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authorHaojian Zhuang <haojian.zhuang@marvell.com>2010-01-25 10:38:35 -0500
committerSamuel Ortiz <sameo@linux.intel.com>2010-03-07 16:17:17 -0500
commit28db38888b2a53b6bdd70104c2d2a199632ca507 (patch)
tree37534e1bf9f1fe8b17583a0ed8c98efe5bc16393 /drivers/power/max8925_power.c
parenta39069f6ce6500a5ca39e534108247f25169d8e0 (diff)
power_supply: Enable power supply of max8925
MAX8925 is a PMIC that contains charger component Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/power/max8925_power.c')
-rw-r--r--drivers/power/max8925_power.c534
1 files changed, 534 insertions, 0 deletions
diff --git a/drivers/power/max8925_power.c b/drivers/power/max8925_power.c
new file mode 100644
index 000000000000..a1b4410544d7
--- /dev/null
+++ b/drivers/power/max8925_power.c
@@ -0,0 +1,534 @@
1/*
2 * Battery driver for Maxim MAX8925
3 *
4 * Copyright (c) 2009-2010 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
6 *
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.
10 */
11
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>
19
20/* registers in GPM */
21#define MAX8925_OUT5VEN 0x54
22#define MAX8925_OUT3VEN 0x58
23#define MAX8925_CHG_CNTL1 0x7c
24
25/* bits definition */
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)
31
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
52
53enum {
54 MEASURE_AUX2,
55 MEASURE_VCHG,
56 MEASURE_VBBATT,
57 MEASURE_VMBATT,
58 MEASURE_ISNS,
59 MEASURE_THM,
60 MEASURE_TDIE,
61 MEASURE_MAX,
62};
63
64struct max8925_power_info {
65 struct max8925_chip *chip;
66 struct i2c_client *gpm;
67 struct i2c_client *adc;
68
69 struct power_supply ac;
70 struct power_supply usb;
71 struct power_supply battery;
72 int irq_base;
73 unsigned ac_online:1;
74 unsigned usb_online:1;
75 unsigned bat_online:1;
76 unsigned chg_mode:2;
77 unsigned batt_detect:1; /* detecing MB by ID pin */
78 unsigned topoff_threshold:2;
79 unsigned fast_charge:3;
80
81 int (*set_charger) (int);
82};
83
84static int __set_charger(struct max8925_power_info *info, int enable)
85{
86 struct max8925_chip *chip = info->chip;
87 if (enable) {
88 /* enable charger in platform */
89 if (info->set_charger)
90 info->set_charger(1);
91 /* enable charger */
92 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 0);
93 } else {
94 /* disable charge */
95 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
96 if (info->set_charger)
97 info->set_charger(0);
98 }
99 dev_dbg(chip->dev, "%s\n", (enable) ? "Enable charger"
100 : "Disable charger");
101 return 0;
102}
103
104static irqreturn_t max8925_charger_handler(int irq, void *data)
105{
106 struct max8925_power_info *info = (struct max8925_power_info *)data;
107 struct max8925_chip *chip = info->chip;
108
109 switch (irq - chip->irq_base) {
110 case MAX8925_IRQ_VCHG_DC_R:
111 info->ac_online = 1;
112 __set_charger(info, 1);
113 dev_dbg(chip->dev, "Adapter inserted\n");
114 break;
115 case MAX8925_IRQ_VCHG_DC_F:
116 info->ac_online = 0;
117 __set_charger(info, 0);
118 dev_dbg(chip->dev, "Adapter is removal\n");
119 break;
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");
124 break;
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");
129 break;
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);
136 break;
137 case MAX8925_IRQ_VCHG_THM_OK_R:
138 /* Battery is ready now */
139 dev_dbg(chip->dev, "Battery temperature is in range\n");
140 break;
141 case MAX8925_IRQ_VCHG_SYSLOW_R:
142 /* VSYS is low */
143 dev_info(chip->dev, "Sys power is too low\n");
144 break;
145 case MAX8925_IRQ_VCHG_SYSLOW_F:
146 dev_dbg(chip->dev, "Sys power is above low threshold\n");
147 break;
148 case MAX8925_IRQ_VCHG_DONE:
149 __set_charger(info, 0);
150 dev_dbg(chip->dev, "Charging is done\n");
151 break;
152 case MAX8925_IRQ_VCHG_TOPOFF:
153 dev_dbg(chip->dev, "Charging in top-off mode\n");
154 break;
155 case MAX8925_IRQ_VCHG_TMR_FAULT:
156 __set_charger(info, 0);
157 dev_dbg(chip->dev, "Safe timer is expired\n");
158 break;
159 case MAX8925_IRQ_VCHG_RST:
160 __set_charger(info, 0);
161 dev_dbg(chip->dev, "Charger is reset\n");
162 break;
163 }
164 return IRQ_HANDLED;
165}
166
167static int start_measure(struct max8925_power_info *info, int type)
168{
169 unsigned char buf[2] = {0, 0};
170 int meas_reg = 0, ret;
171
172 switch (type) {
173 case MEASURE_VCHG:
174 meas_reg = MAX8925_ADC_VCHG;
175 break;
176 case MEASURE_VBBATT:
177 meas_reg = MAX8925_ADC_VBBATT;
178 break;
179 case MEASURE_VMBATT:
180 meas_reg = MAX8925_ADC_VMBATT;
181 break;
182 case MEASURE_ISNS:
183 meas_reg = MAX8925_ADC_ISNS;
184 break;
185 default:
186 return -EINVAL;
187 }
188
189 max8925_bulk_read(info->adc, meas_reg, 2, buf);
190 ret = (buf[0] << 4) | (buf[1] >> 4);
191
192 return ret;
193}
194
195static int max8925_ac_get_prop(struct power_supply *psy,
196 enum power_supply_property psp,
197 union power_supply_propval *val)
198{
199 struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
200 int ret = 0;
201
202 switch (psp) {
203 case POWER_SUPPLY_PROP_ONLINE:
204 val->intval = info->ac_online;
205 break;
206 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
207 if (info->ac_online) {
208 ret = start_measure(info, MEASURE_VCHG);
209 if (ret >= 0) {
210 val->intval = ret << 1; /* unit is mV */
211 goto out;
212 }
213 }
214 ret = -ENODATA;
215 break;
216 default:
217 ret = -ENODEV;
218 break;
219 }
220out:
221 return ret;
222}
223
224static enum power_supply_property max8925_ac_props[] = {
225 POWER_SUPPLY_PROP_ONLINE,
226 POWER_SUPPLY_PROP_VOLTAGE_NOW,
227};
228
229static int max8925_usb_get_prop(struct power_supply *psy,
230 enum power_supply_property psp,
231 union power_supply_propval *val)
232{
233 struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
234 int ret = 0;
235
236 switch (psp) {
237 case POWER_SUPPLY_PROP_ONLINE:
238 val->intval = info->usb_online;
239 break;
240 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
241 if (info->usb_online) {
242 ret = start_measure(info, MEASURE_VCHG);
243 if (ret >= 0) {
244 val->intval = ret << 1; /* unit is mV */
245 goto out;
246 }
247 }
248 ret = -ENODATA;
249 break;
250 default:
251 ret = -ENODEV;
252 break;
253 }
254out:
255 return ret;
256}
257
258static enum power_supply_property max8925_usb_props[] = {
259 POWER_SUPPLY_PROP_ONLINE,
260 POWER_SUPPLY_PROP_VOLTAGE_NOW,
261};
262
263static int max8925_bat_get_prop(struct power_supply *psy,
264 enum power_supply_property psp,
265 union power_supply_propval *val)
266{
267 struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
268 long long int tmp = 0;
269 int ret = 0;
270
271 switch (psp) {
272 case POWER_SUPPLY_PROP_ONLINE:
273 val->intval = info->bat_online;
274 break;
275 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
276 if (info->bat_online) {
277 ret = start_measure(info, MEASURE_VMBATT);
278 if (ret >= 0) {
279 val->intval = ret << 1; /* unit is mV */
280 ret = 0;
281 break;
282 }
283 }
284 ret = -ENODATA;
285 break;
286 case POWER_SUPPLY_PROP_CURRENT_NOW:
287 if (info->bat_online) {
288 ret = start_measure(info, MEASURE_ISNS);
289 if (ret >= 0) {
290 tmp = (long long int)ret * 6250 / 4096 - 3125;
291 ret = (int)tmp;
292 val->intval = 0;
293 if (ret > 0)
294 val->intval = ret; /* unit is mA */
295 ret = 0;
296 break;
297 }
298 }
299 ret = -ENODATA;
300 break;
301 case POWER_SUPPLY_PROP_CHARGE_TYPE:
302 if (!info->bat_online) {
303 ret = -ENODATA;
304 break;
305 }
306 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
307 ret = (ret & MAX8925_CHG_STAT_MODE_MASK) >> 2;
308 switch (ret) {
309 case 1:
310 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
311 break;
312 case 0:
313 case 2:
314 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
315 break;
316 case 3:
317 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
318 break;
319 }
320 ret = 0;
321 break;
322 case POWER_SUPPLY_PROP_STATUS:
323 if (!info->bat_online) {
324 ret = -ENODATA;
325 break;
326 }
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;
332 } else
333 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
334 ret = 0;
335 break;
336 default:
337 ret = -ENODEV;
338 break;
339 }
340 return ret;
341}
342
343static 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,
349};
350
351#define REQUEST_IRQ(_irq, _name) \
352do { \
353 ret = request_threaded_irq(chip->irq_base + _irq, NULL, \
354 max8925_charger_handler, \
355 IRQF_ONESHOT, _name, info); \
356 if (ret) \
357 dev_err(chip->dev, "Failed to request IRQ #%d: %d\n", \
358 _irq, ret); \
359} while (0)
360
361static __devinit int max8925_init_charger(struct max8925_chip *chip,
362 struct max8925_power_info *info)
363{
364 int ret;
365
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");
380
381 info->ac_online = 0;
382 info->usb_online = 0;
383 info->bat_online = 0;
384 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
385 if (ret >= 0) {
386 /*
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.
391 */
392 if (info->batt_detect)
393 info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1;
394 else
395 info->bat_online = 1;
396 if (ret & MAX8925_CHG_AC_RANGE_MASK)
397 info->ac_online = 1;
398 else
399 info->ac_online = 0;
400 }
401 /* disable charge */
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);
408
409 return 0;
410}
411
412static __devexit int max8925_deinit_charger(struct max8925_power_info *info)
413{
414 struct max8925_chip *chip = info->chip;
415 int irq;
416
417 irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP;
418 for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++)
419 free_irq(irq, info);
420
421 return 0;
422}
423
424static __devinit int max8925_power_probe(struct platform_device *pdev)
425{
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;
430 int ret;
431
432 if (pdev->dev.parent->platform_data) {
433 max8925_pdata = pdev->dev.parent->platform_data;
434 pdata = max8925_pdata->power;
435 }
436
437 if (!pdata) {
438 dev_err(&pdev->dev, "platform data isn't assigned to "
439 "power supply\n");
440 return -EINVAL;
441 }
442
443 info = kzalloc(sizeof(struct max8925_power_info), GFP_KERNEL);
444 if (!info)
445 return -ENOMEM;
446 info->chip = chip;
447 info->gpm = chip->i2c;
448 info->adc = chip->adc;
449
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);
456 if (ret)
457 goto out;
458 info->ac.dev->parent = &pdev->dev;
459
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);
466 if (ret)
467 goto out_usb;
468 info->usb.dev->parent = &pdev->dev;
469
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);
476 if (ret)
477 goto out_battery;
478 info->battery.dev->parent = &pdev->dev;
479
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);
486
487 max8925_init_charger(chip, info);
488 return 0;
489out_battery:
490 power_supply_unregister(&info->battery);
491out_usb:
492 power_supply_unregister(&info->ac);
493out:
494 kfree(info);
495 return ret;
496}
497
498static __devexit int max8925_power_remove(struct platform_device *pdev)
499{
500 struct max8925_power_info *info = platform_get_drvdata(pdev);
501
502 if (info) {
503 power_supply_unregister(&info->ac);
504 power_supply_unregister(&info->usb);
505 power_supply_unregister(&info->battery);
506 max8925_deinit_charger(info);
507 kfree(info);
508 }
509 return 0;
510}
511
512static struct platform_driver max8925_power_driver = {
513 .probe = max8925_power_probe,
514 .remove = __devexit_p(max8925_power_remove),
515 .driver = {
516 .name = "max8925-power",
517 },
518};
519
520static int __init max8925_power_init(void)
521{
522 return platform_driver_register(&max8925_power_driver);
523}
524module_init(max8925_power_init);
525
526static void __exit max8925_power_exit(void)
527{
528 platform_driver_unregister(&max8925_power_driver);
529}
530module_exit(max8925_power_exit);
531
532MODULE_LICENSE("GPL");
533MODULE_DESCRIPTION("Power supply driver for MAX8925");
534MODULE_ALIAS("platform:max8925-power");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-21 22:40:57 -0500