^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Driver for simulating a mouse on GPIO lines.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2007 Atmel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/input.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/property.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * struct gpio_mouse
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * @scan_ms: the scan interval in milliseconds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * @up: GPIO line for up value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * @down: GPIO line for down value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * @left: GPIO line for left value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * @right: GPIO line for right value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * @bleft: GPIO line for left button.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * @bmiddle: GPIO line for middle button.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * @bright: GPIO line for right button.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * This struct must be added to the platform_device in the board code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * It is used by the gpio_mouse driver to setup GPIO lines and to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * calculate mouse movement.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct gpio_mouse {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) u32 scan_ms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct gpio_desc *up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct gpio_desc *down;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct gpio_desc *left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct gpio_desc *right;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct gpio_desc *bleft;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct gpio_desc *bmiddle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct gpio_desc *bright;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * Timer function which is run every scan_ms ms when the device is opened.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * The dev input variable is set to the the input_dev pointer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static void gpio_mouse_scan(struct input_dev *input)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct gpio_mouse *gpio = input_get_drvdata(input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) int x, y;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (gpio->bleft)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) input_report_key(input, BTN_LEFT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) gpiod_get_value(gpio->bleft));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (gpio->bmiddle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) input_report_key(input, BTN_MIDDLE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) gpiod_get_value(gpio->bmiddle));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) if (gpio->bright)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) input_report_key(input, BTN_RIGHT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) gpiod_get_value(gpio->bright));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) x = gpiod_get_value(gpio->right) - gpiod_get_value(gpio->left);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) y = gpiod_get_value(gpio->down) - gpiod_get_value(gpio->up);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) input_report_rel(input, REL_X, x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) input_report_rel(input, REL_Y, y);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) input_sync(input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) static int gpio_mouse_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct gpio_mouse *gmouse;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct input_dev *input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) gmouse = devm_kzalloc(dev, sizeof(*gmouse), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (!gmouse)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /* Assign some default scanning time */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) error = device_property_read_u32(dev, "scan-interval-ms",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) &gmouse->scan_ms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (error || gmouse->scan_ms == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) dev_warn(dev, "invalid scan time, set to 50 ms\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) gmouse->scan_ms = 50;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) gmouse->up = devm_gpiod_get(dev, "up", GPIOD_IN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (IS_ERR(gmouse->up))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return PTR_ERR(gmouse->up);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) gmouse->down = devm_gpiod_get(dev, "down", GPIOD_IN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (IS_ERR(gmouse->down))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) return PTR_ERR(gmouse->down);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) gmouse->left = devm_gpiod_get(dev, "left", GPIOD_IN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (IS_ERR(gmouse->left))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return PTR_ERR(gmouse->left);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) gmouse->right = devm_gpiod_get(dev, "right", GPIOD_IN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (IS_ERR(gmouse->right))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return PTR_ERR(gmouse->right);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) gmouse->bleft = devm_gpiod_get_optional(dev, "button-left", GPIOD_IN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (IS_ERR(gmouse->bleft))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) return PTR_ERR(gmouse->bleft);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) gmouse->bmiddle = devm_gpiod_get_optional(dev, "button-middle",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) GPIOD_IN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (IS_ERR(gmouse->bmiddle))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return PTR_ERR(gmouse->bmiddle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) gmouse->bright = devm_gpiod_get_optional(dev, "button-right",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) GPIOD_IN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (IS_ERR(gmouse->bright))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return PTR_ERR(gmouse->bright);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) input = devm_input_allocate_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (!input)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) input->name = pdev->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) input->id.bustype = BUS_HOST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) input_set_drvdata(input, gmouse);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) input_set_capability(input, EV_REL, REL_X);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) input_set_capability(input, EV_REL, REL_Y);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (gmouse->bleft)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) input_set_capability(input, EV_KEY, BTN_LEFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (gmouse->bmiddle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) input_set_capability(input, EV_KEY, BTN_MIDDLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (gmouse->bright)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) input_set_capability(input, EV_KEY, BTN_RIGHT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) error = input_setup_polling(input, gpio_mouse_scan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) input_set_poll_interval(input, gmouse->scan_ms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) error = input_register_device(input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) dev_err(dev, "could not register input device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) dev_dbg(dev, "%d ms scan time, buttons: %s%s%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) gmouse->scan_ms,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) gmouse->bleft ? "" : "left ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) gmouse->bmiddle ? "" : "middle ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) gmouse->bright ? "" : "right");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static const struct of_device_id gpio_mouse_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) { .compatible = "gpio-mouse", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) { },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) MODULE_DEVICE_TABLE(of, gpio_mouse_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) static struct platform_driver gpio_mouse_device_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) .probe = gpio_mouse_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) .name = "gpio_mouse",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) .of_match_table = gpio_mouse_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) module_platform_driver(gpio_mouse_device_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) MODULE_DESCRIPTION("GPIO mouse driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) MODULE_ALIAS("platform:gpio_mouse"); /* work with hotplug and coldplug */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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