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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 #include <linux/regmap.h>
22 
23 #include <linux/mfd/wm8994/core.h>
24 #include <linux/mfd/wm8994/registers.h>
25 
26 #include <linux/delay.h>
27 
28 static struct regmap_irq wm8994_irqs[] = {
29 	[WM8994_IRQ_TEMP_SHUT] = {
30 		.reg_offset = 1,
31 		.mask = WM8994_TEMP_SHUT_EINT,
32 	},
33 	[WM8994_IRQ_MIC1_DET] = {
34 		.reg_offset = 1,
35 		.mask = WM8994_MIC1_DET_EINT,
36 	},
37 	[WM8994_IRQ_MIC1_SHRT] = {
38 		.reg_offset = 1,
39 		.mask = WM8994_MIC1_SHRT_EINT,
40 	},
41 	[WM8994_IRQ_MIC2_DET] = {
42 		.reg_offset = 1,
43 		.mask = WM8994_MIC2_DET_EINT,
44 	},
45 	[WM8994_IRQ_MIC2_SHRT] = {
46 		.reg_offset = 1,
47 		.mask = WM8994_MIC2_SHRT_EINT,
48 	},
49 	[WM8994_IRQ_FLL1_LOCK] = {
50 		.reg_offset = 1,
51 		.mask = WM8994_FLL1_LOCK_EINT,
52 	},
53 	[WM8994_IRQ_FLL2_LOCK] = {
54 		.reg_offset = 1,
55 		.mask = WM8994_FLL2_LOCK_EINT,
56 	},
57 	[WM8994_IRQ_SRC1_LOCK] = {
58 		.reg_offset = 1,
59 		.mask = WM8994_SRC1_LOCK_EINT,
60 	},
61 	[WM8994_IRQ_SRC2_LOCK] = {
62 		.reg_offset = 1,
63 		.mask = WM8994_SRC2_LOCK_EINT,
64 	},
65 	[WM8994_IRQ_AIF1DRC1_SIG_DET] = {
66 		.reg_offset = 1,
67 		.mask = WM8994_AIF1DRC1_SIG_DET,
68 	},
69 	[WM8994_IRQ_AIF1DRC2_SIG_DET] = {
70 		.reg_offset = 1,
71 		.mask = WM8994_AIF1DRC2_SIG_DET_EINT,
72 	},
73 	[WM8994_IRQ_AIF2DRC_SIG_DET] = {
74 		.reg_offset = 1,
75 		.mask = WM8994_AIF2DRC_SIG_DET_EINT,
76 	},
77 	[WM8994_IRQ_FIFOS_ERR] = {
78 		.reg_offset = 1,
79 		.mask = WM8994_FIFOS_ERR_EINT,
80 	},
81 	[WM8994_IRQ_WSEQ_DONE] = {
82 		.reg_offset = 1,
83 		.mask = WM8994_WSEQ_DONE_EINT,
84 	},
85 	[WM8994_IRQ_DCS_DONE] = {
86 		.reg_offset = 1,
87 		.mask = WM8994_DCS_DONE_EINT,
88 	},
89 	[WM8994_IRQ_TEMP_WARN] = {
90 		.reg_offset = 1,
91 		.mask = WM8994_TEMP_WARN_EINT,
92 	},
93 	[WM8994_IRQ_GPIO(1)] = {
94 		.mask = WM8994_GP1_EINT,
95 	},
96 	[WM8994_IRQ_GPIO(2)] = {
97 		.mask = WM8994_GP2_EINT,
98 	},
99 	[WM8994_IRQ_GPIO(3)] = {
100 		.mask = WM8994_GP3_EINT,
101 	},
102 	[WM8994_IRQ_GPIO(4)] = {
103 		.mask = WM8994_GP4_EINT,
104 	},
105 	[WM8994_IRQ_GPIO(5)] = {
106 		.mask = WM8994_GP5_EINT,
107 	},
108 	[WM8994_IRQ_GPIO(6)] = {
109 		.mask = WM8994_GP6_EINT,
110 	},
111 	[WM8994_IRQ_GPIO(7)] = {
112 		.mask = WM8994_GP7_EINT,
113 	},
114 	[WM8994_IRQ_GPIO(8)] = {
115 		.mask = WM8994_GP8_EINT,
116 	},
117 	[WM8994_IRQ_GPIO(9)] = {
118 		.mask = WM8994_GP8_EINT,
119 	},
120 	[WM8994_IRQ_GPIO(10)] = {
121 		.mask = WM8994_GP10_EINT,
122 	},
123 	[WM8994_IRQ_GPIO(11)] = {
124 		.mask = WM8994_GP11_EINT,
125 	},
126 };
127 
128 static struct regmap_irq_chip wm8994_irq_chip = {
129 	.name = "wm8994",
130 	.irqs = wm8994_irqs,
131 	.num_irqs = ARRAY_SIZE(wm8994_irqs),
132 
133 	.num_regs = 2,
134 	.status_base = WM8994_INTERRUPT_STATUS_1,
135 	.mask_base = WM8994_INTERRUPT_STATUS_1_MASK,
136 	.ack_base = WM8994_INTERRUPT_STATUS_1,
137 };
138 
wm8994_irq_init(struct wm8994 * wm8994)139 int wm8994_irq_init(struct wm8994 *wm8994)
140 {
141 	int ret;
142 
143 	if (!wm8994->irq) {
144 		dev_warn(wm8994->dev,
145 			 "No interrupt specified, no interrupts\n");
146 		wm8994->irq_base = 0;
147 		return 0;
148 	}
149 
150 	if (!wm8994->irq_base) {
151 		dev_err(wm8994->dev,
152 			"No interrupt base specified, no interrupts\n");
153 		return 0;
154 	}
155 
156 	ret = regmap_add_irq_chip(wm8994->regmap, wm8994->irq,
157 				  IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
158 				  wm8994->irq_base, &wm8994_irq_chip,
159 				  &wm8994->irq_data);
160 	if (ret != 0) {
161 		dev_err(wm8994->dev, "Failed to register IRQ chip: %d\n", ret);
162 		return ret;
163 	}
164 
165 	/* Enable top level interrupt if it was masked */
166 	wm8994_reg_write(wm8994, WM8994_INTERRUPT_CONTROL, 0);
167 
168 	return 0;
169 }
170 
wm8994_irq_exit(struct wm8994 * wm8994)171 void wm8994_irq_exit(struct wm8994 *wm8994)
172 {
173 	regmap_del_irq_chip(wm8994->irq, wm8994->irq_data);
174 }
175