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1/*
2 * DS1286 Real Time Clock interface for Linux
3 *
4 * Copyright (C) 1998, 1999, 2000 Ralf Baechle
5 * Copyright (C) 2008 Thomas Bogendoerfer
6 *
7 * Based on code written by Paul Gortmaker.
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 */
14
15#include <linux/module.h>
16#include <linux/rtc.h>
17#include <linux/platform_device.h>
18#include <linux/bcd.h>
19#include <linux/ds1286.h>
20#include <linux/io.h>
21#include <linux/slab.h>
22
23#define DRV_VERSION "1.0"
24
25struct ds1286_priv {
26 struct rtc_device *rtc;
27 u32 __iomem *rtcregs;
28 spinlock_t lock;
29};
30
31static inline u8 ds1286_rtc_read(struct ds1286_priv *priv, int reg)
32{
33 return __raw_readl(&priv->rtcregs[reg]) & 0xff;
34}
35
36static inline void ds1286_rtc_write(struct ds1286_priv *priv, u8 data, int reg)
37{
38 __raw_writel(data, &priv->rtcregs[reg]);
39}
40
41
42static int ds1286_alarm_irq_enable(struct device *dev, unsigned int enabled)
43{
44 struct ds1286_priv *priv = dev_get_drvdata(dev);
45 unsigned long flags;
46 unsigned char val;
47
48 /* Allow or mask alarm interrupts */
49 spin_lock_irqsave(&priv->lock, flags);
50 val = ds1286_rtc_read(priv, RTC_CMD);
51 if (enabled)
52 val &= ~RTC_TDM;
53 else
54 val |= RTC_TDM;
55 ds1286_rtc_write(priv, val, RTC_CMD);
56 spin_unlock_irqrestore(&priv->lock, flags);
57
58 return 0;
59}
60
61#ifdef CONFIG_RTC_INTF_DEV
62
63static int ds1286_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
64{
65 struct ds1286_priv *priv = dev_get_drvdata(dev);
66 unsigned long flags;
67 unsigned char val;
68
69 switch (cmd) {
70 case RTC_WIE_OFF:
71 /* Mask watchdog int. enab. bit */
72 spin_lock_irqsave(&priv->lock, flags);
73 val = ds1286_rtc_read(priv, RTC_CMD);
74 val |= RTC_WAM;
75 ds1286_rtc_write(priv, val, RTC_CMD);
76 spin_unlock_irqrestore(&priv->lock, flags);
77 break;
78 case RTC_WIE_ON:
79 /* Allow watchdog interrupts. */
80 spin_lock_irqsave(&priv->lock, flags);
81 val = ds1286_rtc_read(priv, RTC_CMD);
82 val &= ~RTC_WAM;
83 ds1286_rtc_write(priv, val, RTC_CMD);
84 spin_unlock_irqrestore(&priv->lock, flags);
85 break;
86 default:
87 return -ENOIOCTLCMD;
88 }
89 return 0;
90}
91
92#else
93#define ds1286_ioctl NULL
94#endif
95
96#ifdef CONFIG_PROC_FS
97
98static int ds1286_proc(struct device *dev, struct seq_file *seq)
99{
100 struct ds1286_priv *priv = dev_get_drvdata(dev);
101 unsigned char month, cmd, amode;
102 const char *s;
103
104 month = ds1286_rtc_read(priv, RTC_MONTH);
105 seq_printf(seq,
106 "oscillator\t: %s\n"
107 "square_wave\t: %s\n",
108 (month & RTC_EOSC) ? "disabled" : "enabled",
109 (month & RTC_ESQW) ? "disabled" : "enabled");
110
111 amode = ((ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x80) >> 5) |
112 ((ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x80) >> 6) |
113 ((ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x80) >> 7);
114 switch (amode) {
115 case 7:
116 s = "each minute";
117 break;
118 case 3:
119 s = "minutes match";
120 break;
121 case 1:
122 s = "hours and minutes match";
123 break;
124 case 0:
125 s = "days, hours and minutes match";
126 break;
127 default:
128 s = "invalid";
129 break;
130 }
131 seq_printf(seq, "alarm_mode\t: %s\n", s);
132
133 cmd = ds1286_rtc_read(priv, RTC_CMD);
134 seq_printf(seq,
135 "alarm_enable\t: %s\n"
136 "wdog_alarm\t: %s\n"
137 "alarm_mask\t: %s\n"
138 "wdog_alarm_mask\t: %s\n"
139 "interrupt_mode\t: %s\n"
140 "INTB_mode\t: %s_active\n"
141 "interrupt_pins\t: %s\n",
142 (cmd & RTC_TDF) ? "yes" : "no",
143 (cmd & RTC_WAF) ? "yes" : "no",
144 (cmd & RTC_TDM) ? "disabled" : "enabled",
145 (cmd & RTC_WAM) ? "disabled" : "enabled",
146 (cmd & RTC_PU_LVL) ? "pulse" : "level",
147 (cmd & RTC_IBH_LO) ? "low" : "high",
148 (cmd & RTC_IPSW) ? "unswapped" : "swapped");
149 return 0;
150}
151
152#else
153#define ds1286_proc NULL
154#endif
155
156static int ds1286_read_time(struct device *dev, struct rtc_time *tm)
157{
158 struct ds1286_priv *priv = dev_get_drvdata(dev);
159 unsigned char save_control;
160 unsigned long flags;
161 unsigned long uip_watchdog = jiffies;
162
163 /*
164 * read RTC once any update in progress is done. The update
165 * can take just over 2ms. We wait 10 to 20ms. There is no need to
166 * to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP.
167 * If you need to know *exactly* when a second has started, enable
168 * periodic update complete interrupts, (via ioctl) and then
169 * immediately read /dev/rtc which will block until you get the IRQ.
170 * Once the read clears, read the RTC time (again via ioctl). Easy.
171 */
172
173 if (ds1286_rtc_read(priv, RTC_CMD) & RTC_TE)
174 while (time_before(jiffies, uip_watchdog + 2*HZ/100))
175 barrier();
176
177 /*
178 * Only the values that we read from the RTC are set. We leave
179 * tm_wday, tm_yday and tm_isdst untouched. Even though the
180 * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
181 * by the RTC when initially set to a non-zero value.
182 */
183 spin_lock_irqsave(&priv->lock, flags);
184 save_control = ds1286_rtc_read(priv, RTC_CMD);
185 ds1286_rtc_write(priv, (save_control|RTC_TE), RTC_CMD);
186
187 tm->tm_sec = ds1286_rtc_read(priv, RTC_SECONDS);
188 tm->tm_min = ds1286_rtc_read(priv, RTC_MINUTES);
189 tm->tm_hour = ds1286_rtc_read(priv, RTC_HOURS) & 0x3f;
190 tm->tm_mday = ds1286_rtc_read(priv, RTC_DATE);
191 tm->tm_mon = ds1286_rtc_read(priv, RTC_MONTH) & 0x1f;
192 tm->tm_year = ds1286_rtc_read(priv, RTC_YEAR);
193
194 ds1286_rtc_write(priv, save_control, RTC_CMD);
195 spin_unlock_irqrestore(&priv->lock, flags);
196
197 tm->tm_sec = bcd2bin(tm->tm_sec);
198 tm->tm_min = bcd2bin(tm->tm_min);
199 tm->tm_hour = bcd2bin(tm->tm_hour);
200 tm->tm_mday = bcd2bin(tm->tm_mday);
201 tm->tm_mon = bcd2bin(tm->tm_mon);
202 tm->tm_year = bcd2bin(tm->tm_year);
203
204 /*
205 * Account for differences between how the RTC uses the values
206 * and how they are defined in a struct rtc_time;
207 */
208 if (tm->tm_year < 45)
209 tm->tm_year += 30;
210 tm->tm_year += 40;
211 if (tm->tm_year < 70)
212 tm->tm_year += 100;
213
214 tm->tm_mon--;
215
216 return rtc_valid_tm(tm);
217}
218
219static int ds1286_set_time(struct device *dev, struct rtc_time *tm)
220{
221 struct ds1286_priv *priv = dev_get_drvdata(dev);
222 unsigned char mon, day, hrs, min, sec;
223 unsigned char save_control;
224 unsigned int yrs;
225 unsigned long flags;
226
227 yrs = tm->tm_year + 1900;
228 mon = tm->tm_mon + 1; /* tm_mon starts at zero */
229 day = tm->tm_mday;
230 hrs = tm->tm_hour;
231 min = tm->tm_min;
232 sec = tm->tm_sec;
233
234 if (yrs < 1970)
235 return -EINVAL;
236
237 yrs -= 1940;
238 if (yrs > 255) /* They are unsigned */
239 return -EINVAL;
240
241 if (yrs >= 100)
242 yrs -= 100;
243
244 sec = bin2bcd(sec);
245 min = bin2bcd(min);
246 hrs = bin2bcd(hrs);
247 day = bin2bcd(day);
248 mon = bin2bcd(mon);
249 yrs = bin2bcd(yrs);
250
251 spin_lock_irqsave(&priv->lock, flags);
252 save_control = ds1286_rtc_read(priv, RTC_CMD);
253 ds1286_rtc_write(priv, (save_control|RTC_TE), RTC_CMD);
254
255 ds1286_rtc_write(priv, yrs, RTC_YEAR);
256 ds1286_rtc_write(priv, mon, RTC_MONTH);
257 ds1286_rtc_write(priv, day, RTC_DATE);
258 ds1286_rtc_write(priv, hrs, RTC_HOURS);
259 ds1286_rtc_write(priv, min, RTC_MINUTES);
260 ds1286_rtc_write(priv, sec, RTC_SECONDS);
261 ds1286_rtc_write(priv, 0, RTC_HUNDREDTH_SECOND);
262
263 ds1286_rtc_write(priv, save_control, RTC_CMD);
264 spin_unlock_irqrestore(&priv->lock, flags);
265 return 0;
266}
267
268static int ds1286_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
269{
270 struct ds1286_priv *priv = dev_get_drvdata(dev);
271 unsigned long flags;
272
273 /*
274 * Only the values that we read from the RTC are set. That
275 * means only tm_wday, tm_hour, tm_min.
276 */
277 spin_lock_irqsave(&priv->lock, flags);
278 alm->time.tm_min = ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x7f;
279 alm->time.tm_hour = ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x1f;
280 alm->time.tm_wday = ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x07;
281 ds1286_rtc_read(priv, RTC_CMD);
282 spin_unlock_irqrestore(&priv->lock, flags);
283
284 alm->time.tm_min = bcd2bin(alm->time.tm_min);
285 alm->time.tm_hour = bcd2bin(alm->time.tm_hour);
286 alm->time.tm_sec = 0;
287 return 0;
288}
289
290static int ds1286_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
291{
292 struct ds1286_priv *priv = dev_get_drvdata(dev);
293 unsigned char hrs, min, sec;
294
295 hrs = alm->time.tm_hour;
296 min = alm->time.tm_min;
297 sec = alm->time.tm_sec;
298
299 if (hrs >= 24)
300 hrs = 0xff;
301
302 if (min >= 60)
303 min = 0xff;
304
305 if (sec != 0)
306 return -EINVAL;
307
308 min = bin2bcd(min);
309 hrs = bin2bcd(hrs);
310
311 spin_lock(&priv->lock);
312 ds1286_rtc_write(priv, hrs, RTC_HOURS_ALARM);
313 ds1286_rtc_write(priv, min, RTC_MINUTES_ALARM);
314 spin_unlock(&priv->lock);
315
316 return 0;
317}
318
319static const struct rtc_class_ops ds1286_ops = {
320 .ioctl = ds1286_ioctl,
321 .proc = ds1286_proc,
322 .read_time = ds1286_read_time,
323 .set_time = ds1286_set_time,
324 .read_alarm = ds1286_read_alarm,
325 .set_alarm = ds1286_set_alarm,
326 .alarm_irq_enable = ds1286_alarm_irq_enable,
327};
328
329static int ds1286_probe(struct platform_device *pdev)
330{
331 struct rtc_device *rtc;
332 struct resource *res;
333 struct ds1286_priv *priv;
334
335 priv = devm_kzalloc(&pdev->dev, sizeof(struct ds1286_priv), GFP_KERNEL);
336 if (!priv)
337 return -ENOMEM;
338
339 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
340 priv->rtcregs = devm_ioremap_resource(&pdev->dev, res);
341 if (IS_ERR(priv->rtcregs))
342 return PTR_ERR(priv->rtcregs);
343
344 spin_lock_init(&priv->lock);
345 platform_set_drvdata(pdev, priv);
346 rtc = devm_rtc_device_register(&pdev->dev, "ds1286", &ds1286_ops,
347 THIS_MODULE);
348 if (IS_ERR(rtc))
349 return PTR_ERR(rtc);
350 priv->rtc = rtc;
351 return 0;
352}
353
354static struct platform_driver ds1286_platform_driver = {
355 .driver = {
356 .name = "rtc-ds1286",
357 },
358 .probe = ds1286_probe,
359};
360
361module_platform_driver(ds1286_platform_driver);
362
363MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>");
364MODULE_DESCRIPTION("DS1286 RTC driver");
365MODULE_LICENSE("GPL");
366MODULE_VERSION(DRV_VERSION);
367MODULE_ALIAS("platform:rtc-ds1286");
1/*
2 * DS1286 Real Time Clock interface for Linux
3 *
4 * Copyright (C) 1998, 1999, 2000 Ralf Baechle
5 * Copyright (C) 2008 Thomas Bogendoerfer
6 *
7 * Based on code written by Paul Gortmaker.
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 */
14
15#include <linux/module.h>
16#include <linux/rtc.h>
17#include <linux/platform_device.h>
18#include <linux/bcd.h>
19#include <linux/rtc/ds1286.h>
20#include <linux/io.h>
21#include <linux/slab.h>
22
23struct ds1286_priv {
24 struct rtc_device *rtc;
25 u32 __iomem *rtcregs;
26 spinlock_t lock;
27};
28
29static inline u8 ds1286_rtc_read(struct ds1286_priv *priv, int reg)
30{
31 return __raw_readl(&priv->rtcregs[reg]) & 0xff;
32}
33
34static inline void ds1286_rtc_write(struct ds1286_priv *priv, u8 data, int reg)
35{
36 __raw_writel(data, &priv->rtcregs[reg]);
37}
38
39
40static int ds1286_alarm_irq_enable(struct device *dev, unsigned int enabled)
41{
42 struct ds1286_priv *priv = dev_get_drvdata(dev);
43 unsigned long flags;
44 unsigned char val;
45
46 /* Allow or mask alarm interrupts */
47 spin_lock_irqsave(&priv->lock, flags);
48 val = ds1286_rtc_read(priv, RTC_CMD);
49 if (enabled)
50 val &= ~RTC_TDM;
51 else
52 val |= RTC_TDM;
53 ds1286_rtc_write(priv, val, RTC_CMD);
54 spin_unlock_irqrestore(&priv->lock, flags);
55
56 return 0;
57}
58
59#ifdef CONFIG_RTC_INTF_DEV
60
61static int ds1286_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
62{
63 struct ds1286_priv *priv = dev_get_drvdata(dev);
64 unsigned long flags;
65 unsigned char val;
66
67 switch (cmd) {
68 case RTC_WIE_OFF:
69 /* Mask watchdog int. enab. bit */
70 spin_lock_irqsave(&priv->lock, flags);
71 val = ds1286_rtc_read(priv, RTC_CMD);
72 val |= RTC_WAM;
73 ds1286_rtc_write(priv, val, RTC_CMD);
74 spin_unlock_irqrestore(&priv->lock, flags);
75 break;
76 case RTC_WIE_ON:
77 /* Allow watchdog interrupts. */
78 spin_lock_irqsave(&priv->lock, flags);
79 val = ds1286_rtc_read(priv, RTC_CMD);
80 val &= ~RTC_WAM;
81 ds1286_rtc_write(priv, val, RTC_CMD);
82 spin_unlock_irqrestore(&priv->lock, flags);
83 break;
84 default:
85 return -ENOIOCTLCMD;
86 }
87 return 0;
88}
89
90#else
91#define ds1286_ioctl NULL
92#endif
93
94#ifdef CONFIG_PROC_FS
95
96static int ds1286_proc(struct device *dev, struct seq_file *seq)
97{
98 struct ds1286_priv *priv = dev_get_drvdata(dev);
99 unsigned char month, cmd, amode;
100 const char *s;
101
102 month = ds1286_rtc_read(priv, RTC_MONTH);
103 seq_printf(seq,
104 "oscillator\t: %s\n"
105 "square_wave\t: %s\n",
106 (month & RTC_EOSC) ? "disabled" : "enabled",
107 (month & RTC_ESQW) ? "disabled" : "enabled");
108
109 amode = ((ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x80) >> 5) |
110 ((ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x80) >> 6) |
111 ((ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x80) >> 7);
112 switch (amode) {
113 case 7:
114 s = "each minute";
115 break;
116 case 3:
117 s = "minutes match";
118 break;
119 case 1:
120 s = "hours and minutes match";
121 break;
122 case 0:
123 s = "days, hours and minutes match";
124 break;
125 default:
126 s = "invalid";
127 break;
128 }
129 seq_printf(seq, "alarm_mode\t: %s\n", s);
130
131 cmd = ds1286_rtc_read(priv, RTC_CMD);
132 seq_printf(seq,
133 "alarm_enable\t: %s\n"
134 "wdog_alarm\t: %s\n"
135 "alarm_mask\t: %s\n"
136 "wdog_alarm_mask\t: %s\n"
137 "interrupt_mode\t: %s\n"
138 "INTB_mode\t: %s_active\n"
139 "interrupt_pins\t: %s\n",
140 (cmd & RTC_TDF) ? "yes" : "no",
141 (cmd & RTC_WAF) ? "yes" : "no",
142 (cmd & RTC_TDM) ? "disabled" : "enabled",
143 (cmd & RTC_WAM) ? "disabled" : "enabled",
144 (cmd & RTC_PU_LVL) ? "pulse" : "level",
145 (cmd & RTC_IBH_LO) ? "low" : "high",
146 (cmd & RTC_IPSW) ? "unswapped" : "swapped");
147 return 0;
148}
149
150#else
151#define ds1286_proc NULL
152#endif
153
154static int ds1286_read_time(struct device *dev, struct rtc_time *tm)
155{
156 struct ds1286_priv *priv = dev_get_drvdata(dev);
157 unsigned char save_control;
158 unsigned long flags;
159 unsigned long uip_watchdog = jiffies;
160
161 /*
162 * read RTC once any update in progress is done. The update
163 * can take just over 2ms. We wait 10 to 20ms. There is no need to
164 * to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP.
165 * If you need to know *exactly* when a second has started, enable
166 * periodic update complete interrupts, (via ioctl) and then
167 * immediately read /dev/rtc which will block until you get the IRQ.
168 * Once the read clears, read the RTC time (again via ioctl). Easy.
169 */
170
171 if (ds1286_rtc_read(priv, RTC_CMD) & RTC_TE)
172 while (time_before(jiffies, uip_watchdog + 2*HZ/100))
173 barrier();
174
175 /*
176 * Only the values that we read from the RTC are set. We leave
177 * tm_wday, tm_yday and tm_isdst untouched. Even though the
178 * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
179 * by the RTC when initially set to a non-zero value.
180 */
181 spin_lock_irqsave(&priv->lock, flags);
182 save_control = ds1286_rtc_read(priv, RTC_CMD);
183 ds1286_rtc_write(priv, (save_control|RTC_TE), RTC_CMD);
184
185 tm->tm_sec = ds1286_rtc_read(priv, RTC_SECONDS);
186 tm->tm_min = ds1286_rtc_read(priv, RTC_MINUTES);
187 tm->tm_hour = ds1286_rtc_read(priv, RTC_HOURS) & 0x3f;
188 tm->tm_mday = ds1286_rtc_read(priv, RTC_DATE);
189 tm->tm_mon = ds1286_rtc_read(priv, RTC_MONTH) & 0x1f;
190 tm->tm_year = ds1286_rtc_read(priv, RTC_YEAR);
191
192 ds1286_rtc_write(priv, save_control, RTC_CMD);
193 spin_unlock_irqrestore(&priv->lock, flags);
194
195 tm->tm_sec = bcd2bin(tm->tm_sec);
196 tm->tm_min = bcd2bin(tm->tm_min);
197 tm->tm_hour = bcd2bin(tm->tm_hour);
198 tm->tm_mday = bcd2bin(tm->tm_mday);
199 tm->tm_mon = bcd2bin(tm->tm_mon);
200 tm->tm_year = bcd2bin(tm->tm_year);
201
202 /*
203 * Account for differences between how the RTC uses the values
204 * and how they are defined in a struct rtc_time;
205 */
206 if (tm->tm_year < 45)
207 tm->tm_year += 30;
208 tm->tm_year += 40;
209 if (tm->tm_year < 70)
210 tm->tm_year += 100;
211
212 tm->tm_mon--;
213
214 return 0;
215}
216
217static int ds1286_set_time(struct device *dev, struct rtc_time *tm)
218{
219 struct ds1286_priv *priv = dev_get_drvdata(dev);
220 unsigned char mon, day, hrs, min, sec;
221 unsigned char save_control;
222 unsigned int yrs;
223 unsigned long flags;
224
225 yrs = tm->tm_year + 1900;
226 mon = tm->tm_mon + 1; /* tm_mon starts at zero */
227 day = tm->tm_mday;
228 hrs = tm->tm_hour;
229 min = tm->tm_min;
230 sec = tm->tm_sec;
231
232 if (yrs < 1970)
233 return -EINVAL;
234
235 yrs -= 1940;
236 if (yrs > 255) /* They are unsigned */
237 return -EINVAL;
238
239 if (yrs >= 100)
240 yrs -= 100;
241
242 sec = bin2bcd(sec);
243 min = bin2bcd(min);
244 hrs = bin2bcd(hrs);
245 day = bin2bcd(day);
246 mon = bin2bcd(mon);
247 yrs = bin2bcd(yrs);
248
249 spin_lock_irqsave(&priv->lock, flags);
250 save_control = ds1286_rtc_read(priv, RTC_CMD);
251 ds1286_rtc_write(priv, (save_control|RTC_TE), RTC_CMD);
252
253 ds1286_rtc_write(priv, yrs, RTC_YEAR);
254 ds1286_rtc_write(priv, mon, RTC_MONTH);
255 ds1286_rtc_write(priv, day, RTC_DATE);
256 ds1286_rtc_write(priv, hrs, RTC_HOURS);
257 ds1286_rtc_write(priv, min, RTC_MINUTES);
258 ds1286_rtc_write(priv, sec, RTC_SECONDS);
259 ds1286_rtc_write(priv, 0, RTC_HUNDREDTH_SECOND);
260
261 ds1286_rtc_write(priv, save_control, RTC_CMD);
262 spin_unlock_irqrestore(&priv->lock, flags);
263 return 0;
264}
265
266static int ds1286_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
267{
268 struct ds1286_priv *priv = dev_get_drvdata(dev);
269 unsigned long flags;
270
271 /*
272 * Only the values that we read from the RTC are set. That
273 * means only tm_wday, tm_hour, tm_min.
274 */
275 spin_lock_irqsave(&priv->lock, flags);
276 alm->time.tm_min = ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x7f;
277 alm->time.tm_hour = ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x1f;
278 alm->time.tm_wday = ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x07;
279 ds1286_rtc_read(priv, RTC_CMD);
280 spin_unlock_irqrestore(&priv->lock, flags);
281
282 alm->time.tm_min = bcd2bin(alm->time.tm_min);
283 alm->time.tm_hour = bcd2bin(alm->time.tm_hour);
284 alm->time.tm_sec = 0;
285 return 0;
286}
287
288static int ds1286_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
289{
290 struct ds1286_priv *priv = dev_get_drvdata(dev);
291 unsigned char hrs, min, sec;
292
293 hrs = alm->time.tm_hour;
294 min = alm->time.tm_min;
295 sec = alm->time.tm_sec;
296
297 if (hrs >= 24)
298 hrs = 0xff;
299
300 if (min >= 60)
301 min = 0xff;
302
303 if (sec != 0)
304 return -EINVAL;
305
306 min = bin2bcd(min);
307 hrs = bin2bcd(hrs);
308
309 spin_lock(&priv->lock);
310 ds1286_rtc_write(priv, hrs, RTC_HOURS_ALARM);
311 ds1286_rtc_write(priv, min, RTC_MINUTES_ALARM);
312 spin_unlock(&priv->lock);
313
314 return 0;
315}
316
317static const struct rtc_class_ops ds1286_ops = {
318 .ioctl = ds1286_ioctl,
319 .proc = ds1286_proc,
320 .read_time = ds1286_read_time,
321 .set_time = ds1286_set_time,
322 .read_alarm = ds1286_read_alarm,
323 .set_alarm = ds1286_set_alarm,
324 .alarm_irq_enable = ds1286_alarm_irq_enable,
325};
326
327static int ds1286_probe(struct platform_device *pdev)
328{
329 struct rtc_device *rtc;
330 struct resource *res;
331 struct ds1286_priv *priv;
332
333 priv = devm_kzalloc(&pdev->dev, sizeof(struct ds1286_priv), GFP_KERNEL);
334 if (!priv)
335 return -ENOMEM;
336
337 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
338 priv->rtcregs = devm_ioremap_resource(&pdev->dev, res);
339 if (IS_ERR(priv->rtcregs))
340 return PTR_ERR(priv->rtcregs);
341
342 spin_lock_init(&priv->lock);
343 platform_set_drvdata(pdev, priv);
344 rtc = devm_rtc_device_register(&pdev->dev, "ds1286", &ds1286_ops,
345 THIS_MODULE);
346 if (IS_ERR(rtc))
347 return PTR_ERR(rtc);
348 priv->rtc = rtc;
349 return 0;
350}
351
352static struct platform_driver ds1286_platform_driver = {
353 .driver = {
354 .name = "rtc-ds1286",
355 },
356 .probe = ds1286_probe,
357};
358
359module_platform_driver(ds1286_platform_driver);
360
361MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>");
362MODULE_DESCRIPTION("DS1286 RTC driver");
363MODULE_LICENSE("GPL");
364MODULE_ALIAS("platform:rtc-ds1286");