2 * Battery driver for Maxim MAX8925
4 * Copyright (c) 2009-2010 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/module.h>
13 #include <linux/err.h>
14 #include <linux/slab.h>
15 #include <linux/i2c.h>
16 #include <linux/interrupt.h>
17 #include <linux/platform_device.h>
18 #include <linux/power_supply.h>
19 #include <linux/mfd/max8925.h>
21 /* registers in GPM */
22 #define MAX8925_OUT5VEN 0x54
23 #define MAX8925_OUT3VEN 0x58
24 #define MAX8925_CHG_CNTL1 0x7c
27 #define MAX8925_CHG_STAT_VSYSLOW (1 << 0)
28 #define MAX8925_CHG_STAT_MODE_MASK (3 << 2)
29 #define MAX8925_CHG_STAT_EN_MASK (1 << 4)
30 #define MAX8925_CHG_MBDET (1 << 1)
31 #define MAX8925_CHG_AC_RANGE_MASK (3 << 6)
33 /* registers in ADC */
34 #define MAX8925_ADC_RES_CNFG1 0x06
35 #define MAX8925_ADC_AVG_CNFG1 0x07
36 #define MAX8925_ADC_ACQ_CNFG1 0x08
37 #define MAX8925_ADC_ACQ_CNFG2 0x09
38 /* 2 bytes registers in below. MSB is 1st, LSB is 2nd. */
39 #define MAX8925_ADC_AUX2 0x62
40 #define MAX8925_ADC_VCHG 0x64
41 #define MAX8925_ADC_VBBATT 0x66
42 #define MAX8925_ADC_VMBATT 0x68
43 #define MAX8925_ADC_ISNS 0x6a
44 #define MAX8925_ADC_THM 0x6c
45 #define MAX8925_ADC_TDIE 0x6e
46 #define MAX8925_CMD_AUX2 0xc8
47 #define MAX8925_CMD_VCHG 0xd0
48 #define MAX8925_CMD_VBBATT 0xd8
49 #define MAX8925_CMD_VMBATT 0xe0
50 #define MAX8925_CMD_ISNS 0xe8
51 #define MAX8925_CMD_THM 0xf0
52 #define MAX8925_CMD_TDIE 0xf8
65 struct max8925_power_info {
66 struct max8925_chip *chip;
67 struct i2c_client *gpm;
68 struct i2c_client *adc;
70 struct power_supply ac;
71 struct power_supply usb;
72 struct power_supply battery;
75 unsigned usb_online:1;
76 unsigned bat_online:1;
78 unsigned batt_detect:1; /* detecing MB by ID pin */
79 unsigned topoff_threshold:2;
80 unsigned fast_charge:3;
81 unsigned no_temp_support:1;
82 unsigned no_insert_detect:1;
84 int (*set_charger) (int);
87 static int __set_charger(struct max8925_power_info *info, int enable)
89 struct max8925_chip *chip = info->chip;
91 /* enable charger in platform */
92 if (info->set_charger)
95 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 0);
98 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
99 if (info->set_charger)
100 info->set_charger(0);
102 dev_dbg(chip->dev, "%s\n", (enable) ? "Enable charger"
103 : "Disable charger");
107 static irqreturn_t max8925_charger_handler(int irq, void *data)
109 struct max8925_power_info *info = (struct max8925_power_info *)data;
110 struct max8925_chip *chip = info->chip;
112 switch (irq - chip->irq_base) {
113 case MAX8925_IRQ_VCHG_DC_R:
115 __set_charger(info, 1);
116 dev_dbg(chip->dev, "Adapter inserted\n");
118 case MAX8925_IRQ_VCHG_DC_F:
120 __set_charger(info, 0);
121 dev_dbg(chip->dev, "Adapter removed\n");
123 case MAX8925_IRQ_VCHG_THM_OK_F:
124 /* Battery is not ready yet */
125 dev_dbg(chip->dev, "Battery temperature is out of range\n");
126 case MAX8925_IRQ_VCHG_DC_OVP:
127 dev_dbg(chip->dev, "Error detection\n");
128 __set_charger(info, 0);
130 case MAX8925_IRQ_VCHG_THM_OK_R:
131 /* Battery is ready now */
132 dev_dbg(chip->dev, "Battery temperature is in range\n");
134 case MAX8925_IRQ_VCHG_SYSLOW_R:
136 dev_info(chip->dev, "Sys power is too low\n");
138 case MAX8925_IRQ_VCHG_SYSLOW_F:
139 dev_dbg(chip->dev, "Sys power is above low threshold\n");
141 case MAX8925_IRQ_VCHG_DONE:
142 __set_charger(info, 0);
143 dev_dbg(chip->dev, "Charging is done\n");
145 case MAX8925_IRQ_VCHG_TOPOFF:
146 dev_dbg(chip->dev, "Charging in top-off mode\n");
148 case MAX8925_IRQ_VCHG_TMR_FAULT:
149 __set_charger(info, 0);
150 dev_dbg(chip->dev, "Safe timer is expired\n");
152 case MAX8925_IRQ_VCHG_RST:
153 __set_charger(info, 0);
154 dev_dbg(chip->dev, "Charger is reset\n");
160 static int start_measure(struct max8925_power_info *info, int type)
162 unsigned char buf[2] = {0, 0};
164 int meas_reg = 0, ret;
168 meas_cmd = MAX8925_CMD_VCHG;
169 meas_reg = MAX8925_ADC_VCHG;
172 meas_cmd = MAX8925_CMD_VBBATT;
173 meas_reg = MAX8925_ADC_VBBATT;
176 meas_cmd = MAX8925_CMD_VMBATT;
177 meas_reg = MAX8925_ADC_VMBATT;
180 meas_cmd = MAX8925_CMD_ISNS;
181 meas_reg = MAX8925_ADC_ISNS;
187 max8925_reg_write(info->adc, meas_cmd, 0);
188 max8925_bulk_read(info->adc, meas_reg, 2, buf);
189 ret = ((buf[0]<<8) | buf[1]) >> 4;
194 static int max8925_ac_get_prop(struct power_supply *psy,
195 enum power_supply_property psp,
196 union power_supply_propval *val)
198 struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
202 case POWER_SUPPLY_PROP_ONLINE:
203 val->intval = info->ac_online;
205 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
206 if (info->ac_online) {
207 ret = start_measure(info, MEASURE_VCHG);
209 val->intval = ret * 2000; /* unit is uV */
223 static enum power_supply_property max8925_ac_props[] = {
224 POWER_SUPPLY_PROP_ONLINE,
225 POWER_SUPPLY_PROP_VOLTAGE_NOW,
228 static int max8925_usb_get_prop(struct power_supply *psy,
229 enum power_supply_property psp,
230 union power_supply_propval *val)
232 struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
236 case POWER_SUPPLY_PROP_ONLINE:
237 val->intval = info->usb_online;
239 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
240 if (info->usb_online) {
241 ret = start_measure(info, MEASURE_VCHG);
243 val->intval = ret * 2000; /* unit is uV */
257 static enum power_supply_property max8925_usb_props[] = {
258 POWER_SUPPLY_PROP_ONLINE,
259 POWER_SUPPLY_PROP_VOLTAGE_NOW,
262 static int max8925_bat_get_prop(struct power_supply *psy,
263 enum power_supply_property psp,
264 union power_supply_propval *val)
266 struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
270 case POWER_SUPPLY_PROP_ONLINE:
271 val->intval = info->bat_online;
273 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
274 if (info->bat_online) {
275 ret = start_measure(info, MEASURE_VMBATT);
277 val->intval = ret * 2000; /* unit is uV */
284 case POWER_SUPPLY_PROP_CURRENT_NOW:
285 if (info->bat_online) {
286 ret = start_measure(info, MEASURE_ISNS);
288 /* assume r_sns is 0.02 */
289 ret = ((ret * 6250) - 3125) /* uA */;
292 val->intval = ret; /* unit is mA */
299 case POWER_SUPPLY_PROP_CHARGE_TYPE:
300 if (!info->bat_online) {
304 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
305 ret = (ret & MAX8925_CHG_STAT_MODE_MASK) >> 2;
308 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
312 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
315 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
320 case POWER_SUPPLY_PROP_STATUS:
321 if (!info->bat_online) {
325 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
326 if (info->usb_online || info->ac_online) {
327 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
328 if (ret & MAX8925_CHG_STAT_EN_MASK)
329 val->intval = POWER_SUPPLY_STATUS_CHARGING;
331 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
341 static enum power_supply_property max8925_battery_props[] = {
342 POWER_SUPPLY_PROP_ONLINE,
343 POWER_SUPPLY_PROP_VOLTAGE_NOW,
344 POWER_SUPPLY_PROP_CURRENT_NOW,
345 POWER_SUPPLY_PROP_CHARGE_TYPE,
346 POWER_SUPPLY_PROP_STATUS,
349 #define REQUEST_IRQ(_irq, _name) \
351 ret = request_threaded_irq(chip->irq_base + _irq, NULL, \
352 max8925_charger_handler, \
353 IRQF_ONESHOT, _name, info); \
355 dev_err(chip->dev, "Failed to request IRQ #%d: %d\n", \
359 static __devinit int max8925_init_charger(struct max8925_chip *chip,
360 struct max8925_power_info *info)
364 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp");
365 if (!info->no_insert_detect) {
366 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove");
367 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert");
369 if (!info->no_temp_support) {
370 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R, "batt-temp-in-range");
371 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F, "batt-temp-out-range");
373 REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F, "vsys-high");
374 REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R, "vsys-low");
375 REQUEST_IRQ(MAX8925_IRQ_VCHG_RST, "charger-reset");
376 REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE, "charger-done");
377 REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff");
378 REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire");
380 info->usb_online = 0;
381 info->bat_online = 0;
383 /* check for power - can miss interrupt at boot time */
384 if (start_measure(info, MEASURE_VCHG) * 2000 > 500000)
389 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
392 * If battery detection is enabled, ID pin of battery is
393 * connected to MBDET pin of MAX8925. It could be used to
394 * detect battery presence.
395 * Otherwise, we have to assume that battery is always on.
397 if (info->batt_detect)
398 info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1;
400 info->bat_online = 1;
401 if (ret & MAX8925_CHG_AC_RANGE_MASK)
407 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
408 /* set charging current in charge topoff mode */
409 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 3 << 5,
410 info->topoff_threshold << 5);
411 /* set charing current in fast charge mode */
412 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 7, info->fast_charge);
417 static __devexit int max8925_deinit_charger(struct max8925_power_info *info)
419 struct max8925_chip *chip = info->chip;
422 irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP;
423 for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++)
429 static __devinit int max8925_power_probe(struct platform_device *pdev)
431 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
432 struct max8925_power_pdata *pdata = NULL;
433 struct max8925_power_info *info;
436 pdata = pdev->dev.platform_data;
438 dev_err(&pdev->dev, "platform data isn't assigned to "
443 info = kzalloc(sizeof(struct max8925_power_info), GFP_KERNEL);
447 info->gpm = chip->i2c;
448 info->adc = chip->adc;
449 platform_set_drvdata(pdev, info);
451 info->ac.name = "max8925-ac";
452 info->ac.type = POWER_SUPPLY_TYPE_MAINS;
453 info->ac.properties = max8925_ac_props;
454 info->ac.num_properties = ARRAY_SIZE(max8925_ac_props);
455 info->ac.get_property = max8925_ac_get_prop;
456 info->ac.supplied_to = pdata->supplied_to;
457 info->ac.num_supplicants = pdata->num_supplicants;
458 ret = power_supply_register(&pdev->dev, &info->ac);
461 info->ac.dev->parent = &pdev->dev;
463 info->usb.name = "max8925-usb";
464 info->usb.type = POWER_SUPPLY_TYPE_USB;
465 info->usb.properties = max8925_usb_props;
466 info->usb.num_properties = ARRAY_SIZE(max8925_usb_props);
467 info->usb.get_property = max8925_usb_get_prop;
468 info->usb.supplied_to = pdata->supplied_to;
469 info->usb.num_supplicants = pdata->num_supplicants;
471 ret = power_supply_register(&pdev->dev, &info->usb);
474 info->usb.dev->parent = &pdev->dev;
476 info->battery.name = "max8925-battery";
477 info->battery.type = POWER_SUPPLY_TYPE_BATTERY;
478 info->battery.properties = max8925_battery_props;
479 info->battery.num_properties = ARRAY_SIZE(max8925_battery_props);
480 info->battery.get_property = max8925_bat_get_prop;
481 ret = power_supply_register(&pdev->dev, &info->battery);
484 info->battery.dev->parent = &pdev->dev;
486 info->batt_detect = pdata->batt_detect;
487 info->topoff_threshold = pdata->topoff_threshold;
488 info->fast_charge = pdata->fast_charge;
489 info->set_charger = pdata->set_charger;
490 info->no_temp_support = pdata->no_temp_support;
491 info->no_insert_detect = pdata->no_insert_detect;
493 max8925_init_charger(chip, info);
496 power_supply_unregister(&info->battery);
498 power_supply_unregister(&info->ac);
504 static __devexit int max8925_power_remove(struct platform_device *pdev)
506 struct max8925_power_info *info = platform_get_drvdata(pdev);
509 power_supply_unregister(&info->ac);
510 power_supply_unregister(&info->usb);
511 power_supply_unregister(&info->battery);
512 max8925_deinit_charger(info);
518 static struct platform_driver max8925_power_driver = {
519 .probe = max8925_power_probe,
520 .remove = __devexit_p(max8925_power_remove),
522 .name = "max8925-power",
526 module_platform_driver(max8925_power_driver);
528 MODULE_LICENSE("GPL");
529 MODULE_DESCRIPTION("Power supply driver for MAX8925");
530 MODULE_ALIAS("platform:max8925-power");