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gerrit-public.fairphone.software / kernel / msm-4.19 / 86dfee8338820125c1fe05006bac726811e23c1b / . / drivers / nfc / st21nfc.c
blob: 2a7b3a0f90914094f423274b18618410e884c228 [file] [log] [blame]
/*
* 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/>.
*/
#define DEBUG
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/version.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/jiffies.h>
#include <linux/uaccess.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/poll.h>
#include <linux/miscdevice.h>
#include <linux/spinlock.h>
#include <linux/of_gpio.h>
#ifndef LEGACY
#include <linux/workqueue.h>
#include <linux/acpi.h>
#include <linux/gpio/consumer.h>
#include <net/nfc/nci.h>
#include <linux/clk.h>
#else
#include <linux/gpio.h>
#include <linux/of.h>
#include <linux/of_address.h>
#endif
#include <linux/of_irq.h>
#include "st21nfc.h"
//#define ST21NFCD_MTK
//#define ST54J_PWRSTATS
#ifdef ST21NFCD_MTK
// 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
#define KRNMTKLEGACY_CLK 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_ctl.h>
#endif
#endif
#endif // ST21NFCD_MTK
#define MAX_BUFFER_SIZE 260
#define HEADER_LENGTH 3
#define IDLE_CHARACTER 0x7e
#define ST21NFC_POWER_STATE_MAX 3
// wake up for the duration of a typical transaction
#define WAKEUP_SRC_TIMEOUT (500)
#define DRIVER_VERSION "2.2.0.14"
#define PROP_PWR_MON_RW_ON_NTF nci_opcode_pack(NCI_GID_PROPRIETARY, 5)
#define PROP_PWR_MON_RW_OFF_NTF nci_opcode_pack(NCI_GID_PROPRIETARY, 6)
#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 */
static bool enable_debug_log;
/*The enum is used to index a pw_states array, the values matter here*/
enum st21nfc_power_state {
ST21NFC_IDLE = 0,
ST21NFC_ACTIVE = 1,
ST21NFC_ACTIVE_RW = 2
};
static const char *const st21nfc_power_state_name[] = {"IDLE", "ACTIVE",
"ACTIVE_RW"};
enum st21nfc_read_state { ST21NFC_HEADER, ST21NFC_PAYLOAD };
struct nfc_sub_power_stats {
uint64_t count;
uint64_t duration;
uint64_t last_entry;
uint64_t last_exit;
};
struct nfc_sub_power_stats_error {
/* error transition header --> payload state machine */
uint64_t header_payload;
/* error transition from an active state when not in idle state */
uint64_t active_not_idle;
/* error transition from idle state to idle state */
uint64_t idle_to_idle;
/* warning transition from active_rw state to idle state */
uint64_t active_rw_to_idle;
/* error transition from active state to active state */
uint64_t active_to_active;
/* error transition from idle state to active state with notification */
uint64_t idle_to_active_ntf;
/* error transition from active_rw state to active_rw state */
uint64_t act_rw_to_act_rw;
/* error transition from idle state to */
/* active_rw state with notification */
uint64_t idle_to_active_rw_ntf;
};
/*
* The member 'polarity_mode' defines
* how the wakeup pin is configured and handled.
* it can take the following values :
* IRQF_TRIGGER_RISING
* IRQF_TRIGGER_HIGH
*/
struct st21nfc_device {
wait_queue_head_t read_wq;
struct mutex read_mutex;
struct mutex pidle_mutex;
struct i2c_client *client;
struct miscdevice st21nfc_device;
uint8_t buffer[MAX_BUFFER_SIZE];
bool irq_enabled;
bool irq_wake_up;
bool irq_is_attached;
bool device_open; /* Is device open? */
spinlock_t irq_enabled_lock;
enum st21nfc_power_state pw_current;
enum st21nfc_read_state r_state_current;
int irq_pw_stats_idle;
int p_idle_last;
struct nfc_sub_power_stats pw_states[ST21NFC_POWER_STATE_MAX];
struct nfc_sub_power_stats_error pw_states_err;
struct workqueue_struct *st_p_wq;
struct work_struct st_p_work;
/*Power state shadow copies for reading*/
enum st21nfc_power_state c_pw_current;
struct nfc_sub_power_stats c_pw_states[ST21NFC_POWER_STATE_MAX];
struct nfc_sub_power_stats_error c_pw_states_err;
/* CLK control */
bool clk_run;
struct clk *s_clk;
uint8_t pinctrl_en;
/* GPIO for NFCC IRQ pin (input) */
struct gpio_desc *gpiod_irq;
/* GPIO for NFCC Reset pin (output) */
struct gpio_desc *gpiod_reset;
/* GPIO for NFCC CLK_REQ pin (input) */
struct gpio_desc *gpiod_clkreq;
/* GPIO for NFCC CLF_MONITOR_PWR (input) */
struct gpio_desc *gpiod_pidle;
/* irq_gpio polarity to be used */
unsigned int polarity_mode;
};
/*
* Routine to enable clock.
* this routine can be extended to select from multiple
* sources based on clk_src_name.
*/
static int st21nfc_clock_select(struct st21nfc_device *st21nfc_dev) {
#ifdef ST21NFCD_MTK
#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 0;
#else // ST21NFCD_MTK
int ret = 0;
st21nfc_dev->s_clk = clk_get(&st21nfc_dev->client->dev, "nfc_ref_clk");
/* if NULL we assume external crystal and dont fail */
if (IS_ERR_OR_NULL(st21nfc_dev->s_clk)) return 0;
if (st21nfc_dev->clk_run == false) {
ret = clk_prepare_enable(st21nfc_dev->s_clk);
if (ret) goto err_clk;
st21nfc_dev->clk_run = true;
}
return ret;
err_clk:
return -EINVAL;
#endif // ST21NFCD_MTK
}
/*
* Routine to disable clocks
*/
static int st21nfc_clock_deselect(struct st21nfc_device *st21nfc_dev) {
#ifdef ST21NFCD_MTK
#ifndef NO_MTK_CLK_MANAGEMENT
clk_buf_ctrl(CLK_BUF_NFC, false);
#endif
return 0;
#else // ST21NFCD_MTK
/* if NULL we assume external crystal and dont fail */
if (IS_ERR_OR_NULL(st21nfc_dev->s_clk)) return 0;
if (st21nfc_dev->clk_run == true) {
clk_disable_unprepare(st21nfc_dev->s_clk);
st21nfc_dev->clk_run = false;
}
return 0;
#endif // ST21NFCD_MTK
}
static void st21nfc_disable_irq(struct st21nfc_device *st21nfc_dev) {
unsigned long flags;
spin_lock_irqsave(&st21nfc_dev->irq_enabled_lock, flags);
if (st21nfc_dev->irq_enabled) {
disable_irq_nosync(st21nfc_dev->client->irq);
st21nfc_dev->irq_enabled = false;
}
spin_unlock_irqrestore(&st21nfc_dev->irq_enabled_lock, flags);
}
static void st21nfc_enable_irq(struct st21nfc_device *st21nfc_dev) {
unsigned long flags;
spin_lock_irqsave(&st21nfc_dev->irq_enabled_lock, flags);
if (!st21nfc_dev->irq_enabled) {
st21nfc_dev->irq_enabled = true;
enable_irq(st21nfc_dev->client->irq);
}
spin_unlock_irqrestore(&st21nfc_dev->irq_enabled_lock, flags);
}
static irqreturn_t st21nfc_dev_irq_handler(int irq, void *dev_id) {
struct st21nfc_device *st21nfc_dev = dev_id;
if (device_may_wakeup(&st21nfc_dev->client->dev))
pm_wakeup_event(&st21nfc_dev->client->dev, WAKEUP_SRC_TIMEOUT);
st21nfc_disable_irq(st21nfc_dev);
/* Wake up waiting readers */
wake_up(&st21nfc_dev->read_wq);
return IRQ_HANDLED;
}
static int st21nfc_loc_set_polaritymode(struct st21nfc_device *st21nfc_dev,
int mode) {
struct i2c_client *client = st21nfc_dev->client;
struct device *dev = &client->dev;
unsigned int irq_type;
int ret;
if (enable_debug_log) pr_info("%s:%d mode %d", __FILE__, __LINE__, mode);
st21nfc_dev->polarity_mode = mode;
/* setup irq_flags */
switch (mode) {
case IRQF_TRIGGER_RISING:
irq_type = IRQ_TYPE_EDGE_RISING;
break;
case IRQF_TRIGGER_HIGH:
irq_type = IRQ_TYPE_LEVEL_HIGH;
break;
default:
irq_type = IRQ_TYPE_EDGE_RISING;
break;
}
if (st21nfc_dev->irq_is_attached) {
devm_free_irq(dev, client->irq, st21nfc_dev);
st21nfc_dev->irq_is_attached = false;
}
ret = irq_set_irq_type(client->irq, irq_type);
if (ret) {
pr_err("%s : set_irq_type failed\n", __func__);
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 = devm_request_irq(dev, client->irq, st21nfc_dev_irq_handler,
st21nfc_dev->polarity_mode, client->name, st21nfc_dev);
if (ret) {
pr_err("%s : devm_request_irq failed\n", __func__);
return -ENODEV;
}
st21nfc_dev->irq_is_attached = true;
st21nfc_disable_irq(st21nfc_dev);
if (enable_debug_log) pr_info("%s:%d ret %d", __FILE__, __LINE__, ret);
return ret;
}
static void st21nfc_power_stats_switch(struct st21nfc_device *st21nfc_dev,
uint64_t current_time_ms,
enum st21nfc_power_state old_state,
enum st21nfc_power_state new_state,
bool is_ntf) {
mutex_lock(&st21nfc_dev->pidle_mutex);
if (new_state == old_state) {
if ((st21nfc_dev->pw_states[ST21NFC_IDLE].last_entry != 0) ||
(old_state != ST21NFC_IDLE)) {
pr_err("%s Error: Switched from %s to %s!: %llx, ntf=%d\n", __func__,
st21nfc_power_state_name[old_state],
st21nfc_power_state_name[new_state], current_time_ms, is_ntf);
if (new_state == ST21NFC_IDLE)
st21nfc_dev->pw_states_err.idle_to_idle++;
else if (new_state == ST21NFC_ACTIVE)
st21nfc_dev->pw_states_err.active_to_active++;
else if (new_state == ST21NFC_ACTIVE_RW)
st21nfc_dev->pw_states_err.act_rw_to_act_rw++;
mutex_unlock(&st21nfc_dev->pidle_mutex);
return;
}
} else if (!is_ntf && new_state == ST21NFC_ACTIVE &&
old_state != ST21NFC_IDLE) {
st21nfc_dev->pw_states_err.active_not_idle++;
} else if (!is_ntf && new_state == ST21NFC_IDLE &&
old_state == ST21NFC_ACTIVE_RW) {
st21nfc_dev->pw_states_err.active_rw_to_idle++;
} else if (is_ntf && new_state == ST21NFC_ACTIVE &&
old_state == ST21NFC_IDLE) {
st21nfc_dev->pw_states_err.idle_to_active_ntf++;
} else if (is_ntf && new_state == ST21NFC_ACTIVE_RW &&
old_state == ST21NFC_IDLE) {
st21nfc_dev->pw_states_err.idle_to_active_rw_ntf++;
}
pr_debug("%s Switching from %s to %s: %llx, ntf=%d\n", __func__,
st21nfc_power_state_name[old_state],
st21nfc_power_state_name[new_state], current_time_ms, is_ntf);
st21nfc_dev->pw_states[old_state].last_exit = current_time_ms;
st21nfc_dev->pw_states[old_state].duration +=
st21nfc_dev->pw_states[old_state].last_exit -
st21nfc_dev->pw_states[old_state].last_entry;
st21nfc_dev->pw_states[new_state].count++;
st21nfc_dev->pw_current = new_state;
st21nfc_dev->pw_states[new_state].last_entry = current_time_ms;
mutex_unlock(&st21nfc_dev->pidle_mutex);
}
static void st21nfc_power_stats_idle_signal(
struct st21nfc_device *st21nfc_dev) {
uint64_t current_time_ms = ktime_to_ms(ktime_get_boottime());
int value = gpiod_get_value(st21nfc_dev->gpiod_pidle);
if (value != 0) {
st21nfc_power_stats_switch(st21nfc_dev, current_time_ms,
st21nfc_dev->pw_current, ST21NFC_ACTIVE, false);
} else {
st21nfc_power_stats_switch(st21nfc_dev, current_time_ms,
st21nfc_dev->pw_current, ST21NFC_IDLE, false);
}
}
void st21nfc_pstate_wq(struct work_struct *work) {
struct st21nfc_device *st21nfc_dev =
container_of(work, struct st21nfc_device, st_p_work);
st21nfc_power_stats_idle_signal(st21nfc_dev);
}
static irqreturn_t st21nfc_dev_power_stats_handler(int irq, void *dev_id) {
struct st21nfc_device *st21nfc_dev = dev_id;
queue_work(st21nfc_dev->st_p_wq, &(st21nfc_dev->st_p_work));
return IRQ_HANDLED;
}
#ifdef ST54J_PWRSTATS
static void st21nfc_power_stats_filter(struct st21nfc_device *st21nfc_dev,
char *buf, size_t count) {
uint64_t current_time_ms = ktime_to_ms(ktime_get_boottime());
__u16 ntf_opcode = nci_opcode(buf);
if (IS_ERR_OR_NULL(st21nfc_dev->gpiod_pidle)) return;
/* In order to avoid counting active state on PAYLOAD where it would
* match a possible header, power states are filtered only on NCI
* headers.
*/
if (st21nfc_dev->r_state_current != ST21NFC_HEADER) return;
if (count != HEADER_LENGTH) {
pr_err("%s Warning: expect previous one was idle data\n");
st21nfc_dev->pw_states_err.header_payload++;
return;
}
if (nci_mt(buf) != NCI_MT_NTF_PKT &&
nci_opcode_gid(ntf_opcode) != NCI_GID_PROPRIETARY)
return;
switch (ntf_opcode) {
case PROP_PWR_MON_RW_OFF_NTF:
st21nfc_power_stats_switch(st21nfc_dev, current_time_ms,
st21nfc_dev->pw_current, ST21NFC_ACTIVE, true);
break;
case PROP_PWR_MON_RW_ON_NTF:
st21nfc_power_stats_switch(st21nfc_dev, current_time_ms,
st21nfc_dev->pw_current, ST21NFC_ACTIVE_RW,
true);
break;
default:
return;
}
return;
}
#endif
static ssize_t st21nfc_dev_read(struct file *filp, char __user *buf,
size_t count, loff_t *offset) {
struct st21nfc_device *st21nfc_dev =
container_of(filp->private_data, struct st21nfc_device, st21nfc_device);
int ret;
#ifdef ST54J_PWRSTATS
int idle = 0;
#endif // ST54J_PWRSTATS
if (count == 0) return 0;
if (count > MAX_BUFFER_SIZE) count = MAX_BUFFER_SIZE;
if (enable_debug_log) pr_debug("%s : reading %zu bytes.\n", __func__, count);
if (0 == gpiod_get_value(st21nfc_dev->gpiod_irq)) {
pr_info("%s : read called but no IRQ.\n", __func__);
memset(st21nfc_dev->buffer, 0x7E, count);
if (copy_to_user(buf, st21nfc_dev->buffer, count)) {
pr_warn("%s : failed to copy to user space\n", __func__);
return -EFAULT;
}
return count;
}
mutex_lock(&st21nfc_dev->read_mutex);
/* Read data */
#ifdef KRNMTKLEGACY_I2C
st21nfc_dev->client->addr = (st21nfc_dev->client->addr & I2C_MASK_FLAG);
st21nfc_dev->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->client->timing = NFC_CLIENT_TIMING;
/* Read data */
ret = i2c_master_recv(st21nfc_dev->client,
(unsigned char *)(uintptr_t)I2CDMAReadBuf_pa, count);
/* copy back to buffer */
if (ret > 0) {
memcpy(st21nfc_dev->buffer, (unsigned char *)(uintptr_t)I2CDMAReadBuf_pa,
ret);
}
#else
ret = i2c_master_recv(st21nfc_dev->client, st21nfc_dev->buffer, count);
#endif
#ifdef ST54J_PWRSTATS
if (ret < 0) {
pr_err("%s: i2c_master_recv returned %d\n", __func__, ret);
mutex_unlock(&st21nfc_dev->read_mutex);
return ret;
}
if (st21nfc_dev->r_state_current == ST21NFC_HEADER) {
/* Counting idle index */
for (idle = 0; idle < ret && st21nfc_dev->buffer[idle] == IDLE_CHARACTER;
idle++)
;
if (idle > 0 && idle < HEADER_LENGTH) {
memmove(st21nfc_dev->buffer, st21nfc_dev->buffer + idle, ret - idle);
ret = i2c_master_recv(st21nfc_dev->client,
st21nfc_dev->buffer + ret - idle, idle);
if (ret < 0) {
pr_err("%s: i2c_master_recv returned %d\n", __func__, ret);
mutex_unlock(&st21nfc_dev->read_mutex);
return ret;
}
ret = count;
}
}
#endif // ST54J_PWRSTATS
mutex_unlock(&st21nfc_dev->read_mutex);
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 ST54J_PWRSTATS
if (idle < HEADER_LENGTH) {
st21nfc_power_stats_filter(st21nfc_dev, st21nfc_dev->buffer, ret);
/* change state only if a payload is detected, i.e. size > 0*/
if ((st21nfc_dev->r_state_current == ST21NFC_HEADER) &&
(st21nfc_dev->buffer[2] > 0)) {
st21nfc_dev->r_state_current = ST21NFC_PAYLOAD;
if (enable_debug_log)
pr_debug("%s : new state = ST21NFC_PAYLOAD\n", __func__);
} else {
st21nfc_dev->r_state_current = ST21NFC_HEADER;
if (enable_debug_log)
pr_debug("%s : new state = ST21NFC_HEADER\n", __func__);
}
}
#endif // ST54J_PWRSTATS
if (copy_to_user(buf, st21nfc_dev->buffer, ret)) {
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_device *st21nfc_dev =
container_of(filp->private_data, struct st21nfc_device, st21nfc_device);
char *tmp = NULL;
int ret = count;
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;
tmp = memdup_user(buf, count);
if (IS_ERR_OR_NULL(tmp)) {
pr_err("%s : memdup_user failed\n", __func__);
return -EFAULT;
}
/* Write data */
#ifdef KRNMTKLEGACY_I2C
memcpy(I2CDMAWriteBuf, tmp, count);
st21nfc_dev->client->addr = (st21nfc_dev->client->addr & I2C_MASK_FLAG);
st21nfc_dev->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->client->timing = NFC_CLIENT_TIMING;
ret = i2c_master_send(st21nfc_dev->client,
(unsigned char *)(uintptr_t)I2CDMAWriteBuf_pa, count);
#else
ret = i2c_master_send(st21nfc_dev->client, tmp, count);
#endif
if (ret != count) {
pr_err("%s : i2c_master_send returned %d\n", __func__, ret);
ret = -EIO;
}
kfree(tmp);
return ret;
}
static int st21nfc_dev_open(struct inode *inode, struct file *filp) {
int ret = 0;
struct st21nfc_device *st21nfc_dev =
container_of(filp->private_data, struct st21nfc_device, st21nfc_device);
if (enable_debug_log) pr_info("%s:%d dev_open", __FILE__, __LINE__);
if (st21nfc_dev->device_open) {
ret = -EBUSY;
pr_err("%s : device already opened ret= %d\n", __func__, ret);
} else {
st21nfc_dev->device_open = true;
}
return ret;
}
static int st21nfc_release(struct inode *inode, struct file *file) {
struct st21nfc_device *st21nfc_dev =
container_of(file->private_data, struct st21nfc_device, st21nfc_device);
st21nfc_dev->device_open = false;
if (enable_debug_log) pr_debug("%s : device_open = false\n", __func__);
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) {
if (enable_debug_log) pr_info("%s\n", __func__);
st21nfc_st54spi_cb = cb;
st21nfc_st54spi_data = data;
}
void st21nfc_unregister_st54spi_cb(void) {
if (enable_debug_log) 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_device *st21nfc_dev =
container_of(filp->private_data, struct st21nfc_device, 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_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_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 (!IS_ERR_OR_NULL(st21nfc_dev->gpiod_reset)) {
if (st21nfc_st54spi_cb != 0)
(*st21nfc_st54spi_cb)(ST54SPI_CB_RESET_START, st21nfc_st54spi_data);
/* pulse low for 20 millisecs */
gpiod_set_value(st21nfc_dev->gpiod_reset, 0);
msleep(20);
gpiod_set_value(st21nfc_dev->gpiod_reset, 1);
usleep_range(10000, 11000);
/* pulse low for 20 millisecs */
gpiod_set_value(st21nfc_dev->gpiod_reset, 0);
msleep(20);
gpiod_set_value(st21nfc_dev->gpiod_reset, 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);
}
st21nfc_dev->r_state_current = ST21NFC_HEADER;
break;
case ST21NFC_GET_WAKEUP:
case ST21NFC_LEGACY_GET_WAKEUP:
/* deliver state of Wake_up_pin as return value of ioctl */
ret = gpiod_get_value(st21nfc_dev->gpiod_irq);
/*
* Warning: depending on gpiod_get_value implementation,
* it can returns a value different than 1 in case of high level
*/
if (ret != 0) ret = 1;
if (enable_debug_log) pr_debug("%s get gpio result %d\n", __func__, ret);
break;
case ST21NFC_GET_POLARITY:
case ST21NFC_LEGACY_GET_POLARITY:
ret = st21nfc_dev->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 (!IS_ERR_OR_NULL(st21nfc_dev->gpiod_reset)) {
if (st21nfc_dev->irq_is_attached) {
devm_free_irq(&st21nfc_dev->client->dev, st21nfc_dev->client->irq,
st21nfc_dev);
st21nfc_dev->irq_is_attached = false;
}
/* pulse low for 20 millisecs */
gpiod_set_value(st21nfc_dev->gpiod_reset, 0);
usleep_range(10000, 11000);
/* During the reset, force IRQ OUT as */
/* DH output instead of input in normal usage */
ret = gpiod_direction_output(st21nfc_dev->gpiod_irq, 1);
if (ret) {
pr_err("%s : gpiod_direction_output failed\n", __func__);
ret = -ENODEV;
break;
}
gpiod_set_value(st21nfc_dev->gpiod_irq, 1);
usleep_range(10000, 11000);
gpiod_set_value(st21nfc_dev->gpiod_reset, 1);
pr_info("%s done Pulse Request\n", __func__);
}
msleep(20);
gpiod_set_value(st21nfc_dev->gpiod_irq, 0);
msleep(20);
gpiod_set_value(st21nfc_dev->gpiod_irq, 1);
msleep(20);
gpiod_set_value(st21nfc_dev->gpiod_irq, 0);
msleep(20);
pr_info("%s Recovery procedure finished\n", __func__);
ret = gpiod_direction_input(st21nfc_dev->gpiod_irq);
if (ret) {
pr_err("%s : gpiod_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_device *st21nfc_dev =
container_of(file->private_data, struct st21nfc_device, st21nfc_device);
unsigned int mask = 0;
int pinlev = 0;
/* wait for Wake_up_pin == high */
poll_wait(file, &st21nfc_dev->read_wq, wait);
pinlev = gpiod_get_value(st21nfc_dev->gpiod_irq);
if (pinlev != 0) {
if (enable_debug_log) pr_debug("%s return ready\n", __func__);
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_enable_irq(st21nfc_dev);
} else {
if (enable_debug_log) pr_debug("%s irq already enabled\n", __func__);
}
}
return mask;
}
#ifdef ST21NFCD_MTK
#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 */
#endif /* ST21NFCD_MTK */
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 scnprintf(buf, PAGE_SIZE, "0x%.2x\n", client->addr);
return -ENODEV;
} /* i2c_addr_show() */
static ssize_t i2c_addr_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count) {
struct st21nfc_device *data = dev_get_drvdata(dev);
long new_addr = 0;
if (data != NULL && data->client != NULL) {
if (!kstrtol(buf, 10, &new_addr)) {
mutex_lock(&data->read_mutex);
data->client->addr = new_addr;
mutex_unlock(&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 scnprintf(buf, PAGE_SIZE, "%s\n", DRIVER_VERSION);
} /* version_show */
static uint64_t st21nfc_power_duration(struct st21nfc_device *data,
enum st21nfc_power_state pstate,
uint64_t current_time_ms) {
return data->c_pw_current != pstate
? data->c_pw_states[pstate].duration
: data->c_pw_states[pstate].duration +
(current_time_ms - data->c_pw_states[pstate].last_entry);
}
static ssize_t power_stats_show(struct device *dev,
struct device_attribute *attr, char *buf) {
struct st21nfc_device *data = dev_get_drvdata(dev);
uint64_t current_time_ms;
uint64_t idle_duration;
uint64_t active_ce_duration;
uint64_t active_rw_duration;
mutex_lock(&data->pidle_mutex);
data->c_pw_current = data->pw_current;
data->c_pw_states_err = data->pw_states_err;
memcpy(data->c_pw_states, data->pw_states,
ST21NFC_POWER_STATE_MAX * sizeof(struct nfc_sub_power_stats));
mutex_unlock(&data->pidle_mutex);
current_time_ms = ktime_to_ms(ktime_get_boottime());
idle_duration = st21nfc_power_duration(data, ST21NFC_IDLE, current_time_ms);
active_ce_duration =
st21nfc_power_duration(data, ST21NFC_ACTIVE, current_time_ms);
active_rw_duration =
st21nfc_power_duration(data, ST21NFC_ACTIVE_RW, current_time_ms);
return scnprintf(
buf, PAGE_SIZE,
"NFC subsystem\n"
"Idle mode:\n"
"\tCumulative count: 0x%llx\n"
"\tCumulative duration msec: 0x%llx\n"
"\tLast entry timestamp msec: 0x%llx\n"
"\tLast exit timestamp msec: 0x%llx\n"
"Active mode:\n"
"\tCumulative count: 0x%llx\n"
"\tCumulative duration msec: 0x%llx\n"
"\tLast entry timestamp msec: 0x%llx\n"
"\tLast exit timestamp msec: 0x%llx\n"
"Active Reader/Writer mode:\n"
"\tCumulative count: 0x%llx\n"
"\tCumulative duration msec: 0x%llx\n"
"\tLast entry timestamp msec: 0x%llx\n"
"\tLast exit timestamp msec: 0x%llx\n"
"\nError transition header --> payload state machine: 0x%llx\n"
"Error transition from an Active state when not in Idle state: 0x%llx\n"
"Error transition from Idle state to Idle state: 0x%llx\n"
"Warning transition from Active Reader/Writer state to Idle state: "
"0x%llx\n"
"Error transition from Active state to Active state: 0x%llx\n"
"Error transition from Idle state to Active state with notification: "
"0x%llx\n"
"Error transition from Active Reader/Writer state to Active "
"Reader/Writer state: 0x%llx\n"
"Error transition from Idle state to Active Reader/Writer state with "
"notification: 0x%llx\n"
"\nTotal uptime: 0x%llx Cumulative modes time: 0x%llx\n",
data->c_pw_states[ST21NFC_IDLE].count, idle_duration,
data->c_pw_states[ST21NFC_IDLE].last_entry,
data->c_pw_states[ST21NFC_IDLE].last_exit,
data->c_pw_states[ST21NFC_ACTIVE].count, active_ce_duration,
data->c_pw_states[ST21NFC_ACTIVE].last_entry,
data->c_pw_states[ST21NFC_ACTIVE].last_exit,
data->c_pw_states[ST21NFC_ACTIVE_RW].count, active_rw_duration,
data->c_pw_states[ST21NFC_ACTIVE_RW].last_entry,
data->c_pw_states[ST21NFC_ACTIVE_RW].last_exit,
data->c_pw_states_err.header_payload,
data->c_pw_states_err.active_not_idle, data->c_pw_states_err.idle_to_idle,
data->c_pw_states_err.active_rw_to_idle,
data->c_pw_states_err.active_to_active,
data->c_pw_states_err.idle_to_active_ntf,
data->c_pw_states_err.act_rw_to_act_rw,
data->c_pw_states_err.idle_to_active_rw_ntf, current_time_ms,
idle_duration + active_ce_duration + active_rw_duration);
}
static DEVICE_ATTR_RW(i2c_addr);
static DEVICE_ATTR_RO(version);
static DEVICE_ATTR_RO(power_stats);
static struct attribute *st21nfc_attrs[] = {
&dev_attr_i2c_addr.attr,
&dev_attr_version.attr,
&dev_attr_power_stats.attr,
NULL,
};
static struct attribute_group st21nfc_attr_grp = {
.attrs = st21nfc_attrs,
};
#ifndef ST21NFCD_MTK
static const struct acpi_gpio_params irq_gpios = {0, 0, false};
static const struct acpi_gpio_params reset_gpios = {1, 0, false};
static const struct acpi_gpio_params pidle_gpios = {2, 0, false};
static const struct acpi_gpio_params clkreq_gpios = {3, 0, false};
static const struct acpi_gpio_mapping acpi_st21nfc_gpios[] = {
{"irq-gpios", &irq_gpios, 1},
{"reset-gpios", &reset_gpios, 1},
{"pidle-gpios", &pidle_gpios, 1},
{"clkreq-gpios", &clkreq_gpios, 1},
};
#endif
static int st21nfc_probe(struct i2c_client *client,
const struct i2c_device_id *id) {
int ret;
struct st21nfc_device *st21nfc_dev;
struct device *dev = &client->dev;
#ifdef ST21NFCD_MTK
int r;
struct device_node *np = dev->of_node;
#endif // ST21NFCD_MTK
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
pr_err("%s : need I2C_FUNC_I2C\n", __func__);
return -ENODEV;
}
st21nfc_dev = devm_kzalloc(dev, sizeof(*st21nfc_dev), GFP_KERNEL);
if (st21nfc_dev == NULL) return -ENOMEM;
#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 */
/* store for later use */
st21nfc_dev->client = client;
st21nfc_dev->r_state_current = ST21NFC_HEADER;
client->adapter->retries = 0;
#ifndef ST21NFCD_MTK
ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), acpi_st21nfc_gpios);
if (ret) pr_debug("Unable to add GPIO mapping table\n");
#else // ST21NFCD_MTK
np = of_find_compatible_node(NULL, NULL, "mediatek,nfc-gpio-v2");
if (!np) {
pr_err("%s : cannot find mediatek,nfc-gpio-v2 in DTS.\n", __func__);
return -ENODEV;
}
#endif // ST21NFCD_MTK
#ifndef ST21NFCD_MTK
st21nfc_dev->gpiod_irq = devm_gpiod_get(dev, "irq", GPIOD_IN);
#else // ST21NFCD_MTK
r = of_get_named_gpio(np, "gpio-irq-std", 0);
if (!gpio_is_valid(r)) {
pr_err("%s: get NFC IRQ GPIO failed (%d)", __FILE__, r);
return -ENODEV;
}
st21nfc_dev->gpiod_irq = gpio_to_desc(r);
ret = gpio_request(r,
#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__);
return -ENODEV;
}
pr_info("%s : IRQ GPIO = %d\n", __func__, r);
ret = gpio_direction_input(r);
if (ret) {
pr_err("%s : gpio_direction_input failed\n", __FILE__);
return -ENODEV;
}
#endif // ST21NFCD_MTK
if (IS_ERR_OR_NULL(st21nfc_dev->gpiod_irq)) {
pr_err("%s : Unable to request irq-gpios\n", __func__);
return -ENODEV;
}
#ifndef ST21NFCD_MTK
st21nfc_dev->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
#else // ST21NFCD_MTK
r = of_get_named_gpio(np, "gpio-rst-std", 0);
if (!gpio_is_valid(r)) {
pr_err("%s: get NFC RST GPIO failed (%d)", __FILE__, r);
return -ENODEV;
}
st21nfc_dev->gpiod_reset = gpio_to_desc(r);
ret = gpio_request(r,
#if (!defined(CONFIG_MTK_GPIO) || defined(CONFIG_MTK_GPIOLIB_STAND))
"gpio-rst-std"
#else
"gpio-rst"
#endif
);
if (ret) {
pr_err("%s : gpio_request failed\n", __FILE__);
return -ENODEV;
}
pr_info("%s : RST GPIO = %d\n", __func__, r);
ret = gpio_direction_output(r, 1);
if (ret) {
pr_err("%s : gpio_direction_output failed\n", __FILE__);
return -ENODEV;
}
gpio_set_value(r, 1);
#endif // ST21NFCD_MTK
if (IS_ERR_OR_NULL(st21nfc_dev->gpiod_reset)) {
pr_warn("%s : Unable to request reset-gpios\n", __func__);
return -ENODEV;
}
#ifndef ST21NFCD_MTK
st21nfc_dev->gpiod_pidle = devm_gpiod_get(dev, "pidle", GPIOD_IN);
#else // ST21NFCD_MTK
ret = of_get_named_gpio(np, "gpio-pidle-std", 0);
if (gpio_is_valid(ret)) {
st21nfc_dev->gpiod_pidle = gpio_to_desc(ret);
}
#endif // ST21NFCD_MTK
if (IS_ERR_OR_NULL(st21nfc_dev->gpiod_pidle)) {
pr_warn("[OPTIONAL] %s: Unable to request pidle-gpio\n", __func__);
ret = 0;
} else {
/* Start the power stat in power mode idle */
st21nfc_dev->irq_pw_stats_idle = gpiod_to_irq(st21nfc_dev->gpiod_pidle);
ret = irq_set_irq_type(st21nfc_dev->irq_pw_stats_idle, IRQ_TYPE_EDGE_BOTH);
if (ret) {
pr_err("%s : set_irq_type failed\n", __func__);
return ret;
}
/* This next call requests an interrupt line */
ret = devm_request_irq(dev, st21nfc_dev->irq_pw_stats_idle,
(irq_handler_t)st21nfc_dev_power_stats_handler,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
/* Interrupt on both edges */
"st21nfc_pw_stats_idle_handle", st21nfc_dev);
if (ret) {
pr_err("%s : devm_request_irq for power stats idle failed\n", __func__);
return ret;
}
ret = sysfs_create_file(&dev->kobj, &dev_attr_power_stats.attr);
if (ret) {
pr_err("%s : sysfs_create_file for power stats failed\n", __func__);
return ret;
}
mutex_init(&st21nfc_dev->pidle_mutex);
st21nfc_dev->st_p_wq = create_workqueue("st_pstate_work");
INIT_WORK(&(st21nfc_dev->st_p_work), st21nfc_pstate_wq);
}
#ifndef ST21NFCD_MTK
st21nfc_dev->gpiod_clkreq = devm_gpiod_get(dev, "clkreq", GPIOD_IN);
if (IS_ERR_OR_NULL(st21nfc_dev->gpiod_clkreq)) {
pr_warn("[OPTIONAL] %s : Unable to request clkreq-gpios\n", __func__);
ret = 0;
} else {
if (!device_property_read_bool(dev, "st,clk_pinctrl")) {
pr_debug("[dsc]%s:[OPTIONAL] clk_pinctrl not set\n", __func__);
st21nfc_dev->pinctrl_en = 0;
} else {
pr_debug("[dsc]%s:[OPTIONAL] clk_pinctrl set\n", __func__);
st21nfc_dev->pinctrl_en = 1;
}
/* Set clk_run when clock pinctrl already enabled */
if (st21nfc_dev->pinctrl_en != 0) st21nfc_dev->clk_run = true;
ret = st21nfc_clock_select(st21nfc_dev);
if (ret < 0) {
pr_err("%s : st21nfc_clock_select failed\n", __func__);
goto err_sysfs_power_stats;
}
}
#else // ST21NFCD_MTK
ret = st21nfc_clock_select(st21nfc_dev);
if (ret < 0) {
pr_err("%s : st21nfc_clock_select failed\n", __func__);
goto err_sysfs_power_stats;
}
#endif // ST21NFCD_MTK
#ifndef ST21NFCD_MTK
client->irq = gpiod_to_irq(st21nfc_dev->gpiod_irq);
#else // ST21NFCD_MTK
np = of_find_compatible_node(NULL, NULL, "mediatek,irq_nfc-eint");
if (np) {
client->irq = irq_of_parse_and_map(np, 0);
pr_info("%s : MT IRQ GPIO = %d\n", __func__, client->irq);
}
#endif // ST21NFCD_MTK
/* init mutex and queues */
init_waitqueue_head(&st21nfc_dev->read_wq);
mutex_init(&st21nfc_dev->read_mutex);
spin_lock_init(&st21nfc_dev->irq_enabled_lock);
pr_debug(
"%s : debug irq_gpio = %d, client-irq = %d, pidle_gpio = %d\n", __func__,
IS_ERR_OR_NULL(st21nfc_dev->gpiod_irq) ? -1 : desc_to_gpio(st21nfc_dev->gpiod_irq),
client->irq,
IS_ERR_OR_NULL(st21nfc_dev->gpiod_pidle) ? -1 : desc_to_gpio(st21nfc_dev->gpiod_pidle));
st21nfc_dev->st21nfc_device.minor = MISC_DYNAMIC_MINOR;
st21nfc_dev->st21nfc_device.name = "st21nfc";
st21nfc_dev->st21nfc_device.fops = &st21nfc_dev_fops;
st21nfc_dev->st21nfc_device.parent = dev;
i2c_set_clientdata(client, st21nfc_dev);
ret = misc_register(&st21nfc_dev->st21nfc_device);
if (ret) {
pr_err("%s : misc_register failed\n", __func__);
goto err_misc_register;
}
ret = sysfs_create_group(&dev->kobj, &st21nfc_attr_grp);
if (ret) {
pr_err("%s : sysfs_create_group failed\n", __func__);
goto err_sysfs_create_group_failed;
}
device_init_wakeup(&client->dev, true);
device_set_wakeup_capable(&client->dev, true);
st21nfc_dev->irq_wake_up = false;
return 0;
err_sysfs_create_group_failed:
misc_deregister(&st21nfc_dev->st21nfc_device);
err_misc_register:
mutex_destroy(&st21nfc_dev->read_mutex);
err_sysfs_power_stats:
if (!IS_ERR_OR_NULL(st21nfc_dev->gpiod_pidle)) {
sysfs_remove_file(&client->dev.kobj, &dev_attr_power_stats.attr);
mutex_destroy(&st21nfc_dev->pidle_mutex);
}
return ret;
}
static int st21nfc_remove(struct i2c_client *client) {
struct st21nfc_device *st21nfc_dev = i2c_get_clientdata(client);
#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_clock_deselect(st21nfc_dev);
misc_deregister(&st21nfc_dev->st21nfc_device);
if (!IS_ERR_OR_NULL(st21nfc_dev->gpiod_pidle)) {
sysfs_remove_file(&client->dev.kobj, &dev_attr_power_stats.attr);
mutex_destroy(&st21nfc_dev->pidle_mutex);
}
sysfs_remove_group(&client->dev.kobj, &st21nfc_attr_grp);
mutex_destroy(&st21nfc_dev->read_mutex);
acpi_dev_remove_driver_gpios(ACPI_COMPANION(&client->dev));
return 0;
}
static int st21nfc_suspend(struct device *device) {
struct i2c_client *client = to_i2c_client(device);
struct st21nfc_device *st21nfc_dev = i2c_get_clientdata(client);
if (device_may_wakeup(&client->dev) && st21nfc_dev->irq_enabled) {
if (!enable_irq_wake(client->irq)) st21nfc_dev->irq_wake_up = true;
}
if (!IS_ERR_OR_NULL(st21nfc_dev->gpiod_pidle)) {
st21nfc_dev->p_idle_last = gpiod_get_value(st21nfc_dev->gpiod_pidle);
}
return 0;
}
static int st21nfc_resume(struct device *device) {
struct i2c_client *client = to_i2c_client(device);
struct st21nfc_device *st21nfc_dev = i2c_get_clientdata(client);
int pidle;
if (device_may_wakeup(&client->dev) && st21nfc_dev->irq_wake_up) {
if (!disable_irq_wake(client->irq)) st21nfc_dev->irq_wake_up = false;
}
if (!IS_ERR_OR_NULL(st21nfc_dev->gpiod_pidle)) {
pidle = gpiod_get_value(st21nfc_dev->gpiod_pidle);
if ((st21nfc_dev->p_idle_last != pidle) ||
(st21nfc_dev->pw_current == ST21NFC_IDLE && pidle != 0) ||
(st21nfc_dev->pw_current == ST21NFC_ACTIVE && pidle == 0)) {
queue_work(st21nfc_dev->st_p_wq, &(st21nfc_dev->st_p_work));
}
}
return 0;
}
static const struct i2c_device_id st21nfc_id[] = {{"st21nfc", 0}, {}};
static const struct of_device_id st21nfc_of_match[] = {
#ifndef ST21NFCD_MTK
{
.compatible = "st,st21nfc",
},
#else
{.compatible = "mediatek,nfc"},
#endif
{}};
MODULE_DEVICE_TABLE(of, st21nfc_of_match);
static const struct dev_pm_ops st21nfc_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(st21nfc_suspend, st21nfc_resume)};
#ifndef ST21NFCD_MTK
static const struct acpi_device_id st21nfc_acpi_match[] = {{"SMO2104"}, {}};
MODULE_DEVICE_TABLE(acpi, st21nfc_acpi_match);
#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,
.of_match_table = st21nfc_of_match,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.pm = &st21nfc_pm_ops,
#ifndef ST21NFCD_MTK
.acpi_match_table = ACPI_PTR(st21nfc_acpi_match),
#endif
},
};
#ifdef ST21NFCD_MTK
#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,
.of_match_table = nfc_dev_of_match,
},
};
#endif /* KRNMTKLEGACY_GPIO */
#endif /* ST21NFCD_MTK */
/* module load/unload record keeping */
static int __init st21nfc_dev_init(void) {
pr_info("Loading st21nfc driver\n");
#ifdef ST21NFCD_MTK
#ifndef KRNMTKLEGACY_GPIO
platform_driver_register(&st21nfc_platform_driver);
if (enable_debug_log) pr_debug("Loading st21nfc i2c driver\n");
#endif
#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("STMicroelectronics");
MODULE_DESCRIPTION("NFC ST21NFC driver");
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL");