mfd: ab8500 chip revision 3.0 support
[linux-2.6.git] / drivers / mfd / ab8500-core.c
1 /*
2  * Copyright (C) ST-Ericsson SA 2010
3  *
4  * License Terms: GNU General Public License v2
5  * Author: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
6  * Author: Rabin Vincent <rabin.vincent@stericsson.com>
7  * Author: Mattias Wallin <mattias.wallin@stericsson.com>
8  */
9
10 #include <linux/kernel.h>
11 #include <linux/slab.h>
12 #include <linux/init.h>
13 #include <linux/irq.h>
14 #include <linux/delay.h>
15 #include <linux/interrupt.h>
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/mfd/core.h>
19 #include <linux/mfd/abx500.h>
20 #include <linux/mfd/ab8500.h>
21 #include <linux/regulator/ab8500.h>
22
23 /*
24  * Interrupt register offsets
25  * Bank : 0x0E
26  */
27 #define AB8500_IT_SOURCE1_REG           0x00
28 #define AB8500_IT_SOURCE2_REG           0x01
29 #define AB8500_IT_SOURCE3_REG           0x02
30 #define AB8500_IT_SOURCE4_REG           0x03
31 #define AB8500_IT_SOURCE5_REG           0x04
32 #define AB8500_IT_SOURCE6_REG           0x05
33 #define AB8500_IT_SOURCE7_REG           0x06
34 #define AB8500_IT_SOURCE8_REG           0x07
35 #define AB8500_IT_SOURCE19_REG          0x12
36 #define AB8500_IT_SOURCE20_REG          0x13
37 #define AB8500_IT_SOURCE21_REG          0x14
38 #define AB8500_IT_SOURCE22_REG          0x15
39 #define AB8500_IT_SOURCE23_REG          0x16
40 #define AB8500_IT_SOURCE24_REG          0x17
41
42 /*
43  * latch registers
44  */
45 #define AB8500_IT_LATCH1_REG            0x20
46 #define AB8500_IT_LATCH2_REG            0x21
47 #define AB8500_IT_LATCH3_REG            0x22
48 #define AB8500_IT_LATCH4_REG            0x23
49 #define AB8500_IT_LATCH5_REG            0x24
50 #define AB8500_IT_LATCH6_REG            0x25
51 #define AB8500_IT_LATCH7_REG            0x26
52 #define AB8500_IT_LATCH8_REG            0x27
53 #define AB8500_IT_LATCH9_REG            0x28
54 #define AB8500_IT_LATCH10_REG           0x29
55 #define AB8500_IT_LATCH12_REG           0x2B
56 #define AB8500_IT_LATCH19_REG           0x32
57 #define AB8500_IT_LATCH20_REG           0x33
58 #define AB8500_IT_LATCH21_REG           0x34
59 #define AB8500_IT_LATCH22_REG           0x35
60 #define AB8500_IT_LATCH23_REG           0x36
61 #define AB8500_IT_LATCH24_REG           0x37
62
63 /*
64  * mask registers
65  */
66
67 #define AB8500_IT_MASK1_REG             0x40
68 #define AB8500_IT_MASK2_REG             0x41
69 #define AB8500_IT_MASK3_REG             0x42
70 #define AB8500_IT_MASK4_REG             0x43
71 #define AB8500_IT_MASK5_REG             0x44
72 #define AB8500_IT_MASK6_REG             0x45
73 #define AB8500_IT_MASK7_REG             0x46
74 #define AB8500_IT_MASK8_REG             0x47
75 #define AB8500_IT_MASK9_REG             0x48
76 #define AB8500_IT_MASK10_REG            0x49
77 #define AB8500_IT_MASK11_REG            0x4A
78 #define AB8500_IT_MASK12_REG            0x4B
79 #define AB8500_IT_MASK13_REG            0x4C
80 #define AB8500_IT_MASK14_REG            0x4D
81 #define AB8500_IT_MASK15_REG            0x4E
82 #define AB8500_IT_MASK16_REG            0x4F
83 #define AB8500_IT_MASK17_REG            0x50
84 #define AB8500_IT_MASK18_REG            0x51
85 #define AB8500_IT_MASK19_REG            0x52
86 #define AB8500_IT_MASK20_REG            0x53
87 #define AB8500_IT_MASK21_REG            0x54
88 #define AB8500_IT_MASK22_REG            0x55
89 #define AB8500_IT_MASK23_REG            0x56
90 #define AB8500_IT_MASK24_REG            0x57
91
92 #define AB8500_REV_REG                  0x80
93
94 /*
95  * Map interrupt numbers to the LATCH and MASK register offsets, Interrupt
96  * numbers are indexed into this array with (num / 8).
97  *
98  * This is one off from the register names, i.e. AB8500_IT_MASK1_REG is at
99  * offset 0.
100  */
101 static const int ab8500_irq_regoffset[AB8500_NUM_IRQ_REGS] = {
102         0, 1, 2, 3, 4, 6, 7, 8, 9, 11, 18, 19, 20, 21,
103 };
104
105 static int ab8500_get_chip_id(struct device *dev)
106 {
107         struct ab8500 *ab8500;
108
109         if (!dev)
110                 return -EINVAL;
111         ab8500 = dev_get_drvdata(dev->parent);
112         return ab8500 ? (int)ab8500->chip_id : -EINVAL;
113 }
114
115 static int set_register_interruptible(struct ab8500 *ab8500, u8 bank,
116         u8 reg, u8 data)
117 {
118         int ret;
119         /*
120          * Put the u8 bank and u8 register together into a an u16.
121          * The bank on higher 8 bits and register in lower 8 bits.
122          * */
123         u16 addr = ((u16)bank) << 8 | reg;
124
125         dev_vdbg(ab8500->dev, "wr: addr %#x <= %#x\n", addr, data);
126
127         ret = mutex_lock_interruptible(&ab8500->lock);
128         if (ret)
129                 return ret;
130
131         ret = ab8500->write(ab8500, addr, data);
132         if (ret < 0)
133                 dev_err(ab8500->dev, "failed to write reg %#x: %d\n",
134                         addr, ret);
135         mutex_unlock(&ab8500->lock);
136
137         return ret;
138 }
139
140 static int ab8500_set_register(struct device *dev, u8 bank,
141         u8 reg, u8 value)
142 {
143         struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);
144
145         return set_register_interruptible(ab8500, bank, reg, value);
146 }
147
148 static int get_register_interruptible(struct ab8500 *ab8500, u8 bank,
149         u8 reg, u8 *value)
150 {
151         int ret;
152         /* put the u8 bank and u8 reg together into a an u16.
153          * bank on higher 8 bits and reg in lower */
154         u16 addr = ((u16)bank) << 8 | reg;
155
156         ret = mutex_lock_interruptible(&ab8500->lock);
157         if (ret)
158                 return ret;
159
160         ret = ab8500->read(ab8500, addr);
161         if (ret < 0)
162                 dev_err(ab8500->dev, "failed to read reg %#x: %d\n",
163                         addr, ret);
164         else
165                 *value = ret;
166
167         mutex_unlock(&ab8500->lock);
168         dev_vdbg(ab8500->dev, "rd: addr %#x => data %#x\n", addr, ret);
169
170         return ret;
171 }
172
173 static int ab8500_get_register(struct device *dev, u8 bank,
174         u8 reg, u8 *value)
175 {
176         struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);
177
178         return get_register_interruptible(ab8500, bank, reg, value);
179 }
180
181 static int mask_and_set_register_interruptible(struct ab8500 *ab8500, u8 bank,
182         u8 reg, u8 bitmask, u8 bitvalues)
183 {
184         int ret;
185         u8 data;
186         /* put the u8 bank and u8 reg together into a an u16.
187          * bank on higher 8 bits and reg in lower */
188         u16 addr = ((u16)bank) << 8 | reg;
189
190         ret = mutex_lock_interruptible(&ab8500->lock);
191         if (ret)
192                 return ret;
193
194         ret = ab8500->read(ab8500, addr);
195         if (ret < 0) {
196                 dev_err(ab8500->dev, "failed to read reg %#x: %d\n",
197                         addr, ret);
198                 goto out;
199         }
200
201         data = (u8)ret;
202         data = (~bitmask & data) | (bitmask & bitvalues);
203
204         ret = ab8500->write(ab8500, addr, data);
205         if (ret < 0)
206                 dev_err(ab8500->dev, "failed to write reg %#x: %d\n",
207                         addr, ret);
208
209         dev_vdbg(ab8500->dev, "mask: addr %#x => data %#x\n", addr, data);
210 out:
211         mutex_unlock(&ab8500->lock);
212         return ret;
213 }
214
215 static int ab8500_mask_and_set_register(struct device *dev,
216         u8 bank, u8 reg, u8 bitmask, u8 bitvalues)
217 {
218         struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);
219
220         return mask_and_set_register_interruptible(ab8500, bank, reg,
221                 bitmask, bitvalues);
222
223 }
224
225 static struct abx500_ops ab8500_ops = {
226         .get_chip_id = ab8500_get_chip_id,
227         .get_register = ab8500_get_register,
228         .set_register = ab8500_set_register,
229         .get_register_page = NULL,
230         .set_register_page = NULL,
231         .mask_and_set_register = ab8500_mask_and_set_register,
232         .event_registers_startup_state_get = NULL,
233         .startup_irq_enabled = NULL,
234 };
235
236 static void ab8500_irq_lock(struct irq_data *data)
237 {
238         struct ab8500 *ab8500 = irq_data_get_irq_chip_data(data);
239
240         mutex_lock(&ab8500->irq_lock);
241 }
242
243 static void ab8500_irq_sync_unlock(struct irq_data *data)
244 {
245         struct ab8500 *ab8500 = irq_data_get_irq_chip_data(data);
246         int i;
247
248         for (i = 0; i < AB8500_NUM_IRQ_REGS; i++) {
249                 u8 old = ab8500->oldmask[i];
250                 u8 new = ab8500->mask[i];
251                 int reg;
252
253                 if (new == old)
254                         continue;
255
256                 /* Interrupt register 12 does'nt exist prior to version 0x20 */
257                 if (ab8500_irq_regoffset[i] == 11 && ab8500->chip_id < 0x20)
258                         continue;
259
260                 ab8500->oldmask[i] = new;
261
262                 reg = AB8500_IT_MASK1_REG + ab8500_irq_regoffset[i];
263                 set_register_interruptible(ab8500, AB8500_INTERRUPT, reg, new);
264         }
265
266         mutex_unlock(&ab8500->irq_lock);
267 }
268
269 static void ab8500_irq_mask(struct irq_data *data)
270 {
271         struct ab8500 *ab8500 = irq_data_get_irq_chip_data(data);
272         int offset = data->irq - ab8500->irq_base;
273         int index = offset / 8;
274         int mask = 1 << (offset % 8);
275
276         ab8500->mask[index] |= mask;
277 }
278
279 static void ab8500_irq_unmask(struct irq_data *data)
280 {
281         struct ab8500 *ab8500 = irq_data_get_irq_chip_data(data);
282         int offset = data->irq - ab8500->irq_base;
283         int index = offset / 8;
284         int mask = 1 << (offset % 8);
285
286         ab8500->mask[index] &= ~mask;
287 }
288
289 static struct irq_chip ab8500_irq_chip = {
290         .name                   = "ab8500",
291         .irq_bus_lock           = ab8500_irq_lock,
292         .irq_bus_sync_unlock    = ab8500_irq_sync_unlock,
293         .irq_mask               = ab8500_irq_mask,
294         .irq_unmask             = ab8500_irq_unmask,
295 };
296
297 static irqreturn_t ab8500_irq(int irq, void *dev)
298 {
299         struct ab8500 *ab8500 = dev;
300         int i;
301
302         dev_vdbg(ab8500->dev, "interrupt\n");
303
304         for (i = 0; i < AB8500_NUM_IRQ_REGS; i++) {
305                 int regoffset = ab8500_irq_regoffset[i];
306                 int status;
307                 u8 value;
308
309                 /* Interrupt register 12 does'nt exist prior to version 0x20 */
310                 if (regoffset == 11 && ab8500->chip_id < 0x20)
311                         continue;
312
313                 status = get_register_interruptible(ab8500, AB8500_INTERRUPT,
314                         AB8500_IT_LATCH1_REG + regoffset, &value);
315                 if (status < 0 || value == 0)
316                         continue;
317
318                 do {
319                         int bit = __ffs(value);
320                         int line = i * 8 + bit;
321
322                         handle_nested_irq(ab8500->irq_base + line);
323                         value &= ~(1 << bit);
324                 } while (value);
325         }
326
327         return IRQ_HANDLED;
328 }
329
330 static int ab8500_irq_init(struct ab8500 *ab8500)
331 {
332         int base = ab8500->irq_base;
333         int irq;
334
335         for (irq = base; irq < base + AB8500_NR_IRQS; irq++) {
336                 set_irq_chip_data(irq, ab8500);
337                 set_irq_chip_and_handler(irq, &ab8500_irq_chip,
338                                          handle_simple_irq);
339                 set_irq_nested_thread(irq, 1);
340 #ifdef CONFIG_ARM
341                 set_irq_flags(irq, IRQF_VALID);
342 #else
343                 set_irq_noprobe(irq);
344 #endif
345         }
346
347         return 0;
348 }
349
350 static void ab8500_irq_remove(struct ab8500 *ab8500)
351 {
352         int base = ab8500->irq_base;
353         int irq;
354
355         for (irq = base; irq < base + AB8500_NR_IRQS; irq++) {
356 #ifdef CONFIG_ARM
357                 set_irq_flags(irq, 0);
358 #endif
359                 set_irq_chip_and_handler(irq, NULL, NULL);
360                 set_irq_chip_data(irq, NULL);
361         }
362 }
363
364 static struct resource ab8500_gpadc_resources[] = {
365         {
366                 .name   = "HW_CONV_END",
367                 .start  = AB8500_INT_GP_HW_ADC_CONV_END,
368                 .end    = AB8500_INT_GP_HW_ADC_CONV_END,
369                 .flags  = IORESOURCE_IRQ,
370         },
371         {
372                 .name   = "SW_CONV_END",
373                 .start  = AB8500_INT_GP_SW_ADC_CONV_END,
374                 .end    = AB8500_INT_GP_SW_ADC_CONV_END,
375                 .flags  = IORESOURCE_IRQ,
376         },
377 };
378
379 static struct resource ab8500_rtc_resources[] = {
380         {
381                 .name   = "60S",
382                 .start  = AB8500_INT_RTC_60S,
383                 .end    = AB8500_INT_RTC_60S,
384                 .flags  = IORESOURCE_IRQ,
385         },
386         {
387                 .name   = "ALARM",
388                 .start  = AB8500_INT_RTC_ALARM,
389                 .end    = AB8500_INT_RTC_ALARM,
390                 .flags  = IORESOURCE_IRQ,
391         },
392 };
393
394 static struct resource ab8500_poweronkey_db_resources[] = {
395         {
396                 .name   = "ONKEY_DBF",
397                 .start  = AB8500_INT_PON_KEY1DB_F,
398                 .end    = AB8500_INT_PON_KEY1DB_F,
399                 .flags  = IORESOURCE_IRQ,
400         },
401         {
402                 .name   = "ONKEY_DBR",
403                 .start  = AB8500_INT_PON_KEY1DB_R,
404                 .end    = AB8500_INT_PON_KEY1DB_R,
405                 .flags  = IORESOURCE_IRQ,
406         },
407 };
408
409 static struct resource ab8500_bm_resources[] = {
410         {
411                 .name = "MAIN_EXT_CH_NOT_OK",
412                 .start = AB8500_INT_MAIN_EXT_CH_NOT_OK,
413                 .end = AB8500_INT_MAIN_EXT_CH_NOT_OK,
414                 .flags = IORESOURCE_IRQ,
415         },
416         {
417                 .name = "BATT_OVV",
418                 .start = AB8500_INT_BATT_OVV,
419                 .end = AB8500_INT_BATT_OVV,
420                 .flags = IORESOURCE_IRQ,
421         },
422         {
423                 .name = "MAIN_CH_UNPLUG_DET",
424                 .start = AB8500_INT_MAIN_CH_UNPLUG_DET,
425                 .end = AB8500_INT_MAIN_CH_UNPLUG_DET,
426                 .flags = IORESOURCE_IRQ,
427         },
428         {
429                 .name = "MAIN_CHARGE_PLUG_DET",
430                 .start = AB8500_INT_MAIN_CH_PLUG_DET,
431                 .end = AB8500_INT_MAIN_CH_PLUG_DET,
432                 .flags = IORESOURCE_IRQ,
433         },
434         {
435                 .name = "VBUS_DET_F",
436                 .start = AB8500_INT_VBUS_DET_F,
437                 .end = AB8500_INT_VBUS_DET_F,
438                 .flags = IORESOURCE_IRQ,
439         },
440         {
441                 .name = "VBUS_DET_R",
442                 .start = AB8500_INT_VBUS_DET_R,
443                 .end = AB8500_INT_VBUS_DET_R,
444                 .flags = IORESOURCE_IRQ,
445         },
446         {
447                 .name = "BAT_CTRL_INDB",
448                 .start = AB8500_INT_BAT_CTRL_INDB,
449                 .end = AB8500_INT_BAT_CTRL_INDB,
450                 .flags = IORESOURCE_IRQ,
451         },
452         {
453                 .name = "CH_WD_EXP",
454                 .start = AB8500_INT_CH_WD_EXP,
455                 .end = AB8500_INT_CH_WD_EXP,
456                 .flags = IORESOURCE_IRQ,
457         },
458         {
459                 .name = "VBUS_OVV",
460                 .start = AB8500_INT_VBUS_OVV,
461                 .end = AB8500_INT_VBUS_OVV,
462                 .flags = IORESOURCE_IRQ,
463         },
464         {
465                 .name = "NCONV_ACCU",
466                 .start = AB8500_INT_CCN_CONV_ACC,
467                 .end = AB8500_INT_CCN_CONV_ACC,
468                 .flags = IORESOURCE_IRQ,
469         },
470         {
471                 .name = "LOW_BAT_F",
472                 .start = AB8500_INT_LOW_BAT_F,
473                 .end = AB8500_INT_LOW_BAT_F,
474                 .flags = IORESOURCE_IRQ,
475         },
476         {
477                 .name = "LOW_BAT_R",
478                 .start = AB8500_INT_LOW_BAT_R,
479                 .end = AB8500_INT_LOW_BAT_R,
480                 .flags = IORESOURCE_IRQ,
481         },
482         {
483                 .name = "BTEMP_LOW",
484                 .start = AB8500_INT_BTEMP_LOW,
485                 .end = AB8500_INT_BTEMP_LOW,
486                 .flags = IORESOURCE_IRQ,
487         },
488         {
489                 .name = "BTEMP_HIGH",
490                 .start = AB8500_INT_BTEMP_HIGH,
491                 .end = AB8500_INT_BTEMP_HIGH,
492                 .flags = IORESOURCE_IRQ,
493         },
494         {
495                 .name = "USB_CHARGER_NOT_OKR",
496                 .start = AB8500_INT_USB_CHARGER_NOT_OK,
497                 .end = AB8500_INT_USB_CHARGER_NOT_OK,
498                 .flags = IORESOURCE_IRQ,
499         },
500         {
501                 .name = "USB_CHARGE_DET_DONE",
502                 .start = AB8500_INT_USB_CHG_DET_DONE,
503                 .end = AB8500_INT_USB_CHG_DET_DONE,
504                 .flags = IORESOURCE_IRQ,
505         },
506         {
507                 .name = "USB_CH_TH_PROT_R",
508                 .start = AB8500_INT_USB_CH_TH_PROT_R,
509                 .end = AB8500_INT_USB_CH_TH_PROT_R,
510                 .flags = IORESOURCE_IRQ,
511         },
512         {
513                 .name = "MAIN_CH_TH_PROT_R",
514                 .start = AB8500_INT_MAIN_CH_TH_PROT_R,
515                 .end = AB8500_INT_MAIN_CH_TH_PROT_R,
516                 .flags = IORESOURCE_IRQ,
517         },
518         {
519                 .name = "USB_CHARGER_NOT_OKF",
520                 .start = AB8500_INT_USB_CHARGER_NOT_OKF,
521                 .end = AB8500_INT_USB_CHARGER_NOT_OKF,
522                 .flags = IORESOURCE_IRQ,
523         },
524 };
525
526 static struct resource ab8500_debug_resources[] = {
527         {
528                 .name   = "IRQ_FIRST",
529                 .start  = AB8500_INT_MAIN_EXT_CH_NOT_OK,
530                 .end    = AB8500_INT_MAIN_EXT_CH_NOT_OK,
531                 .flags  = IORESOURCE_IRQ,
532         },
533         {
534                 .name   = "IRQ_LAST",
535                 .start  = AB8500_INT_USB_CHARGER_NOT_OKF,
536                 .end    = AB8500_INT_USB_CHARGER_NOT_OKF,
537                 .flags  = IORESOURCE_IRQ,
538         },
539 };
540
541 static struct resource ab8500_usb_resources[] = {
542         {
543                 .name = "ID_WAKEUP_R",
544                 .start = AB8500_INT_ID_WAKEUP_R,
545                 .end = AB8500_INT_ID_WAKEUP_R,
546                 .flags = IORESOURCE_IRQ,
547         },
548         {
549                 .name = "ID_WAKEUP_F",
550                 .start = AB8500_INT_ID_WAKEUP_F,
551                 .end = AB8500_INT_ID_WAKEUP_F,
552                 .flags = IORESOURCE_IRQ,
553         },
554         {
555                 .name = "VBUS_DET_F",
556                 .start = AB8500_INT_VBUS_DET_F,
557                 .end = AB8500_INT_VBUS_DET_F,
558                 .flags = IORESOURCE_IRQ,
559         },
560         {
561                 .name = "VBUS_DET_R",
562                 .start = AB8500_INT_VBUS_DET_R,
563                 .end = AB8500_INT_VBUS_DET_R,
564                 .flags = IORESOURCE_IRQ,
565         },
566         {
567                 .name = "USB_LINK_STATUS",
568                 .start = AB8500_INT_USB_LINK_STATUS,
569                 .end = AB8500_INT_USB_LINK_STATUS,
570                 .flags = IORESOURCE_IRQ,
571         },
572 };
573
574 static struct resource ab8500_temp_resources[] = {
575         {
576                 .name  = "AB8500_TEMP_WARM",
577                 .start = AB8500_INT_TEMP_WARM,
578                 .end   = AB8500_INT_TEMP_WARM,
579                 .flags = IORESOURCE_IRQ,
580         },
581 };
582
583 static struct mfd_cell ab8500_devs[] = {
584 #ifdef CONFIG_DEBUG_FS
585         {
586                 .name = "ab8500-debug",
587                 .num_resources = ARRAY_SIZE(ab8500_debug_resources),
588                 .resources = ab8500_debug_resources,
589         },
590 #endif
591         {
592                 .name = "ab8500-sysctrl",
593         },
594         {
595                 .name = "ab8500-regulator",
596         },
597         {
598                 .name = "ab8500-gpadc",
599                 .num_resources = ARRAY_SIZE(ab8500_gpadc_resources),
600                 .resources = ab8500_gpadc_resources,
601         },
602         {
603                 .name = "ab8500-rtc",
604                 .num_resources = ARRAY_SIZE(ab8500_rtc_resources),
605                 .resources = ab8500_rtc_resources,
606         },
607         {
608                 .name = "ab8500-bm",
609                 .num_resources = ARRAY_SIZE(ab8500_bm_resources),
610                 .resources = ab8500_bm_resources,
611         },
612         { .name = "ab8500-codec", },
613         {
614                 .name = "ab8500-usb",
615                 .num_resources = ARRAY_SIZE(ab8500_usb_resources),
616                 .resources = ab8500_usb_resources,
617         },
618         {
619                 .name = "ab8500-poweron-key",
620                 .num_resources = ARRAY_SIZE(ab8500_poweronkey_db_resources),
621                 .resources = ab8500_poweronkey_db_resources,
622         },
623         {
624                 .name = "ab8500-pwm",
625                 .id = 1,
626         },
627         {
628                 .name = "ab8500-pwm",
629                 .id = 2,
630         },
631         {
632                 .name = "ab8500-pwm",
633                 .id = 3,
634         },
635         { .name = "ab8500-leds", },
636         {
637                 .name = "ab8500-denc",
638         },
639         {
640                 .name = "ab8500-temp",
641                 .num_resources = ARRAY_SIZE(ab8500_temp_resources),
642                 .resources = ab8500_temp_resources,
643         },
644 };
645
646 static ssize_t show_chip_id(struct device *dev,
647                                 struct device_attribute *attr, char *buf)
648 {
649         struct ab8500 *ab8500;
650
651         ab8500 = dev_get_drvdata(dev);
652         return sprintf(buf, "%#x\n", ab8500 ? ab8500->chip_id : -EINVAL);
653 }
654
655 static DEVICE_ATTR(chip_id, S_IRUGO, show_chip_id, NULL);
656
657 static struct attribute *ab8500_sysfs_entries[] = {
658         &dev_attr_chip_id.attr,
659         NULL,
660 };
661
662 static struct attribute_group ab8500_attr_group = {
663         .attrs  = ab8500_sysfs_entries,
664 };
665
666 int __devinit ab8500_init(struct ab8500 *ab8500)
667 {
668         struct ab8500_platform_data *plat = dev_get_platdata(ab8500->dev);
669         int ret;
670         int i;
671         u8 value;
672
673         if (plat)
674                 ab8500->irq_base = plat->irq_base;
675
676         mutex_init(&ab8500->lock);
677         mutex_init(&ab8500->irq_lock);
678
679         ret = get_register_interruptible(ab8500, AB8500_MISC,
680                 AB8500_REV_REG, &value);
681         if (ret < 0)
682                 return ret;
683
684         /*
685          * 0x0 - Early Drop
686          * 0x10 - Cut 1.0
687          * 0x11 - Cut 1.1
688          * 0x20 - Cut 2.0
689          * 0x30 - Cut 3.0
690          */
691         if (value == 0x0 || value == 0x10 || value == 0x11 || value == 0x20 ||
692                 value == 0x30) {
693                 dev_info(ab8500->dev, "detected chip, revision: %#x\n", value);
694         } else {
695                 dev_err(ab8500->dev, "unknown chip, revision: %#x\n", value);
696                 return -EINVAL;
697         }
698         ab8500->chip_id = value;
699
700         if (plat && plat->init)
701                 plat->init(ab8500);
702
703         /* Clear and mask all interrupts */
704         for (i = 0; i < AB8500_NUM_IRQ_REGS; i++) {
705                 /* Interrupt register 12 does'nt exist prior to version 0x20 */
706                 if (ab8500_irq_regoffset[i] == 11 && ab8500->chip_id < 0x20)
707                         continue;
708
709                 get_register_interruptible(ab8500, AB8500_INTERRUPT,
710                         AB8500_IT_LATCH1_REG + ab8500_irq_regoffset[i],
711                         &value);
712                 set_register_interruptible(ab8500, AB8500_INTERRUPT,
713                         AB8500_IT_MASK1_REG + ab8500_irq_regoffset[i], 0xff);
714         }
715
716         ret = abx500_register_ops(ab8500->dev, &ab8500_ops);
717         if (ret)
718                 return ret;
719
720         for (i = 0; i < AB8500_NUM_IRQ_REGS; i++)
721                 ab8500->mask[i] = ab8500->oldmask[i] = 0xff;
722
723         if (ab8500->irq_base) {
724                 ret = ab8500_irq_init(ab8500);
725                 if (ret)
726                         return ret;
727
728                 ret = request_threaded_irq(ab8500->irq, NULL, ab8500_irq,
729                                            IRQF_ONESHOT | IRQF_NO_SUSPEND,
730                                            "ab8500", ab8500);
731                 if (ret)
732                         goto out_removeirq;
733         }
734
735         ret = mfd_add_devices(ab8500->dev, 0, ab8500_devs,
736                               ARRAY_SIZE(ab8500_devs), NULL,
737                               ab8500->irq_base);
738         if (ret)
739                 goto out_freeirq;
740
741         ret = sysfs_create_group(&ab8500->dev->kobj, &ab8500_attr_group);
742         if (ret)
743                 dev_err(ab8500->dev, "error creating sysfs entries\n");
744
745         return ret;
746
747 out_freeirq:
748         if (ab8500->irq_base) {
749                 free_irq(ab8500->irq, ab8500);
750 out_removeirq:
751                 ab8500_irq_remove(ab8500);
752         }
753         return ret;
754 }
755
756 int __devexit ab8500_exit(struct ab8500 *ab8500)
757 {
758         sysfs_remove_group(&ab8500->dev->kobj, &ab8500_attr_group);
759         mfd_remove_devices(ab8500->dev);
760         if (ab8500->irq_base) {
761                 free_irq(ab8500->irq, ab8500);
762                 ab8500_irq_remove(ab8500);
763         }
764
765         return 0;
766 }
767
768 MODULE_AUTHOR("Mattias Wallin, Srinidhi Kasagar, Rabin Vincent");
769 MODULE_DESCRIPTION("AB8500 MFD core");
770 MODULE_LICENSE("GPL v2");