This source file includes following definitions.
- ltc4260_get_value
- ltc4260_value_show
- ltc4260_bool_show
- ltc4260_probe
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8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/err.h>
11 #include <linux/slab.h>
12 #include <linux/i2c.h>
13 #include <linux/hwmon.h>
14 #include <linux/hwmon-sysfs.h>
15 #include <linux/jiffies.h>
16 #include <linux/regmap.h>
17
18
19 #define LTC4260_CONTROL 0x00
20 #define LTC4260_ALERT 0x01
21 #define LTC4260_STATUS 0x02
22 #define LTC4260_FAULT 0x03
23 #define LTC4260_SENSE 0x04
24 #define LTC4260_SOURCE 0x05
25 #define LTC4260_ADIN 0x06
26
27
28
29
30 #define FAULT_OV (1 << 0)
31 #define FAULT_UV (1 << 1)
32 #define FAULT_OC (1 << 2)
33 #define FAULT_POWER_BAD (1 << 3)
34 #define FAULT_FET_SHORT (1 << 5)
35
36
37 static int ltc4260_get_value(struct device *dev, u8 reg)
38 {
39 struct regmap *regmap = dev_get_drvdata(dev);
40 unsigned int val;
41 int ret;
42
43 ret = regmap_read(regmap, reg, &val);
44 if (ret < 0)
45 return ret;
46
47 switch (reg) {
48 case LTC4260_ADIN:
49
50 val = val * 10;
51 break;
52 case LTC4260_SOURCE:
53
54 val = val * 400;
55 break;
56 case LTC4260_SENSE:
57
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62
63
64 val = val * 300;
65 break;
66 default:
67 return -EINVAL;
68 }
69
70 return val;
71 }
72
73 static ssize_t ltc4260_value_show(struct device *dev,
74 struct device_attribute *da, char *buf)
75 {
76 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
77 int value;
78
79 value = ltc4260_get_value(dev, attr->index);
80 if (value < 0)
81 return value;
82 return snprintf(buf, PAGE_SIZE, "%d\n", value);
83 }
84
85 static ssize_t ltc4260_bool_show(struct device *dev,
86 struct device_attribute *da, char *buf)
87 {
88 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
89 struct regmap *regmap = dev_get_drvdata(dev);
90 unsigned int fault;
91 int ret;
92
93 ret = regmap_read(regmap, LTC4260_FAULT, &fault);
94 if (ret < 0)
95 return ret;
96
97 fault &= attr->index;
98 if (fault)
99 regmap_update_bits(regmap, LTC4260_FAULT, attr->index, 0);
100
101 return snprintf(buf, PAGE_SIZE, "%d\n", !!fault);
102 }
103
104
105 static SENSOR_DEVICE_ATTR_RO(in1_input, ltc4260_value, LTC4260_SOURCE);
106 static SENSOR_DEVICE_ATTR_RO(in2_input, ltc4260_value, LTC4260_ADIN);
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113 static SENSOR_DEVICE_ATTR_RO(in1_min_alarm, ltc4260_bool, FAULT_UV);
114 static SENSOR_DEVICE_ATTR_RO(in1_max_alarm, ltc4260_bool, FAULT_OV);
115 static SENSOR_DEVICE_ATTR_RO(in2_alarm, ltc4260_bool,
116 FAULT_POWER_BAD | FAULT_FET_SHORT);
117
118
119 static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc4260_value, LTC4260_SENSE);
120
121
122 static SENSOR_DEVICE_ATTR_RO(curr1_max_alarm, ltc4260_bool, FAULT_OC);
123
124 static struct attribute *ltc4260_attrs[] = {
125 &sensor_dev_attr_in1_input.dev_attr.attr,
126 &sensor_dev_attr_in1_min_alarm.dev_attr.attr,
127 &sensor_dev_attr_in1_max_alarm.dev_attr.attr,
128 &sensor_dev_attr_in2_input.dev_attr.attr,
129 &sensor_dev_attr_in2_alarm.dev_attr.attr,
130
131 &sensor_dev_attr_curr1_input.dev_attr.attr,
132 &sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
133
134 NULL,
135 };
136 ATTRIBUTE_GROUPS(ltc4260);
137
138 static const struct regmap_config ltc4260_regmap_config = {
139 .reg_bits = 8,
140 .val_bits = 8,
141 .max_register = LTC4260_ADIN,
142 };
143
144 static int ltc4260_probe(struct i2c_client *client,
145 const struct i2c_device_id *id)
146 {
147 struct device *dev = &client->dev;
148 struct device *hwmon_dev;
149 struct regmap *regmap;
150
151 regmap = devm_regmap_init_i2c(client, <c4260_regmap_config);
152 if (IS_ERR(regmap)) {
153 dev_err(dev, "failed to allocate register map\n");
154 return PTR_ERR(regmap);
155 }
156
157
158 regmap_write(regmap, LTC4260_FAULT, 0x00);
159
160 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
161 regmap,
162 ltc4260_groups);
163 return PTR_ERR_OR_ZERO(hwmon_dev);
164 }
165
166 static const struct i2c_device_id ltc4260_id[] = {
167 {"ltc4260", 0},
168 { }
169 };
170
171 MODULE_DEVICE_TABLE(i2c, ltc4260_id);
172
173 static struct i2c_driver ltc4260_driver = {
174 .driver = {
175 .name = "ltc4260",
176 },
177 .probe = ltc4260_probe,
178 .id_table = ltc4260_id,
179 };
180
181 module_i2c_driver(ltc4260_driver);
182
183 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
184 MODULE_DESCRIPTION("LTC4260 driver");
185 MODULE_LICENSE("GPL");