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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * 1-Wire implementation for the ds2780 chip
4 *
5 * Copyright (C) 2010 Indesign, LLC
6 *
7 * Author: Clifton Barnes <cabarnes@indesign-llc.com>
8 *
9 * Based on w1-ds2760 driver
10 */
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/device.h>
15#include <linux/types.h>
16#include <linux/platform_device.h>
17#include <linux/mutex.h>
18#include <linux/idr.h>
19
20#include <linux/w1.h>
21
22#include "w1_ds2780.h"
23
24#define W1_FAMILY_DS2780 0x32
25
26static int w1_ds2780_do_io(struct device *dev, char *buf, int addr,
27 size_t count, int io)
28{
29 struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
30
31 if (addr > DS2780_DATA_SIZE || addr < 0)
32 return 0;
33
34 count = min_t(int, count, DS2780_DATA_SIZE - addr);
35
36 if (w1_reset_select_slave(sl) == 0) {
37 if (io) {
38 w1_write_8(sl->master, W1_DS2780_WRITE_DATA);
39 w1_write_8(sl->master, addr);
40 w1_write_block(sl->master, buf, count);
41 } else {
42 w1_write_8(sl->master, W1_DS2780_READ_DATA);
43 w1_write_8(sl->master, addr);
44 count = w1_read_block(sl->master, buf, count);
45 }
46 }
47
48 return count;
49}
50
51int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count,
52 int io)
53{
54 struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
55 int ret;
56
57 if (!dev)
58 return -ENODEV;
59
60 mutex_lock(&sl->master->bus_mutex);
61
62 ret = w1_ds2780_do_io(dev, buf, addr, count, io);
63
64 mutex_unlock(&sl->master->bus_mutex);
65
66 return ret;
67}
68EXPORT_SYMBOL(w1_ds2780_io);
69
70int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd)
71{
72 struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
73
74 if (!dev)
75 return -EINVAL;
76
77 mutex_lock(&sl->master->bus_mutex);
78
79 if (w1_reset_select_slave(sl) == 0) {
80 w1_write_8(sl->master, cmd);
81 w1_write_8(sl->master, addr);
82 }
83
84 mutex_unlock(&sl->master->bus_mutex);
85 return 0;
86}
87EXPORT_SYMBOL(w1_ds2780_eeprom_cmd);
88
89static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
90 struct bin_attribute *bin_attr, char *buf,
91 loff_t off, size_t count)
92{
93 struct device *dev = kobj_to_dev(kobj);
94
95 return w1_ds2780_io(dev, buf, off, count, 0);
96}
97
98static BIN_ATTR_RO(w1_slave, DS2780_DATA_SIZE);
99
100static struct bin_attribute *w1_ds2780_bin_attrs[] = {
101 &bin_attr_w1_slave,
102 NULL,
103};
104
105static const struct attribute_group w1_ds2780_group = {
106 .bin_attrs = w1_ds2780_bin_attrs,
107};
108
109static const struct attribute_group *w1_ds2780_groups[] = {
110 &w1_ds2780_group,
111 NULL,
112};
113
114static int w1_ds2780_add_slave(struct w1_slave *sl)
115{
116 int ret;
117 struct platform_device *pdev;
118
119 pdev = platform_device_alloc("ds2780-battery", PLATFORM_DEVID_AUTO);
120 if (!pdev)
121 return -ENOMEM;
122 pdev->dev.parent = &sl->dev;
123
124 ret = platform_device_add(pdev);
125 if (ret)
126 goto pdev_add_failed;
127
128 dev_set_drvdata(&sl->dev, pdev);
129
130 return 0;
131
132pdev_add_failed:
133 platform_device_put(pdev);
134
135 return ret;
136}
137
138static void w1_ds2780_remove_slave(struct w1_slave *sl)
139{
140 struct platform_device *pdev = dev_get_drvdata(&sl->dev);
141
142 platform_device_unregister(pdev);
143}
144
145static const struct w1_family_ops w1_ds2780_fops = {
146 .add_slave = w1_ds2780_add_slave,
147 .remove_slave = w1_ds2780_remove_slave,
148 .groups = w1_ds2780_groups,
149};
150
151static struct w1_family w1_ds2780_family = {
152 .fid = W1_FAMILY_DS2780,
153 .fops = &w1_ds2780_fops,
154};
155module_w1_family(w1_ds2780_family);
156
157MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
158MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC");
159MODULE_LICENSE("GPL");
160MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2780));
1/*
2 * 1-Wire implementation for the ds2780 chip
3 *
4 * Copyright (C) 2010 Indesign, LLC
5 *
6 * Author: Clifton Barnes <cabarnes@indesign-llc.com>
7 *
8 * Based on w1-ds2760 driver
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/device.h>
19#include <linux/types.h>
20#include <linux/platform_device.h>
21#include <linux/mutex.h>
22#include <linux/idr.h>
23
24#include "../w1.h"
25#include "../w1_int.h"
26#include "../w1_family.h"
27#include "w1_ds2780.h"
28
29static int w1_ds2780_do_io(struct device *dev, char *buf, int addr,
30 size_t count, int io)
31{
32 struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
33
34 if (addr > DS2780_DATA_SIZE || addr < 0)
35 return 0;
36
37 count = min_t(int, count, DS2780_DATA_SIZE - addr);
38
39 if (w1_reset_select_slave(sl) == 0) {
40 if (io) {
41 w1_write_8(sl->master, W1_DS2780_WRITE_DATA);
42 w1_write_8(sl->master, addr);
43 w1_write_block(sl->master, buf, count);
44 } else {
45 w1_write_8(sl->master, W1_DS2780_READ_DATA);
46 w1_write_8(sl->master, addr);
47 count = w1_read_block(sl->master, buf, count);
48 }
49 }
50
51 return count;
52}
53
54int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count,
55 int io)
56{
57 struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
58 int ret;
59
60 if (!dev)
61 return -ENODEV;
62
63 mutex_lock(&sl->master->bus_mutex);
64
65 ret = w1_ds2780_do_io(dev, buf, addr, count, io);
66
67 mutex_unlock(&sl->master->bus_mutex);
68
69 return ret;
70}
71EXPORT_SYMBOL(w1_ds2780_io);
72
73int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd)
74{
75 struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
76
77 if (!dev)
78 return -EINVAL;
79
80 mutex_lock(&sl->master->bus_mutex);
81
82 if (w1_reset_select_slave(sl) == 0) {
83 w1_write_8(sl->master, cmd);
84 w1_write_8(sl->master, addr);
85 }
86
87 mutex_unlock(&sl->master->bus_mutex);
88 return 0;
89}
90EXPORT_SYMBOL(w1_ds2780_eeprom_cmd);
91
92static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
93 struct bin_attribute *bin_attr, char *buf,
94 loff_t off, size_t count)
95{
96 struct device *dev = container_of(kobj, struct device, kobj);
97 return w1_ds2780_io(dev, buf, off, count, 0);
98}
99
100static BIN_ATTR_RO(w1_slave, DS2780_DATA_SIZE);
101
102static struct bin_attribute *w1_ds2780_bin_attrs[] = {
103 &bin_attr_w1_slave,
104 NULL,
105};
106
107static const struct attribute_group w1_ds2780_group = {
108 .bin_attrs = w1_ds2780_bin_attrs,
109};
110
111static const struct attribute_group *w1_ds2780_groups[] = {
112 &w1_ds2780_group,
113 NULL,
114};
115
116static DEFINE_IDA(bat_ida);
117
118static int w1_ds2780_add_slave(struct w1_slave *sl)
119{
120 int ret;
121 int id;
122 struct platform_device *pdev;
123
124 id = ida_simple_get(&bat_ida, 0, 0, GFP_KERNEL);
125 if (id < 0) {
126 ret = id;
127 goto noid;
128 }
129
130 pdev = platform_device_alloc("ds2780-battery", id);
131 if (!pdev) {
132 ret = -ENOMEM;
133 goto pdev_alloc_failed;
134 }
135 pdev->dev.parent = &sl->dev;
136
137 ret = platform_device_add(pdev);
138 if (ret)
139 goto pdev_add_failed;
140
141 dev_set_drvdata(&sl->dev, pdev);
142
143 return 0;
144
145pdev_add_failed:
146 platform_device_put(pdev);
147pdev_alloc_failed:
148 ida_simple_remove(&bat_ida, id);
149noid:
150 return ret;
151}
152
153static void w1_ds2780_remove_slave(struct w1_slave *sl)
154{
155 struct platform_device *pdev = dev_get_drvdata(&sl->dev);
156 int id = pdev->id;
157
158 platform_device_unregister(pdev);
159 ida_simple_remove(&bat_ida, id);
160}
161
162static struct w1_family_ops w1_ds2780_fops = {
163 .add_slave = w1_ds2780_add_slave,
164 .remove_slave = w1_ds2780_remove_slave,
165 .groups = w1_ds2780_groups,
166};
167
168static struct w1_family w1_ds2780_family = {
169 .fid = W1_FAMILY_DS2780,
170 .fops = &w1_ds2780_fops,
171};
172
173static int __init w1_ds2780_init(void)
174{
175 ida_init(&bat_ida);
176 return w1_register_family(&w1_ds2780_family);
177}
178
179static void __exit w1_ds2780_exit(void)
180{
181 w1_unregister_family(&w1_ds2780_family);
182 ida_destroy(&bat_ida);
183}
184
185module_init(w1_ds2780_init);
186module_exit(w1_ds2780_exit);
187
188MODULE_LICENSE("GPL");
189MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
190MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC");
191MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2780));