1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // Power Button driver for RAVE SP 4 // 5 // Copyright (C) 2017 Zodiac Inflight Innovations 6 // 7 // 8 9 #include <linux/input.h> 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/mfd/rave-sp.h> 13 #include <linux/platform_device.h> 14 15 #define RAVE_SP_EVNT_BUTTON_PRESS (RAVE_SP_EVNT_BASE + 0x00) 16 17 struct rave_sp_power_button { 18 struct input_dev *idev; 19 struct notifier_block nb; 20 }; 21 22 static int rave_sp_power_button_event(struct notifier_block *nb, 23 unsigned long action, void *data) 24 { 25 struct rave_sp_power_button *pb = 26 container_of(nb, struct rave_sp_power_button, nb); 27 const u8 event = rave_sp_action_unpack_event(action); 28 const u8 value = rave_sp_action_unpack_value(action); 29 struct input_dev *idev = pb->idev; 30 31 if (event == RAVE_SP_EVNT_BUTTON_PRESS) { 32 input_report_key(idev, KEY_POWER, value); 33 input_sync(idev); 34 35 return NOTIFY_STOP; 36 } 37 38 return NOTIFY_DONE; 39 } 40 41 static int rave_sp_pwrbutton_probe(struct platform_device *pdev) 42 { 43 struct device *dev = &pdev->dev; 44 struct rave_sp_power_button *pb; 45 struct input_dev *idev; 46 int error; 47 48 pb = devm_kzalloc(dev, sizeof(*pb), GFP_KERNEL); 49 if (!pb) 50 return -ENOMEM; 51 52 idev = devm_input_allocate_device(dev); 53 if (!idev) 54 return -ENOMEM; 55 56 idev->name = pdev->name; 57 58 input_set_capability(idev, EV_KEY, KEY_POWER); 59 60 error = input_register_device(idev); 61 if (error) 62 return error; 63 64 pb->idev = idev; 65 pb->nb.notifier_call = rave_sp_power_button_event; 66 pb->nb.priority = 128; 67 68 error = devm_rave_sp_register_event_notifier(dev, &pb->nb); 69 if (error) 70 return error; 71 72 return 0; 73 } 74 75 static const struct of_device_id rave_sp_pwrbutton_of_match[] = { 76 { .compatible = "zii,rave-sp-pwrbutton" }, 77 {} 78 }; 79 80 static struct platform_driver rave_sp_pwrbutton_driver = { 81 .probe = rave_sp_pwrbutton_probe, 82 .driver = { 83 .name = KBUILD_MODNAME, 84 .of_match_table = rave_sp_pwrbutton_of_match, 85 }, 86 }; 87 module_platform_driver(rave_sp_pwrbutton_driver); 88 89 MODULE_DEVICE_TABLE(of, rave_sp_pwrbutton_of_match); 90 MODULE_LICENSE("GPL"); 91 MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>"); 92 MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@cogentembedded.com>"); 93 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>"); 94 MODULE_DESCRIPTION("RAVE SP Power Button driver"); 95