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1 | /* |
2 | * drivers/rtc/rtc-pcf85363.c | |
3 | * | |
4 | * Driver for NXP PCF85363 real-time clock. | |
5 | * | |
6 | * Copyright (C) 2017 Eric Nelson | |
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 version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * Based loosely on rtc-8583 by Russell King, Wolfram Sang and Juergen Beisert | |
13 | */ | |
14 | #include <linux/module.h> | |
15 | #include <linux/i2c.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/rtc.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/bcd.h> | |
22 | #include <linux/of.h> | |
23 | #include <linux/of_device.h> | |
24 | #include <linux/regmap.h> | |
25 | ||
26 | /* | |
27 | * Date/Time registers | |
28 | */ | |
29 | #define DT_100THS 0x00 | |
30 | #define DT_SECS 0x01 | |
31 | #define DT_MINUTES 0x02 | |
32 | #define DT_HOURS 0x03 | |
33 | #define DT_DAYS 0x04 | |
34 | #define DT_WEEKDAYS 0x05 | |
35 | #define DT_MONTHS 0x06 | |
36 | #define DT_YEARS 0x07 | |
37 | ||
38 | /* | |
39 | * Alarm registers | |
40 | */ | |
41 | #define DT_SECOND_ALM1 0x08 | |
42 | #define DT_MINUTE_ALM1 0x09 | |
43 | #define DT_HOUR_ALM1 0x0a | |
44 | #define DT_DAY_ALM1 0x0b | |
45 | #define DT_MONTH_ALM1 0x0c | |
46 | #define DT_MINUTE_ALM2 0x0d | |
47 | #define DT_HOUR_ALM2 0x0e | |
48 | #define DT_WEEKDAY_ALM2 0x0f | |
49 | #define DT_ALARM_EN 0x10 | |
50 | ||
51 | /* | |
52 | * Time stamp registers | |
53 | */ | |
54 | #define DT_TIMESTAMP1 0x11 | |
55 | #define DT_TIMESTAMP2 0x17 | |
56 | #define DT_TIMESTAMP3 0x1d | |
57 | #define DT_TS_MODE 0x23 | |
58 | ||
59 | /* | |
60 | * control registers | |
61 | */ | |
62 | #define CTRL_OFFSET 0x24 | |
63 | #define CTRL_OSCILLATOR 0x25 | |
64 | #define CTRL_BATTERY 0x26 | |
65 | #define CTRL_PIN_IO 0x27 | |
66 | #define CTRL_FUNCTION 0x28 | |
67 | #define CTRL_INTA_EN 0x29 | |
68 | #define CTRL_INTB_EN 0x2a | |
69 | #define CTRL_FLAGS 0x2b | |
70 | #define CTRL_RAMBYTE 0x2c | |
71 | #define CTRL_WDOG 0x2d | |
72 | #define CTRL_STOP_EN 0x2e | |
73 | #define CTRL_RESETS 0x2f | |
74 | #define CTRL_RAM 0x40 | |
75 | ||
76 | #define NVRAM_SIZE 0x40 | |
77 | ||
78 | static struct i2c_driver pcf85363_driver; | |
79 | ||
80 | struct pcf85363 { | |
81 | struct device *dev; | |
82 | struct rtc_device *rtc; | |
83 | struct nvmem_config nvmem_cfg; | |
84 | struct regmap *regmap; | |
85 | }; | |
86 | ||
87 | static int pcf85363_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
88 | { | |
89 | struct pcf85363 *pcf85363 = dev_get_drvdata(dev); | |
90 | unsigned char buf[DT_YEARS + 1]; | |
91 | int ret, len = sizeof(buf); | |
92 | ||
93 | /* read the RTC date and time registers all at once */ | |
94 | ret = regmap_bulk_read(pcf85363->regmap, DT_100THS, buf, len); | |
95 | if (ret) { | |
96 | dev_err(dev, "%s: error %d\n", __func__, ret); | |
97 | return ret; | |
98 | } | |
99 | ||
100 | tm->tm_year = bcd2bin(buf[DT_YEARS]); | |
101 | /* adjust for 1900 base of rtc_time */ | |
102 | tm->tm_year += 100; | |
103 | ||
104 | tm->tm_wday = buf[DT_WEEKDAYS] & 7; | |
105 | buf[DT_SECS] &= 0x7F; | |
106 | tm->tm_sec = bcd2bin(buf[DT_SECS]); | |
107 | buf[DT_MINUTES] &= 0x7F; | |
108 | tm->tm_min = bcd2bin(buf[DT_MINUTES]); | |
109 | tm->tm_hour = bcd2bin(buf[DT_HOURS]); | |
110 | tm->tm_mday = bcd2bin(buf[DT_DAYS]); | |
111 | tm->tm_mon = bcd2bin(buf[DT_MONTHS]) - 1; | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
116 | static int pcf85363_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
117 | { | |
118 | struct pcf85363 *pcf85363 = dev_get_drvdata(dev); | |
119 | unsigned char buf[DT_YEARS + 1]; | |
120 | int len = sizeof(buf); | |
121 | ||
122 | buf[DT_100THS] = 0; | |
123 | buf[DT_SECS] = bin2bcd(tm->tm_sec); | |
124 | buf[DT_MINUTES] = bin2bcd(tm->tm_min); | |
125 | buf[DT_HOURS] = bin2bcd(tm->tm_hour); | |
126 | buf[DT_DAYS] = bin2bcd(tm->tm_mday); | |
127 | buf[DT_WEEKDAYS] = tm->tm_wday; | |
128 | buf[DT_MONTHS] = bin2bcd(tm->tm_mon + 1); | |
129 | buf[DT_YEARS] = bin2bcd(tm->tm_year % 100); | |
130 | ||
131 | return regmap_bulk_write(pcf85363->regmap, DT_100THS, | |
132 | buf, len); | |
133 | } | |
134 | ||
135 | static const struct rtc_class_ops rtc_ops = { | |
136 | .read_time = pcf85363_rtc_read_time, | |
137 | .set_time = pcf85363_rtc_set_time, | |
138 | }; | |
139 | ||
140 | static int pcf85363_nvram_read(void *priv, unsigned int offset, void *val, | |
141 | size_t bytes) | |
142 | { | |
143 | struct pcf85363 *pcf85363 = priv; | |
144 | ||
145 | return regmap_bulk_read(pcf85363->regmap, CTRL_RAM + offset, | |
146 | val, bytes); | |
147 | } | |
148 | ||
149 | static int pcf85363_nvram_write(void *priv, unsigned int offset, void *val, | |
150 | size_t bytes) | |
151 | { | |
152 | struct pcf85363 *pcf85363 = priv; | |
153 | ||
154 | return regmap_bulk_write(pcf85363->regmap, CTRL_RAM + offset, | |
155 | val, bytes); | |
156 | } | |
157 | ||
158 | static const struct regmap_config regmap_config = { | |
159 | .reg_bits = 8, | |
160 | .val_bits = 8, | |
161 | }; | |
162 | ||
163 | static int pcf85363_probe(struct i2c_client *client, | |
164 | const struct i2c_device_id *id) | |
165 | { | |
166 | struct pcf85363 *pcf85363; | |
167 | ||
168 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) | |
169 | return -ENODEV; | |
170 | ||
171 | pcf85363 = devm_kzalloc(&client->dev, sizeof(struct pcf85363), | |
172 | GFP_KERNEL); | |
173 | if (!pcf85363) | |
174 | return -ENOMEM; | |
175 | ||
176 | pcf85363->regmap = devm_regmap_init_i2c(client, ®map_config); | |
177 | if (IS_ERR(pcf85363->regmap)) { | |
178 | dev_err(&client->dev, "regmap allocation failed\n"); | |
179 | return PTR_ERR(pcf85363->regmap); | |
180 | } | |
181 | ||
182 | pcf85363->dev = &client->dev; | |
183 | i2c_set_clientdata(client, pcf85363); | |
184 | ||
185 | pcf85363->rtc = devm_rtc_allocate_device(pcf85363->dev); | |
186 | if (IS_ERR(pcf85363->rtc)) | |
187 | return PTR_ERR(pcf85363->rtc); | |
188 | ||
189 | pcf85363->nvmem_cfg.name = "pcf85363-"; | |
190 | pcf85363->nvmem_cfg.word_size = 1; | |
191 | pcf85363->nvmem_cfg.stride = 1; | |
192 | pcf85363->nvmem_cfg.size = NVRAM_SIZE; | |
193 | pcf85363->nvmem_cfg.reg_read = pcf85363_nvram_read; | |
194 | pcf85363->nvmem_cfg.reg_write = pcf85363_nvram_write; | |
195 | pcf85363->nvmem_cfg.priv = pcf85363; | |
196 | pcf85363->rtc->nvmem_config = &pcf85363->nvmem_cfg; | |
197 | pcf85363->rtc->ops = &rtc_ops; | |
198 | ||
199 | return rtc_register_device(pcf85363->rtc); | |
200 | } | |
201 | ||
202 | static const struct of_device_id dev_ids[] = { | |
203 | { .compatible = "nxp,pcf85363" }, | |
204 | {} | |
205 | }; | |
206 | MODULE_DEVICE_TABLE(of, dev_ids); | |
207 | ||
208 | static struct i2c_driver pcf85363_driver = { | |
209 | .driver = { | |
210 | .name = "pcf85363", | |
211 | .of_match_table = of_match_ptr(dev_ids), | |
212 | }, | |
213 | .probe = pcf85363_probe, | |
214 | }; | |
215 | ||
216 | module_i2c_driver(pcf85363_driver); | |
217 | ||
218 | MODULE_AUTHOR("Eric Nelson"); | |
219 | MODULE_DESCRIPTION("pcf85363 I2C RTC driver"); | |
220 | MODULE_LICENSE("GPL"); |