Akshay Bhat | ed13d89 | 2015-12-03 14:41:21 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Driver for the Epson RTC module RX-8010 SJ |
| 3 | * |
| 4 | * Copyright(C) Timesys Corporation 2015 |
| 5 | * Copyright(C) General Electric Company 2015 |
| 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 | |
| 13 | #include <linux/bcd.h> |
| 14 | #include <linux/bitops.h> |
| 15 | #include <linux/i2c.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/rtc.h> |
| 19 | |
| 20 | #define RX8010_SEC 0x10 |
| 21 | #define RX8010_MIN 0x11 |
| 22 | #define RX8010_HOUR 0x12 |
| 23 | #define RX8010_WDAY 0x13 |
| 24 | #define RX8010_MDAY 0x14 |
| 25 | #define RX8010_MONTH 0x15 |
| 26 | #define RX8010_YEAR 0x16 |
| 27 | #define RX8010_YEAR 0x16 |
| 28 | #define RX8010_RESV17 0x17 |
| 29 | #define RX8010_ALMIN 0x18 |
| 30 | #define RX8010_ALHOUR 0x19 |
| 31 | #define RX8010_ALWDAY 0x1A |
| 32 | #define RX8010_TCOUNT0 0x1B |
| 33 | #define RX8010_TCOUNT1 0x1C |
| 34 | #define RX8010_EXT 0x1D |
| 35 | #define RX8010_FLAG 0x1E |
| 36 | #define RX8010_CTRL 0x1F |
| 37 | /* 0x20 to 0x2F are user registers */ |
| 38 | #define RX8010_RESV30 0x30 |
| 39 | #define RX8010_RESV31 0x32 |
| 40 | #define RX8010_IRQ 0x32 |
| 41 | |
| 42 | #define RX8010_EXT_WADA BIT(3) |
| 43 | |
| 44 | #define RX8010_FLAG_VLF BIT(1) |
| 45 | #define RX8010_FLAG_AF BIT(3) |
| 46 | #define RX8010_FLAG_TF BIT(4) |
| 47 | #define RX8010_FLAG_UF BIT(5) |
| 48 | |
| 49 | #define RX8010_CTRL_AIE BIT(3) |
| 50 | #define RX8010_CTRL_UIE BIT(5) |
| 51 | #define RX8010_CTRL_STOP BIT(6) |
| 52 | #define RX8010_CTRL_TEST BIT(7) |
| 53 | |
| 54 | #define RX8010_ALARM_AE BIT(7) |
| 55 | |
| 56 | static const struct i2c_device_id rx8010_id[] = { |
| 57 | { "rx8010", 0 }, |
| 58 | { } |
| 59 | }; |
| 60 | MODULE_DEVICE_TABLE(i2c, rx8010_id); |
| 61 | |
| 62 | struct rx8010_data { |
| 63 | struct i2c_client *client; |
| 64 | struct rtc_device *rtc; |
| 65 | u8 ctrlreg; |
| 66 | spinlock_t flags_lock; |
| 67 | }; |
| 68 | |
| 69 | static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id) |
| 70 | { |
| 71 | struct i2c_client *client = dev_id; |
| 72 | struct rx8010_data *rx8010 = i2c_get_clientdata(client); |
| 73 | int flagreg; |
| 74 | |
| 75 | spin_lock(&rx8010->flags_lock); |
| 76 | |
| 77 | flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG); |
| 78 | |
| 79 | if (flagreg <= 0) { |
| 80 | spin_unlock(&rx8010->flags_lock); |
| 81 | return IRQ_NONE; |
| 82 | } |
| 83 | |
| 84 | if (flagreg & RX8010_FLAG_VLF) |
| 85 | dev_warn(&client->dev, "Frequency stop detected\n"); |
| 86 | |
| 87 | if (flagreg & RX8010_FLAG_TF) { |
| 88 | flagreg &= ~RX8010_FLAG_TF; |
| 89 | rtc_update_irq(rx8010->rtc, 1, RTC_PF | RTC_IRQF); |
| 90 | } |
| 91 | |
| 92 | if (flagreg & RX8010_FLAG_AF) { |
| 93 | flagreg &= ~RX8010_FLAG_AF; |
| 94 | rtc_update_irq(rx8010->rtc, 1, RTC_AF | RTC_IRQF); |
| 95 | } |
| 96 | |
| 97 | if (flagreg & RX8010_FLAG_UF) { |
| 98 | flagreg &= ~RX8010_FLAG_UF; |
| 99 | rtc_update_irq(rx8010->rtc, 1, RTC_UF | RTC_IRQF); |
| 100 | } |
| 101 | |
| 102 | i2c_smbus_write_byte_data(client, RX8010_FLAG, flagreg); |
| 103 | |
| 104 | spin_unlock(&rx8010->flags_lock); |
| 105 | return IRQ_HANDLED; |
| 106 | } |
| 107 | |
| 108 | static int rx8010_get_time(struct device *dev, struct rtc_time *dt) |
| 109 | { |
| 110 | struct rx8010_data *rx8010 = dev_get_drvdata(dev); |
| 111 | u8 date[7]; |
| 112 | int flagreg; |
| 113 | int err; |
| 114 | |
| 115 | flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG); |
| 116 | if (flagreg < 0) |
| 117 | return flagreg; |
| 118 | |
| 119 | if (flagreg & RX8010_FLAG_VLF) { |
| 120 | dev_warn(dev, "Frequency stop detected\n"); |
| 121 | return -EINVAL; |
| 122 | } |
| 123 | |
| 124 | err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_SEC, |
| 125 | 7, date); |
| 126 | if (err != 7) |
| 127 | return err < 0 ? err : -EIO; |
| 128 | |
| 129 | dt->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f); |
| 130 | dt->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f); |
| 131 | dt->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f); |
| 132 | dt->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f); |
| 133 | dt->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f) - 1; |
| 134 | dt->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 100; |
| 135 | dt->tm_wday = ffs(date[RX8010_WDAY - RX8010_SEC] & 0x7f); |
| 136 | |
| 137 | return rtc_valid_tm(dt); |
| 138 | } |
| 139 | |
| 140 | static int rx8010_set_time(struct device *dev, struct rtc_time *dt) |
| 141 | { |
| 142 | struct rx8010_data *rx8010 = dev_get_drvdata(dev); |
| 143 | u8 date[7]; |
| 144 | int ctrl, flagreg; |
| 145 | int ret; |
| 146 | unsigned long irqflags; |
| 147 | |
| 148 | if ((dt->tm_year < 100) || (dt->tm_year > 199)) |
| 149 | return -EINVAL; |
| 150 | |
| 151 | /* set STOP bit before changing clock/calendar */ |
| 152 | ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL); |
| 153 | if (ctrl < 0) |
| 154 | return ctrl; |
| 155 | rx8010->ctrlreg = ctrl | RX8010_CTRL_STOP; |
| 156 | ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL, |
| 157 | rx8010->ctrlreg); |
| 158 | if (ret < 0) |
| 159 | return ret; |
| 160 | |
| 161 | date[RX8010_SEC - RX8010_SEC] = bin2bcd(dt->tm_sec); |
| 162 | date[RX8010_MIN - RX8010_SEC] = bin2bcd(dt->tm_min); |
| 163 | date[RX8010_HOUR - RX8010_SEC] = bin2bcd(dt->tm_hour); |
| 164 | date[RX8010_MDAY - RX8010_SEC] = bin2bcd(dt->tm_mday); |
| 165 | date[RX8010_MONTH - RX8010_SEC] = bin2bcd(dt->tm_mon + 1); |
| 166 | date[RX8010_YEAR - RX8010_SEC] = bin2bcd(dt->tm_year - 100); |
| 167 | date[RX8010_WDAY - RX8010_SEC] = bin2bcd(1 << dt->tm_wday); |
| 168 | |
| 169 | ret = i2c_smbus_write_i2c_block_data(rx8010->client, |
| 170 | RX8010_SEC, 7, date); |
| 171 | if (ret < 0) |
| 172 | return ret; |
| 173 | |
| 174 | /* clear STOP bit after changing clock/calendar */ |
| 175 | ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL); |
| 176 | if (ctrl < 0) |
| 177 | return ctrl; |
| 178 | rx8010->ctrlreg = ctrl & ~RX8010_CTRL_STOP; |
| 179 | ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL, |
| 180 | rx8010->ctrlreg); |
| 181 | if (ret < 0) |
| 182 | return ret; |
| 183 | |
| 184 | spin_lock_irqsave(&rx8010->flags_lock, irqflags); |
| 185 | |
| 186 | flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG); |
| 187 | if (flagreg < 0) { |
| 188 | spin_unlock_irqrestore(&rx8010->flags_lock, irqflags); |
| 189 | return flagreg; |
| 190 | } |
| 191 | |
| 192 | if (flagreg & RX8010_FLAG_VLF) |
| 193 | ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, |
| 194 | flagreg & ~RX8010_FLAG_VLF); |
| 195 | |
| 196 | spin_unlock_irqrestore(&rx8010->flags_lock, irqflags); |
| 197 | |
| 198 | return 0; |
| 199 | } |
| 200 | |
| 201 | static int rx8010_init_client(struct i2c_client *client) |
| 202 | { |
| 203 | struct rx8010_data *rx8010 = i2c_get_clientdata(client); |
| 204 | u8 ctrl[2]; |
| 205 | int need_clear = 0, err = 0; |
| 206 | |
| 207 | /* Initialize reserved registers as specified in datasheet */ |
| 208 | err = i2c_smbus_write_byte_data(client, RX8010_RESV17, 0xD8); |
| 209 | if (err < 0) |
| 210 | return err; |
| 211 | |
| 212 | err = i2c_smbus_write_byte_data(client, RX8010_RESV30, 0x00); |
| 213 | if (err < 0) |
| 214 | return err; |
| 215 | |
| 216 | err = i2c_smbus_write_byte_data(client, RX8010_RESV31, 0x08); |
| 217 | if (err < 0) |
| 218 | return err; |
| 219 | |
| 220 | err = i2c_smbus_write_byte_data(client, RX8010_IRQ, 0x00); |
| 221 | if (err < 0) |
| 222 | return err; |
| 223 | |
| 224 | err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_FLAG, |
| 225 | 2, ctrl); |
| 226 | if (err != 2) |
| 227 | return err < 0 ? err : -EIO; |
| 228 | |
| 229 | if (ctrl[0] & RX8010_FLAG_VLF) |
| 230 | dev_warn(&client->dev, "Frequency stop was detected\n"); |
| 231 | |
| 232 | if (ctrl[0] & RX8010_FLAG_AF) { |
| 233 | dev_warn(&client->dev, "Alarm was detected\n"); |
| 234 | need_clear = 1; |
| 235 | } |
| 236 | |
| 237 | if (ctrl[0] & RX8010_FLAG_TF) |
| 238 | need_clear = 1; |
| 239 | |
| 240 | if (ctrl[0] & RX8010_FLAG_UF) |
| 241 | need_clear = 1; |
| 242 | |
| 243 | if (need_clear) { |
| 244 | ctrl[0] &= ~(RX8010_FLAG_AF | RX8010_FLAG_TF | RX8010_FLAG_UF); |
| 245 | err = i2c_smbus_write_byte_data(client, RX8010_FLAG, ctrl[0]); |
| 246 | if (err < 0) |
| 247 | return err; |
| 248 | } |
| 249 | |
| 250 | rx8010->ctrlreg = (ctrl[1] & ~RX8010_CTRL_TEST); |
| 251 | |
| 252 | return err; |
| 253 | } |
| 254 | |
| 255 | static int rx8010_read_alarm(struct device *dev, struct rtc_wkalrm *t) |
| 256 | { |
| 257 | struct rx8010_data *rx8010 = dev_get_drvdata(dev); |
| 258 | struct i2c_client *client = rx8010->client; |
| 259 | u8 alarmvals[3]; |
| 260 | int flagreg; |
| 261 | int err; |
| 262 | |
| 263 | err = i2c_smbus_read_i2c_block_data(client, RX8010_ALMIN, 3, alarmvals); |
| 264 | if (err != 3) |
| 265 | return err < 0 ? err : -EIO; |
| 266 | |
| 267 | flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG); |
| 268 | if (flagreg < 0) |
| 269 | return flagreg; |
| 270 | |
| 271 | t->time.tm_sec = 0; |
| 272 | t->time.tm_min = bcd2bin(alarmvals[0] & 0x7f); |
| 273 | t->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f); |
| 274 | |
| 275 | if (alarmvals[2] & RX8010_ALARM_AE) |
| 276 | t->time.tm_mday = -1; |
| 277 | else |
| 278 | t->time.tm_mday = bcd2bin(alarmvals[2] & 0x7f); |
| 279 | |
| 280 | t->time.tm_wday = -1; |
| 281 | t->time.tm_mon = -1; |
| 282 | t->time.tm_year = -1; |
| 283 | |
| 284 | t->enabled = !!(rx8010->ctrlreg & RX8010_CTRL_AIE); |
| 285 | t->pending = (flagreg & RX8010_FLAG_AF) && t->enabled; |
| 286 | |
| 287 | return err; |
| 288 | } |
| 289 | |
| 290 | static int rx8010_set_alarm(struct device *dev, struct rtc_wkalrm *t) |
| 291 | { |
| 292 | struct i2c_client *client = to_i2c_client(dev); |
| 293 | struct rx8010_data *rx8010 = dev_get_drvdata(dev); |
| 294 | u8 alarmvals[3]; |
| 295 | int extreg, flagreg; |
| 296 | int err; |
| 297 | unsigned long irqflags; |
| 298 | |
| 299 | spin_lock_irqsave(&rx8010->flags_lock, irqflags); |
| 300 | flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG); |
| 301 | if (flagreg < 0) { |
| 302 | spin_unlock_irqrestore(&rx8010->flags_lock, irqflags); |
| 303 | return flagreg; |
| 304 | } |
| 305 | |
| 306 | if (rx8010->ctrlreg & (RX8010_CTRL_AIE | RX8010_CTRL_UIE)) { |
| 307 | rx8010->ctrlreg &= ~(RX8010_CTRL_AIE | RX8010_CTRL_UIE); |
| 308 | err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL, |
| 309 | rx8010->ctrlreg); |
| 310 | if (err < 0) { |
| 311 | spin_unlock_irqrestore(&rx8010->flags_lock, irqflags); |
| 312 | return err; |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | flagreg &= ~RX8010_FLAG_AF; |
| 317 | err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg); |
| 318 | spin_unlock_irqrestore(&rx8010->flags_lock, irqflags); |
| 319 | if (err < 0) |
| 320 | return err; |
| 321 | |
| 322 | alarmvals[0] = bin2bcd(t->time.tm_min); |
| 323 | alarmvals[1] = bin2bcd(t->time.tm_hour); |
| 324 | alarmvals[2] = bin2bcd(t->time.tm_mday); |
| 325 | |
| 326 | err = i2c_smbus_write_i2c_block_data(rx8010->client, RX8010_ALMIN, |
| 327 | 2, alarmvals); |
| 328 | if (err < 0) |
| 329 | return err; |
| 330 | |
| 331 | extreg = i2c_smbus_read_byte_data(client, RX8010_EXT); |
| 332 | if (extreg < 0) |
| 333 | return extreg; |
| 334 | |
| 335 | extreg |= RX8010_EXT_WADA; |
| 336 | err = i2c_smbus_write_byte_data(rx8010->client, RX8010_EXT, extreg); |
| 337 | if (err < 0) |
| 338 | return err; |
| 339 | |
| 340 | if (alarmvals[2] == 0) |
| 341 | alarmvals[2] |= RX8010_ALARM_AE; |
| 342 | |
| 343 | err = i2c_smbus_write_byte_data(rx8010->client, RX8010_ALWDAY, |
| 344 | alarmvals[2]); |
| 345 | if (err < 0) |
| 346 | return err; |
| 347 | |
| 348 | if (t->enabled) { |
| 349 | if (rx8010->rtc->uie_rtctimer.enabled) |
| 350 | rx8010->ctrlreg |= RX8010_CTRL_UIE; |
| 351 | if (rx8010->rtc->aie_timer.enabled) |
| 352 | rx8010->ctrlreg |= |
| 353 | (RX8010_CTRL_AIE | RX8010_CTRL_UIE); |
| 354 | |
| 355 | err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL, |
| 356 | rx8010->ctrlreg); |
| 357 | if (err < 0) |
| 358 | return err; |
| 359 | } |
| 360 | |
| 361 | return 0; |
| 362 | } |
| 363 | |
| 364 | static int rx8010_alarm_irq_enable(struct device *dev, |
| 365 | unsigned int enabled) |
| 366 | { |
| 367 | struct i2c_client *client = to_i2c_client(dev); |
| 368 | struct rx8010_data *rx8010 = dev_get_drvdata(dev); |
| 369 | int flagreg; |
| 370 | u8 ctrl; |
| 371 | int err; |
| 372 | |
| 373 | ctrl = rx8010->ctrlreg; |
| 374 | |
| 375 | if (enabled) { |
| 376 | if (rx8010->rtc->uie_rtctimer.enabled) |
| 377 | ctrl |= RX8010_CTRL_UIE; |
| 378 | if (rx8010->rtc->aie_timer.enabled) |
| 379 | ctrl |= (RX8010_CTRL_AIE | RX8010_CTRL_UIE); |
| 380 | } else { |
| 381 | if (!rx8010->rtc->uie_rtctimer.enabled) |
| 382 | ctrl &= ~RX8010_CTRL_UIE; |
| 383 | if (!rx8010->rtc->aie_timer.enabled) |
| 384 | ctrl &= ~RX8010_CTRL_AIE; |
| 385 | } |
| 386 | |
| 387 | flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG); |
| 388 | if (flagreg < 0) |
| 389 | return flagreg; |
| 390 | |
| 391 | flagreg &= ~RX8010_FLAG_AF; |
| 392 | err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg); |
| 393 | if (err < 0) |
| 394 | return err; |
| 395 | |
| 396 | if (ctrl != rx8010->ctrlreg) { |
| 397 | rx8010->ctrlreg = ctrl; |
| 398 | err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL, |
| 399 | rx8010->ctrlreg); |
| 400 | if (err < 0) |
| 401 | return err; |
| 402 | } |
| 403 | |
| 404 | return 0; |
| 405 | } |
| 406 | |
| 407 | static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) |
| 408 | { |
| 409 | struct i2c_client *client = to_i2c_client(dev); |
| 410 | struct rx8010_data *rx8010 = dev_get_drvdata(dev); |
| 411 | int ret, tmp; |
| 412 | int flagreg; |
| 413 | unsigned long irqflags; |
| 414 | |
| 415 | switch (cmd) { |
| 416 | case RTC_VL_READ: |
| 417 | flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG); |
| 418 | if (flagreg < 0) |
| 419 | return flagreg; |
| 420 | |
| 421 | tmp = !!(flagreg & RX8010_FLAG_VLF); |
| 422 | if (copy_to_user((void __user *)arg, &tmp, sizeof(int))) |
| 423 | return -EFAULT; |
| 424 | |
| 425 | return 0; |
| 426 | |
| 427 | case RTC_VL_CLR: |
| 428 | spin_lock_irqsave(&rx8010->flags_lock, irqflags); |
| 429 | flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG); |
| 430 | if (flagreg < 0) { |
| 431 | spin_unlock_irqrestore(&rx8010->flags_lock, irqflags); |
| 432 | return flagreg; |
| 433 | } |
| 434 | |
| 435 | flagreg &= ~RX8010_FLAG_VLF; |
| 436 | ret = i2c_smbus_write_byte_data(client, RX8010_FLAG, flagreg); |
| 437 | spin_unlock_irqrestore(&rx8010->flags_lock, irqflags); |
| 438 | if (ret < 0) |
| 439 | return ret; |
| 440 | |
| 441 | return 0; |
| 442 | |
| 443 | default: |
| 444 | return -ENOIOCTLCMD; |
| 445 | } |
| 446 | } |
| 447 | |
| 448 | static struct rtc_class_ops rx8010_rtc_ops = { |
| 449 | .read_time = rx8010_get_time, |
| 450 | .set_time = rx8010_set_time, |
| 451 | .ioctl = rx8010_ioctl, |
| 452 | }; |
| 453 | |
| 454 | static int rx8010_probe(struct i2c_client *client, |
| 455 | const struct i2c_device_id *id) |
| 456 | { |
| 457 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); |
| 458 | struct rx8010_data *rx8010; |
| 459 | int err = 0; |
| 460 | |
| 461 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
| 462 | | I2C_FUNC_SMBUS_I2C_BLOCK)) { |
| 463 | dev_err(&adapter->dev, "doesn't support required functionality\n"); |
| 464 | return -EIO; |
| 465 | } |
| 466 | |
| 467 | rx8010 = devm_kzalloc(&client->dev, sizeof(struct rx8010_data), |
| 468 | GFP_KERNEL); |
| 469 | if (!rx8010) |
| 470 | return -ENOMEM; |
| 471 | |
| 472 | rx8010->client = client; |
| 473 | i2c_set_clientdata(client, rx8010); |
| 474 | |
| 475 | spin_lock_init(&rx8010->flags_lock); |
| 476 | |
| 477 | err = rx8010_init_client(client); |
| 478 | if (err) |
| 479 | return err; |
| 480 | |
| 481 | if (client->irq > 0) { |
| 482 | dev_info(&client->dev, "IRQ %d supplied\n", client->irq); |
| 483 | err = devm_request_threaded_irq(&client->dev, client->irq, NULL, |
| 484 | rx8010_irq_1_handler, |
| 485 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
| 486 | "rx8010", client); |
| 487 | |
| 488 | if (err) { |
| 489 | dev_err(&client->dev, "unable to request IRQ\n"); |
| 490 | client->irq = 0; |
| 491 | } else { |
| 492 | rx8010_rtc_ops.read_alarm = rx8010_read_alarm; |
| 493 | rx8010_rtc_ops.set_alarm = rx8010_set_alarm; |
| 494 | rx8010_rtc_ops.alarm_irq_enable = rx8010_alarm_irq_enable; |
| 495 | } |
| 496 | } |
| 497 | |
| 498 | rx8010->rtc = devm_rtc_device_register(&client->dev, client->name, |
| 499 | &rx8010_rtc_ops, THIS_MODULE); |
| 500 | |
| 501 | if (IS_ERR(rx8010->rtc)) { |
| 502 | dev_err(&client->dev, "unable to register the class device\n"); |
| 503 | return PTR_ERR(rx8010->rtc); |
| 504 | } |
| 505 | |
| 506 | rx8010->rtc->max_user_freq = 1; |
| 507 | |
| 508 | return err; |
| 509 | } |
| 510 | |
| 511 | static struct i2c_driver rx8010_driver = { |
| 512 | .driver = { |
| 513 | .name = "rtc-rx8010", |
| 514 | }, |
| 515 | .probe = rx8010_probe, |
| 516 | .id_table = rx8010_id, |
| 517 | }; |
| 518 | |
| 519 | module_i2c_driver(rx8010_driver); |
| 520 | |
| 521 | MODULE_AUTHOR("Akshay Bhat <akshay.bhat@timesys.com>"); |
| 522 | MODULE_DESCRIPTION("Epson RX8010SJ RTC driver"); |
| 523 | MODULE_LICENSE("GPL v2"); |