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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>
20#include <linux/idr.h>
21
22#include "../w1.h"
23#include "../w1_int.h"
24#include "../w1_family.h"
25#include "w1_ds2781.h"
26
27static 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
52int 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
61 mutex_lock(&sl->master->bus_mutex);
62
63 ret = w1_ds2781_do_io(dev, buf, addr, count, io);
64
65 mutex_unlock(&sl->master->bus_mutex);
66
67 return ret;
68}
69EXPORT_SYMBOL(w1_ds2781_io);
70
71int 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
78 mutex_lock(&sl->master->bus_mutex);
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
85 mutex_unlock(&sl->master->bus_mutex);
86 return 0;
87}
88EXPORT_SYMBOL(w1_ds2781_eeprom_cmd);
89
90static ssize_t w1_ds2781_read_bin(struct file *filp,
91 struct kobject *kobj,
92 struct bin_attribute *bin_attr,
93 char *buf, loff_t off, size_t count)
94{
95 struct device *dev = container_of(kobj, struct device, kobj);
96 return w1_ds2781_io(dev, buf, off, count, 0);
97}
98
99static struct bin_attribute w1_ds2781_bin_attr = {
100 .attr = {
101 .name = "w1_slave",
102 .mode = S_IRUGO,
103 },
104 .size = DS2781_DATA_SIZE,
105 .read = w1_ds2781_read_bin,
106};
107
108static DEFINE_IDA(bat_ida);
109
110static int w1_ds2781_add_slave(struct w1_slave *sl)
111{
112 int ret;
113 int id;
114 struct platform_device *pdev;
115
116 id = ida_simple_get(&bat_ida, 0, 0, GFP_KERNEL);
117 if (id < 0) {
118 ret = id;
119 goto noid;
120 }
121
122 pdev = platform_device_alloc("ds2781-battery", id);
123 if (!pdev) {
124 ret = -ENOMEM;
125 goto pdev_alloc_failed;
126 }
127 pdev->dev.parent = &sl->dev;
128
129 ret = platform_device_add(pdev);
130 if (ret)
131 goto pdev_add_failed;
132
133 ret = sysfs_create_bin_file(&sl->dev.kobj, &w1_ds2781_bin_attr);
134 if (ret)
135 goto bin_attr_failed;
136
137 dev_set_drvdata(&sl->dev, pdev);
138
139 return 0;
140
141bin_attr_failed:
142 platform_device_del(pdev);
143pdev_add_failed:
144 platform_device_put(pdev);
145pdev_alloc_failed:
146 ida_simple_remove(&bat_ida, id);
147noid:
148 return ret;
149}
150
151static void w1_ds2781_remove_slave(struct w1_slave *sl)
152{
153 struct platform_device *pdev = dev_get_drvdata(&sl->dev);
154 int id = pdev->id;
155
156 platform_device_unregister(pdev);
157 ida_simple_remove(&bat_ida, id);
158 sysfs_remove_bin_file(&sl->dev.kobj, &w1_ds2781_bin_attr);
159}
160
161static struct w1_family_ops w1_ds2781_fops = {
162 .add_slave = w1_ds2781_add_slave,
163 .remove_slave = w1_ds2781_remove_slave,
164};
165
166static struct w1_family w1_ds2781_family = {
167 .fid = W1_FAMILY_DS2781,
168 .fops = &w1_ds2781_fops,
169};
170
171static int __init w1_ds2781_init(void)
172{
173 ida_init(&bat_ida);
174 return w1_register_family(&w1_ds2781_family);
175}
176
177static void __exit w1_ds2781_exit(void)
178{
179 w1_unregister_family(&w1_ds2781_family);
180 ida_destroy(&bat_ida);
181}
182
183module_init(w1_ds2781_init);
184module_exit(w1_ds2781_exit);
185
186MODULE_LICENSE("GPL");
187MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
188MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC");
189MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2781));
190
