This patch implements support for the joystick. It supports left/right/up/down/enter and is attached via i2c and a gpio pin for irq. Signed-off-by: Charles Mirabile <cmirabil@xxxxxxxxxx> Signed-off-by: Mwesigwa Guma <mguma@xxxxxxxxxx> Signed-off-by: Joel Savitz <jsavitz@xxxxxxxxxx> --- drivers/input/joystick/Kconfig | 8 ++ drivers/input/joystick/Makefile | 1 + drivers/input/joystick/sensehat-joystick.c | 135 +++++++++++++++++++++ 3 files changed, 144 insertions(+) create mode 100644 drivers/input/joystick/sensehat-joystick.c diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig index 3b23078bc7b5..d2f78353b74c 100644 --- a/drivers/input/joystick/Kconfig +++ b/drivers/input/joystick/Kconfig @@ -399,4 +399,12 @@ 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 GPIOLIB && INPUT + select MFD_SENSEHAT_CORE + + help + This is the joystick driver for the Raspberry Pi Sense HAT + 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..2a25287b5863 --- /dev/null +++ b/drivers/input/joystick/sensehat-joystick.c @@ -0,0 +1,135 @@ +// 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/gpio/consumer.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +#include "sensehat.h" + +int sensehat_get_joystick_state(struct sensehat *sensehat); + +static unsigned char keymap[] = {KEY_DOWN, KEY_RIGHT, KEY_UP, KEY_ENTER, KEY_LEFT,}; + +static irqreturn_t sensehat_joystick_report(int n, void *cookie) +{ + int i; + static s32 prev_keys; + struct sensehat *sensehat = cookie; + struct sensehat_joystick *sensehat_joystick = &sensehat->joystick; + s32 keys = sensehat_get_joystick_state(sensehat); + s32 changes = keys ^ prev_keys; + + prev_keys = keys; + for (i = 0; i < ARRAY_SIZE(keymap); ++i) { + if (changes & (1<<i)) { + input_report_key(sensehat_joystick->keys_dev, + keymap[i], keys & (1<<i)); + } + } + input_sync(sensehat_joystick->keys_dev); + return IRQ_HANDLED; +} + +static int sensehat_joystick_probe(struct platform_device *pdev) +{ + int ret; + int i; + struct sensehat *sensehat = dev_get_drvdata(&pdev->dev); + struct sensehat_joystick *sensehat_joystick = &sensehat->joystick; + + sensehat_joystick->keys_desc = devm_gpiod_get(&sensehat->i2c_client->dev, + "keys-int", GPIOD_IN); + if (IS_ERR(sensehat_joystick->keys_desc)) { + dev_warn(&pdev->dev, "Failed to get keys-int descriptor.\n"); + return PTR_ERR(sensehat_joystick->keys_desc); + } + + + 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 = "rpi-sense-joy/input0"; + sensehat_joystick->keys_dev->id.bustype = BUS_I2C; + sensehat_joystick->keys_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); + sensehat_joystick->keys_dev->keycode = keymap; + sensehat_joystick->keys_dev->keycodesize = sizeof(unsigned char); + sensehat_joystick->keys_dev->keycodemax = ARRAY_SIZE(keymap); + + ret = input_register_device(sensehat_joystick->keys_dev); + if (ret) { + dev_err(&pdev->dev, "Could not register input device.\n"); + return ret; + } + + ret = gpiod_direction_input(sensehat_joystick->keys_desc); + if (ret) { + dev_err(&pdev->dev, "Could not set keys-int direction.\n"); + return ret; + } + + sensehat_joystick->keys_irq = gpiod_to_irq(sensehat_joystick->keys_desc); + if (sensehat_joystick->keys_irq < 0) { + dev_err(&pdev->dev, "Could not determine keys-int IRQ.\n"); + return sensehat_joystick->keys_irq; + } + + ret = devm_request_threaded_irq(&pdev->dev, sensehat_joystick->keys_irq, + NULL, sensehat_joystick_report, IRQF_TRIGGER_RISING | IRQF_ONESHOT, + "keys", sensehat); + + if (ret) { + dev_err(&pdev->dev, "IRQ request failed.\n"); + return ret; + } + return 0; +} + +int sensehat_get_joystick_state(struct sensehat *sensehat) +{ + unsigned int reg; + int ret = regmap_read(sensehat->regmap, SENSEHAT_KEYS, ®); + + return ret < 0 ? ret : reg; +} + +static struct platform_device_id sensehat_joystick_device_id[] = { + { .name = "sensehat-joystick" }, + { }, +}; +MODULE_DEVICE_TABLE(platform, sensehat_joystick_device_id); + +static struct platform_driver sensehat_joystick_driver = { + .probe = sensehat_joystick_probe, + .driver = { + .name = "sensehat-joystick", + }, +}; + +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
