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fef931ff AJ |
1 | /* |
2 | * Real time clock driver for DA9052 | |
3 | * | |
4 | * Copyright(c) 2012 Dialog Semiconductor Ltd. | |
5 | * | |
6 | * Author: Dajun Dajun Chen <dajun.chen@diasemi.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/rtc.h> | |
11f54d05 | 18 | #include <linux/err.h> |
fef931ff AJ |
19 | |
20 | #include <linux/mfd/da9052/da9052.h> | |
21 | #include <linux/mfd/da9052/reg.h> | |
22 | ||
23 | #define rtc_err(da9052, fmt, ...) \ | |
24 | dev_err(da9052->dev, "%s: " fmt, __func__, ##__VA_ARGS__) | |
25 | ||
26 | struct da9052_rtc { | |
27 | struct rtc_device *rtc; | |
28 | struct da9052 *da9052; | |
29 | int irq; | |
30 | }; | |
31 | ||
32 | static int da9052_rtc_enable_alarm(struct da9052 *da9052, bool enable) | |
33 | { | |
34 | int ret; | |
35 | if (enable) { | |
36 | ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG, | |
37 | DA9052_ALARM_Y_ALARM_ON, | |
38 | DA9052_ALARM_Y_ALARM_ON); | |
39 | if (ret != 0) | |
40 | rtc_err(da9052, "Failed to enable ALM: %d\n", ret); | |
41 | } else { | |
42 | ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG, | |
43 | DA9052_ALARM_Y_ALARM_ON, 0); | |
44 | if (ret != 0) | |
45 | rtc_err(da9052, "Write error: %d\n", ret); | |
46 | } | |
47 | return ret; | |
48 | } | |
49 | ||
50 | static irqreturn_t da9052_rtc_irq(int irq, void *data) | |
51 | { | |
52 | struct da9052_rtc *rtc = data; | |
53 | int ret; | |
54 | ||
55 | ret = da9052_reg_read(rtc->da9052, DA9052_ALARM_MI_REG); | |
56 | if (ret < 0) { | |
57 | rtc_err(rtc->da9052, "Read error: %d\n", ret); | |
58 | return IRQ_NONE; | |
59 | } | |
60 | ||
61 | if (ret & DA9052_ALARMMI_ALARMTYPE) { | |
62 | da9052_rtc_enable_alarm(rtc->da9052, 0); | |
63 | rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF); | |
64 | } else | |
65 | rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_PF); | |
66 | ||
67 | return IRQ_HANDLED; | |
68 | } | |
69 | ||
70 | static int da9052_read_alarm(struct da9052 *da9052, struct rtc_time *rtc_tm) | |
71 | { | |
72 | int ret; | |
73 | uint8_t v[5]; | |
74 | ||
75 | ret = da9052_group_read(da9052, DA9052_ALARM_MI_REG, 5, v); | |
76 | if (ret != 0) { | |
77 | rtc_err(da9052, "Failed to group read ALM: %d\n", ret); | |
78 | return ret; | |
79 | } | |
80 | ||
81 | rtc_tm->tm_year = (v[4] & DA9052_RTC_YEAR) + 100; | |
82 | rtc_tm->tm_mon = (v[3] & DA9052_RTC_MONTH) - 1; | |
83 | rtc_tm->tm_mday = v[2] & DA9052_RTC_DAY; | |
84 | rtc_tm->tm_hour = v[1] & DA9052_RTC_HOUR; | |
85 | rtc_tm->tm_min = v[0] & DA9052_RTC_MIN; | |
86 | ||
87 | ret = rtc_valid_tm(rtc_tm); | |
88 | if (ret != 0) | |
89 | return ret; | |
90 | return ret; | |
91 | } | |
92 | ||
93 | static int da9052_set_alarm(struct da9052 *da9052, struct rtc_time *rtc_tm) | |
94 | { | |
95 | int ret; | |
96 | uint8_t v[3]; | |
97 | ||
98 | rtc_tm->tm_year -= 100; | |
99 | rtc_tm->tm_mon += 1; | |
100 | ||
101 | ret = da9052_reg_update(da9052, DA9052_ALARM_MI_REG, | |
102 | DA9052_RTC_MIN, rtc_tm->tm_min); | |
103 | if (ret != 0) { | |
104 | rtc_err(da9052, "Failed to write ALRM MIN: %d\n", ret); | |
105 | return ret; | |
106 | } | |
107 | ||
108 | v[0] = rtc_tm->tm_hour; | |
109 | v[1] = rtc_tm->tm_mday; | |
110 | v[2] = rtc_tm->tm_mon; | |
111 | ||
112 | ret = da9052_group_write(da9052, DA9052_ALARM_H_REG, 3, v); | |
113 | if (ret < 0) | |
114 | return ret; | |
115 | ||
116 | ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG, | |
117 | DA9052_RTC_YEAR, rtc_tm->tm_year); | |
118 | if (ret != 0) | |
119 | rtc_err(da9052, "Failed to write ALRM YEAR: %d\n", ret); | |
120 | ||
121 | return ret; | |
122 | } | |
123 | ||
124 | static int da9052_rtc_get_alarm_status(struct da9052 *da9052) | |
125 | { | |
126 | int ret; | |
127 | ||
128 | ret = da9052_reg_read(da9052, DA9052_ALARM_Y_REG); | |
129 | if (ret < 0) { | |
130 | rtc_err(da9052, "Failed to read ALM: %d\n", ret); | |
131 | return ret; | |
132 | } | |
133 | ret &= DA9052_ALARM_Y_ALARM_ON; | |
134 | return (ret > 0) ? 1 : 0; | |
135 | } | |
136 | ||
137 | static int da9052_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm) | |
138 | { | |
139 | struct da9052_rtc *rtc = dev_get_drvdata(dev); | |
140 | uint8_t v[6]; | |
141 | int ret; | |
142 | ||
143 | ret = da9052_group_read(rtc->da9052, DA9052_COUNT_S_REG, 6, v); | |
144 | if (ret < 0) { | |
145 | rtc_err(rtc->da9052, "Failed to read RTC time : %d\n", ret); | |
146 | return ret; | |
147 | } | |
148 | ||
149 | rtc_tm->tm_year = (v[5] & DA9052_RTC_YEAR) + 100; | |
150 | rtc_tm->tm_mon = (v[4] & DA9052_RTC_MONTH) - 1; | |
151 | rtc_tm->tm_mday = v[3] & DA9052_RTC_DAY; | |
152 | rtc_tm->tm_hour = v[2] & DA9052_RTC_HOUR; | |
153 | rtc_tm->tm_min = v[1] & DA9052_RTC_MIN; | |
154 | rtc_tm->tm_sec = v[0] & DA9052_RTC_SEC; | |
155 | ||
156 | ret = rtc_valid_tm(rtc_tm); | |
157 | if (ret != 0) { | |
158 | rtc_err(rtc->da9052, "rtc_valid_tm failed: %d\n", ret); | |
159 | return ret; | |
160 | } | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | static int da9052_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
166 | { | |
167 | struct da9052_rtc *rtc; | |
168 | uint8_t v[6]; | |
169 | ||
170 | rtc = dev_get_drvdata(dev); | |
171 | ||
172 | v[0] = tm->tm_sec; | |
173 | v[1] = tm->tm_min; | |
174 | v[2] = tm->tm_hour; | |
175 | v[3] = tm->tm_mday; | |
176 | v[4] = tm->tm_mon + 1; | |
177 | v[5] = tm->tm_year - 100; | |
178 | ||
179 | return da9052_group_write(rtc->da9052, DA9052_COUNT_S_REG, 6, v); | |
180 | } | |
181 | ||
182 | static int da9052_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
183 | { | |
184 | int ret; | |
185 | struct rtc_time *tm = &alrm->time; | |
186 | struct da9052_rtc *rtc = dev_get_drvdata(dev); | |
187 | ||
188 | ret = da9052_read_alarm(rtc->da9052, tm); | |
189 | ||
190 | if (ret) | |
191 | return ret; | |
192 | ||
193 | alrm->enabled = da9052_rtc_get_alarm_status(rtc->da9052); | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static int da9052_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
199 | { | |
200 | int ret; | |
201 | struct rtc_time *tm = &alrm->time; | |
202 | struct da9052_rtc *rtc = dev_get_drvdata(dev); | |
203 | ||
204 | ret = da9052_rtc_enable_alarm(rtc->da9052, 0); | |
205 | if (ret < 0) | |
206 | return ret; | |
207 | ||
208 | ret = da9052_set_alarm(rtc->da9052, tm); | |
209 | if (ret) | |
210 | return ret; | |
211 | ||
212 | ret = da9052_rtc_enable_alarm(rtc->da9052, 1); | |
213 | ||
214 | return ret; | |
215 | } | |
216 | ||
217 | static int da9052_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
218 | { | |
219 | struct da9052_rtc *rtc = dev_get_drvdata(dev); | |
220 | ||
221 | return da9052_rtc_enable_alarm(rtc->da9052, enabled); | |
222 | } | |
223 | ||
224 | static const struct rtc_class_ops da9052_rtc_ops = { | |
225 | .read_time = da9052_rtc_read_time, | |
226 | .set_time = da9052_rtc_set_time, | |
227 | .read_alarm = da9052_rtc_read_alarm, | |
228 | .set_alarm = da9052_rtc_set_alarm, | |
229 | .alarm_irq_enable = da9052_rtc_alarm_irq_enable, | |
230 | }; | |
231 | ||
5a167f45 | 232 | static int da9052_rtc_probe(struct platform_device *pdev) |
fef931ff AJ |
233 | { |
234 | struct da9052_rtc *rtc; | |
235 | int ret; | |
236 | ||
237 | rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9052_rtc), GFP_KERNEL); | |
238 | if (!rtc) | |
239 | return -ENOMEM; | |
240 | ||
241 | rtc->da9052 = dev_get_drvdata(pdev->dev.parent); | |
242 | platform_set_drvdata(pdev, rtc); | |
925e8ea6 AJ |
243 | rtc->irq = DA9052_IRQ_ALARM; |
244 | ret = da9052_request_irq(rtc->da9052, rtc->irq, "ALM", | |
245 | da9052_rtc_irq, rtc); | |
fef931ff AJ |
246 | if (ret != 0) { |
247 | rtc_err(rtc->da9052, "irq registration failed: %d\n", ret); | |
007def04 | 248 | return ret; |
fef931ff AJ |
249 | } |
250 | ||
3689cd74 | 251 | rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, |
fef931ff | 252 | &da9052_rtc_ops, THIS_MODULE); |
dac30a98 | 253 | return PTR_ERR_OR_ZERO(rtc->rtc); |
fef931ff AJ |
254 | } |
255 | ||
fef931ff AJ |
256 | static struct platform_driver da9052_rtc_driver = { |
257 | .probe = da9052_rtc_probe, | |
fef931ff AJ |
258 | .driver = { |
259 | .name = "da9052-rtc", | |
260 | .owner = THIS_MODULE, | |
261 | }, | |
262 | }; | |
263 | ||
264 | module_platform_driver(da9052_rtc_driver); | |
265 | ||
266 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
267 | MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC"); | |
268 | MODULE_LICENSE("GPL"); | |
269 | MODULE_ALIAS("platform:da9052-rtc"); |