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380c09f6 LPC |
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> | |
5d4a357d | 18 | #include <linux/export.h> |
380c09f6 LPC |
19 | #include <linux/slab.h> |
20 | ||
21 | #include <linux/mfd/pcf50633/core.h> | |
624e26e0 | 22 | #include <linux/mfd/pcf50633/mbc.h> |
380c09f6 LPC |
23 | |
24 | int 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 | } | |
40 | EXPORT_SYMBOL_GPL(pcf50633_register_irq); | |
41 | ||
42 | int 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 | } | |
53 | EXPORT_SYMBOL_GPL(pcf50633_free_irq); | |
54 | ||
55 | static int __pcf50633_irq_mask_set(struct pcf50633 *pcf, int irq, u8 mask) | |
56 | { | |
57 | u8 reg, bit; | |
58 | int ret = 0, 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 ret; | |
76 | } | |
77 | ||
78 | int 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 | } | |
84 | EXPORT_SYMBOL_GPL(pcf50633_irq_mask); | |
85 | ||
86 | int 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 | } | |
92 | EXPORT_SYMBOL_GPL(pcf50633_irq_unmask); | |
93 | ||
94 | int 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 | } | |
103 | EXPORT_SYMBOL_GPL(pcf50633_irq_mask_get); | |
104 | ||
105 | static 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 | ||
114 | static 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 | ||
222 | out: | |
223 | return IRQ_HANDLED; | |
224 | } | |
225 | ||
226 | #ifdef CONFIG_PM | |
227 | ||
228 | int 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 | ||
261 | out: | |
262 | return ret; | |
263 | } | |
264 | ||
265 | int 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 | ||
283 | int 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 | ||
311 | void pcf50633_irq_free(struct pcf50633 *pcf) | |
312 | { | |
313 | free_irq(pcf->irq, pcf); | |
314 | } |