[net-next-2.6.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/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, int irq)
{
	return &max8998_irqs[irq - max8998->irq_base];
}

static void max8998_irq_lock(unsigned int irq)
{
	struct max8998_dev *max8998 = get_irq_chip_data(irq);

	mutex_lock(&max8998->irqlock);
}

static void max8998_irq_sync_unlock(unsigned int irq)
{
	struct max8998_dev *max8998 = get_irq_chip_data(irq);
	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(unsigned int irq)
{
	struct max8998_dev *max8998 = get_irq_chip_data(irq);
	struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, irq);

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

static void max8998_irq_mask(unsigned int irq)
{
	struct max8998_dev *max8998 = get_irq_chip_data(irq);
	struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, irq);

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

static struct irq_chip max8998_irq_chip = {
	.name = "max8998",
	.bus_lock = max8998_irq_lock,
	.bus_sync_unlock = max8998_irq_sync_unlock,
	.mask = max8998_irq_mask,
	.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)
			handle_nested_irq(max8998->irq_base + i);
	}

	return IRQ_HANDLED;
}

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

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

	if (!max8998->irq_base) {
		dev_err(max8998->dev,
			"No interrupt base 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);

	/* register with genirq */
	for (i = 0; i < MAX8998_IRQ_NR; i++) {
		cur_irq = i + max8998->irq_base;
		set_irq_chip_data(cur_irq, max8998);
		set_irq_chip_and_handler(cur_irq, &max8998_irq_chip,
					 handle_edge_irq);
		set_irq_nested_thread(cur_irq, 1);
#ifdef CONFIG_ARM
		set_irq_flags(cur_irq, IRQF_VALID);
#else
		set_irq_noprobe(cur_irq);
#endif
	}

	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>
	17	#include <linux/mfd/max8998-private.h>
	18
	19	struct max8998_irq_data {
	20	int reg;
	21	int mask;
	22	};
	23
	24	static struct max8998_irq_data max8998_irqs[] = {
	25	[MAX8998_IRQ_DCINF] = {
	26	.reg = 1,
	27	.mask = MAX8998_IRQ_DCINF_MASK,
	28	},
	29	[MAX8998_IRQ_DCINR] = {
	30	.reg = 1,
	31	.mask = MAX8998_IRQ_DCINR_MASK,
	32	},
	33	[MAX8998_IRQ_JIGF] = {
	34	.reg = 1,
	35	.mask = MAX8998_IRQ_JIGF_MASK,
	36	},
	37	[MAX8998_IRQ_JIGR] = {
	38	.reg = 1,
	39	.mask = MAX8998_IRQ_JIGR_MASK,
	40	},
	41	[MAX8998_IRQ_PWRONF] = {
	42	.reg = 1,
	43	.mask = MAX8998_IRQ_PWRONF_MASK,
	44	},
	45	[MAX8998_IRQ_PWRONR] = {
	46	.reg = 1,
	47	.mask = MAX8998_IRQ_PWRONR_MASK,
	48	},
	49	[MAX8998_IRQ_WTSREVNT] = {
	50	.reg = 2,
	51	.mask = MAX8998_IRQ_WTSREVNT_MASK,
	52	},
	53	[MAX8998_IRQ_SMPLEVNT] = {
	54	.reg = 2,
	55	.mask = MAX8998_IRQ_SMPLEVNT_MASK,
	56	},
	57	[MAX8998_IRQ_ALARM1] = {
	58	.reg = 2,
	59	.mask = MAX8998_IRQ_ALARM1_MASK,
	60	},
	61	[MAX8998_IRQ_ALARM0] = {
	62	.reg = 2,
	63	.mask = MAX8998_IRQ_ALARM0_MASK,
	64	},
65	[MAX8998_IRQ_ONKEY1S] = {
66	.reg = 3,
67	.mask = MAX8998_IRQ_ONKEY1S_MASK,
68	},
69	[MAX8998_IRQ_TOPOFFR] = {
70	.reg = 3,
71	.mask = MAX8998_IRQ_TOPOFFR_MASK,
72	},
73	[MAX8998_IRQ_DCINOVPR] = {
74	.reg = 3,
75	.mask = MAX8998_IRQ_DCINOVPR_MASK,
76	},
77	[MAX8998_IRQ_CHGRSTF] = {
78	.reg = 3,
79	.mask = MAX8998_IRQ_CHGRSTF_MASK,
80	},
81	[MAX8998_IRQ_DONER] = {
82	.reg = 3,
83	.mask = MAX8998_IRQ_DONER_MASK,
84	},
85	[MAX8998_IRQ_CHGFAULT] = {
86	.reg = 3,
87	.mask = MAX8998_IRQ_CHGFAULT_MASK,
88	},
89	[MAX8998_IRQ_LOBAT1] = {
90	.reg = 4,
91	.mask = MAX8998_IRQ_LOBAT1_MASK,
92	},
93	[MAX8998_IRQ_LOBAT2] = {
94	.reg = 4,
95	.mask = MAX8998_IRQ_LOBAT2_MASK,
96	},
97	};
98
99	static inline struct max8998_irq_data *
100	irq_to_max8998_irq(struct max8998_dev *max8998, int irq)
101	{
102	return &max8998_irqs[irq - max8998->irq_base];
103	}
104
105	static void max8998_irq_lock(unsigned int irq)
106	{
107	struct max8998_dev *max8998 = get_irq_chip_data(irq);
108
109	mutex_lock(&max8998->irqlock);
110	}
111
112	static void max8998_irq_sync_unlock(unsigned int irq)
113	{
114	struct max8998_dev *max8998 = get_irq_chip_data(irq);
115	int i;
116
117	for (i = 0; i < ARRAY_SIZE(max8998->irq_masks_cur); i++) {
118	/*
119	* If there's been a change in the mask write it back
120	* to the hardware.
121	*/
122	if (max8998->irq_masks_cur[i] != max8998->irq_masks_cache[i]) {
123	max8998->irq_masks_cache[i] = max8998->irq_masks_cur[i];
124	max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i,
125	max8998->irq_masks_cur[i]);
126	}
127	}
128
129	mutex_unlock(&max8998->irqlock);
130	}
131
132	static void max8998_irq_unmask(unsigned int irq)
133	{
134	struct max8998_dev *max8998 = get_irq_chip_data(irq);
135	struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, irq);
136
137	max8998->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
138	}
139
140	static void max8998_irq_mask(unsigned int irq)
141	{
142	struct max8998_dev *max8998 = get_irq_chip_data(irq);
143	struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, irq);
144
145	max8998->irq_masks_cur[irq_data->reg - 1] \|= irq_data->mask;
146	}
147
148	static struct irq_chip max8998_irq_chip = {
149	.name = "max8998",
150	.bus_lock = max8998_irq_lock,
151	.bus_sync_unlock = max8998_irq_sync_unlock,
152	.mask = max8998_irq_mask,
153	.unmask = max8998_irq_unmask,
154	};
155
156	static irqreturn_t max8998_irq_thread(int irq, void *data)
157	{
158	struct max8998_dev *max8998 = data;
159	u8 irq_reg[MAX8998_NUM_IRQ_REGS];
160	int ret;
161	int i;
162
163	ret = max8998_bulk_read(max8998->i2c, MAX8998_REG_IRQ1,
164	MAX8998_NUM_IRQ_REGS, irq_reg);
165	if (ret < 0) {
166	dev_err(max8998->dev, "Failed to read interrupt register: %d\n",
167	ret);
168	return IRQ_NONE;
169	}
170
171	/* Apply masking */
172	for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++)
173	irq_reg[i] &= ~max8998->irq_masks_cur[i];
174
175	/* Report */
176	for (i = 0; i < MAX8998_IRQ_NR; i++) {
177	if (irq_reg[max8998_irqs[i].reg - 1] & max8998_irqs[i].mask)
178	handle_nested_irq(max8998->irq_base + i);
179	}
180
181	return IRQ_HANDLED;
182	}
183
184	int max8998_irq_init(struct max8998_dev *max8998)
185	{
186	int i;
187	int cur_irq;
188	int ret;
189
190	if (!max8998->irq) {
191	dev_warn(max8998->dev,
192	"No interrupt specified, no interrupts\n");
193	max8998->irq_base = 0;
194	return 0;
195	}
196
197	if (!max8998->irq_base) {
198	dev_err(max8998->dev,
199	"No interrupt base specified, no interrupts\n");
200	return 0;
201	}
202
203	mutex_init(&max8998->irqlock);
204
205	/* Mask the individual interrupt sources */
206	for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++) {
207	max8998->irq_masks_cur[i] = 0xff;
208	max8998->irq_masks_cache[i] = 0xff;
209	max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i, 0xff);
210	}
211
212	max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM1, 0xff);
213	max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM2, 0xff);
214
215	/* register with genirq */
216	for (i = 0; i < MAX8998_IRQ_NR; i++) {
217	cur_irq = i + max8998->irq_base;
218	set_irq_chip_data(cur_irq, max8998);
219	set_irq_chip_and_handler(cur_irq, &max8998_irq_chip,
220	handle_edge_irq);
221	set_irq_nested_thread(cur_irq, 1);
222	#ifdef CONFIG_ARM
223	set_irq_flags(cur_irq, IRQF_VALID);
224	#else
225	set_irq_noprobe(cur_irq);
226	#endif
227	}
228
229	ret = request_threaded_irq(max8998->irq, NULL, max8998_irq_thread,
230	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
231	"max8998-irq", max8998);
232	if (ret) {
233	dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
234	max8998->irq, ret);
235	return ret;
236	}
237
238	if (!max8998->ono)
239	return 0;
240
241	ret = request_threaded_irq(max8998->ono, NULL, max8998_irq_thread,
242	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING \|
243	IRQF_ONESHOT, "max8998-ono", max8998);
244	if (ret)
245	dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
246	max8998->ono, ret);
247
248	return 0;
249	}
250
251	void max8998_irq_exit(struct max8998_dev *max8998)
252	{
1558b51e AL	253	if (max8998->ono)
	254	free_irq(max8998->ono, max8998);
	255
2c7e6f57 JS	256	if (max8998->irq)
	257	free_irq(max8998->irq, max8998);
	258	}