Updated corresponding to - NFC_AR_00_6000_11.01.00_OpnSrc
This commit is contained in:
Nanjesh
667
nfc/common.c
Normal file
667
nfc/common.c
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@@ -0,0 +1,667 @@
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/******************************************************************************
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* Copyright (C) 2019-2020 NXP
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* *
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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******************************************************************************/
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#include <linux/of_gpio.h>
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#include <linux/of_device.h>
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#include <linux/delay.h>
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#include "../nfc/cold_reset.h"
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#include "common.h"
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nfc_dev_t *nfc_dev_platform = NULL;
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int nfc_parse_dt(struct device *dev, platform_gpio_t *nfc_gpio,
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uint8_t interface)
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{
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struct device_node *np = dev->of_node;
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if (!np) {
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pr_err("nfc of_node NULL\n");
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return -EINVAL;
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}
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//required for i2c based chips only
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if (interface == PLATFORM_IF_I2C) {
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nfc_gpio->irq = of_get_named_gpio(np, DTS_IRQ_GPIO_STR, 0);
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if ((!gpio_is_valid(nfc_gpio->irq))) {
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pr_err("nfc irq gpio invalid %d\n", nfc_gpio->irq);
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return -EINVAL;
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}
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pr_info("%s: irq %d\n", __func__, nfc_gpio->irq);
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}
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nfc_gpio->ven = of_get_named_gpio(np, DTS_VEN_GPIO_STR, 0);
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if ((!gpio_is_valid(nfc_gpio->ven))) {
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pr_err("nfc ven gpio invalid %d\n", nfc_gpio->ven);
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return -EINVAL;
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}
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nfc_gpio->dwl_req = of_get_named_gpio(np, DTS_FWDN_GPIO_STR, 0);
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if ((!gpio_is_valid(nfc_gpio->dwl_req))) {
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pr_err("nfc dwl_req gpio invalid %d\n", nfc_gpio->dwl_req);
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return -EINVAL;
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}
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//required for old platform only
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nfc_gpio->ese_pwr = of_get_named_gpio(np, DTS_ESE_GPIO_STR, 0);
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if ((!gpio_is_valid(nfc_gpio->ese_pwr))) {
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pr_err("nfc ese_pwr gpio invalid %d\n", nfc_gpio->ese_pwr);
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nfc_gpio->ese_pwr = -EINVAL;
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}
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pr_info("%s: %d, %d, %d, %d\n", __func__,
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nfc_gpio->irq, nfc_gpio->ven, nfc_gpio->dwl_req,
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nfc_gpio->ese_pwr);
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return 0;
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}
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void gpio_set_ven(nfc_dev_t *nfc_dev, int value)
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{
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if (nfc_dev->ven_policy == VEN_ALWAYS_ENABLED) {
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value |= 1;
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}
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if (gpio_get_value(nfc_dev->gpio.ven) != value) {
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gpio_set_value(nfc_dev->gpio.ven, value);
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/* hardware dependent delay */
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usleep_range(10000, 10100);
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}
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}
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int configure_gpio(unsigned int gpio, int flag)
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{
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int ret;
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pr_debug("%s: nfc gpio [%d] flag [%01x]\n", __func__, gpio, flag);
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if (gpio_is_valid(gpio)) {
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ret = gpio_request(gpio, "nfc_gpio");
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if (ret) {
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pr_err("%s: unable to request nfc gpio [%d]\n",
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__func__, gpio);
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return ret;
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}
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/*set direction and value for output pin */
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if (flag & GPIO_OUTPUT)
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ret = gpio_direction_output(gpio, (GPIO_HIGH & flag));
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else
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ret = gpio_direction_input(gpio);
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if (ret) {
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pr_err
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("%s: unable to set direction for nfc gpio [%d]\n",
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__func__, gpio);
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gpio_free(gpio);
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return ret;
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}
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/*Consider value as control for input IRQ pin */
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if (flag & GPIO_IRQ) {
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ret = gpio_to_irq(gpio);
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if (ret < 0) {
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pr_err
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("%s: unable to set irq for nfc gpio [%d]\n",
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__func__, gpio);
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gpio_free(gpio);
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return ret;
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}
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pr_debug
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("%s: gpio_to_irq successful [%d]\n",
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__func__, gpio);
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return ret;
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}
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} else {
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pr_err("%s: invalid gpio\n", __func__);
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ret = -EINVAL;
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}
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return ret;
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}
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void gpio_free_all(nfc_dev_t *nfc_dev)
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{
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if (gpio_is_valid(nfc_dev->gpio.ese_pwr)) {
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gpio_free(nfc_dev->gpio.ese_pwr);
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}
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if (gpio_is_valid(nfc_dev->gpio.dwl_req)) {
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gpio_free(nfc_dev->gpio.dwl_req);
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}
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if (gpio_is_valid(nfc_dev->gpio.irq)) {
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gpio_free(nfc_dev->gpio.irq);
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}
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if (gpio_is_valid(nfc_dev->gpio.ven)) {
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gpio_free(nfc_dev->gpio.ven);
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}
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}
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void nfc_misc_unregister(nfc_dev_t *nfc_dev, int count)
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{
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pr_debug("%s: entry\n", __func__);
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device_destroy(nfc_dev->nfc_class, nfc_dev->devno);
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cdev_del(&nfc_dev->c_dev);
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class_destroy(nfc_dev->nfc_class);
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unregister_chrdev_region(nfc_dev->devno, count);
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}
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int nfc_misc_register(nfc_dev_t *nfc_dev,
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const struct file_operations *nfc_fops,
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int count, char *devname, char *classname)
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{
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int ret = 0;
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ret = alloc_chrdev_region(&nfc_dev->devno, 0, count, devname);
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if (ret < 0) {
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pr_err("%s: failed to alloc chrdev region ret %d\n",
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__func__, ret);
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return ret;
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}
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nfc_dev->nfc_class = class_create(THIS_MODULE, classname);
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if (IS_ERR(nfc_dev->nfc_class)) {
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ret = PTR_ERR(nfc_dev->nfc_class);
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pr_err("%s: failed to register device class ret %d\n",
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__func__, ret);
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unregister_chrdev_region(nfc_dev->devno, count);
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return ret;
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}
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cdev_init(&nfc_dev->c_dev, nfc_fops);
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ret = cdev_add(&nfc_dev->c_dev, nfc_dev->devno, count);
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if (ret < 0) {
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pr_err("%s: failed to add cdev ret %d\n", __func__, ret);
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class_destroy(nfc_dev->nfc_class);
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unregister_chrdev_region(nfc_dev->devno, count);
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return ret;
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}
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nfc_dev->nfc_device = device_create(nfc_dev->nfc_class, NULL,
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nfc_dev->devno, nfc_dev, devname);
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if (IS_ERR(nfc_dev->nfc_device)) {
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ret = PTR_ERR(nfc_dev->nfc_device);
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pr_err("%s: failed to create the device ret %d\n",
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__func__, ret);
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cdev_del(&nfc_dev->c_dev);
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class_destroy(nfc_dev->nfc_class);
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unregister_chrdev_region(nfc_dev->devno, count);
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return ret;
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}
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return 0;
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}
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static void enable_interrupt(nfc_dev_t *nfc_dev)
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{
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if (nfc_dev->interface == PLATFORM_IF_I2C)
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i2c_enable_irq(&nfc_dev->i2c_dev);
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else {
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#ifdef CONFIG_NXP_NFC_I3C
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i3c_enable_ibi(&nfc_dev->i3c_dev);
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#endif //CONFIG_NXP_NFC_I3C
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}
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}
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static void disable_interrupt(nfc_dev_t *nfc_dev)
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{
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if (nfc_dev->interface == PLATFORM_IF_I2C)
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i2c_disable_irq(&nfc_dev->i2c_dev);
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else {
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#ifdef CONFIG_NXP_NFC_I3C
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i3c_disable_ibi(&nfc_dev->i3c_dev);
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#endif //CONFIG_NXP_NFC_I3C
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}
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}
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static int send_cold_reset_cmd(nfc_dev_t *nfc_dev)
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{
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int ret = 0;
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char cmd[COLD_RESET_CMD_LEN];
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cmd[0] = COLD_RESET_CMD_GID;
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cmd[1] = COLD_RESET_OID;
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cmd[2] = COLD_RESET_CMD_PAYLOAD_LEN;
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if (nfc_dev->interface == PLATFORM_IF_I2C) {
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ret = i2c_write(&nfc_dev->i2c_dev, cmd,
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COLD_RESET_CMD_LEN, MAX_RETRY_COUNT);
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} else {
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//TODO: Handling Cold reset for I3C
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//ret = i3c_write(nfc_dev->i3c_dev, cmd, COLD_RESET_CMD_LEN);
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}
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if (ret != COLD_RESET_CMD_LEN) {
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pr_err("%s : i2c_master_send returned %d\n", __func__, ret);
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nfc_dev->cold_reset.timer_started = false;
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return -EIO;
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}
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pr_info("%s: NxpNciX: %d > %02X%02X%02X \n", __func__, ret, cmd[0],
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cmd[1], cmd[2]);
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return ret;
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}
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void read_cold_reset_rsp(nfc_dev_t *nfc_dev, char *buf)
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{
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int ret = -1;
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char rsp[COLD_RESET_RSP_LEN];
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i2c_dev_t *i2c_dev = &nfc_dev->i2c_dev;
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cold_reset_t *cold_reset = &nfc_dev->cold_reset;
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cold_reset->status = -EIO;
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/*
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* read header also if NFC is disabled
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* for enable case, will be taken care by nfc read thread
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*/
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if (!cold_reset->nfc_enabled) {
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if (nfc_dev->interface == PLATFORM_IF_I2C) {
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ret = i2c_read(i2c_dev, rsp, NCI_HDR_LEN);
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} else {
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//TODO: Handling Cold reset for I3C
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//ret = i3c_read(i3c_dev, rsp, NCI_HDR_LEN);
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}
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if (ret != NCI_HDR_LEN) {
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pr_err("%s: failure to read cold reset rsp header\n",
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__func__);
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return;
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}
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} else {
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memcpy(rsp, buf, NCI_HDR_LEN);
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}
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if ((NCI_HDR_LEN + rsp[NCI_PAYLOAD_LEN_OFFSET]) != COLD_RESET_RSP_LEN) {
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pr_err("%s: - invalid response for cold_reset\n", __func__);
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return;
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}
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if (nfc_dev->interface == PLATFORM_IF_I2C) {
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ret = i2c_read(i2c_dev, &rsp[NCI_PAYLOAD_IDX], rsp[2]);
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} else {
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//TODO:Handling Cold Reset for I3C
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//ret = i3c_read(nfc_dev->i3c_dev, &rsp[NCI_PAYLOAD_IDX], rsp[2]);
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}
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if (ret != rsp[2]) {
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pr_err("%s: failure to read cold reset rsp header\n", __func__);
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return;
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}
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pr_info("%s NxpNciR : len = 4 > %02X%02X%02X%02X\n", __func__, rsp[0],
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rsp[1], rsp[2], rsp[3]);
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cold_reset->status = rsp[NCI_PAYLOAD_IDX];
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}
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4,14,0)
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static void ese_cold_reset_gaurd_timer_callback(unsigned long data)
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{
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(void)data;
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#else
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static void ese_cold_reset_gaurd_timer_callback(struct timer_list *unused)
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{
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#endif
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pr_info("%s: Enter\n",__func__);
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nfc_dev_platform->cold_reset.timer_started = false;
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return;
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}
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static long start_ese_cold_reset_guard_timer(void)
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{
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long ret = -EINVAL;
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if (timer_pending(&nfc_dev_platform->cold_reset.timer) == 1) {
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pr_info("ese_cold_reset_guard_timer: delete pending timer \n");
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/* delete timer if already pending */
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del_timer(&nfc_dev_platform->cold_reset.timer);
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}
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nfc_dev_platform->cold_reset.timer_started = true;
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4,14,0)
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init_timer(&nfc_dev_platform->cold_reset.timer);
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setup_timer( &nfc_dev_platform->cold_reset.timer, ese_cold_reset_gaurd_timer_callback, 0);
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#else
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timer_setup(&nfc_dev_platform->cold_reset.timer, ese_cold_reset_gaurd_timer_callback, 0);
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#endif
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ret = mod_timer(&nfc_dev_platform->cold_reset.timer,
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jiffies + msecs_to_jiffies(ESE_COLD_RESET_GUARD_TIME));
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return ret;
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}
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static int perform_ese_cold_reset(nfc_dev_t *nfc_dev,
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ese_cold_reset_origin_t origin)
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{
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int ret = 0;
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if (gpio_get_value(nfc_dev->gpio.dwl_req)) {
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pr_err("FW download in-progress\n");
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return -EBUSY;
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}
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if (!gpio_get_value(nfc_dev->gpio.ven)) {
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pr_err("VEN LOW - NFCC powered off\n");
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return -ENODEV;
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}
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mutex_lock(&nfc_dev->cold_reset.sync_mutex);
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if (!nfc_dev->cold_reset.timer_started) {
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ret = start_ese_cold_reset_guard_timer();
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if (ret) {
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pr_err("%s: Error in mod_timer\n", __func__);
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mutex_unlock(&nfc_dev->cold_reset.sync_mutex);
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return ret;
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}
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/* set default value for status as failure */
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nfc_dev->cold_reset.status = -EIO;
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ret = send_cold_reset_cmd(nfc_dev);
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if (ret <= 0) {
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pr_err("failed to send cold reset command\n");
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mutex_unlock(&nfc_dev->cold_reset.sync_mutex);
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return ret;
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}
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ret = 0;
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nfc_dev->cold_reset.rsp_pending = true;
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/* check if NFC is enabled */
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if (nfc_dev->cold_reset.nfc_enabled) {
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/* Pending read from NFC_HAL will read the cold reset rsp and signal read_wq */
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if (!wait_event_interruptible_timeout
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(nfc_dev->cold_reset.read_wq,
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nfc_dev->cold_reset.rsp_pending == false,
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msecs_to_jiffies(ESE_COLD_RESET_CMD_RSP_TIMEOUT)))
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{
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pr_err("%s:Cold Reset Response Timeout\n",
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__func__);
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}
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} else {
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/* Read data as NFC thread is not active */
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enable_interrupt(nfc_dev);
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read_cold_reset_rsp(nfc_dev, NULL);
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nfc_dev->cold_reset.rsp_pending = false;
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// TODO: Handling Cold reset for I3C
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// ret = i3c_read(i3c_dev, rsp, NCI_HDR_LEN);
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}
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if (!ret) { /* wait for reboot guard timer */
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if (wait_event_interruptible_timeout
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(nfc_dev->cold_reset.read_wq, true,
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msecs_to_jiffies(ESE_COLD_RESET_REBOOT_GUARD_TIME))
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== 0) {
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pr_err("%s: guard Timeout interrupted",
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__func__);
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}
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}
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}
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mutex_unlock(&nfc_dev->cold_reset.sync_mutex);
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if (ret == 0) /* success case */
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ret = nfc_dev->cold_reset.status;
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return ret;
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}
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/*
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* Power management of the eSE
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* eSE and NFCC both are powered using VEN gpio,
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* VEN HIGH - eSE and NFCC both are powered on
|
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* VEN LOW - eSE and NFCC both are power down
|
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*/
|
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int nfc_ese_pwr(nfc_dev_t *nfc_dev, unsigned long arg)
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{
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int ret = 0;
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||||
if (arg == ESE_POWER_ON) {
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/**
|
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* Let's store the NFC VEN pin state
|
||||
* will check stored value in case of eSE power off request,
|
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* to find out if NFC MW also sent request to set VEN HIGH
|
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* VEN state will remain HIGH if NFC is enabled otherwise
|
||||
* it will be set as LOW
|
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*/
|
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nfc_dev->nfc_ven_enabled = gpio_get_value(nfc_dev->gpio.ven);
|
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if (!nfc_dev->nfc_ven_enabled) {
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pr_debug("eSE HAL service setting ven HIGH\n");
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gpio_set_ven(nfc_dev, 1);
|
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} else {
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pr_debug("ven already HIGH\n");
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}
|
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} else if (arg == ESE_POWER_OFF) {
|
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if (!nfc_dev->nfc_ven_enabled) {
|
||||
pr_debug("NFC not enabled, disabling ven\n");
|
||||
gpio_set_ven(nfc_dev, 0);
|
||||
} else {
|
||||
pr_debug("keep ven high as NFC is enabled\n");
|
||||
}
|
||||
} else if (IS_COLD_RESET_REQ(arg) &&
|
||||
nfc_dev->interface == PLATFORM_IF_I2C) {
|
||||
ret = perform_ese_cold_reset(nfc_dev, arg);
|
||||
} else if (arg == ESE_POWER_STATE) {
|
||||
// eSE power state
|
||||
ret = gpio_get_value(nfc_dev->gpio.ven);
|
||||
} else {
|
||||
pr_err("%s bad arg %lu\n", __func__, arg);
|
||||
ret = -ENOIOCTLCMD;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(nfc_ese_pwr);
|
||||
|
||||
/*
|
||||
* This function shall be called from SPI, UWB, NFC driver to perform eSE cold reset.
|
||||
*/
|
||||
int ese_cold_reset(ese_cold_reset_origin_t origin)
|
||||
{
|
||||
int ret = 0;
|
||||
unsigned long arg;
|
||||
pr_info("%s: Enter origin:%d", __func__, origin);
|
||||
|
||||
switch (origin) {
|
||||
case ESE_COLD_RESET_SOURCE_SPI:
|
||||
arg = ESE_COLD_RESET_SPI;
|
||||
break;
|
||||
case ESE_COLD_RESET_SOURCE_UWB:
|
||||
arg = ESE_COLD_RESET_UWB;
|
||||
break;
|
||||
default:
|
||||
pr_info("%s: Invalid argument", __func__);
|
||||
return -EINVAL;
|
||||
}
|
||||
if (nfc_dev_platform == NULL)
|
||||
return -ENODEV;
|
||||
ret = nfc_ese_pwr(nfc_dev_platform, arg);
|
||||
pr_info("%s:%d exit, Status:%d", __func__, origin, ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(ese_cold_reset);
|
||||
|
||||
/*
|
||||
* 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
|
||||
*/
|
||||
static int nfc_ioctl_power_states(nfc_dev_t *nfc_dev, unsigned long arg)
|
||||
{
|
||||
int ret = 0;
|
||||
if (arg == NFC_POWER_OFF) {
|
||||
/*
|
||||
* We are attempting a hardware reset so let us disable
|
||||
* interrupts to avoid spurious notifications to upper
|
||||
* layers.
|
||||
*/
|
||||
disable_interrupt(nfc_dev);
|
||||
pr_debug("gpio firm disable\n");
|
||||
if (gpio_is_valid(nfc_dev->gpio.dwl_req)) {
|
||||
gpio_set_value(nfc_dev->gpio.dwl_req, 0);
|
||||
usleep_range(10000, 10100);
|
||||
}
|
||||
if (gpio_is_valid(nfc_dev->gpio.ese_pwr)) {
|
||||
if (!gpio_get_value(nfc_dev->gpio.ese_pwr)) {
|
||||
pr_debug("disabling ven\n");
|
||||
gpio_set_ven(nfc_dev, 0);
|
||||
} else {
|
||||
pr_debug("keeping ven high\n");
|
||||
}
|
||||
} else {
|
||||
pr_debug("ese_pwr invalid, set ven to low\n");
|
||||
gpio_set_ven(nfc_dev, 0);
|
||||
}
|
||||
nfc_dev->nfc_ven_enabled = false;
|
||||
} else if (arg == NFC_POWER_ON) {
|
||||
enable_interrupt(nfc_dev);
|
||||
pr_debug("gpio_set_value enable: %s:\n", __func__);
|
||||
if (gpio_is_valid(nfc_dev->gpio.dwl_req)) {
|
||||
gpio_set_value(nfc_dev->gpio.dwl_req, 0);
|
||||
usleep_range(10000, 10100);
|
||||
}
|
||||
gpio_set_ven(nfc_dev, 1);
|
||||
nfc_dev->nfc_ven_enabled = true;
|
||||
#ifdef CONFIG_NXP_NFC_I3C
|
||||
if (nfc_dev->interface == PLATFORM_IF_I3C)
|
||||
nfc_dev->i3c_dev.read_hdr = NCI_HDR_LEN;
|
||||
#endif //CONFIG_NXP_NFC_I3C
|
||||
} else if (arg == NFC_FW_DWL_VEN_TOGGLE) {
|
||||
/*
|
||||
* We are switching to Dowload Mode, toggle the enable pin
|
||||
* in order to set the NFCC in the new mode
|
||||
*/
|
||||
if (gpio_is_valid(nfc_dev->gpio.ese_pwr)) {
|
||||
if (gpio_get_value(nfc_dev->gpio.ese_pwr)) {
|
||||
pr_err
|
||||
("FW download forbidden while ese is on\n");
|
||||
return -EBUSY; /* Device or resource busy */
|
||||
}
|
||||
}
|
||||
gpio_set_value(nfc_dev->gpio.ven, 1);
|
||||
if (gpio_is_valid(nfc_dev->gpio.dwl_req)) {
|
||||
gpio_set_value(nfc_dev->gpio.dwl_req, 1);
|
||||
usleep_range(10000, 10100);
|
||||
}
|
||||
if (nfc_dev->interface == PLATFORM_IF_I2C) {
|
||||
gpio_set_value(nfc_dev->gpio.ven, 0);
|
||||
usleep_range(10000, 10100);
|
||||
}
|
||||
gpio_set_value(nfc_dev->gpio.ven, 1);
|
||||
usleep_range(10000, 10100);
|
||||
} else if (arg == NFC_FW_DWL_HIGH) {
|
||||
/*
|
||||
* Setting firmware download gpio to HIGH
|
||||
* before FW download start
|
||||
*/
|
||||
pr_debug("set fw gpio high\n");
|
||||
if (gpio_is_valid(nfc_dev->gpio.dwl_req)) {
|
||||
gpio_set_value(nfc_dev->gpio.dwl_req, 1);
|
||||
usleep_range(10000, 10100);
|
||||
} else
|
||||
pr_debug("gpio.dwl_req is invalid\n");
|
||||
} else if (arg == NFC_VEN_FORCED_HARD_RESET
|
||||
&& nfc_dev->interface == PLATFORM_IF_I2C) {
|
||||
/*
|
||||
* TODO: Enable Ven reset for I3C, after hot join integration
|
||||
*/
|
||||
gpio_set_value(nfc_dev->gpio.ven, 0);
|
||||
usleep_range(10000, 10100);
|
||||
gpio_set_value(nfc_dev->gpio.ven, 1);
|
||||
usleep_range(10000, 10100);
|
||||
pr_info("%s VEN forced reset done\n", __func__);
|
||||
} else if (arg == NFC_FW_DWL_LOW) {
|
||||
/*
|
||||
* Setting firmware download gpio to LOW
|
||||
* FW download finished
|
||||
*/
|
||||
pr_debug("set fw gpio LOW\n");
|
||||
if (gpio_is_valid(nfc_dev->gpio.dwl_req)) {
|
||||
gpio_set_value(nfc_dev->gpio.dwl_req, 0);
|
||||
usleep_range(10000, 10100);
|
||||
} else {
|
||||
pr_debug("gpio.dwl_req is invalid\n");
|
||||
}
|
||||
#ifdef CONFIG_NXP_NFC_I3C
|
||||
if (nfc_dev->interface == PLATFORM_IF_I3C)
|
||||
nfc_dev->i3c_dev.read_hdr = NCI_HDR_LEN;
|
||||
#endif //CONFIG_NXP_NFC_I3C
|
||||
#ifdef CONFIG_NXP_NFC_I3C
|
||||
} else if (arg == NFC_FW_HDR_LEN) {
|
||||
if (nfc_dev->interface == PLATFORM_IF_I3C)
|
||||
nfc_dev->i3c_dev.read_hdr = FW_HDR_LEN;
|
||||
#endif //CONFIG_NXP_NFC_I3C
|
||||
} else {
|
||||
pr_err("%s bad arg %lu\n", __func__, arg);
|
||||
ret = -ENOIOCTLCMD;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
/** @brief IOCTL function to be used to set or get data from upper layer.
|
||||
*
|
||||
* @param pfile fil node for opened device.
|
||||
* @cmd IOCTL type from upper layer.
|
||||
* @arg IOCTL arg from upper layer.
|
||||
*
|
||||
* @return 0 on success, error code for failures.
|
||||
*/
|
||||
long nfc_dev_ioctl(struct file *pfile, unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
int ret = 0;
|
||||
struct nfc_dev *nfc_dev = pfile->private_data;
|
||||
if (!nfc_dev)
|
||||
return -ENODEV;
|
||||
|
||||
pr_debug("%s cmd = %x arg = %zx\n", __func__, cmd, arg);
|
||||
switch (cmd) {
|
||||
case NFC_SET_PWR:
|
||||
ret = nfc_ioctl_power_states(nfc_dev, arg);
|
||||
break;
|
||||
case ESE_SET_PWR:
|
||||
ret = nfc_ese_pwr(nfc_dev, arg);
|
||||
break;
|
||||
case ESE_GET_PWR:
|
||||
ret = nfc_ese_pwr(nfc_dev, 3);
|
||||
break;
|
||||
case NFC_GET_PLATFORM_TYPE:
|
||||
ret = nfc_dev->interface;
|
||||
break;
|
||||
default:
|
||||
pr_err("%s bad cmd %lu\n", __func__, arg);
|
||||
ret = -ENOIOCTLCMD;
|
||||
};
|
||||
return ret;
|
||||
}
|
||||
|
||||
int nfc_dev_open(struct inode *inode, struct file *filp)
|
||||
{
|
||||
nfc_dev_t *nfc_dev = container_of(inode->i_cdev, nfc_dev_t, c_dev);
|
||||
if (!nfc_dev)
|
||||
return -ENODEV;
|
||||
pr_debug("%s: %d, %d\n", __func__, imajor(inode), iminor(inode));
|
||||
|
||||
mutex_lock(&nfc_dev->dev_ref_mutex);
|
||||
|
||||
filp->private_data = nfc_dev;
|
||||
|
||||
if (nfc_dev->dev_ref_count == 0) {
|
||||
if (gpio_is_valid(nfc_dev->gpio.dwl_req)) {
|
||||
gpio_set_value(nfc_dev->gpio.dwl_req, 0);
|
||||
usleep_range(10000, 10100);
|
||||
}
|
||||
nfc_dev->cold_reset.nfc_enabled = true;
|
||||
enable_interrupt(nfc_dev);
|
||||
}
|
||||
nfc_dev->dev_ref_count = nfc_dev->dev_ref_count + 1;
|
||||
mutex_unlock(&nfc_dev->dev_ref_mutex);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int nfc_dev_close(struct inode *inode, struct file *filp)
|
||||
{
|
||||
nfc_dev_t *nfc_dev = container_of(inode->i_cdev, nfc_dev_t, c_dev);
|
||||
if (!nfc_dev)
|
||||
return -ENODEV;
|
||||
pr_debug("%s: %d, %d\n", __func__, imajor(inode), iminor(inode));
|
||||
mutex_lock(&nfc_dev->dev_ref_mutex);
|
||||
if (nfc_dev->dev_ref_count == 1) {
|
||||
disable_interrupt(nfc_dev);
|
||||
if (gpio_is_valid(nfc_dev->gpio.dwl_req)) {
|
||||
gpio_set_value(nfc_dev->gpio.dwl_req, 0);
|
||||
usleep_range(10000, 10100);
|
||||
}
|
||||
nfc_dev->cold_reset.nfc_enabled = false;
|
||||
}
|
||||
if (nfc_dev->dev_ref_count > 0)
|
||||
nfc_dev->dev_ref_count = nfc_dev->dev_ref_count - 1;
|
||||
|
||||
filp->private_data = NULL;
|
||||
|
||||
mutex_unlock(&nfc_dev->dev_ref_mutex);
|
||||
return 0;
|
||||
}
|
||||
Reference in New Issue
Block a user