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lineage_kernel_xcoverpro/drivers/nfc/sec_nfc.c

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/*
* SAMSUNG NFC Controller
*
* Copyright (C) 2013 Samsung Electronics Co.Ltd
* Author: Woonki Lee <woonki84.lee@samsung.com>
* Heejae Kim <heejae12.kim@samsung.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* 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;
*
*/
#define pr_fmt(fmt) "[sec_nfc] %s: " fmt, __func__
#include <linux/wait.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/clk-provider.h>
#include <linux/interrupt.h>
#include <linux/wakelock.h>
#include <linux/of_gpio.h>
#include <linux/clk.h>
#include <linux/regulator/consumer.h>
#include <linux/interrupt.h>
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/i2c.h>
#ifdef CONFIG_ESE_SECURE
#include <linux/smc.h>
#endif
#include "sec_nfc.h"
#include "./nfc_logger/nfc_logger.h"
#define SEC_NFC_GET_INFO(dev) i2c_get_clientdata(to_i2c_client(dev))
enum sec_nfc_irq {
SEC_NFC_SKIP = -1,
SEC_NFC_NONE,
SEC_NFC_INT,
SEC_NFC_READ_TIMES,
};
struct sec_nfc_i2c_info {
struct i2c_client *i2c_dev;
struct mutex read_mutex;
enum sec_nfc_irq read_irq;
wait_queue_head_t read_wait;
size_t buflen;
u8 *buf;
};
struct sec_nfc_info {
struct miscdevice miscdev;
struct mutex mutex;
enum sec_nfc_mode mode;
struct device *dev;
struct sec_nfc_platform_data *pdata;
struct sec_nfc_i2c_info i2c_info;
struct wake_lock nfc_wake_lock;
struct wake_lock nfc_clk_wake_lock;
bool clk_ctl;
bool clk_state;
struct platform_device *pdev;
};
#define FEATURE_SEC_NFC_TEST
#ifdef FEATURE_SEC_NFC_TEST
static struct sec_nfc_info *g_nfc_info;
static bool on_nfc_test;
static bool nfc_int_wait;
#endif
static irqreturn_t sec_nfc_irq_thread_fn(int irq, void *dev_id)
{
struct sec_nfc_info *info = dev_id;
struct sec_nfc_platform_data *pdata = info->pdata;
NFC_LOG_REC("irq\n");
#ifdef FEATURE_SEC_NFC_TEST
if (on_nfc_test) {
nfc_int_wait = true;
NFC_LOG_INFO("NFC_TEST: interrupt is raised\n");
wake_up_interruptible(&info->i2c_info.read_wait);
return IRQ_HANDLED;
}
#endif
if (gpio_get_value(pdata->irq) == 0) {
NFC_LOG_REC("irq-gpio state is low!\n");
return IRQ_HANDLED;
}
mutex_lock(&info->i2c_info.read_mutex);
/* Skip interrupt during power switching
* It is released after first write
*/
if (info->i2c_info.read_irq == SEC_NFC_SKIP) {
NFC_LOG_REC("Now power swiching. Skip this IRQ\n");
mutex_unlock(&info->i2c_info.read_mutex);
return IRQ_HANDLED;
}
info->i2c_info.read_irq += SEC_NFC_READ_TIMES;
mutex_unlock(&info->i2c_info.read_mutex);
wake_up_interruptible(&info->i2c_info.read_wait);
wake_lock_timeout(&info->nfc_wake_lock, 2*HZ);
return IRQ_HANDLED;
}
static int nfc_state_print(struct sec_nfc_info *info)
{
struct sec_nfc_platform_data *pdata = info->pdata;
struct regulator *regulator_nfc_pvdd;
int en = gpio_get_value(info->pdata->ven);
int firm = gpio_get_value(info->pdata->firm);
int irq = gpio_get_value(info->pdata->irq);
int pvdd = 0;
if (gpio_is_valid(pdata->pvdd_en))
pvdd = gpio_get_value(pdata->pvdd_en);
else {
regulator_nfc_pvdd = regulator_get(NULL, pdata->nfc_pvdd);
if (IS_ERR(regulator_nfc_pvdd) || regulator_nfc_pvdd == NULL) {
NFC_LOG_ERR("%s - nfc_pvdd regulator_get fail\n", __func__);
return -ENODEV;
}
pvdd = regulator_is_enabled(regulator_nfc_pvdd);
regulator_put(regulator_nfc_pvdd);
}
NFC_LOG_INFO("%s en: %d, firm: %d power: %d irq: %d\n", __func__, en, firm, pvdd, irq);
NFC_LOG_INFO("%s mode %d, clk_state: %d\n", __func__, info->mode, info->clk_state);
return 0;
}
static ssize_t sec_nfc_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
struct sec_nfc_info *info = container_of(file->private_data,
struct sec_nfc_info, miscdev);
enum sec_nfc_irq irq;
int ret = 0;
#ifdef FEATURE_SEC_NFC_TEST
if (on_nfc_test)
return 0;
#endif
mutex_lock(&info->mutex);
if (info->mode == SEC_NFC_MODE_OFF) {
NFC_LOG_ERR("read() nfc is not enabled\n");
ret = -ENODEV;
goto out;
}
mutex_lock(&info->i2c_info.read_mutex);
if (count == 0) {
if (info->i2c_info.read_irq >= SEC_NFC_INT)
info->i2c_info.read_irq--;
mutex_unlock(&info->i2c_info.read_mutex);
goto out;
}
irq = info->i2c_info.read_irq;
mutex_unlock(&info->i2c_info.read_mutex);
if (irq == SEC_NFC_NONE) {
if (file->f_flags & O_NONBLOCK) {
NFC_LOG_ERR("read() it is nonblock\n");
ret = -EAGAIN;
goto out;
}
}
/* i2c recv */
if (count > info->i2c_info.buflen)
count = info->i2c_info.buflen;
if (count > SEC_NFC_MSG_MAX_SIZE) {
NFC_LOG_ERR("read() user required wrong size :%d\n", (u32)count);
ret = -EINVAL;
goto out;
}
NFC_LOG_REC("read(%zu)\n", count);
mutex_lock(&info->i2c_info.read_mutex);
memset(info->i2c_info.buf, 0, count);
ret = i2c_master_recv(info->i2c_info.i2c_dev, info->i2c_info.buf, (u32)count);
if (ret == -EREMOTEIO) {
ret = -ERESTART;
goto read_error;
} else if (ret != count) {
NFC_LOG_ERR("read failed: return: %d count: %d\n",
ret, (u32)count);
/*ret = -EREMOTEIO;*/
goto read_error;
}
if (info->i2c_info.read_irq >= SEC_NFC_INT)
info->i2c_info.read_irq--;
if (info->i2c_info.read_irq == SEC_NFC_READ_TIMES)
wake_up_interruptible(&info->i2c_info.read_wait);
mutex_unlock(&info->i2c_info.read_mutex);
if (copy_to_user(buf, info->i2c_info.buf, ret)) {
NFC_LOG_ERR("read() copy failed to user\n");
ret = -EFAULT;
}
goto out;
read_error:
NFC_LOG_ERR("read error %d\n", ret);
nfc_state_print(info);
info->i2c_info.read_irq = SEC_NFC_NONE;
mutex_unlock(&info->i2c_info.read_mutex);
out:
mutex_unlock(&info->mutex);
return ret;
}
static ssize_t sec_nfc_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct sec_nfc_info *info = container_of(file->private_data,
struct sec_nfc_info, miscdev);
int ret = 0;
NFC_LOG_DBG("write() count %d\n", (u32)count);
#ifdef FEATURE_SEC_NFC_TEST
if (on_nfc_test)
return 0;
#endif
mutex_lock(&info->mutex);
if (info->mode == SEC_NFC_MODE_OFF) {
NFC_LOG_ERR("write() nfc is not enabled\n");
ret = -ENODEV;
goto out;
}
if (count > info->i2c_info.buflen)
count = info->i2c_info.buflen;
if (count > SEC_NFC_MSG_MAX_SIZE) {
NFC_LOG_ERR("write() user required wrong size :%d\n", (u32)count);
ret = -EINVAL;
goto out;
}
if (copy_from_user(info->i2c_info.buf, buf, count)) {
NFC_LOG_ERR("write() copy failed from user\n");
ret = -EFAULT;
goto out;
}
/* Skip interrupt during power switching
* It is released after first write
*/
NFC_LOG_REC("write(%d)\n", count);
mutex_lock(&info->i2c_info.read_mutex);
ret = i2c_master_send(info->i2c_info.i2c_dev, info->i2c_info.buf, count);
if (info->i2c_info.read_irq == SEC_NFC_SKIP)
info->i2c_info.read_irq = SEC_NFC_NONE;
mutex_unlock(&info->i2c_info.read_mutex);
if (ret == -EREMOTEIO) {
NFC_LOG_ERR("write failed: return: %d count: %d\n",
ret, (u32)count);
ret = -ERESTART;
goto write_error;
}
if (ret != count) {
NFC_LOG_ERR("write failed: return: %d count: %d\n",
ret, (u32)count);
ret = -EREMOTEIO;
goto write_error;
}
goto out;
write_error:
nfc_state_print(info);
out:
mutex_unlock(&info->mutex);
return ret;
}
static unsigned int sec_nfc_poll(struct file *file, poll_table *wait)
{
struct sec_nfc_info *info = container_of(file->private_data,
struct sec_nfc_info, miscdev);
enum sec_nfc_irq irq;
int ret = 0;
mutex_lock(&info->mutex);
if (info->mode == SEC_NFC_MODE_OFF) {
NFC_LOG_ERR("poll() nfc is not enabled\n");
ret = -ENODEV;
goto out;
}
poll_wait(file, &info->i2c_info.read_wait, wait);
mutex_lock(&info->i2c_info.read_mutex);
irq = info->i2c_info.read_irq;
if (irq == SEC_NFC_READ_TIMES)
ret = (POLLIN | POLLRDNORM);
mutex_unlock(&info->i2c_info.read_mutex);
out:
mutex_unlock(&info->mutex);
return ret;
}
static int sec_nfc_regulator_onoff(struct sec_nfc_platform_data *data, int onoff)
{
int rc = 0;
struct regulator *regulator_nfc_pvdd;
regulator_nfc_pvdd = regulator_get(NULL, data->nfc_pvdd);
if (IS_ERR(regulator_nfc_pvdd) || regulator_nfc_pvdd == NULL) {
NFC_LOG_ERR("nfc_pvdd regulator_get fail\n");
return -ENODEV;
}
NFC_LOG_INFO("regulator onoff = %d\n", onoff);
if (onoff == NFC_I2C_LDO_ON) {
rc = regulator_enable(regulator_nfc_pvdd);
if (rc) {
NFC_LOG_ERR("regulator enable nfc_pvdd failed, rc=%d\n", rc);
goto done;
}
} else {
rc = regulator_disable(regulator_nfc_pvdd);
if (rc) {
NFC_LOG_ERR("regulator disable nfc_pvdd failed, rc=%d\n", rc);
goto done;
}
}
done:
regulator_put(regulator_nfc_pvdd);
return rc;
}
void sec_nfc_i2c_irq_clear(struct sec_nfc_info *info)
{
/* clear interrupt. Interrupt will be occurred at power off */
mutex_lock(&info->i2c_info.read_mutex);
info->i2c_info.read_irq = SEC_NFC_NONE;
mutex_unlock(&info->i2c_info.read_mutex);
}
int sec_nfc_i2c_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct sec_nfc_info *info = dev_get_drvdata(dev);
struct sec_nfc_platform_data *pdata = info->pdata;
int ret;
NFC_LOG_INFO("probe() start\n");
info->i2c_info.buflen = SEC_NFC_MAX_BUFFER_SIZE;
info->i2c_info.buf = kzalloc(SEC_NFC_MAX_BUFFER_SIZE, GFP_KERNEL);
if (!info->i2c_info.buf) {
NFC_LOG_ERR("probe() failed to allocate memory\n");
return -ENOMEM;
}
info->i2c_info.i2c_dev = client;
info->i2c_info.read_irq = SEC_NFC_NONE;
mutex_init(&info->i2c_info.read_mutex);
init_waitqueue_head(&info->i2c_info.read_wait);
i2c_set_clientdata(client, info);
ret = gpio_request(pdata->irq, "nfc_int");
if (ret) {
NFC_LOG_ERR("probe() GPIO request is failed to register IRQ\n");
goto err_irq_req;
}
gpio_direction_input(pdata->irq);
ret = request_threaded_irq(client->irq, NULL, sec_nfc_irq_thread_fn,
IRQF_TRIGGER_RISING | IRQF_ONESHOT, SEC_NFC_DRIVER_NAME,
info);
if (ret < 0) {
NFC_LOG_ERR("probe() failed to register IRQ handler\n");
kfree(info->i2c_info.buf);
return ret;
}
if (of_get_property(dev->of_node, "sec-nfc,ldo_control", NULL)) {
if (pdata->nfc_pvdd != NULL) {
if (!lpcharge) {
ret = sec_nfc_regulator_onoff(pdata, NFC_I2C_LDO_ON);
if (ret < 0)
NFC_LOG_ERR("max86900_regulator_on fail err = %d\n", ret);
usleep_range(1000, 1100);
}
}
} else {
ret = gpio_request(pdata->pvdd_en, "nfc_pvdd_en");
if (ret < 0){
NFC_LOG_ERR("failed to request about pvdd_en pin\n");
return -ENODEV;
}
if(!lpcharge) {
gpio_direction_output(pdata->pvdd_en, 1);
}
NFC_LOG_INFO("pvdd en: %d\n", gpio_get_value(pdata->pvdd_en));
}
NFC_LOG_INFO("probe() success\n");
return 0;
err_irq_req:
return ret;
}
static irqreturn_t sec_nfc_clk_irq_thread(int irq, void *dev_id)
{
struct sec_nfc_info *info = dev_id;
struct sec_nfc_platform_data *pdata = info->pdata;
bool value;
value = gpio_get_value(pdata->clk_req) > 0 ? true : false;
NFC_LOG_REC("clock req: %d\n", value);
if (value == info->clk_state)
return IRQ_HANDLED;
if (value) {
int ret = clk_prepare_enable(pdata->clk);
if (ret) {
NFC_LOG_ERR("clock enable failed\n");
return IRQ_HANDLED;
}
if(!wake_lock_active(&info->nfc_clk_wake_lock))
wake_lock(&info->nfc_clk_wake_lock);
} else {
clk_disable_unprepare(pdata->clk);
if (wake_lock_active(&info->nfc_clk_wake_lock))
wake_unlock(&info->nfc_clk_wake_lock);
}
info->clk_state = value;
return IRQ_HANDLED;
}
#if 0
void sec_nfc_clk_ctl_enable(struct sec_nfc_info *info)
{
struct sec_nfc_platform_data *pdata = info->pdata;
if (info->clk_ctl)
return;
if (!pdata->clk)
return;
info->clk_state = false;
info->clk_ctl = true;
}
void sec_nfc_clk_ctl_disable(struct sec_nfc_info *info)
{
struct sec_nfc_platform_data *pdata = info->pdata;
if (wake_lock_active(&info->nfc_clk_wake_lock))
wake_unlock(&info->nfc_clk_wake_lock);
if (!info->clk_ctl)
return;
if (!pdata->clk)
return;
if (info->clk_state)
clk_disable_unprepare(pdata->clk);
info->clk_state = false;
info->clk_ctl = false;
}
#endif
static void sec_nfc_set_mode(struct sec_nfc_info *info,
enum sec_nfc_mode mode)
{
struct sec_nfc_platform_data *pdata = info->pdata;
/* intfo lock is aleady gotten before calling this function */
if (info->mode == mode) {
NFC_LOG_DBG("power mode is already %d", mode);
return;
}
info->mode = mode;
/* Skip interrupt during power switching
* It is released after first write
*/
mutex_lock(&info->i2c_info.read_mutex);
info->i2c_info.read_irq = SEC_NFC_SKIP;
mutex_unlock(&info->i2c_info.read_mutex);
gpio_set_value(pdata->ven, SEC_NFC_PW_OFF);
if (pdata->firm)
gpio_set_value(pdata->firm, SEC_NFC_FW_OFF);
if (mode == SEC_NFC_MODE_BOOTLOADER)
if (pdata->firm)
gpio_set_value(pdata->firm, SEC_NFC_FW_ON);
if (mode != SEC_NFC_MODE_OFF) {
msleep(SEC_NFC_VEN_WAIT_TIME);
gpio_set_value(pdata->ven, SEC_NFC_PW_ON);
/*sec_nfc_clk_ctl_enable(info);*/
enable_irq_wake(info->i2c_info.i2c_dev->irq);
msleep(SEC_NFC_VEN_WAIT_TIME/2);
} else {
/*sec_nfc_clk_ctl_disable(info);*/
disable_irq_wake(info->i2c_info.i2c_dev->irq);
}
if (wake_lock_active(&info->nfc_wake_lock))
wake_unlock(&info->nfc_wake_lock);
NFC_LOG_INFO("NFC mode is : %d\n", mode);
}
static long sec_nfc_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct sec_nfc_info *info = container_of(file->private_data,
struct sec_nfc_info, miscdev);
struct sec_nfc_platform_data *pdata = info->pdata;
unsigned int new = (unsigned int)arg;
int ret = 0;
NFC_LOG_DBG("cmd: 0x%x\n", cmd);
mutex_lock(&info->mutex);
switch (cmd) {
case SEC_NFC_DEBUG:
NFC_LOG_ERR("SEC_NFC_DEBUG\n");
nfc_state_print(info);
break;
case SEC_NFC_SET_MODE:
if (info->mode == new)
break;
if (new >= SEC_NFC_MODE_COUNT) {
NFC_LOG_ERR("wrong mode (%d)\n", new);
ret = -EFAULT;
break;
}
sec_nfc_set_mode(info, new);
break;
case SEC_NFC_SLEEP:
if (info->mode != SEC_NFC_MODE_BOOTLOADER) {
if (wake_lock_active(&info->nfc_wake_lock))
wake_unlock(&info->nfc_wake_lock);
gpio_set_value(pdata->wake, SEC_NFC_WAKE_SLEEP);
}
break;
case SEC_NFC_WAKEUP:
if (info->mode != SEC_NFC_MODE_BOOTLOADER) {
gpio_set_value(pdata->wake, SEC_NFC_WAKE_UP);
if (!wake_lock_active(&info->nfc_wake_lock))
wake_lock(&info->nfc_wake_lock);
}
break;
/*[START] NPT*/
case SEC_NFC_SET_NPT_MODE:
NFC_LOG_INFO("NPT: VEN=%d, FIRM:%d\n", gpio_get_value(pdata->ven),
gpio_get_value(pdata->firm));
if (new == SEC_NFC_NPT_CMD_ON) {
NFC_LOG_INFO("NPT: NFC OFF mode NPT - Turn on VEN.\n");
info->mode = SEC_NFC_MODE_FIRMWARE;
mutex_lock(&info->i2c_info.read_mutex);
info->i2c_info.read_irq = SEC_NFC_SKIP;
mutex_unlock(&info->i2c_info.read_mutex);
gpio_set_value(pdata->ven, SEC_NFC_PW_ON);
/*sec_nfc_clk_ctl_enable(info);*/
msleep(20);
gpio_set_value(pdata->firm, SEC_NFC_FW_ON);
enable_irq_wake(info->i2c_info.i2c_dev->irq);
} else if (new == SEC_NFC_NPT_CMD_OFF) {
NFC_LOG_INFO("NPT: NFC OFF mode NPT - Turn off VEN.\n");
info->mode = SEC_NFC_MODE_OFF;
gpio_set_value(pdata->firm, SEC_NFC_FW_OFF);
gpio_set_value(pdata->ven, SEC_NFC_PW_OFF);
/*sec_nfc_clk_ctl_disable(info);*/
disable_irq_wake(info->i2c_info.i2c_dev->irq);
}
break;
/*[END] NPT*/
default:
NFC_LOG_ERR("NPT: Unknown ioctl 0x%x\n", cmd);
ret = -ENOIOCTLCMD;
break;
}
mutex_unlock(&info->mutex);
return ret;
}
static int sec_nfc_open(struct inode *inode, struct file *file)
{
struct sec_nfc_info *info = container_of(file->private_data,
struct sec_nfc_info, miscdev);
int ret = 0;
NFC_LOG_INFO("%s\n", __func__);
mutex_lock(&info->mutex);
if (info->mode != SEC_NFC_MODE_OFF) {
NFC_LOG_ERR("open() nfc is busy\n");
nfc_state_print(info);
ret = -EBUSY;
goto out;
}
sec_nfc_set_mode(info, SEC_NFC_MODE_OFF);
out:
mutex_unlock(&info->mutex);
return ret;
}
static int sec_nfc_close(struct inode *inode, struct file *file)
{
struct sec_nfc_info *info = container_of(file->private_data,
struct sec_nfc_info, miscdev);
if (wake_lock_active(&info->nfc_clk_wake_lock))
wake_unlock(&info->nfc_clk_wake_lock);
nfc_state_print(info);
NFC_LOG_INFO("%s\n", __func__);
mutex_lock(&info->mutex);
sec_nfc_set_mode(info, SEC_NFC_MODE_OFF);
mutex_unlock(&info->mutex);
return 0;
}
static const struct file_operations sec_nfc_fops = {
.owner = THIS_MODULE,
.read = sec_nfc_read,
.write = sec_nfc_write,
.poll = sec_nfc_poll,
.open = sec_nfc_open,
.release = sec_nfc_close,
.unlocked_ioctl = sec_nfc_ioctl,
};
#ifdef CONFIG_PM
static int sec_nfc_suspend(struct device *dev)
{
struct sec_nfc_info *info = SEC_NFC_GET_INFO(dev);
int ret = 0;
mutex_lock(&info->mutex);
if (info->mode == SEC_NFC_MODE_BOOTLOADER)
ret = -EPERM;
mutex_unlock(&info->mutex);
return ret;
}
static int sec_nfc_resume(struct device *dev)
{
return 0;
}
static SIMPLE_DEV_PM_OPS(sec_nfc_pm_ops, sec_nfc_suspend, sec_nfc_resume);
#endif
/*device tree parsing*/
static int sec_nfc_parse_dt(struct device *dev,
struct sec_nfc_platform_data *pdata)
{
struct device_node *np = dev->of_node;
pdata->ven = of_get_named_gpio(np, "sec-nfc,ven-gpio", 0);
pdata->firm = of_get_named_gpio(np, "sec-nfc,firm-gpio", 0);
pdata->wake = pdata->firm;
pdata->irq = of_get_named_gpio(np, "sec-nfc,irq-gpio", 0);
if (of_get_property(dev->of_node, "sec-nfc,nfc_ap_clk", NULL)) {
pdata->clk_req = of_get_named_gpio(np, "sec-nfc,clk_req-gpio", 0);
NFC_LOG_INFO("parse_dt() clk_req : %d\n", pdata->clk_req);
}
if (of_get_property(dev->of_node, "sec-nfc,ldo_control", NULL)) {
if (of_property_read_string(np, "sec-nfc,nfc_pvdd",
&pdata->nfc_pvdd) < 0) {
NFC_LOG_ERR("parse_dt() get nfc_pvdd error\n");
pdata->nfc_pvdd = NULL;
}
} else {
pdata->pvdd_en = of_get_named_gpio(np, "sec-nfc,pvdd_en", 0);
NFC_LOG_INFO("parse_dt() pvdd_en : %d\n", pdata->pvdd_en);
}
NFC_LOG_INFO("parse_dt() irq : %d, ven : %d, firm : %d\n",
pdata->irq, pdata->ven, pdata->firm);
return 0;
}
#ifdef FEATURE_SEC_NFC_TEST
static int sec_nfc_i2c_read(char *buf, int count)
{
struct sec_nfc_info *info = g_nfc_info;
int ret = 0;
mutex_lock(&info->mutex);
if (info->mode == SEC_NFC_MODE_OFF) {
NFC_LOG_ERR("NFC_TEST: sec_nfc is not enabled\n");
ret = -ENODEV;
goto out;
}
/* i2c recv */
if (count > info->i2c_info.buflen)
count = info->i2c_info.buflen;
if (count > SEC_NFC_MSG_MAX_SIZE) {
NFC_LOG_ERR("NFC_TEST: user required wrong size :%d\n", (u32)count);
ret = -EINVAL;
goto out;
}
mutex_lock(&info->i2c_info.read_mutex);
memset(buf, 0, count);
ret = i2c_master_recv(info->i2c_info.i2c_dev, buf, (u32)count);
NFC_LOG_INFO("NFC_TEST: recv size : %d\n", ret);
if (ret == -EREMOTEIO) {
ret = -ERESTART;
goto read_error;
} else if (ret != count) {
NFC_LOG_ERR("NFC_TEST: read failed: return: %d count: %d\n",
ret, (u32)count);
goto read_error;
}
mutex_unlock(&info->i2c_info.read_mutex);
goto out;
read_error:
info->i2c_info.read_irq = SEC_NFC_NONE;
mutex_unlock(&info->i2c_info.read_mutex);
out:
mutex_unlock(&info->mutex);
return ret;
}
static int sec_nfc_i2c_write(char *buf, int count)
{
struct sec_nfc_info *info = g_nfc_info;
int ret = 0;
mutex_lock(&info->mutex);
if (info->mode == SEC_NFC_MODE_OFF) {
NFC_LOG_ERR("NFC_TEST: sec_nfc is not enabled\n");
ret = -ENODEV;
goto out;
}
if (count > info->i2c_info.buflen)
count = info->i2c_info.buflen;
if (count > SEC_NFC_MSG_MAX_SIZE) {
NFC_LOG_ERR("NFC_TEST: user required wrong size :%d\n", (u32)count);
ret = -EINVAL;
goto out;
}
mutex_lock(&info->i2c_info.read_mutex);
ret = i2c_master_send(info->i2c_info.i2c_dev, buf, count);
mutex_unlock(&info->i2c_info.read_mutex);
if (ret == -EREMOTEIO) {
NFC_LOG_ERR("NFC_TEST: send failed: return: %d count: %d\n",
ret, (u32)count);
ret = -ERESTART;
goto out;
}
if (ret != count) {
NFC_LOG_ERR("NFC_TEST: send failed: return: %d count: %d\n",
ret, (u32)count);
ret = -EREMOTEIO;
}
out:
mutex_unlock(&info->mutex);
return ret;
}
static ssize_t test_show(struct class *class,
struct class_attribute *attr,
char *buf)
{
char cmd[8] = {0x0, 0x1, 0x0, 0x0,}; /*bootloader fw check*/
enum sec_nfc_mode old_mode = g_nfc_info->mode;
int size;
int ret = 0;
int timeout = 1;
on_nfc_test = true;
nfc_int_wait = false;
NFC_LOG_INFO("NFC_TEST: mode = %d\n", old_mode);
sec_nfc_set_mode(g_nfc_info, SEC_NFC_MODE_BOOTLOADER);
ret = sec_nfc_i2c_write(cmd, 4);
if (ret < 0) {
NFC_LOG_INFO("NFC_TEST: i2c write error %d\n", ret);
size = sprintf(buf, "NFC_TEST: i2c write error %d\n", ret);
goto exit;
}
timeout = wait_event_interruptible_timeout(g_nfc_info->i2c_info.read_wait, nfc_int_wait, 100);
ret = sec_nfc_i2c_read(buf, 16);
if (ret < 0) {
NFC_LOG_INFO("NFC_TEST: i2c read error %d\n", ret);
size = sprintf(buf, "NFC_TEST: i2c read error %d\n", ret);
goto exit;
}
NFC_LOG_INFO("NFC_TEST: BL ver: %02X %02X %02X %02X, INT: %s\n", buf[0],
buf[1], buf[2], buf[3], timeout ? "OK":"NOK");
size = sprintf(buf, "BL ver: %02X.%02X.%02X.%02X, INT: %s\n", buf[0],
buf[1], buf[2], buf[3], timeout ? "OK":"NOK");
exit:
sec_nfc_set_mode(g_nfc_info, old_mode);
on_nfc_test = false;
return size;
}
static ssize_t test_store(struct class *dev,
struct class_attribute *attr,
const char *buf, size_t size)
{
return size;
}
static CLASS_ATTR_RW(test);
#endif
static ssize_t nfc_support_show(struct class *class,
struct class_attribute *attr, char *buf)
{
NFC_LOG_INFO("\n");
return 0;
}
static CLASS_ATTR_RO(nfc_support);
static int __sec_nfc_probe(struct device *dev)
{
struct sec_nfc_info *info;
struct sec_nfc_platform_data *pdata = NULL;
struct pinctrl *pinctrl = NULL;
int ret = 0;
int nfc_support = 0;
#ifdef FEATURE_SEC_NFC_TEST
struct class *nfc_class;
#endif
NFC_LOG_INFO("probe start\n");
if (dev->of_node) {
pdata = devm_kzalloc(dev,
sizeof(struct sec_nfc_platform_data), GFP_KERNEL);
if (!pdata) {
NFC_LOG_ERR("probe() Failed to allocate memory\n");
return -ENOMEM;
}
ret = sec_nfc_parse_dt(dev, pdata);
if (ret)
return ret;
} else {
pdata = dev->platform_data;
}
if (!pdata) {
NFC_LOG_ERR("probe() No platform data\n");
ret = -ENOMEM;
goto err_pdata;
}
info = kzalloc(sizeof(struct sec_nfc_info), GFP_KERNEL);
if (!info) {
NFC_LOG_ERR("probe() failed to allocate memory for sec_nfc_info\n");
ret = -ENOMEM;
goto err_info_alloc;
}
info->dev = dev;
info->pdata = pdata;
info->mode = SEC_NFC_MODE_OFF;
mutex_init(&info->mutex);
wake_lock_init(&info->nfc_wake_lock, WAKE_LOCK_SUSPEND, "nfc_wake_lock");
wake_lock_init(&info->nfc_clk_wake_lock, WAKE_LOCK_SUSPEND, "nfc_clk_wake_lock");
dev_set_drvdata(dev, info);
info->miscdev.minor = MISC_DYNAMIC_MINOR;
info->miscdev.name = SEC_NFC_DRIVER_NAME;
info->miscdev.fops = &sec_nfc_fops;
info->miscdev.parent = dev;
/*separate NFC / non NFC using GPIO*/
if (of_find_property(dev->of_node, "sec-nfc,check_nfc", NULL)) {
nfc_support = gpio_get_value(of_get_named_gpio(dev->of_node, "sec-nfc,check_nfc", 0));
if (nfc_support > 0) {
NFC_LOG_INFO("nfc support model : %d\n", nfc_support);
}else{
pinctrl = devm_pinctrl_get_select(dev, "nfc_nc");
if (IS_ERR_OR_NULL(pinctrl))
NFC_LOG_ERR("Failed to configure nfc NC pin\n");
else
devm_pinctrl_put(pinctrl);
NFC_LOG_INFO("nfc not support model : %d\n", nfc_support);
return -ENXIO;
}
}
ret = misc_register(&info->miscdev);
if (ret < 0) {
NFC_LOG_ERR("probe() failed to register Device\n");
goto err_dev_reg;
}
if (of_get_property(dev->of_node, "sec-nfc,nfc_ap_clk", NULL)) {
pdata->clk = clk_get(dev, "oscclk_nfc");
if (IS_ERR(pdata->clk)) {
NFC_LOG_ERR("probe() clk not found\n");
goto err_gpio_clk_parse;
}
pdata->clk_irq = gpio_to_irq(pdata->clk_req);
ret = request_threaded_irq(pdata->clk_irq, NULL, sec_nfc_clk_irq_thread,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
SEC_NFC_DRIVER_NAME, info);
if (ret < 0)
NFC_LOG_ERR("probe() failed to register CLK REQ IRQ handler\n");
else
enable_irq_wake(pdata->clk_irq);
}
ret = gpio_request(pdata->ven, "nfc_ven");
if (ret) {
NFC_LOG_ERR("probe() failed to get gpio ven\n");
goto err_gpio_ven;
}
gpio_direction_output(pdata->ven, SEC_NFC_PW_OFF);
if (pdata->firm) {
ret = gpio_request(pdata->firm, "nfc_firm");
if (ret) {
NFC_LOG_ERR("probe() failed to get gpio firm\n");
goto err_gpio_firm;
}
gpio_direction_output(pdata->firm, SEC_NFC_FW_OFF);
}
#ifdef FEATURE_SEC_NFC_TEST
g_nfc_info = info;
nfc_class = class_create(THIS_MODULE, "nfc_test");
if (IS_ERR(&nfc_class))
NFC_LOG_ERR("NFC: failed to create nfc_test class\n");
else {
ret = class_create_file(nfc_class, &class_attr_test);
if (ret)
NFC_LOG_ERR("NFC: failed to create attr_test\n");
}
#endif
nfc_class = class_create(THIS_MODULE, "nfc");
if (IS_ERR(&nfc_class))
NFC_LOG_ERR("NFC: failed to create nfc class\n");
else {
ret = class_create_file(nfc_class, &class_attr_nfc_support);
if (ret)
NFC_LOG_ERR("NFC: failed to create attr_nfc_support\n");
}
NFC_LOG_INFO("probe() success\n");
return 0;
err_gpio_firm:
gpio_free(pdata->ven);
err_gpio_ven:
free_irq(pdata->clk_irq, info);
err_gpio_clk_parse:
misc_deregister(&info->miscdev);
err_dev_reg:
mutex_destroy(&info->mutex);
kfree(info);
err_info_alloc:
devm_kfree(dev, pdata);
err_pdata:
return ret;
}
static int __sec_nfc_remove(struct device *dev)
{
struct sec_nfc_info *info = dev_get_drvdata(dev);
struct i2c_client *client = info->i2c_info.i2c_dev;
struct sec_nfc_platform_data *pdata = info->pdata;
NFC_LOG_DBG("remove\n");
misc_deregister(&info->miscdev);
sec_nfc_set_mode(info, SEC_NFC_MODE_OFF);
free_irq(client->irq, info);
free_irq(pdata->clk_irq, info);
gpio_free(pdata->irq);
gpio_set_value(pdata->firm, 0);
gpio_free(pdata->ven);
if (pdata->firm)
gpio_free(pdata->firm);
wake_lock_destroy(&info->nfc_wake_lock);
kfree(info);
return 0;
}
MODULE_DEVICE_TABLE(i2c, sec_nfc_id_table);
#define SEC_NFC_INIT(driver) i2c_add_driver(driver)
#define SEC_NFC_EXIT(driver) i2c_del_driver(driver)
static int sec_nfc_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret = 0;
nfc_logger_init();
#ifdef CONFIG_ESE_SECURE
ret = exynos_smc(0x83000032, 0 , 0, 0);
if (ret == EBUSY) {
NFC_LOG_ERR("eSE spi secure fail!\n");
return -EBUSY;
}
#endif
ret = __sec_nfc_probe(&client->dev);
if (ret)
return ret;
if (sec_nfc_i2c_probe(client))
__sec_nfc_remove(&client->dev);
return ret;
}
static int sec_nfc_remove(struct i2c_client *client)
{
return __sec_nfc_remove(&client->dev);
}
static struct i2c_device_id sec_nfc_id_table[] = {
{ SEC_NFC_DRIVER_NAME, 0 },
{ }
};
static const struct of_device_id nfc_match_table[] = {
{ .compatible = SEC_NFC_DRIVER_NAME,},
{},
};
static struct i2c_driver sec_nfc_driver = {
.probe = sec_nfc_probe,
.id_table = sec_nfc_id_table,
.remove = sec_nfc_remove,
.driver = {
.name = SEC_NFC_DRIVER_NAME,
#ifdef CONFIG_PM
.pm = &sec_nfc_pm_ops,
#endif
.of_match_table = nfc_match_table,
.suppress_bind_attrs = true,
},
};
static int __init sec_nfc_init(void)
{
return SEC_NFC_INIT(&sec_nfc_driver);
}
static void __exit sec_nfc_exit(void)
{
SEC_NFC_EXIT(&sec_nfc_driver);
}
module_init(sec_nfc_init);
module_exit(sec_nfc_exit);
MODULE_DESCRIPTION("Samsung sec_nfc driver");
MODULE_LICENSE("GPL");
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