[linux-2.6-block.git] / drivers / rtc / rtc-moxart.c

/*
 * MOXA ART RTC driver.
 *
 * Copyright (C) 2013 Jonas Jensen
 *
 * Jonas Jensen <jonas.jensen@gmail.com>
 *
 * Based on code from
 * Moxa Technology Co., Ltd. <www.moxa.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2.  This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>

#define GPIO_RTC_RESERVED			0x0C
#define GPIO_RTC_DATA_SET			0x10
#define GPIO_RTC_DATA_CLEAR			0x14
#define GPIO_RTC_PIN_PULL_ENABLE		0x18
#define GPIO_RTC_PIN_PULL_TYPE			0x1C
#define GPIO_RTC_INT_ENABLE			0x20
#define GPIO_RTC_INT_RAW_STATE			0x24
#define GPIO_RTC_INT_MASKED_STATE		0x28
#define GPIO_RTC_INT_MASK			0x2C
#define GPIO_RTC_INT_CLEAR			0x30
#define GPIO_RTC_INT_TRIGGER			0x34
#define GPIO_RTC_INT_BOTH			0x38
#define GPIO_RTC_INT_RISE_NEG			0x3C
#define GPIO_RTC_BOUNCE_ENABLE			0x40
#define GPIO_RTC_BOUNCE_PRE_SCALE		0x44
#define GPIO_RTC_PROTECT_W			0x8E
#define GPIO_RTC_PROTECT_R			0x8F
#define GPIO_RTC_YEAR_W				0x8C
#define GPIO_RTC_YEAR_R				0x8D
#define GPIO_RTC_DAY_W				0x8A
#define GPIO_RTC_DAY_R				0x8B
#define GPIO_RTC_MONTH_W			0x88
#define GPIO_RTC_MONTH_R			0x89
#define GPIO_RTC_DATE_W				0x86
#define GPIO_RTC_DATE_R				0x87
#define GPIO_RTC_HOURS_W			0x84
#define GPIO_RTC_HOURS_R			0x85
#define GPIO_RTC_MINUTES_W			0x82
#define GPIO_RTC_MINUTES_R			0x83
#define GPIO_RTC_SECONDS_W			0x80
#define GPIO_RTC_SECONDS_R			0x81
#define GPIO_RTC_DELAY_TIME			8

struct moxart_rtc {
	struct rtc_device *rtc;
	spinlock_t rtc_lock;
	int gpio_data, gpio_sclk, gpio_reset;
};

static int day_of_year[12] =	{ 0, 31, 59, 90, 120, 151, 181,
				  212, 243, 273, 304, 334 };

static void moxart_rtc_write_byte(struct device *dev, u8 data)
{
	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
	int i;

	for (i = 0; i < 8; i++, data >>= 1) {
		gpio_set_value(moxart_rtc->gpio_sclk, 0);
		gpio_set_value(moxart_rtc->gpio_data, ((data & 1) == 1));
		udelay(GPIO_RTC_DELAY_TIME);
		gpio_set_value(moxart_rtc->gpio_sclk, 1);
		udelay(GPIO_RTC_DELAY_TIME);
	}
}

static u8 moxart_rtc_read_byte(struct device *dev)
{
	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
	int i;
	u8 data = 0;

	for (i = 0; i < 8; i++) {
		gpio_set_value(moxart_rtc->gpio_sclk, 0);
		udelay(GPIO_RTC_DELAY_TIME);
		gpio_set_value(moxart_rtc->gpio_sclk, 1);
		udelay(GPIO_RTC_DELAY_TIME);
		if (gpio_get_value(moxart_rtc->gpio_data))
			data |= (1 << i);
		udelay(GPIO_RTC_DELAY_TIME);
	}
	return data;
}

static u8 moxart_rtc_read_register(struct device *dev, u8 cmd)
{
	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
	u8 data;
	unsigned long flags;

	local_irq_save(flags);

	gpio_direction_output(moxart_rtc->gpio_data, 0);
	gpio_set_value(moxart_rtc->gpio_reset, 1);
	udelay(GPIO_RTC_DELAY_TIME);
	moxart_rtc_write_byte(dev, cmd);
	gpio_direction_input(moxart_rtc->gpio_data);
	udelay(GPIO_RTC_DELAY_TIME);
	data = moxart_rtc_read_byte(dev);
	gpio_set_value(moxart_rtc->gpio_sclk, 0);
	gpio_set_value(moxart_rtc->gpio_reset, 0);
	udelay(GPIO_RTC_DELAY_TIME);

	local_irq_restore(flags);

	return data;
}

static void moxart_rtc_write_register(struct device *dev, u8 cmd, u8 data)
{
	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
	unsigned long flags;

	local_irq_save(flags);

	gpio_direction_output(moxart_rtc->gpio_data, 0);
	gpio_set_value(moxart_rtc->gpio_reset, 1);
	udelay(GPIO_RTC_DELAY_TIME);
	moxart_rtc_write_byte(dev, cmd);
	moxart_rtc_write_byte(dev, data);
	gpio_set_value(moxart_rtc->gpio_sclk, 0);
	gpio_set_value(moxart_rtc->gpio_reset, 0);
	udelay(GPIO_RTC_DELAY_TIME);

	local_irq_restore(flags);
}

static int moxart_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);

	spin_lock_irq(&moxart_rtc->rtc_lock);

	moxart_rtc_write_register(dev, GPIO_RTC_PROTECT_W, 0);
	moxart_rtc_write_register(dev, GPIO_RTC_YEAR_W,
				  (((tm->tm_year - 100) / 10) << 4) |
				  ((tm->tm_year - 100) % 10));

	moxart_rtc_write_register(dev, GPIO_RTC_MONTH_W,
				  (((tm->tm_mon + 1) / 10) << 4) |
				  ((tm->tm_mon + 1) % 10));

	moxart_rtc_write_register(dev, GPIO_RTC_DATE_W,
				  ((tm->tm_mday / 10) << 4) |
				  (tm->tm_mday % 10));

	moxart_rtc_write_register(dev, GPIO_RTC_HOURS_W,
				  ((tm->tm_hour / 10) << 4) |
				  (tm->tm_hour % 10));

	moxart_rtc_write_register(dev, GPIO_RTC_MINUTES_W,
				  ((tm->tm_min / 10) << 4) |
				  (tm->tm_min % 10));

	moxart_rtc_write_register(dev, GPIO_RTC_SECONDS_W,
				  ((tm->tm_sec / 10) << 4) |
				  (tm->tm_sec % 10));

	moxart_rtc_write_register(dev, GPIO_RTC_PROTECT_W, 0x80);

	spin_unlock_irq(&moxart_rtc->rtc_lock);

	dev_dbg(dev, "%s: success tm_year=%d tm_mon=%d\n"
		"tm_mday=%d tm_hour=%d tm_min=%d tm_sec=%d\n",
		__func__, tm->tm_year, tm->tm_mon, tm->tm_mday,
		tm->tm_hour, tm->tm_min, tm->tm_sec);

	return 0;
}

static int moxart_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
	unsigned char v;

	spin_lock_irq(&moxart_rtc->rtc_lock);

	v = moxart_rtc_read_register(dev, GPIO_RTC_SECONDS_R);
	tm->tm_sec = (((v & 0x70) >> 4) * 10) + (v & 0x0F);

	v = moxart_rtc_read_register(dev, GPIO_RTC_MINUTES_R);
	tm->tm_min = (((v & 0x70) >> 4) * 10) + (v & 0x0F);

	v = moxart_rtc_read_register(dev, GPIO_RTC_HOURS_R);
	if (v & 0x80) { /* 12-hour mode */
		tm->tm_hour = (((v & 0x10) >> 4) * 10) + (v & 0x0F);
		if (v & 0x20) { /* PM mode */
			tm->tm_hour += 12;
			if (tm->tm_hour >= 24)
				tm->tm_hour = 0;
		}
	} else { /* 24-hour mode */
		tm->tm_hour = (((v & 0x30) >> 4) * 10) + (v & 0x0F);
	}

	v = moxart_rtc_read_register(dev, GPIO_RTC_DATE_R);
	tm->tm_mday = (((v & 0x30) >> 4) * 10) + (v & 0x0F);

	v = moxart_rtc_read_register(dev, GPIO_RTC_MONTH_R);
	tm->tm_mon = (((v & 0x10) >> 4) * 10) + (v & 0x0F);
	tm->tm_mon--;

	v = moxart_rtc_read_register(dev, GPIO_RTC_YEAR_R);
	tm->tm_year = (((v & 0xF0) >> 4) * 10) + (v & 0x0F);
	tm->tm_year += 100;
	if (tm->tm_year <= 69)
		tm->tm_year += 100;

	v = moxart_rtc_read_register(dev, GPIO_RTC_DAY_R);
	tm->tm_wday = (v & 0x0f) - 1;
	tm->tm_yday = day_of_year[tm->tm_mon];
	tm->tm_yday += (tm->tm_mday - 1);
	if (tm->tm_mon >= 2) {
		if (!(tm->tm_year % 4) && (tm->tm_year % 100))
			tm->tm_yday++;
	}

	tm->tm_isdst = 0;

	spin_unlock_irq(&moxart_rtc->rtc_lock);

	return 0;
}

static const struct rtc_class_ops moxart_rtc_ops = {
	.read_time	= moxart_rtc_read_time,
	.set_time	= moxart_rtc_set_time,
};

static int moxart_rtc_probe(struct platform_device *pdev)
{
	struct moxart_rtc *moxart_rtc;
	int ret = 0;

	moxart_rtc = devm_kzalloc(&pdev->dev, sizeof(*moxart_rtc), GFP_KERNEL);
	if (!moxart_rtc)
		return -ENOMEM;

	moxart_rtc->gpio_data = of_get_named_gpio(pdev->dev.of_node,
						  "gpio-rtc-data", 0);
	if (!gpio_is_valid(moxart_rtc->gpio_data)) {
		dev_err(&pdev->dev, "invalid gpio (data): %d\n",
			moxart_rtc->gpio_data);
		return moxart_rtc->gpio_data;
	}

	moxart_rtc->gpio_sclk = of_get_named_gpio(pdev->dev.of_node,
						  "gpio-rtc-sclk", 0);
	if (!gpio_is_valid(moxart_rtc->gpio_sclk)) {
		dev_err(&pdev->dev, "invalid gpio (sclk): %d\n",
			moxart_rtc->gpio_sclk);
		return moxart_rtc->gpio_sclk;
	}

	moxart_rtc->gpio_reset = of_get_named_gpio(pdev->dev.of_node,
						   "gpio-rtc-reset", 0);
	if (!gpio_is_valid(moxart_rtc->gpio_reset)) {
		dev_err(&pdev->dev, "invalid gpio (reset): %d\n",
			moxart_rtc->gpio_reset);
		return moxart_rtc->gpio_reset;
	}

	spin_lock_init(&moxart_rtc->rtc_lock);
	platform_set_drvdata(pdev, moxart_rtc);

	ret = devm_gpio_request(&pdev->dev, moxart_rtc->gpio_data, "rtc_data");
	if (ret) {
		dev_err(&pdev->dev, "can't get rtc_data gpio\n");
		return ret;
	}

	ret = devm_gpio_request_one(&pdev->dev, moxart_rtc->gpio_sclk,
				    GPIOF_DIR_OUT, "rtc_sclk");
	if (ret) {
		dev_err(&pdev->dev, "can't get rtc_sclk gpio\n");
		return ret;
	}

	ret = devm_gpio_request_one(&pdev->dev, moxart_rtc->gpio_reset,
				    GPIOF_DIR_OUT, "rtc_reset");
	if (ret) {
		dev_err(&pdev->dev, "can't get rtc_reset gpio\n");
		return ret;
	}

	moxart_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
						   &moxart_rtc_ops,
						   THIS_MODULE);
	if (IS_ERR(moxart_rtc->rtc)) {
		dev_err(&pdev->dev, "devm_rtc_device_register failed\n");
		return PTR_ERR(moxart_rtc->rtc);
	}

	return 0;
}

static const struct of_device_id moxart_rtc_match[] = {
	{ .compatible = "moxa,moxart-rtc" },
	{ },
};
MODULE_DEVICE_TABLE(of, moxart_rtc_match);

static struct platform_driver moxart_rtc_driver = {
	.probe	= moxart_rtc_probe,
	.driver	= {
		.name		= "moxart-rtc",
		.of_match_table	= moxart_rtc_match,
	},
};
module_platform_driver(moxart_rtc_driver);

MODULE_DESCRIPTION("MOXART RTC driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");
Commit	Line	Data
453b4c6d JJ	1	/*
	2	* MOXA ART RTC driver.
	3	*
	4	* Copyright (C) 2013 Jonas Jensen
	5	*
	6	* Jonas Jensen <jonas.jensen@gmail.com>
	7	*
	8	* Based on code from
	9	* Moxa Technology Co., Ltd. <www.moxa.com>
	10	*
	11	* This file is licensed under the terms of the GNU General Public
	12	* License version 2. This program is licensed "as is" without any
	13	* warranty of any kind, whether express or implied.
	14	*/
	15
	16	#include <linux/init.h>
	17	#include <linux/kernel.h>
	18	#include <linux/delay.h>
	19	#include <linux/rtc.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/module.h>
	22	#include <linux/gpio.h>
	23	#include <linux/of_gpio.h>
	24
	25	#define GPIO_RTC_RESERVED 0x0C
	26	#define GPIO_RTC_DATA_SET 0x10
	27	#define GPIO_RTC_DATA_CLEAR 0x14
	28	#define GPIO_RTC_PIN_PULL_ENABLE 0x18
	29	#define GPIO_RTC_PIN_PULL_TYPE 0x1C
	30	#define GPIO_RTC_INT_ENABLE 0x20
	31	#define GPIO_RTC_INT_RAW_STATE 0x24
	32	#define GPIO_RTC_INT_MASKED_STATE 0x28
	33	#define GPIO_RTC_INT_MASK 0x2C
	34	#define GPIO_RTC_INT_CLEAR 0x30
	35	#define GPIO_RTC_INT_TRIGGER 0x34
	36	#define GPIO_RTC_INT_BOTH 0x38
	37	#define GPIO_RTC_INT_RISE_NEG 0x3C
	38	#define GPIO_RTC_BOUNCE_ENABLE 0x40
	39	#define GPIO_RTC_BOUNCE_PRE_SCALE 0x44
	40	#define GPIO_RTC_PROTECT_W 0x8E
	41	#define GPIO_RTC_PROTECT_R 0x8F
	42	#define GPIO_RTC_YEAR_W 0x8C
	43	#define GPIO_RTC_YEAR_R 0x8D
	44	#define GPIO_RTC_DAY_W 0x8A
	45	#define GPIO_RTC_DAY_R 0x8B
	46	#define GPIO_RTC_MONTH_W 0x88
	47	#define GPIO_RTC_MONTH_R 0x89
	48	#define GPIO_RTC_DATE_W 0x86
	49	#define GPIO_RTC_DATE_R 0x87
	50	#define GPIO_RTC_HOURS_W 0x84
	51	#define GPIO_RTC_HOURS_R 0x85
	52	#define GPIO_RTC_MINUTES_W 0x82
	53	#define GPIO_RTC_MINUTES_R 0x83
	54	#define GPIO_RTC_SECONDS_W 0x80
	55	#define GPIO_RTC_SECONDS_R 0x81
	56	#define GPIO_RTC_DELAY_TIME 8
	57
	58	struct moxart_rtc {
	59	struct rtc_device *rtc;
	60	spinlock_t rtc_lock;
	61	int gpio_data, gpio_sclk, gpio_reset;
	62	};
	63
	64	static int day_of_year[12] = { 0, 31, 59, 90, 120, 151, 181,
65	212, 243, 273, 304, 334 };
66
67	static void moxart_rtc_write_byte(struct device *dev, u8 data)
68	{
69	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
70	int i;
71
72	for (i = 0; i < 8; i++, data >>= 1) {
73	gpio_set_value(moxart_rtc->gpio_sclk, 0);
74	gpio_set_value(moxart_rtc->gpio_data, ((data & 1) == 1));
75	udelay(GPIO_RTC_DELAY_TIME);
76	gpio_set_value(moxart_rtc->gpio_sclk, 1);
77	udelay(GPIO_RTC_DELAY_TIME);
78	}
79	}
80
81	static u8 moxart_rtc_read_byte(struct device *dev)
82	{
83	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
84	int i;
85	u8 data = 0;
86
87	for (i = 0; i < 8; i++) {
88	gpio_set_value(moxart_rtc->gpio_sclk, 0);
89	udelay(GPIO_RTC_DELAY_TIME);
90	gpio_set_value(moxart_rtc->gpio_sclk, 1);
91	udelay(GPIO_RTC_DELAY_TIME);
92	if (gpio_get_value(moxart_rtc->gpio_data))
93	data \|= (1 << i);
94	udelay(GPIO_RTC_DELAY_TIME);
95	}
96	return data;
97	}
98
99	static u8 moxart_rtc_read_register(struct device *dev, u8 cmd)
100	{
101	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
102	u8 data;
103	unsigned long flags;
104
105	local_irq_save(flags);
106
107	gpio_direction_output(moxart_rtc->gpio_data, 0);
108	gpio_set_value(moxart_rtc->gpio_reset, 1);
109	udelay(GPIO_RTC_DELAY_TIME);
110	moxart_rtc_write_byte(dev, cmd);
111	gpio_direction_input(moxart_rtc->gpio_data);
112	udelay(GPIO_RTC_DELAY_TIME);
113	data = moxart_rtc_read_byte(dev);
114	gpio_set_value(moxart_rtc->gpio_sclk, 0);
115	gpio_set_value(moxart_rtc->gpio_reset, 0);
116	udelay(GPIO_RTC_DELAY_TIME);
117
118	local_irq_restore(flags);
119
120	return data;
121	}
122
123	static void moxart_rtc_write_register(struct device *dev, u8 cmd, u8 data)
124	{
125	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
126	unsigned long flags;
127
128	local_irq_save(flags);
129
130	gpio_direction_output(moxart_rtc->gpio_data, 0);
131	gpio_set_value(moxart_rtc->gpio_reset, 1);
132	udelay(GPIO_RTC_DELAY_TIME);
133	moxart_rtc_write_byte(dev, cmd);
134	moxart_rtc_write_byte(dev, data);
135	gpio_set_value(moxart_rtc->gpio_sclk, 0);
136	gpio_set_value(moxart_rtc->gpio_reset, 0);
137	udelay(GPIO_RTC_DELAY_TIME);
138
139	local_irq_restore(flags);
140	}
141
142	static int moxart_rtc_set_time(struct device dev, struct rtc_time tm)
143	{
144	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
145
146	spin_lock_irq(&moxart_rtc->rtc_lock);
147
148	moxart_rtc_write_register(dev, GPIO_RTC_PROTECT_W, 0);
149	moxart_rtc_write_register(dev, GPIO_RTC_YEAR_W,
150	(((tm->tm_year - 100) / 10) << 4) \|
151	((tm->tm_year - 100) % 10));
152
153	moxart_rtc_write_register(dev, GPIO_RTC_MONTH_W,
154	(((tm->tm_mon + 1) / 10) << 4) \|
155	((tm->tm_mon + 1) % 10));
156
157	moxart_rtc_write_register(dev, GPIO_RTC_DATE_W,
158	((tm->tm_mday / 10) << 4) \|
159	(tm->tm_mday % 10));
160
161	moxart_rtc_write_register(dev, GPIO_RTC_HOURS_W,
162	((tm->tm_hour / 10) << 4) \|
163	(tm->tm_hour % 10));
164
165	moxart_rtc_write_register(dev, GPIO_RTC_MINUTES_W,
166	((tm->tm_min / 10) << 4) \|
167	(tm->tm_min % 10));
168
169	moxart_rtc_write_register(dev, GPIO_RTC_SECONDS_W,
170	((tm->tm_sec / 10) << 4) \|
171	(tm->tm_sec % 10));
172
173	moxart_rtc_write_register(dev, GPIO_RTC_PROTECT_W, 0x80);
174
175	spin_unlock_irq(&moxart_rtc->rtc_lock);
176
177	dev_dbg(dev, "%s: success tm_year=%d tm_mon=%d\n"
178	"tm_mday=%d tm_hour=%d tm_min=%d tm_sec=%d\n",
179	__func__, tm->tm_year, tm->tm_mon, tm->tm_mday,
180	tm->tm_hour, tm->tm_min, tm->tm_sec);
181
182	return 0;
183	}
184
185	static int moxart_rtc_read_time(struct device dev, struct rtc_time tm)
186	{
187	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
188	unsigned char v;
189
190	spin_lock_irq(&moxart_rtc->rtc_lock);
191
192	v = moxart_rtc_read_register(dev, GPIO_RTC_SECONDS_R);
193	tm->tm_sec = (((v & 0x70) >> 4) * 10) + (v & 0x0F);
194
195	v = moxart_rtc_read_register(dev, GPIO_RTC_MINUTES_R);
196	tm->tm_min = (((v & 0x70) >> 4) * 10) + (v & 0x0F);
197
198	v = moxart_rtc_read_register(dev, GPIO_RTC_HOURS_R);
199	if (v & 0x80) { /* 12-hour mode */
200	tm->tm_hour = (((v & 0x10) >> 4) * 10) + (v & 0x0F);
201	if (v & 0x20) { /* PM mode */
202	tm->tm_hour += 12;
203	if (tm->tm_hour >= 24)
204	tm->tm_hour = 0;
205	}
206	} else { /* 24-hour mode */
207	tm->tm_hour = (((v & 0x30) >> 4) * 10) + (v & 0x0F);
208	}
209
210	v = moxart_rtc_read_register(dev, GPIO_RTC_DATE_R);
211	tm->tm_mday = (((v & 0x30) >> 4) * 10) + (v & 0x0F);
212
213	v = moxart_rtc_read_register(dev, GPIO_RTC_MONTH_R);
214	tm->tm_mon = (((v & 0x10) >> 4) * 10) + (v & 0x0F);
215	tm->tm_mon--;
216
217	v = moxart_rtc_read_register(dev, GPIO_RTC_YEAR_R);
218	tm->tm_year = (((v & 0xF0) >> 4) * 10) + (v & 0x0F);
219	tm->tm_year += 100;
220	if (tm->tm_year <= 69)
221	tm->tm_year += 100;
222
223	v = moxart_rtc_read_register(dev, GPIO_RTC_DAY_R);
224	tm->tm_wday = (v & 0x0f) - 1;
225	tm->tm_yday = day_of_year[tm->tm_mon];
226	tm->tm_yday += (tm->tm_mday - 1);
227	if (tm->tm_mon >= 2) {
228	if (!(tm->tm_year % 4) && (tm->tm_year % 100))
229	tm->tm_yday++;
230	}
231
232	tm->tm_isdst = 0;
233
234	spin_unlock_irq(&moxart_rtc->rtc_lock);
235
236	return 0;
237	}
238
239	static const struct rtc_class_ops moxart_rtc_ops = {
240	.read_time = moxart_rtc_read_time,
241	.set_time = moxart_rtc_set_time,
242	};
243
244	static int moxart_rtc_probe(struct platform_device *pdev)
245	{
246	struct moxart_rtc *moxart_rtc;
247	int ret = 0;
248
249	moxart_rtc = devm_kzalloc(&pdev->dev, sizeof(*moxart_rtc), GFP_KERNEL);
4410af6e	250	if (!moxart_rtc)
453b4c6d	251	return -ENOMEM;
453b4c6d JJ	252
	253	moxart_rtc->gpio_data = of_get_named_gpio(pdev->dev.of_node,
	254	"gpio-rtc-data", 0);
	255	if (!gpio_is_valid(moxart_rtc->gpio_data)) {
	256	dev_err(&pdev->dev, "invalid gpio (data): %d\n",
	257	moxart_rtc->gpio_data);
	258	return moxart_rtc->gpio_data;
	259	}
	260
	261	moxart_rtc->gpio_sclk = of_get_named_gpio(pdev->dev.of_node,
	262	"gpio-rtc-sclk", 0);
	263	if (!gpio_is_valid(moxart_rtc->gpio_sclk)) {
	264	dev_err(&pdev->dev, "invalid gpio (sclk): %d\n",
	265	moxart_rtc->gpio_sclk);
	266	return moxart_rtc->gpio_sclk;
	267	}
	268
	269	moxart_rtc->gpio_reset = of_get_named_gpio(pdev->dev.of_node,
	270	"gpio-rtc-reset", 0);
	271	if (!gpio_is_valid(moxart_rtc->gpio_reset)) {
	272	dev_err(&pdev->dev, "invalid gpio (reset): %d\n",
	273	moxart_rtc->gpio_reset);
	274	return moxart_rtc->gpio_reset;
	275	}
	276
	277	spin_lock_init(&moxart_rtc->rtc_lock);
	278	platform_set_drvdata(pdev, moxart_rtc);
	279
	280	ret = devm_gpio_request(&pdev->dev, moxart_rtc->gpio_data, "rtc_data");
	281	if (ret) {
	282	dev_err(&pdev->dev, "can't get rtc_data gpio\n");
	283	return ret;
	284	}
	285
	286	ret = devm_gpio_request_one(&pdev->dev, moxart_rtc->gpio_sclk,
	287	GPIOF_DIR_OUT, "rtc_sclk");
	288	if (ret) {
	289	dev_err(&pdev->dev, "can't get rtc_sclk gpio\n");
	290	return ret;
	291	}
	292
	293	ret = devm_gpio_request_one(&pdev->dev, moxart_rtc->gpio_reset,
	294	GPIOF_DIR_OUT, "rtc_reset");
	295	if (ret) {
	296	dev_err(&pdev->dev, "can't get rtc_reset gpio\n");
	297	return ret;
	298	}
	299
	300	moxart_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
	301	&moxart_rtc_ops,
	302	THIS_MODULE);
	303	if (IS_ERR(moxart_rtc->rtc)) {
	304	dev_err(&pdev->dev, "devm_rtc_device_register failed\n");
	305	return PTR_ERR(moxart_rtc->rtc);
	306	}
	307
	308	return 0;
	309	}
	310
	311	static const struct of_device_id moxart_rtc_match[] = {
	312	{ .compatible = "moxa,moxart-rtc" },
	313	{ },
	314	};
73798d5c	315	MODULE_DEVICE_TABLE(of, moxart_rtc_match);
453b4c6d JJ	316
	317	static struct platform_driver moxart_rtc_driver = {
	318	.probe = moxart_rtc_probe,
	319	.driver = {
	320	.name = "moxart-rtc",
453b4c6d JJ	321	.of_match_table = moxart_rtc_match,
	322	},
	323	};
	324	module_platform_driver(moxart_rtc_driver);
	325
	326	MODULE_DESCRIPTION("MOXART RTC driver");
	327	MODULE_LICENSE("GPL");
	328	MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");