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