1 /*
2 * intel_mid_battery.c - Intel MID PMIC Battery Driver
3 *
4 * Copyright (C) 2009 Intel Corporation
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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; version 2 of the License.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
20 *
21 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
22 * Author: Nithish Mahalingam <nithish.mahalingam@intel.com>
23 */
24
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/err.h>
28 #include <linux/interrupt.h>
29 #include <linux/workqueue.h>
30 #include <linux/jiffies.h>
31 #include <linux/param.h>
32 #include <linux/device.h>
33 #include <linux/spi/spi.h>
34 #include <linux/platform_device.h>
35 #include <linux/power_supply.h>
36
37 #include <asm/intel_scu_ipc.h>
38
39 #define DRIVER_NAME "pmic_battery"
40
41 /*********************************************************************
42 * Generic defines
43 *********************************************************************/
44
45 static int debug;
46 module_param(debug, int, 0444);
47 MODULE_PARM_DESC(debug, "Flag to enable PMIC Battery debug messages.");
48
49 #define PMIC_BATT_DRV_INFO_UPDATED 1
50 #define PMIC_BATT_PRESENT 1
51 #define PMIC_BATT_NOT_PRESENT 0
52 #define PMIC_USB_PRESENT PMIC_BATT_PRESENT
53 #define PMIC_USB_NOT_PRESENT PMIC_BATT_NOT_PRESENT
54
55 /* pmic battery register related */
56 #define PMIC_BATT_CHR_SCHRGINT_ADDR 0xD2
57 #define PMIC_BATT_CHR_SBATOVP_MASK (1 << 1)
58 #define PMIC_BATT_CHR_STEMP_MASK (1 << 2)
59 #define PMIC_BATT_CHR_SCOMP_MASK (1 << 3)
60 #define PMIC_BATT_CHR_SUSBDET_MASK (1 << 4)
61 #define PMIC_BATT_CHR_SBATDET_MASK (1 << 5)
62 #define PMIC_BATT_CHR_SDCLMT_MASK (1 << 6)
63 #define PMIC_BATT_CHR_SUSBOVP_MASK (1 << 7)
64 #define PMIC_BATT_CHR_EXCPT_MASK 0x86
65
66 #define PMIC_BATT_ADC_ACCCHRG_MASK (1 << 31)
67 #define PMIC_BATT_ADC_ACCCHRGVAL_MASK 0x7FFFFFFF
68
69 /* pmic ipc related */
70 #define PMIC_BATT_CHR_IPC_FCHRG_SUBID 0x4
71 #define PMIC_BATT_CHR_IPC_TCHRG_SUBID 0x6
72
73 /* types of battery charging */
74 enum batt_charge_type {
75 BATT_USBOTG_500MA_CHARGE,
76 BATT_USBOTG_TRICKLE_CHARGE,
77 };
78
79 /* valid battery events */
80 enum batt_event {
81 BATT_EVENT_BATOVP_EXCPT,
82 BATT_EVENT_USBOVP_EXCPT,
83 BATT_EVENT_TEMP_EXCPT,
84 BATT_EVENT_DCLMT_EXCPT,
85 BATT_EVENT_EXCPT
86 };
87
88
89 /*********************************************************************
90 * Battery properties
91 *********************************************************************/
92
93 /*
94 * pmic battery info
95 */
96 struct pmic_power_module_info {
97 bool is_dev_info_updated;
98 struct device *dev;
99 /* pmic battery data */
100 unsigned long update_time; /* jiffies when data read */
101 unsigned int usb_is_present;
102 unsigned int batt_is_present;
103 unsigned int batt_health;
104 unsigned int usb_health;
105 unsigned int batt_status;
106 unsigned int batt_charge_now; /* in mAS */
107 unsigned int batt_prev_charge_full; /* in mAS */
108 unsigned int batt_charge_rate; /* in units per second */
109
110 struct power_supply usb;
111 struct power_supply batt;
112 int irq; /* GPE_ID or IRQ# */
113 struct workqueue_struct *monitor_wqueue;
114 struct delayed_work monitor_battery;
115 struct work_struct handler;
116 };
117
118 static unsigned int delay_time = 2000; /* in ms */
119
120 /*
121 * pmic ac properties
122 */
123 static enum power_supply_property pmic_usb_props[] = {
124 POWER_SUPPLY_PROP_PRESENT,
125 POWER_SUPPLY_PROP_HEALTH,
126 };
127
128 /*
129 * pmic battery properties
130 */
131 static enum power_supply_property pmic_battery_props[] = {
132 POWER_SUPPLY_PROP_STATUS,
133 POWER_SUPPLY_PROP_HEALTH,
134 POWER_SUPPLY_PROP_PRESENT,
135 POWER_SUPPLY_PROP_CHARGE_NOW,
136 POWER_SUPPLY_PROP_CHARGE_FULL,
137 };
138
139
140 /*
141 * Glue functions for talking to the IPC
142 */
143
144 struct battery_property {
145 u32 capacity; /* Charger capacity */
146 u8 crnt; /* Quick charge current value*/
147 u8 volt; /* Fine adjustment of constant charge voltage */
148 u8 prot; /* CHRGPROT register value */
149 u8 prot2; /* CHRGPROT1 register value */
150 u8 timer; /* Charging timer */
151 };
152
153 #define IPCMSG_BATTERY 0xEF
154
155 /* Battery coulomb counter accumulator commands */
156 #define IPC_CMD_CC_WR 0 /* Update coulomb counter value */
157 #define IPC_CMD_CC_RD 1 /* Read coulomb counter value */
158 #define IPC_CMD_BATTERY_PROPERTY 2 /* Read Battery property */
159
160 /**
161 * pmic_scu_ipc_battery_cc_read - read battery cc
162 * @value: battery coulomb counter read
163 *
164 * Reads the battery couloumb counter value, returns 0 on success, or
165 * an error code
166 *
167 * This function may sleep. Locking for SCU accesses is handled for
168 * the caller.
169 */
pmic_scu_ipc_battery_cc_read(u32 * value)170 static int pmic_scu_ipc_battery_cc_read(u32 *value)
171 {
172 return intel_scu_ipc_command(IPCMSG_BATTERY, IPC_CMD_CC_RD,
173 NULL, 0, value, 1);
174 }
175
176 /**
177 * pmic_scu_ipc_battery_property_get - fetch properties
178 * @prop: battery properties
179 *
180 * Retrieve the battery properties from the power management
181 *
182 * This function may sleep. Locking for SCU accesses is handled for
183 * the caller.
184 */
pmic_scu_ipc_battery_property_get(struct battery_property * prop)185 static int pmic_scu_ipc_battery_property_get(struct battery_property *prop)
186 {
187 u32 data[3];
188 u8 *p = (u8 *)&data[1];
189 int err = intel_scu_ipc_command(IPCMSG_BATTERY,
190 IPC_CMD_BATTERY_PROPERTY, NULL, 0, data, 3);
191
192 prop->capacity = data[0];
193 prop->crnt = *p++;
194 prop->volt = *p++;
195 prop->prot = *p++;
196 prop->prot2 = *p++;
197 prop->timer = *p++;
198
199 return err;
200 }
201
202 /**
203 * pmic_scu_ipc_set_charger - set charger
204 * @charger: charger to select
205 *
206 * Switch the charging mode for the SCU
207 */
208
pmic_scu_ipc_set_charger(int charger)209 static int pmic_scu_ipc_set_charger(int charger)
210 {
211 return intel_scu_ipc_simple_command(IPCMSG_BATTERY, charger);
212 }
213
214 /**
215 * pmic_battery_log_event - log battery events
216 * @event: battery event to be logged
217 * Context: can sleep
218 *
219 * There are multiple battery events which may be of interest to users;
220 * this battery function logs the different battery events onto the
221 * kernel log messages.
222 */
pmic_battery_log_event(enum batt_event event)223 static void pmic_battery_log_event(enum batt_event event)
224 {
225 printk(KERN_WARNING "pmic-battery: ");
226 switch (event) {
227 case BATT_EVENT_BATOVP_EXCPT:
228 printk(KERN_CONT "battery overvoltage condition\n");
229 break;
230 case BATT_EVENT_USBOVP_EXCPT:
231 printk(KERN_CONT "usb charger overvoltage condition\n");
232 break;
233 case BATT_EVENT_TEMP_EXCPT:
234 printk(KERN_CONT "high battery temperature condition\n");
235 break;
236 case BATT_EVENT_DCLMT_EXCPT:
237 printk(KERN_CONT "over battery charge current condition\n");
238 break;
239 default:
240 printk(KERN_CONT "charger/battery exception %d\n", event);
241 break;
242 }
243 }
244
245 /**
246 * pmic_battery_read_status - read battery status information
247 * @pbi: device info structure to update the read information
248 * Context: can sleep
249 *
250 * PMIC power source information need to be updated based on the data read
251 * from the PMIC battery registers.
252 *
253 */
pmic_battery_read_status(struct pmic_power_module_info * pbi)254 static void pmic_battery_read_status(struct pmic_power_module_info *pbi)
255 {
256 unsigned int update_time_intrvl;
257 unsigned int chrg_val;
258 u32 ccval;
259 u8 r8;
260 struct battery_property batt_prop;
261 int batt_present = 0;
262 int usb_present = 0;
263 int batt_exception = 0;
264
265 /* make sure the last batt_status read happened delay_time before */
266 if (pbi->update_time && time_before(jiffies, pbi->update_time +
267 msecs_to_jiffies(delay_time)))
268 return;
269
270 update_time_intrvl = jiffies_to_msecs(jiffies - pbi->update_time);
271 pbi->update_time = jiffies;
272
273 /* read coulomb counter registers and schrgint register */
274 if (pmic_scu_ipc_battery_cc_read(&ccval)) {
275 dev_warn(pbi->dev, "%s(): ipc config cmd failed\n",
276 __func__);
277 return;
278 }
279
280 if (intel_scu_ipc_ioread8(PMIC_BATT_CHR_SCHRGINT_ADDR, &r8)) {
281 dev_warn(pbi->dev, "%s(): ipc pmic read failed\n",
282 __func__);
283 return;
284 }
285
286 /*
287 * set pmic_power_module_info members based on pmic register values
288 * read.
289 */
290
291 /* set batt_is_present */
292 if (r8 & PMIC_BATT_CHR_SBATDET_MASK) {
293 pbi->batt_is_present = PMIC_BATT_PRESENT;
294 batt_present = 1;
295 } else {
296 pbi->batt_is_present = PMIC_BATT_NOT_PRESENT;
297 pbi->batt_health = POWER_SUPPLY_HEALTH_UNKNOWN;
298 pbi->batt_status = POWER_SUPPLY_STATUS_UNKNOWN;
299 }
300
301 /* set batt_health */
302 if (batt_present) {
303 if (r8 & PMIC_BATT_CHR_SBATOVP_MASK) {
304 pbi->batt_health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
305 pbi->batt_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
306 pmic_battery_log_event(BATT_EVENT_BATOVP_EXCPT);
307 batt_exception = 1;
308 } else if (r8 & PMIC_BATT_CHR_STEMP_MASK) {
309 pbi->batt_health = POWER_SUPPLY_HEALTH_OVERHEAT;
310 pbi->batt_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
311 pmic_battery_log_event(BATT_EVENT_TEMP_EXCPT);
312 batt_exception = 1;
313 } else {
314 pbi->batt_health = POWER_SUPPLY_HEALTH_GOOD;
315 if (r8 & PMIC_BATT_CHR_SDCLMT_MASK) {
316 /* PMIC will change charging current automatically */
317 pmic_battery_log_event(BATT_EVENT_DCLMT_EXCPT);
318 }
319 }
320 }
321
322 /* set usb_is_present */
323 if (r8 & PMIC_BATT_CHR_SUSBDET_MASK) {
324 pbi->usb_is_present = PMIC_USB_PRESENT;
325 usb_present = 1;
326 } else {
327 pbi->usb_is_present = PMIC_USB_NOT_PRESENT;
328 pbi->usb_health = POWER_SUPPLY_HEALTH_UNKNOWN;
329 }
330
331 if (usb_present) {
332 if (r8 & PMIC_BATT_CHR_SUSBOVP_MASK) {
333 pbi->usb_health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
334 pmic_battery_log_event(BATT_EVENT_USBOVP_EXCPT);
335 } else {
336 pbi->usb_health = POWER_SUPPLY_HEALTH_GOOD;
337 }
338 }
339
340 chrg_val = ccval & PMIC_BATT_ADC_ACCCHRGVAL_MASK;
341
342 /* set batt_prev_charge_full to battery capacity the first time */
343 if (!pbi->is_dev_info_updated) {
344 if (pmic_scu_ipc_battery_property_get(&batt_prop)) {
345 dev_warn(pbi->dev, "%s(): ipc config cmd failed\n",
346 __func__);
347 return;
348 }
349 pbi->batt_prev_charge_full = batt_prop.capacity;
350 }
351
352 /* set batt_status */
353 if (batt_present && !batt_exception) {
354 if (r8 & PMIC_BATT_CHR_SCOMP_MASK) {
355 pbi->batt_status = POWER_SUPPLY_STATUS_FULL;
356 pbi->batt_prev_charge_full = chrg_val;
357 } else if (ccval & PMIC_BATT_ADC_ACCCHRG_MASK) {
358 pbi->batt_status = POWER_SUPPLY_STATUS_DISCHARGING;
359 } else {
360 pbi->batt_status = POWER_SUPPLY_STATUS_CHARGING;
361 }
362 }
363
364 /* set batt_charge_rate */
365 if (pbi->is_dev_info_updated && batt_present && !batt_exception) {
366 if (pbi->batt_status == POWER_SUPPLY_STATUS_DISCHARGING) {
367 if (pbi->batt_charge_now - chrg_val) {
368 pbi->batt_charge_rate = ((pbi->batt_charge_now -
369 chrg_val) * 1000 * 60) /
370 update_time_intrvl;
371 }
372 } else if (pbi->batt_status == POWER_SUPPLY_STATUS_CHARGING) {
373 if (chrg_val - pbi->batt_charge_now) {
374 pbi->batt_charge_rate = ((chrg_val -
375 pbi->batt_charge_now) * 1000 * 60) /
376 update_time_intrvl;
377 }
378 } else
379 pbi->batt_charge_rate = 0;
380 } else {
381 pbi->batt_charge_rate = -1;
382 }
383
384 /* batt_charge_now */
385 if (batt_present && !batt_exception)
386 pbi->batt_charge_now = chrg_val;
387 else
388 pbi->batt_charge_now = -1;
389
390 pbi->is_dev_info_updated = PMIC_BATT_DRV_INFO_UPDATED;
391 }
392
393 /**
394 * pmic_usb_get_property - usb power source get property
395 * @psy: usb power supply context
396 * @psp: usb power source property
397 * @val: usb power source property value
398 * Context: can sleep
399 *
400 * PMIC usb power source property needs to be provided to power_supply
401 * subsytem for it to provide the information to users.
402 */
pmic_usb_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)403 static int pmic_usb_get_property(struct power_supply *psy,
404 enum power_supply_property psp,
405 union power_supply_propval *val)
406 {
407 struct pmic_power_module_info *pbi = container_of(psy,
408 struct pmic_power_module_info, usb);
409
410 /* update pmic_power_module_info members */
411 pmic_battery_read_status(pbi);
412
413 switch (psp) {
414 case POWER_SUPPLY_PROP_PRESENT:
415 val->intval = pbi->usb_is_present;
416 break;
417 case POWER_SUPPLY_PROP_HEALTH:
418 val->intval = pbi->usb_health;
419 break;
420 default:
421 return -EINVAL;
422 }
423
424 return 0;
425 }
426
mAStouAh(unsigned long v)427 static inline unsigned long mAStouAh(unsigned long v)
428 {
429 /* seconds to hours, mA to µA */
430 return (v * 1000) / 3600;
431 }
432
433 /**
434 * pmic_battery_get_property - battery power source get property
435 * @psy: battery power supply context
436 * @psp: battery power source property
437 * @val: battery power source property value
438 * Context: can sleep
439 *
440 * PMIC battery power source property needs to be provided to power_supply
441 * subsytem for it to provide the information to users.
442 */
pmic_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)443 static int pmic_battery_get_property(struct power_supply *psy,
444 enum power_supply_property psp,
445 union power_supply_propval *val)
446 {
447 struct pmic_power_module_info *pbi = container_of(psy,
448 struct pmic_power_module_info, batt);
449
450 /* update pmic_power_module_info members */
451 pmic_battery_read_status(pbi);
452
453 switch (psp) {
454 case POWER_SUPPLY_PROP_STATUS:
455 val->intval = pbi->batt_status;
456 break;
457 case POWER_SUPPLY_PROP_HEALTH:
458 val->intval = pbi->batt_health;
459 break;
460 case POWER_SUPPLY_PROP_PRESENT:
461 val->intval = pbi->batt_is_present;
462 break;
463 case POWER_SUPPLY_PROP_CHARGE_NOW:
464 val->intval = mAStouAh(pbi->batt_charge_now);
465 break;
466 case POWER_SUPPLY_PROP_CHARGE_FULL:
467 val->intval = mAStouAh(pbi->batt_prev_charge_full);
468 break;
469 default:
470 return -EINVAL;
471 }
472
473 return 0;
474 }
475
476 /**
477 * pmic_battery_monitor - monitor battery status
478 * @work: work structure
479 * Context: can sleep
480 *
481 * PMIC battery status needs to be monitored for any change
482 * and information needs to be frequently updated.
483 */
pmic_battery_monitor(struct work_struct * work)484 static void pmic_battery_monitor(struct work_struct *work)
485 {
486 struct pmic_power_module_info *pbi = container_of(work,
487 struct pmic_power_module_info, monitor_battery.work);
488
489 /* update pmic_power_module_info members */
490 pmic_battery_read_status(pbi);
491 queue_delayed_work(pbi->monitor_wqueue, &pbi->monitor_battery, HZ * 10);
492 }
493
494 /**
495 * pmic_battery_set_charger - set battery charger
496 * @pbi: device info structure
497 * @chrg: charge mode to set battery charger in
498 * Context: can sleep
499 *
500 * PMIC battery charger needs to be enabled based on the usb charge
501 * capabilities connected to the platform.
502 */
pmic_battery_set_charger(struct pmic_power_module_info * pbi,enum batt_charge_type chrg)503 static int pmic_battery_set_charger(struct pmic_power_module_info *pbi,
504 enum batt_charge_type chrg)
505 {
506 int retval;
507
508 /* set usblmt bits and chrgcntl register bits appropriately */
509 switch (chrg) {
510 case BATT_USBOTG_500MA_CHARGE:
511 retval = pmic_scu_ipc_set_charger(PMIC_BATT_CHR_IPC_FCHRG_SUBID);
512 break;
513 case BATT_USBOTG_TRICKLE_CHARGE:
514 retval = pmic_scu_ipc_set_charger(PMIC_BATT_CHR_IPC_TCHRG_SUBID);
515 break;
516 default:
517 dev_warn(pbi->dev, "%s(): out of range usb charger "
518 "charge detected\n", __func__);
519 return -EINVAL;
520 }
521
522 if (retval) {
523 dev_warn(pbi->dev, "%s(): ipc pmic read failed\n",
524 __func__);
525 return retval;
526 }
527
528 return 0;
529 }
530
531 /**
532 * pmic_battery_interrupt_handler - pmic battery interrupt handler
533 * Context: interrupt context
534 *
535 * PMIC battery interrupt handler which will be called with either
536 * battery full condition occurs or usb otg & battery connect
537 * condition occurs.
538 */
pmic_battery_interrupt_handler(int id,void * dev)539 static irqreturn_t pmic_battery_interrupt_handler(int id, void *dev)
540 {
541 struct pmic_power_module_info *pbi = dev;
542
543 schedule_work(&pbi->handler);
544
545 return IRQ_HANDLED;
546 }
547
548 /**
549 * pmic_battery_handle_intrpt - pmic battery service interrupt
550 * @work: work structure
551 * Context: can sleep
552 *
553 * PMIC battery needs to either update the battery status as full
554 * if it detects battery full condition caused the interrupt or needs
555 * to enable battery charger if it detects usb and battery detect
556 * caused the source of interrupt.
557 */
pmic_battery_handle_intrpt(struct work_struct * work)558 static void pmic_battery_handle_intrpt(struct work_struct *work)
559 {
560 struct pmic_power_module_info *pbi = container_of(work,
561 struct pmic_power_module_info, handler);
562 enum batt_charge_type chrg;
563 u8 r8;
564
565 if (intel_scu_ipc_ioread8(PMIC_BATT_CHR_SCHRGINT_ADDR, &r8)) {
566 dev_warn(pbi->dev, "%s(): ipc pmic read failed\n",
567 __func__);
568 return;
569 }
570 /* find the cause of the interrupt */
571 if (r8 & PMIC_BATT_CHR_SBATDET_MASK) {
572 pbi->batt_is_present = PMIC_BATT_PRESENT;
573 } else {
574 pbi->batt_is_present = PMIC_BATT_NOT_PRESENT;
575 pbi->batt_health = POWER_SUPPLY_HEALTH_UNKNOWN;
576 pbi->batt_status = POWER_SUPPLY_STATUS_UNKNOWN;
577 return;
578 }
579
580 if (r8 & PMIC_BATT_CHR_EXCPT_MASK) {
581 pbi->batt_health = POWER_SUPPLY_HEALTH_UNKNOWN;
582 pbi->batt_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
583 pbi->usb_health = POWER_SUPPLY_HEALTH_UNKNOWN;
584 pmic_battery_log_event(BATT_EVENT_EXCPT);
585 return;
586 } else {
587 pbi->batt_health = POWER_SUPPLY_HEALTH_GOOD;
588 pbi->usb_health = POWER_SUPPLY_HEALTH_GOOD;
589 }
590
591 if (r8 & PMIC_BATT_CHR_SCOMP_MASK) {
592 u32 ccval;
593 pbi->batt_status = POWER_SUPPLY_STATUS_FULL;
594
595 if (pmic_scu_ipc_battery_cc_read(&ccval)) {
596 dev_warn(pbi->dev, "%s(): ipc config cmd "
597 "failed\n", __func__);
598 return;
599 }
600 pbi->batt_prev_charge_full = ccval &
601 PMIC_BATT_ADC_ACCCHRGVAL_MASK;
602 return;
603 }
604
605 if (r8 & PMIC_BATT_CHR_SUSBDET_MASK) {
606 pbi->usb_is_present = PMIC_USB_PRESENT;
607 } else {
608 pbi->usb_is_present = PMIC_USB_NOT_PRESENT;
609 pbi->usb_health = POWER_SUPPLY_HEALTH_UNKNOWN;
610 return;
611 }
612
613 /* setup battery charging */
614
615 #if 0
616 /* check usb otg power capability and set charger accordingly */
617 retval = langwell_udc_maxpower(&power);
618 if (retval) {
619 dev_warn(pbi->dev,
620 "%s(): usb otg power query failed with error code %d\n",
621 __func__, retval);
622 return;
623 }
624
625 if (power >= 500)
626 chrg = BATT_USBOTG_500MA_CHARGE;
627 else
628 #endif
629 chrg = BATT_USBOTG_TRICKLE_CHARGE;
630
631 /* enable battery charging */
632 if (pmic_battery_set_charger(pbi, chrg)) {
633 dev_warn(pbi->dev,
634 "%s(): failed to set up battery charging\n", __func__);
635 return;
636 }
637
638 dev_dbg(pbi->dev,
639 "pmic-battery: %s() - setting up battery charger successful\n",
640 __func__);
641 }
642
643 /**
644 * pmic_battery_probe - pmic battery initialize
645 * @irq: pmic battery device irq
646 * @dev: pmic battery device structure
647 * Context: can sleep
648 *
649 * PMIC battery initializes its internal data structue and other
650 * infrastructure components for it to work as expected.
651 */
probe(int irq,struct device * dev)652 static __devinit int probe(int irq, struct device *dev)
653 {
654 int retval = 0;
655 struct pmic_power_module_info *pbi;
656
657 dev_dbg(dev, "pmic-battery: found pmic battery device\n");
658
659 pbi = kzalloc(sizeof(*pbi), GFP_KERNEL);
660 if (!pbi) {
661 dev_err(dev, "%s(): memory allocation failed\n",
662 __func__);
663 return -ENOMEM;
664 }
665
666 pbi->dev = dev;
667 pbi->irq = irq;
668 dev_set_drvdata(dev, pbi);
669
670 /* initialize all required framework before enabling interrupts */
671 INIT_WORK(&pbi->handler, pmic_battery_handle_intrpt);
672 INIT_DELAYED_WORK(&pbi->monitor_battery, pmic_battery_monitor);
673 pbi->monitor_wqueue =
674 create_singlethread_workqueue(dev_name(dev));
675 if (!pbi->monitor_wqueue) {
676 dev_err(dev, "%s(): wqueue init failed\n", __func__);
677 retval = -ESRCH;
678 goto wqueue_failed;
679 }
680
681 /* register interrupt */
682 retval = request_irq(pbi->irq, pmic_battery_interrupt_handler,
683 0, DRIVER_NAME, pbi);
684 if (retval) {
685 dev_err(dev, "%s(): cannot get IRQ\n", __func__);
686 goto requestirq_failed;
687 }
688
689 /* register pmic-batt with power supply subsystem */
690 pbi->batt.name = "pmic-batt";
691 pbi->batt.type = POWER_SUPPLY_TYPE_BATTERY;
692 pbi->batt.properties = pmic_battery_props;
693 pbi->batt.num_properties = ARRAY_SIZE(pmic_battery_props);
694 pbi->batt.get_property = pmic_battery_get_property;
695 retval = power_supply_register(dev, &pbi->batt);
696 if (retval) {
697 dev_err(dev,
698 "%s(): failed to register pmic battery device with power supply subsystem\n",
699 __func__);
700 goto power_reg_failed;
701 }
702
703 dev_dbg(dev, "pmic-battery: %s() - pmic battery device "
704 "registration with power supply subsystem successful\n",
705 __func__);
706
707 queue_delayed_work(pbi->monitor_wqueue, &pbi->monitor_battery, HZ * 1);
708
709 /* register pmic-usb with power supply subsystem */
710 pbi->usb.name = "pmic-usb";
711 pbi->usb.type = POWER_SUPPLY_TYPE_USB;
712 pbi->usb.properties = pmic_usb_props;
713 pbi->usb.num_properties = ARRAY_SIZE(pmic_usb_props);
714 pbi->usb.get_property = pmic_usb_get_property;
715 retval = power_supply_register(dev, &pbi->usb);
716 if (retval) {
717 dev_err(dev,
718 "%s(): failed to register pmic usb device with power supply subsystem\n",
719 __func__);
720 goto power_reg_failed_1;
721 }
722
723 if (debug)
724 printk(KERN_INFO "pmic-battery: %s() - pmic usb device "
725 "registration with power supply subsystem successful\n",
726 __func__);
727
728 return retval;
729
730 power_reg_failed_1:
731 power_supply_unregister(&pbi->batt);
732 power_reg_failed:
733 cancel_delayed_work_sync(&pbi->monitor_battery);
734 requestirq_failed:
735 destroy_workqueue(pbi->monitor_wqueue);
736 wqueue_failed:
737 kfree(pbi);
738
739 return retval;
740 }
741
platform_pmic_battery_probe(struct platform_device * pdev)742 static int __devinit platform_pmic_battery_probe(struct platform_device *pdev)
743 {
744 return probe(pdev->id, &pdev->dev);
745 }
746
747 /**
748 * pmic_battery_remove - pmic battery finalize
749 * @dev: pmic battery device structure
750 * Context: can sleep
751 *
752 * PMIC battery finalizes its internal data structue and other
753 * infrastructure components that it initialized in
754 * pmic_battery_probe.
755 */
756
platform_pmic_battery_remove(struct platform_device * pdev)757 static int __devexit platform_pmic_battery_remove(struct platform_device *pdev)
758 {
759 struct pmic_power_module_info *pbi = dev_get_drvdata(&pdev->dev);
760
761 free_irq(pbi->irq, pbi);
762 cancel_delayed_work_sync(&pbi->monitor_battery);
763 destroy_workqueue(pbi->monitor_wqueue);
764
765 power_supply_unregister(&pbi->usb);
766 power_supply_unregister(&pbi->batt);
767
768 cancel_work_sync(&pbi->handler);
769 kfree(pbi);
770 return 0;
771 }
772
773 static struct platform_driver platform_pmic_battery_driver = {
774 .driver = {
775 .name = DRIVER_NAME,
776 .owner = THIS_MODULE,
777 },
778 .probe = platform_pmic_battery_probe,
779 .remove = __devexit_p(platform_pmic_battery_remove),
780 };
781
782 module_platform_driver(platform_pmic_battery_driver);
783
784 MODULE_AUTHOR("Nithish Mahalingam <nithish.mahalingam@intel.com>");
785 MODULE_DESCRIPTION("Intel Moorestown PMIC Battery Driver");
786 MODULE_LICENSE("GPL");
787