Commit | Line | Data |
---|---|---|
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> | |
19 | #include <linux/rtc.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/mfd/max8998.h> | |
22 | #include <linux/mfd/max8998-private.h> | |
23 | ||
24 | #define MAX8998_RTC_SEC 0x00 | |
25 | #define MAX8998_RTC_MIN 0x01 | |
26 | #define MAX8998_RTC_HOUR 0x02 | |
27 | #define MAX8998_RTC_WEEKDAY 0x03 | |
28 | #define MAX8998_RTC_DATE 0x04 | |
29 | #define MAX8998_RTC_MONTH 0x05 | |
30 | #define MAX8998_RTC_YEAR1 0x06 | |
31 | #define MAX8998_RTC_YEAR2 0x07 | |
32 | #define MAX8998_ALARM0_SEC 0x08 | |
33 | #define MAX8998_ALARM0_MIN 0x09 | |
34 | #define MAX8998_ALARM0_HOUR 0x0a | |
35 | #define MAX8998_ALARM0_WEEKDAY 0x0b | |
36 | #define MAX8998_ALARM0_DATE 0x0c | |
37 | #define MAX8998_ALARM0_MONTH 0x0d | |
38 | #define MAX8998_ALARM0_YEAR1 0x0e | |
39 | #define MAX8998_ALARM0_YEAR2 0x0f | |
40 | #define MAX8998_ALARM1_SEC 0x10 | |
41 | #define MAX8998_ALARM1_MIN 0x11 | |
42 | #define MAX8998_ALARM1_HOUR 0x12 | |
43 | #define MAX8998_ALARM1_WEEKDAY 0x13 | |
44 | #define MAX8998_ALARM1_DATE 0x14 | |
45 | #define MAX8998_ALARM1_MONTH 0x15 | |
46 | #define MAX8998_ALARM1_YEAR1 0x16 | |
47 | #define MAX8998_ALARM1_YEAR2 0x17 | |
48 | #define MAX8998_ALARM0_CONF 0x18 | |
49 | #define MAX8998_ALARM1_CONF 0x19 | |
50 | #define MAX8998_RTC_STATUS 0x1a | |
51 | #define MAX8998_WTSR_SMPL_CNTL 0x1b | |
52 | #define MAX8998_TEST 0x1f | |
53 | ||
54 | #define HOUR_12 (1 << 7) | |
55 | #define HOUR_PM (1 << 5) | |
56 | #define ALARM0_STATUS (1 << 1) | |
57 | #define ALARM1_STATUS (1 << 2) | |
58 | ||
59 | enum { | |
60 | RTC_SEC = 0, | |
61 | RTC_MIN, | |
62 | RTC_HOUR, | |
63 | RTC_WEEKDAY, | |
64 | RTC_DATE, | |
65 | RTC_MONTH, | |
66 | RTC_YEAR1, | |
67 | RTC_YEAR2, | |
68 | }; | |
69 | ||
70 | struct max8998_rtc_info { | |
71 | struct device *dev; | |
72 | struct max8998_dev *max8998; | |
73 | struct i2c_client *rtc; | |
74 | struct rtc_device *rtc_dev; | |
75 | int irq; | |
76 | }; | |
77 | ||
78 | static void max8998_data_to_tm(u8 *data, struct rtc_time *tm) | |
79 | { | |
80 | tm->tm_sec = bcd2bin(data[RTC_SEC]); | |
81 | tm->tm_min = bcd2bin(data[RTC_MIN]); | |
82 | if (data[RTC_HOUR] & HOUR_12) { | |
83 | tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f); | |
84 | if (data[RTC_HOUR] & HOUR_PM) | |
85 | tm->tm_hour += 12; | |
86 | } else | |
87 | tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f); | |
88 | ||
89 | tm->tm_wday = data[RTC_WEEKDAY] & 0x07; | |
90 | tm->tm_mday = bcd2bin(data[RTC_DATE]); | |
91 | tm->tm_mon = bcd2bin(data[RTC_MONTH]); | |
92 | tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100; | |
93 | tm->tm_year -= 1900; | |
94 | } | |
95 | ||
96 | static void max8998_tm_to_data(struct rtc_time *tm, u8 *data) | |
97 | { | |
98 | data[RTC_SEC] = bin2bcd(tm->tm_sec); | |
99 | data[RTC_MIN] = bin2bcd(tm->tm_min); | |
100 | data[RTC_HOUR] = bin2bcd(tm->tm_hour); | |
101 | data[RTC_WEEKDAY] = tm->tm_wday; | |
102 | data[RTC_DATE] = bin2bcd(tm->tm_mday); | |
103 | data[RTC_MONTH] = bin2bcd(tm->tm_mon); | |
104 | data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100); | |
105 | data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100); | |
106 | } | |
107 | ||
108 | static int max8998_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
109 | { | |
110 | struct max8998_rtc_info *info = dev_get_drvdata(dev); | |
111 | u8 data[8]; | |
112 | int ret; | |
113 | ||
114 | ret = max8998_bulk_read(info->rtc, MAX8998_RTC_SEC, 8, data); | |
115 | if (ret < 0) | |
116 | return ret; | |
117 | ||
118 | max8998_data_to_tm(data, tm); | |
119 | ||
120 | return rtc_valid_tm(tm); | |
121 | } | |
122 | ||
123 | static int max8998_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
124 | { | |
125 | struct max8998_rtc_info *info = dev_get_drvdata(dev); | |
126 | u8 data[8]; | |
127 | ||
128 | max8998_tm_to_data(tm, data); | |
129 | ||
130 | return max8998_bulk_write(info->rtc, MAX8998_RTC_SEC, 8, data); | |
131 | } | |
132 | ||
133 | static int max8998_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
134 | { | |
135 | struct max8998_rtc_info *info = dev_get_drvdata(dev); | |
136 | u8 data[8]; | |
137 | u8 val; | |
138 | int ret; | |
139 | ||
140 | ret = max8998_bulk_read(info->rtc, MAX8998_ALARM0_SEC, 8, data); | |
141 | if (ret < 0) | |
142 | return ret; | |
143 | ||
144 | max8998_data_to_tm(data, &alrm->time); | |
145 | ||
146 | ret = max8998_read_reg(info->rtc, MAX8998_ALARM0_CONF, &val); | |
147 | if (ret < 0) | |
148 | return ret; | |
149 | ||
150 | alrm->enabled = !!val; | |
151 | ||
152 | ret = max8998_read_reg(info->rtc, MAX8998_RTC_STATUS, &val); | |
153 | if (ret < 0) | |
154 | return ret; | |
155 | ||
156 | if (val & ALARM0_STATUS) | |
157 | alrm->pending = 1; | |
158 | else | |
159 | alrm->pending = 0; | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | static int max8998_rtc_stop_alarm(struct max8998_rtc_info *info) | |
165 | { | |
166 | return max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, 0); | |
167 | } | |
168 | ||
169 | static int max8998_rtc_start_alarm(struct max8998_rtc_info *info) | |
170 | { | |
171 | return max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, 0x77); | |
172 | } | |
173 | ||
174 | static int max8998_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
175 | { | |
176 | struct max8998_rtc_info *info = dev_get_drvdata(dev); | |
177 | u8 data[8]; | |
178 | int ret; | |
179 | ||
180 | max8998_tm_to_data(&alrm->time, data); | |
181 | ||
182 | ret = max8998_rtc_stop_alarm(info); | |
183 | if (ret < 0) | |
184 | return ret; | |
185 | ||
186 | ret = max8998_bulk_write(info->rtc, MAX8998_ALARM0_SEC, 8, data); | |
187 | if (ret < 0) | |
188 | return ret; | |
189 | ||
190 | if (alrm->enabled) | |
191 | return max8998_rtc_start_alarm(info); | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | static int max8998_rtc_alarm_irq_enable(struct device *dev, | |
197 | unsigned int enabled) | |
198 | { | |
199 | struct max8998_rtc_info *info = dev_get_drvdata(dev); | |
200 | ||
201 | if (enabled) | |
202 | return max8998_rtc_start_alarm(info); | |
203 | else | |
204 | return max8998_rtc_stop_alarm(info); | |
205 | } | |
206 | ||
207 | static irqreturn_t max8998_rtc_alarm_irq(int irq, void *data) | |
208 | { | |
209 | struct max8998_rtc_info *info = data; | |
210 | ||
211 | rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF); | |
212 | ||
213 | return IRQ_HANDLED; | |
214 | } | |
215 | ||
216 | static const struct rtc_class_ops max8998_rtc_ops = { | |
217 | .read_time = max8998_rtc_read_time, | |
218 | .set_time = max8998_rtc_set_time, | |
219 | .read_alarm = max8998_rtc_read_alarm, | |
220 | .set_alarm = max8998_rtc_set_alarm, | |
221 | .alarm_irq_enable = max8998_rtc_alarm_irq_enable, | |
222 | }; | |
223 | ||
224 | static int __devinit max8998_rtc_probe(struct platform_device *pdev) | |
225 | { | |
226 | struct max8998_dev *max8998 = dev_get_drvdata(pdev->dev.parent); | |
227 | struct max8998_rtc_info *info; | |
228 | int ret; | |
229 | ||
230 | info = kzalloc(sizeof(struct max8998_rtc_info), GFP_KERNEL); | |
231 | if (!info) | |
232 | return -ENOMEM; | |
233 | ||
234 | info->dev = &pdev->dev; | |
235 | info->max8998 = max8998; | |
236 | info->rtc = max8998->rtc; | |
237 | info->irq = max8998->irq_base + MAX8998_IRQ_ALARM0; | |
238 | ||
239 | info->rtc_dev = rtc_device_register("max8998-rtc", &pdev->dev, | |
240 | &max8998_rtc_ops, THIS_MODULE); | |
241 | ||
242 | if (IS_ERR(info->rtc_dev)) { | |
243 | ret = PTR_ERR(info->rtc_dev); | |
244 | dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); | |
245 | goto out_rtc; | |
246 | } | |
247 | ||
248 | platform_set_drvdata(pdev, info); | |
249 | ||
250 | ret = request_threaded_irq(info->irq, NULL, max8998_rtc_alarm_irq, 0, | |
251 | "rtc-alarm0", info); | |
252 | if (ret < 0) | |
253 | dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n", | |
254 | info->irq, ret); | |
255 | ||
256 | return 0; | |
257 | ||
258 | out_rtc: | |
259 | kfree(info); | |
260 | return ret; | |
261 | } | |
262 | ||
263 | static int __devexit max8998_rtc_remove(struct platform_device *pdev) | |
264 | { | |
265 | struct max8998_rtc_info *info = platform_get_drvdata(pdev); | |
266 | ||
267 | if (info) { | |
268 | free_irq(info->irq, info); | |
269 | rtc_device_unregister(info->rtc_dev); | |
270 | kfree(info); | |
271 | } | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static struct platform_driver max8998_rtc_driver = { | |
277 | .driver = { | |
278 | .name = "max8998-rtc", | |
279 | .owner = THIS_MODULE, | |
280 | }, | |
281 | .probe = max8998_rtc_probe, | |
282 | .remove = __devexit_p(max8998_rtc_remove), | |
283 | }; | |
284 | ||
285 | static int __init max8998_rtc_init(void) | |
286 | { | |
287 | return platform_driver_register(&max8998_rtc_driver); | |
288 | } | |
289 | module_init(max8998_rtc_init); | |
290 | ||
291 | static void __exit max8998_rtc_exit(void) | |
292 | { | |
293 | platform_driver_unregister(&max8998_rtc_driver); | |
294 | } | |
295 | module_exit(max8998_rtc_exit); | |
296 | ||
297 | MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>"); | |
298 | MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); | |
299 | MODULE_DESCRIPTION("Maxim MAX8998 RTC driver"); | |
300 | MODULE_LICENSE("GPL"); |