Root/drivers/power/max17042_battery.c

1/*
2 * Fuel gauge driver for Maxim 17042 / 8966 / 8997
3 * Note that Maxim 8966 and 8997 are mfd and this is its subdevice.
4 *
5 * Copyright (C) 2011 Samsung Electronics
6 * MyungJoo Ham <myungjoo.ham@samsung.com>
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,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * This driver is based on max17040_battery.c
23 */
24
25#include <linux/init.h>
26#include <linux/module.h>
27#include <linux/slab.h>
28#include <linux/i2c.h>
29#include <linux/delay.h>
30#include <linux/interrupt.h>
31#include <linux/pm.h>
32#include <linux/mod_devicetable.h>
33#include <linux/power_supply.h>
34#include <linux/power/max17042_battery.h>
35#include <linux/of.h>
36
37/* Status register bits */
38#define STATUS_POR_BIT (1 << 1)
39#define STATUS_BST_BIT (1 << 3)
40#define STATUS_VMN_BIT (1 << 8)
41#define STATUS_TMN_BIT (1 << 9)
42#define STATUS_SMN_BIT (1 << 10)
43#define STATUS_BI_BIT (1 << 11)
44#define STATUS_VMX_BIT (1 << 12)
45#define STATUS_TMX_BIT (1 << 13)
46#define STATUS_SMX_BIT (1 << 14)
47#define STATUS_BR_BIT (1 << 15)
48
49/* Interrupt mask bits */
50#define CONFIG_ALRT_BIT_ENBL (1 << 2)
51#define STATUS_INTR_SOCMIN_BIT (1 << 10)
52#define STATUS_INTR_SOCMAX_BIT (1 << 14)
53
54#define VFSOC0_LOCK 0x0000
55#define VFSOC0_UNLOCK 0x0080
56#define MODEL_UNLOCK1 0X0059
57#define MODEL_UNLOCK2 0X00C4
58#define MODEL_LOCK1 0X0000
59#define MODEL_LOCK2 0X0000
60
61#define dQ_ACC_DIV 0x4
62#define dP_ACC_100 0x1900
63#define dP_ACC_200 0x3200
64
65#define MAX17042_IC_VERSION 0x0092
66#define MAX17047_IC_VERSION 0x00AC /* same for max17050 */
67
68struct max17042_chip {
69    struct i2c_client *client;
70    struct power_supply battery;
71    enum max170xx_chip_type chip_type;
72    struct max17042_platform_data *pdata;
73    struct work_struct work;
74    int init_complete;
75};
76
77static int max17042_write_reg(struct i2c_client *client, u8 reg, u16 value)
78{
79    int ret = i2c_smbus_write_word_data(client, reg, value);
80
81    if (ret < 0)
82        dev_err(&client->dev, "%s: err %d\n", __func__, ret);
83
84    return ret;
85}
86
87static int max17042_read_reg(struct i2c_client *client, u8 reg)
88{
89    int ret = i2c_smbus_read_word_data(client, reg);
90
91    if (ret < 0)
92        dev_err(&client->dev, "%s: err %d\n", __func__, ret);
93
94    return ret;
95}
96
97static void max17042_set_reg(struct i2c_client *client,
98                 struct max17042_reg_data *data, int size)
99{
100    int i;
101
102    for (i = 0; i < size; i++)
103        max17042_write_reg(client, data[i].addr, data[i].data);
104}
105
106static enum power_supply_property max17042_battery_props[] = {
107    POWER_SUPPLY_PROP_PRESENT,
108    POWER_SUPPLY_PROP_CYCLE_COUNT,
109    POWER_SUPPLY_PROP_VOLTAGE_MAX,
110    POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
111    POWER_SUPPLY_PROP_VOLTAGE_NOW,
112    POWER_SUPPLY_PROP_VOLTAGE_AVG,
113    POWER_SUPPLY_PROP_VOLTAGE_OCV,
114    POWER_SUPPLY_PROP_CAPACITY,
115    POWER_SUPPLY_PROP_CHARGE_FULL,
116    POWER_SUPPLY_PROP_CHARGE_COUNTER,
117    POWER_SUPPLY_PROP_TEMP,
118    POWER_SUPPLY_PROP_CURRENT_NOW,
119    POWER_SUPPLY_PROP_CURRENT_AVG,
120};
121
122static int max17042_get_property(struct power_supply *psy,
123                enum power_supply_property psp,
124                union power_supply_propval *val)
125{
126    struct max17042_chip *chip = container_of(psy,
127                struct max17042_chip, battery);
128    int ret;
129
130    if (!chip->init_complete)
131        return -EAGAIN;
132
133    switch (psp) {
134    case POWER_SUPPLY_PROP_PRESENT:
135        ret = max17042_read_reg(chip->client, MAX17042_STATUS);
136        if (ret < 0)
137            return ret;
138
139        if (ret & MAX17042_STATUS_BattAbsent)
140            val->intval = 0;
141        else
142            val->intval = 1;
143        break;
144    case POWER_SUPPLY_PROP_CYCLE_COUNT:
145        ret = max17042_read_reg(chip->client, MAX17042_Cycles);
146        if (ret < 0)
147            return ret;
148
149        val->intval = ret;
150        break;
151    case POWER_SUPPLY_PROP_VOLTAGE_MAX:
152        ret = max17042_read_reg(chip->client, MAX17042_MinMaxVolt);
153        if (ret < 0)
154            return ret;
155
156        val->intval = ret >> 8;
157        val->intval *= 20000; /* Units of LSB = 20mV */
158        break;
159    case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
160        if (chip->chip_type == MAX17042)
161            ret = max17042_read_reg(chip->client, MAX17042_V_empty);
162        else
163            ret = max17042_read_reg(chip->client, MAX17047_V_empty);
164        if (ret < 0)
165            return ret;
166
167        val->intval = ret >> 7;
168        val->intval *= 10000; /* Units of LSB = 10mV */
169        break;
170    case POWER_SUPPLY_PROP_VOLTAGE_NOW:
171        ret = max17042_read_reg(chip->client, MAX17042_VCELL);
172        if (ret < 0)
173            return ret;
174
175        val->intval = ret * 625 / 8;
176        break;
177    case POWER_SUPPLY_PROP_VOLTAGE_AVG:
178        ret = max17042_read_reg(chip->client, MAX17042_AvgVCELL);
179        if (ret < 0)
180            return ret;
181
182        val->intval = ret * 625 / 8;
183        break;
184    case POWER_SUPPLY_PROP_VOLTAGE_OCV:
185        ret = max17042_read_reg(chip->client, MAX17042_OCVInternal);
186        if (ret < 0)
187            return ret;
188
189        val->intval = ret * 625 / 8;
190        break;
191    case POWER_SUPPLY_PROP_CAPACITY:
192        ret = max17042_read_reg(chip->client, MAX17042_RepSOC);
193        if (ret < 0)
194            return ret;
195
196        val->intval = ret >> 8;
197        break;
198    case POWER_SUPPLY_PROP_CHARGE_FULL:
199        ret = max17042_read_reg(chip->client, MAX17042_FullCAP);
200        if (ret < 0)
201            return ret;
202
203        val->intval = ret * 1000 / 2;
204        break;
205    case POWER_SUPPLY_PROP_CHARGE_COUNTER:
206        ret = max17042_read_reg(chip->client, MAX17042_QH);
207        if (ret < 0)
208            return ret;
209
210        val->intval = ret * 1000 / 2;
211        break;
212    case POWER_SUPPLY_PROP_TEMP:
213        ret = max17042_read_reg(chip->client, MAX17042_TEMP);
214        if (ret < 0)
215            return ret;
216
217        val->intval = ret;
218        /* The value is signed. */
219        if (val->intval & 0x8000) {
220            val->intval = (0x7fff & ~val->intval) + 1;
221            val->intval *= -1;
222        }
223        /* The value is converted into deci-centigrade scale */
224        /* Units of LSB = 1 / 256 degree Celsius */
225        val->intval = val->intval * 10 / 256;
226        break;
227    case POWER_SUPPLY_PROP_CURRENT_NOW:
228        if (chip->pdata->enable_current_sense) {
229            ret = max17042_read_reg(chip->client, MAX17042_Current);
230            if (ret < 0)
231                return ret;
232
233            val->intval = ret;
234            if (val->intval & 0x8000) {
235                /* Negative */
236                val->intval = ~val->intval & 0x7fff;
237                val->intval++;
238                val->intval *= -1;
239            }
240            val->intval *= 1562500 / chip->pdata->r_sns;
241        } else {
242            return -EINVAL;
243        }
244        break;
245    case POWER_SUPPLY_PROP_CURRENT_AVG:
246        if (chip->pdata->enable_current_sense) {
247            ret = max17042_read_reg(chip->client,
248                        MAX17042_AvgCurrent);
249            if (ret < 0)
250                return ret;
251
252            val->intval = ret;
253            if (val->intval & 0x8000) {
254                /* Negative */
255                val->intval = ~val->intval & 0x7fff;
256                val->intval++;
257                val->intval *= -1;
258            }
259            val->intval *= 1562500 / chip->pdata->r_sns;
260        } else {
261            return -EINVAL;
262        }
263        break;
264    default:
265        return -EINVAL;
266    }
267    return 0;
268}
269
270static int max17042_write_verify_reg(struct i2c_client *client,
271                u8 reg, u16 value)
272{
273    int retries = 8;
274    int ret;
275    u16 read_value;
276
277    do {
278        ret = i2c_smbus_write_word_data(client, reg, value);
279        read_value = max17042_read_reg(client, reg);
280        if (read_value != value) {
281            ret = -EIO;
282            retries--;
283        }
284    } while (retries && read_value != value);
285
286    if (ret < 0)
287        dev_err(&client->dev, "%s: err %d\n", __func__, ret);
288
289    return ret;
290}
291
292static inline void max17042_override_por(
293    struct i2c_client *client, u8 reg, u16 value)
294{
295    if (value)
296        max17042_write_reg(client, reg, value);
297}
298
299static inline void max10742_unlock_model(struct max17042_chip *chip)
300{
301    struct i2c_client *client = chip->client;
302    max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
303    max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
304}
305
306static inline void max10742_lock_model(struct max17042_chip *chip)
307{
308    struct i2c_client *client = chip->client;
309    max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_LOCK1);
310    max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_LOCK2);
311}
312
313static inline void max17042_write_model_data(struct max17042_chip *chip,
314                    u8 addr, int size)
315{
316    struct i2c_client *client = chip->client;
317    int i;
318    for (i = 0; i < size; i++)
319        max17042_write_reg(client, addr + i,
320                chip->pdata->config_data->cell_char_tbl[i]);
321}
322
323static inline void max17042_read_model_data(struct max17042_chip *chip,
324                    u8 addr, u16 *data, int size)
325{
326    struct i2c_client *client = chip->client;
327    int i;
328
329    for (i = 0; i < size; i++)
330        data[i] = max17042_read_reg(client, addr + i);
331}
332
333static inline int max17042_model_data_compare(struct max17042_chip *chip,
334                    u16 *data1, u16 *data2, int size)
335{
336    int i;
337
338    if (memcmp(data1, data2, size)) {
339        dev_err(&chip->client->dev, "%s compare failed\n", __func__);
340        for (i = 0; i < size; i++)
341            dev_info(&chip->client->dev, "0x%x, 0x%x",
342                data1[i], data2[i]);
343        dev_info(&chip->client->dev, "\n");
344        return -EINVAL;
345    }
346    return 0;
347}
348
349static int max17042_init_model(struct max17042_chip *chip)
350{
351    int ret;
352    int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
353    u16 *temp_data;
354
355    temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
356    if (!temp_data)
357        return -ENOMEM;
358
359    max10742_unlock_model(chip);
360    max17042_write_model_data(chip, MAX17042_MODELChrTbl,
361                table_size);
362    max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
363                table_size);
364
365    ret = max17042_model_data_compare(
366        chip,
367        chip->pdata->config_data->cell_char_tbl,
368        temp_data,
369        table_size);
370
371    max10742_lock_model(chip);
372    kfree(temp_data);
373
374    return ret;
375}
376
377static int max17042_verify_model_lock(struct max17042_chip *chip)
378{
379    int i;
380    int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
381    u16 *temp_data;
382    int ret = 0;
383
384    temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
385    if (!temp_data)
386        return -ENOMEM;
387
388    max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
389                table_size);
390    for (i = 0; i < table_size; i++)
391        if (temp_data[i])
392            ret = -EINVAL;
393
394    kfree(temp_data);
395    return ret;
396}
397
398static void max17042_write_config_regs(struct max17042_chip *chip)
399{
400    struct max17042_config_data *config = chip->pdata->config_data;
401
402    max17042_write_reg(chip->client, MAX17042_CONFIG, config->config);
403    max17042_write_reg(chip->client, MAX17042_LearnCFG, config->learn_cfg);
404    max17042_write_reg(chip->client, MAX17042_FilterCFG,
405            config->filter_cfg);
406    max17042_write_reg(chip->client, MAX17042_RelaxCFG, config->relax_cfg);
407    if (chip->chip_type == MAX17047)
408        max17042_write_reg(chip->client, MAX17047_FullSOCThr,
409                        config->full_soc_thresh);
410}
411
412static void max17042_write_custom_regs(struct max17042_chip *chip)
413{
414    struct max17042_config_data *config = chip->pdata->config_data;
415
416    max17042_write_verify_reg(chip->client, MAX17042_RCOMP0,
417                config->rcomp0);
418    max17042_write_verify_reg(chip->client, MAX17042_TempCo,
419                config->tcompc0);
420    max17042_write_verify_reg(chip->client, MAX17042_ICHGTerm,
421                config->ichgt_term);
422    if (chip->chip_type == MAX17042) {
423        max17042_write_reg(chip->client, MAX17042_EmptyTempCo,
424                    config->empty_tempco);
425        max17042_write_verify_reg(chip->client, MAX17042_K_empty0,
426                    config->kempty0);
427    } else {
428        max17042_write_verify_reg(chip->client, MAX17047_QRTbl00,
429                        config->qrtbl00);
430        max17042_write_verify_reg(chip->client, MAX17047_QRTbl10,
431                        config->qrtbl10);
432        max17042_write_verify_reg(chip->client, MAX17047_QRTbl20,
433                        config->qrtbl20);
434        max17042_write_verify_reg(chip->client, MAX17047_QRTbl30,
435                        config->qrtbl30);
436    }
437}
438
439static void max17042_update_capacity_regs(struct max17042_chip *chip)
440{
441    struct max17042_config_data *config = chip->pdata->config_data;
442
443    max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
444                config->fullcap);
445    max17042_write_reg(chip->client, MAX17042_DesignCap,
446            config->design_cap);
447    max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
448                config->fullcapnom);
449}
450
451static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
452{
453    u16 vfSoc;
454
455    vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);
456    max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
457    max17042_write_verify_reg(chip->client, MAX17042_VFSOC0, vfSoc);
458    max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
459}
460
461static void max17042_load_new_capacity_params(struct max17042_chip *chip)
462{
463    u16 full_cap0, rep_cap, dq_acc, vfSoc;
464    u32 rem_cap;
465
466    struct max17042_config_data *config = chip->pdata->config_data;
467
468    full_cap0 = max17042_read_reg(chip->client, MAX17042_FullCAP0);
469    vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);
470
471    /* fg_vfSoc needs to shifted by 8 bits to get the
472     * perc in 1% accuracy, to get the right rem_cap multiply
473     * full_cap0, fg_vfSoc and devide by 100
474     */
475    rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
476    max17042_write_verify_reg(chip->client, MAX17042_RemCap, (u16)rem_cap);
477
478    rep_cap = (u16)rem_cap;
479    max17042_write_verify_reg(chip->client, MAX17042_RepCap, rep_cap);
480
481    /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
482    dq_acc = config->fullcap / dQ_ACC_DIV;
483    max17042_write_verify_reg(chip->client, MAX17042_dQacc, dq_acc);
484    max17042_write_verify_reg(chip->client, MAX17042_dPacc, dP_ACC_200);
485
486    max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
487            config->fullcap);
488    max17042_write_reg(chip->client, MAX17042_DesignCap,
489            config->design_cap);
490    max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
491            config->fullcapnom);
492    /* Update SOC register with new SOC */
493    max17042_write_reg(chip->client, MAX17042_RepSOC, vfSoc);
494}
495
496/*
497 * Block write all the override values coming from platform data.
498 * This function MUST be called before the POR initialization proceedure
499 * specified by maxim.
500 */
501static inline void max17042_override_por_values(struct max17042_chip *chip)
502{
503    struct i2c_client *client = chip->client;
504    struct max17042_config_data *config = chip->pdata->config_data;
505
506    max17042_override_por(client, MAX17042_TGAIN, config->tgain);
507    max17042_override_por(client, MAx17042_TOFF, config->toff);
508    max17042_override_por(client, MAX17042_CGAIN, config->cgain);
509    max17042_override_por(client, MAX17042_COFF, config->coff);
510
511    max17042_override_por(client, MAX17042_VALRT_Th, config->valrt_thresh);
512    max17042_override_por(client, MAX17042_TALRT_Th, config->talrt_thresh);
513    max17042_override_por(client, MAX17042_SALRT_Th,
514            config->soc_alrt_thresh);
515    max17042_override_por(client, MAX17042_CONFIG, config->config);
516    max17042_override_por(client, MAX17042_SHDNTIMER, config->shdntimer);
517
518    max17042_override_por(client, MAX17042_DesignCap, config->design_cap);
519    max17042_override_por(client, MAX17042_ICHGTerm, config->ichgt_term);
520
521    max17042_override_por(client, MAX17042_AtRate, config->at_rate);
522    max17042_override_por(client, MAX17042_LearnCFG, config->learn_cfg);
523    max17042_override_por(client, MAX17042_FilterCFG, config->filter_cfg);
524    max17042_override_por(client, MAX17042_RelaxCFG, config->relax_cfg);
525    max17042_override_por(client, MAX17042_MiscCFG, config->misc_cfg);
526    max17042_override_por(client, MAX17042_MaskSOC, config->masksoc);
527
528    max17042_override_por(client, MAX17042_FullCAP, config->fullcap);
529    max17042_override_por(client, MAX17042_FullCAPNom, config->fullcapnom);
530    if (chip->chip_type == MAX17042)
531        max17042_override_por(client, MAX17042_SOC_empty,
532                        config->socempty);
533    max17042_override_por(client, MAX17042_LAvg_empty, config->lavg_empty);
534    max17042_override_por(client, MAX17042_dQacc, config->dqacc);
535    max17042_override_por(client, MAX17042_dPacc, config->dpacc);
536
537    if (chip->chip_type == MAX17042)
538        max17042_override_por(client, MAX17042_V_empty, config->vempty);
539    else
540        max17042_override_por(client, MAX17047_V_empty, config->vempty);
541    max17042_override_por(client, MAX17042_TempNom, config->temp_nom);
542    max17042_override_por(client, MAX17042_TempLim, config->temp_lim);
543    max17042_override_por(client, MAX17042_FCTC, config->fctc);
544    max17042_override_por(client, MAX17042_RCOMP0, config->rcomp0);
545    max17042_override_por(client, MAX17042_TempCo, config->tcompc0);
546    if (chip->chip_type) {
547        max17042_override_por(client, MAX17042_EmptyTempCo,
548                    config->empty_tempco);
549        max17042_override_por(client, MAX17042_K_empty0,
550                    config->kempty0);
551    }
552}
553
554static int max17042_init_chip(struct max17042_chip *chip)
555{
556    int ret;
557    int val;
558
559    max17042_override_por_values(chip);
560    /* After Power up, the MAX17042 requires 500mS in order
561     * to perform signal debouncing and initial SOC reporting
562     */
563    msleep(500);
564
565    /* Initialize configaration */
566    max17042_write_config_regs(chip);
567
568    /* write cell characterization data */
569    ret = max17042_init_model(chip);
570    if (ret) {
571        dev_err(&chip->client->dev, "%s init failed\n",
572            __func__);
573        return -EIO;
574    }
575    max17042_verify_model_lock(chip);
576    if (ret) {
577        dev_err(&chip->client->dev, "%s lock verify failed\n",
578            __func__);
579        return -EIO;
580    }
581    /* write custom parameters */
582    max17042_write_custom_regs(chip);
583
584    /* update capacity params */
585    max17042_update_capacity_regs(chip);
586
587    /* delay must be atleast 350mS to allow VFSOC
588     * to be calculated from the new configuration
589     */
590    msleep(350);
591
592    /* reset vfsoc0 reg */
593    max17042_reset_vfsoc0_reg(chip);
594
595    /* load new capacity params */
596    max17042_load_new_capacity_params(chip);
597
598    /* Init complete, Clear the POR bit */
599    val = max17042_read_reg(chip->client, MAX17042_STATUS);
600    max17042_write_reg(chip->client, MAX17042_STATUS,
601            val & (~STATUS_POR_BIT));
602    return 0;
603}
604
605static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
606{
607    u16 soc, soc_tr;
608
609    /* program interrupt thesholds such that we should
610     * get interrupt for every 'off' perc change in the soc
611     */
612    soc = max17042_read_reg(chip->client, MAX17042_RepSOC) >> 8;
613    soc_tr = (soc + off) << 8;
614    soc_tr |= (soc - off);
615    max17042_write_reg(chip->client, MAX17042_SALRT_Th, soc_tr);
616}
617
618static irqreturn_t max17042_thread_handler(int id, void *dev)
619{
620    struct max17042_chip *chip = dev;
621    u16 val;
622
623    val = max17042_read_reg(chip->client, MAX17042_STATUS);
624    if ((val & STATUS_INTR_SOCMIN_BIT) ||
625        (val & STATUS_INTR_SOCMAX_BIT)) {
626        dev_info(&chip->client->dev, "SOC threshold INTR\n");
627        max17042_set_soc_threshold(chip, 1);
628    }
629
630    power_supply_changed(&chip->battery);
631    return IRQ_HANDLED;
632}
633
634static void max17042_init_worker(struct work_struct *work)
635{
636    struct max17042_chip *chip = container_of(work,
637                struct max17042_chip, work);
638    int ret;
639
640    /* Initialize registers according to values from the platform data */
641    if (chip->pdata->enable_por_init && chip->pdata->config_data) {
642        ret = max17042_init_chip(chip);
643        if (ret)
644            return;
645    }
646
647    chip->init_complete = 1;
648}
649
650#ifdef CONFIG_OF
651static struct max17042_platform_data *
652max17042_get_pdata(struct device *dev)
653{
654    struct device_node *np = dev->of_node;
655    u32 prop;
656    struct max17042_platform_data *pdata;
657
658    if (!np)
659        return dev->platform_data;
660
661    pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
662    if (!pdata)
663        return NULL;
664
665    /*
666     * Require current sense resistor value to be specified for
667     * current-sense functionality to be enabled at all.
668     */
669    if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
670        pdata->r_sns = prop;
671        pdata->enable_current_sense = true;
672    }
673
674    return pdata;
675}
676#else
677static struct max17042_platform_data *
678max17042_get_pdata(struct device *dev)
679{
680    return dev->platform_data;
681}
682#endif
683
684static int __devinit max17042_probe(struct i2c_client *client,
685            const struct i2c_device_id *id)
686{
687    struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
688    struct max17042_chip *chip;
689    int ret;
690    int reg;
691
692    if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
693        return -EIO;
694
695    chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
696    if (!chip)
697        return -ENOMEM;
698
699    chip->client = client;
700    chip->pdata = max17042_get_pdata(&client->dev);
701    if (!chip->pdata) {
702        dev_err(&client->dev, "no platform data provided\n");
703        return -EINVAL;
704    }
705
706    i2c_set_clientdata(client, chip);
707
708    ret = max17042_read_reg(chip->client, MAX17042_DevName);
709    if (ret == MAX17042_IC_VERSION) {
710        dev_dbg(&client->dev, "chip type max17042 detected\n");
711        chip->chip_type = MAX17042;
712    } else if (ret == MAX17047_IC_VERSION) {
713        dev_dbg(&client->dev, "chip type max17047/50 detected\n");
714        chip->chip_type = MAX17047;
715    } else {
716        dev_err(&client->dev, "device version mismatch: %x\n", ret);
717        return -EIO;
718    }
719
720    chip->battery.name = "max170xx_battery";
721    chip->battery.type = POWER_SUPPLY_TYPE_BATTERY;
722    chip->battery.get_property = max17042_get_property;
723    chip->battery.properties = max17042_battery_props;
724    chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props);
725
726    /* When current is not measured,
727     * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
728    if (!chip->pdata->enable_current_sense)
729        chip->battery.num_properties -= 2;
730
731    if (chip->pdata->r_sns == 0)
732        chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
733
734    if (chip->pdata->init_data)
735        max17042_set_reg(client, chip->pdata->init_data,
736                chip->pdata->num_init_data);
737
738    if (!chip->pdata->enable_current_sense) {
739        max17042_write_reg(client, MAX17042_CGAIN, 0x0000);
740        max17042_write_reg(client, MAX17042_MiscCFG, 0x0003);
741        max17042_write_reg(client, MAX17042_LearnCFG, 0x0007);
742    }
743
744    ret = power_supply_register(&client->dev, &chip->battery);
745    if (ret) {
746        dev_err(&client->dev, "failed: power supply register\n");
747        return ret;
748    }
749
750    if (client->irq) {
751        ret = request_threaded_irq(client->irq, NULL,
752                        max17042_thread_handler,
753                        IRQF_TRIGGER_FALLING,
754                        chip->battery.name, chip);
755        if (!ret) {
756            reg = max17042_read_reg(client, MAX17042_CONFIG);
757            reg |= CONFIG_ALRT_BIT_ENBL;
758            max17042_write_reg(client, MAX17042_CONFIG, reg);
759            max17042_set_soc_threshold(chip, 1);
760        } else {
761            client->irq = 0;
762            dev_err(&client->dev, "%s(): cannot get IRQ\n",
763                __func__);
764        }
765    }
766
767    reg = max17042_read_reg(chip->client, MAX17042_STATUS);
768    if (reg & STATUS_POR_BIT) {
769        INIT_WORK(&chip->work, max17042_init_worker);
770        schedule_work(&chip->work);
771    } else {
772        chip->init_complete = 1;
773    }
774
775    return 0;
776}
777
778static int __devexit max17042_remove(struct i2c_client *client)
779{
780    struct max17042_chip *chip = i2c_get_clientdata(client);
781
782    if (client->irq)
783        free_irq(client->irq, chip);
784    power_supply_unregister(&chip->battery);
785    return 0;
786}
787
788#ifdef CONFIG_PM
789static int max17042_suspend(struct device *dev)
790{
791    struct max17042_chip *chip = dev_get_drvdata(dev);
792
793    /*
794     * disable the irq and enable irq_wake
795     * capability to the interrupt line.
796     */
797    if (chip->client->irq) {
798        disable_irq(chip->client->irq);
799        enable_irq_wake(chip->client->irq);
800    }
801
802    return 0;
803}
804
805static int max17042_resume(struct device *dev)
806{
807    struct max17042_chip *chip = dev_get_drvdata(dev);
808
809    if (chip->client->irq) {
810        disable_irq_wake(chip->client->irq);
811        enable_irq(chip->client->irq);
812        /* re-program the SOC thresholds to 1% change */
813        max17042_set_soc_threshold(chip, 1);
814    }
815
816    return 0;
817}
818
819static const struct dev_pm_ops max17042_pm_ops = {
820    .suspend = max17042_suspend,
821    .resume = max17042_resume,
822};
823
824#define MAX17042_PM_OPS (&max17042_pm_ops)
825#else
826#define MAX17042_PM_OPS NULL
827#endif
828
829#ifdef CONFIG_OF
830static const struct of_device_id max17042_dt_match[] = {
831    { .compatible = "maxim,max17042" },
832    { .compatible = "maxim,max17047" },
833    { .compatible = "maxim,max17050" },
834    { },
835};
836MODULE_DEVICE_TABLE(of, max17042_dt_match);
837#endif
838
839static const struct i2c_device_id max17042_id[] = {
840    { "max17042", 0 },
841    { "max17047", 1 },
842    { "max17050", 2 },
843    { }
844};
845MODULE_DEVICE_TABLE(i2c, max17042_id);
846
847static struct i2c_driver max17042_i2c_driver = {
848    .driver = {
849        .name = "max17042",
850        .of_match_table = of_match_ptr(max17042_dt_match),
851        .pm = MAX17042_PM_OPS,
852    },
853    .probe = max17042_probe,
854    .remove = __devexit_p(max17042_remove),
855    .id_table = max17042_id,
856};
857module_i2c_driver(max17042_i2c_driver);
858
859MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
860MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
861MODULE_LICENSE("GPL");
862

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