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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
19enum {
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
67struct 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
74static irqreturn_t rtc_update_handler(int irq, void *data)
75{
76 struct max8925_rtc_info *info = (struct max8925_rtc_info *)data;
77
78
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
84static 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
113static 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
153static 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);
163out:
164 return ret;
165}
166
167static 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);
177out:
178 return ret;
179}
180
181static 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) {
197 alrm->enabled = 0;
198 } else {
199 ret = max8925_reg_read(info->rtc, MAX8925_ALARM0_CNTL);
200 if (ret < 0)
201 goto out;
202 if (!ret)
203 alrm->enabled = 0;
204 else
205 alrm->enabled = 1;
206 }
207 ret = max8925_reg_read(info->rtc, MAX8925_RTC_STATUS);
208 if (ret < 0)
209 goto out;
210 if (ret & ALARM0_STATUS)
211 alrm->pending = 1;
212 else
213 alrm->pending = 0;
214 return 0;
215out:
216 return ret;
217}
218
219static int max8925_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
220{
221 struct max8925_rtc_info *info = dev_get_drvdata(dev);
222 unsigned char buf[TIME_NUM];
223 int ret;
224
225 ret = data_calc(buf, &alrm->time, TIME_NUM);
226 if (ret < 0)
227 goto out;
228 ret = max8925_bulk_write(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf);
229 if (ret < 0)
230 goto out;
231 if (alrm->enabled)
232
233 ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x77);
234 else
235 ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x0);
236 if (ret < 0)
237 goto out;
238out:
239 return ret;
240}
241
242static const struct rtc_class_ops max8925_rtc_ops = {
243 .read_time = max8925_rtc_read_time,
244 .set_time = max8925_rtc_set_time,
245 .read_alarm = max8925_rtc_read_alarm,
246 .set_alarm = max8925_rtc_set_alarm,
247};
248
249static int __devinit max8925_rtc_probe(struct platform_device *pdev)
250{
251 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
252 struct max8925_rtc_info *info;
253 int irq, ret;
254
255 info = kzalloc(sizeof(struct max8925_rtc_info), GFP_KERNEL);
256 if (!info)
257 return -ENOMEM;
258 info->chip = chip;
259 info->rtc = chip->rtc;
260 info->dev = &pdev->dev;
261 irq = chip->irq_base + MAX8925_IRQ_RTC_ALARM0;
262
263 ret = request_threaded_irq(irq, NULL, rtc_update_handler,
264 IRQF_ONESHOT, "rtc-alarm0", info);
265 if (ret < 0) {
266 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
267 irq, ret);
268 goto out_irq;
269 }
270
271 dev_set_drvdata(&pdev->dev, info);
272
273 platform_set_drvdata(pdev, info);
274
275 device_init_wakeup(&pdev->dev, 1);
276
277 info->rtc_dev = rtc_device_register("max8925-rtc", &pdev->dev,
278 &max8925_rtc_ops, THIS_MODULE);
279 ret = PTR_ERR(info->rtc_dev);
280 if (IS_ERR(info->rtc_dev)) {
281 dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
282 goto out_rtc;
283 }
284
285 return 0;
286out_rtc:
287 platform_set_drvdata(pdev, NULL);
288 free_irq(chip->irq_base + MAX8925_IRQ_RTC_ALARM0, info);
289out_irq:
290 kfree(info);
291 return ret;
292}
293
294static int __devexit max8925_rtc_remove(struct platform_device *pdev)
295{
296 struct max8925_rtc_info *info = platform_get_drvdata(pdev);
297
298 if (info) {
299 free_irq(info->chip->irq_base + MAX8925_IRQ_RTC_ALARM0, info);
300 rtc_device_unregister(info->rtc_dev);
301 kfree(info);
302 }
303 return 0;
304}
305
306#ifdef CONFIG_PM_SLEEP
307static int max8925_rtc_suspend(struct device *dev)
308{
309 struct platform_device *pdev = to_platform_device(dev);
310 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
311
312 if (device_may_wakeup(dev))
313 chip->wakeup_flag |= 1 << MAX8925_IRQ_RTC_ALARM0;
314 return 0;
315}
316static int max8925_rtc_resume(struct device *dev)
317{
318 struct platform_device *pdev = to_platform_device(dev);
319 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
320
321 if (device_may_wakeup(dev))
322 chip->wakeup_flag &= ~(1 << MAX8925_IRQ_RTC_ALARM0);
323 return 0;
324}
325#endif
326
327static SIMPLE_DEV_PM_OPS(max8925_rtc_pm_ops, max8925_rtc_suspend, max8925_rtc_resume);
328
329static struct platform_driver max8925_rtc_driver = {
330 .driver = {
331 .name = "max8925-rtc",
332 .owner = THIS_MODULE,
333 .pm = &max8925_rtc_pm_ops,
334 },
335 .probe = max8925_rtc_probe,
336 .remove = __devexit_p(max8925_rtc_remove),
337};
338
339module_platform_driver(max8925_rtc_driver);
340
341MODULE_DESCRIPTION("Maxim MAX8925 RTC driver");
342MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
343MODULE_LICENSE("GPL");
344
345
