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2aefbef0 MR |
1 | /* |
2 | * Remote Processor Framework | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * version 2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | ||
14 | #include <linux/remoteproc.h> | |
15 | ||
16 | #include "remoteproc_internal.h" | |
17 | ||
18 | #define to_rproc(d) container_of(d, struct rproc, dev) | |
19 | ||
20 | /* Expose the loaded / running firmware name via sysfs */ | |
21 | static ssize_t firmware_show(struct device *dev, struct device_attribute *attr, | |
22 | char *buf) | |
23 | { | |
24 | struct rproc *rproc = to_rproc(dev); | |
25 | ||
26 | return sprintf(buf, "%s\n", rproc->firmware); | |
27 | } | |
28 | ||
29 | /* Change firmware name via sysfs */ | |
30 | static ssize_t firmware_store(struct device *dev, | |
31 | struct device_attribute *attr, | |
32 | const char *buf, size_t count) | |
33 | { | |
34 | struct rproc *rproc = to_rproc(dev); | |
35 | char *p; | |
36 | int err, len = count; | |
37 | ||
38 | err = mutex_lock_interruptible(&rproc->lock); | |
39 | if (err) { | |
40 | dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, err); | |
41 | return -EINVAL; | |
42 | } | |
43 | ||
44 | if (rproc->state != RPROC_OFFLINE) { | |
45 | dev_err(dev, "can't change firmware while running\n"); | |
46 | err = -EBUSY; | |
47 | goto out; | |
48 | } | |
49 | ||
50 | len = strcspn(buf, "\n"); | |
51 | ||
52 | p = kstrndup(buf, len, GFP_KERNEL); | |
53 | if (!p) { | |
54 | err = -ENOMEM; | |
55 | goto out; | |
56 | } | |
57 | ||
58 | kfree(rproc->firmware); | |
59 | rproc->firmware = p; | |
60 | out: | |
61 | mutex_unlock(&rproc->lock); | |
62 | ||
63 | return err ? err : count; | |
64 | } | |
65 | static DEVICE_ATTR_RW(firmware); | |
66 | ||
67 | /* | |
68 | * A state-to-string lookup table, for exposing a human readable state | |
69 | * via sysfs. Always keep in sync with enum rproc_state | |
70 | */ | |
71 | static const char * const rproc_state_string[] = { | |
72 | [RPROC_OFFLINE] = "offline", | |
73 | [RPROC_SUSPENDED] = "suspended", | |
74 | [RPROC_RUNNING] = "running", | |
75 | [RPROC_CRASHED] = "crashed", | |
76 | [RPROC_LAST] = "invalid", | |
77 | }; | |
78 | ||
79 | /* Expose the state of the remote processor via sysfs */ | |
80 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, | |
81 | char *buf) | |
82 | { | |
83 | struct rproc *rproc = to_rproc(dev); | |
84 | unsigned int state; | |
85 | ||
86 | state = rproc->state > RPROC_LAST ? RPROC_LAST : rproc->state; | |
87 | return sprintf(buf, "%s\n", rproc_state_string[state]); | |
88 | } | |
89 | ||
90 | /* Change remote processor state via sysfs */ | |
91 | static ssize_t state_store(struct device *dev, | |
92 | struct device_attribute *attr, | |
93 | const char *buf, size_t count) | |
94 | { | |
95 | struct rproc *rproc = to_rproc(dev); | |
96 | int ret = 0; | |
97 | ||
98 | if (sysfs_streq(buf, "start")) { | |
99 | if (rproc->state == RPROC_RUNNING) | |
100 | return -EBUSY; | |
101 | ||
102 | ret = rproc_boot(rproc); | |
103 | if (ret) | |
104 | dev_err(&rproc->dev, "Boot failed: %d\n", ret); | |
105 | } else if (sysfs_streq(buf, "stop")) { | |
106 | if (rproc->state != RPROC_RUNNING) | |
107 | return -EINVAL; | |
108 | ||
109 | rproc_shutdown(rproc); | |
110 | } else { | |
111 | dev_err(&rproc->dev, "Unrecognised option: %s\n", buf); | |
112 | ret = -EINVAL; | |
113 | } | |
114 | return ret ? ret : count; | |
115 | } | |
116 | static DEVICE_ATTR_RW(state); | |
117 | ||
118 | static struct attribute *rproc_attrs[] = { | |
119 | &dev_attr_firmware.attr, | |
120 | &dev_attr_state.attr, | |
121 | NULL | |
122 | }; | |
123 | ||
124 | static const struct attribute_group rproc_devgroup = { | |
125 | .attrs = rproc_attrs | |
126 | }; | |
127 | ||
128 | static const struct attribute_group *rproc_devgroups[] = { | |
129 | &rproc_devgroup, | |
130 | NULL | |
131 | }; | |
132 | ||
133 | struct class rproc_class = { | |
134 | .name = "remoteproc", | |
135 | .dev_groups = rproc_devgroups, | |
136 | }; | |
137 | ||
138 | int __init rproc_init_sysfs(void) | |
139 | { | |
140 | /* create remoteproc device class for sysfs */ | |
141 | int err = class_register(&rproc_class); | |
142 | ||
143 | if (err) | |
144 | pr_err("remoteproc: unable to register class\n"); | |
145 | return err; | |
146 | } | |
147 | ||
148 | void __exit rproc_exit_sysfs(void) | |
149 | { | |
150 | class_unregister(&rproc_class); | |
151 | } |