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Fixed MTP to work with TWRP

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awab228 2018-06-19 23:16:04 +02:00
commit f6dfaef42e
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23
drivers/nfc/st21nfca/Kconfig Normal file
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config NFC_ST21NFCA
tristate "STMicroelectronics ST21NFCA NFC driver"
depends on NFC_HCI
select CRC_CCITT
default n
---help---
STMicroelectronics ST21NFCA core driver. It implements the chipset
HCI 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 st21nfca.
Say N if unsure.
config NFC_ST21NFCA_I2C
tristate "NFC ST21NFCA i2c support"
depends on NFC_ST21NFCA && I2C && NFC_SHDLC
---help---
This module adds support for the STMicroelectronics st21nfca i2c interface.
Select this if your platform is using the i2c bus.
If you choose to build a module, it'll be called st21nfca_i2c.
Say N if unsure.

9
drivers/nfc/st21nfca/Makefile Normal file
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#
# Makefile for ST21NFCA HCI based NFC driver
#
st21nfca_hci-objs = st21nfca.o st21nfca_dep.o
obj-$(CONFIG_NFC_ST21NFCA) += st21nfca_hci.o
st21nfca_i2c-objs = i2c.o
obj-$(CONFIG_NFC_ST21NFCA_I2C) += st21nfca_i2c.o

709
drivers/nfc/st21nfca/i2c.c Normal file
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/*
* I2C Link Layer for ST21NFCA HCI 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/st21nfca.h>
#include <net/nfc/hci.h>
#include <net/nfc/llc.h>
#include <net/nfc/nfc.h>
#include "st21nfca.h"
/*
* Every frame starts with ST21NFCA_SOF_EOF and ends with ST21NFCA_SOF_EOF.
* Because ST21NFCA_SOF_EOF is a possible data value, there is a mecanism
* called byte stuffing has been introduced.
*
* if byte == ST21NFCA_SOF_EOF or ST21NFCA_ESCAPE_BYTE_STUFFING
* - insert ST21NFCA_ESCAPE_BYTE_STUFFING (escape byte)
* - xor byte with ST21NFCA_BYTE_STUFFING_MASK
*/
#define ST21NFCA_SOF_EOF 0x7e
#define ST21NFCA_BYTE_STUFFING_MASK 0x20
#define ST21NFCA_ESCAPE_BYTE_STUFFING 0x7d
/* SOF + 00 */
#define ST21NFCA_FRAME_HEADROOM 2
/* 2 bytes crc + EOF */
#define ST21NFCA_FRAME_TAILROOM 3
#define IS_START_OF_FRAME(buf) (buf[0] == ST21NFCA_SOF_EOF && \
buf[1] == 0)
#define ST21NFCA_HCI_I2C_DRIVER_NAME "st21nfca_hci_i2c"
static struct i2c_device_id st21nfca_hci_i2c_id_table[] = {
{ST21NFCA_HCI_DRIVER_NAME, 0},
{}
};
MODULE_DEVICE_TABLE(i2c, st21nfca_hci_i2c_id_table);
struct st21nfca_i2c_phy {
struct i2c_client *i2c_dev;
struct nfc_hci_dev *hdev;
unsigned int gpio_ena;
unsigned int gpio_irq;
unsigned int irq_polarity;
struct sk_buff *pending_skb;
int current_read_len;
/*
* crc might have fail because i2c macro
* is disable due to other interface activity
*/
int crc_trials;
int powered;
int run_mode;
/*
* < 0 if hardware error occured (e.g. i2c err)
* and prevents normal operation.
*/
int hard_fault;
struct mutex phy_lock;
};
static u8 len_seq[] = { 16, 24, 12, 29 };
static u16 wait_tab[] = { 2, 3, 5, 15, 20, 40};
#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)
/*
* In order to get the CLF in a known state we generate an internal reboot
* using a proprietary command.
* Once the reboot is completed, we expect to receive a ST21NFCA_SOF_EOF
* fill buffer.
*/
static int st21nfca_hci_platform_init(struct st21nfca_i2c_phy *phy)
{
u16 wait_reboot[] = { 50, 300, 1000 };
char reboot_cmd[] = { 0x7E, 0x66, 0x48, 0xF6, 0x7E };
u8 tmp[ST21NFCA_HCI_LLC_MAX_SIZE];
int i, r = -1;
for (i = 0; i < ARRAY_SIZE(wait_reboot) && r < 0; i++) {
r = i2c_master_send(phy->i2c_dev, reboot_cmd,
sizeof(reboot_cmd));
if (r < 0)
msleep(wait_reboot[i]);
}
if (r < 0)
return r;
/* CLF is spending about 20ms to do an internal reboot */
msleep(20);
r = -1;
for (i = 0; i < ARRAY_SIZE(wait_reboot) && r < 0; i++) {
r = i2c_master_recv(phy->i2c_dev, tmp,
ST21NFCA_HCI_LLC_MAX_SIZE);
if (r < 0)
msleep(wait_reboot[i]);
}
if (r < 0)
return r;
for (i = 0; i < ST21NFCA_HCI_LLC_MAX_SIZE &&
tmp[i] == ST21NFCA_SOF_EOF; i++)
;
if (r != ST21NFCA_HCI_LLC_MAX_SIZE)
return -ENODEV;
usleep_range(1000, 1500);
return 0;
}
static int st21nfca_hci_i2c_enable(void *phy_id)
{
struct st21nfca_i2c_phy *phy = phy_id;
gpio_set_value(phy->gpio_ena, 1);
phy->powered = 1;
phy->run_mode = ST21NFCA_HCI_MODE;
usleep_range(10000, 15000);
return 0;
}
static void st21nfca_hci_i2c_disable(void *phy_id)
{
struct st21nfca_i2c_phy *phy = phy_id;
pr_info("\n");
gpio_set_value(phy->gpio_ena, 0);
phy->powered = 0;
}
static void st21nfca_hci_add_len_crc(struct sk_buff *skb)
{
u16 crc;
u8 tmp;
*skb_push(skb, 1) = 0;
crc = crc_ccitt(0xffff, skb->data, skb->len);
crc = ~crc;
tmp = crc & 0x00ff;
*skb_put(skb, 1) = tmp;
tmp = (crc >> 8) & 0x00ff;
*skb_put(skb, 1) = tmp;
}
static void st21nfca_hci_remove_len_crc(struct sk_buff *skb)
{
skb_pull(skb, ST21NFCA_FRAME_HEADROOM);
skb_trim(skb, skb->len - ST21NFCA_FRAME_TAILROOM);
}
/*
* 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 st21nfca_hci_i2c_write(void *phy_id, struct sk_buff *skb)
{
int r = -1, i, j;
struct st21nfca_i2c_phy *phy = phy_id;
struct i2c_client *client = phy->i2c_dev;
u8 tmp[ST21NFCA_HCI_LLC_MAX_SIZE * 2];
I2C_DUMP_SKB("st21nfca_hci_i2c_write", skb);
if (phy->hard_fault != 0)
return phy->hard_fault;
/*
* Compute CRC before byte stuffing computation on frame
* Note st21nfca_hci_add_len_crc is doing a byte stuffing
* on its own value
*/
st21nfca_hci_add_len_crc(skb);
/* add ST21NFCA_SOF_EOF on tail */
*skb_put(skb, 1) = ST21NFCA_SOF_EOF;
/* add ST21NFCA_SOF_EOF on head */
*skb_push(skb, 1) = ST21NFCA_SOF_EOF;
/*
* Compute byte stuffing
* if byte == ST21NFCA_SOF_EOF or ST21NFCA_ESCAPE_BYTE_STUFFING
* insert ST21NFCA_ESCAPE_BYTE_STUFFING (escape byte)
* xor byte with ST21NFCA_BYTE_STUFFING_MASK
*/
tmp[0] = skb->data[0];
for (i = 1, j = 1; i < skb->len - 1; i++, j++) {
if (skb->data[i] == ST21NFCA_SOF_EOF
|| skb->data[i] == ST21NFCA_ESCAPE_BYTE_STUFFING) {
tmp[j] = ST21NFCA_ESCAPE_BYTE_STUFFING;
j++;
tmp[j] = skb->data[i] ^ ST21NFCA_BYTE_STUFFING_MASK;
} else {
tmp[j] = skb->data[i];
}
}
tmp[j] = skb->data[i];
j++;
/*
* Manage sleep mode
* Try 3 times to send data with delay between each
*/
mutex_lock(&phy->phy_lock);
for (i = 0; i < ARRAY_SIZE(wait_tab) && r < 0; i++) {
r = i2c_master_send(client, tmp, j);
if (r < 0)
msleep(wait_tab[i]);
}
mutex_unlock(&phy->phy_lock);
if (r >= 0) {
if (r != j)
r = -EREMOTEIO;
else
r = 0;
}
st21nfca_hci_remove_len_crc(skb);
return r;
}
static int get_frame_size(u8 *buf, int buflen)
{
int len = 0;
if (buf[len + 1] == ST21NFCA_SOF_EOF)
return 0;
for (len = 1; len < buflen && buf[len] != ST21NFCA_SOF_EOF; len++)
;
return len;
}
static int check_crc(u8 *buf, int buflen)
{
u16 crc;
crc = crc_ccitt(0xffff, buf, buflen - 2);
crc = ~crc;
if (buf[buflen - 2] != (crc & 0xff) || buf[buflen - 1] != (crc >> 8)) {
pr_err(ST21NFCA_HCI_DRIVER_NAME
": CRC error 0x%x != 0x%x 0x%x\n", crc, buf[buflen - 1],
buf[buflen - 2]);
pr_info(DRIVER_DESC ": %s : BAD CRC\n", __func__);
print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
16, 2, buf, buflen, false);
return -EPERM;
}
return 0;
}
/*
* Prepare received data for upper layer.
* Received data include byte stuffing, crc and sof/eof
* which is not usable by hci part.
* returns:
* frame size without sof/eof, header and byte stuffing
* -EBADMSG : frame was incorrect and discarded
*/
static int st21nfca_hci_i2c_repack(struct sk_buff *skb)
{
int i, j, r, size;
if (skb->len < 1 || (skb->len > 1 && skb->data[1] != 0))
return -EBADMSG;
size = get_frame_size(skb->data, skb->len);
if (size > 0) {
skb_trim(skb, size);
/* remove ST21NFCA byte stuffing for upper layer */
for (i = 1, j = 0; i < skb->len; i++) {
if (skb->data[i + j] ==
(u8) ST21NFCA_ESCAPE_BYTE_STUFFING) {
skb->data[i] = skb->data[i + j + 1]
| ST21NFCA_BYTE_STUFFING_MASK;
i++;
j++;
}
skb->data[i] = skb->data[i + j];
}
/* remove byte stuffing useless byte */
skb_trim(skb, i - j);
/* remove ST21NFCA_SOF_EOF from head */
skb_pull(skb, 1);
r = check_crc(skb->data, skb->len);
if (r != 0) {
i = 0;
return -EBADMSG;
}
/* remove headbyte */
skb_pull(skb, 1);
/* remove crc. Byte Stuffing is already removed here */
skb_trim(skb, skb->len - 2);
return skb->len;
}
return 0;
}
/*
* Reads an shdlc frame and returns it in a newly allocated sk_buff. Guarantees
* that i2c bus will be flushed and that next read will start on a new frame.
* returned skb contains only LLC header and payload.
* returns:
* frame size : if received frame is complete (find ST21NFCA_SOF_EOF at
* end of read)
* -EAGAIN : if received frame is incomplete (not find ST21NFCA_SOF_EOF
* at end of read)
* -EREMOTEIO : i2c read error (fatal)
* -EBADMSG : frame was incorrect and discarded
* (value returned from st21nfca_hci_i2c_repack)
* -EIO : if no ST21NFCA_SOF_EOF is found after reaching
* the read length end sequence
*/
static int st21nfca_hci_i2c_read(struct st21nfca_i2c_phy *phy,
struct sk_buff *skb)
{
int r, i;
u8 len;
u8 buf[ST21NFCA_HCI_LLC_MAX_PAYLOAD];
struct i2c_client *client = phy->i2c_dev;
if (phy->current_read_len < ARRAY_SIZE(len_seq)) {
len = len_seq[phy->current_read_len];
/*
* Add retry mecanism
* Operation on I2C interface may fail in case of operation on
* RF or SWP interface
*/
r = 0;
mutex_lock(&phy->phy_lock);
for (i = 0; i < ARRAY_SIZE(wait_tab) && r <= 0; i++) {
r = i2c_master_recv(client, buf, len);
if (r < 0)
msleep(wait_tab[i]);
}
mutex_unlock(&phy->phy_lock);
if (r != len) {
phy->current_read_len = 0;
return -EREMOTEIO;
}
/*
* The first read sequence does not start with SOF.
* Data is corrupeted so we drop it.
*/
if (!phy->current_read_len && !IS_START_OF_FRAME(buf)) {
skb_trim(skb, 0);
phy->current_read_len = 0;
return -EIO;
} else if (phy->current_read_len && IS_START_OF_FRAME(buf)) {
/*
* Previous frame transmission was interrupted and
* the frame got repeated.
* Received frame start with ST21NFCA_SOF_EOF + 00.
*/
skb_trim(skb, 0);
phy->current_read_len = 0;
}
memcpy(skb_put(skb, len), buf, len);
if (skb->data[skb->len - 1] == ST21NFCA_SOF_EOF) {
phy->current_read_len = 0;
return st21nfca_hci_i2c_repack(skb);
}
phy->current_read_len++;
return -EAGAIN;
}
return -EIO;
}
/*
* Reads an shdlc frame from the chip. This is not as straightforward as it
* seems. The frame format is data-crc, and corruption can occur anywhere
* while transiting on i2c bus, such that we could read an invalid data.
* The tricky case is when we read a corrupted data or crc. We must detect
* this here in order to determine that data can be transmitted to the hci
* core. This is the reason why we check the crc here.
* The CLF will repeat a frame until we send a RR on that frame.
*
* On ST21NFCA, IRQ goes in idle when read starts. As no size information are
* available in the incoming data, other IRQ might come. Every IRQ will trigger
* a read sequence with different length and will fill the current frame.
* The reception is complete once we reach a ST21NFCA_SOF_EOF.
*/
static irqreturn_t st21nfca_hci_irq_thread_fn(int irq, void *phy_id)
{
struct st21nfca_i2c_phy *phy = phy_id;
struct i2c_client *client;
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 = st21nfca_hci_i2c_read(phy, phy->pending_skb);
if (r == -EREMOTEIO) {
phy->hard_fault = r;
nfc_hci_recv_frame(phy->hdev, NULL);
return IRQ_HANDLED;
} else if (r == -EAGAIN || r == -EIO) {
return IRQ_HANDLED;
} else if (r == -EBADMSG && phy->crc_trials < ARRAY_SIZE(wait_tab)) {
/*
* With ST21NFCA, only one interface (I2C, RF or SWP)
* may be active at a time.
* Having incorrect crc is usually due to i2c macrocell
* deactivation in the middle of a transmission.
* It may generate corrupted data on i2c.
* We give sometime to get i2c back.
* The complete frame will be repeated.
*/
msleep(wait_tab[phy->crc_trials]);
phy->crc_trials++;
phy->current_read_len = 0;
kfree_skb(phy->pending_skb);
} else if (r > 0) {
/*
* We succeeded to read data from the CLF and
* data is valid.
* Reset counter.
*/
nfc_hci_recv_frame(phy->hdev, phy->pending_skb);
phy->crc_trials = 0;
} else {
kfree_skb(phy->pending_skb);
}
phy->pending_skb = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE * 2, GFP_KERNEL);
if (phy->pending_skb == NULL) {
phy->hard_fault = -ENOMEM;
nfc_hci_recv_frame(phy->hdev, NULL);
}
return IRQ_HANDLED;
}
static struct nfc_phy_ops i2c_phy_ops = {
.write = st21nfca_hci_i2c_write,
.enable = st21nfca_hci_i2c_enable,
.disable = st21nfca_hci_i2c_disable,
};
#ifdef CONFIG_OF
static int st21nfca_hci_i2c_of_request_resources(struct i2c_client *client)
{
struct st21nfca_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, "enable-gpios", 0);
if (gpio < 0) {
nfc_err(&client->dev, "Failed to retrieve enable-gpios from device tree\n");
return gpio;
}
/* GPIO request and configuration */
r = devm_gpio_request_one(&client->dev, gpio, GPIOF_OUT_INIT_HIGH,
"clf_enable");
if (r) {
nfc_err(&client->dev, "Failed to request enable pin\n");
return -ENODEV;
}
phy->gpio_ena = 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 st21nfca_hci_i2c_of_request_resources(struct i2c_client *client)
{
return -ENODEV;
}
#endif
static int st21nfca_hci_i2c_request_resources(struct i2c_client *client)
{
struct st21nfca_nfc_platform_data *pdata;
struct st21nfca_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_ena = pdata->gpio_ena;
phy->irq_polarity = pdata->irq_polarity;
r = devm_gpio_request_one(&client->dev, phy->gpio_irq, GPIOF_IN,
"wake_up");
if (r) {
pr_err("%s : gpio_request failed\n", __FILE__);
return -ENODEV;
}
if (phy->gpio_ena > 0) {
r = devm_gpio_request_one(&client->dev, phy->gpio_ena,
GPIOF_OUT_INIT_HIGH, "clf_enable");
if (r) {
pr_err("%s : ena gpio_request 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 st21nfca_hci_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct st21nfca_i2c_phy *phy;
struct st21nfca_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 st21nfca_i2c_phy),
GFP_KERNEL);
if (!phy) {
nfc_err(&client->dev,
"Cannot allocate memory for st21nfca i2c phy.\n");
return -ENOMEM;
}
phy->i2c_dev = client;
phy->pending_skb = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE * 2, GFP_KERNEL);
if (phy->pending_skb == NULL)
return -ENOMEM;
phy->current_read_len = 0;
phy->crc_trials = 0;
mutex_init(&phy->phy_lock);
i2c_set_clientdata(client, phy);
pdata = client->dev.platform_data;
if (!pdata && client->dev.of_node) {
r = st21nfca_hci_i2c_of_request_resources(client);
if (r) {
nfc_err(&client->dev, "No platform data\n");
return r;
}
} else if (pdata) {
r = st21nfca_hci_i2c_request_resources(client);
if (r) {
nfc_err(&client->dev, "Cannot get platform resources\n");
return r;
}
} else {
nfc_err(&client->dev, "st21nfca platform resources not available\n");
return -ENODEV;
}
r = st21nfca_hci_platform_init(phy);
if (r < 0) {
nfc_err(&client->dev, "Unable to reboot st21nfca\n");
return -ENODEV;
}
r = devm_request_threaded_irq(&client->dev, client->irq, NULL,
st21nfca_hci_irq_thread_fn,
phy->irq_polarity | IRQF_ONESHOT,
ST21NFCA_HCI_DRIVER_NAME, phy);
if (r < 0) {
nfc_err(&client->dev, "Unable to register IRQ handler\n");
return r;
}
return st21nfca_hci_probe(phy, &i2c_phy_ops, LLC_SHDLC_NAME,
ST21NFCA_FRAME_HEADROOM, ST21NFCA_FRAME_TAILROOM,
ST21NFCA_HCI_LLC_MAX_PAYLOAD, &phy->hdev);
}
static int st21nfca_hci_i2c_remove(struct i2c_client *client)
{
struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client);
dev_dbg(&client->dev, "%s\n", __func__);
st21nfca_hci_remove(phy->hdev);
if (phy->powered)
st21nfca_hci_i2c_disable(phy);
return 0;
}
static const struct of_device_id of_st21nfca_i2c_match[] = {
{ .compatible = "st,st21nfca_i2c", },
{}
};
static struct i2c_driver st21nfca_hci_i2c_driver = {
.driver = {
.owner = THIS_MODULE,
.name = ST21NFCA_HCI_I2C_DRIVER_NAME,
.of_match_table = of_match_ptr(of_st21nfca_i2c_match),
},
.probe = st21nfca_hci_i2c_probe,
.id_table = st21nfca_hci_i2c_id_table,
.remove = st21nfca_hci_i2c_remove,
};
module_i2c_driver(st21nfca_hci_i2c_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(DRIVER_DESC);

989
drivers/nfc/st21nfca/st21nfca.c Normal file
View file

@ -0,0 +1,989 @@
/*
* HCI 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/hci.h>
#include <net/nfc/llc.h>
#include "st21nfca.h"
#include "st21nfca_dep.h"
#define DRIVER_DESC "HCI NFC driver for ST21NFCA"
#define FULL_VERSION_LEN 3
/* Proprietary gates, events, commands and registers */
/* Commands that apply to all RF readers */
#define ST21NFCA_RF_READER_CMD_PRESENCE_CHECK 0x30
#define ST21NFCA_RF_READER_ISO15693_GATE 0x12
#define ST21NFCA_RF_READER_ISO15693_INVENTORY 0x01
/*
* Reader gate for communication with contact-less cards using Type A
* protocol ISO14443-3 but not compliant with ISO14443-4
*/
#define ST21NFCA_RF_READER_14443_3_A_GATE 0x15
#define ST21NFCA_RF_READER_14443_3_A_UID 0x02
#define ST21NFCA_RF_READER_14443_3_A_ATQA 0x03
#define ST21NFCA_RF_READER_14443_3_A_SAK 0x04
#define ST21NFCA_RF_READER_F_DATARATE 0x01
#define ST21NFCA_RF_READER_F_DATARATE_106 0x01
#define ST21NFCA_RF_READER_F_DATARATE_212 0x02
#define ST21NFCA_RF_READER_F_DATARATE_424 0x04
#define ST21NFCA_RF_READER_F_POL_REQ 0x02
#define ST21NFCA_RF_READER_F_POL_REQ_DEFAULT 0xffff0000
#define ST21NFCA_RF_READER_F_NFCID2 0x03
#define ST21NFCA_RF_READER_F_NFCID1 0x04
#define ST21NFCA_RF_CARD_F_MODE 0x01
#define ST21NFCA_RF_CARD_F_NFCID2_LIST 0x04
#define ST21NFCA_RF_CARD_F_NFCID1 0x05
#define ST21NFCA_RF_CARD_F_SENS_RES 0x06
#define ST21NFCA_RF_CARD_F_SEL_RES 0x07
#define ST21NFCA_RF_CARD_F_DATARATE 0x08
#define ST21NFCA_RF_CARD_F_DATARATE_212_424 0x01
#define ST21NFCA_DEVICE_MGNT_GATE 0x01
#define ST21NFCA_DEVICE_MGNT_PIPE 0x02
#define ST21NFCA_DM_GETINFO 0x13
#define ST21NFCA_DM_GETINFO_PIPE_LIST 0x02
#define ST21NFCA_DM_GETINFO_PIPE_INFO 0x01
#define ST21NFCA_DM_PIPE_CREATED 0x02
#define ST21NFCA_DM_PIPE_OPEN 0x04
#define ST21NFCA_DM_RF_ACTIVE 0x80
#define ST21NFCA_DM_DISCONNECT 0x30
#define ST21NFCA_DM_IS_PIPE_OPEN(p) \
((p & 0x0f) == (ST21NFCA_DM_PIPE_CREATED | ST21NFCA_DM_PIPE_OPEN))
#define ST21NFCA_NFC_MODE 0x03 /* NFC_MODE parameter*/
#define ST21NFCA_EVT_FIELD_ON 0x11
#define ST21NFCA_EVT_CARD_DEACTIVATED 0x12
#define ST21NFCA_EVT_CARD_ACTIVATED 0x13
#define ST21NFCA_EVT_FIELD_OFF 0x14
static DECLARE_BITMAP(dev_mask, ST21NFCA_NUM_DEVICES);
static struct nfc_hci_gate st21nfca_gates[] = {
{NFC_HCI_ADMIN_GATE, NFC_HCI_ADMIN_PIPE},
{NFC_HCI_LOOPBACK_GATE, NFC_HCI_INVALID_PIPE},
{NFC_HCI_ID_MGMT_GATE, NFC_HCI_INVALID_PIPE},
{NFC_HCI_LINK_MGMT_GATE, NFC_HCI_LINK_MGMT_PIPE},
{NFC_HCI_RF_READER_B_GATE, NFC_HCI_INVALID_PIPE},
{NFC_HCI_RF_READER_A_GATE, NFC_HCI_INVALID_PIPE},
{ST21NFCA_DEVICE_MGNT_GATE, ST21NFCA_DEVICE_MGNT_PIPE},
{ST21NFCA_RF_READER_F_GATE, NFC_HCI_INVALID_PIPE},
{ST21NFCA_RF_READER_14443_3_A_GATE, NFC_HCI_INVALID_PIPE},
{ST21NFCA_RF_READER_ISO15693_GATE, NFC_HCI_INVALID_PIPE},
{ST21NFCA_RF_CARD_F_GATE, NFC_HCI_INVALID_PIPE},
};
struct st21nfca_pipe_info {
u8 pipe_state;
u8 src_host_id;
u8 src_gate_id;
u8 dst_host_id;
u8 dst_gate_id;
} __packed;
/* Largest headroom needed for outgoing custom commands */
#define ST21NFCA_CMDS_HEADROOM 7
static int st21nfca_hci_load_session(struct nfc_hci_dev *hdev)
{
int i, j, r;
struct sk_buff *skb_pipe_list, *skb_pipe_info;
struct st21nfca_pipe_info *info;
u8 pipe_list[] = { ST21NFCA_DM_GETINFO_PIPE_LIST,
NFC_HCI_TERMINAL_HOST_ID
};
u8 pipe_info[] = { ST21NFCA_DM_GETINFO_PIPE_INFO,
NFC_HCI_TERMINAL_HOST_ID, 0
};
skb_pipe_list = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE, GFP_KERNEL);
if (!skb_pipe_list) {
r = -ENOMEM;
goto free_list;
}
skb_pipe_info = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE, GFP_KERNEL);
if (!skb_pipe_info) {
r = -ENOMEM;
goto free_info;
}
/* On ST21NFCA device pipes number are dynamics
* A maximum of 16 pipes can be created at the same time
* If pipes are already created, hci_dev_up will fail.
* Doing a clear all pipe is a bad idea because:
* - It does useless EEPROM cycling
* - It might cause issue for secure elements support
* (such as removing connectivity or APDU reader pipe)
* A better approach on ST21NFCA is to:
* - get a pipe list for each host.
* (eg: NFC_HCI_HOST_CONTROLLER_ID for now).
* (TODO Later on UICC HOST and eSE HOST)
* - get pipe information
* - match retrieved pipe list in st21nfca_gates
* ST21NFCA_DEVICE_MGNT_GATE is a proprietary gate
* with ST21NFCA_DEVICE_MGNT_PIPE.
* Pipe can be closed and need to be open.
*/
r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
ST21NFCA_DEVICE_MGNT_GATE, ST21NFCA_DEVICE_MGNT_PIPE);
if (r < 0)
goto free_info;
/* Get pipe list */
r = nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
ST21NFCA_DM_GETINFO, pipe_list, sizeof(pipe_list),
&skb_pipe_list);
if (r < 0)
goto free_info;
/* Complete the existing gate_pipe table */
for (i = 0; i < skb_pipe_list->len; i++) {
pipe_info[2] = skb_pipe_list->data[i];
r = nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
ST21NFCA_DM_GETINFO, pipe_info,
sizeof(pipe_info), &skb_pipe_info);
if (r)
continue;
/*
* Match pipe ID and gate ID
* Output format from ST21NFC_DM_GETINFO is:
* - pipe state (1byte)
* - source hid (1byte)
* - source gid (1byte)
* - destination hid (1byte)
* - destination gid (1byte)
*/
info = (struct st21nfca_pipe_info *) skb_pipe_info->data;
for (j = 0; (j < ARRAY_SIZE(st21nfca_gates)) &&
(st21nfca_gates[j].gate != info->dst_gate_id);
j++)
;
if (j < ARRAY_SIZE(st21nfca_gates) &&
st21nfca_gates[j].gate == info->dst_gate_id &&
ST21NFCA_DM_IS_PIPE_OPEN(info->pipe_state)) {
st21nfca_gates[j].pipe = pipe_info[2];
hdev->gate2pipe[st21nfca_gates[j].gate] =
st21nfca_gates[j].pipe;
}
}
/*
* 3 gates have a well known pipe ID.
* They will never appear in the pipe list
*/
if (skb_pipe_list->len + 3 < ARRAY_SIZE(st21nfca_gates)) {
for (i = skb_pipe_list->len + 3;
i < ARRAY_SIZE(st21nfca_gates); i++) {
r = nfc_hci_connect_gate(hdev,
NFC_HCI_HOST_CONTROLLER_ID,
st21nfca_gates[i].gate,
st21nfca_gates[i].pipe);
if (r < 0)
goto free_info;
}
}
memcpy(hdev->init_data.gates, st21nfca_gates, sizeof(st21nfca_gates));
free_info:
kfree_skb(skb_pipe_info);
free_list:
kfree_skb(skb_pipe_list);
return r;
}
static int st21nfca_hci_open(struct nfc_hci_dev *hdev)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
int r;
mutex_lock(&info->info_lock);
if (info->state != ST21NFCA_ST_COLD) {
r = -EBUSY;
goto out;
}
r = info->phy_ops->enable(info->phy_id);
if (r == 0)
info->state = ST21NFCA_ST_READY;
out:
mutex_unlock(&info->info_lock);
return r;
}
static void st21nfca_hci_close(struct nfc_hci_dev *hdev)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
mutex_lock(&info->info_lock);
if (info->state == ST21NFCA_ST_COLD)
goto out;
info->phy_ops->disable(info->phy_id);
info->state = ST21NFCA_ST_COLD;
out:
mutex_unlock(&info->info_lock);
}
static int st21nfca_hci_ready(struct nfc_hci_dev *hdev)
{
struct sk_buff *skb;
u8 param;
int r;
param = NFC_HCI_UICC_HOST_ID;
r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
NFC_HCI_ADMIN_WHITELIST, &param, 1);
if (r < 0)
return r;
/* Set NFC_MODE in device management gate to enable */
r = nfc_hci_get_param(hdev, ST21NFCA_DEVICE_MGNT_GATE,
ST21NFCA_NFC_MODE, &skb);
if (r < 0)
return r;
if (skb->data[0] == 0) {
kfree_skb(skb);
param = 1;
r = nfc_hci_set_param(hdev, ST21NFCA_DEVICE_MGNT_GATE,
ST21NFCA_NFC_MODE, &param, 1);
if (r < 0)
return r;
}
r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
NFC_HCI_EVT_END_OPERATION, NULL, 0);
if (r < 0)
return r;
r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
NFC_HCI_ID_MGMT_VERSION_SW, &skb);
if (r < 0)
return r;
if (skb->len != FULL_VERSION_LEN) {
kfree_skb(skb);
return -EINVAL;
}
print_hex_dump(KERN_DEBUG, "FULL VERSION SOFTWARE INFO: ",
DUMP_PREFIX_NONE, 16, 1,
skb->data, FULL_VERSION_LEN, false);
kfree_skb(skb);
return 0;
}
static int st21nfca_hci_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
return info->phy_ops->write(info->phy_id, skb);
}
static int st21nfca_hci_start_poll(struct nfc_hci_dev *hdev,
u32 im_protocols, u32 tm_protocols)
{
int r;
u32 pol_req;
u8 param[19];
struct sk_buff *datarate_skb;
pr_info(DRIVER_DESC ": %s protocols 0x%x 0x%x\n",
__func__, im_protocols, tm_protocols);
r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
NFC_HCI_EVT_END_OPERATION, NULL, 0);
if (r < 0)
return r;
if (im_protocols) {
/*
* enable polling according to im_protocols & tm_protocols
* - CLOSE pipe according to im_protocols & tm_protocols
*/
if ((NFC_HCI_RF_READER_B_GATE & im_protocols) == 0) {
r = nfc_hci_disconnect_gate(hdev,
NFC_HCI_RF_READER_B_GATE);
if (r < 0)
return r;
}
if ((NFC_HCI_RF_READER_A_GATE & im_protocols) == 0) {
r = nfc_hci_disconnect_gate(hdev,
NFC_HCI_RF_READER_A_GATE);
if (r < 0)
return r;
}
if ((ST21NFCA_RF_READER_F_GATE & im_protocols) == 0) {
r = nfc_hci_disconnect_gate(hdev,
ST21NFCA_RF_READER_F_GATE);
if (r < 0)
return r;
} else {
hdev->gb = nfc_get_local_general_bytes(hdev->ndev,
&hdev->gb_len);
if (hdev->gb == NULL || hdev->gb_len == 0) {
im_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
tm_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
}
param[0] = ST21NFCA_RF_READER_F_DATARATE_106 |
ST21NFCA_RF_READER_F_DATARATE_212 |
ST21NFCA_RF_READER_F_DATARATE_424;
r = nfc_hci_set_param(hdev, ST21NFCA_RF_READER_F_GATE,
ST21NFCA_RF_READER_F_DATARATE,
param, 1);
if (r < 0)
return r;
pol_req = be32_to_cpu((__force __be32)
ST21NFCA_RF_READER_F_POL_REQ_DEFAULT);
r = nfc_hci_set_param(hdev, ST21NFCA_RF_READER_F_GATE,
ST21NFCA_RF_READER_F_POL_REQ,
(u8 *) &pol_req, 4);
if (r < 0)
return r;
}
if ((ST21NFCA_RF_READER_14443_3_A_GATE & im_protocols) == 0) {
r = nfc_hci_disconnect_gate(hdev,
ST21NFCA_RF_READER_14443_3_A_GATE);
if (r < 0)
return r;
}
if ((ST21NFCA_RF_READER_ISO15693_GATE & im_protocols) == 0) {
r = nfc_hci_disconnect_gate(hdev,
ST21NFCA_RF_READER_ISO15693_GATE);
if (r < 0)
return r;
}
r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
if (r < 0)
nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
NFC_HCI_EVT_END_OPERATION, NULL, 0);
}
if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
r = nfc_hci_get_param(hdev, ST21NFCA_RF_CARD_F_GATE,
ST21NFCA_RF_CARD_F_DATARATE,
&datarate_skb);
if (r < 0)
return r;
/* Configure the maximum supported datarate to 424Kbps */
if (datarate_skb->len > 0 &&
datarate_skb->data[0] !=
ST21NFCA_RF_CARD_F_DATARATE_212_424) {
param[0] = ST21NFCA_RF_CARD_F_DATARATE_212_424;
r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
ST21NFCA_RF_CARD_F_DATARATE,
param, 1);
if (r < 0)
return r;
}
/*
* Configure sens_res
*
* NFC Forum Digital Spec Table 7:
* NFCID1 size: triple (10 bytes)
*/
param[0] = 0x00;
param[1] = 0x08;
r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
ST21NFCA_RF_CARD_F_SENS_RES, param, 2);
if (r < 0)
return r;
/*
* Configure sel_res
*
* NFC Forum Digistal Spec Table 17:
* b3 set to 0b (value b7-b6):
* - 10b: Configured for NFC-DEP Protocol
*/
param[0] = 0x40;
r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
ST21NFCA_RF_CARD_F_SEL_RES, param, 1);
if (r < 0)
return r;
/* Configure NFCID1 Random uid */
r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
ST21NFCA_RF_CARD_F_NFCID1, NULL, 0);
if (r < 0)
return r;
/* Configure NFCID2_LIST */
/* System Code */
param[0] = 0x00;
param[1] = 0x00;
/* NFCID2 */
param[2] = 0x01;
param[3] = 0xfe;
param[4] = 'S';
param[5] = 'T';
param[6] = 'M';
param[7] = 'i';
param[8] = 'c';
param[9] = 'r';
/* 8 byte Pad bytes used for polling respone frame */
/*
* Configuration byte:
* - bit 0: define the default NFCID2 entry used when the
* system code is equal to 'FFFF'
* - bit 1: use a random value for lowest 6 bytes of
* NFCID2 value
* - bit 2: ignore polling request frame if request code
* is equal to '01'
* - Other bits are RFU
*/
param[18] = 0x01;
r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
ST21NFCA_RF_CARD_F_NFCID2_LIST, param,
19);
if (r < 0)
return r;
param[0] = 0x02;
r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
ST21NFCA_RF_CARD_F_MODE, param, 1);
}
return r;
}
static void st21nfca_hci_stop_poll(struct nfc_hci_dev *hdev)
{
nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
ST21NFCA_DM_DISCONNECT, NULL, 0, NULL);
}
static int st21nfca_get_iso14443_3_atqa(struct nfc_hci_dev *hdev, u16 *atqa)
{
int r;
struct sk_buff *atqa_skb = NULL;
r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE,
ST21NFCA_RF_READER_14443_3_A_ATQA, &atqa_skb);
if (r < 0)
goto exit;
if (atqa_skb->len != 2) {
r = -EPROTO;
goto exit;
}
*atqa = be16_to_cpu(*(__be16 *) atqa_skb->data);
exit:
kfree_skb(atqa_skb);
return r;
}
static int st21nfca_get_iso14443_3_sak(struct nfc_hci_dev *hdev, u8 *sak)
{
int r;
struct sk_buff *sak_skb = NULL;
r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE,
ST21NFCA_RF_READER_14443_3_A_SAK, &sak_skb);
if (r < 0)
goto exit;
if (sak_skb->len != 1) {
r = -EPROTO;
goto exit;
}
*sak = sak_skb->data[0];
exit:
kfree_skb(sak_skb);
return r;
}
static int st21nfca_get_iso14443_3_uid(struct nfc_hci_dev *hdev, u8 *gate,
int *len)
{
int r;
struct sk_buff *uid_skb = NULL;
r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE,
ST21NFCA_RF_READER_14443_3_A_UID, &uid_skb);
if (r < 0)
goto exit;
if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
r = -EPROTO;
goto exit;
}
gate = uid_skb->data;
*len = uid_skb->len;
exit:
kfree_skb(uid_skb);
return r;
}
static int st21nfca_get_iso15693_inventory(struct nfc_hci_dev *hdev,
struct nfc_target *target)
{
int r;
struct sk_buff *inventory_skb = NULL;
r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_ISO15693_GATE,
ST21NFCA_RF_READER_ISO15693_INVENTORY,
&inventory_skb);
if (r < 0)
goto exit;
skb_pull(inventory_skb, 2);
if (inventory_skb->len == 0 ||
inventory_skb->len > NFC_ISO15693_UID_MAXSIZE) {
r = -EPROTO;
goto exit;
}
memcpy(target->iso15693_uid, inventory_skb->data, inventory_skb->len);
target->iso15693_dsfid = inventory_skb->data[1];
target->is_iso15693 = 1;
exit:
kfree_skb(inventory_skb);
return r;
}
static int st21nfca_hci_dep_link_up(struct nfc_hci_dev *hdev,
struct nfc_target *target, u8 comm_mode,
u8 *gb, size_t gb_len)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
info->dep_info.idx = target->idx;
return st21nfca_im_send_atr_req(hdev, gb, gb_len);
}
static int st21nfca_hci_dep_link_down(struct nfc_hci_dev *hdev)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
info->state = ST21NFCA_ST_READY;
return nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
ST21NFCA_DM_DISCONNECT, NULL, 0, NULL);
}
static int st21nfca_hci_target_from_gate(struct nfc_hci_dev *hdev, u8 gate,
struct nfc_target *target)
{
int r, len;
u16 atqa;
u8 sak;
u8 uid[NFC_NFCID1_MAXSIZE];
switch (gate) {
case ST21NFCA_RF_READER_F_GATE:
target->supported_protocols = NFC_PROTO_FELICA_MASK;
break;
case ST21NFCA_RF_READER_14443_3_A_GATE:
/* ISO14443-3 type 1 or 2 tags */
r = st21nfca_get_iso14443_3_atqa(hdev, &atqa);
if (r < 0)
return r;
if (atqa == 0x000c) {
target->supported_protocols = NFC_PROTO_JEWEL_MASK;
target->sens_res = 0x0c00;
} else {
r = st21nfca_get_iso14443_3_sak(hdev, &sak);
if (r < 0)
return r;
r = st21nfca_get_iso14443_3_uid(hdev, uid, &len);
if (r < 0)
return r;
target->supported_protocols =
nfc_hci_sak_to_protocol(sak);
if (target->supported_protocols == 0xffffffff)
return -EPROTO;
target->sens_res = atqa;
target->sel_res = sak;
memcpy(target->nfcid1, uid, len);
target->nfcid1_len = len;
}
break;
case ST21NFCA_RF_READER_ISO15693_GATE:
target->supported_protocols = NFC_PROTO_ISO15693_MASK;
r = st21nfca_get_iso15693_inventory(hdev, target);
if (r < 0)
return r;
break;
default:
return -EPROTO;
}
return 0;
}
static int st21nfca_hci_complete_target_discovered(struct nfc_hci_dev *hdev,
u8 gate,
struct nfc_target *target)
{
int r;
struct sk_buff *nfcid2_skb = NULL, *nfcid1_skb;
if (gate == ST21NFCA_RF_READER_F_GATE) {
r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_F_GATE,
ST21NFCA_RF_READER_F_NFCID2, &nfcid2_skb);
if (r < 0)
goto exit;
if (nfcid2_skb->len > NFC_SENSF_RES_MAXSIZE) {
r = -EPROTO;
goto exit;
}
/*
* - After the recepton of polling response for type F frame
* at 212 or 424 Kbit/s, NFCID2 registry parameters will be
* updated.
* - After the reception of SEL_RES with NFCIP-1 compliant bit
* set for type A frame NFCID1 will be updated
*/
if (nfcid2_skb->len > 0) {
/* P2P in type F */
memcpy(target->sensf_res, nfcid2_skb->data,
nfcid2_skb->len);
target->sensf_res_len = nfcid2_skb->len;
/* NFC Forum Digital Protocol Table 44 */
if (target->sensf_res[0] == 0x01 &&
target->sensf_res[1] == 0xfe)
target->supported_protocols =
NFC_PROTO_NFC_DEP_MASK;
else
target->supported_protocols =
NFC_PROTO_FELICA_MASK;
} else {
/* P2P in type A */
r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_F_GATE,
ST21NFCA_RF_READER_F_NFCID1,
&nfcid1_skb);
if (r < 0)
goto exit;
if (nfcid1_skb->len > NFC_NFCID1_MAXSIZE) {
r = -EPROTO;
goto exit;
}
memcpy(target->sensf_res, nfcid1_skb->data,
nfcid1_skb->len);
target->sensf_res_len = nfcid1_skb->len;
target->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
}
target->hci_reader_gate = ST21NFCA_RF_READER_F_GATE;
}
r = 1;
exit:
kfree_skb(nfcid2_skb);
return r;
}
#define ST21NFCA_CB_TYPE_READER_ISO15693 1
static void st21nfca_hci_data_exchange_cb(void *context, struct sk_buff *skb,
int err)
{
struct st21nfca_hci_info *info = context;
switch (info->async_cb_type) {
case ST21NFCA_CB_TYPE_READER_ISO15693:
if (err == 0)
skb_trim(skb, skb->len - 1);
info->async_cb(info->async_cb_context, skb, err);
break;
default:
if (err == 0)
kfree_skb(skb);
break;
}
}
/*
* Returns:
* <= 0: driver handled the data exchange
* 1: driver doesn't especially handle, please do standard processing
*/
static int st21nfca_hci_im_transceive(struct nfc_hci_dev *hdev,
struct nfc_target *target,
struct sk_buff *skb,
data_exchange_cb_t cb, void *cb_context)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
pr_info(DRIVER_DESC ": %s for gate=%d len=%d\n", __func__,
target->hci_reader_gate, skb->len);
switch (target->hci_reader_gate) {
case ST21NFCA_RF_READER_F_GATE:
if (target->supported_protocols == NFC_PROTO_NFC_DEP_MASK)
return st21nfca_im_send_dep_req(hdev, skb);
*skb_push(skb, 1) = 0x1a;
return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
ST21NFCA_WR_XCHG_DATA, skb->data,
skb->len, cb, cb_context);
case ST21NFCA_RF_READER_14443_3_A_GATE:
*skb_push(skb, 1) = 0x1a; /* CTR, see spec:10.2.2.1 */
return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
ST21NFCA_WR_XCHG_DATA, skb->data,
skb->len, cb, cb_context);
case ST21NFCA_RF_READER_ISO15693_GATE:
info->async_cb_type = ST21NFCA_CB_TYPE_READER_ISO15693;
info->async_cb = cb;
info->async_cb_context = cb_context;
*skb_push(skb, 1) = 0x17;
return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
ST21NFCA_WR_XCHG_DATA, skb->data,
skb->len,
st21nfca_hci_data_exchange_cb,
info);
break;
default:
return 1;
}
}
static int st21nfca_hci_tm_send(struct nfc_hci_dev *hdev, struct sk_buff *skb)
{
return st21nfca_tm_send_dep_res(hdev, skb);
}
static int st21nfca_hci_check_presence(struct nfc_hci_dev *hdev,
struct nfc_target *target)
{
u8 fwi = 0x11;
switch (target->hci_reader_gate) {
case NFC_HCI_RF_READER_A_GATE:
case NFC_HCI_RF_READER_B_GATE:
/*
* PRESENCE_CHECK on those gates is available
* However, the answer to this command is taking 3 * fwi
* if the card is no present.
* Instead, we send an empty I-Frame with a very short
* configurable fwi ~604µs.
*/
return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
ST21NFCA_WR_XCHG_DATA, &fwi, 1, NULL);
case ST21NFCA_RF_READER_14443_3_A_GATE:
return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
ST21NFCA_RF_READER_CMD_PRESENCE_CHECK,
NULL, 0, NULL);
default:
return -EOPNOTSUPP;
}
}
/*
* Returns:
* <= 0: driver handled the event, skb consumed
* 1: driver does not handle the event, please do standard processing
*/
static int st21nfca_hci_event_received(struct nfc_hci_dev *hdev, u8 gate,
u8 event, struct sk_buff *skb)
{
int r;
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
pr_debug("hci event: %d\n", event);
switch (event) {
case ST21NFCA_EVT_CARD_ACTIVATED:
if (gate == ST21NFCA_RF_CARD_F_GATE)
info->dep_info.curr_nfc_dep_pni = 0;
break;
case ST21NFCA_EVT_CARD_DEACTIVATED:
break;
case ST21NFCA_EVT_FIELD_ON:
break;
case ST21NFCA_EVT_FIELD_OFF:
break;
case ST21NFCA_EVT_SEND_DATA:
if (gate == ST21NFCA_RF_CARD_F_GATE) {
r = st21nfca_tm_event_send_data(hdev, skb, gate);
if (r < 0)
return r;
return 0;
}
info->dep_info.curr_nfc_dep_pni = 0;
return 1;
default:
return 1;
}
kfree_skb(skb);
return 0;
}
static struct nfc_hci_ops st21nfca_hci_ops = {
.open = st21nfca_hci_open,
.close = st21nfca_hci_close,
.load_session = st21nfca_hci_load_session,
.hci_ready = st21nfca_hci_ready,
.xmit = st21nfca_hci_xmit,
.start_poll = st21nfca_hci_start_poll,
.stop_poll = st21nfca_hci_stop_poll,
.dep_link_up = st21nfca_hci_dep_link_up,
.dep_link_down = st21nfca_hci_dep_link_down,
.target_from_gate = st21nfca_hci_target_from_gate,
.complete_target_discovered = st21nfca_hci_complete_target_discovered,
.im_transceive = st21nfca_hci_im_transceive,
.tm_send = st21nfca_hci_tm_send,
.check_presence = st21nfca_hci_check_presence,
.event_received = st21nfca_hci_event_received,
};
int st21nfca_hci_probe(void *phy_id, struct nfc_phy_ops *phy_ops,
char *llc_name, int phy_headroom, int phy_tailroom,
int phy_payload, struct nfc_hci_dev **hdev)
{
struct st21nfca_hci_info *info;
int r = 0;
int dev_num;
u32 protocols;
struct nfc_hci_init_data init_data;
unsigned long quirks = 0;
info = kzalloc(sizeof(struct st21nfca_hci_info), GFP_KERNEL);
if (!info) {
r = -ENOMEM;
goto err_alloc_hdev;
}
info->phy_ops = phy_ops;
info->phy_id = phy_id;
info->state = ST21NFCA_ST_COLD;
mutex_init(&info->info_lock);
init_data.gate_count = ARRAY_SIZE(st21nfca_gates);
memcpy(init_data.gates, st21nfca_gates, sizeof(st21nfca_gates));
/*
* Session id must include the driver name + i2c bus addr
* persistent info to discriminate 2 identical chips
*/
dev_num = find_first_zero_bit(dev_mask, ST21NFCA_NUM_DEVICES);
if (dev_num >= ST21NFCA_NUM_DEVICES)
return -ENODEV;
set_bit(dev_num, dev_mask);
scnprintf(init_data.session_id, sizeof(init_data.session_id), "%s%2x",
"ST21AH", dev_num);
protocols = NFC_PROTO_JEWEL_MASK |
NFC_PROTO_MIFARE_MASK |
NFC_PROTO_FELICA_MASK |
NFC_PROTO_ISO14443_MASK |
NFC_PROTO_ISO14443_B_MASK |
NFC_PROTO_ISO15693_MASK |
NFC_PROTO_NFC_DEP_MASK;
set_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &quirks);
info->hdev =
nfc_hci_allocate_device(&st21nfca_hci_ops, &init_data, quirks,
protocols, llc_name,
phy_headroom + ST21NFCA_CMDS_HEADROOM,
phy_tailroom, phy_payload);
if (!info->hdev) {
pr_err("Cannot allocate nfc hdev.\n");
r = -ENOMEM;
goto err_alloc_hdev;
}
nfc_hci_set_clientdata(info->hdev, info);
r = nfc_hci_register_device(info->hdev);
if (r)
goto err_regdev;
*hdev = info->hdev;
st21nfca_dep_init(info->hdev);
return 0;
err_regdev:
nfc_hci_free_device(info->hdev);
err_alloc_hdev:
kfree(info);
return r;
}
EXPORT_SYMBOL(st21nfca_hci_probe);
void st21nfca_hci_remove(struct nfc_hci_dev *hdev)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
st21nfca_dep_deinit(hdev);
nfc_hci_unregister_device(hdev);
nfc_hci_free_device(hdev);
kfree(info);
}
EXPORT_SYMBOL(st21nfca_hci_remove);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(DRIVER_DESC);

90
drivers/nfc/st21nfca/st21nfca.h Normal file
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@ -0,0 +1,90 @@
/*
* 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_ST21NFCA_H_
#define __LOCAL_ST21NFCA_H_
#include <net/nfc/hci.h>
#include "st21nfca_dep.h"
#define HCI_MODE 0
/* framing in HCI mode */
#define ST21NFCA_SOF_EOF_LEN 2
/* Almost every time value is 0 */
#define ST21NFCA_HCI_LLC_LEN 1
/* Size in worst case :
* In normal case CRC len = 2 but byte stuffing
* may appear in case one CRC byte = ST21NFCA_SOF_EOF
*/
#define ST21NFCA_HCI_LLC_CRC 4
#define ST21NFCA_HCI_LLC_LEN_CRC (ST21NFCA_SOF_EOF_LEN + \
ST21NFCA_HCI_LLC_LEN + \
ST21NFCA_HCI_LLC_CRC)
#define ST21NFCA_HCI_LLC_MIN_SIZE (1 + ST21NFCA_HCI_LLC_LEN_CRC)
/* Worst case when adding byte stuffing between each byte */
#define ST21NFCA_HCI_LLC_MAX_PAYLOAD 29
#define ST21NFCA_HCI_LLC_MAX_SIZE (ST21NFCA_HCI_LLC_LEN_CRC + 1 + \
ST21NFCA_HCI_LLC_MAX_PAYLOAD)
#define DRIVER_DESC "HCI NFC driver for ST21NFCA"
#define ST21NFCA_HCI_MODE 0
#define ST21NFCA_NUM_DEVICES 256
int st21nfca_hci_probe(void *phy_id, struct nfc_phy_ops *phy_ops,
char *llc_name, int phy_headroom, int phy_tailroom,
int phy_payload, struct nfc_hci_dev **hdev);
void st21nfca_hci_remove(struct nfc_hci_dev *hdev);
enum st21nfca_state {
ST21NFCA_ST_COLD,
ST21NFCA_ST_READY,
};
struct st21nfca_hci_info {
struct nfc_phy_ops *phy_ops;
void *phy_id;
struct nfc_hci_dev *hdev;
enum st21nfca_state state;
struct mutex info_lock;
int async_cb_type;
data_exchange_cb_t async_cb;
void *async_cb_context;
struct st21nfca_dep_info dep_info;
};
/* Reader RF commands */
#define ST21NFCA_WR_XCHG_DATA 0x10
#define ST21NFCA_RF_READER_F_GATE 0x14
#define ST21NFCA_RF_CARD_F_GATE 0x24
#define ST21NFCA_EVT_SEND_DATA 0x10
#endif /* __LOCAL_ST21NFCA_H_ */

648
drivers/nfc/st21nfca/st21nfca_dep.c Normal file
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@ -0,0 +1,648 @@
/*
* 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 <net/nfc/hci.h>
#include "st21nfca.h"
#include "st21nfca_dep.h"
#define ST21NFCA_NFCIP1_INITIATOR 0x00
#define ST21NFCA_NFCIP1_REQ 0xd4
#define ST21NFCA_NFCIP1_RES 0xd5
#define ST21NFCA_NFCIP1_ATR_REQ 0x00
#define ST21NFCA_NFCIP1_ATR_RES 0x01
#define ST21NFCA_NFCIP1_PSL_REQ 0x04
#define ST21NFCA_NFCIP1_PSL_RES 0x05
#define ST21NFCA_NFCIP1_DEP_REQ 0x06
#define ST21NFCA_NFCIP1_DEP_RES 0x07
#define ST21NFCA_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03)
#define ST21NFCA_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0)
#define ST21NFCA_NFC_DEP_PFB_IS_TIMEOUT(pfb) \
((pfb) & ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT)
#define ST21NFCA_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & 0x04)
#define ST21NFCA_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08)
#define ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT 0x10
#define ST21NFCA_NFC_DEP_PFB_IS_TIMEOUT(pfb) \
((pfb) & ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT)
#define ST21NFCA_NFC_DEP_PFB_I_PDU 0x00
#define ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU 0x40
#define ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU 0x80
#define ST21NFCA_ATR_REQ_MIN_SIZE 17
#define ST21NFCA_ATR_REQ_MAX_SIZE 65
#define ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B 0x30
#define ST21NFCA_GB_BIT 0x02
#define ST21NFCA_EVT_CARD_F_BITRATE 0x16
#define ST21NFCA_EVT_READER_F_BITRATE 0x13
#define ST21NFCA_PSL_REQ_SEND_SPEED(brs) (brs & 0x38)
#define ST21NFCA_PSL_REQ_RECV_SPEED(brs) (brs & 0x07)
#define ST21NFCA_PP2LRI(pp) ((pp & 0x30) >> 4)
#define ST21NFCA_CARD_BITRATE_212 0x01
#define ST21NFCA_CARD_BITRATE_424 0x02
#define ST21NFCA_DEFAULT_TIMEOUT 0x0a
#define PROTOCOL_ERR(req) pr_err("%d: ST21NFCA Protocol error: %s\n", \
__LINE__, req)
struct st21nfca_atr_req {
u8 length;
u8 cmd0;
u8 cmd1;
u8 nfcid3[NFC_NFCID3_MAXSIZE];
u8 did;
u8 bsi;
u8 bri;
u8 ppi;
u8 gbi[0];
} __packed;
struct st21nfca_atr_res {
u8 length;
u8 cmd0;
u8 cmd1;
u8 nfcid3[NFC_NFCID3_MAXSIZE];
u8 did;
u8 bsi;
u8 bri;
u8 to;
u8 ppi;
u8 gbi[0];
} __packed;
struct st21nfca_psl_req {
u8 length;
u8 cmd0;
u8 cmd1;
u8 did;
u8 brs;
u8 fsl;
} __packed;
struct st21nfca_psl_res {
u8 length;
u8 cmd0;
u8 cmd1;
u8 did;
} __packed;
struct st21nfca_dep_req_res {
u8 length;
u8 cmd0;
u8 cmd1;
u8 pfb;
u8 did;
u8 nad;
} __packed;
static void st21nfca_tx_work(struct work_struct *work)
{
struct st21nfca_hci_info *info = container_of(work,
struct st21nfca_hci_info,
dep_info.tx_work);
struct nfc_dev *dev;
struct sk_buff *skb;
if (info) {
dev = info->hdev->ndev;
skb = info->dep_info.tx_pending;
device_lock(&dev->dev);
nfc_hci_send_cmd_async(info->hdev, ST21NFCA_RF_READER_F_GATE,
ST21NFCA_WR_XCHG_DATA, skb->data, skb->len,
info->async_cb, info);
device_unlock(&dev->dev);
kfree_skb(skb);
}
}
static void st21nfca_im_send_pdu(struct st21nfca_hci_info *info,
struct sk_buff *skb)
{
info->dep_info.tx_pending = skb;
schedule_work(&info->dep_info.tx_work);
}
static int st21nfca_tm_send_atr_res(struct nfc_hci_dev *hdev,
struct st21nfca_atr_req *atr_req)
{
struct st21nfca_atr_res *atr_res;
struct sk_buff *skb;
size_t gb_len;
int r;
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
gb_len = atr_req->length - sizeof(struct st21nfca_atr_req);
skb = alloc_skb(atr_req->length + 1, GFP_KERNEL);
if (!skb)
return -ENOMEM;
skb_put(skb, sizeof(struct st21nfca_atr_res));
atr_res = (struct st21nfca_atr_res *)skb->data;
memset(atr_res, 0, sizeof(struct st21nfca_atr_res));
atr_res->length = atr_req->length + 1;
atr_res->cmd0 = ST21NFCA_NFCIP1_RES;
atr_res->cmd1 = ST21NFCA_NFCIP1_ATR_RES;
memcpy(atr_res->nfcid3, atr_req->nfcid3, 6);
atr_res->bsi = 0x00;
atr_res->bri = 0x00;
atr_res->to = ST21NFCA_DEFAULT_TIMEOUT;
atr_res->ppi = ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B;
if (gb_len) {
skb_put(skb, gb_len);
atr_res->ppi |= ST21NFCA_GB_BIT;
memcpy(atr_res->gbi, atr_req->gbi, gb_len);
r = nfc_set_remote_general_bytes(hdev->ndev, atr_res->gbi,
gb_len);
if (r < 0)
return r;
}
info->dep_info.curr_nfc_dep_pni = 0;
r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
kfree_skb(skb);
return r;
}
static int st21nfca_tm_recv_atr_req(struct nfc_hci_dev *hdev,
struct sk_buff *skb)
{
struct st21nfca_atr_req *atr_req;
size_t gb_len;
int r;
skb_trim(skb, skb->len - 1);
if (!skb->len) {
r = -EIO;
goto exit;
}
if (skb->len < ST21NFCA_ATR_REQ_MIN_SIZE) {
r = -EPROTO;
goto exit;
}
atr_req = (struct st21nfca_atr_req *)skb->data;
if (atr_req->length < sizeof(struct st21nfca_atr_req)) {
r = -EPROTO;
goto exit;
}
r = st21nfca_tm_send_atr_res(hdev, atr_req);
if (r)
goto exit;
gb_len = skb->len - sizeof(struct st21nfca_atr_req);
r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
NFC_COMM_PASSIVE, atr_req->gbi, gb_len);
if (r)
goto exit;
r = 0;
exit:
return r;
}
static int st21nfca_tm_send_psl_res(struct nfc_hci_dev *hdev,
struct st21nfca_psl_req *psl_req)
{
struct st21nfca_psl_res *psl_res;
struct sk_buff *skb;
u8 bitrate[2] = {0, 0};
int r;
skb = alloc_skb(sizeof(struct st21nfca_psl_res), GFP_KERNEL);
if (!skb)
return -ENOMEM;
skb_put(skb, sizeof(struct st21nfca_psl_res));
psl_res = (struct st21nfca_psl_res *)skb->data;
psl_res->length = sizeof(struct st21nfca_psl_res);
psl_res->cmd0 = ST21NFCA_NFCIP1_RES;
psl_res->cmd1 = ST21NFCA_NFCIP1_PSL_RES;
psl_res->did = psl_req->did;
r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
if (r < 0)
goto error;
/*
* ST21NFCA only support P2P passive.
* PSL_REQ BRS value != 0 has only a meaning to
* change technology to type F.
* We change to BITRATE 424Kbits.
* In other case switch to BITRATE 106Kbits.
*/
if (ST21NFCA_PSL_REQ_SEND_SPEED(psl_req->brs) &&
ST21NFCA_PSL_REQ_RECV_SPEED(psl_req->brs)) {
bitrate[0] = ST21NFCA_CARD_BITRATE_424;
bitrate[1] = ST21NFCA_CARD_BITRATE_424;
}
/* Send an event to change bitrate change event to card f */
r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
ST21NFCA_EVT_CARD_F_BITRATE, bitrate, 2);
error:
kfree_skb(skb);
return r;
}
static int st21nfca_tm_recv_psl_req(struct nfc_hci_dev *hdev,
struct sk_buff *skb)
{
struct st21nfca_psl_req *psl_req;
int r;
skb_trim(skb, skb->len - 1);
if (!skb->len) {
r = -EIO;
goto exit;
}
psl_req = (struct st21nfca_psl_req *)skb->data;
if (skb->len < sizeof(struct st21nfca_psl_req)) {
r = -EIO;
goto exit;
}
r = st21nfca_tm_send_psl_res(hdev, psl_req);
exit:
return r;
}
int st21nfca_tm_send_dep_res(struct nfc_hci_dev *hdev, struct sk_buff *skb)
{
int r;
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
*skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
*skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_RES;
*skb_push(skb, 1) = ST21NFCA_NFCIP1_RES;
*skb_push(skb, 1) = skb->len;
r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
kfree_skb(skb);
return r;
}
EXPORT_SYMBOL(st21nfca_tm_send_dep_res);
static int st21nfca_tm_recv_dep_req(struct nfc_hci_dev *hdev,
struct sk_buff *skb)
{
struct st21nfca_dep_req_res *dep_req;
u8 size;
int r;
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
skb_trim(skb, skb->len - 1);
size = 4;
dep_req = (struct st21nfca_dep_req_res *)skb->data;
if (skb->len < size) {
r = -EIO;
goto exit;
}
if (ST21NFCA_NFC_DEP_DID_BIT_SET(dep_req->pfb))
size++;
if (ST21NFCA_NFC_DEP_NAD_BIT_SET(dep_req->pfb))
size++;
if (skb->len < size) {
r = -EIO;
goto exit;
}
/* Receiving DEP_REQ - Decoding */
switch (ST21NFCA_NFC_DEP_PFB_TYPE(dep_req->pfb)) {
case ST21NFCA_NFC_DEP_PFB_I_PDU:
info->dep_info.curr_nfc_dep_pni =
ST21NFCA_NFC_DEP_PFB_PNI(dep_req->pfb);
break;
case ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU:
pr_err("Received a ACK/NACK PDU\n");
break;
case ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU:
pr_err("Received a SUPERVISOR PDU\n");
break;
}
skb_pull(skb, size);
return nfc_tm_data_received(hdev->ndev, skb);
exit:
return r;
}
int st21nfca_tm_event_send_data(struct nfc_hci_dev *hdev, struct sk_buff *skb,
u8 gate)
{
u8 cmd0, cmd1;
int r;
cmd0 = skb->data[1];
switch (cmd0) {
case ST21NFCA_NFCIP1_REQ:
cmd1 = skb->data[2];
switch (cmd1) {
case ST21NFCA_NFCIP1_ATR_REQ:
r = st21nfca_tm_recv_atr_req(hdev, skb);
break;
case ST21NFCA_NFCIP1_PSL_REQ:
r = st21nfca_tm_recv_psl_req(hdev, skb);
break;
case ST21NFCA_NFCIP1_DEP_REQ:
r = st21nfca_tm_recv_dep_req(hdev, skb);
break;
default:
return 1;
}
default:
return 1;
}
return r;
}
EXPORT_SYMBOL(st21nfca_tm_event_send_data);
static void st21nfca_im_send_psl_req(struct nfc_hci_dev *hdev, u8 did, u8 bsi,
u8 bri, u8 lri)
{
struct sk_buff *skb;
struct st21nfca_psl_req *psl_req;
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
skb =
alloc_skb(sizeof(struct st21nfca_psl_req) + 1, GFP_KERNEL);
if (!skb)
return;
skb_reserve(skb, 1);
skb_put(skb, sizeof(struct st21nfca_psl_req));
psl_req = (struct st21nfca_psl_req *) skb->data;
psl_req->length = sizeof(struct st21nfca_psl_req);
psl_req->cmd0 = ST21NFCA_NFCIP1_REQ;
psl_req->cmd1 = ST21NFCA_NFCIP1_PSL_REQ;
psl_req->did = did;
psl_req->brs = (0x30 & bsi << 4) | (bri & 0x03);
psl_req->fsl = lri;
*skb_push(skb, 1) = info->dep_info.to | 0x10;
st21nfca_im_send_pdu(info, skb);
}
#define ST21NFCA_CB_TYPE_READER_F 1
static void st21nfca_im_recv_atr_res_cb(void *context, struct sk_buff *skb,
int err)
{
struct st21nfca_hci_info *info = context;
struct st21nfca_atr_res *atr_res;
int r;
if (err != 0)
return;
if (!skb)
return;
switch (info->async_cb_type) {
case ST21NFCA_CB_TYPE_READER_F:
skb_trim(skb, skb->len - 1);
atr_res = (struct st21nfca_atr_res *)skb->data;
r = nfc_set_remote_general_bytes(info->hdev->ndev,
atr_res->gbi,
skb->len - sizeof(struct st21nfca_atr_res));
if (r < 0)
return;
if (atr_res->to >= 0x0e)
info->dep_info.to = 0x0e;
else
info->dep_info.to = atr_res->to + 1;
info->dep_info.to |= 0x10;
r = nfc_dep_link_is_up(info->hdev->ndev, info->dep_info.idx,
NFC_COMM_PASSIVE, NFC_RF_INITIATOR);
if (r < 0)
return;
info->dep_info.curr_nfc_dep_pni = 0;
if (ST21NFCA_PP2LRI(atr_res->ppi) != info->dep_info.lri)
st21nfca_im_send_psl_req(info->hdev, atr_res->did,
atr_res->bsi, atr_res->bri,
ST21NFCA_PP2LRI(atr_res->ppi));
break;
default:
kfree_skb(skb);
break;
}
}
int st21nfca_im_send_atr_req(struct nfc_hci_dev *hdev, u8 *gb, size_t gb_len)
{
struct sk_buff *skb;
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
struct st21nfca_atr_req *atr_req;
struct nfc_target *target;
uint size;
info->dep_info.to = ST21NFCA_DEFAULT_TIMEOUT;
size = ST21NFCA_ATR_REQ_MIN_SIZE + gb_len;
if (size > ST21NFCA_ATR_REQ_MAX_SIZE) {
PROTOCOL_ERR("14.6.1.1");
return -EINVAL;
}
skb =
alloc_skb(sizeof(struct st21nfca_atr_req) + gb_len + 1, GFP_KERNEL);
if (!skb)
return -ENOMEM;
skb_reserve(skb, 1);
skb_put(skb, sizeof(struct st21nfca_atr_req));
atr_req = (struct st21nfca_atr_req *)skb->data;
memset(atr_req, 0, sizeof(struct st21nfca_atr_req));
atr_req->cmd0 = ST21NFCA_NFCIP1_REQ;
atr_req->cmd1 = ST21NFCA_NFCIP1_ATR_REQ;
memset(atr_req->nfcid3, 0, NFC_NFCID3_MAXSIZE);
target = hdev->ndev->targets;
if (target->sensf_res_len > 0)
memcpy(atr_req->nfcid3, target->sensf_res,
target->sensf_res_len);
else
get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE);
atr_req->did = 0x0;
atr_req->bsi = 0x00;
atr_req->bri = 0x00;
atr_req->ppi = ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B;
if (gb_len) {
atr_req->ppi |= ST21NFCA_GB_BIT;
memcpy(skb_put(skb, gb_len), gb, gb_len);
}
atr_req->length = sizeof(struct st21nfca_atr_req) + hdev->gb_len;
*skb_push(skb, 1) = info->dep_info.to | 0x10; /* timeout */
info->async_cb_type = ST21NFCA_CB_TYPE_READER_F;
info->async_cb_context = info;
info->async_cb = st21nfca_im_recv_atr_res_cb;
info->dep_info.bri = atr_req->bri;
info->dep_info.bsi = atr_req->bsi;
info->dep_info.lri = ST21NFCA_PP2LRI(atr_req->ppi);
return nfc_hci_send_cmd_async(hdev, ST21NFCA_RF_READER_F_GATE,
ST21NFCA_WR_XCHG_DATA, skb->data,
skb->len, info->async_cb, info);
}
EXPORT_SYMBOL(st21nfca_im_send_atr_req);
static void st21nfca_im_recv_dep_res_cb(void *context, struct sk_buff *skb,
int err)
{
struct st21nfca_hci_info *info = context;
struct st21nfca_dep_req_res *dep_res;
int size;
if (err != 0)
return;
if (!skb)
return;
switch (info->async_cb_type) {
case ST21NFCA_CB_TYPE_READER_F:
dep_res = (struct st21nfca_dep_req_res *)skb->data;
size = 3;
if (skb->len < size)
goto exit;
if (ST21NFCA_NFC_DEP_DID_BIT_SET(dep_res->pfb))
size++;
if (ST21NFCA_NFC_DEP_NAD_BIT_SET(dep_res->pfb))
size++;
if (skb->len < size)
goto exit;
skb_trim(skb, skb->len - 1);
/* Receiving DEP_REQ - Decoding */
switch (ST21NFCA_NFC_DEP_PFB_TYPE(dep_res->pfb)) {
case ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU:
pr_err("Received a ACK/NACK PDU\n");
case ST21NFCA_NFC_DEP_PFB_I_PDU:
info->dep_info.curr_nfc_dep_pni =
ST21NFCA_NFC_DEP_PFB_PNI(dep_res->pfb + 1);
size++;
skb_pull(skb, size);
nfc_tm_data_received(info->hdev->ndev, skb);
break;
case ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU:
pr_err("Received a SUPERVISOR PDU\n");
skb_pull(skb, size);
*skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
*skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
*skb_push(skb, 1) = skb->len;
*skb_push(skb, 1) = info->dep_info.to | 0x10;
st21nfca_im_send_pdu(info, skb);
break;
}
return;
default:
break;
}
exit:
kfree_skb(skb);
}
int st21nfca_im_send_dep_req(struct nfc_hci_dev *hdev, struct sk_buff *skb)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
info->async_cb_type = ST21NFCA_CB_TYPE_READER_F;
info->async_cb_context = info;
info->async_cb = st21nfca_im_recv_dep_res_cb;
*skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
*skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
*skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
*skb_push(skb, 1) = skb->len;
*skb_push(skb, 1) = info->dep_info.to | 0x10;
return nfc_hci_send_cmd_async(hdev, ST21NFCA_RF_READER_F_GATE,
ST21NFCA_WR_XCHG_DATA,
skb->data, skb->len,
info->async_cb, info);
}
EXPORT_SYMBOL(st21nfca_im_send_dep_req);
void st21nfca_dep_init(struct nfc_hci_dev *hdev)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
INIT_WORK(&info->dep_info.tx_work, st21nfca_tx_work);
info->dep_info.curr_nfc_dep_pni = 0;
info->dep_info.idx = 0;
info->dep_info.to = ST21NFCA_DEFAULT_TIMEOUT;
}
EXPORT_SYMBOL(st21nfca_dep_init);
void st21nfca_dep_deinit(struct nfc_hci_dev *hdev)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
cancel_work_sync(&info->dep_info.tx_work);
}
EXPORT_SYMBOL(st21nfca_dep_deinit);

43
drivers/nfc/st21nfca/st21nfca_dep.h Normal file
View file

@ -0,0 +1,43 @@
/*
* 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_DEP_H
#define __ST21NFCA_DEP_H
#include <linux/skbuff.h>
#include <linux/workqueue.h>
struct st21nfca_dep_info {
struct sk_buff *tx_pending;
struct work_struct tx_work;
u8 curr_nfc_dep_pni;
u32 idx;
u8 to;
u8 did;
u8 bsi;
u8 bri;
u8 lri;
} __packed;
int st21nfca_tm_event_send_data(struct nfc_hci_dev *hdev, struct sk_buff *skb,
u8 gate);
int st21nfca_tm_send_dep_res(struct nfc_hci_dev *hdev, struct sk_buff *skb);
int st21nfca_im_send_atr_req(struct nfc_hci_dev *hdev, u8 *gb, size_t gb_len);
int st21nfca_im_send_dep_req(struct nfc_hci_dev *hdev, struct sk_buff *skb);
void st21nfca_dep_init(struct nfc_hci_dev *hdev);
void st21nfca_dep_deinit(struct nfc_hci_dev *hdev);
#endif /* __ST21NFCA_DEP_H */