media: tegra: add supporting for RAW8/RAW10 input and output
[linux-2.6.git] / drivers / rtc / rtc-max8925.c
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 };
73
74 static irqreturn_t rtc_update_handler(int irq, void *data)
75 {
76         struct max8925_rtc_info *info = (struct max8925_rtc_info *)data;
77
78         /* disable ALARM0 except for 1SEC alarm */
79         max8925_set_bits(info->rtc, MAX8925_ALARM0_CNTL, 0x7f, 0);
80         rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
81         return IRQ_HANDLED;
82 }
83
84 static int tm_calc(struct rtc_time *tm, unsigned char *buf, int len)
85 {
86         if (len < TIME_NUM)
87                 return -EINVAL;
88         tm->tm_year = (buf[RTC_YEAR2] >> 4) * 1000
89                         + (buf[RTC_YEAR2] & 0xf) * 100
90                         + (buf[RTC_YEAR1] >> 4) * 10
91                         + (buf[RTC_YEAR1] & 0xf);
92         tm->tm_year -= 1900;
93         tm->tm_mon = ((buf[RTC_MONTH] >> 4) & 0x01) * 10
94                         + (buf[RTC_MONTH] & 0x0f);
95         tm->tm_mday = ((buf[RTC_DATE] >> 4) & 0x03) * 10
96                         + (buf[RTC_DATE] & 0x0f);
97         tm->tm_wday = buf[RTC_WEEKDAY] & 0x07;
98         if (buf[RTC_HOUR] & HOUR_12) {
99                 tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x1) * 10
100                                 + (buf[RTC_HOUR] & 0x0f);
101                 if (buf[RTC_HOUR] & HOUR_AM_PM)
102                         tm->tm_hour += 12;
103         } else
104                 tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x03) * 10
105                                 + (buf[RTC_HOUR] & 0x0f);
106         tm->tm_min = ((buf[RTC_MIN] >> 4) & 0x7) * 10
107                         + (buf[RTC_MIN] & 0x0f);
108         tm->tm_sec = ((buf[RTC_SEC] >> 4) & 0x7) * 10
109                         + (buf[RTC_SEC] & 0x0f);
110         return 0;
111 }
112
113 static int data_calc(unsigned char *buf, struct rtc_time *tm, int len)
114 {
115         unsigned char high, low;
116
117         if (len < TIME_NUM)
118                 return -EINVAL;
119
120         high = (tm->tm_year + 1900) / 1000;
121         low = (tm->tm_year + 1900) / 100;
122         low = low - high * 10;
123         buf[RTC_YEAR2] = (high << 4) + low;
124         high = (tm->tm_year + 1900) / 10;
125         low = tm->tm_year + 1900;
126         low = low - high * 10;
127         high = high - (high / 10) * 10;
128         buf[RTC_YEAR1] = (high << 4) + low;
129         high = tm->tm_mon / 10;
130         low = tm->tm_mon;
131         low = low - high * 10;
132         buf[RTC_MONTH] = (high << 4) + low;
133         high = tm->tm_mday / 10;
134         low = tm->tm_mday;
135         low = low - high * 10;
136         buf[RTC_DATE] = (high << 4) + low;
137         buf[RTC_WEEKDAY] = tm->tm_wday;
138         high = tm->tm_hour / 10;
139         low = tm->tm_hour;
140         low = low - high * 10;
141         buf[RTC_HOUR] = (high << 4) + low;
142         high = tm->tm_min / 10;
143         low = tm->tm_min;
144         low = low - high * 10;
145         buf[RTC_MIN] = (high << 4) + low;
146         high = tm->tm_sec / 10;
147         low = tm->tm_sec;
148         low = low - high * 10;
149         buf[RTC_SEC] = (high << 4) + low;
150         return 0;
151 }
152
153 static int max8925_rtc_read_time(struct device *dev, struct rtc_time *tm)
154 {
155         struct max8925_rtc_info *info = dev_get_drvdata(dev);
156         unsigned char buf[TIME_NUM];
157         int ret;
158
159         ret = max8925_bulk_read(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf);
160         if (ret < 0)
161                 goto out;
162         ret = tm_calc(tm, buf, TIME_NUM);
163 out:
164         return ret;
165 }
166
167 static int max8925_rtc_set_time(struct device *dev, struct rtc_time *tm)
168 {
169         struct max8925_rtc_info *info = dev_get_drvdata(dev);
170         unsigned char buf[TIME_NUM];
171         int ret;
172
173         ret = data_calc(buf, tm, TIME_NUM);
174         if (ret < 0)
175                 goto out;
176         ret = max8925_bulk_write(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf);
177 out:
178         return ret;
179 }
180
181 static int max8925_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
182 {
183         struct max8925_rtc_info *info = dev_get_drvdata(dev);
184         unsigned char buf[TIME_NUM];
185         int ret;
186
187         ret = max8925_bulk_read(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf);
188         if (ret < 0)
189                 goto out;
190         ret = tm_calc(&alrm->time, buf, TIME_NUM);
191         if (ret < 0)
192                 goto out;
193         ret = max8925_reg_read(info->rtc, MAX8925_RTC_IRQ_MASK);
194         if (ret < 0)
195                 goto out;
196         if ((ret & ALARM0_IRQ) == 0)
197                 alrm->enabled = 1;
198         else
199                 alrm->enabled = 0;
200         ret = max8925_reg_read(info->rtc, MAX8925_RTC_STATUS);
201         if (ret < 0)
202                 goto out;
203         if (ret & ALARM0_STATUS)
204                 alrm->pending = 1;
205         else
206                 alrm->pending = 0;
207 out:
208         return ret;
209 }
210
211 static int max8925_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
212 {
213         struct max8925_rtc_info *info = dev_get_drvdata(dev);
214         unsigned char buf[TIME_NUM];
215         int ret;
216
217         ret = data_calc(buf, &alrm->time, TIME_NUM);
218         if (ret < 0)
219                 goto out;
220         ret = max8925_bulk_write(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf);
221         if (ret < 0)
222                 goto out;
223         /* only enable alarm on year/month/day/hour/min/sec */
224         ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x77);
225         if (ret < 0)
226                 goto out;
227 out:
228         return ret;
229 }
230
231 static const struct rtc_class_ops max8925_rtc_ops = {
232         .read_time      = max8925_rtc_read_time,
233         .set_time       = max8925_rtc_set_time,
234         .read_alarm     = max8925_rtc_read_alarm,
235         .set_alarm      = max8925_rtc_set_alarm,
236 };
237
238 static int __devinit max8925_rtc_probe(struct platform_device *pdev)
239 {
240         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
241         struct max8925_rtc_info *info;
242         int irq, ret;
243
244         info = kzalloc(sizeof(struct max8925_rtc_info), GFP_KERNEL);
245         if (!info)
246                 return -ENOMEM;
247         info->chip = chip;
248         info->rtc = chip->rtc;
249         info->dev = &pdev->dev;
250         irq = chip->irq_base + MAX8925_IRQ_RTC_ALARM0;
251
252         ret = request_threaded_irq(irq, NULL, rtc_update_handler,
253                                    IRQF_ONESHOT, "rtc-alarm0", info);
254         if (ret < 0) {
255                 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
256                         irq, ret);
257                 goto out_irq;
258         }
259
260         dev_set_drvdata(&pdev->dev, info);
261         /* XXX - isn't this redundant? */
262         platform_set_drvdata(pdev, info);
263
264         info->rtc_dev = rtc_device_register("max8925-rtc", &pdev->dev,
265                                         &max8925_rtc_ops, THIS_MODULE);
266         ret = PTR_ERR(info->rtc_dev);
267         if (IS_ERR(info->rtc_dev)) {
268                 dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
269                 goto out_rtc;
270         }
271
272         return 0;
273 out_rtc:
274         platform_set_drvdata(pdev, NULL);
275         free_irq(chip->irq_base + MAX8925_IRQ_RTC_ALARM0, info);
276 out_irq:
277         kfree(info);
278         return ret;
279 }
280
281 static int __devexit max8925_rtc_remove(struct platform_device *pdev)
282 {
283         struct max8925_rtc_info *info = platform_get_drvdata(pdev);
284
285         if (info) {
286                 free_irq(info->chip->irq_base + MAX8925_IRQ_RTC_ALARM0, info);
287                 rtc_device_unregister(info->rtc_dev);
288                 kfree(info);
289         }
290         return 0;
291 }
292
293 static struct platform_driver max8925_rtc_driver = {
294         .driver         = {
295                 .name   = "max8925-rtc",
296                 .owner  = THIS_MODULE,
297         },
298         .probe          = max8925_rtc_probe,
299         .remove         = __devexit_p(max8925_rtc_remove),
300 };
301
302 static int __init max8925_rtc_init(void)
303 {
304         return platform_driver_register(&max8925_rtc_driver);
305 }
306 module_init(max8925_rtc_init);
307
308 static void __exit max8925_rtc_exit(void)
309 {
310         platform_driver_unregister(&max8925_rtc_driver);
311 }
312 module_exit(max8925_rtc_exit);
313
314 MODULE_DESCRIPTION("Maxim MAX8925 RTC driver");
315 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
316 MODULE_LICENSE("GPL");
317