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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
25struct da9052_rtc {
26 struct rtc_device *rtc;
27 struct da9052 *da9052;
28 int irq;
29};
30
31static 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
49static 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
69static 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
92static 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
123static 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
136static 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
164static 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
181static 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
197static 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
216static 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
223static 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
231static int da9052_rtc_probe(struct platform_device *pdev)
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);
248 return ret;
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
260err_free_irq:
261 free_irq(rtc->irq, rtc);
262 return ret;
263}
264
265static int da9052_rtc_remove(struct platform_device *pdev)
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);
272
273 return 0;
274}
275
276static struct platform_driver da9052_rtc_driver = {
277 .probe = da9052_rtc_probe,
278 .remove = da9052_rtc_remove,
279 .driver = {
280 .name = "da9052-rtc",
281 .owner = THIS_MODULE,
282 },
283};
284
285module_platform_driver(da9052_rtc_driver);
286
287MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
288MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC");
289MODULE_LICENSE("GPL");
290MODULE_ALIAS("platform:da9052-rtc");
291
