| /* Copyright (c) 2015-2017, 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/irq.h> |
| #include <linux/delay.h> |
| #include <linux/interrupt.h> |
| #include <linux/gpio.h> |
| #include <linux/spinlock.h> |
| #include <linux/of_gpio.h> |
| #include <linux/of_device.h> |
| #include <linux/uaccess.h> |
| #include "nq-nci.h" |
| #include <linux/clk.h> |
| #ifdef CONFIG_COMPAT |
| #include <linux/compat.h> |
| #endif |
| |
| struct nqx_platform_data { |
| unsigned int irq_gpio; |
| unsigned int en_gpio; |
| unsigned int clkreq_gpio; |
| unsigned int firm_gpio; |
| unsigned int ese_gpio; |
| const char *clk_src_name; |
| }; |
| |
| static const struct of_device_id msm_match_table[] = { |
| {.compatible = "qcom,nq-nci"}, |
| {} |
| }; |
| |
| MODULE_DEVICE_TABLE(of, msm_match_table); |
| |
| #define MAX_BUFFER_SIZE (320) |
| #define WAKEUP_SRC_TIMEOUT (2000) |
| #define MAX_RETRY_COUNT 3 |
| |
| struct nqx_dev { |
| wait_queue_head_t read_wq; |
| struct mutex read_mutex; |
| struct i2c_client *client; |
| struct miscdevice nqx_device; |
| union nqx_uinfo nqx_info; |
| /* NFC GPIO variables */ |
| unsigned int irq_gpio; |
| unsigned int en_gpio; |
| unsigned int firm_gpio; |
| unsigned int clkreq_gpio; |
| unsigned int ese_gpio; |
| /* NFC VEN pin state powered by Nfc */ |
| bool nfc_ven_enabled; |
| /* NFC_IRQ state */ |
| bool irq_enabled; |
| /* NFC_IRQ wake-up state */ |
| bool irq_wake_up; |
| spinlock_t irq_enabled_lock; |
| unsigned int count_irq; |
| /* Initial CORE RESET notification */ |
| unsigned int core_reset_ntf; |
| /* CLK control */ |
| bool clk_run; |
| struct clk *s_clk; |
| /* read buffer*/ |
| size_t kbuflen; |
| u8 *kbuf; |
| struct nqx_platform_data *pdata; |
| }; |
| |
| static int nfcc_reboot(struct notifier_block *notifier, unsigned long val, |
| void *v); |
| /*clock enable function*/ |
| static int nqx_clock_select(struct nqx_dev *nqx_dev); |
| /*clock disable function*/ |
| static int nqx_clock_deselect(struct nqx_dev *nqx_dev); |
| static struct notifier_block nfcc_notifier = { |
| .notifier_call = nfcc_reboot, |
| .next = NULL, |
| .priority = 0 |
| }; |
| |
| unsigned int disable_ctrl; |
| |
| static void nqx_init_stat(struct nqx_dev *nqx_dev) |
| { |
| nqx_dev->count_irq = 0; |
| } |
| |
| static void nqx_disable_irq(struct nqx_dev *nqx_dev) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&nqx_dev->irq_enabled_lock, flags); |
| if (nqx_dev->irq_enabled) { |
| disable_irq_nosync(nqx_dev->client->irq); |
| nqx_dev->irq_enabled = false; |
| } |
| spin_unlock_irqrestore(&nqx_dev->irq_enabled_lock, flags); |
| } |
| |
| /** |
| * nqx_enable_irq() |
| * |
| * Check if interrupt is enabled or not |
| * and enable interrupt |
| * |
| * Return: void |
| */ |
| static void nqx_enable_irq(struct nqx_dev *nqx_dev) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&nqx_dev->irq_enabled_lock, flags); |
| if (!nqx_dev->irq_enabled) { |
| nqx_dev->irq_enabled = true; |
| enable_irq(nqx_dev->client->irq); |
| } |
| spin_unlock_irqrestore(&nqx_dev->irq_enabled_lock, flags); |
| } |
| |
| static irqreturn_t nqx_dev_irq_handler(int irq, void *dev_id) |
| { |
| struct nqx_dev *nqx_dev = dev_id; |
| unsigned long flags; |
| |
| if (device_may_wakeup(&nqx_dev->client->dev)) |
| pm_wakeup_event(&nqx_dev->client->dev, WAKEUP_SRC_TIMEOUT); |
| |
| nqx_disable_irq(nqx_dev); |
| spin_lock_irqsave(&nqx_dev->irq_enabled_lock, flags); |
| nqx_dev->count_irq++; |
| spin_unlock_irqrestore(&nqx_dev->irq_enabled_lock, flags); |
| wake_up(&nqx_dev->read_wq); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static ssize_t nfc_read(struct file *filp, char __user *buf, |
| size_t count, loff_t *offset) |
| { |
| struct nqx_dev *nqx_dev = filp->private_data; |
| unsigned char *tmp = NULL; |
| int ret; |
| int irq_gpio_val = 0; |
| |
| if (!nqx_dev) { |
| ret = -ENODEV; |
| goto out; |
| } |
| |
| if (count > nqx_dev->kbuflen) |
| count = nqx_dev->kbuflen; |
| |
| dev_dbg(&nqx_dev->client->dev, "%s : reading %zu bytes.\n", |
| __func__, count); |
| |
| mutex_lock(&nqx_dev->read_mutex); |
| |
| irq_gpio_val = gpio_get_value(nqx_dev->irq_gpio); |
| if (irq_gpio_val == 0) { |
| if (filp->f_flags & O_NONBLOCK) { |
| dev_err(&nqx_dev->client->dev, |
| ":f_falg has O_NONBLOCK. EAGAIN\n"); |
| ret = -EAGAIN; |
| goto err; |
| } |
| while (1) { |
| ret = 0; |
| if (!nqx_dev->irq_enabled) { |
| nqx_dev->irq_enabled = true; |
| enable_irq(nqx_dev->client->irq); |
| } |
| if (!gpio_get_value(nqx_dev->irq_gpio)) { |
| ret = wait_event_interruptible(nqx_dev->read_wq, |
| !nqx_dev->irq_enabled); |
| } |
| if (ret) |
| goto err; |
| nqx_disable_irq(nqx_dev); |
| |
| if (gpio_get_value(nqx_dev->irq_gpio)) |
| break; |
| dev_err_ratelimited(&nqx_dev->client->dev, |
| "gpio is low, no need to read data\n"); |
| } |
| } |
| |
| tmp = nqx_dev->kbuf; |
| if (!tmp) { |
| dev_err(&nqx_dev->client->dev, |
| "%s: device doesn't exist anymore\n", __func__); |
| ret = -ENODEV; |
| goto err; |
| } |
| memset(tmp, 0x00, count); |
| |
| /* Read data */ |
| ret = i2c_master_recv(nqx_dev->client, tmp, count); |
| if (ret < 0) { |
| dev_err(&nqx_dev->client->dev, |
| "%s: i2c_master_recv returned %d\n", __func__, ret); |
| goto err; |
| } |
| if (ret > count) { |
| dev_err(&nqx_dev->client->dev, |
| "%s: received too many bytes from i2c (%d)\n", |
| __func__, ret); |
| ret = -EIO; |
| goto err; |
| } |
| #ifdef NFC_KERNEL_BU |
| dev_dbg(&nqx_dev->client->dev, "%s : NfcNciRx %x %x %x\n", |
| __func__, tmp[0], tmp[1], tmp[2]); |
| #endif |
| if (copy_to_user(buf, tmp, ret)) { |
| dev_warn(&nqx_dev->client->dev, |
| "%s : failed to copy to user space\n", __func__); |
| ret = -EFAULT; |
| goto err; |
| } |
| mutex_unlock(&nqx_dev->read_mutex); |
| return ret; |
| |
| err: |
| mutex_unlock(&nqx_dev->read_mutex); |
| out: |
| return ret; |
| } |
| |
| static ssize_t nfc_write(struct file *filp, const char __user *buf, |
| size_t count, loff_t *offset) |
| { |
| struct nqx_dev *nqx_dev = filp->private_data; |
| char *tmp = NULL; |
| int ret = 0; |
| |
| if (!nqx_dev) { |
| ret = -ENODEV; |
| goto out; |
| } |
| if (count > nqx_dev->kbuflen) { |
| dev_err(&nqx_dev->client->dev, "%s: out of memory\n", |
| __func__); |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| tmp = memdup_user(buf, count); |
| if (IS_ERR(tmp)) { |
| dev_err(&nqx_dev->client->dev, "%s: memdup_user failed\n", |
| __func__); |
| ret = PTR_ERR(tmp); |
| goto out; |
| } |
| |
| ret = i2c_master_send(nqx_dev->client, tmp, count); |
| if (ret != count) { |
| dev_err(&nqx_dev->client->dev, |
| "%s: failed to write %d\n", __func__, ret); |
| ret = -EIO; |
| goto out_free; |
| } |
| #ifdef NFC_KERNEL_BU |
| dev_dbg(&nqx_dev->client->dev, |
| "%s : i2c-%d: NfcNciTx %x %x %x\n", |
| __func__, iminor(file_inode(filp)), |
| tmp[0], tmp[1], tmp[2]); |
| #endif |
| usleep_range(1000, 1100); |
| out_free: |
| kfree(tmp); |
| out: |
| return ret; |
| } |
| |
| /** |
| * nqx_standby_write() |
| * @buf: pointer to data buffer |
| * @len: # of bytes need to transfer |
| * |
| * write data buffer over I2C and retry |
| * if NFCC is in stand by mode |
| * |
| * Return: # of bytes written or -ve value in case of error |
| */ |
| static int nqx_standby_write(struct nqx_dev *nqx_dev, |
| const unsigned char *buf, size_t len) |
| { |
| int ret = -EINVAL; |
| int retry_cnt; |
| |
| for (retry_cnt = 1; retry_cnt <= MAX_RETRY_COUNT; retry_cnt++) { |
| ret = i2c_master_send(nqx_dev->client, buf, len); |
| if (ret < 0) { |
| dev_err(&nqx_dev->client->dev, |
| "%s: write failed, Maybe in Standby Mode - Retry(%d)\n", |
| __func__, retry_cnt); |
| usleep_range(1000, 1100); |
| } else if (ret == len) |
| break; |
| } |
| return ret; |
| } |
| |
| /* |
| * Power management of the eSE |
| * NFC & eSE ON : NFC_EN high and eSE_pwr_req high. |
| * NFC OFF & eSE ON : NFC_EN high and eSE_pwr_req high. |
| * NFC OFF & eSE OFF : NFC_EN low and eSE_pwr_req low. |
| */ |
| static int nqx_ese_pwr(struct nqx_dev *nqx_dev, unsigned long int arg) |
| { |
| int r = -1; |
| const unsigned char svdd_off_cmd_warn[] = {0x2F, 0x31, 0x01, 0x01}; |
| const unsigned char svdd_off_cmd_done[] = {0x2F, 0x31, 0x01, 0x00}; |
| |
| if (!gpio_is_valid(nqx_dev->ese_gpio)) { |
| dev_err(&nqx_dev->client->dev, |
| "%s: ese_gpio is not valid\n", __func__); |
| return -EINVAL; |
| } |
| |
| if (arg == 0) { |
| /* |
| * We want to power on the eSE and to do so we need the |
| * eSE_pwr_req pin and the NFC_EN pin to be high |
| */ |
| if (gpio_get_value(nqx_dev->ese_gpio)) { |
| dev_dbg(&nqx_dev->client->dev, "ese_gpio is already high\n"); |
| r = 0; |
| } else { |
| /** |
| * Let's store the NFC_EN pin state |
| * only if the eSE is not yet on |
| */ |
| nqx_dev->nfc_ven_enabled = |
| gpio_get_value(nqx_dev->en_gpio); |
| if (!nqx_dev->nfc_ven_enabled) { |
| gpio_set_value(nqx_dev->en_gpio, 1); |
| /* hardware dependent delay */ |
| usleep_range(1000, 1100); |
| } |
| gpio_set_value(nqx_dev->ese_gpio, 1); |
| if (gpio_get_value(nqx_dev->ese_gpio)) { |
| dev_dbg(&nqx_dev->client->dev, "ese_gpio is enabled\n"); |
| r = 0; |
| } |
| } |
| } else if (arg == 1) { |
| if (nqx_dev->nfc_ven_enabled && |
| ((nqx_dev->nqx_info.info.chip_type == NFCC_NQ_220) || |
| (nqx_dev->nqx_info.info.chip_type == NFCC_PN66T))) { |
| /** |
| * Let's inform the CLF we're |
| * powering off the eSE |
| */ |
| r = nqx_standby_write(nqx_dev, svdd_off_cmd_warn, |
| sizeof(svdd_off_cmd_warn)); |
| if (r < 0) { |
| dev_err(&nqx_dev->client->dev, |
| "%s: write failed after max retry\n", |
| __func__); |
| return -ENXIO; |
| } |
| dev_dbg(&nqx_dev->client->dev, |
| "%s: svdd_off_cmd_warn sent\n", __func__); |
| |
| /* let's power down the eSE */ |
| gpio_set_value(nqx_dev->ese_gpio, 0); |
| dev_dbg(&nqx_dev->client->dev, |
| "%s: nqx_dev->ese_gpio set to 0\n", __func__); |
| |
| /** |
| * Time needed for the SVDD capacitor |
| * to get discharged |
| */ |
| usleep_range(8000, 8100); |
| |
| /* Let's inform the CLF the eSE is now off */ |
| r = nqx_standby_write(nqx_dev, svdd_off_cmd_done, |
| sizeof(svdd_off_cmd_done)); |
| if (r < 0) { |
| dev_err(&nqx_dev->client->dev, |
| "%s: write failed after max retry\n", |
| __func__); |
| return -ENXIO; |
| } |
| dev_dbg(&nqx_dev->client->dev, |
| "%s: svdd_off_cmd_done sent\n", __func__); |
| } else { |
| /** |
| * In case the NFC is off, |
| * there's no need to send the i2c commands |
| */ |
| gpio_set_value(nqx_dev->ese_gpio, 0); |
| } |
| |
| if (!gpio_get_value(nqx_dev->ese_gpio)) { |
| dev_dbg(&nqx_dev->client->dev, "ese_gpio is disabled\n"); |
| r = 0; |
| } |
| |
| if (!nqx_dev->nfc_ven_enabled) { |
| /* hardware dependent delay */ |
| usleep_range(1000, 1100); |
| dev_dbg(&nqx_dev->client->dev, "disabling en_gpio\n"); |
| gpio_set_value(nqx_dev->en_gpio, 0); |
| } |
| } else if (arg == 3) { |
| r = gpio_get_value(nqx_dev->ese_gpio); |
| } |
| return r; |
| } |
| |
| static int nfc_open(struct inode *inode, struct file *filp) |
| { |
| int ret = 0; |
| struct nqx_dev *nqx_dev = container_of(filp->private_data, |
| struct nqx_dev, nqx_device); |
| |
| filp->private_data = nqx_dev; |
| nqx_init_stat(nqx_dev); |
| |
| dev_dbg(&nqx_dev->client->dev, |
| "%s: %d,%d\n", __func__, imajor(inode), iminor(inode)); |
| return ret; |
| } |
| |
| /* |
| * nfc_ioctl_power_states() - power control |
| * @filp: pointer to the file descriptor |
| * @arg: mode that we want to move to |
| * |
| * Device power control. Depending on the arg value, device moves to |
| * different states |
| * (arg = 0): NFC_ENABLE GPIO = 0, FW_DL GPIO = 0 |
| * (arg = 1): NFC_ENABLE GPIO = 1, FW_DL GPIO = 0 |
| * (arg = 2): FW_DL GPIO = 1 |
| * |
| * Return: -ENOIOCTLCMD if arg is not supported, 0 in any other case |
| */ |
| int nfc_ioctl_power_states(struct file *filp, unsigned long arg) |
| { |
| int r = 0; |
| struct nqx_dev *nqx_dev = filp->private_data; |
| |
| if (arg == 0) { |
| /* |
| * We are attempting a hardware reset so let us disable |
| * interrupts to avoid spurious notifications to upper |
| * layers. |
| */ |
| nqx_disable_irq(nqx_dev); |
| dev_dbg(&nqx_dev->client->dev, |
| "gpio_set_value disable: %s: info: %p\n", |
| __func__, nqx_dev); |
| if (gpio_is_valid(nqx_dev->firm_gpio)) |
| gpio_set_value(nqx_dev->firm_gpio, 0); |
| |
| if (gpio_is_valid(nqx_dev->ese_gpio)) { |
| if (!gpio_get_value(nqx_dev->ese_gpio)) { |
| dev_dbg(&nqx_dev->client->dev, "disabling en_gpio\n"); |
| gpio_set_value(nqx_dev->en_gpio, 0); |
| } else { |
| dev_dbg(&nqx_dev->client->dev, "keeping en_gpio high\n"); |
| } |
| } else { |
| dev_dbg(&nqx_dev->client->dev, "ese_gpio invalid, set en_gpio to low\n"); |
| gpio_set_value(nqx_dev->en_gpio, 0); |
| } |
| r = nqx_clock_deselect(nqx_dev); |
| if (r < 0) |
| dev_err(&nqx_dev->client->dev, "unable to disable clock\n"); |
| nqx_dev->nfc_ven_enabled = false; |
| /* hardware dependent delay */ |
| msleep(100); |
| } else if (arg == 1) { |
| nqx_enable_irq(nqx_dev); |
| dev_dbg(&nqx_dev->client->dev, |
| "gpio_set_value enable: %s: info: %p\n", |
| __func__, nqx_dev); |
| if (gpio_is_valid(nqx_dev->firm_gpio)) |
| gpio_set_value(nqx_dev->firm_gpio, 0); |
| gpio_set_value(nqx_dev->en_gpio, 1); |
| r = nqx_clock_select(nqx_dev); |
| if (r < 0) |
| dev_err(&nqx_dev->client->dev, "unable to enable clock\n"); |
| nqx_dev->nfc_ven_enabled = true; |
| msleep(20); |
| } else if (arg == 2) { |
| /* |
| * We are switching to Dowload Mode, toggle the enable pin |
| * in order to set the NFCC in the new mode |
| */ |
| if (gpio_is_valid(nqx_dev->ese_gpio)) { |
| if (gpio_get_value(nqx_dev->ese_gpio)) { |
| dev_err(&nqx_dev->client->dev, |
| "FW download forbidden while ese is on\n"); |
| return -EBUSY; /* Device or resource busy */ |
| } |
| } |
| gpio_set_value(nqx_dev->en_gpio, 1); |
| msleep(20); |
| if (gpio_is_valid(nqx_dev->firm_gpio)) |
| gpio_set_value(nqx_dev->firm_gpio, 1); |
| msleep(20); |
| gpio_set_value(nqx_dev->en_gpio, 0); |
| msleep(100); |
| gpio_set_value(nqx_dev->en_gpio, 1); |
| msleep(20); |
| } else { |
| r = -ENOIOCTLCMD; |
| } |
| |
| return r; |
| } |
| |
| #ifdef CONFIG_COMPAT |
| static long nfc_compat_ioctl(struct file *pfile, unsigned int cmd, |
| unsigned long arg) |
| { |
| long r = 0; |
| |
| arg = (compat_u64)arg; |
| switch (cmd) { |
| case NFC_SET_PWR: |
| nfc_ioctl_power_states(pfile, arg); |
| break; |
| case ESE_SET_PWR: |
| nqx_ese_pwr(pfile->private_data, arg); |
| break; |
| case ESE_GET_PWR: |
| nqx_ese_pwr(pfile->private_data, 3); |
| break; |
| case SET_RX_BLOCK: |
| break; |
| case SET_EMULATOR_TEST_POINT: |
| break; |
| default: |
| r = -ENOTTY; |
| } |
| return r; |
| } |
| #endif |
| |
| /* |
| * nfc_ioctl_core_reset_ntf() |
| * @filp: pointer to the file descriptor |
| * |
| * Allows callers to determine if a CORE_RESET_NTF has arrived |
| * |
| * Return: the value of variable core_reset_ntf |
| */ |
| int nfc_ioctl_core_reset_ntf(struct file *filp) |
| { |
| struct nqx_dev *nqx_dev = filp->private_data; |
| |
| dev_dbg(&nqx_dev->client->dev, "%s: returning = %d\n", __func__, |
| nqx_dev->core_reset_ntf); |
| return nqx_dev->core_reset_ntf; |
| } |
| |
| /* |
| * Inside nfc_ioctl_nfcc_info |
| * |
| * @brief nfc_ioctl_nfcc_info |
| * |
| * Check the NQ Chipset and firmware version details |
| */ |
| unsigned int nfc_ioctl_nfcc_info(struct file *filp, unsigned long arg) |
| { |
| unsigned int r = 0; |
| struct nqx_dev *nqx_dev = filp->private_data; |
| |
| r = nqx_dev->nqx_info.i; |
| dev_dbg(&nqx_dev->client->dev, |
| "nqx nfc : nfc_ioctl_nfcc_info r = %d\n", r); |
| |
| return r; |
| } |
| |
| static long nfc_ioctl(struct file *pfile, unsigned int cmd, |
| unsigned long arg) |
| { |
| int r = 0; |
| |
| switch (cmd) { |
| case NFC_SET_PWR: |
| r = nfc_ioctl_power_states(pfile, arg); |
| break; |
| case ESE_SET_PWR: |
| r = nqx_ese_pwr(pfile->private_data, arg); |
| break; |
| case ESE_GET_PWR: |
| r = nqx_ese_pwr(pfile->private_data, 3); |
| 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); |
| break; |
| case NFCC_GET_INFO: |
| r = nfc_ioctl_nfcc_info(pfile, arg); |
| break; |
| default: |
| r = -ENOIOCTLCMD; |
| } |
| return r; |
| } |
| |
| static const struct file_operations nfc_dev_fops = { |
| .owner = THIS_MODULE, |
| .llseek = no_llseek, |
| .read = nfc_read, |
| .write = nfc_write, |
| .open = nfc_open, |
| .unlocked_ioctl = nfc_ioctl, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = nfc_compat_ioctl |
| #endif |
| }; |
| |
| /* Check for availability of NQ_ NFC controller hardware */ |
| static int nfcc_hw_check(struct i2c_client *client, struct nqx_dev *nqx_dev) |
| { |
| int ret = 0; |
| |
| unsigned char raw_nci_reset_cmd[] = {0x20, 0x00, 0x01, 0x00}; |
| unsigned char raw_nci_init_cmd[] = {0x20, 0x01, 0x00}; |
| unsigned char nci_init_rsp[28]; |
| unsigned char nci_reset_rsp[6]; |
| unsigned char init_rsp_len = 0; |
| unsigned int enable_gpio = nqx_dev->en_gpio; |
| /* making sure that the NFCC starts in a clean state. */ |
| gpio_set_value(enable_gpio, 0);/* ULPM: Disable */ |
| /* hardware dependent delay */ |
| msleep(20); |
| gpio_set_value(enable_gpio, 1);/* HPD : Enable*/ |
| /* hardware dependent delay */ |
| msleep(20); |
| |
| /* send NCI CORE RESET CMD with Keep Config parameters */ |
| ret = i2c_master_send(client, raw_nci_reset_cmd, |
| sizeof(raw_nci_reset_cmd)); |
| if (ret < 0) { |
| dev_err(&client->dev, |
| "%s: - i2c_master_send Error\n", __func__); |
| goto err_nfcc_hw_check; |
| } |
| /* hardware dependent delay */ |
| msleep(30); |
| |
| /* Read Response of RESET command */ |
| ret = i2c_master_recv(client, nci_reset_rsp, |
| sizeof(nci_reset_rsp)); |
| dev_err(&client->dev, |
| "%s: - nq - reset cmd answer : NfcNciRx %x %x %x\n", |
| __func__, nci_reset_rsp[0], |
| nci_reset_rsp[1], nci_reset_rsp[2]); |
| if (ret < 0) { |
| dev_err(&client->dev, |
| "%s: - i2c_master_recv Error\n", __func__); |
| goto err_nfcc_hw_check; |
| } |
| ret = i2c_master_send(client, raw_nci_init_cmd, |
| sizeof(raw_nci_init_cmd)); |
| if (ret < 0) { |
| dev_err(&client->dev, |
| "%s: - i2c_master_send Error\n", __func__); |
| goto err_nfcc_hw_check; |
| } |
| /* hardware dependent delay */ |
| msleep(30); |
| /* Read Response of INIT command */ |
| ret = i2c_master_recv(client, nci_init_rsp, |
| sizeof(nci_init_rsp)); |
| if (ret < 0) { |
| dev_err(&client->dev, |
| "%s: - i2c_master_recv Error\n", __func__); |
| goto err_nfcc_hw_check; |
| } |
| init_rsp_len = 2 + nci_init_rsp[2]; /*payload + len*/ |
| if (init_rsp_len > PAYLOAD_HEADER_LENGTH) { |
| nqx_dev->nqx_info.info.chip_type = |
| nci_init_rsp[init_rsp_len - 3]; |
| nqx_dev->nqx_info.info.rom_version = |
| nci_init_rsp[init_rsp_len - 2]; |
| nqx_dev->nqx_info.info.fw_major = |
| nci_init_rsp[init_rsp_len - 1]; |
| nqx_dev->nqx_info.info.fw_minor = |
| nci_init_rsp[init_rsp_len]; |
| } |
| dev_dbg(&nqx_dev->client->dev, "NQ NFCC chip_type = %x\n", |
| nqx_dev->nqx_info.info.chip_type); |
| dev_dbg(&nqx_dev->client->dev, "NQ fw version = %x.%x.%x\n", |
| nqx_dev->nqx_info.info.rom_version, |
| nqx_dev->nqx_info.info.fw_major, |
| nqx_dev->nqx_info.info.fw_minor); |
| |
| switch (nqx_dev->nqx_info.info.chip_type) { |
| case NFCC_NQ_210: |
| dev_dbg(&client->dev, |
| "%s: ## NFCC == NQ210 ##\n", __func__); |
| break; |
| case NFCC_NQ_220: |
| dev_dbg(&client->dev, |
| "%s: ## NFCC == NQ220 ##\n", __func__); |
| break; |
| case NFCC_NQ_310: |
| dev_dbg(&client->dev, |
| "%s: ## NFCC == NQ310 ##\n", __func__); |
| break; |
| case NFCC_NQ_330: |
| dev_dbg(&client->dev, |
| "%s: ## NFCC == NQ330 ##\n", __func__); |
| break; |
| case NFCC_PN66T: |
| dev_dbg(&client->dev, |
| "%s: ## NFCC == PN66T ##\n", __func__); |
| break; |
| default: |
| dev_err(&client->dev, |
| "%s: - NFCC HW not Supported\n", __func__); |
| break; |
| } |
| |
| /*Disable NFC by default to save power on boot*/ |
| gpio_set_value(enable_gpio, 0);/* ULPM: Disable */ |
| ret = 0; |
| goto done; |
| |
| err_nfcc_hw_check: |
| ret = -ENXIO; |
| dev_err(&client->dev, |
| "%s: - NFCC HW not available\n", __func__); |
| done: |
| return ret; |
| } |
| |
| /* |
| * Routine to enable clock. |
| * this routine can be extended to select from multiple |
| * sources based on clk_src_name. |
| */ |
| static int nqx_clock_select(struct nqx_dev *nqx_dev) |
| { |
| int r = 0; |
| |
| nqx_dev->s_clk = clk_get(&nqx_dev->client->dev, "ref_clk"); |
| |
| if (nqx_dev->s_clk == NULL) |
| goto err_clk; |
| |
| if (nqx_dev->clk_run == false) |
| r = clk_prepare_enable(nqx_dev->s_clk); |
| |
| if (r) |
| goto err_clk; |
| |
| nqx_dev->clk_run = true; |
| |
| return r; |
| |
| err_clk: |
| r = -1; |
| return r; |
| } |
| |
| /* |
| * Routine to disable clocks |
| */ |
| static int nqx_clock_deselect(struct nqx_dev *nqx_dev) |
| { |
| int r = -1; |
| |
| if (nqx_dev->s_clk != NULL) { |
| if (nqx_dev->clk_run == true) { |
| clk_disable_unprepare(nqx_dev->s_clk); |
| nqx_dev->clk_run = false; |
| } |
| return 0; |
| } |
| return r; |
| } |
| |
| static int nfc_parse_dt(struct device *dev, struct nqx_platform_data *pdata) |
| { |
| int r = 0; |
| struct device_node *np = dev->of_node; |
| |
| pdata->en_gpio = of_get_named_gpio(np, "qcom,nq-ven", 0); |
| if ((!gpio_is_valid(pdata->en_gpio))) |
| return -EINVAL; |
| disable_ctrl = pdata->en_gpio; |
| |
| pdata->irq_gpio = of_get_named_gpio(np, "qcom,nq-irq", 0); |
| if ((!gpio_is_valid(pdata->irq_gpio))) |
| return -EINVAL; |
| |
| pdata->firm_gpio = of_get_named_gpio(np, "qcom,nq-firm", 0); |
| if (!gpio_is_valid(pdata->firm_gpio)) { |
| dev_warn(dev, |
| "FIRM GPIO <OPTIONAL> error getting from OF node\n"); |
| pdata->firm_gpio = -EINVAL; |
| } |
| |
| pdata->ese_gpio = of_get_named_gpio(np, "qcom,nq-esepwr", 0); |
| if (!gpio_is_valid(pdata->ese_gpio)) { |
| dev_warn(dev, |
| "ese GPIO <OPTIONAL> error getting from OF node\n"); |
| pdata->ese_gpio = -EINVAL; |
| } |
| |
| r = of_property_read_string(np, "qcom,clk-src", &pdata->clk_src_name); |
| |
| pdata->clkreq_gpio = of_get_named_gpio(np, "qcom,nq-clkreq", 0); |
| |
| if (r) |
| return -EINVAL; |
| return r; |
| } |
| |
| static inline int gpio_input_init(const struct device * const dev, |
| const int gpio, const char * const gpio_name) |
| { |
| int r = gpio_request(gpio, gpio_name); |
| |
| if (r) { |
| dev_err(dev, "unable to request gpio [%d]\n", gpio); |
| return r; |
| } |
| |
| r = gpio_direction_input(gpio); |
| if (r) |
| dev_err(dev, "unable to set direction for gpio [%d]\n", gpio); |
| |
| return r; |
| } |
| |
| static int nqx_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| int r = 0; |
| int irqn = 0; |
| struct nqx_platform_data *platform_data; |
| struct nqx_dev *nqx_dev; |
| |
| dev_dbg(&client->dev, "%s: enter\n", __func__); |
| if (client->dev.of_node) { |
| platform_data = devm_kzalloc(&client->dev, |
| sizeof(struct nqx_platform_data), GFP_KERNEL); |
| if (!platform_data) { |
| r = -ENOMEM; |
| goto err_platform_data; |
| } |
| r = nfc_parse_dt(&client->dev, platform_data); |
| if (r) |
| goto err_free_data; |
| } else |
| platform_data = client->dev.platform_data; |
| |
| 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__); |
| r = -ENODEV; |
| goto err_platform_data; |
| } |
| if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
| dev_err(&client->dev, "%s: need I2C_FUNC_I2C\n", __func__); |
| r = -ENODEV; |
| goto err_free_data; |
| } |
| nqx_dev = kzalloc(sizeof(*nqx_dev), GFP_KERNEL); |
| if (nqx_dev == NULL) { |
| r = -ENOMEM; |
| goto err_free_data; |
| } |
| nqx_dev->client = client; |
| nqx_dev->kbuflen = MAX_BUFFER_SIZE; |
| nqx_dev->kbuf = kzalloc(MAX_BUFFER_SIZE, GFP_KERNEL); |
| if (!nqx_dev->kbuf) { |
| dev_err(&client->dev, |
| "failed to allocate memory for nqx_dev->kbuf\n"); |
| r = -ENOMEM; |
| goto err_free_dev; |
| } |
| |
| if (gpio_is_valid(platform_data->en_gpio)) { |
| r = gpio_request(platform_data->en_gpio, "nfc_reset_gpio"); |
| if (r) { |
| dev_err(&client->dev, |
| "%s: unable to request nfc reset gpio [%d]\n", |
| __func__, |
| platform_data->en_gpio); |
| goto err_mem; |
| } |
| r = gpio_direction_output(platform_data->en_gpio, 0); |
| if (r) { |
| dev_err(&client->dev, |
| "%s: unable to set direction for nfc reset gpio [%d]\n", |
| __func__, |
| platform_data->en_gpio); |
| goto err_en_gpio; |
| } |
| } else { |
| dev_err(&client->dev, |
| "%s: nfc reset gpio not provided\n", __func__); |
| goto err_mem; |
| } |
| |
| 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 nfc irq gpio [%d]\n", |
| __func__, platform_data->irq_gpio); |
| goto err_en_gpio; |
| } |
| r = gpio_direction_input(platform_data->irq_gpio); |
| if (r) { |
| dev_err(&client->dev, |
| "%s: unable to set direction for nfc irq gpio [%d]\n", |
| __func__, |
| platform_data->irq_gpio); |
| goto err_irq_gpio; |
| } |
| irqn = gpio_to_irq(platform_data->irq_gpio); |
| if (irqn < 0) { |
| r = irqn; |
| goto err_irq_gpio; |
| } |
| client->irq = irqn; |
| } else { |
| dev_err(&client->dev, "%s: irq gpio not provided\n", __func__); |
| goto err_en_gpio; |
| } |
| if (gpio_is_valid(platform_data->firm_gpio)) { |
| r = gpio_request(platform_data->firm_gpio, |
| "nfc_firm_gpio"); |
| if (r) { |
| dev_err(&client->dev, |
| "%s: unable to request nfc firmware gpio [%d]\n", |
| __func__, platform_data->firm_gpio); |
| goto err_irq_gpio; |
| } |
| r = gpio_direction_output(platform_data->firm_gpio, 0); |
| if (r) { |
| dev_err(&client->dev, |
| "%s: cannot set direction for nfc firmware gpio [%d]\n", |
| __func__, platform_data->firm_gpio); |
| goto err_firm_gpio; |
| } |
| } else { |
| dev_err(&client->dev, |
| "%s: firm gpio not provided\n", __func__); |
| goto err_irq_gpio; |
| } |
| if (gpio_is_valid(platform_data->ese_gpio)) { |
| r = gpio_request(platform_data->ese_gpio, |
| "nfc-ese_pwr"); |
| if (r) { |
| nqx_dev->ese_gpio = -EINVAL; |
| dev_err(&client->dev, |
| "%s: unable to request nfc ese gpio [%d]\n", |
| __func__, platform_data->ese_gpio); |
| /* ese gpio optional so we should continue */ |
| } else { |
| nqx_dev->ese_gpio = platform_data->ese_gpio; |
| r = gpio_direction_output(platform_data->ese_gpio, 0); |
| if (r) { |
| /* |
| * free ese gpio and set invalid |
| * to avoid further use |
| */ |
| gpio_free(platform_data->ese_gpio); |
| nqx_dev->ese_gpio = -EINVAL; |
| dev_err(&client->dev, |
| "%s: cannot set direction for nfc ese gpio [%d]\n", |
| __func__, platform_data->ese_gpio); |
| /* ese gpio optional so we should continue */ |
| } |
| } |
| } else { |
| nqx_dev->ese_gpio = -EINVAL; |
| dev_err(&client->dev, |
| "%s: ese gpio not provided\n", __func__); |
| /* ese gpio optional so we should continue */ |
| } |
| 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 nfc clkreq gpio [%d]\n", |
| __func__, platform_data->clkreq_gpio); |
| goto err_ese_gpio; |
| } |
| r = gpio_direction_input(platform_data->clkreq_gpio); |
| if (r) { |
| dev_err(&client->dev, |
| "%s: cannot set direction for nfc clkreq 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_ese_gpio; |
| } |
| |
| nqx_dev->en_gpio = platform_data->en_gpio; |
| nqx_dev->irq_gpio = platform_data->irq_gpio; |
| nqx_dev->firm_gpio = platform_data->firm_gpio; |
| nqx_dev->clkreq_gpio = platform_data->clkreq_gpio; |
| nqx_dev->pdata = platform_data; |
| |
| /* init mutex and queues */ |
| init_waitqueue_head(&nqx_dev->read_wq); |
| mutex_init(&nqx_dev->read_mutex); |
| spin_lock_init(&nqx_dev->irq_enabled_lock); |
| |
| nqx_dev->nqx_device.minor = MISC_DYNAMIC_MINOR; |
| nqx_dev->nqx_device.name = "nq-nci"; |
| nqx_dev->nqx_device.fops = &nfc_dev_fops; |
| |
| r = misc_register(&nqx_dev->nqx_device); |
| if (r) { |
| dev_err(&client->dev, "%s: misc_register failed\n", __func__); |
| goto err_misc_register; |
| } |
| |
| /* NFC_INT IRQ */ |
| nqx_dev->irq_enabled = true; |
| r = request_irq(client->irq, nqx_dev_irq_handler, |
| IRQF_TRIGGER_HIGH, client->name, nqx_dev); |
| if (r) { |
| dev_err(&client->dev, "%s: request_irq failed\n", __func__); |
| goto err_request_irq_failed; |
| } |
| nqx_disable_irq(nqx_dev); |
| |
| /* |
| * To be efficient we need to test whether nfcc hardware is physically |
| * present before attempting further hardware initialisation. |
| * |
| */ |
| r = nfcc_hw_check(client, nqx_dev); |
| if (r) { |
| /* make sure NFCC is not enabled */ |
| gpio_set_value(platform_data->en_gpio, 0); |
| /* We don't think there is hardware switch NFC OFF */ |
| goto err_request_hw_check_failed; |
| } |
| |
| /* Register reboot notifier here */ |
| r = register_reboot_notifier(&nfcc_notifier); |
| if (r) { |
| dev_err(&client->dev, |
| "%s: cannot register reboot notifier(err = %d)\n", |
| __func__, r); |
| /* |
| * nfcc_hw_check function not doing memory |
| * allocation so using same goto target here |
| */ |
| goto err_request_hw_check_failed; |
| } |
| |
| #ifdef NFC_KERNEL_BU |
| r = nqx_clock_select(nqx_dev); |
| if (r < 0) { |
| dev_err(&client->dev, |
| "%s: nqx_clock_select failed\n", __func__); |
| goto err_clock_en_failed; |
| } |
| gpio_set_value(platform_data->en_gpio, 1); |
| #endif |
| device_init_wakeup(&client->dev, true); |
| device_set_wakeup_capable(&client->dev, true); |
| i2c_set_clientdata(client, nqx_dev); |
| nqx_dev->irq_wake_up = false; |
| |
| dev_err(&client->dev, |
| "%s: probing NFCC NQxxx exited successfully\n", |
| __func__); |
| return 0; |
| |
| #ifdef NFC_KERNEL_BU |
| err_clock_en_failed: |
| unregister_reboot_notifier(&nfcc_notifier); |
| #endif |
| err_request_hw_check_failed: |
| free_irq(client->irq, nqx_dev); |
| err_request_irq_failed: |
| misc_deregister(&nqx_dev->nqx_device); |
| err_misc_register: |
| mutex_destroy(&nqx_dev->read_mutex); |
| err_clkreq_gpio: |
| gpio_free(platform_data->clkreq_gpio); |
| err_ese_gpio: |
| /* optional gpio, not sure was configured in probe */ |
| if (nqx_dev->ese_gpio > 0) |
| gpio_free(platform_data->ese_gpio); |
| err_firm_gpio: |
| gpio_free(platform_data->firm_gpio); |
| err_irq_gpio: |
| gpio_free(platform_data->irq_gpio); |
| err_en_gpio: |
| gpio_free(platform_data->en_gpio); |
| err_mem: |
| kfree(nqx_dev->kbuf); |
| err_free_dev: |
| kfree(nqx_dev); |
| err_free_data: |
| if (client->dev.of_node) |
| devm_kfree(&client->dev, platform_data); |
| err_platform_data: |
| dev_err(&client->dev, |
| "%s: probing nqxx failed, check hardware\n", |
| __func__); |
| return r; |
| } |
| |
| static int nqx_remove(struct i2c_client *client) |
| { |
| int ret = 0; |
| struct nqx_dev *nqx_dev; |
| |
| nqx_dev = i2c_get_clientdata(client); |
| if (!nqx_dev) { |
| dev_err(&client->dev, |
| "%s: device doesn't exist anymore\n", __func__); |
| ret = -ENODEV; |
| goto err; |
| } |
| |
| unregister_reboot_notifier(&nfcc_notifier); |
| free_irq(client->irq, nqx_dev); |
| misc_deregister(&nqx_dev->nqx_device); |
| mutex_destroy(&nqx_dev->read_mutex); |
| gpio_free(nqx_dev->clkreq_gpio); |
| /* optional gpio, not sure was configured in probe */ |
| if (nqx_dev->ese_gpio > 0) |
| gpio_free(nqx_dev->ese_gpio); |
| gpio_free(nqx_dev->firm_gpio); |
| gpio_free(nqx_dev->irq_gpio); |
| gpio_free(nqx_dev->en_gpio); |
| kfree(nqx_dev->kbuf); |
| if (client->dev.of_node) |
| devm_kfree(&client->dev, nqx_dev->pdata); |
| |
| kfree(nqx_dev); |
| err: |
| return ret; |
| } |
| |
| static int nqx_suspend(struct device *device) |
| { |
| struct i2c_client *client = to_i2c_client(device); |
| struct nqx_dev *nqx_dev = i2c_get_clientdata(client); |
| |
| if (device_may_wakeup(&client->dev) && nqx_dev->irq_enabled) { |
| if (!enable_irq_wake(client->irq)) |
| nqx_dev->irq_wake_up = true; |
| } |
| return 0; |
| } |
| |
| static int nqx_resume(struct device *device) |
| { |
| struct i2c_client *client = to_i2c_client(device); |
| struct nqx_dev *nqx_dev = i2c_get_clientdata(client); |
| |
| if (device_may_wakeup(&client->dev) && nqx_dev->irq_wake_up) { |
| if (!disable_irq_wake(client->irq)) |
| nqx_dev->irq_wake_up = false; |
| } |
| return 0; |
| } |
| |
| static const struct i2c_device_id nqx_id[] = { |
| {"nqx-i2c", 0}, |
| {} |
| }; |
| |
| static const struct dev_pm_ops nfc_pm_ops = { |
| SET_SYSTEM_SLEEP_PM_OPS(nqx_suspend, nqx_resume) |
| }; |
| |
| static struct i2c_driver nqx = { |
| .id_table = nqx_id, |
| .probe = nqx_probe, |
| .remove = nqx_remove, |
| .driver = { |
| .owner = THIS_MODULE, |
| .name = "nq-nci", |
| .of_match_table = msm_match_table, |
| .pm = &nfc_pm_ops, |
| }, |
| }; |
| |
| static int nfcc_reboot(struct notifier_block *notifier, unsigned long val, |
| void *v) |
| { |
| gpio_set_value(disable_ctrl, 1); |
| return NOTIFY_OK; |
| } |
| |
| /* |
| * module load/unload record keeping |
| */ |
| static int __init nqx_dev_init(void) |
| { |
| return i2c_add_driver(&nqx); |
| } |
| module_init(nqx_dev_init); |
| |
| static void __exit nqx_dev_exit(void) |
| { |
| unregister_reboot_notifier(&nfcc_notifier); |
| i2c_del_driver(&nqx); |
| } |
| module_exit(nqx_dev_exit); |
| |
| MODULE_DESCRIPTION("NFC nqx"); |
| MODULE_LICENSE("GPL v2"); |