Merge "NFC: Add driver to configure NFC-I3C controller GPIOs" (15db89de) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/nfc/Kconfig

+10 −1

Original line number	Diff line number	Diff line
		@@ -71,9 +71,18 @@ config NFC_QTI_I2C

		If unsure, say N.

		config NFC_QTI_I3C_GPIO
		tristate "QTI Driver to configure NFC GPIOs for SNxxx I3C modules"
		help
		This enables the QTI driver for SNxxx I3C based devices.
		NFC Enable GPIO(NFC_EN) should toggle before I3C enumeration so that NFC
		controller gets recognized.

		If unsure, say N.

		config NFC_QTI_I3C
		tristate "QTI NCI based NFC I3C Slave Driver for SNxxx"
		depends on I3C
		depends on I3C && NFC_QTI_I3C_GPIO
		help
		This enables the NFC driver for SNxxx based devices.
		This is for I3C connected version. NCI protocol logic

drivers/nfc/qti/Makefile

+2 −0

Original line number	Diff line number	Diff line
		@@ -8,3 +8,5 @@ nfc_i2c-objs:= nfc_common.o nfc_i2c_drv.o

		obj-$(CONFIG_NFC_QTI_I3C) += nfc_i3c.o
		nfc_i3c-objs:= nfc_common.o nfc_i3c_drv.o

		obj-$(CONFIG_NFC_QTI_I3C_GPIO) += nfc_i3c_gpio_cfg.o

drivers/nfc/qti/nfc_i3c_gpio_cfg.c

0 → 100644

+102 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0-only
		/*
		* Copyright (c) 2020, The Linux Foundation. All rights reserved.
		*/

		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/of_gpio.h>
		#include <linux/of_device.h>
		#include <linux/delay.h>

		/* NFC I3C DT node name */
		#define NFC_I3C_DT_NODE_STR "sn"

		/* NFC GPIO names in the I3C slave node */
		#define DTS_VEN_GPIO_STR "qcom,sn-ven"
		#define DTS_FWDN_GPIO_STR "qcom,sn-firm"

		static int __init nfc_i3c_gpio_cfg_init(void)
		{
		int ret = 0;
		int ven_gpio = 0, firm_gpio = 0;
		struct device_node *np = NULL;

		pr_debug("%s\n", __func__);

		np = of_find_node_by_name(NULL, NFC_I3C_DT_NODE_STR);
		if (!np) {
		pr_err("finding NFC I3C slave node failed\n");
		return -ENODEV;
		}

		ven_gpio = of_get_named_gpio(np, DTS_VEN_GPIO_STR, 0);
		pr_debug("NFC VEN %d\n", ven_gpio);

		if ((!gpio_is_valid(ven_gpio))) {
		pr_err("invalid ven gpio %d from dt\n", ven_gpio);
		return -EINVAL;
		}

		firm_gpio = of_get_named_gpio(np, DTS_FWDN_GPIO_STR, 0);
		pr_debug("NFC FIRM GPIO %d\n", firm_gpio);

		if ((!gpio_is_valid(firm_gpio))) {
		pr_err("invalid firm gpio %d from dt\n", firm_gpio);
		return -EINVAL;
		}

		ret = gpio_request(firm_gpio, "nfc_fw_gpio");
		if (ret) {
		pr_err("NFC firm gpio request failed ret %d\n", ret);
		return -EIO;
		}

		ret = gpio_direction_output(firm_gpio, 0);
		if (ret) {
		pr_err("NFC firm gpio direction set failed ret %d\n", ret);
		gpio_free(firm_gpio);
		return -EIO;
		}

		usleep_range(10000, 10100);
		pr_debug("NFC firm gpio %d\n", gpio_get_value(firm_gpio));

		ret = gpio_request(ven_gpio, "nfc_reset_gpio");
		if (ret) {
		pr_err("nfc ven gpio req failed ret %d\n", ret);
		gpio_set_value(firm_gpio, 0);
		gpio_free(firm_gpio);
		return -EIO;
		}

		ret = gpio_direction_output(ven_gpio, 0);
		if (ret) {
		pr_err("ven direction set failed ret %d\n", ret);
		gpio_set_value(firm_gpio, 0);
		gpio_free(firm_gpio);
		gpio_free(ven_gpio);
		return -EIO;
		}

		pr_debug("VEN GPIO level %d\n", gpio_get_value(ven_gpio));
		usleep_range(10000, 10100);
		gpio_set_value(ven_gpio, 1);
		pr_debug("VEN GPIO level %d\n", gpio_get_value(ven_gpio));

		gpio_free(ven_gpio);
		gpio_free(firm_gpio);
		return ret;
		}

		module_init(nfc_i3c_gpio_cfg_init);

		static void __exit nfc_i3c_gpio_cfg_exit(void)
		{
		pr_debug("Unloading I3C NFC GPIO Config driver\n");
		}

		module_exit(nfc_i3c_gpio_cfg_exit);

		MODULE_DESCRIPTION("QTI NFC I3C GPIO Config driver");
		MODULE_LICENSE("GPL v2");