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2e464ff0 | 1 | // SPDX-License-Identifier: GPL-2.0 |
2f556bdb DC |
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> | |
2f556bdb DC |
11 | */ |
12 | ||
13 | #include <linux/acpi.h> | |
176aa360 | 14 | #include <linux/extcon-provider.h> |
c355bb1a | 15 | #include <linux/gpio/consumer.h> |
2f556bdb DC |
16 | #include <linux/interrupt.h> |
17 | #include <linux/module.h> | |
18 | #include <linux/platform_device.h> | |
19 | ||
20 | #define INT3496_GPIO_USB_ID 0 | |
21 | #define INT3496_GPIO_VBUS_EN 1 | |
22 | #define INT3496_GPIO_USB_MUX 2 | |
23 | #define DEBOUNCE_TIME msecs_to_jiffies(50) | |
24 | ||
25 | struct int3496_data { | |
26 | struct device *dev; | |
27 | struct extcon_dev *edev; | |
28 | struct delayed_work work; | |
29 | struct gpio_desc *gpio_usb_id; | |
30 | struct gpio_desc *gpio_vbus_en; | |
31 | struct gpio_desc *gpio_usb_mux; | |
32 | int usb_id_irq; | |
33 | }; | |
34 | ||
35 | static const unsigned int int3496_cable[] = { | |
36 | EXTCON_USB_HOST, | |
37 | EXTCON_NONE, | |
38 | }; | |
39 | ||
8cb2cbae AS |
40 | static const struct acpi_gpio_params id_gpios = { INT3496_GPIO_USB_ID, 0, false }; |
41 | static const struct acpi_gpio_params vbus_gpios = { INT3496_GPIO_VBUS_EN, 0, false }; | |
42 | static const struct acpi_gpio_params mux_gpios = { INT3496_GPIO_USB_MUX, 0, false }; | |
43 | ||
44 | static const struct acpi_gpio_mapping acpi_int3496_default_gpios[] = { | |
eca0f13c AS |
45 | /* |
46 | * Some platforms have a bug in ACPI GPIO description making IRQ | |
47 | * GPIO to be output only. Ask the GPIO core to ignore this limit. | |
48 | */ | |
49 | { "id-gpios", &id_gpios, 1, ACPI_GPIO_QUIRK_NO_IO_RESTRICTION }, | |
8cb2cbae AS |
50 | { "vbus-gpios", &vbus_gpios, 1 }, |
51 | { "mux-gpios", &mux_gpios, 1 }, | |
52 | { }, | |
53 | }; | |
54 | ||
2f556bdb DC |
55 | static void int3496_do_usb_id(struct work_struct *work) |
56 | { | |
57 | struct int3496_data *data = | |
58 | container_of(work, struct int3496_data, work.work); | |
59 | int id = gpiod_get_value_cansleep(data->gpio_usb_id); | |
60 | ||
61 | /* id == 1: PERIPHERAL, id == 0: HOST */ | |
62 | dev_dbg(data->dev, "Connected %s cable\n", id ? "PERIPHERAL" : "HOST"); | |
63 | ||
64 | /* | |
65 | * Peripheral: set USB mux to peripheral and disable VBUS | |
66 | * Host: set USB mux to host and enable VBUS | |
67 | */ | |
68 | if (!IS_ERR(data->gpio_usb_mux)) | |
69 | gpiod_direction_output(data->gpio_usb_mux, id); | |
70 | ||
71 | if (!IS_ERR(data->gpio_vbus_en)) | |
72 | gpiod_direction_output(data->gpio_vbus_en, !id); | |
73 | ||
74 | extcon_set_state_sync(data->edev, EXTCON_USB_HOST, !id); | |
75 | } | |
76 | ||
77 | static irqreturn_t int3496_thread_isr(int irq, void *priv) | |
78 | { | |
79 | struct int3496_data *data = priv; | |
80 | ||
81 | /* Let the pin settle before processing it */ | |
82 | mod_delayed_work(system_wq, &data->work, DEBOUNCE_TIME); | |
83 | ||
84 | return IRQ_HANDLED; | |
85 | } | |
86 | ||
87 | static int int3496_probe(struct platform_device *pdev) | |
88 | { | |
89 | struct device *dev = &pdev->dev; | |
90 | struct int3496_data *data; | |
91 | int ret; | |
92 | ||
1f4be247 | 93 | ret = devm_acpi_dev_add_driver_gpios(dev, acpi_int3496_default_gpios); |
8cb2cbae AS |
94 | if (ret) { |
95 | dev_err(dev, "can't add GPIO ACPI mapping\n"); | |
96 | return ret; | |
97 | } | |
98 | ||
2f556bdb DC |
99 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
100 | if (!data) | |
101 | return -ENOMEM; | |
102 | ||
103 | data->dev = dev; | |
104 | INIT_DELAYED_WORK(&data->work, int3496_do_usb_id); | |
105 | ||
408c5b41 | 106 | data->gpio_usb_id = devm_gpiod_get(dev, "id", GPIOD_IN); |
2f556bdb DC |
107 | if (IS_ERR(data->gpio_usb_id)) { |
108 | ret = PTR_ERR(data->gpio_usb_id); | |
109 | dev_err(dev, "can't request USB ID GPIO: %d\n", ret); | |
110 | return ret; | |
111 | } | |
112 | ||
113 | data->usb_id_irq = gpiod_to_irq(data->gpio_usb_id); | |
bafa687d | 114 | if (data->usb_id_irq < 0) { |
2f556bdb | 115 | dev_err(dev, "can't get USB ID IRQ: %d\n", data->usb_id_irq); |
bafa687d | 116 | return data->usb_id_irq; |
2f556bdb DC |
117 | } |
118 | ||
408c5b41 | 119 | data->gpio_vbus_en = devm_gpiod_get(dev, "vbus", GPIOD_ASIS); |
2f556bdb DC |
120 | if (IS_ERR(data->gpio_vbus_en)) |
121 | dev_info(dev, "can't request VBUS EN GPIO\n"); | |
122 | ||
408c5b41 | 123 | data->gpio_usb_mux = devm_gpiod_get(dev, "mux", GPIOD_ASIS); |
2f556bdb DC |
124 | if (IS_ERR(data->gpio_usb_mux)) |
125 | dev_info(dev, "can't request USB MUX GPIO\n"); | |
126 | ||
127 | /* register extcon device */ | |
128 | data->edev = devm_extcon_dev_allocate(dev, int3496_cable); | |
129 | if (IS_ERR(data->edev)) | |
130 | return -ENOMEM; | |
131 | ||
132 | ret = devm_extcon_dev_register(dev, data->edev); | |
133 | if (ret < 0) { | |
134 | dev_err(dev, "can't register extcon device: %d\n", ret); | |
135 | return ret; | |
136 | } | |
137 | ||
138 | ret = devm_request_threaded_irq(dev, data->usb_id_irq, | |
139 | NULL, int3496_thread_isr, | |
140 | IRQF_SHARED | IRQF_ONESHOT | | |
141 | IRQF_TRIGGER_RISING | | |
142 | IRQF_TRIGGER_FALLING, | |
143 | dev_name(dev), data); | |
144 | if (ret < 0) { | |
145 | dev_err(dev, "can't request IRQ for USB ID GPIO: %d\n", ret); | |
146 | return ret; | |
147 | } | |
148 | ||
0434352d | 149 | /* process id-pin so that we start with the right status */ |
2f556bdb | 150 | queue_delayed_work(system_wq, &data->work, 0); |
0434352d | 151 | flush_delayed_work(&data->work); |
2f556bdb DC |
152 | |
153 | platform_set_drvdata(pdev, data); | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
158 | static int int3496_remove(struct platform_device *pdev) | |
159 | { | |
160 | struct int3496_data *data = platform_get_drvdata(pdev); | |
161 | ||
162 | devm_free_irq(&pdev->dev, data->usb_id_irq, data); | |
163 | cancel_delayed_work_sync(&data->work); | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
ff890bc0 | 168 | static const struct acpi_device_id int3496_acpi_match[] = { |
2f556bdb DC |
169 | { "INT3496" }, |
170 | { } | |
171 | }; | |
172 | MODULE_DEVICE_TABLE(acpi, int3496_acpi_match); | |
173 | ||
174 | static struct platform_driver int3496_driver = { | |
175 | .driver = { | |
176 | .name = "intel-int3496", | |
177 | .acpi_match_table = int3496_acpi_match, | |
178 | }, | |
179 | .probe = int3496_probe, | |
180 | .remove = int3496_remove, | |
181 | }; | |
182 | ||
183 | module_platform_driver(int3496_driver); | |
184 | ||
185 | MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); | |
186 | MODULE_DESCRIPTION("Intel INT3496 ACPI device extcon driver"); | |
2e464ff0 | 187 | MODULE_LICENSE("GPL v2"); |