1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // Interrupt controller support for MAX8998
4 //
5 // Copyright (C) 2010 Samsung Electronics Co.Ltd
6 // Author: Joonyoung Shim <jy0922.shim@samsung.com>
7
8 #include <linux/device.h>
9 #include <linux/interrupt.h>
10 #include <linux/irq.h>
11 #include <linux/irqdomain.h>
12 #include <linux/mfd/max8998-private.h>
13
14 struct max8998_irq_data {
15 int reg;
16 int mask;
17 };
18
19 static struct max8998_irq_data max8998_irqs[] = {
20 [MAX8998_IRQ_DCINF] = {
21 .reg = 1,
22 .mask = MAX8998_IRQ_DCINF_MASK,
23 },
24 [MAX8998_IRQ_DCINR] = {
25 .reg = 1,
26 .mask = MAX8998_IRQ_DCINR_MASK,
27 },
28 [MAX8998_IRQ_JIGF] = {
29 .reg = 1,
30 .mask = MAX8998_IRQ_JIGF_MASK,
31 },
32 [MAX8998_IRQ_JIGR] = {
33 .reg = 1,
34 .mask = MAX8998_IRQ_JIGR_MASK,
35 },
36 [MAX8998_IRQ_PWRONF] = {
37 .reg = 1,
38 .mask = MAX8998_IRQ_PWRONF_MASK,
39 },
40 [MAX8998_IRQ_PWRONR] = {
41 .reg = 1,
42 .mask = MAX8998_IRQ_PWRONR_MASK,
43 },
44 [MAX8998_IRQ_WTSREVNT] = {
45 .reg = 2,
46 .mask = MAX8998_IRQ_WTSREVNT_MASK,
47 },
48 [MAX8998_IRQ_SMPLEVNT] = {
49 .reg = 2,
50 .mask = MAX8998_IRQ_SMPLEVNT_MASK,
51 },
52 [MAX8998_IRQ_ALARM1] = {
53 .reg = 2,
54 .mask = MAX8998_IRQ_ALARM1_MASK,
55 },
56 [MAX8998_IRQ_ALARM0] = {
57 .reg = 2,
58 .mask = MAX8998_IRQ_ALARM0_MASK,
59 },
60 [MAX8998_IRQ_ONKEY1S] = {
61 .reg = 3,
62 .mask = MAX8998_IRQ_ONKEY1S_MASK,
63 },
64 [MAX8998_IRQ_TOPOFFR] = {
65 .reg = 3,
66 .mask = MAX8998_IRQ_TOPOFFR_MASK,
67 },
68 [MAX8998_IRQ_DCINOVPR] = {
69 .reg = 3,
70 .mask = MAX8998_IRQ_DCINOVPR_MASK,
71 },
72 [MAX8998_IRQ_CHGRSTF] = {
73 .reg = 3,
74 .mask = MAX8998_IRQ_CHGRSTF_MASK,
75 },
76 [MAX8998_IRQ_DONER] = {
77 .reg = 3,
78 .mask = MAX8998_IRQ_DONER_MASK,
79 },
80 [MAX8998_IRQ_CHGFAULT] = {
81 .reg = 3,
82 .mask = MAX8998_IRQ_CHGFAULT_MASK,
83 },
84 [MAX8998_IRQ_LOBAT1] = {
85 .reg = 4,
86 .mask = MAX8998_IRQ_LOBAT1_MASK,
87 },
88 [MAX8998_IRQ_LOBAT2] = {
89 .reg = 4,
90 .mask = MAX8998_IRQ_LOBAT2_MASK,
91 },
92 };
93
94 static inline struct max8998_irq_data *
irq_to_max8998_irq(struct max8998_dev * max8998,struct irq_data * data)95 irq_to_max8998_irq(struct max8998_dev *max8998, struct irq_data *data)
96 {
97 return &max8998_irqs[data->hwirq];
98 }
99
max8998_irq_lock(struct irq_data * data)100 static void max8998_irq_lock(struct irq_data *data)
101 {
102 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
103
104 mutex_lock(&max8998->irqlock);
105 }
106
max8998_irq_sync_unlock(struct irq_data * data)107 static void max8998_irq_sync_unlock(struct irq_data *data)
108 {
109 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
110 int i;
111
112 for (i = 0; i < ARRAY_SIZE(max8998->irq_masks_cur); i++) {
113 /*
114 * If there's been a change in the mask write it back
115 * to the hardware.
116 */
117 if (max8998->irq_masks_cur[i] != max8998->irq_masks_cache[i]) {
118 max8998->irq_masks_cache[i] = max8998->irq_masks_cur[i];
119 max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i,
120 max8998->irq_masks_cur[i]);
121 }
122 }
123
124 mutex_unlock(&max8998->irqlock);
125 }
126
max8998_irq_unmask(struct irq_data * data)127 static void max8998_irq_unmask(struct irq_data *data)
128 {
129 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
130 struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, data);
131
132 max8998->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
133 }
134
max8998_irq_mask(struct irq_data * data)135 static void max8998_irq_mask(struct irq_data *data)
136 {
137 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
138 struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, data);
139
140 max8998->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
141 }
142
143 static struct irq_chip max8998_irq_chip = {
144 .name = "max8998",
145 .irq_bus_lock = max8998_irq_lock,
146 .irq_bus_sync_unlock = max8998_irq_sync_unlock,
147 .irq_mask = max8998_irq_mask,
148 .irq_unmask = max8998_irq_unmask,
149 };
150
max8998_irq_thread(int irq,void * data)151 static irqreturn_t max8998_irq_thread(int irq, void *data)
152 {
153 struct max8998_dev *max8998 = data;
154 u8 irq_reg[MAX8998_NUM_IRQ_REGS];
155 int ret;
156 int i;
157
158 ret = max8998_bulk_read(max8998->i2c, MAX8998_REG_IRQ1,
159 MAX8998_NUM_IRQ_REGS, irq_reg);
160 if (ret < 0) {
161 dev_err(max8998->dev, "Failed to read interrupt register: %d\n",
162 ret);
163 return IRQ_NONE;
164 }
165
166 /* Apply masking */
167 for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++)
168 irq_reg[i] &= ~max8998->irq_masks_cur[i];
169
170 /* Report */
171 for (i = 0; i < MAX8998_IRQ_NR; i++) {
172 if (irq_reg[max8998_irqs[i].reg - 1] & max8998_irqs[i].mask) {
173 irq = irq_find_mapping(max8998->irq_domain, i);
174 if (WARN_ON(!irq)) {
175 disable_irq_nosync(max8998->irq);
176 return IRQ_NONE;
177 }
178 handle_nested_irq(irq);
179 }
180 }
181
182 return IRQ_HANDLED;
183 }
184
max8998_irq_resume(struct max8998_dev * max8998)185 int max8998_irq_resume(struct max8998_dev *max8998)
186 {
187 if (max8998->irq && max8998->irq_domain)
188 max8998_irq_thread(max8998->irq, max8998);
189 return 0;
190 }
191
max8998_irq_domain_map(struct irq_domain * d,unsigned int irq,irq_hw_number_t hw)192 static int max8998_irq_domain_map(struct irq_domain *d, unsigned int irq,
193 irq_hw_number_t hw)
194 {
195 struct max8997_dev *max8998 = d->host_data;
196
197 irq_set_chip_data(irq, max8998);
198 irq_set_chip_and_handler(irq, &max8998_irq_chip, handle_edge_irq);
199 irq_set_nested_thread(irq, 1);
200 irq_set_noprobe(irq);
201
202 return 0;
203 }
204
205 static const struct irq_domain_ops max8998_irq_domain_ops = {
206 .map = max8998_irq_domain_map,
207 };
208
max8998_irq_init(struct max8998_dev * max8998)209 int max8998_irq_init(struct max8998_dev *max8998)
210 {
211 int i;
212 int ret;
213 struct irq_domain *domain;
214
215 if (!max8998->irq) {
216 dev_warn(max8998->dev,
217 "No interrupt specified, no interrupts\n");
218 return 0;
219 }
220
221 mutex_init(&max8998->irqlock);
222
223 /* Mask the individual interrupt sources */
224 for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++) {
225 max8998->irq_masks_cur[i] = 0xff;
226 max8998->irq_masks_cache[i] = 0xff;
227 max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i, 0xff);
228 }
229
230 max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM1, 0xff);
231 max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM2, 0xff);
232
233 domain = irq_domain_add_simple(NULL, MAX8998_IRQ_NR,
234 max8998->irq_base, &max8998_irq_domain_ops, max8998);
235 if (!domain) {
236 dev_err(max8998->dev, "could not create irq domain\n");
237 return -ENODEV;
238 }
239 max8998->irq_domain = domain;
240
241 ret = request_threaded_irq(max8998->irq, NULL, max8998_irq_thread,
242 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
243 "max8998-irq", max8998);
244 if (ret) {
245 dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
246 max8998->irq, ret);
247 return ret;
248 }
249
250 if (!max8998->ono)
251 return 0;
252
253 ret = request_threaded_irq(max8998->ono, NULL, max8998_irq_thread,
254 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
255 IRQF_ONESHOT, "max8998-ono", max8998);
256 if (ret)
257 dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
258 max8998->ono, ret);
259
260 return 0;
261 }
262
max8998_irq_exit(struct max8998_dev * max8998)263 void max8998_irq_exit(struct max8998_dev *max8998)
264 {
265 if (max8998->ono)
266 free_irq(max8998->ono, max8998);
267
268 if (max8998->irq)
269 free_irq(max8998->irq, max8998);
270 }
271