Merge tag 'staging-4.16-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[linux-2.6-microblaze.git] / drivers / hwmon / da9052-hwmon.c
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
29 struct 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
38 static 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 */
55 static 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 */
61 static inline int input_reg_to_mv(int value)
62 {
63         return DIV_ROUND_CLOSEST(value * 2500, 1023);
64 }
65
66 /* Conversion function for VBBAT */
67 static inline int vbbat_reg_to_mv(int value)
68 {
69         return DIV_ROUND_CLOSEST(value * 5000, 1023);
70 }
71
72 static 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
77 static 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
84 static 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
90 static ssize_t da9052_read_vddout(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
115 hwmon_err_release:
116         da9052_disable_vddout_channel(hwmon->da9052);
117 hwmon_err:
118         mutex_unlock(&hwmon->hwmon_lock);
119         return ret;
120 }
121
122 static ssize_t da9052_read_ich(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
136 static ssize_t da9052_read_tbat(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
144 static ssize_t da9052_read_vbat(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
157 static ssize_t da9052_read_misc_channel(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
172 static 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
194 static 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
226 static 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
245 static ssize_t da9052_read_tsi(struct device *dev,
246                                struct device_attribute *devattr,
247                                char *buf)
248 {
249         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
250         int channel = to_sensor_dev_attr(devattr)->index;
251         int ret;
252
253         mutex_lock(&hwmon->hwmon_lock);
254         ret = __da9052_read_tsi(dev, channel);
255         mutex_unlock(&hwmon->hwmon_lock);
256
257         if (ret < 0)
258                 return ret;
259         else
260                 return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret));
261 }
262
263 static ssize_t da9052_read_tjunc(struct device *dev,
264                                  struct device_attribute *devattr, char *buf)
265 {
266         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
267         int tjunc;
268         int toffset;
269
270         tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
271         if (tjunc < 0)
272                 return tjunc;
273
274         toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
275         if (toffset < 0)
276                 return toffset;
277
278         /*
279          * Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
280          * T_OFFSET is a trim value used to improve accuracy of the result
281          */
282         return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800);
283 }
284
285 static ssize_t da9052_read_vbbat(struct device *dev,
286                                  struct device_attribute *devattr, char *buf)
287 {
288         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
289         int ret;
290
291         ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
292         if (ret < 0)
293                 return ret;
294
295         return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret));
296 }
297
298 static ssize_t show_label(struct device *dev,
299                           struct device_attribute *devattr, char *buf)
300 {
301         return sprintf(buf, "%s\n",
302                        input_names[to_sensor_dev_attr(devattr)->index]);
303 }
304
305 static umode_t da9052_channel_is_visible(struct kobject *kobj,
306                                          struct attribute *attr, int index)
307 {
308         struct device *dev = container_of(kobj, struct device, kobj);
309         struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
310         struct device_attribute *dattr = container_of(attr,
311                                 struct device_attribute, attr);
312         struct sensor_device_attribute *sattr = to_sensor_dev_attr(dattr);
313
314         if (!hwmon->tsi_as_adc) {
315                 switch (sattr->index) {
316                 case DA9052_ADC_TSI_XP:
317                 case DA9052_ADC_TSI_YP:
318                 case DA9052_ADC_TSI_XN:
319                 case DA9052_ADC_TSI_YN:
320                         return 0;
321                 }
322         }
323
324         return attr->mode;
325 }
326
327 static SENSOR_DEVICE_ATTR(in0_input, 0444, da9052_read_vddout, NULL,
328                           DA9052_ADC_VDDOUT);
329 static SENSOR_DEVICE_ATTR(in0_label, 0444, show_label, NULL,
330                           DA9052_ADC_VDDOUT);
331 static SENSOR_DEVICE_ATTR(in3_input, 0444, da9052_read_vbat, NULL,
332                           DA9052_ADC_VBAT);
333 static SENSOR_DEVICE_ATTR(in3_label, 0444, show_label, NULL,
334                           DA9052_ADC_VBAT);
335 static SENSOR_DEVICE_ATTR(in4_input, 0444, da9052_read_misc_channel, NULL,
336                           DA9052_ADC_IN4);
337 static SENSOR_DEVICE_ATTR(in4_label, 0444, show_label, NULL,
338                           DA9052_ADC_IN4);
339 static SENSOR_DEVICE_ATTR(in5_input, 0444, da9052_read_misc_channel, NULL,
340                           DA9052_ADC_IN5);
341 static SENSOR_DEVICE_ATTR(in5_label, 0444, show_label, NULL,
342                           DA9052_ADC_IN5);
343 static SENSOR_DEVICE_ATTR(in6_input, 0444, da9052_read_misc_channel, NULL,
344                           DA9052_ADC_IN6);
345 static SENSOR_DEVICE_ATTR(in6_label, 0444, show_label, NULL,
346                           DA9052_ADC_IN6);
347 static SENSOR_DEVICE_ATTR(in9_input, 0444, da9052_read_vbbat, NULL,
348                           DA9052_ADC_VBBAT);
349 static SENSOR_DEVICE_ATTR(in9_label, 0444, show_label, NULL,
350                           DA9052_ADC_VBBAT);
351
352 static SENSOR_DEVICE_ATTR(in70_input, 0444, da9052_read_tsi, NULL,
353                           DA9052_ADC_TSI_XP);
354 static SENSOR_DEVICE_ATTR(in70_label, 0444, show_label, NULL,
355                           DA9052_ADC_TSI_XP);
356 static SENSOR_DEVICE_ATTR(in71_input, 0444, da9052_read_tsi, NULL,
357                           DA9052_ADC_TSI_XN);
358 static SENSOR_DEVICE_ATTR(in71_label, 0444, show_label, NULL,
359                           DA9052_ADC_TSI_XN);
360 static SENSOR_DEVICE_ATTR(in72_input, 0444, da9052_read_tsi, NULL,
361                           DA9052_ADC_TSI_YP);
362 static SENSOR_DEVICE_ATTR(in72_label, 0444, show_label, NULL,
363                           DA9052_ADC_TSI_YP);
364 static SENSOR_DEVICE_ATTR(in73_input, 0444, da9052_read_tsi, NULL,
365                           DA9052_ADC_TSI_YN);
366 static SENSOR_DEVICE_ATTR(in73_label, 0444, show_label, NULL,
367                           DA9052_ADC_TSI_YN);
368
369 static SENSOR_DEVICE_ATTR(curr1_input, 0444, da9052_read_ich, NULL,
370                           DA9052_ADC_ICH);
371 static SENSOR_DEVICE_ATTR(curr1_label, 0444, show_label, NULL,
372                           DA9052_ADC_ICH);
373
374 static SENSOR_DEVICE_ATTR(temp2_input, 0444, da9052_read_tbat, NULL,
375                           DA9052_ADC_TBAT);
376 static SENSOR_DEVICE_ATTR(temp2_label, 0444, show_label, NULL,
377                           DA9052_ADC_TBAT);
378 static SENSOR_DEVICE_ATTR(temp8_input, 0444, da9052_read_tjunc, NULL,
379                           DA9052_ADC_TJUNC);
380 static SENSOR_DEVICE_ATTR(temp8_label, 0444, show_label, NULL,
381                           DA9052_ADC_TJUNC);
382
383 static struct attribute *da9052_attrs[] = {
384         &sensor_dev_attr_in0_input.dev_attr.attr,
385         &sensor_dev_attr_in0_label.dev_attr.attr,
386         &sensor_dev_attr_in3_input.dev_attr.attr,
387         &sensor_dev_attr_in3_label.dev_attr.attr,
388         &sensor_dev_attr_in4_input.dev_attr.attr,
389         &sensor_dev_attr_in4_label.dev_attr.attr,
390         &sensor_dev_attr_in5_input.dev_attr.attr,
391         &sensor_dev_attr_in5_label.dev_attr.attr,
392         &sensor_dev_attr_in6_input.dev_attr.attr,
393         &sensor_dev_attr_in6_label.dev_attr.attr,
394         &sensor_dev_attr_in70_input.dev_attr.attr,
395         &sensor_dev_attr_in70_label.dev_attr.attr,
396         &sensor_dev_attr_in71_input.dev_attr.attr,
397         &sensor_dev_attr_in71_label.dev_attr.attr,
398         &sensor_dev_attr_in72_input.dev_attr.attr,
399         &sensor_dev_attr_in72_label.dev_attr.attr,
400         &sensor_dev_attr_in73_input.dev_attr.attr,
401         &sensor_dev_attr_in73_label.dev_attr.attr,
402         &sensor_dev_attr_in9_input.dev_attr.attr,
403         &sensor_dev_attr_in9_label.dev_attr.attr,
404         &sensor_dev_attr_curr1_input.dev_attr.attr,
405         &sensor_dev_attr_curr1_label.dev_attr.attr,
406         &sensor_dev_attr_temp2_input.dev_attr.attr,
407         &sensor_dev_attr_temp2_label.dev_attr.attr,
408         &sensor_dev_attr_temp8_input.dev_attr.attr,
409         &sensor_dev_attr_temp8_label.dev_attr.attr,
410         NULL
411 };
412
413 static const struct attribute_group da9052_group = {
414         .attrs = da9052_attrs,
415         .is_visible = da9052_channel_is_visible,
416 };
417 __ATTRIBUTE_GROUPS(da9052);
418
419 static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data)
420 {
421         struct da9052_hwmon *hwmon = data;
422
423         complete(&hwmon->tsidone);
424         return IRQ_HANDLED;
425 }
426
427 static int da9052_hwmon_probe(struct platform_device *pdev)
428 {
429         struct device *dev = &pdev->dev;
430         struct da9052_hwmon *hwmon;
431         struct device *hwmon_dev;
432         int err;
433
434         hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL);
435         if (!hwmon)
436                 return -ENOMEM;
437
438         platform_set_drvdata(pdev, hwmon);
439
440         mutex_init(&hwmon->hwmon_lock);
441         hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
442
443         init_completion(&hwmon->tsidone);
444
445         hwmon->tsi_as_adc =
446                 device_property_read_bool(pdev->dev.parent, "dlg,tsi-as-adc");
447
448         if (hwmon->tsi_as_adc) {
449                 hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref");
450                 if (IS_ERR(hwmon->tsiref)) {
451                         err = PTR_ERR(hwmon->tsiref);
452                         dev_err(&pdev->dev, "failed to get tsiref: %d", err);
453                         return err;
454                 }
455
456                 err = regulator_enable(hwmon->tsiref);
457                 if (err)
458                         return err;
459
460                 hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref);
461                 if (hwmon->tsiref_mv < 0) {
462                         err = hwmon->tsiref_mv;
463                         goto exit_regulator;
464                 }
465
466                 /* convert from microvolt (DT) to millivolt (hwmon) */
467                 hwmon->tsiref_mv /= 1000;
468
469                 /* TSIREF limits from datasheet */
470                 if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) {
471                         dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d",
472                                 hwmon->tsiref_mv);
473                         err = -ENXIO;
474                         goto exit_regulator;
475                 }
476
477                 /* disable touchscreen features */
478                 da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00);
479
480                 /* Sample every 1ms */
481                 da9052_reg_update(hwmon->da9052, DA9052_ADC_CONT_REG,
482                                           DA9052_ADCCONT_ADCMODE,
483                                           DA9052_ADCCONT_ADCMODE);
484
485                 err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY,
486                                          "tsiready-irq", da9052_tsi_datardy_irq,
487                                          hwmon);
488                 if (err) {
489                         dev_err(&pdev->dev, "Failed to register TSIRDY IRQ: %d",
490                                 err);
491                         goto exit_regulator;
492                 }
493         }
494
495         hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
496                                                            hwmon,
497                                                            da9052_groups);
498         err = PTR_ERR_OR_ZERO(hwmon_dev);
499         if (err)
500                 goto exit_irq;
501
502         return 0;
503
504 exit_irq:
505         if (hwmon->tsi_as_adc)
506                 da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
507 exit_regulator:
508         if (hwmon->tsiref)
509                 regulator_disable(hwmon->tsiref);
510
511         return err;
512 }
513
514 static int da9052_hwmon_remove(struct platform_device *pdev)
515 {
516         struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
517
518         if (hwmon->tsi_as_adc) {
519                 da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
520                 regulator_disable(hwmon->tsiref);
521         }
522
523         return 0;
524 }
525
526 static struct platform_driver da9052_hwmon_driver = {
527         .probe = da9052_hwmon_probe,
528         .remove = da9052_hwmon_remove,
529         .driver = {
530                 .name = "da9052-hwmon",
531         },
532 };
533
534 module_platform_driver(da9052_hwmon_driver);
535
536 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
537 MODULE_DESCRIPTION("DA9052 HWMON driver");
538 MODULE_LICENSE("GPL");
539 MODULE_ALIAS("platform:da9052-hwmon");