Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * An I2C driver for the Philips PCF8563 RTC |
| 3 | * Copyright 2005-06 Tower Technologies |
| 4 | * |
| 5 | * Author: Alessandro Zummo <a.zummo@towertech.it> |
| 6 | * Maintainers: http://www.nslu2-linux.org/ |
| 7 | * |
| 8 | * based on the other drivers in this same directory. |
| 9 | * |
| 10 | * http://www.semiconductors.philips.com/acrobat/datasheets/PCF8563-04.pdf |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License version 2 as |
| 14 | * published by the Free Software Foundation. |
| 15 | */ |
| 16 | |
| 17 | #include <linux/i2c.h> |
| 18 | #include <linux/bcd.h> |
| 19 | #include <linux/rtc.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 20 | #include <linux/slab.h> |
Paul Gortmaker | 2113852 | 2011-05-27 09:57:25 -0400 | [diff] [blame] | 21 | #include <linux/module.h> |
Nick Bowler | 8dccaf0 | 2012-07-30 14:41:59 -0700 | [diff] [blame] | 22 | #include <linux/of.h> |
Sachin Kamat | 23f809e | 2013-07-03 15:07:51 -0700 | [diff] [blame] | 23 | #include <linux/err.h> |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 24 | |
Alessandro Zummo | e5fc9cc | 2008-04-28 02:11:54 -0700 | [diff] [blame] | 25 | #define DRV_VERSION "0.4.3" |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 26 | |
| 27 | #define PCF8563_REG_ST1 0x00 /* status */ |
| 28 | #define PCF8563_REG_ST2 0x01 |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 29 | #define PCF8563_BIT_AIE (1 << 1) |
| 30 | #define PCF8563_BIT_AF (1 << 3) |
Jan Kardell | 45ef045 | 2014-12-10 15:53:34 -0800 | [diff] [blame] | 31 | #define PCF8563_BITS_ST2_N (7 << 5) |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 32 | |
| 33 | #define PCF8563_REG_SC 0x02 /* datetime */ |
| 34 | #define PCF8563_REG_MN 0x03 |
| 35 | #define PCF8563_REG_HR 0x04 |
| 36 | #define PCF8563_REG_DM 0x05 |
| 37 | #define PCF8563_REG_DW 0x06 |
| 38 | #define PCF8563_REG_MO 0x07 |
| 39 | #define PCF8563_REG_YR 0x08 |
| 40 | |
| 41 | #define PCF8563_REG_AMN 0x09 /* alarm */ |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 42 | |
| 43 | #define PCF8563_REG_CLKO 0x0D /* clock out */ |
| 44 | #define PCF8563_REG_TMRC 0x0E /* timer control */ |
Jan Kardell | ff0bc50 | 2014-12-10 15:53:43 -0800 | [diff] [blame] | 45 | #define PCF8563_TMRC_ENABLE BIT(7) |
| 46 | #define PCF8563_TMRC_4096 0 |
| 47 | #define PCF8563_TMRC_64 1 |
| 48 | #define PCF8563_TMRC_1 2 |
| 49 | #define PCF8563_TMRC_1_60 3 |
| 50 | #define PCF8563_TMRC_MASK 3 |
| 51 | |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 52 | #define PCF8563_REG_TMR 0x0F /* timer */ |
| 53 | |
| 54 | #define PCF8563_SC_LV 0x80 /* low voltage */ |
| 55 | #define PCF8563_MO_C 0x80 /* century */ |
| 56 | |
Alessandro Zummo | e5fc9cc | 2008-04-28 02:11:54 -0700 | [diff] [blame] | 57 | static struct i2c_driver pcf8563_driver; |
| 58 | |
Atsushi Nemoto | cbb9450 | 2007-02-08 14:20:24 -0800 | [diff] [blame] | 59 | struct pcf8563 { |
Alessandro Zummo | e5fc9cc | 2008-04-28 02:11:54 -0700 | [diff] [blame] | 60 | struct rtc_device *rtc; |
Atsushi Nemoto | cbb9450 | 2007-02-08 14:20:24 -0800 | [diff] [blame] | 61 | /* |
| 62 | * The meaning of MO_C bit varies by the chip type. |
| 63 | * From PCF8563 datasheet: this bit is toggled when the years |
| 64 | * register overflows from 99 to 00 |
| 65 | * 0 indicates the century is 20xx |
| 66 | * 1 indicates the century is 19xx |
| 67 | * From RTC8564 datasheet: this bit indicates change of |
| 68 | * century. When the year digit data overflows from 99 to 00, |
| 69 | * this bit is set. By presetting it to 0 while still in the |
| 70 | * 20th century, it will be set in year 2000, ... |
| 71 | * There seems no reliable way to know how the system use this |
| 72 | * bit. So let's do it heuristically, assuming we are live in |
| 73 | * 1970...2069. |
| 74 | */ |
| 75 | int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */ |
Alexander Stein | 0f20b76 | 2012-05-29 15:07:36 -0700 | [diff] [blame] | 76 | int voltage_low; /* incicates if a low_voltage was detected */ |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 77 | |
| 78 | struct i2c_client *client; |
Atsushi Nemoto | cbb9450 | 2007-02-08 14:20:24 -0800 | [diff] [blame] | 79 | }; |
| 80 | |
Vincent Donnefort | 2784366 | 2014-08-08 14:20:16 -0700 | [diff] [blame] | 81 | static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg, |
| 82 | unsigned char length, unsigned char *buf) |
| 83 | { |
| 84 | struct i2c_msg msgs[] = { |
| 85 | {/* setup read ptr */ |
| 86 | .addr = client->addr, |
| 87 | .len = 1, |
| 88 | .buf = ®, |
| 89 | }, |
| 90 | { |
| 91 | .addr = client->addr, |
| 92 | .flags = I2C_M_RD, |
| 93 | .len = length, |
| 94 | .buf = buf |
| 95 | }, |
| 96 | }; |
| 97 | |
| 98 | if ((i2c_transfer(client->adapter, msgs, 2)) != 2) { |
| 99 | dev_err(&client->dev, "%s: read error\n", __func__); |
| 100 | return -EIO; |
| 101 | } |
| 102 | |
| 103 | return 0; |
| 104 | } |
| 105 | |
| 106 | static int pcf8563_write_block_data(struct i2c_client *client, |
| 107 | unsigned char reg, unsigned char length, |
| 108 | unsigned char *buf) |
| 109 | { |
| 110 | int i, err; |
| 111 | |
| 112 | for (i = 0; i < length; i++) { |
| 113 | unsigned char data[2] = { reg + i, buf[i] }; |
| 114 | |
| 115 | err = i2c_master_send(client, data, sizeof(data)); |
| 116 | if (err != sizeof(data)) { |
| 117 | dev_err(&client->dev, |
| 118 | "%s: err=%d addr=%02x, data=%02x\n", |
| 119 | __func__, err, data[0], data[1]); |
| 120 | return -EIO; |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | return 0; |
| 125 | } |
| 126 | |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 127 | static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on) |
| 128 | { |
Jan Kardell | 17a1e5e | 2014-12-10 15:53:31 -0800 | [diff] [blame] | 129 | unsigned char buf; |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 130 | int err; |
| 131 | |
Jan Kardell | 17a1e5e | 2014-12-10 15:53:31 -0800 | [diff] [blame] | 132 | err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf); |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 133 | if (err < 0) |
| 134 | return err; |
| 135 | |
| 136 | if (on) |
Jan Kardell | 17a1e5e | 2014-12-10 15:53:31 -0800 | [diff] [blame] | 137 | buf |= PCF8563_BIT_AIE; |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 138 | else |
Jan Kardell | 17a1e5e | 2014-12-10 15:53:31 -0800 | [diff] [blame] | 139 | buf &= ~PCF8563_BIT_AIE; |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 140 | |
Jan Kardell | 45ef045 | 2014-12-10 15:53:34 -0800 | [diff] [blame] | 141 | buf &= ~(PCF8563_BIT_AF | PCF8563_BITS_ST2_N); |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 142 | |
Jan Kardell | 17a1e5e | 2014-12-10 15:53:31 -0800 | [diff] [blame] | 143 | err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf); |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 144 | if (err < 0) { |
| 145 | dev_err(&client->dev, "%s: write error\n", __func__); |
| 146 | return -EIO; |
| 147 | } |
| 148 | |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en, |
| 153 | unsigned char *pen) |
| 154 | { |
| 155 | unsigned char buf; |
| 156 | int err; |
| 157 | |
| 158 | err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf); |
| 159 | if (err) |
| 160 | return err; |
| 161 | |
| 162 | if (en) |
| 163 | *en = !!(buf & PCF8563_BIT_AIE); |
| 164 | if (pen) |
| 165 | *pen = !!(buf & PCF8563_BIT_AF); |
| 166 | |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | static irqreturn_t pcf8563_irq(int irq, void *dev_id) |
| 171 | { |
| 172 | struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id); |
| 173 | int err; |
| 174 | char pending; |
| 175 | |
| 176 | err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending); |
Arnd Bergmann | e698a51 | 2014-10-13 15:53:07 -0700 | [diff] [blame] | 177 | if (err) |
Arnd Bergmann | 3ff3823 | 2014-10-13 15:53:10 -0700 | [diff] [blame] | 178 | return IRQ_NONE; |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 179 | |
| 180 | if (pending) { |
| 181 | rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF); |
| 182 | pcf8563_set_alarm_mode(pcf8563->client, 1); |
| 183 | return IRQ_HANDLED; |
| 184 | } |
| 185 | |
| 186 | return IRQ_NONE; |
| 187 | } |
| 188 | |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 189 | /* |
| 190 | * In the routines that deal directly with the pcf8563 hardware, we use |
| 191 | * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch. |
| 192 | */ |
| 193 | static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm) |
| 194 | { |
Alessandro Zummo | e5fc9cc | 2008-04-28 02:11:54 -0700 | [diff] [blame] | 195 | struct pcf8563 *pcf8563 = i2c_get_clientdata(client); |
Vincent Donnefort | 2784366 | 2014-08-08 14:20:16 -0700 | [diff] [blame] | 196 | unsigned char buf[9]; |
| 197 | int err; |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 198 | |
Vincent Donnefort | 2784366 | 2014-08-08 14:20:16 -0700 | [diff] [blame] | 199 | err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf); |
| 200 | if (err) |
| 201 | return err; |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 202 | |
Alexander Stein | 0f20b76 | 2012-05-29 15:07:36 -0700 | [diff] [blame] | 203 | if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) { |
| 204 | pcf8563->voltage_low = 1; |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 205 | dev_info(&client->dev, |
| 206 | "low voltage detected, date/time is not reliable.\n"); |
Alexander Stein | 0f20b76 | 2012-05-29 15:07:36 -0700 | [diff] [blame] | 207 | } |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 208 | |
| 209 | dev_dbg(&client->dev, |
| 210 | "%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, " |
| 211 | "mday=%02x, wday=%02x, mon=%02x, year=%02x\n", |
Harvey Harrison | 2a4e2b8 | 2008-04-28 02:12:00 -0700 | [diff] [blame] | 212 | __func__, |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 213 | buf[0], buf[1], buf[2], buf[3], |
| 214 | buf[4], buf[5], buf[6], buf[7], |
| 215 | buf[8]); |
| 216 | |
| 217 | |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 218 | tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F); |
| 219 | tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F); |
| 220 | tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */ |
| 221 | tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F); |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 222 | tm->tm_wday = buf[PCF8563_REG_DW] & 0x07; |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 223 | tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */ |
| 224 | tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]); |
Atsushi Nemoto | cbb9450 | 2007-02-08 14:20:24 -0800 | [diff] [blame] | 225 | if (tm->tm_year < 70) |
| 226 | tm->tm_year += 100; /* assume we are in 1970...2069 */ |
| 227 | /* detect the polarity heuristically. see note above. */ |
| 228 | pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ? |
| 229 | (tm->tm_year >= 100) : (tm->tm_year < 100); |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 230 | |
| 231 | dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " |
| 232 | "mday=%d, mon=%d, year=%d, wday=%d\n", |
Harvey Harrison | 2a4e2b8 | 2008-04-28 02:12:00 -0700 | [diff] [blame] | 233 | __func__, |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 234 | tm->tm_sec, tm->tm_min, tm->tm_hour, |
| 235 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); |
| 236 | |
| 237 | /* the clock can give out invalid datetime, but we cannot return |
| 238 | * -EINVAL otherwise hwclock will refuse to set the time on bootup. |
| 239 | */ |
| 240 | if (rtc_valid_tm(tm) < 0) |
| 241 | dev_err(&client->dev, "retrieved date/time is not valid.\n"); |
| 242 | |
| 243 | return 0; |
| 244 | } |
| 245 | |
| 246 | static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm) |
| 247 | { |
Alessandro Zummo | e5fc9cc | 2008-04-28 02:11:54 -0700 | [diff] [blame] | 248 | struct pcf8563 *pcf8563 = i2c_get_clientdata(client); |
Vincent Donnefort | 2784366 | 2014-08-08 14:20:16 -0700 | [diff] [blame] | 249 | int err; |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 250 | unsigned char buf[9]; |
| 251 | |
| 252 | dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, " |
| 253 | "mday=%d, mon=%d, year=%d, wday=%d\n", |
Harvey Harrison | 2a4e2b8 | 2008-04-28 02:12:00 -0700 | [diff] [blame] | 254 | __func__, |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 255 | tm->tm_sec, tm->tm_min, tm->tm_hour, |
| 256 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); |
| 257 | |
| 258 | /* hours, minutes and seconds */ |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 259 | buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec); |
| 260 | buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min); |
| 261 | buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour); |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 262 | |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 263 | buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday); |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 264 | |
| 265 | /* month, 1 - 12 */ |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 266 | buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1); |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 267 | |
| 268 | /* year and century */ |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 269 | buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year % 100); |
Atsushi Nemoto | cbb9450 | 2007-02-08 14:20:24 -0800 | [diff] [blame] | 270 | if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100)) |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 271 | buf[PCF8563_REG_MO] |= PCF8563_MO_C; |
| 272 | |
| 273 | buf[PCF8563_REG_DW] = tm->tm_wday & 0x07; |
| 274 | |
Vincent Donnefort | 2784366 | 2014-08-08 14:20:16 -0700 | [diff] [blame] | 275 | err = pcf8563_write_block_data(client, PCF8563_REG_SC, |
| 276 | 9 - PCF8563_REG_SC, buf + PCF8563_REG_SC); |
| 277 | if (err) |
| 278 | return err; |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 279 | |
| 280 | return 0; |
| 281 | } |
| 282 | |
Alexander Stein | 0f20b76 | 2012-05-29 15:07:36 -0700 | [diff] [blame] | 283 | #ifdef CONFIG_RTC_INTF_DEV |
| 284 | static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) |
| 285 | { |
| 286 | struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev)); |
| 287 | struct rtc_time tm; |
| 288 | |
| 289 | switch (cmd) { |
| 290 | case RTC_VL_READ: |
| 291 | if (pcf8563->voltage_low) |
| 292 | dev_info(dev, "low voltage detected, date/time is not reliable.\n"); |
| 293 | |
| 294 | if (copy_to_user((void __user *)arg, &pcf8563->voltage_low, |
| 295 | sizeof(int))) |
| 296 | return -EFAULT; |
| 297 | return 0; |
| 298 | case RTC_VL_CLR: |
| 299 | /* |
| 300 | * Clear the VL bit in the seconds register in case |
| 301 | * the time has not been set already (which would |
| 302 | * have cleared it). This does not really matter |
| 303 | * because of the cached voltage_low value but do it |
| 304 | * anyway for consistency. |
| 305 | */ |
| 306 | if (pcf8563_get_datetime(to_i2c_client(dev), &tm)) |
| 307 | pcf8563_set_datetime(to_i2c_client(dev), &tm); |
| 308 | |
| 309 | /* Clear the cached value. */ |
| 310 | pcf8563->voltage_low = 0; |
| 311 | |
| 312 | return 0; |
| 313 | default: |
| 314 | return -ENOIOCTLCMD; |
| 315 | } |
| 316 | } |
| 317 | #else |
| 318 | #define pcf8563_rtc_ioctl NULL |
| 319 | #endif |
| 320 | |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 321 | static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm) |
| 322 | { |
| 323 | return pcf8563_get_datetime(to_i2c_client(dev), tm); |
| 324 | } |
| 325 | |
| 326 | static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm) |
| 327 | { |
| 328 | return pcf8563_set_datetime(to_i2c_client(dev), tm); |
| 329 | } |
| 330 | |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 331 | static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm) |
| 332 | { |
| 333 | struct i2c_client *client = to_i2c_client(dev); |
| 334 | unsigned char buf[4]; |
| 335 | int err; |
| 336 | |
| 337 | err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf); |
| 338 | if (err) |
| 339 | return err; |
| 340 | |
| 341 | dev_dbg(&client->dev, |
| 342 | "%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n", |
| 343 | __func__, buf[0], buf[1], buf[2], buf[3]); |
| 344 | |
| 345 | tm->time.tm_min = bcd2bin(buf[0] & 0x7F); |
Jan Kardell | c7aef4f | 2014-12-10 15:53:37 -0800 | [diff] [blame] | 346 | tm->time.tm_hour = bcd2bin(buf[1] & 0x3F); |
| 347 | tm->time.tm_mday = bcd2bin(buf[2] & 0x3F); |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 348 | tm->time.tm_wday = bcd2bin(buf[3] & 0x7); |
| 349 | tm->time.tm_mon = -1; |
| 350 | tm->time.tm_year = -1; |
| 351 | tm->time.tm_yday = -1; |
| 352 | tm->time.tm_isdst = -1; |
| 353 | |
| 354 | err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending); |
| 355 | if (err < 0) |
| 356 | return err; |
| 357 | |
| 358 | dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d," |
| 359 | " enabled=%d, pending=%d\n", __func__, tm->time.tm_min, |
| 360 | tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday, |
| 361 | tm->enabled, tm->pending); |
| 362 | |
| 363 | return 0; |
| 364 | } |
| 365 | |
| 366 | static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm) |
| 367 | { |
| 368 | struct i2c_client *client = to_i2c_client(dev); |
| 369 | unsigned char buf[4]; |
| 370 | int err; |
Jan Kardell | 599cda5 | 2014-12-10 15:53:40 -0800 | [diff] [blame] | 371 | unsigned long alarm_time; |
| 372 | |
| 373 | /* The alarm has no seconds, round up to nearest minute */ |
| 374 | if (tm->time.tm_sec) { |
| 375 | rtc_tm_to_time(&tm->time, &alarm_time); |
| 376 | alarm_time += 60-tm->time.tm_sec; |
| 377 | rtc_time_to_tm(alarm_time, &tm->time); |
| 378 | } |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 379 | |
| 380 | dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d " |
| 381 | "enabled=%d pending=%d\n", __func__, |
| 382 | tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday, |
| 383 | tm->time.tm_mday, tm->enabled, tm->pending); |
| 384 | |
| 385 | buf[0] = bin2bcd(tm->time.tm_min); |
| 386 | buf[1] = bin2bcd(tm->time.tm_hour); |
| 387 | buf[2] = bin2bcd(tm->time.tm_mday); |
| 388 | buf[3] = tm->time.tm_wday & 0x07; |
| 389 | |
| 390 | err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf); |
| 391 | if (err) |
| 392 | return err; |
| 393 | |
| 394 | return pcf8563_set_alarm_mode(client, 1); |
| 395 | } |
| 396 | |
| 397 | static int pcf8563_irq_enable(struct device *dev, unsigned int enabled) |
| 398 | { |
Jan Kardell | a45d528 | 2014-12-10 15:53:46 -0800 | [diff] [blame] | 399 | dev_dbg(dev, "%s: en=%d\n", __func__, enabled); |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 400 | return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled); |
| 401 | } |
| 402 | |
David Brownell | ff8371a | 2006-09-30 23:28:17 -0700 | [diff] [blame] | 403 | static const struct rtc_class_ops pcf8563_rtc_ops = { |
Alexander Stein | 0f20b76 | 2012-05-29 15:07:36 -0700 | [diff] [blame] | 404 | .ioctl = pcf8563_rtc_ioctl, |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 405 | .read_time = pcf8563_rtc_read_time, |
| 406 | .set_time = pcf8563_rtc_set_time, |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 407 | .read_alarm = pcf8563_rtc_read_alarm, |
| 408 | .set_alarm = pcf8563_rtc_set_alarm, |
| 409 | .alarm_irq_enable = pcf8563_irq_enable, |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 410 | }; |
| 411 | |
Jean Delvare | d2653e9 | 2008-04-29 23:11:39 +0200 | [diff] [blame] | 412 | static int pcf8563_probe(struct i2c_client *client, |
| 413 | const struct i2c_device_id *id) |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 414 | { |
Atsushi Nemoto | cbb9450 | 2007-02-08 14:20:24 -0800 | [diff] [blame] | 415 | struct pcf8563 *pcf8563; |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 416 | int err; |
Jan Kardell | ff0bc50 | 2014-12-10 15:53:43 -0800 | [diff] [blame] | 417 | unsigned char buf; |
Jan Kardell | a45d528 | 2014-12-10 15:53:46 -0800 | [diff] [blame] | 418 | unsigned char alm_pending; |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 419 | |
Alessandro Zummo | e5fc9cc | 2008-04-28 02:11:54 -0700 | [diff] [blame] | 420 | dev_dbg(&client->dev, "%s\n", __func__); |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 421 | |
Alessandro Zummo | e5fc9cc | 2008-04-28 02:11:54 -0700 | [diff] [blame] | 422 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) |
| 423 | return -ENODEV; |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 424 | |
Jingoo Han | d6fbdc3 | 2013-04-29 16:20:49 -0700 | [diff] [blame] | 425 | pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563), |
| 426 | GFP_KERNEL); |
Alessandro Zummo | e5fc9cc | 2008-04-28 02:11:54 -0700 | [diff] [blame] | 427 | if (!pcf8563) |
| 428 | return -ENOMEM; |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 429 | |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 430 | dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n"); |
| 431 | |
Alessandro Zummo | b74d2ca | 2009-12-15 16:45:53 -0800 | [diff] [blame] | 432 | i2c_set_clientdata(client, pcf8563); |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 433 | pcf8563->client = client; |
| 434 | device_set_wakeup_capable(&client->dev, 1); |
Alessandro Zummo | b74d2ca | 2009-12-15 16:45:53 -0800 | [diff] [blame] | 435 | |
Jan Kardell | ff0bc50 | 2014-12-10 15:53:43 -0800 | [diff] [blame] | 436 | /* Set timer to lowest frequency to save power (ref Haoyu datasheet) */ |
| 437 | buf = PCF8563_TMRC_1_60; |
| 438 | err = pcf8563_write_block_data(client, PCF8563_REG_TMRC, 1, &buf); |
| 439 | if (err < 0) { |
| 440 | dev_err(&client->dev, "%s: write error\n", __func__); |
| 441 | return err; |
| 442 | } |
| 443 | |
Jan Kardell | a45d528 | 2014-12-10 15:53:46 -0800 | [diff] [blame] | 444 | err = pcf8563_get_alarm_mode(client, NULL, &alm_pending); |
| 445 | if (err < 0) { |
| 446 | dev_err(&client->dev, "%s: read error\n", __func__); |
| 447 | return err; |
| 448 | } |
| 449 | if (alm_pending) |
| 450 | pcf8563_set_alarm_mode(client, 0); |
| 451 | |
Jingoo Han | d6fbdc3 | 2013-04-29 16:20:49 -0700 | [diff] [blame] | 452 | pcf8563->rtc = devm_rtc_device_register(&client->dev, |
| 453 | pcf8563_driver.driver.name, |
| 454 | &pcf8563_rtc_ops, THIS_MODULE); |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 455 | |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 456 | if (IS_ERR(pcf8563->rtc)) |
| 457 | return PTR_ERR(pcf8563->rtc); |
| 458 | |
| 459 | if (client->irq > 0) { |
| 460 | err = devm_request_threaded_irq(&client->dev, client->irq, |
| 461 | NULL, pcf8563_irq, |
| 462 | IRQF_SHARED|IRQF_ONESHOT|IRQF_TRIGGER_FALLING, |
| 463 | pcf8563->rtc->name, client); |
| 464 | if (err) { |
| 465 | dev_err(&client->dev, "unable to request IRQ %d\n", |
| 466 | client->irq); |
| 467 | return err; |
| 468 | } |
| 469 | |
| 470 | } |
| 471 | |
Jan Kardell | 599cda5 | 2014-12-10 15:53:40 -0800 | [diff] [blame] | 472 | /* the pcf8563 alarm only supports a minute accuracy */ |
| 473 | pcf8563->rtc->uie_unsupported = 1; |
| 474 | |
Vincent Donnefort | ede3e9d | 2014-08-08 14:20:18 -0700 | [diff] [blame] | 475 | return 0; |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 476 | } |
| 477 | |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 478 | static const struct i2c_device_id pcf8563_id[] = { |
| 479 | { "pcf8563", 0 }, |
Jon Smirl | 8ea9212 | 2008-07-12 13:47:56 -0700 | [diff] [blame] | 480 | { "rtc8564", 0 }, |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 481 | { } |
| 482 | }; |
| 483 | MODULE_DEVICE_TABLE(i2c, pcf8563_id); |
| 484 | |
Nick Bowler | 8dccaf0 | 2012-07-30 14:41:59 -0700 | [diff] [blame] | 485 | #ifdef CONFIG_OF |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 486 | static const struct of_device_id pcf8563_of_match[] = { |
Nick Bowler | 8dccaf0 | 2012-07-30 14:41:59 -0700 | [diff] [blame] | 487 | { .compatible = "nxp,pcf8563" }, |
| 488 | {} |
| 489 | }; |
| 490 | MODULE_DEVICE_TABLE(of, pcf8563_of_match); |
| 491 | #endif |
| 492 | |
Alessandro Zummo | e5fc9cc | 2008-04-28 02:11:54 -0700 | [diff] [blame] | 493 | static struct i2c_driver pcf8563_driver = { |
| 494 | .driver = { |
| 495 | .name = "rtc-pcf8563", |
Nick Bowler | 0a25bf4 | 2012-07-30 14:41:57 -0700 | [diff] [blame] | 496 | .owner = THIS_MODULE, |
Nick Bowler | 8dccaf0 | 2012-07-30 14:41:59 -0700 | [diff] [blame] | 497 | .of_match_table = of_match_ptr(pcf8563_of_match), |
Alessandro Zummo | e5fc9cc | 2008-04-28 02:11:54 -0700 | [diff] [blame] | 498 | }, |
| 499 | .probe = pcf8563_probe, |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 500 | .id_table = pcf8563_id, |
Alessandro Zummo | e5fc9cc | 2008-04-28 02:11:54 -0700 | [diff] [blame] | 501 | }; |
| 502 | |
Axel Lin | 0abc920 | 2012-03-23 15:02:31 -0700 | [diff] [blame] | 503 | module_i2c_driver(pcf8563_driver); |
Alessandro Zummo | b5a82d6 | 2006-03-27 01:16:44 -0800 | [diff] [blame] | 504 | |
| 505 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); |
| 506 | MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver"); |
| 507 | MODULE_LICENSE("GPL"); |
| 508 | MODULE_VERSION(DRV_VERSION); |