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1 | /* |
2 | * Intel INT3496 ACPI device extcon driver | |
3 | * | |
4 | * Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com> | |
5 | * | |
6 | * Based on android x86 kernel code which is: | |
7 | * | |
8 | * Copyright (c) 2014, Intel Corporation. | |
9 | * Author: David Cohen <david.a.cohen@linux.intel.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | */ | |
20 | ||
21 | #include <linux/acpi.h> | |
22 | #include <linux/extcon.h> | |
23 | #include <linux/gpio.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/platform_device.h> | |
27 | ||
28 | #define INT3496_GPIO_USB_ID 0 | |
29 | #define INT3496_GPIO_VBUS_EN 1 | |
30 | #define INT3496_GPIO_USB_MUX 2 | |
31 | #define DEBOUNCE_TIME msecs_to_jiffies(50) | |
32 | ||
33 | struct int3496_data { | |
34 | struct device *dev; | |
35 | struct extcon_dev *edev; | |
36 | struct delayed_work work; | |
37 | struct gpio_desc *gpio_usb_id; | |
38 | struct gpio_desc *gpio_vbus_en; | |
39 | struct gpio_desc *gpio_usb_mux; | |
40 | int usb_id_irq; | |
41 | }; | |
42 | ||
43 | static const unsigned int int3496_cable[] = { | |
44 | EXTCON_USB_HOST, | |
45 | EXTCON_NONE, | |
46 | }; | |
47 | ||
8cb2cbae AS |
48 | static const struct acpi_gpio_params id_gpios = { INT3496_GPIO_USB_ID, 0, false }; |
49 | static const struct acpi_gpio_params vbus_gpios = { INT3496_GPIO_VBUS_EN, 0, false }; | |
50 | static const struct acpi_gpio_params mux_gpios = { INT3496_GPIO_USB_MUX, 0, false }; | |
51 | ||
52 | static const struct acpi_gpio_mapping acpi_int3496_default_gpios[] = { | |
53 | { "id-gpios", &id_gpios, 1 }, | |
54 | { "vbus-gpios", &vbus_gpios, 1 }, | |
55 | { "mux-gpios", &mux_gpios, 1 }, | |
56 | { }, | |
57 | }; | |
58 | ||
2f556bdb DC |
59 | static void int3496_do_usb_id(struct work_struct *work) |
60 | { | |
61 | struct int3496_data *data = | |
62 | container_of(work, struct int3496_data, work.work); | |
63 | int id = gpiod_get_value_cansleep(data->gpio_usb_id); | |
64 | ||
65 | /* id == 1: PERIPHERAL, id == 0: HOST */ | |
66 | dev_dbg(data->dev, "Connected %s cable\n", id ? "PERIPHERAL" : "HOST"); | |
67 | ||
68 | /* | |
69 | * Peripheral: set USB mux to peripheral and disable VBUS | |
70 | * Host: set USB mux to host and enable VBUS | |
71 | */ | |
72 | if (!IS_ERR(data->gpio_usb_mux)) | |
73 | gpiod_direction_output(data->gpio_usb_mux, id); | |
74 | ||
75 | if (!IS_ERR(data->gpio_vbus_en)) | |
76 | gpiod_direction_output(data->gpio_vbus_en, !id); | |
77 | ||
78 | extcon_set_state_sync(data->edev, EXTCON_USB_HOST, !id); | |
79 | } | |
80 | ||
81 | static irqreturn_t int3496_thread_isr(int irq, void *priv) | |
82 | { | |
83 | struct int3496_data *data = priv; | |
84 | ||
85 | /* Let the pin settle before processing it */ | |
86 | mod_delayed_work(system_wq, &data->work, DEBOUNCE_TIME); | |
87 | ||
88 | return IRQ_HANDLED; | |
89 | } | |
90 | ||
91 | static int int3496_probe(struct platform_device *pdev) | |
92 | { | |
93 | struct device *dev = &pdev->dev; | |
94 | struct int3496_data *data; | |
95 | int ret; | |
96 | ||
8cb2cbae AS |
97 | ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), |
98 | acpi_int3496_default_gpios); | |
99 | if (ret) { | |
100 | dev_err(dev, "can't add GPIO ACPI mapping\n"); | |
101 | return ret; | |
102 | } | |
103 | ||
2f556bdb DC |
104 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
105 | if (!data) | |
106 | return -ENOMEM; | |
107 | ||
108 | data->dev = dev; | |
109 | INIT_DELAYED_WORK(&data->work, int3496_do_usb_id); | |
110 | ||
408c5b41 | 111 | data->gpio_usb_id = devm_gpiod_get(dev, "id", GPIOD_IN); |
2f556bdb DC |
112 | if (IS_ERR(data->gpio_usb_id)) { |
113 | ret = PTR_ERR(data->gpio_usb_id); | |
114 | dev_err(dev, "can't request USB ID GPIO: %d\n", ret); | |
115 | return ret; | |
70216fd9 HG |
116 | } else if (gpiod_get_direction(data->gpio_usb_id) != GPIOF_DIR_IN) { |
117 | dev_warn(dev, FW_BUG "USB ID GPIO not in input mode, fixing\n"); | |
118 | gpiod_direction_input(data->gpio_usb_id); | |
2f556bdb DC |
119 | } |
120 | ||
121 | data->usb_id_irq = gpiod_to_irq(data->gpio_usb_id); | |
bafa687d | 122 | if (data->usb_id_irq < 0) { |
2f556bdb | 123 | dev_err(dev, "can't get USB ID IRQ: %d\n", data->usb_id_irq); |
bafa687d | 124 | return data->usb_id_irq; |
2f556bdb DC |
125 | } |
126 | ||
408c5b41 | 127 | data->gpio_vbus_en = devm_gpiod_get(dev, "vbus", GPIOD_ASIS); |
2f556bdb DC |
128 | if (IS_ERR(data->gpio_vbus_en)) |
129 | dev_info(dev, "can't request VBUS EN GPIO\n"); | |
130 | ||
408c5b41 | 131 | data->gpio_usb_mux = devm_gpiod_get(dev, "mux", GPIOD_ASIS); |
2f556bdb DC |
132 | if (IS_ERR(data->gpio_usb_mux)) |
133 | dev_info(dev, "can't request USB MUX GPIO\n"); | |
134 | ||
135 | /* register extcon device */ | |
136 | data->edev = devm_extcon_dev_allocate(dev, int3496_cable); | |
137 | if (IS_ERR(data->edev)) | |
138 | return -ENOMEM; | |
139 | ||
140 | ret = devm_extcon_dev_register(dev, data->edev); | |
141 | if (ret < 0) { | |
142 | dev_err(dev, "can't register extcon device: %d\n", ret); | |
143 | return ret; | |
144 | } | |
145 | ||
146 | ret = devm_request_threaded_irq(dev, data->usb_id_irq, | |
147 | NULL, int3496_thread_isr, | |
148 | IRQF_SHARED | IRQF_ONESHOT | | |
149 | IRQF_TRIGGER_RISING | | |
150 | IRQF_TRIGGER_FALLING, | |
151 | dev_name(dev), data); | |
152 | if (ret < 0) { | |
153 | dev_err(dev, "can't request IRQ for USB ID GPIO: %d\n", ret); | |
154 | return ret; | |
155 | } | |
156 | ||
157 | /* queue initial processing of id-pin */ | |
158 | queue_delayed_work(system_wq, &data->work, 0); | |
159 | ||
160 | platform_set_drvdata(pdev, data); | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | static int int3496_remove(struct platform_device *pdev) | |
166 | { | |
167 | struct int3496_data *data = platform_get_drvdata(pdev); | |
168 | ||
169 | devm_free_irq(&pdev->dev, data->usb_id_irq, data); | |
170 | cancel_delayed_work_sync(&data->work); | |
171 | ||
8cb2cbae AS |
172 | acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev)); |
173 | ||
2f556bdb DC |
174 | return 0; |
175 | } | |
176 | ||
177 | static struct acpi_device_id int3496_acpi_match[] = { | |
178 | { "INT3496" }, | |
179 | { } | |
180 | }; | |
181 | MODULE_DEVICE_TABLE(acpi, int3496_acpi_match); | |
182 | ||
183 | static struct platform_driver int3496_driver = { | |
184 | .driver = { | |
185 | .name = "intel-int3496", | |
186 | .acpi_match_table = int3496_acpi_match, | |
187 | }, | |
188 | .probe = int3496_probe, | |
189 | .remove = int3496_remove, | |
190 | }; | |
191 | ||
192 | module_platform_driver(int3496_driver); | |
193 | ||
194 | MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); | |
195 | MODULE_DESCRIPTION("Intel INT3496 ACPI device extcon driver"); | |
196 | MODULE_LICENSE("GPL"); |