Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * RTC driver for Maxim MAX8907
4 *
5 * Copyright (c) 2011-2012, NVIDIA Corporation.
6 *
7 * Based on drivers/rtc/rtc-max8925.c,
8 * Copyright (C) 2009-2010 Marvell International Ltd.
9 */
10
11#include <linux/bcd.h>
12#include <linux/i2c.h>
13#include <linux/mfd/max8907.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/regmap.h>
17#include <linux/rtc.h>
18#include <linux/slab.h>
19
20enum {
21 RTC_SEC = 0,
22 RTC_MIN,
23 RTC_HOUR,
24 RTC_WEEKDAY,
25 RTC_DATE,
26 RTC_MONTH,
27 RTC_YEAR1,
28 RTC_YEAR2,
29};
30
31#define TIME_NUM 8
32#define ALARM_1SEC (1 << 7)
33#define HOUR_12 (1 << 7)
34#define HOUR_AM_PM (1 << 5)
35#define ALARM0_IRQ (1 << 3)
36#define ALARM1_IRQ (1 << 2)
37#define ALARM0_STATUS (1 << 2)
38#define ALARM1_STATUS (1 << 1)
39
40struct max8907_rtc {
41 struct max8907 *max8907;
42 struct regmap *regmap;
43 struct rtc_device *rtc_dev;
44 int irq;
45};
46
47static irqreturn_t max8907_irq_handler(int irq, void *data)
48{
49 struct max8907_rtc *rtc = data;
50
51 regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0);
52
53 rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
54
55 return IRQ_HANDLED;
56}
57
58static void regs_to_tm(u8 *regs, struct rtc_time *tm)
59{
60 tm->tm_year = bcd2bin(regs[RTC_YEAR2]) * 100 +
61 bcd2bin(regs[RTC_YEAR1]) - 1900;
62 tm->tm_mon = bcd2bin(regs[RTC_MONTH] & 0x1f) - 1;
63 tm->tm_mday = bcd2bin(regs[RTC_DATE] & 0x3f);
64 tm->tm_wday = (regs[RTC_WEEKDAY] & 0x07);
65 if (regs[RTC_HOUR] & HOUR_12) {
66 tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x01f);
67 if (tm->tm_hour == 12)
68 tm->tm_hour = 0;
69 if (regs[RTC_HOUR] & HOUR_AM_PM)
70 tm->tm_hour += 12;
71 } else {
72 tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x03f);
73 }
74 tm->tm_min = bcd2bin(regs[RTC_MIN] & 0x7f);
75 tm->tm_sec = bcd2bin(regs[RTC_SEC] & 0x7f);
76}
77
78static void tm_to_regs(struct rtc_time *tm, u8 *regs)
79{
80 u8 high, low;
81
82 high = (tm->tm_year + 1900) / 100;
83 low = tm->tm_year % 100;
84 regs[RTC_YEAR2] = bin2bcd(high);
85 regs[RTC_YEAR1] = bin2bcd(low);
86 regs[RTC_MONTH] = bin2bcd(tm->tm_mon + 1);
87 regs[RTC_DATE] = bin2bcd(tm->tm_mday);
88 regs[RTC_WEEKDAY] = tm->tm_wday;
89 regs[RTC_HOUR] = bin2bcd(tm->tm_hour);
90 regs[RTC_MIN] = bin2bcd(tm->tm_min);
91 regs[RTC_SEC] = bin2bcd(tm->tm_sec);
92}
93
94static int max8907_rtc_read_time(struct device *dev, struct rtc_time *tm)
95{
96 struct max8907_rtc *rtc = dev_get_drvdata(dev);
97 u8 regs[TIME_NUM];
98 int ret;
99
100 ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_RTC_SEC, regs,
101 TIME_NUM);
102 if (ret < 0)
103 return ret;
104
105 regs_to_tm(regs, tm);
106
107 return 0;
108}
109
110static int max8907_rtc_set_time(struct device *dev, struct rtc_time *tm)
111{
112 struct max8907_rtc *rtc = dev_get_drvdata(dev);
113 u8 regs[TIME_NUM];
114
115 tm_to_regs(tm, regs);
116
117 return regmap_bulk_write(rtc->regmap, MAX8907_REG_RTC_SEC, regs,
118 TIME_NUM);
119}
120
121static int max8907_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
122{
123 struct max8907_rtc *rtc = dev_get_drvdata(dev);
124 u8 regs[TIME_NUM];
125 unsigned int val;
126 int ret;
127
128 ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs,
129 TIME_NUM);
130 if (ret < 0)
131 return ret;
132
133 regs_to_tm(regs, &alrm->time);
134
135 ret = regmap_read(rtc->regmap, MAX8907_REG_ALARM0_CNTL, &val);
136 if (ret < 0)
137 return ret;
138
139 alrm->enabled = !!(val & 0x7f);
140
141 return 0;
142}
143
144static int max8907_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
145{
146 struct max8907_rtc *rtc = dev_get_drvdata(dev);
147 u8 regs[TIME_NUM];
148 int ret;
149
150 tm_to_regs(&alrm->time, regs);
151
152 /* Disable alarm while we update the target time */
153 ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0);
154 if (ret < 0)
155 return ret;
156
157 ret = regmap_bulk_write(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs,
158 TIME_NUM);
159 if (ret < 0)
160 return ret;
161
162 if (alrm->enabled)
163 ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0x77);
164
165 return ret;
166}
167
168static const struct rtc_class_ops max8907_rtc_ops = {
169 .read_time = max8907_rtc_read_time,
170 .set_time = max8907_rtc_set_time,
171 .read_alarm = max8907_rtc_read_alarm,
172 .set_alarm = max8907_rtc_set_alarm,
173};
174
175static int max8907_rtc_probe(struct platform_device *pdev)
176{
177 struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent);
178 struct max8907_rtc *rtc;
179 int ret;
180
181 rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
182 if (!rtc)
183 return -ENOMEM;
184 platform_set_drvdata(pdev, rtc);
185
186 rtc->max8907 = max8907;
187 rtc->regmap = max8907->regmap_rtc;
188
189 rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8907-rtc",
190 &max8907_rtc_ops, THIS_MODULE);
191 if (IS_ERR(rtc->rtc_dev)) {
192 ret = PTR_ERR(rtc->rtc_dev);
193 dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
194 return ret;
195 }
196
197 rtc->irq = regmap_irq_get_virq(max8907->irqc_rtc,
198 MAX8907_IRQ_RTC_ALARM0);
199 if (rtc->irq < 0)
200 return rtc->irq;
201
202 ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
203 max8907_irq_handler,
204 IRQF_ONESHOT, "max8907-alarm0", rtc);
205 if (ret < 0)
206 dev_err(&pdev->dev, "Failed to request IRQ%d: %d\n",
207 rtc->irq, ret);
208
209 return ret;
210}
211
212static struct platform_driver max8907_rtc_driver = {
213 .driver = {
214 .name = "max8907-rtc",
215 },
216 .probe = max8907_rtc_probe,
217};
218module_platform_driver(max8907_rtc_driver);
219
220MODULE_DESCRIPTION("Maxim MAX8907 RTC driver");
221MODULE_LICENSE("GPL v2");
1/*
2 * RTC driver for Maxim MAX8907
3 *
4 * Copyright (c) 2011-2012, NVIDIA Corporation.
5 *
6 * Based on drivers/rtc/rtc-max8925.c,
7 * Copyright (C) 2009-2010 Marvell International Ltd.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/bcd.h>
15#include <linux/i2c.h>
16#include <linux/mfd/max8907.h>
17#include <linux/module.h>
18#include <linux/platform_device.h>
19#include <linux/regmap.h>
20#include <linux/rtc.h>
21#include <linux/slab.h>
22
23enum {
24 RTC_SEC = 0,
25 RTC_MIN,
26 RTC_HOUR,
27 RTC_WEEKDAY,
28 RTC_DATE,
29 RTC_MONTH,
30 RTC_YEAR1,
31 RTC_YEAR2,
32};
33
34#define TIME_NUM 8
35#define ALARM_1SEC (1 << 7)
36#define HOUR_12 (1 << 7)
37#define HOUR_AM_PM (1 << 5)
38#define ALARM0_IRQ (1 << 3)
39#define ALARM1_IRQ (1 << 2)
40#define ALARM0_STATUS (1 << 2)
41#define ALARM1_STATUS (1 << 1)
42
43struct max8907_rtc {
44 struct max8907 *max8907;
45 struct regmap *regmap;
46 struct rtc_device *rtc_dev;
47 int irq;
48};
49
50static irqreturn_t max8907_irq_handler(int irq, void *data)
51{
52 struct max8907_rtc *rtc = data;
53
54 regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0);
55
56 rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
57
58 return IRQ_HANDLED;
59}
60
61static void regs_to_tm(u8 *regs, struct rtc_time *tm)
62{
63 tm->tm_year = bcd2bin(regs[RTC_YEAR2]) * 100 +
64 bcd2bin(regs[RTC_YEAR1]) - 1900;
65 tm->tm_mon = bcd2bin(regs[RTC_MONTH] & 0x1f) - 1;
66 tm->tm_mday = bcd2bin(regs[RTC_DATE] & 0x3f);
67 tm->tm_wday = (regs[RTC_WEEKDAY] & 0x07);
68 if (regs[RTC_HOUR] & HOUR_12) {
69 tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x01f);
70 if (tm->tm_hour == 12)
71 tm->tm_hour = 0;
72 if (regs[RTC_HOUR] & HOUR_AM_PM)
73 tm->tm_hour += 12;
74 } else {
75 tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x03f);
76 }
77 tm->tm_min = bcd2bin(regs[RTC_MIN] & 0x7f);
78 tm->tm_sec = bcd2bin(regs[RTC_SEC] & 0x7f);
79}
80
81static void tm_to_regs(struct rtc_time *tm, u8 *regs)
82{
83 u8 high, low;
84
85 high = (tm->tm_year + 1900) / 100;
86 low = tm->tm_year % 100;
87 regs[RTC_YEAR2] = bin2bcd(high);
88 regs[RTC_YEAR1] = bin2bcd(low);
89 regs[RTC_MONTH] = bin2bcd(tm->tm_mon + 1);
90 regs[RTC_DATE] = bin2bcd(tm->tm_mday);
91 regs[RTC_WEEKDAY] = tm->tm_wday;
92 regs[RTC_HOUR] = bin2bcd(tm->tm_hour);
93 regs[RTC_MIN] = bin2bcd(tm->tm_min);
94 regs[RTC_SEC] = bin2bcd(tm->tm_sec);
95}
96
97static int max8907_rtc_read_time(struct device *dev, struct rtc_time *tm)
98{
99 struct max8907_rtc *rtc = dev_get_drvdata(dev);
100 u8 regs[TIME_NUM];
101 int ret;
102
103 ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_RTC_SEC, regs,
104 TIME_NUM);
105 if (ret < 0)
106 return ret;
107
108 regs_to_tm(regs, tm);
109
110 return 0;
111}
112
113static int max8907_rtc_set_time(struct device *dev, struct rtc_time *tm)
114{
115 struct max8907_rtc *rtc = dev_get_drvdata(dev);
116 u8 regs[TIME_NUM];
117
118 tm_to_regs(tm, regs);
119
120 return regmap_bulk_write(rtc->regmap, MAX8907_REG_RTC_SEC, regs,
121 TIME_NUM);
122}
123
124static int max8907_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
125{
126 struct max8907_rtc *rtc = dev_get_drvdata(dev);
127 u8 regs[TIME_NUM];
128 unsigned int val;
129 int ret;
130
131 ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs,
132 TIME_NUM);
133 if (ret < 0)
134 return ret;
135
136 regs_to_tm(regs, &alrm->time);
137
138 ret = regmap_read(rtc->regmap, MAX8907_REG_ALARM0_CNTL, &val);
139 if (ret < 0)
140 return ret;
141
142 alrm->enabled = !!(val & 0x7f);
143
144 return 0;
145}
146
147static int max8907_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
148{
149 struct max8907_rtc *rtc = dev_get_drvdata(dev);
150 u8 regs[TIME_NUM];
151 int ret;
152
153 tm_to_regs(&alrm->time, regs);
154
155 /* Disable alarm while we update the target time */
156 ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0);
157 if (ret < 0)
158 return ret;
159
160 ret = regmap_bulk_write(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs,
161 TIME_NUM);
162 if (ret < 0)
163 return ret;
164
165 if (alrm->enabled)
166 ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0x77);
167
168 return ret;
169}
170
171static const struct rtc_class_ops max8907_rtc_ops = {
172 .read_time = max8907_rtc_read_time,
173 .set_time = max8907_rtc_set_time,
174 .read_alarm = max8907_rtc_read_alarm,
175 .set_alarm = max8907_rtc_set_alarm,
176};
177
178static int max8907_rtc_probe(struct platform_device *pdev)
179{
180 struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent);
181 struct max8907_rtc *rtc;
182 int ret;
183
184 rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
185 if (!rtc)
186 return -ENOMEM;
187 platform_set_drvdata(pdev, rtc);
188
189 rtc->max8907 = max8907;
190 rtc->regmap = max8907->regmap_rtc;
191
192 rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8907-rtc",
193 &max8907_rtc_ops, THIS_MODULE);
194 if (IS_ERR(rtc->rtc_dev)) {
195 ret = PTR_ERR(rtc->rtc_dev);
196 dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
197 return ret;
198 }
199
200 rtc->irq = regmap_irq_get_virq(max8907->irqc_rtc,
201 MAX8907_IRQ_RTC_ALARM0);
202 if (rtc->irq < 0)
203 return rtc->irq;
204
205 ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
206 max8907_irq_handler,
207 IRQF_ONESHOT, "max8907-alarm0", rtc);
208 if (ret < 0)
209 dev_err(&pdev->dev, "Failed to request IRQ%d: %d\n",
210 rtc->irq, ret);
211
212 return ret;
213}
214
215static struct platform_driver max8907_rtc_driver = {
216 .driver = {
217 .name = "max8907-rtc",
218 },
219 .probe = max8907_rtc_probe,
220};
221module_platform_driver(max8907_rtc_driver);
222
223MODULE_DESCRIPTION("Maxim MAX8907 RTC driver");
224MODULE_LICENSE("GPL v2");