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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
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2 | /* |
3 | * RTC driver for Maxim MAX8907 | |
4 | * | |
5 | * Copyright (c) 2011-2012, NVIDIA Corporation. | |
6 | * | |
7 | * Based on drivers/rtc/rtc-max8925.c, | |
8 | * Copyright (C) 2009-2010 Marvell International Ltd. | |
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9 | */ |
10 | ||
11 | #include <linux/bcd.h> | |
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12 | #include <linux/mfd/max8907.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/regmap.h> | |
16 | #include <linux/rtc.h> | |
17 | #include <linux/slab.h> | |
18 | ||
19 | enum { | |
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 TIME_NUM 8 | |
31 | #define ALARM_1SEC (1 << 7) | |
32 | #define HOUR_12 (1 << 7) | |
33 | #define HOUR_AM_PM (1 << 5) | |
34 | #define ALARM0_IRQ (1 << 3) | |
35 | #define ALARM1_IRQ (1 << 2) | |
36 | #define ALARM0_STATUS (1 << 2) | |
37 | #define ALARM1_STATUS (1 << 1) | |
38 | ||
39 | struct max8907_rtc { | |
40 | struct max8907 *max8907; | |
41 | struct regmap *regmap; | |
42 | struct rtc_device *rtc_dev; | |
43 | int irq; | |
44 | }; | |
45 | ||
46 | static irqreturn_t max8907_irq_handler(int irq, void *data) | |
47 | { | |
48 | struct max8907_rtc *rtc = data; | |
49 | ||
75ea799d | 50 | regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0); |
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51 | |
52 | rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF); | |
53 | ||
54 | return IRQ_HANDLED; | |
55 | } | |
56 | ||
57 | static void regs_to_tm(u8 *regs, struct rtc_time *tm) | |
58 | { | |
59 | tm->tm_year = bcd2bin(regs[RTC_YEAR2]) * 100 + | |
60 | bcd2bin(regs[RTC_YEAR1]) - 1900; | |
61 | tm->tm_mon = bcd2bin(regs[RTC_MONTH] & 0x1f) - 1; | |
62 | tm->tm_mday = bcd2bin(regs[RTC_DATE] & 0x3f); | |
75ea799d | 63 | tm->tm_wday = (regs[RTC_WEEKDAY] & 0x07); |
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64 | if (regs[RTC_HOUR] & HOUR_12) { |
65 | tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x01f); | |
66 | if (tm->tm_hour == 12) | |
67 | tm->tm_hour = 0; | |
68 | if (regs[RTC_HOUR] & HOUR_AM_PM) | |
69 | tm->tm_hour += 12; | |
70 | } else { | |
71 | tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x03f); | |
72 | } | |
73 | tm->tm_min = bcd2bin(regs[RTC_MIN] & 0x7f); | |
74 | tm->tm_sec = bcd2bin(regs[RTC_SEC] & 0x7f); | |
75 | } | |
76 | ||
77 | static void tm_to_regs(struct rtc_time *tm, u8 *regs) | |
78 | { | |
79 | u8 high, low; | |
80 | ||
81 | high = (tm->tm_year + 1900) / 100; | |
82 | low = tm->tm_year % 100; | |
83 | regs[RTC_YEAR2] = bin2bcd(high); | |
84 | regs[RTC_YEAR1] = bin2bcd(low); | |
85 | regs[RTC_MONTH] = bin2bcd(tm->tm_mon + 1); | |
86 | regs[RTC_DATE] = bin2bcd(tm->tm_mday); | |
75ea799d | 87 | regs[RTC_WEEKDAY] = tm->tm_wday; |
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88 | regs[RTC_HOUR] = bin2bcd(tm->tm_hour); |
89 | regs[RTC_MIN] = bin2bcd(tm->tm_min); | |
90 | regs[RTC_SEC] = bin2bcd(tm->tm_sec); | |
91 | } | |
92 | ||
93 | static int max8907_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
94 | { | |
95 | struct max8907_rtc *rtc = dev_get_drvdata(dev); | |
96 | u8 regs[TIME_NUM]; | |
97 | int ret; | |
98 | ||
99 | ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_RTC_SEC, regs, | |
100 | TIME_NUM); | |
101 | if (ret < 0) | |
102 | return ret; | |
103 | ||
104 | regs_to_tm(regs, tm); | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static int max8907_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
110 | { | |
111 | struct max8907_rtc *rtc = dev_get_drvdata(dev); | |
112 | u8 regs[TIME_NUM]; | |
113 | ||
114 | tm_to_regs(tm, regs); | |
115 | ||
116 | return regmap_bulk_write(rtc->regmap, MAX8907_REG_RTC_SEC, regs, | |
117 | TIME_NUM); | |
118 | } | |
119 | ||
120 | static int max8907_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
121 | { | |
122 | struct max8907_rtc *rtc = dev_get_drvdata(dev); | |
123 | u8 regs[TIME_NUM]; | |
124 | unsigned int val; | |
125 | int ret; | |
126 | ||
127 | ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs, | |
128 | TIME_NUM); | |
129 | if (ret < 0) | |
130 | return ret; | |
131 | ||
132 | regs_to_tm(regs, &alrm->time); | |
133 | ||
134 | ret = regmap_read(rtc->regmap, MAX8907_REG_ALARM0_CNTL, &val); | |
135 | if (ret < 0) | |
136 | return ret; | |
137 | ||
138 | alrm->enabled = !!(val & 0x7f); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | static int max8907_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
144 | { | |
145 | struct max8907_rtc *rtc = dev_get_drvdata(dev); | |
146 | u8 regs[TIME_NUM]; | |
147 | int ret; | |
148 | ||
149 | tm_to_regs(&alrm->time, regs); | |
150 | ||
151 | /* Disable alarm while we update the target time */ | |
75ea799d | 152 | ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0); |
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153 | if (ret < 0) |
154 | return ret; | |
155 | ||
156 | ret = regmap_bulk_write(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs, | |
157 | TIME_NUM); | |
158 | if (ret < 0) | |
159 | return ret; | |
160 | ||
161 | if (alrm->enabled) | |
75ea799d | 162 | ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0x77); |
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163 | |
164 | return ret; | |
165 | } | |
166 | ||
167 | static const struct rtc_class_ops max8907_rtc_ops = { | |
168 | .read_time = max8907_rtc_read_time, | |
169 | .set_time = max8907_rtc_set_time, | |
170 | .read_alarm = max8907_rtc_read_alarm, | |
171 | .set_alarm = max8907_rtc_set_alarm, | |
172 | }; | |
173 | ||
5a167f45 | 174 | static int max8907_rtc_probe(struct platform_device *pdev) |
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175 | { |
176 | struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent); | |
177 | struct max8907_rtc *rtc; | |
178 | int ret; | |
179 | ||
180 | rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); | |
181 | if (!rtc) | |
182 | return -ENOMEM; | |
183 | platform_set_drvdata(pdev, rtc); | |
184 | ||
185 | rtc->max8907 = max8907; | |
186 | rtc->regmap = max8907->regmap_rtc; | |
187 | ||
ac4e7d49 | 188 | rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8907-rtc", |
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189 | &max8907_rtc_ops, THIS_MODULE); |
190 | if (IS_ERR(rtc->rtc_dev)) { | |
191 | ret = PTR_ERR(rtc->rtc_dev); | |
192 | dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); | |
193 | return ret; | |
194 | } | |
195 | ||
196 | rtc->irq = regmap_irq_get_virq(max8907->irqc_rtc, | |
197 | MAX8907_IRQ_RTC_ALARM0); | |
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198 | if (rtc->irq < 0) |
199 | return rtc->irq; | |
94c01ab6 | 200 | |
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201 | ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL, |
202 | max8907_irq_handler, | |
203 | IRQF_ONESHOT, "max8907-alarm0", rtc); | |
2fa76062 | 204 | if (ret < 0) |
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205 | dev_err(&pdev->dev, "Failed to request IRQ%d: %d\n", |
206 | rtc->irq, ret); | |
94c01ab6 | 207 | |
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208 | return ret; |
209 | } | |
210 | ||
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211 | static struct platform_driver max8907_rtc_driver = { |
212 | .driver = { | |
213 | .name = "max8907-rtc", | |
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214 | }, |
215 | .probe = max8907_rtc_probe, | |
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216 | }; |
217 | module_platform_driver(max8907_rtc_driver); | |
218 | ||
219 | MODULE_DESCRIPTION("Maxim MAX8907 RTC driver"); | |
220 | MODULE_LICENSE("GPL v2"); |