396 righe
11 KiB
C
396 righe
11 KiB
C
/******************************************************************************
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* Copyright (C) 2015, The Linux Foundation. All rights reserved.
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* Copyright (C) 2019-2021 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/gpio.h>
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#include <linux/of_gpio.h>
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#include <linux/delay.h>
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#include "common_ese.h"
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int nfc_parse_dt(struct device *dev, struct platform_configs *nfc_configs,
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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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struct platform_gpio *nfc_gpio = &nfc_configs->gpio;
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if (!np) {
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pr_err("%s: nfc of_node NULL\n", __func__);
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return -EINVAL;
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}
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nfc_gpio->irq = -EINVAL;
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nfc_gpio->dwl_req = -EINVAL;
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nfc_gpio->ven = -EINVAL;
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/* irq 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("%s: irq gpio invalid %d\n", __func__,
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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("%s: ven gpio invalid %d\n", __func__, nfc_gpio->ven);
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return -EINVAL;
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}
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/* some products like sn220 does not required fw dwl pin */
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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_warn("%s: dwl_req gpio invalid %d\n", __func__,
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nfc_gpio->dwl_req);
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pr_info("%s: %d, %d, %d\n", __func__, nfc_gpio->irq, nfc_gpio->ven,
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nfc_gpio->dwl_req);
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return 0;
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}
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void set_valid_gpio(int gpio, int value)
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{
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if (gpio_is_valid(gpio)) {
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pr_debug("%s: gpio %d value %d\n", __func__, gpio, value);
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gpio_set_value(gpio, value);
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/* hardware dependent delay */
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usleep_range(NFC_GPIO_SET_WAIT_TIME_US,
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NFC_GPIO_SET_WAIT_TIME_US + 100);
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}
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}
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int get_valid_gpio(int gpio)
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{
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int value = -EINVAL;
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if (gpio_is_valid(gpio)) {
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value = gpio_get_value(gpio);
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pr_debug("%s: gpio %d value %d\n", __func__, gpio, value);
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}
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return value;
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}
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void gpio_set_ven(struct nfc_dev *nfc_dev, int value)
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{
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struct platform_gpio *nfc_gpio = &nfc_dev->configs.gpio;
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if (gpio_get_value(nfc_gpio->ven) != value) {
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pr_debug("%s: value %d\n", __func__, value);
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/* reset on change in level from high to low */
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if (value)
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ese_cold_reset_release(nfc_dev);
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gpio_set_value(nfc_gpio->ven, value);
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/* hardware dependent delay */
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usleep_range(NFC_GPIO_SET_WAIT_TIME_US,
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NFC_GPIO_SET_WAIT_TIME_US + 100);
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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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pr_debug("%s: nfc o/p gpio %d level %d\n", __func__,
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gpio, gpio_get_value(gpio));
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} else {
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ret = gpio_direction_input(gpio);
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pr_debug("%s: nfc i/p gpio %d\n", __func__, gpio);
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}
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if (ret) {
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pr_err("%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("%s: unable to set irq [%d]\n", __func__,
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gpio);
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gpio_free(gpio);
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return ret;
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}
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pr_debug("%s: gpio_to_irq successful [%d]\n", __func__,
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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(struct nfc_dev *nfc_dev)
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{
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struct platform_gpio *nfc_gpio = &nfc_dev->configs.gpio;
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if (gpio_is_valid(nfc_gpio->dwl_req))
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gpio_free(nfc_gpio->dwl_req);
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if (gpio_is_valid(nfc_gpio->irq))
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gpio_free(nfc_gpio->irq);
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if (gpio_is_valid(nfc_gpio->ven))
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gpio_free(nfc_gpio->ven);
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}
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void nfc_misc_unregister(struct nfc_dev *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(struct nfc_dev *nfc_dev,
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const struct file_operations *nfc_fops, int count,
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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", __func__,
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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", __func__,
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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", __func__,
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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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/**
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* nfc_ioctl_power_states() - power control
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* @nfc_dev: nfc device data structure
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* @arg: mode that we want to move to
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*
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* Device power control. Depending on the arg value, device moves to
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* different states, refer common.h for args
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*
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* Return: -ENOIOCTLCMD if arg is not supported, 0 in any other case
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*/
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static int nfc_ioctl_power_states(struct nfc_dev *nfc_dev, unsigned long arg)
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{
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int ret = 0;
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struct platform_gpio *nfc_gpio = &nfc_dev->configs.gpio;
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if (arg == NFC_POWER_OFF) {
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/*
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* We are attempting a hardware reset so let us disable
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* interrupts to avoid spurious notifications to upper
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* layers.
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*/
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nfc_dev->nfc_disable_intr(nfc_dev);
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set_valid_gpio(nfc_gpio->dwl_req, 0);
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gpio_set_ven(nfc_dev, 0);
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nfc_dev->nfc_ven_enabled = false;
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} else if (arg == NFC_POWER_ON) {
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nfc_dev->nfc_enable_intr(nfc_dev);
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set_valid_gpio(nfc_gpio->dwl_req, 0);
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gpio_set_ven(nfc_dev, 1);
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nfc_dev->nfc_ven_enabled = true;
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} else if (arg == NFC_FW_DWL_VEN_TOGGLE) {
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/*
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* We are switching to download Mode, toggle the enable pin
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* in order to set the NFCC in the new mode
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*/
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nfc_dev->nfc_disable_intr(nfc_dev);
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set_valid_gpio(nfc_gpio->dwl_req, 1);
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nfc_dev->nfc_state = NFC_STATE_FW_DWL;
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gpio_set_ven(nfc_dev, 0);
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gpio_set_ven(nfc_dev, 1);
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nfc_dev->nfc_enable_intr(nfc_dev);
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} else if (arg == NFC_FW_DWL_HIGH) {
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/*
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* Setting firmware download gpio to HIGH
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* before FW download start
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*/
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set_valid_gpio(nfc_gpio->dwl_req, 1);
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nfc_dev->nfc_state = NFC_STATE_FW_DWL;
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} else if (arg == NFC_VEN_FORCED_HARD_RESET) {
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nfc_dev->nfc_disable_intr(nfc_dev);
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gpio_set_ven(nfc_dev, 0);
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gpio_set_ven(nfc_dev, 1);
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nfc_dev->nfc_enable_intr(nfc_dev);
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} else if (arg == NFC_FW_DWL_LOW) {
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/*
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* Setting firmware download gpio to LOW
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* FW download finished
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*/
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set_valid_gpio(nfc_gpio->dwl_req, 0);
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nfc_dev->nfc_state = NFC_STATE_NCI;
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} else {
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pr_err("%s: bad arg %lu\n", __func__, arg);
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ret = -ENOIOCTLCMD;
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}
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return ret;
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}
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/**
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* nfc_dev_ioctl - used to set or get data from upper layer.
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* @pfile file node for opened device.
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* @cmd ioctl type from upper layer.
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* @arg ioctl arg from upper layer.
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*
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* NFC and ESE Device power control, based on the argument value
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*
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* Return: -ENOIOCTLCMD if arg is not supported, 0 or other in any other case
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*/
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long nfc_dev_ioctl(struct file *pfile, unsigned int cmd, unsigned long arg)
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{
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int ret = 0;
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struct nfc_dev *nfc_dev = pfile->private_data;
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if (!nfc_dev)
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return -ENODEV;
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pr_debug("%s: cmd = %x arg = %zx\n", __func__, cmd, arg);
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switch (cmd) {
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case NFC_SET_PWR:
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ret = nfc_ioctl_power_states(nfc_dev, arg);
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break;
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case ESE_SET_PWR:
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ret = nfc_ese_pwr(nfc_dev, arg);
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break;
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case ESE_GET_PWR:
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ret = nfc_ese_pwr(nfc_dev, ESE_POWER_STATE);
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break;
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default:
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pr_err("%s: bad cmd %lu\n", __func__, arg);
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ret = -ENOIOCTLCMD;
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};
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return ret;
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}
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int nfc_dev_open(struct inode *inode, struct file *filp)
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{
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struct nfc_dev *nfc_dev =
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container_of(inode->i_cdev, struct nfc_dev, c_dev);
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if (!nfc_dev)
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return -ENODEV;
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pr_debug("%s: %d, %d\n", __func__, imajor(inode), iminor(inode));
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mutex_lock(&nfc_dev->dev_ref_mutex);
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filp->private_data = nfc_dev;
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if (nfc_dev->dev_ref_count == 0) {
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set_valid_gpio(nfc_dev->configs.gpio.dwl_req, 0);
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nfc_dev->nfc_enable_intr(nfc_dev);
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}
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nfc_dev->dev_ref_count = nfc_dev->dev_ref_count + 1;
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mutex_unlock(&nfc_dev->dev_ref_mutex);
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return 0;
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}
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int nfc_dev_close(struct inode *inode, struct file *filp)
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{
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struct nfc_dev *nfc_dev =
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container_of(inode->i_cdev, struct nfc_dev, c_dev);
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if (!nfc_dev)
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return -ENODEV;
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pr_debug("%s: %d, %d\n", __func__, imajor(inode), iminor(inode));
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mutex_lock(&nfc_dev->dev_ref_mutex);
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if (nfc_dev->dev_ref_count == 1) {
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nfc_dev->nfc_disable_intr(nfc_dev);
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set_valid_gpio(nfc_dev->configs.gpio.dwl_req, 0);
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}
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if (nfc_dev->dev_ref_count > 0)
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nfc_dev->dev_ref_count = nfc_dev->dev_ref_count - 1;
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else {
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/*
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* Use "ESE_RST_PROT_DIS" as argument
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* if eSE calls flow is via NFC driver
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* i.e. direct calls from SPI HAL to NFC driver
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*/
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nfc_ese_pwr(nfc_dev, ESE_RST_PROT_DIS_NFC);
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}
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filp->private_data = NULL;
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mutex_unlock(&nfc_dev->dev_ref_mutex);
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return 0;
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}
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int validate_nfc_state_nci(struct nfc_dev *nfc_dev)
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{
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struct platform_gpio *nfc_gpio = &nfc_dev->configs.gpio;
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if (!gpio_get_value(nfc_gpio->ven)) {
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pr_err("%s: ven low - nfcc powered off\n", __func__);
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return -ENODEV;
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}
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if (get_valid_gpio(nfc_gpio->dwl_req) == 1) {
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pr_err("%s: fw download in-progress\n", __func__);
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return -EBUSY;
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}
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if (nfc_dev->nfc_state != NFC_STATE_NCI) {
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pr_err("%s: fw download state\n", __func__);
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return -EBUSY;
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}
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return 0;
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}
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