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regmap: irq: call pm_runtime_put in pm_runtime_get_sync failed case
[linux-2.6.git] / drivers / rtc / rtc-max8925.c
bloba0c8265646d246981d51e8779706e924b8ad344c
1 /*
2 * RTC driver for Maxim MAX8925
3 *
4 * Copyright (C) 2009-2010 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 #include <linux/module.h>
13 #include <linux/i2c.h>
14 #include <linux/slab.h>
15 #include <linux/rtc.h>
16 #include <linux/platform_device.h>
17 #include <linux/mfd/max8925.h>
18
19 enum {
20 RTC_SEC = 0,
21 RTC_MIN,
22 RTC_HOUR,
23 RTC_WEEKDAY,
24 RTC_DATE,
25 RTC_MONTH,
26 RTC_YEAR1,
27 RTC_YEAR2,
28 };
29
30 #define MAX8925_RTC_SEC 0x00
31 #define MAX8925_RTC_MIN 0x01
32 #define MAX8925_RTC_HOUR 0x02
33 #define MAX8925_RTC_WEEKDAY 0x03
34 #define MAX8925_RTC_DATE 0x04
35 #define MAX8925_RTC_MONTH 0x05
36 #define MAX8925_RTC_YEAR1 0x06
37 #define MAX8925_RTC_YEAR2 0x07
38 #define MAX8925_ALARM0_SEC 0x08
39 #define MAX8925_ALARM0_MIN 0x09
40 #define MAX8925_ALARM0_HOUR 0x0a
41 #define MAX8925_ALARM0_WEEKDAY 0x0b
42 #define MAX8925_ALARM0_DATE 0x0c
43 #define MAX8925_ALARM0_MON 0x0d
44 #define MAX8925_ALARM0_YEAR1 0x0e
45 #define MAX8925_ALARM0_YEAR2 0x0f
46 #define MAX8925_ALARM1_SEC 0x10
47 #define MAX8925_ALARM1_MIN 0x11
48 #define MAX8925_ALARM1_HOUR 0x12
49 #define MAX8925_ALARM1_WEEKDAY 0x13
50 #define MAX8925_ALARM1_DATE 0x14
51 #define MAX8925_ALARM1_MON 0x15
52 #define MAX8925_ALARM1_YEAR1 0x16
53 #define MAX8925_ALARM1_YEAR2 0x17
54 #define MAX8925_RTC_CNTL 0x1b
55 #define MAX8925_RTC_STATUS 0x20
56
57 #define TIME_NUM 8
58 #define ALARM_1SEC (1 << 7)
59 #define HOUR_12 (1 << 7)
60 #define HOUR_AM_PM (1 << 5)
61 #define ALARM0_IRQ (1 << 3)
62 #define ALARM1_IRQ (1 << 2)
63 #define ALARM0_STATUS (1 << 2)
64 #define ALARM1_STATUS (1 << 1)
65
66
67 struct max8925_rtc_info {
68 struct rtc_device *rtc_dev;
69 struct max8925_chip *chip;
70 struct i2c_client *rtc;
71 struct device *dev;
72 int irq;
73 };
74
75 static irqreturn_t rtc_update_handler(int irq, void *data)
76 {
77 struct max8925_rtc_info *info = (struct max8925_rtc_info *)data;
78
79 /* disable ALARM0 except for 1SEC alarm */
80 max8925_set_bits(info->rtc, MAX8925_ALARM0_CNTL, 0x7f, 0);
81 rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
82 return IRQ_HANDLED;
83 }
84
85 static int tm_calc(struct rtc_time *tm, unsigned char *buf, int len)
86 {
87 if (len < TIME_NUM)
88 return -EINVAL;
89 tm->tm_year = (buf[RTC_YEAR2] >> 4) * 1000
90 + (buf[RTC_YEAR2] & 0xf) * 100
91 + (buf[RTC_YEAR1] >> 4) * 10
92 + (buf[RTC_YEAR1] & 0xf);
93 tm->tm_year -= 1900;
94 tm->tm_mon = ((buf[RTC_MONTH] >> 4) & 0x01) * 10
95 + (buf[RTC_MONTH] & 0x0f);
96 tm->tm_mday = ((buf[RTC_DATE] >> 4) & 0x03) * 10
97 + (buf[RTC_DATE] & 0x0f);
98 tm->tm_wday = buf[RTC_WEEKDAY] & 0x07;
99 if (buf[RTC_HOUR] & HOUR_12) {
100 tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x1) * 10
101 + (buf[RTC_HOUR] & 0x0f);
102 if (buf[RTC_HOUR] & HOUR_AM_PM)
103 tm->tm_hour += 12;
104 } else
105 tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x03) * 10
106 + (buf[RTC_HOUR] & 0x0f);
107 tm->tm_min = ((buf[RTC_MIN] >> 4) & 0x7) * 10
108 + (buf[RTC_MIN] & 0x0f);
109 tm->tm_sec = ((buf[RTC_SEC] >> 4) & 0x7) * 10
110 + (buf[RTC_SEC] & 0x0f);
111 return 0;
112 }
113
114 static int data_calc(unsigned char *buf, struct rtc_time *tm, int len)
115 {
116 unsigned char high, low;
117
118 if (len < TIME_NUM)
119 return -EINVAL;
120
121 high = (tm->tm_year + 1900) / 1000;
122 low = (tm->tm_year + 1900) / 100;
123 low = low - high * 10;
124 buf[RTC_YEAR2] = (high << 4) + low;
125 high = (tm->tm_year + 1900) / 10;
126 low = tm->tm_year + 1900;
127 low = low - high * 10;
128 high = high - (high / 10) * 10;
129 buf[RTC_YEAR1] = (high << 4) + low;
130 high = tm->tm_mon / 10;
131 low = tm->tm_mon;
132 low = low - high * 10;
133 buf[RTC_MONTH] = (high << 4) + low;
134 high = tm->tm_mday / 10;
135 low = tm->tm_mday;
136 low = low - high * 10;
137 buf[RTC_DATE] = (high << 4) + low;
138 buf[RTC_WEEKDAY] = tm->tm_wday;
139 high = tm->tm_hour / 10;
140 low = tm->tm_hour;
141 low = low - high * 10;
142 buf[RTC_HOUR] = (high << 4) + low;
143 high = tm->tm_min / 10;
144 low = tm->tm_min;
145 low = low - high * 10;
146 buf[RTC_MIN] = (high << 4) + low;
147 high = tm->tm_sec / 10;
148 low = tm->tm_sec;
149 low = low - high * 10;
150 buf[RTC_SEC] = (high << 4) + low;
151 return 0;
152 }
153
154 static int max8925_rtc_read_time(struct device *dev, struct rtc_time *tm)
155 {
156 struct max8925_rtc_info *info = dev_get_drvdata(dev);
157 unsigned char buf[TIME_NUM];
158 int ret;
159
160 ret = max8925_bulk_read(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf);
161 if (ret < 0)
162 goto out;
163 ret = tm_calc(tm, buf, TIME_NUM);
164 out:
165 return ret;
166 }
167
168 static int max8925_rtc_set_time(struct device *dev, struct rtc_time *tm)
169 {
170 struct max8925_rtc_info *info = dev_get_drvdata(dev);
171 unsigned char buf[TIME_NUM];
172 int ret;
173
174 ret = data_calc(buf, tm, TIME_NUM);
175 if (ret < 0)
176 goto out;
177 ret = max8925_bulk_write(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf);
178 out:
179 return ret;
180 }
181
182 static int max8925_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
183 {
184 struct max8925_rtc_info *info = dev_get_drvdata(dev);
185 unsigned char buf[TIME_NUM];
186 int ret;
187
188 ret = max8925_bulk_read(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf);
189 if (ret < 0)
190 goto out;
191 ret = tm_calc(&alrm->time, buf, TIME_NUM);
192 if (ret < 0)
193 goto out;
194 ret = max8925_reg_read(info->rtc, MAX8925_RTC_IRQ_MASK);
195 if (ret < 0)
196 goto out;
197 if (ret & ALARM0_IRQ) {
198 alrm->enabled = 0;
199 } else {
200 ret = max8925_reg_read(info->rtc, MAX8925_ALARM0_CNTL);
201 if (ret < 0)
202 goto out;
203 if (!ret)
204 alrm->enabled = 0;
205 else
206 alrm->enabled = 1;
207 }
208 ret = max8925_reg_read(info->rtc, MAX8925_RTC_STATUS);
209 if (ret < 0)
210 goto out;
211 if (ret & ALARM0_STATUS)
212 alrm->pending = 1;
213 else
214 alrm->pending = 0;
215 return 0;
216 out:
217 return ret;
218 }
219
220 static int max8925_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
221 {
222 struct max8925_rtc_info *info = dev_get_drvdata(dev);
223 unsigned char buf[TIME_NUM];
224 int ret;
225
226 ret = data_calc(buf, &alrm->time, TIME_NUM);
227 if (ret < 0)
228 goto out;
229 ret = max8925_bulk_write(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf);
230 if (ret < 0)
231 goto out;
232 if (alrm->enabled)
233 /* only enable alarm on year/month/day/hour/min/sec */
234 ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x77);
235 else
236 ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x0);
237 if (ret < 0)
238 goto out;
239 out:
240 return ret;
241 }
242
243 static const struct rtc_class_ops max8925_rtc_ops = {
244 .read_time = max8925_rtc_read_time,
245 .set_time = max8925_rtc_set_time,
246 .read_alarm = max8925_rtc_read_alarm,
247 .set_alarm = max8925_rtc_set_alarm,
248 };
249
250 static int max8925_rtc_probe(struct platform_device *pdev)
251 {
252 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
253 struct max8925_rtc_info *info;
254 int ret;
255
256 info = kzalloc(sizeof(struct max8925_rtc_info), GFP_KERNEL);
257 if (!info)
258 return -ENOMEM;
259 info->chip = chip;
260 info->rtc = chip->rtc;
261 info->dev = &pdev->dev;
262 info->irq = platform_get_irq(pdev, 0);
263
264 ret = request_threaded_irq(info->irq, NULL, rtc_update_handler,
265 IRQF_ONESHOT, "rtc-alarm0", info);
266 if (ret < 0) {
267 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
268 info->irq, ret);
269 goto out_irq;
270 }
271
272 dev_set_drvdata(&pdev->dev, info);
273 /* XXX - isn't this redundant? */
274 platform_set_drvdata(pdev, info);
275
276 device_init_wakeup(&pdev->dev, 1);
277
278 info->rtc_dev = rtc_device_register("max8925-rtc", &pdev->dev,
279 &max8925_rtc_ops, THIS_MODULE);
280 ret = PTR_ERR(info->rtc_dev);
281 if (IS_ERR(info->rtc_dev)) {
282 dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
283 goto out_rtc;
284 }
285
286 return 0;
287 out_rtc:
288 platform_set_drvdata(pdev, NULL);
289 free_irq(info->irq, info);
290 out_irq:
291 kfree(info);
292 return ret;
293 }
294
295 static int max8925_rtc_remove(struct platform_device *pdev)
296 {
297 struct max8925_rtc_info *info = platform_get_drvdata(pdev);
298
299 if (info) {
300 free_irq(info->irq, info);
301 rtc_device_unregister(info->rtc_dev);
302 kfree(info);
303 }
304 return 0;
305 }
306
307 #ifdef CONFIG_PM_SLEEP
308 static int max8925_rtc_suspend(struct device *dev)
309 {
310 struct platform_device *pdev = to_platform_device(dev);
311 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
312
313 if (device_may_wakeup(dev))
314 chip->wakeup_flag |= 1 << MAX8925_IRQ_RTC_ALARM0;
315 return 0;
316 }
317 static int max8925_rtc_resume(struct device *dev)
318 {
319 struct platform_device *pdev = to_platform_device(dev);
320 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
321
322 if (device_may_wakeup(dev))
323 chip->wakeup_flag &= ~(1 << MAX8925_IRQ_RTC_ALARM0);
324 return 0;
325 }
326 #endif
327
328 static SIMPLE_DEV_PM_OPS(max8925_rtc_pm_ops, max8925_rtc_suspend, max8925_rtc_resume);
329
330 static struct platform_driver max8925_rtc_driver = {
331 .driver = {
332 .name = "max8925-rtc",
333 .owner = THIS_MODULE,
334 .pm = &max8925_rtc_pm_ops,
335 },
336 .probe = max8925_rtc_probe,
337 .remove = max8925_rtc_remove,
338 };
339
340 module_platform_driver(max8925_rtc_driver);
341
342 MODULE_DESCRIPTION("Maxim MAX8925 RTC driver");
343 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
344 MODULE_LICENSE("GPL");
345
Linus' kernel tree