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kernel_samsung_a34x-permissive/drivers/misc/mediatek/nfc/st21nfc/st21nfc.c
Fede2782 6db4831e98
Import A346BXXU4BWK2 kernel source 
Android 14
2024-04-28 15:51:13 +02:00

1115 lines
30 KiB
C
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/*
* Copyright (C) 2016 ST Microelectronics S.A.
* Copyright (C) 2010 Stollmann E+V GmbH
* Copyright (C) 2010 Trusted Logic S.A.
*
* 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 "st21nfc.h"
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/version.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
/* Test for kernel version.
* 3.18 => use DMA for I2C, no support for standardized
* GPIO access in DTS.
* 4.4 => the opposite.
*/
#include <linux/version.h>
#if (KERNEL_VERSION(4, 4, 0) > LINUX_VERSION_CODE)
// Legacy implementation, also used on recent kernels for legacy platforms
// such as (6580 and 6735)
# define KRNMTKLEGACY_I2C 1
# define KRNMTKLEGACY_CLK 1
# define KRNMTKLEGACY_GPIO 1
#endif
// Kernel 4.9 on some platforms is using legacy drivers (kernel-4.9-lc)
// I2C: CONFIG_MACH_MT6735 / 6735M / 6753 / 6580 / 6755 use legacy driver
// CLOCK: 4.9 has right includes, no need for special handling.
// GPIO : same as I2C -- we use the same condition at the moment.
//#if (defined(CONFIG_MACH_MT6735) || defined(CONFIG_MACH_MT6735M) ||
// defined(CONFIG_MACH_MT6753) || defined(CONFIG_MACH_MT6580) ||
// defined(CONFIG_MACH_MT6755))
// test on I2C special define instead of listing the platforms
#ifdef CONFIG_MTK_I2C_EXTENSION
# define KRNMTKLEGACY_I2C 1
# define KRNMTKLEGACY_GPIO 1
#endif
/* Set NO_MTK_CLK_MANAGEMENT if using xtal integration */
#ifndef NO_MTK_CLK_MANAGEMENT
# ifdef KRNMTKLEGACY_CLK
# include <mt_clkbuf_ctl.h>
# else
# include <mtk-clkbuf-bridge.h>
# endif
#endif
#define MAX_BUFFER_SIZE 260
#define DRIVER_VERSION "2.2.0.1"
/* define the active state of the WAKEUP pin */
#define ST21_IRQ_ACTIVE_HIGH 1
#define ST21_IRQ_ACTIVE_LOW 0
#define I2C_ID_NAME "st21nfc"
#ifdef KRNMTKLEGACY_I2C
#include <linux/dma-mapping.h>
#define NFC_CLIENT_TIMING 400 /* I2C speed */
static char *I2CDMAWriteBuf; /*= NULL;*/ /* unnecessary initialise */
static unsigned int I2CDMAWriteBuf_pa; /* = NULL; */
static char *I2CDMAReadBuf; /*= NULL;*/ /* unnecessary initialise */
static unsigned int I2CDMAReadBuf_pa; /* = NULL; */
#endif /* KRNMTKLEGACY_I2C */
/* prototypes */
static irqreturn_t st21nfc_dev_irq_handler(int irq, void *dev_id);
/*
* The platform data member 'polarity_mode' defines
* how the wakeup pin is configured and handled.
* it can take the following values :
* IRQF_TRIGGER_RISING
* IRQF_TRIGGER_FALLING
* IRQF_TRIGGER_HIGH
* IRQF_TRIGGER_LOW
*/
struct st21nfc_platform {
struct mutex read_mutex;
struct i2c_client *client;
int irq_gpio;
int reset_gpio;
int ena_gpio;
int polarity_mode;
int active_polarity; /* either 0 (low-active) or 1 (high-active) */
};
/* NFC IRQ */
static u32 nfc_irq;
static bool irqIsAttached;
static bool device_open; /* Is device open? */
static bool enable_debug_log;
struct st21nfc_dev {
wait_queue_head_t read_wq;
struct miscdevice st21nfc_device;
bool irq_enabled;
struct st21nfc_platform platform_data;
spinlock_t irq_enabled_lock;
};
static int st21nfc_loc_set_polaritymode(struct st21nfc_dev *st21nfc_dev,
int mode)
{
struct i2c_client *client = st21nfc_dev->platform_data.client;
unsigned int irq_type;
int ret;
if (enable_debug_log)
pr_info("%s:%d mode %d", __FILE__, __LINE__, mode);
st21nfc_dev->platform_data.polarity_mode = mode;
/* setup irq_flags */
switch (mode) {
case IRQF_TRIGGER_RISING:
irq_type = IRQ_TYPE_EDGE_RISING;
st21nfc_dev->platform_data.active_polarity = 1;
break;
case IRQF_TRIGGER_FALLING:
irq_type = IRQ_TYPE_EDGE_FALLING;
st21nfc_dev->platform_data.active_polarity = 0;
break;
case IRQF_TRIGGER_HIGH:
irq_type = IRQ_TYPE_LEVEL_HIGH;
st21nfc_dev->platform_data.active_polarity = 1;
break;
case IRQF_TRIGGER_LOW:
irq_type = IRQ_TYPE_LEVEL_LOW;
st21nfc_dev->platform_data.active_polarity = 0;
break;
default:
irq_type = IRQF_TRIGGER_FALLING;
st21nfc_dev->platform_data.active_polarity = 0;
break;
}
if (irqIsAttached) {
free_irq(client->irq, st21nfc_dev);
irqIsAttached = false;
}
ret = irq_set_irq_type(client->irq, irq_type);
if (ret) {
pr_err("%s : set_irq_type failed!!!!!!!\n", __FILE__);
return -ENODEV;
}
/* request irq. the irq is set whenever the chip has data available
* for reading. it is cleared when all data has been read.
*/
if (enable_debug_log)
pr_debug("%s : requesting IRQ %d\n", __func__, client->irq);
st21nfc_dev->irq_enabled = true;
ret = request_irq(client->irq, st21nfc_dev_irq_handler,
st21nfc_dev->platform_data.polarity_mode,
client->name, st21nfc_dev);
if (!ret)
irqIsAttached = true;
if (enable_debug_log)
pr_info("%s:%d ret %d", __FILE__, __LINE__, ret);
return ret;
}
static void st21nfc_disable_irq(struct st21nfc_dev *st21nfc_dev)
{
unsigned long flags;
spin_lock_irqsave(&st21nfc_dev->irq_enabled_lock, flags);
if (st21nfc_dev->irq_enabled) {
disable_irq_nosync(st21nfc_dev->platform_data.client->irq);
st21nfc_dev->irq_enabled = false;
}
spin_unlock_irqrestore(&st21nfc_dev->irq_enabled_lock, flags);
}
static irqreturn_t st21nfc_dev_irq_handler(int irq, void *dev_id)
{
struct st21nfc_dev *st21nfc_dev = dev_id;
st21nfc_disable_irq(st21nfc_dev);
/* Wake up waiting readers */
wake_up(&st21nfc_dev->read_wq);
return IRQ_HANDLED;
}
static ssize_t st21nfc_dev_read(struct file *filp, char __user *buf,
size_t count, loff_t *offset)
{
struct timeval s1, s2, e;
long t;
struct st21nfc_dev *st21nfc_dev = container_of(
filp->private_data, struct st21nfc_dev, st21nfc_device);
char tmp[MAX_BUFFER_SIZE];
int ret, pinlev;
if (count > MAX_BUFFER_SIZE)
count = MAX_BUFFER_SIZE;
if (enable_debug_log)
pr_debug("%s : reading %zu bytes.\n", __func__, count);
pinlev = gpio_get_value(st21nfc_dev->platform_data.irq_gpio);
if (((pinlev > 0) &&
(st21nfc_dev->platform_data.active_polarity == 0)) ||
((pinlev == 0) &&
(st21nfc_dev->platform_data.active_polarity == 1))) {
pr_info("%s : read called but no IRQ.\n", __func__);
memset(tmp, 0x7E, count);
if (copy_to_user(buf, tmp, count)) {
pr_warn("%s : failed to copy to user space\n",
__func__);
return -EFAULT;
}
return count;
}
do_gettimeofday(&s1);
mutex_lock(&st21nfc_dev->platform_data.read_mutex);
do_gettimeofday(&s2);
/* Read data */
#ifdef KRNMTKLEGACY_I2C
st21nfc_dev->platform_data.client->addr =
(st21nfc_dev->platform_data.client->addr & I2C_MASK_FLAG);
st21nfc_dev->platform_data.client->ext_flag |= I2C_DMA_FLAG;
/* st21nfc_dev->platform_data.client->ext_flag |= I2C_DIRECTION_FLAG; */
/* st21nfc_dev->platform_data.client->ext_flag |= I2C_A_FILTER_MSG; */
st21nfc_dev->platform_data.client->timing = NFC_CLIENT_TIMING;
/* Read data */
ret = i2c_master_recv(st21nfc_dev->platform_data.client,
(unsigned char *)(uintptr_t)I2CDMAReadBuf_pa,
count);
#else
ret = i2c_master_recv(st21nfc_dev->platform_data.client, tmp, count);
#endif
mutex_unlock(&st21nfc_dev->platform_data.read_mutex);
do_gettimeofday(&e);
t = (e.tv_sec - s1.tv_sec) * USEC_PER_SEC;
t += (e.tv_usec - s1.tv_usec);
if (t >= 10000) {
pr_err("%s: took over 10ms (%ld usec)\n", __func__, t);
t = (e.tv_sec - s2.tv_sec) * USEC_PER_SEC;
t += (e.tv_usec - s2.tv_usec);
pr_err("%s: %ld usec spent in i2c_master_recv\n", __func__, t);
}
if (ret < 0) {
pr_err("%s: i2c_master_recv returned %d\n", __func__, ret);
return ret;
}
if (ret > count) {
pr_err("%s: received too many bytes from i2c (%d)\n", __func__,
ret);
return -EIO;
}
#ifdef KRNMTKLEGACY_I2C
if (copy_to_user(buf, I2CDMAReadBuf, ret)) {
#else
if (copy_to_user(buf, tmp, ret)) {
#endif
pr_warn("%s : failed to copy to user space\n", __func__);
return -EFAULT;
}
return ret;
}
static ssize_t st21nfc_dev_write(struct file *filp, const char __user *buf,
size_t count, loff_t *offset)
{
struct st21nfc_dev *st21nfc_dev;
#ifndef KRNMTKLEGACY_I2C
char tmp[MAX_BUFFER_SIZE];
#endif
int ret = count;
st21nfc_dev = container_of(filp->private_data, struct st21nfc_dev,
st21nfc_device);
if (enable_debug_log) {
pr_debug("%s: st21nfc_dev ptr %p\n", __func__, st21nfc_dev);
pr_debug("%s : writing %zu bytes.\n", __func__, count);
}
if (count > MAX_BUFFER_SIZE)
count = MAX_BUFFER_SIZE;
#ifdef KRNMTKLEGACY_I2C
if (copy_from_user(I2CDMAWriteBuf, buf, count)) {
#else
if (copy_from_user(tmp, buf, count)) {
#endif
pr_err("%s : failed to copy from user space\n", __func__);
return -EFAULT;
}
/* Write data */
#ifdef KRNMTKLEGACY_I2C
st21nfc_dev->platform_data.client->addr =
(st21nfc_dev->platform_data.client->addr & I2C_MASK_FLAG);
st21nfc_dev->platform_data.client->ext_flag |= I2C_DMA_FLAG;
/* st21nfc_dev->platform_data.client->ext_flag |= I2C_DIRECTION_FLAG; */
/* st21nfc_dev->platform_data.client->ext_flag |= I2C_A_FILTER_MSG; */
st21nfc_dev->platform_data.client->timing = NFC_CLIENT_TIMING;
ret = i2c_master_send(st21nfc_dev->platform_data.client,
(unsigned char *)(uintptr_t)I2CDMAWriteBuf_pa,
count);
#else
ret = i2c_master_send(st21nfc_dev->platform_data.client, tmp, count);
#endif
if (ret != count) {
pr_err("%s : i2c_master_send returned %d\n", __func__, ret);
ret = -EIO;
}
return ret;
}
static int st21nfc_dev_open(struct inode *inode, struct file *filp)
{
int ret = 0;
struct st21nfc_dev *st21nfc_dev = NULL;
if (enable_debug_log)
pr_info("%s:%d dev_open", __FILE__, __LINE__);
if (device_open) {
ret = -EBUSY;
pr_err("%s : device already opened ret= %d\n", __func__, ret);
} else {
device_open = true;
st21nfc_dev = container_of(filp->private_data,
struct st21nfc_dev, st21nfc_device);
if (enable_debug_log) {
pr_debug("%s : %d,%d ", __func__, imajor(inode),
iminor(inode));
pr_debug("%s: st21nfc_dev ptr %p\n", __func__,
st21nfc_dev);
}
}
#ifndef NO_MTK_CLK_MANAGEMENT
/*If use XTAL mode, please remove this function "clk_buf_ctrl" to
*avoid additional power consumption.
*/
clk_buf_ctrl(CLK_BUF_NFC, true);
#endif
return ret;
}
static int st21nfc_release(struct inode *inode, struct file *file)
{
#ifndef NO_MTK_CLK_MANAGEMENT
/*If use XTAL mode, please remove this function "clk_buf_ctrl" to
*avoid additional power consumption.
*/
clk_buf_ctrl(CLK_BUF_NFC, false);
#endif
device_open = false;
if (enable_debug_log)
pr_debug("%s : device_open = %d\n", __func__, device_open);
return 0;
}
static void (*st21nfc_st54spi_cb)(int, void *);
static void *st21nfc_st54spi_data;
void st21nfc_register_st54spi_cb(void (*cb)(int, void *), void *data)
{
pr_info("%s\n", __func__);
st21nfc_st54spi_cb = cb;
st21nfc_st54spi_data = data;
}
void st21nfc_unregister_st54spi_cb(void)
{
pr_info("%s\n", __func__);
st21nfc_st54spi_cb = NULL;
st21nfc_st54spi_data = NULL;
}
static long st21nfc_dev_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
struct st21nfc_dev *st21nfc_dev = container_of(
filp->private_data, struct st21nfc_dev, st21nfc_device);
int ret = 0;
u32 tmp;
/* Check type and command number */
if (_IOC_TYPE(cmd) != ST21NFC_MAGIC)
return -ENOTTY;
/* Check access direction once here; don't repeat below.
* IOC_DIR is from the user perspective, while access_ok is
* from the kernel perspective; so they look reversed.
*/
if (_IOC_DIR(cmd) & _IOC_READ)
ret = !access_ok(VERIFY_WRITE,
(void __user *)arg, _IOC_SIZE(cmd));
if (ret == 0 && _IOC_DIR(cmd) & _IOC_WRITE)
ret = !access_ok(VERIFY_READ,
(void __user *)arg, _IOC_SIZE(cmd));
if (ret)
return -EFAULT;
switch (cmd) {
case ST21NFC_SET_POLARITY_FALLING:
case ST21NFC_LEGACY_SET_POLARITY_FALLING:
pr_info(" ### ST21NFC_SET_POLARITY_FALLING ###\n");
st21nfc_loc_set_polaritymode(st21nfc_dev, IRQF_TRIGGER_FALLING);
break;
case ST21NFC_SET_POLARITY_RISING:
case ST21NFC_LEGACY_SET_POLARITY_RISING:
pr_info(" ### ST21NFC_SET_POLARITY_RISING ###\n");
st21nfc_loc_set_polaritymode(st21nfc_dev, IRQF_TRIGGER_RISING);
break;
case ST21NFC_SET_POLARITY_LOW:
case ST21NFC_LEGACY_SET_POLARITY_LOW:
pr_info(" ### ST21NFC_SET_POLARITY_LOW ###\n");
st21nfc_loc_set_polaritymode(st21nfc_dev, IRQF_TRIGGER_LOW);
break;
case ST21NFC_SET_POLARITY_HIGH:
case ST21NFC_LEGACY_SET_POLARITY_HIGH:
pr_info(" ### ST21NFC_SET_POLARITY_HIGH ###\n");
st21nfc_loc_set_polaritymode(st21nfc_dev, IRQF_TRIGGER_HIGH);
break;
case ST21NFC_PULSE_RESET:
case ST21NFC_LEGACY_PULSE_RESET:
pr_info("%s Double Pulse Request\n", __func__);
if (st21nfc_dev->platform_data.reset_gpio != 0) {
if (st21nfc_st54spi_cb != 0)
(*st21nfc_st54spi_cb)(ST54SPI_CB_RESET_START,
st21nfc_st54spi_data);
/* pulse low for 20 millisecs */
pr_info("Pulse Request gpio is %d\n",
st21nfc_dev->platform_data.reset_gpio);
gpio_set_value(st21nfc_dev->platform_data.reset_gpio,
0);
msleep(20);
gpio_set_value(st21nfc_dev->platform_data.reset_gpio,
1);
msleep(20);
/* pulse low for 20 millisecs */
gpio_set_value(st21nfc_dev->platform_data.reset_gpio,
0);
msleep(20);
gpio_set_value(st21nfc_dev->platform_data.reset_gpio,
1);
pr_info("%s done Double Pulse Request\n", __func__);
if (st21nfc_st54spi_cb != 0)
(*st21nfc_st54spi_cb)(ST54SPI_CB_RESET_END,
st21nfc_st54spi_data);
}
break;
case ST21NFC_GET_WAKEUP:
case ST21NFC_LEGACY_GET_WAKEUP:
/* deliver state of Wake_up_pin as return value of ioctl */
ret = gpio_get_value(st21nfc_dev->platform_data.irq_gpio);
/*
* ret shall be equal to 1 if gpio level equals to polarity.
* Warning: depending on gpio_get_value implementation,
* it can returns a value different than 1 in case of high level
*/
if (((ret == 0) &&
(st21nfc_dev->platform_data.active_polarity == 0)) ||
((ret > 0) &&
(st21nfc_dev->platform_data.active_polarity == 1))) {
ret = 1;
} else {
ret = 0;
}
break;
case ST21NFC_GET_POLARITY:
case ST21NFC_LEGACY_GET_POLARITY:
ret = st21nfc_dev->platform_data.polarity_mode;
if (enable_debug_log)
pr_debug("%s get polarity %d\n", __func__, ret);
break;
case ST21NFC_RECOVERY:
case ST21NFC_LEGACY_RECOVERY:
/* For ST21NFCD usage only */
pr_info("%s Recovery Request\n", __func__);
if (st21nfc_dev->platform_data.reset_gpio != 0) {
if (irqIsAttached) {
struct i2c_client *client =
st21nfc_dev->platform_data.client;
free_irq(client->irq, st21nfc_dev);
irqIsAttached = false;
}
gpio_set_value(st21nfc_dev->platform_data.reset_gpio,
0);
msleep(20);
gpio_set_value(st21nfc_dev->platform_data.reset_gpio,
1);
msleep(20);
/* pulse low for 20 millisecs */
gpio_set_value(st21nfc_dev->platform_data.reset_gpio,
0);
msleep(20);
/* during the reset, force IRQ OUT as PU output instead
* of input in normal usage
*/
ret = gpio_direction_output(
st21nfc_dev->platform_data.irq_gpio, 1);
if (ret) {
pr_err("%s : gpio_direction_output failed\n",
__func__);
ret = -ENODEV;
break;
}
gpio_set_value(st21nfc_dev->platform_data.irq_gpio, 1);
msleep(20);
gpio_set_value(st21nfc_dev->platform_data.reset_gpio,
1);
pr_info("%s done double Pulse Request\n", __func__);
}
msleep(20);
gpio_set_value(st21nfc_dev->platform_data.irq_gpio, 0);
msleep(20);
gpio_set_value(st21nfc_dev->platform_data.irq_gpio, 1);
msleep(20);
gpio_set_value(st21nfc_dev->platform_data.irq_gpio, 0);
msleep(20);
pr_info("%s Recovery procedure finished\n", __func__);
ret = gpio_direction_input(st21nfc_dev->platform_data.irq_gpio);
if (ret) {
pr_err("%s : gpio_direction_input failed\n", __func__);
ret = -ENODEV;
}
break;
case ST21NFC_USE_ESE:
ret = __get_user(tmp, (u32 __user *)arg);
if (ret == 0) {
if (st21nfc_st54spi_cb != 0)
(*st21nfc_st54spi_cb)(tmp ? ST54SPI_CB_ESE_USED
: ST54SPI_CB_ESE_NOT_USED,
st21nfc_st54spi_data);
}
if (enable_debug_log)
pr_debug("%s use ESE %d : %d\n", __func__, ret, tmp);
break;
default:
pr_err("%s bad ioctl %u\n", __func__, cmd);
ret = -EINVAL;
break;
}
return ret;
}
static unsigned int st21nfc_poll(struct file *file, poll_table *wait)
{
struct st21nfc_dev *st21nfc_dev = container_of(
file->private_data, struct st21nfc_dev, st21nfc_device);
unsigned int mask = 0;
int pinlev = 0;
/* wait for Wake_up_pin == high */
poll_wait(file, &st21nfc_dev->read_wq, wait);
pinlev = gpio_get_value(st21nfc_dev->platform_data.irq_gpio);
if (((pinlev == 0) &&
(st21nfc_dev->platform_data.active_polarity == 0)) ||
((pinlev > 0) &&
(st21nfc_dev->platform_data.active_polarity == 1))) {
mask = POLLIN | POLLRDNORM; /* signal data avail */
st21nfc_disable_irq(st21nfc_dev);
} else {
/* Wake_up_pin is low. Activate ISR */
if (!st21nfc_dev->irq_enabled) {
if (enable_debug_log)
pr_debug("%s enable irq\n", __func__);
st21nfc_dev->irq_enabled = true;
enable_irq(st21nfc_dev->platform_data.client->irq);
} else {
if (enable_debug_log)
pr_debug("%s irq already enabled\n", __func__);
}
}
return mask;
}
#ifndef KRNMTKLEGACY_GPIO
static int st21nfc_platform_probe(struct platform_device *pdev)
{
if (enable_debug_log)
pr_debug("%s\n", __func__);
return 0;
}
static int st21nfc_platform_remove(struct platform_device *pdev)
{
if (enable_debug_log)
pr_debug("%s\n", __func__);
return 0;
}
#endif /* KRNMTKLEGACY_GPIO */
static const struct file_operations st21nfc_dev_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.read = st21nfc_dev_read,
.write = st21nfc_dev_write,
.open = st21nfc_dev_open,
.poll = st21nfc_poll,
.release = st21nfc_release,
.unlocked_ioctl = st21nfc_dev_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = st21nfc_dev_ioctl
#endif
};
static ssize_t i2c_addr_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
if (client != NULL)
return sprintf(buf, "0x%.2x\n", client->addr);
return 0;
} /* i2c_addr_show() */
static ssize_t i2c_addr_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct st21nfc_dev *data = dev_get_drvdata(dev);
long new_addr = 0;
if (data != NULL && data->platform_data.client != NULL) {
if (!kstrtol(buf, 10, &new_addr)) {
mutex_lock(&data->platform_data.read_mutex);
data->platform_data.client->addr = new_addr;
mutex_unlock(&data->platform_data.read_mutex);
return count;
}
return -EINVAL;
}
return 0;
} /* i2c_addr_store() */
static ssize_t version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%s\n", DRIVER_VERSION);
} /* version_show */
static DEVICE_ATTR_RW(i2c_addr);
static DEVICE_ATTR_RO(version);
static struct attribute *st21nfc_attrs[] = {
&dev_attr_i2c_addr.attr, &dev_attr_version.attr, NULL,
};
static struct attribute_group st21nfc_attr_grp = {
.attrs = st21nfc_attrs,
};
#ifdef CONFIG_OF
static int nfc_parse_dt(struct device *dev, struct st21nfc_platform_data *pdata)
{
int r = 0;
struct device_node *np = dev->of_node;
np = of_find_compatible_node(NULL, NULL, "mediatek,nfc-gpio-v2");
if (np) {
#if (!defined(CONFIG_MTK_GPIO) || defined(CONFIG_MTK_GPIOLIB_STAND))
r = of_get_named_gpio(np, "gpio-rst-std", 0);
if (r < 0)
pr_err("%s: get NFC RST GPIO failed (%d)", __FILE__, r);
else
pdata->reset_gpio = r;
r = of_get_named_gpio(np, "gpio-irq-std", 0);
if (r < 0)
pr_err("%s: get NFC IRQ GPIO failed (%d)", __FILE__, r);
else
pdata->irq_gpio = r;
r = 0;
#else
of_property_read_u32_array(np, "gpio-rst", &(pdata->reset_gpio),
1);
of_property_read_u32_array(np, "gpio-irq", &(pdata->irq_gpio),
1);
#endif
} else {
if (enable_debug_log)
pr_debug("%s : get gpio num err.\n", __func__);
return -1;
}
pdata->polarity_mode = 0;
pr_info("[dsc]%s : get reset_gpio[%d], irq_gpio[%d], polarity_mode[%d]\n",
__func__, pdata->reset_gpio, pdata->irq_gpio,
pdata->polarity_mode);
return r;
}
#else
static int nfc_parse_dt(struct device *dev, struct st21nfc_platform_data *pdata)
{
return 0;
}
#endif
static int st21nfc_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret;
struct st21nfc_platform_data *platform_data;
struct st21nfc_dev *st21nfc_dev;
struct device_node *node;
struct gpio_desc *desc;
#ifdef KRNMTKLEGACY_I2C
#ifdef CONFIG_64BIT
I2CDMAWriteBuf = (char *)dma_alloc_coherent(
&client->dev, MAX_BUFFER_SIZE, (dma_addr_t *)&I2CDMAWriteBuf_pa,
GFP_KERNEL);
#else
I2CDMAWriteBuf = (char *)dma_alloc_coherent(
NULL, MAX_BUFFER_SIZE, (dma_addr_t *)&I2CDMAWriteBuf_pa,
GFP_KERNEL);
#endif
if (I2CDMAWriteBuf == NULL)
pr_err("%s : failed to allocate dma buffer\n", __func__);
#ifdef CONFIG_64BIT
I2CDMAReadBuf = (char *)dma_alloc_coherent(
&client->dev, MAX_BUFFER_SIZE, (dma_addr_t *)&I2CDMAReadBuf_pa,
GFP_KERNEL);
#else
I2CDMAReadBuf = (char *)dma_alloc_coherent(
NULL, MAX_BUFFER_SIZE, (dma_addr_t *)&I2CDMAReadBuf_pa,
GFP_KERNEL);
#endif
if (I2CDMAReadBuf == NULL)
pr_err("%s : failed to allocate dma buffer\n", __func__);
pr_debug("%s :I2CDMAWriteBuf_pa %d, I2CDMAReadBuf_pa,%d\n", __func__,
I2CDMAWriteBuf_pa, I2CDMAReadBuf_pa);
#endif /* KRNMTKLEGACY_I2C */
if (client->dev.of_node) {
platform_data = devm_kzalloc(
&client->dev, sizeof(struct st21nfc_platform_data),
GFP_KERNEL);
if (!platform_data)
return -ENOMEM;
pr_info("%s : Parse st21nfc DTS\n", __func__);
ret = nfc_parse_dt(&client->dev, platform_data);
if (ret) {
pr_err("%s : ret =%d\n", __func__, ret);
return ret;
}
pr_info("%s : Parsed st21nfc DTS %d %d\n", __func__,
platform_data->reset_gpio, platform_data->irq_gpio);
} else {
platform_data = client->dev.platform_data;
pr_err("%s : No st21nfc DTS\n", __func__);
}
if (!platform_data)
return -EINVAL;
dev_dbg(&client->dev, "nfc-nci probe: %s, inside nfc-nci flags = %x\n",
__func__, client->flags);
if (platform_data == NULL) {
dev_err(&client->dev, "nfc-nci probe: failed\n");
return -ENODEV;
}
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
pr_err("%s : need I2C_FUNC_I2C\n", __func__);
return -ENODEV;
}
pr_info("%s : after i2c_check_functionality %d %d\n", __func__,
platform_data->reset_gpio, platform_data->irq_gpio);
st21nfc_dev = kzalloc(sizeof(*st21nfc_dev), GFP_KERNEL);
if (st21nfc_dev == NULL) {
ret = -ENOMEM;
goto err_exit;
}
if (enable_debug_log)
pr_debug("%s : dev_cb_addr %p\n", __func__, st21nfc_dev);
pr_info("%s : dev_cb_addr %p\n", __func__, st21nfc_dev);
/* store for later use */
st21nfc_dev->platform_data.irq_gpio = platform_data->irq_gpio;
st21nfc_dev->platform_data.ena_gpio = platform_data->ena_gpio;
st21nfc_dev->platform_data.reset_gpio = platform_data->reset_gpio;
st21nfc_dev->platform_data.polarity_mode = platform_data->polarity_mode;
st21nfc_dev->platform_data.client = client;
if (enable_debug_log) {
pr_debug("%s gpio_request, ret is %d %d %d %d // %d %d %d %d\n",
__func__, st21nfc_dev->platform_data.irq_gpio,
st21nfc_dev->platform_data.ena_gpio,
st21nfc_dev->platform_data.reset_gpio,
st21nfc_dev->platform_data.polarity_mode,
platform_data->irq_gpio, platform_data->ena_gpio,
platform_data->reset_gpio,
platform_data->polarity_mode);
desc = gpio_to_desc(platform_data->irq_gpio);
if (!desc)
pr_debug("gpio_desc is null\n");
else
pr_debug("gpio_desc isn't null\n");
if (gpio_is_valid(platform_data->irq_gpio))
pr_debug("gpio number %d is valid\n",
platform_data->irq_gpio);
if (gpio_is_valid(platform_data->reset_gpio))
pr_debug("gpio number %d is valid\n",
platform_data->reset_gpio);
}
ret = gpio_request(platform_data->irq_gpio,
#if (!defined(CONFIG_MTK_GPIO) || defined(CONFIG_MTK_GPIOLIB_STAND))
"gpio-irq-std"
#else
"gpio-irq"
#endif
);
if (ret) {
pr_err("%s : gpio_request failed\n", __FILE__);
goto err_free_buffer;
}
pr_info("%s : IRQ GPIO = %d\n", __func__, platform_data->irq_gpio);
ret = gpio_direction_input(platform_data->irq_gpio);
if (ret) {
pr_err("%s : gpio_direction_input failed\n", __FILE__);
ret = -ENODEV;
goto err_free_buffer;
}
st21nfc_dev->platform_data.client->irq = platform_data->irq_gpio;
/* initialize irqIsAttached variable */
irqIsAttached = false;
/* initialize device_open variable */
device_open = 0;
/* handle optional RESET */
if (platform_data->reset_gpio != 0) {
ret = gpio_request(platform_data->reset_gpio,
#if (!defined(CONFIG_MTK_GPIO) || defined(CONFIG_MTK_GPIOLIB_STAND))
"gpio-rst-std"
#else
"gpio-rst"
#endif
);
if (ret) {
pr_err("%s : reset gpio_request failed\n", __FILE__);
ret = -ENODEV;
goto err_free_buffer;
}
pr_info("%s : RST GPIO = %d\n", __func__,
platform_data->reset_gpio);
ret = gpio_direction_output(platform_data->reset_gpio, 1);
if (ret) {
pr_err("%s : reset gpio_direction_output failed\n",
__FILE__);
ret = -ENODEV;
goto err_free_buffer;
}
/* low active */
gpio_set_value(st21nfc_dev->platform_data.reset_gpio, 1);
}
/* set up optional ENA gpio */
if (platform_data->ena_gpio != 0) {
ret = gpio_request(platform_data->ena_gpio, "st21nfc_ena");
if (ret) {
pr_err("%s : ena gpio_request failed\n", __FILE__);
ret = -ENODEV;
goto err_free_buffer;
}
ret = gpio_direction_output(platform_data->ena_gpio, 1);
if (ret) {
pr_err("%s : ena gpio_direction_output failed\n",
__FILE__);
ret = -ENODEV;
goto err_free_buffer;
}
}
node = of_find_compatible_node(NULL, NULL, "mediatek,irq_nfc-eint");
if (node) {
nfc_irq = irq_of_parse_and_map(node, 0);
client->irq = nfc_irq;
pr_info("%s : MT IRQ GPIO = %d\n", __func__, client->irq);
enable_irq_wake(client->irq);
} else {
pr_err("%s : can not find NFC eint compatible node\n",
__func__);
}
/* init mutex and queues */
init_waitqueue_head(&st21nfc_dev->read_wq);
mutex_init(&st21nfc_dev->platform_data.read_mutex);
spin_lock_init(&st21nfc_dev->irq_enabled_lock);
st21nfc_dev->st21nfc_device.minor = MISC_DYNAMIC_MINOR;
st21nfc_dev->st21nfc_device.name = I2C_ID_NAME;
st21nfc_dev->st21nfc_device.fops = &st21nfc_dev_fops;
st21nfc_dev->st21nfc_device.parent = &client->dev;
i2c_set_clientdata(client, st21nfc_dev);
ret = misc_register(&st21nfc_dev->st21nfc_device);
if (ret) {
pr_info("ret of misc_register:%d\n", ret);
pr_err("%s : misc_register failed\n", __FILE__);
goto err_misc_register;
}
if (sysfs_create_group(&client->dev.kobj, &st21nfc_attr_grp)) {
pr_err("%s : sysfs_create_group failed\n", __FILE__);
goto err_request_irq_failed;
}
st21nfc_disable_irq(st21nfc_dev);
return 0;
err_request_irq_failed:
misc_deregister(&st21nfc_dev->st21nfc_device);
err_misc_register:
mutex_destroy(&st21nfc_dev->platform_data.read_mutex);
err_free_buffer:
kfree(st21nfc_dev);
err_exit:
gpio_free(platform_data->irq_gpio);
if (platform_data->ena_gpio != 0)
gpio_free(platform_data->ena_gpio);
return ret;
}
static int st21nfc_remove(struct i2c_client *client)
{
struct st21nfc_dev *st21nfc_dev;
#ifdef KRNMTKLEGACY_I2C
if (I2CDMAWriteBuf) {
#ifdef CONFIG_64BIT
dma_free_coherent(&client->dev, MAX_BUFFER_SIZE, I2CDMAWriteBuf,
I2CDMAWriteBuf_pa);
#else
dma_free_coherent(NULL, MAX_BUFFER_SIZE, I2CDMAWriteBuf,
I2CDMAWriteBuf_pa);
#endif
I2CDMAWriteBuf = NULL;
I2CDMAWriteBuf_pa = 0;
}
if (I2CDMAReadBuf) {
#ifdef CONFIG_64BIT
dma_free_coherent(&client->dev, MAX_BUFFER_SIZE, I2CDMAReadBuf,
I2CDMAReadBuf_pa);
#else
dma_free_coherent(NULL, MAX_BUFFER_SIZE, I2CDMAReadBuf,
I2CDMAReadBuf_pa);
#endif
I2CDMAReadBuf = NULL;
I2CDMAReadBuf_pa = 0;
}
#endif /* KRNMTKLEGACY_I2C */
st21nfc_dev = i2c_get_clientdata(client);
free_irq(client->irq, st21nfc_dev);
misc_deregister(&st21nfc_dev->st21nfc_device);
mutex_destroy(&st21nfc_dev->platform_data.read_mutex);
gpio_free(st21nfc_dev->platform_data.irq_gpio);
if (st21nfc_dev->platform_data.ena_gpio != 0)
gpio_free(st21nfc_dev->platform_data.ena_gpio);
kfree(st21nfc_dev);
return 0;
}
static const struct i2c_device_id st21nfc_id[] = {{"st21nfc", 0}, {} };
#ifdef CONFIG_OF
static const struct of_device_id nfc_switch_of_match[] = {
{.compatible = "mediatek,nfc"}, {},
};
#endif
static struct i2c_driver st21nfc_driver = {
.id_table = st21nfc_id,
.probe = st21nfc_probe,
.remove = st21nfc_remove,
.driver = {
.owner = THIS_MODULE,
.name = I2C_ID_NAME,
#ifdef CONFIG_OF
.of_match_table = nfc_switch_of_match,
#endif
},
};
#ifndef KRNMTKLEGACY_GPIO
/* platform driver */
static const struct of_device_id nfc_dev_of_match[] = {
{
.compatible = "mediatek,nfc-gpio-v2",
},
{},
};
static struct platform_driver st21nfc_platform_driver = {
.probe = st21nfc_platform_probe,
.remove = st21nfc_platform_remove,
.driver = {
.name = I2C_ID_NAME,
.owner = THIS_MODULE,
#ifdef CONFIG_OF
.of_match_table = nfc_dev_of_match,
#endif
},
};
#endif /* KRNMTKLEGACY_GPIO */
/* module load/unload record keeping */
static int __init st21nfc_dev_init(void)
{
pr_info("Loading st21nfc driver\n");
#ifndef KRNMTKLEGACY_GPIO
platform_driver_register(&st21nfc_platform_driver);
if (enable_debug_log)
pr_debug("Loading st21nfc i2c driver\n");
#endif
return i2c_add_driver(&st21nfc_driver);
}
module_init(st21nfc_dev_init);
static void __exit st21nfc_dev_exit(void)
{
pr_info("Unloading st21nfc driver\n");
i2c_del_driver(&st21nfc_driver);
}
module_exit(st21nfc_dev_exit);
MODULE_AUTHOR("Norbert Kawulski");
MODULE_DESCRIPTION("NFC ST21NFC driver");
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL");
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