diff options
Diffstat (limited to 'drivers/nfc/st21nfcb')
| -rw-r--r-- | drivers/nfc/st21nfcb/Kconfig | 22 | ||||
| -rw-r--r-- | drivers/nfc/st21nfcb/Makefile | 8 | ||||
| -rw-r--r-- | drivers/nfc/st21nfcb/i2c.c | 462 | ||||
| -rw-r--r-- | drivers/nfc/st21nfcb/ndlc.c | 298 | ||||
| -rw-r--r-- | drivers/nfc/st21nfcb/ndlc.h | 55 | ||||
| -rw-r--r-- | drivers/nfc/st21nfcb/st21nfcb.c | 129 | ||||
| -rw-r--r-- | drivers/nfc/st21nfcb/st21nfcb.h | 38 |
7 files changed, 1012 insertions, 0 deletions
diff --git a/drivers/nfc/st21nfcb/Kconfig b/drivers/nfc/st21nfcb/Kconfig new file mode 100644 index 00000000000..e0322dd03a7 --- /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 00000000000..13d9f03b2fe --- /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 00000000000..8af880ead5d --- /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, ST21NFCB_NCI_I2C_MIN_SIZE); + if (r == -EREMOTEIO) { /* Retry, chip was in standby */ + usleep_range(1000, 4000); + r = i2c_master_recv(client, buf, ST21NFCB_NCI_I2C_MIN_SIZE); + } else if (r != ST21NFCB_NCI_I2C_MIN_SIZE) { + 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(ST21NFCB_NCI_I2C_MIN_SIZE + len, GFP_KERNEL); + if (*skb == NULL) + return -ENOMEM; + + skb_reserve(*skb, ST21NFCB_NCI_I2C_MIN_SIZE); + skb_put(*skb, ST21NFCB_NCI_I2C_MIN_SIZE); + memcpy((*skb)->data, buf, ST21NFCB_NCI_I2C_MIN_SIZE); + + 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 + ST21NFCB_NCI_I2C_MIN_SIZE, 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 00000000000..83c97c36112 --- /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 00000000000..c30a2f0faa5 --- /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 00000000000..4d95863e306 --- /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 00000000000..4bbbebb9f34 --- /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_ */ |