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WSL2-Linux-Kernel/drivers/nfc/pn544/i2c.c

1199 строки
29 KiB
C
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/*
* I2C Link Layer for PN544 HCI based Driver
*
* Copyright (C) 2012 Intel Corporation. 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_gpio.h>
#include <linux/of_irq.h>
#include <linux/acpi.h>
#include <linux/miscdevice.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/nfc.h>
#include <linux/firmware.h>
#include <linux/gpio/consumer.h>
#include <linux/platform_data/pn544.h>
#include <asm/unaligned.h>
#include <net/nfc/hci.h>
#include <net/nfc/llc.h>
#include <net/nfc/nfc.h>
#include "pn544.h"
#define PN544_I2C_FRAME_HEADROOM 1
#define PN544_I2C_FRAME_TAILROOM 2
/* GPIO names */
#define PN544_GPIO_NAME_IRQ "pn544_irq"
#define PN544_GPIO_NAME_FW "pn544_fw"
#define PN544_GPIO_NAME_EN "pn544_en"
/* framing in HCI mode */
#define PN544_HCI_I2C_LLC_LEN 1
#define PN544_HCI_I2C_LLC_CRC 2
#define PN544_HCI_I2C_LLC_LEN_CRC (PN544_HCI_I2C_LLC_LEN + \
PN544_HCI_I2C_LLC_CRC)
#define PN544_HCI_I2C_LLC_MIN_SIZE (1 + PN544_HCI_I2C_LLC_LEN_CRC)
#define PN544_HCI_I2C_LLC_MAX_PAYLOAD 29
#define PN544_HCI_I2C_LLC_MAX_SIZE (PN544_HCI_I2C_LLC_LEN_CRC + 1 + \
PN544_HCI_I2C_LLC_MAX_PAYLOAD)
static struct i2c_device_id pn544_hci_i2c_id_table[] = {
{"pn544", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, pn544_hci_i2c_id_table);
static const struct acpi_device_id pn544_hci_i2c_acpi_match[] = {
{"NXP5440", 0},
{}
};
MODULE_DEVICE_TABLE(acpi, pn544_hci_i2c_acpi_match);
#define PN544_HCI_I2C_DRIVER_NAME "pn544_hci_i2c"
/*
* Exposed through the 4 most significant bytes
* from the HCI SW_VERSION first byte, a.k.a.
* SW RomLib.
*/
#define PN544_HW_VARIANT_C2 0xa
#define PN544_HW_VARIANT_C3 0xb
#define PN544_FW_CMD_RESET 0x01
#define PN544_FW_CMD_WRITE 0x08
#define PN544_FW_CMD_CHECK 0x06
#define PN544_FW_CMD_SECURE_WRITE 0x0C
#define PN544_FW_CMD_SECURE_CHUNK_WRITE 0x0D
struct pn544_i2c_fw_frame_write {
u8 cmd;
u16 be_length;
u8 be_dest_addr[3];
u16 be_datalen;
u8 data[];
} __packed;
struct pn544_i2c_fw_frame_check {
u8 cmd;
u16 be_length;
u8 be_start_addr[3];
u16 be_datalen;
u16 be_crc;
} __packed;
struct pn544_i2c_fw_frame_response {
u8 status;
u16 be_length;
} __packed;
struct pn544_i2c_fw_blob {
u32 be_size;
u32 be_destaddr;
u8 data[];
};
struct pn544_i2c_fw_secure_frame {
u8 cmd;
u16 be_datalen;
u8 data[];
} __packed;
struct pn544_i2c_fw_secure_blob {
u64 header;
u8 data[];
};
#define PN544_FW_CMD_RESULT_TIMEOUT 0x01
#define PN544_FW_CMD_RESULT_BAD_CRC 0x02
#define PN544_FW_CMD_RESULT_ACCESS_DENIED 0x08
#define PN544_FW_CMD_RESULT_PROTOCOL_ERROR 0x0B
#define PN544_FW_CMD_RESULT_INVALID_PARAMETER 0x11
#define PN544_FW_CMD_RESULT_UNSUPPORTED_COMMAND 0x13
#define PN544_FW_CMD_RESULT_INVALID_LENGTH 0x18
#define PN544_FW_CMD_RESULT_CRYPTOGRAPHIC_ERROR 0x19
#define PN544_FW_CMD_RESULT_VERSION_CONDITIONS_ERROR 0x1D
#define PN544_FW_CMD_RESULT_MEMORY_ERROR 0x20
#define PN544_FW_CMD_RESULT_CHUNK_OK 0x21
#define PN544_FW_CMD_RESULT_WRITE_FAILED 0x74
#define PN544_FW_CMD_RESULT_COMMAND_REJECTED 0xE0
#define PN544_FW_CMD_RESULT_CHUNK_ERROR 0xE6
#define MIN(X, Y) ((X) < (Y) ? (X) : (Y))
#define PN544_FW_WRITE_BUFFER_MAX_LEN 0x9f7
#define PN544_FW_I2C_MAX_PAYLOAD PN544_HCI_I2C_LLC_MAX_SIZE
#define PN544_FW_I2C_WRITE_FRAME_HEADER_LEN 8
#define PN544_FW_I2C_WRITE_DATA_MAX_LEN MIN((PN544_FW_I2C_MAX_PAYLOAD -\
PN544_FW_I2C_WRITE_FRAME_HEADER_LEN),\
PN544_FW_WRITE_BUFFER_MAX_LEN)
#define PN544_FW_SECURE_CHUNK_WRITE_HEADER_LEN 3
#define PN544_FW_SECURE_CHUNK_WRITE_DATA_MAX_LEN (PN544_FW_I2C_MAX_PAYLOAD -\
PN544_FW_SECURE_CHUNK_WRITE_HEADER_LEN)
#define PN544_FW_SECURE_FRAME_HEADER_LEN 3
#define PN544_FW_SECURE_BLOB_HEADER_LEN 8
#define FW_WORK_STATE_IDLE 1
#define FW_WORK_STATE_START 2
#define FW_WORK_STATE_WAIT_WRITE_ANSWER 3
#define FW_WORK_STATE_WAIT_CHECK_ANSWER 4
#define FW_WORK_STATE_WAIT_SECURE_WRITE_ANSWER 5
struct pn544_i2c_phy {
struct i2c_client *i2c_dev;
struct nfc_hci_dev *hdev;
unsigned int gpio_en;
unsigned int gpio_irq;
unsigned int gpio_fw;
unsigned int en_polarity;
u8 hw_variant;
struct work_struct fw_work;
int fw_work_state;
char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
const struct firmware *fw;
u32 fw_blob_dest_addr;
size_t fw_blob_size;
const u8 *fw_blob_data;
size_t fw_written;
size_t fw_size;
int fw_cmd_result;
int powered;
int run_mode;
int hard_fault; /*
* < 0 if hardware error occured (e.g. i2c err)
* and prevents normal operation.
*/
};
#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 void pn544_hci_i2c_platform_init(struct pn544_i2c_phy *phy)
{
int polarity, retry, ret;
char rset_cmd[] = { 0x05, 0xF9, 0x04, 0x00, 0xC3, 0xE5 };
int count = sizeof(rset_cmd);
nfc_info(&phy->i2c_dev->dev, "Detecting nfc_en polarity\n");
/* Disable fw download */
gpio_set_value_cansleep(phy->gpio_fw, 0);
for (polarity = 0; polarity < 2; polarity++) {
phy->en_polarity = polarity;
retry = 3;
while (retry--) {
/* power off */
gpio_set_value_cansleep(phy->gpio_en,
!phy->en_polarity);
usleep_range(10000, 15000);
/* power on */
gpio_set_value_cansleep(phy->gpio_en, phy->en_polarity);
usleep_range(10000, 15000);
/* send reset */
dev_dbg(&phy->i2c_dev->dev, "Sending reset cmd\n");
ret = i2c_master_send(phy->i2c_dev, rset_cmd, count);
if (ret == count) {
nfc_info(&phy->i2c_dev->dev,
"nfc_en polarity : active %s\n",
(polarity == 0 ? "low" : "high"));
goto out;
}
}
}
nfc_err(&phy->i2c_dev->dev,
"Could not detect nfc_en polarity, fallback to active high\n");
out:
gpio_set_value_cansleep(phy->gpio_en, !phy->en_polarity);
}
static void pn544_hci_i2c_enable_mode(struct pn544_i2c_phy *phy, int run_mode)
{
gpio_set_value_cansleep(phy->gpio_fw,
run_mode == PN544_FW_MODE ? 1 : 0);
gpio_set_value_cansleep(phy->gpio_en, phy->en_polarity);
usleep_range(10000, 15000);
phy->run_mode = run_mode;
}
static int pn544_hci_i2c_enable(void *phy_id)
{
struct pn544_i2c_phy *phy = phy_id;
pr_info("%s\n", __func__);
pn544_hci_i2c_enable_mode(phy, PN544_HCI_MODE);
phy->powered = 1;
return 0;
}
static void pn544_hci_i2c_disable(void *phy_id)
{
struct pn544_i2c_phy *phy = phy_id;
gpio_set_value_cansleep(phy->gpio_fw, 0);
gpio_set_value_cansleep(phy->gpio_en, !phy->en_polarity);
usleep_range(10000, 15000);
gpio_set_value_cansleep(phy->gpio_en, phy->en_polarity);
usleep_range(10000, 15000);
gpio_set_value_cansleep(phy->gpio_en, !phy->en_polarity);
usleep_range(10000, 15000);
phy->powered = 0;
}
static void pn544_hci_i2c_add_len_crc(struct sk_buff *skb)
{
u16 crc;
int len;
len = skb->len + 2;
*skb_push(skb, 1) = len;
crc = crc_ccitt(0xffff, skb->data, skb->len);
crc = ~crc;
*skb_put(skb, 1) = crc & 0xff;
*skb_put(skb, 1) = crc >> 8;
}
static void pn544_hci_i2c_remove_len_crc(struct sk_buff *skb)
{
skb_pull(skb, PN544_I2C_FRAME_HEADROOM);
skb_trim(skb, PN544_I2C_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 pn544_hci_i2c_write(void *phy_id, struct sk_buff *skb)
{
int r;
struct pn544_i2c_phy *phy = phy_id;
struct i2c_client *client = phy->i2c_dev;
if (phy->hard_fault != 0)
return phy->hard_fault;
usleep_range(3000, 6000);
pn544_hci_i2c_add_len_crc(skb);
I2C_DUMP_SKB("i2c frame written", skb);
r = i2c_master_send(client, skb->data, skb->len);
if (r == -EREMOTEIO) { /* Retry, chip was in standby */
usleep_range(6000, 10000);
r = i2c_master_send(client, skb->data, skb->len);
}
if (r >= 0) {
if (r != skb->len)
r = -EREMOTEIO;
else
r = 0;
}
pn544_hci_i2c_remove_len_crc(skb);
return r;
}
static int check_crc(u8 *buf, int buflen)
{
int len;
u16 crc;
len = buf[0] + 1;
crc = crc_ccitt(0xffff, buf, len - 2);
crc = ~crc;
if (buf[len - 2] != (crc & 0xff) || buf[len - 1] != (crc >> 8)) {
pr_err("CRC error 0x%x != 0x%x 0x%x\n",
crc, buf[len - 1], buf[len - 2]);
pr_info("%s: BAD CRC\n", __func__);
print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
16, 2, buf, buflen, false);
return -EPERM;
}
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:
* -EREMOTEIO : i2c read error (fatal)
* -EBADMSG : frame was incorrect and discarded
* -ENOMEM : cannot allocate skb, frame dropped
*/
static int pn544_hci_i2c_read(struct pn544_i2c_phy *phy, struct sk_buff **skb)
{
int r;
u8 len;
u8 tmp[PN544_HCI_I2C_LLC_MAX_SIZE - 1];
struct i2c_client *client = phy->i2c_dev;
r = i2c_master_recv(client, &len, 1);
if (r != 1) {
nfc_err(&client->dev, "cannot read len byte\n");
return -EREMOTEIO;
}
if ((len < (PN544_HCI_I2C_LLC_MIN_SIZE - 1)) ||
(len > (PN544_HCI_I2C_LLC_MAX_SIZE - 1))) {
nfc_err(&client->dev, "invalid len byte\n");
r = -EBADMSG;
goto flush;
}
*skb = alloc_skb(1 + len, GFP_KERNEL);
if (*skb == NULL) {
r = -ENOMEM;
goto flush;
}
*skb_put(*skb, 1) = len;
r = i2c_master_recv(client, skb_put(*skb, len), len);
if (r != len) {
kfree_skb(*skb);
return -EREMOTEIO;
}
I2C_DUMP_SKB("i2c frame read", *skb);
r = check_crc((*skb)->data, (*skb)->len);
if (r != 0) {
kfree_skb(*skb);
r = -EBADMSG;
goto flush;
}
skb_pull(*skb, 1);
skb_trim(*skb, (*skb)->len - 2);
usleep_range(3000, 6000);
return 0;
flush:
if (i2c_master_recv(client, tmp, sizeof(tmp)) < 0)
r = -EREMOTEIO;
usleep_range(3000, 6000);
return r;
}
static int pn544_hci_i2c_fw_read_status(struct pn544_i2c_phy *phy)
{
int r;
struct pn544_i2c_fw_frame_response response;
struct i2c_client *client = phy->i2c_dev;
r = i2c_master_recv(client, (char *) &response, sizeof(response));
if (r != sizeof(response)) {
nfc_err(&client->dev, "cannot read fw status\n");
return -EIO;
}
usleep_range(3000, 6000);
switch (response.status) {
case 0:
return 0;
case PN544_FW_CMD_RESULT_CHUNK_OK:
return response.status;
case PN544_FW_CMD_RESULT_TIMEOUT:
return -ETIMEDOUT;
case PN544_FW_CMD_RESULT_BAD_CRC:
return -ENODATA;
case PN544_FW_CMD_RESULT_ACCESS_DENIED:
return -EACCES;
case PN544_FW_CMD_RESULT_PROTOCOL_ERROR:
return -EPROTO;
case PN544_FW_CMD_RESULT_INVALID_PARAMETER:
return -EINVAL;
case PN544_FW_CMD_RESULT_UNSUPPORTED_COMMAND:
return -ENOTSUPP;
case PN544_FW_CMD_RESULT_INVALID_LENGTH:
return -EBADMSG;
case PN544_FW_CMD_RESULT_CRYPTOGRAPHIC_ERROR:
return -ENOKEY;
case PN544_FW_CMD_RESULT_VERSION_CONDITIONS_ERROR:
return -EINVAL;
case PN544_FW_CMD_RESULT_MEMORY_ERROR:
return -ENOMEM;
case PN544_FW_CMD_RESULT_COMMAND_REJECTED:
return -EACCES;
case PN544_FW_CMD_RESULT_WRITE_FAILED:
case PN544_FW_CMD_RESULT_CHUNK_ERROR:
return -EIO;
default:
return -EIO;
}
}
/*
* Reads an shdlc frame from the chip. This is not as straightforward as it
* seems. There are cases where we could loose the frame start synchronization.
* The frame format is len-data-crc, and corruption can occur anywhere while
* transiting on i2c bus, such that we could read an invalid len.
* In order to recover synchronization with the next frame, we must be sure
* to read the real amount of data without using the len byte. We do this by
* assuming the following:
* - the chip will always present only one single complete frame on the bus
* before triggering the interrupt
* - the chip will not present a new frame until we have completely read
* the previous one (or until we have handled the interrupt).
* The tricky case is when we read a corrupted len that is less than the real
* len. We must detect this here in order to determine that we need to flush
* the bus. This is the reason why we check the crc here.
*/
static irqreturn_t pn544_hci_i2c_irq_thread_fn(int irq, void *phy_id)
{
struct pn544_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 != 0)
return IRQ_HANDLED;
if (phy->run_mode == PN544_FW_MODE) {
phy->fw_cmd_result = pn544_hci_i2c_fw_read_status(phy);
schedule_work(&phy->fw_work);
} else {
r = pn544_hci_i2c_read(phy, &skb);
if (r == -EREMOTEIO) {
phy->hard_fault = r;
nfc_hci_recv_frame(phy->hdev, NULL);
return IRQ_HANDLED;
} else if ((r == -ENOMEM) || (r == -EBADMSG)) {
return IRQ_HANDLED;
}
nfc_hci_recv_frame(phy->hdev, skb);
}
return IRQ_HANDLED;
}
static struct nfc_phy_ops i2c_phy_ops = {
.write = pn544_hci_i2c_write,
.enable = pn544_hci_i2c_enable,
.disable = pn544_hci_i2c_disable,
};
static int pn544_hci_i2c_fw_download(void *phy_id, const char *firmware_name,
u8 hw_variant)
{
struct pn544_i2c_phy *phy = phy_id;
pr_info("Starting Firmware Download (%s)\n", firmware_name);
strcpy(phy->firmware_name, firmware_name);
phy->hw_variant = hw_variant;
phy->fw_work_state = FW_WORK_STATE_START;
schedule_work(&phy->fw_work);
return 0;
}
static void pn544_hci_i2c_fw_work_complete(struct pn544_i2c_phy *phy,
int result)
{
pr_info("Firmware Download Complete, result=%d\n", result);
pn544_hci_i2c_disable(phy);
phy->fw_work_state = FW_WORK_STATE_IDLE;
if (phy->fw) {
release_firmware(phy->fw);
phy->fw = NULL;
}
nfc_fw_download_done(phy->hdev->ndev, phy->firmware_name, (u32) -result);
}
static int pn544_hci_i2c_fw_write_cmd(struct i2c_client *client, u32 dest_addr,
const u8 *data, u16 datalen)
{
u8 frame[PN544_FW_I2C_MAX_PAYLOAD];
struct pn544_i2c_fw_frame_write *framep;
u16 params_len;
int framelen;
int r;
if (datalen > PN544_FW_I2C_WRITE_DATA_MAX_LEN)
datalen = PN544_FW_I2C_WRITE_DATA_MAX_LEN;
framep = (struct pn544_i2c_fw_frame_write *) frame;
params_len = sizeof(framep->be_dest_addr) +
sizeof(framep->be_datalen) + datalen;
framelen = params_len + sizeof(framep->cmd) +
sizeof(framep->be_length);
framep->cmd = PN544_FW_CMD_WRITE;
put_unaligned_be16(params_len, &framep->be_length);
framep->be_dest_addr[0] = (dest_addr & 0xff0000) >> 16;
framep->be_dest_addr[1] = (dest_addr & 0xff00) >> 8;
framep->be_dest_addr[2] = dest_addr & 0xff;
put_unaligned_be16(datalen, &framep->be_datalen);
memcpy(framep->data, data, datalen);
r = i2c_master_send(client, frame, framelen);
if (r == framelen)
return datalen;
else if (r < 0)
return r;
else
return -EIO;
}
static int pn544_hci_i2c_fw_check_cmd(struct i2c_client *client, u32 start_addr,
const u8 *data, u16 datalen)
{
struct pn544_i2c_fw_frame_check frame;
int r;
u16 crc;
/* calculate local crc for the data we want to check */
crc = crc_ccitt(0xffff, data, datalen);
frame.cmd = PN544_FW_CMD_CHECK;
put_unaligned_be16(sizeof(frame.be_start_addr) +
sizeof(frame.be_datalen) + sizeof(frame.be_crc),
&frame.be_length);
/* tell the chip the memory region to which our crc applies */
frame.be_start_addr[0] = (start_addr & 0xff0000) >> 16;
frame.be_start_addr[1] = (start_addr & 0xff00) >> 8;
frame.be_start_addr[2] = start_addr & 0xff;
put_unaligned_be16(datalen, &frame.be_datalen);
/*
* and give our local crc. Chip will calculate its own crc for the
* region and compare with ours.
*/
put_unaligned_be16(crc, &frame.be_crc);
r = i2c_master_send(client, (const char *) &frame, sizeof(frame));
if (r == sizeof(frame))
return 0;
else if (r < 0)
return r;
else
return -EIO;
}
static int pn544_hci_i2c_fw_write_chunk(struct pn544_i2c_phy *phy)
{
int r;
r = pn544_hci_i2c_fw_write_cmd(phy->i2c_dev,
phy->fw_blob_dest_addr + phy->fw_written,
phy->fw_blob_data + phy->fw_written,
phy->fw_blob_size - phy->fw_written);
if (r < 0)
return r;
phy->fw_written += r;
phy->fw_work_state = FW_WORK_STATE_WAIT_WRITE_ANSWER;
return 0;
}
static int pn544_hci_i2c_fw_secure_write_frame_cmd(struct pn544_i2c_phy *phy,
const u8 *data, u16 datalen)
{
u8 buf[PN544_FW_I2C_MAX_PAYLOAD];
struct pn544_i2c_fw_secure_frame *chunk;
int chunklen;
int r;
if (datalen > PN544_FW_SECURE_CHUNK_WRITE_DATA_MAX_LEN)
datalen = PN544_FW_SECURE_CHUNK_WRITE_DATA_MAX_LEN;
chunk = (struct pn544_i2c_fw_secure_frame *) buf;
chunk->cmd = PN544_FW_CMD_SECURE_CHUNK_WRITE;
put_unaligned_be16(datalen, &chunk->be_datalen);
memcpy(chunk->data, data, datalen);
chunklen = sizeof(chunk->cmd) + sizeof(chunk->be_datalen) + datalen;
r = i2c_master_send(phy->i2c_dev, buf, chunklen);
if (r == chunklen)
return datalen;
else if (r < 0)
return r;
else
return -EIO;
}
static int pn544_hci_i2c_fw_secure_write_frame(struct pn544_i2c_phy *phy)
{
struct pn544_i2c_fw_secure_frame *framep;
int r;
framep = (struct pn544_i2c_fw_secure_frame *) phy->fw_blob_data;
if (phy->fw_written == 0)
phy->fw_blob_size = get_unaligned_be16(&framep->be_datalen)
+ PN544_FW_SECURE_FRAME_HEADER_LEN;
/* Only secure write command can be chunked*/
if (phy->fw_blob_size > PN544_FW_I2C_MAX_PAYLOAD &&
framep->cmd != PN544_FW_CMD_SECURE_WRITE)
return -EINVAL;
/* The firmware also have other commands, we just send them directly */
if (phy->fw_blob_size < PN544_FW_I2C_MAX_PAYLOAD) {
r = i2c_master_send(phy->i2c_dev,
(const char *) phy->fw_blob_data, phy->fw_blob_size);
if (r == phy->fw_blob_size)
goto exit;
else if (r < 0)
return r;
else
return -EIO;
}
r = pn544_hci_i2c_fw_secure_write_frame_cmd(phy,
phy->fw_blob_data + phy->fw_written,
phy->fw_blob_size - phy->fw_written);
if (r < 0)
return r;
exit:
phy->fw_written += r;
phy->fw_work_state = FW_WORK_STATE_WAIT_SECURE_WRITE_ANSWER;
/* SW reset command will not trig any response from PN544 */
if (framep->cmd == PN544_FW_CMD_RESET) {
pn544_hci_i2c_enable_mode(phy, PN544_FW_MODE);
phy->fw_cmd_result = 0;
schedule_work(&phy->fw_work);
}
return 0;
}
static void pn544_hci_i2c_fw_work(struct work_struct *work)
{
struct pn544_i2c_phy *phy = container_of(work, struct pn544_i2c_phy,
fw_work);
int r;
struct pn544_i2c_fw_blob *blob;
struct pn544_i2c_fw_secure_blob *secure_blob;
switch (phy->fw_work_state) {
case FW_WORK_STATE_START:
pn544_hci_i2c_enable_mode(phy, PN544_FW_MODE);
r = request_firmware(&phy->fw, phy->firmware_name,
&phy->i2c_dev->dev);
if (r < 0)
goto exit_state_start;
phy->fw_written = 0;
switch (phy->hw_variant) {
case PN544_HW_VARIANT_C2:
blob = (struct pn544_i2c_fw_blob *) phy->fw->data;
phy->fw_blob_size = get_unaligned_be32(&blob->be_size);
phy->fw_blob_dest_addr = get_unaligned_be32(
&blob->be_destaddr);
phy->fw_blob_data = blob->data;
r = pn544_hci_i2c_fw_write_chunk(phy);
break;
case PN544_HW_VARIANT_C3:
secure_blob = (struct pn544_i2c_fw_secure_blob *)
phy->fw->data;
phy->fw_blob_data = secure_blob->data;
phy->fw_size = phy->fw->size;
r = pn544_hci_i2c_fw_secure_write_frame(phy);
break;
default:
r = -ENOTSUPP;
break;
}
exit_state_start:
if (r < 0)
pn544_hci_i2c_fw_work_complete(phy, r);
break;
case FW_WORK_STATE_WAIT_WRITE_ANSWER:
r = phy->fw_cmd_result;
if (r < 0)
goto exit_state_wait_write_answer;
if (phy->fw_written == phy->fw_blob_size) {
r = pn544_hci_i2c_fw_check_cmd(phy->i2c_dev,
phy->fw_blob_dest_addr,
phy->fw_blob_data,
phy->fw_blob_size);
if (r < 0)
goto exit_state_wait_write_answer;
phy->fw_work_state = FW_WORK_STATE_WAIT_CHECK_ANSWER;
break;
}
r = pn544_hci_i2c_fw_write_chunk(phy);
exit_state_wait_write_answer:
if (r < 0)
pn544_hci_i2c_fw_work_complete(phy, r);
break;
case FW_WORK_STATE_WAIT_CHECK_ANSWER:
r = phy->fw_cmd_result;
if (r < 0)
goto exit_state_wait_check_answer;
blob = (struct pn544_i2c_fw_blob *) (phy->fw_blob_data +
phy->fw_blob_size);
phy->fw_blob_size = get_unaligned_be32(&blob->be_size);
if (phy->fw_blob_size != 0) {
phy->fw_blob_dest_addr =
get_unaligned_be32(&blob->be_destaddr);
phy->fw_blob_data = blob->data;
phy->fw_written = 0;
r = pn544_hci_i2c_fw_write_chunk(phy);
}
exit_state_wait_check_answer:
if (r < 0 || phy->fw_blob_size == 0)
pn544_hci_i2c_fw_work_complete(phy, r);
break;
case FW_WORK_STATE_WAIT_SECURE_WRITE_ANSWER:
r = phy->fw_cmd_result;
if (r < 0)
goto exit_state_wait_secure_write_answer;
if (r == PN544_FW_CMD_RESULT_CHUNK_OK) {
r = pn544_hci_i2c_fw_secure_write_frame(phy);
goto exit_state_wait_secure_write_answer;
}
if (phy->fw_written == phy->fw_blob_size) {
secure_blob = (struct pn544_i2c_fw_secure_blob *)
(phy->fw_blob_data + phy->fw_blob_size);
phy->fw_size -= phy->fw_blob_size +
PN544_FW_SECURE_BLOB_HEADER_LEN;
if (phy->fw_size >= PN544_FW_SECURE_BLOB_HEADER_LEN
+ PN544_FW_SECURE_FRAME_HEADER_LEN) {
phy->fw_blob_data = secure_blob->data;
phy->fw_written = 0;
r = pn544_hci_i2c_fw_secure_write_frame(phy);
}
}
exit_state_wait_secure_write_answer:
if (r < 0 || phy->fw_size == 0)
pn544_hci_i2c_fw_work_complete(phy, r);
break;
default:
break;
}
}
static int pn544_hci_i2c_acpi_request_resources(struct i2c_client *client)
{
struct pn544_i2c_phy *phy = i2c_get_clientdata(client);
const struct acpi_device_id *id;
struct gpio_desc *gpiod_en, *gpiod_irq, *gpiod_fw;
struct device *dev;
int ret;
if (!client)
return -EINVAL;
dev = &client->dev;
/* Match the struct device against a given list of ACPI IDs */
id = acpi_match_device(dev->driver->acpi_match_table, dev);
if (!id)
return -ENODEV;
/* Get EN GPIO from ACPI */
gpiod_en = devm_gpiod_get_index(dev, PN544_GPIO_NAME_EN, 1);
if (IS_ERR(gpiod_en)) {
nfc_err(dev,
"Unable to get EN GPIO\n");
return -ENODEV;
}
phy->gpio_en = desc_to_gpio(gpiod_en);
/* Configuration EN GPIO */
ret = gpiod_direction_output(gpiod_en, 0);
if (ret) {
nfc_err(dev, "Fail EN pin direction\n");
return ret;
}
/* Get FW GPIO from ACPI */
gpiod_fw = devm_gpiod_get_index(dev, PN544_GPIO_NAME_FW, 2);
if (IS_ERR(gpiod_fw)) {
nfc_err(dev,
"Unable to get FW GPIO\n");
return -ENODEV;
}
phy->gpio_fw = desc_to_gpio(gpiod_fw);
/* Configuration FW GPIO */
ret = gpiod_direction_output(gpiod_fw, 0);
if (ret) {
nfc_err(dev, "Fail FW pin direction\n");
return ret;
}
/* Get IRQ GPIO */
gpiod_irq = devm_gpiod_get_index(dev, PN544_GPIO_NAME_IRQ, 0);
if (IS_ERR(gpiod_irq)) {
nfc_err(dev,
"Unable to get IRQ GPIO\n");
return -ENODEV;
}
phy->gpio_irq = desc_to_gpio(gpiod_irq);
/* Configure IRQ GPIO */
ret = gpiod_direction_input(gpiod_irq);
if (ret) {
nfc_err(dev, "Fail IRQ pin direction\n");
return ret;
}
/* Map the pin to an IRQ */
ret = gpiod_to_irq(gpiod_irq);
if (ret < 0) {
nfc_err(dev, "Fail pin IRQ mapping\n");
return ret;
}
nfc_info(dev, "GPIO resource, no:%d irq:%d\n",
desc_to_gpio(gpiod_irq), ret);
client->irq = ret;
return 0;
}
#ifdef CONFIG_OF
static int pn544_hci_i2c_of_request_resources(struct i2c_client *client)
{
struct pn544_i2c_phy *phy = i2c_get_clientdata(client);
struct device_node *pp;
int ret;
pp = client->dev.of_node;
if (!pp) {
ret = -ENODEV;
goto err_dt;
}
/* Obtention of EN GPIO from device tree */
ret = of_get_named_gpio(pp, "enable-gpios", 0);
if (ret < 0) {
if (ret != -EPROBE_DEFER)
nfc_err(&client->dev,
"Failed to get EN gpio, error: %d\n", ret);
goto err_dt;
}
phy->gpio_en = ret;
/* Configuration of EN GPIO */
ret = gpio_request(phy->gpio_en, PN544_GPIO_NAME_EN);
if (ret) {
nfc_err(&client->dev, "Fail EN pin\n");
goto err_dt;
}
ret = gpio_direction_output(phy->gpio_en, 0);
if (ret) {
nfc_err(&client->dev, "Fail EN pin direction\n");
goto err_gpio_en;
}
/* Obtention of FW GPIO from device tree */
ret = of_get_named_gpio(pp, "firmware-gpios", 0);
if (ret < 0) {
if (ret != -EPROBE_DEFER)
nfc_err(&client->dev,
"Failed to get FW gpio, error: %d\n", ret);
goto err_gpio_en;
}
phy->gpio_fw = ret;
/* Configuration of FW GPIO */
ret = gpio_request(phy->gpio_fw, PN544_GPIO_NAME_FW);
if (ret) {
nfc_err(&client->dev, "Fail FW pin\n");
goto err_gpio_en;
}
ret = gpio_direction_output(phy->gpio_fw, 0);
if (ret) {
nfc_err(&client->dev, "Fail FW pin direction\n");
goto err_gpio_fw;
}
/* IRQ */
ret = irq_of_parse_and_map(pp, 0);
if (ret < 0) {
nfc_err(&client->dev,
"Unable to get irq, error: %d\n", ret);
goto err_gpio_fw;
}
client->irq = ret;
return 0;
err_gpio_fw:
gpio_free(phy->gpio_fw);
err_gpio_en:
gpio_free(phy->gpio_en);
err_dt:
return ret;
}
#else
static int pn544_hci_i2c_of_request_resources(struct i2c_client *client)
{
return -ENODEV;
}
#endif
static int pn544_hci_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct pn544_i2c_phy *phy;
struct pn544_nfc_platform_data *pdata;
int r = 0;
dev_dbg(&client->dev, "%s\n", __func__);
dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
return -ENODEV;
}
phy = devm_kzalloc(&client->dev, sizeof(struct pn544_i2c_phy),
GFP_KERNEL);
if (!phy)
return -ENOMEM;
INIT_WORK(&phy->fw_work, pn544_hci_i2c_fw_work);
phy->fw_work_state = FW_WORK_STATE_IDLE;
phy->i2c_dev = client;
i2c_set_clientdata(client, phy);
pdata = client->dev.platform_data;
/* No platform data, using device tree. */
if (!pdata && client->dev.of_node) {
r = pn544_hci_i2c_of_request_resources(client);
if (r) {
nfc_err(&client->dev, "No DT data\n");
return r;
}
/* Using platform data. */
} else if (pdata) {
if (pdata->request_resources == NULL) {
nfc_err(&client->dev, "request_resources() missing\n");
return -EINVAL;
}
r = pdata->request_resources(client);
if (r) {
nfc_err(&client->dev,
"Cannot get platform resources\n");
return r;
}
phy->gpio_en = pdata->get_gpio(NFC_GPIO_ENABLE);
phy->gpio_fw = pdata->get_gpio(NFC_GPIO_FW_RESET);
phy->gpio_irq = pdata->get_gpio(NFC_GPIO_IRQ);
/* Using ACPI */
} else if (ACPI_HANDLE(&client->dev)) {
r = pn544_hci_i2c_acpi_request_resources(client);
if (r) {
nfc_err(&client->dev,
"Cannot get ACPI data\n");
return r;
}
} else {
nfc_err(&client->dev, "No platform data\n");
return -EINVAL;
}
pn544_hci_i2c_platform_init(phy);
r = request_threaded_irq(client->irq, NULL, pn544_hci_i2c_irq_thread_fn,
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
PN544_HCI_I2C_DRIVER_NAME, phy);
if (r < 0) {
nfc_err(&client->dev, "Unable to register IRQ handler\n");
goto err_rti;
}
r = pn544_hci_probe(phy, &i2c_phy_ops, LLC_SHDLC_NAME,
PN544_I2C_FRAME_HEADROOM, PN544_I2C_FRAME_TAILROOM,
PN544_HCI_I2C_LLC_MAX_PAYLOAD,
pn544_hci_i2c_fw_download, &phy->hdev);
if (r < 0)
goto err_hci;
return 0;
err_hci:
free_irq(client->irq, phy);
err_rti:
if (!pdata) {
gpio_free(phy->gpio_en);
gpio_free(phy->gpio_fw);
} else if (pdata->free_resources) {
pdata->free_resources();
}
return r;
}
static int pn544_hci_i2c_remove(struct i2c_client *client)
{
struct pn544_i2c_phy *phy = i2c_get_clientdata(client);
struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
dev_dbg(&client->dev, "%s\n", __func__);
cancel_work_sync(&phy->fw_work);
if (phy->fw_work_state != FW_WORK_STATE_IDLE)
pn544_hci_i2c_fw_work_complete(phy, -ENODEV);
pn544_hci_remove(phy->hdev);
if (phy->powered)
pn544_hci_i2c_disable(phy);
free_irq(client->irq, phy);
/* No platform data, GPIOs have been requested by this driver */
if (!pdata) {
gpio_free(phy->gpio_en);
gpio_free(phy->gpio_fw);
/* Using platform data */
} else if (pdata->free_resources) {
pdata->free_resources();
}
return 0;
}
static const struct of_device_id of_pn544_i2c_match[] = {
{ .compatible = "nxp,pn544-i2c", },
{},
};
MODULE_DEVICE_TABLE(of, of_pn544_i2c_match);
static struct i2c_driver pn544_hci_i2c_driver = {
.driver = {
.name = PN544_HCI_I2C_DRIVER_NAME,
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(of_pn544_i2c_match),
.acpi_match_table = ACPI_PTR(pn544_hci_i2c_acpi_match),
},
.probe = pn544_hci_i2c_probe,
.id_table = pn544_hci_i2c_id_table,
.remove = pn544_hci_i2c_remove,
};
module_i2c_driver(pn544_hci_i2c_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(DRIVER_DESC);
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