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fef37e9a RS |
1 | /* |
2 | * 1-Wire implementation for the ds2781 chip | |
3 | * | |
4 | * Author: Renata Sayakhova <renata@oktetlabs.ru> | |
5 | * | |
6 | * Based on w1-ds2780 driver | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/mutex.h> | |
fef37e9a | 20 | |
de0d6dbd AD |
21 | #include <linux/w1.h> |
22 | ||
fef37e9a RS |
23 | #include "w1_ds2781.h" |
24 | ||
de0d6dbd AD |
25 | #define W1_FAMILY_DS2781 0x3D |
26 | ||
fef37e9a RS |
27 | static int w1_ds2781_do_io(struct device *dev, char *buf, int addr, |
28 | size_t count, int io) | |
29 | { | |
30 | struct w1_slave *sl = container_of(dev, struct w1_slave, dev); | |
31 | ||
32 | if (addr > DS2781_DATA_SIZE || addr < 0) | |
33 | return 0; | |
34 | ||
35 | count = min_t(int, count, DS2781_DATA_SIZE - addr); | |
36 | ||
37 | if (w1_reset_select_slave(sl) == 0) { | |
38 | if (io) { | |
39 | w1_write_8(sl->master, W1_DS2781_WRITE_DATA); | |
40 | w1_write_8(sl->master, addr); | |
41 | w1_write_block(sl->master, buf, count); | |
42 | } else { | |
43 | w1_write_8(sl->master, W1_DS2781_READ_DATA); | |
44 | w1_write_8(sl->master, addr); | |
45 | count = w1_read_block(sl->master, buf, count); | |
46 | } | |
47 | } | |
48 | ||
49 | return count; | |
50 | } | |
51 | ||
52 | int w1_ds2781_io(struct device *dev, char *buf, int addr, size_t count, | |
53 | int io) | |
54 | { | |
55 | struct w1_slave *sl = container_of(dev, struct w1_slave, dev); | |
56 | int ret; | |
57 | ||
58 | if (!dev) | |
59 | return -ENODEV; | |
60 | ||
b02f8bed | 61 | mutex_lock(&sl->master->bus_mutex); |
fef37e9a RS |
62 | |
63 | ret = w1_ds2781_do_io(dev, buf, addr, count, io); | |
64 | ||
b02f8bed | 65 | mutex_unlock(&sl->master->bus_mutex); |
fef37e9a RS |
66 | |
67 | return ret; | |
68 | } | |
69 | EXPORT_SYMBOL(w1_ds2781_io); | |
70 | ||
fef37e9a RS |
71 | int w1_ds2781_eeprom_cmd(struct device *dev, int addr, int cmd) |
72 | { | |
73 | struct w1_slave *sl = container_of(dev, struct w1_slave, dev); | |
74 | ||
75 | if (!dev) | |
76 | return -EINVAL; | |
77 | ||
b02f8bed | 78 | mutex_lock(&sl->master->bus_mutex); |
fef37e9a RS |
79 | |
80 | if (w1_reset_select_slave(sl) == 0) { | |
81 | w1_write_8(sl->master, cmd); | |
82 | w1_write_8(sl->master, addr); | |
83 | } | |
84 | ||
b02f8bed | 85 | mutex_unlock(&sl->master->bus_mutex); |
fef37e9a RS |
86 | return 0; |
87 | } | |
88 | EXPORT_SYMBOL(w1_ds2781_eeprom_cmd); | |
89 | ||
eefafb79 GKH |
90 | static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj, |
91 | struct bin_attribute *bin_attr, char *buf, | |
92 | loff_t off, size_t count) | |
fef37e9a RS |
93 | { |
94 | struct device *dev = container_of(kobj, struct device, kobj); | |
95 | return w1_ds2781_io(dev, buf, off, count, 0); | |
96 | } | |
97 | ||
eefafb79 GKH |
98 | static BIN_ATTR_RO(w1_slave, DS2781_DATA_SIZE); |
99 | ||
100 | static struct bin_attribute *w1_ds2781_bin_attrs[] = { | |
101 | &bin_attr_w1_slave, | |
102 | NULL, | |
103 | }; | |
104 | ||
105 | static const struct attribute_group w1_ds2781_group = { | |
106 | .bin_attrs = w1_ds2781_bin_attrs, | |
107 | }; | |
108 | ||
109 | static const struct attribute_group *w1_ds2781_groups[] = { | |
110 | &w1_ds2781_group, | |
111 | NULL, | |
fef37e9a RS |
112 | }; |
113 | ||
fef37e9a RS |
114 | static int w1_ds2781_add_slave(struct w1_slave *sl) |
115 | { | |
116 | int ret; | |
fef37e9a RS |
117 | struct platform_device *pdev; |
118 | ||
098f9fb0 AD |
119 | pdev = platform_device_alloc("ds2781-battery", PLATFORM_DEVID_AUTO); |
120 | if (!pdev) | |
121 | return -ENOMEM; | |
fef37e9a RS |
122 | pdev->dev.parent = &sl->dev; |
123 | ||
124 | ret = platform_device_add(pdev); | |
125 | if (ret) | |
126 | goto pdev_add_failed; | |
127 | ||
fef37e9a RS |
128 | dev_set_drvdata(&sl->dev, pdev); |
129 | ||
130 | return 0; | |
131 | ||
fef37e9a | 132 | pdev_add_failed: |
c28d6f2d | 133 | platform_device_put(pdev); |
098f9fb0 | 134 | |
fef37e9a RS |
135 | return ret; |
136 | } | |
137 | ||
138 | static void w1_ds2781_remove_slave(struct w1_slave *sl) | |
139 | { | |
140 | struct platform_device *pdev = dev_get_drvdata(&sl->dev); | |
fef37e9a RS |
141 | |
142 | platform_device_unregister(pdev); | |
fef37e9a RS |
143 | } |
144 | ||
145 | static struct w1_family_ops w1_ds2781_fops = { | |
146 | .add_slave = w1_ds2781_add_slave, | |
147 | .remove_slave = w1_ds2781_remove_slave, | |
eefafb79 | 148 | .groups = w1_ds2781_groups, |
fef37e9a RS |
149 | }; |
150 | ||
151 | static struct w1_family w1_ds2781_family = { | |
152 | .fid = W1_FAMILY_DS2781, | |
153 | .fops = &w1_ds2781_fops, | |
154 | }; | |
939fc832 | 155 | module_w1_family(w1_ds2781_family); |
fef37e9a | 156 | |
fef37e9a RS |
157 | MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>"); |
158 | MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC"); | |
50fa2951 | 159 | MODULE_LICENSE("GPL"); |
8d7bda51 | 160 | MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2781)); |