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/mfd/max8998-private.h>
18
19 struct max8998_irq_data {
20 int reg;
21 int mask;
22 };
23
24 static struct max8998_irq_data max8998_irqs[] = {
25 [MAX8998_IRQ_DCINF] = {
26 .reg = 1,
27 .mask = MAX8998_IRQ_DCINF_MASK,
28 },
29 [MAX8998_IRQ_DCINR] = {
30 .reg = 1,
31 .mask = MAX8998_IRQ_DCINR_MASK,
32 },
33 [MAX8998_IRQ_JIGF] = {
34 .reg = 1,
35 .mask = MAX8998_IRQ_JIGF_MASK,
36 },
37 [MAX8998_IRQ_JIGR] = {
38 .reg = 1,
39 .mask = MAX8998_IRQ_JIGR_MASK,
40 },
41 [MAX8998_IRQ_PWRONF] = {
42 .reg = 1,
43 .mask = MAX8998_IRQ_PWRONF_MASK,
44 },
45 [MAX8998_IRQ_PWRONR] = {
46 .reg = 1,
47 .mask = MAX8998_IRQ_PWRONR_MASK,
48 },
49 [MAX8998_IRQ_WTSREVNT] = {
50 .reg = 2,
51 .mask = MAX8998_IRQ_WTSREVNT_MASK,
52 },
53 [MAX8998_IRQ_SMPLEVNT] = {
54 .reg = 2,
55 .mask = MAX8998_IRQ_SMPLEVNT_MASK,
56 },
57 [MAX8998_IRQ_ALARM1] = {
58 .reg = 2,
59 .mask = MAX8998_IRQ_ALARM1_MASK,
60 },
61 [MAX8998_IRQ_ALARM0] = {
62 .reg = 2,
63 .mask = MAX8998_IRQ_ALARM0_MASK,
64 },
65 [MAX8998_IRQ_ONKEY1S] = {
66 .reg = 3,
67 .mask = MAX8998_IRQ_ONKEY1S_MASK,
68 },
69 [MAX8998_IRQ_TOPOFFR] = {
70 .reg = 3,
71 .mask = MAX8998_IRQ_TOPOFFR_MASK,
72 },
73 [MAX8998_IRQ_DCINOVPR] = {
74 .reg = 3,
75 .mask = MAX8998_IRQ_DCINOVPR_MASK,
76 },
77 [MAX8998_IRQ_CHGRSTF] = {
78 .reg = 3,
79 .mask = MAX8998_IRQ_CHGRSTF_MASK,
80 },
81 [MAX8998_IRQ_DONER] = {
82 .reg = 3,
83 .mask = MAX8998_IRQ_DONER_MASK,
84 },
85 [MAX8998_IRQ_CHGFAULT] = {
86 .reg = 3,
87 .mask = MAX8998_IRQ_CHGFAULT_MASK,
88 },
89 [MAX8998_IRQ_LOBAT1] = {
90 .reg = 4,
91 .mask = MAX8998_IRQ_LOBAT1_MASK,
92 },
93 [MAX8998_IRQ_LOBAT2] = {
94 .reg = 4,
95 .mask = MAX8998_IRQ_LOBAT2_MASK,
96 },
97 };
98
99 static inline struct max8998_irq_data *
irq_to_max8998_irq(struct max8998_dev * max8998,int irq)100 irq_to_max8998_irq(struct max8998_dev *max8998, int irq)
101 {
102 return &max8998_irqs[irq - max8998->irq_base];
103 }
104
max8998_irq_lock(struct irq_data * data)105 static void max8998_irq_lock(struct irq_data *data)
106 {
107 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
108
109 mutex_lock(&max8998->irqlock);
110 }
111
max8998_irq_sync_unlock(struct irq_data * data)112 static void max8998_irq_sync_unlock(struct irq_data *data)
113 {
114 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
115 int i;
116
117 for (i = 0; i < ARRAY_SIZE(max8998->irq_masks_cur); i++) {
118 /*
119 * If there's been a change in the mask write it back
120 * to the hardware.
121 */
122 if (max8998->irq_masks_cur[i] != max8998->irq_masks_cache[i]) {
123 max8998->irq_masks_cache[i] = max8998->irq_masks_cur[i];
124 max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i,
125 max8998->irq_masks_cur[i]);
126 }
127 }
128
129 mutex_unlock(&max8998->irqlock);
130 }
131
max8998_irq_unmask(struct irq_data * data)132 static void max8998_irq_unmask(struct irq_data *data)
133 {
134 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
135 struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998,
136 data->irq);
137
138 max8998->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
139 }
140
max8998_irq_mask(struct irq_data * data)141 static void max8998_irq_mask(struct irq_data *data)
142 {
143 struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
144 struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998,
145 data->irq);
146
147 max8998->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
148 }
149
150 static struct irq_chip max8998_irq_chip = {
151 .name = "max8998",
152 .irq_bus_lock = max8998_irq_lock,
153 .irq_bus_sync_unlock = max8998_irq_sync_unlock,
154 .irq_mask = max8998_irq_mask,
155 .irq_unmask = max8998_irq_unmask,
156 };
157
max8998_irq_thread(int irq,void * data)158 static irqreturn_t max8998_irq_thread(int irq, void *data)
159 {
160 struct max8998_dev *max8998 = data;
161 u8 irq_reg[MAX8998_NUM_IRQ_REGS];
162 int ret;
163 int i;
164
165 ret = max8998_bulk_read(max8998->i2c, MAX8998_REG_IRQ1,
166 MAX8998_NUM_IRQ_REGS, irq_reg);
167 if (ret < 0) {
168 dev_err(max8998->dev, "Failed to read interrupt register: %d\n",
169 ret);
170 return IRQ_NONE;
171 }
172
173 /* Apply masking */
174 for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++)
175 irq_reg[i] &= ~max8998->irq_masks_cur[i];
176
177 /* Report */
178 for (i = 0; i < MAX8998_IRQ_NR; i++) {
179 if (irq_reg[max8998_irqs[i].reg - 1] & max8998_irqs[i].mask)
180 handle_nested_irq(max8998->irq_base + i);
181 }
182
183 return IRQ_HANDLED;
184 }
185
max8998_irq_resume(struct max8998_dev * max8998)186 int max8998_irq_resume(struct max8998_dev *max8998)
187 {
188 if (max8998->irq && max8998->irq_base)
189 max8998_irq_thread(max8998->irq_base, max8998);
190 return 0;
191 }
192
max8998_irq_init(struct max8998_dev * max8998)193 int max8998_irq_init(struct max8998_dev *max8998)
194 {
195 int i;
196 int cur_irq;
197 int ret;
198
199 if (!max8998->irq) {
200 dev_warn(max8998->dev,
201 "No interrupt specified, no interrupts\n");
202 max8998->irq_base = 0;
203 return 0;
204 }
205
206 if (!max8998->irq_base) {
207 dev_err(max8998->dev,
208 "No interrupt base specified, no interrupts\n");
209 return 0;
210 }
211
212 mutex_init(&max8998->irqlock);
213
214 /* Mask the individual interrupt sources */
215 for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++) {
216 max8998->irq_masks_cur[i] = 0xff;
217 max8998->irq_masks_cache[i] = 0xff;
218 max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i, 0xff);
219 }
220
221 max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM1, 0xff);
222 max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM2, 0xff);
223
224 /* register with genirq */
225 for (i = 0; i < MAX8998_IRQ_NR; i++) {
226 cur_irq = i + max8998->irq_base;
227 irq_set_chip_data(cur_irq, max8998);
228 irq_set_chip_and_handler(cur_irq, &max8998_irq_chip,
229 handle_edge_irq);
230 irq_set_nested_thread(cur_irq, 1);
231 #ifdef CONFIG_ARM
232 set_irq_flags(cur_irq, IRQF_VALID);
233 #else
234 irq_set_noprobe(cur_irq);
235 #endif
236 }
237
238 ret = request_threaded_irq(max8998->irq, NULL, max8998_irq_thread,
239 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
240 "max8998-irq", max8998);
241 if (ret) {
242 dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
243 max8998->irq, ret);
244 return ret;
245 }
246
247 if (!max8998->ono)
248 return 0;
249
250 ret = request_threaded_irq(max8998->ono, NULL, max8998_irq_thread,
251 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
252 IRQF_ONESHOT, "max8998-ono", max8998);
253 if (ret)
254 dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
255 max8998->ono, ret);
256
257 return 0;
258 }
259
max8998_irq_exit(struct max8998_dev * max8998)260 void max8998_irq_exit(struct max8998_dev *max8998)
261 {
262 if (max8998->ono)
263 free_irq(max8998->ono, max8998);
264
265 if (max8998->irq)
266 free_irq(max8998->irq, max8998);
267 }
268