Commit | Line | Data |
---|---|---|
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> | |
18 | ||
19 | #include <linux/mfd/da9052/da9052.h> | |
20 | #include <linux/mfd/da9052/reg.h> | |
21 | ||
22 | #define rtc_err(da9052, fmt, ...) \ | |
23 | dev_err(da9052->dev, "%s: " fmt, __func__, ##__VA_ARGS__) | |
24 | ||
25 | struct da9052_rtc { | |
26 | struct rtc_device *rtc; | |
27 | struct da9052 *da9052; | |
28 | int irq; | |
29 | }; | |
30 | ||
31 | static int da9052_rtc_enable_alarm(struct da9052 *da9052, bool enable) | |
32 | { | |
33 | int ret; | |
34 | if (enable) { | |
35 | ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG, | |
36 | DA9052_ALARM_Y_ALARM_ON, | |
37 | DA9052_ALARM_Y_ALARM_ON); | |
38 | if (ret != 0) | |
39 | rtc_err(da9052, "Failed to enable ALM: %d\n", ret); | |
40 | } else { | |
41 | ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG, | |
42 | DA9052_ALARM_Y_ALARM_ON, 0); | |
43 | if (ret != 0) | |
44 | rtc_err(da9052, "Write error: %d\n", ret); | |
45 | } | |
46 | return ret; | |
47 | } | |
48 | ||
49 | static irqreturn_t da9052_rtc_irq(int irq, void *data) | |
50 | { | |
51 | struct da9052_rtc *rtc = data; | |
52 | int ret; | |
53 | ||
54 | ret = da9052_reg_read(rtc->da9052, DA9052_ALARM_MI_REG); | |
55 | if (ret < 0) { | |
56 | rtc_err(rtc->da9052, "Read error: %d\n", ret); | |
57 | return IRQ_NONE; | |
58 | } | |
59 | ||
60 | if (ret & DA9052_ALARMMI_ALARMTYPE) { | |
61 | da9052_rtc_enable_alarm(rtc->da9052, 0); | |
62 | rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF); | |
63 | } else | |
64 | rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_PF); | |
65 | ||
66 | return IRQ_HANDLED; | |
67 | } | |
68 | ||
69 | static int da9052_read_alarm(struct da9052 *da9052, struct rtc_time *rtc_tm) | |
70 | { | |
71 | int ret; | |
72 | uint8_t v[5]; | |
73 | ||
74 | ret = da9052_group_read(da9052, DA9052_ALARM_MI_REG, 5, v); | |
75 | if (ret != 0) { | |
76 | rtc_err(da9052, "Failed to group read ALM: %d\n", ret); | |
77 | return ret; | |
78 | } | |
79 | ||
80 | rtc_tm->tm_year = (v[4] & DA9052_RTC_YEAR) + 100; | |
81 | rtc_tm->tm_mon = (v[3] & DA9052_RTC_MONTH) - 1; | |
82 | rtc_tm->tm_mday = v[2] & DA9052_RTC_DAY; | |
83 | rtc_tm->tm_hour = v[1] & DA9052_RTC_HOUR; | |
84 | rtc_tm->tm_min = v[0] & DA9052_RTC_MIN; | |
85 | ||
86 | ret = rtc_valid_tm(rtc_tm); | |
87 | if (ret != 0) | |
88 | return ret; | |
89 | return ret; | |
90 | } | |
91 | ||
92 | static int da9052_set_alarm(struct da9052 *da9052, struct rtc_time *rtc_tm) | |
93 | { | |
94 | int ret; | |
95 | uint8_t v[3]; | |
96 | ||
97 | rtc_tm->tm_year -= 100; | |
98 | rtc_tm->tm_mon += 1; | |
99 | ||
100 | ret = da9052_reg_update(da9052, DA9052_ALARM_MI_REG, | |
101 | DA9052_RTC_MIN, rtc_tm->tm_min); | |
102 | if (ret != 0) { | |
103 | rtc_err(da9052, "Failed to write ALRM MIN: %d\n", ret); | |
104 | return ret; | |
105 | } | |
106 | ||
107 | v[0] = rtc_tm->tm_hour; | |
108 | v[1] = rtc_tm->tm_mday; | |
109 | v[2] = rtc_tm->tm_mon; | |
110 | ||
111 | ret = da9052_group_write(da9052, DA9052_ALARM_H_REG, 3, v); | |
112 | if (ret < 0) | |
113 | return ret; | |
114 | ||
115 | ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG, | |
116 | DA9052_RTC_YEAR, rtc_tm->tm_year); | |
117 | if (ret != 0) | |
118 | rtc_err(da9052, "Failed to write ALRM YEAR: %d\n", ret); | |
119 | ||
120 | return ret; | |
121 | } | |
122 | ||
123 | static int da9052_rtc_get_alarm_status(struct da9052 *da9052) | |
124 | { | |
125 | int ret; | |
126 | ||
127 | ret = da9052_reg_read(da9052, DA9052_ALARM_Y_REG); | |
128 | if (ret < 0) { | |
129 | rtc_err(da9052, "Failed to read ALM: %d\n", ret); | |
130 | return ret; | |
131 | } | |
132 | ret &= DA9052_ALARM_Y_ALARM_ON; | |
133 | return (ret > 0) ? 1 : 0; | |
134 | } | |
135 | ||
136 | static int da9052_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm) | |
137 | { | |
138 | struct da9052_rtc *rtc = dev_get_drvdata(dev); | |
139 | uint8_t v[6]; | |
140 | int ret; | |
141 | ||
142 | ret = da9052_group_read(rtc->da9052, DA9052_COUNT_S_REG, 6, v); | |
143 | if (ret < 0) { | |
144 | rtc_err(rtc->da9052, "Failed to read RTC time : %d\n", ret); | |
145 | return ret; | |
146 | } | |
147 | ||
148 | rtc_tm->tm_year = (v[5] & DA9052_RTC_YEAR) + 100; | |
149 | rtc_tm->tm_mon = (v[4] & DA9052_RTC_MONTH) - 1; | |
150 | rtc_tm->tm_mday = v[3] & DA9052_RTC_DAY; | |
151 | rtc_tm->tm_hour = v[2] & DA9052_RTC_HOUR; | |
152 | rtc_tm->tm_min = v[1] & DA9052_RTC_MIN; | |
153 | rtc_tm->tm_sec = v[0] & DA9052_RTC_SEC; | |
154 | ||
155 | ret = rtc_valid_tm(rtc_tm); | |
156 | if (ret != 0) { | |
157 | rtc_err(rtc->da9052, "rtc_valid_tm failed: %d\n", ret); | |
158 | return ret; | |
159 | } | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | static int da9052_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
165 | { | |
166 | struct da9052_rtc *rtc; | |
167 | uint8_t v[6]; | |
168 | ||
169 | rtc = dev_get_drvdata(dev); | |
170 | ||
171 | v[0] = tm->tm_sec; | |
172 | v[1] = tm->tm_min; | |
173 | v[2] = tm->tm_hour; | |
174 | v[3] = tm->tm_mday; | |
175 | v[4] = tm->tm_mon + 1; | |
176 | v[5] = tm->tm_year - 100; | |
177 | ||
178 | return da9052_group_write(rtc->da9052, DA9052_COUNT_S_REG, 6, v); | |
179 | } | |
180 | ||
181 | static int da9052_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
182 | { | |
183 | int ret; | |
184 | struct rtc_time *tm = &alrm->time; | |
185 | struct da9052_rtc *rtc = dev_get_drvdata(dev); | |
186 | ||
187 | ret = da9052_read_alarm(rtc->da9052, tm); | |
188 | ||
189 | if (ret) | |
190 | return ret; | |
191 | ||
192 | alrm->enabled = da9052_rtc_get_alarm_status(rtc->da9052); | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | static int da9052_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
198 | { | |
199 | int ret; | |
200 | struct rtc_time *tm = &alrm->time; | |
201 | struct da9052_rtc *rtc = dev_get_drvdata(dev); | |
202 | ||
203 | ret = da9052_rtc_enable_alarm(rtc->da9052, 0); | |
204 | if (ret < 0) | |
205 | return ret; | |
206 | ||
207 | ret = da9052_set_alarm(rtc->da9052, tm); | |
208 | if (ret) | |
209 | return ret; | |
210 | ||
211 | ret = da9052_rtc_enable_alarm(rtc->da9052, 1); | |
212 | ||
213 | return ret; | |
214 | } | |
215 | ||
216 | static int da9052_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
217 | { | |
218 | struct da9052_rtc *rtc = dev_get_drvdata(dev); | |
219 | ||
220 | return da9052_rtc_enable_alarm(rtc->da9052, enabled); | |
221 | } | |
222 | ||
223 | static const struct rtc_class_ops da9052_rtc_ops = { | |
224 | .read_time = da9052_rtc_read_time, | |
225 | .set_time = da9052_rtc_set_time, | |
226 | .read_alarm = da9052_rtc_read_alarm, | |
227 | .set_alarm = da9052_rtc_set_alarm, | |
228 | .alarm_irq_enable = da9052_rtc_alarm_irq_enable, | |
229 | }; | |
230 | ||
5a167f45 | 231 | static int da9052_rtc_probe(struct platform_device *pdev) |
fef931ff AJ |
232 | { |
233 | struct da9052_rtc *rtc; | |
234 | int ret; | |
235 | ||
236 | rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9052_rtc), GFP_KERNEL); | |
237 | if (!rtc) | |
238 | return -ENOMEM; | |
239 | ||
240 | rtc->da9052 = dev_get_drvdata(pdev->dev.parent); | |
241 | platform_set_drvdata(pdev, rtc); | |
242 | rtc->irq = platform_get_irq_byname(pdev, "ALM"); | |
243 | ret = request_threaded_irq(rtc->irq, NULL, da9052_rtc_irq, | |
244 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
245 | "ALM", rtc); | |
246 | if (ret != 0) { | |
247 | rtc_err(rtc->da9052, "irq registration failed: %d\n", ret); | |
007def04 | 248 | return ret; |
fef931ff AJ |
249 | } |
250 | ||
251 | rtc->rtc = rtc_device_register(pdev->name, &pdev->dev, | |
252 | &da9052_rtc_ops, THIS_MODULE); | |
253 | if (IS_ERR(rtc->rtc)) { | |
254 | ret = PTR_ERR(rtc->rtc); | |
255 | goto err_free_irq; | |
256 | } | |
257 | ||
258 | return 0; | |
259 | ||
260 | err_free_irq: | |
261 | free_irq(rtc->irq, rtc); | |
fef931ff AJ |
262 | return ret; |
263 | } | |
264 | ||
5a167f45 | 265 | static int da9052_rtc_remove(struct platform_device *pdev) |
fef931ff AJ |
266 | { |
267 | struct da9052_rtc *rtc = pdev->dev.platform_data; | |
268 | ||
269 | rtc_device_unregister(rtc->rtc); | |
270 | free_irq(rtc->irq, rtc); | |
271 | platform_set_drvdata(pdev, NULL); | |
fef931ff AJ |
272 | |
273 | return 0; | |
274 | } | |
275 | ||
276 | static struct platform_driver da9052_rtc_driver = { | |
277 | .probe = da9052_rtc_probe, | |
5a167f45 | 278 | .remove = da9052_rtc_remove, |
fef931ff AJ |
279 | .driver = { |
280 | .name = "da9052-rtc", | |
281 | .owner = THIS_MODULE, | |
282 | }, | |
283 | }; | |
284 | ||
285 | module_platform_driver(da9052_rtc_driver); | |
286 | ||
287 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
288 | MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC"); | |
289 | MODULE_LICENSE("GPL"); | |
290 | MODULE_ALIAS("platform:da9052-rtc"); |