| Message ID | 20211210221033.912430-3-cmirabil@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | None | expand |
Hi Charles, On Fri, Dec 10, 2021 at 05:10:29PM -0500, Charles Mirabile wrote: > 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. This is not really a joystick, at least not in current incarnation, but rather a set of keys. I'd also question whether the selected set is right for the application, I'd look into BTN_DPAD_* maybe? Or, if you want it to be a joystick, map ABS_X/ABS_Y. > > Signed-off-by: Charles Mirabile <cmirabil@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> > --- > drivers/input/joystick/Kconfig | 8 ++ > drivers/input/joystick/Makefile | 1 + > drivers/input/joystick/sensehat-joystick.c | 119 +++++++++++++++++++++ > 3 files changed, 128 insertions(+) > create mode 100644 drivers/input/joystick/sensehat-joystick.c > > diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig > index 3b23078bc7b5..d5c5ffe13903 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 && I2C I do not see I2C accessed directly in this driver, nor GPIO interface. You also do not need to depend on INPUT explicitly here. > + 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..1f6bb09b4d1f > --- /dev/null > +++ b/drivers/input/joystick/sensehat-joystick.c > @@ -0,0 +1,119 @@ > +// 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> Don't think you need this. > +#include <linux/interrupt.h> > +#include <linux/gpio/consumer.h> Not needed. > +#include <linux/platform_device.h> > +#include <linux/regmap.h> > +#include <linux/mfd/sensehat.h> > + > +#define SENSEHAT_KEYS 0xF2 > + > +static int sensehat_get_joystick_state(struct sensehat *sensehat); > + > +static unsigned char keymap[] = { > + KEY_DOWN, KEY_RIGHT, KEY_UP, KEY_ENTER, KEY_LEFT, > +}; Because you allowing manipulating keymap from userspace you need to make a copy of it when setting up input device so that changes do would not persist across bind/unbind. This array needs to be marked const. > + > +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)); > + } > + } If you go with keys/buttons approach, then use bitmap_xor()/for_each_set_bit() - see drivers/input/keyboard/cypress-sf.c::cypress_sf_irq_handler() for example of use. > + input_sync(sensehat_joystick->keys_dev); > + return IRQ_HANDLED; > +} > + > +static int sensehat_joystick_probe(struct platform_device *pdev) > +{ > + int ret; Please call it "error"; > + int i; > + struct sensehat *sensehat = dev_get_drvdata(&pdev->dev); > + struct sensehat_joystick *sensehat_joystick = &sensehat->joystick; This structure (struct sensehat_joystick) should probably be private to this driver. > + > + 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 = devm_request_threaded_irq(&pdev->dev, sensehat->i2c_client->irq, > + NULL, sensehat_joystick_report, > + IRQF_TRIGGER_RISING | IRQF_ONESHOT, Do not specify trigger type, whoever set up client's interrupt should have set up appropriate trigger. > + "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; I do not see the point in having this wrapper. > +} > + > +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@raspberrypi.org>"); > +MODULE_LICENSE("GPL"); > -- > 2.31.1 > Thanks.
diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig index 3b23078bc7b5..d5c5ffe13903 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 && I2C + 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..1f6bb09b4d1f --- /dev/null +++ b/drivers/input/joystick/sensehat-joystick.c @@ -0,0 +1,119 @@ +// 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 <linux/mfd/sensehat.h> + +#define SENSEHAT_KEYS 0xF2 + +static 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_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 = devm_request_threaded_irq(&pdev->dev, sensehat->i2c_client->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@raspberrypi.org>"); +MODULE_LICENSE("GPL");