rtc: tps80031: register as mfd sub device
[linux-2.6.git] / drivers / power / tps80031_battery_gauge.c
1 /*
2  * drivers/power/tps80031_battery_gauge.c
3  *
4  * Gas Gauge driver for TI's tps80031
5  *
6  * Copyright (c) 2011, NVIDIA Corporation.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful, but WITHOUT
14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
16  * more details.
17  *
18  * You should have received a copy of the GNU General Public License along
19  * with this program; if not, write to the Free Software Foundation, Inc.,
20  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
21  */
22 #include <linux/kernel.h>
23 #include <linux/platform_device.h>
24 #include <linux/regulator/driver.h>
25 #include <linux/err.h>
26 #include <linux/regulator/machine.h>
27 #include <linux/mutex.h>
28
29 #include <linux/module.h>
30 #include <linux/param.h>
31 #include <linux/jiffies.h>
32 #include <linux/workqueue.h>
33 #include <linux/pm.h>
34 #include <linux/i2c.h>
35 #include <linux/slab.h>
36 #include <linux/platform_device.h>
37 #include <linux/power_supply.h>
38
39 #include <linux/mfd/core.h>
40 #include <linux/mfd/tps80031.h>
41 #include <linux/tps80031-charger.h>
42
43 #define CHARGERUSB_CINLIMIT     0xee
44 #define CONTROLLER_STAT1        0xe3
45 #define LINEAR_CHARGE_STS       0xde
46 #define STS_HW_CONDITIONS       0x21
47 #define TOGGLE1                 0x90
48 #define TOGGLE1_FGS             BIT(5)
49 #define TOGGLE1_GPADCR          BIT(1)
50 #define GPCH0_LSB               0x3b
51 #define GPCH0_MSB               0x3c
52 #define GPCH0_MSB_COLLISION_GP  BIT(4)
53 #define GPSELECT_ISB            0x35
54 #define GPADC_CTRL              0x2e
55 #define MISC1                   0xe4
56 #define CTRL_P1                 0x36
57 #define CTRL_P1_SP1             BIT(3)
58 #define CTRL_P1_EOCRT           BIT(2)
59 #define CTRL_P1_EOCP1           BIT(1)
60 #define CTRL_P1_BUSY            BIT(0)
61 #define FG_REG_00               0xc0
62 #define FG_REG_00_CC_CAL_EN     BIT(1)
63 #define FG_REG_00_CC_AUTOCLEAR  BIT(2)
64 #define FG_REG_01               0xc1    /* CONV_NR (unsigned) 0 - 7 */
65 #define FG_REG_02               0xc2    /* CONV_NR (unsigned) 8 - 15 */
66 #define FG_REG_03               0xc3    /* CONV_NR (unsigned) 16 - 23 */
67 #define FG_REG_04               0xc4    /* ACCM (signed) 0 - 7 */
68 #define FG_REG_05               0xc5    /* ACCM (signed) 8 - 15 */
69 #define FG_REG_06               0xc6    /* ACCM (signed) 16 - 23 */
70 #define FG_REG_07               0xc7    /* ACCM (signed) 24 - 31 */
71 #define FG_REG_08               0xc8    /* OFFSET (signed) 0 - 7 */
72 #define FG_REG_09               0xc9    /* OFFSET (signed) 8 - 9 */
73 #define FG_REG_10               0xca    /* LAST_READ (signed) 0 - 7 */
74 #define FG_REG_11               0xcb    /* LAST_READ (signed) 8 - 13 */
75
76 #define TPS80031_VBUS_DET       BIT(2)
77 #define TPS80031_VAC_DET        BIT(3)
78 #define TPS80031_STS_VYSMIN_HI  BIT(4)
79 #define END_OF_CHARGE           BIT(5)
80
81 #define DRIVER_VERSION          "1.1.0"
82 #define BATTERY_POLL_PERIOD     30000
83
84 static int tps80031_temp_table[] = {
85         /* adc code for temperature in degree C */
86         929, 925, /* -2, -1 */
87         920, 917, 912, 908, 904, 899, 895, 890, 885, 880, /* 00 - 09 */
88         875, 869, 864, 858, 853, 847, 841, 835, 829, 823, /* 10 - 19 */
89         816, 810, 804, 797, 790, 783, 776, 769, 762, 755, /* 20 - 29 */
90         748, 740, 732, 725, 718, 710, 703, 695, 687, 679, /* 30 - 39 */
91         671, 663, 655, 647, 639, 631, 623, 615, 607, 599, /* 40 - 49 */
92         591, 583, 575, 567, 559, 551, 543, 535, 527, 519, /* 50 - 59 */
93         511, 504, 496 /* 60 - 62 */
94 };
95
96 struct tps80031_device_info {
97         struct device           *dev;
98         struct i2c_client       *client;
99         struct power_supply     bat;
100         struct power_supply     ac;
101         struct power_supply     usb;
102         struct timer_list       battery_poll_timer;
103         uint32_t vsys;
104         uint8_t usb_online;
105         uint8_t ac_online;
106         uint8_t usb_status;
107         uint8_t capacity_sts;
108         uint8_t health;
109         uint8_t sys_vlow_intr;
110         uint8_t fg_calib_intr;
111         int16_t fg_offset;
112         struct mutex adc_lock;
113 };
114
115 static enum power_supply_property tps80031_bat_props[] = {
116         POWER_SUPPLY_PROP_TECHNOLOGY,
117         POWER_SUPPLY_PROP_VOLTAGE_NOW,
118         POWER_SUPPLY_PROP_TEMP,
119         POWER_SUPPLY_PROP_CAPACITY,
120         POWER_SUPPLY_PROP_HEALTH,
121         POWER_SUPPLY_PROP_STATUS,
122         POWER_SUPPLY_PROP_CHARGE_NOW,
123         POWER_SUPPLY_PROP_CHARGE_COUNTER,
124 };
125
126 static enum power_supply_property tps80031_usb_props[] = {
127         POWER_SUPPLY_PROP_ONLINE,
128 };
129
130 static enum power_supply_property tps80031_ac_props[] = {
131         POWER_SUPPLY_PROP_ONLINE,
132 };
133
134 static int tps80031_reg_read(struct tps80031_device_info *di, int sid, int reg,
135                                         uint8_t *val)
136 {
137         int ret;
138
139         ret = tps80031_read(di->dev->parent, sid, reg, val);
140         if (ret < 0)
141                 dev_err(di->dev, "Failed read register 0x%02x\n",
142                                         reg);
143         return ret;
144 }
145
146 static int tps80031_reg_write(struct tps80031_device_info *di, int sid, int reg,
147                                         uint8_t val)
148 {
149         int ret;
150
151         ret = tps80031_write(di->dev->parent, sid, reg, val);
152         if (ret < 0)
153                 dev_err(di->dev, "Failed write register 0x%02x\n",
154                                         reg);
155         return ret;
156 }
157
158 static int tps80031_battery_capacity(struct tps80031_device_info *di,
159                         union power_supply_propval *val)
160 {
161         uint8_t hwsts;
162         int ret;
163
164         ret = tps80031_reg_read(di, SLAVE_ID2, LINEAR_CHARGE_STS, &hwsts);
165         if (ret < 0)
166                 return ret;
167
168         di->capacity_sts = di->vsys;
169         if (hwsts & END_OF_CHARGE)
170                 di->capacity_sts = 100;
171
172         if (di->sys_vlow_intr) {
173                 di->capacity_sts = 10;
174                 di->sys_vlow_intr = 0;
175         }
176
177         if (di->capacity_sts <= 10)
178                 di->health = POWER_SUPPLY_HEALTH_DEAD;
179         else
180                 di->health = POWER_SUPPLY_HEALTH_GOOD;
181
182         return  di->capacity_sts;
183 }
184
185 static int tps80031_battery_voltage(struct tps80031_device_info *di,
186                         union power_supply_propval *val)
187 {
188         int voltage;
189
190         voltage = tps80031_gpadc_conversion(SYSTEM_SUPPLY);
191         if (voltage < 0)
192                 return voltage;
193         voltage = ((voltage * 1000) / 4) * 5;
194
195         if (voltage < 3700000)
196                 di->vsys = 10;
197         else if (voltage > 3700000 && voltage <= 3800000)
198                 di->vsys = 20;
199         else if (voltage > 3800000 && voltage <= 3900000)
200                 di->vsys = 50;
201         else if (voltage > 3900000 && voltage <= 4000000)
202                 di->vsys = 75;
203         else if (voltage >= 4000000)
204                 di->vsys = 90;
205
206         return voltage;
207 }
208
209 static int tps80031_battery_charge_now(struct tps80031_device_info *di,
210                         union power_supply_propval *val)
211 {
212         int charge;
213
214         charge = tps80031_gpadc_conversion(BATTERY_CHARGING_CURRENT);
215         if (charge < 0)
216                 return charge;
217         charge = charge * 78125 / 40;
218
219         return charge;
220 }
221
222 static int tps80031_battery_charge_counter(struct tps80031_device_info *di,
223                         union power_supply_propval *val)
224 {
225         int retval, ret;
226         uint32_t cnt_byte;
227         uint32_t acc_byte;
228
229         /* check if calibrated */
230         if (di->fg_calib_intr == 0)
231                 return 0;
232
233         /* get current accumlator */
234         ret = tps80031_reads(di->dev->parent, SLAVE_ID2, FG_REG_04, 4,
235                                                         (uint8_t *) &acc_byte);
236         if (ret < 0)
237                 return ret;
238         /* counter value is mAs, need report uAh */
239         retval = (int32_t) acc_byte / 18 * 5;
240
241         /* get counter */
242         ret = tps80031_reads(di->dev->parent, SLAVE_ID2, FG_REG_01, 3,
243                                                         (uint8_t *) &cnt_byte);
244         if (ret < 0)
245                 return ret;
246         /* we need calibrate the offset current in uAh*/
247         retval = retval - (di->fg_offset / 4 * cnt_byte);
248
249         /* @todo, counter value will overflow if battery get continuously
250          * charged discharged for more than 108Ah using 250mS integration
251          * period althrough it is hightly impossible.
252          */
253
254         return retval;
255 }
256
257 static int tps80031_battery_temp(struct tps80031_device_info *di,
258                                         union power_supply_propval *val)
259 {
260         int adc_code, temp;
261
262         adc_code = tps80031_gpadc_conversion(BATTERY_TEMPERATURE);
263         if (adc_code < 0)
264                 return adc_code;
265
266         for (temp = 0; temp < ARRAY_SIZE(tps80031_temp_table); temp++) {
267                 if (adc_code >= tps80031_temp_table[temp])
268                         break;
269         }
270         /* first 2 values are for negative temperature */
271         val->intval = (temp - 2) * 10; /* in tenths of degree Celsius */
272
273         return  val->intval;
274 }
275
276 #define to_tps80031_device_info_bat(x) container_of((x), \
277                                 struct tps80031_device_info, bat);
278
279 static int tps80031_bat_get_property(struct power_supply *psy,
280         enum power_supply_property psp, union power_supply_propval *val)
281 {
282         struct tps80031_device_info *di = to_tps80031_device_info_bat(psy);
283
284         switch (psp) {
285
286         case POWER_SUPPLY_PROP_TECHNOLOGY:
287                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
288                 break;
289
290         case POWER_SUPPLY_PROP_HEALTH:
291                 val->intval = di->health;
292                 break;
293
294         case POWER_SUPPLY_PROP_CAPACITY:
295                 val->intval =  tps80031_battery_capacity(di, val);
296                 break;
297
298         case POWER_SUPPLY_PROP_CHARGE_NOW:
299                 val->intval =  tps80031_battery_charge_now(di, val);
300                 break;
301
302         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
303                 val->intval =  tps80031_battery_voltage(di, val);
304                 break;
305
306         case POWER_SUPPLY_PROP_CHARGE_COUNTER:
307                 val->intval =  tps80031_battery_charge_counter(di, val);
308                 break;
309
310         case POWER_SUPPLY_PROP_STATUS:
311                 val->intval = di->usb_status;
312                 break;
313
314         case POWER_SUPPLY_PROP_TEMP:
315                 val->intval = tps80031_battery_temp(di, val);
316                 break;
317
318         default:
319                 return -EINVAL;
320         }
321         return 0;
322 }
323
324 #define to_tps80031_device_info_usb(x) container_of((x), \
325                                 struct tps80031_device_info, usb);
326
327 static int tps80031_usb_get_property(struct power_supply *psy,
328                 enum power_supply_property psp, union power_supply_propval *val)
329 {
330         struct tps80031_device_info *di = to_tps80031_device_info_usb(psy);
331
332         switch (psp) {
333         case POWER_SUPPLY_PROP_ONLINE:
334                 val->intval = di->usb_online;
335                 break;
336         default:
337                 return -EINVAL;
338         }
339         return 0;
340 }
341
342 #define to_tps80031_device_info_ac(x) container_of((x), \
343                                 struct tps80031_device_info, ac);
344
345 static int tps80031_ac_get_property(struct power_supply *psy,
346                 enum power_supply_property psp, union power_supply_propval *val)
347 {
348         struct tps80031_device_info *di = to_tps80031_device_info_ac(psy);
349
350         switch (psp) {
351         case POWER_SUPPLY_PROP_ONLINE:
352                 val->intval = di->ac_online;
353                 break;
354         default:
355                 return -EINVAL;
356         }
357         return 0;
358 }
359
360 static irqreturn_t tps80031_sys_vlow(int irq, void *data)
361 {
362         struct tps80031_device_info *di = data;
363
364         di->sys_vlow_intr = 1;
365         power_supply_changed(&di->bat);
366         return IRQ_HANDLED;
367 }
368
369 static irqreturn_t tps80031_fg_calibrated(int irq, void *data)
370 {
371         struct tps80031_device_info *di = data;
372         uint8_t acc_byte0;
373         uint8_t acc_byte1;
374         int ret;
375
376         ret = tps80031_reg_read(di, SLAVE_ID2, FG_REG_08, &acc_byte0);
377         if (ret < 0)
378                 return IRQ_HANDLED;
379         ret = tps80031_reg_read(di, SLAVE_ID2, FG_REG_09, &acc_byte1);
380         if (ret < 0)
381                 return IRQ_HANDLED;
382         /* sign extension */
383         if (acc_byte1 & 0x02)
384                 acc_byte1 = acc_byte1 | 0xFC;
385         else
386                 acc_byte1 = acc_byte1 & 0x03;
387
388         di->fg_offset = (int16_t) ((acc_byte1 << 8) | acc_byte0);
389         /* fuel gauge auto calibration finished */
390         di->fg_calib_intr = 1;
391         return IRQ_HANDLED;
392 }
393
394 static int tps80031_fg_start_gas_gauge(struct tps80031_device_info *di)
395 {
396         int ret = 0;
397         di->fg_calib_intr = 0;
398
399         /* start gas gauge */
400         ret = tps80031_reg_write(di, SLAVE_ID2, TOGGLE1, 0x20);
401         if (ret < 0)
402                 return ret;
403         /* set ADC update time to 3.9ms and start calibration */
404         ret = tps80031_reg_write(di, SLAVE_ID2, FG_REG_00, FG_REG_00_CC_CAL_EN);
405         if (ret < 0)
406                 return ret;
407         return ret;
408 }
409
410 void tps80031_battery_status(enum charging_states status, void *data)
411 {
412         struct tps80031_device_info *di = data;
413         int ret;
414         uint8_t retval;
415
416         if ((status == charging_state_charging_in_progress)) {
417                 di->usb_status  = POWER_SUPPLY_STATUS_CHARGING;
418                 di->health      = POWER_SUPPLY_HEALTH_GOOD;
419                 ret = tps80031_reg_read(di, SLAVE_ID2,
420                                 CHARGERUSB_CINLIMIT, &retval);
421                 if (ret < 0) {
422                         di->ac_online = 0;
423                         di->usb_online = 0;
424                 }
425                 if (retval == 0x9) {
426                         di->ac_online = 0;
427                         di->usb_online = 1;
428                 } else {
429                         di->usb_online = 0;
430                         di->ac_online = 1;
431                 }
432         } else if (status == charging_state_charging_stopped) {
433                 di->usb_status = POWER_SUPPLY_STATUS_DISCHARGING;
434                 di->ac_online = 0;
435                 di->usb_online = 0;
436         }
437         power_supply_changed(&di->usb);
438         power_supply_changed(&di->bat);
439         power_supply_changed(&di->ac);
440 }
441
442 static void battery_poll_timer_func(unsigned long pdi)
443 {
444         struct tps80031_device_info *di = (void *)pdi;
445         power_supply_changed(&di->bat);
446         mod_timer(&di->battery_poll_timer,
447                 jiffies + msecs_to_jiffies(BATTERY_POLL_PERIOD));
448 }
449
450 static int tps80031_battery_probe(struct platform_device *pdev)
451 {
452         int ret;
453         uint8_t retval;
454         struct device *dev = &pdev->dev;
455         struct tps80031_device_info *di;
456         struct tps80031_bg_platform_data *pdata = pdev->dev.platform_data;
457
458         di = devm_kzalloc(&pdev->dev, sizeof *di, GFP_KERNEL);
459         if (!di) {
460                 dev_err(dev->parent, "failed to allocate device info data\n");
461                 return -ENOMEM;
462         }
463
464         if (!pdata->battery_present) {
465                 dev_err(dev, "%s() No battery detected, exiting..\n",
466                                 __func__);
467                 return -ENODEV;
468         }
469
470         di->dev =  &pdev->dev;
471
472         ret = tps80031_reg_read(di, SLAVE_ID2, CONTROLLER_STAT1, &retval);
473         if (ret < 0)
474                 return ret;
475
476         if ((retval & TPS80031_VAC_DET) | (retval & TPS80031_VBUS_DET)) {
477                 di->usb_status = POWER_SUPPLY_STATUS_CHARGING;
478                 di->usb_online = 1;
479         } else {
480                 di->usb_status = POWER_SUPPLY_STATUS_DISCHARGING;
481                 di->usb_online = 0;
482         }
483
484         di->capacity_sts = 50;
485         di->health = POWER_SUPPLY_HEALTH_GOOD;
486
487         di->bat.name            = "tps80031-bat";
488         di->bat.type            = POWER_SUPPLY_TYPE_BATTERY;
489         di->bat.properties      = tps80031_bat_props;
490         di->bat.num_properties  = ARRAY_SIZE(tps80031_bat_props);
491         di->bat.get_property    = tps80031_bat_get_property;
492
493         ret = power_supply_register(dev->parent, &di->bat);
494         if (ret) {
495                 dev_err(dev->parent, "failed to register bat power supply\n");
496                 return ret;
497         }
498
499         di->usb.name            = "tps80031-usb";
500         di->usb.type            = POWER_SUPPLY_TYPE_USB;
501         di->usb.properties      = tps80031_usb_props;
502         di->usb.num_properties  = ARRAY_SIZE(tps80031_usb_props);
503         di->usb.get_property    = tps80031_usb_get_property;
504
505         ret = power_supply_register(dev->parent, &di->usb);
506         if (ret) {
507                 dev_err(dev->parent, "failed to register ac power supply\n");
508                 goto power_supply_fail2;
509         }
510
511         di->ac.name             = "tps80031-ac";
512         di->ac.type             = POWER_SUPPLY_TYPE_MAINS;
513         di->ac.properties       = tps80031_ac_props;
514         di->ac.num_properties   = ARRAY_SIZE(tps80031_ac_props);
515         di->ac.get_property     = tps80031_ac_get_property;
516
517         ret = power_supply_register(dev->parent, &di->ac);
518         if (ret) {
519                 dev_err(dev->parent, "failed to register ac power supply\n");
520                 goto power_supply_fail1;
521         }
522
523         dev_set_drvdata(&pdev->dev, di);
524
525         ret = register_charging_state_callback(tps80031_battery_status, di);
526         if (ret < 0)
527                 goto power_supply_fail0;
528
529         ret = request_threaded_irq(pdata->irq_base + TPS80031_INT_SYS_VLOW,
530                                 NULL, tps80031_sys_vlow,
531                                         IRQF_ONESHOT, "tps80031_sys_vlow", di);
532         if (ret < 0) {
533                 dev_err(dev->parent, "request IRQ %d fail\n", pdata->irq_base);
534                 goto power_supply_fail0;
535         }
536
537         ret = request_threaded_irq(pdata->irq_base + TPS80031_INT_CC_AUTOCAL,
538                                 NULL, tps80031_fg_calibrated, IRQF_ONESHOT,
539                                 "tps80031_fuel_gauge_calibration", di);
540         if (ret < 0) {
541                 dev_err(dev->parent, "request IRQ %d fail\n", pdata->irq_base);
542                 goto irq_fail2;
543         }
544         setup_timer(&di->battery_poll_timer,
545                 battery_poll_timer_func, (unsigned long) di);
546         mod_timer(&di->battery_poll_timer,
547                 jiffies + msecs_to_jiffies(BATTERY_POLL_PERIOD));
548
549         ret = tps80031_fg_start_gas_gauge(di);
550         if (ret < 0) {
551                 dev_err(dev->parent, "failed to start fuel-gauge\n");
552                 goto irq_fail1;
553         }
554         dev_info(dev->parent, "support ver. %s enabled\n", DRIVER_VERSION);
555
556         return ret;
557
558 irq_fail1:
559         free_irq(pdata->irq_base + TPS80031_INT_CC_AUTOCAL, di);
560 irq_fail2:
561         free_irq(pdata->irq_base + TPS80031_INT_SYS_VLOW, di);
562 power_supply_fail0:
563         power_supply_unregister(&di->ac);
564 power_supply_fail1:
565         power_supply_unregister(&di->usb);
566 power_supply_fail2:
567         power_supply_unregister(&di->bat);
568         return ret;
569 }
570
571 static int tps80031_battery_remove(struct platform_device *pdev)
572 {
573         struct tps80031_device_info *di = dev_get_drvdata(&pdev->dev);
574
575         power_supply_unregister(&di->bat);
576         power_supply_unregister(&di->usb);
577         power_supply_unregister(&di->ac);
578
579         return 0;
580 }
581
582 static struct platform_driver tps80031_battery_driver = {
583         .driver = {
584                 .name   = "tps80031-battery-gauge",
585                 .owner  = THIS_MODULE,
586         },
587         .probe  = tps80031_battery_probe,
588         .remove = tps80031_battery_remove,
589 };
590
591 static int __init tps80031_battery_init(void)
592 {
593         return platform_driver_register(&tps80031_battery_driver);
594 }
595
596 static void __exit tps80031_battery_exit(void)
597 {
598         platform_driver_unregister(&tps80031_battery_driver);
599 }
600
601 module_init(tps80031_battery_init);
602 module_exit(tps80031_battery_exit);
603
604 MODULE_LICENSE("GPL");
605 MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com> ");
606 MODULE_DESCRIPTION("tps80031 battery gauge driver");