diff options
Diffstat (limited to 'drivers/input/joystick/rpisense-js.c')
| -rw-r--r-- | drivers/input/joystick/rpisense-js.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/drivers/input/joystick/rpisense-js.c b/drivers/input/joystick/rpisense-js.c new file mode 100644 index 000000000000..6a416769065d --- /dev/null +++ b/drivers/input/joystick/rpisense-js.c @@ -0,0 +1,153 @@ +/* + * Raspberry Pi Sense HAT joystick driver + * http://raspberrypi.org + * + * Copyright (C) 2015 Raspberry Pi + * + * Author: Serge Schneider + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + */ + +#include <linux/module.h> + +#include <linux/mfd/rpisense/joystick.h> +#include <linux/mfd/rpisense/core.h> + +static struct rpisense *rpisense; +static unsigned char keymap[5] = {KEY_DOWN, KEY_RIGHT, KEY_UP, KEY_ENTER, KEY_LEFT,}; + +static void keys_work_fn(struct work_struct *work) +{ + int i; + static s32 prev_keys; + struct rpisense_js *rpisense_js = &rpisense->joystick; + s32 keys = rpisense_reg_read(rpisense, RPISENSE_KEYS); + s32 changes = keys ^ prev_keys; + + prev_keys = keys; + for (i = 0; i < 5; i++) { + if (changes & 1) { + input_report_key(rpisense_js->keys_dev, + keymap[i], keys & 1); + } + changes >>= 1; + keys >>= 1; + } + input_sync(rpisense_js->keys_dev); +} + +static irqreturn_t keys_irq_handler(int irq, void *pdev) +{ + struct rpisense_js *rpisense_js = &rpisense->joystick; + + schedule_work(&rpisense_js->keys_work_s); + return IRQ_HANDLED; +} + +static int rpisense_js_probe(struct platform_device *pdev) +{ + int ret; + int i; + struct rpisense_js *rpisense_js; + + rpisense = rpisense_get_dev(); + rpisense_js = &rpisense->joystick; + + INIT_WORK(&rpisense_js->keys_work_s, keys_work_fn); + + rpisense_js->keys_dev = input_allocate_device(); + if (!rpisense_js->keys_dev) { + dev_err(&pdev->dev, "Could not allocate input device.\n"); + return -ENOMEM; + } + + rpisense_js->keys_dev->evbit[0] = BIT_MASK(EV_KEY); + for (i = 0; i < ARRAY_SIZE(keymap); i++) { + set_bit(keymap[i], + rpisense_js->keys_dev->keybit); + } + + rpisense_js->keys_dev->name = "Raspberry Pi Sense HAT Joystick"; + rpisense_js->keys_dev->phys = "rpi-sense-joy/input0"; + rpisense_js->keys_dev->id.bustype = BUS_I2C; + rpisense_js->keys_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); + rpisense_js->keys_dev->keycode = keymap; + rpisense_js->keys_dev->keycodesize = sizeof(unsigned char); + rpisense_js->keys_dev->keycodemax = ARRAY_SIZE(keymap); + + ret = input_register_device(rpisense_js->keys_dev); + if (ret) { + dev_err(&pdev->dev, "Could not register input device.\n"); + goto err_keys_alloc; + } + + ret = gpiod_direction_input(rpisense_js->keys_desc); + if (ret) { + dev_err(&pdev->dev, "Could not set keys-int direction.\n"); + goto err_keys_reg; + } + + rpisense_js->keys_irq = gpiod_to_irq(rpisense_js->keys_desc); + if (rpisense_js->keys_irq < 0) { + dev_err(&pdev->dev, "Could not determine keys-int IRQ.\n"); + ret = rpisense_js->keys_irq; + goto err_keys_reg; + } + + ret = devm_request_irq(&pdev->dev, rpisense_js->keys_irq, + keys_irq_handler, IRQF_TRIGGER_RISING, + "keys", &pdev->dev); + if (ret) { + dev_err(&pdev->dev, "IRQ request failed.\n"); + goto err_keys_reg; + } + return 0; +err_keys_reg: + input_unregister_device(rpisense_js->keys_dev); +err_keys_alloc: + input_free_device(rpisense_js->keys_dev); + return ret; +} + +static int rpisense_js_remove(struct platform_device *pdev) +{ + struct rpisense_js *rpisense_js = &rpisense->joystick; + + input_unregister_device(rpisense_js->keys_dev); + input_free_device(rpisense_js->keys_dev); + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id rpisense_js_id[] = { + { .compatible = "rpi,rpi-sense-js" }, + { }, +}; +MODULE_DEVICE_TABLE(of, rpisense_js_id); +#endif + +static struct platform_device_id rpisense_js_device_id[] = { + { .name = "rpi-sense-js" }, + { }, +}; +MODULE_DEVICE_TABLE(platform, rpisense_js_device_id); + +static struct platform_driver rpisense_js_driver = { + .probe = rpisense_js_probe, + .remove = rpisense_js_remove, + .driver = { + .name = "rpi-sense-js", + .owner = THIS_MODULE, + }, +}; + +module_platform_driver(rpisense_js_driver); + +MODULE_DESCRIPTION("Raspberry Pi Sense HAT joystick driver"); +MODULE_AUTHOR("Serge Schneider <serge@raspberrypi.org>"); +MODULE_LICENSE("GPL"); |