1 /*
2 * Interrupt controller support for MAX8998
3 *
4 * Copyright (C) 2010 Samsung Electronics Co.Ltd
5 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 *
12 */
13
14 #include <linux/device.h>
15 #include <linux/interrupt.h>
16 #include <linux/irq.h>
17 #include <linux/irqdomain.h>
18 #include <linux/mfd/max8998-private.h>
19
20 struct max8998_irq_data {
21 int reg;
22 int mask;
23 };
24
25 static struct max8998_irq_data max8998_irqs[] = {
26 [MAX8998_IRQ_DCINF] = {
27 .reg = 1,
28 .mask = MAX8998_IRQ_DCINF_MASK,
29 },
30 [MAX8998_IRQ_DCINR] = {
31 .reg = 1,
32 .mask = MAX8998_IRQ_DCINR_MASK,
33 },
34 [MAX8998_IRQ_JIGF] = {
35 .reg = 1,
36 .mask = MAX8998_IRQ_JIGF_MASK,
37 },
38 [MAX8998_IRQ_JIGR] = {
39 .reg = 1,
40 .mask = MAX8998_IRQ_JIGR_MASK,
41 },
42 [MAX8998_IRQ_PWRONF] = {
43 .reg = 1,
44 .mask = MAX8998_IRQ_PWRONF_MASK,
45 },
46 [MAX8998_IRQ_PWRONR] = {
47 .reg = 1,
48 .mask = MAX8998_IRQ_PWRONR_MASK,
49 },
50 [MAX8998_IRQ_WTSREVNT] = {
51 .reg = 2,
52 .mask = MAX8998_IRQ_WTSREVNT_MASK,
53 },
54 [MAX8998_IRQ_SMPLEVNT] = {
55 .reg = 2,
56 .mask = MAX8998_IRQ_SMPLEVNT_MASK,
57 },
58 [MAX8998_IRQ_ALARM1] = {
59 .reg = 2,
60 .mask = MAX8998_IRQ_ALARM1_MASK,
61 },
62 [MAX8998_IRQ_ALARM0] = {
63 .reg = 2,
64 .mask = MAX8998_IRQ_ALARM0_MASK,
65 },
66 [MAX8998_IRQ_ONKEY1S] = {
67 .reg = 3,
68 .mask = MAX8998_IRQ_ONKEY1S_MASK,
69 },
70 [MAX8998_IRQ_TOPOFFR] = {
71 .reg = 3,
72 .mask = MAX8998_IRQ_TOPOFFR_MASK,
73 },
74 [MAX8998_IRQ_DCINOVPR] = {
75 .reg = 3,
76 .mask = MAX8998_IRQ_DCINOVPR_MASK,
77 },
78 [MAX8998_IRQ_CHGRSTF] = {
79 .reg = 3,
80 .mask = MAX8998_IRQ_CHGRSTF_MASK,
81 },
82 [MAX8998_IRQ_DONER] = {
83 .reg = 3,
84 .mask = MAX8998_IRQ_DONER_MASK,
85 },
86 [MAX8998_IRQ_CHGFAULT] = {
87 .reg = 3,
88 .mask = MAX8998_IRQ_CHGFAULT_MASK,
89 },
90 [MAX8998_IRQ_LOBAT1] = {
91 .reg = 4,
92 .mask = MAX8998_IRQ_LOBAT1_MASK,
93 },
94 [MAX8998_IRQ_LOBAT2] = {
95 .reg = 4,
96 .mask = MAX8998_IRQ_LOBAT2_MASK,
97 },
98 };
99
100 static inline struct max8998_irq_data *
irq_to_max8998_irq(struct max8998_dev * max8998,int irq)101 irq_to_max8998_irq(struct max8998_dev *max8998, int irq)
102 {
103 struct irq_data *data = irq_get_irq_data(irq);
104 return &max8998_irqs[data->hwirq];
105 }
106
max8998_irq_lock(struct irq_data * data)107 static void max8998_irq_lock(struct irq_data *data)
108 {
109 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
110
111 mutex_lock(&max8998->irqlock);
112 }
113
max8998_irq_sync_unlock(struct irq_data * data)114 static void max8998_irq_sync_unlock(struct irq_data *data)
115 {
116 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
117 int i;
118
119 for (i = 0; i < ARRAY_SIZE(max8998->irq_masks_cur); i++) {
120 /*
121 * If there's been a change in the mask write it back
122 * to the hardware.
123 */
124 if (max8998->irq_masks_cur[i] != max8998->irq_masks_cache[i]) {
125 max8998->irq_masks_cache[i] = max8998->irq_masks_cur[i];
126 max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i,
127 max8998->irq_masks_cur[i]);
128 }
129 }
130
131 mutex_unlock(&max8998->irqlock);
132 }
133
max8998_irq_unmask(struct irq_data * data)134 static void max8998_irq_unmask(struct irq_data *data)
135 {
136 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
137 struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998,
138 data->irq);
139
140 max8998->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
141 }
142
max8998_irq_mask(struct irq_data * data)143 static void max8998_irq_mask(struct irq_data *data)
144 {
145 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
146 struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998,
147 data->irq);
148
149 max8998->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
150 }
151
152 static struct irq_chip max8998_irq_chip = {
153 .name = "max8998",
154 .irq_bus_lock = max8998_irq_lock,
155 .irq_bus_sync_unlock = max8998_irq_sync_unlock,
156 .irq_mask = max8998_irq_mask,
157 .irq_unmask = max8998_irq_unmask,
158 };
159
max8998_irq_thread(int irq,void * data)160 static irqreturn_t max8998_irq_thread(int irq, void *data)
161 {
162 struct max8998_dev *max8998 = data;
163 u8 irq_reg[MAX8998_NUM_IRQ_REGS];
164 int ret;
165 int i;
166
167 ret = max8998_bulk_read(max8998->i2c, MAX8998_REG_IRQ1,
168 MAX8998_NUM_IRQ_REGS, irq_reg);
169 if (ret < 0) {
170 dev_err(max8998->dev, "Failed to read interrupt register: %d\n",
171 ret);
172 return IRQ_NONE;
173 }
174
175 /* Apply masking */
176 for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++)
177 irq_reg[i] &= ~max8998->irq_masks_cur[i];
178
179 /* Report */
180 for (i = 0; i < MAX8998_IRQ_NR; i++) {
181 if (irq_reg[max8998_irqs[i].reg - 1] & max8998_irqs[i].mask) {
182 irq = irq_find_mapping(max8998->irq_domain, i);
183 if (WARN_ON(!irq)) {
184 disable_irq_nosync(max8998->irq);
185 return IRQ_NONE;
186 }
187 handle_nested_irq(irq);
188 }
189 }
190
191 return IRQ_HANDLED;
192 }
193
max8998_irq_resume(struct max8998_dev * max8998)194 int max8998_irq_resume(struct max8998_dev *max8998)
195 {
196 if (max8998->irq && max8998->irq_domain)
197 max8998_irq_thread(max8998->irq, max8998);
198 return 0;
199 }
200
max8998_irq_domain_map(struct irq_domain * d,unsigned int irq,irq_hw_number_t hw)201 static int max8998_irq_domain_map(struct irq_domain *d, unsigned int irq,
202 irq_hw_number_t hw)
203 {
204 struct max8997_dev *max8998 = d->host_data;
205
206 irq_set_chip_data(irq, max8998);
207 irq_set_chip_and_handler(irq, &max8998_irq_chip, handle_edge_irq);
208 irq_set_nested_thread(irq, 1);
209 #ifdef CONFIG_ARM
210 set_irq_flags(irq, IRQF_VALID);
211 #else
212 irq_set_noprobe(irq);
213 #endif
214 return 0;
215 }
216
217 static struct irq_domain_ops max8998_irq_domain_ops = {
218 .map = max8998_irq_domain_map,
219 };
220
max8998_irq_init(struct max8998_dev * max8998)221 int max8998_irq_init(struct max8998_dev *max8998)
222 {
223 int i;
224 int ret;
225 struct irq_domain *domain;
226
227 if (!max8998->irq) {
228 dev_warn(max8998->dev,
229 "No interrupt specified, no interrupts\n");
230 return 0;
231 }
232
233 mutex_init(&max8998->irqlock);
234
235 /* Mask the individual interrupt sources */
236 for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++) {
237 max8998->irq_masks_cur[i] = 0xff;
238 max8998->irq_masks_cache[i] = 0xff;
239 max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i, 0xff);
240 }
241
242 max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM1, 0xff);
243 max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM2, 0xff);
244
245 domain = irq_domain_add_simple(NULL, MAX8998_IRQ_NR,
246 max8998->irq_base, &max8998_irq_domain_ops, max8998);
247 if (!domain) {
248 dev_err(max8998->dev, "could not create irq domain\n");
249 return -ENODEV;
250 }
251 max8998->irq_domain = domain;
252
253 ret = request_threaded_irq(max8998->irq, NULL, max8998_irq_thread,
254 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
255 "max8998-irq", max8998);
256 if (ret) {
257 dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
258 max8998->irq, ret);
259 return ret;
260 }
261
262 if (!max8998->ono)
263 return 0;
264
265 ret = request_threaded_irq(max8998->ono, NULL, max8998_irq_thread,
266 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
267 IRQF_ONESHOT, "max8998-ono", max8998);
268 if (ret)
269 dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
270 max8998->ono, ret);
271
272 return 0;
273 }
274
max8998_irq_exit(struct max8998_dev * max8998)275 void max8998_irq_exit(struct max8998_dev *max8998)
276 {
277 if (max8998->ono)
278 free_irq(max8998->ono, max8998);
279
280 if (max8998->irq)
281 free_irq(max8998->irq, max8998);
282 }
283