[net-next-2.6.git] / drivers / rtc / rtc-max8998.c

/*
 * RTC driver for Maxim MAX8998
 *
 * Copyright (C) 2010 Samsung Electronics Co.Ltd
 * Author: Minkyu Kang <mk7.kang@samsung.com>
 * Author: Joonyoung Shim <jy0922.shim@samsung.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/i2c.h>
#include <linux/slab.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <linux/mfd/max8998.h>
#include <linux/mfd/max8998-private.h>

#define MAX8998_RTC_SEC			0x00
#define MAX8998_RTC_MIN			0x01
#define MAX8998_RTC_HOUR		0x02
#define MAX8998_RTC_WEEKDAY		0x03
#define MAX8998_RTC_DATE		0x04
#define MAX8998_RTC_MONTH		0x05
#define MAX8998_RTC_YEAR1		0x06
#define MAX8998_RTC_YEAR2		0x07
#define MAX8998_ALARM0_SEC		0x08
#define MAX8998_ALARM0_MIN		0x09
#define MAX8998_ALARM0_HOUR		0x0a
#define MAX8998_ALARM0_WEEKDAY		0x0b
#define MAX8998_ALARM0_DATE		0x0c
#define MAX8998_ALARM0_MONTH		0x0d
#define MAX8998_ALARM0_YEAR1		0x0e
#define MAX8998_ALARM0_YEAR2		0x0f
#define MAX8998_ALARM1_SEC		0x10
#define MAX8998_ALARM1_MIN		0x11
#define MAX8998_ALARM1_HOUR		0x12
#define MAX8998_ALARM1_WEEKDAY		0x13
#define MAX8998_ALARM1_DATE		0x14
#define MAX8998_ALARM1_MONTH		0x15
#define MAX8998_ALARM1_YEAR1		0x16
#define MAX8998_ALARM1_YEAR2		0x17
#define MAX8998_ALARM0_CONF		0x18
#define MAX8998_ALARM1_CONF		0x19
#define MAX8998_RTC_STATUS		0x1a
#define MAX8998_WTSR_SMPL_CNTL		0x1b
#define MAX8998_TEST			0x1f

#define HOUR_12				(1 << 7)
#define HOUR_PM				(1 << 5)
#define ALARM0_STATUS			(1 << 1)
#define ALARM1_STATUS			(1 << 2)

enum {
	RTC_SEC = 0,
	RTC_MIN,
	RTC_HOUR,
	RTC_WEEKDAY,
	RTC_DATE,
	RTC_MONTH,
	RTC_YEAR1,
	RTC_YEAR2,
};

struct max8998_rtc_info {
	struct device		*dev;
	struct max8998_dev	*max8998;
	struct i2c_client	*rtc;
	struct rtc_device	*rtc_dev;
	int irq;
};

static void max8998_data_to_tm(u8 *data, struct rtc_time *tm)
{
	tm->tm_sec = bcd2bin(data[RTC_SEC]);
	tm->tm_min = bcd2bin(data[RTC_MIN]);
	if (data[RTC_HOUR] & HOUR_12) {
		tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f);
		if (data[RTC_HOUR] & HOUR_PM)
			tm->tm_hour += 12;
	} else
		tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);

	tm->tm_wday = data[RTC_WEEKDAY] & 0x07;
	tm->tm_mday = bcd2bin(data[RTC_DATE]);
	tm->tm_mon = bcd2bin(data[RTC_MONTH]);
	tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100;
	tm->tm_year -= 1900;
}

static void max8998_tm_to_data(struct rtc_time *tm, u8 *data)
{
	data[RTC_SEC] = bin2bcd(tm->tm_sec);
	data[RTC_MIN] = bin2bcd(tm->tm_min);
	data[RTC_HOUR] = bin2bcd(tm->tm_hour);
	data[RTC_WEEKDAY] = tm->tm_wday;
	data[RTC_DATE] = bin2bcd(tm->tm_mday);
	data[RTC_MONTH] = bin2bcd(tm->tm_mon);
	data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100);
	data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100);
}

static int max8998_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct max8998_rtc_info *info = dev_get_drvdata(dev);
	u8 data[8];
	int ret;

	ret = max8998_bulk_read(info->rtc, MAX8998_RTC_SEC, 8, data);
	if (ret < 0)
		return ret;

	max8998_data_to_tm(data, tm);

	return rtc_valid_tm(tm);
}

static int max8998_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct max8998_rtc_info *info = dev_get_drvdata(dev);
	u8 data[8];

	max8998_tm_to_data(tm, data);

	return max8998_bulk_write(info->rtc, MAX8998_RTC_SEC, 8, data);
}

static int max8998_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct max8998_rtc_info *info = dev_get_drvdata(dev);
	u8 data[8];
	u8 val;
	int ret;

	ret = max8998_bulk_read(info->rtc, MAX8998_ALARM0_SEC, 8, data);
	if (ret < 0)
		return ret;

	max8998_data_to_tm(data, &alrm->time);

	ret = max8998_read_reg(info->rtc, MAX8998_ALARM0_CONF, &val);
	if (ret < 0)
		return ret;

	alrm->enabled = !!val;

	ret = max8998_read_reg(info->rtc, MAX8998_RTC_STATUS, &val);
	if (ret < 0)
		return ret;

	if (val & ALARM0_STATUS)
		alrm->pending = 1;
	else
		alrm->pending = 0;

	return 0;
}

static int max8998_rtc_stop_alarm(struct max8998_rtc_info *info)
{
	return max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, 0);
}

static int max8998_rtc_start_alarm(struct max8998_rtc_info *info)
{
	return max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, 0x77);
}

static int max8998_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct max8998_rtc_info *info = dev_get_drvdata(dev);
	u8 data[8];
	int ret;

	max8998_tm_to_data(&alrm->time, data);

	ret = max8998_rtc_stop_alarm(info);
	if (ret < 0)
		return ret;

	ret = max8998_bulk_write(info->rtc, MAX8998_ALARM0_SEC, 8, data);
	if (ret < 0)
		return ret;

	if (alrm->enabled)
		return max8998_rtc_start_alarm(info);

	return 0;
}

static int max8998_rtc_alarm_irq_enable(struct device *dev,
					unsigned int enabled)
{
	struct max8998_rtc_info *info = dev_get_drvdata(dev);

	if (enabled)
		return max8998_rtc_start_alarm(info);
	else
		return max8998_rtc_stop_alarm(info);
}

static irqreturn_t max8998_rtc_alarm_irq(int irq, void *data)
{
	struct max8998_rtc_info *info = data;

	rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);

	return IRQ_HANDLED;
}

static const struct rtc_class_ops max8998_rtc_ops = {
	.read_time = max8998_rtc_read_time,
	.set_time = max8998_rtc_set_time,
	.read_alarm = max8998_rtc_read_alarm,
	.set_alarm = max8998_rtc_set_alarm,
	.alarm_irq_enable = max8998_rtc_alarm_irq_enable,
};

static int __devinit max8998_rtc_probe(struct platform_device *pdev)
{
	struct max8998_dev *max8998 = dev_get_drvdata(pdev->dev.parent);
	struct max8998_rtc_info *info;
	int ret;

	info = kzalloc(sizeof(struct max8998_rtc_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	info->dev = &pdev->dev;
	info->max8998 = max8998;
	info->rtc = max8998->rtc;
	info->irq = max8998->irq_base + MAX8998_IRQ_ALARM0;

	info->rtc_dev = rtc_device_register("max8998-rtc", &pdev->dev,
			&max8998_rtc_ops, THIS_MODULE);

	if (IS_ERR(info->rtc_dev)) {
		ret = PTR_ERR(info->rtc_dev);
		dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
		goto out_rtc;
	}

	platform_set_drvdata(pdev, info);

	ret = request_threaded_irq(info->irq, NULL, max8998_rtc_alarm_irq, 0,
			"rtc-alarm0", info);
	if (ret < 0)
		dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
			info->irq, ret);

	return 0;

out_rtc:
	kfree(info);
	return ret;
}

static int __devexit max8998_rtc_remove(struct platform_device *pdev)
{
	struct max8998_rtc_info *info = platform_get_drvdata(pdev);

	if (info) {
		free_irq(info->irq, info);
		rtc_device_unregister(info->rtc_dev);
		kfree(info);
	}

	return 0;
}

static struct platform_driver max8998_rtc_driver = {
	.driver		= {
		.name	= "max8998-rtc",
		.owner	= THIS_MODULE,
	},
	.probe		= max8998_rtc_probe,
	.remove		= __devexit_p(max8998_rtc_remove),
};

static int __init max8998_rtc_init(void)
{
	return platform_driver_register(&max8998_rtc_driver);
}
module_init(max8998_rtc_init);

static void __exit max8998_rtc_exit(void)
{
	platform_driver_unregister(&max8998_rtc_driver);
}
module_exit(max8998_rtc_exit);

MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
MODULE_DESCRIPTION("Maxim MAX8998 RTC driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
9b16c0a4 JS	1	/*
	2	* RTC driver for Maxim MAX8998
	3	*
	4	* Copyright (C) 2010 Samsung Electronics Co.Ltd
	5	* Author: Minkyu Kang <mk7.kang@samsung.com>
	6	* Author: Joonyoung Shim <jy0922.shim@samsung.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/i2c.h>
	17	#include <linux/slab.h>
	18	#include <linux/bcd.h>
	19	#include <linux/rtc.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/mfd/max8998.h>
	22	#include <linux/mfd/max8998-private.h>
	23
	24	#define MAX8998_RTC_SEC 0x00
	25	#define MAX8998_RTC_MIN 0x01
	26	#define MAX8998_RTC_HOUR 0x02
	27	#define MAX8998_RTC_WEEKDAY 0x03
	28	#define MAX8998_RTC_DATE 0x04
	29	#define MAX8998_RTC_MONTH 0x05
	30	#define MAX8998_RTC_YEAR1 0x06
	31	#define MAX8998_RTC_YEAR2 0x07
	32	#define MAX8998_ALARM0_SEC 0x08
	33	#define MAX8998_ALARM0_MIN 0x09
	34	#define MAX8998_ALARM0_HOUR 0x0a
	35	#define MAX8998_ALARM0_WEEKDAY 0x0b
	36	#define MAX8998_ALARM0_DATE 0x0c
	37	#define MAX8998_ALARM0_MONTH 0x0d
	38	#define MAX8998_ALARM0_YEAR1 0x0e
	39	#define MAX8998_ALARM0_YEAR2 0x0f
	40	#define MAX8998_ALARM1_SEC 0x10
	41	#define MAX8998_ALARM1_MIN 0x11
	42	#define MAX8998_ALARM1_HOUR 0x12
	43	#define MAX8998_ALARM1_WEEKDAY 0x13
	44	#define MAX8998_ALARM1_DATE 0x14
	45	#define MAX8998_ALARM1_MONTH 0x15
	46	#define MAX8998_ALARM1_YEAR1 0x16
	47	#define MAX8998_ALARM1_YEAR2 0x17
	48	#define MAX8998_ALARM0_CONF 0x18
	49	#define MAX8998_ALARM1_CONF 0x19
	50	#define MAX8998_RTC_STATUS 0x1a
	51	#define MAX8998_WTSR_SMPL_CNTL 0x1b
	52	#define MAX8998_TEST 0x1f
	53
	54	#define HOUR_12 (1 << 7)
	55	#define HOUR_PM (1 << 5)
	56	#define ALARM0_STATUS (1 << 1)
	57	#define ALARM1_STATUS (1 << 2)
	58
	59	enum {
	60	RTC_SEC = 0,
	61	RTC_MIN,
	62	RTC_HOUR,
	63	RTC_WEEKDAY,
	64	RTC_DATE,
65	RTC_MONTH,
66	RTC_YEAR1,
67	RTC_YEAR2,
68	};
69
70	struct max8998_rtc_info {
71	struct device *dev;
72	struct max8998_dev *max8998;
73	struct i2c_client *rtc;
74	struct rtc_device *rtc_dev;
75	int irq;
76	};
77
78	static void max8998_data_to_tm(u8 data, struct rtc_time tm)
79	{
80	tm->tm_sec = bcd2bin(data[RTC_SEC]);
81	tm->tm_min = bcd2bin(data[RTC_MIN]);
82	if (data[RTC_HOUR] & HOUR_12) {
83	tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f);
84	if (data[RTC_HOUR] & HOUR_PM)
85	tm->tm_hour += 12;
86	} else
87	tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);
88
89	tm->tm_wday = data[RTC_WEEKDAY] & 0x07;
90	tm->tm_mday = bcd2bin(data[RTC_DATE]);
91	tm->tm_mon = bcd2bin(data[RTC_MONTH]);
92	tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100;
93	tm->tm_year -= 1900;
94	}
95
96	static void max8998_tm_to_data(struct rtc_time tm, u8 data)
97	{
98	data[RTC_SEC] = bin2bcd(tm->tm_sec);
99	data[RTC_MIN] = bin2bcd(tm->tm_min);
100	data[RTC_HOUR] = bin2bcd(tm->tm_hour);
101	data[RTC_WEEKDAY] = tm->tm_wday;
102	data[RTC_DATE] = bin2bcd(tm->tm_mday);
103	data[RTC_MONTH] = bin2bcd(tm->tm_mon);
104	data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100);
105	data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100);
106	}
107
108	static int max8998_rtc_read_time(struct device dev, struct rtc_time tm)
109	{
110	struct max8998_rtc_info *info = dev_get_drvdata(dev);
111	u8 data[8];
112	int ret;
113
114	ret = max8998_bulk_read(info->rtc, MAX8998_RTC_SEC, 8, data);
115	if (ret < 0)
116	return ret;
117
118	max8998_data_to_tm(data, tm);
119
120	return rtc_valid_tm(tm);
121	}
122
123	static int max8998_rtc_set_time(struct device dev, struct rtc_time tm)
124	{
125	struct max8998_rtc_info *info = dev_get_drvdata(dev);
126	u8 data[8];
127
128	max8998_tm_to_data(tm, data);
129
130	return max8998_bulk_write(info->rtc, MAX8998_RTC_SEC, 8, data);
131	}
132
133	static int max8998_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
134	{
135	struct max8998_rtc_info *info = dev_get_drvdata(dev);
136	u8 data[8];
137	u8 val;
138	int ret;
139
140	ret = max8998_bulk_read(info->rtc, MAX8998_ALARM0_SEC, 8, data);
141	if (ret < 0)
142	return ret;
143
144	max8998_data_to_tm(data, &alrm->time);
145
146	ret = max8998_read_reg(info->rtc, MAX8998_ALARM0_CONF, &val);
147	if (ret < 0)
148	return ret;
149
150	alrm->enabled = !!val;
151
152	ret = max8998_read_reg(info->rtc, MAX8998_RTC_STATUS, &val);
153	if (ret < 0)
154	return ret;
155
156	if (val & ALARM0_STATUS)
157	alrm->pending = 1;
158	else
159	alrm->pending = 0;
160
161	return 0;
162	}
163
164	static int max8998_rtc_stop_alarm(struct max8998_rtc_info *info)
165	{
166	return max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, 0);
167	}
168
169	static int max8998_rtc_start_alarm(struct max8998_rtc_info *info)
170	{
171	return max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, 0x77);
172	}
173
174	static int max8998_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
175	{
176	struct max8998_rtc_info *info = dev_get_drvdata(dev);
177	u8 data[8];
178	int ret;
179
180	max8998_tm_to_data(&alrm->time, data);
181
182	ret = max8998_rtc_stop_alarm(info);
183	if (ret < 0)
184	return ret;
185
186	ret = max8998_bulk_write(info->rtc, MAX8998_ALARM0_SEC, 8, data);
187	if (ret < 0)
188	return ret;
189
190	if (alrm->enabled)
191	return max8998_rtc_start_alarm(info);
192
193	return 0;
194	}
195
196	static int max8998_rtc_alarm_irq_enable(struct device *dev,
197	unsigned int enabled)
198	{
199	struct max8998_rtc_info *info = dev_get_drvdata(dev);
200
201	if (enabled)
202	return max8998_rtc_start_alarm(info);
203	else
204	return max8998_rtc_stop_alarm(info);
205	}
206
207	static irqreturn_t max8998_rtc_alarm_irq(int irq, void *data)
208	{
209	struct max8998_rtc_info *info = data;
210
211	rtc_update_irq(info->rtc_dev, 1, RTC_IRQF \| RTC_AF);
212
213	return IRQ_HANDLED;
214	}
215
216	static const struct rtc_class_ops max8998_rtc_ops = {
217	.read_time = max8998_rtc_read_time,
218	.set_time = max8998_rtc_set_time,
219	.read_alarm = max8998_rtc_read_alarm,
220	.set_alarm = max8998_rtc_set_alarm,
221	.alarm_irq_enable = max8998_rtc_alarm_irq_enable,
222	};
223
224	static int __devinit max8998_rtc_probe(struct platform_device *pdev)
225	{
226	struct max8998_dev *max8998 = dev_get_drvdata(pdev->dev.parent);
227	struct max8998_rtc_info *info;
228	int ret;
229
230	info = kzalloc(sizeof(struct max8998_rtc_info), GFP_KERNEL);
231	if (!info)
232	return -ENOMEM;
233
234	info->dev = &pdev->dev;
235	info->max8998 = max8998;
236	info->rtc = max8998->rtc;
237	info->irq = max8998->irq_base + MAX8998_IRQ_ALARM0;
238
239	info->rtc_dev = rtc_device_register("max8998-rtc", &pdev->dev,
240	&max8998_rtc_ops, THIS_MODULE);
241
242	if (IS_ERR(info->rtc_dev)) {
243	ret = PTR_ERR(info->rtc_dev);
244	dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
245	goto out_rtc;
246	}
247
248	platform_set_drvdata(pdev, info);
249
250	ret = request_threaded_irq(info->irq, NULL, max8998_rtc_alarm_irq, 0,
251	"rtc-alarm0", info);
252	if (ret < 0)
253	dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
254	info->irq, ret);
255
256	return 0;
257
258	out_rtc:
259	kfree(info);
260	return ret;
261	}
262
263	static int __devexit max8998_rtc_remove(struct platform_device *pdev)
264	{
265	struct max8998_rtc_info *info = platform_get_drvdata(pdev);
266
267	if (info) {
268	free_irq(info->irq, info);
269	rtc_device_unregister(info->rtc_dev);
270	kfree(info);
271	}
272
273	return 0;
274	}
275
276	static struct platform_driver max8998_rtc_driver = {
277	.driver = {
278	.name = "max8998-rtc",
279	.owner = THIS_MODULE,
280	},
281	.probe = max8998_rtc_probe,
282	.remove = __devexit_p(max8998_rtc_remove),
283	};
284
285	static int __init max8998_rtc_init(void)
286	{
287	return platform_driver_register(&max8998_rtc_driver);
288	}
289	module_init(max8998_rtc_init);
290
291	static void __exit max8998_rtc_exit(void)
292	{
293	platform_driver_unregister(&max8998_rtc_driver);
294	}
295	module_exit(max8998_rtc_exit);
296
297	MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");
298	MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
299	MODULE_DESCRIPTION("Maxim MAX8998 RTC driver");
300	MODULE_LICENSE("GPL");