qcom: genoa_extcon_notifier: Add genoa extcon notifier driver
Add support for genoa extcon notifier driver which helps to provide extcon notification to internal drivers based on vbus detect on genoa msm VBUS_DETECT gpio GPIO19, which is connected to VBUS of USB type C connector. The driver handles interrupt on GPIO 19 and register extcon device for USB and USB_HOST such that dwc3-msm.c can register VBUS/ID notifier callbacks for cable connection status. This driver in addition drives GPIOS based on connect D+/D- lines to Genoa or USB type C connector. Change-Id: I700f7d98916b96e702bff7937b4600da4a55c331 Signed-off-by: AKASH KUMAR <quic_akakum@quicinc.com>
This commit is contained in:
AKASH KUMAR
@@ -137,6 +137,16 @@ config USB_APPLEDISPLAY
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Say Y here if you want to control the backlight of Apple Cinema
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Displays over USB. This driver provides a sysfs interface.
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config USB_VBUS_EXTCON_GENOA
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tristate "USB Vbus detect genoa driver"
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help
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Say Y here if you want to support USB SW switch to device or
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host mode.
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This driver is for genoa USB devices that used to send extcon
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notification to USB glue driver to role switch between host
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and peripheral mode based GPIO state of genoa msm.
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source "drivers/usb/misc/sisusbvga/Kconfig"
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config USB_LD
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@@ -34,3 +34,4 @@ obj-$(CONFIG_USB_REDRIVER_NB7VPQ904M) += ssusb-redriver-nb7vpq904m.o
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obj-$(CONFIG_USB_QTI_KS_BRIDGE) += ks_bridge.o
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obj-$(CONFIG_USB_QCOM_DIAG_BRIDGE) += diag_ipc_bridge.o
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obj-$(CONFIG_USB_VBUS_EXTCON_GENOA) += vbus-extcon-genoa.o
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276
drivers/usb/misc/vbus-extcon-genoa.c
Normal file
276
drivers/usb/misc/vbus-extcon-genoa.c
Normal file
@@ -0,0 +1,276 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_device.h>
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#include <linux/extcon.h>
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#include <linux/extcon-provider.h>
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#include <linux/interrupt.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/gpio.h>
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#include <linux/init.h>
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/**
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* struct genoa_st - platform device data for genoa
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* extcon driver.
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* @dev: pointer to the genoa device.
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* @extcon: pointer to the extcon device.
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* @vbus_det_gpio: variable to monitor VBUS_DET GPIO which is used for
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* vbus notifications. If
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* 0: device mode cable is disconnected so msm can run
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* in host mode to activate Genoa use case.
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* 1: device mode cable to windows host PC is
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* connected as VBUS_DET GPIO is connected to VBUS.
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* @usb_id_gpio: variable to drive USB_ID GPIO which is the id
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* pin for USB port,If
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* 1: device mode cable is disconnected so msm will
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* be in host mode.
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* 0: device mode cable is connected so msm will
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* be in peripheral mode.
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* @vbus_det_gpio_irq: variable used as an irq line to trigger interrupt
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* based on VBUS_DET GPIO rising/falling events.
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* @genoa_usb_oe_n_gpio: variable to drive USB_OE_N GPIO if device mode cable is
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* connected to genoa/Windows Host PC or disconnected.
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* drive it
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* HIGH: switch will be disabled.
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* LOW: switch will be enabled.
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*/
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struct genoa_st {
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struct extcon_dev *extcon;
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unsigned int vbus_det_gpio;
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unsigned int usb_id_gpio;
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unsigned int vbus_det_gpio_irq;
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unsigned int genoa_usb_oe_n_gpio;
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};
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/* USB external connector */
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static const unsigned int genoa_extcon_cable[] = {
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EXTCON_USB,
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EXTCON_USB_HOST,
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};
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static struct genoa_st *gpst;
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static void genoa_peripheral_mode_init(void)
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{
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gpio_set_value_cansleep(gpst->genoa_usb_oe_n_gpio, 0);
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gpio_set_value_cansleep(gpst->usb_id_gpio, 0);
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extcon_set_state_sync(gpst->extcon, EXTCON_USB_HOST, false);
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extcon_set_state_sync(gpst->extcon, EXTCON_USB, true);
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}
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static void genoa_host_mode_init(void)
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{
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gpio_set_value_cansleep(gpst->genoa_usb_oe_n_gpio, 0);
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gpio_set_value_cansleep(gpst->usb_id_gpio, 1);
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extcon_set_state_sync(gpst->extcon, EXTCON_USB, false);
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extcon_set_state_sync(gpst->extcon, EXTCON_USB_HOST, true);
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}
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/*
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* genoa_vbus_det_gpio_isr will be called when user manually
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* connects/disconnects device mode cable and set peripheral
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* or host mode accordingly based on VBUS_DET GPIO.
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*/
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static irqreturn_t genoa_vbus_det_gpio_isr(int irq, void *dev_id)
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{
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if (gpio_get_value(gpst->vbus_det_gpio))
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genoa_peripheral_mode_init();
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else
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genoa_host_mode_init();
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return IRQ_HANDLED;
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}
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static int genoa_populate_dt_info(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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int ret;
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ret = of_get_named_gpio(np, "genoa_vbus_det", 0);
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if (ret < 0) {
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dev_err(&pdev->dev, "couldn't find genoa vbus det gpio %d\n",
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ret);
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return -ENODEV;
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}
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gpst->vbus_det_gpio = ret;
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ret = of_get_named_gpio(np, "genoa_usb_id", 0);
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if (ret < 0) {
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dev_err(&pdev->dev, "couldn't find genoa usb id gpio %d\n",
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ret);
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return -ENODEV;
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}
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gpst->usb_id_gpio = ret;
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ret = of_get_named_gpio(np, "genoa_usb_oe_n", 1);
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if (ret < 0) {
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dev_err(&pdev->dev, "couldn't find genoa usb_oe_n gpio %d\n",
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ret);
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return -ENODEV;
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}
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gpst->genoa_usb_oe_n_gpio = ret;
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dev_info(&pdev->dev, "genoa vbus_det_gpio:%d usb_id_gpio:%d genoa_usb_oe_n_gpio:%d gpio\n",
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gpst->vbus_det_gpio, gpst->usb_id_gpio,
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gpst->genoa_usb_oe_n_gpio);
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return 0;
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}
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static ssize_t mode_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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if (gpio_get_value(gpst->vbus_det_gpio))
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return scnprintf(buf, PAGE_SIZE, "peripheral mode\n");
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return scnprintf(buf, PAGE_SIZE, "host mode\n");
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}
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static ssize_t mode_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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if (sysfs_streq(buf, "peripheral"))
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genoa_peripheral_mode_init();
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else if (sysfs_streq(buf, "host"))
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genoa_host_mode_init();
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else
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return -EINVAL;
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return count;
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}
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static DEVICE_ATTR_RW(mode);
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static int genoa_probe(struct platform_device *pdev)
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{
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int ret;
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if (pdev->dev.of_node) {
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gpst = devm_kzalloc(&pdev->dev, sizeof(*gpst), GFP_KERNEL);
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if (!gpst)
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return -ENOMEM;
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ret = genoa_populate_dt_info(pdev);
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if (ret < 0) {
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dev_err(&pdev->dev,
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"couldn't populate dt info err: %d\n",
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ret);
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goto err;
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}
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} else {
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dev_err(&pdev->dev,
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"couldn't find of node for genoa device\n");
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return -ENODEV;
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}
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platform_set_drvdata(pdev, gpst);
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/* configure vbus det gpio as input*/
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ret = devm_gpio_request_one(&pdev->dev, gpst->vbus_det_gpio, GPIOF_IN,
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"genoa_vbus_det_gpio");
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if (ret < 0) {
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dev_err(&pdev->dev,
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"failed to configure input direction for gpio %d err:%d\n",
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gpst->vbus_det_gpio, ret);
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goto err;
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}
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/* configure usb id gpio as output*/
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ret = devm_gpio_request_one(&pdev->dev, gpst->usb_id_gpio,
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GPIOF_DIR_OUT, "genoa_usb_id_gpio");
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if (ret < 0) {
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dev_err(&pdev->dev,
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"failed to configure input direction for gpio %d err:%d\n",
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gpst->vbus_det_gpio, ret);
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goto err;
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}
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/* configure usb_oe_n gpio as output*/
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ret = devm_gpio_request_one(&pdev->dev, gpst->genoa_usb_oe_n_gpio,
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GPIOF_OUT_INIT_HIGH, "genoa_usb_oe_n_gpio");
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if (ret < 0) {
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dev_err(&pdev->dev,
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"failed to configure input direction for gpio %d err:%d\n",
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gpst->vbus_det_gpio, ret);
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goto err;
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}
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ret = gpio_to_irq(gpst->vbus_det_gpio);
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if (ret < 0) {
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dev_err(&pdev->dev, "couldn't find genoa vbus det irq err:%d\n",
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ret);
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goto err;
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}
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gpst->vbus_det_gpio_irq = ret;
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gpst->extcon = devm_extcon_dev_allocate(&pdev->dev, genoa_extcon_cable);
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if (IS_ERR(gpst->extcon)) {
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dev_err(&pdev->dev, "%s: failed to allocate extcon device\n",
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__func__);
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return PTR_ERR(gpst->extcon);
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}
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ret = devm_extcon_dev_register(&pdev->dev, gpst->extcon);
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if (ret) {
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dev_err(&pdev->dev, "%s: failed to register extcon device %d\n",
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__func__, ret);
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goto err;
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}
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ret = devm_request_irq(&pdev->dev, gpst->vbus_det_gpio_irq,
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genoa_vbus_det_gpio_isr,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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"vbus-det-irq-trigger", NULL);
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if (ret < 0) {
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dev_err(&pdev->dev, "couldn't acquire genoa vbus det irq %d\n",
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ret);
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goto err;
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}
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/*setting the state while bootup*/
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if (gpio_get_value(gpst->vbus_det_gpio))
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genoa_peripheral_mode_init();
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else
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genoa_host_mode_init();
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device_create_file(&pdev->dev, &dev_attr_mode);
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return 0;
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err:
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return ret;
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}
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static int genoa_remove(struct platform_device *pdev)
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{
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device_remove_file(&pdev->dev, &dev_attr_mode);
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return 0;
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}
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static const struct of_device_id genoa_dt_match[] = {
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{.compatible = "qcom,genoa-extcon"},
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{},
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};
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MODULE_DEVICE_TABLE(of, genoa_dt_match);
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static struct platform_driver genoa_driver = {
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.probe = genoa_probe,
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.remove = genoa_remove,
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.driver = {
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.name = "genoa-msm-vbus-det",
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.of_match_table = genoa_dt_match,
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},
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};
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module_platform_driver(genoa_driver);
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MODULE_DESCRIPTION("QTI genoa vbus detect driver");
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MODULE_LICENSE("GPL v2");
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