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
pcf50633_register_irq(struct pcf50633 * pcf,int irq,void (* handler)(int,void *),void * data)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
pcf50633_free_irq(struct pcf50633 * pcf,int irq)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
__pcf50633_irq_mask_set(struct pcf50633 * pcf,int irq,u8 mask)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
pcf50633_irq_mask(struct pcf50633 * pcf,int irq)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
pcf50633_irq_unmask(struct pcf50633 * pcf,int irq)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
pcf50633_irq_mask_get(struct pcf50633 * pcf,int irq)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
pcf50633_irq_call_handler(struct pcf50633 * pcf,int irq)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
pcf50633_irq(int irq,void * data)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
pcf50633_irq_suspend(struct pcf50633 * pcf)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
pcf50633_irq_resume(struct pcf50633 * pcf)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
pcf50633_irq_init(struct pcf50633 * pcf,int irq)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
pcf50633_irq_free(struct pcf50633 * pcf)306 void pcf50633_irq_free(struct pcf50633 *pcf)
307 {
308 free_irq(pcf->irq, pcf);
309 }
310