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/i2c.h>
15 #include <linux/interrupt.h>
16 #include <linux/platform_device.h>
17 #include <linux/power_supply.h>
18 #include <linux/mfd/max8925.h>
20 /* registers in GPM */
21 #define MAX8925_OUT5VEN 0x54
22 #define MAX8925_OUT3VEN 0x58
23 #define MAX8925_CHG_CNTL1 0x7c
26 #define MAX8925_CHG_STAT_VSYSLOW (1 << 0)
27 #define MAX8925_CHG_STAT_MODE_MASK (3 << 2)
28 #define MAX8925_CHG_STAT_EN_MASK (1 << 4)
29 #define MAX8925_CHG_MBDET (1 << 1)
30 #define MAX8925_CHG_AC_RANGE_MASK (3 << 6)
32 /* registers in ADC */
33 #define MAX8925_ADC_RES_CNFG1 0x06
34 #define MAX8925_ADC_AVG_CNFG1 0x07
35 #define MAX8925_ADC_ACQ_CNFG1 0x08
36 #define MAX8925_ADC_ACQ_CNFG2 0x09
37 /* 2 bytes registers in below. MSB is 1st, LSB is 2nd. */
38 #define MAX8925_ADC_AUX2 0x62
39 #define MAX8925_ADC_VCHG 0x64
40 #define MAX8925_ADC_VBBATT 0x66
41 #define MAX8925_ADC_VMBATT 0x68
42 #define MAX8925_ADC_ISNS 0x6a
43 #define MAX8925_ADC_THM 0x6c
44 #define MAX8925_ADC_TDIE 0x6e
45 #define MAX8925_CMD_AUX2 0xc8
46 #define MAX8925_CMD_VCHG 0xd0
47 #define MAX8925_CMD_VBBATT 0xd8
48 #define MAX8925_CMD_VMBATT 0xe0
49 #define MAX8925_CMD_ISNS 0xe8
50 #define MAX8925_CMD_THM 0xf0
51 #define MAX8925_CMD_TDIE 0xf8
64 struct max8925_power_info
{
65 struct max8925_chip
*chip
;
66 struct i2c_client
*gpm
;
67 struct i2c_client
*adc
;
69 struct power_supply ac
;
70 struct power_supply usb
;
71 struct power_supply battery
;
74 unsigned usb_online
:1;
75 unsigned bat_online
:1;
77 unsigned batt_detect
:1; /* detecing MB by ID pin */
78 unsigned topoff_threshold
:2;
79 unsigned fast_charge
:3;
81 int (*set_charger
) (int);
84 static int __set_charger(struct max8925_power_info
*info
, int enable
)
86 struct max8925_chip
*chip
= info
->chip
;
88 /* enable charger in platform */
89 if (info
->set_charger
)
92 max8925_set_bits(info
->gpm
, MAX8925_CHG_CNTL1
, 1 << 7, 0);
95 max8925_set_bits(info
->gpm
, MAX8925_CHG_CNTL1
, 1 << 7, 1 << 7);
96 if (info
->set_charger
)
99 dev_dbg(chip
->dev
, "%s\n", (enable
) ? "Enable charger"
100 : "Disable charger");
104 static irqreturn_t
max8925_charger_handler(int irq
, void *data
)
106 struct max8925_power_info
*info
= (struct max8925_power_info
*)data
;
107 struct max8925_chip
*chip
= info
->chip
;
109 switch (irq
- chip
->irq_base
) {
110 case MAX8925_IRQ_VCHG_DC_R
:
112 __set_charger(info
, 1);
113 dev_dbg(chip
->dev
, "Adapter inserted\n");
115 case MAX8925_IRQ_VCHG_DC_F
:
117 __set_charger(info
, 0);
118 dev_dbg(chip
->dev
, "Adapter is removal\n");
120 case MAX8925_IRQ_VCHG_USB_R
:
121 info
->usb_online
= 1;
122 __set_charger(info
, 1);
123 dev_dbg(chip
->dev
, "USB inserted\n");
125 case MAX8925_IRQ_VCHG_USB_F
:
126 info
->usb_online
= 0;
127 __set_charger(info
, 0);
128 dev_dbg(chip
->dev
, "USB is removal\n");
130 case MAX8925_IRQ_VCHG_THM_OK_F
:
131 /* Battery is not ready yet */
132 dev_dbg(chip
->dev
, "Battery temperature is out of range\n");
133 case MAX8925_IRQ_VCHG_DC_OVP
:
134 dev_dbg(chip
->dev
, "Error detection\n");
135 __set_charger(info
, 0);
137 case MAX8925_IRQ_VCHG_THM_OK_R
:
138 /* Battery is ready now */
139 dev_dbg(chip
->dev
, "Battery temperature is in range\n");
141 case MAX8925_IRQ_VCHG_SYSLOW_R
:
143 dev_info(chip
->dev
, "Sys power is too low\n");
145 case MAX8925_IRQ_VCHG_SYSLOW_F
:
146 dev_dbg(chip
->dev
, "Sys power is above low threshold\n");
148 case MAX8925_IRQ_VCHG_DONE
:
149 __set_charger(info
, 0);
150 dev_dbg(chip
->dev
, "Charging is done\n");
152 case MAX8925_IRQ_VCHG_TOPOFF
:
153 dev_dbg(chip
->dev
, "Charging in top-off mode\n");
155 case MAX8925_IRQ_VCHG_TMR_FAULT
:
156 __set_charger(info
, 0);
157 dev_dbg(chip
->dev
, "Safe timer is expired\n");
159 case MAX8925_IRQ_VCHG_RST
:
160 __set_charger(info
, 0);
161 dev_dbg(chip
->dev
, "Charger is reset\n");
167 static int start_measure(struct max8925_power_info
*info
, int type
)
169 unsigned char buf
[2] = {0, 0};
170 int meas_reg
= 0, ret
;
174 meas_reg
= MAX8925_ADC_VCHG
;
177 meas_reg
= MAX8925_ADC_VBBATT
;
180 meas_reg
= MAX8925_ADC_VMBATT
;
183 meas_reg
= MAX8925_ADC_ISNS
;
189 max8925_bulk_read(info
->adc
, meas_reg
, 2, buf
);
190 ret
= (buf
[0] << 4) | (buf
[1] >> 4);
195 static int max8925_ac_get_prop(struct power_supply
*psy
,
196 enum power_supply_property psp
,
197 union power_supply_propval
*val
)
199 struct max8925_power_info
*info
= dev_get_drvdata(psy
->dev
->parent
);
203 case POWER_SUPPLY_PROP_ONLINE
:
204 val
->intval
= info
->ac_online
;
206 case POWER_SUPPLY_PROP_VOLTAGE_NOW
:
207 if (info
->ac_online
) {
208 ret
= start_measure(info
, MEASURE_VCHG
);
210 val
->intval
= ret
<< 1; /* unit is mV */
224 static enum power_supply_property max8925_ac_props
[] = {
225 POWER_SUPPLY_PROP_ONLINE
,
226 POWER_SUPPLY_PROP_VOLTAGE_NOW
,
229 static int max8925_usb_get_prop(struct power_supply
*psy
,
230 enum power_supply_property psp
,
231 union power_supply_propval
*val
)
233 struct max8925_power_info
*info
= dev_get_drvdata(psy
->dev
->parent
);
237 case POWER_SUPPLY_PROP_ONLINE
:
238 val
->intval
= info
->usb_online
;
240 case POWER_SUPPLY_PROP_VOLTAGE_NOW
:
241 if (info
->usb_online
) {
242 ret
= start_measure(info
, MEASURE_VCHG
);
244 val
->intval
= ret
<< 1; /* unit is mV */
258 static enum power_supply_property max8925_usb_props
[] = {
259 POWER_SUPPLY_PROP_ONLINE
,
260 POWER_SUPPLY_PROP_VOLTAGE_NOW
,
263 static int max8925_bat_get_prop(struct power_supply
*psy
,
264 enum power_supply_property psp
,
265 union power_supply_propval
*val
)
267 struct max8925_power_info
*info
= dev_get_drvdata(psy
->dev
->parent
);
268 long long int tmp
= 0;
272 case POWER_SUPPLY_PROP_ONLINE
:
273 val
->intval
= info
->bat_online
;
275 case POWER_SUPPLY_PROP_VOLTAGE_NOW
:
276 if (info
->bat_online
) {
277 ret
= start_measure(info
, MEASURE_VMBATT
);
279 val
->intval
= ret
<< 1; /* unit is mV */
286 case POWER_SUPPLY_PROP_CURRENT_NOW
:
287 if (info
->bat_online
) {
288 ret
= start_measure(info
, MEASURE_ISNS
);
290 tmp
= (long long int)ret
* 6250 / 4096 - 3125;
294 val
->intval
= ret
; /* unit is mA */
301 case POWER_SUPPLY_PROP_CHARGE_TYPE
:
302 if (!info
->bat_online
) {
306 ret
= max8925_reg_read(info
->gpm
, MAX8925_CHG_STATUS
);
307 ret
= (ret
& MAX8925_CHG_STAT_MODE_MASK
) >> 2;
310 val
->intval
= POWER_SUPPLY_CHARGE_TYPE_FAST
;
314 val
->intval
= POWER_SUPPLY_CHARGE_TYPE_TRICKLE
;
317 val
->intval
= POWER_SUPPLY_CHARGE_TYPE_NONE
;
322 case POWER_SUPPLY_PROP_STATUS
:
323 if (!info
->bat_online
) {
327 ret
= max8925_reg_read(info
->gpm
, MAX8925_CHG_STATUS
);
328 if (info
->usb_online
|| info
->ac_online
) {
329 val
->intval
= POWER_SUPPLY_STATUS_NOT_CHARGING
;
330 if (ret
& MAX8925_CHG_STAT_EN_MASK
)
331 val
->intval
= POWER_SUPPLY_STATUS_CHARGING
;
333 val
->intval
= POWER_SUPPLY_STATUS_DISCHARGING
;
343 static enum power_supply_property max8925_battery_props
[] = {
344 POWER_SUPPLY_PROP_ONLINE
,
345 POWER_SUPPLY_PROP_VOLTAGE_NOW
,
346 POWER_SUPPLY_PROP_CURRENT_NOW
,
347 POWER_SUPPLY_PROP_CHARGE_TYPE
,
348 POWER_SUPPLY_PROP_STATUS
,
351 #define REQUEST_IRQ(_irq, _name) \
353 ret = request_threaded_irq(chip->irq_base + _irq, NULL, \
354 max8925_charger_handler, \
355 IRQF_ONESHOT, _name, info); \
357 dev_err(chip->dev, "Failed to request IRQ #%d: %d\n", \
361 static __devinit
int max8925_init_charger(struct max8925_chip
*chip
,
362 struct max8925_power_info
*info
)
366 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP
, "ac-ovp");
367 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F
, "ac-remove");
368 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R
, "ac-insert");
369 REQUEST_IRQ(MAX8925_IRQ_VCHG_USB_OVP
, "usb-ovp");
370 REQUEST_IRQ(MAX8925_IRQ_VCHG_USB_F
, "usb-remove");
371 REQUEST_IRQ(MAX8925_IRQ_VCHG_USB_R
, "usb-insert");
372 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R
, "batt-temp-in-range");
373 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F
, "batt-temp-out-range");
374 REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F
, "vsys-high");
375 REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R
, "vsys-low");
376 REQUEST_IRQ(MAX8925_IRQ_VCHG_RST
, "charger-reset");
377 REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE
, "charger-done");
378 REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF
, "charger-topoff");
379 REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT
, "charger-timer-expire");
382 info
->usb_online
= 0;
383 info
->bat_online
= 0;
384 ret
= max8925_reg_read(info
->gpm
, MAX8925_CHG_STATUS
);
387 * If battery detection is enabled, ID pin of battery is
388 * connected to MBDET pin of MAX8925. It could be used to
389 * detect battery presence.
390 * Otherwise, we have to assume that battery is always on.
392 if (info
->batt_detect
)
393 info
->bat_online
= (ret
& MAX8925_CHG_MBDET
) ? 0 : 1;
395 info
->bat_online
= 1;
396 if (ret
& MAX8925_CHG_AC_RANGE_MASK
)
402 max8925_set_bits(info
->gpm
, MAX8925_CHG_CNTL1
, 1 << 7, 1 << 7);
403 /* set charging current in charge topoff mode */
404 max8925_set_bits(info
->gpm
, MAX8925_CHG_CNTL1
, 3 << 5,
405 info
->topoff_threshold
<< 5);
406 /* set charing current in fast charge mode */
407 max8925_set_bits(info
->gpm
, MAX8925_CHG_CNTL1
, 7, info
->fast_charge
);
412 static __devexit
int max8925_deinit_charger(struct max8925_power_info
*info
)
414 struct max8925_chip
*chip
= info
->chip
;
417 irq
= chip
->irq_base
+ MAX8925_IRQ_VCHG_DC_OVP
;
418 for (; irq
<= chip
->irq_base
+ MAX8925_IRQ_VCHG_TMR_FAULT
; irq
++)
424 static __devinit
int max8925_power_probe(struct platform_device
*pdev
)
426 struct max8925_chip
*chip
= dev_get_drvdata(pdev
->dev
.parent
);
427 struct max8925_platform_data
*max8925_pdata
;
428 struct max8925_power_pdata
*pdata
= NULL
;
429 struct max8925_power_info
*info
;
432 if (pdev
->dev
.parent
->platform_data
) {
433 max8925_pdata
= pdev
->dev
.parent
->platform_data
;
434 pdata
= max8925_pdata
->power
;
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
;
450 info
->ac
.name
= "max8925-ac";
451 info
->ac
.type
= POWER_SUPPLY_TYPE_MAINS
;
452 info
->ac
.properties
= max8925_ac_props
;
453 info
->ac
.num_properties
= ARRAY_SIZE(max8925_ac_props
);
454 info
->ac
.get_property
= max8925_ac_get_prop
;
455 ret
= power_supply_register(&pdev
->dev
, &info
->ac
);
458 info
->ac
.dev
->parent
= &pdev
->dev
;
460 info
->usb
.name
= "max8925-usb";
461 info
->usb
.type
= POWER_SUPPLY_TYPE_USB
;
462 info
->usb
.properties
= max8925_usb_props
;
463 info
->usb
.num_properties
= ARRAY_SIZE(max8925_usb_props
);
464 info
->usb
.get_property
= max8925_usb_get_prop
;
465 ret
= power_supply_register(&pdev
->dev
, &info
->usb
);
468 info
->usb
.dev
->parent
= &pdev
->dev
;
470 info
->battery
.name
= "max8925-battery";
471 info
->battery
.type
= POWER_SUPPLY_TYPE_BATTERY
;
472 info
->battery
.properties
= max8925_battery_props
;
473 info
->battery
.num_properties
= ARRAY_SIZE(max8925_battery_props
);
474 info
->battery
.get_property
= max8925_bat_get_prop
;
475 ret
= power_supply_register(&pdev
->dev
, &info
->battery
);
478 info
->battery
.dev
->parent
= &pdev
->dev
;
480 info
->batt_detect
= pdata
->batt_detect
;
481 info
->topoff_threshold
= pdata
->topoff_threshold
;
482 info
->fast_charge
= pdata
->fast_charge
;
483 info
->set_charger
= pdata
->set_charger
;
484 dev_set_drvdata(&pdev
->dev
, info
);
485 platform_set_drvdata(pdev
, info
);
487 max8925_init_charger(chip
, info
);
490 power_supply_unregister(&info
->battery
);
492 power_supply_unregister(&info
->ac
);
498 static __devexit
int max8925_power_remove(struct platform_device
*pdev
)
500 struct max8925_power_info
*info
= platform_get_drvdata(pdev
);
503 power_supply_unregister(&info
->ac
);
504 power_supply_unregister(&info
->usb
);
505 power_supply_unregister(&info
->battery
);
506 max8925_deinit_charger(info
);
512 static struct platform_driver max8925_power_driver
= {
513 .probe
= max8925_power_probe
,
514 .remove
= __devexit_p(max8925_power_remove
),
516 .name
= "max8925-power",
520 static int __init
max8925_power_init(void)
522 return platform_driver_register(&max8925_power_driver
);
524 module_init(max8925_power_init
);
526 static void __exit
max8925_power_exit(void)
528 platform_driver_unregister(&max8925_power_driver
);
530 module_exit(max8925_power_exit
);
532 MODULE_LICENSE("GPL");
533 MODULE_DESCRIPTION("Power supply driver for MAX8925");
534 MODULE_ALIAS("platform:max8925-power");