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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Real time clock driver for DA9052
4 *
5 * Copyright(c) 2012 Dialog Semiconductor Ltd.
6 *
7 * Author: Dajun Dajun Chen <dajun.chen@diasemi.com>
8 */
9
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/rtc.h>
13#include <linux/err.h>
14#include <linux/delay.h>
15
16#include <linux/mfd/da9052/da9052.h>
17#include <linux/mfd/da9052/reg.h>
18
19#define rtc_err(rtc, fmt, ...) \
20 dev_err(rtc->da9052->dev, "%s: " fmt, __func__, ##__VA_ARGS__)
21
22#define DA9052_GET_TIME_RETRIES 5
23
24struct da9052_rtc {
25 struct rtc_device *rtc;
26 struct da9052 *da9052;
27};
28
29static int da9052_rtc_enable_alarm(struct da9052_rtc *rtc, bool enable)
30{
31 int ret;
32 if (enable) {
33 ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
34 DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON,
35 DA9052_ALARM_Y_ALARM_ON);
36 if (ret != 0)
37 rtc_err(rtc, "Failed to enable ALM: %d\n", ret);
38 } else {
39 ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
40 DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON, 0);
41 if (ret != 0)
42 rtc_err(rtc, "Write error: %d\n", ret);
43 }
44 return ret;
45}
46
47static irqreturn_t da9052_rtc_irq(int irq, void *data)
48{
49 struct da9052_rtc *rtc = data;
50
51 rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
52
53 return IRQ_HANDLED;
54}
55
56static int da9052_read_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm)
57{
58 int ret;
59 uint8_t v[2][5];
60 int idx = 1;
61 int timeout = DA9052_GET_TIME_RETRIES;
62
63 ret = da9052_group_read(rtc->da9052, DA9052_ALARM_MI_REG, 5, &v[0][0]);
64 if (ret) {
65 rtc_err(rtc, "Failed to group read ALM: %d\n", ret);
66 return ret;
67 }
68
69 do {
70 ret = da9052_group_read(rtc->da9052,
71 DA9052_ALARM_MI_REG, 5, &v[idx][0]);
72 if (ret) {
73 rtc_err(rtc, "Failed to group read ALM: %d\n", ret);
74 return ret;
75 }
76
77 if (memcmp(&v[0][0], &v[1][0], 5) == 0) {
78 rtc_tm->tm_year = (v[0][4] & DA9052_RTC_YEAR) + 100;
79 rtc_tm->tm_mon = (v[0][3] & DA9052_RTC_MONTH) - 1;
80 rtc_tm->tm_mday = v[0][2] & DA9052_RTC_DAY;
81 rtc_tm->tm_hour = v[0][1] & DA9052_RTC_HOUR;
82 rtc_tm->tm_min = v[0][0] & DA9052_RTC_MIN;
83 rtc_tm->tm_sec = 0;
84
85 ret = rtc_valid_tm(rtc_tm);
86 return ret;
87 }
88
89 idx = (1-idx);
90 msleep(20);
91
92 } while (timeout--);
93
94 rtc_err(rtc, "Timed out reading alarm time\n");
95
96 return -EIO;
97}
98
99static int da9052_set_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm)
100{
101 struct da9052 *da9052 = rtc->da9052;
102 unsigned long alm_time;
103 int ret;
104 uint8_t v[3];
105
106 alm_time = rtc_tm_to_time64(rtc_tm);
107
108 if (rtc_tm->tm_sec > 0) {
109 alm_time += 60 - rtc_tm->tm_sec;
110 rtc_time64_to_tm(alm_time, rtc_tm);
111 }
112 BUG_ON(rtc_tm->tm_sec); /* it will cause repeated irqs if not zero */
113
114 rtc_tm->tm_year -= 100;
115 rtc_tm->tm_mon += 1;
116
117 ret = da9052_reg_update(da9052, DA9052_ALARM_MI_REG,
118 DA9052_RTC_MIN, rtc_tm->tm_min);
119 if (ret != 0) {
120 rtc_err(rtc, "Failed to write ALRM MIN: %d\n", ret);
121 return ret;
122 }
123
124 v[0] = rtc_tm->tm_hour;
125 v[1] = rtc_tm->tm_mday;
126 v[2] = rtc_tm->tm_mon;
127
128 ret = da9052_group_write(da9052, DA9052_ALARM_H_REG, 3, v);
129 if (ret < 0)
130 return ret;
131
132 ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG,
133 DA9052_RTC_YEAR, rtc_tm->tm_year);
134 if (ret != 0)
135 rtc_err(rtc, "Failed to write ALRM YEAR: %d\n", ret);
136
137 return ret;
138}
139
140static int da9052_rtc_get_alarm_status(struct da9052_rtc *rtc)
141{
142 int ret;
143
144 ret = da9052_reg_read(rtc->da9052, DA9052_ALARM_Y_REG);
145 if (ret < 0) {
146 rtc_err(rtc, "Failed to read ALM: %d\n", ret);
147 return ret;
148 }
149
150 return !!(ret&DA9052_ALARM_Y_ALARM_ON);
151}
152
153static int da9052_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
154{
155 struct da9052_rtc *rtc = dev_get_drvdata(dev);
156 int ret;
157 uint8_t v[2][6];
158 int idx = 1;
159 int timeout = DA9052_GET_TIME_RETRIES;
160
161 ret = da9052_group_read(rtc->da9052, DA9052_COUNT_S_REG, 6, &v[0][0]);
162 if (ret) {
163 rtc_err(rtc, "Failed to read RTC time : %d\n", ret);
164 return ret;
165 }
166
167 do {
168 ret = da9052_group_read(rtc->da9052,
169 DA9052_COUNT_S_REG, 6, &v[idx][0]);
170 if (ret) {
171 rtc_err(rtc, "Failed to read RTC time : %d\n", ret);
172 return ret;
173 }
174
175 if (memcmp(&v[0][0], &v[1][0], 6) == 0) {
176 rtc_tm->tm_year = (v[0][5] & DA9052_RTC_YEAR) + 100;
177 rtc_tm->tm_mon = (v[0][4] & DA9052_RTC_MONTH) - 1;
178 rtc_tm->tm_mday = v[0][3] & DA9052_RTC_DAY;
179 rtc_tm->tm_hour = v[0][2] & DA9052_RTC_HOUR;
180 rtc_tm->tm_min = v[0][1] & DA9052_RTC_MIN;
181 rtc_tm->tm_sec = v[0][0] & DA9052_RTC_SEC;
182
183 return 0;
184 }
185
186 idx = (1-idx);
187 msleep(20);
188
189 } while (timeout--);
190
191 rtc_err(rtc, "Timed out reading time\n");
192
193 return -EIO;
194}
195
196static int da9052_rtc_set_time(struct device *dev, struct rtc_time *tm)
197{
198 struct da9052_rtc *rtc;
199 uint8_t v[6];
200 int ret;
201
202 /* DA9052 only has 6 bits for year - to represent 2000-2063 */
203 if ((tm->tm_year < 100) || (tm->tm_year > 163))
204 return -EINVAL;
205
206 rtc = dev_get_drvdata(dev);
207
208 v[0] = tm->tm_sec;
209 v[1] = tm->tm_min;
210 v[2] = tm->tm_hour;
211 v[3] = tm->tm_mday;
212 v[4] = tm->tm_mon + 1;
213 v[5] = tm->tm_year - 100;
214
215 ret = da9052_group_write(rtc->da9052, DA9052_COUNT_S_REG, 6, v);
216 if (ret < 0)
217 rtc_err(rtc, "failed to set RTC time: %d\n", ret);
218 return ret;
219}
220
221static int da9052_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
222{
223 int ret;
224 struct rtc_time *tm = &alrm->time;
225 struct da9052_rtc *rtc = dev_get_drvdata(dev);
226
227 ret = da9052_read_alarm(rtc, tm);
228 if (ret < 0) {
229 rtc_err(rtc, "failed to read RTC alarm: %d\n", ret);
230 return ret;
231 }
232
233 alrm->enabled = da9052_rtc_get_alarm_status(rtc);
234 return 0;
235}
236
237static int da9052_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
238{
239 int ret;
240 struct rtc_time *tm = &alrm->time;
241 struct da9052_rtc *rtc = dev_get_drvdata(dev);
242
243 /* DA9052 only has 6 bits for year - to represent 2000-2063 */
244 if ((tm->tm_year < 100) || (tm->tm_year > 163))
245 return -EINVAL;
246
247 ret = da9052_rtc_enable_alarm(rtc, 0);
248 if (ret < 0)
249 return ret;
250
251 ret = da9052_set_alarm(rtc, tm);
252 if (ret < 0)
253 return ret;
254
255 ret = da9052_rtc_enable_alarm(rtc, 1);
256 return ret;
257}
258
259static int da9052_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
260{
261 struct da9052_rtc *rtc = dev_get_drvdata(dev);
262
263 return da9052_rtc_enable_alarm(rtc, enabled);
264}
265
266static const struct rtc_class_ops da9052_rtc_ops = {
267 .read_time = da9052_rtc_read_time,
268 .set_time = da9052_rtc_set_time,
269 .read_alarm = da9052_rtc_read_alarm,
270 .set_alarm = da9052_rtc_set_alarm,
271 .alarm_irq_enable = da9052_rtc_alarm_irq_enable,
272};
273
274static int da9052_rtc_probe(struct platform_device *pdev)
275{
276 struct da9052_rtc *rtc;
277 int ret;
278
279 rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9052_rtc), GFP_KERNEL);
280 if (!rtc)
281 return -ENOMEM;
282
283 rtc->da9052 = dev_get_drvdata(pdev->dev.parent);
284 platform_set_drvdata(pdev, rtc);
285
286 ret = da9052_reg_write(rtc->da9052, DA9052_BBAT_CONT_REG, 0xFE);
287 if (ret < 0) {
288 rtc_err(rtc,
289 "Failed to setup RTC battery charging: %d\n", ret);
290 return ret;
291 }
292
293 ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
294 DA9052_ALARM_Y_TICK_ON, 0);
295 if (ret != 0)
296 rtc_err(rtc, "Failed to disable TICKS: %d\n", ret);
297
298 device_init_wakeup(&pdev->dev, true);
299 rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
300 if (IS_ERR(rtc->rtc))
301 return PTR_ERR(rtc->rtc);
302
303 rtc->rtc->ops = &da9052_rtc_ops;
304 rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
305 rtc->rtc->range_max = RTC_TIMESTAMP_END_2063;
306
307 ret = devm_rtc_register_device(rtc->rtc);
308 if (ret)
309 return ret;
310
311 ret = da9052_request_irq(rtc->da9052, DA9052_IRQ_ALARM, "ALM",
312 da9052_rtc_irq, rtc);
313 if (ret != 0) {
314 rtc_err(rtc, "irq registration failed: %d\n", ret);
315 return ret;
316 }
317
318 return 0;
319}
320
321static struct platform_driver da9052_rtc_driver = {
322 .probe = da9052_rtc_probe,
323 .driver = {
324 .name = "da9052-rtc",
325 },
326};
327
328module_platform_driver(da9052_rtc_driver);
329
330MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>");
331MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC");
332MODULE_LICENSE("GPL");
333MODULE_ALIAS("platform:da9052-rtc");
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
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 __devinit 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 goto err_mem;
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);
262err_mem:
263 devm_kfree(&pdev->dev, rtc);
264 return ret;
265}
266
267static int __devexit da9052_rtc_remove(struct platform_device *pdev)
268{
269 struct da9052_rtc *rtc = pdev->dev.platform_data;
270
271 rtc_device_unregister(rtc->rtc);
272 free_irq(rtc->irq, rtc);
273 platform_set_drvdata(pdev, NULL);
274 devm_kfree(&pdev->dev, rtc);
275
276 return 0;
277}
278
279static struct platform_driver da9052_rtc_driver = {
280 .probe = da9052_rtc_probe,
281 .remove = __devexit_p(da9052_rtc_remove),
282 .driver = {
283 .name = "da9052-rtc",
284 .owner = THIS_MODULE,
285 },
286};
287
288module_platform_driver(da9052_rtc_driver);
289
290MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
291MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC");
292MODULE_LICENSE("GPL");
293MODULE_ALIAS("platform:da9052-rtc");