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gerrit-public.fairphone.software / kernel / msm / 73e5b58f2e961941223311ef95ffabb06f4c47e8 / . / drivers / nfc / nfc-nci.c
blob: b1681f14eeae9dc74334a65b337eb38de7e11340 [file] [log] [blame]
/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/spinlock.h>
#include <linux/poll.h>
#include <linux/of_gpio.h>
#include <linux/clk.h>
#include <linux/of_device.h>
#include <linux/regulator/consumer.h>
#include "nfc-nci.h"
#include <mach/gpiomux.h>
#include <linux/pm_runtime.h>
struct qca199x_platform_data {
unsigned int irq_gpio;
unsigned int irq_gpio_clk_req;
unsigned int clk_req_irq_num;
unsigned int dis_gpio;
unsigned int clkreq_gpio;
unsigned int reg;
const char *clk_src_name;
unsigned int clk_src_gpio;
};
static struct of_device_id msm_match_table[] = {
{.compatible = "qcom,nfc-nci"},
{}
};
MODULE_DEVICE_TABLE(of, msm_match_table);
#define MAX_BUFFER_SIZE (780)
#define PACKET_MAX_LENGTH (258)
/* Read data */
#define PACKET_HEADER_SIZE_NCI (4)
#define PACKET_TYPE_NCI (16)
#define MAX_PACKET_SIZE (PACKET_HEADER_SIZE_NCI + 255)
#define MAX_QCA_REG (116)
/* will timeout in approx. 100ms as 10us steps */
#define NFC_RF_CLK_FREQ (19200000)
#define NTF_TIMEOUT (25)
#define CORE_RESET_RSP_GID (0x60)
#define CORE_RESET_OID (0x00)
#define CORE_RST_NTF_LENGTH (0x02)
#define WAKE_TIMEOUT (1000)
#define WAKE_REG (0x10)
#define EFUSE_REG (0xA0)
#define WAKEUP_SRC_TIMEOUT (2000)
static void clk_req_update(struct work_struct *work);
struct qca199x_dev {
wait_queue_head_t read_wq;
struct mutex read_mutex;
struct i2c_client *client;
struct miscdevice qca199x_device;
/* NFC_IRQ new NCI data available */
unsigned int irq_gpio;
/* CLK_REQ IRQ to signal the state has changed */
unsigned int irq_gpio_clk_req;
/* Actual IRQ no. assigned to CLK_REQ */
unsigned int clk_req_irq_num;
unsigned int dis_gpio;
unsigned int clkreq_gpio;
/* NFC_IRQ state */
bool irq_enabled;
bool sent_first_nci_write;
spinlock_t irq_enabled_lock;
unsigned int count_irq;
/* CLK_REQ IRQ state */
bool irq_enabled_clk_req;
spinlock_t irq_enabled_lock_clk_req;
unsigned int count_irq_clk_req;
enum nfcc_state state;
/* CLK control */
unsigned int clk_src_gpio;
const char *clk_src_name;
struct clk *s_clk;
unsigned int core_reset_ntf;
bool clk_run;
struct work_struct msm_clock_controll_work;
struct workqueue_struct *my_wq;
};
static int nfcc_reboot(struct notifier_block *notifier, unsigned long val,
void *v);
static int nfc_i2c_write(struct i2c_client *client, u8 *buf, int len);
static int nfcc_hw_check(struct i2c_client *client, unsigned short curr_addr);
static int nfcc_initialise(struct i2c_client *client, unsigned short curr_addr,
struct qca199x_dev *qca199x_dev);
static int qca199x_clock_select(struct qca199x_dev *qca199x_dev);
static int qca199x_clock_deselect(struct qca199x_dev *qca199x_dev);
/*
* To allow filtering of nfc logging from user. This is set via
* IOCTL NFC_KERNEL_LOGGING_MODE.
*/
static int logging_level;
/*
* FTM-RAW-I2C RD/WR MODE
*/
static struct devicemode device_mode;
static int ftm_raw_write_mode;
static int ftm_werr_code;
unsigned int disable_ctrl;
bool region2_sent;
static void qca199x_init_stat(struct qca199x_dev *qca199x_dev)
{
qca199x_dev->count_irq = 0;
}
static void qca199x_disable_irq(struct qca199x_dev *qca199x_dev)
{
unsigned long flags;
spin_lock_irqsave(&qca199x_dev->irq_enabled_lock, flags);
if (qca199x_dev->irq_enabled) {
disable_irq_nosync(qca199x_dev->client->irq);
qca199x_dev->irq_enabled = false;
}
spin_unlock_irqrestore(&qca199x_dev->irq_enabled_lock, flags);
}
static void qca199x_enable_irq(struct qca199x_dev *qca199x_dev)
{
unsigned long flags;
spin_lock_irqsave(&qca199x_dev->irq_enabled_lock, flags);
if (!qca199x_dev->irq_enabled) {
qca199x_dev->irq_enabled = true;
enable_irq(qca199x_dev->client->irq);
}
spin_unlock_irqrestore(&qca199x_dev->irq_enabled_lock, flags);
}
static irqreturn_t qca199x_dev_irq_handler(int irq, void *dev_id)
{
struct qca199x_dev *qca199x_dev = dev_id;
unsigned long flags;
if (device_may_wakeup(&qca199x_dev->client->dev) &&
(qca199x_dev->client->dev.power.is_suspended == true)) {
dev_dbg(&qca199x_dev->client->dev,
"%s: NFC:Processor in suspend state device_may_wakeup\n",
__func__);
/*
* Keep system awake long enough to allow userspace
* to process the packet.
*/
pm_wakeup_event(&qca199x_dev->client->dev, WAKEUP_SRC_TIMEOUT);
} else {
dev_dbg(&qca199x_dev->client->dev,
"%s: NFC:Processor not in suspend state\n", __func__);
}
spin_lock_irqsave(&qca199x_dev->irq_enabled_lock, flags);
qca199x_dev->count_irq++;
spin_unlock_irqrestore(&qca199x_dev->irq_enabled_lock, flags);
wake_up(&qca199x_dev->read_wq);
return IRQ_HANDLED;
}
static unsigned int nfc_poll(struct file *filp, poll_table *wait)
{
struct qca199x_dev *qca199x_dev = filp->private_data;
unsigned int mask = 0;
unsigned long flags;
poll_wait(filp, &qca199x_dev->read_wq, wait);
spin_lock_irqsave(&qca199x_dev->irq_enabled_lock, flags);
if (qca199x_dev->count_irq > 0) {
qca199x_dev->count_irq--;
mask |= POLLIN | POLLRDNORM;
}
spin_unlock_irqrestore(&qca199x_dev->irq_enabled_lock, flags);
return mask;
}
/* Handlers for CLK_REQ */
static void qca199x_disable_irq_clk_req(struct qca199x_dev *qca199x_dev)
{
unsigned long flags;
spin_lock_irqsave(&qca199x_dev->irq_enabled_lock_clk_req, flags);
if (qca199x_dev->irq_enabled_clk_req) {
disable_irq_nosync(qca199x_dev->clk_req_irq_num);
qca199x_dev->irq_enabled_clk_req = false;
}
spin_unlock_irqrestore(&qca199x_dev->irq_enabled_lock_clk_req, flags);
}
static void qca199x_enable_irq_clk_req(struct qca199x_dev *qca199x_dev)
{
unsigned long flags;
spin_lock_irqsave(&qca199x_dev->irq_enabled_lock_clk_req, flags);
if (!qca199x_dev->irq_enabled_clk_req) {
qca199x_dev->irq_enabled_clk_req = true;
enable_irq(qca199x_dev->clk_req_irq_num);
}
spin_unlock_irqrestore(&qca199x_dev->irq_enabled_lock_clk_req, flags);
}
static irqreturn_t qca199x_dev_irq_handler_clk_req(int irq, void *dev_id)
{
struct qca199x_dev *qca199x_dev = dev_id;
unsigned long flags;
spin_lock_irqsave(&qca199x_dev->irq_enabled_lock_clk_req, flags);
qca199x_dev->count_irq_clk_req++;
spin_unlock_irqrestore(&qca199x_dev->irq_enabled_lock_clk_req, flags);
queue_work(qca199x_dev->my_wq, &qca199x_dev->msm_clock_controll_work);
return IRQ_HANDLED;
}
static struct gpiomux_setting nfc_clk_on = {
.func = GPIOMUX_FUNC_2,
.drv = GPIOMUX_DRV_2MA,
.pull = GPIOMUX_PULL_NONE,
};
static struct gpiomux_setting nfc_clk_on_suspend = {
.func = GPIOMUX_FUNC_2,
.drv = GPIOMUX_DRV_2MA,
.pull = GPIOMUX_PULL_DOWN,
};
static struct gpiomux_setting nfc_clk_off = {
.func = GPIOMUX_FUNC_GPIO,
.drv = GPIOMUX_DRV_2MA,
.pull = GPIOMUX_PULL_DOWN,
};
static void clk_req_update(struct work_struct *work)
{
struct i2c_client *client;
struct qca199x_dev *qca199x_dev;
int gpio_clk_req_level = 0;
qca199x_dev = container_of(work, struct qca199x_dev,
msm_clock_controll_work);
client = qca199x_dev->client;
/* Read status level of CLK_REQ from NFC Controller, QCA199_x */
gpio_clk_req_level = gpio_get_value(qca199x_dev->irq_gpio_clk_req);
if (gpio_clk_req_level == 1) {
if (qca199x_dev->clk_run == false) {
msm_gpiomux_write(qca199x_dev->clk_src_gpio,
GPIOMUX_ACTIVE, &nfc_clk_on, NULL);
msm_gpiomux_write(qca199x_dev->clk_src_gpio,
GPIOMUX_SUSPENDED, &nfc_clk_on_suspend, NULL);
qca199x_dev->clk_run = true;
}
} else{
if (qca199x_dev->clk_run == true) {
msm_gpiomux_write(qca199x_dev->clk_src_gpio,
GPIOMUX_ACTIVE, &nfc_clk_off, NULL);
msm_gpiomux_write(qca199x_dev->clk_src_gpio,
GPIOMUX_SUSPENDED, &nfc_clk_off, NULL);
qca199x_dev->clk_run = false;
}
}
}
/*
* ONLY for FTM-RAW-I2C Mode
* Required to instigate a read, which comes from DT layer. This means we need
* to spoof an interrupt and send a wake up event.
*/
void ftm_raw_trigger_read(struct qca199x_dev *qca199x_dev)
{
unsigned long flags;
spin_lock_irqsave(&qca199x_dev->irq_enabled_lock, flags);
qca199x_dev->count_irq++;
spin_unlock_irqrestore(&qca199x_dev->irq_enabled_lock, flags);
wake_up(&qca199x_dev->read_wq);
}
static ssize_t nfc_read(struct file *filp, char __user *buf,
size_t count, loff_t *offset)
{
struct qca199x_dev *qca199x_dev = filp->private_data;
unsigned char tmp[MAX_BUFFER_SIZE], rd_byte;
unsigned char len[PAYLOAD_HEADER_LENGTH];
int total, length, ret;
int ftm_rerr_code;
enum ehandler_mode dmode;
total = 0;
length = 0;
if (count > MAX_BUFFER_SIZE)
count = MAX_BUFFER_SIZE;
mutex_lock(&qca199x_dev->read_mutex);
memset(tmp, 0, sizeof(tmp));
memset(len, 0, sizeof(len));
dmode = device_mode.handle_flavour;
/* FTM-RAW-I2C RD/WR MODE - Special Case */
if ((dmode == UNSOLICITED_FTM_RAW_MODE) ||
(dmode == SOLICITED_FTM_RAW_MODE)) {
/* READ */
if ((ftm_raw_write_mode == 0) && (ftm_werr_code == 0)) {
ftm_rerr_code = i2c_master_recv(qca199x_dev->client,
&rd_byte, sizeof(rd_byte));
if (ftm_rerr_code != sizeof(rd_byte)) {
total = -EMSGSIZE;
goto err;
}
if (ftm_rerr_code == 0x1)
ftm_rerr_code = 0;
tmp[0] = (unsigned char)ftm_rerr_code;
tmp[1] = rd_byte;
total = 2;
ret = copy_to_user(buf, tmp, total);
}
/* WRITE */
else if ((ftm_raw_write_mode == 1) || (ftm_werr_code != 0)) {
tmp[0] = (unsigned char)ftm_werr_code;
total = 1;
ret = copy_to_user(buf, tmp, total);
} else {
/* Invalid case */
total = 0;
ret = copy_to_user(buf, tmp, total);
}
mutex_unlock(&qca199x_dev->read_mutex);
goto done;
}
/* NORMAL NCI Behaviour */
/* Read the header */
ret = i2c_master_recv(qca199x_dev->client, len, PAYLOAD_HEADER_LENGTH);
/*
* We ignore all packets of length PAYLOAD_HEADER_LENGTH
* or less (i.e <=3). In this case return a total length
* of ZERO. So ALL PACKETS MUST HAVE A PAYLOAD.
* If ret < 0 then this is an error code.
*/
if (ret != PAYLOAD_HEADER_LENGTH) {
if (ret < 0)
total = ret;
else
total = 0;
goto err;
}
length = len[PAYLOAD_HEADER_LENGTH - 1];
if (length == 0) {
ret = 0;
total = ret;
goto err;
}
/** make sure full packet fits in the buffer **/
if ((length > 0) && ((length + PAYLOAD_HEADER_LENGTH) <= count)) {
/* Read the packet */
ret = i2c_master_recv(qca199x_dev->client, tmp, (length +
PAYLOAD_HEADER_LENGTH));
total = ret;
if (ret < 0)
goto err;
}
dev_dbg(&qca199x_dev->client->dev, "%s : NfcNciRx %x %x %x\n",
__func__, tmp[0], tmp[1], tmp[2]);
if (total > 0) {
if ((total > count) || copy_to_user(buf, tmp, total)) {
dev_err(&qca199x_dev->client->dev,
"%s: failed to copy to user space, total = %d\n",
__func__, total);
total = -EFAULT;
}
}
err:
mutex_unlock(&qca199x_dev->read_mutex);
done:
return total;
}
/*
* Local routine to read from nfcc buffer. This is called to clear any
* pending receive messages in the nfcc's read buffer, which may be there
* following a POR. In this way, the upper layers (Device Transport) will
* associate the next rsp/ntf nci message with the next nci command to the
* nfcc. Otherwise, the DT may interpret a ntf from the nfcc as being from
* the nci core reset command when in fact it was already present in the
* nfcc read buffer following a POR.
*/
int nfcc_read_buff_svc(struct qca199x_dev *qca199x_dev)
{
unsigned char tmp[PACKET_MAX_LENGTH];
unsigned char len[PAYLOAD_HEADER_LENGTH];
int total, length, ret;
total = 0;
length = 0;
mutex_lock(&qca199x_dev->read_mutex);
memset(tmp, 0, sizeof(tmp));
memset(len, 0, sizeof(len));
/* Read the header */
ret = i2c_master_recv(qca199x_dev->client, len, PAYLOAD_HEADER_LENGTH);
if (ret < PAYLOAD_HEADER_LENGTH) {
total = ret;
goto leave;
}
length = len[PAYLOAD_HEADER_LENGTH - 1];
if (length == 0) {
ret = PAYLOAD_HEADER_LENGTH;
total = ret;
goto leave;
}
/** make sure full packet fits in the buffer **/
if ((length > 0) && ((length + PAYLOAD_HEADER_LENGTH) <= PACKET_MAX_LENGTH)) {
/* Read the packet */
ret = i2c_master_recv(qca199x_dev->client, tmp, (length +
PAYLOAD_HEADER_LENGTH));
total = ret;
if (ret != (length + PAYLOAD_HEADER_LENGTH))
goto leave;
}
dev_dbg(&qca199x_dev->client->dev, "%s : NfcNciRx %x %x %x\n",
__func__, tmp[0], tmp[1], tmp[2]);
leave:
mutex_unlock(&qca199x_dev->read_mutex);
return total;
}
static ssize_t nfc_write(struct file *filp, const char __user *buf,
size_t count, loff_t *offset)
{
struct qca199x_dev *qca199x_dev = filp->private_data;
char tmp[MAX_BUFFER_SIZE];
int ret = 0;
enum ehandler_mode dmode;
int nfcc_buffer = 0;
if (count > MAX_BUFFER_SIZE) {
dev_err(&qca199x_dev->client->dev, "%s: out of memory\n",
__func__);
return -ENOMEM;
}
if (copy_from_user(tmp, buf, count)) {
dev_err(&qca199x_dev->client->dev,
"%s: failed to copy from user space\n", __func__);
return -EFAULT;
}
/*
* A catch for when the DT is sending the initial NCI write
* following a hardware POR. In this case we should clear any
* pending messages in nfcc buffer and open the interrupt gate
* for new messages coming from the nfcc.
*/
if ((qca199x_dev->sent_first_nci_write == false) &&
(qca199x_dev->irq_enabled == false)) {
/* check rsp/ntf from nfcc read-side buffer */
nfcc_buffer = nfcc_read_buff_svc(qca199x_dev);
/* There has been an error while reading from nfcc */
if (nfcc_buffer < 0) {
dev_err(&qca199x_dev->client->dev,
"%s: error while servicing nfcc read buffer\n"
, __func__);
}
qca199x_dev->sent_first_nci_write = true;
qca199x_enable_irq(qca199x_dev);
}
mutex_lock(&qca199x_dev->read_mutex);
dmode = device_mode.handle_flavour;
/* FTM-DIRECT-I2C RD/WR MODE */
/* This is a special FTM-i2c mode case, where tester is not using NCI */
if ((dmode == UNSOLICITED_FTM_RAW_MODE) ||
(dmode == SOLICITED_FTM_RAW_MODE)) {
/* Read From Register */
if (count == 1) {
ftm_raw_write_mode = 0;
ret = i2c_master_send(qca199x_dev->client, tmp, count);
if (ret == count)
ftm_werr_code = 0;
else
ftm_werr_code = ret;
ftm_raw_trigger_read(qca199x_dev);
}
/* Write to Register */
if (count == 2) {
ftm_raw_write_mode = 1;
ret = i2c_master_send(qca199x_dev->client, tmp, count);
if (ret == count)
ftm_werr_code = 0;
else
ftm_werr_code = ret;
ftm_raw_trigger_read(qca199x_dev);
}
} else {
/* NORMAL NCI behaviour - NB :
We can be in FTM mode here also */
ret = i2c_master_send(qca199x_dev->client, tmp, count);
}
if (ret != count) {
dev_err(&qca199x_dev->client->dev,
"%s: failed to write %d\n", __func__, ret);
ret = -EIO;
}
mutex_unlock(&qca199x_dev->read_mutex);
/* If we detect a Region2 command prior to power-down */
if ((tmp[0] == 0x2F) && (tmp[1] == 0x01) && (tmp[2] == 0x02) &&
(tmp[3] == 0x08) && (tmp[4] == 0x00)) {
region2_sent = true;
}
dev_dbg(&qca199x_dev->client->dev, "%s : NfcNciTx %x %x %x\n",
__func__, tmp[0], tmp[1], tmp[2]);
return ret;
}
static int nfc_open(struct inode *inode, struct file *filp)
{
int ret = 0;
struct qca199x_dev *qca199x_dev = container_of(filp->private_data,
struct qca199x_dev,
qca199x_device);
filp->private_data = qca199x_dev;
qca199x_init_stat(qca199x_dev);
/* Enable interrupts from NFCC NFC_INT new NCI data available */
qca199x_enable_irq(qca199x_dev);
if ((!strcmp(qca199x_dev->clk_src_name, "GPCLK")) ||
(!strcmp(qca199x_dev->clk_src_name, "GPCLK2"))) {
/* Enable interrupts from NFCC CLK_REQ */
qca199x_enable_irq_clk_req(qca199x_dev);
}
dev_dbg(&qca199x_dev->client->dev,
"%s: %d,%d\n", __func__, imajor(inode), iminor(inode));
return ret;
}
/*
* Wake/Sleep Mode
*/
int nfcc_wake(int level, struct file *filp)
{
int r = 0;
int time_taken = 0;
unsigned char raw_nci_sleep[] = {0x2F, 0x03, 0x00};
unsigned char raw_nci_wake[] = {0x10, 0x0F};
/* Change slave address to 0xE */
unsigned short slave_addr = 0xE;
unsigned short curr_addr;
unsigned char wake_status = WAKE_REG;
struct qca199x_dev *qca199x_dev = filp->private_data;
dev_dbg(&qca199x_dev->client->dev, "%s: info: %p\n",
__func__, qca199x_dev);
curr_addr = qca199x_dev->client->addr;
if (level == NFCC_SLEEP) {
/*
* Normal NCI write
*/
r = i2c_master_send(qca199x_dev->client, &raw_nci_sleep[0],
sizeof(raw_nci_sleep));
if (r != sizeof(raw_nci_sleep))
return -EMSGSIZE;
qca199x_dev->state = NFCC_STATE_NORMAL_SLEEP;
} else {
qca199x_dev->client->addr = slave_addr;
r = nfc_i2c_write(qca199x_dev->client, &raw_nci_wake[0],
sizeof(raw_nci_wake));
if (r != sizeof(raw_nci_wake)) {
r = -EMSGSIZE;
dev_err(&qca199x_dev->client->dev,
"%s: nci wake write failed. Check hardware\n",
__func__);
goto leave;
}
do {
wake_status = WAKE_REG;
r = nfc_i2c_write(qca199x_dev->client, &wake_status,
sizeof(wake_status));
if (r != sizeof(wake_status)) {
r = -EMSGSIZE;
dev_err(&qca199x_dev->client->dev,
"%s: wake status write fail.Check hardware\n",
__func__);
goto leave;
}
/*
* I2C line is low after ~10 usec
*/
usleep_range(10, 15);
r = i2c_master_recv(qca199x_dev->client, &wake_status,
sizeof(wake_status));
if (r != sizeof(wake_status)) {
r = -EMSGSIZE;
dev_err(&qca199x_dev->client->dev,
"%s: wake status read fail.Check hardware\n",
__func__);
goto leave;
}
time_taken++;
/*
* Each NFCC wakeup cycle
* takes about 0.5 ms
*/
if ((wake_status & NCI_WAKE) != 0)
/* NFCC wakeup time is between 0.5 and .52 ms */
usleep_range(500, 550);
} while ((wake_status & NCI_WAKE)
&& (time_taken < WAKE_TIMEOUT));
if (time_taken >= WAKE_TIMEOUT) {
dev_err(&qca199x_dev->client->dev,
"%s: timed out to get wakeup bit\n", __func__);
r = -EIO;
goto leave;
}
r = 0;
qca199x_dev->state = NFCC_STATE_NORMAL_WAKE;
}
leave:
/* Restore original NFCC slave I2C address */
qca199x_dev->client->addr = curr_addr;
return r;
}
/*
* Inside nfc_ioctl_power_states
*
* @brief ioctl functions
*
*
* Device control
* remove control via ioctl
* (arg = 0): NFC_DISABLE GPIO = 0
* (arg = 1): NFC_DISABLE GPIO = 1
* NOT USED (arg = 2): FW_DL GPIO = 0
* NOT USED (arg = 3): FW_DL GPIO = 1
* (arg = 4): NFCC_WAKE = 1
* (arg = 5): NFCC_WAKE = 0
*
*
*/
int nfc_ioctl_power_states(struct file *filp, unsigned int cmd,
unsigned long arg)
{
int r = 0;
struct qca199x_dev *qca199x_dev = filp->private_data;
if (arg == 0) {
r = qca199x_clock_select(qca199x_dev);
if (r < 0)
goto err_req;
dev_dbg(&qca199x_dev->client->dev, "gpio_set_value disable: %s: info: %p\n",
__func__, qca199x_dev);
gpio_set_value(qca199x_dev->dis_gpio, 0);
usleep_range(1000, 1100);
} else if (arg == 1) {
/*
* We are attempting a hardware reset so let us disable
* interrupts to avoid spurious notifications to upper
* layers.
*/
qca199x_disable_irq(qca199x_dev);
/* Deselection of clock */
r = qca199x_clock_deselect(qca199x_dev);
if (r < 0)
goto err_req;
/*
* Also, set flag for initial NCI write following resetas
* may wish to do some house keeping. Ensure no pending
* messages in NFCC buffers which may be wrongly
* construed as response to initial message
*/
qca199x_dev->sent_first_nci_write = false;
dev_dbg(&qca199x_dev->client->dev, "gpio_set_value enable: %s: info: %p\n",
__func__, qca199x_dev);
gpio_set_value(qca199x_dev->dis_gpio, 1);
/* NFCC needs at least 100 ms to power cycle*/
msleep(100);
} else if (arg == 2) {
mutex_lock(&qca199x_dev->read_mutex);
dev_dbg(&qca199x_dev->client->dev, "before nfcc_initialise: %s: info: %p\n",
__func__, qca199x_dev);
r = nfcc_initialise(qca199x_dev->client, 0xE, qca199x_dev);
dev_dbg(&qca199x_dev->client->dev, "after nfcc_initialise: %s: info: %p\n",
__func__, qca199x_dev);
/* Also reset first NCI write */
qca199x_dev->sent_first_nci_write = false;
mutex_unlock(&qca199x_dev->read_mutex);
if (r) {
dev_err(&qca199x_dev->client->dev,
"nfc_ioctl_power_states: request nfcc initialise failed\n");
goto err_req;
}
} else if (arg == 3) {
msleep(20);
} else if (arg == 4) {
mutex_lock(&qca199x_dev->read_mutex);
r = nfcc_wake(NFCC_WAKE, filp);
dev_dbg(&qca199x_dev->client->dev, "nfcc wake: %s: info: %p\n",
__func__, qca199x_dev);
mutex_unlock(&qca199x_dev->read_mutex);
} else if (arg == 5) {
r = nfcc_wake(NFCC_SLEEP, filp);
} else {
r = -ENOIOCTLCMD;
}
err_req:
return r;
}
/*
* Inside nfc_ioctl_nfcc_mode
*
* @brief nfc_ioctl_nfcc_mode
*
* (arg = 0) ; NORMAL_MODE - Standard mode, unsolicited read behaviour
* (arg = 1) ; SOLICITED_MODE - As above but reads are solicited from User Land
* (arg = 2) ; UNSOLICITED_FTM_RAW MODE - NORMAL_MODE but messages from FTM and
* not NCI Host.
* (arg = 2) ; SOLICITED_FTM_RAW_MODE - As SOLICITED_MODE but messages from FTM
* and not NCI Host.
*
*
*
*/
int nfc_ioctl_nfcc_mode(struct file *filp, unsigned int cmd, unsigned long arg)
{
int retval = 0;
static unsigned short nci_addr;
struct qca199x_dev *qca199x_dev = filp->private_data;
struct qca199x_platform_data *platform_data;
platform_data = qca199x_dev->client->dev.platform_data;
if (arg == 0) {
device_mode.handle_flavour = UNSOLICITED_MODE;
qca199x_dev->client->addr = NCI_I2C_SLAVE;
/* enable interrupts again */
qca199x_enable_irq(qca199x_dev);
} else if (arg == 1) {
device_mode.handle_flavour = SOLICITED_MODE;
qca199x_dev->client->addr = qca199x_dev->client->addr;
/* enable interrupts again */
qca199x_enable_irq(qca199x_dev);
} else if (arg == 2) {
device_mode.handle_flavour = UNSOLICITED_FTM_RAW_MODE;
nci_addr = qca199x_dev->client->addr;
/* replace with new client slave address*/
qca199x_dev->client->addr = 0xE;
/* We also need to disable interrupts */
qca199x_disable_irq(qca199x_dev);
} else if (arg == 3) {
device_mode.handle_flavour = SOLICITED_FTM_RAW_MODE;
nci_addr = qca199x_dev->client->addr;
/* replace with new client slave address*/
qca199x_dev->client->addr = 0xE;
/* We also need to disable interrupts */
qca199x_disable_irq(qca199x_dev);
} else {
device_mode.handle_flavour = UNSOLICITED_MODE;
qca199x_dev->client->addr = NCI_I2C_SLAVE;
}
return retval;
}
/*
* Inside nfc_ioctl_nfcc_efuse
*
* @brief nfc_ioctl_nfcc_efuse
*
*
*/
int nfc_ioctl_nfcc_efuse(struct file *filp, unsigned int cmd,
unsigned long arg)
{
int r = 0;
unsigned short slave_addr = 0xE;
unsigned short curr_addr;
unsigned char efuse_addr = EFUSE_REG;
unsigned char efuse_value = 0xFF;
struct qca199x_dev *qca199x_dev = filp->private_data;
curr_addr = qca199x_dev->client->addr;
qca199x_dev->client->addr = slave_addr;
r = nfc_i2c_write(qca199x_dev->client,
&efuse_addr, 1);
if (r < 0) {
/* Restore original NFCC slave I2C address */
qca199x_dev->client->addr = curr_addr;
dev_err(&qca199x_dev->client->dev,
"ERROR_WRITE_FAIL : i2c write fail\n");
return -EIO;
}
/*
* NFCC chip needs to be at least
* 10usec high before make it low
*/
usleep_range(10, 15);
r = i2c_master_recv(qca199x_dev->client, &efuse_value,
sizeof(efuse_value));
if (r < 0) {
/* Restore original NFCC slave I2C address */
qca199x_dev->client->addr = curr_addr;
dev_err(&qca199x_dev->client->dev,
"ERROR_I2C_RCV_FAIL : i2c recv fail\n");
return -EIO;
}
dev_dbg(&qca199x_dev->client->dev, "%s : EFUSE_VALUE %02x\n",
__func__, efuse_value);
/* Restore original NFCC slave I2C address */
qca199x_dev->client->addr = curr_addr;
return efuse_value;
}
/*
* Inside nfc_ioctl_nfcc_version
*
* @brief nfc_ioctl_nfcc_version
*
*
*/
int nfc_ioctl_nfcc_version(struct file *filp, unsigned int cmd,
unsigned long arg)
{
int r = 0;
unsigned short slave_addr = 0xE;
unsigned short curr_addr;
unsigned char raw_chip_version_addr = 0x00;
unsigned char raw_chip_rev_id_addr = 0x9C;
unsigned char raw_chip_version = 0xFF;
struct qca199x_dev *qca199x_dev = filp->private_data;
struct qca199x_platform_data *platform_data;
platform_data = qca199x_dev->client->dev.platform_data;
/*
* Always wake up chip when reading 0x9C, otherwise this
* register is not updated
*/
r = nfcc_wake(NFCC_WAKE, filp);
curr_addr = qca199x_dev->client->addr;
qca199x_dev->client->addr = slave_addr;
if (r) {
dev_err(&qca199x_dev->client->dev,
"%s: nfcc wake failed: %d\n", __func__, r);
r = -EIO;
goto leave;
}
if (arg == 0) {
r = nfc_i2c_write(qca199x_dev->client,
&raw_chip_version_addr, sizeof(raw_chip_version_addr));
if (r != sizeof(raw_chip_version_addr)) {
r = -EMSGSIZE;
goto err;
}
} else if (arg == 1) {
r = nfc_i2c_write(qca199x_dev->client,
&raw_chip_rev_id_addr, sizeof(raw_chip_rev_id_addr));
if (r != sizeof(raw_chip_version_addr)) {
r = -EMSGSIZE;
goto err;
}
} else {
r = -EINVAL;
goto err;
}
if (r < 0) {
r = -EIO;
goto err;
}
/*
* I2C line is low after ~10 usec
*/
usleep_range(10, 15);
r = i2c_master_recv(qca199x_dev->client, &raw_chip_version,
sizeof(raw_chip_version));
if (r != sizeof(raw_chip_version)) {
r = -EMSGSIZE;
goto err;
}
goto leave;
err:
dev_err(&qca199x_dev->client->dev,
"%s: i2c access failed\n", __func__);
leave:
/* Restore original NFCC slave I2C address */
qca199x_dev->client->addr = curr_addr;
return raw_chip_version;
}
/*
* Inside nfc_ioctl_kernel_logging
*
* @brief nfc_ioctl_kernel_logging
*
* (arg = 0) ; NO_LOGGING
* (arg = 1) ; COMMS_LOGGING - BASIC LOGGING - Mainly just comms over I2C
* (arg = 2) ; FULL_LOGGING - ENABLE ALL - DBG messages for handlers etc.
* ; ! Be aware as amount of logging could impact behaviour !
*
*
*/
int nfc_ioctl_kernel_logging(unsigned long arg, struct file *filp)
{
int retval = 0;
struct qca199x_dev *qca199x_dev = container_of(filp->private_data,
struct qca199x_dev,
qca199x_device);
if (arg == 0) {
dev_dbg(&qca199x_dev->client->dev,
"%s : level = NO_LOGGING\n", __func__);
logging_level = 0;
} else if (arg == 1) {
dev_dbg(&qca199x_dev->client->dev,
"%s: level = COMMS_LOGGING only\n", __func__);
logging_level = 1;
} else if (arg == 2) {
dev_dbg(&qca199x_dev->client->dev,
"%s: level = FULL_LOGGING\n", __func__);
logging_level = 2;
}
return retval;
}
/*
* Inside nfc_ioctl_core_reset_ntf
*
* @brief nfc_ioctl_core_reset_ntf
*
* Allows callers to determine if a CORE_RESET_NTF has arrived
*
* Returns the value of variable core_reset_ntf
*
*/
int nfc_ioctl_core_reset_ntf(struct file *filp, unsigned int cmd,
unsigned long arg)
{
struct qca199x_dev *qca199x_dev = filp->private_data;
dev_dbg(&qca199x_dev->client->dev,
"%s: returning = %d\n",
__func__,
qca199x_dev->core_reset_ntf);
return qca199x_dev->core_reset_ntf;
}
static long nfc_ioctl(struct file *pfile, unsigned int cmd,
unsigned long arg)
{
int r = 0;
struct qca199x_dev *qca199x_dev = pfile->private_data;
switch (cmd) {
case NFC_SET_PWR:
r = nfc_ioctl_power_states(pfile, cmd, arg);
break;
case NFCC_MODE:
r = nfc_ioctl_nfcc_mode(pfile, cmd, arg);
break;
case NFCC_VERSION:
r = nfc_ioctl_nfcc_version(pfile, cmd, arg);
break;
case NFC_KERNEL_LOGGING_MODE:
nfc_ioctl_kernel_logging(arg, pfile);
break;
case SET_RX_BLOCK:
break;
case SET_EMULATOR_TEST_POINT:
break;
case NFCC_INITIAL_CORE_RESET_NTF:
r = nfc_ioctl_core_reset_ntf(pfile, cmd, arg);
break;
case NFC_GET_EFUSE:
r = nfc_ioctl_nfcc_efuse(pfile, cmd, arg);
if (r < 0) {
r = 0xFF;
dev_err(&qca199x_dev->client->dev,
"nfc_ioctl : FAILED TO READ EFUSE TYPE\n");
}
break;
default:
r = -ENOIOCTLCMD;
}
return r;
}
static const struct file_operations nfc_dev_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.poll = nfc_poll,
.read = nfc_read,
.write = nfc_write,
.open = nfc_open,
.unlocked_ioctl = nfc_ioctl
};
void dumpqca1990(struct i2c_client *client)
{
int r = 0;
int i = 0;
unsigned char raw_reg_rd = {0x0};
unsigned short temp_addr;
temp_addr = client->addr;
client->addr = 0x0E;
for (i = 0; i < MAX_QCA_REG; i++) {
raw_reg_rd = i;
if (((i >= 0x0) && (i < 0x4)) || ((i > 0x7) && (i < 0xA)) ||
((i > 0xF) && (i < 0x12)) || ((i > 0x39) && (i < 0x4d)) ||
((i > 0x69) && (i < 0x74)) || (i == 0x18) || (i == 0x30) ||
(i == 0x58)) {
r = nfc_i2c_write(client, &raw_reg_rd,
sizeof(raw_reg_rd));
if (r != sizeof(raw_reg_rd))
break;
msleep(20);
r = i2c_master_recv(client, &raw_reg_rd,
sizeof(raw_reg_rd));
if (r != sizeof(raw_reg_rd))
break;
}
}
client->addr = temp_addr;
}
static int nfc_i2c_write(struct i2c_client *client, u8 *buf, int len)
{
int r;
r = i2c_master_send(client, buf, len);
dev_dbg(&client->dev, "%s: send: %d\n", __func__, r);
if (r == -EREMOTEIO) { /* Retry, chip was in standby */
usleep_range(6000, 10000);
r = i2c_master_send(client, buf, len);
dev_dbg(&client->dev, "%s: send attempt 2: %d\n", __func__, r);
}
if (r != len)
return -EREMOTEIO;
return r;
}
/* Check for availability of qca199x_ NFC controller hardware */
static int nfcc_hw_check(struct i2c_client *client, unsigned short curr_addr)
{
int r = 0;
unsigned char buf = 0;
client->addr = curr_addr;
/* Set-up Addr 0. No data written */
r = i2c_master_send(client, &buf, sizeof(buf));
if (r < 0)
goto err_presence_check;
buf = 0;
/* Read back from Addr 0 */
r = i2c_master_recv(client, &buf, sizeof(buf));
if (r < 0)
goto err_presence_check;
r = 0;
goto leave;
err_presence_check:
r = -ENXIO;
dev_err(&client->dev,
"%s: - no NFCC available\n", __func__);
leave:
return r;
}
/* Initialise qca199x_ NFC controller hardware */
static int nfcc_initialise(struct i2c_client *client, unsigned short curr_addr,
struct qca199x_dev *qca199x_dev)
{
int r = 0;
unsigned char raw_1P8_CONTROL_011[] = {0x11, XTAL_CLOCK};
unsigned char raw_1P8_CONTROL_010[] = {0x10, PWR_EN};
unsigned char raw_1P8_X0_0B0[] = {0xB0, (FREQ_SEL)};
unsigned char raw_slave1[] = {0x09, NCI_I2C_SLAVE};
unsigned char raw_slave2[] = {0x8, 0x10};
unsigned char raw_s73[] = {0x73, 0x02};
unsigned char raw_slave1_rd = {0x0};
unsigned char raw_1P8_PAD_CFG_CLK_REQ[] = {0xA5, 0x1};
unsigned char raw_1P8_PAD_CFG_PWR_REQ[] = {0xA7, 0x1};
unsigned char buf = 0;
bool core_reset_completed = false;
unsigned char rsp[6];
int time_taken = 0;
int ret = 0;
client->addr = curr_addr;
qca199x_dev->core_reset_ntf = DEFAULT_INITIAL_CORE_RESET_NTF;
r = i2c_master_send(client, &buf, sizeof(buf));
if (r < 0)
goto err_init;
/*
* I2C line is low after ~10 usec
*/
usleep_range(10, 15);
buf = 0;
r = i2c_master_recv(client, &buf, sizeof(buf));
if (r < 0)
goto err_init;
RAW(s73, 0x02);
r = nfc_i2c_write(client, &raw_s73[0], sizeof(raw_s73));
if (r < 0)
goto err_init;
usleep_range(1000, 1100);
RAW(1P8_CONTROL_011, XTAL_CLOCK | 0x01);
r = nfc_i2c_write(client, &raw_1P8_CONTROL_011[0],
sizeof(raw_1P8_CONTROL_011));
if (r < 0)
goto err_init;
usleep_range(1000, 1100); /* 1 ms wait */
RAW(1P8_CONTROL_010, (0x8));
r = nfc_i2c_write(client, &raw_1P8_CONTROL_010[0],
sizeof(raw_1P8_CONTROL_010));
if (r < 0)
goto err_init;
usleep_range(10000, 11000); /* 10 ms wait */
RAW(1P8_CONTROL_010, (0xC));
r = nfc_i2c_write(client, &raw_1P8_CONTROL_010[0],
sizeof(raw_1P8_CONTROL_010));
if (r < 0)
goto err_init;
usleep_range(100, 110); /* 100 us wait */
RAW(1P8_X0_0B0, (FREQ_SEL_19));
r = nfc_i2c_write(client, &raw_1P8_X0_0B0[0],
sizeof(raw_1P8_X0_0B0));
if (r < 0)
goto err_init;
usleep_range(1000, 1100); /* 1 ms wait */
/* PWR_EN = 1 */
RAW(1P8_CONTROL_010, (0xd));
r = nfc_i2c_write(client, &raw_1P8_CONTROL_010[0],
sizeof(raw_1P8_CONTROL_010));
if (r < 0)
goto err_init;
msleep(20); /* 20ms wait */
/* LS_EN = 1 */
RAW(1P8_CONTROL_010, 0xF);
r = nfc_i2c_write(client, &raw_1P8_CONTROL_010[0],
sizeof(raw_1P8_CONTROL_010));
if (r < 0)
goto err_init;
msleep(20); /* 20ms wait */
/* Enable the PMIC clock */
RAW(1P8_PAD_CFG_CLK_REQ, (0x1));
r = nfc_i2c_write(client, &raw_1P8_PAD_CFG_CLK_REQ[0],
sizeof(raw_1P8_PAD_CFG_CLK_REQ));
if (r < 0)
goto err_init;
usleep_range(1000, 1100); /* 1 ms wait */
RAW(1P8_PAD_CFG_PWR_REQ, (0x1));
r = nfc_i2c_write(client, &raw_1P8_PAD_CFG_PWR_REQ[0],
sizeof(raw_1P8_PAD_CFG_PWR_REQ));
if (r < 0)
goto err_init;
usleep_range(1000, 1100); /* 1 ms wait */
RAW(slave2, 0x10);
r = nfc_i2c_write(client, &raw_slave2[0], sizeof(raw_slave2));
if (r < 0)
goto err_init;
usleep_range(1000, 1100); /* 1 ms wait */
RAW(slave1, NCI_I2C_SLAVE);
r = nfc_i2c_write(client, &raw_slave1[0], sizeof(raw_slave1));
if (r < 0)
goto err_init;
usleep_range(1000, 1100); /* 1 ms wait */
/* QCA199x NFCC CPU should now boot... */
r = i2c_master_recv(client, &raw_slave1_rd, sizeof(raw_slave1_rd));
if (r < 0)
goto err_init;
/* Talk on NCI slave address NCI_I2C_SLAVE 0x2C*/
client->addr = NCI_I2C_SLAVE;
/*
* Start with small delay and then we will poll until we
* get a core reset notification - This is time for chip
* & NFCC controller to come-up.
*/
usleep_range(15000, 16500); /* 15 ms */
do {
ret = i2c_master_recv(client, rsp, sizeof(rsp));
if (ret < 0)
goto err_init;
/* Found core reset notification */
if ((rsp[0] == CORE_RESET_RSP_GID) &&
(rsp[1] == CORE_RESET_OID) &&
(rsp[2] == CORE_RST_NTF_LENGTH)) {
dev_dbg(&client->dev,
"NFC core reset recvd: %s: info: %p\n",
__func__, client);
core_reset_completed = true;
} else {
usleep_range(2000, 2200); /* 2 ms wait before retry */
}
time_taken++;
} while (!core_reset_completed && (time_taken < NTF_TIMEOUT));
if (time_taken >= NTF_TIMEOUT) {
qca199x_dev->core_reset_ntf = TIMEDOUT_INITIAL_CORE_RESET_NTF;
goto err_init;
}
qca199x_dev->core_reset_ntf = ARRIVED_INITIAL_CORE_RESET_NTF;
r = 0;
return r;
err_init:
r = 1;
dev_err(&client->dev,
"%s: failed. Check Hardware\n", __func__);
return r;
}
/*
Routine to Select clocks
*/
static int qca199x_clock_select(struct qca199x_dev *qca199x_dev)
{
int r = 0;
if (!strcmp(qca199x_dev->clk_src_name, "BBCLK2")) {
qca199x_dev->s_clk =
clk_get(&qca199x_dev->client->dev, "ref_clk");
if (qca199x_dev->s_clk == NULL)
goto err_invalid_dis_gpio;
} else if (!strcmp(qca199x_dev->clk_src_name, "RFCLK3")) {
qca199x_dev->s_clk =
clk_get(&qca199x_dev->client->dev, "ref_clk_rf");
if (qca199x_dev->s_clk == NULL)
goto err_invalid_dis_gpio;
} else if (!strcmp(qca199x_dev->clk_src_name, "GPCLK")) {
if (gpio_is_valid(qca199x_dev->clk_src_gpio)) {
qca199x_dev->s_clk =
clk_get(&qca199x_dev->client->dev,
"core_clk");
if (qca199x_dev->s_clk == NULL)
goto err_invalid_dis_gpio;
} else {
goto err_invalid_dis_gpio;
}
} else if (!strcmp(qca199x_dev->clk_src_name, "GPCLK2")) {
if (gpio_is_valid(qca199x_dev->clk_src_gpio)) {
qca199x_dev->s_clk =
clk_get(&qca199x_dev->client->dev,
"core_clk_pvt");
if (qca199x_dev->s_clk == NULL)
goto err_invalid_dis_gpio;
} else {
goto err_invalid_dis_gpio;
}
} else {
qca199x_dev->s_clk = NULL;
goto err_invalid_dis_gpio;
}
if (qca199x_dev->clk_run == false) {
/* Set clock rate */
if ((!strcmp(qca199x_dev->clk_src_name, "GPCLK")) ||
(!strcmp(qca199x_dev->clk_src_name, "GPCLK2"))) {
r = clk_set_rate(qca199x_dev->s_clk, NFC_RF_CLK_FREQ);
if (r)
goto err_invalid_clk;
}
r = clk_prepare_enable(qca199x_dev->s_clk);
if (r)
goto err_invalid_clk;
qca199x_dev->clk_run = true;
}
r = 0;
return r;
err_invalid_clk:
r = -1;
return r;
err_invalid_dis_gpio:
r = -2;
return r;
}
/*
Routine to De-Select clocks
*/
static int qca199x_clock_deselect(struct qca199x_dev *qca199x_dev)
{
int r = -1;
if (qca199x_dev->s_clk != NULL) {
if (qca199x_dev->clk_run == true) {
clk_disable_unprepare(qca199x_dev->s_clk);
qca199x_dev->clk_run = false;
}
return 0;
}
return r;
}
static int nfc_parse_dt(struct device *dev, struct qca199x_platform_data *pdata)
{
int r = 0;
struct device_node *np = dev->of_node;
r = of_property_read_u32(np, "reg", &pdata->reg);
if (r)
return -EINVAL;
pdata->dis_gpio = of_get_named_gpio(np, "qcom,dis-gpio", 0);
if ((!gpio_is_valid(pdata->dis_gpio)))
return -EINVAL;
disable_ctrl = pdata->dis_gpio;
pdata->irq_gpio = of_get_named_gpio(np, "qcom,irq-gpio", 0);
if ((!gpio_is_valid(pdata->irq_gpio)))
return -EINVAL;
r = of_property_read_string(np, "qcom,clk-src", &pdata->clk_src_name);
if (strcmp(pdata->clk_src_name, "GPCLK2")) {
pdata->clkreq_gpio = of_get_named_gpio(np, "qcom,clk-gpio", 0);
}
if ((!strcmp(pdata->clk_src_name, "GPCLK")) ||
(!strcmp(pdata->clk_src_name, "GPCLK2"))) {
pdata->clk_src_gpio = of_get_named_gpio(np,
"qcom,clk-src-gpio", 0);
if ((!gpio_is_valid(pdata->clk_src_gpio)))
return -EINVAL;
pdata->irq_gpio_clk_req = of_get_named_gpio(np,
"qcom,clk-req-gpio", 0);
if ((!gpio_is_valid(pdata->irq_gpio_clk_req)))
return -EINVAL;
}
if (r)
return -EINVAL;
return r;
}
static int qca199x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int r = 0;
int irqn = 0;
struct qca199x_platform_data *platform_data;
struct qca199x_dev *qca199x_dev;
if (client->dev.of_node) {
platform_data = devm_kzalloc(&client->dev,
sizeof(struct qca199x_platform_data), GFP_KERNEL);
if (!platform_data) {
dev_err(&client->dev,
"%s: Failed to allocate memory\n", __func__);
return -ENOMEM;
}
r = nfc_parse_dt(&client->dev, platform_data);
if (r)
return r;
} else {
platform_data = client->dev.platform_data;
}
if (!platform_data)
return -EINVAL;
dev_dbg(&client->dev,
"%s, inside nfc-nci flags = %x\n",
__func__, client->flags);
if (platform_data == NULL) {
dev_err(&client->dev, "%s: failed\n", __func__);
return -ENODEV;
}
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(&client->dev, "%s: need I2C_FUNC_I2C\n", __func__);
return -ENODEV;
}
qca199x_dev = kzalloc(sizeof(*qca199x_dev), GFP_KERNEL);
if (qca199x_dev == NULL) {
dev_err(&client->dev,
"%s: failed to allocate memory for module data\n", __func__);
return -ENOMEM;
}
qca199x_dev->client = client;
/*
* To be efficient we need to test whether nfcc hardware is physically
* present before attempting further hardware initialisation.
* For this we need to be sure the device is in ULPM state by
* setting disable line low early on.
*
*/
if (gpio_is_valid(platform_data->dis_gpio)) {
r = gpio_request(platform_data->dis_gpio, "nfc_reset_gpio");
if (r) {
dev_err(&client->dev,
"%s: unable to request gpio [%d]\n",
__func__,
platform_data->dis_gpio);
goto err_free_dev;
}
r = gpio_direction_output(platform_data->dis_gpio, 1);
if (r) {
dev_err(&client->dev,
"%s: unable to set direction for gpio [%d]\n",
__func__,
platform_data->dis_gpio);
goto err_dis_gpio;
}
} else {
dev_err(&client->dev, "%s: dis gpio not provided\n", __func__);
goto err_free_dev;
}
/* Guarantee that the NFCC starts in a clean state. */
gpio_set_value(platform_data->dis_gpio, 1);/* HPD */
usleep_range(200, 220);
gpio_set_value(platform_data->dis_gpio, 0);/* ULPM */
usleep_range(200, 220);
r = nfcc_hw_check(client, platform_data->reg);
if (r) {
/* We don't think there is hardware but just in case HPD */
gpio_set_value(platform_data->dis_gpio, 1);
goto err_dis_gpio;
}
if (gpio_is_valid(platform_data->irq_gpio)) {
r = gpio_request(platform_data->irq_gpio, "nfc_irq_gpio");
if (r) {
dev_err(&client->dev, "%s: unable to request gpio [%d]\n",
__func__,
platform_data->irq_gpio);
goto err_dis_gpio;
}
r = gpio_direction_input(platform_data->irq_gpio);
if (r) {
dev_err(&client->dev,
"%s: unable to set direction for gpio [%d]\n",
__func__,
platform_data->irq_gpio);
goto err_irq;
}
irqn = gpio_to_irq(platform_data->irq_gpio);
if (irqn < 0) {
r = irqn;
goto err_irq;
}
client->irq = irqn;
} else {
dev_err(&client->dev, "%s: irq gpio not provided\n", __func__);
goto err_dis_gpio;
}
/* Interrupt from NFCC CLK_REQ to handle REF_CLK
o/p gating/selection */
if ((!strcmp(platform_data->clk_src_name, "GPCLK")) ||
(!strcmp(platform_data->clk_src_name, "GPCLK2"))) {
if (gpio_is_valid(platform_data->irq_gpio_clk_req)) {
r = gpio_request(platform_data->irq_gpio_clk_req,
"nfc_irq_gpio_clk_en");
if (r) {
dev_err(&client->dev,
"%s: unable to request CLK_EN gpio [%d]\n",
__func__,
platform_data->irq_gpio_clk_req);
goto err_irq;
}
r = gpio_direction_input(
platform_data->irq_gpio_clk_req);
if (r) {
dev_err(&client->dev,
"%s: cannot set direction CLK_EN gpio [%d]\n",
__func__, platform_data->irq_gpio_clk_req);
goto err_irq_clk;
}
gpio_to_irq(0);
irqn = gpio_to_irq(platform_data->irq_gpio_clk_req);
if (irqn < 0) {
r = irqn;
goto err_irq_clk;
}
platform_data->clk_req_irq_num = irqn;
} else {
dev_err(&client->dev,
"%s: irq CLK_EN gpio not provided\n", __func__);
goto err_irq;
}
}
/* Get the clock source name and gpio from from Device Tree */
qca199x_dev->clk_src_name = platform_data->clk_src_name;
qca199x_dev->clk_src_gpio = platform_data->clk_src_gpio;
qca199x_dev->clk_run = false;
r = qca199x_clock_select(qca199x_dev);
if (r != 0) {
if (r == -1)
goto err_clk;
else
goto err_irq_clk;
}
if (strcmp(platform_data->clk_src_name, "GPCLK2")) {
if (gpio_is_valid(platform_data->clkreq_gpio)) {
r = gpio_request(platform_data->clkreq_gpio,
"nfc_clkreq_gpio");
if (r) {
dev_err(&client->dev,
"%s: unable to request gpio [%d]\n",
__func__, platform_data->clkreq_gpio);
goto err_clkreq_gpio;
}
r = gpio_direction_input(platform_data->clkreq_gpio);
if (r) {
dev_err(&client->dev,
"%s: cannot set direction for gpio [%d]\n",
__func__, platform_data->clkreq_gpio);
goto err_clkreq_gpio;
}
} else {
dev_err(&client->dev,
"%s: clkreq gpio not provided\n", __func__);
goto err_clk;
}
qca199x_dev->clkreq_gpio = platform_data->clkreq_gpio;
}
qca199x_dev->dis_gpio = platform_data->dis_gpio;
qca199x_dev->irq_gpio = platform_data->irq_gpio;
if ((!strcmp(platform_data->clk_src_name, "GPCLK")) ||
(!strcmp(platform_data->clk_src_name, "GPCLK2"))) {
qca199x_dev->irq_gpio_clk_req =
platform_data->irq_gpio_clk_req;
qca199x_dev->clk_req_irq_num =
platform_data->clk_req_irq_num;
}
/* init mutex and queues */
init_waitqueue_head(&qca199x_dev->read_wq);
mutex_init(&qca199x_dev->read_mutex);
spin_lock_init(&qca199x_dev->irq_enabled_lock);
spin_lock_init(&qca199x_dev->irq_enabled_lock_clk_req);
qca199x_dev->qca199x_device.minor = MISC_DYNAMIC_MINOR;
qca199x_dev->qca199x_device.name = "nfc-nci";
qca199x_dev->qca199x_device.fops = &nfc_dev_fops;
r = misc_register(&qca199x_dev->qca199x_device);
if (r) {
dev_err(&client->dev, "%s: misc_register failed\n", __func__);
goto err_misc_register;
}
/*
* Reboot the NFCC now that all resources are ready
*
* The NFCC takes time to transition between power states.
* We wait 20uS for the NFCC to shutdown. (HPD)
* We wait 100uS for the NFCC to boot into ULPM.
*/
gpio_set_value(platform_data->dis_gpio, 1);/* HPD */
msleep(20);
gpio_set_value(platform_data->dis_gpio, 0);/* ULPM */
msleep(100);
/* Here we perform a second presence check. */
r = nfcc_hw_check(client, platform_data->reg);
if (r) {
/* We don't think there is hardware but just in case HPD */
gpio_set_value(platform_data->dis_gpio, 1);
goto err_nfcc_not_present;
}
logging_level = 0;
/*
* request irq. The irq is set whenever the chip has data available
* for reading. It is cleared when all data has been read.
*/
device_mode.handle_flavour = UNSOLICITED_MODE;
/* NFC_INT IRQ */
qca199x_dev->irq_enabled = true;
r = request_irq(client->irq, qca199x_dev_irq_handler,
IRQF_TRIGGER_RISING, client->name, qca199x_dev);
if (r) {
dev_err(&client->dev, "%s: request_irq failed\n", __func__);
goto err_request_irq_failed;
}
qca199x_disable_irq(qca199x_dev);
/* CLK_REQ IRQ */
if ((!strcmp(platform_data->clk_src_name, "GPCLK")) ||
(!strcmp(platform_data->clk_src_name, "GPCLK2"))) {
r = request_irq(qca199x_dev->clk_req_irq_num,
qca199x_dev_irq_handler_clk_req,
(IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING),
client->name, qca199x_dev);
if (r) {
dev_err(&client->dev,
"%s: request_irq failed. irq no = %d\n, main irq = %d",
__func__,
qca199x_dev->clk_req_irq_num, client->irq);
goto err_request_irq_failed;
}
qca199x_dev->irq_enabled_clk_req = true;
qca199x_disable_irq_clk_req(qca199x_dev);
qca199x_dev->my_wq =
create_singlethread_workqueue("qca1990x_CLK_REQ_queue");
if (!qca199x_dev->my_wq)
goto err_create_workq;
INIT_WORK(&qca199x_dev->msm_clock_controll_work,
clk_req_update);
}
device_init_wakeup(&client->dev, true);
device_set_wakeup_capable(&client->dev, true);
i2c_set_clientdata(client, qca199x_dev);
gpio_set_value(platform_data->dis_gpio, 1);
/* To keep track if region2 command has been sent to controller */
region2_sent = false;
dev_dbg(&client->dev,
"%s: probing qca1990 exited successfully\n",
__func__);
return 0;
err_create_workq:
dev_err(&client->dev,
"%s: work_queue creation failure\n",
__func__);
free_irq(client->irq, qca199x_dev);
err_nfcc_not_present:
err_request_irq_failed:
misc_deregister(&qca199x_dev->qca199x_device);
err_misc_register:
mutex_destroy(&qca199x_dev->read_mutex);
err_clkreq_gpio:
if (strcmp(platform_data->clk_src_name, "GPCLK2"))
gpio_free(platform_data->clkreq_gpio);
err_clk:
qca199x_clock_deselect(qca199x_dev);
err_irq_clk:
if ((!strcmp(platform_data->clk_src_name, "GPCLK")) ||
(!strcmp(platform_data->clk_src_name, "GPCLK2"))) {
r = gpio_direction_input(platform_data->irq_gpio_clk_req);
if (r)
dev_err(&client->dev,
"%s: Unable to set direction\n", __func__);
gpio_free(platform_data->irq_gpio_clk_req);
}
err_irq:
gpio_free(platform_data->irq_gpio);
err_dis_gpio:
gpio_free(platform_data->dis_gpio);
err_free_dev:
kfree(qca199x_dev);
return r;
}
static int qca199x_remove(struct i2c_client *client)
{
struct qca199x_dev *qca199x_dev;
qca199x_dev = i2c_get_clientdata(client);
free_irq(client->irq, qca199x_dev);
misc_deregister(&qca199x_dev->qca199x_device);
mutex_destroy(&qca199x_dev->read_mutex);
gpio_free(qca199x_dev->irq_gpio);
if ((!strcmp(qca199x_dev->clk_src_name, "GPCLK")) ||
(!strcmp(qca199x_dev->clk_src_name, "GPCLK2"))) {
gpio_free(qca199x_dev->irq_gpio_clk_req);
}
gpio_free(qca199x_dev->dis_gpio);
if (strcmp(qca199x_dev->clk_src_name, "GPCLK2"))
gpio_free(qca199x_dev->clkreq_gpio);
kfree(qca199x_dev);
return 0;
}
static int qca199x_suspend(struct device *device)
{
struct i2c_client *client = to_i2c_client(device);
if (device_may_wakeup(&client->dev))
enable_irq_wake(client->irq);
return 0;
}
static int qca199x_resume(struct device *device)
{
struct i2c_client *client = to_i2c_client(device);
if (device_may_wakeup(&client->dev))
disable_irq_wake(client->irq);
return 0;
}
static const struct i2c_device_id qca199x_id[] = {
{"qca199x-i2c", 0},
{}
};
static const struct dev_pm_ops nfc_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(qca199x_suspend, qca199x_resume)
};
static struct i2c_driver qca199x = {
.id_table = qca199x_id,
.probe = qca199x_probe,
.remove = qca199x_remove,
.driver = {
.owner = THIS_MODULE,
.name = "nfc-nci",
.of_match_table = msm_match_table,
.pm = &nfc_pm_ops,
},
};
static int nfcc_reboot(struct notifier_block *notifier, unsigned long val,
void *v)
{
/*
* Set DISABLE=1 *ONLY* if the NFC service has been disabled.
* This will put NFCC into HPD(Hard Power Down) state for power
* saving when powering down(Low Batt. or Power off handset)
* If user requires NFC and CE mode when powered down(PD) the
* middleware puts NFCC into region2 prior to PD. In this case
* we DO NOT HPD chip as this will trash Region2 and CE support
* when handset is PD.
*/
if (region2_sent == false) {
/* HPD the NFCC */
gpio_set_value(disable_ctrl, 1);
}
return NOTIFY_OK;
}
static struct notifier_block nfcc_notifier = {
.notifier_call = nfcc_reboot,
.next = NULL,
.priority = 0
};
/*
* module load/unload record keeping
*/
static int __init qca199x_dev_init(void)
{
int ret;
ret = register_reboot_notifier(&nfcc_notifier);
if (ret) {
pr_err("cannot register reboot notifier (err=%d)\n", ret);
return ret;
}
return i2c_add_driver(&qca199x);
}
module_init(qca199x_dev_init);
static void __exit qca199x_dev_exit(void)
{
unregister_reboot_notifier(&nfcc_notifier);
i2c_del_driver(&qca199x);
}
module_exit(qca199x_dev_exit);
MODULE_DESCRIPTION("NFC QCA199x");
MODULE_LICENSE("GPL v2");