1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * HWMON Driver for Dialog DA9052
4 *
5 * Copyright(c) 2012 Dialog Semiconductor Ltd.
6 *
7 * Author: David Dajun Chen <dchen@diasemi.com>
8 */
9
10 #include <linux/err.h>
11 #include <linux/hwmon.h>
12 #include <linux/hwmon-sysfs.h>
13 #include <linux/init.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/slab.h>
17 #include <linux/platform_device.h>
18 #include <linux/property.h>
19
20 #include <linux/mfd/da9052/da9052.h>
21 #include <linux/mfd/da9052/reg.h>
22 #include <linux/regulator/consumer.h>
23
24 struct da9052_hwmon {
25 struct da9052 *da9052;
26 struct mutex hwmon_lock;
27 bool tsi_as_adc;
28 int tsiref_mv;
29 struct regulator *tsiref;
30 struct completion tsidone;
31 };
32
33 static const char * const input_names[] = {
34 [DA9052_ADC_VDDOUT] = "VDDOUT",
35 [DA9052_ADC_ICH] = "CHARGING CURRENT",
36 [DA9052_ADC_TBAT] = "BATTERY TEMP",
37 [DA9052_ADC_VBAT] = "BATTERY VOLTAGE",
38 [DA9052_ADC_IN4] = "ADC IN4",
39 [DA9052_ADC_IN5] = "ADC IN5",
40 [DA9052_ADC_IN6] = "ADC IN6",
41 [DA9052_ADC_TSI_XP] = "ADC TS X+",
42 [DA9052_ADC_TSI_YP] = "ADC TS Y+",
43 [DA9052_ADC_TSI_XN] = "ADC TS X-",
44 [DA9052_ADC_TSI_YN] = "ADC TS Y-",
45 [DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP",
46 [DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE",
47 };
48
49 /* Conversion function for VDDOUT and VBAT */
volt_reg_to_mv(int value)50 static inline int volt_reg_to_mv(int value)
51 {
52 return DIV_ROUND_CLOSEST(value * 2000, 1023) + 2500;
53 }
54
55 /* Conversion function for ADC channels 4, 5 and 6 */
input_reg_to_mv(int value)56 static inline int input_reg_to_mv(int value)
57 {
58 return DIV_ROUND_CLOSEST(value * 2500, 1023);
59 }
60
61 /* Conversion function for VBBAT */
vbbat_reg_to_mv(int value)62 static inline int vbbat_reg_to_mv(int value)
63 {
64 return DIV_ROUND_CLOSEST(value * 5000, 1023);
65 }
66
input_tsireg_to_mv(struct da9052_hwmon * hwmon,int value)67 static inline int input_tsireg_to_mv(struct da9052_hwmon *hwmon, int value)
68 {
69 return DIV_ROUND_CLOSEST(value * hwmon->tsiref_mv, 1023);
70 }
71
da9052_enable_vddout_channel(struct da9052 * da9052)72 static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
73 {
74 return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
75 DA9052_ADCCONT_AUTOVDDEN,
76 DA9052_ADCCONT_AUTOVDDEN);
77 }
78
da9052_disable_vddout_channel(struct da9052 * da9052)79 static inline int da9052_disable_vddout_channel(struct da9052 *da9052)
80 {
81 return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
82 DA9052_ADCCONT_AUTOVDDEN, 0);
83 }
84
da9052_vddout_show(struct device * dev,struct device_attribute * devattr,char * buf)85 static ssize_t da9052_vddout_show(struct device *dev,
86 struct device_attribute *devattr, char *buf)
87 {
88 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
89 int ret, vdd;
90
91 mutex_lock(&hwmon->hwmon_lock);
92
93 ret = da9052_enable_vddout_channel(hwmon->da9052);
94 if (ret < 0)
95 goto hwmon_err;
96
97 vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG);
98 if (vdd < 0) {
99 ret = vdd;
100 goto hwmon_err_release;
101 }
102
103 ret = da9052_disable_vddout_channel(hwmon->da9052);
104 if (ret < 0)
105 goto hwmon_err;
106
107 mutex_unlock(&hwmon->hwmon_lock);
108 return sprintf(buf, "%d\n", volt_reg_to_mv(vdd));
109
110 hwmon_err_release:
111 da9052_disable_vddout_channel(hwmon->da9052);
112 hwmon_err:
113 mutex_unlock(&hwmon->hwmon_lock);
114 return ret;
115 }
116
da9052_ich_show(struct device * dev,struct device_attribute * devattr,char * buf)117 static ssize_t da9052_ich_show(struct device *dev,
118 struct device_attribute *devattr, char *buf)
119 {
120 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
121 int ret;
122
123 ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG);
124 if (ret < 0)
125 return ret;
126
127 /* Equivalent to 3.9mA/bit in register ICHG_AV */
128 return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10));
129 }
130
da9052_tbat_show(struct device * dev,struct device_attribute * devattr,char * buf)131 static ssize_t da9052_tbat_show(struct device *dev,
132 struct device_attribute *devattr, char *buf)
133 {
134 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
135
136 return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052));
137 }
138
da9052_vbat_show(struct device * dev,struct device_attribute * devattr,char * buf)139 static ssize_t da9052_vbat_show(struct device *dev,
140 struct device_attribute *devattr, char *buf)
141 {
142 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
143 int ret;
144
145 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT);
146 if (ret < 0)
147 return ret;
148
149 return sprintf(buf, "%d\n", volt_reg_to_mv(ret));
150 }
151
da9052_misc_channel_show(struct device * dev,struct device_attribute * devattr,char * buf)152 static ssize_t da9052_misc_channel_show(struct device *dev,
153 struct device_attribute *devattr,
154 char *buf)
155 {
156 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
157 int channel = to_sensor_dev_attr(devattr)->index;
158 int ret;
159
160 ret = da9052_adc_manual_read(hwmon->da9052, channel);
161 if (ret < 0)
162 return ret;
163
164 return sprintf(buf, "%d\n", input_reg_to_mv(ret));
165 }
166
da9052_request_tsi_read(struct da9052_hwmon * hwmon,int channel)167 static int da9052_request_tsi_read(struct da9052_hwmon *hwmon, int channel)
168 {
169 u8 val = DA9052_TSICONTB_TSIMAN;
170
171 switch (channel) {
172 case DA9052_ADC_TSI_XP:
173 val |= DA9052_TSICONTB_TSIMUX_XP;
174 break;
175 case DA9052_ADC_TSI_YP:
176 val |= DA9052_TSICONTB_TSIMUX_YP;
177 break;
178 case DA9052_ADC_TSI_XN:
179 val |= DA9052_TSICONTB_TSIMUX_XN;
180 break;
181 case DA9052_ADC_TSI_YN:
182 val |= DA9052_TSICONTB_TSIMUX_YN;
183 break;
184 }
185
186 return da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_B_REG, val);
187 }
188
da9052_get_tsi_result(struct da9052_hwmon * hwmon,int channel)189 static int da9052_get_tsi_result(struct da9052_hwmon *hwmon, int channel)
190 {
191 u8 regs[3];
192 int msb, lsb, err;
193
194 /* block read to avoid separation of MSB and LSB */
195 err = da9052_group_read(hwmon->da9052, DA9052_TSI_X_MSB_REG,
196 ARRAY_SIZE(regs), regs);
197 if (err)
198 return err;
199
200 switch (channel) {
201 case DA9052_ADC_TSI_XP:
202 case DA9052_ADC_TSI_XN:
203 msb = regs[0] << DA9052_TSILSB_TSIXL_BITS;
204 lsb = regs[2] & DA9052_TSILSB_TSIXL;
205 lsb >>= DA9052_TSILSB_TSIXL_SHIFT;
206 break;
207 case DA9052_ADC_TSI_YP:
208 case DA9052_ADC_TSI_YN:
209 msb = regs[1] << DA9052_TSILSB_TSIYL_BITS;
210 lsb = regs[2] & DA9052_TSILSB_TSIYL;
211 lsb >>= DA9052_TSILSB_TSIYL_SHIFT;
212 break;
213 default:
214 return -EINVAL;
215 }
216
217 return msb | lsb;
218 }
219
220
__da9052_read_tsi(struct device * dev,int channel)221 static ssize_t __da9052_read_tsi(struct device *dev, int channel)
222 {
223 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
224 int ret;
225
226 reinit_completion(&hwmon->tsidone);
227
228 ret = da9052_request_tsi_read(hwmon, channel);
229 if (ret < 0)
230 return ret;
231
232 /* Wait for an conversion done interrupt */
233 if (!wait_for_completion_timeout(&hwmon->tsidone,
234 msecs_to_jiffies(500)))
235 return -ETIMEDOUT;
236
237 return da9052_get_tsi_result(hwmon, channel);
238 }
239
da9052_tsi_show(struct device * dev,struct device_attribute * devattr,char * buf)240 static ssize_t da9052_tsi_show(struct device *dev,
241 struct device_attribute *devattr, char *buf)
242 {
243 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
244 int channel = to_sensor_dev_attr(devattr)->index;
245 int ret;
246
247 mutex_lock(&hwmon->hwmon_lock);
248 ret = __da9052_read_tsi(dev, channel);
249 mutex_unlock(&hwmon->hwmon_lock);
250
251 if (ret < 0)
252 return ret;
253 else
254 return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret));
255 }
256
da9052_tjunc_show(struct device * dev,struct device_attribute * devattr,char * buf)257 static ssize_t da9052_tjunc_show(struct device *dev,
258 struct device_attribute *devattr, char *buf)
259 {
260 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
261 int tjunc;
262 int toffset;
263
264 tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
265 if (tjunc < 0)
266 return tjunc;
267
268 toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
269 if (toffset < 0)
270 return toffset;
271
272 /*
273 * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
274 * T_OFFSET is a trim value used to improve accuracy of the result
275 */
276 return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800);
277 }
278
da9052_vbbat_show(struct device * dev,struct device_attribute * devattr,char * buf)279 static ssize_t da9052_vbbat_show(struct device *dev,
280 struct device_attribute *devattr, char *buf)
281 {
282 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
283 int ret;
284
285 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
286 if (ret < 0)
287 return ret;
288
289 return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret));
290 }
291
label_show(struct device * dev,struct device_attribute * devattr,char * buf)292 static ssize_t label_show(struct device *dev,
293 struct device_attribute *devattr, char *buf)
294 {
295 return sprintf(buf, "%s\n",
296 input_names[to_sensor_dev_attr(devattr)->index]);
297 }
298
da9052_channel_is_visible(struct kobject * kobj,struct attribute * attr,int index)299 static umode_t da9052_channel_is_visible(struct kobject *kobj,
300 struct attribute *attr, int index)
301 {
302 struct device *dev = container_of(kobj, struct device, kobj);
303 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
304 struct device_attribute *dattr = container_of(attr,
305 struct device_attribute, attr);
306 struct sensor_device_attribute *sattr = to_sensor_dev_attr(dattr);
307
308 if (!hwmon->tsi_as_adc) {
309 switch (sattr->index) {
310 case DA9052_ADC_TSI_XP:
311 case DA9052_ADC_TSI_YP:
312 case DA9052_ADC_TSI_XN:
313 case DA9052_ADC_TSI_YN:
314 return 0;
315 }
316 }
317
318 return attr->mode;
319 }
320
321 static SENSOR_DEVICE_ATTR_RO(in0_input, da9052_vddout, DA9052_ADC_VDDOUT);
322 static SENSOR_DEVICE_ATTR_RO(in0_label, label, DA9052_ADC_VDDOUT);
323 static SENSOR_DEVICE_ATTR_RO(in3_input, da9052_vbat, DA9052_ADC_VBAT);
324 static SENSOR_DEVICE_ATTR_RO(in3_label, label, DA9052_ADC_VBAT);
325 static SENSOR_DEVICE_ATTR_RO(in4_input, da9052_misc_channel, DA9052_ADC_IN4);
326 static SENSOR_DEVICE_ATTR_RO(in4_label, label, DA9052_ADC_IN4);
327 static SENSOR_DEVICE_ATTR_RO(in5_input, da9052_misc_channel, DA9052_ADC_IN5);
328 static SENSOR_DEVICE_ATTR_RO(in5_label, label, DA9052_ADC_IN5);
329 static SENSOR_DEVICE_ATTR_RO(in6_input, da9052_misc_channel, DA9052_ADC_IN6);
330 static SENSOR_DEVICE_ATTR_RO(in6_label, label, DA9052_ADC_IN6);
331 static SENSOR_DEVICE_ATTR_RO(in9_input, da9052_vbbat, DA9052_ADC_VBBAT);
332 static SENSOR_DEVICE_ATTR_RO(in9_label, label, DA9052_ADC_VBBAT);
333
334 static SENSOR_DEVICE_ATTR_RO(in70_input, da9052_tsi, DA9052_ADC_TSI_XP);
335 static SENSOR_DEVICE_ATTR_RO(in70_label, label, DA9052_ADC_TSI_XP);
336 static SENSOR_DEVICE_ATTR_RO(in71_input, da9052_tsi, DA9052_ADC_TSI_XN);
337 static SENSOR_DEVICE_ATTR_RO(in71_label, label, DA9052_ADC_TSI_XN);
338 static SENSOR_DEVICE_ATTR_RO(in72_input, da9052_tsi, DA9052_ADC_TSI_YP);
339 static SENSOR_DEVICE_ATTR_RO(in72_label, label, DA9052_ADC_TSI_YP);
340 static SENSOR_DEVICE_ATTR_RO(in73_input, da9052_tsi, DA9052_ADC_TSI_YN);
341 static SENSOR_DEVICE_ATTR_RO(in73_label, label, DA9052_ADC_TSI_YN);
342
343 static SENSOR_DEVICE_ATTR_RO(curr1_input, da9052_ich, DA9052_ADC_ICH);
344 static SENSOR_DEVICE_ATTR_RO(curr1_label, label, DA9052_ADC_ICH);
345
346 static SENSOR_DEVICE_ATTR_RO(temp2_input, da9052_tbat, DA9052_ADC_TBAT);
347 static SENSOR_DEVICE_ATTR_RO(temp2_label, label, DA9052_ADC_TBAT);
348 static SENSOR_DEVICE_ATTR_RO(temp8_input, da9052_tjunc, DA9052_ADC_TJUNC);
349 static SENSOR_DEVICE_ATTR_RO(temp8_label, label, DA9052_ADC_TJUNC);
350
351 static struct attribute *da9052_attrs[] = {
352 &sensor_dev_attr_in0_input.dev_attr.attr,
353 &sensor_dev_attr_in0_label.dev_attr.attr,
354 &sensor_dev_attr_in3_input.dev_attr.attr,
355 &sensor_dev_attr_in3_label.dev_attr.attr,
356 &sensor_dev_attr_in4_input.dev_attr.attr,
357 &sensor_dev_attr_in4_label.dev_attr.attr,
358 &sensor_dev_attr_in5_input.dev_attr.attr,
359 &sensor_dev_attr_in5_label.dev_attr.attr,
360 &sensor_dev_attr_in6_input.dev_attr.attr,
361 &sensor_dev_attr_in6_label.dev_attr.attr,
362 &sensor_dev_attr_in70_input.dev_attr.attr,
363 &sensor_dev_attr_in70_label.dev_attr.attr,
364 &sensor_dev_attr_in71_input.dev_attr.attr,
365 &sensor_dev_attr_in71_label.dev_attr.attr,
366 &sensor_dev_attr_in72_input.dev_attr.attr,
367 &sensor_dev_attr_in72_label.dev_attr.attr,
368 &sensor_dev_attr_in73_input.dev_attr.attr,
369 &sensor_dev_attr_in73_label.dev_attr.attr,
370 &sensor_dev_attr_in9_input.dev_attr.attr,
371 &sensor_dev_attr_in9_label.dev_attr.attr,
372 &sensor_dev_attr_curr1_input.dev_attr.attr,
373 &sensor_dev_attr_curr1_label.dev_attr.attr,
374 &sensor_dev_attr_temp2_input.dev_attr.attr,
375 &sensor_dev_attr_temp2_label.dev_attr.attr,
376 &sensor_dev_attr_temp8_input.dev_attr.attr,
377 &sensor_dev_attr_temp8_label.dev_attr.attr,
378 NULL
379 };
380
381 static const struct attribute_group da9052_group = {
382 .attrs = da9052_attrs,
383 .is_visible = da9052_channel_is_visible,
384 };
385 __ATTRIBUTE_GROUPS(da9052);
386
da9052_tsi_datardy_irq(int irq,void * data)387 static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data)
388 {
389 struct da9052_hwmon *hwmon = data;
390
391 complete(&hwmon->tsidone);
392 return IRQ_HANDLED;
393 }
394
da9052_hwmon_probe(struct platform_device * pdev)395 static int da9052_hwmon_probe(struct platform_device *pdev)
396 {
397 struct device *dev = &pdev->dev;
398 struct da9052_hwmon *hwmon;
399 struct device *hwmon_dev;
400 int err;
401
402 hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL);
403 if (!hwmon)
404 return -ENOMEM;
405
406 platform_set_drvdata(pdev, hwmon);
407
408 mutex_init(&hwmon->hwmon_lock);
409 hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
410
411 init_completion(&hwmon->tsidone);
412
413 hwmon->tsi_as_adc =
414 device_property_read_bool(pdev->dev.parent, "dlg,tsi-as-adc");
415
416 if (hwmon->tsi_as_adc) {
417 hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref");
418 if (IS_ERR(hwmon->tsiref)) {
419 err = PTR_ERR(hwmon->tsiref);
420 dev_err(&pdev->dev, "failed to get tsiref: %d", err);
421 return err;
422 }
423
424 err = regulator_enable(hwmon->tsiref);
425 if (err)
426 return err;
427
428 hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref);
429 if (hwmon->tsiref_mv < 0) {
430 err = hwmon->tsiref_mv;
431 goto exit_regulator;
432 }
433
434 /* convert from microvolt (DT) to millivolt (hwmon) */
435 hwmon->tsiref_mv /= 1000;
436
437 /* TSIREF limits from datasheet */
438 if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) {
439 dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d",
440 hwmon->tsiref_mv);
441 err = -ENXIO;
442 goto exit_regulator;
443 }
444
445 /* disable touchscreen features */
446 da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00);
447
448 /* Sample every 1ms */
449 da9052_reg_update(hwmon->da9052, DA9052_ADC_CONT_REG,
450 DA9052_ADCCONT_ADCMODE,
451 DA9052_ADCCONT_ADCMODE);
452
453 err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY,
454 "tsiready-irq", da9052_tsi_datardy_irq,
455 hwmon);
456 if (err) {
457 dev_err(&pdev->dev, "Failed to register TSIRDY IRQ: %d",
458 err);
459 goto exit_regulator;
460 }
461 }
462
463 hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
464 hwmon,
465 da9052_groups);
466 err = PTR_ERR_OR_ZERO(hwmon_dev);
467 if (err)
468 goto exit_irq;
469
470 return 0;
471
472 exit_irq:
473 if (hwmon->tsi_as_adc)
474 da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
475 exit_regulator:
476 if (hwmon->tsiref)
477 regulator_disable(hwmon->tsiref);
478
479 return err;
480 }
481
da9052_hwmon_remove(struct platform_device * pdev)482 static int da9052_hwmon_remove(struct platform_device *pdev)
483 {
484 struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
485
486 if (hwmon->tsi_as_adc) {
487 da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
488 regulator_disable(hwmon->tsiref);
489 }
490
491 return 0;
492 }
493
494 static struct platform_driver da9052_hwmon_driver = {
495 .probe = da9052_hwmon_probe,
496 .remove = da9052_hwmon_remove,
497 .driver = {
498 .name = "da9052-hwmon",
499 },
500 };
501
502 module_platform_driver(da9052_hwmon_driver);
503
504 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
505 MODULE_DESCRIPTION("DA9052 HWMON driver");
506 MODULE_LICENSE("GPL");
507 MODULE_ALIAS("platform:da9052-hwmon");
508
