1/*
2 * Intel MIC Platform Software Stack (MPSS)
3 *
4 * Copyright(c) 2015 Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2, as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * The full GNU General Public License is included in this distribution in
16 * the file called "COPYING".
17 *
18 * Intel MIC COSM Bus Driver
19 */
20#include <linux/slab.h>
21#include <linux/module.h>
22#include <linux/idr.h>
23#include "cosm_bus.h"
24
25/* Unique numbering for cosm devices. */
26static DEFINE_IDA(cosm_index_ida);
27
28static int cosm_dev_probe(struct device *d)
29{
30 struct cosm_device *dev = dev_to_cosm(d);
31 struct cosm_driver *drv = drv_to_cosm(dev->dev.driver);
32
33 return drv->probe(dev);
34}
35
36static int cosm_dev_remove(struct device *d)
37{
38 struct cosm_device *dev = dev_to_cosm(d);
39 struct cosm_driver *drv = drv_to_cosm(dev->dev.driver);
40
41 drv->remove(dev);
42 return 0;
43}
44
45static struct bus_type cosm_bus = {
46 .name = "cosm_bus",
47 .probe = cosm_dev_probe,
48 .remove = cosm_dev_remove,
49};
50
51int cosm_register_driver(struct cosm_driver *driver)
52{
53 driver->driver.bus = &cosm_bus;
54 return driver_register(&driver->driver);
55}
56EXPORT_SYMBOL_GPL(cosm_register_driver);
57
58void cosm_unregister_driver(struct cosm_driver *driver)
59{
60 driver_unregister(&driver->driver);
61}
62EXPORT_SYMBOL_GPL(cosm_unregister_driver);
63
64static inline void cosm_release_dev(struct device *d)
65{
66 struct cosm_device *cdev = dev_to_cosm(d);
67
68 kfree(cdev);
69}
70
71struct cosm_device *
72cosm_register_device(struct device *pdev, struct cosm_hw_ops *hw_ops)
73{
74 struct cosm_device *cdev;
75 int ret;
76
77 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
78 if (!cdev)
79 return ERR_PTR(-ENOMEM);
80
81 cdev->dev.parent = pdev;
82 cdev->dev.release = cosm_release_dev;
83 cdev->hw_ops = hw_ops;
84 dev_set_drvdata(&cdev->dev, cdev);
85 cdev->dev.bus = &cosm_bus;
86
87 /* Assign a unique device index and hence name */
88 ret = ida_simple_get(&cosm_index_ida, 0, 0, GFP_KERNEL);
89 if (ret < 0)
90 goto free_cdev;
91
92 cdev->index = ret;
93 cdev->dev.id = ret;
94 dev_set_name(&cdev->dev, "cosm-dev%u", cdev->index);
95
96 ret = device_register(&cdev->dev);
97 if (ret)
98 goto ida_remove;
99 return cdev;
100ida_remove:
101 ida_simple_remove(&cosm_index_ida, cdev->index);
102free_cdev:
103 put_device(&cdev->dev);
104 return ERR_PTR(ret);
105}
106EXPORT_SYMBOL_GPL(cosm_register_device);
107
108void cosm_unregister_device(struct cosm_device *dev)
109{
110 int index = dev->index; /* save for after device release */
111
112 device_unregister(&dev->dev);
113 ida_simple_remove(&cosm_index_ida, index);
114}
115EXPORT_SYMBOL_GPL(cosm_unregister_device);
116
117struct cosm_device *cosm_find_cdev_by_id(int id)
118{
119 struct device *dev = subsys_find_device_by_id(&cosm_bus, id, NULL);
120
121 return dev ? container_of(dev, struct cosm_device, dev) : NULL;
122}
123EXPORT_SYMBOL_GPL(cosm_find_cdev_by_id);
124
125static int __init cosm_init(void)
126{
127 return bus_register(&cosm_bus);
128}
129
130static void __exit cosm_exit(void)
131{
132 bus_unregister(&cosm_bus);
133 ida_destroy(&cosm_index_ida);
134}
135
136core_initcall(cosm_init);
137module_exit(cosm_exit);
138
139MODULE_AUTHOR("Intel Corporation");
140MODULE_DESCRIPTION("Intel(R) MIC card OS state management bus driver");
141MODULE_LICENSE("GPL v2");
142