extcon: int3496: Add Intel INT3496 ACPI device extcon driver
Add an extcon driver for USB OTG ports controlled by an Intel INT3496 ACPI device (e.g. Baytrail, Cherrytrail devices). Signed-off-by: David Cohen <david.a.cohen@intel.com> [hdgoede@redhat.com: Port to current kernel, cleanup, submit upstream] [hdgoede@redhat.com: Add Documentation/extcon/intel-int3496.txt] Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
David Cohen
Chanwoo Choi
parent
5298b83658
commit
2f556bdb9f
22
Documentation/extcon/intel-int3496.txt
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22
Documentation/extcon/intel-int3496.txt
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@ -0,0 +1,22 @@
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Intel INT3496 ACPI device extcon driver documentation
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-----------------------------------------------------
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The Intel INT3496 ACPI device extcon driver is a driver for ACPI
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devices with an acpi-id of INT3496, such as found for example on
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Intel Baytrail and Cherrytrail tablets.
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This ACPI device describes how the OS can read the id-pin of the devices'
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USB-otg port, as well as how it optionally can enable Vbus output on the
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otg port and how it can optionally control the muxing of the data pins
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between an USB host and an USB peripheral controller.
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The ACPI devices exposes this functionality by returning an array with up
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to 3 gpio descriptors from its ACPI _CRS (Current Resource Settings) call:
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Index 0: The input gpio for the id-pin, this is always present and valid
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Index 1: The output gpio for enabling Vbus output from the device to the otg
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port, write 1 to enable the Vbus output (this gpio descriptor may
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be absent or invalid)
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Index 2: The output gpio for muxing of the data pins between the USB host and
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the USB peripheral controller, write 1 to mux to the peripheral
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controller
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@ -42,6 +42,16 @@ config EXTCON_GPIO
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Say Y here to enable GPIO based extcon support. Note that GPIO
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extcon supports single state per extcon instance.
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config EXTCON_INTEL_INT3496
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tristate "Intel INT3496 ACPI device extcon driver"
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depends on GPIOLIB && ACPI
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help
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Say Y here to enable extcon support for USB OTG ports controlled by
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an Intel INT3496 ACPI device.
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This ACPI device is typically found on Intel Baytrail or Cherrytrail
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based tablets, or other Baytrail / Cherrytrail devices.
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config EXTCON_MAX14577
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tristate "Maxim MAX14577/77836 EXTCON Support"
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depends on MFD_MAX14577
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@ -8,6 +8,7 @@ obj-$(CONFIG_EXTCON_ADC_JACK) += extcon-adc-jack.o
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obj-$(CONFIG_EXTCON_ARIZONA) += extcon-arizona.o
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obj-$(CONFIG_EXTCON_AXP288) += extcon-axp288.o
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obj-$(CONFIG_EXTCON_GPIO) += extcon-gpio.o
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obj-$(CONFIG_EXTCON_INTEL_INT3496) += extcon-intel-int3496.o
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obj-$(CONFIG_EXTCON_MAX14577) += extcon-max14577.o
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obj-$(CONFIG_EXTCON_MAX3355) += extcon-max3355.o
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obj-$(CONFIG_EXTCON_MAX77693) += extcon-max77693.o
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179
drivers/extcon/extcon-intel-int3496.c
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179
drivers/extcon/extcon-intel-int3496.c
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/*
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* Intel INT3496 ACPI device extcon driver
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*
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* Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>
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*
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* Based on android x86 kernel code which is:
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*
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* Copyright (c) 2014, Intel Corporation.
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* Author: David Cohen <david.a.cohen@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/acpi.h>
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#include <linux/extcon.h>
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#include <linux/gpio.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#define INT3496_GPIO_USB_ID 0
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#define INT3496_GPIO_VBUS_EN 1
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#define INT3496_GPIO_USB_MUX 2
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#define DEBOUNCE_TIME msecs_to_jiffies(50)
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struct int3496_data {
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struct device *dev;
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struct extcon_dev *edev;
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struct delayed_work work;
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struct gpio_desc *gpio_usb_id;
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struct gpio_desc *gpio_vbus_en;
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struct gpio_desc *gpio_usb_mux;
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int usb_id_irq;
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};
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static const unsigned int int3496_cable[] = {
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EXTCON_USB_HOST,
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EXTCON_NONE,
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};
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static void int3496_do_usb_id(struct work_struct *work)
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{
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struct int3496_data *data =
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container_of(work, struct int3496_data, work.work);
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int id = gpiod_get_value_cansleep(data->gpio_usb_id);
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/* id == 1: PERIPHERAL, id == 0: HOST */
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dev_dbg(data->dev, "Connected %s cable\n", id ? "PERIPHERAL" : "HOST");
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/*
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* Peripheral: set USB mux to peripheral and disable VBUS
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* Host: set USB mux to host and enable VBUS
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*/
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if (!IS_ERR(data->gpio_usb_mux))
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gpiod_direction_output(data->gpio_usb_mux, id);
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if (!IS_ERR(data->gpio_vbus_en))
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gpiod_direction_output(data->gpio_vbus_en, !id);
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extcon_set_state_sync(data->edev, EXTCON_USB_HOST, !id);
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}
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static irqreturn_t int3496_thread_isr(int irq, void *priv)
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{
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struct int3496_data *data = priv;
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/* Let the pin settle before processing it */
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mod_delayed_work(system_wq, &data->work, DEBOUNCE_TIME);
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return IRQ_HANDLED;
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}
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static int int3496_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct int3496_data *data;
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int ret;
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->dev = dev;
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INIT_DELAYED_WORK(&data->work, int3496_do_usb_id);
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data->gpio_usb_id = devm_gpiod_get_index(dev, "id",
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INT3496_GPIO_USB_ID,
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GPIOD_IN);
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if (IS_ERR(data->gpio_usb_id)) {
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ret = PTR_ERR(data->gpio_usb_id);
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dev_err(dev, "can't request USB ID GPIO: %d\n", ret);
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return ret;
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}
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data->usb_id_irq = gpiod_to_irq(data->gpio_usb_id);
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if (data->usb_id_irq <= 0) {
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dev_err(dev, "can't get USB ID IRQ: %d\n", data->usb_id_irq);
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return -EINVAL;
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}
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data->gpio_vbus_en = devm_gpiod_get_index(dev, "vbus en",
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INT3496_GPIO_VBUS_EN,
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GPIOD_ASIS);
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if (IS_ERR(data->gpio_vbus_en))
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dev_info(dev, "can't request VBUS EN GPIO\n");
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data->gpio_usb_mux = devm_gpiod_get_index(dev, "usb mux",
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INT3496_GPIO_USB_MUX,
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GPIOD_ASIS);
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if (IS_ERR(data->gpio_usb_mux))
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dev_info(dev, "can't request USB MUX GPIO\n");
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/* register extcon device */
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data->edev = devm_extcon_dev_allocate(dev, int3496_cable);
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if (IS_ERR(data->edev))
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return -ENOMEM;
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ret = devm_extcon_dev_register(dev, data->edev);
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if (ret < 0) {
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dev_err(dev, "can't register extcon device: %d\n", ret);
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return ret;
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}
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ret = devm_request_threaded_irq(dev, data->usb_id_irq,
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NULL, int3496_thread_isr,
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IRQF_SHARED | IRQF_ONESHOT |
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IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING,
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dev_name(dev), data);
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if (ret < 0) {
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dev_err(dev, "can't request IRQ for USB ID GPIO: %d\n", ret);
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return ret;
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}
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/* queue initial processing of id-pin */
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queue_delayed_work(system_wq, &data->work, 0);
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platform_set_drvdata(pdev, data);
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return 0;
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}
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static int int3496_remove(struct platform_device *pdev)
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{
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struct int3496_data *data = platform_get_drvdata(pdev);
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devm_free_irq(&pdev->dev, data->usb_id_irq, data);
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cancel_delayed_work_sync(&data->work);
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return 0;
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}
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static struct acpi_device_id int3496_acpi_match[] = {
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{ "INT3496" },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, int3496_acpi_match);
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static struct platform_driver int3496_driver = {
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.driver = {
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.name = "intel-int3496",
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.acpi_match_table = int3496_acpi_match,
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},
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.probe = int3496_probe,
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.remove = int3496_remove,
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};
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module_platform_driver(int3496_driver);
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MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
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MODULE_DESCRIPTION("Intel INT3496 ACPI device extcon driver");
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MODULE_LICENSE("GPL");
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