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 * |
95 | irq_to_max8998_irq(struct max8998_dev *max8998, struct irq_data *data) |
96 | { |
97 | return &max8998_irqs[data->hwirq]; |
98 | } |
99 | |
100 | static void max8998_irq_lock(struct irq_data *data) |
101 | { |
102 | struct max8998_dev *max8998 = irq_data_get_irq_chip_data(d: data); |
103 | |
104 | mutex_lock(&max8998->irqlock); |
105 | } |
106 | |
107 | static void max8998_irq_sync_unlock(struct irq_data *data) |
108 | { |
109 | struct max8998_dev *max8998 = irq_data_get_irq_chip_data(d: 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(i2c: max8998->i2c, reg: MAX8998_REG_IRQM1 + i, |
120 | value: max8998->irq_masks_cur[i]); |
121 | } |
122 | } |
123 | |
124 | mutex_unlock(lock: &max8998->irqlock); |
125 | } |
126 | |
127 | static void max8998_irq_unmask(struct irq_data *data) |
128 | { |
129 | struct max8998_dev *max8998 = irq_data_get_irq_chip_data(d: 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 | |
135 | static void max8998_irq_mask(struct irq_data *data) |
136 | { |
137 | struct max8998_dev *max8998 = irq_data_get_irq_chip_data(d: 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 | |
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(i2c: max8998->i2c, reg: MAX8998_REG_IRQ1, |
159 | MAX8998_NUM_IRQ_REGS, buf: 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(domain: max8998->irq_domain, hwirq: i); |
174 | if (WARN_ON(!irq)) { |
175 | disable_irq_nosync(irq: max8998->irq); |
176 | return IRQ_NONE; |
177 | } |
178 | handle_nested_irq(irq); |
179 | } |
180 | } |
181 | |
182 | return IRQ_HANDLED; |
183 | } |
184 | |
185 | int max8998_irq_resume(struct max8998_dev *max8998) |
186 | { |
187 | if (max8998->irq && max8998->irq_domain) |
188 | max8998_irq_thread(irq: max8998->irq, data: max8998); |
189 | return 0; |
190 | } |
191 | |
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, data: max8998); |
198 | irq_set_chip_and_handler(irq, chip: &max8998_irq_chip, handle: handle_edge_irq); |
199 | irq_set_nested_thread(irq, nest: 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 | |
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(i2c: max8998->i2c, reg: MAX8998_REG_IRQM1 + i, value: 0xff); |
228 | } |
229 | |
230 | max8998_write_reg(i2c: max8998->i2c, reg: MAX8998_REG_STATUSM1, value: 0xff); |
231 | max8998_write_reg(i2c: max8998->i2c, reg: MAX8998_REG_STATUSM2, value: 0xff); |
232 | |
233 | domain = irq_domain_add_simple(NULL, size: MAX8998_IRQ_NR, |
234 | first_irq: max8998->irq_base, ops: &max8998_irq_domain_ops, host_data: 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(irq: max8998->irq, NULL, thread_fn: max8998_irq_thread, |
242 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
243 | name: "max8998-irq" , dev: 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(irq: max8998->ono, NULL, thread_fn: max8998_irq_thread, |
254 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | |
255 | IRQF_ONESHOT, name: "max8998-ono" , dev: 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 | |
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 | |