nci_ops st21nfcb_nci_ops = {
+ .open = st21nfcb_nci_open,
+ .close = st21nfcb_nci_close,
+ .send = st21nfcb_nci_send,
+};
+
+int st21nfcb_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
+ int phy_tailroom)
+{
+ struct st21nfcb_nci_info *info;
+ int r;
+ u32 protocols;
+
+ info = devm_kzalloc(ndlc->dev,
+ sizeof(struct st21nfcb_nci_info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ protocols = NFC_PROTO_JEWEL_MASK
+ | NFC_PROTO_MIFARE_MASK
+ | NFC_PROTO_FELICA_MASK
+ | NFC_PROTO_ISO14443_MASK
+ | NFC_PROTO_ISO14443_B_MASK
+ | NFC_PROTO_NFC_DEP_MASK;
+
+ ndlc->ndev = nci_allocate_device(&st21nfcb_nci_ops, protocols,
+ phy_headroom, phy_tailroom);
+ if (!ndlc->ndev) {
+ pr_err("Cannot allocate nfc ndev\n");
+ r = -ENOMEM;
+ goto err_alloc_ndev;
+ }
+ info->ndlc = ndlc;
+
+ nci_set_drvdata(ndlc->ndev, info);
+
+ r = nci_register_device(ndlc->ndev);
+ if (r)
+ goto err_regdev;
+
+ return r;
+err_regdev:
+ nci_free_device(ndlc->ndev);
+
+err_alloc_ndev:
+ kfree(info);
+ return r;
+}
+EXPORT_SYMBOL_GPL(st21nfcb_nci_probe);
+
+void st21nfcb_nci_remove(struct nci_dev *ndev)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
+
+ nci_unregister_device(ndev);
+ nci_free_device(ndev);
+ kfree(info);
+}
+EXPORT_SYMBOL_GPL(st21nfcb_nci_remove);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/drivers/nfc/st21nfcb/st21nfcb.h b/drivers/nfc/st21nfcb/st21nfcb.h
new file mode 100644
index 000000000000..4bbbebb9f34d
--- /dev/null
+++ b/drivers/nfc/st21nfcb/st21nfcb.h
@@ -0,0 +1,38 @@
+/*
+ * NCI based Driver for STMicroelectronics NFC Chip
+ *
+ * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
+ *
+ * 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 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/>.
+ */
+
+#ifndef __LOCAL_ST21NFCB_H_
+#define __LOCAL_ST21NFCB_H_
+
+#include <net/nfc/nci_core.h>
+
+#include "ndlc.h"
+
+/* Define private flags: */
+#define ST21NFCB_NCI_RUNNING 1
+
+struct st21nfcb_nci_info {
+ struct llt_ndlc *ndlc;
+ unsigned long flags;
+};
+
+void st21nfcb_nci_remove(struct nci_dev *ndev);
+int st21nfcb_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
+ int phy_tailroom);
+
+#endif /* __LOCAL_ST21NFCB_H_ */
diff --git a/include/linux/platform_data/st21nfcb.h b/include/linux/platform_data/st21nfcb.h
new file mode 100644
index 000000000000..2a7b769c714d
--- /dev/null
+++ b/include/linux/platform_data/st21nfcb.h
@@ -0,0 +1,32 @@
+/*
+ * Driver include for the ST21NFCB NFC chip.
+ *
+ * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
+ *
+ * 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 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/>.
+ */
+
+#ifndef _ST21NFCA_HCI_H_
+#define _ST21NFCA_HCI_H_
+
+#include <linux/i2c.h>
+
+#define ST21NFCB_NCI_DRIVER_NAME "st21nfcb_nci"
+
+struct st21nfcb_nfc_platform_data {
+ unsigned int gpio_irq;
+ unsigned int gpio_reset;
+ unsigned int irq_polarity;
+};
+
+#endif /* _ST21NFCA_HCI_H_ */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-16 10:14:55 +0000