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1da177e4 LT |
1 | /* |
2 | * w1_smem.c | |
3 | * | |
4 | * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> | |
5 | * | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the smems of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <asm/types.h> | |
23 | ||
24 | #include <linux/kernel.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/moduleparam.h> | |
27 | #include <linux/device.h> | |
28 | #include <linux/types.h> | |
29 | ||
30 | #include "w1.h" | |
31 | #include "w1_io.h" | |
32 | #include "w1_int.h" | |
33 | #include "w1_family.h" | |
34 | ||
35 | MODULE_LICENSE("GPL"); | |
36 | MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); | |
37 | MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, 64bit memory family."); | |
38 | ||
060b8845 YI |
39 | static ssize_t w1_smem_read_name(struct device *, struct device_attribute *attr, char *); |
40 | static ssize_t w1_smem_read_val(struct device *, struct device_attribute *attr, char *); | |
1da177e4 LT |
41 | static ssize_t w1_smem_read_bin(struct kobject *, char *, loff_t, size_t); |
42 | ||
43 | static struct w1_family_ops w1_smem_fops = { | |
44 | .rname = &w1_smem_read_name, | |
45 | .rbin = &w1_smem_read_bin, | |
46 | .rval = &w1_smem_read_val, | |
47 | .rvalname = "id", | |
48 | }; | |
49 | ||
060b8845 | 50 | static ssize_t w1_smem_read_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
51 | { |
52 | struct w1_slave *sl = container_of(dev, struct w1_slave, dev); | |
53 | ||
54 | return sprintf(buf, "%s\n", sl->name); | |
55 | } | |
56 | ||
060b8845 | 57 | static ssize_t w1_smem_read_val(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
58 | { |
59 | struct w1_slave *sl = container_of(dev, struct w1_slave, dev); | |
60 | int i; | |
61 | ssize_t count = 0; | |
62 | ||
05985715 | 63 | for (i = 0; i < 8; ++i) |
1da177e4 LT |
64 | count += sprintf(buf + count, "%02x ", ((u8 *)&sl->reg_num)[i]); |
65 | count += sprintf(buf + count, "\n"); | |
66 | ||
67 | return count; | |
68 | } | |
69 | ||
70 | static ssize_t w1_smem_read_bin(struct kobject *kobj, char *buf, loff_t off, size_t count) | |
71 | { | |
72 | struct w1_slave *sl = container_of(container_of(kobj, struct device, kobj), | |
73 | struct w1_slave, dev); | |
74 | int i; | |
75 | ||
76 | atomic_inc(&sl->refcnt); | |
77 | if (down_interruptible(&sl->master->mutex)) { | |
78 | count = 0; | |
79 | goto out_dec; | |
80 | } | |
81 | ||
82 | if (off > W1_SLAVE_DATA_SIZE) { | |
83 | count = 0; | |
84 | goto out; | |
85 | } | |
86 | if (off + count > W1_SLAVE_DATA_SIZE) { | |
87 | count = 0; | |
88 | goto out; | |
89 | } | |
05985715 | 90 | for (i = 0; i < 8; ++i) |
1da177e4 LT |
91 | count += sprintf(buf + count, "%02x ", ((u8 *)&sl->reg_num)[i]); |
92 | count += sprintf(buf + count, "\n"); | |
93 | ||
94 | out: | |
95 | up(&sl->master->mutex); | |
96 | out_dec: | |
97 | atomic_dec(&sl->refcnt); | |
98 | ||
99 | return count; | |
100 | } | |
101 | ||
102 | static struct w1_family w1_smem_family = { | |
103 | .fid = W1_FAMILY_SMEM, | |
104 | .fops = &w1_smem_fops, | |
105 | }; | |
106 | ||
107 | static int __init w1_smem_init(void) | |
108 | { | |
109 | return w1_register_family(&w1_smem_family); | |
110 | } | |
111 | ||
112 | static void __exit w1_smem_fini(void) | |
113 | { | |
114 | w1_unregister_family(&w1_smem_family); | |
115 | } | |
116 | ||
117 | module_init(w1_smem_init); | |
118 | module_exit(w1_smem_fini); |