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![Charles Mirabile](/assets/img/avatar_default.png)
This patch adds the driver for the Sense HAT joystick. It outputs BTN_DPAD key events when moved in any of the four directions and the BTN_SELECT event when depressed. Co-developed-by: Daniel Bauman <dbauman@redhat.com> Signed-off-by: Daniel Bauman <dbauman@redhat.com> Co-developed-by: Mwesigwa Guma <mguma@redhat.com> Signed-off-by: Mwesigwa Guma <mguma@redhat.com> Co-developed-by: Joel Savitz <jsavitz@redhat.com> Signed-off-by: Joel Savitz <jsavitz@redhat.com> Signed-off-by: Charles Mirabile <cmirabil@redhat.com> Link: https://lore.kernel.org/r/20220419205158.28088-3-cmirabil@redhat.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
137 lines
3.7 KiB
C
137 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Raspberry Pi Sense HAT joystick driver
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* http://raspberrypi.org
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*
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* Copyright (C) 2015 Raspberry Pi
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* Copyright (C) 2021 Charles Mirabile, Mwesigwa Guma, Joel Savitz
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*
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* Original Author: Serge Schneider
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* Revised for upstream Linux by: Charles Mirabile, Mwesigwa Guma, Joel Savitz
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*/
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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/property.h>
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#define JOYSTICK_SMB_REG 0xf2
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struct sensehat_joystick {
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struct platform_device *pdev;
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struct input_dev *keys_dev;
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unsigned long prev_states;
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struct regmap *regmap;
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};
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static const unsigned int keymap[] = {
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BTN_DPAD_DOWN, BTN_DPAD_RIGHT, BTN_DPAD_UP, BTN_SELECT, BTN_DPAD_LEFT,
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};
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static irqreturn_t sensehat_joystick_report(int irq, void *cookie)
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{
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struct sensehat_joystick *sensehat_joystick = cookie;
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unsigned long curr_states, changes;
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unsigned int keys;
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int error;
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int i;
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error = regmap_read(sensehat_joystick->regmap, JOYSTICK_SMB_REG, &keys);
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if (error < 0) {
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dev_err(&sensehat_joystick->pdev->dev,
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"Failed to read joystick state: %d", error);
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return IRQ_NONE;
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}
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curr_states = keys;
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bitmap_xor(&changes, &curr_states, &sensehat_joystick->prev_states,
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ARRAY_SIZE(keymap));
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for_each_set_bit(i, &changes, ARRAY_SIZE(keymap))
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input_report_key(sensehat_joystick->keys_dev, keymap[i],
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curr_states & BIT(i));
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input_sync(sensehat_joystick->keys_dev);
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sensehat_joystick->prev_states = keys;
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return IRQ_HANDLED;
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}
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static int sensehat_joystick_probe(struct platform_device *pdev)
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{
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struct sensehat_joystick *sensehat_joystick;
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int error, i, irq;
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sensehat_joystick = devm_kzalloc(&pdev->dev, sizeof(*sensehat_joystick),
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GFP_KERNEL);
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if (!sensehat_joystick)
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return -ENOMEM;
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sensehat_joystick->pdev = pdev;
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sensehat_joystick->regmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!sensehat_joystick->regmap) {
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dev_err(&pdev->dev, "unable to get sensehat regmap");
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return -ENODEV;
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}
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sensehat_joystick->keys_dev = devm_input_allocate_device(&pdev->dev);
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if (!sensehat_joystick->keys_dev) {
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dev_err(&pdev->dev, "Could not allocate input device");
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return -ENOMEM;
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}
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sensehat_joystick->keys_dev->name = "Raspberry Pi Sense HAT Joystick";
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sensehat_joystick->keys_dev->phys = "sensehat-joystick/input0";
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sensehat_joystick->keys_dev->id.bustype = BUS_I2C;
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__set_bit(EV_KEY, sensehat_joystick->keys_dev->evbit);
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__set_bit(EV_REP, sensehat_joystick->keys_dev->evbit);
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for (i = 0; i < ARRAY_SIZE(keymap); i++)
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__set_bit(keymap[i], sensehat_joystick->keys_dev->keybit);
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error = input_register_device(sensehat_joystick->keys_dev);
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if (error) {
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dev_err(&pdev->dev, "Could not register input device");
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return error;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev, "Could not retrieve interrupt request");
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return irq;
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}
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error = devm_request_threaded_irq(&pdev->dev, irq,
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NULL, sensehat_joystick_report,
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IRQF_ONESHOT, "keys",
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sensehat_joystick);
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if (error) {
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dev_err(&pdev->dev, "IRQ request failed");
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return error;
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}
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return 0;
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}
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static const struct of_device_id sensehat_joystick_device_id[] = {
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{ .compatible = "raspberrypi,sensehat-joystick" },
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{},
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};
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MODULE_DEVICE_TABLE(of, sensehat_joystick_device_id);
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static struct platform_driver sensehat_joystick_driver = {
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.probe = sensehat_joystick_probe,
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.driver = {
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.name = "sensehat-joystick",
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.of_match_table = sensehat_joystick_device_id,
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},
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};
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module_platform_driver(sensehat_joystick_driver);
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MODULE_DESCRIPTION("Raspberry Pi Sense HAT joystick driver");
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MODULE_AUTHOR("Charles Mirabile <cmirabil@redhat.com>");
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MODULE_AUTHOR("Serge Schneider <serge@raspberrypi.org>");
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MODULE_LICENSE("GPL");
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