xref: /linux/drivers/mfd/wm8994-irq.c (revision 762f99f4f3cb41a775b5157dd761217beba65873)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * wm8994-irq.c  --  Interrupt controller support for Wolfson WM8994
4  *
5  * Copyright 2010 Wolfson Microelectronics PLC.
6  *
7  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8  */
9 
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/gpio.h>
13 #include <linux/i2c.h>
14 #include <linux/irq.h>
15 #include <linux/mfd/core.h>
16 #include <linux/interrupt.h>
17 #include <linux/irqdomain.h>
18 #include <linux/regmap.h>
19 
20 #include <linux/mfd/wm8994/core.h>
21 #include <linux/mfd/wm8994/pdata.h>
22 #include <linux/mfd/wm8994/registers.h>
23 
24 #include <linux/delay.h>
25 
26 static const struct regmap_irq wm8994_irqs[] = {
27 	[WM8994_IRQ_TEMP_SHUT] = {
28 		.reg_offset = 1,
29 		.mask = WM8994_TEMP_SHUT_EINT,
30 	},
31 	[WM8994_IRQ_MIC1_DET] = {
32 		.reg_offset = 1,
33 		.mask = WM8994_MIC1_DET_EINT,
34 	},
35 	[WM8994_IRQ_MIC1_SHRT] = {
36 		.reg_offset = 1,
37 		.mask = WM8994_MIC1_SHRT_EINT,
38 	},
39 	[WM8994_IRQ_MIC2_DET] = {
40 		.reg_offset = 1,
41 		.mask = WM8994_MIC2_DET_EINT,
42 	},
43 	[WM8994_IRQ_MIC2_SHRT] = {
44 		.reg_offset = 1,
45 		.mask = WM8994_MIC2_SHRT_EINT,
46 	},
47 	[WM8994_IRQ_FLL1_LOCK] = {
48 		.reg_offset = 1,
49 		.mask = WM8994_FLL1_LOCK_EINT,
50 	},
51 	[WM8994_IRQ_FLL2_LOCK] = {
52 		.reg_offset = 1,
53 		.mask = WM8994_FLL2_LOCK_EINT,
54 	},
55 	[WM8994_IRQ_SRC1_LOCK] = {
56 		.reg_offset = 1,
57 		.mask = WM8994_SRC1_LOCK_EINT,
58 	},
59 	[WM8994_IRQ_SRC2_LOCK] = {
60 		.reg_offset = 1,
61 		.mask = WM8994_SRC2_LOCK_EINT,
62 	},
63 	[WM8994_IRQ_AIF1DRC1_SIG_DET] = {
64 		.reg_offset = 1,
65 		.mask = WM8994_AIF1DRC1_SIG_DET,
66 	},
67 	[WM8994_IRQ_AIF1DRC2_SIG_DET] = {
68 		.reg_offset = 1,
69 		.mask = WM8994_AIF1DRC2_SIG_DET_EINT,
70 	},
71 	[WM8994_IRQ_AIF2DRC_SIG_DET] = {
72 		.reg_offset = 1,
73 		.mask = WM8994_AIF2DRC_SIG_DET_EINT,
74 	},
75 	[WM8994_IRQ_FIFOS_ERR] = {
76 		.reg_offset = 1,
77 		.mask = WM8994_FIFOS_ERR_EINT,
78 	},
79 	[WM8994_IRQ_WSEQ_DONE] = {
80 		.reg_offset = 1,
81 		.mask = WM8994_WSEQ_DONE_EINT,
82 	},
83 	[WM8994_IRQ_DCS_DONE] = {
84 		.reg_offset = 1,
85 		.mask = WM8994_DCS_DONE_EINT,
86 	},
87 	[WM8994_IRQ_TEMP_WARN] = {
88 		.reg_offset = 1,
89 		.mask = WM8994_TEMP_WARN_EINT,
90 	},
91 	[WM8994_IRQ_GPIO(1)] = {
92 		.mask = WM8994_GP1_EINT,
93 	},
94 	[WM8994_IRQ_GPIO(2)] = {
95 		.mask = WM8994_GP2_EINT,
96 	},
97 	[WM8994_IRQ_GPIO(3)] = {
98 		.mask = WM8994_GP3_EINT,
99 	},
100 	[WM8994_IRQ_GPIO(4)] = {
101 		.mask = WM8994_GP4_EINT,
102 	},
103 	[WM8994_IRQ_GPIO(5)] = {
104 		.mask = WM8994_GP5_EINT,
105 	},
106 	[WM8994_IRQ_GPIO(6)] = {
107 		.mask = WM8994_GP6_EINT,
108 	},
109 	[WM8994_IRQ_GPIO(7)] = {
110 		.mask = WM8994_GP7_EINT,
111 	},
112 	[WM8994_IRQ_GPIO(8)] = {
113 		.mask = WM8994_GP8_EINT,
114 	},
115 	[WM8994_IRQ_GPIO(9)] = {
116 		.mask = WM8994_GP8_EINT,
117 	},
118 	[WM8994_IRQ_GPIO(10)] = {
119 		.mask = WM8994_GP10_EINT,
120 	},
121 	[WM8994_IRQ_GPIO(11)] = {
122 		.mask = WM8994_GP11_EINT,
123 	},
124 };
125 
126 static const struct regmap_irq_chip wm8994_irq_chip = {
127 	.name = "wm8994",
128 	.irqs = wm8994_irqs,
129 	.num_irqs = ARRAY_SIZE(wm8994_irqs),
130 
131 	.num_regs = 2,
132 	.status_base = WM8994_INTERRUPT_STATUS_1,
133 	.mask_base = WM8994_INTERRUPT_STATUS_1_MASK,
134 	.ack_base = WM8994_INTERRUPT_STATUS_1,
135 	.runtime_pm = true,
136 };
137 
wm8994_edge_irq_enable(struct irq_data * data)138 static void wm8994_edge_irq_enable(struct irq_data *data)
139 {
140 }
141 
wm8994_edge_irq_disable(struct irq_data * data)142 static void wm8994_edge_irq_disable(struct irq_data *data)
143 {
144 }
145 
146 static struct irq_chip wm8994_edge_irq_chip = {
147 	.name			= "wm8994_edge",
148 	.irq_disable		= wm8994_edge_irq_disable,
149 	.irq_enable		= wm8994_edge_irq_enable,
150 };
151 
wm8994_edge_irq(int irq,void * data)152 static irqreturn_t wm8994_edge_irq(int irq, void *data)
153 {
154 	struct wm8994 *wm8994 = data;
155 
156 	while (gpio_get_value_cansleep(wm8994->pdata.irq_gpio))
157 		handle_nested_irq(irq_find_mapping(wm8994->edge_irq, 0));
158 
159 	return IRQ_HANDLED;
160 }
161 
wm8994_edge_irq_map(struct irq_domain * h,unsigned int virq,irq_hw_number_t hw)162 static int wm8994_edge_irq_map(struct irq_domain *h, unsigned int virq,
163 			       irq_hw_number_t hw)
164 {
165 	struct wm8994 *wm8994 = h->host_data;
166 
167 	irq_set_chip_data(virq, wm8994);
168 	irq_set_chip_and_handler(virq, &wm8994_edge_irq_chip, handle_edge_irq);
169 	irq_set_nested_thread(virq, 1);
170 	irq_set_noprobe(virq);
171 
172 	return 0;
173 }
174 
175 static const struct irq_domain_ops wm8994_edge_irq_ops = {
176 	.map	= wm8994_edge_irq_map,
177 	.xlate	= irq_domain_xlate_twocell,
178 };
179 
wm8994_irq_init(struct wm8994 * wm8994)180 int wm8994_irq_init(struct wm8994 *wm8994)
181 {
182 	int ret;
183 	unsigned long irqflags;
184 	struct wm8994_pdata *pdata = &wm8994->pdata;
185 
186 	if (!wm8994->irq) {
187 		dev_warn(wm8994->dev,
188 			 "No interrupt specified, no interrupts\n");
189 		wm8994->irq_base = 0;
190 		return 0;
191 	}
192 
193 	/* select user or default irq flags */
194 	irqflags = IRQF_TRIGGER_HIGH | IRQF_ONESHOT;
195 	if (pdata->irq_flags)
196 		irqflags = pdata->irq_flags;
197 
198 	/* use a GPIO for edge triggered controllers */
199 	if (irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
200 		if (gpio_to_irq(pdata->irq_gpio) != wm8994->irq) {
201 			dev_warn(wm8994->dev, "IRQ %d is not GPIO %d (%d)\n",
202 				 wm8994->irq, pdata->irq_gpio,
203 				 gpio_to_irq(pdata->irq_gpio));
204 			wm8994->irq = gpio_to_irq(pdata->irq_gpio);
205 		}
206 
207 		ret = devm_gpio_request_one(wm8994->dev, pdata->irq_gpio,
208 					    GPIOF_IN, "WM8994 IRQ");
209 
210 		if (ret != 0) {
211 			dev_err(wm8994->dev, "Failed to get IRQ GPIO: %d\n",
212 				ret);
213 			return ret;
214 		}
215 
216 		wm8994->edge_irq = irq_domain_add_linear(NULL, 1,
217 							 &wm8994_edge_irq_ops,
218 							 wm8994);
219 
220 		ret = regmap_add_irq_chip(wm8994->regmap,
221 					  irq_create_mapping(wm8994->edge_irq,
222 							     0),
223 					  IRQF_ONESHOT,
224 					  wm8994->irq_base, &wm8994_irq_chip,
225 					  &wm8994->irq_data);
226 		if (ret != 0) {
227 			dev_err(wm8994->dev, "Failed to get IRQ: %d\n",
228 				ret);
229 			return ret;
230 		}
231 
232 		ret = request_threaded_irq(wm8994->irq,
233 					   NULL, wm8994_edge_irq,
234 					   irqflags,
235 					   "WM8994 edge", wm8994);
236 	} else {
237 		ret = regmap_add_irq_chip(wm8994->regmap, wm8994->irq,
238 					  irqflags,
239 					  wm8994->irq_base, &wm8994_irq_chip,
240 					  &wm8994->irq_data);
241 	}
242 
243 	if (ret != 0) {
244 		dev_err(wm8994->dev, "Failed to register IRQ chip: %d\n", ret);
245 		return ret;
246 	}
247 
248 	/* Enable top level interrupt if it was masked */
249 	wm8994_reg_write(wm8994, WM8994_INTERRUPT_CONTROL, 0);
250 
251 	return 0;
252 }
253 EXPORT_SYMBOL(wm8994_irq_init);
254 
wm8994_irq_exit(struct wm8994 * wm8994)255 void wm8994_irq_exit(struct wm8994 *wm8994)
256 {
257 	regmap_del_irq_chip(wm8994->irq, wm8994->irq_data);
258 }
259 EXPORT_SYMBOL(wm8994_irq_exit);
260