^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Generic push-switch framework
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2006 Paul Mundt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <asm/push-switch.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define DRV_NAME "push-switch"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define DRV_VERSION "0.1.1"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static ssize_t switch_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) struct push_switch_platform_info *psw_info = dev->platform_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) return sprintf(buf, "%s\n", psw_info->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static DEVICE_ATTR_RO(switch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static void switch_timer(struct timer_list *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct push_switch *psw = from_timer(psw, t, debounce);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) schedule_work(&psw->work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static void switch_work_handler(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct push_switch *psw = container_of(work, struct push_switch, work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct platform_device *pdev = psw->pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) psw->state = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) kobject_uevent(&pdev->dev.kobj, KOBJ_CHANGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static int switch_drv_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct push_switch_platform_info *psw_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct push_switch *psw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) int ret, irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) psw = kzalloc(sizeof(struct push_switch), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (unlikely(!psw))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) irq = platform_get_irq(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (unlikely(irq < 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) psw_info = pdev->dev.platform_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) BUG_ON(!psw_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) ret = request_irq(irq, psw_info->irq_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) psw_info->irq_flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) psw_info->name ? psw_info->name : DRV_NAME, pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) if (unlikely(ret < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (psw_info->name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) ret = device_create_file(&pdev->dev, &dev_attr_switch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) if (unlikely(ret)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) dev_err(&pdev->dev, "Failed creating device attrs\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) goto err_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) INIT_WORK(&psw->work, switch_work_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) timer_setup(&psw->debounce, switch_timer, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /* Workqueue API brain-damage */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) psw->pdev = pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) platform_set_drvdata(pdev, psw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) err_irq:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) free_irq(irq, pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) kfree(psw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) static int switch_drv_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) struct push_switch *psw = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) struct push_switch_platform_info *psw_info = pdev->dev.platform_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) int irq = platform_get_irq(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (psw_info->name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) device_remove_file(&pdev->dev, &dev_attr_switch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) platform_set_drvdata(pdev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) flush_work(&psw->work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) del_timer_sync(&psw->debounce);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) free_irq(irq, pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) kfree(psw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static struct platform_driver switch_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) .probe = switch_drv_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) .remove = switch_drv_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) .name = DRV_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static int __init switch_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) printk(KERN_NOTICE DRV_NAME ": version %s loaded\n", DRV_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return platform_driver_register(&switch_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) static void __exit switch_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) platform_driver_unregister(&switch_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) module_init(switch_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) module_exit(switch_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) MODULE_VERSION(DRV_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) MODULE_AUTHOR("Paul Mundt");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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