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@xxxxxxxxxx> Signed-off-by: Daniel Bauman <dbauman@xxxxxxxxxx> Co-developed-by: Mwesigwa Guma <mguma@xxxxxxxxxx> Signed-off-by: Mwesigwa Guma <mguma@xxxxxxxxxx> Co-developed-by: Joel Savitz <jsavitz@xxxxxxxxxx> Signed-off-by: Joel Savitz <jsavitz@xxxxxxxxxx> Signed-off-by: Charles Mirabile <cmirabil@xxxxxxxxxx> --- drivers/input/joystick/Kconfig | 11 ++ drivers/input/joystick/Makefile | 1 + drivers/input/joystick/sensehat-joystick.c | 128 +++++++++++++++++++++ 3 files changed, 140 insertions(+) create mode 100644 drivers/input/joystick/sensehat-joystick.c diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig index 3b23078bc7b5..505a032e2786 100644 --- a/drivers/input/joystick/Kconfig +++ b/drivers/input/joystick/Kconfig @@ -399,4 +399,15 @@ config JOYSTICK_N64 Say Y here if you want enable support for the four built-in controller ports on the Nintendo 64 console. +config JOYSTICK_SENSEHAT + tristate "Raspberry Pi Sense HAT joystick" + depends on INPUT && I2C + select MFD_SIMPLE_MFD_I2C + help + Say Y here if you want to enable the driver for the + the Raspberry Pi Sense HAT. + + To compile this driver as a module, choose M here: the + module will be called sensehat_joystick. + endif diff --git a/drivers/input/joystick/Makefile b/drivers/input/joystick/Makefile index 5174b8aba2dd..39c8b5c6e5ae 100644 --- a/drivers/input/joystick/Makefile +++ b/drivers/input/joystick/Makefile @@ -28,6 +28,7 @@ obj-$(CONFIG_JOYSTICK_N64) += n64joy.o obj-$(CONFIG_JOYSTICK_PSXPAD_SPI) += psxpad-spi.o obj-$(CONFIG_JOYSTICK_PXRC) += pxrc.o obj-$(CONFIG_JOYSTICK_QWIIC) += qwiic-joystick.o +obj-$(CONFIG_JOYSTICK_SENSEHAT) += sensehat-joystick.o obj-$(CONFIG_JOYSTICK_SIDEWINDER) += sidewinder.o obj-$(CONFIG_JOYSTICK_SPACEBALL) += spaceball.o obj-$(CONFIG_JOYSTICK_SPACEORB) += spaceorb.o diff --git a/drivers/input/joystick/sensehat-joystick.c b/drivers/input/joystick/sensehat-joystick.c new file mode 100644 index 000000000000..0a99cf0f3ba0 --- /dev/null +++ b/drivers/input/joystick/sensehat-joystick.c @@ -0,0 +1,128 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Raspberry Pi Sense HAT joystick driver + * http://raspberrypi.org + * + * Copyright (C) 2015 Raspberry Pi + * Copyright (C) 2021 Charles Mirabile, Mwesigwa Guma, Joel Savitz + * + * Original Author: Serge Schneider + * Revised for upstream Linux by: Charles Mirabile, Mwesigwa Guma, Joel Savitz + */ + +#include <linux/module.h> +#include <linux/input.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/property.h> + +#define JOYSTICK_SMB_REG 0xf2 + +struct sensehat_joystick { + struct platform_device *pdev; + struct input_dev *keys_dev; + unsigned long prev_states; + struct regmap *regmap; +}; + +static const unsigned int keymap[] = { + BTN_DPAD_DOWN, BTN_DPAD_RIGHT, BTN_DPAD_UP, BTN_SELECT, BTN_DPAD_LEFT, +}; + +static irqreturn_t sensehat_joystick_report(int n, void *cookie) +{ + int i, error, keys; + struct sensehat_joystick *sensehat_joystick = cookie; + unsigned long curr_states, changes; + + error = regmap_read(sensehat_joystick->regmap, JOYSTICK_SMB_REG, &keys); + if (error < 0) { + dev_err(&sensehat_joystick->pdev->dev, + "Failed to read joystick state: %d", error); + return IRQ_NONE; + } + curr_states = keys; + bitmap_xor(&changes, &curr_states, &sensehat_joystick->prev_states, + ARRAY_SIZE(keymap)); + + for_each_set_bit(i, &changes, ARRAY_SIZE(keymap)) { + input_report_key(sensehat_joystick->keys_dev, keymap[i], + curr_states & BIT(i)); + } + + input_sync(sensehat_joystick->keys_dev); + sensehat_joystick->prev_states = keys; + return IRQ_HANDLED; +} + +static int sensehat_joystick_probe(struct platform_device *pdev) +{ + int error, i, irq; + struct sensehat_joystick *sensehat_joystick = devm_kzalloc( + &pdev->dev, sizeof(*sensehat_joystick), GFP_KERNEL); + + sensehat_joystick->pdev = pdev; + + sensehat_joystick->regmap = dev_get_regmap(sensehat_joystick->pdev->dev.parent, NULL); + + sensehat_joystick->keys_dev = devm_input_allocate_device(&pdev->dev); + if (!sensehat_joystick->keys_dev) { + dev_err(&pdev->dev, "Could not allocate input device.\n"); + return -ENOMEM; + } + + for (i = 0; i < ARRAY_SIZE(keymap); i++) + set_bit(keymap[i], sensehat_joystick->keys_dev->keybit); + + sensehat_joystick->keys_dev->name = "Raspberry Pi Sense HAT Joystick"; + sensehat_joystick->keys_dev->phys = "sensehat-joystick/input0"; + sensehat_joystick->keys_dev->id.bustype = BUS_I2C; + sensehat_joystick->keys_dev->evbit[0] = + BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); + + error = input_register_device(sensehat_joystick->keys_dev); + if (error) { + dev_err(&pdev->dev, "Could not register input device.\n"); + return error; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "Could not retrieve interrupt request.\n"); + return irq; + } + + error = devm_request_threaded_irq(&pdev->dev, irq, NULL, + sensehat_joystick_report, + IRQF_ONESHOT, "keys", + sensehat_joystick); + + if (error) { + dev_err(&pdev->dev, "IRQ request failed.\n"); + return error; + } + + return 0; +} + +static const struct of_device_id sensehat_joystick_device_id[] = { + { .compatible = "raspberrypi,sensehat-joystick" }, + {}, +}; +MODULE_DEVICE_TABLE(of, sensehat_joystick_device_id); + +static struct platform_driver sensehat_joystick_driver = { + .probe = sensehat_joystick_probe, + .driver = { + .name = "sensehat-joystick", + .of_match_table = sensehat_joystick_device_id, + }, +}; + +module_platform_driver(sensehat_joystick_driver); + +MODULE_DESCRIPTION("Raspberry Pi Sense HAT joystick driver"); +MODULE_AUTHOR("Serge Schneider <serge@xxxxxxxxxxxxxxx>"); +MODULE_LICENSE("GPL"); -- 2.31.1
