1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Intel INT3496 ACPI device extcon driver 4 * 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 21 #define INT3496_GPIO_USB_ID 0 22 #define INT3496_GPIO_VBUS_EN 1 23 #define INT3496_GPIO_USB_MUX 2 24 #define DEBOUNCE_TIME msecs_to_jiffies(50) 25 26 struct int3496_data { 27 struct device *dev; 28 struct extcon_dev *edev; 29 struct delayed_work work; 30 struct gpio_desc *gpio_usb_id; 31 struct gpio_desc *gpio_vbus_en; 32 struct gpio_desc *gpio_usb_mux; 33 int usb_id_irq; 34 }; 35 36 static const unsigned int int3496_cable[] = { 37 EXTCON_USB_HOST, 38 EXTCON_NONE, 39 }; 40 41 static const struct acpi_gpio_params id_gpios = { INT3496_GPIO_USB_ID, 0, false }; 42 static const struct acpi_gpio_params vbus_gpios = { INT3496_GPIO_VBUS_EN, 0, false }; 43 static const struct acpi_gpio_params mux_gpios = { INT3496_GPIO_USB_MUX, 0, false }; 44 45 static const struct acpi_gpio_mapping acpi_int3496_default_gpios[] = { 46 /* 47 * Some platforms have a bug in ACPI GPIO description making IRQ 48 * GPIO to be output only. Ask the GPIO core to ignore this limit. 49 */ 50 { "id-gpios", &id_gpios, 1, ACPI_GPIO_QUIRK_NO_IO_RESTRICTION }, 51 { "vbus-gpios", &vbus_gpios, 1 }, 52 { "mux-gpios", &mux_gpios, 1 }, 53 { }, 54 }; 55 56 static void int3496_do_usb_id(struct work_struct *work) 57 { 58 struct int3496_data *data = 59 container_of(work, struct int3496_data, work.work); 60 int id = gpiod_get_value_cansleep(data->gpio_usb_id); 61 62 /* id == 1: PERIPHERAL, id == 0: HOST */ 63 dev_dbg(data->dev, "Connected %s cable\n", id ? "PERIPHERAL" : "HOST"); 64 65 /* 66 * Peripheral: set USB mux to peripheral and disable VBUS 67 * Host: set USB mux to host and enable VBUS 68 */ 69 if (!IS_ERR(data->gpio_usb_mux)) 70 gpiod_direction_output(data->gpio_usb_mux, id); 71 72 if (!IS_ERR(data->gpio_vbus_en)) 73 gpiod_direction_output(data->gpio_vbus_en, !id); 74 75 extcon_set_state_sync(data->edev, EXTCON_USB_HOST, !id); 76 } 77 78 static irqreturn_t int3496_thread_isr(int irq, void *priv) 79 { 80 struct int3496_data *data = priv; 81 82 /* Let the pin settle before processing it */ 83 mod_delayed_work(system_wq, &data->work, DEBOUNCE_TIME); 84 85 return IRQ_HANDLED; 86 } 87 88 static int int3496_probe(struct platform_device *pdev) 89 { 90 struct device *dev = &pdev->dev; 91 struct int3496_data *data; 92 int ret; 93 94 ret = devm_acpi_dev_add_driver_gpios(dev, acpi_int3496_default_gpios); 95 if (ret) { 96 dev_err(dev, "can't add GPIO ACPI mapping\n"); 97 return ret; 98 } 99 100 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 101 if (!data) 102 return -ENOMEM; 103 104 data->dev = dev; 105 ret = devm_delayed_work_autocancel(dev, &data->work, int3496_do_usb_id); 106 if (ret) 107 return ret; 108 109 data->gpio_usb_id = devm_gpiod_get(dev, "id", GPIOD_IN); 110 if (IS_ERR(data->gpio_usb_id)) { 111 ret = PTR_ERR(data->gpio_usb_id); 112 dev_err(dev, "can't request USB ID GPIO: %d\n", ret); 113 return ret; 114 } 115 116 data->usb_id_irq = gpiod_to_irq(data->gpio_usb_id); 117 if (data->usb_id_irq < 0) { 118 dev_err(dev, "can't get USB ID IRQ: %d\n", data->usb_id_irq); 119 return data->usb_id_irq; 120 } 121 122 data->gpio_vbus_en = devm_gpiod_get(dev, "vbus", GPIOD_ASIS); 123 if (IS_ERR(data->gpio_vbus_en)) 124 dev_info(dev, "can't request VBUS EN GPIO\n"); 125 126 data->gpio_usb_mux = devm_gpiod_get(dev, "mux", GPIOD_ASIS); 127 if (IS_ERR(data->gpio_usb_mux)) 128 dev_info(dev, "can't request USB MUX GPIO\n"); 129 130 /* register extcon device */ 131 data->edev = devm_extcon_dev_allocate(dev, int3496_cable); 132 if (IS_ERR(data->edev)) 133 return -ENOMEM; 134 135 ret = devm_extcon_dev_register(dev, data->edev); 136 if (ret < 0) { 137 dev_err(dev, "can't register extcon device: %d\n", ret); 138 return ret; 139 } 140 141 ret = devm_request_threaded_irq(dev, data->usb_id_irq, 142 NULL, int3496_thread_isr, 143 IRQF_SHARED | IRQF_ONESHOT | 144 IRQF_TRIGGER_RISING | 145 IRQF_TRIGGER_FALLING, 146 dev_name(dev), data); 147 if (ret < 0) { 148 dev_err(dev, "can't request IRQ for USB ID GPIO: %d\n", ret); 149 return ret; 150 } 151 152 /* process id-pin so that we start with the right status */ 153 queue_delayed_work(system_wq, &data->work, 0); 154 flush_delayed_work(&data->work); 155 156 platform_set_drvdata(pdev, data); 157 158 return 0; 159 } 160 161 static const struct acpi_device_id int3496_acpi_match[] = { 162 { "INT3496" }, 163 { } 164 }; 165 MODULE_DEVICE_TABLE(acpi, int3496_acpi_match); 166 167 static struct platform_driver int3496_driver = { 168 .driver = { 169 .name = "intel-int3496", 170 .acpi_match_table = int3496_acpi_match, 171 }, 172 .probe = int3496_probe, 173 }; 174 175 module_platform_driver(int3496_driver); 176 177 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); 178 MODULE_DESCRIPTION("Intel INT3496 ACPI device extcon driver"); 179 MODULE_LICENSE("GPL v2"); 180