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 #include <linux/regulator/consumer.h> 21 22 #define INT3496_GPIO_USB_ID 0 23 #define INT3496_GPIO_VBUS_EN 1 24 #define INT3496_GPIO_USB_MUX 2 25 #define DEBOUNCE_TIME msecs_to_jiffies(50) 26 27 struct 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 39 static const unsigned int int3496_cable[] = { 40 EXTCON_USB_HOST, 41 EXTCON_NONE, 42 }; 43 44 static const struct acpi_gpio_params id_gpios = { INT3496_GPIO_USB_ID, 0, false }; 45 static const struct acpi_gpio_params vbus_gpios = { INT3496_GPIO_VBUS_EN, 0, false }; 46 static const struct acpi_gpio_params mux_gpios = { INT3496_GPIO_USB_MUX, 0, false }; 47 48 static const struct acpi_gpio_mapping acpi_int3496_default_gpios[] = { 49 /* 50 * Some platforms have a bug in ACPI GPIO description making IRQ 51 * 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 59 static 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 else 72 ret = regulator_disable(data->vbus_boost); 73 74 if (ret == 0) 75 data->vbus_boost_enabled = enable; 76 else 77 dev_err(data->dev, "Error updating Vbus boost regulator: %d\n", ret); 78 } 79 80 static 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 VBUS 91 * Host: set USB mux to host and enable VBUS 92 */ 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 else 99 int3496_set_vbus_boost(data, !id); 100 101 extcon_set_state_sync(data->edev, EXTCON_USB_HOST, !id); 102 } 103 104 static 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 } 113 114 static 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 } 191 192 static const struct acpi_device_id int3496_acpi_match[] = { 193 { "INT3496" }, 194 { } 195 }; 196 MODULE_DEVICE_TABLE(acpi, int3496_acpi_match); 197 198 static const struct platform_device_id int3496_ids[] = { 199 { .name = "intel-int3496" }, 200 {}, 201 }; 202 MODULE_DEVICE_TABLE(platform, int3496_ids); 203 204 static 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 }; 212 213 module_platform_driver(int3496_driver); 214 215 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); 216 MODULE_DESCRIPTION("Intel INT3496 ACPI device extcon driver"); 217 MODULE_LICENSE("GPL v2"); 218