Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 92d40d99 authored by Karthik Poosa's avatar Karthik Poosa Committed by Gerrit - the friendly Code Review server
Browse files

NFC: Add driver to configure NFC-I3C controller GPIOs 



Add driver to toggle NFC GPIOs for I3C enumeration to
pass for NFC controller.

Change-Id: I3eef5b8a327c2c70355c03574b06bf67e26b4419
Signed-off-by: default avatarKarthik Poosa <kpoosa2@codeaurora.org>
parent 535241a5

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");