1/*
2 * HWMON Driver for Dialog DA9052
3 *
4 * Copyright(c) 2012 Dialog Semiconductor Ltd.
5 *
6 * Author: David Dajun Chen <dchen@diasemi.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 */
14
15#include <linux/err.h>
16#include <linux/hwmon.h>
17#include <linux/hwmon-sysfs.h>
18#include <linux/init.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/slab.h>
22#include <linux/platform_device.h>
23#include <linux/property.h>
24
25#include <linux/mfd/da9052/da9052.h>
26#include <linux/mfd/da9052/reg.h>
27#include <linux/regulator/consumer.h>
28
29struct da9052_hwmon {
30 struct da9052 *da9052;
31 struct mutex hwmon_lock;
32 bool tsi_as_adc;
33 int tsiref_mv;
34 struct regulator *tsiref;
35 struct completion tsidone;
36};
37
38static const char * const input_names[] = {
39 [DA9052_ADC_VDDOUT] = "VDDOUT",
40 [DA9052_ADC_ICH] = "CHARGING CURRENT",
41 [DA9052_ADC_TBAT] = "BATTERY TEMP",
42 [DA9052_ADC_VBAT] = "BATTERY VOLTAGE",
43 [DA9052_ADC_IN4] = "ADC IN4",
44 [DA9052_ADC_IN5] = "ADC IN5",
45 [DA9052_ADC_IN6] = "ADC IN6",
46 [DA9052_ADC_TSI_XP] = "ADC TS X+",
47 [DA9052_ADC_TSI_YP] = "ADC TS Y+",
48 [DA9052_ADC_TSI_XN] = "ADC TS X-",
49 [DA9052_ADC_TSI_YN] = "ADC TS Y-",
50 [DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP",
51 [DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE",
52};
53
54/* Conversion function for VDDOUT and VBAT */
55static inline int volt_reg_to_mv(int value)
56{
57 return DIV_ROUND_CLOSEST(value * 2000, 1023) + 2500;
58}
59
60/* Conversion function for ADC channels 4, 5 and 6 */
61static inline int input_reg_to_mv(int value)
62{
63 return DIV_ROUND_CLOSEST(value * 2500, 1023);
64}
65
66/* Conversion function for VBBAT */
67static inline int vbbat_reg_to_mv(int value)
68{
69 return DIV_ROUND_CLOSEST(value * 5000, 1023);
70}
71
72static inline int input_tsireg_to_mv(struct da9052_hwmon *hwmon, int value)
73{
74 return DIV_ROUND_CLOSEST(value * hwmon->tsiref_mv, 1023);
75}
76
77static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
78{
79 return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
80 DA9052_ADCCONT_AUTOVDDEN,
81 DA9052_ADCCONT_AUTOVDDEN);
82}
83
84static inline int da9052_disable_vddout_channel(struct da9052 *da9052)
85{
86 return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
87 DA9052_ADCCONT_AUTOVDDEN, 0);
88}
89
90static ssize_t da9052_vddout_show(struct device *dev,
91 struct device_attribute *devattr, char *buf)
92{
93 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
94 int ret, vdd;
95
96 mutex_lock(&hwmon->hwmon_lock);
97
98 ret = da9052_enable_vddout_channel(hwmon->da9052);
99 if (ret < 0)
100 goto hwmon_err;
101
102 vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG);
103 if (vdd < 0) {
104 ret = vdd;
105 goto hwmon_err_release;
106 }
107
108 ret = da9052_disable_vddout_channel(hwmon->da9052);
109 if (ret < 0)
110 goto hwmon_err;
111
112 mutex_unlock(&hwmon->hwmon_lock);
113 return sprintf(buf, "%d\n", volt_reg_to_mv(vdd));
114
115hwmon_err_release:
116 da9052_disable_vddout_channel(hwmon->da9052);
117hwmon_err:
118 mutex_unlock(&hwmon->hwmon_lock);
119 return ret;
120}
121
122static ssize_t da9052_ich_show(struct device *dev,
123 struct device_attribute *devattr, char *buf)
124{
125 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
126 int ret;
127
128 ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG);
129 if (ret < 0)
130 return ret;
131
132 /* Equivalent to 3.9mA/bit in register ICHG_AV */
133 return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10));
134}
135
136static ssize_t da9052_tbat_show(struct device *dev,
137 struct device_attribute *devattr, char *buf)
138{
139 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
140
141 return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052));
142}
143
144static ssize_t da9052_vbat_show(struct device *dev,
145 struct device_attribute *devattr, char *buf)
146{
147 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
148 int ret;
149
150 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT);
151 if (ret < 0)
152 return ret;
153
154 return sprintf(buf, "%d\n", volt_reg_to_mv(ret));
155}
156
157static ssize_t da9052_misc_channel_show(struct device *dev,
158 struct device_attribute *devattr,
159 char *buf)
160{
161 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
162 int channel = to_sensor_dev_attr(devattr)->index;
163 int ret;
164
165 ret = da9052_adc_manual_read(hwmon->da9052, channel);
166 if (ret < 0)
167 return ret;
168
169 return sprintf(buf, "%d\n", input_reg_to_mv(ret));
170}
171
172static int da9052_request_tsi_read(struct da9052_hwmon *hwmon, int channel)
173{
174 u8 val = DA9052_TSICONTB_TSIMAN;
175
176 switch (channel) {
177 case DA9052_ADC_TSI_XP:
178 val |= DA9052_TSICONTB_TSIMUX_XP;
179 break;
180 case DA9052_ADC_TSI_YP:
181 val |= DA9052_TSICONTB_TSIMUX_YP;
182 break;
183 case DA9052_ADC_TSI_XN:
184 val |= DA9052_TSICONTB_TSIMUX_XN;
185 break;
186 case DA9052_ADC_TSI_YN:
187 val |= DA9052_TSICONTB_TSIMUX_YN;
188 break;
189 }
190
191 return da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_B_REG, val);
192}
193
194static int da9052_get_tsi_result(struct da9052_hwmon *hwmon, int channel)
195{
196 u8 regs[3];
197 int msb, lsb, err;
198
199 /* block read to avoid separation of MSB and LSB */
200 err = da9052_group_read(hwmon->da9052, DA9052_TSI_X_MSB_REG,
201 ARRAY_SIZE(regs), regs);
202 if (err)
203 return err;
204
205 switch (channel) {
206 case DA9052_ADC_TSI_XP:
207 case DA9052_ADC_TSI_XN:
208 msb = regs[0] << DA9052_TSILSB_TSIXL_BITS;
209 lsb = regs[2] & DA9052_TSILSB_TSIXL;
210 lsb >>= DA9052_TSILSB_TSIXL_SHIFT;
211 break;
212 case DA9052_ADC_TSI_YP:
213 case DA9052_ADC_TSI_YN:
214 msb = regs[1] << DA9052_TSILSB_TSIYL_BITS;
215 lsb = regs[2] & DA9052_TSILSB_TSIYL;
216 lsb >>= DA9052_TSILSB_TSIYL_SHIFT;
217 break;
218 default:
219 return -EINVAL;
220 }
221
222 return msb | lsb;
223}
224
225
226static ssize_t __da9052_read_tsi(struct device *dev, int channel)
227{
228 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
229 int ret;
230
231 reinit_completion(&hwmon->tsidone);
232
233 ret = da9052_request_tsi_read(hwmon, channel);
234 if (ret < 0)
235 return ret;
236
237 /* Wait for an conversion done interrupt */
238 if (!wait_for_completion_timeout(&hwmon->tsidone,
239 msecs_to_jiffies(500)))
240 return -ETIMEDOUT;
241
242 return da9052_get_tsi_result(hwmon, channel);
243}
244
245static ssize_t da9052_tsi_show(struct device *dev,
246 struct device_attribute *devattr, char *buf)
247{
248 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
249 int channel = to_sensor_dev_attr(devattr)->index;
250 int ret;
251
252 mutex_lock(&hwmon->hwmon_lock);
253 ret = __da9052_read_tsi(dev, channel);
254 mutex_unlock(&hwmon->hwmon_lock);
255
256 if (ret < 0)
257 return ret;
258 else
259 return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret));
260}
261
262static ssize_t da9052_tjunc_show(struct device *dev,
263 struct device_attribute *devattr, char *buf)
264{
265 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
266 int tjunc;
267 int toffset;
268
269 tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
270 if (tjunc < 0)
271 return tjunc;
272
273 toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
274 if (toffset < 0)
275 return toffset;
276
277 /*
278 * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
279 * T_OFFSET is a trim value used to improve accuracy of the result
280 */
281 return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800);
282}
283
284static ssize_t da9052_vbbat_show(struct device *dev,
285 struct device_attribute *devattr, char *buf)
286{
287 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
288 int ret;
289
290 ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
291 if (ret < 0)
292 return ret;
293
294 return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret));
295}
296
297static ssize_t label_show(struct device *dev,
298 struct device_attribute *devattr, char *buf)
299{
300 return sprintf(buf, "%s\n",
301 input_names[to_sensor_dev_attr(devattr)->index]);
302}
303
304static umode_t da9052_channel_is_visible(struct kobject *kobj,
305 struct attribute *attr, int index)
306{
307 struct device *dev = container_of(kobj, struct device, kobj);
308 struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
309 struct device_attribute *dattr = container_of(attr,
310 struct device_attribute, attr);
311 struct sensor_device_attribute *sattr = to_sensor_dev_attr(dattr);
312
313 if (!hwmon->tsi_as_adc) {
314 switch (sattr->index) {
315 case DA9052_ADC_TSI_XP:
316 case DA9052_ADC_TSI_YP:
317 case DA9052_ADC_TSI_XN:
318 case DA9052_ADC_TSI_YN:
319 return 0;
320 }
321 }
322
323 return attr->mode;
324}
325
326static SENSOR_DEVICE_ATTR_RO(in0_input, da9052_vddout, DA9052_ADC_VDDOUT);
327static SENSOR_DEVICE_ATTR_RO(in0_label, label, DA9052_ADC_VDDOUT);
328static SENSOR_DEVICE_ATTR_RO(in3_input, da9052_vbat, DA9052_ADC_VBAT);
329static SENSOR_DEVICE_ATTR_RO(in3_label, label, DA9052_ADC_VBAT);
330static SENSOR_DEVICE_ATTR_RO(in4_input, da9052_misc_channel, DA9052_ADC_IN4);
331static SENSOR_DEVICE_ATTR_RO(in4_label, label, DA9052_ADC_IN4);
332static SENSOR_DEVICE_ATTR_RO(in5_input, da9052_misc_channel, DA9052_ADC_IN5);
333static SENSOR_DEVICE_ATTR_RO(in5_label, label, DA9052_ADC_IN5);
334static SENSOR_DEVICE_ATTR_RO(in6_input, da9052_misc_channel, DA9052_ADC_IN6);
335static SENSOR_DEVICE_ATTR_RO(in6_label, label, DA9052_ADC_IN6);
336static SENSOR_DEVICE_ATTR_RO(in9_input, da9052_vbbat, DA9052_ADC_VBBAT);
337static SENSOR_DEVICE_ATTR_RO(in9_label, label, DA9052_ADC_VBBAT);
338
339static SENSOR_DEVICE_ATTR_RO(in70_input, da9052_tsi, DA9052_ADC_TSI_XP);
340static SENSOR_DEVICE_ATTR_RO(in70_label, label, DA9052_ADC_TSI_XP);
341static SENSOR_DEVICE_ATTR_RO(in71_input, da9052_tsi, DA9052_ADC_TSI_XN);
342static SENSOR_DEVICE_ATTR_RO(in71_label, label, DA9052_ADC_TSI_XN);
343static SENSOR_DEVICE_ATTR_RO(in72_input, da9052_tsi, DA9052_ADC_TSI_YP);
344static SENSOR_DEVICE_ATTR_RO(in72_label, label, DA9052_ADC_TSI_YP);
345static SENSOR_DEVICE_ATTR_RO(in73_input, da9052_tsi, DA9052_ADC_TSI_YN);
346static SENSOR_DEVICE_ATTR_RO(in73_label, label, DA9052_ADC_TSI_YN);
347
348static SENSOR_DEVICE_ATTR_RO(curr1_input, da9052_ich, DA9052_ADC_ICH);
349static SENSOR_DEVICE_ATTR_RO(curr1_label, label, DA9052_ADC_ICH);
350
351static SENSOR_DEVICE_ATTR_RO(temp2_input, da9052_tbat, DA9052_ADC_TBAT);
352static SENSOR_DEVICE_ATTR_RO(temp2_label, label, DA9052_ADC_TBAT);
353static SENSOR_DEVICE_ATTR_RO(temp8_input, da9052_tjunc, DA9052_ADC_TJUNC);
354static SENSOR_DEVICE_ATTR_RO(temp8_label, label, DA9052_ADC_TJUNC);
355
356static struct attribute *da9052_attrs[] = {
357 &sensor_dev_attr_in0_input.dev_attr.attr,
358 &sensor_dev_attr_in0_label.dev_attr.attr,
359 &sensor_dev_attr_in3_input.dev_attr.attr,
360 &sensor_dev_attr_in3_label.dev_attr.attr,
361 &sensor_dev_attr_in4_input.dev_attr.attr,
362 &sensor_dev_attr_in4_label.dev_attr.attr,
363 &sensor_dev_attr_in5_input.dev_attr.attr,
364 &sensor_dev_attr_in5_label.dev_attr.attr,
365 &sensor_dev_attr_in6_input.dev_attr.attr,
366 &sensor_dev_attr_in6_label.dev_attr.attr,
367 &sensor_dev_attr_in70_input.dev_attr.attr,
368 &sensor_dev_attr_in70_label.dev_attr.attr,
369 &sensor_dev_attr_in71_input.dev_attr.attr,
370 &sensor_dev_attr_in71_label.dev_attr.attr,
371 &sensor_dev_attr_in72_input.dev_attr.attr,
372 &sensor_dev_attr_in72_label.dev_attr.attr,
373 &sensor_dev_attr_in73_input.dev_attr.attr,
374 &sensor_dev_attr_in73_label.dev_attr.attr,
375 &sensor_dev_attr_in9_input.dev_attr.attr,
376 &sensor_dev_attr_in9_label.dev_attr.attr,
377 &sensor_dev_attr_curr1_input.dev_attr.attr,
378 &sensor_dev_attr_curr1_label.dev_attr.attr,
379 &sensor_dev_attr_temp2_input.dev_attr.attr,
380 &sensor_dev_attr_temp2_label.dev_attr.attr,
381 &sensor_dev_attr_temp8_input.dev_attr.attr,
382 &sensor_dev_attr_temp8_label.dev_attr.attr,
383 NULL
384};
385
386static const struct attribute_group da9052_group = {
387 .attrs = da9052_attrs,
388 .is_visible = da9052_channel_is_visible,
389};
390__ATTRIBUTE_GROUPS(da9052);
391
392static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data)
393{
394 struct da9052_hwmon *hwmon = data;
395
396 complete(&hwmon->tsidone);
397 return IRQ_HANDLED;
398}
399
400static int da9052_hwmon_probe(struct platform_device *pdev)
401{
402 struct device *dev = &pdev->dev;
403 struct da9052_hwmon *hwmon;
404 struct device *hwmon_dev;
405 int err;
406
407 hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL);
408 if (!hwmon)
409 return -ENOMEM;
410
411 platform_set_drvdata(pdev, hwmon);
412
413 mutex_init(&hwmon->hwmon_lock);
414 hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
415
416 init_completion(&hwmon->tsidone);
417
418 hwmon->tsi_as_adc =
419 device_property_read_bool(pdev->dev.parent, "dlg,tsi-as-adc");
420
421 if (hwmon->tsi_as_adc) {
422 hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref");
423 if (IS_ERR(hwmon->tsiref)) {
424 err = PTR_ERR(hwmon->tsiref);
425 dev_err(&pdev->dev, "failed to get tsiref: %d", err);
426 return err;
427 }
428
429 err = regulator_enable(hwmon->tsiref);
430 if (err)
431 return err;
432
433 hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref);
434 if (hwmon->tsiref_mv < 0) {
435 err = hwmon->tsiref_mv;
436 goto exit_regulator;
437 }
438
439 /* convert from microvolt (DT) to millivolt (hwmon) */
440 hwmon->tsiref_mv /= 1000;
441
442 /* TSIREF limits from datasheet */
443 if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) {
444 dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d",
445 hwmon->tsiref_mv);
446 err = -ENXIO;
447 goto exit_regulator;
448 }
449
450 /* disable touchscreen features */
451 da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00);
452
453 /* Sample every 1ms */
454 da9052_reg_update(hwmon->da9052, DA9052_ADC_CONT_REG,
455 DA9052_ADCCONT_ADCMODE,
456 DA9052_ADCCONT_ADCMODE);
457
458 err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY,
459 "tsiready-irq", da9052_tsi_datardy_irq,
460 hwmon);
461 if (err) {
462 dev_err(&pdev->dev, "Failed to register TSIRDY IRQ: %d",
463 err);
464 goto exit_regulator;
465 }
466 }
467
468 hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
469 hwmon,
470 da9052_groups);
471 err = PTR_ERR_OR_ZERO(hwmon_dev);
472 if (err)
473 goto exit_irq;
474
475 return 0;
476
477exit_irq:
478 if (hwmon->tsi_as_adc)
479 da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
480exit_regulator:
481 if (hwmon->tsiref)
482 regulator_disable(hwmon->tsiref);
483
484 return err;
485}
486
487static int da9052_hwmon_remove(struct platform_device *pdev)
488{
489 struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
490
491 if (hwmon->tsi_as_adc) {
492 da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
493 regulator_disable(hwmon->tsiref);
494 }
495
496 return 0;
497}
498
499static struct platform_driver da9052_hwmon_driver = {
500 .probe = da9052_hwmon_probe,
501 .remove = da9052_hwmon_remove,
502 .driver = {
503 .name = "da9052-hwmon",
504 },
505};
506
507module_platform_driver(da9052_hwmon_driver);
508
509MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
510MODULE_DESCRIPTION("DA9052 HWMON driver");
511MODULE_LICENSE("GPL");
512MODULE_ALIAS("platform:da9052-hwmon");
513