[linux-2.6-block.git] / drivers / mfd / max8998-irq.c

/*
 * Interrupt controller support for MAX8998
 *
 * Copyright (C) 2010 Samsung Electronics Co.Ltd
 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */

#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/mfd/max8998-private.h>

struct max8998_irq_data {
	int reg;
	int mask;
};

static struct max8998_irq_data max8998_irqs[] = {
	[MAX8998_IRQ_DCINF] = {
		.reg = 1,
		.mask = MAX8998_IRQ_DCINF_MASK,
	},
	[MAX8998_IRQ_DCINR] = {
		.reg = 1,
		.mask = MAX8998_IRQ_DCINR_MASK,
	},
	[MAX8998_IRQ_JIGF] = {
		.reg = 1,
		.mask = MAX8998_IRQ_JIGF_MASK,
	},
	[MAX8998_IRQ_JIGR] = {
		.reg = 1,
		.mask = MAX8998_IRQ_JIGR_MASK,
	},
	[MAX8998_IRQ_PWRONF] = {
		.reg = 1,
		.mask = MAX8998_IRQ_PWRONF_MASK,
	},
	[MAX8998_IRQ_PWRONR] = {
		.reg = 1,
		.mask = MAX8998_IRQ_PWRONR_MASK,
	},
	[MAX8998_IRQ_WTSREVNT] = {
		.reg = 2,
		.mask = MAX8998_IRQ_WTSREVNT_MASK,
	},
	[MAX8998_IRQ_SMPLEVNT] = {
		.reg = 2,
		.mask = MAX8998_IRQ_SMPLEVNT_MASK,
	},
	[MAX8998_IRQ_ALARM1] = {
		.reg = 2,
		.mask = MAX8998_IRQ_ALARM1_MASK,
	},
	[MAX8998_IRQ_ALARM0] = {
		.reg = 2,
		.mask = MAX8998_IRQ_ALARM0_MASK,
	},
	[MAX8998_IRQ_ONKEY1S] = {
		.reg = 3,
		.mask = MAX8998_IRQ_ONKEY1S_MASK,
	},
	[MAX8998_IRQ_TOPOFFR] = {
		.reg = 3,
		.mask = MAX8998_IRQ_TOPOFFR_MASK,
	},
	[MAX8998_IRQ_DCINOVPR] = {
		.reg = 3,
		.mask = MAX8998_IRQ_DCINOVPR_MASK,
	},
	[MAX8998_IRQ_CHGRSTF] = {
		.reg = 3,
		.mask = MAX8998_IRQ_CHGRSTF_MASK,
	},
	[MAX8998_IRQ_DONER] = {
		.reg = 3,
		.mask = MAX8998_IRQ_DONER_MASK,
	},
	[MAX8998_IRQ_CHGFAULT] = {
		.reg = 3,
		.mask = MAX8998_IRQ_CHGFAULT_MASK,
	},
	[MAX8998_IRQ_LOBAT1] = {
		.reg = 4,
		.mask = MAX8998_IRQ_LOBAT1_MASK,
	},
	[MAX8998_IRQ_LOBAT2] = {
		.reg = 4,
		.mask = MAX8998_IRQ_LOBAT2_MASK,
	},
};

static inline struct max8998_irq_data *
irq_to_max8998_irq(struct max8998_dev *max8998, struct irq_data *data)
{
	return &max8998_irqs[data->hwirq];
}

static void max8998_irq_lock(struct irq_data *data)
{
	struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);

	mutex_lock(&max8998->irqlock);
}

static void max8998_irq_sync_unlock(struct irq_data *data)
{
	struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
	int i;

	for (i = 0; i < ARRAY_SIZE(max8998->irq_masks_cur); i++) {
		/*
		 * If there's been a change in the mask write it back
		 * to the hardware.
		 */
		if (max8998->irq_masks_cur[i] != max8998->irq_masks_cache[i]) {
			max8998->irq_masks_cache[i] = max8998->irq_masks_cur[i];
			max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i,
					max8998->irq_masks_cur[i]);
		}
	}

	mutex_unlock(&max8998->irqlock);
}

static void max8998_irq_unmask(struct irq_data *data)
{
	struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
	struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, data);

	max8998->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
}

static void max8998_irq_mask(struct irq_data *data)
{
	struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
	struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, data);

	max8998->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
}

static struct irq_chip max8998_irq_chip = {
	.name = "max8998",
	.irq_bus_lock = max8998_irq_lock,
	.irq_bus_sync_unlock = max8998_irq_sync_unlock,
	.irq_mask = max8998_irq_mask,
	.irq_unmask = max8998_irq_unmask,
};

static irqreturn_t max8998_irq_thread(int irq, void *data)
{
	struct max8998_dev *max8998 = data;
	u8 irq_reg[MAX8998_NUM_IRQ_REGS];
	int ret;
	int i;

	ret = max8998_bulk_read(max8998->i2c, MAX8998_REG_IRQ1,
			MAX8998_NUM_IRQ_REGS, irq_reg);
	if (ret < 0) {
		dev_err(max8998->dev, "Failed to read interrupt register: %d\n",
				ret);
		return IRQ_NONE;
	}

	/* Apply masking */
	for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++)
		irq_reg[i] &= ~max8998->irq_masks_cur[i];

	/* Report */
	for (i = 0; i < MAX8998_IRQ_NR; i++) {
		if (irq_reg[max8998_irqs[i].reg - 1] & max8998_irqs[i].mask) {
			irq = irq_find_mapping(max8998->irq_domain, i);
			if (WARN_ON(!irq)) {
				disable_irq_nosync(max8998->irq);
				return IRQ_NONE;
			}
			handle_nested_irq(irq);
		}
	}

	return IRQ_HANDLED;
}

int max8998_irq_resume(struct max8998_dev *max8998)
{
	if (max8998->irq && max8998->irq_domain)
		max8998_irq_thread(max8998->irq, max8998);
	return 0;
}

static int max8998_irq_domain_map(struct irq_domain *d, unsigned int irq,
					irq_hw_number_t hw)
{
	struct max8997_dev *max8998 = d->host_data;

	irq_set_chip_data(irq, max8998);
	irq_set_chip_and_handler(irq, &max8998_irq_chip, handle_edge_irq);
	irq_set_nested_thread(irq, 1);
	irq_set_noprobe(irq);

	return 0;
}

static const struct irq_domain_ops max8998_irq_domain_ops = {
	.map = max8998_irq_domain_map,
};

int max8998_irq_init(struct max8998_dev *max8998)
{
	int i;
	int ret;
	struct irq_domain *domain;

	if (!max8998->irq) {
		dev_warn(max8998->dev,
			 "No interrupt specified, no interrupts\n");
		return 0;
	}

	mutex_init(&max8998->irqlock);

	/* Mask the individual interrupt sources */
	for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++) {
		max8998->irq_masks_cur[i] = 0xff;
		max8998->irq_masks_cache[i] = 0xff;
		max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i, 0xff);
	}

	max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM1, 0xff);
	max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM2, 0xff);

	domain = irq_domain_add_simple(NULL, MAX8998_IRQ_NR,
			max8998->irq_base, &max8998_irq_domain_ops, max8998);
	if (!domain) {
		dev_err(max8998->dev, "could not create irq domain\n");
		return -ENODEV;
	}
	max8998->irq_domain = domain;

	ret = request_threaded_irq(max8998->irq, NULL, max8998_irq_thread,
				   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
				   "max8998-irq", max8998);
	if (ret) {
		dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
			max8998->irq, ret);
		return ret;
	}

	if (!max8998->ono)
		return 0;

	ret = request_threaded_irq(max8998->ono, NULL, max8998_irq_thread,
				   IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
				   IRQF_ONESHOT, "max8998-ono", max8998);
	if (ret)
		dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
			max8998->ono, ret);

	return 0;
}

void max8998_irq_exit(struct max8998_dev *max8998)
{
	if (max8998->ono)
		free_irq(max8998->ono, max8998);

	if (max8998->irq)
		free_irq(max8998->irq, max8998);
}
Commit	Line	Data
2c7e6f57 JS	1	/*
	2	* Interrupt controller support for MAX8998
	3	*
	4	* Copyright (C) 2010 Samsung Electronics Co.Ltd
	5	* Author: Joonyoung Shim <jy0922.shim@samsung.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the
	9	* Free Software Foundation; either version 2 of the License, or (at your
	10	* option) any later version.
	11	*
	12	*/
	13
	14	#include <linux/device.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/irq.h>
443c6ae2	17	#include <linux/irqdomain.h>
2c7e6f57 JS	18	#include <linux/mfd/max8998-private.h>
	19
	20	struct max8998_irq_data {
	21	int reg;
	22	int mask;
	23	};
	24
	25	static struct max8998_irq_data max8998_irqs[] = {
	26	[MAX8998_IRQ_DCINF] = {
	27	.reg = 1,
	28	.mask = MAX8998_IRQ_DCINF_MASK,
	29	},
	30	[MAX8998_IRQ_DCINR] = {
	31	.reg = 1,
	32	.mask = MAX8998_IRQ_DCINR_MASK,
	33	},
	34	[MAX8998_IRQ_JIGF] = {
	35	.reg = 1,
	36	.mask = MAX8998_IRQ_JIGF_MASK,
	37	},
	38	[MAX8998_IRQ_JIGR] = {
	39	.reg = 1,
	40	.mask = MAX8998_IRQ_JIGR_MASK,
	41	},
	42	[MAX8998_IRQ_PWRONF] = {
	43	.reg = 1,
	44	.mask = MAX8998_IRQ_PWRONF_MASK,
	45	},
	46	[MAX8998_IRQ_PWRONR] = {
	47	.reg = 1,
	48	.mask = MAX8998_IRQ_PWRONR_MASK,
	49	},
	50	[MAX8998_IRQ_WTSREVNT] = {
	51	.reg = 2,
	52	.mask = MAX8998_IRQ_WTSREVNT_MASK,
	53	},
	54	[MAX8998_IRQ_SMPLEVNT] = {
	55	.reg = 2,
	56	.mask = MAX8998_IRQ_SMPLEVNT_MASK,
	57	},
	58	[MAX8998_IRQ_ALARM1] = {
	59	.reg = 2,
	60	.mask = MAX8998_IRQ_ALARM1_MASK,
	61	},
	62	[MAX8998_IRQ_ALARM0] = {
	63	.reg = 2,
	64	.mask = MAX8998_IRQ_ALARM0_MASK,
	65	},
	66	[MAX8998_IRQ_ONKEY1S] = {
	67	.reg = 3,
	68	.mask = MAX8998_IRQ_ONKEY1S_MASK,
	69	},
	70	[MAX8998_IRQ_TOPOFFR] = {
	71	.reg = 3,
	72	.mask = MAX8998_IRQ_TOPOFFR_MASK,
	73	},
	74	[MAX8998_IRQ_DCINOVPR] = {
	75	.reg = 3,
	76	.mask = MAX8998_IRQ_DCINOVPR_MASK,
	77	},
	78	[MAX8998_IRQ_CHGRSTF] = {
	79	.reg = 3,
	80	.mask = MAX8998_IRQ_CHGRSTF_MASK,
	81	},
82	[MAX8998_IRQ_DONER] = {
83	.reg = 3,
84	.mask = MAX8998_IRQ_DONER_MASK,
85	},
86	[MAX8998_IRQ_CHGFAULT] = {
87	.reg = 3,
88	.mask = MAX8998_IRQ_CHGFAULT_MASK,
89	},
90	[MAX8998_IRQ_LOBAT1] = {
91	.reg = 4,
92	.mask = MAX8998_IRQ_LOBAT1_MASK,
93	},
94	[MAX8998_IRQ_LOBAT2] = {
95	.reg = 4,
96	.mask = MAX8998_IRQ_LOBAT2_MASK,
97	},
98	};
99
100	static inline struct max8998_irq_data *
e5ad2344	101	irq_to_max8998_irq(struct max8998_dev max8998, struct irq_data data)
2c7e6f57	102	{
443c6ae2	103	return &max8998_irqs[data->hwirq];
2c7e6f57 JS	104	}
2c7e6f57 JS	105
2898577e	106	static void max8998_irq_lock(struct irq_data *data)
2c7e6f57	107	{
2898577e	108	struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
2c7e6f57 JS	109
	110	mutex_lock(&max8998->irqlock);
	111	}
	112
2898577e	113	static void max8998_irq_sync_unlock(struct irq_data *data)
2c7e6f57	114	{
2898577e	115	struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
2c7e6f57 JS	116	int i;
	117
	118	for (i = 0; i < ARRAY_SIZE(max8998->irq_masks_cur); i++) {
	119	/*
	120	* If there's been a change in the mask write it back
	121	* to the hardware.
	122	*/
	123	if (max8998->irq_masks_cur[i] != max8998->irq_masks_cache[i]) {
	124	max8998->irq_masks_cache[i] = max8998->irq_masks_cur[i];
	125	max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i,
	126	max8998->irq_masks_cur[i]);
	127	}
	128	}
	129
	130	mutex_unlock(&max8998->irqlock);
	131	}
	132
2898577e	133	static void max8998_irq_unmask(struct irq_data *data)
2c7e6f57	134	{
2898577e	135	struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
e5ad2344	136	struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, data);
2c7e6f57 JS	137
	138	max8998->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
	139	}
	140
2898577e	141	static void max8998_irq_mask(struct irq_data *data)
2c7e6f57	142	{
2898577e	143	struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
e5ad2344	144	struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, data);
2c7e6f57 JS	145
	146	max8998->irq_masks_cur[irq_data->reg - 1] \|= irq_data->mask;
	147	}
	148
	149	static struct irq_chip max8998_irq_chip = {
	150	.name = "max8998",
2898577e MB	151	.irq_bus_lock = max8998_irq_lock,
	152	.irq_bus_sync_unlock = max8998_irq_sync_unlock,
	153	.irq_mask = max8998_irq_mask,
	154	.irq_unmask = max8998_irq_unmask,
2c7e6f57 JS	155	};
	156
	157	static irqreturn_t max8998_irq_thread(int irq, void *data)
	158	{
	159	struct max8998_dev *max8998 = data;
	160	u8 irq_reg[MAX8998_NUM_IRQ_REGS];
	161	int ret;
	162	int i;
	163
	164	ret = max8998_bulk_read(max8998->i2c, MAX8998_REG_IRQ1,
	165	MAX8998_NUM_IRQ_REGS, irq_reg);
	166	if (ret < 0) {
	167	dev_err(max8998->dev, "Failed to read interrupt register: %d\n",
	168	ret);
	169	return IRQ_NONE;
	170	}
	171
	172	/* Apply masking */
	173	for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++)
	174	irq_reg[i] &= ~max8998->irq_masks_cur[i];
	175
	176	/* Report */
	177	for (i = 0; i < MAX8998_IRQ_NR; i++) {
443c6ae2 TF	178	if (irq_reg[max8998_irqs[i].reg - 1] & max8998_irqs[i].mask) {
	179	irq = irq_find_mapping(max8998->irq_domain, i);
	180	if (WARN_ON(!irq)) {
	181	disable_irq_nosync(max8998->irq);
	182	return IRQ_NONE;
	183	}
	184	handle_nested_irq(irq);
	185	}
2c7e6f57 JS	186	}
	187
	188	return IRQ_HANDLED;
	189	}
	190
cdd137c9 MH	191	int max8998_irq_resume(struct max8998_dev *max8998)
cdd137c9 MH	192	{
443c6ae2 TF	193	if (max8998->irq && max8998->irq_domain)
	194	max8998_irq_thread(max8998->irq, max8998);
	195	return 0;
	196	}
	197
	198	static int max8998_irq_domain_map(struct irq_domain *d, unsigned int irq,
	199	irq_hw_number_t hw)
	200	{
	201	struct max8997_dev *max8998 = d->host_data;
	202
	203	irq_set_chip_data(irq, max8998);
	204	irq_set_chip_and_handler(irq, &max8998_irq_chip, handle_edge_irq);
	205	irq_set_nested_thread(irq, 1);
443c6ae2	206	irq_set_noprobe(irq);
9bd09f34	207
cdd137c9 MH	208	return 0;
	209	}
	210
7ce7b26f	211	static const struct irq_domain_ops max8998_irq_domain_ops = {
443c6ae2 TF	212	.map = max8998_irq_domain_map,
	213	};
	214
2c7e6f57 JS	215	int max8998_irq_init(struct max8998_dev *max8998)
	216	{
	217	int i;
2c7e6f57	218	int ret;
443c6ae2	219	struct irq_domain *domain;
2c7e6f57 JS	220
	221	if (!max8998->irq) {
	222	dev_warn(max8998->dev,
	223	"No interrupt specified, no interrupts\n");
2c7e6f57 JS	224	return 0;
	225	}
	226
	227	mutex_init(&max8998->irqlock);
	228
	229	/* Mask the individual interrupt sources */
	230	for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++) {
	231	max8998->irq_masks_cur[i] = 0xff;
	232	max8998->irq_masks_cache[i] = 0xff;
	233	max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i, 0xff);
	234	}
	235
	236	max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM1, 0xff);
	237	max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM2, 0xff);
	238
443c6ae2 TF	239	domain = irq_domain_add_simple(NULL, MAX8998_IRQ_NR,
	240	max8998->irq_base, &max8998_irq_domain_ops, max8998);
	241	if (!domain) {
	242	dev_err(max8998->dev, "could not create irq domain\n");
	243	return -ENODEV;
2c7e6f57	244	}
443c6ae2	245	max8998->irq_domain = domain;
2c7e6f57 JS	246
	247	ret = request_threaded_irq(max8998->irq, NULL, max8998_irq_thread,
	248	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	249	"max8998-irq", max8998);
	250	if (ret) {
	251	dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
	252	max8998->irq, ret);
	253	return ret;
	254	}
	255
	256	if (!max8998->ono)
	257	return 0;
	258
	259	ret = request_threaded_irq(max8998->ono, NULL, max8998_irq_thread,
	260	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING \|
	261	IRQF_ONESHOT, "max8998-ono", max8998);
	262	if (ret)
	263	dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
	264	max8998->ono, ret);
	265
	266	return 0;
	267	}
	268
	269	void max8998_irq_exit(struct max8998_dev *max8998)
	270	{
1558b51e AL	271	if (max8998->ono)
	272	free_irq(max8998->ono, max8998);
	273
2c7e6f57 JS	274	if (max8998->irq)
	275	free_irq(max8998->irq, max8998);
	276	}