From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- drivers/extcon/extcon-gpio.c | 165 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 165 insertions(+) create mode 100644 drivers/extcon/extcon-gpio.c (limited to 'drivers/extcon/extcon-gpio.c') diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c new file mode 100644 index 000000000..4105df74f --- /dev/null +++ b/drivers/extcon/extcon-gpio.c @@ -0,0 +1,165 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * extcon_gpio.c - Single-state GPIO extcon driver based on extcon class + * + * Copyright (C) 2008 Google, Inc. + * Author: Mike Lockwood + * + * Modified by MyungJoo Ham to support extcon + * (originally switch class is supported) + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/** + * struct gpio_extcon_data - A simple GPIO-controlled extcon device state container. + * @edev: Extcon device. + * @work: Work fired by the interrupt. + * @debounce_jiffies: Number of jiffies to wait for the GPIO to stabilize, from the debounce + * value. + * @gpiod: GPIO descriptor for this external connector. + * @extcon_id: The unique id of specific external connector. + * @debounce: Debounce time for GPIO IRQ in ms. + * @check_on_resume: Boolean describing whether to check the state of gpio + * while resuming from sleep. + */ +struct gpio_extcon_data { + struct extcon_dev *edev; + struct delayed_work work; + unsigned long debounce_jiffies; + struct gpio_desc *gpiod; + unsigned int extcon_id; + unsigned long debounce; + bool check_on_resume; +}; + +static void gpio_extcon_work(struct work_struct *work) +{ + int state; + struct gpio_extcon_data *data = + container_of(to_delayed_work(work), struct gpio_extcon_data, + work); + + state = gpiod_get_value_cansleep(data->gpiod); + extcon_set_state_sync(data->edev, data->extcon_id, state); +} + +static irqreturn_t gpio_irq_handler(int irq, void *dev_id) +{ + struct gpio_extcon_data *data = dev_id; + + queue_delayed_work(system_power_efficient_wq, &data->work, + data->debounce_jiffies); + return IRQ_HANDLED; +} + +static int gpio_extcon_probe(struct platform_device *pdev) +{ + struct gpio_extcon_data *data; + struct device *dev = &pdev->dev; + unsigned long irq_flags; + int irq; + int ret; + + data = devm_kzalloc(dev, sizeof(struct gpio_extcon_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + /* + * FIXME: extcon_id represents the unique identifier of external + * connectors such as EXTCON_USB, EXTCON_DISP_HDMI and so on. extcon_id + * is necessary to register the extcon device. But, it's not yet + * developed to get the extcon id from device-tree or others. + * On later, it have to be solved. + */ + if (data->extcon_id > EXTCON_NONE) + return -EINVAL; + + data->gpiod = devm_gpiod_get(dev, "extcon", GPIOD_IN); + if (IS_ERR(data->gpiod)) + return PTR_ERR(data->gpiod); + irq = gpiod_to_irq(data->gpiod); + if (irq <= 0) + return irq; + + /* + * It is unlikely that this is an acknowledged interrupt that goes + * away after handling, what we are looking for are falling edges + * if the signal is active low, and rising edges if the signal is + * active high. + */ + if (gpiod_is_active_low(data->gpiod)) + irq_flags = IRQF_TRIGGER_FALLING; + else + irq_flags = IRQF_TRIGGER_RISING; + + /* Allocate the memory of extcon devie and register extcon device */ + data->edev = devm_extcon_dev_allocate(dev, &data->extcon_id); + if (IS_ERR(data->edev)) { + dev_err(dev, "failed to allocate extcon device\n"); + return -ENOMEM; + } + + ret = devm_extcon_dev_register(dev, data->edev); + if (ret < 0) + return ret; + + ret = devm_delayed_work_autocancel(dev, &data->work, gpio_extcon_work); + if (ret) + return ret; + + /* + * Request the interrupt of gpio to detect whether external connector + * is attached or detached. + */ + ret = devm_request_any_context_irq(dev, irq, + gpio_irq_handler, irq_flags, + pdev->name, data); + if (ret < 0) + return ret; + + platform_set_drvdata(pdev, data); + /* Perform initial detection */ + gpio_extcon_work(&data->work.work); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int gpio_extcon_resume(struct device *dev) +{ + struct gpio_extcon_data *data; + + data = dev_get_drvdata(dev); + if (data->check_on_resume) + queue_delayed_work(system_power_efficient_wq, + &data->work, data->debounce_jiffies); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(gpio_extcon_pm_ops, NULL, gpio_extcon_resume); + +static struct platform_driver gpio_extcon_driver = { + .probe = gpio_extcon_probe, + .driver = { + .name = "extcon-gpio", + .pm = &gpio_extcon_pm_ops, + }, +}; + +module_platform_driver(gpio_extcon_driver); + +MODULE_AUTHOR("Mike Lockwood "); +MODULE_DESCRIPTION("GPIO extcon driver"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1