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