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NFC: Add driver to configure NFC-I3C controller GPIOs

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

Change-Id: I3eef5b8a327c2c70355c03574b06bf67e26b4419
Signed-off-by: Karthik Poosa <kpoosa2@codeaurora.org>
This commit is contained in:
Karthik Poosa 2020-02-25 18:47:03 +05:30 committed by Gerrit - the friendly Code Review server
parent 535241a5fb
commit 92d40d99da
3 changed files with 114 additions and 1 deletions
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11
drivers/nfc/Kconfig
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@ -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

2
drivers/nfc/qti/Makefile
View File

@ -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

102
drivers/nfc/qti/nfc_i3c_gpio_cfg.c Normal file
View File

@ -0,0 +1,102 @@
// 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");