Commit | Line | Data |
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df922703 ML |
1 | /* |
2 | * Driver for Linear Technology LTC2990 power monitor | |
3 | * | |
4 | * Copyright (C) 2014 Topic Embedded Products | |
5 | * Author: Mike Looijmans <mike.looijmans@topic.nl> | |
6 | * | |
7 | * License: GPLv2 | |
df922703 ML |
8 | */ |
9 | ||
a6282d17 | 10 | #include <linux/bitops.h> |
df922703 ML |
11 | #include <linux/err.h> |
12 | #include <linux/hwmon.h> | |
13 | #include <linux/hwmon-sysfs.h> | |
14 | #include <linux/i2c.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/module.h> | |
5d9ca430 | 17 | #include <linux/of.h> |
df922703 ML |
18 | |
19 | #define LTC2990_STATUS 0x00 | |
20 | #define LTC2990_CONTROL 0x01 | |
21 | #define LTC2990_TRIGGER 0x02 | |
22 | #define LTC2990_TINT_MSB 0x04 | |
23 | #define LTC2990_V1_MSB 0x06 | |
24 | #define LTC2990_V2_MSB 0x08 | |
25 | #define LTC2990_V3_MSB 0x0A | |
26 | #define LTC2990_V4_MSB 0x0C | |
27 | #define LTC2990_VCC_MSB 0x0E | |
28 | ||
5d9ca430 TL |
29 | #define LTC2990_IN0 BIT(0) |
30 | #define LTC2990_IN1 BIT(1) | |
31 | #define LTC2990_IN2 BIT(2) | |
32 | #define LTC2990_IN3 BIT(3) | |
33 | #define LTC2990_IN4 BIT(4) | |
34 | #define LTC2990_CURR1 BIT(5) | |
35 | #define LTC2990_CURR2 BIT(6) | |
36 | #define LTC2990_TEMP1 BIT(7) | |
37 | #define LTC2990_TEMP2 BIT(8) | |
38 | #define LTC2990_TEMP3 BIT(9) | |
39 | #define LTC2990_NONE 0 | |
40 | #define LTC2990_ALL GENMASK(9, 0) | |
41 | ||
42 | #define LTC2990_MODE0_SHIFT 0 | |
43 | #define LTC2990_MODE0_MASK GENMASK(2, 0) | |
44 | #define LTC2990_MODE1_SHIFT 3 | |
45 | #define LTC2990_MODE1_MASK GENMASK(1, 0) | |
46 | ||
47 | /* Enabled measurements for mode bits 2..0 */ | |
48 | static const int ltc2990_attrs_ena_0[] = { | |
49 | LTC2990_IN1 | LTC2990_IN2 | LTC2990_TEMP3, | |
50 | LTC2990_CURR1 | LTC2990_TEMP3, | |
51 | LTC2990_CURR1 | LTC2990_IN3 | LTC2990_IN4, | |
52 | LTC2990_TEMP2 | LTC2990_IN3 | LTC2990_IN4, | |
53 | LTC2990_TEMP2 | LTC2990_CURR2, | |
54 | LTC2990_TEMP2 | LTC2990_TEMP3, | |
55 | LTC2990_CURR1 | LTC2990_CURR2, | |
56 | LTC2990_IN1 | LTC2990_IN2 | LTC2990_IN3 | LTC2990_IN4 | |
57 | }; | |
58 | ||
59 | /* Enabled measurements for mode bits 4..3 */ | |
60 | static const int ltc2990_attrs_ena_1[] = { | |
61 | LTC2990_NONE, | |
62 | LTC2990_TEMP2 | LTC2990_IN1 | LTC2990_CURR1, | |
63 | LTC2990_TEMP3 | LTC2990_IN3 | LTC2990_CURR2, | |
64 | LTC2990_ALL | |
65 | }; | |
66 | ||
67 | struct ltc2990_data { | |
68 | struct i2c_client *i2c; | |
69 | u32 mode[2]; | |
70 | }; | |
df922703 | 71 | |
df922703 | 72 | /* Return the converted value from the given register in uV or mC */ |
5d9ca430 | 73 | static int ltc2990_get_value(struct i2c_client *i2c, int index, int *result) |
df922703 ML |
74 | { |
75 | int val; | |
5d9ca430 TL |
76 | u8 reg; |
77 | ||
78 | switch (index) { | |
79 | case LTC2990_IN0: | |
80 | reg = LTC2990_VCC_MSB; | |
81 | break; | |
82 | case LTC2990_IN1: | |
83 | case LTC2990_CURR1: | |
84 | case LTC2990_TEMP2: | |
85 | reg = LTC2990_V1_MSB; | |
86 | break; | |
87 | case LTC2990_IN2: | |
88 | reg = LTC2990_V2_MSB; | |
89 | break; | |
90 | case LTC2990_IN3: | |
91 | case LTC2990_CURR2: | |
92 | case LTC2990_TEMP3: | |
93 | reg = LTC2990_V3_MSB; | |
94 | break; | |
95 | case LTC2990_IN4: | |
96 | reg = LTC2990_V4_MSB; | |
97 | break; | |
98 | case LTC2990_TEMP1: | |
99 | reg = LTC2990_TINT_MSB; | |
100 | break; | |
101 | default: | |
102 | return -EINVAL; | |
103 | } | |
df922703 ML |
104 | |
105 | val = i2c_smbus_read_word_swapped(i2c, reg); | |
106 | if (unlikely(val < 0)) | |
107 | return val; | |
108 | ||
5d9ca430 TL |
109 | switch (index) { |
110 | case LTC2990_TEMP1: | |
111 | case LTC2990_TEMP2: | |
112 | case LTC2990_TEMP3: | |
113 | /* temp, 0.0625 degrees/LSB */ | |
a6282d17 | 114 | *result = sign_extend32(val, 12) * 1000 / 16; |
df922703 | 115 | break; |
5d9ca430 TL |
116 | case LTC2990_CURR1: |
117 | case LTC2990_CURR2: | |
118 | /* Vx-Vy, 19.42uV/LSB */ | |
a6282d17 | 119 | *result = sign_extend32(val, 14) * 1942 / 100; |
df922703 | 120 | break; |
5d9ca430 TL |
121 | case LTC2990_IN0: |
122 | /* Vcc, 305.18uV/LSB, 2.5V offset */ | |
a6282d17 | 123 | *result = sign_extend32(val, 14) * 30518 / (100 * 1000) + 2500; |
df922703 | 124 | break; |
5d9ca430 TL |
125 | case LTC2990_IN1: |
126 | case LTC2990_IN2: | |
127 | case LTC2990_IN3: | |
128 | case LTC2990_IN4: | |
129 | /* Vx, 305.18uV/LSB */ | |
130 | *result = sign_extend32(val, 14) * 30518 / (100 * 1000); | |
131 | break; | |
df922703 ML |
132 | default: |
133 | return -EINVAL; /* won't happen, keep compiler happy */ | |
134 | } | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | static ssize_t ltc2990_show_value(struct device *dev, | |
140 | struct device_attribute *da, char *buf) | |
141 | { | |
142 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
5d9ca430 | 143 | struct ltc2990_data *data = dev_get_drvdata(dev); |
df922703 ML |
144 | int value; |
145 | int ret; | |
146 | ||
5d9ca430 | 147 | ret = ltc2990_get_value(data->i2c, attr->index, &value); |
df922703 ML |
148 | if (unlikely(ret < 0)) |
149 | return ret; | |
150 | ||
151 | return snprintf(buf, PAGE_SIZE, "%d\n", value); | |
152 | } | |
153 | ||
5d9ca430 TL |
154 | static umode_t ltc2990_attrs_visible(struct kobject *kobj, |
155 | struct attribute *a, int n) | |
156 | { | |
157 | struct device *dev = container_of(kobj, struct device, kobj); | |
158 | struct ltc2990_data *data = dev_get_drvdata(dev); | |
159 | struct device_attribute *da = | |
160 | container_of(a, struct device_attribute, attr); | |
161 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
162 | ||
163 | int attrs_mask = LTC2990_IN0 | LTC2990_TEMP1 | | |
164 | (ltc2990_attrs_ena_0[data->mode[0]] & | |
165 | ltc2990_attrs_ena_1[data->mode[1]]); | |
166 | ||
167 | if (attr->index & attrs_mask) | |
168 | return a->mode; | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
df922703 | 173 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ltc2990_show_value, NULL, |
5d9ca430 TL |
174 | LTC2990_TEMP1); |
175 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, ltc2990_show_value, NULL, | |
176 | LTC2990_TEMP2); | |
177 | static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, ltc2990_show_value, NULL, | |
178 | LTC2990_TEMP3); | |
df922703 | 179 | static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ltc2990_show_value, NULL, |
5d9ca430 | 180 | LTC2990_CURR1); |
df922703 | 181 | static SENSOR_DEVICE_ATTR(curr2_input, S_IRUGO, ltc2990_show_value, NULL, |
5d9ca430 | 182 | LTC2990_CURR2); |
df922703 | 183 | static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, ltc2990_show_value, NULL, |
5d9ca430 TL |
184 | LTC2990_IN0); |
185 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ltc2990_show_value, NULL, | |
186 | LTC2990_IN1); | |
187 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, ltc2990_show_value, NULL, | |
188 | LTC2990_IN2); | |
189 | static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, ltc2990_show_value, NULL, | |
190 | LTC2990_IN3); | |
191 | static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, ltc2990_show_value, NULL, | |
192 | LTC2990_IN4); | |
df922703 ML |
193 | |
194 | static struct attribute *ltc2990_attrs[] = { | |
195 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
5d9ca430 TL |
196 | &sensor_dev_attr_temp2_input.dev_attr.attr, |
197 | &sensor_dev_attr_temp3_input.dev_attr.attr, | |
df922703 ML |
198 | &sensor_dev_attr_curr1_input.dev_attr.attr, |
199 | &sensor_dev_attr_curr2_input.dev_attr.attr, | |
200 | &sensor_dev_attr_in0_input.dev_attr.attr, | |
5d9ca430 TL |
201 | &sensor_dev_attr_in1_input.dev_attr.attr, |
202 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
203 | &sensor_dev_attr_in3_input.dev_attr.attr, | |
204 | &sensor_dev_attr_in4_input.dev_attr.attr, | |
df922703 ML |
205 | NULL, |
206 | }; | |
5d9ca430 TL |
207 | |
208 | static const struct attribute_group ltc2990_group = { | |
209 | .attrs = ltc2990_attrs, | |
210 | .is_visible = ltc2990_attrs_visible, | |
211 | }; | |
212 | __ATTRIBUTE_GROUPS(ltc2990); | |
df922703 ML |
213 | |
214 | static int ltc2990_i2c_probe(struct i2c_client *i2c, | |
215 | const struct i2c_device_id *id) | |
216 | { | |
217 | int ret; | |
218 | struct device *hwmon_dev; | |
5d9ca430 TL |
219 | struct ltc2990_data *data; |
220 | struct device_node *of_node = i2c->dev.of_node; | |
df922703 ML |
221 | |
222 | if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA | | |
223 | I2C_FUNC_SMBUS_WORD_DATA)) | |
224 | return -ENODEV; | |
225 | ||
5d9ca430 TL |
226 | data = devm_kzalloc(&i2c->dev, sizeof(struct ltc2990_data), GFP_KERNEL); |
227 | if (unlikely(!data)) | |
228 | return -ENOMEM; | |
229 | ||
230 | data->i2c = i2c; | |
231 | ||
232 | if (of_node) { | |
233 | ret = of_property_read_u32_array(of_node, "lltc,meas-mode", | |
234 | data->mode, 2); | |
235 | if (ret < 0) | |
236 | return ret; | |
237 | ||
238 | if (data->mode[0] & ~LTC2990_MODE0_MASK || | |
239 | data->mode[1] & ~LTC2990_MODE1_MASK) | |
240 | return -EINVAL; | |
241 | } else { | |
242 | ret = i2c_smbus_read_byte_data(i2c, LTC2990_CONTROL); | |
243 | if (ret < 0) | |
244 | return ret; | |
245 | ||
246 | data->mode[0] = ret >> LTC2990_MODE0_SHIFT & LTC2990_MODE0_MASK; | |
247 | data->mode[1] = ret >> LTC2990_MODE1_SHIFT & LTC2990_MODE1_MASK; | |
248 | } | |
249 | ||
250 | /* Setup continuous mode */ | |
df922703 | 251 | ret = i2c_smbus_write_byte_data(i2c, LTC2990_CONTROL, |
5d9ca430 TL |
252 | data->mode[0] << LTC2990_MODE0_SHIFT | |
253 | data->mode[1] << LTC2990_MODE1_SHIFT); | |
df922703 ML |
254 | if (ret < 0) { |
255 | dev_err(&i2c->dev, "Error: Failed to set control mode.\n"); | |
256 | return ret; | |
257 | } | |
258 | /* Trigger once to start continuous conversion */ | |
259 | ret = i2c_smbus_write_byte_data(i2c, LTC2990_TRIGGER, 1); | |
260 | if (ret < 0) { | |
261 | dev_err(&i2c->dev, "Error: Failed to start acquisition.\n"); | |
262 | return ret; | |
263 | } | |
264 | ||
265 | hwmon_dev = devm_hwmon_device_register_with_groups(&i2c->dev, | |
266 | i2c->name, | |
5d9ca430 | 267 | data, |
df922703 ML |
268 | ltc2990_groups); |
269 | ||
270 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
271 | } | |
272 | ||
273 | static const struct i2c_device_id ltc2990_i2c_id[] = { | |
274 | { "ltc2990", 0 }, | |
275 | {} | |
276 | }; | |
277 | MODULE_DEVICE_TABLE(i2c, ltc2990_i2c_id); | |
278 | ||
279 | static struct i2c_driver ltc2990_i2c_driver = { | |
280 | .driver = { | |
281 | .name = "ltc2990", | |
282 | }, | |
283 | .probe = ltc2990_i2c_probe, | |
284 | .id_table = ltc2990_i2c_id, | |
285 | }; | |
286 | ||
287 | module_i2c_driver(ltc2990_i2c_driver); | |
288 | ||
289 | MODULE_DESCRIPTION("LTC2990 Sensor Driver"); | |
290 | MODULE_AUTHOR("Topic Embedded Products"); | |
291 | MODULE_LICENSE("GPL v2"); |