1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // max8997-irq.c - Interrupt controller support for MAX8997
4 //
5 // Copyright (C) 2011 Samsung Electronics Co.Ltd
6 // MyungJoo Ham <myungjoo.ham@samsung.com>
7 //
8 // This driver is based on max8998-irq.c
9
10 #include <linux/err.h>
11 #include <linux/irq.h>
12 #include <linux/interrupt.h>
13 #include <linux/mfd/max8997.h>
14 #include <linux/mfd/max8997-private.h>
15
16 static const u8 max8997_mask_reg[] = {
17 [PMIC_INT1] = MAX8997_REG_INT1MSK,
18 [PMIC_INT2] = MAX8997_REG_INT2MSK,
19 [PMIC_INT3] = MAX8997_REG_INT3MSK,
20 [PMIC_INT4] = MAX8997_REG_INT4MSK,
21 [FUEL_GAUGE] = MAX8997_REG_INVALID,
22 [MUIC_INT1] = MAX8997_MUIC_REG_INTMASK1,
23 [MUIC_INT2] = MAX8997_MUIC_REG_INTMASK2,
24 [MUIC_INT3] = MAX8997_MUIC_REG_INTMASK3,
25 [GPIO_LOW] = MAX8997_REG_INVALID,
26 [GPIO_HI] = MAX8997_REG_INVALID,
27 [FLASH_STATUS] = MAX8997_REG_INVALID,
28 };
29
get_i2c(struct max8997_dev * max8997,enum max8997_irq_source src)30 static struct i2c_client *get_i2c(struct max8997_dev *max8997,
31 enum max8997_irq_source src)
32 {
33 switch (src) {
34 case PMIC_INT1 ... PMIC_INT4:
35 return max8997->i2c;
36 case FUEL_GAUGE:
37 return NULL;
38 case MUIC_INT1 ... MUIC_INT3:
39 return max8997->muic;
40 case GPIO_LOW ... GPIO_HI:
41 return max8997->i2c;
42 case FLASH_STATUS:
43 return max8997->i2c;
44 default:
45 return ERR_PTR(-EINVAL);
46 }
47 }
48
49 struct max8997_irq_data {
50 int mask;
51 enum max8997_irq_source group;
52 };
53
54 #define DECLARE_IRQ(idx, _group, _mask) \
55 [(idx)] = { .group = (_group), .mask = (_mask) }
56 static const struct max8997_irq_data max8997_irqs[] = {
57 DECLARE_IRQ(MAX8997_PMICIRQ_PWRONR, PMIC_INT1, 1 << 0),
58 DECLARE_IRQ(MAX8997_PMICIRQ_PWRONF, PMIC_INT1, 1 << 1),
59 DECLARE_IRQ(MAX8997_PMICIRQ_PWRON1SEC, PMIC_INT1, 1 << 3),
60 DECLARE_IRQ(MAX8997_PMICIRQ_JIGONR, PMIC_INT1, 1 << 4),
61 DECLARE_IRQ(MAX8997_PMICIRQ_JIGONF, PMIC_INT1, 1 << 5),
62 DECLARE_IRQ(MAX8997_PMICIRQ_LOWBAT2, PMIC_INT1, 1 << 6),
63 DECLARE_IRQ(MAX8997_PMICIRQ_LOWBAT1, PMIC_INT1, 1 << 7),
64
65 DECLARE_IRQ(MAX8997_PMICIRQ_JIGR, PMIC_INT2, 1 << 0),
66 DECLARE_IRQ(MAX8997_PMICIRQ_JIGF, PMIC_INT2, 1 << 1),
67 DECLARE_IRQ(MAX8997_PMICIRQ_MR, PMIC_INT2, 1 << 2),
68 DECLARE_IRQ(MAX8997_PMICIRQ_DVS1OK, PMIC_INT2, 1 << 3),
69 DECLARE_IRQ(MAX8997_PMICIRQ_DVS2OK, PMIC_INT2, 1 << 4),
70 DECLARE_IRQ(MAX8997_PMICIRQ_DVS3OK, PMIC_INT2, 1 << 5),
71 DECLARE_IRQ(MAX8997_PMICIRQ_DVS4OK, PMIC_INT2, 1 << 6),
72
73 DECLARE_IRQ(MAX8997_PMICIRQ_CHGINS, PMIC_INT3, 1 << 0),
74 DECLARE_IRQ(MAX8997_PMICIRQ_CHGRM, PMIC_INT3, 1 << 1),
75 DECLARE_IRQ(MAX8997_PMICIRQ_DCINOVP, PMIC_INT3, 1 << 2),
76 DECLARE_IRQ(MAX8997_PMICIRQ_TOPOFFR, PMIC_INT3, 1 << 3),
77 DECLARE_IRQ(MAX8997_PMICIRQ_CHGRSTF, PMIC_INT3, 1 << 5),
78 DECLARE_IRQ(MAX8997_PMICIRQ_MBCHGTMEXPD, PMIC_INT3, 1 << 7),
79
80 DECLARE_IRQ(MAX8997_PMICIRQ_RTC60S, PMIC_INT4, 1 << 0),
81 DECLARE_IRQ(MAX8997_PMICIRQ_RTCA1, PMIC_INT4, 1 << 1),
82 DECLARE_IRQ(MAX8997_PMICIRQ_RTCA2, PMIC_INT4, 1 << 2),
83 DECLARE_IRQ(MAX8997_PMICIRQ_SMPL_INT, PMIC_INT4, 1 << 3),
84 DECLARE_IRQ(MAX8997_PMICIRQ_RTC1S, PMIC_INT4, 1 << 4),
85 DECLARE_IRQ(MAX8997_PMICIRQ_WTSR, PMIC_INT4, 1 << 5),
86
87 DECLARE_IRQ(MAX8997_MUICIRQ_ADCError, MUIC_INT1, 1 << 2),
88 DECLARE_IRQ(MAX8997_MUICIRQ_ADCLow, MUIC_INT1, 1 << 1),
89 DECLARE_IRQ(MAX8997_MUICIRQ_ADC, MUIC_INT1, 1 << 0),
90
91 DECLARE_IRQ(MAX8997_MUICIRQ_VBVolt, MUIC_INT2, 1 << 4),
92 DECLARE_IRQ(MAX8997_MUICIRQ_DBChg, MUIC_INT2, 1 << 3),
93 DECLARE_IRQ(MAX8997_MUICIRQ_DCDTmr, MUIC_INT2, 1 << 2),
94 DECLARE_IRQ(MAX8997_MUICIRQ_ChgDetRun, MUIC_INT2, 1 << 1),
95 DECLARE_IRQ(MAX8997_MUICIRQ_ChgTyp, MUIC_INT2, 1 << 0),
96
97 DECLARE_IRQ(MAX8997_MUICIRQ_OVP, MUIC_INT3, 1 << 2),
98 };
99
max8997_irq_lock(struct irq_data * data)100 static void max8997_irq_lock(struct irq_data *data)
101 {
102 struct max8997_dev *max8997 = irq_data_get_irq_chip_data(data);
103
104 mutex_lock(&max8997->irqlock);
105 }
106
max8997_irq_sync_unlock(struct irq_data * data)107 static void max8997_irq_sync_unlock(struct irq_data *data)
108 {
109 struct max8997_dev *max8997 = irq_data_get_irq_chip_data(data);
110 int i;
111
112 for (i = 0; i < MAX8997_IRQ_GROUP_NR; i++) {
113 u8 mask_reg = max8997_mask_reg[i];
114 struct i2c_client *i2c = get_i2c(max8997, i);
115
116 if (mask_reg == MAX8997_REG_INVALID ||
117 IS_ERR_OR_NULL(i2c))
118 continue;
119 max8997->irq_masks_cache[i] = max8997->irq_masks_cur[i];
120
121 max8997_write_reg(i2c, max8997_mask_reg[i],
122 max8997->irq_masks_cur[i]);
123 }
124
125 mutex_unlock(&max8997->irqlock);
126 }
127
128 inline static const struct max8997_irq_data *
irq_to_max8997_irq(struct max8997_dev * max8997,struct irq_data * data)129 irq_to_max8997_irq(struct max8997_dev *max8997, struct irq_data *data)
130 {
131 return &max8997_irqs[data->hwirq];
132 }
133
max8997_irq_mask(struct irq_data * data)134 static void max8997_irq_mask(struct irq_data *data)
135 {
136 struct max8997_dev *max8997 = irq_data_get_irq_chip_data(data);
137 const struct max8997_irq_data *irq_data = irq_to_max8997_irq(max8997,
138 data);
139
140 max8997->irq_masks_cur[irq_data->group] |= irq_data->mask;
141 }
142
max8997_irq_unmask(struct irq_data * data)143 static void max8997_irq_unmask(struct irq_data *data)
144 {
145 struct max8997_dev *max8997 = irq_data_get_irq_chip_data(data);
146 const struct max8997_irq_data *irq_data = irq_to_max8997_irq(max8997,
147 data);
148
149 max8997->irq_masks_cur[irq_data->group] &= ~irq_data->mask;
150 }
151
152 static struct irq_chip max8997_irq_chip = {
153 .name = "max8997",
154 .irq_bus_lock = max8997_irq_lock,
155 .irq_bus_sync_unlock = max8997_irq_sync_unlock,
156 .irq_mask = max8997_irq_mask,
157 .irq_unmask = max8997_irq_unmask,
158 };
159
160 #define MAX8997_IRQSRC_PMIC (1 << 1)
161 #define MAX8997_IRQSRC_FUELGAUGE (1 << 2)
162 #define MAX8997_IRQSRC_MUIC (1 << 3)
163 #define MAX8997_IRQSRC_GPIO (1 << 4)
164 #define MAX8997_IRQSRC_FLASH (1 << 5)
max8997_irq_thread(int irq,void * data)165 static irqreturn_t max8997_irq_thread(int irq, void *data)
166 {
167 struct max8997_dev *max8997 = data;
168 u8 irq_reg[MAX8997_IRQ_GROUP_NR] = {};
169 u8 irq_src;
170 int ret;
171 int i, cur_irq;
172
173 ret = max8997_read_reg(max8997->i2c, MAX8997_REG_INTSRC, &irq_src);
174 if (ret < 0) {
175 dev_err(max8997->dev, "Failed to read interrupt source: %d\n",
176 ret);
177 return IRQ_NONE;
178 }
179
180 if (irq_src & MAX8997_IRQSRC_PMIC) {
181 /* PMIC INT1 ~ INT4 */
182 max8997_bulk_read(max8997->i2c, MAX8997_REG_INT1, 4,
183 &irq_reg[PMIC_INT1]);
184 }
185 if (irq_src & MAX8997_IRQSRC_FUELGAUGE) {
186 /*
187 * TODO: FUEL GAUGE
188 *
189 * This is to be supported by Max17042 driver. When
190 * an interrupt incurs here, it should be relayed to a
191 * Max17042 device that is connected (probably by
192 * platform-data). However, we do not have interrupt
193 * handling in Max17042 driver currently. The Max17042 IRQ
194 * driver should be ready to be used as a stand-alone device and
195 * a Max8997-dependent device. Because it is not ready in
196 * Max17042-side and it is not too critical in operating
197 * Max8997, we do not implement this in initial releases.
198 */
199 irq_reg[FUEL_GAUGE] = 0;
200 }
201 if (irq_src & MAX8997_IRQSRC_MUIC) {
202 /* MUIC INT1 ~ INT3 */
203 max8997_bulk_read(max8997->muic, MAX8997_MUIC_REG_INT1, 3,
204 &irq_reg[MUIC_INT1]);
205 }
206 if (irq_src & MAX8997_IRQSRC_GPIO) {
207 /* GPIO Interrupt */
208 u8 gpio_info[MAX8997_NUM_GPIO];
209
210 irq_reg[GPIO_LOW] = 0;
211 irq_reg[GPIO_HI] = 0;
212
213 max8997_bulk_read(max8997->i2c, MAX8997_REG_GPIOCNTL1,
214 MAX8997_NUM_GPIO, gpio_info);
215 for (i = 0; i < MAX8997_NUM_GPIO; i++) {
216 bool interrupt = false;
217
218 switch (gpio_info[i] & MAX8997_GPIO_INT_MASK) {
219 case MAX8997_GPIO_INT_BOTH:
220 if (max8997->gpio_status[i] != gpio_info[i])
221 interrupt = true;
222 break;
223 case MAX8997_GPIO_INT_RISE:
224 if ((max8997->gpio_status[i] != gpio_info[i]) &&
225 (gpio_info[i] & MAX8997_GPIO_DATA_MASK))
226 interrupt = true;
227 break;
228 case MAX8997_GPIO_INT_FALL:
229 if ((max8997->gpio_status[i] != gpio_info[i]) &&
230 !(gpio_info[i] & MAX8997_GPIO_DATA_MASK))
231 interrupt = true;
232 break;
233 default:
234 break;
235 }
236
237 if (interrupt) {
238 if (i < 8)
239 irq_reg[GPIO_LOW] |= (1 << i);
240 else
241 irq_reg[GPIO_HI] |= (1 << (i - 8));
242 }
243
244 }
245 }
246 if (irq_src & MAX8997_IRQSRC_FLASH) {
247 /* Flash Status Interrupt */
248 ret = max8997_read_reg(max8997->i2c, MAX8997_REG_FLASHSTATUS,
249 &irq_reg[FLASH_STATUS]);
250 }
251
252 /* Apply masking */
253 for (i = 0; i < MAX8997_IRQ_GROUP_NR; i++)
254 irq_reg[i] &= ~max8997->irq_masks_cur[i];
255
256 /* Report */
257 for (i = 0; i < MAX8997_IRQ_NR; i++) {
258 if (irq_reg[max8997_irqs[i].group] & max8997_irqs[i].mask) {
259 cur_irq = irq_find_mapping(max8997->irq_domain, i);
260 if (cur_irq)
261 handle_nested_irq(cur_irq);
262 }
263 }
264
265 return IRQ_HANDLED;
266 }
267
max8997_irq_resume(struct max8997_dev * max8997)268 int max8997_irq_resume(struct max8997_dev *max8997)
269 {
270 if (max8997->irq && max8997->irq_domain)
271 max8997_irq_thread(0, max8997);
272 return 0;
273 }
274
max8997_irq_domain_map(struct irq_domain * d,unsigned int irq,irq_hw_number_t hw)275 static int max8997_irq_domain_map(struct irq_domain *d, unsigned int irq,
276 irq_hw_number_t hw)
277 {
278 struct max8997_dev *max8997 = d->host_data;
279
280 irq_set_chip_data(irq, max8997);
281 irq_set_chip_and_handler(irq, &max8997_irq_chip, handle_edge_irq);
282 irq_set_nested_thread(irq, 1);
283 irq_set_noprobe(irq);
284
285 return 0;
286 }
287
288 static const struct irq_domain_ops max8997_irq_domain_ops = {
289 .map = max8997_irq_domain_map,
290 };
291
max8997_irq_init(struct max8997_dev * max8997)292 int max8997_irq_init(struct max8997_dev *max8997)
293 {
294 struct irq_domain *domain;
295 int i;
296 int ret;
297 u8 val;
298
299 if (!max8997->irq) {
300 dev_warn(max8997->dev, "No interrupt specified.\n");
301 return 0;
302 }
303
304 mutex_init(&max8997->irqlock);
305
306 /* Mask individual interrupt sources */
307 for (i = 0; i < MAX8997_IRQ_GROUP_NR; i++) {
308 struct i2c_client *i2c;
309
310 max8997->irq_masks_cur[i] = 0xff;
311 max8997->irq_masks_cache[i] = 0xff;
312 i2c = get_i2c(max8997, i);
313
314 if (IS_ERR_OR_NULL(i2c))
315 continue;
316 if (max8997_mask_reg[i] == MAX8997_REG_INVALID)
317 continue;
318
319 max8997_write_reg(i2c, max8997_mask_reg[i], 0xff);
320 }
321
322 for (i = 0; i < MAX8997_NUM_GPIO; i++) {
323 max8997->gpio_status[i] = (max8997_read_reg(max8997->i2c,
324 MAX8997_REG_GPIOCNTL1 + i,
325 &val)
326 & MAX8997_GPIO_DATA_MASK) ?
327 true : false;
328 }
329
330 domain = irq_domain_add_linear(NULL, MAX8997_IRQ_NR,
331 &max8997_irq_domain_ops, max8997);
332 if (!domain) {
333 dev_err(max8997->dev, "could not create irq domain\n");
334 return -ENODEV;
335 }
336 max8997->irq_domain = domain;
337
338 ret = request_threaded_irq(max8997->irq, NULL, max8997_irq_thread,
339 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
340 "max8997-irq", max8997);
341
342 if (ret) {
343 dev_err(max8997->dev, "Failed to request IRQ %d: %d\n",
344 max8997->irq, ret);
345 return ret;
346 }
347
348 if (!max8997->ono)
349 return 0;
350
351 ret = request_threaded_irq(max8997->ono, NULL, max8997_irq_thread,
352 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
353 IRQF_ONESHOT, "max8997-ono", max8997);
354
355 if (ret)
356 dev_err(max8997->dev, "Failed to request ono-IRQ %d: %d\n",
357 max8997->ono, ret);
358
359 return 0;
360 }
361
max8997_irq_exit(struct max8997_dev * max8997)362 void max8997_irq_exit(struct max8997_dev *max8997)
363 {
364 if (max8997->ono)
365 free_irq(max8997->ono, max8997);
366
367 if (max8997->irq)
368 free_irq(max8997->irq, max8997);
369 }
370