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| 1 | +/* |
| 2 | + * Raspberry Pi Sense HAT joystick driver |
| 3 | + * http://raspberrypi.org |
| 4 | + * |
| 5 | + * Copyright (C) 2015 Raspberry Pi |
| 6 | + * |
| 7 | + * Author: Serge Schneider |
| 8 | + * |
| 9 | + * This program is free software; you can redistribute it and/or modify it |
| 10 | + * under the terms of the GNU General Public License as published by the |
| 11 | + * Free Software Foundation; either version 2 of the License, or (at your |
| 12 | + * option) any later version. |
| 13 | + * |
| 14 | + */ |
| 15 | + |
| 16 | +#include <linux/module.h> |
| 17 | + |
| 18 | +#include <linux/mfd/rpisense/joystick.h> |
| 19 | +#include <linux/mfd/rpisense/core.h> |
| 20 | + |
| 21 | +struct rpisense *rpisense; |
| 22 | +unsigned char keymap[5] = {KEY_DOWN, KEY_RIGHT, KEY_UP, KEY_ENTER, KEY_LEFT,}; |
| 23 | + |
| 24 | +static void keys_work_fn(struct work_struct *work) |
| 25 | +{ |
| 26 | + int i; |
| 27 | + static s32 prev_keys; |
| 28 | + struct rpisense_js *rpisense_js = &rpisense->joystick; |
| 29 | + s32 keys = rpisense_reg_read(rpisense, RPISENSE_KEYS); |
| 30 | + s32 changes = keys ^ prev_keys; |
| 31 | + |
| 32 | + prev_keys = keys; |
| 33 | + for (i = 0; i < 5; i++) { |
| 34 | + if (changes & 1) { |
| 35 | + input_report_key(rpisense_js->keys_dev, |
| 36 | + keymap[i], keys & 1); |
| 37 | + } |
| 38 | + changes >>= 1; |
| 39 | + keys >>= 1; |
| 40 | + } |
| 41 | + input_sync(rpisense_js->keys_dev); |
| 42 | +} |
| 43 | + |
| 44 | +static irqreturn_t keys_irq_handler(int irq, void *pdev) |
| 45 | +{ |
| 46 | + struct rpisense_js *rpisense_js = &rpisense->joystick; |
| 47 | + |
| 48 | + schedule_work(&rpisense_js->keys_work_s); |
| 49 | + return IRQ_HANDLED; |
| 50 | +} |
| 51 | + |
| 52 | +static int rpisense_js_probe(struct platform_device *pdev) |
| 53 | +{ |
| 54 | + int ret; |
| 55 | + int i; |
| 56 | + struct rpisense_js *rpisense_js; |
| 57 | + |
| 58 | + rpisense = rpisense_get_dev(); |
| 59 | + rpisense_js = &rpisense->joystick; |
| 60 | + |
| 61 | + INIT_WORK(&rpisense_js->keys_work_s, keys_work_fn); |
| 62 | + |
| 63 | + rpisense_js->keys_dev = input_allocate_device(); |
| 64 | + if (!rpisense_js->keys_dev) { |
| 65 | + dev_err(&pdev->dev, "Could not allocate input device.\n"); |
| 66 | + return -ENOMEM; |
| 67 | + } |
| 68 | + |
| 69 | + rpisense_js->keys_dev->evbit[0] = BIT_MASK(EV_KEY); |
| 70 | + for (i = 0; i < ARRAY_SIZE(keymap); i++) { |
| 71 | + set_bit(keymap[i], |
| 72 | + rpisense_js->keys_dev->keybit); |
| 73 | + } |
| 74 | + |
| 75 | + rpisense_js->keys_dev->name = "Raspberry Pi Sense HAT Joystick"; |
| 76 | + rpisense_js->keys_dev->phys = "rpi-sense-joy/input0"; |
| 77 | + rpisense_js->keys_dev->id.bustype = BUS_I2C; |
| 78 | + rpisense_js->keys_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); |
| 79 | + rpisense_js->keys_dev->keycode = keymap; |
| 80 | + rpisense_js->keys_dev->keycodesize = sizeof(unsigned char); |
| 81 | + rpisense_js->keys_dev->keycodemax = ARRAY_SIZE(keymap); |
| 82 | + |
| 83 | + ret = input_register_device(rpisense_js->keys_dev); |
| 84 | + if (ret) { |
| 85 | + dev_err(&pdev->dev, "Could not register input device.\n"); |
| 86 | + goto err_keys_alloc; |
| 87 | + } |
| 88 | + |
| 89 | + ret = gpiod_direction_input(rpisense_js->keys_desc); |
| 90 | + if (ret) { |
| 91 | + dev_err(&pdev->dev, "Could not set keys-int direction.\n"); |
| 92 | + goto err_keys_reg; |
| 93 | + } |
| 94 | + |
| 95 | + rpisense_js->keys_irq = gpiod_to_irq(rpisense_js->keys_desc); |
| 96 | + if (rpisense_js->keys_irq < 0) { |
| 97 | + dev_err(&pdev->dev, "Could not determine keys-int IRQ.\n"); |
| 98 | + ret = rpisense_js->keys_irq; |
| 99 | + goto err_keys_reg; |
| 100 | + } |
| 101 | + |
| 102 | + ret = devm_request_irq(&pdev->dev, rpisense_js->keys_irq, |
| 103 | + keys_irq_handler, IRQF_TRIGGER_RISING, |
| 104 | + "keys", &pdev->dev); |
| 105 | + if (ret) { |
| 106 | + dev_err(&pdev->dev, "IRQ request failed.\n"); |
| 107 | + goto err_keys_reg; |
| 108 | + } |
| 109 | + return 0; |
| 110 | +err_keys_reg: |
| 111 | + input_unregister_device(rpisense_js->keys_dev); |
| 112 | +err_keys_alloc: |
| 113 | + input_free_device(rpisense_js->keys_dev); |
| 114 | + return ret; |
| 115 | +} |
| 116 | + |
| 117 | +static int rpisense_js_remove(struct platform_device *pdev) |
| 118 | +{ |
| 119 | + struct rpisense_js *rpisense_js = &rpisense->joystick; |
| 120 | + |
| 121 | + input_unregister_device(rpisense_js->keys_dev); |
| 122 | + input_free_device(rpisense_js->keys_dev); |
| 123 | + return 0; |
| 124 | +} |
| 125 | + |
| 126 | +#ifdef CONFIG_OF |
| 127 | +static const struct of_device_id rpisense_js_id[] = { |
| 128 | + { .compatible = "rpi,rpi-sense-js" }, |
| 129 | + { }, |
| 130 | +}; |
| 131 | +MODULE_DEVICE_TABLE(of, rpisense_js_id); |
| 132 | +#endif |
| 133 | + |
| 134 | +static struct platform_device_id rpisense_js_device_id[] = { |
| 135 | + { .name = "rpi-sense-js" }, |
| 136 | + { }, |
| 137 | +}; |
| 138 | +MODULE_DEVICE_TABLE(platform, rpisense_js_device_id); |
| 139 | + |
| 140 | +static struct platform_driver rpisense_js_driver = { |
| 141 | + .probe = rpisense_js_probe, |
| 142 | + .remove = rpisense_js_remove, |
| 143 | + .driver = { |
| 144 | + .name = "rpi-sense-js", |
| 145 | + .owner = THIS_MODULE, |
| 146 | + }, |
| 147 | +}; |
| 148 | + |
| 149 | +module_platform_driver(rpisense_js_driver); |
| 150 | + |
| 151 | +MODULE_DESCRIPTION("Raspberry Pi Sense HAT joystick driver"); |
| 152 | +MODULE_AUTHOR( "Serge Schneider <[email protected]>"); |
| 153 | +MODULE_LICENSE("GPL"); |
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