1 // SPDX-License-Identifier: GPL-2.0-only
11 #include <linux/input.h>
19  * @up: GPIO line for up value.
20  * @down: GPIO line for down value.
21  * @left: GPIO line for left value.
22  * @right: GPIO line for right value.
44  * The dev input variable is set to the input_dev pointer.
46 static void gpio_mouse_scan(struct input_dev *input)  in gpio_mouse_scan()  argument
48 	struct gpio_mouse *gpio = input_get_drvdata(input);  in gpio_mouse_scan()
51 	if (gpio->bleft)  in gpio_mouse_scan()
52 		input_report_key(input, BTN_LEFT,  in gpio_mouse_scan()
53 				 gpiod_get_value(gpio->bleft));  in gpio_mouse_scan()
54 	if (gpio->bmiddle)  in gpio_mouse_scan()
55 		input_report_key(input, BTN_MIDDLE,  in gpio_mouse_scan()
56 				 gpiod_get_value(gpio->bmiddle));  in gpio_mouse_scan()
57 	if (gpio->bright)  in gpio_mouse_scan()
58 		input_report_key(input, BTN_RIGHT,  in gpio_mouse_scan()
59 				 gpiod_get_value(gpio->bright));  in gpio_mouse_scan()
61 	x = gpiod_get_value(gpio->right) - gpiod_get_value(gpio->left);  in gpio_mouse_scan()
62 	y = gpiod_get_value(gpio->down) - gpiod_get_value(gpio->up);  in gpio_mouse_scan()
64 	input_report_rel(input, REL_X, x);  in gpio_mouse_scan()
65 	input_report_rel(input, REL_Y, y);  in gpio_mouse_scan()
66 	input_sync(input);  in gpio_mouse_scan()
71 	struct device *dev = &pdev->dev;  in gpio_mouse_probe()
73 	struct input_dev *input;  in gpio_mouse_probe()  local
78 		return -ENOMEM;  in gpio_mouse_probe()
81 	error = device_property_read_u32(dev, "scan-interval-ms",  in gpio_mouse_probe()
82 					 &gmouse->scan_ms);  in gpio_mouse_probe()
83 	if (error || gmouse->scan_ms == 0) {  in gpio_mouse_probe()
85 		gmouse->scan_ms = 50;  in gpio_mouse_probe()
88 	gmouse->up = devm_gpiod_get(dev, "up", GPIOD_IN);  in gpio_mouse_probe()
89 	if (IS_ERR(gmouse->up))  in gpio_mouse_probe()
90 		return PTR_ERR(gmouse->up);  in gpio_mouse_probe()
91 	gmouse->down = devm_gpiod_get(dev, "down", GPIOD_IN);  in gpio_mouse_probe()
92 	if (IS_ERR(gmouse->down))  in gpio_mouse_probe()
93 		return PTR_ERR(gmouse->down);  in gpio_mouse_probe()
94 	gmouse->left = devm_gpiod_get(dev, "left", GPIOD_IN);  in gpio_mouse_probe()
95 	if (IS_ERR(gmouse->left))  in gpio_mouse_probe()
96 		return PTR_ERR(gmouse->left);  in gpio_mouse_probe()
97 	gmouse->right = devm_gpiod_get(dev, "right", GPIOD_IN);  in gpio_mouse_probe()
98 	if (IS_ERR(gmouse->right))  in gpio_mouse_probe()
99 		return PTR_ERR(gmouse->right);  in gpio_mouse_probe()
101 	gmouse->bleft = devm_gpiod_get_optional(dev, "button-left", GPIOD_IN);  in gpio_mouse_probe()
102 	if (IS_ERR(gmouse->bleft))  in gpio_mouse_probe()
103 		return PTR_ERR(gmouse->bleft);  in gpio_mouse_probe()
104 	gmouse->bmiddle = devm_gpiod_get_optional(dev, "button-middle",  in gpio_mouse_probe()
106 	if (IS_ERR(gmouse->bmiddle))  in gpio_mouse_probe()
107 		return PTR_ERR(gmouse->bmiddle);  in gpio_mouse_probe()
108 	gmouse->bright = devm_gpiod_get_optional(dev, "button-right",  in gpio_mouse_probe()
110 	if (IS_ERR(gmouse->bright))  in gpio_mouse_probe()
111 		return PTR_ERR(gmouse->bright);  in gpio_mouse_probe()
113 	input = devm_input_allocate_device(dev);  in gpio_mouse_probe()
114 	if (!input)  in gpio_mouse_probe()
115 		return -ENOMEM;  in gpio_mouse_probe()
117 	input->name = pdev->name;  in gpio_mouse_probe()
118 	input->id.bustype = BUS_HOST;  in gpio_mouse_probe()
120 	input_set_drvdata(input, gmouse);  in gpio_mouse_probe()
122 	input_set_capability(input, EV_REL, REL_X);  in gpio_mouse_probe()
123 	input_set_capability(input, EV_REL, REL_Y);  in gpio_mouse_probe()
124 	if (gmouse->bleft)  in gpio_mouse_probe()
125 		input_set_capability(input, EV_KEY, BTN_LEFT);  in gpio_mouse_probe()
126 	if (gmouse->bmiddle)  in gpio_mouse_probe()
127 		input_set_capability(input, EV_KEY, BTN_MIDDLE);  in gpio_mouse_probe()
128 	if (gmouse->bright)  in gpio_mouse_probe()
129 		input_set_capability(input, EV_KEY, BTN_RIGHT);  in gpio_mouse_probe()
131 	error = input_setup_polling(input, gpio_mouse_scan);  in gpio_mouse_probe()
135 	input_set_poll_interval(input, gmouse->scan_ms);  in gpio_mouse_probe()
137 	error = input_register_device(input);  in gpio_mouse_probe()
139 		dev_err(dev, "could not register input device\n");  in gpio_mouse_probe()
144 		gmouse->scan_ms,  in gpio_mouse_probe()
145 		gmouse->bleft ? "" : "left ",  in gpio_mouse_probe()
146 		gmouse->bmiddle ? "" : "middle ",  in gpio_mouse_probe()
147 		gmouse->bright ? "" : "right");  in gpio_mouse_probe()
153 	{ .compatible = "gpio-mouse", },
167 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");