Christian Gromm | ba3d7dd | 2015-07-24 16:11:53 +0200 | [diff] [blame] | 1 | /* |
| 2 | * dim2_sysfs.c - MediaLB sysfs information |
| 3 | * |
| 4 | * Copyright (C) 2015, Microchip Technology Germany II GmbH & Co. KG |
| 5 | * |
| 6 | * This program is distributed in the hope that it will be useful, |
| 7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 9 | * GNU General Public License for more details. |
| 10 | * |
| 11 | * This file is licensed under GPLv2. |
| 12 | */ |
| 13 | |
| 14 | /* Author: Andrey Shvetsov <andrey.shvetsov@k2l.de> */ |
| 15 | |
| 16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 17 | |
| 18 | #include <linux/kernel.h> |
| 19 | #include "dim2_sysfs.h" |
| 20 | |
| 21 | struct bus_attr { |
| 22 | struct attribute attr; |
| 23 | ssize_t (*show)(struct medialb_bus *bus, char *buf); |
Christian Gromm | 9158d33 | 2015-10-15 13:28:51 +0200 | [diff] [blame] | 24 | ssize_t (*store)(struct medialb_bus *bus, const char *buf, |
| 25 | size_t count); |
Christian Gromm | ba3d7dd | 2015-07-24 16:11:53 +0200 | [diff] [blame] | 26 | }; |
| 27 | |
| 28 | static ssize_t state_show(struct medialb_bus *bus, char *buf) |
| 29 | { |
| 30 | bool state = dim2_sysfs_get_state_cb(); |
| 31 | |
| 32 | return sprintf(buf, "%s\n", state ? "locked" : ""); |
| 33 | } |
| 34 | |
| 35 | static struct bus_attr state_attr = __ATTR_RO(state); |
| 36 | |
| 37 | static struct attribute *bus_default_attrs[] = { |
| 38 | &state_attr.attr, |
| 39 | NULL, |
| 40 | }; |
| 41 | |
| 42 | static struct attribute_group bus_attr_group = { |
| 43 | .attrs = bus_default_attrs, |
| 44 | }; |
| 45 | |
| 46 | static void bus_kobj_release(struct kobject *kobj) |
| 47 | { |
| 48 | } |
| 49 | |
| 50 | static ssize_t bus_kobj_attr_show(struct kobject *kobj, struct attribute *attr, |
| 51 | char *buf) |
| 52 | { |
| 53 | struct medialb_bus *bus = |
| 54 | container_of(kobj, struct medialb_bus, kobj_group); |
| 55 | struct bus_attr *xattr = container_of(attr, struct bus_attr, attr); |
| 56 | |
| 57 | if (!xattr->show) |
| 58 | return -EIO; |
| 59 | |
| 60 | return xattr->show(bus, buf); |
| 61 | } |
| 62 | |
| 63 | static ssize_t bus_kobj_attr_store(struct kobject *kobj, struct attribute *attr, |
| 64 | const char *buf, size_t count) |
| 65 | { |
Christian Gromm | ba3d7dd | 2015-07-24 16:11:53 +0200 | [diff] [blame] | 66 | struct medialb_bus *bus = |
| 67 | container_of(kobj, struct medialb_bus, kobj_group); |
| 68 | struct bus_attr *xattr = container_of(attr, struct bus_attr, attr); |
| 69 | |
| 70 | if (!xattr->store) |
| 71 | return -EIO; |
| 72 | |
Eva Rachel Retuya | 87f35f0 | 2016-02-21 15:29:38 +0800 | [diff] [blame] | 73 | return xattr->store(bus, buf, count); |
Christian Gromm | ba3d7dd | 2015-07-24 16:11:53 +0200 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | static struct sysfs_ops const bus_kobj_sysfs_ops = { |
| 77 | .show = bus_kobj_attr_show, |
| 78 | .store = bus_kobj_attr_store, |
| 79 | }; |
| 80 | |
| 81 | static struct kobj_type bus_ktype = { |
| 82 | .release = bus_kobj_release, |
| 83 | .sysfs_ops = &bus_kobj_sysfs_ops, |
| 84 | }; |
| 85 | |
| 86 | int dim2_sysfs_probe(struct medialb_bus *bus, struct kobject *parent_kobj) |
| 87 | { |
| 88 | int err; |
| 89 | |
| 90 | kobject_init(&bus->kobj_group, &bus_ktype); |
| 91 | err = kobject_add(&bus->kobj_group, parent_kobj, "bus"); |
| 92 | if (err) { |
| 93 | pr_err("kobject_add() failed: %d\n", err); |
| 94 | goto err_kobject_add; |
| 95 | } |
| 96 | |
| 97 | err = sysfs_create_group(&bus->kobj_group, &bus_attr_group); |
| 98 | if (err) { |
| 99 | pr_err("sysfs_create_group() failed: %d\n", err); |
| 100 | goto err_create_group; |
| 101 | } |
| 102 | |
| 103 | return 0; |
| 104 | |
| 105 | err_create_group: |
| 106 | kobject_put(&bus->kobj_group); |
| 107 | |
| 108 | err_kobject_add: |
| 109 | return err; |
| 110 | } |
| 111 | |
| 112 | void dim2_sysfs_destroy(struct medialb_bus *bus) |
| 113 | { |
| 114 | kobject_put(&bus->kobj_group); |
| 115 | } |