summaryrefslogtreecommitdiffstats
path: root/drivers/mfd/wm8994-irq.c
blob: 55c380a676861208dc355a9e66fda859e9cc15bd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
/*
 * 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/gpio.h>
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/mfd/core.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/regmap.h>

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

#include <linux/delay.h>

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

static const struct regmap_irq_chip wm8994_irq_chip = {
	.name = "wm8994",
	.irqs = wm8994_irqs,
	.num_irqs = ARRAY_SIZE(wm8994_irqs),

	.num_regs = 2,
	.status_base = WM8994_INTERRUPT_STATUS_1,
	.mask_base = WM8994_INTERRUPT_STATUS_1_MASK,
	.ack_base = WM8994_INTERRUPT_STATUS_1,
	.runtime_pm = true,
};

static void wm8994_edge_irq_enable(struct irq_data *data)
{
}

static void wm8994_edge_irq_disable(struct irq_data *data)
{
}

static struct irq_chip wm8994_edge_irq_chip = {
	.name			= "wm8994_edge",
	.irq_disable		= wm8994_edge_irq_disable,
	.irq_enable		= wm8994_edge_irq_enable,
};

static irqreturn_t wm8994_edge_irq(int irq, void *data)
{
	struct wm8994 *wm8994 = data;

	while (gpio_get_value_cansleep(wm8994->pdata.irq_gpio))
		handle_nested_irq(irq_create_mapping(wm8994->edge_irq, 0));

	return IRQ_HANDLED;
}

static int wm8994_edge_irq_map(struct irq_domain *h, unsigned int virq,
			       irq_hw_number_t hw)
{
	struct wm8994 *wm8994 = h->host_data;

	irq_set_chip_data(virq, wm8994);
	irq_set_chip_and_handler(virq, &wm8994_edge_irq_chip, handle_edge_irq);
	irq_set_nested_thread(virq, 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(virq, IRQF_VALID);
#else
	irq_set_noprobe(virq);
#endif

	return 0;
}

static const struct irq_domain_ops wm8994_edge_irq_ops = {
	.map	= wm8994_edge_irq_map,
	.xlate	= irq_domain_xlate_twocell,
};

int wm8994_irq_init(struct wm8994 *wm8994)
{
	int ret;
	unsigned long irqflags;
	struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);

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

	/* select user or default irq flags */
	irqflags = IRQF_TRIGGER_HIGH | IRQF_ONESHOT;
	if (pdata->irq_flags)
		irqflags = pdata->irq_flags;

	/* use a GPIO for edge triggered controllers */
	if (irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
		if (gpio_to_irq(pdata->irq_gpio) != wm8994->irq) {
			dev_warn(wm8994->dev, "IRQ %d is not GPIO %d (%d)\n",
				 wm8994->irq, pdata->irq_gpio,
				 gpio_to_irq(pdata->irq_gpio));
			wm8994->irq = gpio_to_irq(pdata->irq_gpio);
		}

		ret = devm_gpio_request_one(wm8994->dev, pdata->irq_gpio,
					    GPIOF_IN, "WM8994 IRQ");

		if (ret != 0) {
			dev_err(wm8994->dev, "Failed to get IRQ GPIO: %d\n",
				ret);
			return ret;
		}

		wm8994->edge_irq = irq_domain_add_linear(NULL, 1,
							 &wm8994_edge_irq_ops,
							 wm8994);

		ret = regmap_add_irq_chip(wm8994->regmap,
					  irq_create_mapping(wm8994->edge_irq,
							     0),
					  IRQF_ONESHOT,
					  wm8994->irq_base, &wm8994_irq_chip,
					  &wm8994->irq_data);
		if (ret != 0) {
			dev_err(wm8994->dev, "Failed to get IRQ: %d\n",
				ret);
			return ret;
		}

		ret = request_threaded_irq(wm8994->irq,
					   NULL, wm8994_edge_irq,
					   irqflags,
					   "WM8994 edge", wm8994);
	} else {
		ret = regmap_add_irq_chip(wm8994->regmap, wm8994->irq,
					  irqflags,
					  wm8994->irq_base, &wm8994_irq_chip,
					  &wm8994->irq_data);
	}

	if (ret != 0) {
		dev_err(wm8994->dev, "Failed to register IRQ chip: %d\n", ret);
		return ret;
	}

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

	return 0;
}
EXPORT_SYMBOL(wm8994_irq_init);

void wm8994_irq_exit(struct wm8994 *wm8994)
{
	regmap_del_irq_chip(wm8994->irq, wm8994->irq_data);
}
EXPORT_SYMBOL(wm8994_irq_exit);