blob: be8359fdb65a2c168cab426a73723e4591c60bd7 [file] [log] [blame]
Mark Zhan2e774c72007-07-17 04:05:05 -07001/*
2 * ST M48T59 RTC driver
3 *
4 * Copyright (c) 2007 Wind River Systems, Inc.
5 *
6 * Author: Mark Zhan <rongkai.zhan@windriver.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/io.h>
17#include <linux/device.h>
18#include <linux/platform_device.h>
19#include <linux/rtc.h>
20#include <linux/rtc/m48t59.h>
21#include <linux/bcd.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Mark Zhan2e774c72007-07-17 04:05:05 -070023
24#ifndef NO_IRQ
25#define NO_IRQ (-1)
26#endif
27
Krzysztof Helt94fe7422008-09-03 15:12:34 -070028#define M48T59_READ(reg) (pdata->read_byte(dev, pdata->offset + reg))
29#define M48T59_WRITE(val, reg) \
30 (pdata->write_byte(dev, pdata->offset + reg, val))
Mark Zhan2e774c72007-07-17 04:05:05 -070031
32#define M48T59_SET_BITS(mask, reg) \
33 M48T59_WRITE((M48T59_READ(reg) | (mask)), (reg))
34#define M48T59_CLEAR_BITS(mask, reg) \
35 M48T59_WRITE((M48T59_READ(reg) & ~(mask)), (reg))
36
37struct m48t59_private {
38 void __iomem *ioaddr;
Mark Zhan04392082007-07-31 00:39:47 -070039 int irq;
Mark Zhan2e774c72007-07-17 04:05:05 -070040 struct rtc_device *rtc;
41 spinlock_t lock; /* serialize the NVRAM and RTC access */
42};
43
44/*
45 * This is the generic access method when the chip is memory-mapped
46 */
47static void
48m48t59_mem_writeb(struct device *dev, u32 ofs, u8 val)
49{
50 struct platform_device *pdev = to_platform_device(dev);
51 struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
52
53 writeb(val, m48t59->ioaddr+ofs);
54}
55
56static u8
57m48t59_mem_readb(struct device *dev, u32 ofs)
58{
59 struct platform_device *pdev = to_platform_device(dev);
60 struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
61
62 return readb(m48t59->ioaddr+ofs);
63}
64
65/*
66 * NOTE: M48T59 only uses BCD mode
67 */
68static int m48t59_rtc_read_time(struct device *dev, struct rtc_time *tm)
69{
70 struct platform_device *pdev = to_platform_device(dev);
71 struct m48t59_plat_data *pdata = pdev->dev.platform_data;
72 struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
73 unsigned long flags;
74 u8 val;
75
76 spin_lock_irqsave(&m48t59->lock, flags);
77 /* Issue the READ command */
78 M48T59_SET_BITS(M48T59_CNTL_READ, M48T59_CNTL);
79
Adrian Bunkfe20ba72008-10-18 20:28:41 -070080 tm->tm_year = bcd2bin(M48T59_READ(M48T59_YEAR));
Mark Zhan2e774c72007-07-17 04:05:05 -070081 /* tm_mon is 0-11 */
Adrian Bunkfe20ba72008-10-18 20:28:41 -070082 tm->tm_mon = bcd2bin(M48T59_READ(M48T59_MONTH)) - 1;
83 tm->tm_mday = bcd2bin(M48T59_READ(M48T59_MDAY));
Mark Zhan2e774c72007-07-17 04:05:05 -070084
85 val = M48T59_READ(M48T59_WDAY);
Robert Reif833be4e2008-09-09 19:38:17 -070086 if ((pdata->type == M48T59RTC_TYPE_M48T59) &&
87 (val & M48T59_WDAY_CEB) && (val & M48T59_WDAY_CB)) {
Mark Zhan2e774c72007-07-17 04:05:05 -070088 dev_dbg(dev, "Century bit is enabled\n");
89 tm->tm_year += 100; /* one century */
90 }
Krzysztof Helt12a9ee32008-10-29 15:35:24 -070091#ifdef CONFIG_SPARC
92 /* Sun SPARC machines count years since 1968 */
93 tm->tm_year += 68;
94#endif
Mark Zhan2e774c72007-07-17 04:05:05 -070095
Adrian Bunkfe20ba72008-10-18 20:28:41 -070096 tm->tm_wday = bcd2bin(val & 0x07);
97 tm->tm_hour = bcd2bin(M48T59_READ(M48T59_HOUR) & 0x3F);
98 tm->tm_min = bcd2bin(M48T59_READ(M48T59_MIN) & 0x7F);
99 tm->tm_sec = bcd2bin(M48T59_READ(M48T59_SEC) & 0x7F);
Mark Zhan2e774c72007-07-17 04:05:05 -0700100
101 /* Clear the READ bit */
102 M48T59_CLEAR_BITS(M48T59_CNTL_READ, M48T59_CNTL);
103 spin_unlock_irqrestore(&m48t59->lock, flags);
104
105 dev_dbg(dev, "RTC read time %04d-%02d-%02d %02d/%02d/%02d\n",
106 tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
107 tm->tm_hour, tm->tm_min, tm->tm_sec);
108 return 0;
109}
110
111static int m48t59_rtc_set_time(struct device *dev, struct rtc_time *tm)
112{
113 struct platform_device *pdev = to_platform_device(dev);
114 struct m48t59_plat_data *pdata = pdev->dev.platform_data;
115 struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
116 unsigned long flags;
117 u8 val = 0;
Krzysztof Helt12a9ee32008-10-29 15:35:24 -0700118 int year = tm->tm_year;
119
120#ifdef CONFIG_SPARC
121 /* Sun SPARC machines count years since 1968 */
122 year -= 68;
123#endif
Mark Zhan2e774c72007-07-17 04:05:05 -0700124
125 dev_dbg(dev, "RTC set time %04d-%02d-%02d %02d/%02d/%02d\n",
Krzysztof Helt12a9ee32008-10-29 15:35:24 -0700126 year + 1900, tm->tm_mon, tm->tm_mday,
Mark Zhan2e774c72007-07-17 04:05:05 -0700127 tm->tm_hour, tm->tm_min, tm->tm_sec);
128
Krzysztof Helt12a9ee32008-10-29 15:35:24 -0700129 if (year < 0)
130 return -EINVAL;
131
Mark Zhan2e774c72007-07-17 04:05:05 -0700132 spin_lock_irqsave(&m48t59->lock, flags);
133 /* Issue the WRITE command */
134 M48T59_SET_BITS(M48T59_CNTL_WRITE, M48T59_CNTL);
135
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700136 M48T59_WRITE((bin2bcd(tm->tm_sec) & 0x7F), M48T59_SEC);
137 M48T59_WRITE((bin2bcd(tm->tm_min) & 0x7F), M48T59_MIN);
138 M48T59_WRITE((bin2bcd(tm->tm_hour) & 0x3F), M48T59_HOUR);
139 M48T59_WRITE((bin2bcd(tm->tm_mday) & 0x3F), M48T59_MDAY);
Mark Zhan2e774c72007-07-17 04:05:05 -0700140 /* tm_mon is 0-11 */
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700141 M48T59_WRITE((bin2bcd(tm->tm_mon + 1) & 0x1F), M48T59_MONTH);
Krzysztof Helt12a9ee32008-10-29 15:35:24 -0700142 M48T59_WRITE(bin2bcd(year % 100), M48T59_YEAR);
Mark Zhan2e774c72007-07-17 04:05:05 -0700143
Krzysztof Helt12a9ee32008-10-29 15:35:24 -0700144 if (pdata->type == M48T59RTC_TYPE_M48T59 && (year / 100))
Mark Zhan2e774c72007-07-17 04:05:05 -0700145 val = (M48T59_WDAY_CEB | M48T59_WDAY_CB);
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700146 val |= (bin2bcd(tm->tm_wday) & 0x07);
Mark Zhan2e774c72007-07-17 04:05:05 -0700147 M48T59_WRITE(val, M48T59_WDAY);
148
149 /* Clear the WRITE bit */
150 M48T59_CLEAR_BITS(M48T59_CNTL_WRITE, M48T59_CNTL);
151 spin_unlock_irqrestore(&m48t59->lock, flags);
152 return 0;
153}
154
155/*
156 * Read alarm time and date in RTC
157 */
158static int m48t59_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
159{
160 struct platform_device *pdev = to_platform_device(dev);
161 struct m48t59_plat_data *pdata = pdev->dev.platform_data;
162 struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
163 struct rtc_time *tm = &alrm->time;
164 unsigned long flags;
165 u8 val;
166
167 /* If no irq, we don't support ALARM */
168 if (m48t59->irq == NO_IRQ)
169 return -EIO;
170
171 spin_lock_irqsave(&m48t59->lock, flags);
172 /* Issue the READ command */
173 M48T59_SET_BITS(M48T59_CNTL_READ, M48T59_CNTL);
174
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700175 tm->tm_year = bcd2bin(M48T59_READ(M48T59_YEAR));
Krzysztof Helt12a9ee32008-10-29 15:35:24 -0700176#ifdef CONFIG_SPARC
177 /* Sun SPARC machines count years since 1968 */
178 tm->tm_year += 68;
179#endif
Mark Zhan2e774c72007-07-17 04:05:05 -0700180 /* tm_mon is 0-11 */
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700181 tm->tm_mon = bcd2bin(M48T59_READ(M48T59_MONTH)) - 1;
Mark Zhan2e774c72007-07-17 04:05:05 -0700182
183 val = M48T59_READ(M48T59_WDAY);
184 if ((val & M48T59_WDAY_CEB) && (val & M48T59_WDAY_CB))
185 tm->tm_year += 100; /* one century */
186
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700187 tm->tm_mday = bcd2bin(M48T59_READ(M48T59_ALARM_DATE));
188 tm->tm_hour = bcd2bin(M48T59_READ(M48T59_ALARM_HOUR));
189 tm->tm_min = bcd2bin(M48T59_READ(M48T59_ALARM_MIN));
190 tm->tm_sec = bcd2bin(M48T59_READ(M48T59_ALARM_SEC));
Mark Zhan2e774c72007-07-17 04:05:05 -0700191
192 /* Clear the READ bit */
193 M48T59_CLEAR_BITS(M48T59_CNTL_READ, M48T59_CNTL);
194 spin_unlock_irqrestore(&m48t59->lock, flags);
195
196 dev_dbg(dev, "RTC read alarm time %04d-%02d-%02d %02d/%02d/%02d\n",
197 tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
198 tm->tm_hour, tm->tm_min, tm->tm_sec);
199 return 0;
200}
201
202/*
203 * Set alarm time and date in RTC
204 */
205static int m48t59_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
206{
207 struct platform_device *pdev = to_platform_device(dev);
208 struct m48t59_plat_data *pdata = pdev->dev.platform_data;
209 struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
210 struct rtc_time *tm = &alrm->time;
211 u8 mday, hour, min, sec;
212 unsigned long flags;
Krzysztof Helt12a9ee32008-10-29 15:35:24 -0700213 int year = tm->tm_year;
214
215#ifdef CONFIG_SPARC
216 /* Sun SPARC machines count years since 1968 */
217 year -= 68;
218#endif
Mark Zhan2e774c72007-07-17 04:05:05 -0700219
220 /* If no irq, we don't support ALARM */
221 if (m48t59->irq == NO_IRQ)
222 return -EIO;
223
Krzysztof Helt12a9ee32008-10-29 15:35:24 -0700224 if (year < 0)
225 return -EINVAL;
226
Mark Zhan2e774c72007-07-17 04:05:05 -0700227 /*
228 * 0xff means "always match"
229 */
230 mday = tm->tm_mday;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700231 mday = (mday >= 1 && mday <= 31) ? bin2bcd(mday) : 0xff;
Mark Zhan2e774c72007-07-17 04:05:05 -0700232 if (mday == 0xff)
233 mday = M48T59_READ(M48T59_MDAY);
234
235 hour = tm->tm_hour;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700236 hour = (hour < 24) ? bin2bcd(hour) : 0x00;
Mark Zhan2e774c72007-07-17 04:05:05 -0700237
238 min = tm->tm_min;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700239 min = (min < 60) ? bin2bcd(min) : 0x00;
Mark Zhan2e774c72007-07-17 04:05:05 -0700240
241 sec = tm->tm_sec;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700242 sec = (sec < 60) ? bin2bcd(sec) : 0x00;
Mark Zhan2e774c72007-07-17 04:05:05 -0700243
244 spin_lock_irqsave(&m48t59->lock, flags);
245 /* Issue the WRITE command */
246 M48T59_SET_BITS(M48T59_CNTL_WRITE, M48T59_CNTL);
247
248 M48T59_WRITE(mday, M48T59_ALARM_DATE);
249 M48T59_WRITE(hour, M48T59_ALARM_HOUR);
250 M48T59_WRITE(min, M48T59_ALARM_MIN);
251 M48T59_WRITE(sec, M48T59_ALARM_SEC);
252
253 /* Clear the WRITE bit */
254 M48T59_CLEAR_BITS(M48T59_CNTL_WRITE, M48T59_CNTL);
255 spin_unlock_irqrestore(&m48t59->lock, flags);
256
257 dev_dbg(dev, "RTC set alarm time %04d-%02d-%02d %02d/%02d/%02d\n",
Krzysztof Helt12a9ee32008-10-29 15:35:24 -0700258 year + 1900, tm->tm_mon, tm->tm_mday,
Mark Zhan2e774c72007-07-17 04:05:05 -0700259 tm->tm_hour, tm->tm_min, tm->tm_sec);
260 return 0;
261}
262
263/*
264 * Handle commands from user-space
265 */
266static int m48t59_rtc_ioctl(struct device *dev, unsigned int cmd,
267 unsigned long arg)
268{
269 struct platform_device *pdev = to_platform_device(dev);
270 struct m48t59_plat_data *pdata = pdev->dev.platform_data;
271 struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
272 unsigned long flags;
273 int ret = 0;
274
275 spin_lock_irqsave(&m48t59->lock, flags);
276 switch (cmd) {
277 case RTC_AIE_OFF: /* alarm interrupt off */
278 M48T59_WRITE(0x00, M48T59_INTR);
279 break;
280 case RTC_AIE_ON: /* alarm interrupt on */
281 M48T59_WRITE(M48T59_INTR_AFE, M48T59_INTR);
282 break;
283 default:
284 ret = -ENOIOCTLCMD;
285 break;
286 }
287 spin_unlock_irqrestore(&m48t59->lock, flags);
288
289 return ret;
290}
291
292static int m48t59_rtc_proc(struct device *dev, struct seq_file *seq)
293{
294 struct platform_device *pdev = to_platform_device(dev);
295 struct m48t59_plat_data *pdata = pdev->dev.platform_data;
296 struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
297 unsigned long flags;
298 u8 val;
299
300 spin_lock_irqsave(&m48t59->lock, flags);
301 val = M48T59_READ(M48T59_FLAGS);
302 spin_unlock_irqrestore(&m48t59->lock, flags);
303
304 seq_printf(seq, "battery\t\t: %s\n",
305 (val & M48T59_FLAGS_BF) ? "low" : "normal");
306 return 0;
307}
308
309/*
310 * IRQ handler for the RTC
311 */
312static irqreturn_t m48t59_rtc_interrupt(int irq, void *dev_id)
313{
314 struct device *dev = (struct device *)dev_id;
315 struct platform_device *pdev = to_platform_device(dev);
316 struct m48t59_plat_data *pdata = pdev->dev.platform_data;
317 struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
318 u8 event;
319
320 spin_lock(&m48t59->lock);
321 event = M48T59_READ(M48T59_FLAGS);
322 spin_unlock(&m48t59->lock);
323
324 if (event & M48T59_FLAGS_AF) {
325 rtc_update_irq(m48t59->rtc, 1, (RTC_AF | RTC_IRQF));
326 return IRQ_HANDLED;
327 }
328
329 return IRQ_NONE;
330}
331
332static const struct rtc_class_ops m48t59_rtc_ops = {
333 .ioctl = m48t59_rtc_ioctl,
334 .read_time = m48t59_rtc_read_time,
335 .set_time = m48t59_rtc_set_time,
336 .read_alarm = m48t59_rtc_readalarm,
337 .set_alarm = m48t59_rtc_setalarm,
338 .proc = m48t59_rtc_proc,
339};
340
Krzysztof Helt94fe7422008-09-03 15:12:34 -0700341static const struct rtc_class_ops m48t02_rtc_ops = {
342 .read_time = m48t59_rtc_read_time,
343 .set_time = m48t59_rtc_set_time,
344};
345
Chris Wright2c3c8be2010-05-12 18:28:57 -0700346static ssize_t m48t59_nvram_read(struct file *filp, struct kobject *kobj,
Mark Zhan2e774c72007-07-17 04:05:05 -0700347 struct bin_attribute *bin_attr,
348 char *buf, loff_t pos, size_t size)
349{
350 struct device *dev = container_of(kobj, struct device, kobj);
351 struct platform_device *pdev = to_platform_device(dev);
352 struct m48t59_plat_data *pdata = pdev->dev.platform_data;
353 struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
354 ssize_t cnt = 0;
355 unsigned long flags;
356
Krzysztof Helt94fe7422008-09-03 15:12:34 -0700357 for (; size > 0 && pos < pdata->offset; cnt++, size--) {
Mark Zhan2e774c72007-07-17 04:05:05 -0700358 spin_lock_irqsave(&m48t59->lock, flags);
359 *buf++ = M48T59_READ(cnt);
360 spin_unlock_irqrestore(&m48t59->lock, flags);
361 }
362
363 return cnt;
364}
365
Chris Wright2c3c8be2010-05-12 18:28:57 -0700366static ssize_t m48t59_nvram_write(struct file *filp, struct kobject *kobj,
Mark Zhan2e774c72007-07-17 04:05:05 -0700367 struct bin_attribute *bin_attr,
368 char *buf, loff_t pos, size_t size)
369{
370 struct device *dev = container_of(kobj, struct device, kobj);
371 struct platform_device *pdev = to_platform_device(dev);
372 struct m48t59_plat_data *pdata = pdev->dev.platform_data;
373 struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
374 ssize_t cnt = 0;
375 unsigned long flags;
376
Krzysztof Helt94fe7422008-09-03 15:12:34 -0700377 for (; size > 0 && pos < pdata->offset; cnt++, size--) {
Mark Zhan2e774c72007-07-17 04:05:05 -0700378 spin_lock_irqsave(&m48t59->lock, flags);
379 M48T59_WRITE(*buf++, cnt);
380 spin_unlock_irqrestore(&m48t59->lock, flags);
381 }
382
383 return cnt;
384}
385
386static struct bin_attribute m48t59_nvram_attr = {
387 .attr = {
388 .name = "nvram",
David Brownella4b1d502007-11-14 16:58:30 -0800389 .mode = S_IRUGO | S_IWUSR,
Mark Zhan2e774c72007-07-17 04:05:05 -0700390 },
391 .read = m48t59_nvram_read,
392 .write = m48t59_nvram_write,
393};
394
395static int __devinit m48t59_rtc_probe(struct platform_device *pdev)
396{
397 struct m48t59_plat_data *pdata = pdev->dev.platform_data;
398 struct m48t59_private *m48t59 = NULL;
399 struct resource *res;
400 int ret = -ENOMEM;
Krzysztof Helt94fe7422008-09-03 15:12:34 -0700401 char *name;
402 const struct rtc_class_ops *ops;
Mark Zhan2e774c72007-07-17 04:05:05 -0700403
404 /* This chip could be memory-mapped or I/O-mapped */
405 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
406 if (!res) {
407 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
408 if (!res)
409 return -EINVAL;
410 }
411
412 if (res->flags & IORESOURCE_IO) {
413 /* If we are I/O-mapped, the platform should provide
414 * the operations accessing chip registers.
415 */
416 if (!pdata || !pdata->write_byte || !pdata->read_byte)
417 return -EINVAL;
418 } else if (res->flags & IORESOURCE_MEM) {
419 /* we are memory-mapped */
420 if (!pdata) {
421 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
422 if (!pdata)
423 return -ENOMEM;
424 /* Ensure we only kmalloc platform data once */
425 pdev->dev.platform_data = pdata;
426 }
Krzysztof Helt94fe7422008-09-03 15:12:34 -0700427 if (!pdata->type)
428 pdata->type = M48T59RTC_TYPE_M48T59;
Mark Zhan2e774c72007-07-17 04:05:05 -0700429
430 /* Try to use the generic memory read/write ops */
431 if (!pdata->write_byte)
432 pdata->write_byte = m48t59_mem_writeb;
433 if (!pdata->read_byte)
434 pdata->read_byte = m48t59_mem_readb;
435 }
436
437 m48t59 = kzalloc(sizeof(*m48t59), GFP_KERNEL);
438 if (!m48t59)
439 return -ENOMEM;
440
Krzysztof Helt64151ad2008-09-03 15:41:57 -0700441 m48t59->ioaddr = pdata->ioaddr;
442
443 if (!m48t59->ioaddr) {
444 /* ioaddr not mapped externally */
445 m48t59->ioaddr = ioremap(res->start, res->end - res->start + 1);
446 if (!m48t59->ioaddr)
447 goto out;
448 }
Mark Zhan2e774c72007-07-17 04:05:05 -0700449
450 /* Try to get irq number. We also can work in
451 * the mode without IRQ.
452 */
453 m48t59->irq = platform_get_irq(pdev, 0);
Anton Vorontsov2fac6672009-01-06 14:42:11 -0800454 if (m48t59->irq <= 0)
Mark Zhan2e774c72007-07-17 04:05:05 -0700455 m48t59->irq = NO_IRQ;
456
457 if (m48t59->irq != NO_IRQ) {
458 ret = request_irq(m48t59->irq, m48t59_rtc_interrupt,
459 IRQF_SHARED, "rtc-m48t59", &pdev->dev);
460 if (ret)
461 goto out;
462 }
Krzysztof Helt94fe7422008-09-03 15:12:34 -0700463 switch (pdata->type) {
464 case M48T59RTC_TYPE_M48T59:
465 name = "m48t59";
466 ops = &m48t59_rtc_ops;
467 pdata->offset = 0x1ff0;
468 break;
469 case M48T59RTC_TYPE_M48T02:
470 name = "m48t02";
471 ops = &m48t02_rtc_ops;
472 pdata->offset = 0x7f0;
473 break;
474 case M48T59RTC_TYPE_M48T08:
475 name = "m48t08";
476 ops = &m48t02_rtc_ops;
477 pdata->offset = 0x1ff0;
478 break;
479 default:
480 dev_err(&pdev->dev, "Unknown RTC type\n");
481 ret = -ENODEV;
482 goto out;
483 }
Mark Zhan2e774c72007-07-17 04:05:05 -0700484
Alessandro Zummob74d2ca2009-12-15 16:45:53 -0800485 spin_lock_init(&m48t59->lock);
486 platform_set_drvdata(pdev, m48t59);
487
Krzysztof Helt94fe7422008-09-03 15:12:34 -0700488 m48t59->rtc = rtc_device_register(name, &pdev->dev, ops, THIS_MODULE);
Mark Zhan2e774c72007-07-17 04:05:05 -0700489 if (IS_ERR(m48t59->rtc)) {
490 ret = PTR_ERR(m48t59->rtc);
491 goto out;
492 }
493
Krzysztof Helt94fe7422008-09-03 15:12:34 -0700494 m48t59_nvram_attr.size = pdata->offset;
495
Mark Zhan2e774c72007-07-17 04:05:05 -0700496 ret = sysfs_create_bin_file(&pdev->dev.kobj, &m48t59_nvram_attr);
Alessandro Zummob74d2ca2009-12-15 16:45:53 -0800497 if (ret) {
498 rtc_device_unregister(m48t59->rtc);
Mark Zhan2e774c72007-07-17 04:05:05 -0700499 goto out;
Alessandro Zummob74d2ca2009-12-15 16:45:53 -0800500 }
Mark Zhan2e774c72007-07-17 04:05:05 -0700501
Mark Zhan2e774c72007-07-17 04:05:05 -0700502 return 0;
503
504out:
Mark Zhan2e774c72007-07-17 04:05:05 -0700505 if (m48t59->irq != NO_IRQ)
506 free_irq(m48t59->irq, &pdev->dev);
507 if (m48t59->ioaddr)
508 iounmap(m48t59->ioaddr);
509 if (m48t59)
510 kfree(m48t59);
511 return ret;
512}
513
514static int __devexit m48t59_rtc_remove(struct platform_device *pdev)
515{
516 struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
Krzysztof Helt64151ad2008-09-03 15:41:57 -0700517 struct m48t59_plat_data *pdata = pdev->dev.platform_data;
Mark Zhan2e774c72007-07-17 04:05:05 -0700518
519 sysfs_remove_bin_file(&pdev->dev.kobj, &m48t59_nvram_attr);
520 if (!IS_ERR(m48t59->rtc))
521 rtc_device_unregister(m48t59->rtc);
Krzysztof Helt64151ad2008-09-03 15:41:57 -0700522 if (m48t59->ioaddr && !pdata->ioaddr)
Mark Zhan2e774c72007-07-17 04:05:05 -0700523 iounmap(m48t59->ioaddr);
524 if (m48t59->irq != NO_IRQ)
525 free_irq(m48t59->irq, &pdev->dev);
526 platform_set_drvdata(pdev, NULL);
527 kfree(m48t59);
528 return 0;
529}
530
Kay Sieversad28a072008-04-10 21:29:25 -0700531/* work with hotplug and coldplug */
532MODULE_ALIAS("platform:rtc-m48t59");
533
Randy Dunlap12730922007-11-05 14:51:00 -0800534static struct platform_driver m48t59_rtc_driver = {
Mark Zhan2e774c72007-07-17 04:05:05 -0700535 .driver = {
536 .name = "rtc-m48t59",
537 .owner = THIS_MODULE,
538 },
539 .probe = m48t59_rtc_probe,
540 .remove = __devexit_p(m48t59_rtc_remove),
541};
542
543static int __init m48t59_rtc_init(void)
544{
Randy Dunlap12730922007-11-05 14:51:00 -0800545 return platform_driver_register(&m48t59_rtc_driver);
Mark Zhan2e774c72007-07-17 04:05:05 -0700546}
547
548static void __exit m48t59_rtc_exit(void)
549{
Randy Dunlap12730922007-11-05 14:51:00 -0800550 platform_driver_unregister(&m48t59_rtc_driver);
Mark Zhan2e774c72007-07-17 04:05:05 -0700551}
552
553module_init(m48t59_rtc_init);
554module_exit(m48t59_rtc_exit);
555
556MODULE_AUTHOR("Mark Zhan <rongkai.zhan@windriver.com>");
Krzysztof Helt94fe7422008-09-03 15:12:34 -0700557MODULE_DESCRIPTION("M48T59/M48T02/M48T08 RTC driver");
Mark Zhan2e774c72007-07-17 04:05:05 -0700558MODULE_LICENSE("GPL");