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1// SPDX-License-Identifier: GPL-2.02/*3 * Intel INT3496 ACPI device extcon driver4 *5 * Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>6 *7 * Based on android x86 kernel code which is:8 *9 * Copyright (c) 2014, Intel Corporation.10 * Author: David Cohen <david.a.cohen@linux.intel.com>11 */12 13#include <linux/acpi.h>14#include <linux/devm-helpers.h>15#include <linux/extcon-provider.h>16#include <linux/gpio/consumer.h>17#include <linux/interrupt.h>18#include <linux/module.h>19#include <linux/platform_device.h>20#include <linux/regulator/consumer.h>21 22#define INT3496_GPIO_USB_ID 023#define INT3496_GPIO_VBUS_EN 124#define INT3496_GPIO_USB_MUX 225#define DEBOUNCE_TIME msecs_to_jiffies(50)26 27struct int3496_data {28 struct device *dev;29 struct extcon_dev *edev;30 struct delayed_work work;31 struct gpio_desc *gpio_usb_id;32 struct gpio_desc *gpio_vbus_en;33 struct gpio_desc *gpio_usb_mux;34 struct regulator *vbus_boost;35 int usb_id_irq;36 bool vbus_boost_enabled;37};38 39static const unsigned int int3496_cable[] = {40 EXTCON_USB_HOST,41 EXTCON_NONE,42};43 44static const struct acpi_gpio_params id_gpios = { INT3496_GPIO_USB_ID, 0, false };45static const struct acpi_gpio_params vbus_gpios = { INT3496_GPIO_VBUS_EN, 0, false };46static const struct acpi_gpio_params mux_gpios = { INT3496_GPIO_USB_MUX, 0, false };47 48static const struct acpi_gpio_mapping acpi_int3496_default_gpios[] = {49 /*50 * Some platforms have a bug in ACPI GPIO description making IRQ51 * GPIO to be output only. Ask the GPIO core to ignore this limit.52 */53 { "id-gpios", &id_gpios, 1, ACPI_GPIO_QUIRK_NO_IO_RESTRICTION },54 { "vbus-gpios", &vbus_gpios, 1 },55 { "mux-gpios", &mux_gpios, 1 },56 { },57};58 59static void int3496_set_vbus_boost(struct int3496_data *data, bool enable)60{61 int ret;62 63 if (IS_ERR_OR_NULL(data->vbus_boost))64 return;65 66 if (data->vbus_boost_enabled == enable)67 return;68 69 if (enable)70 ret = regulator_enable(data->vbus_boost);71 else72 ret = regulator_disable(data->vbus_boost);73 74 if (ret == 0)75 data->vbus_boost_enabled = enable;76 else77 dev_err(data->dev, "Error updating Vbus boost regulator: %d\n", ret);78}79 80static void int3496_do_usb_id(struct work_struct *work)81{82 struct int3496_data *data =83 container_of(work, struct int3496_data, work.work);84 int id = gpiod_get_value_cansleep(data->gpio_usb_id);85 86 /* id == 1: PERIPHERAL, id == 0: HOST */87 dev_dbg(data->dev, "Connected %s cable\n", id ? "PERIPHERAL" : "HOST");88 89 /*90 * Peripheral: set USB mux to peripheral and disable VBUS91 * Host: set USB mux to host and enable VBUS92 */93 if (!IS_ERR(data->gpio_usb_mux))94 gpiod_direction_output(data->gpio_usb_mux, id);95 96 if (!IS_ERR(data->gpio_vbus_en))97 gpiod_direction_output(data->gpio_vbus_en, !id);98 else99 int3496_set_vbus_boost(data, !id);100 101 extcon_set_state_sync(data->edev, EXTCON_USB_HOST, !id);102}103 104static irqreturn_t int3496_thread_isr(int irq, void *priv)105{106 struct int3496_data *data = priv;107 108 /* Let the pin settle before processing it */109 mod_delayed_work(system_wq, &data->work, DEBOUNCE_TIME);110 111 return IRQ_HANDLED;112}113 114static int int3496_probe(struct platform_device *pdev)115{116 struct device *dev = &pdev->dev;117 struct int3496_data *data;118 int ret;119 120 if (has_acpi_companion(dev)) {121 ret = devm_acpi_dev_add_driver_gpios(dev, acpi_int3496_default_gpios);122 if (ret) {123 dev_err(dev, "can't add GPIO ACPI mapping\n");124 return ret;125 }126 }127 128 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);129 if (!data)130 return -ENOMEM;131 132 data->dev = dev;133 ret = devm_delayed_work_autocancel(dev, &data->work, int3496_do_usb_id);134 if (ret)135 return ret;136 137 data->gpio_usb_id =138 devm_gpiod_get(dev, "id", GPIOD_IN | GPIOD_FLAGS_BIT_NONEXCLUSIVE);139 if (IS_ERR(data->gpio_usb_id)) {140 ret = PTR_ERR(data->gpio_usb_id);141 dev_err(dev, "can't request USB ID GPIO: %d\n", ret);142 return ret;143 }144 145 data->usb_id_irq = gpiod_to_irq(data->gpio_usb_id);146 if (data->usb_id_irq < 0) {147 dev_err(dev, "can't get USB ID IRQ: %d\n", data->usb_id_irq);148 return data->usb_id_irq;149 }150 151 data->gpio_vbus_en = devm_gpiod_get(dev, "vbus", GPIOD_ASIS);152 if (IS_ERR(data->gpio_vbus_en)) {153 dev_dbg(dev, "can't request VBUS EN GPIO\n");154 data->vbus_boost = devm_regulator_get_optional(dev, "vbus");155 }156 157 data->gpio_usb_mux = devm_gpiod_get(dev, "mux", GPIOD_ASIS);158 if (IS_ERR(data->gpio_usb_mux))159 dev_dbg(dev, "can't request USB MUX GPIO\n");160 161 /* register extcon device */162 data->edev = devm_extcon_dev_allocate(dev, int3496_cable);163 if (IS_ERR(data->edev))164 return -ENOMEM;165 166 ret = devm_extcon_dev_register(dev, data->edev);167 if (ret < 0) {168 dev_err(dev, "can't register extcon device: %d\n", ret);169 return ret;170 }171 172 ret = devm_request_threaded_irq(dev, data->usb_id_irq,173 NULL, int3496_thread_isr,174 IRQF_SHARED | IRQF_ONESHOT |175 IRQF_TRIGGER_RISING |176 IRQF_TRIGGER_FALLING,177 dev_name(dev), data);178 if (ret < 0) {179 dev_err(dev, "can't request IRQ for USB ID GPIO: %d\n", ret);180 return ret;181 }182 183 /* process id-pin so that we start with the right status */184 queue_delayed_work(system_wq, &data->work, 0);185 flush_delayed_work(&data->work);186 187 platform_set_drvdata(pdev, data);188 189 return 0;190}191 192static const struct acpi_device_id int3496_acpi_match[] = {193 { "INT3496" },194 { }195};196MODULE_DEVICE_TABLE(acpi, int3496_acpi_match);197 198static const struct platform_device_id int3496_ids[] = {199 { .name = "intel-int3496" },200 {},201};202MODULE_DEVICE_TABLE(platform, int3496_ids);203 204static struct platform_driver int3496_driver = {205 .driver = {206 .name = "intel-int3496",207 .acpi_match_table = int3496_acpi_match,208 },209 .probe = int3496_probe,210 .id_table = int3496_ids,211};212 213module_platform_driver(int3496_driver);214 215MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");216MODULE_DESCRIPTION("Intel INT3496 ACPI device extcon driver");217MODULE_LICENSE("GPL v2");218