GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / mfd / pcf50633-irq.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* NXP PCF50633 Power Management Unit (PMU) driver
3  *
4  * (C) 2006-2008 by Openmoko, Inc.
5  * Author: Harald Welte <laforge@openmoko.org>
6  *         Balaji Rao <balajirrao@openmoko.org>
7  * All rights reserved.
8  */
9
10 #include <linux/interrupt.h>
11 #include <linux/kernel.h>
12 #include <linux/mutex.h>
13 #include <linux/export.h>
14 #include <linux/slab.h>
15
16 #include <linux/mfd/pcf50633/core.h>
17 #include <linux/mfd/pcf50633/mbc.h>
18
19 int pcf50633_register_irq(struct pcf50633 *pcf, int irq,
20                         void (*handler) (int, void *), void *data)
21 {
22         if (irq < 0 || irq >= PCF50633_NUM_IRQ || !handler)
23                 return -EINVAL;
24
25         if (WARN_ON(pcf->irq_handler[irq].handler))
26                 return -EBUSY;
27
28         mutex_lock(&pcf->lock);
29         pcf->irq_handler[irq].handler = handler;
30         pcf->irq_handler[irq].data = data;
31         mutex_unlock(&pcf->lock);
32
33         return 0;
34 }
35 EXPORT_SYMBOL_GPL(pcf50633_register_irq);
36
37 int pcf50633_free_irq(struct pcf50633 *pcf, int irq)
38 {
39         if (irq < 0 || irq >= PCF50633_NUM_IRQ)
40                 return -EINVAL;
41
42         mutex_lock(&pcf->lock);
43         pcf->irq_handler[irq].handler = NULL;
44         mutex_unlock(&pcf->lock);
45
46         return 0;
47 }
48 EXPORT_SYMBOL_GPL(pcf50633_free_irq);
49
50 static int __pcf50633_irq_mask_set(struct pcf50633 *pcf, int irq, u8 mask)
51 {
52         u8 reg, bit;
53         int idx;
54
55         idx = irq >> 3;
56         reg = PCF50633_REG_INT1M + idx;
57         bit = 1 << (irq & 0x07);
58
59         pcf50633_reg_set_bit_mask(pcf, reg, bit, mask ? bit : 0);
60
61         mutex_lock(&pcf->lock);
62
63         if (mask)
64                 pcf->mask_regs[idx] |= bit;
65         else
66                 pcf->mask_regs[idx] &= ~bit;
67
68         mutex_unlock(&pcf->lock);
69
70         return 0;
71 }
72
73 int pcf50633_irq_mask(struct pcf50633 *pcf, int irq)
74 {
75         dev_dbg(pcf->dev, "Masking IRQ %d\n", irq);
76
77         return __pcf50633_irq_mask_set(pcf, irq, 1);
78 }
79 EXPORT_SYMBOL_GPL(pcf50633_irq_mask);
80
81 int pcf50633_irq_unmask(struct pcf50633 *pcf, int irq)
82 {
83         dev_dbg(pcf->dev, "Unmasking IRQ %d\n", irq);
84
85         return __pcf50633_irq_mask_set(pcf, irq, 0);
86 }
87 EXPORT_SYMBOL_GPL(pcf50633_irq_unmask);
88
89 int pcf50633_irq_mask_get(struct pcf50633 *pcf, int irq)
90 {
91         u8 reg, bits;
92
93         reg =  irq >> 3;
94         bits = 1 << (irq & 0x07);
95
96         return pcf->mask_regs[reg] & bits;
97 }
98 EXPORT_SYMBOL_GPL(pcf50633_irq_mask_get);
99
100 static void pcf50633_irq_call_handler(struct pcf50633 *pcf, int irq)
101 {
102         if (pcf->irq_handler[irq].handler)
103                 pcf->irq_handler[irq].handler(irq, pcf->irq_handler[irq].data);
104 }
105
106 /* Maximum amount of time ONKEY is held before emergency action is taken */
107 #define PCF50633_ONKEY1S_TIMEOUT 8
108
109 static irqreturn_t pcf50633_irq(int irq, void *data)
110 {
111         struct pcf50633 *pcf = data;
112         int ret, i, j;
113         u8 pcf_int[5], chgstat;
114
115         /* Read the 5 INT regs in one transaction */
116         ret = pcf50633_read_block(pcf, PCF50633_REG_INT1,
117                                                 ARRAY_SIZE(pcf_int), pcf_int);
118         if (ret != ARRAY_SIZE(pcf_int)) {
119                 dev_err(pcf->dev, "Error reading INT registers\n");
120
121                 /*
122                  * If this doesn't ACK the interrupt to the chip, we'll be
123                  * called once again as we're level triggered.
124                  */
125                 goto out;
126         }
127
128         /* defeat 8s death from lowsys on A5 */
129         pcf50633_reg_write(pcf, PCF50633_REG_OOCSHDWN,  0x04);
130
131         /* We immediately read the usb and adapter status. We thus make sure
132          * only of USBINS/USBREM IRQ handlers are called */
133         if (pcf_int[0] & (PCF50633_INT1_USBINS | PCF50633_INT1_USBREM)) {
134                 chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
135                 if (chgstat & (0x3 << 4))
136                         pcf_int[0] &= ~PCF50633_INT1_USBREM;
137                 else
138                         pcf_int[0] &= ~PCF50633_INT1_USBINS;
139         }
140
141         /* Make sure only one of ADPINS or ADPREM is set */
142         if (pcf_int[0] & (PCF50633_INT1_ADPINS | PCF50633_INT1_ADPREM)) {
143                 chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
144                 if (chgstat & (0x3 << 4))
145                         pcf_int[0] &= ~PCF50633_INT1_ADPREM;
146                 else
147                         pcf_int[0] &= ~PCF50633_INT1_ADPINS;
148         }
149
150         dev_dbg(pcf->dev, "INT1=0x%02x INT2=0x%02x INT3=0x%02x "
151                         "INT4=0x%02x INT5=0x%02x\n", pcf_int[0],
152                         pcf_int[1], pcf_int[2], pcf_int[3], pcf_int[4]);
153
154         /* Some revisions of the chip don't have a 8s standby mode on
155          * ONKEY1S press. We try to manually do it in such cases. */
156         if ((pcf_int[0] & PCF50633_INT1_SECOND) && pcf->onkey1s_held) {
157                 dev_info(pcf->dev, "ONKEY1S held for %d secs\n",
158                                                         pcf->onkey1s_held);
159                 if (pcf->onkey1s_held++ == PCF50633_ONKEY1S_TIMEOUT)
160                         if (pcf->pdata->force_shutdown)
161                                 pcf->pdata->force_shutdown(pcf);
162         }
163
164         if (pcf_int[2] & PCF50633_INT3_ONKEY1S) {
165                 dev_info(pcf->dev, "ONKEY1S held\n");
166                 pcf->onkey1s_held = 1 ;
167
168                 /* Unmask IRQ_SECOND */
169                 pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT1M,
170                                                 PCF50633_INT1_SECOND);
171
172                 /* Unmask IRQ_ONKEYR */
173                 pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT2M,
174                                                 PCF50633_INT2_ONKEYR);
175         }
176
177         if ((pcf_int[1] & PCF50633_INT2_ONKEYR) && pcf->onkey1s_held) {
178                 pcf->onkey1s_held = 0;
179
180                 /* Mask SECOND and ONKEYR interrupts */
181                 if (pcf->mask_regs[0] & PCF50633_INT1_SECOND)
182                         pcf50633_reg_set_bit_mask(pcf,
183                                         PCF50633_REG_INT1M,
184                                         PCF50633_INT1_SECOND,
185                                         PCF50633_INT1_SECOND);
186
187                 if (pcf->mask_regs[1] & PCF50633_INT2_ONKEYR)
188                         pcf50633_reg_set_bit_mask(pcf,
189                                         PCF50633_REG_INT2M,
190                                         PCF50633_INT2_ONKEYR,
191                                         PCF50633_INT2_ONKEYR);
192         }
193
194         /* Have we just resumed ? */
195         if (pcf->is_suspended) {
196                 pcf->is_suspended = 0;
197
198                 /* Set the resume reason filtering out non resumers */
199                 for (i = 0; i < ARRAY_SIZE(pcf_int); i++)
200                         pcf->resume_reason[i] = pcf_int[i] &
201                                                 pcf->pdata->resumers[i];
202
203                 /* Make sure we don't pass on any ONKEY events to
204                  * userspace now */
205                 pcf_int[1] &= ~(PCF50633_INT2_ONKEYR | PCF50633_INT2_ONKEYF);
206         }
207
208         for (i = 0; i < ARRAY_SIZE(pcf_int); i++) {
209                 /* Unset masked interrupts */
210                 pcf_int[i] &= ~pcf->mask_regs[i];
211
212                 for (j = 0; j < 8 ; j++)
213                         if (pcf_int[i] & (1 << j))
214                                 pcf50633_irq_call_handler(pcf, (i * 8) + j);
215         }
216
217 out:
218         return IRQ_HANDLED;
219 }
220
221 #ifdef CONFIG_PM
222
223 int pcf50633_irq_suspend(struct pcf50633 *pcf)
224 {
225         int ret;
226         int i;
227         u8 res[5];
228
229
230         /* Make sure our interrupt handlers are not called
231          * henceforth */
232         disable_irq(pcf->irq);
233
234         /* Save the masks */
235         ret = pcf50633_read_block(pcf, PCF50633_REG_INT1M,
236                                 ARRAY_SIZE(pcf->suspend_irq_masks),
237                                         pcf->suspend_irq_masks);
238         if (ret < 0) {
239                 dev_err(pcf->dev, "error saving irq masks\n");
240                 goto out;
241         }
242
243         /* Write wakeup irq masks */
244         for (i = 0; i < ARRAY_SIZE(res); i++)
245                 res[i] = ~pcf->pdata->resumers[i];
246
247         ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
248                                         ARRAY_SIZE(res), &res[0]);
249         if (ret < 0) {
250                 dev_err(pcf->dev, "error writing wakeup irq masks\n");
251                 goto out;
252         }
253
254         pcf->is_suspended = 1;
255
256 out:
257         return ret;
258 }
259
260 int pcf50633_irq_resume(struct pcf50633 *pcf)
261 {
262         int ret;
263
264         /* Write the saved mask registers */
265         ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
266                                 ARRAY_SIZE(pcf->suspend_irq_masks),
267                                         pcf->suspend_irq_masks);
268         if (ret < 0)
269                 dev_err(pcf->dev, "Error restoring saved suspend masks\n");
270
271         enable_irq(pcf->irq);
272
273         return ret;
274 }
275
276 #endif
277
278 int pcf50633_irq_init(struct pcf50633 *pcf, int irq)
279 {
280         int ret;
281
282         pcf->irq = irq;
283
284         /* Enable all interrupts except RTC SECOND */
285         pcf->mask_regs[0] = 0x80;
286         pcf50633_reg_write(pcf, PCF50633_REG_INT1M, pcf->mask_regs[0]);
287         pcf50633_reg_write(pcf, PCF50633_REG_INT2M, 0x00);
288         pcf50633_reg_write(pcf, PCF50633_REG_INT3M, 0x00);
289         pcf50633_reg_write(pcf, PCF50633_REG_INT4M, 0x00);
290         pcf50633_reg_write(pcf, PCF50633_REG_INT5M, 0x00);
291
292         ret = request_threaded_irq(irq, NULL, pcf50633_irq,
293                                         IRQF_TRIGGER_LOW | IRQF_ONESHOT,
294                                         "pcf50633", pcf);
295
296         if (ret)
297                 dev_err(pcf->dev, "Failed to request IRQ %d\n", ret);
298
299         if (enable_irq_wake(irq) < 0)
300                 dev_err(pcf->dev, "IRQ %u cannot be enabled as wake-up source"
301                         "in this hardware revision", irq);
302
303         return ret;
304 }
305
306 void pcf50633_irq_free(struct pcf50633 *pcf)
307 {
308         free_irq(pcf->irq, pcf);
309 }