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1 | /* |
2 | * RTC driver for Maxim MAX8907 |
3 | * |
4 | * Copyright (c) 2011-2012, NVIDIA Corporation. |
5 | * |
6 | * Based on drivers/rtc/rtc-max8925.c, |
7 | * Copyright (C) 2009-2010 Marvell International Ltd. |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License version 2 as |
11 | * published by the Free Software Foundation. |
12 | */ |
13 | |
14 | #include <linux/bcd.h> |
15 | #include <linux/i2c.h> |
16 | #include <linux/mfd/max8907.h> |
17 | #include <linux/module.h> |
18 | #include <linux/platform_device.h> |
19 | #include <linux/regmap.h> |
20 | #include <linux/rtc.h> |
21 | #include <linux/slab.h> |
22 | |
23 | enum { |
24 | RTC_SEC = 0, |
25 | RTC_MIN, |
26 | RTC_HOUR, |
27 | RTC_WEEKDAY, |
28 | RTC_DATE, |
29 | RTC_MONTH, |
30 | RTC_YEAR1, |
31 | RTC_YEAR2, |
32 | }; |
33 | |
34 | #define TIME_NUM 8 |
35 | #define ALARM_1SEC (1 << 7) |
36 | #define HOUR_12 (1 << 7) |
37 | #define HOUR_AM_PM (1 << 5) |
38 | #define ALARM0_IRQ (1 << 3) |
39 | #define ALARM1_IRQ (1 << 2) |
40 | #define ALARM0_STATUS (1 << 2) |
41 | #define ALARM1_STATUS (1 << 1) |
42 | |
43 | struct max8907_rtc { |
44 | struct max8907 *max8907; |
45 | struct regmap *regmap; |
46 | struct rtc_device *rtc_dev; |
47 | int irq; |
48 | }; |
49 | |
50 | static irqreturn_t max8907_irq_handler(int irq, void *data) |
51 | { |
52 | struct max8907_rtc *rtc = data; |
53 | |
54 | regmap_update_bits(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0x7f, 0); |
55 | |
56 | rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF); |
57 | |
58 | return IRQ_HANDLED; |
59 | } |
60 | |
61 | static void regs_to_tm(u8 *regs, struct rtc_time *tm) |
62 | { |
63 | tm->tm_year = bcd2bin(regs[RTC_YEAR2]) * 100 + |
64 | bcd2bin(regs[RTC_YEAR1]) - 1900; |
65 | tm->tm_mon = bcd2bin(regs[RTC_MONTH] & 0x1f) - 1; |
66 | tm->tm_mday = bcd2bin(regs[RTC_DATE] & 0x3f); |
67 | tm->tm_wday = (regs[RTC_WEEKDAY] & 0x07) - 1; |
68 | if (regs[RTC_HOUR] & HOUR_12) { |
69 | tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x01f); |
70 | if (tm->tm_hour == 12) |
71 | tm->tm_hour = 0; |
72 | if (regs[RTC_HOUR] & HOUR_AM_PM) |
73 | tm->tm_hour += 12; |
74 | } else { |
75 | tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x03f); |
76 | } |
77 | tm->tm_min = bcd2bin(regs[RTC_MIN] & 0x7f); |
78 | tm->tm_sec = bcd2bin(regs[RTC_SEC] & 0x7f); |
79 | } |
80 | |
81 | static void tm_to_regs(struct rtc_time *tm, u8 *regs) |
82 | { |
83 | u8 high, low; |
84 | |
85 | high = (tm->tm_year + 1900) / 100; |
86 | low = tm->tm_year % 100; |
87 | regs[RTC_YEAR2] = bin2bcd(high); |
88 | regs[RTC_YEAR1] = bin2bcd(low); |
89 | regs[RTC_MONTH] = bin2bcd(tm->tm_mon + 1); |
90 | regs[RTC_DATE] = bin2bcd(tm->tm_mday); |
91 | regs[RTC_WEEKDAY] = tm->tm_wday + 1; |
92 | regs[RTC_HOUR] = bin2bcd(tm->tm_hour); |
93 | regs[RTC_MIN] = bin2bcd(tm->tm_min); |
94 | regs[RTC_SEC] = bin2bcd(tm->tm_sec); |
95 | } |
96 | |
97 | static int max8907_rtc_read_time(struct device *dev, struct rtc_time *tm) |
98 | { |
99 | struct max8907_rtc *rtc = dev_get_drvdata(dev); |
100 | u8 regs[TIME_NUM]; |
101 | int ret; |
102 | |
103 | ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_RTC_SEC, regs, |
104 | TIME_NUM); |
105 | if (ret < 0) |
106 | return ret; |
107 | |
108 | regs_to_tm(regs, tm); |
109 | |
110 | return 0; |
111 | } |
112 | |
113 | static int max8907_rtc_set_time(struct device *dev, struct rtc_time *tm) |
114 | { |
115 | struct max8907_rtc *rtc = dev_get_drvdata(dev); |
116 | u8 regs[TIME_NUM]; |
117 | |
118 | tm_to_regs(tm, regs); |
119 | |
120 | return regmap_bulk_write(rtc->regmap, MAX8907_REG_RTC_SEC, regs, |
121 | TIME_NUM); |
122 | } |
123 | |
124 | static int max8907_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
125 | { |
126 | struct max8907_rtc *rtc = dev_get_drvdata(dev); |
127 | u8 regs[TIME_NUM]; |
128 | unsigned int val; |
129 | int ret; |
130 | |
131 | ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs, |
132 | TIME_NUM); |
133 | if (ret < 0) |
134 | return ret; |
135 | |
136 | regs_to_tm(regs, &alrm->time); |
137 | |
138 | ret = regmap_read(rtc->regmap, MAX8907_REG_ALARM0_CNTL, &val); |
139 | if (ret < 0) |
140 | return ret; |
141 | |
142 | alrm->enabled = !!(val & 0x7f); |
143 | |
144 | return 0; |
145 | } |
146 | |
147 | static int max8907_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
148 | { |
149 | struct max8907_rtc *rtc = dev_get_drvdata(dev); |
150 | u8 regs[TIME_NUM]; |
151 | int ret; |
152 | |
153 | tm_to_regs(&alrm->time, regs); |
154 | |
155 | /* Disable alarm while we update the target time */ |
156 | ret = regmap_update_bits(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0x7f, 0); |
157 | if (ret < 0) |
158 | return ret; |
159 | |
160 | ret = regmap_bulk_write(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs, |
161 | TIME_NUM); |
162 | if (ret < 0) |
163 | return ret; |
164 | |
165 | if (alrm->enabled) |
166 | ret = regmap_update_bits(rtc->regmap, MAX8907_REG_ALARM0_CNTL, |
167 | 0x7f, 0x7f); |
168 | |
169 | return ret; |
170 | } |
171 | |
172 | static const struct rtc_class_ops max8907_rtc_ops = { |
173 | .read_time = max8907_rtc_read_time, |
174 | .set_time = max8907_rtc_set_time, |
175 | .read_alarm = max8907_rtc_read_alarm, |
176 | .set_alarm = max8907_rtc_set_alarm, |
177 | }; |
178 | |
179 | static int max8907_rtc_probe(struct platform_device *pdev) |
180 | { |
181 | struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent); |
182 | struct max8907_rtc *rtc; |
183 | int ret; |
184 | |
185 | rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); |
186 | if (!rtc) |
187 | return -ENOMEM; |
188 | platform_set_drvdata(pdev, rtc); |
189 | |
190 | rtc->max8907 = max8907; |
191 | rtc->regmap = max8907->regmap_rtc; |
192 | |
193 | rtc->rtc_dev = rtc_device_register("max8907-rtc", &pdev->dev, |
194 | &max8907_rtc_ops, THIS_MODULE); |
195 | if (IS_ERR(rtc->rtc_dev)) { |
196 | ret = PTR_ERR(rtc->rtc_dev); |
197 | dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); |
198 | return ret; |
199 | } |
200 | |
201 | rtc->irq = regmap_irq_get_virq(max8907->irqc_rtc, |
202 | MAX8907_IRQ_RTC_ALARM0); |
203 | if (rtc->irq < 0) { |
204 | ret = rtc->irq; |
205 | goto err_unregister; |
206 | } |
207 | |
208 | ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL, |
209 | max8907_irq_handler, |
210 | IRQF_ONESHOT, "max8907-alarm0", rtc); |
211 | if (ret < 0) { |
212 | dev_err(&pdev->dev, "Failed to request IRQ%d: %d\n", |
213 | rtc->irq, ret); |
214 | goto err_unregister; |
215 | } |
216 | |
217 | return 0; |
218 | |
219 | err_unregister: |
220 | rtc_device_unregister(rtc->rtc_dev); |
221 | return ret; |
222 | } |
223 | |
224 | static int max8907_rtc_remove(struct platform_device *pdev) |
225 | { |
226 | struct max8907_rtc *rtc = platform_get_drvdata(pdev); |
227 | |
228 | rtc_device_unregister(rtc->rtc_dev); |
229 | |
230 | return 0; |
231 | } |
232 | |
233 | static struct platform_driver max8907_rtc_driver = { |
234 | .driver = { |
235 | .name = "max8907-rtc", |
236 | .owner = THIS_MODULE, |
237 | }, |
238 | .probe = max8907_rtc_probe, |
239 | .remove = max8907_rtc_remove, |
240 | }; |
241 | module_platform_driver(max8907_rtc_driver); |
242 | |
243 | MODULE_DESCRIPTION("Maxim MAX8907 RTC driver"); |
244 | MODULE_LICENSE("GPL v2"); |
245 |
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