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6#include <linux/err.h>
7#include <linux/hwmon.h>
8#include <linux/power_supply.h>
9#include <linux/slab.h>
10
11struct power_supply_hwmon {
12 struct power_supply *psy;
13 unsigned long *props;
14};
15
16static const char *const ps_temp_label[] = {
17 "temp",
18 "ambient temp",
19};
20
21static int power_supply_hwmon_in_to_property(u32 attr)
22{
23 switch (attr) {
24 case hwmon_in_average:
25 return POWER_SUPPLY_PROP_VOLTAGE_AVG;
26 case hwmon_in_min:
27 return POWER_SUPPLY_PROP_VOLTAGE_MIN;
28 case hwmon_in_max:
29 return POWER_SUPPLY_PROP_VOLTAGE_MAX;
30 case hwmon_in_input:
31 return POWER_SUPPLY_PROP_VOLTAGE_NOW;
32 default:
33 return -EINVAL;
34 }
35}
36
37static int power_supply_hwmon_curr_to_property(u32 attr)
38{
39 switch (attr) {
40 case hwmon_curr_average:
41 return POWER_SUPPLY_PROP_CURRENT_AVG;
42 case hwmon_curr_max:
43 return POWER_SUPPLY_PROP_CURRENT_MAX;
44 case hwmon_curr_input:
45 return POWER_SUPPLY_PROP_CURRENT_NOW;
46 default:
47 return -EINVAL;
48 }
49}
50
51static int power_supply_hwmon_temp_to_property(u32 attr, int channel)
52{
53 if (channel) {
54 switch (attr) {
55 case hwmon_temp_input:
56 return POWER_SUPPLY_PROP_TEMP_AMBIENT;
57 case hwmon_temp_min_alarm:
58 return POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN;
59 case hwmon_temp_max_alarm:
60 return POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX;
61 default:
62 break;
63 }
64 } else {
65 switch (attr) {
66 case hwmon_temp_input:
67 return POWER_SUPPLY_PROP_TEMP;
68 case hwmon_temp_max:
69 return POWER_SUPPLY_PROP_TEMP_MAX;
70 case hwmon_temp_min:
71 return POWER_SUPPLY_PROP_TEMP_MIN;
72 case hwmon_temp_min_alarm:
73 return POWER_SUPPLY_PROP_TEMP_ALERT_MIN;
74 case hwmon_temp_max_alarm:
75 return POWER_SUPPLY_PROP_TEMP_ALERT_MAX;
76 default:
77 break;
78 }
79 }
80
81 return -EINVAL;
82}
83
84static int
85power_supply_hwmon_to_property(enum hwmon_sensor_types type,
86 u32 attr, int channel)
87{
88 switch (type) {
89 case hwmon_in:
90 return power_supply_hwmon_in_to_property(attr);
91 case hwmon_curr:
92 return power_supply_hwmon_curr_to_property(attr);
93 case hwmon_temp:
94 return power_supply_hwmon_temp_to_property(attr, channel);
95 default:
96 return -EINVAL;
97 }
98}
99
100static bool power_supply_hwmon_is_a_label(enum hwmon_sensor_types type,
101 u32 attr)
102{
103 return type == hwmon_temp && attr == hwmon_temp_label;
104}
105
106struct hwmon_type_attr_list {
107 const u32 *attrs;
108 size_t n_attrs;
109};
110
111static const u32 ps_temp_attrs[] = {
112 hwmon_temp_input,
113 hwmon_temp_min, hwmon_temp_max,
114 hwmon_temp_min_alarm, hwmon_temp_max_alarm,
115};
116
117static const struct hwmon_type_attr_list ps_type_attrs[hwmon_max] = {
118 [hwmon_temp] = { ps_temp_attrs, ARRAY_SIZE(ps_temp_attrs) },
119};
120
121static bool power_supply_hwmon_has_input(
122 const struct power_supply_hwmon *psyhw,
123 enum hwmon_sensor_types type, int channel)
124{
125 const struct hwmon_type_attr_list *attr_list = &ps_type_attrs[type];
126 size_t i;
127
128 for (i = 0; i < attr_list->n_attrs; ++i) {
129 int prop = power_supply_hwmon_to_property(type,
130 attr_list->attrs[i], channel);
131
132 if (prop >= 0 && test_bit(prop, psyhw->props))
133 return true;
134 }
135
136 return false;
137}
138
139static bool power_supply_hwmon_is_writable(enum hwmon_sensor_types type,
140 u32 attr)
141{
142 switch (type) {
143 case hwmon_in:
144 return attr == hwmon_in_min ||
145 attr == hwmon_in_max;
146 case hwmon_curr:
147 return attr == hwmon_curr_max;
148 case hwmon_temp:
149 return attr == hwmon_temp_max ||
150 attr == hwmon_temp_min ||
151 attr == hwmon_temp_min_alarm ||
152 attr == hwmon_temp_max_alarm;
153 default:
154 return false;
155 }
156}
157
158static umode_t power_supply_hwmon_is_visible(const void *data,
159 enum hwmon_sensor_types type,
160 u32 attr, int channel)
161{
162 const struct power_supply_hwmon *psyhw = data;
163 int prop;
164
165 if (power_supply_hwmon_is_a_label(type, attr)) {
166 if (power_supply_hwmon_has_input(psyhw, type, channel))
167 return 0444;
168 else
169 return 0;
170 }
171
172 prop = power_supply_hwmon_to_property(type, attr, channel);
173 if (prop < 0 || !test_bit(prop, psyhw->props))
174 return 0;
175
176 if (power_supply_property_is_writeable(psyhw->psy, prop) > 0 &&
177 power_supply_hwmon_is_writable(type, attr))
178 return 0644;
179
180 return 0444;
181}
182
183static int power_supply_hwmon_read_string(struct device *dev,
184 enum hwmon_sensor_types type,
185 u32 attr, int channel,
186 const char **str)
187{
188 switch (type) {
189 case hwmon_temp:
190 *str = ps_temp_label[channel];
191 break;
192 default:
193
194
195
196
197
198
199 break;
200 }
201
202 return 0;
203}
204
205static int
206power_supply_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
207 u32 attr, int channel, long *val)
208{
209 struct power_supply_hwmon *psyhw = dev_get_drvdata(dev);
210 struct power_supply *psy = psyhw->psy;
211 union power_supply_propval pspval;
212 int ret, prop;
213
214 prop = power_supply_hwmon_to_property(type, attr, channel);
215 if (prop < 0)
216 return prop;
217
218 ret = power_supply_get_property(psy, prop, &pspval);
219 if (ret)
220 return ret;
221
222 switch (type) {
223
224
225
226
227
228 case hwmon_curr:
229 case hwmon_in:
230 pspval.intval = DIV_ROUND_CLOSEST(pspval.intval, 1000);
231 break;
232
233
234
235 case hwmon_temp:
236 if (check_mul_overflow(pspval.intval, 100,
237 &pspval.intval))
238 return -EOVERFLOW;
239 break;
240 default:
241 return -EINVAL;
242 }
243
244 *val = pspval.intval;
245
246 return 0;
247}
248
249static int
250power_supply_hwmon_write(struct device *dev, enum hwmon_sensor_types type,
251 u32 attr, int channel, long val)
252{
253 struct power_supply_hwmon *psyhw = dev_get_drvdata(dev);
254 struct power_supply *psy = psyhw->psy;
255 union power_supply_propval pspval;
256 int prop;
257
258 prop = power_supply_hwmon_to_property(type, attr, channel);
259 if (prop < 0)
260 return prop;
261
262 pspval.intval = val;
263
264 switch (type) {
265
266
267
268
269
270 case hwmon_curr:
271 case hwmon_in:
272 if (check_mul_overflow(pspval.intval, 1000,
273 &pspval.intval))
274 return -EOVERFLOW;
275 break;
276
277
278
279 case hwmon_temp:
280 pspval.intval = DIV_ROUND_CLOSEST(pspval.intval, 100);
281 break;
282 default:
283 return -EINVAL;
284 }
285
286 return power_supply_set_property(psy, prop, &pspval);
287}
288
289static const struct hwmon_ops power_supply_hwmon_ops = {
290 .is_visible = power_supply_hwmon_is_visible,
291 .read = power_supply_hwmon_read,
292 .write = power_supply_hwmon_write,
293 .read_string = power_supply_hwmon_read_string,
294};
295
296static const struct hwmon_channel_info *power_supply_hwmon_info[] = {
297 HWMON_CHANNEL_INFO(temp,
298 HWMON_T_LABEL |
299 HWMON_T_INPUT |
300 HWMON_T_MAX |
301 HWMON_T_MIN |
302 HWMON_T_MIN_ALARM |
303 HWMON_T_MIN_ALARM,
304
305 HWMON_T_LABEL |
306 HWMON_T_INPUT |
307 HWMON_T_MIN_ALARM |
308 HWMON_T_LABEL |
309 HWMON_T_MAX_ALARM),
310
311 HWMON_CHANNEL_INFO(curr,
312 HWMON_C_AVERAGE |
313 HWMON_C_MAX |
314 HWMON_C_INPUT),
315
316 HWMON_CHANNEL_INFO(in,
317 HWMON_I_AVERAGE |
318 HWMON_I_MIN |
319 HWMON_I_MAX |
320 HWMON_I_INPUT),
321 NULL
322};
323
324static const struct hwmon_chip_info power_supply_hwmon_chip_info = {
325 .ops = &power_supply_hwmon_ops,
326 .info = power_supply_hwmon_info,
327};
328
329static void power_supply_hwmon_bitmap_free(void *data)
330{
331 bitmap_free(data);
332}
333
334int power_supply_add_hwmon_sysfs(struct power_supply *psy)
335{
336 const struct power_supply_desc *desc = psy->desc;
337 struct power_supply_hwmon *psyhw;
338 struct device *dev = &psy->dev;
339 struct device *hwmon;
340 int ret, i;
341 const char *name;
342
343 if (!devres_open_group(dev, power_supply_add_hwmon_sysfs,
344 GFP_KERNEL))
345 return -ENOMEM;
346
347 psyhw = devm_kzalloc(dev, sizeof(*psyhw), GFP_KERNEL);
348 if (!psyhw) {
349 ret = -ENOMEM;
350 goto error;
351 }
352
353 psyhw->psy = psy;
354 psyhw->props = bitmap_zalloc(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG + 1,
355 GFP_KERNEL);
356 if (!psyhw->props) {
357 ret = -ENOMEM;
358 goto error;
359 }
360
361 ret = devm_add_action_or_reset(dev, power_supply_hwmon_bitmap_free,
362 psyhw->props);
363 if (ret)
364 goto error;
365
366 for (i = 0; i < desc->num_properties; i++) {
367 const enum power_supply_property prop = desc->properties[i];
368
369 switch (prop) {
370 case POWER_SUPPLY_PROP_CURRENT_AVG:
371 case POWER_SUPPLY_PROP_CURRENT_MAX:
372 case POWER_SUPPLY_PROP_CURRENT_NOW:
373 case POWER_SUPPLY_PROP_TEMP:
374 case POWER_SUPPLY_PROP_TEMP_MAX:
375 case POWER_SUPPLY_PROP_TEMP_MIN:
376 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
377 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
378 case POWER_SUPPLY_PROP_TEMP_AMBIENT:
379 case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
380 case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
381 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
382 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
383 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
384 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
385 set_bit(prop, psyhw->props);
386 break;
387 default:
388 break;
389 }
390 }
391
392 name = psy->desc->name;
393 if (strchr(name, '-')) {
394 char *new_name;
395
396 new_name = devm_kstrdup(dev, name, GFP_KERNEL);
397 if (!new_name) {
398 ret = -ENOMEM;
399 goto error;
400 }
401 strreplace(new_name, '-', '_');
402 name = new_name;
403 }
404 hwmon = devm_hwmon_device_register_with_info(dev, name,
405 psyhw,
406 &power_supply_hwmon_chip_info,
407 NULL);
408 ret = PTR_ERR_OR_ZERO(hwmon);
409 if (ret)
410 goto error;
411
412 devres_close_group(dev, power_supply_add_hwmon_sysfs);
413 return 0;
414error:
415 devres_release_group(dev, NULL);
416 return ret;
417}
418
419void power_supply_remove_hwmon_sysfs(struct power_supply *psy)
420{
421 devres_release_group(&psy->dev, power_supply_add_hwmon_sysfs);
422}
423
