1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * CPCAP Power Button Input Driver 4 * 5 * Copyright (C) 2017 Sebastian Reichel <sre@kernel.org> 6 */ 7 8 #include <linux/module.h> 9 #include <linux/init.h> 10 #include <linux/kernel.h> 11 #include <linux/errno.h> 12 #include <linux/input.h> 13 #include <linux/interrupt.h> 14 #include <linux/regmap.h> 15 #include <linux/of.h> 16 #include <linux/platform_device.h> 17 #include <linux/mfd/motorola-cpcap.h> 18 19 #define CPCAP_IRQ_ON 23 20 #define CPCAP_IRQ_ON_BITMASK (1 << (CPCAP_IRQ_ON % 16)) 21 22 struct cpcap_power_button { 23 struct regmap *regmap; 24 struct input_dev *idev; 25 struct device *dev; 26 }; 27 28 static irqreturn_t powerbutton_irq(int irq, void *_button) 29 { 30 struct cpcap_power_button *button = _button; 31 int val; 32 33 val = cpcap_sense_virq(button->regmap, irq); 34 if (val < 0) { 35 dev_err(button->dev, "irq read failed: %d", val); 36 return IRQ_HANDLED; 37 } 38 39 pm_wakeup_event(button->dev, 0); 40 input_report_key(button->idev, KEY_POWER, val); 41 input_sync(button->idev); 42 43 return IRQ_HANDLED; 44 } 45 46 static int cpcap_power_button_probe(struct platform_device *pdev) 47 { 48 struct cpcap_power_button *button; 49 int irq; 50 int err; 51 52 irq = platform_get_irq(pdev, 0); 53 if (irq < 0) 54 return irq; 55 56 button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL); 57 if (!button) 58 return -ENOMEM; 59 60 button->idev = devm_input_allocate_device(&pdev->dev); 61 if (!button->idev) 62 return -ENOMEM; 63 64 button->regmap = dev_get_regmap(pdev->dev.parent, NULL); 65 if (!button->regmap) 66 return -ENODEV; 67 68 button->dev = &pdev->dev; 69 70 button->idev->name = "cpcap-pwrbutton"; 71 button->idev->phys = "cpcap-pwrbutton/input0"; 72 input_set_capability(button->idev, EV_KEY, KEY_POWER); 73 74 err = devm_request_threaded_irq(&pdev->dev, irq, NULL, 75 powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", button); 76 if (err < 0) { 77 dev_err(&pdev->dev, "IRQ request failed: %d\n", err); 78 return err; 79 } 80 81 err = input_register_device(button->idev); 82 if (err) { 83 dev_err(&pdev->dev, "Input register failed: %d\n", err); 84 return err; 85 } 86 87 device_init_wakeup(&pdev->dev, true); 88 89 return 0; 90 } 91 92 #ifdef CONFIG_OF 93 static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = { 94 { .compatible = "motorola,cpcap-pwrbutton" }, 95 {}, 96 }; 97 MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table); 98 #endif 99 100 static struct platform_driver cpcap_power_button_driver = { 101 .probe = cpcap_power_button_probe, 102 .driver = { 103 .name = "cpcap-pwrbutton", 104 .of_match_table = of_match_ptr(cpcap_pwrbutton_dt_match_table), 105 }, 106 }; 107 module_platform_driver(cpcap_power_button_driver); 108 109 MODULE_ALIAS("platform:cpcap-pwrbutton"); 110 MODULE_DESCRIPTION("CPCAP Power Button"); 111 MODULE_LICENSE("GPL"); 112 MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); 113