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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
eae854b2 BR |
2 | /* NXP PCF50633 RTC Driver |
3 | * | |
4 | * (C) 2006-2008 by Openmoko, Inc. | |
5 | * Author: Balaji Rao <balajirrao@openmoko.org> | |
6 | * All rights reserved. | |
7 | * | |
8 | * Broken down from monstrous PCF50633 driver mainly by | |
9 | * Harald Welte, Andy Green and Werner Almesberger | |
eae854b2 BR |
10 | */ |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/device.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
eae854b2 BR |
17 | #include <linux/platform_device.h> |
18 | #include <linux/rtc.h> | |
19 | #include <linux/bcd.h> | |
20 | #include <linux/err.h> | |
21 | ||
22 | #include <linux/mfd/pcf50633/core.h> | |
23 | ||
24 | #define PCF50633_REG_RTCSC 0x59 /* Second */ | |
25 | #define PCF50633_REG_RTCMN 0x5a /* Minute */ | |
26 | #define PCF50633_REG_RTCHR 0x5b /* Hour */ | |
27 | #define PCF50633_REG_RTCWD 0x5c /* Weekday */ | |
28 | #define PCF50633_REG_RTCDT 0x5d /* Day */ | |
29 | #define PCF50633_REG_RTCMT 0x5e /* Month */ | |
30 | #define PCF50633_REG_RTCYR 0x5f /* Year */ | |
31 | #define PCF50633_REG_RTCSCA 0x60 /* Alarm Second */ | |
32 | #define PCF50633_REG_RTCMNA 0x61 /* Alarm Minute */ | |
33 | #define PCF50633_REG_RTCHRA 0x62 /* Alarm Hour */ | |
34 | #define PCF50633_REG_RTCWDA 0x63 /* Alarm Weekday */ | |
35 | #define PCF50633_REG_RTCDTA 0x64 /* Alarm Day */ | |
36 | #define PCF50633_REG_RTCMTA 0x65 /* Alarm Month */ | |
37 | #define PCF50633_REG_RTCYRA 0x66 /* Alarm Year */ | |
38 | ||
39 | enum pcf50633_time_indexes { | |
40 | PCF50633_TI_SEC, | |
41 | PCF50633_TI_MIN, | |
42 | PCF50633_TI_HOUR, | |
43 | PCF50633_TI_WKDAY, | |
44 | PCF50633_TI_DAY, | |
45 | PCF50633_TI_MONTH, | |
46 | PCF50633_TI_YEAR, | |
47 | PCF50633_TI_EXTENT /* always last */ | |
48 | }; | |
49 | ||
50 | struct pcf50633_time { | |
51 | u_int8_t time[PCF50633_TI_EXTENT]; | |
52 | }; | |
53 | ||
54 | struct pcf50633_rtc { | |
55 | int alarm_enabled; | |
a766ae3e | 56 | int alarm_pending; |
eae854b2 BR |
57 | |
58 | struct pcf50633 *pcf; | |
59 | struct rtc_device *rtc_dev; | |
60 | }; | |
61 | ||
62 | static void pcf2rtc_time(struct rtc_time *rtc, struct pcf50633_time *pcf) | |
63 | { | |
64 | rtc->tm_sec = bcd2bin(pcf->time[PCF50633_TI_SEC]); | |
65 | rtc->tm_min = bcd2bin(pcf->time[PCF50633_TI_MIN]); | |
66 | rtc->tm_hour = bcd2bin(pcf->time[PCF50633_TI_HOUR]); | |
67 | rtc->tm_wday = bcd2bin(pcf->time[PCF50633_TI_WKDAY]); | |
68 | rtc->tm_mday = bcd2bin(pcf->time[PCF50633_TI_DAY]); | |
265f2a05 | 69 | rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]) - 1; |
eae854b2 BR |
70 | rtc->tm_year = bcd2bin(pcf->time[PCF50633_TI_YEAR]) + 100; |
71 | } | |
72 | ||
73 | static void rtc2pcf_time(struct pcf50633_time *pcf, struct rtc_time *rtc) | |
74 | { | |
75 | pcf->time[PCF50633_TI_SEC] = bin2bcd(rtc->tm_sec); | |
76 | pcf->time[PCF50633_TI_MIN] = bin2bcd(rtc->tm_min); | |
77 | pcf->time[PCF50633_TI_HOUR] = bin2bcd(rtc->tm_hour); | |
78 | pcf->time[PCF50633_TI_WKDAY] = bin2bcd(rtc->tm_wday); | |
79 | pcf->time[PCF50633_TI_DAY] = bin2bcd(rtc->tm_mday); | |
265f2a05 | 80 | pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon + 1); |
eae854b2 BR |
81 | pcf->time[PCF50633_TI_YEAR] = bin2bcd(rtc->tm_year % 100); |
82 | } | |
83 | ||
84 | static int | |
85 | pcf50633_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
86 | { | |
87 | struct pcf50633_rtc *rtc = dev_get_drvdata(dev); | |
88 | int err; | |
89 | ||
90 | if (enabled) | |
91 | err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM); | |
92 | else | |
93 | err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM); | |
94 | ||
95 | if (err < 0) | |
96 | return err; | |
97 | ||
98 | rtc->alarm_enabled = enabled; | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
eae854b2 BR |
103 | static int pcf50633_rtc_read_time(struct device *dev, struct rtc_time *tm) |
104 | { | |
105 | struct pcf50633_rtc *rtc; | |
106 | struct pcf50633_time pcf_tm; | |
107 | int ret; | |
108 | ||
109 | rtc = dev_get_drvdata(dev); | |
110 | ||
111 | ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSC, | |
112 | PCF50633_TI_EXTENT, | |
113 | &pcf_tm.time[0]); | |
114 | if (ret != PCF50633_TI_EXTENT) { | |
115 | dev_err(dev, "Failed to read time\n"); | |
116 | return -EIO; | |
117 | } | |
118 | ||
119 | dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n", | |
120 | pcf_tm.time[PCF50633_TI_DAY], | |
121 | pcf_tm.time[PCF50633_TI_MONTH], | |
122 | pcf_tm.time[PCF50633_TI_YEAR], | |
123 | pcf_tm.time[PCF50633_TI_HOUR], | |
124 | pcf_tm.time[PCF50633_TI_MIN], | |
125 | pcf_tm.time[PCF50633_TI_SEC]); | |
126 | ||
127 | pcf2rtc_time(tm, &pcf_tm); | |
128 | ||
8d2e6b22 | 129 | dev_dbg(dev, "RTC_TIME: %ptRr\n", tm); |
eae854b2 | 130 | |
22652ba7 | 131 | return 0; |
eae854b2 BR |
132 | } |
133 | ||
134 | static int pcf50633_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
135 | { | |
136 | struct pcf50633_rtc *rtc; | |
137 | struct pcf50633_time pcf_tm; | |
3d62b8f5 | 138 | int alarm_masked, ret = 0; |
eae854b2 BR |
139 | |
140 | rtc = dev_get_drvdata(dev); | |
141 | ||
8d2e6b22 | 142 | dev_dbg(dev, "RTC_TIME: %ptRr\n", tm); |
eae854b2 BR |
143 | |
144 | rtc2pcf_time(&pcf_tm, tm); | |
145 | ||
146 | dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n", | |
147 | pcf_tm.time[PCF50633_TI_DAY], | |
148 | pcf_tm.time[PCF50633_TI_MONTH], | |
149 | pcf_tm.time[PCF50633_TI_YEAR], | |
150 | pcf_tm.time[PCF50633_TI_HOUR], | |
151 | pcf_tm.time[PCF50633_TI_MIN], | |
152 | pcf_tm.time[PCF50633_TI_SEC]); | |
153 | ||
154 | ||
eae854b2 BR |
155 | alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM); |
156 | ||
eae854b2 BR |
157 | if (!alarm_masked) |
158 | pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM); | |
159 | ||
160 | /* Returns 0 on success */ | |
161 | ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSC, | |
162 | PCF50633_TI_EXTENT, | |
163 | &pcf_tm.time[0]); | |
164 | ||
eae854b2 BR |
165 | if (!alarm_masked) |
166 | pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM); | |
167 | ||
168 | return ret; | |
169 | } | |
170 | ||
171 | static int pcf50633_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
172 | { | |
173 | struct pcf50633_rtc *rtc; | |
174 | struct pcf50633_time pcf_tm; | |
175 | int ret = 0; | |
176 | ||
177 | rtc = dev_get_drvdata(dev); | |
178 | ||
179 | alrm->enabled = rtc->alarm_enabled; | |
a766ae3e | 180 | alrm->pending = rtc->alarm_pending; |
eae854b2 BR |
181 | |
182 | ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSCA, | |
183 | PCF50633_TI_EXTENT, &pcf_tm.time[0]); | |
184 | if (ret != PCF50633_TI_EXTENT) { | |
185 | dev_err(dev, "Failed to read time\n"); | |
186 | return -EIO; | |
187 | } | |
188 | ||
189 | pcf2rtc_time(&alrm->time, &pcf_tm); | |
190 | ||
191 | return rtc_valid_tm(&alrm->time); | |
192 | } | |
193 | ||
194 | static int pcf50633_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
195 | { | |
196 | struct pcf50633_rtc *rtc; | |
197 | struct pcf50633_time pcf_tm; | |
198 | int alarm_masked, ret = 0; | |
199 | ||
200 | rtc = dev_get_drvdata(dev); | |
201 | ||
202 | rtc2pcf_time(&pcf_tm, &alrm->time); | |
203 | ||
204 | /* do like mktime does and ignore tm_wday */ | |
205 | pcf_tm.time[PCF50633_TI_WKDAY] = 7; | |
206 | ||
207 | alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM); | |
208 | ||
209 | /* disable alarm interrupt */ | |
210 | if (!alarm_masked) | |
211 | pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM); | |
212 | ||
213 | /* Returns 0 on success */ | |
214 | ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSCA, | |
215 | PCF50633_TI_EXTENT, &pcf_tm.time[0]); | |
a766ae3e WA |
216 | if (!alrm->enabled) |
217 | rtc->alarm_pending = 0; | |
eae854b2 | 218 | |
05f45d7d | 219 | if (!alarm_masked || alrm->enabled) |
eae854b2 | 220 | pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM); |
05f45d7d | 221 | rtc->alarm_enabled = alrm->enabled; |
eae854b2 BR |
222 | |
223 | return ret; | |
224 | } | |
225 | ||
34c7b3ac | 226 | static const struct rtc_class_ops pcf50633_rtc_ops = { |
eae854b2 BR |
227 | .read_time = pcf50633_rtc_read_time, |
228 | .set_time = pcf50633_rtc_set_time, | |
229 | .read_alarm = pcf50633_rtc_read_alarm, | |
230 | .set_alarm = pcf50633_rtc_set_alarm, | |
51ba60c5 | 231 | .alarm_irq_enable = pcf50633_rtc_alarm_irq_enable, |
eae854b2 BR |
232 | }; |
233 | ||
234 | static void pcf50633_rtc_irq(int irq, void *data) | |
235 | { | |
236 | struct pcf50633_rtc *rtc = data; | |
237 | ||
3d62b8f5 LPC |
238 | rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF); |
239 | rtc->alarm_pending = 1; | |
eae854b2 BR |
240 | } |
241 | ||
5a167f45 | 242 | static int pcf50633_rtc_probe(struct platform_device *pdev) |
eae854b2 | 243 | { |
eae854b2 BR |
244 | struct pcf50633_rtc *rtc; |
245 | ||
76753caf | 246 | rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); |
eae854b2 BR |
247 | if (!rtc) |
248 | return -ENOMEM; | |
249 | ||
68d641ef | 250 | rtc->pcf = dev_to_pcf50633(pdev->dev.parent); |
eae854b2 | 251 | platform_set_drvdata(pdev, rtc); |
76753caf | 252 | rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "pcf50633-rtc", |
eae854b2 BR |
253 | &pcf50633_rtc_ops, THIS_MODULE); |
254 | ||
76753caf JH |
255 | if (IS_ERR(rtc->rtc_dev)) |
256 | return PTR_ERR(rtc->rtc_dev); | |
eae854b2 BR |
257 | |
258 | pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_ALARM, | |
259 | pcf50633_rtc_irq, rtc); | |
eae854b2 BR |
260 | return 0; |
261 | } | |
262 | ||
5a167f45 | 263 | static int pcf50633_rtc_remove(struct platform_device *pdev) |
eae854b2 BR |
264 | { |
265 | struct pcf50633_rtc *rtc; | |
266 | ||
267 | rtc = platform_get_drvdata(pdev); | |
eae854b2 | 268 | pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_ALARM); |
eae854b2 | 269 | |
eae854b2 BR |
270 | return 0; |
271 | } | |
272 | ||
273 | static struct platform_driver pcf50633_rtc_driver = { | |
274 | .driver = { | |
275 | .name = "pcf50633-rtc", | |
276 | }, | |
277 | .probe = pcf50633_rtc_probe, | |
5a167f45 | 278 | .remove = pcf50633_rtc_remove, |
eae854b2 BR |
279 | }; |
280 | ||
0c4eae66 | 281 | module_platform_driver(pcf50633_rtc_driver); |
eae854b2 BR |
282 | |
283 | MODULE_DESCRIPTION("PCF50633 RTC driver"); | |
284 | MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>"); | |
285 | MODULE_LICENSE("GPL"); | |
286 |