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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 | // SPDX-License-Identifier: GPL-2.0-only /* * CPCAP Power Button Input Driver * * Copyright (C) 2017 Sebastian Reichel <sre@kernel.org> */ #include <linux/module.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/input.h> #include <linux/interrupt.h> #include <linux/regmap.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/mfd/motorola-cpcap.h> #define CPCAP_IRQ_ON 23 #define CPCAP_IRQ_ON_BITMASK (1 << (CPCAP_IRQ_ON % 16)) struct cpcap_power_button { struct regmap *regmap; struct input_dev *idev; struct device *dev; }; static irqreturn_t powerbutton_irq(int irq, void *_button) { struct cpcap_power_button *button = _button; int val; val = cpcap_sense_virq(button->regmap, irq); if (val < 0) { dev_err(button->dev, "irq read failed: %d", val); return IRQ_HANDLED; } pm_wakeup_event(button->dev, 0); input_report_key(button->idev, KEY_POWER, val); input_sync(button->idev); return IRQ_HANDLED; } static int cpcap_power_button_probe(struct platform_device *pdev) { struct cpcap_power_button *button; int irq; int err; irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL); if (!button) return -ENOMEM; button->idev = devm_input_allocate_device(&pdev->dev); if (!button->idev) return -ENOMEM; button->regmap = dev_get_regmap(pdev->dev.parent, NULL); if (!button->regmap) return -ENODEV; button->dev = &pdev->dev; button->idev->name = "cpcap-pwrbutton"; button->idev->phys = "cpcap-pwrbutton/input0"; input_set_capability(button->idev, EV_KEY, KEY_POWER); err = devm_request_threaded_irq(&pdev->dev, irq, NULL, powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", button); if (err < 0) { dev_err(&pdev->dev, "IRQ request failed: %d\n", err); return err; } err = input_register_device(button->idev); if (err) { dev_err(&pdev->dev, "Input register failed: %d\n", err); return err; } device_init_wakeup(&pdev->dev, true); return 0; } #ifdef CONFIG_OF static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = { { .compatible = "motorola,cpcap-pwrbutton" }, {}, }; MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table); #endif static struct platform_driver cpcap_power_button_driver = { .probe = cpcap_power_button_probe, .driver = { .name = "cpcap-pwrbutton", .of_match_table = of_match_ptr(cpcap_pwrbutton_dt_match_table), }, }; module_platform_driver(cpcap_power_button_driver); MODULE_ALIAS("platform:cpcap-pwrbutton"); MODULE_DESCRIPTION("CPCAP Power Button"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); |