Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 1 | /* |
| 2 | * rtc-fm3130.c - RTC driver for Ramtron FM3130 I2C chip. |
| 3 | * |
| 4 | * Copyright (C) 2008 Sergey Lapin |
| 5 | * Based on ds1307 driver by James Chapman and David Brownell |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/i2c.h> |
| 14 | #include <linux/rtc.h> |
| 15 | #include <linux/bcd.h> |
| 16 | |
| 17 | #define FM3130_RTC_CONTROL (0x0) |
| 18 | #define FM3130_CAL_CONTROL (0x1) |
| 19 | #define FM3130_RTC_SECONDS (0x2) |
| 20 | #define FM3130_RTC_MINUTES (0x3) |
| 21 | #define FM3130_RTC_HOURS (0x4) |
| 22 | #define FM3130_RTC_DAY (0x5) |
| 23 | #define FM3130_RTC_DATE (0x6) |
| 24 | #define FM3130_RTC_MONTHS (0x7) |
| 25 | #define FM3130_RTC_YEARS (0x8) |
| 26 | |
| 27 | #define FM3130_ALARM_SECONDS (0x9) |
| 28 | #define FM3130_ALARM_MINUTES (0xa) |
| 29 | #define FM3130_ALARM_HOURS (0xb) |
| 30 | #define FM3130_ALARM_DATE (0xc) |
| 31 | #define FM3130_ALARM_MONTHS (0xd) |
| 32 | #define FM3130_ALARM_WP_CONTROL (0xe) |
| 33 | |
| 34 | #define FM3130_CAL_CONTROL_BIT_nOSCEN (1 << 7) /* Osciallator enabled */ |
| 35 | #define FM3130_RTC_CONTROL_BIT_LB (1 << 7) /* Low battery */ |
| 36 | #define FM3130_RTC_CONTROL_BIT_AF (1 << 6) /* Alarm flag */ |
| 37 | #define FM3130_RTC_CONTROL_BIT_CF (1 << 5) /* Century overflow */ |
| 38 | #define FM3130_RTC_CONTROL_BIT_POR (1 << 4) /* Power on reset */ |
| 39 | #define FM3130_RTC_CONTROL_BIT_AEN (1 << 3) /* Alarm enable */ |
| 40 | #define FM3130_RTC_CONTROL_BIT_CAL (1 << 2) /* Calibration mode */ |
| 41 | #define FM3130_RTC_CONTROL_BIT_WRITE (1 << 1) /* W=1 -> write mode W=0 normal */ |
| 42 | #define FM3130_RTC_CONTROL_BIT_READ (1 << 0) /* R=1 -> read mode R=0 normal */ |
| 43 | |
| 44 | #define FM3130_CLOCK_REGS 7 |
| 45 | #define FM3130_ALARM_REGS 5 |
| 46 | |
| 47 | struct fm3130 { |
| 48 | u8 reg_addr_time; |
| 49 | u8 reg_addr_alarm; |
| 50 | u8 regs[15]; |
| 51 | struct i2c_msg msg[4]; |
| 52 | struct i2c_client *client; |
| 53 | struct rtc_device *rtc; |
| 54 | int data_valid; |
| 55 | int alarm; |
| 56 | }; |
| 57 | static const struct i2c_device_id fm3130_id[] = { |
Alessandro Zummo | 876550a | 2008-07-12 13:47:55 -0700 | [diff] [blame] | 58 | { "fm3130", 0 }, |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 59 | { } |
| 60 | }; |
| 61 | MODULE_DEVICE_TABLE(i2c, fm3130_id); |
| 62 | |
| 63 | #define FM3130_MODE_NORMAL 0 |
| 64 | #define FM3130_MODE_WRITE 1 |
| 65 | #define FM3130_MODE_READ 2 |
| 66 | |
| 67 | static void fm3130_rtc_mode(struct device *dev, int mode) |
| 68 | { |
| 69 | struct fm3130 *fm3130 = dev_get_drvdata(dev); |
| 70 | |
| 71 | fm3130->regs[FM3130_RTC_CONTROL] = |
| 72 | i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL); |
| 73 | switch (mode) { |
| 74 | case FM3130_MODE_NORMAL: |
| 75 | fm3130->regs[FM3130_RTC_CONTROL] &= |
| 76 | ~(FM3130_RTC_CONTROL_BIT_WRITE | |
| 77 | FM3130_RTC_CONTROL_BIT_READ); |
| 78 | break; |
| 79 | case FM3130_MODE_WRITE: |
| 80 | fm3130->regs[FM3130_RTC_CONTROL] |= FM3130_RTC_CONTROL_BIT_WRITE; |
| 81 | break; |
| 82 | case FM3130_MODE_READ: |
| 83 | fm3130->regs[FM3130_RTC_CONTROL] |= FM3130_RTC_CONTROL_BIT_READ; |
| 84 | break; |
| 85 | default: |
| 86 | dev_dbg(dev, "invalid mode %d\n", mode); |
| 87 | break; |
| 88 | } |
| 89 | /* Checking for alarm */ |
| 90 | if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_AF) { |
| 91 | fm3130->alarm = 1; |
| 92 | fm3130->regs[FM3130_RTC_CONTROL] &= ~FM3130_RTC_CONTROL_BIT_AF; |
| 93 | } |
| 94 | i2c_smbus_write_byte_data(fm3130->client, |
| 95 | FM3130_RTC_CONTROL, fm3130->regs[FM3130_RTC_CONTROL]); |
| 96 | } |
| 97 | |
| 98 | static int fm3130_get_time(struct device *dev, struct rtc_time *t) |
| 99 | { |
| 100 | struct fm3130 *fm3130 = dev_get_drvdata(dev); |
| 101 | int tmp; |
| 102 | |
| 103 | if (!fm3130->data_valid) { |
| 104 | /* We have invalid data in RTC, probably due |
| 105 | to battery faults or other problems. Return EIO |
| 106 | for now, it will allow us to set data later insted |
| 107 | of error during probing which disables device */ |
| 108 | return -EIO; |
| 109 | } |
| 110 | fm3130_rtc_mode(dev, FM3130_MODE_READ); |
| 111 | |
| 112 | /* read the RTC date and time registers all at once */ |
| 113 | tmp = i2c_transfer(to_i2c_adapter(fm3130->client->dev.parent), |
| 114 | fm3130->msg, 2); |
| 115 | if (tmp != 2) { |
| 116 | dev_err(dev, "%s error %d\n", "read", tmp); |
| 117 | return -EIO; |
| 118 | } |
| 119 | |
| 120 | fm3130_rtc_mode(dev, FM3130_MODE_NORMAL); |
| 121 | |
| 122 | dev_dbg(dev, "%s: %02x %02x %02x %02x %02x %02x %02x %02x" |
| 123 | "%02x %02x %02x %02x %02x %02x %02x\n", |
| 124 | "read", |
| 125 | fm3130->regs[0], fm3130->regs[1], |
| 126 | fm3130->regs[2], fm3130->regs[3], |
| 127 | fm3130->regs[4], fm3130->regs[5], |
| 128 | fm3130->regs[6], fm3130->regs[7], |
| 129 | fm3130->regs[8], fm3130->regs[9], |
| 130 | fm3130->regs[0xa], fm3130->regs[0xb], |
| 131 | fm3130->regs[0xc], fm3130->regs[0xd], |
| 132 | fm3130->regs[0xe]); |
| 133 | |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 134 | t->tm_sec = bcd2bin(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f); |
| 135 | t->tm_min = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f); |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 136 | tmp = fm3130->regs[FM3130_RTC_HOURS] & 0x3f; |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 137 | t->tm_hour = bcd2bin(tmp); |
| 138 | t->tm_wday = bcd2bin(fm3130->regs[FM3130_RTC_DAY] & 0x07) - 1; |
| 139 | t->tm_mday = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f); |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 140 | tmp = fm3130->regs[FM3130_RTC_MONTHS] & 0x1f; |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 141 | t->tm_mon = bcd2bin(tmp) - 1; |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 142 | |
| 143 | /* assume 20YY not 19YY, and ignore CF bit */ |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 144 | t->tm_year = bcd2bin(fm3130->regs[FM3130_RTC_YEARS]) + 100; |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 145 | |
| 146 | dev_dbg(dev, "%s secs=%d, mins=%d, " |
| 147 | "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", |
| 148 | "read", t->tm_sec, t->tm_min, |
| 149 | t->tm_hour, t->tm_mday, |
| 150 | t->tm_mon, t->tm_year, t->tm_wday); |
| 151 | |
| 152 | /* initial clock setting can be undefined */ |
| 153 | return rtc_valid_tm(t); |
| 154 | } |
| 155 | |
| 156 | |
| 157 | static int fm3130_set_time(struct device *dev, struct rtc_time *t) |
| 158 | { |
| 159 | struct fm3130 *fm3130 = dev_get_drvdata(dev); |
| 160 | int tmp, i; |
| 161 | u8 *buf = fm3130->regs; |
| 162 | |
| 163 | dev_dbg(dev, "%s secs=%d, mins=%d, " |
| 164 | "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", |
| 165 | "write", t->tm_sec, t->tm_min, |
| 166 | t->tm_hour, t->tm_mday, |
| 167 | t->tm_mon, t->tm_year, t->tm_wday); |
| 168 | |
| 169 | /* first register addr */ |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 170 | buf[FM3130_RTC_SECONDS] = bin2bcd(t->tm_sec); |
| 171 | buf[FM3130_RTC_MINUTES] = bin2bcd(t->tm_min); |
| 172 | buf[FM3130_RTC_HOURS] = bin2bcd(t->tm_hour); |
| 173 | buf[FM3130_RTC_DAY] = bin2bcd(t->tm_wday + 1); |
| 174 | buf[FM3130_RTC_DATE] = bin2bcd(t->tm_mday); |
| 175 | buf[FM3130_RTC_MONTHS] = bin2bcd(t->tm_mon + 1); |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 176 | |
| 177 | /* assume 20YY not 19YY */ |
| 178 | tmp = t->tm_year - 100; |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 179 | buf[FM3130_RTC_YEARS] = bin2bcd(tmp); |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 180 | |
| 181 | dev_dbg(dev, "%s: %02x %02x %02x %02x %02x %02x %02x" |
| 182 | "%02x %02x %02x %02x %02x %02x %02x %02x\n", |
| 183 | "write", buf[0], buf[1], buf[2], buf[3], |
| 184 | buf[4], buf[5], buf[6], buf[7], |
| 185 | buf[8], buf[9], buf[0xa], buf[0xb], |
| 186 | buf[0xc], buf[0xd], buf[0xe]); |
| 187 | |
| 188 | fm3130_rtc_mode(dev, FM3130_MODE_WRITE); |
| 189 | |
| 190 | /* Writing time registers, we don't support multibyte transfers */ |
| 191 | for (i = 0; i < FM3130_CLOCK_REGS; i++) { |
| 192 | i2c_smbus_write_byte_data(fm3130->client, |
| 193 | FM3130_RTC_SECONDS + i, |
| 194 | fm3130->regs[FM3130_RTC_SECONDS + i]); |
| 195 | } |
| 196 | |
| 197 | fm3130_rtc_mode(dev, FM3130_MODE_NORMAL); |
| 198 | |
| 199 | /* We assume here that data are valid once written */ |
| 200 | if (!fm3130->data_valid) |
| 201 | fm3130->data_valid = 1; |
| 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | static int fm3130_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 206 | { |
| 207 | struct fm3130 *fm3130 = dev_get_drvdata(dev); |
| 208 | int tmp; |
| 209 | struct rtc_time *tm = &alrm->time; |
| 210 | /* read the RTC alarm registers all at once */ |
| 211 | tmp = i2c_transfer(to_i2c_adapter(fm3130->client->dev.parent), |
| 212 | &fm3130->msg[2], 2); |
| 213 | if (tmp != 2) { |
| 214 | dev_err(dev, "%s error %d\n", "read", tmp); |
| 215 | return -EIO; |
| 216 | } |
| 217 | dev_dbg(dev, "alarm read %02x %02x %02x %02x %02x\n", |
| 218 | fm3130->regs[FM3130_ALARM_SECONDS], |
| 219 | fm3130->regs[FM3130_ALARM_MINUTES], |
| 220 | fm3130->regs[FM3130_ALARM_HOURS], |
| 221 | fm3130->regs[FM3130_ALARM_DATE], |
| 222 | fm3130->regs[FM3130_ALARM_MONTHS]); |
| 223 | |
| 224 | |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 225 | tm->tm_sec = bcd2bin(fm3130->regs[FM3130_ALARM_SECONDS] & 0x7F); |
| 226 | tm->tm_min = bcd2bin(fm3130->regs[FM3130_ALARM_MINUTES] & 0x7F); |
| 227 | tm->tm_hour = bcd2bin(fm3130->regs[FM3130_ALARM_HOURS] & 0x3F); |
| 228 | tm->tm_mday = bcd2bin(fm3130->regs[FM3130_ALARM_DATE] & 0x3F); |
| 229 | tm->tm_mon = bcd2bin(fm3130->regs[FM3130_ALARM_MONTHS] & 0x1F); |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 230 | if (tm->tm_mon > 0) |
| 231 | tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */ |
| 232 | dev_dbg(dev, "%s secs=%d, mins=%d, " |
| 233 | "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", |
| 234 | "read alarm", tm->tm_sec, tm->tm_min, |
| 235 | tm->tm_hour, tm->tm_mday, |
| 236 | tm->tm_mon, tm->tm_year, tm->tm_wday); |
| 237 | |
| 238 | return 0; |
| 239 | } |
| 240 | |
| 241 | static int fm3130_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 242 | { |
| 243 | struct fm3130 *fm3130 = dev_get_drvdata(dev); |
| 244 | struct rtc_time *tm = &alrm->time; |
| 245 | int i; |
| 246 | |
| 247 | dev_dbg(dev, "%s secs=%d, mins=%d, " |
| 248 | "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", |
| 249 | "write alarm", tm->tm_sec, tm->tm_min, |
| 250 | tm->tm_hour, tm->tm_mday, |
| 251 | tm->tm_mon, tm->tm_year, tm->tm_wday); |
| 252 | |
| 253 | if (tm->tm_sec != -1) |
| 254 | fm3130->regs[FM3130_ALARM_SECONDS] = |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 255 | bin2bcd(tm->tm_sec) | 0x80; |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 256 | |
| 257 | if (tm->tm_min != -1) |
| 258 | fm3130->regs[FM3130_ALARM_MINUTES] = |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 259 | bin2bcd(tm->tm_min) | 0x80; |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 260 | |
| 261 | if (tm->tm_hour != -1) |
| 262 | fm3130->regs[FM3130_ALARM_HOURS] = |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 263 | bin2bcd(tm->tm_hour) | 0x80; |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 264 | |
| 265 | if (tm->tm_mday != -1) |
| 266 | fm3130->regs[FM3130_ALARM_DATE] = |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 267 | bin2bcd(tm->tm_mday) | 0x80; |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 268 | |
| 269 | if (tm->tm_mon != -1) |
| 270 | fm3130->regs[FM3130_ALARM_MONTHS] = |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 271 | bin2bcd(tm->tm_mon + 1) | 0x80; |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 272 | |
| 273 | dev_dbg(dev, "alarm write %02x %02x %02x %02x %02x\n", |
| 274 | fm3130->regs[FM3130_ALARM_SECONDS], |
| 275 | fm3130->regs[FM3130_ALARM_MINUTES], |
| 276 | fm3130->regs[FM3130_ALARM_HOURS], |
| 277 | fm3130->regs[FM3130_ALARM_DATE], |
| 278 | fm3130->regs[FM3130_ALARM_MONTHS]); |
| 279 | /* Writing time registers, we don't support multibyte transfers */ |
| 280 | for (i = 0; i < FM3130_ALARM_REGS; i++) { |
| 281 | i2c_smbus_write_byte_data(fm3130->client, |
| 282 | FM3130_ALARM_SECONDS + i, |
| 283 | fm3130->regs[FM3130_ALARM_SECONDS + i]); |
| 284 | } |
| 285 | fm3130->regs[FM3130_RTC_CONTROL] = |
| 286 | i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL); |
| 287 | /* Checking for alarm */ |
| 288 | if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_AF) { |
| 289 | fm3130->alarm = 1; |
| 290 | fm3130->regs[FM3130_RTC_CONTROL] &= ~FM3130_RTC_CONTROL_BIT_AF; |
| 291 | } |
| 292 | if (alrm->enabled) { |
| 293 | i2c_smbus_write_byte_data(fm3130->client, FM3130_RTC_CONTROL, |
| 294 | (fm3130->regs[FM3130_RTC_CONTROL] & |
| 295 | ~(FM3130_RTC_CONTROL_BIT_CAL)) | |
| 296 | FM3130_RTC_CONTROL_BIT_AEN); |
| 297 | } else { |
| 298 | i2c_smbus_write_byte_data(fm3130->client, FM3130_RTC_CONTROL, |
| 299 | fm3130->regs[FM3130_RTC_CONTROL] & |
| 300 | ~(FM3130_RTC_CONTROL_BIT_AEN)); |
| 301 | } |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | static const struct rtc_class_ops fm3130_rtc_ops = { |
| 306 | .read_time = fm3130_get_time, |
| 307 | .set_time = fm3130_set_time, |
| 308 | .read_alarm = fm3130_read_alarm, |
| 309 | .set_alarm = fm3130_set_alarm, |
| 310 | }; |
| 311 | |
| 312 | static struct i2c_driver fm3130_driver; |
| 313 | |
| 314 | static int __devinit fm3130_probe(struct i2c_client *client, |
| 315 | const struct i2c_device_id *id) |
| 316 | { |
| 317 | struct fm3130 *fm3130; |
| 318 | int err = -ENODEV; |
| 319 | int tmp; |
| 320 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); |
| 321 | |
| 322 | if (!i2c_check_functionality(adapter, |
| 323 | I2C_FUNC_I2C | I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) |
| 324 | return -EIO; |
| 325 | |
| 326 | fm3130 = kzalloc(sizeof(struct fm3130), GFP_KERNEL); |
| 327 | |
| 328 | if (!fm3130) |
| 329 | return -ENOMEM; |
| 330 | |
| 331 | fm3130->client = client; |
| 332 | i2c_set_clientdata(client, fm3130); |
| 333 | fm3130->reg_addr_time = FM3130_RTC_SECONDS; |
| 334 | fm3130->reg_addr_alarm = FM3130_ALARM_SECONDS; |
| 335 | |
| 336 | /* Messages to read time */ |
| 337 | fm3130->msg[0].addr = client->addr; |
| 338 | fm3130->msg[0].flags = 0; |
| 339 | fm3130->msg[0].len = 1; |
| 340 | fm3130->msg[0].buf = &fm3130->reg_addr_time; |
| 341 | |
| 342 | fm3130->msg[1].addr = client->addr; |
| 343 | fm3130->msg[1].flags = I2C_M_RD; |
| 344 | fm3130->msg[1].len = FM3130_CLOCK_REGS; |
| 345 | fm3130->msg[1].buf = &fm3130->regs[FM3130_RTC_SECONDS]; |
| 346 | |
| 347 | /* Messages to read alarm */ |
| 348 | fm3130->msg[2].addr = client->addr; |
| 349 | fm3130->msg[2].flags = 0; |
| 350 | fm3130->msg[2].len = 1; |
| 351 | fm3130->msg[2].buf = &fm3130->reg_addr_alarm; |
| 352 | |
| 353 | fm3130->msg[3].addr = client->addr; |
| 354 | fm3130->msg[3].flags = I2C_M_RD; |
| 355 | fm3130->msg[3].len = FM3130_ALARM_REGS; |
| 356 | fm3130->msg[3].buf = &fm3130->regs[FM3130_ALARM_SECONDS]; |
| 357 | |
| 358 | fm3130->data_valid = 0; |
| 359 | |
| 360 | tmp = i2c_transfer(adapter, fm3130->msg, 4); |
| 361 | if (tmp != 4) { |
| 362 | pr_debug("read error %d\n", tmp); |
| 363 | err = -EIO; |
| 364 | goto exit_free; |
| 365 | } |
| 366 | |
| 367 | fm3130->regs[FM3130_RTC_CONTROL] = |
| 368 | i2c_smbus_read_byte_data(client, FM3130_RTC_CONTROL); |
| 369 | fm3130->regs[FM3130_CAL_CONTROL] = |
| 370 | i2c_smbus_read_byte_data(client, FM3130_CAL_CONTROL); |
| 371 | |
| 372 | /* Checking for alarm */ |
| 373 | if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_AF) { |
| 374 | fm3130->alarm = 1; |
| 375 | fm3130->regs[FM3130_RTC_CONTROL] &= ~FM3130_RTC_CONTROL_BIT_AF; |
| 376 | } |
| 377 | |
| 378 | /* Disabling calibration mode */ |
Sergey Matyukevich | f4b5162 | 2010-02-02 13:43:59 -0800 | [diff] [blame] | 379 | if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_CAL) { |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 380 | i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL, |
| 381 | fm3130->regs[FM3130_RTC_CONTROL] & |
| 382 | ~(FM3130_RTC_CONTROL_BIT_CAL)); |
| 383 | dev_warn(&client->dev, "Disabling calibration mode!\n"); |
Sergey Matyukevich | f4b5162 | 2010-02-02 13:43:59 -0800 | [diff] [blame] | 384 | } |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 385 | |
| 386 | /* Disabling read and write modes */ |
| 387 | if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_WRITE || |
Sergey Matyukevich | f4b5162 | 2010-02-02 13:43:59 -0800 | [diff] [blame] | 388 | fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_READ) { |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 389 | i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL, |
| 390 | fm3130->regs[FM3130_RTC_CONTROL] & |
| 391 | ~(FM3130_RTC_CONTROL_BIT_READ | |
| 392 | FM3130_RTC_CONTROL_BIT_WRITE)); |
| 393 | dev_warn(&client->dev, "Disabling READ or WRITE mode!\n"); |
Sergey Matyukevich | f4b5162 | 2010-02-02 13:43:59 -0800 | [diff] [blame] | 394 | } |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 395 | |
| 396 | /* oscillator off? turn it on, so clock can tick. */ |
| 397 | if (fm3130->regs[FM3130_CAL_CONTROL] & FM3130_CAL_CONTROL_BIT_nOSCEN) |
| 398 | i2c_smbus_write_byte_data(client, FM3130_CAL_CONTROL, |
| 399 | fm3130->regs[FM3130_CAL_CONTROL] & |
| 400 | ~(FM3130_CAL_CONTROL_BIT_nOSCEN)); |
| 401 | |
| 402 | /* oscillator fault? clear flag, and warn */ |
| 403 | if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_LB) |
| 404 | dev_warn(&client->dev, "Low battery!\n"); |
| 405 | |
| 406 | /* oscillator fault? clear flag, and warn */ |
| 407 | if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_POR) { |
| 408 | i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL, |
| 409 | fm3130->regs[FM3130_RTC_CONTROL] & |
| 410 | ~FM3130_RTC_CONTROL_BIT_POR); |
| 411 | dev_warn(&client->dev, "SET TIME!\n"); |
| 412 | } |
| 413 | /* ACS is controlled by alarm */ |
| 414 | i2c_smbus_write_byte_data(client, FM3130_ALARM_WP_CONTROL, 0x80); |
| 415 | |
| 416 | /* TODO */ |
| 417 | /* TODO need to sanity check alarm */ |
| 418 | tmp = fm3130->regs[FM3130_RTC_SECONDS]; |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 419 | tmp = bcd2bin(tmp & 0x7f); |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 420 | if (tmp > 60) |
| 421 | goto exit_bad; |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 422 | tmp = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f); |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 423 | if (tmp > 60) |
| 424 | goto exit_bad; |
| 425 | |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 426 | tmp = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f); |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 427 | if (tmp == 0 || tmp > 31) |
| 428 | goto exit_bad; |
| 429 | |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 430 | tmp = bcd2bin(fm3130->regs[FM3130_RTC_MONTHS] & 0x1f); |
Sergey Lapin | c6d8f40 | 2008-06-12 15:21:55 -0700 | [diff] [blame] | 431 | if (tmp == 0 || tmp > 12) |
| 432 | goto exit_bad; |
| 433 | |
| 434 | tmp = fm3130->regs[FM3130_RTC_HOURS]; |
| 435 | |
| 436 | fm3130->data_valid = 1; |
| 437 | |
| 438 | exit_bad: |
| 439 | if (!fm3130->data_valid) |
| 440 | dev_dbg(&client->dev, |
| 441 | "%s: %02x %02x %02x %02x %02x %02x %02x %02x" |
| 442 | "%02x %02x %02x %02x %02x %02x %02x\n", |
| 443 | "bogus registers", |
| 444 | fm3130->regs[0], fm3130->regs[1], |
| 445 | fm3130->regs[2], fm3130->regs[3], |
| 446 | fm3130->regs[4], fm3130->regs[5], |
| 447 | fm3130->regs[6], fm3130->regs[7], |
| 448 | fm3130->regs[8], fm3130->regs[9], |
| 449 | fm3130->regs[0xa], fm3130->regs[0xb], |
| 450 | fm3130->regs[0xc], fm3130->regs[0xd], |
| 451 | fm3130->regs[0xe]); |
| 452 | |
| 453 | /* We won't bail out here because we just got invalid data. |
| 454 | Time setting from u-boot doesn't work anyway */ |
| 455 | fm3130->rtc = rtc_device_register(client->name, &client->dev, |
| 456 | &fm3130_rtc_ops, THIS_MODULE); |
| 457 | if (IS_ERR(fm3130->rtc)) { |
| 458 | err = PTR_ERR(fm3130->rtc); |
| 459 | dev_err(&client->dev, |
| 460 | "unable to register the class device\n"); |
| 461 | goto exit_free; |
| 462 | } |
| 463 | return 0; |
| 464 | exit_free: |
| 465 | kfree(fm3130); |
| 466 | return err; |
| 467 | } |
| 468 | |
| 469 | static int __devexit fm3130_remove(struct i2c_client *client) |
| 470 | { |
| 471 | struct fm3130 *fm3130 = i2c_get_clientdata(client); |
| 472 | |
| 473 | rtc_device_unregister(fm3130->rtc); |
| 474 | kfree(fm3130); |
| 475 | return 0; |
| 476 | } |
| 477 | |
| 478 | static struct i2c_driver fm3130_driver = { |
| 479 | .driver = { |
| 480 | .name = "rtc-fm3130", |
| 481 | .owner = THIS_MODULE, |
| 482 | }, |
| 483 | .probe = fm3130_probe, |
| 484 | .remove = __devexit_p(fm3130_remove), |
| 485 | .id_table = fm3130_id, |
| 486 | }; |
| 487 | |
| 488 | static int __init fm3130_init(void) |
| 489 | { |
| 490 | return i2c_add_driver(&fm3130_driver); |
| 491 | } |
| 492 | module_init(fm3130_init); |
| 493 | |
| 494 | static void __exit fm3130_exit(void) |
| 495 | { |
| 496 | i2c_del_driver(&fm3130_driver); |
| 497 | } |
| 498 | module_exit(fm3130_exit); |
| 499 | |
| 500 | MODULE_DESCRIPTION("RTC driver for FM3130"); |
| 501 | MODULE_AUTHOR("Sergey Lapin <slapin@ossfans.org>"); |
| 502 | MODULE_LICENSE("GPL"); |
| 503 | |