1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Driver for |
4 | * Maxim MAX16065/MAX16066 12-Channel/8-Channel, Flash-Configurable |
5 | * System Managers with Nonvolatile Fault Registers |
6 | * Maxim MAX16067/MAX16068 6-Channel, Flash-Configurable System Managers |
7 | * with Nonvolatile Fault Registers |
8 | * Maxim MAX16070/MAX16071 12-Channel/8-Channel, Flash-Configurable System |
9 | * Monitors with Nonvolatile Fault Registers |
10 | * |
11 | * Copyright (C) 2011 Ericsson AB. |
12 | */ |
13 | |
14 | #include <linux/kernel.h> |
15 | #include <linux/module.h> |
16 | #include <linux/init.h> |
17 | #include <linux/err.h> |
18 | #include <linux/slab.h> |
19 | #include <linux/i2c.h> |
20 | #include <linux/hwmon.h> |
21 | #include <linux/hwmon-sysfs.h> |
22 | #include <linux/jiffies.h> |
23 | |
24 | enum chips { max16065, max16066, max16067, max16068, max16070, max16071 }; |
25 | |
26 | /* |
27 | * Registers |
28 | */ |
29 | #define MAX16065_ADC(x) ((x) * 2) |
30 | |
31 | #define MAX16065_CURR_SENSE 0x18 |
32 | #define MAX16065_CSP_ADC 0x19 |
33 | #define MAX16065_FAULT(x) (0x1b + (x)) |
34 | #define MAX16065_SCALE(x) (0x43 + (x)) |
35 | #define MAX16065_CURR_CONTROL 0x47 |
36 | #define MAX16065_LIMIT(l, x) (0x48 + (l) + (x) * 3) /* |
37 | * l: limit |
38 | * 0: min/max |
39 | * 1: crit |
40 | * 2: lcrit |
41 | * x: ADC index |
42 | */ |
43 | |
44 | #define MAX16065_SW_ENABLE 0x73 |
45 | |
46 | #define MAX16065_WARNING_OV (1 << 3) /* Set if secondary threshold is OV |
47 | warning */ |
48 | |
49 | #define MAX16065_CURR_ENABLE (1 << 0) |
50 | |
51 | #define MAX16065_NUM_LIMIT 3 |
52 | #define MAX16065_NUM_ADC 12 /* maximum number of ADC channels */ |
53 | |
54 | static const int max16065_num_adc[] = { |
55 | [max16065] = 12, |
56 | [max16066] = 8, |
57 | [max16067] = 6, |
58 | [max16068] = 6, |
59 | [max16070] = 12, |
60 | [max16071] = 8, |
61 | }; |
62 | |
63 | static const bool max16065_have_secondary[] = { |
64 | [max16065] = true, |
65 | [max16066] = true, |
66 | [max16067] = false, |
67 | [max16068] = false, |
68 | [max16070] = true, |
69 | [max16071] = true, |
70 | }; |
71 | |
72 | static const bool max16065_have_current[] = { |
73 | [max16065] = true, |
74 | [max16066] = true, |
75 | [max16067] = false, |
76 | [max16068] = false, |
77 | [max16070] = true, |
78 | [max16071] = true, |
79 | }; |
80 | |
81 | struct max16065_data { |
82 | enum chips type; |
83 | struct i2c_client *client; |
84 | const struct attribute_group *groups[4]; |
85 | struct mutex update_lock; |
86 | bool valid; |
87 | unsigned long last_updated; /* in jiffies */ |
88 | int num_adc; |
89 | bool have_current; |
90 | int curr_gain; |
91 | /* limits are in mV */ |
92 | int limit[MAX16065_NUM_LIMIT][MAX16065_NUM_ADC]; |
93 | int range[MAX16065_NUM_ADC + 1];/* voltage range */ |
94 | int adc[MAX16065_NUM_ADC + 1]; /* adc values (raw) including csp_adc */ |
95 | int curr_sense; |
96 | int fault[2]; |
97 | }; |
98 | |
99 | static const int max16065_adc_range[] = { 5560, 2780, 1390, 0 }; |
100 | static const int max16065_csp_adc_range[] = { 7000, 14000 }; |
101 | |
102 | /* ADC registers have 10 bit resolution. */ |
103 | static inline int ADC_TO_MV(int adc, int range) |
104 | { |
105 | return (adc * range) / 1024; |
106 | } |
107 | |
108 | /* |
109 | * Limit registers have 8 bit resolution and match upper 8 bits of ADC |
110 | * registers. |
111 | */ |
112 | static inline int LIMIT_TO_MV(int limit, int range) |
113 | { |
114 | return limit * range / 256; |
115 | } |
116 | |
117 | static inline int MV_TO_LIMIT(int mv, int range) |
118 | { |
119 | return clamp_val(DIV_ROUND_CLOSEST(mv * 256, range), 0, 255); |
120 | } |
121 | |
122 | static inline int ADC_TO_CURR(int adc, int gain) |
123 | { |
124 | return adc * 1400000 / (gain * 255); |
125 | } |
126 | |
127 | /* |
128 | * max16065_read_adc() |
129 | * |
130 | * Read 16 bit value from <reg>, <reg+1>. |
131 | * Upper 8 bits are in <reg>, lower 2 bits are in bits 7:6 of <reg+1>. |
132 | */ |
133 | static int max16065_read_adc(struct i2c_client *client, int reg) |
134 | { |
135 | int rv; |
136 | |
137 | rv = i2c_smbus_read_word_swapped(client, command: reg); |
138 | if (unlikely(rv < 0)) |
139 | return rv; |
140 | return rv >> 6; |
141 | } |
142 | |
143 | static struct max16065_data *max16065_update_device(struct device *dev) |
144 | { |
145 | struct max16065_data *data = dev_get_drvdata(dev); |
146 | struct i2c_client *client = data->client; |
147 | |
148 | mutex_lock(&data->update_lock); |
149 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { |
150 | int i; |
151 | |
152 | for (i = 0; i < data->num_adc; i++) |
153 | data->adc[i] |
154 | = max16065_read_adc(client, MAX16065_ADC(i)); |
155 | |
156 | if (data->have_current) { |
157 | data->adc[MAX16065_NUM_ADC] |
158 | = max16065_read_adc(client, MAX16065_CSP_ADC); |
159 | data->curr_sense |
160 | = i2c_smbus_read_byte_data(client, |
161 | MAX16065_CURR_SENSE); |
162 | } |
163 | |
164 | for (i = 0; i < DIV_ROUND_UP(data->num_adc, 8); i++) |
165 | data->fault[i] |
166 | = i2c_smbus_read_byte_data(client, MAX16065_FAULT(i)); |
167 | |
168 | data->last_updated = jiffies; |
169 | data->valid = true; |
170 | } |
171 | mutex_unlock(lock: &data->update_lock); |
172 | return data; |
173 | } |
174 | |
175 | static ssize_t max16065_alarm_show(struct device *dev, |
176 | struct device_attribute *da, char *buf) |
177 | { |
178 | struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da); |
179 | struct max16065_data *data = max16065_update_device(dev); |
180 | int val = data->fault[attr2->nr]; |
181 | |
182 | if (val < 0) |
183 | return val; |
184 | |
185 | val &= (1 << attr2->index); |
186 | if (val) |
187 | i2c_smbus_write_byte_data(client: data->client, |
188 | MAX16065_FAULT(attr2->nr), value: val); |
189 | |
190 | return sysfs_emit(buf, fmt: "%d\n" , !!val); |
191 | } |
192 | |
193 | static ssize_t max16065_input_show(struct device *dev, |
194 | struct device_attribute *da, char *buf) |
195 | { |
196 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
197 | struct max16065_data *data = max16065_update_device(dev); |
198 | int adc = data->adc[attr->index]; |
199 | |
200 | if (unlikely(adc < 0)) |
201 | return adc; |
202 | |
203 | return sysfs_emit(buf, fmt: "%d\n" , |
204 | ADC_TO_MV(adc, range: data->range[attr->index])); |
205 | } |
206 | |
207 | static ssize_t max16065_current_show(struct device *dev, |
208 | struct device_attribute *da, char *buf) |
209 | { |
210 | struct max16065_data *data = max16065_update_device(dev); |
211 | |
212 | if (unlikely(data->curr_sense < 0)) |
213 | return data->curr_sense; |
214 | |
215 | return sysfs_emit(buf, fmt: "%d\n" , |
216 | ADC_TO_CURR(adc: data->curr_sense, gain: data->curr_gain)); |
217 | } |
218 | |
219 | static ssize_t max16065_limit_store(struct device *dev, |
220 | struct device_attribute *da, |
221 | const char *buf, size_t count) |
222 | { |
223 | struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da); |
224 | struct max16065_data *data = dev_get_drvdata(dev); |
225 | unsigned long val; |
226 | int err; |
227 | int limit; |
228 | |
229 | err = kstrtoul(s: buf, base: 10, res: &val); |
230 | if (unlikely(err < 0)) |
231 | return err; |
232 | |
233 | limit = MV_TO_LIMIT(mv: val, range: data->range[attr2->index]); |
234 | |
235 | mutex_lock(&data->update_lock); |
236 | data->limit[attr2->nr][attr2->index] |
237 | = LIMIT_TO_MV(limit, range: data->range[attr2->index]); |
238 | i2c_smbus_write_byte_data(client: data->client, |
239 | MAX16065_LIMIT(attr2->nr, attr2->index), |
240 | value: limit); |
241 | mutex_unlock(lock: &data->update_lock); |
242 | |
243 | return count; |
244 | } |
245 | |
246 | static ssize_t max16065_limit_show(struct device *dev, |
247 | struct device_attribute *da, char *buf) |
248 | { |
249 | struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da); |
250 | struct max16065_data *data = dev_get_drvdata(dev); |
251 | |
252 | return sysfs_emit(buf, fmt: "%d\n" , |
253 | data->limit[attr2->nr][attr2->index]); |
254 | } |
255 | |
256 | /* Construct a sensor_device_attribute structure for each register */ |
257 | |
258 | /* Input voltages */ |
259 | static SENSOR_DEVICE_ATTR_RO(in0_input, max16065_input, 0); |
260 | static SENSOR_DEVICE_ATTR_RO(in1_input, max16065_input, 1); |
261 | static SENSOR_DEVICE_ATTR_RO(in2_input, max16065_input, 2); |
262 | static SENSOR_DEVICE_ATTR_RO(in3_input, max16065_input, 3); |
263 | static SENSOR_DEVICE_ATTR_RO(in4_input, max16065_input, 4); |
264 | static SENSOR_DEVICE_ATTR_RO(in5_input, max16065_input, 5); |
265 | static SENSOR_DEVICE_ATTR_RO(in6_input, max16065_input, 6); |
266 | static SENSOR_DEVICE_ATTR_RO(in7_input, max16065_input, 7); |
267 | static SENSOR_DEVICE_ATTR_RO(in8_input, max16065_input, 8); |
268 | static SENSOR_DEVICE_ATTR_RO(in9_input, max16065_input, 9); |
269 | static SENSOR_DEVICE_ATTR_RO(in10_input, max16065_input, 10); |
270 | static SENSOR_DEVICE_ATTR_RO(in11_input, max16065_input, 11); |
271 | static SENSOR_DEVICE_ATTR_RO(in12_input, max16065_input, 12); |
272 | |
273 | /* Input voltages lcrit */ |
274 | static SENSOR_DEVICE_ATTR_2_RW(in0_lcrit, max16065_limit, 2, 0); |
275 | static SENSOR_DEVICE_ATTR_2_RW(in1_lcrit, max16065_limit, 2, 1); |
276 | static SENSOR_DEVICE_ATTR_2_RW(in2_lcrit, max16065_limit, 2, 2); |
277 | static SENSOR_DEVICE_ATTR_2_RW(in3_lcrit, max16065_limit, 2, 3); |
278 | static SENSOR_DEVICE_ATTR_2_RW(in4_lcrit, max16065_limit, 2, 4); |
279 | static SENSOR_DEVICE_ATTR_2_RW(in5_lcrit, max16065_limit, 2, 5); |
280 | static SENSOR_DEVICE_ATTR_2_RW(in6_lcrit, max16065_limit, 2, 6); |
281 | static SENSOR_DEVICE_ATTR_2_RW(in7_lcrit, max16065_limit, 2, 7); |
282 | static SENSOR_DEVICE_ATTR_2_RW(in8_lcrit, max16065_limit, 2, 8); |
283 | static SENSOR_DEVICE_ATTR_2_RW(in9_lcrit, max16065_limit, 2, 9); |
284 | static SENSOR_DEVICE_ATTR_2_RW(in10_lcrit, max16065_limit, 2, 10); |
285 | static SENSOR_DEVICE_ATTR_2_RW(in11_lcrit, max16065_limit, 2, 11); |
286 | |
287 | /* Input voltages crit */ |
288 | static SENSOR_DEVICE_ATTR_2_RW(in0_crit, max16065_limit, 1, 0); |
289 | static SENSOR_DEVICE_ATTR_2_RW(in1_crit, max16065_limit, 1, 1); |
290 | static SENSOR_DEVICE_ATTR_2_RW(in2_crit, max16065_limit, 1, 2); |
291 | static SENSOR_DEVICE_ATTR_2_RW(in3_crit, max16065_limit, 1, 3); |
292 | static SENSOR_DEVICE_ATTR_2_RW(in4_crit, max16065_limit, 1, 4); |
293 | static SENSOR_DEVICE_ATTR_2_RW(in5_crit, max16065_limit, 1, 5); |
294 | static SENSOR_DEVICE_ATTR_2_RW(in6_crit, max16065_limit, 1, 6); |
295 | static SENSOR_DEVICE_ATTR_2_RW(in7_crit, max16065_limit, 1, 7); |
296 | static SENSOR_DEVICE_ATTR_2_RW(in8_crit, max16065_limit, 1, 8); |
297 | static SENSOR_DEVICE_ATTR_2_RW(in9_crit, max16065_limit, 1, 9); |
298 | static SENSOR_DEVICE_ATTR_2_RW(in10_crit, max16065_limit, 1, 10); |
299 | static SENSOR_DEVICE_ATTR_2_RW(in11_crit, max16065_limit, 1, 11); |
300 | |
301 | /* Input voltages min */ |
302 | static SENSOR_DEVICE_ATTR_2_RW(in0_min, max16065_limit, 0, 0); |
303 | static SENSOR_DEVICE_ATTR_2_RW(in1_min, max16065_limit, 0, 1); |
304 | static SENSOR_DEVICE_ATTR_2_RW(in2_min, max16065_limit, 0, 2); |
305 | static SENSOR_DEVICE_ATTR_2_RW(in3_min, max16065_limit, 0, 3); |
306 | static SENSOR_DEVICE_ATTR_2_RW(in4_min, max16065_limit, 0, 4); |
307 | static SENSOR_DEVICE_ATTR_2_RW(in5_min, max16065_limit, 0, 5); |
308 | static SENSOR_DEVICE_ATTR_2_RW(in6_min, max16065_limit, 0, 6); |
309 | static SENSOR_DEVICE_ATTR_2_RW(in7_min, max16065_limit, 0, 7); |
310 | static SENSOR_DEVICE_ATTR_2_RW(in8_min, max16065_limit, 0, 8); |
311 | static SENSOR_DEVICE_ATTR_2_RW(in9_min, max16065_limit, 0, 9); |
312 | static SENSOR_DEVICE_ATTR_2_RW(in10_min, max16065_limit, 0, 10); |
313 | static SENSOR_DEVICE_ATTR_2_RW(in11_min, max16065_limit, 0, 11); |
314 | |
315 | /* Input voltages max */ |
316 | static SENSOR_DEVICE_ATTR_2_RW(in0_max, max16065_limit, 0, 0); |
317 | static SENSOR_DEVICE_ATTR_2_RW(in1_max, max16065_limit, 0, 1); |
318 | static SENSOR_DEVICE_ATTR_2_RW(in2_max, max16065_limit, 0, 2); |
319 | static SENSOR_DEVICE_ATTR_2_RW(in3_max, max16065_limit, 0, 3); |
320 | static SENSOR_DEVICE_ATTR_2_RW(in4_max, max16065_limit, 0, 4); |
321 | static SENSOR_DEVICE_ATTR_2_RW(in5_max, max16065_limit, 0, 5); |
322 | static SENSOR_DEVICE_ATTR_2_RW(in6_max, max16065_limit, 0, 6); |
323 | static SENSOR_DEVICE_ATTR_2_RW(in7_max, max16065_limit, 0, 7); |
324 | static SENSOR_DEVICE_ATTR_2_RW(in8_max, max16065_limit, 0, 8); |
325 | static SENSOR_DEVICE_ATTR_2_RW(in9_max, max16065_limit, 0, 9); |
326 | static SENSOR_DEVICE_ATTR_2_RW(in10_max, max16065_limit, 0, 10); |
327 | static SENSOR_DEVICE_ATTR_2_RW(in11_max, max16065_limit, 0, 11); |
328 | |
329 | /* alarms */ |
330 | static SENSOR_DEVICE_ATTR_2_RO(in0_alarm, max16065_alarm, 0, 0); |
331 | static SENSOR_DEVICE_ATTR_2_RO(in1_alarm, max16065_alarm, 0, 1); |
332 | static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, max16065_alarm, 0, 2); |
333 | static SENSOR_DEVICE_ATTR_2_RO(in3_alarm, max16065_alarm, 0, 3); |
334 | static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, max16065_alarm, 0, 4); |
335 | static SENSOR_DEVICE_ATTR_2_RO(in5_alarm, max16065_alarm, 0, 5); |
336 | static SENSOR_DEVICE_ATTR_2_RO(in6_alarm, max16065_alarm, 0, 6); |
337 | static SENSOR_DEVICE_ATTR_2_RO(in7_alarm, max16065_alarm, 0, 7); |
338 | static SENSOR_DEVICE_ATTR_2_RO(in8_alarm, max16065_alarm, 1, 0); |
339 | static SENSOR_DEVICE_ATTR_2_RO(in9_alarm, max16065_alarm, 1, 1); |
340 | static SENSOR_DEVICE_ATTR_2_RO(in10_alarm, max16065_alarm, 1, 2); |
341 | static SENSOR_DEVICE_ATTR_2_RO(in11_alarm, max16065_alarm, 1, 3); |
342 | |
343 | /* Current and alarm */ |
344 | static SENSOR_DEVICE_ATTR_RO(curr1_input, max16065_current, 0); |
345 | static SENSOR_DEVICE_ATTR_2_RO(curr1_alarm, max16065_alarm, 1, 4); |
346 | |
347 | /* |
348 | * Finally, construct an array of pointers to members of the above objects, |
349 | * as required for sysfs_create_group() |
350 | */ |
351 | static struct attribute *max16065_basic_attributes[] = { |
352 | &sensor_dev_attr_in0_input.dev_attr.attr, |
353 | &sensor_dev_attr_in0_lcrit.dev_attr.attr, |
354 | &sensor_dev_attr_in0_crit.dev_attr.attr, |
355 | &sensor_dev_attr_in0_alarm.dev_attr.attr, |
356 | |
357 | &sensor_dev_attr_in1_input.dev_attr.attr, |
358 | &sensor_dev_attr_in1_lcrit.dev_attr.attr, |
359 | &sensor_dev_attr_in1_crit.dev_attr.attr, |
360 | &sensor_dev_attr_in1_alarm.dev_attr.attr, |
361 | |
362 | &sensor_dev_attr_in2_input.dev_attr.attr, |
363 | &sensor_dev_attr_in2_lcrit.dev_attr.attr, |
364 | &sensor_dev_attr_in2_crit.dev_attr.attr, |
365 | &sensor_dev_attr_in2_alarm.dev_attr.attr, |
366 | |
367 | &sensor_dev_attr_in3_input.dev_attr.attr, |
368 | &sensor_dev_attr_in3_lcrit.dev_attr.attr, |
369 | &sensor_dev_attr_in3_crit.dev_attr.attr, |
370 | &sensor_dev_attr_in3_alarm.dev_attr.attr, |
371 | |
372 | &sensor_dev_attr_in4_input.dev_attr.attr, |
373 | &sensor_dev_attr_in4_lcrit.dev_attr.attr, |
374 | &sensor_dev_attr_in4_crit.dev_attr.attr, |
375 | &sensor_dev_attr_in4_alarm.dev_attr.attr, |
376 | |
377 | &sensor_dev_attr_in5_input.dev_attr.attr, |
378 | &sensor_dev_attr_in5_lcrit.dev_attr.attr, |
379 | &sensor_dev_attr_in5_crit.dev_attr.attr, |
380 | &sensor_dev_attr_in5_alarm.dev_attr.attr, |
381 | |
382 | &sensor_dev_attr_in6_input.dev_attr.attr, |
383 | &sensor_dev_attr_in6_lcrit.dev_attr.attr, |
384 | &sensor_dev_attr_in6_crit.dev_attr.attr, |
385 | &sensor_dev_attr_in6_alarm.dev_attr.attr, |
386 | |
387 | &sensor_dev_attr_in7_input.dev_attr.attr, |
388 | &sensor_dev_attr_in7_lcrit.dev_attr.attr, |
389 | &sensor_dev_attr_in7_crit.dev_attr.attr, |
390 | &sensor_dev_attr_in7_alarm.dev_attr.attr, |
391 | |
392 | &sensor_dev_attr_in8_input.dev_attr.attr, |
393 | &sensor_dev_attr_in8_lcrit.dev_attr.attr, |
394 | &sensor_dev_attr_in8_crit.dev_attr.attr, |
395 | &sensor_dev_attr_in8_alarm.dev_attr.attr, |
396 | |
397 | &sensor_dev_attr_in9_input.dev_attr.attr, |
398 | &sensor_dev_attr_in9_lcrit.dev_attr.attr, |
399 | &sensor_dev_attr_in9_crit.dev_attr.attr, |
400 | &sensor_dev_attr_in9_alarm.dev_attr.attr, |
401 | |
402 | &sensor_dev_attr_in10_input.dev_attr.attr, |
403 | &sensor_dev_attr_in10_lcrit.dev_attr.attr, |
404 | &sensor_dev_attr_in10_crit.dev_attr.attr, |
405 | &sensor_dev_attr_in10_alarm.dev_attr.attr, |
406 | |
407 | &sensor_dev_attr_in11_input.dev_attr.attr, |
408 | &sensor_dev_attr_in11_lcrit.dev_attr.attr, |
409 | &sensor_dev_attr_in11_crit.dev_attr.attr, |
410 | &sensor_dev_attr_in11_alarm.dev_attr.attr, |
411 | |
412 | NULL |
413 | }; |
414 | |
415 | static struct attribute *max16065_current_attributes[] = { |
416 | &sensor_dev_attr_in12_input.dev_attr.attr, |
417 | &sensor_dev_attr_curr1_input.dev_attr.attr, |
418 | &sensor_dev_attr_curr1_alarm.dev_attr.attr, |
419 | NULL |
420 | }; |
421 | |
422 | static struct attribute *max16065_min_attributes[] = { |
423 | &sensor_dev_attr_in0_min.dev_attr.attr, |
424 | &sensor_dev_attr_in1_min.dev_attr.attr, |
425 | &sensor_dev_attr_in2_min.dev_attr.attr, |
426 | &sensor_dev_attr_in3_min.dev_attr.attr, |
427 | &sensor_dev_attr_in4_min.dev_attr.attr, |
428 | &sensor_dev_attr_in5_min.dev_attr.attr, |
429 | &sensor_dev_attr_in6_min.dev_attr.attr, |
430 | &sensor_dev_attr_in7_min.dev_attr.attr, |
431 | &sensor_dev_attr_in8_min.dev_attr.attr, |
432 | &sensor_dev_attr_in9_min.dev_attr.attr, |
433 | &sensor_dev_attr_in10_min.dev_attr.attr, |
434 | &sensor_dev_attr_in11_min.dev_attr.attr, |
435 | NULL |
436 | }; |
437 | |
438 | static struct attribute *max16065_max_attributes[] = { |
439 | &sensor_dev_attr_in0_max.dev_attr.attr, |
440 | &sensor_dev_attr_in1_max.dev_attr.attr, |
441 | &sensor_dev_attr_in2_max.dev_attr.attr, |
442 | &sensor_dev_attr_in3_max.dev_attr.attr, |
443 | &sensor_dev_attr_in4_max.dev_attr.attr, |
444 | &sensor_dev_attr_in5_max.dev_attr.attr, |
445 | &sensor_dev_attr_in6_max.dev_attr.attr, |
446 | &sensor_dev_attr_in7_max.dev_attr.attr, |
447 | &sensor_dev_attr_in8_max.dev_attr.attr, |
448 | &sensor_dev_attr_in9_max.dev_attr.attr, |
449 | &sensor_dev_attr_in10_max.dev_attr.attr, |
450 | &sensor_dev_attr_in11_max.dev_attr.attr, |
451 | NULL |
452 | }; |
453 | |
454 | static umode_t max16065_basic_is_visible(struct kobject *kobj, |
455 | struct attribute *a, int n) |
456 | { |
457 | struct device *dev = kobj_to_dev(kobj); |
458 | struct max16065_data *data = dev_get_drvdata(dev); |
459 | int index = n / 4; |
460 | |
461 | if (index >= data->num_adc || !data->range[index]) |
462 | return 0; |
463 | return a->mode; |
464 | } |
465 | |
466 | static umode_t max16065_secondary_is_visible(struct kobject *kobj, |
467 | struct attribute *a, int index) |
468 | { |
469 | struct device *dev = kobj_to_dev(kobj); |
470 | struct max16065_data *data = dev_get_drvdata(dev); |
471 | |
472 | if (index >= data->num_adc) |
473 | return 0; |
474 | return a->mode; |
475 | } |
476 | |
477 | static const struct attribute_group max16065_basic_group = { |
478 | .attrs = max16065_basic_attributes, |
479 | .is_visible = max16065_basic_is_visible, |
480 | }; |
481 | |
482 | static const struct attribute_group max16065_current_group = { |
483 | .attrs = max16065_current_attributes, |
484 | }; |
485 | |
486 | static const struct attribute_group max16065_min_group = { |
487 | .attrs = max16065_min_attributes, |
488 | .is_visible = max16065_secondary_is_visible, |
489 | }; |
490 | |
491 | static const struct attribute_group max16065_max_group = { |
492 | .attrs = max16065_max_attributes, |
493 | .is_visible = max16065_secondary_is_visible, |
494 | }; |
495 | |
496 | static const struct i2c_device_id max16065_id[]; |
497 | |
498 | static int max16065_probe(struct i2c_client *client) |
499 | { |
500 | struct i2c_adapter *adapter = client->adapter; |
501 | struct max16065_data *data; |
502 | struct device *dev = &client->dev; |
503 | struct device *hwmon_dev; |
504 | int i, j, val; |
505 | bool have_secondary; /* true if chip has secondary limits */ |
506 | bool secondary_is_max = false; /* secondary limits reflect max */ |
507 | int groups = 0; |
508 | const struct i2c_device_id *id = i2c_match_id(id: max16065_id, client); |
509 | |
510 | if (!i2c_check_functionality(adap: adapter, I2C_FUNC_SMBUS_BYTE_DATA |
511 | | I2C_FUNC_SMBUS_READ_WORD_DATA)) |
512 | return -ENODEV; |
513 | |
514 | data = devm_kzalloc(dev, size: sizeof(*data), GFP_KERNEL); |
515 | if (unlikely(!data)) |
516 | return -ENOMEM; |
517 | |
518 | data->client = client; |
519 | mutex_init(&data->update_lock); |
520 | |
521 | data->num_adc = max16065_num_adc[id->driver_data]; |
522 | data->have_current = max16065_have_current[id->driver_data]; |
523 | have_secondary = max16065_have_secondary[id->driver_data]; |
524 | |
525 | if (have_secondary) { |
526 | val = i2c_smbus_read_byte_data(client, MAX16065_SW_ENABLE); |
527 | if (unlikely(val < 0)) |
528 | return val; |
529 | secondary_is_max = val & MAX16065_WARNING_OV; |
530 | } |
531 | |
532 | /* Read scale registers, convert to range */ |
533 | for (i = 0; i < DIV_ROUND_UP(data->num_adc, 4); i++) { |
534 | val = i2c_smbus_read_byte_data(client, MAX16065_SCALE(i)); |
535 | if (unlikely(val < 0)) |
536 | return val; |
537 | for (j = 0; j < 4 && i * 4 + j < data->num_adc; j++) { |
538 | data->range[i * 4 + j] = |
539 | max16065_adc_range[(val >> (j * 2)) & 0x3]; |
540 | } |
541 | } |
542 | |
543 | /* Read limits */ |
544 | for (i = 0; i < MAX16065_NUM_LIMIT; i++) { |
545 | if (i == 0 && !have_secondary) |
546 | continue; |
547 | |
548 | for (j = 0; j < data->num_adc; j++) { |
549 | val = i2c_smbus_read_byte_data(client, |
550 | MAX16065_LIMIT(i, j)); |
551 | if (unlikely(val < 0)) |
552 | return val; |
553 | data->limit[i][j] = LIMIT_TO_MV(limit: val, range: data->range[j]); |
554 | } |
555 | } |
556 | |
557 | /* sysfs hooks */ |
558 | data->groups[groups++] = &max16065_basic_group; |
559 | if (have_secondary) |
560 | data->groups[groups++] = secondary_is_max ? |
561 | &max16065_max_group : &max16065_min_group; |
562 | |
563 | if (data->have_current) { |
564 | val = i2c_smbus_read_byte_data(client, MAX16065_CURR_CONTROL); |
565 | if (unlikely(val < 0)) |
566 | return val; |
567 | if (val & MAX16065_CURR_ENABLE) { |
568 | /* |
569 | * Current gain is 6, 12, 24, 48 based on values in |
570 | * bit 2,3. |
571 | */ |
572 | data->curr_gain = 6 << ((val >> 2) & 0x03); |
573 | data->range[MAX16065_NUM_ADC] |
574 | = max16065_csp_adc_range[(val >> 1) & 0x01]; |
575 | data->groups[groups++] = &max16065_current_group; |
576 | } else { |
577 | data->have_current = false; |
578 | } |
579 | } |
580 | |
581 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, name: client->name, |
582 | drvdata: data, groups: data->groups); |
583 | return PTR_ERR_OR_ZERO(ptr: hwmon_dev); |
584 | } |
585 | |
586 | static const struct i2c_device_id max16065_id[] = { |
587 | { "max16065" , max16065 }, |
588 | { "max16066" , max16066 }, |
589 | { "max16067" , max16067 }, |
590 | { "max16068" , max16068 }, |
591 | { "max16070" , max16070 }, |
592 | { "max16071" , max16071 }, |
593 | { } |
594 | }; |
595 | |
596 | MODULE_DEVICE_TABLE(i2c, max16065_id); |
597 | |
598 | /* This is the driver that will be inserted */ |
599 | static struct i2c_driver max16065_driver = { |
600 | .driver = { |
601 | .name = "max16065" , |
602 | }, |
603 | .probe = max16065_probe, |
604 | .id_table = max16065_id, |
605 | }; |
606 | |
607 | module_i2c_driver(max16065_driver); |
608 | |
609 | MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>" ); |
610 | MODULE_DESCRIPTION("MAX16065 driver" ); |
611 | MODULE_LICENSE("GPL" ); |
612 | |