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1/*
2 * Real time clock driver for DA9055
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/da9055/core.h>
20#include <linux/mfd/da9055/reg.h>
21#include <linux/mfd/da9055/pdata.h>
22
23struct da9055_rtc {
24 struct rtc_device *rtc;
25 struct da9055 *da9055;
26 int alarm_enable;
27};
28
29static int da9055_rtc_enable_alarm(struct da9055_rtc *rtc, bool enable)
30{
31 int ret;
32 if (enable) {
33 ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,
34 DA9055_RTC_ALM_EN,
35 DA9055_RTC_ALM_EN);
36 if (ret != 0)
37 dev_err(rtc->da9055->dev, "Failed to enable ALM: %d\n",
38 ret);
39 rtc->alarm_enable = 1;
40 } else {
41 ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,
42 DA9055_RTC_ALM_EN, 0);
43 if (ret != 0)
44 dev_err(rtc->da9055->dev,
45 "Failed to disable ALM: %d\n", ret);
46 rtc->alarm_enable = 0;
47 }
48 return ret;
49}
50
51static irqreturn_t da9055_rtc_alm_irq(int irq, void *data)
52{
53 struct da9055_rtc *rtc = data;
54
55 da9055_rtc_enable_alarm(rtc, 0);
56 rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
57
58 return IRQ_HANDLED;
59}
60
61static int da9055_read_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm)
62{
63 int ret;
64 uint8_t v[5];
65
66 ret = da9055_group_read(da9055, DA9055_REG_ALARM_MI, 5, v);
67 if (ret != 0) {
68 dev_err(da9055->dev, "Failed to group read ALM: %d\n", ret);
69 return ret;
70 }
71
72 rtc_tm->tm_year = (v[4] & DA9055_RTC_ALM_YEAR) + 100;
73 rtc_tm->tm_mon = (v[3] & DA9055_RTC_ALM_MONTH) - 1;
74 rtc_tm->tm_mday = v[2] & DA9055_RTC_ALM_DAY;
75 rtc_tm->tm_hour = v[1] & DA9055_RTC_ALM_HOUR;
76 rtc_tm->tm_min = v[0] & DA9055_RTC_ALM_MIN;
77
78 return rtc_valid_tm(rtc_tm);
79}
80
81static int da9055_set_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm)
82{
83 int ret;
84 uint8_t v[2];
85
86 rtc_tm->tm_year -= 100;
87 rtc_tm->tm_mon += 1;
88
89 ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MI,
90 DA9055_RTC_ALM_MIN, rtc_tm->tm_min);
91 if (ret != 0) {
92 dev_err(da9055->dev, "Failed to write ALRM MIN: %d\n", ret);
93 return ret;
94 }
95
96 v[0] = rtc_tm->tm_hour;
97 v[1] = rtc_tm->tm_mday;
98
99 ret = da9055_group_write(da9055, DA9055_REG_ALARM_H, 2, v);
100 if (ret < 0)
101 return ret;
102
103 ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,
104 DA9055_RTC_ALM_MONTH, rtc_tm->tm_mon);
105 if (ret < 0)
106 dev_err(da9055->dev, "Failed to write ALM Month:%d\n", ret);
107
108 ret = da9055_reg_update(da9055, DA9055_REG_ALARM_Y,
109 DA9055_RTC_ALM_YEAR, rtc_tm->tm_year);
110 if (ret < 0)
111 dev_err(da9055->dev, "Failed to write ALM Year:%d\n", ret);
112
113 return ret;
114}
115
116static int da9055_rtc_get_alarm_status(struct da9055 *da9055)
117{
118 int ret;
119
120 ret = da9055_reg_read(da9055, DA9055_REG_ALARM_Y);
121 if (ret < 0) {
122 dev_err(da9055->dev, "Failed to read ALM: %d\n", ret);
123 return ret;
124 }
125 ret &= DA9055_RTC_ALM_EN;
126 return (ret > 0) ? 1 : 0;
127}
128
129static int da9055_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
130{
131 struct da9055_rtc *rtc = dev_get_drvdata(dev);
132 uint8_t v[6];
133 int ret;
134
135 ret = da9055_reg_read(rtc->da9055, DA9055_REG_COUNT_S);
136 if (ret < 0)
137 return ret;
138
139 /*
140 * Registers are only valid when RTC_READ
141 * status bit is asserted
142 */
143 if (!(ret & DA9055_RTC_READ))
144 return -EBUSY;
145
146 ret = da9055_group_read(rtc->da9055, DA9055_REG_COUNT_S, 6, v);
147 if (ret < 0) {
148 dev_err(rtc->da9055->dev, "Failed to read RTC time : %d\n",
149 ret);
150 return ret;
151 }
152
153 rtc_tm->tm_year = (v[5] & DA9055_RTC_YEAR) + 100;
154 rtc_tm->tm_mon = (v[4] & DA9055_RTC_MONTH) - 1;
155 rtc_tm->tm_mday = v[3] & DA9055_RTC_DAY;
156 rtc_tm->tm_hour = v[2] & DA9055_RTC_HOUR;
157 rtc_tm->tm_min = v[1] & DA9055_RTC_MIN;
158 rtc_tm->tm_sec = v[0] & DA9055_RTC_SEC;
159
160 return rtc_valid_tm(rtc_tm);
161}
162
163static int da9055_rtc_set_time(struct device *dev, struct rtc_time *tm)
164{
165 struct da9055_rtc *rtc;
166 uint8_t v[6];
167
168 rtc = dev_get_drvdata(dev);
169
170 v[0] = tm->tm_sec;
171 v[1] = tm->tm_min;
172 v[2] = tm->tm_hour;
173 v[3] = tm->tm_mday;
174 v[4] = tm->tm_mon + 1;
175 v[5] = tm->tm_year - 100;
176
177 return da9055_group_write(rtc->da9055, DA9055_REG_COUNT_S, 6, v);
178}
179
180static int da9055_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
181{
182 int ret;
183 struct rtc_time *tm = &alrm->time;
184 struct da9055_rtc *rtc = dev_get_drvdata(dev);
185
186 ret = da9055_read_alarm(rtc->da9055, tm);
187
188 if (ret)
189 return ret;
190
191 alrm->enabled = da9055_rtc_get_alarm_status(rtc->da9055);
192
193 return 0;
194}
195
196static int da9055_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
197{
198 int ret;
199 struct rtc_time *tm = &alrm->time;
200 struct da9055_rtc *rtc = dev_get_drvdata(dev);
201
202 ret = da9055_rtc_enable_alarm(rtc, 0);
203 if (ret < 0)
204 return ret;
205
206 ret = da9055_set_alarm(rtc->da9055, tm);
207 if (ret)
208 return ret;
209
210 ret = da9055_rtc_enable_alarm(rtc, 1);
211
212 return ret;
213}
214
215static int da9055_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
216{
217 struct da9055_rtc *rtc = dev_get_drvdata(dev);
218
219 return da9055_rtc_enable_alarm(rtc, enabled);
220}
221
222static const struct rtc_class_ops da9055_rtc_ops = {
223 .read_time = da9055_rtc_read_time,
224 .set_time = da9055_rtc_set_time,
225 .read_alarm = da9055_rtc_read_alarm,
226 .set_alarm = da9055_rtc_set_alarm,
227 .alarm_irq_enable = da9055_rtc_alarm_irq_enable,
228};
229
230static int da9055_rtc_device_init(struct da9055 *da9055,
231 struct da9055_pdata *pdata)
232{
233 int ret;
234
235 /* Enable RTC and the internal Crystal */
236 ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
237 DA9055_RTC_EN, DA9055_RTC_EN);
238 if (ret < 0)
239 return ret;
240 ret = da9055_reg_update(da9055, DA9055_REG_EN_32K,
241 DA9055_CRYSTAL_EN, DA9055_CRYSTAL_EN);
242 if (ret < 0)
243 return ret;
244
245 /* Enable RTC in Power Down mode */
246 ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
247 DA9055_RTC_MODE_PD, DA9055_RTC_MODE_PD);
248 if (ret < 0)
249 return ret;
250
251 /* Enable RTC in Reset mode */
252 if (pdata && pdata->reset_enable) {
253 ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
254 DA9055_RTC_MODE_SD,
255 DA9055_RTC_MODE_SD <<
256 DA9055_RTC_MODE_SD_SHIFT);
257 if (ret < 0)
258 return ret;
259 }
260
261 /* Disable the RTC TICK ALM */
262 ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,
263 DA9055_RTC_TICK_WAKE_MASK, 0);
264 if (ret < 0)
265 return ret;
266
267 return 0;
268}
269
270static int da9055_rtc_probe(struct platform_device *pdev)
271{
272 struct da9055_rtc *rtc;
273 struct da9055_pdata *pdata = NULL;
274 int ret, alm_irq;
275
276 rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9055_rtc), GFP_KERNEL);
277 if (!rtc)
278 return -ENOMEM;
279
280 rtc->da9055 = dev_get_drvdata(pdev->dev.parent);
281 pdata = dev_get_platdata(rtc->da9055->dev);
282 platform_set_drvdata(pdev, rtc);
283
284 ret = da9055_rtc_device_init(rtc->da9055, pdata);
285 if (ret < 0)
286 goto err_rtc;
287
288 ret = da9055_reg_read(rtc->da9055, DA9055_REG_ALARM_Y);
289 if (ret < 0)
290 goto err_rtc;
291
292 if (ret & DA9055_RTC_ALM_EN)
293 rtc->alarm_enable = 1;
294
295 device_init_wakeup(&pdev->dev, 1);
296
297 rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
298 &da9055_rtc_ops, THIS_MODULE);
299 if (IS_ERR(rtc->rtc)) {
300 ret = PTR_ERR(rtc->rtc);
301 goto err_rtc;
302 }
303
304 alm_irq = platform_get_irq_byname(pdev, "ALM");
305 if (alm_irq < 0)
306 return alm_irq;
307
308 ret = devm_request_threaded_irq(&pdev->dev, alm_irq, NULL,
309 da9055_rtc_alm_irq,
310 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
311 "ALM", rtc);
312 if (ret != 0)
313 dev_err(rtc->da9055->dev, "irq registration failed: %d\n", ret);
314
315err_rtc:
316 return ret;
317
318}
319
320#ifdef CONFIG_PM
321/* Turn off the alarm if it should not be a wake source. */
322static int da9055_rtc_suspend(struct device *dev)
323{
324 struct platform_device *pdev = to_platform_device(dev);
325 struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
326 int ret;
327
328 if (!device_may_wakeup(&pdev->dev)) {
329 /* Disable the ALM IRQ */
330 ret = da9055_rtc_enable_alarm(rtc, 0);
331 if (ret < 0)
332 dev_err(&pdev->dev, "Failed to disable RTC ALM\n");
333 }
334
335 return 0;
336}
337
338/* Enable the alarm if it should be enabled (in case it was disabled to
339 * prevent use as a wake source).
340 */
341static int da9055_rtc_resume(struct device *dev)
342{
343 struct platform_device *pdev = to_platform_device(dev);
344 struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
345 int ret;
346
347 if (!device_may_wakeup(&pdev->dev)) {
348 if (rtc->alarm_enable) {
349 ret = da9055_rtc_enable_alarm(rtc, 1);
350 if (ret < 0)
351 dev_err(&pdev->dev,
352 "Failed to restart RTC ALM\n");
353 }
354 }
355
356 return 0;
357}
358
359/* Unconditionally disable the alarm */
360static int da9055_rtc_freeze(struct device *dev)
361{
362 struct platform_device *pdev = to_platform_device(dev);
363 struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
364 int ret;
365
366 ret = da9055_rtc_enable_alarm(rtc, 0);
367 if (ret < 0)
368 dev_err(&pdev->dev, "Failed to freeze RTC ALMs\n");
369
370 return 0;
371
372}
373#else
374#define da9055_rtc_suspend NULL
375#define da9055_rtc_resume NULL
376#define da9055_rtc_freeze NULL
377#endif
378
379static const struct dev_pm_ops da9055_rtc_pm_ops = {
380 .suspend = da9055_rtc_suspend,
381 .resume = da9055_rtc_resume,
382
383 .freeze = da9055_rtc_freeze,
384 .thaw = da9055_rtc_resume,
385 .restore = da9055_rtc_resume,
386
387 .poweroff = da9055_rtc_suspend,
388};
389
390static struct platform_driver da9055_rtc_driver = {
391 .probe = da9055_rtc_probe,
392 .driver = {
393 .name = "da9055-rtc",
394 .pm = &da9055_rtc_pm_ops,
395 },
396};
397
398module_platform_driver(da9055_rtc_driver);
399
400MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
401MODULE_DESCRIPTION("RTC driver for Dialog DA9055 PMIC");
402MODULE_LICENSE("GPL");
403MODULE_ALIAS("platform:da9055-rtc");
1/*
2 * Real time clock driver for DA9055
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/da9055/core.h>
20#include <linux/mfd/da9055/reg.h>
21#include <linux/mfd/da9055/pdata.h>
22
23struct da9055_rtc {
24 struct rtc_device *rtc;
25 struct da9055 *da9055;
26 int alarm_enable;
27};
28
29static int da9055_rtc_enable_alarm(struct da9055_rtc *rtc, bool enable)
30{
31 int ret;
32 if (enable) {
33 ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,
34 DA9055_RTC_ALM_EN,
35 DA9055_RTC_ALM_EN);
36 if (ret != 0)
37 dev_err(rtc->da9055->dev, "Failed to enable ALM: %d\n",
38 ret);
39 rtc->alarm_enable = 1;
40 } else {
41 ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,
42 DA9055_RTC_ALM_EN, 0);
43 if (ret != 0)
44 dev_err(rtc->da9055->dev,
45 "Failed to disable ALM: %d\n", ret);
46 rtc->alarm_enable = 0;
47 }
48 return ret;
49}
50
51static irqreturn_t da9055_rtc_alm_irq(int irq, void *data)
52{
53 struct da9055_rtc *rtc = data;
54
55 da9055_rtc_enable_alarm(rtc, 0);
56 rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
57
58 return IRQ_HANDLED;
59}
60
61static int da9055_read_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm)
62{
63 int ret;
64 uint8_t v[5];
65
66 ret = da9055_group_read(da9055, DA9055_REG_ALARM_MI, 5, v);
67 if (ret != 0) {
68 dev_err(da9055->dev, "Failed to group read ALM: %d\n", ret);
69 return ret;
70 }
71
72 rtc_tm->tm_year = (v[4] & DA9055_RTC_ALM_YEAR) + 100;
73 rtc_tm->tm_mon = (v[3] & DA9055_RTC_ALM_MONTH) - 1;
74 rtc_tm->tm_mday = v[2] & DA9055_RTC_ALM_DAY;
75 rtc_tm->tm_hour = v[1] & DA9055_RTC_ALM_HOUR;
76 rtc_tm->tm_min = v[0] & DA9055_RTC_ALM_MIN;
77 rtc_tm->tm_sec = 0;
78
79 return rtc_valid_tm(rtc_tm);
80}
81
82static int da9055_set_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm)
83{
84 int ret;
85 uint8_t v[2];
86
87 rtc_tm->tm_year -= 100;
88 rtc_tm->tm_mon += 1;
89
90 ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MI,
91 DA9055_RTC_ALM_MIN, rtc_tm->tm_min);
92 if (ret != 0) {
93 dev_err(da9055->dev, "Failed to write ALRM MIN: %d\n", ret);
94 return ret;
95 }
96
97 v[0] = rtc_tm->tm_hour;
98 v[1] = rtc_tm->tm_mday;
99
100 ret = da9055_group_write(da9055, DA9055_REG_ALARM_H, 2, v);
101 if (ret < 0)
102 return ret;
103
104 ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,
105 DA9055_RTC_ALM_MONTH, rtc_tm->tm_mon);
106 if (ret < 0)
107 dev_err(da9055->dev, "Failed to write ALM Month:%d\n", ret);
108
109 ret = da9055_reg_update(da9055, DA9055_REG_ALARM_Y,
110 DA9055_RTC_ALM_YEAR, rtc_tm->tm_year);
111 if (ret < 0)
112 dev_err(da9055->dev, "Failed to write ALM Year:%d\n", ret);
113
114 return ret;
115}
116
117static int da9055_rtc_get_alarm_status(struct da9055 *da9055)
118{
119 int ret;
120
121 ret = da9055_reg_read(da9055, DA9055_REG_ALARM_Y);
122 if (ret < 0) {
123 dev_err(da9055->dev, "Failed to read ALM: %d\n", ret);
124 return ret;
125 }
126 ret &= DA9055_RTC_ALM_EN;
127 return (ret > 0) ? 1 : 0;
128}
129
130static int da9055_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
131{
132 struct da9055_rtc *rtc = dev_get_drvdata(dev);
133 uint8_t v[6];
134 int ret;
135
136 ret = da9055_reg_read(rtc->da9055, DA9055_REG_COUNT_S);
137 if (ret < 0)
138 return ret;
139
140 /*
141 * Registers are only valid when RTC_READ
142 * status bit is asserted
143 */
144 if (!(ret & DA9055_RTC_READ))
145 return -EBUSY;
146
147 ret = da9055_group_read(rtc->da9055, DA9055_REG_COUNT_S, 6, v);
148 if (ret < 0) {
149 dev_err(rtc->da9055->dev, "Failed to read RTC time : %d\n",
150 ret);
151 return ret;
152 }
153
154 rtc_tm->tm_year = (v[5] & DA9055_RTC_YEAR) + 100;
155 rtc_tm->tm_mon = (v[4] & DA9055_RTC_MONTH) - 1;
156 rtc_tm->tm_mday = v[3] & DA9055_RTC_DAY;
157 rtc_tm->tm_hour = v[2] & DA9055_RTC_HOUR;
158 rtc_tm->tm_min = v[1] & DA9055_RTC_MIN;
159 rtc_tm->tm_sec = v[0] & DA9055_RTC_SEC;
160
161 return 0;
162}
163
164static int da9055_rtc_set_time(struct device *dev, struct rtc_time *tm)
165{
166 struct da9055_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 da9055_group_write(rtc->da9055, DA9055_REG_COUNT_S, 6, v);
179}
180
181static int da9055_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
182{
183 int ret;
184 struct rtc_time *tm = &alrm->time;
185 struct da9055_rtc *rtc = dev_get_drvdata(dev);
186
187 ret = da9055_read_alarm(rtc->da9055, tm);
188
189 if (ret)
190 return ret;
191
192 alrm->enabled = da9055_rtc_get_alarm_status(rtc->da9055);
193
194 return 0;
195}
196
197static int da9055_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
198{
199 int ret;
200 struct rtc_time *tm = &alrm->time;
201 struct da9055_rtc *rtc = dev_get_drvdata(dev);
202
203 ret = da9055_rtc_enable_alarm(rtc, 0);
204 if (ret < 0)
205 return ret;
206
207 ret = da9055_set_alarm(rtc->da9055, tm);
208 if (ret)
209 return ret;
210
211 ret = da9055_rtc_enable_alarm(rtc, 1);
212
213 return ret;
214}
215
216static int da9055_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
217{
218 struct da9055_rtc *rtc = dev_get_drvdata(dev);
219
220 return da9055_rtc_enable_alarm(rtc, enabled);
221}
222
223static const struct rtc_class_ops da9055_rtc_ops = {
224 .read_time = da9055_rtc_read_time,
225 .set_time = da9055_rtc_set_time,
226 .read_alarm = da9055_rtc_read_alarm,
227 .set_alarm = da9055_rtc_set_alarm,
228 .alarm_irq_enable = da9055_rtc_alarm_irq_enable,
229};
230
231static int da9055_rtc_device_init(struct da9055 *da9055,
232 struct da9055_pdata *pdata)
233{
234 int ret;
235
236 /* Enable RTC and the internal Crystal */
237 ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
238 DA9055_RTC_EN, DA9055_RTC_EN);
239 if (ret < 0)
240 return ret;
241 ret = da9055_reg_update(da9055, DA9055_REG_EN_32K,
242 DA9055_CRYSTAL_EN, DA9055_CRYSTAL_EN);
243 if (ret < 0)
244 return ret;
245
246 /* Enable RTC in Power Down mode */
247 ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
248 DA9055_RTC_MODE_PD, DA9055_RTC_MODE_PD);
249 if (ret < 0)
250 return ret;
251
252 /* Enable RTC in Reset mode */
253 if (pdata && pdata->reset_enable) {
254 ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
255 DA9055_RTC_MODE_SD,
256 DA9055_RTC_MODE_SD <<
257 DA9055_RTC_MODE_SD_SHIFT);
258 if (ret < 0)
259 return ret;
260 }
261
262 /* Disable the RTC TICK ALM */
263 ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,
264 DA9055_RTC_TICK_WAKE_MASK, 0);
265 if (ret < 0)
266 return ret;
267
268 return 0;
269}
270
271static int da9055_rtc_probe(struct platform_device *pdev)
272{
273 struct da9055_rtc *rtc;
274 struct da9055_pdata *pdata = NULL;
275 int ret, alm_irq;
276
277 rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9055_rtc), GFP_KERNEL);
278 if (!rtc)
279 return -ENOMEM;
280
281 rtc->da9055 = dev_get_drvdata(pdev->dev.parent);
282 pdata = dev_get_platdata(rtc->da9055->dev);
283 platform_set_drvdata(pdev, rtc);
284
285 ret = da9055_rtc_device_init(rtc->da9055, pdata);
286 if (ret < 0)
287 goto err_rtc;
288
289 ret = da9055_reg_read(rtc->da9055, DA9055_REG_ALARM_Y);
290 if (ret < 0)
291 goto err_rtc;
292
293 if (ret & DA9055_RTC_ALM_EN)
294 rtc->alarm_enable = 1;
295
296 device_init_wakeup(&pdev->dev, 1);
297
298 rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
299 &da9055_rtc_ops, THIS_MODULE);
300 if (IS_ERR(rtc->rtc)) {
301 ret = PTR_ERR(rtc->rtc);
302 goto err_rtc;
303 }
304
305 alm_irq = platform_get_irq_byname(pdev, "ALM");
306 if (alm_irq < 0)
307 return alm_irq;
308
309 ret = devm_request_threaded_irq(&pdev->dev, alm_irq, NULL,
310 da9055_rtc_alm_irq,
311 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
312 "ALM", rtc);
313 if (ret != 0)
314 dev_err(rtc->da9055->dev, "irq registration failed: %d\n", ret);
315
316err_rtc:
317 return ret;
318
319}
320
321#ifdef CONFIG_PM
322/* Turn off the alarm if it should not be a wake source. */
323static int da9055_rtc_suspend(struct device *dev)
324{
325 struct platform_device *pdev = to_platform_device(dev);
326 struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
327 int ret;
328
329 if (!device_may_wakeup(&pdev->dev)) {
330 /* Disable the ALM IRQ */
331 ret = da9055_rtc_enable_alarm(rtc, 0);
332 if (ret < 0)
333 dev_err(&pdev->dev, "Failed to disable RTC ALM\n");
334 }
335
336 return 0;
337}
338
339/* Enable the alarm if it should be enabled (in case it was disabled to
340 * prevent use as a wake source).
341 */
342static int da9055_rtc_resume(struct device *dev)
343{
344 struct platform_device *pdev = to_platform_device(dev);
345 struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
346 int ret;
347
348 if (!device_may_wakeup(&pdev->dev)) {
349 if (rtc->alarm_enable) {
350 ret = da9055_rtc_enable_alarm(rtc, 1);
351 if (ret < 0)
352 dev_err(&pdev->dev,
353 "Failed to restart RTC ALM\n");
354 }
355 }
356
357 return 0;
358}
359
360/* Unconditionally disable the alarm */
361static int da9055_rtc_freeze(struct device *dev)
362{
363 struct platform_device *pdev = to_platform_device(dev);
364 struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
365 int ret;
366
367 ret = da9055_rtc_enable_alarm(rtc, 0);
368 if (ret < 0)
369 dev_err(&pdev->dev, "Failed to freeze RTC ALMs\n");
370
371 return 0;
372
373}
374#else
375#define da9055_rtc_suspend NULL
376#define da9055_rtc_resume NULL
377#define da9055_rtc_freeze NULL
378#endif
379
380static const struct dev_pm_ops da9055_rtc_pm_ops = {
381 .suspend = da9055_rtc_suspend,
382 .resume = da9055_rtc_resume,
383
384 .freeze = da9055_rtc_freeze,
385 .thaw = da9055_rtc_resume,
386 .restore = da9055_rtc_resume,
387
388 .poweroff = da9055_rtc_suspend,
389};
390
391static struct platform_driver da9055_rtc_driver = {
392 .probe = da9055_rtc_probe,
393 .driver = {
394 .name = "da9055-rtc",
395 .pm = &da9055_rtc_pm_ops,
396 },
397};
398
399module_platform_driver(da9055_rtc_driver);
400
401MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
402MODULE_DESCRIPTION("RTC driver for Dialog DA9055 PMIC");
403MODULE_LICENSE("GPL");
404MODULE_ALIAS("platform:da9055-rtc");