[deliverable/linux.git] / drivers / mfd / wm8994-irq.c

/*
 * wm8994-irq.c  --  Interrupt controller support for Wolfson WM8994
 *
 * Copyright 2010 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.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/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/mfd/core.h>
#include <linux/interrupt.h>

#include <linux/mfd/wm8994/core.h>
#include <linux/mfd/wm8994/registers.h>

#include <linux/delay.h>

struct wm8994_irq_data {
	int reg;
	int mask;
};

static struct wm8994_irq_data wm8994_irqs[] = {
	[WM8994_IRQ_TEMP_SHUT] = {
		.reg = 2,
		.mask = WM8994_TEMP_SHUT_EINT,
	},
	[WM8994_IRQ_MIC1_DET] = {
		.reg = 2,
		.mask = WM8994_MIC1_DET_EINT,
	},
	[WM8994_IRQ_MIC1_SHRT] = {
		.reg = 2,
		.mask = WM8994_MIC1_SHRT_EINT,
	},
	[WM8994_IRQ_MIC2_DET] = {
		.reg = 2,
		.mask = WM8994_MIC2_DET_EINT,
	},
	[WM8994_IRQ_MIC2_SHRT] = {
		.reg = 2,
		.mask = WM8994_MIC2_SHRT_EINT,
	},
	[WM8994_IRQ_FLL1_LOCK] = {
		.reg = 2,
		.mask = WM8994_FLL1_LOCK_EINT,
	},
	[WM8994_IRQ_FLL2_LOCK] = {
		.reg = 2,
		.mask = WM8994_FLL2_LOCK_EINT,
	},
	[WM8994_IRQ_SRC1_LOCK] = {
		.reg = 2,
		.mask = WM8994_SRC1_LOCK_EINT,
	},
	[WM8994_IRQ_SRC2_LOCK] = {
		.reg = 2,
		.mask = WM8994_SRC2_LOCK_EINT,
	},
	[WM8994_IRQ_AIF1DRC1_SIG_DET] = {
		.reg = 2,
		.mask = WM8994_AIF1DRC1_SIG_DET,
	},
	[WM8994_IRQ_AIF1DRC2_SIG_DET] = {
		.reg = 2,
		.mask = WM8994_AIF1DRC2_SIG_DET_EINT,
	},
	[WM8994_IRQ_AIF2DRC_SIG_DET] = {
		.reg = 2,
		.mask = WM8994_AIF2DRC_SIG_DET_EINT,
	},
	[WM8994_IRQ_FIFOS_ERR] = {
		.reg = 2,
		.mask = WM8994_FIFOS_ERR_EINT,
	},
	[WM8994_IRQ_WSEQ_DONE] = {
		.reg = 2,
		.mask = WM8994_WSEQ_DONE_EINT,
	},
	[WM8994_IRQ_DCS_DONE] = {
		.reg = 2,
		.mask = WM8994_DCS_DONE_EINT,
	},
	[WM8994_IRQ_TEMP_WARN] = {
		.reg = 2,
		.mask = WM8994_TEMP_WARN_EINT,
	},
	[WM8994_IRQ_GPIO(1)] = {
		.reg = 1,
		.mask = WM8994_GP1_EINT,
	},
	[WM8994_IRQ_GPIO(2)] = {
		.reg = 1,
		.mask = WM8994_GP2_EINT,
	},
	[WM8994_IRQ_GPIO(3)] = {
		.reg = 1,
		.mask = WM8994_GP3_EINT,
	},
	[WM8994_IRQ_GPIO(4)] = {
		.reg = 1,
		.mask = WM8994_GP4_EINT,
	},
	[WM8994_IRQ_GPIO(5)] = {
		.reg = 1,
		.mask = WM8994_GP5_EINT,
	},
	[WM8994_IRQ_GPIO(6)] = {
		.reg = 1,
		.mask = WM8994_GP6_EINT,
	},
	[WM8994_IRQ_GPIO(7)] = {
		.reg = 1,
		.mask = WM8994_GP7_EINT,
	},
	[WM8994_IRQ_GPIO(8)] = {
		.reg = 1,
		.mask = WM8994_GP8_EINT,
	},
	[WM8994_IRQ_GPIO(9)] = {
		.reg = 1,
		.mask = WM8994_GP8_EINT,
	},
	[WM8994_IRQ_GPIO(10)] = {
		.reg = 1,
		.mask = WM8994_GP10_EINT,
	},
	[WM8994_IRQ_GPIO(11)] = {
		.reg = 1,
		.mask = WM8994_GP11_EINT,
	},
};

static inline struct wm8994_irq_data *irq_to_wm8994_irq(struct wm8994 *wm8994,
							int irq)
{
	return &wm8994_irqs[irq - wm8994->irq_base];
}

static void wm8994_irq_lock(struct irq_data *data)
{
	struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data);

	mutex_lock(&wm8994->irq_lock);
}

static void wm8994_irq_sync_unlock(struct irq_data *data)
{
	struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data);
	int i;

	for (i = 0; i < ARRAY_SIZE(wm8994->irq_masks_cur); i++) {
		/* If there's been a change in the mask write it back
		 * to the hardware. */
		if (wm8994->irq_masks_cur[i] != wm8994->irq_masks_cache[i]) {
			wm8994->irq_masks_cache[i] = wm8994->irq_masks_cur[i];
			wm8994_reg_write(wm8994,
					 WM8994_INTERRUPT_STATUS_1_MASK + i,
					 wm8994->irq_masks_cur[i]);
		}
	}

	mutex_unlock(&wm8994->irq_lock);
}

static void wm8994_irq_enable(struct irq_data *data)
{
	struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data);
	struct wm8994_irq_data *irq_data = irq_to_wm8994_irq(wm8994,
							     data->irq);

	wm8994->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
}

static void wm8994_irq_disable(struct irq_data *data)
{
	struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data);
	struct wm8994_irq_data *irq_data = irq_to_wm8994_irq(wm8994,
							     data->irq);

	wm8994->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
}

static struct irq_chip wm8994_irq_chip = {
	.name			= "wm8994",
	.irq_bus_lock		= wm8994_irq_lock,
	.irq_bus_sync_unlock	= wm8994_irq_sync_unlock,
	.irq_disable		= wm8994_irq_disable,
	.irq_enable		= wm8994_irq_enable,
};

/* The processing of the primary interrupt occurs in a thread so that
 * we can interact with the device over I2C or SPI. */
static irqreturn_t wm8994_irq_thread(int irq, void *data)
{
	struct wm8994 *wm8994 = data;
	unsigned int i;
	u16 status[WM8994_NUM_IRQ_REGS];
	int ret;

	ret = wm8994_bulk_read(wm8994, WM8994_INTERRUPT_STATUS_1,
			       WM8994_NUM_IRQ_REGS, status);
	if (ret < 0) {
		dev_err(wm8994->dev, "Failed to read interrupt status: %d\n",
			ret);
		return IRQ_NONE;
	}

	/* Bit swap and apply masking */
	for (i = 0; i < WM8994_NUM_IRQ_REGS; i++) {
		status[i] = be16_to_cpu(status[i]);
		status[i] &= ~wm8994->irq_masks_cur[i];
	}

	/* Ack any unmasked IRQs */
	for (i = 0; i < ARRAY_SIZE(status); i++) {
		if (status[i])
			wm8994_reg_write(wm8994, WM8994_INTERRUPT_STATUS_1 + i,
					 status[i]);
	}

	/* Report */
	for (i = 0; i < ARRAY_SIZE(wm8994_irqs); i++) {
		if (status[wm8994_irqs[i].reg - 1] & wm8994_irqs[i].mask)
			handle_nested_irq(wm8994->irq_base + i);
	}

	return IRQ_HANDLED;
}

int wm8994_irq_init(struct wm8994 *wm8994)
{
	int i, cur_irq, ret;

	mutex_init(&wm8994->irq_lock);

	/* Mask the individual interrupt sources */
	for (i = 0; i < ARRAY_SIZE(wm8994->irq_masks_cur); i++) {
		wm8994->irq_masks_cur[i] = 0xffff;
		wm8994->irq_masks_cache[i] = 0xffff;
		wm8994_reg_write(wm8994, WM8994_INTERRUPT_STATUS_1_MASK + i,
				 0xffff);
	}

	if (!wm8994->irq) {
		dev_warn(wm8994->dev,
			 "No interrupt specified, no interrupts\n");
		wm8994->irq_base = 0;
		return 0;
	}

	if (!wm8994->irq_base) {
		dev_err(wm8994->dev,
			"No interrupt base specified, no interrupts\n");
		return 0;
	}

	/* Register them with genirq */
	for (cur_irq = wm8994->irq_base;
	     cur_irq < ARRAY_SIZE(wm8994_irqs) + wm8994->irq_base;
	     cur_irq++) {
		irq_set_chip_data(cur_irq, wm8994);
		irq_set_chip_and_handler(cur_irq, &wm8994_irq_chip,
					 handle_edge_irq);
		irq_set_nested_thread(cur_irq, 1);

		/* ARM needs us to explicitly flag the IRQ as valid
		 * and will set them noprobe when we do so. */
#ifdef CONFIG_ARM
		set_irq_flags(cur_irq, IRQF_VALID);
#else
		irq_set_noprobe(cur_irq);
#endif
	}

	ret = request_threaded_irq(wm8994->irq, NULL, wm8994_irq_thread,
				   IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
				   "wm8994", wm8994);
	if (ret != 0) {
		dev_err(wm8994->dev, "Failed to request IRQ %d: %d\n",
			wm8994->irq, ret);
		return ret;
	}

	/* Enable top level interrupt if it was masked */
	wm8994_reg_write(wm8994, WM8994_INTERRUPT_CONTROL, 0);

	return 0;
}

void wm8994_irq_exit(struct wm8994 *wm8994)
{
	if (wm8994->irq)
		free_irq(wm8994->irq, wm8994);
}
Commit	Line	Data
c9fbf7e0 MB	1	/*
	2	* wm8994-irq.c -- Interrupt controller support for Wolfson WM8994
	3	*
	4	* Copyright 2010 Wolfson Microelectronics PLC.
	5	*
	6	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*
	13	*/
	14
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
	17	#include <linux/i2c.h>
	18	#include <linux/irq.h>
	19	#include <linux/mfd/core.h>
	20	#include <linux/interrupt.h>
	21
	22	#include <linux/mfd/wm8994/core.h>
	23	#include <linux/mfd/wm8994/registers.h>
	24
	25	#include <linux/delay.h>
	26
	27	struct wm8994_irq_data {
	28	int reg;
	29	int mask;
	30	};
	31
	32	static struct wm8994_irq_data wm8994_irqs[] = {
	33	[WM8994_IRQ_TEMP_SHUT] = {
	34	.reg = 2,
	35	.mask = WM8994_TEMP_SHUT_EINT,
	36	},
	37	[WM8994_IRQ_MIC1_DET] = {
	38	.reg = 2,
	39	.mask = WM8994_MIC1_DET_EINT,
	40	},
	41	[WM8994_IRQ_MIC1_SHRT] = {
	42	.reg = 2,
	43	.mask = WM8994_MIC1_SHRT_EINT,
	44	},
	45	[WM8994_IRQ_MIC2_DET] = {
	46	.reg = 2,
	47	.mask = WM8994_MIC2_DET_EINT,
	48	},
	49	[WM8994_IRQ_MIC2_SHRT] = {
	50	.reg = 2,
	51	.mask = WM8994_MIC2_SHRT_EINT,
	52	},
	53	[WM8994_IRQ_FLL1_LOCK] = {
	54	.reg = 2,
	55	.mask = WM8994_FLL1_LOCK_EINT,
	56	},
	57	[WM8994_IRQ_FLL2_LOCK] = {
	58	.reg = 2,
	59	.mask = WM8994_FLL2_LOCK_EINT,
	60	},
	61	[WM8994_IRQ_SRC1_LOCK] = {
	62	.reg = 2,
	63	.mask = WM8994_SRC1_LOCK_EINT,
	64	},
65	[WM8994_IRQ_SRC2_LOCK] = {
66	.reg = 2,
67	.mask = WM8994_SRC2_LOCK_EINT,
68	},
69	[WM8994_IRQ_AIF1DRC1_SIG_DET] = {
70	.reg = 2,
71	.mask = WM8994_AIF1DRC1_SIG_DET,
72	},
73	[WM8994_IRQ_AIF1DRC2_SIG_DET] = {
74	.reg = 2,
75	.mask = WM8994_AIF1DRC2_SIG_DET_EINT,
76	},
77	[WM8994_IRQ_AIF2DRC_SIG_DET] = {
78	.reg = 2,
79	.mask = WM8994_AIF2DRC_SIG_DET_EINT,
80	},
81	[WM8994_IRQ_FIFOS_ERR] = {
82	.reg = 2,
83	.mask = WM8994_FIFOS_ERR_EINT,
84	},
85	[WM8994_IRQ_WSEQ_DONE] = {
86	.reg = 2,
87	.mask = WM8994_WSEQ_DONE_EINT,
88	},
89	[WM8994_IRQ_DCS_DONE] = {
90	.reg = 2,
91	.mask = WM8994_DCS_DONE_EINT,
92	},
93	[WM8994_IRQ_TEMP_WARN] = {
94	.reg = 2,
95	.mask = WM8994_TEMP_WARN_EINT,
96	},
97	[WM8994_IRQ_GPIO(1)] = {
98	.reg = 1,
99	.mask = WM8994_GP1_EINT,
100	},
101	[WM8994_IRQ_GPIO(2)] = {
102	.reg = 1,
103	.mask = WM8994_GP2_EINT,
104	},
105	[WM8994_IRQ_GPIO(3)] = {
106	.reg = 1,
107	.mask = WM8994_GP3_EINT,
108	},
109	[WM8994_IRQ_GPIO(4)] = {
110	.reg = 1,
111	.mask = WM8994_GP4_EINT,
112	},
113	[WM8994_IRQ_GPIO(5)] = {
114	.reg = 1,
115	.mask = WM8994_GP5_EINT,
116	},
117	[WM8994_IRQ_GPIO(6)] = {
118	.reg = 1,
119	.mask = WM8994_GP6_EINT,
120	},
121	[WM8994_IRQ_GPIO(7)] = {
122	.reg = 1,
123	.mask = WM8994_GP7_EINT,
124	},
125	[WM8994_IRQ_GPIO(8)] = {
126	.reg = 1,
127	.mask = WM8994_GP8_EINT,
128	},
129	[WM8994_IRQ_GPIO(9)] = {
130	.reg = 1,
131	.mask = WM8994_GP8_EINT,
132	},
133	[WM8994_IRQ_GPIO(10)] = {
134	.reg = 1,
135	.mask = WM8994_GP10_EINT,
136	},
137	[WM8994_IRQ_GPIO(11)] = {
138	.reg = 1,
139	.mask = WM8994_GP11_EINT,
140	},
141	};
142
c9fbf7e0 MB	143	static inline struct wm8994_irq_data irq_to_wm8994_irq(struct wm8994 wm8994,
	144	int irq)
	145	{
	146	return &wm8994_irqs[irq - wm8994->irq_base];
	147	}
	148
baa3f63b	149	static void wm8994_irq_lock(struct irq_data *data)
c9fbf7e0	150	{
25a947f8	151	struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data);
c9fbf7e0 MB	152
	153	mutex_lock(&wm8994->irq_lock);
	154	}
	155
baa3f63b	156	static void wm8994_irq_sync_unlock(struct irq_data *data)
c9fbf7e0	157	{
25a947f8	158	struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data);
c9fbf7e0 MB	159	int i;
	160
	161	for (i = 0; i < ARRAY_SIZE(wm8994->irq_masks_cur); i++) {
	162	/* If there's been a change in the mask write it back
	163	* to the hardware. */
	164	if (wm8994->irq_masks_cur[i] != wm8994->irq_masks_cache[i]) {
	165	wm8994->irq_masks_cache[i] = wm8994->irq_masks_cur[i];
	166	wm8994_reg_write(wm8994,
	167	WM8994_INTERRUPT_STATUS_1_MASK + i,
	168	wm8994->irq_masks_cur[i]);
	169	}
	170	}
	171
	172	mutex_unlock(&wm8994->irq_lock);
	173	}
	174
d664f200	175	static void wm8994_irq_enable(struct irq_data *data)
c9fbf7e0	176	{
25a947f8	177	struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data);
baa3f63b MB	178	struct wm8994_irq_data *irq_data = irq_to_wm8994_irq(wm8994,
baa3f63b MB	179	data->irq);
c9fbf7e0 MB	180
	181	wm8994->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
	182	}
	183
d664f200	184	static void wm8994_irq_disable(struct irq_data *data)
c9fbf7e0	185	{
25a947f8	186	struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data);
baa3f63b MB	187	struct wm8994_irq_data *irq_data = irq_to_wm8994_irq(wm8994,
baa3f63b MB	188	data->irq);
c9fbf7e0 MB	189
	190	wm8994->irq_masks_cur[irq_data->reg - 1] \|= irq_data->mask;
	191	}
	192
	193	static struct irq_chip wm8994_irq_chip = {
baa3f63b MB	194	.name = "wm8994",
	195	.irq_bus_lock = wm8994_irq_lock,
	196	.irq_bus_sync_unlock = wm8994_irq_sync_unlock,
d664f200 MB	197	.irq_disable = wm8994_irq_disable,
d664f200 MB	198	.irq_enable = wm8994_irq_enable,
c9fbf7e0 MB	199	};
	200
	201	/* The processing of the primary interrupt occurs in a thread so that
	202	* we can interact with the device over I2C or SPI. */
	203	static irqreturn_t wm8994_irq_thread(int irq, void *data)
	204	{
	205	struct wm8994 *wm8994 = data;
	206	unsigned int i;
	207	u16 status[WM8994_NUM_IRQ_REGS];
	208	int ret;
	209
	210	ret = wm8994_bulk_read(wm8994, WM8994_INTERRUPT_STATUS_1,
	211	WM8994_NUM_IRQ_REGS, status);
	212	if (ret < 0) {
	213	dev_err(wm8994->dev, "Failed to read interrupt status: %d\n",
	214	ret);
	215	return IRQ_NONE;
	216	}
	217
316b6cc0 MB	218	/* Bit swap and apply masking */
	219	for (i = 0; i < WM8994_NUM_IRQ_REGS; i++) {
	220	status[i] = be16_to_cpu(status[i]);
c9fbf7e0	221	status[i] &= ~wm8994->irq_masks_cur[i];
316b6cc0	222	}
c9fbf7e0	223
c9fbf7e0 MB	224	/* Ack any unmasked IRQs */
	225	for (i = 0; i < ARRAY_SIZE(status); i++) {
	226	if (status[i])
	227	wm8994_reg_write(wm8994, WM8994_INTERRUPT_STATUS_1 + i,
	228	status[i]);
	229	}
	230
ccd80c71 MB	231	/* Report */
	232	for (i = 0; i < ARRAY_SIZE(wm8994_irqs); i++) {
	233	if (status[wm8994_irqs[i].reg - 1] & wm8994_irqs[i].mask)
	234	handle_nested_irq(wm8994->irq_base + i);
	235	}
	236
c9fbf7e0 MB	237	return IRQ_HANDLED;
	238	}
	239
	240	int wm8994_irq_init(struct wm8994 *wm8994)
	241	{
	242	int i, cur_irq, ret;
	243
	244	mutex_init(&wm8994->irq_lock);
	245
	246	/* Mask the individual interrupt sources */
	247	for (i = 0; i < ARRAY_SIZE(wm8994->irq_masks_cur); i++) {
	248	wm8994->irq_masks_cur[i] = 0xffff;
	249	wm8994->irq_masks_cache[i] = 0xffff;
	250	wm8994_reg_write(wm8994, WM8994_INTERRUPT_STATUS_1_MASK + i,
	251	0xffff);
	252	}
	253
	254	if (!wm8994->irq) {
	255	dev_warn(wm8994->dev,
	256	"No interrupt specified, no interrupts\n");
	257	wm8994->irq_base = 0;
	258	return 0;
	259	}
	260
	261	if (!wm8994->irq_base) {
	262	dev_err(wm8994->dev,
	263	"No interrupt base specified, no interrupts\n");
	264	return 0;
	265	}
	266
	267	/* Register them with genirq */
	268	for (cur_irq = wm8994->irq_base;
	269	cur_irq < ARRAY_SIZE(wm8994_irqs) + wm8994->irq_base;
	270	cur_irq++) {
d5bb1221 TG	271	irq_set_chip_data(cur_irq, wm8994);
d5bb1221 TG	272	irq_set_chip_and_handler(cur_irq, &wm8994_irq_chip,
c9fbf7e0	273	handle_edge_irq);
d5bb1221	274	irq_set_nested_thread(cur_irq, 1);
c9fbf7e0 MB	275
	276	/* ARM needs us to explicitly flag the IRQ as valid
	277	* and will set them noprobe when we do so. */
	278	#ifdef CONFIG_ARM
	279	set_irq_flags(cur_irq, IRQF_VALID);
	280	#else
d5bb1221	281	irq_set_noprobe(cur_irq);
c9fbf7e0 MB	282	#endif
	283	}
	284
	285	ret = request_threaded_irq(wm8994->irq, NULL, wm8994_irq_thread,
	286	IRQF_TRIGGER_HIGH \| IRQF_ONESHOT,
	287	"wm8994", wm8994);
	288	if (ret != 0) {
	289	dev_err(wm8994->dev, "Failed to request IRQ %d: %d\n",
	290	wm8994->irq, ret);
	291	return ret;
	292	}
	293
	294	/* Enable top level interrupt if it was masked */
	295	wm8994_reg_write(wm8994, WM8994_INTERRUPT_CONTROL, 0);
	296
	297	return 0;
	298	}
	299
	300	void wm8994_irq_exit(struct wm8994 *wm8994)
	301	{
	302	if (wm8994->irq)
	303	free_irq(wm8994->irq, wm8994);
	304	}