1/*
2 * Copyright (C) 2004 Texas Instruments, Inc.
3 *
4 * Some parts based tps65010.c:
5 * Copyright (C) 2004 Texas Instruments and
6 * Copyright (C) 2004-2005 David Brownell
7 *
8 * Some parts based on tlv320aic24.c:
9 * Copyright (C) by Kai Svahn <kai.svahn@nokia.com>
10 *
11 * Changes for interrupt handling and clean-up by
12 * Tony Lindgren <tony@atomide.com> and Imre Deak <imre.deak@nokia.com>
13 * Cleanup and generalized support for voltage setting by
14 * Juha Yrjola
15 * Added support for controlling VCORE and regulator sleep states,
16 * Amit Kucheria <amit.kucheria@nokia.com>
17 * Copyright (C) 2005, 2006 Nokia Corporation
18 *
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
23 *
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 */
33
34#include <linux/module.h>
35#include <linux/i2c.h>
36#include <linux/interrupt.h>
37#include <linux/sched.h>
38#include <linux/mutex.h>
39#include <linux/workqueue.h>
40#include <linux/delay.h>
41#include <linux/rtc.h>
42#include <linux/bcd.h>
43#include <linux/slab.h>
44#include <linux/mfd/menelaus.h>
45
46#include <asm/mach/irq.h>
47
48#include <asm/gpio.h>
49
50#define DRIVER_NAME			"menelaus"
51
52#define MENELAUS_I2C_ADDRESS		0x72
53
54#define MENELAUS_REV			0x01
55#define MENELAUS_VCORE_CTRL1		0x02
56#define MENELAUS_VCORE_CTRL2		0x03
57#define MENELAUS_VCORE_CTRL3		0x04
58#define MENELAUS_VCORE_CTRL4		0x05
59#define MENELAUS_VCORE_CTRL5		0x06
60#define MENELAUS_DCDC_CTRL1		0x07
61#define MENELAUS_DCDC_CTRL2		0x08
62#define MENELAUS_DCDC_CTRL3		0x09
63#define MENELAUS_LDO_CTRL1		0x0A
64#define MENELAUS_LDO_CTRL2		0x0B
65#define MENELAUS_LDO_CTRL3		0x0C
66#define MENELAUS_LDO_CTRL4		0x0D
67#define MENELAUS_LDO_CTRL5		0x0E
68#define MENELAUS_LDO_CTRL6		0x0F
69#define MENELAUS_LDO_CTRL7		0x10
70#define MENELAUS_LDO_CTRL8		0x11
71#define MENELAUS_SLEEP_CTRL1		0x12
72#define MENELAUS_SLEEP_CTRL2		0x13
73#define MENELAUS_DEVICE_OFF		0x14
74#define MENELAUS_OSC_CTRL		0x15
75#define MENELAUS_DETECT_CTRL		0x16
76#define MENELAUS_INT_MASK1		0x17
77#define MENELAUS_INT_MASK2		0x18
78#define MENELAUS_INT_STATUS1		0x19
79#define MENELAUS_INT_STATUS2		0x1A
80#define MENELAUS_INT_ACK1		0x1B
81#define MENELAUS_INT_ACK2		0x1C
82#define MENELAUS_GPIO_CTRL		0x1D
83#define MENELAUS_GPIO_IN		0x1E
84#define MENELAUS_GPIO_OUT		0x1F
85#define MENELAUS_BBSMS			0x20
86#define MENELAUS_RTC_CTRL		0x21
87#define MENELAUS_RTC_UPDATE		0x22
88#define MENELAUS_RTC_SEC		0x23
89#define MENELAUS_RTC_MIN		0x24
90#define MENELAUS_RTC_HR			0x25
91#define MENELAUS_RTC_DAY		0x26
92#define MENELAUS_RTC_MON		0x27
93#define MENELAUS_RTC_YR			0x28
94#define MENELAUS_RTC_WKDAY		0x29
95#define MENELAUS_RTC_AL_SEC		0x2A
96#define MENELAUS_RTC_AL_MIN		0x2B
97#define MENELAUS_RTC_AL_HR		0x2C
98#define MENELAUS_RTC_AL_DAY		0x2D
99#define MENELAUS_RTC_AL_MON		0x2E
100#define MENELAUS_RTC_AL_YR		0x2F
101#define MENELAUS_RTC_COMP_MSB		0x30
102#define MENELAUS_RTC_COMP_LSB		0x31
103#define MENELAUS_S1_PULL_EN		0x32
104#define MENELAUS_S1_PULL_DIR		0x33
105#define MENELAUS_S2_PULL_EN		0x34
106#define MENELAUS_S2_PULL_DIR		0x35
107#define MENELAUS_MCT_CTRL1		0x36
108#define MENELAUS_MCT_CTRL2		0x37
109#define MENELAUS_MCT_CTRL3		0x38
110#define MENELAUS_MCT_PIN_ST		0x39
111#define MENELAUS_DEBOUNCE1		0x3A
112
113#define IH_MENELAUS_IRQS		12
114#define MENELAUS_MMC_S1CD_IRQ		0	/* MMC slot 1 card change */
115#define MENELAUS_MMC_S2CD_IRQ		1	/* MMC slot 2 card change */
116#define MENELAUS_MMC_S1D1_IRQ		2	/* MMC DAT1 low in slot 1 */
117#define MENELAUS_MMC_S2D1_IRQ		3	/* MMC DAT1 low in slot 2 */
118#define MENELAUS_LOWBAT_IRQ		4	/* Low battery */
119#define MENELAUS_HOTDIE_IRQ		5	/* Hot die detect */
120#define MENELAUS_UVLO_IRQ		6	/* UVLO detect */
121#define MENELAUS_TSHUT_IRQ		7	/* Thermal shutdown */
122#define MENELAUS_RTCTMR_IRQ		8	/* RTC timer */
123#define MENELAUS_RTCALM_IRQ		9	/* RTC alarm */
124#define MENELAUS_RTCERR_IRQ		10	/* RTC error */
125#define MENELAUS_PSHBTN_IRQ		11	/* Push button */
126#define MENELAUS_RESERVED12_IRQ		12	/* Reserved */
127#define MENELAUS_RESERVED13_IRQ		13	/* Reserved */
128#define MENELAUS_RESERVED14_IRQ		14	/* Reserved */
129#define MENELAUS_RESERVED15_IRQ		15	/* Reserved */
130
131/* VCORE_CTRL1 register */
132#define VCORE_CTRL1_BYP_COMP		(1 << 5)
133#define VCORE_CTRL1_HW_NSW		(1 << 7)
134
135/* GPIO_CTRL register */
136#define GPIO_CTRL_SLOTSELEN		(1 << 5)
137#define GPIO_CTRL_SLPCTLEN		(1 << 6)
138#define GPIO1_DIR_INPUT			(1 << 0)
139#define GPIO2_DIR_INPUT			(1 << 1)
140#define GPIO3_DIR_INPUT			(1 << 2)
141
142/* MCT_CTRL1 register */
143#define MCT_CTRL1_S1_CMD_OD		(1 << 2)
144#define MCT_CTRL1_S2_CMD_OD		(1 << 3)
145
146/* MCT_CTRL2 register */
147#define MCT_CTRL2_VS2_SEL_D0		(1 << 0)
148#define MCT_CTRL2_VS2_SEL_D1		(1 << 1)
149#define MCT_CTRL2_S1CD_BUFEN		(1 << 4)
150#define MCT_CTRL2_S2CD_BUFEN		(1 << 5)
151#define MCT_CTRL2_S1CD_DBEN		(1 << 6)
152#define MCT_CTRL2_S2CD_BEN		(1 << 7)
153
154/* MCT_CTRL3 register */
155#define MCT_CTRL3_SLOT1_EN		(1 << 0)
156#define MCT_CTRL3_SLOT2_EN		(1 << 1)
157#define MCT_CTRL3_S1_AUTO_EN		(1 << 2)
158#define MCT_CTRL3_S2_AUTO_EN		(1 << 3)
159
160/* MCT_PIN_ST register */
161#define MCT_PIN_ST_S1_CD_ST		(1 << 0)
162#define MCT_PIN_ST_S2_CD_ST		(1 << 1)
163
164static void menelaus_work(struct work_struct *_menelaus);
165
166struct menelaus_chip {
167	struct mutex		lock;
168	struct i2c_client	*client;
169	struct work_struct	work;
170#ifdef CONFIG_RTC_DRV_TWL92330
171	struct rtc_device	*rtc;
172	u8			rtc_control;
173	unsigned		uie:1;
174#endif
175	unsigned		vcore_hw_mode:1;
176	u8			mask1, mask2;
177	void			(*handlers[16])(struct menelaus_chip *);
178	void			(*mmc_callback)(void *data, u8 mask);
179	void			*mmc_callback_data;
180};
181
182static struct menelaus_chip *the_menelaus;
183
184static int menelaus_write_reg(int reg, u8 value)
185{
186	int val = i2c_smbus_write_byte_data(the_menelaus->client, reg, value);
187
188	if (val < 0) {
189		pr_err(DRIVER_NAME ": write error");
190		return val;
191	}
192
193	return 0;
194}
195
196static int menelaus_read_reg(int reg)
197{
198	int val = i2c_smbus_read_byte_data(the_menelaus->client, reg);
199
200	if (val < 0)
201		pr_err(DRIVER_NAME ": read error");
202
203	return val;
204}
205
206static int menelaus_enable_irq(int irq)
207{
208	if (irq > 7) {
209		irq -= 8;
210		the_menelaus->mask2 &= ~(1 << irq);
211		return menelaus_write_reg(MENELAUS_INT_MASK2,
212				the_menelaus->mask2);
213	} else {
214		the_menelaus->mask1 &= ~(1 << irq);
215		return menelaus_write_reg(MENELAUS_INT_MASK1,
216				the_menelaus->mask1);
217	}
218}
219
220static int menelaus_disable_irq(int irq)
221{
222	if (irq > 7) {
223		irq -= 8;
224		the_menelaus->mask2 |= (1 << irq);
225		return menelaus_write_reg(MENELAUS_INT_MASK2,
226				the_menelaus->mask2);
227	} else {
228		the_menelaus->mask1 |= (1 << irq);
229		return menelaus_write_reg(MENELAUS_INT_MASK1,
230				the_menelaus->mask1);
231	}
232}
233
234static int menelaus_ack_irq(int irq)
235{
236	if (irq > 7)
237		return menelaus_write_reg(MENELAUS_INT_ACK2, 1 << (irq - 8));
238	else
239		return menelaus_write_reg(MENELAUS_INT_ACK1, 1 << irq);
240}
241
242/* Adds a handler for an interrupt. Does not run in interrupt context */
243static int menelaus_add_irq_work(int irq,
244		void (*handler)(struct menelaus_chip *))
245{
246	int ret = 0;
247
248	mutex_lock(&the_menelaus->lock);
249	the_menelaus->handlers[irq] = handler;
250	ret = menelaus_enable_irq(irq);
251	mutex_unlock(&the_menelaus->lock);
252
253	return ret;
254}
255
256/* Removes handler for an interrupt */
257static int menelaus_remove_irq_work(int irq)
258{
259	int ret = 0;
260
261	mutex_lock(&the_menelaus->lock);
262	ret = menelaus_disable_irq(irq);
263	the_menelaus->handlers[irq] = NULL;
264	mutex_unlock(&the_menelaus->lock);
265
266	return ret;
267}
268
269/*
270 * Gets scheduled when a card detect interrupt happens. Note that in some cases
271 * this line is wired to card cover switch rather than the card detect switch
272 * in each slot. In this case the cards are not seen by menelaus.
273 * FIXME: Add handling for D1 too
274 */
275static void menelaus_mmc_cd_work(struct menelaus_chip *menelaus_hw)
276{
277	int reg;
278	unsigned char card_mask = 0;
279
280	reg = menelaus_read_reg(MENELAUS_MCT_PIN_ST);
281	if (reg < 0)
282		return;
283
284	if (!(reg & 0x1))
285		card_mask |= MCT_PIN_ST_S1_CD_ST;
286
287	if (!(reg & 0x2))
288		card_mask |= MCT_PIN_ST_S2_CD_ST;
289
290	if (menelaus_hw->mmc_callback)
291		menelaus_hw->mmc_callback(menelaus_hw->mmc_callback_data,
292					  card_mask);
293}
294
295/*
296 * Toggles the MMC slots between open-drain and push-pull mode.
297 */
298int menelaus_set_mmc_opendrain(int slot, int enable)
299{
300	int ret, val;
301
302	if (slot != 1 && slot != 2)
303		return -EINVAL;
304	mutex_lock(&the_menelaus->lock);
305	ret = menelaus_read_reg(MENELAUS_MCT_CTRL1);
306	if (ret < 0) {
307		mutex_unlock(&the_menelaus->lock);
308		return ret;
309	}
310	val = ret;
311	if (slot == 1) {
312		if (enable)
313			val |= MCT_CTRL1_S1_CMD_OD;
314		else
315			val &= ~MCT_CTRL1_S1_CMD_OD;
316	} else {
317		if (enable)
318			val |= MCT_CTRL1_S2_CMD_OD;
319		else
320			val &= ~MCT_CTRL1_S2_CMD_OD;
321	}
322	ret = menelaus_write_reg(MENELAUS_MCT_CTRL1, val);
323	mutex_unlock(&the_menelaus->lock);
324
325	return ret;
326}
327EXPORT_SYMBOL(menelaus_set_mmc_opendrain);
328
329int menelaus_set_slot_sel(int enable)
330{
331	int ret;
332
333	mutex_lock(&the_menelaus->lock);
334	ret = menelaus_read_reg(MENELAUS_GPIO_CTRL);
335	if (ret < 0)
336		goto out;
337	ret |= GPIO2_DIR_INPUT;
338	if (enable)
339		ret |= GPIO_CTRL_SLOTSELEN;
340	else
341		ret &= ~GPIO_CTRL_SLOTSELEN;
342	ret = menelaus_write_reg(MENELAUS_GPIO_CTRL, ret);
343out:
344	mutex_unlock(&the_menelaus->lock);
345	return ret;
346}
347EXPORT_SYMBOL(menelaus_set_slot_sel);
348
349int menelaus_set_mmc_slot(int slot, int enable, int power, int cd_en)
350{
351	int ret, val;
352
353	if (slot != 1 && slot != 2)
354		return -EINVAL;
355	if (power >= 3)
356		return -EINVAL;
357
358	mutex_lock(&the_menelaus->lock);
359
360	ret = menelaus_read_reg(MENELAUS_MCT_CTRL2);
361	if (ret < 0)
362		goto out;
363	val = ret;
364	if (slot == 1) {
365		if (cd_en)
366			val |= MCT_CTRL2_S1CD_BUFEN | MCT_CTRL2_S1CD_DBEN;
367		else
368			val &= ~(MCT_CTRL2_S1CD_BUFEN | MCT_CTRL2_S1CD_DBEN);
369	} else {
370		if (cd_en)
371			val |= MCT_CTRL2_S2CD_BUFEN | MCT_CTRL2_S2CD_BEN;
372		else
373			val &= ~(MCT_CTRL2_S2CD_BUFEN | MCT_CTRL2_S2CD_BEN);
374	}
375	ret = menelaus_write_reg(MENELAUS_MCT_CTRL2, val);
376	if (ret < 0)
377		goto out;
378
379	ret = menelaus_read_reg(MENELAUS_MCT_CTRL3);
380	if (ret < 0)
381		goto out;
382	val = ret;
383	if (slot == 1) {
384		if (enable)
385			val |= MCT_CTRL3_SLOT1_EN;
386		else
387			val &= ~MCT_CTRL3_SLOT1_EN;
388	} else {
389		int b;
390
391		if (enable)
392			val |= MCT_CTRL3_SLOT2_EN;
393		else
394			val &= ~MCT_CTRL3_SLOT2_EN;
395		b = menelaus_read_reg(MENELAUS_MCT_CTRL2);
396		b &= ~(MCT_CTRL2_VS2_SEL_D0 | MCT_CTRL2_VS2_SEL_D1);
397		b |= power;
398		ret = menelaus_write_reg(MENELAUS_MCT_CTRL2, b);
399		if (ret < 0)
400			goto out;
401	}
402	/* Disable autonomous shutdown */
403	val &= ~(MCT_CTRL3_S1_AUTO_EN | MCT_CTRL3_S2_AUTO_EN);
404	ret = menelaus_write_reg(MENELAUS_MCT_CTRL3, val);
405out:
406	mutex_unlock(&the_menelaus->lock);
407	return ret;
408}
409EXPORT_SYMBOL(menelaus_set_mmc_slot);
410
411int menelaus_register_mmc_callback(void (*callback)(void *data, u8 card_mask),
412				   void *data)
413{
414	int ret = 0;
415
416	the_menelaus->mmc_callback_data = data;
417	the_menelaus->mmc_callback = callback;
418	ret = menelaus_add_irq_work(MENELAUS_MMC_S1CD_IRQ,
419				    menelaus_mmc_cd_work);
420	if (ret < 0)
421		return ret;
422	ret = menelaus_add_irq_work(MENELAUS_MMC_S2CD_IRQ,
423				    menelaus_mmc_cd_work);
424	if (ret < 0)
425		return ret;
426	ret = menelaus_add_irq_work(MENELAUS_MMC_S1D1_IRQ,
427				    menelaus_mmc_cd_work);
428	if (ret < 0)
429		return ret;
430	ret = menelaus_add_irq_work(MENELAUS_MMC_S2D1_IRQ,
431				    menelaus_mmc_cd_work);
432
433	return ret;
434}
435EXPORT_SYMBOL(menelaus_register_mmc_callback);
436
437void menelaus_unregister_mmc_callback(void)
438{
439	menelaus_remove_irq_work(MENELAUS_MMC_S1CD_IRQ);
440	menelaus_remove_irq_work(MENELAUS_MMC_S2CD_IRQ);
441	menelaus_remove_irq_work(MENELAUS_MMC_S1D1_IRQ);
442	menelaus_remove_irq_work(MENELAUS_MMC_S2D1_IRQ);
443
444	the_menelaus->mmc_callback = NULL;
445	the_menelaus->mmc_callback_data = NULL;
446}
447EXPORT_SYMBOL(menelaus_unregister_mmc_callback);
448
449struct menelaus_vtg {
450	const char *name;
451	u8 vtg_reg;
452	u8 vtg_shift;
453	u8 vtg_bits;
454	u8 mode_reg;
455};
456
457struct menelaus_vtg_value {
458	u16 vtg;
459	u16 val;
460};
461
462static int menelaus_set_voltage(const struct menelaus_vtg *vtg, int mV,
463				int vtg_val, int mode)
464{
465	int val, ret;
466	struct i2c_client *c = the_menelaus->client;
467
468	mutex_lock(&the_menelaus->lock);
469
470	ret = menelaus_read_reg(vtg->vtg_reg);
471	if (ret < 0)
472		goto out;
473	val = ret & ~(((1 << vtg->vtg_bits) - 1) << vtg->vtg_shift);
474	val |= vtg_val << vtg->vtg_shift;
475
476	dev_dbg(&c->dev, "Setting voltage '%s'"
477			 "to %d mV (reg 0x%02x, val 0x%02x)\n",
478			vtg->name, mV, vtg->vtg_reg, val);
479
480	ret = menelaus_write_reg(vtg->vtg_reg, val);
481	if (ret < 0)
482		goto out;
483	ret = menelaus_write_reg(vtg->mode_reg, mode);
484out:
485	mutex_unlock(&the_menelaus->lock);
486	if (ret == 0) {
487		/* Wait for voltage to stabilize */
488		msleep(1);
489	}
490	return ret;
491}
492
493static int menelaus_get_vtg_value(int vtg, const struct menelaus_vtg_value *tbl,
494				  int n)
495{
496	int i;
497
498	for (i = 0; i < n; i++, tbl++)
499		if (tbl->vtg == vtg)
500			return tbl->val;
501	return -EINVAL;
502}
503
504/*
505 * Vcore can be programmed in two ways:
506 * SW-controlled: Required voltage is programmed into VCORE_CTRL1
507 * HW-controlled: Required range (roof-floor) is programmed into VCORE_CTRL3
508 * and VCORE_CTRL4
509 *
510 * Call correct 'set' function accordingly
511 */
512
513static const struct menelaus_vtg_value vcore_values[] = {
514	{ 1000, 0 },
515	{ 1025, 1 },
516	{ 1050, 2 },
517	{ 1075, 3 },
518	{ 1100, 4 },
519	{ 1125, 5 },
520	{ 1150, 6 },
521	{ 1175, 7 },
522	{ 1200, 8 },
523	{ 1225, 9 },
524	{ 1250, 10 },
525	{ 1275, 11 },
526	{ 1300, 12 },
527	{ 1325, 13 },
528	{ 1350, 14 },
529	{ 1375, 15 },
530	{ 1400, 16 },
531	{ 1425, 17 },
532	{ 1450, 18 },
533};
534
535int menelaus_set_vcore_hw(unsigned int roof_mV, unsigned int floor_mV)
536{
537	int fval, rval, val, ret;
538	struct i2c_client *c = the_menelaus->client;
539
540	rval = menelaus_get_vtg_value(roof_mV, vcore_values,
541				      ARRAY_SIZE(vcore_values));
542	if (rval < 0)
543		return -EINVAL;
544	fval = menelaus_get_vtg_value(floor_mV, vcore_values,
545				      ARRAY_SIZE(vcore_values));
546	if (fval < 0)
547		return -EINVAL;
548
549	dev_dbg(&c->dev, "Setting VCORE FLOOR to %d mV and ROOF to %d mV\n",
550	       floor_mV, roof_mV);
551
552	mutex_lock(&the_menelaus->lock);
553	ret = menelaus_write_reg(MENELAUS_VCORE_CTRL3, fval);
554	if (ret < 0)
555		goto out;
556	ret = menelaus_write_reg(MENELAUS_VCORE_CTRL4, rval);
557	if (ret < 0)
558		goto out;
559	if (!the_menelaus->vcore_hw_mode) {
560		val = menelaus_read_reg(MENELAUS_VCORE_CTRL1);
561		/* HW mode, turn OFF byte comparator */
562		val |= (VCORE_CTRL1_HW_NSW | VCORE_CTRL1_BYP_COMP);
563		ret = menelaus_write_reg(MENELAUS_VCORE_CTRL1, val);
564		the_menelaus->vcore_hw_mode = 1;
565	}
566	msleep(1);
567out:
568	mutex_unlock(&the_menelaus->lock);
569	return ret;
570}
571
572static const struct menelaus_vtg vmem_vtg = {
573	.name = "VMEM",
574	.vtg_reg = MENELAUS_LDO_CTRL1,
575	.vtg_shift = 0,
576	.vtg_bits = 2,
577	.mode_reg = MENELAUS_LDO_CTRL3,
578};
579
580static const struct menelaus_vtg_value vmem_values[] = {
581	{ 1500, 0 },
582	{ 1800, 1 },
583	{ 1900, 2 },
584	{ 2500, 3 },
585};
586
587int menelaus_set_vmem(unsigned int mV)
588{
589	int val;
590
591	if (mV == 0)
592		return menelaus_set_voltage(&vmem_vtg, 0, 0, 0);
593
594	val = menelaus_get_vtg_value(mV, vmem_values, ARRAY_SIZE(vmem_values));
595	if (val < 0)
596		return -EINVAL;
597	return menelaus_set_voltage(&vmem_vtg, mV, val, 0x02);
598}
599EXPORT_SYMBOL(menelaus_set_vmem);
600
601static const struct menelaus_vtg vio_vtg = {
602	.name = "VIO",
603	.vtg_reg = MENELAUS_LDO_CTRL1,
604	.vtg_shift = 2,
605	.vtg_bits = 2,
606	.mode_reg = MENELAUS_LDO_CTRL4,
607};
608
609static const struct menelaus_vtg_value vio_values[] = {
610	{ 1500, 0 },
611	{ 1800, 1 },
612	{ 2500, 2 },
613	{ 2800, 3 },
614};
615
616int menelaus_set_vio(unsigned int mV)
617{
618	int val;
619
620	if (mV == 0)
621		return menelaus_set_voltage(&vio_vtg, 0, 0, 0);
622
623	val = menelaus_get_vtg_value(mV, vio_values, ARRAY_SIZE(vio_values));
624	if (val < 0)
625		return -EINVAL;
626	return menelaus_set_voltage(&vio_vtg, mV, val, 0x02);
627}
628EXPORT_SYMBOL(menelaus_set_vio);
629
630static const struct menelaus_vtg_value vdcdc_values[] = {
631	{ 1500, 0 },
632	{ 1800, 1 },
633	{ 2000, 2 },
634	{ 2200, 3 },
635	{ 2400, 4 },
636	{ 2800, 5 },
637	{ 3000, 6 },
638	{ 3300, 7 },
639};
640
641static const struct menelaus_vtg vdcdc2_vtg = {
642	.name = "VDCDC2",
643	.vtg_reg = MENELAUS_DCDC_CTRL1,
644	.vtg_shift = 0,
645	.vtg_bits = 3,
646	.mode_reg = MENELAUS_DCDC_CTRL2,
647};
648
649static const struct menelaus_vtg vdcdc3_vtg = {
650	.name = "VDCDC3",
651	.vtg_reg = MENELAUS_DCDC_CTRL1,
652	.vtg_shift = 3,
653	.vtg_bits = 3,
654	.mode_reg = MENELAUS_DCDC_CTRL3,
655};
656
657int menelaus_set_vdcdc(int dcdc, unsigned int mV)
658{
659	const struct menelaus_vtg *vtg;
660	int val;
661
662	if (dcdc != 2 && dcdc != 3)
663		return -EINVAL;
664	if (dcdc == 2)
665		vtg = &vdcdc2_vtg;
666	else
667		vtg = &vdcdc3_vtg;
668
669	if (mV == 0)
670		return menelaus_set_voltage(vtg, 0, 0, 0);
671
672	val = menelaus_get_vtg_value(mV, vdcdc_values,
673				     ARRAY_SIZE(vdcdc_values));
674	if (val < 0)
675		return -EINVAL;
676	return menelaus_set_voltage(vtg, mV, val, 0x03);
677}
678
679static const struct menelaus_vtg_value vmmc_values[] = {
680	{ 1850, 0 },
681	{ 2800, 1 },
682	{ 3000, 2 },
683	{ 3100, 3 },
684};
685
686static const struct menelaus_vtg vmmc_vtg = {
687	.name = "VMMC",
688	.vtg_reg = MENELAUS_LDO_CTRL1,
689	.vtg_shift = 6,
690	.vtg_bits = 2,
691	.mode_reg = MENELAUS_LDO_CTRL7,
692};
693
694int menelaus_set_vmmc(unsigned int mV)
695{
696	int val;
697
698	if (mV == 0)
699		return menelaus_set_voltage(&vmmc_vtg, 0, 0, 0);
700
701	val = menelaus_get_vtg_value(mV, vmmc_values, ARRAY_SIZE(vmmc_values));
702	if (val < 0)
703		return -EINVAL;
704	return menelaus_set_voltage(&vmmc_vtg, mV, val, 0x02);
705}
706EXPORT_SYMBOL(menelaus_set_vmmc);
707
708
709static const struct menelaus_vtg_value vaux_values[] = {
710	{ 1500, 0 },
711	{ 1800, 1 },
712	{ 2500, 2 },
713	{ 2800, 3 },
714};
715
716static const struct menelaus_vtg vaux_vtg = {
717	.name = "VAUX",
718	.vtg_reg = MENELAUS_LDO_CTRL1,
719	.vtg_shift = 4,
720	.vtg_bits = 2,
721	.mode_reg = MENELAUS_LDO_CTRL6,
722};
723
724int menelaus_set_vaux(unsigned int mV)
725{
726	int val;
727
728	if (mV == 0)
729		return menelaus_set_voltage(&vaux_vtg, 0, 0, 0);
730
731	val = menelaus_get_vtg_value(mV, vaux_values, ARRAY_SIZE(vaux_values));
732	if (val < 0)
733		return -EINVAL;
734	return menelaus_set_voltage(&vaux_vtg, mV, val, 0x02);
735}
736EXPORT_SYMBOL(menelaus_set_vaux);
737
738int menelaus_get_slot_pin_states(void)
739{
740	return menelaus_read_reg(MENELAUS_MCT_PIN_ST);
741}
742EXPORT_SYMBOL(menelaus_get_slot_pin_states);
743
744int menelaus_set_regulator_sleep(int enable, u32 val)
745{
746	int t, ret;
747	struct i2c_client *c = the_menelaus->client;
748
749	mutex_lock(&the_menelaus->lock);
750	ret = menelaus_write_reg(MENELAUS_SLEEP_CTRL2, val);
751	if (ret < 0)
752		goto out;
753
754	dev_dbg(&c->dev, "regulator sleep configuration: %02x\n", val);
755
756	ret = menelaus_read_reg(MENELAUS_GPIO_CTRL);
757	if (ret < 0)
758		goto out;
759	t = (GPIO_CTRL_SLPCTLEN | GPIO3_DIR_INPUT);
760	if (enable)
761		ret |= t;
762	else
763		ret &= ~t;
764	ret = menelaus_write_reg(MENELAUS_GPIO_CTRL, ret);
765out:
766	mutex_unlock(&the_menelaus->lock);
767	return ret;
768}
769
770/*-----------------------------------------------------------------------*/
771
772/* Handles Menelaus interrupts. Does not run in interrupt context */
773static void menelaus_work(struct work_struct *_menelaus)
774{
775	struct menelaus_chip *menelaus =
776			container_of(_menelaus, struct menelaus_chip, work);
777	void (*handler)(struct menelaus_chip *menelaus);
778
779	while (1) {
780		unsigned isr;
781
782		isr = (menelaus_read_reg(MENELAUS_INT_STATUS2)
783				& ~menelaus->mask2) << 8;
784		isr |= menelaus_read_reg(MENELAUS_INT_STATUS1)
785				& ~menelaus->mask1;
786		if (!isr)
787			break;
788
789		while (isr) {
790			int irq = fls(isr) - 1;
791			isr &= ~(1 << irq);
792
793			mutex_lock(&menelaus->lock);
794			menelaus_disable_irq(irq);
795			menelaus_ack_irq(irq);
796			handler = menelaus->handlers[irq];
797			if (handler)
798				handler(menelaus);
799			menelaus_enable_irq(irq);
800			mutex_unlock(&menelaus->lock);
801		}
802	}
803	enable_irq(menelaus->client->irq);
804}
805
806/*
807 * We cannot use I2C in interrupt context, so we just schedule work.
808 */
809static irqreturn_t menelaus_irq(int irq, void *_menelaus)
810{
811	struct menelaus_chip *menelaus = _menelaus;
812
813	disable_irq_nosync(irq);
814	(void)schedule_work(&menelaus->work);
815
816	return IRQ_HANDLED;
817}
818
819/*-----------------------------------------------------------------------*/
820
821/*
822 * The RTC needs to be set once, then it runs on backup battery power.
823 * It supports alarms, including system wake alarms (from some modes);
824 * and 1/second IRQs if requested.
825 */
826#ifdef CONFIG_RTC_DRV_TWL92330
827
828#define RTC_CTRL_RTC_EN		(1 << 0)
829#define RTC_CTRL_AL_EN		(1 << 1)
830#define RTC_CTRL_MODE12		(1 << 2)
831#define RTC_CTRL_EVERY_MASK	(3 << 3)
832#define RTC_CTRL_EVERY_SEC	(0 << 3)
833#define RTC_CTRL_EVERY_MIN	(1 << 3)
834#define RTC_CTRL_EVERY_HR	(2 << 3)
835#define RTC_CTRL_EVERY_DAY	(3 << 3)
836
837#define RTC_UPDATE_EVERY	0x08
838
839#define RTC_HR_PM		(1 << 7)
840
841static void menelaus_to_time(char *regs, struct rtc_time *t)
842{
843	t->tm_sec = bcd2bin(regs[0]);
844	t->tm_min = bcd2bin(regs[1]);
845	if (the_menelaus->rtc_control & RTC_CTRL_MODE12) {
846		t->tm_hour = bcd2bin(regs[2] & 0x1f) - 1;
847		if (regs[2] & RTC_HR_PM)
848			t->tm_hour += 12;
849	} else
850		t->tm_hour = bcd2bin(regs[2] & 0x3f);
851	t->tm_mday = bcd2bin(regs[3]);
852	t->tm_mon = bcd2bin(regs[4]) - 1;
853	t->tm_year = bcd2bin(regs[5]) + 100;
854}
855
856static int time_to_menelaus(struct rtc_time *t, int regnum)
857{
858	int	hour, status;
859
860	status = menelaus_write_reg(regnum++, bin2bcd(t->tm_sec));
861	if (status < 0)
862		goto fail;
863
864	status = menelaus_write_reg(regnum++, bin2bcd(t->tm_min));
865	if (status < 0)
866		goto fail;
867
868	if (the_menelaus->rtc_control & RTC_CTRL_MODE12) {
869		hour = t->tm_hour + 1;
870		if (hour > 12)
871			hour = RTC_HR_PM | bin2bcd(hour - 12);
872		else
873			hour = bin2bcd(hour);
874	} else
875		hour = bin2bcd(t->tm_hour);
876	status = menelaus_write_reg(regnum++, hour);
877	if (status < 0)
878		goto fail;
879
880	status = menelaus_write_reg(regnum++, bin2bcd(t->tm_mday));
881	if (status < 0)
882		goto fail;
883
884	status = menelaus_write_reg(regnum++, bin2bcd(t->tm_mon + 1));
885	if (status < 0)
886		goto fail;
887
888	status = menelaus_write_reg(regnum++, bin2bcd(t->tm_year - 100));
889	if (status < 0)
890		goto fail;
891
892	return 0;
893fail:
894	dev_err(&the_menelaus->client->dev, "rtc write reg %02x, err %d\n",
895			--regnum, status);
896	return status;
897}
898
899static int menelaus_read_time(struct device *dev, struct rtc_time *t)
900{
901	struct i2c_msg	msg[2];
902	char		regs[7];
903	int		status;
904
905	/* block read date and time registers */
906	regs[0] = MENELAUS_RTC_SEC;
907
908	msg[0].addr = MENELAUS_I2C_ADDRESS;
909	msg[0].flags = 0;
910	msg[0].len = 1;
911	msg[0].buf = regs;
912
913	msg[1].addr = MENELAUS_I2C_ADDRESS;
914	msg[1].flags = I2C_M_RD;
915	msg[1].len = sizeof(regs);
916	msg[1].buf = regs;
917
918	status = i2c_transfer(the_menelaus->client->adapter, msg, 2);
919	if (status != 2) {
920		dev_err(dev, "%s error %d\n", "read", status);
921		return -EIO;
922	}
923
924	menelaus_to_time(regs, t);
925	t->tm_wday = bcd2bin(regs[6]);
926
927	return 0;
928}
929
930static int menelaus_set_time(struct device *dev, struct rtc_time *t)
931{
932	int		status;
933
934	/* write date and time registers */
935	status = time_to_menelaus(t, MENELAUS_RTC_SEC);
936	if (status < 0)
937		return status;
938	status = menelaus_write_reg(MENELAUS_RTC_WKDAY, bin2bcd(t->tm_wday));
939	if (status < 0) {
940		dev_err(&the_menelaus->client->dev, "rtc write reg %02x "
941				"err %d\n", MENELAUS_RTC_WKDAY, status);
942		return status;
943	}
944
945	/* now commit the write */
946	status = menelaus_write_reg(MENELAUS_RTC_UPDATE, RTC_UPDATE_EVERY);
947	if (status < 0)
948		dev_err(&the_menelaus->client->dev, "rtc commit time, err %d\n",
949				status);
950
951	return 0;
952}
953
954static int menelaus_read_alarm(struct device *dev, struct rtc_wkalrm *w)
955{
956	struct i2c_msg	msg[2];
957	char		regs[6];
958	int		status;
959
960	/* block read alarm registers */
961	regs[0] = MENELAUS_RTC_AL_SEC;
962
963	msg[0].addr = MENELAUS_I2C_ADDRESS;
964	msg[0].flags = 0;
965	msg[0].len = 1;
966	msg[0].buf = regs;
967
968	msg[1].addr = MENELAUS_I2C_ADDRESS;
969	msg[1].flags = I2C_M_RD;
970	msg[1].len = sizeof(regs);
971	msg[1].buf = regs;
972
973	status = i2c_transfer(the_menelaus->client->adapter, msg, 2);
974	if (status != 2) {
975		dev_err(dev, "%s error %d\n", "alarm read", status);
976		return -EIO;
977	}
978
979	menelaus_to_time(regs, &w->time);
980
981	w->enabled = !!(the_menelaus->rtc_control & RTC_CTRL_AL_EN);
982
983	/* NOTE we *could* check if actually pending... */
984	w->pending = 0;
985
986	return 0;
987}
988
989static int menelaus_set_alarm(struct device *dev, struct rtc_wkalrm *w)
990{
991	int		status;
992
993	if (the_menelaus->client->irq <= 0 && w->enabled)
994		return -ENODEV;
995
996	/* clear previous alarm enable */
997	if (the_menelaus->rtc_control & RTC_CTRL_AL_EN) {
998		the_menelaus->rtc_control &= ~RTC_CTRL_AL_EN;
999		status = menelaus_write_reg(MENELAUS_RTC_CTRL,
1000				the_menelaus->rtc_control);
1001		if (status < 0)
1002			return status;
1003	}
1004
1005	/* write alarm registers */
1006	status = time_to_menelaus(&w->time, MENELAUS_RTC_AL_SEC);
1007	if (status < 0)
1008		return status;
1009
1010	/* enable alarm if requested */
1011	if (w->enabled) {
1012		the_menelaus->rtc_control |= RTC_CTRL_AL_EN;
1013		status = menelaus_write_reg(MENELAUS_RTC_CTRL,
1014				the_menelaus->rtc_control);
1015	}
1016
1017	return status;
1018}
1019
1020#ifdef CONFIG_RTC_INTF_DEV
1021
1022static void menelaus_rtc_update_work(struct menelaus_chip *m)
1023{
1024	/* report 1/sec update */
1025	local_irq_disable();
1026	rtc_update_irq(m->rtc, 1, RTC_IRQF | RTC_UF);
1027	local_irq_enable();
1028}
1029
1030static int menelaus_ioctl(struct device *dev, unsigned cmd, unsigned long arg)
1031{
1032	int	status;
1033
1034	if (the_menelaus->client->irq <= 0)
1035		return -ENOIOCTLCMD;
1036
1037	switch (cmd) {
1038	/* alarm IRQ */
1039	case RTC_AIE_ON:
1040		if (the_menelaus->rtc_control & RTC_CTRL_AL_EN)
1041			return 0;
1042		the_menelaus->rtc_control |= RTC_CTRL_AL_EN;
1043		break;
1044	case RTC_AIE_OFF:
1045		if (!(the_menelaus->rtc_control & RTC_CTRL_AL_EN))
1046			return 0;
1047		the_menelaus->rtc_control &= ~RTC_CTRL_AL_EN;
1048		break;
1049	/* 1/second "update" IRQ */
1050	case RTC_UIE_ON:
1051		if (the_menelaus->uie)
1052			return 0;
1053		status = menelaus_remove_irq_work(MENELAUS_RTCTMR_IRQ);
1054		status = menelaus_add_irq_work(MENELAUS_RTCTMR_IRQ,
1055				menelaus_rtc_update_work);
1056		if (status == 0)
1057			the_menelaus->uie = 1;
1058		return status;
1059	case RTC_UIE_OFF:
1060		if (!the_menelaus->uie)
1061			return 0;
1062		status = menelaus_remove_irq_work(MENELAUS_RTCTMR_IRQ);
1063		if (status == 0)
1064			the_menelaus->uie = 0;
1065		return status;
1066	default:
1067		return -ENOIOCTLCMD;
1068	}
1069	return menelaus_write_reg(MENELAUS_RTC_CTRL, the_menelaus->rtc_control);
1070}
1071
1072#else
1073#define menelaus_ioctl	NULL
1074#endif
1075
1076/* REVISIT no compensation register support ... */
1077
1078static const struct rtc_class_ops menelaus_rtc_ops = {
1079	.ioctl			= menelaus_ioctl,
1080	.read_time		= menelaus_read_time,
1081	.set_time		= menelaus_set_time,
1082	.read_alarm		= menelaus_read_alarm,
1083	.set_alarm		= menelaus_set_alarm,
1084};
1085
1086static void menelaus_rtc_alarm_work(struct menelaus_chip *m)
1087{
1088	/* report alarm */
1089	local_irq_disable();
1090	rtc_update_irq(m->rtc, 1, RTC_IRQF | RTC_AF);
1091	local_irq_enable();
1092
1093	/* then disable it; alarms are oneshot */
1094	the_menelaus->rtc_control &= ~RTC_CTRL_AL_EN;
1095	menelaus_write_reg(MENELAUS_RTC_CTRL, the_menelaus->rtc_control);
1096}
1097
1098static inline void menelaus_rtc_init(struct menelaus_chip *m)
1099{
1100	int	alarm = (m->client->irq > 0);
1101
1102	/* assume 32KDETEN pin is pulled high */
1103	if (!(menelaus_read_reg(MENELAUS_OSC_CTRL) & 0x80)) {
1104		dev_dbg(&m->client->dev, "no 32k oscillator\n");
1105		return;
1106	}
1107
1108	/* support RTC alarm; it can issue wakeups */
1109	if (alarm) {
1110		if (menelaus_add_irq_work(MENELAUS_RTCALM_IRQ,
1111				menelaus_rtc_alarm_work) < 0) {
1112			dev_err(&m->client->dev, "can't handle RTC alarm\n");
1113			return;
1114		}
1115		device_init_wakeup(&m->client->dev, 1);
1116	}
1117
1118	/* be sure RTC is enabled; allow 1/sec irqs; leave 12hr mode alone */
1119	m->rtc_control = menelaus_read_reg(MENELAUS_RTC_CTRL);
1120	if (!(m->rtc_control & RTC_CTRL_RTC_EN)
1121			|| (m->rtc_control & RTC_CTRL_AL_EN)
1122			|| (m->rtc_control & RTC_CTRL_EVERY_MASK)) {
1123		if (!(m->rtc_control & RTC_CTRL_RTC_EN)) {
1124			dev_warn(&m->client->dev, "rtc clock needs setting\n");
1125			m->rtc_control |= RTC_CTRL_RTC_EN;
1126		}
1127		m->rtc_control &= ~RTC_CTRL_EVERY_MASK;
1128		m->rtc_control &= ~RTC_CTRL_AL_EN;
1129		menelaus_write_reg(MENELAUS_RTC_CTRL, m->rtc_control);
1130	}
1131
1132	m->rtc = rtc_device_register(DRIVER_NAME,
1133			&m->client->dev,
1134			&menelaus_rtc_ops, THIS_MODULE);
1135	if (IS_ERR(m->rtc)) {
1136		if (alarm) {
1137			menelaus_remove_irq_work(MENELAUS_RTCALM_IRQ);
1138			device_init_wakeup(&m->client->dev, 0);
1139		}
1140		dev_err(&m->client->dev, "can't register RTC: %d\n",
1141				(int) PTR_ERR(m->rtc));
1142		the_menelaus->rtc = NULL;
1143	}
1144}
1145
1146#else
1147
1148static inline void menelaus_rtc_init(struct menelaus_chip *m)
1149{
1150	/* nothing */
1151}
1152
1153#endif
1154
1155/*-----------------------------------------------------------------------*/
1156
1157static struct i2c_driver menelaus_i2c_driver;
1158
1159static int menelaus_probe(struct i2c_client *client,
1160			  const struct i2c_device_id *id)
1161{
1162	struct menelaus_chip	*menelaus;
1163	int			rev = 0;
1164	int			err = 0;
1165	struct menelaus_platform_data *menelaus_pdata =
1166					dev_get_platdata(&client->dev);
1167
1168	if (the_menelaus) {
1169		dev_dbg(&client->dev, "only one %s for now\n",
1170				DRIVER_NAME);
1171		return -ENODEV;
1172	}
1173
1174	menelaus = devm_kzalloc(&client->dev, sizeof(*menelaus), GFP_KERNEL);
1175	if (!menelaus)
1176		return -ENOMEM;
1177
1178	i2c_set_clientdata(client, menelaus);
1179
1180	the_menelaus = menelaus;
1181	menelaus->client = client;
1182
1183	/* If a true probe check the device */
1184	rev = menelaus_read_reg(MENELAUS_REV);
1185	if (rev < 0) {
1186		pr_err(DRIVER_NAME ": device not found");
1187		return -ENODEV;
1188	}
1189
1190	/* Ack and disable all Menelaus interrupts */
1191	menelaus_write_reg(MENELAUS_INT_ACK1, 0xff);
1192	menelaus_write_reg(MENELAUS_INT_ACK2, 0xff);
1193	menelaus_write_reg(MENELAUS_INT_MASK1, 0xff);
1194	menelaus_write_reg(MENELAUS_INT_MASK2, 0xff);
1195	menelaus->mask1 = 0xff;
1196	menelaus->mask2 = 0xff;
1197
1198	/* Set output buffer strengths */
1199	menelaus_write_reg(MENELAUS_MCT_CTRL1, 0x73);
1200
1201	if (client->irq > 0) {
1202		err = request_irq(client->irq, menelaus_irq, 0,
1203				  DRIVER_NAME, menelaus);
1204		if (err) {
1205			dev_dbg(&client->dev,  "can't get IRQ %d, err %d\n",
1206					client->irq, err);
1207			return err;
1208		}
1209	}
1210
1211	mutex_init(&menelaus->lock);
1212	INIT_WORK(&menelaus->work, menelaus_work);
1213
1214	pr_info("Menelaus rev %d.%d\n", rev >> 4, rev & 0x0f);
1215
1216	err = menelaus_read_reg(MENELAUS_VCORE_CTRL1);
1217	if (err < 0)
1218		goto fail;
1219	if (err & VCORE_CTRL1_HW_NSW)
1220		menelaus->vcore_hw_mode = 1;
1221	else
1222		menelaus->vcore_hw_mode = 0;
1223
1224	if (menelaus_pdata != NULL && menelaus_pdata->late_init != NULL) {
1225		err = menelaus_pdata->late_init(&client->dev);
1226		if (err < 0)
1227			goto fail;
1228	}
1229
1230	menelaus_rtc_init(menelaus);
1231
1232	return 0;
1233fail:
1234	free_irq(client->irq, menelaus);
1235	flush_work(&menelaus->work);
1236	return err;
1237}
1238
1239static int menelaus_remove(struct i2c_client *client)
1240{
1241	struct menelaus_chip	*menelaus = i2c_get_clientdata(client);
1242
1243	free_irq(client->irq, menelaus);
1244	flush_work(&menelaus->work);
1245	the_menelaus = NULL;
1246	return 0;
1247}
1248
1249static const struct i2c_device_id menelaus_id[] = {
1250	{ "menelaus", 0 },
1251	{ }
1252};
1253MODULE_DEVICE_TABLE(i2c, menelaus_id);
1254
1255static struct i2c_driver menelaus_i2c_driver = {
1256	.driver = {
1257		.name		= DRIVER_NAME,
1258	},
1259	.probe		= menelaus_probe,
1260	.remove		= menelaus_remove,
1261	.id_table	= menelaus_id,
1262};
1263
1264module_i2c_driver(menelaus_i2c_driver);
1265
1266MODULE_AUTHOR("Texas Instruments, Inc. (and others)");
1267MODULE_DESCRIPTION("I2C interface for Menelaus.");
1268MODULE_LICENSE("GPL");
1269