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9b16c0a4 JS |
1 | /* |
2 | * RTC driver for Maxim MAX8998 | |
3 | * | |
4 | * Copyright (C) 2010 Samsung Electronics Co.Ltd | |
5 | * Author: Minkyu Kang <mk7.kang@samsung.com> | |
6 | * Author: Joonyoung Shim <jy0922.shim@samsung.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/i2c.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/bcd.h> | |
443c6ae2 | 19 | #include <linux/irqdomain.h> |
9b16c0a4 JS |
20 | #include <linux/rtc.h> |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/mfd/max8998.h> | |
23 | #include <linux/mfd/max8998-private.h> | |
337ce5d1 | 24 | #include <linux/delay.h> |
9b16c0a4 JS |
25 | |
26 | #define MAX8998_RTC_SEC 0x00 | |
27 | #define MAX8998_RTC_MIN 0x01 | |
28 | #define MAX8998_RTC_HOUR 0x02 | |
29 | #define MAX8998_RTC_WEEKDAY 0x03 | |
30 | #define MAX8998_RTC_DATE 0x04 | |
31 | #define MAX8998_RTC_MONTH 0x05 | |
32 | #define MAX8998_RTC_YEAR1 0x06 | |
33 | #define MAX8998_RTC_YEAR2 0x07 | |
34 | #define MAX8998_ALARM0_SEC 0x08 | |
35 | #define MAX8998_ALARM0_MIN 0x09 | |
36 | #define MAX8998_ALARM0_HOUR 0x0a | |
37 | #define MAX8998_ALARM0_WEEKDAY 0x0b | |
38 | #define MAX8998_ALARM0_DATE 0x0c | |
39 | #define MAX8998_ALARM0_MONTH 0x0d | |
40 | #define MAX8998_ALARM0_YEAR1 0x0e | |
41 | #define MAX8998_ALARM0_YEAR2 0x0f | |
42 | #define MAX8998_ALARM1_SEC 0x10 | |
43 | #define MAX8998_ALARM1_MIN 0x11 | |
44 | #define MAX8998_ALARM1_HOUR 0x12 | |
45 | #define MAX8998_ALARM1_WEEKDAY 0x13 | |
46 | #define MAX8998_ALARM1_DATE 0x14 | |
47 | #define MAX8998_ALARM1_MONTH 0x15 | |
48 | #define MAX8998_ALARM1_YEAR1 0x16 | |
49 | #define MAX8998_ALARM1_YEAR2 0x17 | |
50 | #define MAX8998_ALARM0_CONF 0x18 | |
51 | #define MAX8998_ALARM1_CONF 0x19 | |
52 | #define MAX8998_RTC_STATUS 0x1a | |
53 | #define MAX8998_WTSR_SMPL_CNTL 0x1b | |
54 | #define MAX8998_TEST 0x1f | |
55 | ||
56 | #define HOUR_12 (1 << 7) | |
57 | #define HOUR_PM (1 << 5) | |
58 | #define ALARM0_STATUS (1 << 1) | |
59 | #define ALARM1_STATUS (1 << 2) | |
60 | ||
61 | enum { | |
62 | RTC_SEC = 0, | |
63 | RTC_MIN, | |
64 | RTC_HOUR, | |
65 | RTC_WEEKDAY, | |
66 | RTC_DATE, | |
67 | RTC_MONTH, | |
68 | RTC_YEAR1, | |
69 | RTC_YEAR2, | |
70 | }; | |
71 | ||
72 | struct max8998_rtc_info { | |
73 | struct device *dev; | |
74 | struct max8998_dev *max8998; | |
75 | struct i2c_client *rtc; | |
76 | struct rtc_device *rtc_dev; | |
77 | int irq; | |
337ce5d1 | 78 | bool lp3974_bug_workaround; |
9b16c0a4 JS |
79 | }; |
80 | ||
81 | static void max8998_data_to_tm(u8 *data, struct rtc_time *tm) | |
82 | { | |
83 | tm->tm_sec = bcd2bin(data[RTC_SEC]); | |
84 | tm->tm_min = bcd2bin(data[RTC_MIN]); | |
85 | if (data[RTC_HOUR] & HOUR_12) { | |
86 | tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f); | |
87 | if (data[RTC_HOUR] & HOUR_PM) | |
88 | tm->tm_hour += 12; | |
89 | } else | |
90 | tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f); | |
91 | ||
92 | tm->tm_wday = data[RTC_WEEKDAY] & 0x07; | |
93 | tm->tm_mday = bcd2bin(data[RTC_DATE]); | |
94 | tm->tm_mon = bcd2bin(data[RTC_MONTH]); | |
95 | tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100; | |
96 | tm->tm_year -= 1900; | |
97 | } | |
98 | ||
99 | static void max8998_tm_to_data(struct rtc_time *tm, u8 *data) | |
100 | { | |
101 | data[RTC_SEC] = bin2bcd(tm->tm_sec); | |
102 | data[RTC_MIN] = bin2bcd(tm->tm_min); | |
103 | data[RTC_HOUR] = bin2bcd(tm->tm_hour); | |
104 | data[RTC_WEEKDAY] = tm->tm_wday; | |
105 | data[RTC_DATE] = bin2bcd(tm->tm_mday); | |
106 | data[RTC_MONTH] = bin2bcd(tm->tm_mon); | |
107 | data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100); | |
108 | data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100); | |
109 | } | |
110 | ||
111 | static int max8998_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
112 | { | |
113 | struct max8998_rtc_info *info = dev_get_drvdata(dev); | |
114 | u8 data[8]; | |
115 | int ret; | |
116 | ||
117 | ret = max8998_bulk_read(info->rtc, MAX8998_RTC_SEC, 8, data); | |
118 | if (ret < 0) | |
119 | return ret; | |
120 | ||
121 | max8998_data_to_tm(data, tm); | |
122 | ||
123 | return rtc_valid_tm(tm); | |
124 | } | |
125 | ||
126 | static int max8998_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
127 | { | |
128 | struct max8998_rtc_info *info = dev_get_drvdata(dev); | |
129 | u8 data[8]; | |
337ce5d1 | 130 | int ret; |
9b16c0a4 JS |
131 | |
132 | max8998_tm_to_data(tm, data); | |
133 | ||
337ce5d1 MH |
134 | ret = max8998_bulk_write(info->rtc, MAX8998_RTC_SEC, 8, data); |
135 | ||
136 | if (info->lp3974_bug_workaround) | |
137 | msleep(2000); | |
138 | ||
139 | return ret; | |
9b16c0a4 JS |
140 | } |
141 | ||
142 | static int max8998_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
143 | { | |
144 | struct max8998_rtc_info *info = dev_get_drvdata(dev); | |
145 | u8 data[8]; | |
146 | u8 val; | |
147 | int ret; | |
148 | ||
149 | ret = max8998_bulk_read(info->rtc, MAX8998_ALARM0_SEC, 8, data); | |
150 | if (ret < 0) | |
151 | return ret; | |
152 | ||
153 | max8998_data_to_tm(data, &alrm->time); | |
154 | ||
155 | ret = max8998_read_reg(info->rtc, MAX8998_ALARM0_CONF, &val); | |
156 | if (ret < 0) | |
157 | return ret; | |
158 | ||
159 | alrm->enabled = !!val; | |
160 | ||
161 | ret = max8998_read_reg(info->rtc, MAX8998_RTC_STATUS, &val); | |
162 | if (ret < 0) | |
163 | return ret; | |
164 | ||
165 | if (val & ALARM0_STATUS) | |
166 | alrm->pending = 1; | |
167 | else | |
168 | alrm->pending = 0; | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | static int max8998_rtc_stop_alarm(struct max8998_rtc_info *info) | |
174 | { | |
337ce5d1 MH |
175 | int ret = max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, 0); |
176 | ||
177 | if (info->lp3974_bug_workaround) | |
178 | msleep(2000); | |
179 | ||
180 | return ret; | |
9b16c0a4 JS |
181 | } |
182 | ||
183 | static int max8998_rtc_start_alarm(struct max8998_rtc_info *info) | |
184 | { | |
337ce5d1 MH |
185 | int ret; |
186 | u8 alarm0_conf = 0x77; | |
187 | ||
188 | /* LP3974 with delay bug chips has rtc alarm bugs with "MONTH" field */ | |
189 | if (info->lp3974_bug_workaround) | |
190 | alarm0_conf = 0x57; | |
191 | ||
192 | ret = max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, alarm0_conf); | |
193 | ||
194 | if (info->lp3974_bug_workaround) | |
195 | msleep(2000); | |
196 | ||
197 | return ret; | |
9b16c0a4 JS |
198 | } |
199 | ||
200 | static int max8998_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
201 | { | |
202 | struct max8998_rtc_info *info = dev_get_drvdata(dev); | |
203 | u8 data[8]; | |
204 | int ret; | |
205 | ||
206 | max8998_tm_to_data(&alrm->time, data); | |
207 | ||
208 | ret = max8998_rtc_stop_alarm(info); | |
209 | if (ret < 0) | |
210 | return ret; | |
211 | ||
212 | ret = max8998_bulk_write(info->rtc, MAX8998_ALARM0_SEC, 8, data); | |
213 | if (ret < 0) | |
214 | return ret; | |
215 | ||
337ce5d1 MH |
216 | if (info->lp3974_bug_workaround) |
217 | msleep(2000); | |
218 | ||
9b16c0a4 | 219 | if (alrm->enabled) |
337ce5d1 | 220 | ret = max8998_rtc_start_alarm(info); |
9b16c0a4 | 221 | |
337ce5d1 | 222 | return ret; |
9b16c0a4 JS |
223 | } |
224 | ||
225 | static int max8998_rtc_alarm_irq_enable(struct device *dev, | |
226 | unsigned int enabled) | |
227 | { | |
228 | struct max8998_rtc_info *info = dev_get_drvdata(dev); | |
229 | ||
230 | if (enabled) | |
231 | return max8998_rtc_start_alarm(info); | |
232 | else | |
233 | return max8998_rtc_stop_alarm(info); | |
234 | } | |
235 | ||
236 | static irqreturn_t max8998_rtc_alarm_irq(int irq, void *data) | |
237 | { | |
238 | struct max8998_rtc_info *info = data; | |
239 | ||
240 | rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF); | |
241 | ||
242 | return IRQ_HANDLED; | |
243 | } | |
244 | ||
245 | static const struct rtc_class_ops max8998_rtc_ops = { | |
246 | .read_time = max8998_rtc_read_time, | |
247 | .set_time = max8998_rtc_set_time, | |
248 | .read_alarm = max8998_rtc_read_alarm, | |
249 | .set_alarm = max8998_rtc_set_alarm, | |
250 | .alarm_irq_enable = max8998_rtc_alarm_irq_enable, | |
251 | }; | |
252 | ||
5a167f45 | 253 | static int max8998_rtc_probe(struct platform_device *pdev) |
9b16c0a4 JS |
254 | { |
255 | struct max8998_dev *max8998 = dev_get_drvdata(pdev->dev.parent); | |
ee999fb3 | 256 | struct max8998_platform_data *pdata = max8998->pdata; |
9b16c0a4 JS |
257 | struct max8998_rtc_info *info; |
258 | int ret; | |
259 | ||
8925e31a JH |
260 | info = devm_kzalloc(&pdev->dev, sizeof(struct max8998_rtc_info), |
261 | GFP_KERNEL); | |
9b16c0a4 JS |
262 | if (!info) |
263 | return -ENOMEM; | |
264 | ||
265 | info->dev = &pdev->dev; | |
266 | info->max8998 = max8998; | |
267 | info->rtc = max8998->rtc; | |
9b16c0a4 | 268 | |
03cf7c47 JS |
269 | platform_set_drvdata(pdev, info); |
270 | ||
8925e31a | 271 | info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8998-rtc", |
9b16c0a4 JS |
272 | &max8998_rtc_ops, THIS_MODULE); |
273 | ||
274 | if (IS_ERR(info->rtc_dev)) { | |
275 | ret = PTR_ERR(info->rtc_dev); | |
276 | dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); | |
4802f224 | 277 | return ret; |
9b16c0a4 JS |
278 | } |
279 | ||
443c6ae2 TF |
280 | if (!max8998->irq_domain) |
281 | goto no_irq; | |
282 | ||
283 | info->irq = irq_create_mapping(max8998->irq_domain, MAX8998_IRQ_ALARM0); | |
284 | if (!info->irq) { | |
285 | dev_warn(&pdev->dev, "Failed to map alarm IRQ\n"); | |
286 | goto no_irq; | |
287 | } | |
288 | ||
8925e31a JH |
289 | ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL, |
290 | max8998_rtc_alarm_irq, 0, "rtc-alarm0", info); | |
337ce5d1 | 291 | |
9b16c0a4 JS |
292 | if (ret < 0) |
293 | dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n", | |
294 | info->irq, ret); | |
295 | ||
443c6ae2 | 296 | no_irq: |
337ce5d1 | 297 | dev_info(&pdev->dev, "RTC CHIP NAME: %s\n", pdev->id_entry->name); |
43c523bf | 298 | if (pdata && pdata->rtc_delay) { |
337ce5d1 MH |
299 | info->lp3974_bug_workaround = true; |
300 | dev_warn(&pdev->dev, "LP3974 with RTC REGERR option." | |
301 | " RTC updates will be extremely slow.\n"); | |
302 | } | |
303 | ||
9b16c0a4 | 304 | return 0; |
9b16c0a4 JS |
305 | } |
306 | ||
337ce5d1 MH |
307 | static const struct platform_device_id max8998_rtc_id[] = { |
308 | { "max8998-rtc", TYPE_MAX8998 }, | |
309 | { "lp3974-rtc", TYPE_LP3974 }, | |
310 | { } | |
311 | }; | |
312 | ||
9b16c0a4 JS |
313 | static struct platform_driver max8998_rtc_driver = { |
314 | .driver = { | |
315 | .name = "max8998-rtc", | |
9b16c0a4 JS |
316 | }, |
317 | .probe = max8998_rtc_probe, | |
337ce5d1 | 318 | .id_table = max8998_rtc_id, |
9b16c0a4 JS |
319 | }; |
320 | ||
0c4eae66 | 321 | module_platform_driver(max8998_rtc_driver); |
9b16c0a4 JS |
322 | |
323 | MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>"); | |
324 | MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); | |
325 | MODULE_DESCRIPTION("Maxim MAX8998 RTC driver"); | |
326 | MODULE_LICENSE("GPL"); |