Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/idr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/kdev_t.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/dca.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) static struct class *dca_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static struct idr dca_idr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static spinlock_t dca_idr_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	struct device *cd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	static int req_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	cd = device_create(dca_class, dca->cd, MKDEV(0, slot + 1), NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 			   "requester%d", req_count++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	return PTR_ERR_OR_ZERO(cd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) void dca_sysfs_remove_req(struct dca_provider *dca, int slot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	device_destroy(dca_class, MKDEV(0, slot + 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	struct device *cd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	idr_preload(GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	spin_lock(&dca_idr_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	ret = idr_alloc(&dca_idr, dca, 0, 0, GFP_NOWAIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	if (ret >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		dca->id = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	spin_unlock(&dca_idr_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	idr_preload_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	cd = device_create(dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	if (IS_ERR(cd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		spin_lock(&dca_idr_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		idr_remove(&dca_idr, dca->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 		spin_unlock(&dca_idr_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		return PTR_ERR(cd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	dca->cd = cd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) void dca_sysfs_remove_provider(struct dca_provider *dca)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	device_unregister(dca->cd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	dca->cd = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	spin_lock(&dca_idr_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	idr_remove(&dca_idr, dca->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	spin_unlock(&dca_idr_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) int __init dca_sysfs_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	idr_init(&dca_idr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	spin_lock_init(&dca_idr_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 	dca_class = class_create(THIS_MODULE, "dca");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	if (IS_ERR(dca_class)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 		idr_destroy(&dca_idr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 		return PTR_ERR(dca_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) void __exit dca_sysfs_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) 	class_destroy(dca_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) 	idr_destroy(&dca_idr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)