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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 | // SPDX-License-Identifier: GPL-2.0-only /* * Driver for the Epson RTC module RX-8010 SJ * * Copyright(C) Timesys Corporation 2015 * Copyright(C) General Electric Company 2015 */ #include <linux/bcd.h> #include <linux/bitops.h> #include <linux/i2c.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/regmap.h> #include <linux/rtc.h> #define RX8010_SEC 0x10 #define RX8010_MIN 0x11 #define RX8010_HOUR 0x12 #define RX8010_WDAY 0x13 #define RX8010_MDAY 0x14 #define RX8010_MONTH 0x15 #define RX8010_YEAR 0x16 #define RX8010_RESV17 0x17 #define RX8010_ALMIN 0x18 #define RX8010_ALHOUR 0x19 #define RX8010_ALWDAY 0x1A #define RX8010_TCOUNT0 0x1B #define RX8010_TCOUNT1 0x1C #define RX8010_EXT 0x1D #define RX8010_FLAG 0x1E #define RX8010_CTRL 0x1F /* 0x20 to 0x2F are user registers */ #define RX8010_RESV30 0x30 #define RX8010_RESV31 0x31 #define RX8010_IRQ 0x32 #define RX8010_EXT_WADA BIT(3) #define RX8010_FLAG_VLF BIT(1) #define RX8010_FLAG_AF BIT(3) #define RX8010_FLAG_TF BIT(4) #define RX8010_FLAG_UF BIT(5) #define RX8010_CTRL_AIE BIT(3) #define RX8010_CTRL_UIE BIT(5) #define RX8010_CTRL_STOP BIT(6) #define RX8010_CTRL_TEST BIT(7) #define RX8010_ALARM_AE BIT(7) static const struct i2c_device_id rx8010_id[] = { { "rx8010", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, rx8010_id); static const __maybe_unused struct of_device_id rx8010_of_match[] = { { .compatible = "epson,rx8010" }, { } }; MODULE_DEVICE_TABLE(of, rx8010_of_match); struct rx8010_data { struct regmap *regs; struct rtc_device *rtc; u8 ctrlreg; }; static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id) { struct i2c_client *client = dev_id; struct rx8010_data *rx8010 = i2c_get_clientdata(client); int flagreg, err; rtc_lock(rx8010->rtc); err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg); if (err) { rtc_unlock(rx8010->rtc); return IRQ_NONE; } if (flagreg & RX8010_FLAG_VLF) dev_warn(&client->dev, "Frequency stop detected\n"); if (flagreg & RX8010_FLAG_TF) { flagreg &= ~RX8010_FLAG_TF; rtc_update_irq(rx8010->rtc, 1, RTC_PF | RTC_IRQF); } if (flagreg & RX8010_FLAG_AF) { flagreg &= ~RX8010_FLAG_AF; rtc_update_irq(rx8010->rtc, 1, RTC_AF | RTC_IRQF); } if (flagreg & RX8010_FLAG_UF) { flagreg &= ~RX8010_FLAG_UF; rtc_update_irq(rx8010->rtc, 1, RTC_UF | RTC_IRQF); } err = regmap_write(rx8010->regs, RX8010_FLAG, flagreg); rtc_unlock(rx8010->rtc); return err ? IRQ_NONE : IRQ_HANDLED; } static int rx8010_get_time(struct device *dev, struct rtc_time *dt) { struct rx8010_data *rx8010 = dev_get_drvdata(dev); u8 date[RX8010_YEAR - RX8010_SEC + 1]; int flagreg, err; err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg); if (err) return err; if (flagreg & RX8010_FLAG_VLF) { dev_warn(dev, "Frequency stop detected\n"); return -EINVAL; } err = regmap_bulk_read(rx8010->regs, RX8010_SEC, date, sizeof(date)); if (err) return err; dt->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f); dt->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f); dt->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f); dt->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f); dt->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f) - 1; dt->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 100; dt->tm_wday = ffs(date[RX8010_WDAY - RX8010_SEC] & 0x7f); return 0; } static int rx8010_set_time(struct device *dev, struct rtc_time *dt) { struct rx8010_data *rx8010 = dev_get_drvdata(dev); u8 date[RX8010_YEAR - RX8010_SEC + 1]; int err; /* set STOP bit before changing clock/calendar */ err = regmap_set_bits(rx8010->regs, RX8010_CTRL, RX8010_CTRL_STOP); if (err) return err; date[RX8010_SEC - RX8010_SEC] = bin2bcd(dt->tm_sec); date[RX8010_MIN - RX8010_SEC] = bin2bcd(dt->tm_min); date[RX8010_HOUR - RX8010_SEC] = bin2bcd(dt->tm_hour); date[RX8010_MDAY - RX8010_SEC] = bin2bcd(dt->tm_mday); date[RX8010_MONTH - RX8010_SEC] = bin2bcd(dt->tm_mon + 1); date[RX8010_YEAR - RX8010_SEC] = bin2bcd(dt->tm_year - 100); date[RX8010_WDAY - RX8010_SEC] = bin2bcd(1 << dt->tm_wday); err = regmap_bulk_write(rx8010->regs, RX8010_SEC, date, sizeof(date)); if (err) return err; /* clear STOP bit after changing clock/calendar */ err = regmap_clear_bits(rx8010->regs, RX8010_CTRL, RX8010_CTRL_STOP); if (err) return err; err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_VLF); if (err) return err; return 0; } static int rx8010_init(struct device *dev) { struct rx8010_data *rx8010 = dev_get_drvdata(dev); u8 ctrl[2]; int need_clear = 0, err; /* Initialize reserved registers as specified in datasheet */ err = regmap_write(rx8010->regs, RX8010_RESV17, 0xD8); if (err) return err; err = regmap_write(rx8010->regs, RX8010_RESV30, 0x00); if (err) return err; err = regmap_write(rx8010->regs, RX8010_RESV31, 0x08); if (err) return err; err = regmap_write(rx8010->regs, RX8010_IRQ, 0x00); if (err) return err; err = regmap_bulk_read(rx8010->regs, RX8010_FLAG, ctrl, 2); if (err) return err; if (ctrl[0] & RX8010_FLAG_VLF) dev_warn(dev, "Frequency stop was detected\n"); if (ctrl[0] & RX8010_FLAG_AF) { dev_warn(dev, "Alarm was detected\n"); need_clear = 1; } if (ctrl[0] & RX8010_FLAG_TF) need_clear = 1; if (ctrl[0] & RX8010_FLAG_UF) need_clear = 1; if (need_clear) { ctrl[0] &= ~(RX8010_FLAG_AF | RX8010_FLAG_TF | RX8010_FLAG_UF); err = regmap_write(rx8010->regs, RX8010_FLAG, ctrl[0]); if (err) return err; } rx8010->ctrlreg = (ctrl[1] & ~RX8010_CTRL_TEST); return 0; } static int rx8010_read_alarm(struct device *dev, struct rtc_wkalrm *t) { struct rx8010_data *rx8010 = dev_get_drvdata(dev); u8 alarmvals[3]; int flagreg, err; err = regmap_bulk_read(rx8010->regs, RX8010_ALMIN, alarmvals, 3); if (err) return err; err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg); if (err) return err; t->time.tm_sec = 0; t->time.tm_min = bcd2bin(alarmvals[0] & 0x7f); t->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f); if (!(alarmvals[2] & RX8010_ALARM_AE)) t->time.tm_mday = bcd2bin(alarmvals[2] & 0x7f); t->enabled = !!(rx8010->ctrlreg & RX8010_CTRL_AIE); t->pending = (flagreg & RX8010_FLAG_AF) && t->enabled; return 0; } static int rx8010_set_alarm(struct device *dev, struct rtc_wkalrm *t) { struct rx8010_data *rx8010 = dev_get_drvdata(dev); u8 alarmvals[3]; int err; if (rx8010->ctrlreg & (RX8010_CTRL_AIE | RX8010_CTRL_UIE)) { rx8010->ctrlreg &= ~(RX8010_CTRL_AIE | RX8010_CTRL_UIE); err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg); if (err) return err; } err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_AF); if (err) return err; alarmvals[0] = bin2bcd(t->time.tm_min); alarmvals[1] = bin2bcd(t->time.tm_hour); alarmvals[2] = bin2bcd(t->time.tm_mday); err = regmap_bulk_write(rx8010->regs, RX8010_ALMIN, alarmvals, 2); if (err) return err; err = regmap_clear_bits(rx8010->regs, RX8010_EXT, RX8010_EXT_WADA); if (err) return err; if (alarmvals[2] == 0) alarmvals[2] |= RX8010_ALARM_AE; err = regmap_write(rx8010->regs, RX8010_ALWDAY, alarmvals[2]); if (err) return err; if (t->enabled) { if (rx8010->rtc->uie_rtctimer.enabled) rx8010->ctrlreg |= RX8010_CTRL_UIE; if (rx8010->rtc->aie_timer.enabled) rx8010->ctrlreg |= (RX8010_CTRL_AIE | RX8010_CTRL_UIE); err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg); if (err) return err; } return 0; } static int rx8010_alarm_irq_enable(struct device *dev, unsigned int enabled) { struct rx8010_data *rx8010 = dev_get_drvdata(dev); int err; u8 ctrl; ctrl = rx8010->ctrlreg; if (enabled) { if (rx8010->rtc->uie_rtctimer.enabled) ctrl |= RX8010_CTRL_UIE; if (rx8010->rtc->aie_timer.enabled) ctrl |= (RX8010_CTRL_AIE | RX8010_CTRL_UIE); } else { if (!rx8010->rtc->uie_rtctimer.enabled) ctrl &= ~RX8010_CTRL_UIE; if (!rx8010->rtc->aie_timer.enabled) ctrl &= ~RX8010_CTRL_AIE; } err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_AF); if (err) return err; if (ctrl != rx8010->ctrlreg) { rx8010->ctrlreg = ctrl; err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg); if (err) return err; } return 0; } static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) { struct rx8010_data *rx8010 = dev_get_drvdata(dev); int tmp, flagreg, err; switch (cmd) { case RTC_VL_READ: err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg); if (err) return err; tmp = flagreg & RX8010_FLAG_VLF ? RTC_VL_DATA_INVALID : 0; return put_user(tmp, (unsigned int __user *)arg); default: return -ENOIOCTLCMD; } } static const struct rtc_class_ops rx8010_rtc_ops = { .read_time = rx8010_get_time, .set_time = rx8010_set_time, .ioctl = rx8010_ioctl, .read_alarm = rx8010_read_alarm, .set_alarm = rx8010_set_alarm, .alarm_irq_enable = rx8010_alarm_irq_enable, }; static const struct regmap_config rx8010_regmap_config = { .name = "rx8010-rtc", .reg_bits = 8, .val_bits = 8, }; static int rx8010_probe(struct i2c_client *client) { struct device *dev = &client->dev; struct rx8010_data *rx8010; int err = 0; rx8010 = devm_kzalloc(dev, sizeof(*rx8010), GFP_KERNEL); if (!rx8010) return -ENOMEM; i2c_set_clientdata(client, rx8010); rx8010->regs = devm_regmap_init_i2c(client, &rx8010_regmap_config); if (IS_ERR(rx8010->regs)) return PTR_ERR(rx8010->regs); err = rx8010_init(dev); if (err) return err; rx8010->rtc = devm_rtc_allocate_device(dev); if (IS_ERR(rx8010->rtc)) return PTR_ERR(rx8010->rtc); if (client->irq > 0) { dev_info(dev, "IRQ %d supplied\n", client->irq); err = devm_request_threaded_irq(dev, client->irq, NULL, rx8010_irq_1_handler, IRQF_TRIGGER_LOW | IRQF_ONESHOT, "rx8010", client); if (err) { dev_err(dev, "unable to request IRQ\n"); return err; } } else { clear_bit(RTC_FEATURE_ALARM, rx8010->rtc->features); } rx8010->rtc->ops = &rx8010_rtc_ops; rx8010->rtc->max_user_freq = 1; rx8010->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; rx8010->rtc->range_max = RTC_TIMESTAMP_END_2099; return devm_rtc_register_device(rx8010->rtc); } static struct i2c_driver rx8010_driver = { .driver = { .name = "rtc-rx8010", .of_match_table = of_match_ptr(rx8010_of_match), }, .probe_new = rx8010_probe, .id_table = rx8010_id, }; module_i2c_driver(rx8010_driver); MODULE_AUTHOR("Akshay Bhat <akshay.bhat@timesys.com>"); MODULE_DESCRIPTION("Epson RX8010SJ RTC driver"); MODULE_LICENSE("GPL v2"); |