summaryrefslogtreecommitdiffstats
path: root/drivers/rtc/rtc-da9055.c
blob: 8f0dcfedb83cdfb9c613083574e8e591826beaf5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
/*
 * Real time clock driver for DA9055
 *
 * Copyright(c) 2012 Dialog Semiconductor Ltd.
 *
 * Author: Dajun Dajun Chen <dajun.chen@diasemi.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>

#include <linux/mfd/da9055/core.h>
#include <linux/mfd/da9055/reg.h>
#include <linux/mfd/da9055/pdata.h>

struct da9055_rtc {
	struct rtc_device *rtc;
	struct da9055 *da9055;
	int alarm_enable;
};

static int da9055_rtc_enable_alarm(struct da9055_rtc *rtc, bool enable)
{
	int ret;
	if (enable) {
		ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,
					DA9055_RTC_ALM_EN,
					DA9055_RTC_ALM_EN);
		if (ret != 0)
			dev_err(rtc->da9055->dev, "Failed to enable ALM: %d\n",
				ret);
		rtc->alarm_enable = 1;
	} else {
		ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,
					DA9055_RTC_ALM_EN, 0);
		if (ret != 0)
			dev_err(rtc->da9055->dev,
				"Failed to disable ALM: %d\n", ret);
		rtc->alarm_enable = 0;
	}
	return ret;
}

static irqreturn_t da9055_rtc_alm_irq(int irq, void *data)
{
	struct da9055_rtc *rtc = data;

	da9055_rtc_enable_alarm(rtc, 0);
	rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);

	return IRQ_HANDLED;
}

static int da9055_read_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm)
{
	int ret;
	uint8_t v[5];

	ret = da9055_group_read(da9055, DA9055_REG_ALARM_MI, 5, v);
	if (ret != 0) {
		dev_err(da9055->dev, "Failed to group read ALM: %d\n", ret);
		return ret;
	}

	rtc_tm->tm_year = (v[4] & DA9055_RTC_ALM_YEAR) + 100;
	rtc_tm->tm_mon  = (v[3] & DA9055_RTC_ALM_MONTH) - 1;
	rtc_tm->tm_mday = v[2] & DA9055_RTC_ALM_DAY;
	rtc_tm->tm_hour = v[1] & DA9055_RTC_ALM_HOUR;
	rtc_tm->tm_min  = v[0] & DA9055_RTC_ALM_MIN;

	return rtc_valid_tm(rtc_tm);
}

static int da9055_set_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm)
{
	int ret;
	uint8_t v[2];

	rtc_tm->tm_year -= 100;
	rtc_tm->tm_mon += 1;

	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MI,
				DA9055_RTC_ALM_MIN, rtc_tm->tm_min);
	if (ret != 0) {
		dev_err(da9055->dev, "Failed to write ALRM MIN: %d\n", ret);
		return ret;
	}

	v[0] = rtc_tm->tm_hour;
	v[1] = rtc_tm->tm_mday;

	ret = da9055_group_write(da9055, DA9055_REG_ALARM_H, 2, v);
	if (ret < 0)
		return ret;

	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,
				DA9055_RTC_ALM_MONTH, rtc_tm->tm_mon);
	if (ret < 0)
		dev_err(da9055->dev, "Failed to write ALM Month:%d\n", ret);

	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_Y,
				DA9055_RTC_ALM_YEAR, rtc_tm->tm_year);
	if (ret < 0)
		dev_err(da9055->dev, "Failed to write ALM Year:%d\n", ret);

	return ret;
}

static int da9055_rtc_get_alarm_status(struct da9055 *da9055)
{
	int ret;

	ret = da9055_reg_read(da9055, DA9055_REG_ALARM_Y);
	if (ret < 0) {
		dev_err(da9055->dev, "Failed to read ALM: %d\n", ret);
		return ret;
	}
	ret &= DA9055_RTC_ALM_EN;
	return (ret > 0) ? 1 : 0;
}

static int da9055_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
{
	struct da9055_rtc *rtc = dev_get_drvdata(dev);
	uint8_t v[6];
	int ret;

	ret = da9055_reg_read(rtc->da9055, DA9055_REG_COUNT_S);
	if (ret < 0)
		return ret;

	/*
	 * Registers are only valid when RTC_READ
	 * status bit is asserted
	 */
	if (!(ret & DA9055_RTC_READ))
		return -EBUSY;

	ret = da9055_group_read(rtc->da9055, DA9055_REG_COUNT_S, 6, v);
	if (ret < 0) {
		dev_err(rtc->da9055->dev, "Failed to read RTC time : %d\n",
			ret);
		return ret;
	}

	rtc_tm->tm_year = (v[5] & DA9055_RTC_YEAR) + 100;
	rtc_tm->tm_mon  = (v[4] & DA9055_RTC_MONTH) - 1;
	rtc_tm->tm_mday = v[3] & DA9055_RTC_DAY;
	rtc_tm->tm_hour = v[2] & DA9055_RTC_HOUR;
	rtc_tm->tm_min  = v[1] & DA9055_RTC_MIN;
	rtc_tm->tm_sec  = v[0] & DA9055_RTC_SEC;

	return rtc_valid_tm(rtc_tm);
}

static int da9055_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct da9055_rtc *rtc;
	uint8_t v[6];

	rtc = dev_get_drvdata(dev);

	v[0] = tm->tm_sec;
	v[1] = tm->tm_min;
	v[2] = tm->tm_hour;
	v[3] = tm->tm_mday;
	v[4] = tm->tm_mon + 1;
	v[5] = tm->tm_year - 100;

	return da9055_group_write(rtc->da9055, DA9055_REG_COUNT_S, 6, v);
}

static int da9055_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	int ret;
	struct rtc_time *tm = &alrm->time;
	struct da9055_rtc *rtc = dev_get_drvdata(dev);

	ret = da9055_read_alarm(rtc->da9055, tm);

	if (ret)
		return ret;

	alrm->enabled = da9055_rtc_get_alarm_status(rtc->da9055);

	return 0;
}

static int da9055_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	int ret;
	struct rtc_time *tm = &alrm->time;
	struct da9055_rtc *rtc = dev_get_drvdata(dev);

	ret = da9055_rtc_enable_alarm(rtc, 0);
	if (ret < 0)
		return ret;

	ret = da9055_set_alarm(rtc->da9055, tm);
	if (ret)
		return ret;

	ret = da9055_rtc_enable_alarm(rtc, 1);

	return ret;
}

static int da9055_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
	struct da9055_rtc *rtc = dev_get_drvdata(dev);

	return da9055_rtc_enable_alarm(rtc, enabled);
}

static const struct rtc_class_ops da9055_rtc_ops = {
	.read_time	= da9055_rtc_read_time,
	.set_time	= da9055_rtc_set_time,
	.read_alarm	= da9055_rtc_read_alarm,
	.set_alarm	= da9055_rtc_set_alarm,
	.alarm_irq_enable = da9055_rtc_alarm_irq_enable,
};

static int da9055_rtc_device_init(struct da9055 *da9055,
					struct da9055_pdata *pdata)
{
	int ret;

	/* Enable RTC and the internal Crystal */
	ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
				DA9055_RTC_EN, DA9055_RTC_EN);
	if (ret < 0)
		return ret;
	ret = da9055_reg_update(da9055, DA9055_REG_EN_32K,
				DA9055_CRYSTAL_EN, DA9055_CRYSTAL_EN);
	if (ret < 0)
		return ret;

	/* Enable RTC in Power Down mode */
	ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
				DA9055_RTC_MODE_PD, DA9055_RTC_MODE_PD);
	if (ret < 0)
		return ret;

	/* Enable RTC in Reset mode */
	if (pdata && pdata->reset_enable) {
		ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
					DA9055_RTC_MODE_SD,
					DA9055_RTC_MODE_SD <<
					DA9055_RTC_MODE_SD_SHIFT);
		if (ret < 0)
			return ret;
	}

	/* Disable the RTC TICK ALM */
	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,
				DA9055_RTC_TICK_WAKE_MASK, 0);
	if (ret < 0)
		return ret;

	return 0;
}

static int da9055_rtc_probe(struct platform_device *pdev)
{
	struct da9055_rtc *rtc;
	struct da9055_pdata *pdata = NULL;
	int ret, alm_irq;

	rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9055_rtc), GFP_KERNEL);
	if (!rtc)
		return -ENOMEM;

	rtc->da9055 = dev_get_drvdata(pdev->dev.parent);
	pdata = rtc->da9055->dev->platform_data;
	platform_set_drvdata(pdev, rtc);

	ret = da9055_rtc_device_init(rtc->da9055, pdata);
	if (ret < 0)
		goto err_rtc;

	ret = da9055_reg_read(rtc->da9055, DA9055_REG_ALARM_Y);
	if (ret < 0)
		goto err_rtc;

	if (ret & DA9055_RTC_ALM_EN)
		rtc->alarm_enable = 1;

	device_init_wakeup(&pdev->dev, 1);

	rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
					&da9055_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc->rtc)) {
		ret = PTR_ERR(rtc->rtc);
		goto err_rtc;
	}

	alm_irq = platform_get_irq_byname(pdev, "ALM");
	alm_irq = regmap_irq_get_virq(rtc->da9055->irq_data, alm_irq);
	ret = devm_request_threaded_irq(&pdev->dev, alm_irq, NULL,
					da9055_rtc_alm_irq,
					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
					"ALM", rtc);
	if (ret != 0)
		dev_err(rtc->da9055->dev, "irq registration failed: %d\n", ret);

err_rtc:
	return ret;

}

static int da9055_rtc_remove(struct platform_device *pdev)
{
	struct da9055_rtc *rtc = pdev->dev.platform_data;

	rtc_device_unregister(rtc->rtc);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

#ifdef CONFIG_PM
/* Turn off the alarm if it should not be a wake source. */
static int da9055_rtc_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
	int ret;

	if (!device_may_wakeup(&pdev->dev)) {
		/* Disable the ALM IRQ */
		ret = da9055_rtc_enable_alarm(rtc, 0);
		if (ret < 0)
			dev_err(&pdev->dev, "Failed to disable RTC ALM\n");
	}

	return 0;
}

/* Enable the alarm if it should be enabled (in case it was disabled to
 * prevent use as a wake source).
 */
static int da9055_rtc_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
	int ret;

	if (!device_may_wakeup(&pdev->dev)) {
		if (rtc->alarm_enable) {
			ret = da9055_rtc_enable_alarm(rtc, 1);
			if (ret < 0)
				dev_err(&pdev->dev,
					"Failed to restart RTC ALM\n");
		}
	}

	return 0;
}

/* Unconditionally disable the alarm */
static int da9055_rtc_freeze(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
	int ret;

	ret = da9055_rtc_enable_alarm(rtc, 0);
	if (ret < 0)
		dev_err(&pdev->dev, "Failed to freeze RTC ALMs\n");

	return 0;

}
#else
#define da9055_rtc_suspend NULL
#define da9055_rtc_resume NULL
#define da9055_rtc_freeze NULL
#endif

static const struct dev_pm_ops da9055_rtc_pm_ops = {
	.suspend = da9055_rtc_suspend,
	.resume = da9055_rtc_resume,

	.freeze = da9055_rtc_freeze,
	.thaw = da9055_rtc_resume,
	.restore = da9055_rtc_resume,

	.poweroff = da9055_rtc_suspend,
};

static struct platform_driver da9055_rtc_driver = {
	.probe  = da9055_rtc_probe,
	.remove = da9055_rtc_remove,
	.driver = {
		.name   = "da9055-rtc",
		.owner  = THIS_MODULE,
		.pm = &da9055_rtc_pm_ops,
	},
};

module_platform_driver(da9055_rtc_driver);

MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("RTC driver for Dialog DA9055 PMIC");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9055-rtc");