1/* NXP PCF50633 Power Management Unit (PMU) driver
2 *
3 * (C) 2006-2008 by Openmoko, Inc.
4 * Author: Harald Welte <laforge@openmoko.org>
5 * Balaji Rao <balajirrao@openmoko.org>
6 * All rights reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 */
14
15#include <linux/interrupt.h>
16#include <linux/kernel.h>
17#include <linux/mutex.h>
18#include <linux/export.h>
19#include <linux/slab.h>
20
21#include <linux/mfd/pcf50633/core.h>
22#include <linux/mfd/pcf50633/mbc.h>
23
24int pcf50633_register_irq(struct pcf50633 *pcf, int irq,
25 void (*handler) (int, void *), void *data)
26{
27 if (irq < 0 || irq >= PCF50633_NUM_IRQ || !handler)
28 return -EINVAL;
29
30 if (WARN_ON(pcf->irq_handler[irq].handler))
31 return -EBUSY;
32
33 mutex_lock(&pcf->lock);
34 pcf->irq_handler[irq].handler = handler;
35 pcf->irq_handler[irq].data = data;
36 mutex_unlock(&pcf->lock);
37
38 return 0;
39}
40EXPORT_SYMBOL_GPL(pcf50633_register_irq);
41
42int pcf50633_free_irq(struct pcf50633 *pcf, int irq)
43{
44 if (irq < 0 || irq >= PCF50633_NUM_IRQ)
45 return -EINVAL;
46
47 mutex_lock(&pcf->lock);
48 pcf->irq_handler[irq].handler = NULL;
49 mutex_unlock(&pcf->lock);
50
51 return 0;
52}
53EXPORT_SYMBOL_GPL(pcf50633_free_irq);
54
55static int __pcf50633_irq_mask_set(struct pcf50633 *pcf, int irq, u8 mask)
56{
57 u8 reg, bit;
58 int idx;
59
60 idx = irq >> 3;
61 reg = PCF50633_REG_INT1M + idx;
62 bit = 1 << (irq & 0x07);
63
64 pcf50633_reg_set_bit_mask(pcf, reg, bit, mask ? bit : 0);
65
66 mutex_lock(&pcf->lock);
67
68 if (mask)
69 pcf->mask_regs[idx] |= bit;
70 else
71 pcf->mask_regs[idx] &= ~bit;
72
73 mutex_unlock(&pcf->lock);
74
75 return 0;
76}
77
78int pcf50633_irq_mask(struct pcf50633 *pcf, int irq)
79{
80 dev_dbg(pcf->dev, "Masking IRQ %d\n", irq);
81
82 return __pcf50633_irq_mask_set(pcf, irq, 1);
83}
84EXPORT_SYMBOL_GPL(pcf50633_irq_mask);
85
86int pcf50633_irq_unmask(struct pcf50633 *pcf, int irq)
87{
88 dev_dbg(pcf->dev, "Unmasking IRQ %d\n", irq);
89
90 return __pcf50633_irq_mask_set(pcf, irq, 0);
91}
92EXPORT_SYMBOL_GPL(pcf50633_irq_unmask);
93
94int pcf50633_irq_mask_get(struct pcf50633 *pcf, int irq)
95{
96 u8 reg, bits;
97
98 reg = irq >> 3;
99 bits = 1 << (irq & 0x07);
100
101 return pcf->mask_regs[reg] & bits;
102}
103EXPORT_SYMBOL_GPL(pcf50633_irq_mask_get);
104
105static void pcf50633_irq_call_handler(struct pcf50633 *pcf, int irq)
106{
107 if (pcf->irq_handler[irq].handler)
108 pcf->irq_handler[irq].handler(irq, pcf->irq_handler[irq].data);
109}
110
111/* Maximum amount of time ONKEY is held before emergency action is taken */
112#define PCF50633_ONKEY1S_TIMEOUT 8
113
114static irqreturn_t pcf50633_irq(int irq, void *data)
115{
116 struct pcf50633 *pcf = data;
117 int ret, i, j;
118 u8 pcf_int[5], chgstat;
119
120 /* Read the 5 INT regs in one transaction */
121 ret = pcf50633_read_block(pcf, PCF50633_REG_INT1,
122 ARRAY_SIZE(pcf_int), pcf_int);
123 if (ret != ARRAY_SIZE(pcf_int)) {
124 dev_err(pcf->dev, "Error reading INT registers\n");
125
126 /*
127 * If this doesn't ACK the interrupt to the chip, we'll be
128 * called once again as we're level triggered.
129 */
130 goto out;
131 }
132
133 /* defeat 8s death from lowsys on A5 */
134 pcf50633_reg_write(pcf, PCF50633_REG_OOCSHDWN, 0x04);
135
136 /* We immediately read the usb and adapter status. We thus make sure
137 * only of USBINS/USBREM IRQ handlers are called */
138 if (pcf_int[0] & (PCF50633_INT1_USBINS | PCF50633_INT1_USBREM)) {
139 chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
140 if (chgstat & (0x3 << 4))
141 pcf_int[0] &= ~PCF50633_INT1_USBREM;
142 else
143 pcf_int[0] &= ~PCF50633_INT1_USBINS;
144 }
145
146 /* Make sure only one of ADPINS or ADPREM is set */
147 if (pcf_int[0] & (PCF50633_INT1_ADPINS | PCF50633_INT1_ADPREM)) {
148 chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
149 if (chgstat & (0x3 << 4))
150 pcf_int[0] &= ~PCF50633_INT1_ADPREM;
151 else
152 pcf_int[0] &= ~PCF50633_INT1_ADPINS;
153 }
154
155 dev_dbg(pcf->dev, "INT1=0x%02x INT2=0x%02x INT3=0x%02x "
156 "INT4=0x%02x INT5=0x%02x\n", pcf_int[0],
157 pcf_int[1], pcf_int[2], pcf_int[3], pcf_int[4]);
158
159 /* Some revisions of the chip don't have a 8s standby mode on
160 * ONKEY1S press. We try to manually do it in such cases. */
161 if ((pcf_int[0] & PCF50633_INT1_SECOND) && pcf->onkey1s_held) {
162 dev_info(pcf->dev, "ONKEY1S held for %d secs\n",
163 pcf->onkey1s_held);
164 if (pcf->onkey1s_held++ == PCF50633_ONKEY1S_TIMEOUT)
165 if (pcf->pdata->force_shutdown)
166 pcf->pdata->force_shutdown(pcf);
167 }
168
169 if (pcf_int[2] & PCF50633_INT3_ONKEY1S) {
170 dev_info(pcf->dev, "ONKEY1S held\n");
171 pcf->onkey1s_held = 1 ;
172
173 /* Unmask IRQ_SECOND */
174 pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT1M,
175 PCF50633_INT1_SECOND);
176
177 /* Unmask IRQ_ONKEYR */
178 pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT2M,
179 PCF50633_INT2_ONKEYR);
180 }
181
182 if ((pcf_int[1] & PCF50633_INT2_ONKEYR) && pcf->onkey1s_held) {
183 pcf->onkey1s_held = 0;
184
185 /* Mask SECOND and ONKEYR interrupts */
186 if (pcf->mask_regs[0] & PCF50633_INT1_SECOND)
187 pcf50633_reg_set_bit_mask(pcf,
188 PCF50633_REG_INT1M,
189 PCF50633_INT1_SECOND,
190 PCF50633_INT1_SECOND);
191
192 if (pcf->mask_regs[1] & PCF50633_INT2_ONKEYR)
193 pcf50633_reg_set_bit_mask(pcf,
194 PCF50633_REG_INT2M,
195 PCF50633_INT2_ONKEYR,
196 PCF50633_INT2_ONKEYR);
197 }
198
199 /* Have we just resumed ? */
200 if (pcf->is_suspended) {
201 pcf->is_suspended = 0;
202
203 /* Set the resume reason filtering out non resumers */
204 for (i = 0; i < ARRAY_SIZE(pcf_int); i++)
205 pcf->resume_reason[i] = pcf_int[i] &
206 pcf->pdata->resumers[i];
207
208 /* Make sure we don't pass on any ONKEY events to
209 * userspace now */
210 pcf_int[1] &= ~(PCF50633_INT2_ONKEYR | PCF50633_INT2_ONKEYF);
211 }
212
213 for (i = 0; i < ARRAY_SIZE(pcf_int); i++) {
214 /* Unset masked interrupts */
215 pcf_int[i] &= ~pcf->mask_regs[i];
216
217 for (j = 0; j < 8 ; j++)
218 if (pcf_int[i] & (1 << j))
219 pcf50633_irq_call_handler(pcf, (i * 8) + j);
220 }
221
222out:
223 return IRQ_HANDLED;
224}
225
226#ifdef CONFIG_PM
227
228int pcf50633_irq_suspend(struct pcf50633 *pcf)
229{
230 int ret;
231 int i;
232 u8 res[5];
233
234
235 /* Make sure our interrupt handlers are not called
236 * henceforth */
237 disable_irq(pcf->irq);
238
239 /* Save the masks */
240 ret = pcf50633_read_block(pcf, PCF50633_REG_INT1M,
241 ARRAY_SIZE(pcf->suspend_irq_masks),
242 pcf->suspend_irq_masks);
243 if (ret < 0) {
244 dev_err(pcf->dev, "error saving irq masks\n");
245 goto out;
246 }
247
248 /* Write wakeup irq masks */
249 for (i = 0; i < ARRAY_SIZE(res); i++)
250 res[i] = ~pcf->pdata->resumers[i];
251
252 ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
253 ARRAY_SIZE(res), &res[0]);
254 if (ret < 0) {
255 dev_err(pcf->dev, "error writing wakeup irq masks\n");
256 goto out;
257 }
258
259 pcf->is_suspended = 1;
260
261out:
262 return ret;
263}
264
265int pcf50633_irq_resume(struct pcf50633 *pcf)
266{
267 int ret;
268
269 /* Write the saved mask registers */
270 ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
271 ARRAY_SIZE(pcf->suspend_irq_masks),
272 pcf->suspend_irq_masks);
273 if (ret < 0)
274 dev_err(pcf->dev, "Error restoring saved suspend masks\n");
275
276 enable_irq(pcf->irq);
277
278 return ret;
279}
280
281#endif
282
283int pcf50633_irq_init(struct pcf50633 *pcf, int irq)
284{
285 int ret;
286
287 pcf->irq = irq;
288
289 /* Enable all interrupts except RTC SECOND */
290 pcf->mask_regs[0] = 0x80;
291 pcf50633_reg_write(pcf, PCF50633_REG_INT1M, pcf->mask_regs[0]);
292 pcf50633_reg_write(pcf, PCF50633_REG_INT2M, 0x00);
293 pcf50633_reg_write(pcf, PCF50633_REG_INT3M, 0x00);
294 pcf50633_reg_write(pcf, PCF50633_REG_INT4M, 0x00);
295 pcf50633_reg_write(pcf, PCF50633_REG_INT5M, 0x00);
296
297 ret = request_threaded_irq(irq, NULL, pcf50633_irq,
298 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
299 "pcf50633", pcf);
300
301 if (ret)
302 dev_err(pcf->dev, "Failed to request IRQ %d\n", ret);
303
304 if (enable_irq_wake(irq) < 0)
305 dev_err(pcf->dev, "IRQ %u cannot be enabled as wake-up source"
306 "in this hardware revision", irq);
307
308 return ret;
309}
310
311void pcf50633_irq_free(struct pcf50633 *pcf)
312{
313 free_irq(pcf->irq, pcf);
314}
315