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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
hwmon: Driver for Linear Technologies LTC2945
LTC2945 is a system monitor that measures current, voltage, and power.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
+616
+84
Documentation/hwmon/ltc2945
+84
Documentation/hwmon/ltc2945
···
1
+
Kernel driver ltc2945
2
+
=====================
3
+
4
+
Supported chips:
5
+
* Linear Technology LTC2945
6
+
Prefix: 'ltc2945'
7
+
Addresses scanned: -
8
+
Datasheet:
9
+
http://cds.linear.com/docs/en/datasheet/2945fa.pdf
10
+
11
+
Author: Guenter Roeck <linux@roeck-us.net>
12
+
13
+
14
+
Description
15
+
-----------
16
+
17
+
The LTC2945 is a rail-to-rail system monitor that measures current, voltage,
18
+
and power consumption.
19
+
20
+
21
+
Usage Notes
22
+
-----------
23
+
24
+
This driver does not probe for LTC2945 devices, since there is no register
25
+
which can be safely used to identify the chip. You will have to instantiate
26
+
the devices explicitly.
27
+
28
+
Example: the following will load the driver for an LTC2945 at address 0x10
29
+
on I2C bus #1:
30
+
$ modprobe ltc2945
31
+
$ echo ltc2945 0x10 > /sys/bus/i2c/devices/i2c-1/new_device
32
+
33
+
34
+
Sysfs entries
35
+
-------------
36
+
37
+
Voltage readings provided by this driver are reported as obtained from the ADC
38
+
registers. If a set of voltage divider resistors is installed, calculate the
39
+
real voltage by multiplying the reported value with (R1+R2)/R2, where R1 is the
40
+
value of the divider resistor against the measured voltage and R2 is the value
41
+
of the divider resistor against Ground.
42
+
43
+
Current reading provided by this driver is reported as obtained from the ADC
44
+
Current Sense register. The reported value assumes that a 1 mOhm sense resistor
45
+
is installed. If a different sense resistor is installed, calculate the real
46
+
current by dividing the reported value by the sense resistor value in mOhm.
47
+
48
+
in1_input VIN voltage (mV). Voltage is measured either at
49
+
SENSE+ or VDD pin depending on chip configuration.
50
+
in1_min Undervoltage threshold
51
+
in1_max Overvoltage threshold
52
+
in1_lowest Lowest measured voltage
53
+
in1_highest Highest measured voltage
54
+
in1_reset_history Write 1 to reset in1 history
55
+
in1_min_alarm Undervoltage alarm
56
+
in1_max_alarm Overvoltage alarm
57
+
58
+
in2_input ADIN voltage (mV)
59
+
in2_min Undervoltage threshold
60
+
in2_max Overvoltage threshold
61
+
in2_lowest Lowest measured voltage
62
+
in2_highest Highest measured voltage
63
+
in2_reset_history Write 1 to reset in2 history
64
+
in2_min_alarm Undervoltage alarm
65
+
in2_max_alarm Overvoltage alarm
66
+
67
+
curr1_input SENSE current (mA)
68
+
curr1_min Undercurrent threshold
69
+
curr1_max Overcurrent threshold
70
+
curr1_lowest Lowest measured current
71
+
curr1_highest Highest measured current
72
+
curr1_reset_history Write 1 to reset curr1 history
73
+
curr1_min_alarm Undercurrent alarm
74
+
curr1_max_alarm Overcurrent alarm
75
+
76
+
power1_input Power (in uW). Power is calculated based on SENSE+/VDD
77
+
voltage or ADIN voltage depending on chip configuration.
78
+
power1_min Low lower threshold
79
+
power1_max High power threshold
80
+
power1_input_lowest Historical minimum power use
81
+
power1_input_highest Historical maximum power use
82
+
power1_reset_history Write 1 to reset power1 history
83
+
power1_min_alarm Low power alarm
84
+
power1_max_alarm High power alarm
+12
drivers/hwmon/Kconfig
+12
drivers/hwmon/Kconfig
···
776
776
This driver can also be built as a module. If so, the module
777
777
will be called lm93.
778
778
779
+
config SENSORS_LTC2945
780
+
tristate "Linear Technology LTC2945"
781
+
depends on I2C
782
+
select REGMAP_I2C
783
+
default n
784
+
help
785
+
If you say yes here you get support for Linear Technology LTC2945
786
+
I2C System Monitor.
787
+
788
+
This driver can also be built as a module. If so, the module will
789
+
be called ltc2945.
790
+
779
791
config SENSORS_LTC4151
780
792
tristate "Linear Technology LTC4151"
781
793
depends on I2C
+1
drivers/hwmon/Makefile
+1
drivers/hwmon/Makefile
···
95
95
obj-$(CONFIG_SENSORS_LM95234) += lm95234.o
96
96
obj-$(CONFIG_SENSORS_LM95241) += lm95241.o
97
97
obj-$(CONFIG_SENSORS_LM95245) += lm95245.o
98
+
obj-$(CONFIG_SENSORS_LTC2945) += ltc2945.o
98
99
obj-$(CONFIG_SENSORS_LTC4151) += ltc4151.o
99
100
obj-$(CONFIG_SENSORS_LTC4215) += ltc4215.o
100
101
obj-$(CONFIG_SENSORS_LTC4222) += ltc4222.o
+519
drivers/hwmon/ltc2945.c
+519
drivers/hwmon/ltc2945.c
···
1
+
/*
2
+
* Driver for Linear Technology LTC2945 I2C Power Monitor
3
+
*
4
+
* Copyright (c) 2014 Guenter Roeck
5
+
*
6
+
* This program is free software; you can redistribute it and/or modify
7
+
* it under the terms of the GNU General Public License as published by
8
+
* the Free Software Foundation; either version 2 of the License, or
9
+
* (at your option) any later version.
10
+
*
11
+
* This program is distributed in the hope that it will be useful,
12
+
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13
+
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14
+
* GNU General Public License for more details.
15
+
*/
16
+
17
+
#include <linux/kernel.h>
18
+
#include <linux/module.h>
19
+
#include <linux/err.h>
20
+
#include <linux/slab.h>
21
+
#include <linux/i2c.h>
22
+
#include <linux/hwmon.h>
23
+
#include <linux/hwmon-sysfs.h>
24
+
#include <linux/jiffies.h>
25
+
#include <linux/regmap.h>
26
+
27
+
/* chip registers */
28
+
#define LTC2945_CONTROL 0x00
29
+
#define LTC2945_ALERT 0x01
30
+
#define LTC2945_STATUS 0x02
31
+
#define LTC2945_FAULT 0x03
32
+
#define LTC2945_POWER_H 0x05
33
+
#define LTC2945_MAX_POWER_H 0x08
34
+
#define LTC2945_MIN_POWER_H 0x0b
35
+
#define LTC2945_MAX_POWER_THRES_H 0x0e
36
+
#define LTC2945_MIN_POWER_THRES_H 0x11
37
+
#define LTC2945_SENSE_H 0x14
38
+
#define LTC2945_MAX_SENSE_H 0x16
39
+
#define LTC2945_MIN_SENSE_H 0x18
40
+
#define LTC2945_MAX_SENSE_THRES_H 0x1a
41
+
#define LTC2945_MIN_SENSE_THRES_H 0x1c
42
+
#define LTC2945_VIN_H 0x1e
43
+
#define LTC2945_MAX_VIN_H 0x20
44
+
#define LTC2945_MIN_VIN_H 0x22
45
+
#define LTC2945_MAX_VIN_THRES_H 0x24
46
+
#define LTC2945_MIN_VIN_THRES_H 0x26
47
+
#define LTC2945_ADIN_H 0x28
48
+
#define LTC2945_MAX_ADIN_H 0x2a
49
+
#define LTC2945_MIN_ADIN_H 0x2c
50
+
#define LTC2945_MAX_ADIN_THRES_H 0x2e
51
+
#define LTC2945_MIN_ADIN_THRES_H 0x30
52
+
#define LTC2945_MIN_ADIN_THRES_L 0x31
53
+
54
+
/* Fault register bits */
55
+
56
+
#define FAULT_ADIN_UV (1 << 0)
57
+
#define FAULT_ADIN_OV (1 << 1)
58
+
#define FAULT_VIN_UV (1 << 2)
59
+
#define FAULT_VIN_OV (1 << 3)
60
+
#define FAULT_SENSE_UV (1 << 4)
61
+
#define FAULT_SENSE_OV (1 << 5)
62
+
#define FAULT_POWER_UV (1 << 6)
63
+
#define FAULT_POWER_OV (1 << 7)
64
+
65
+
/* Control register bits */
66
+
67
+
#define CONTROL_MULT_SELECT (1 << 0)
68
+
#define CONTROL_TEST_MODE (1 << 4)
69
+
70
+
static inline bool is_power_reg(u8 reg)
71
+
{
72
+
return reg < LTC2945_SENSE_H;
73
+
}
74
+
75
+
/* Return the value from the given register in uW, mV, or mA */
76
+
static long long ltc2945_reg_to_val(struct device *dev, u8 reg)
77
+
{
78
+
struct regmap *regmap = dev_get_drvdata(dev);
79
+
unsigned int control;
80
+
u8 buf[3];
81
+
long long val;
82
+
int ret;
83
+
84
+
ret = regmap_bulk_read(regmap, reg, buf,
85
+
is_power_reg(reg) ? 3 : 2);
86
+
if (ret < 0)
87
+
return ret;
88
+
89
+
if (is_power_reg(reg)) {
90
+
/* power */
91
+
val = (buf[0] << 16) + (buf[1] << 8) + buf[2];
92
+
} else {
93
+
/* current, voltage */
94
+
val = (buf[0] << 4) + (buf[1] >> 4);
95
+
}
96
+
97
+
switch (reg) {
98
+
case LTC2945_POWER_H:
99
+
case LTC2945_MAX_POWER_H:
100
+
case LTC2945_MIN_POWER_H:
101
+
case LTC2945_MAX_POWER_THRES_H:
102
+
case LTC2945_MIN_POWER_THRES_H:
103
+
/*
104
+
* Convert to uW by assuming current is measured with
105
+
* an 1mOhm sense resistor, similar to current
106
+
* measurements.
107
+
* Control register bit 0 selects if voltage at SENSE+/VDD
108
+
* or voltage at ADIN is used to measure power.
109
+
*/
110
+
ret = regmap_read(regmap, LTC2945_CONTROL, &control);
111
+
if (ret < 0)
112
+
return ret;
113
+
if (control & CONTROL_MULT_SELECT) {
114
+
/* 25 mV * 25 uV = 0.625 uV resolution. */
115
+
val *= 625LL;
116
+
} else {
117
+
/* 0.5 mV * 25 uV = 0.0125 uV resolution. */
118
+
val = (val * 25LL) >> 1;
119
+
}
120
+
break;
121
+
case LTC2945_VIN_H:
122
+
case LTC2945_MAX_VIN_H:
123
+
case LTC2945_MIN_VIN_H:
124
+
case LTC2945_MAX_VIN_THRES_H:
125
+
case LTC2945_MIN_VIN_THRES_H:
126
+
/* 25 mV resolution. Convert to mV. */
127
+
val *= 25;
128
+
break;
129
+
case LTC2945_ADIN_H:
130
+
case LTC2945_MAX_ADIN_H:
131
+
case LTC2945_MIN_ADIN_THRES_H:
132
+
case LTC2945_MAX_ADIN_THRES_H:
133
+
case LTC2945_MIN_ADIN_H:
134
+
/* 0.5mV resolution. Convert to mV. */
135
+
val = val >> 1;
136
+
break;
137
+
case LTC2945_SENSE_H:
138
+
case LTC2945_MAX_SENSE_H:
139
+
case LTC2945_MIN_SENSE_H:
140
+
case LTC2945_MAX_SENSE_THRES_H:
141
+
case LTC2945_MIN_SENSE_THRES_H:
142
+
/*
143
+
* 25 uV resolution. Convert to current as measured with
144
+
* an 1 mOhm sense resistor, in mA. If a different sense
145
+
* resistor is installed, calculate the actual current by
146
+
* dividing the reported current by the sense resistor value
147
+
* in mOhm.
148
+
*/
149
+
val *= 25;
150
+
break;
151
+
default:
152
+
return -EINVAL;
153
+
}
154
+
return val;
155
+
}
156
+
157
+
static int ltc2945_val_to_reg(struct device *dev, u8 reg,
158
+
unsigned long val)
159
+
{
160
+
struct regmap *regmap = dev_get_drvdata(dev);
161
+
unsigned int control;
162
+
int ret;
163
+
164
+
switch (reg) {
165
+
case LTC2945_POWER_H:
166
+
case LTC2945_MAX_POWER_H:
167
+
case LTC2945_MIN_POWER_H:
168
+
case LTC2945_MAX_POWER_THRES_H:
169
+
case LTC2945_MIN_POWER_THRES_H:
170
+
/*
171
+
* Convert to register value by assuming current is measured
172
+
* with an 1mOhm sense resistor, similar to current
173
+
* measurements.
174
+
* Control register bit 0 selects if voltage at SENSE+/VDD
175
+
* or voltage at ADIN is used to measure power, which in turn
176
+
* determines register calculations.
177
+
*/
178
+
ret = regmap_read(regmap, LTC2945_CONTROL, &control);
179
+
if (ret < 0)
180
+
return ret;
181
+
if (control & CONTROL_MULT_SELECT) {
182
+
/* 25 mV * 25 uV = 0.625 uV resolution. */
183
+
val = DIV_ROUND_CLOSEST(val, 625);
184
+
} else {
185
+
/*
186
+
* 0.5 mV * 25 uV = 0.0125 uV resolution.
187
+
* Divide first to avoid overflow;
188
+
* accept loss of accuracy.
189
+
*/
190
+
val = DIV_ROUND_CLOSEST(val, 25) * 2;
191
+
}
192
+
break;
193
+
case LTC2945_VIN_H:
194
+
case LTC2945_MAX_VIN_H:
195
+
case LTC2945_MIN_VIN_H:
196
+
case LTC2945_MAX_VIN_THRES_H:
197
+
case LTC2945_MIN_VIN_THRES_H:
198
+
/* 25 mV resolution. */
199
+
val /= 25;
200
+
break;
201
+
case LTC2945_ADIN_H:
202
+
case LTC2945_MAX_ADIN_H:
203
+
case LTC2945_MIN_ADIN_THRES_H:
204
+
case LTC2945_MAX_ADIN_THRES_H:
205
+
case LTC2945_MIN_ADIN_H:
206
+
/* 0.5mV resolution. */
207
+
val *= 2;
208
+
break;
209
+
case LTC2945_SENSE_H:
210
+
case LTC2945_MAX_SENSE_H:
211
+
case LTC2945_MIN_SENSE_H:
212
+
case LTC2945_MAX_SENSE_THRES_H:
213
+
case LTC2945_MIN_SENSE_THRES_H:
214
+
/*
215
+
* 25 uV resolution. Convert to current as measured with
216
+
* an 1 mOhm sense resistor, in mA. If a different sense
217
+
* resistor is installed, calculate the actual current by
218
+
* dividing the reported current by the sense resistor value
219
+
* in mOhm.
220
+
*/
221
+
val = DIV_ROUND_CLOSEST(val, 25);
222
+
break;
223
+
default:
224
+
return -EINVAL;
225
+
}
226
+
return val;
227
+
}
228
+
229
+
static ssize_t ltc2945_show_value(struct device *dev,
230
+
struct device_attribute *da, char *buf)
231
+
{
232
+
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
233
+
long long value;
234
+
235
+
value = ltc2945_reg_to_val(dev, attr->index);
236
+
if (value < 0)
237
+
return value;
238
+
return snprintf(buf, PAGE_SIZE, "%lld\n", value);
239
+
}
240
+
241
+
static ssize_t ltc2945_set_value(struct device *dev,
242
+
struct device_attribute *da,
243
+
const char *buf, size_t count)
244
+
{
245
+
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
246
+
struct regmap *regmap = dev_get_drvdata(dev);
247
+
u8 reg = attr->index;
248
+
unsigned long val;
249
+
u8 regbuf[3];
250
+
int num_regs;
251
+
int regval;
252
+
int ret;
253
+
254
+
ret = kstrtoul(buf, 10, &val);
255
+
if (ret)
256
+
return ret;
257
+
258
+
/* convert to register value, then clamp and write result */
259
+
regval = ltc2945_val_to_reg(dev, reg, val);
260
+
if (is_power_reg(reg)) {
261
+
regval = clamp_val(regval, 0, 0xffffff);
262
+
regbuf[0] = regval >> 16;
263
+
regbuf[1] = (regval >> 8) & 0xff;
264
+
regbuf[2] = regval;
265
+
num_regs = 3;
266
+
} else {
267
+
regval = clamp_val(regval, 0, 0xfff) << 4;
268
+
regbuf[0] = regval >> 8;
269
+
regbuf[1] = regval & 0xff;
270
+
num_regs = 2;
271
+
}
272
+
ret = regmap_bulk_write(regmap, reg, regbuf, num_regs);
273
+
return ret < 0 ? ret : count;
274
+
}
275
+
276
+
static ssize_t ltc2945_reset_history(struct device *dev,
277
+
struct device_attribute *da,
278
+
const char *buf, size_t count)
279
+
{
280
+
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
281
+
struct regmap *regmap = dev_get_drvdata(dev);
282
+
u8 reg = attr->index;
283
+
int num_regs = is_power_reg(reg) ? 3 : 2;
284
+
u8 buf_min[3] = { 0xff, 0xff, 0xff };
285
+
u8 buf_max[3] = { 0, 0, 0 };
286
+
unsigned long val;
287
+
int ret;
288
+
289
+
ret = kstrtoul(buf, 10, &val);
290
+
if (ret)
291
+
return ret;
292
+
if (val != 1)
293
+
return -EINVAL;
294
+
295
+
ret = regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE,
296
+
CONTROL_TEST_MODE);
297
+
298
+
/* Reset minimum */
299
+
ret = regmap_bulk_write(regmap, reg, buf_min, num_regs);
300
+
if (ret)
301
+
return ret;
302
+
303
+
switch (reg) {
304
+
case LTC2945_MIN_POWER_H:
305
+
reg = LTC2945_MAX_POWER_H;
306
+
break;
307
+
case LTC2945_MIN_SENSE_H:
308
+
reg = LTC2945_MAX_SENSE_H;
309
+
break;
310
+
case LTC2945_MIN_VIN_H:
311
+
reg = LTC2945_MAX_VIN_H;
312
+
break;
313
+
case LTC2945_MIN_ADIN_H:
314
+
reg = LTC2945_MAX_ADIN_H;
315
+
break;
316
+
default:
317
+
BUG();
318
+
break;
319
+
}
320
+
/* Reset maximum */
321
+
ret = regmap_bulk_write(regmap, reg, buf_max, num_regs);
322
+
323
+
/* Try resetting test mode even if there was an error */
324
+
regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE, 0);
325
+
326
+
return ret ? : count;
327
+
}
328
+
329
+
static ssize_t ltc2945_show_bool(struct device *dev,
330
+
struct device_attribute *da, char *buf)
331
+
{
332
+
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
333
+
struct regmap *regmap = dev_get_drvdata(dev);
334
+
unsigned int fault;
335
+
int ret;
336
+
337
+
ret = regmap_read(regmap, LTC2945_FAULT, &fault);
338
+
if (ret < 0)
339
+
return ret;
340
+
341
+
fault &= attr->index;
342
+
if (fault) /* Clear reported faults in chip register */
343
+
regmap_update_bits(regmap, LTC2945_FAULT, attr->index, 0);
344
+
345
+
return snprintf(buf, PAGE_SIZE, "%d\n", !!fault);
346
+
}
347
+
348
+
/* Input voltages */
349
+
350
+
static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ltc2945_show_value, NULL,
351
+
LTC2945_VIN_H);
352
+
static SENSOR_DEVICE_ATTR(in1_min, S_IRUGO | S_IWUSR, ltc2945_show_value,
353
+
ltc2945_set_value, LTC2945_MIN_VIN_THRES_H);
354
+
static SENSOR_DEVICE_ATTR(in1_max, S_IRUGO | S_IWUSR, ltc2945_show_value,
355
+
ltc2945_set_value, LTC2945_MAX_VIN_THRES_H);
356
+
static SENSOR_DEVICE_ATTR(in1_lowest, S_IRUGO, ltc2945_show_value, NULL,
357
+
LTC2945_MIN_VIN_H);
358
+
static SENSOR_DEVICE_ATTR(in1_highest, S_IRUGO, ltc2945_show_value, NULL,
359
+
LTC2945_MAX_VIN_H);
360
+
static SENSOR_DEVICE_ATTR(in1_reset_history, S_IWUSR, NULL,
361
+
ltc2945_reset_history, LTC2945_MIN_VIN_H);
362
+
363
+
static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, ltc2945_show_value, NULL,
364
+
LTC2945_ADIN_H);
365
+
static SENSOR_DEVICE_ATTR(in2_min, S_IRUGO | S_IWUSR, ltc2945_show_value,
366
+
ltc2945_set_value, LTC2945_MIN_ADIN_THRES_H);
367
+
static SENSOR_DEVICE_ATTR(in2_max, S_IRUGO | S_IWUSR, ltc2945_show_value,
368
+
ltc2945_set_value, LTC2945_MAX_ADIN_THRES_H);
369
+
static SENSOR_DEVICE_ATTR(in2_lowest, S_IRUGO, ltc2945_show_value, NULL,
370
+
LTC2945_MIN_ADIN_H);
371
+
static SENSOR_DEVICE_ATTR(in2_highest, S_IRUGO, ltc2945_show_value, NULL,
372
+
LTC2945_MAX_ADIN_H);
373
+
static SENSOR_DEVICE_ATTR(in2_reset_history, S_IWUSR, NULL,
374
+
ltc2945_reset_history, LTC2945_MIN_ADIN_H);
375
+
376
+
/* Voltage alarms */
377
+
378
+
static SENSOR_DEVICE_ATTR(in1_min_alarm, S_IRUGO, ltc2945_show_bool, NULL,
379
+
FAULT_VIN_UV);
380
+
static SENSOR_DEVICE_ATTR(in1_max_alarm, S_IRUGO, ltc2945_show_bool, NULL,
381
+
FAULT_VIN_OV);
382
+
static SENSOR_DEVICE_ATTR(in2_min_alarm, S_IRUGO, ltc2945_show_bool, NULL,
383
+
FAULT_ADIN_UV);
384
+
static SENSOR_DEVICE_ATTR(in2_max_alarm, S_IRUGO, ltc2945_show_bool, NULL,
385
+
FAULT_ADIN_OV);
386
+
387
+
/* Currents (via sense resistor) */
388
+
389
+
static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ltc2945_show_value, NULL,
390
+
LTC2945_SENSE_H);
391
+
static SENSOR_DEVICE_ATTR(curr1_min, S_IRUGO | S_IWUSR, ltc2945_show_value,
392
+
ltc2945_set_value, LTC2945_MIN_SENSE_THRES_H);
393
+
static SENSOR_DEVICE_ATTR(curr1_max, S_IRUGO | S_IWUSR, ltc2945_show_value,
394
+
ltc2945_set_value, LTC2945_MAX_SENSE_THRES_H);
395
+
static SENSOR_DEVICE_ATTR(curr1_lowest, S_IRUGO, ltc2945_show_value, NULL,
396
+
LTC2945_MIN_SENSE_H);
397
+
static SENSOR_DEVICE_ATTR(curr1_highest, S_IRUGO, ltc2945_show_value, NULL,
398
+
LTC2945_MAX_SENSE_H);
399
+
static SENSOR_DEVICE_ATTR(curr1_reset_history, S_IWUSR, NULL,
400
+
ltc2945_reset_history, LTC2945_MIN_SENSE_H);
401
+
402
+
/* Current alarms */
403
+
404
+
static SENSOR_DEVICE_ATTR(curr1_min_alarm, S_IRUGO, ltc2945_show_bool, NULL,
405
+
FAULT_SENSE_UV);
406
+
static SENSOR_DEVICE_ATTR(curr1_max_alarm, S_IRUGO, ltc2945_show_bool, NULL,
407
+
FAULT_SENSE_OV);
408
+
409
+
/* Power */
410
+
411
+
static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ltc2945_show_value, NULL,
412
+
LTC2945_POWER_H);
413
+
static SENSOR_DEVICE_ATTR(power1_min, S_IRUGO | S_IWUSR, ltc2945_show_value,
414
+
ltc2945_set_value, LTC2945_MIN_POWER_THRES_H);
415
+
static SENSOR_DEVICE_ATTR(power1_max, S_IRUGO | S_IWUSR, ltc2945_show_value,
416
+
ltc2945_set_value, LTC2945_MAX_POWER_THRES_H);
417
+
static SENSOR_DEVICE_ATTR(power1_input_lowest, S_IRUGO, ltc2945_show_value,
418
+
NULL, LTC2945_MIN_POWER_H);
419
+
static SENSOR_DEVICE_ATTR(power1_input_highest, S_IRUGO, ltc2945_show_value,
420
+
NULL, LTC2945_MAX_POWER_H);
421
+
static SENSOR_DEVICE_ATTR(power1_reset_history, S_IWUSR, NULL,
422
+
ltc2945_reset_history, LTC2945_MIN_POWER_H);
423
+
424
+
/* Power alarms */
425
+
426
+
static SENSOR_DEVICE_ATTR(power1_min_alarm, S_IRUGO, ltc2945_show_bool, NULL,
427
+
FAULT_POWER_UV);
428
+
static SENSOR_DEVICE_ATTR(power1_max_alarm, S_IRUGO, ltc2945_show_bool, NULL,
429
+
FAULT_POWER_OV);
430
+
431
+
static struct attribute *ltc2945_attrs[] = {
432
+
&sensor_dev_attr_in1_input.dev_attr.attr,
433
+
&sensor_dev_attr_in1_min.dev_attr.attr,
434
+
&sensor_dev_attr_in1_max.dev_attr.attr,
435
+
&sensor_dev_attr_in1_lowest.dev_attr.attr,
436
+
&sensor_dev_attr_in1_highest.dev_attr.attr,
437
+
&sensor_dev_attr_in1_reset_history.dev_attr.attr,
438
+
&sensor_dev_attr_in1_min_alarm.dev_attr.attr,
439
+
&sensor_dev_attr_in1_max_alarm.dev_attr.attr,
440
+
441
+
&sensor_dev_attr_in2_input.dev_attr.attr,
442
+
&sensor_dev_attr_in2_min.dev_attr.attr,
443
+
&sensor_dev_attr_in2_max.dev_attr.attr,
444
+
&sensor_dev_attr_in2_lowest.dev_attr.attr,
445
+
&sensor_dev_attr_in2_highest.dev_attr.attr,
446
+
&sensor_dev_attr_in2_reset_history.dev_attr.attr,
447
+
&sensor_dev_attr_in2_min_alarm.dev_attr.attr,
448
+
&sensor_dev_attr_in2_max_alarm.dev_attr.attr,
449
+
450
+
&sensor_dev_attr_curr1_input.dev_attr.attr,
451
+
&sensor_dev_attr_curr1_min.dev_attr.attr,
452
+
&sensor_dev_attr_curr1_max.dev_attr.attr,
453
+
&sensor_dev_attr_curr1_lowest.dev_attr.attr,
454
+
&sensor_dev_attr_curr1_highest.dev_attr.attr,
455
+
&sensor_dev_attr_curr1_reset_history.dev_attr.attr,
456
+
&sensor_dev_attr_curr1_min_alarm.dev_attr.attr,
457
+
&sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
458
+
459
+
&sensor_dev_attr_power1_input.dev_attr.attr,
460
+
&sensor_dev_attr_power1_min.dev_attr.attr,
461
+
&sensor_dev_attr_power1_max.dev_attr.attr,
462
+
&sensor_dev_attr_power1_input_lowest.dev_attr.attr,
463
+
&sensor_dev_attr_power1_input_highest.dev_attr.attr,
464
+
&sensor_dev_attr_power1_reset_history.dev_attr.attr,
465
+
&sensor_dev_attr_power1_min_alarm.dev_attr.attr,
466
+
&sensor_dev_attr_power1_max_alarm.dev_attr.attr,
467
+
468
+
NULL,
469
+
};
470
+
ATTRIBUTE_GROUPS(ltc2945);
471
+
472
+
static struct regmap_config ltc2945_regmap_config = {
473
+
.reg_bits = 8,
474
+
.val_bits = 8,
475
+
.max_register = LTC2945_MIN_ADIN_THRES_L,
476
+
};
477
+
478
+
static int ltc2945_probe(struct i2c_client *client,
479
+
const struct i2c_device_id *id)
480
+
{
481
+
struct device *dev = &client->dev;
482
+
struct device *hwmon_dev;
483
+
struct regmap *regmap;
484
+
485
+
regmap = devm_regmap_init_i2c(client, <c2945_regmap_config);
486
+
if (IS_ERR(regmap)) {
487
+
dev_err(dev, "failed to allocate register map\n");
488
+
return PTR_ERR(regmap);
489
+
}
490
+
491
+
/* Clear faults */
492
+
regmap_write(regmap, LTC2945_FAULT, 0x00);
493
+
494
+
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
495
+
regmap,
496
+
ltc2945_groups);
497
+
return PTR_ERR_OR_ZERO(hwmon_dev);
498
+
}
499
+
500
+
static const struct i2c_device_id ltc2945_id[] = {
501
+
{"ltc2945", 0},
502
+
{ }
503
+
};
504
+
505
+
MODULE_DEVICE_TABLE(i2c, ltc2945_id);
506
+
507
+
static struct i2c_driver ltc2945_driver = {
508
+
.driver = {
509
+
.name = "ltc2945",
510
+
},
511
+
.probe = ltc2945_probe,
512
+
.id_table = ltc2945_id,
513
+
};
514
+
515
+
module_i2c_driver(ltc2945_driver);
516
+
517
+
MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
518
+
MODULE_DESCRIPTION("LTC2945 driver");
519
+
MODULE_LICENSE("GPL");